/* ==================================================================
 * ds-components.css — Deepege Design System Components
 * Built on design-token.css（tokens 先行引入）
 * 与 frontend/public/design-system.html 组件库预览内嵌副本保持同步
 * ================================================================== */

/* —— Base reset & body ———————————————————————————————————————— */
*, *::before, *::after { box-sizing: border-box; }

html {
  font-family: var(--ds-typeface-plain);
  font-size: 16px;
  line-height: 1.5;
  color: var(--ds-color-on-surface);
  background: var(--ds-color-surface);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--ds-color-surface);
  color: var(--ds-color-on-surface);
}

/* —— Utility ———————————————————————————————————————————————— */
.ds-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--ds-sys-space-xl) var(--ds-sys-space-lg);
}

.ds-section {
  margin-bottom: var(--ds-sys-space-xxxl);
}

.ds-section-title {
  font-family: var(--ds-font-headline-small-family);
  font-weight: var(--ds-font-headline-small-weight);
  font-size: var(--ds-font-headline-small-size);
  line-height: var(--ds-font-headline-small-line-height);
  letter-spacing: var(--ds-font-headline-small-tracking);
  color: var(--ds-color-on-surface);
  margin: 0 0 var(--ds-sys-space-lg);
  padding-bottom: var(--ds-sys-space-sm);
  border-bottom: 1px solid var(--ds-color-outline-variant);
}

.ds-subsection {
  margin-bottom: var(--ds-sys-space-xl);
}

.ds-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--ds-sys-space-md);
  align-items: flex-start;
}

.ds-row-center {
  align-items: center;
}

.ds-stack {
  display: flex;
  flex-direction: column;
  gap: var(--ds-sys-space-md);
}

.ds-label {
  font-family: var(--ds-font-label-medium-family);
  font-weight: var(--ds-font-label-medium-weight);
  font-size: var(--ds-font-label-medium-size);
  line-height: var(--ds-font-label-medium-line-height);
  letter-spacing: var(--ds-font-label-medium-tracking);
  color: var(--ds-color-on-surface-variant);
  margin-bottom: var(--ds-sys-space-xs);
  display: block;
}

/* —— Typography showcase helpers ———————————————————————————— */
.typo-display-large {
  font-family: var(--ds-font-display-large-family);
  font-weight: var(--ds-font-display-large-weight);
  font-size: var(--ds-font-display-large-size);
  line-height: var(--ds-font-display-large-line-height);
  letter-spacing: var(--ds-font-display-large-tracking);
}
.typo-display-medium {
  font-family: var(--ds-font-display-medium-family);
  font-weight: var(--ds-font-display-medium-weight);
  font-size: var(--ds-font-display-medium-size);
  line-height: var(--ds-font-display-medium-line-height);
  letter-spacing: var(--ds-font-display-medium-tracking);
}
.typo-display-small {
  font-family: var(--ds-font-display-small-family);
  font-weight: var(--ds-font-display-small-weight);
  font-size: var(--ds-font-display-small-size);
  line-height: var(--ds-font-display-small-line-height);
  letter-spacing: var(--ds-font-display-small-tracking);
}
.typo-headline-large {
  font-family: var(--ds-font-headline-large-family);
  font-weight: var(--ds-font-headline-large-weight);
  font-size: var(--ds-font-headline-large-size);
  line-height: var(--ds-font-headline-large-line-height);
  letter-spacing: var(--ds-font-headline-large-tracking);
}
.typo-headline-medium {
  font-family: var(--ds-font-headline-medium-family);
  font-weight: var(--ds-font-headline-medium-weight);
  font-size: var(--ds-font-headline-medium-size);
  line-height: var(--ds-font-headline-medium-line-height);
  letter-spacing: var(--ds-font-headline-medium-tracking);
}
.typo-headline-small {
  font-family: var(--ds-font-headline-small-family);
  font-weight: var(--ds-font-headline-small-weight);
  font-size: var(--ds-font-headline-small-size);
  line-height: var(--ds-font-headline-small-line-height);
  letter-spacing: var(--ds-font-headline-small-tracking);
}
.typo-title-large {
  font-family: var(--ds-font-title-large-family);
  font-weight: var(--ds-font-title-large-weight);
  font-size: var(--ds-font-title-large-size);
  line-height: var(--ds-font-title-large-line-height);
  letter-spacing: var(--ds-font-title-large-tracking);
}
.typo-title-medium {
  font-family: var(--ds-font-title-medium-family);
  font-weight: var(--ds-font-title-medium-weight);
  font-size: var(--ds-font-title-medium-size);
  line-height: var(--ds-font-title-medium-line-height);
  letter-spacing: var(--ds-font-title-medium-tracking);
}
.typo-title-small {
  font-family: var(--ds-font-title-small-family);
  font-weight: var(--ds-font-title-small-weight);
  font-size: var(--ds-font-title-small-size);
  line-height: var(--ds-font-title-small-line-height);
  letter-spacing: var(--ds-font-title-small-tracking);
}
.typo-body-large {
  font-family: var(--ds-font-body-large-family);
  font-weight: var(--ds-font-body-large-weight);
  font-size: var(--ds-font-body-large-size);
  line-height: var(--ds-font-body-large-line-height);
  letter-spacing: var(--ds-font-body-large-tracking);
}
.typo-body-medium {
  font-family: var(--ds-font-body-medium-family);
  font-weight: var(--ds-font-body-medium-weight);
  font-size: var(--ds-font-body-medium-size);
  line-height: var(--ds-font-body-medium-line-height);
  letter-spacing: var(--ds-font-body-medium-tracking);
}
.typo-body-small {
  font-family: var(--ds-font-body-small-family);
  font-weight: var(--ds-font-body-small-weight);
  font-size: var(--ds-font-body-small-size);
  line-height: var(--ds-font-body-small-line-height);
  letter-spacing: var(--ds-font-body-small-tracking);
}
.typo-label-large {
  font-family: var(--ds-font-label-large-family);
  font-weight: var(--ds-font-label-large-weight);
  font-size: var(--ds-font-label-large-size);
  line-height: var(--ds-font-label-large-line-height);
  letter-spacing: var(--ds-font-label-large-tracking);
}
.typo-label-medium {
  font-family: var(--ds-font-label-medium-family);
  font-weight: var(--ds-font-label-medium-weight);
  font-size: var(--ds-font-label-medium-size);
  line-height: var(--ds-font-label-medium-line-height);
  letter-spacing: var(--ds-font-label-medium-tracking);
}
.typo-label-small {
  font-family: var(--ds-font-label-small-family);
  font-weight: var(--ds-font-label-small-weight);
  font-size: var(--ds-font-label-small-size);
  line-height: var(--ds-font-label-small-line-height);
  letter-spacing: var(--ds-font-label-small-tracking);
}
.typo-code {
  font-family: var(--ds-font-code-medium-family);
  font-weight: var(--ds-font-code-medium-weight);
  font-size: var(--ds-font-code-medium-size);
  line-height: var(--ds-font-code-medium-line-height);
  letter-spacing: var(--ds-font-code-medium-tracking);
}

/* —— Color palette swatches ————————————————————————————————— */
.ds-palette {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: var(--ds-sys-space-md);
}

/* 整块色卡：背景 = 角色色，文字 = on-*（对照色） */
.ds-swatch {
  border-radius: var(--ds-corner-large);
  padding: var(--ds-sys-space-lg) var(--ds-sys-space-md);
  min-height: 88px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: var(--ds-sys-space-sm);
  box-shadow: var(--ds-elevation-soft);
  border: 1px solid var(--ds-color-outline-variant);
  transition: all var(--ds-motion-short-2) var(--ds-easing-standard);
}

.ds-swatch-name {
  font-family: var(--ds-font-title-small-family);
  font-weight: var(--ds-font-title-small-weight);
  font-size: var(--ds-font-title-small-size);
  line-height: 1.3;
  margin: 0;
  opacity: 0.95;
}

.ds-swatch-value {
  font-family: var(--ds-font-code-medium-family);
  font-size: var(--ds-font-body-small-size);
  margin: 0;
  opacity: 0.85;
}

/* 角色色卡：文字用对应 on-* token */
.ds-swatch--primary {
  background: var(--ds-color-primary);
  color: var(--ds-color-on-primary);
  border-color: color-mix(in srgb, var(--ds-color-outline) 80%, transparent);
}
.ds-swatch--primary-container {
  background: var(--ds-color-primary-container);
  color: var(--ds-color-on-primary-container);
  border-color: var(--ds-color-outline);
}
.ds-swatch--secondary {
  background: var(--ds-color-secondary);
  color: var(--ds-color-on-secondary);
}
.ds-swatch--secondary-container {
  background: var(--ds-color-secondary-container);
  color: var(--ds-color-on-secondary-container);
}
.ds-swatch--tertiary {
  background: var(--ds-color-tertiary);
  color: var(--ds-color-on-tertiary);
}
.ds-swatch--tertiary-container {
  background: var(--ds-color-tertiary-container);
  color: var(--ds-color-on-tertiary-container);
}
.ds-swatch--error {
  background: var(--ds-color-error);
  color: var(--ds-color-on-error);
}
.ds-swatch--error-container {
  background: var(--ds-color-error-container);
  color: var(--ds-color-on-error-container);
}
.ds-swatch--warning {
  background: var(--ds-color-warning);
  color: var(--ds-color-on-warning);
}
.ds-swatch--warning-container {
  background: var(--ds-color-warning-container);
  color: var(--ds-color-on-warning-container);
}
.ds-swatch--success {
  background: var(--ds-color-success);
  color: var(--ds-color-on-success);
}
.ds-swatch--success-container {
  background: var(--ds-color-success-container);
  color: var(--ds-color-on-success-container);
}
.ds-swatch--surface {
  background: var(--ds-color-surface);
  color: var(--ds-color-on-surface);
  border: 1px solid var(--ds-color-outline-variant);
}
.ds-swatch--surface-lowest {
  background: var(--ds-color-surface-container-lowest);
  color: var(--ds-color-on-surface);
  border: 1px solid var(--ds-color-outline-variant);
}
.ds-swatch--surface-low {
  background: var(--ds-color-surface-container-low);
  color: var(--ds-color-on-surface);
  border: 1px solid var(--ds-color-outline-variant);
}
.ds-swatch--surface-container {
  background: var(--ds-color-surface-container);
  color: var(--ds-color-on-surface);
  border: 1px solid var(--ds-color-outline-variant);
}
.ds-swatch--surface-high {
  background: var(--ds-color-surface-container-high);
  color: var(--ds-color-on-surface);
  border: 1px solid var(--ds-color-outline-variant);
}
.ds-swatch--surface-highest {
  background: var(--ds-color-surface-container-highest);
  color: var(--ds-color-on-surface);
  border: 1px solid var(--ds-color-outline-variant);
}
.ds-swatch--surface-dim {
  background: var(--ds-color-surface-dim);
  color: var(--ds-color-on-surface);
  border: 1px solid var(--ds-color-outline-variant);
}
.ds-swatch--surface-bright {
  background: var(--ds-color-surface-bright);
  color: var(--ds-color-on-surface);
  border: 1px solid var(--ds-color-outline-variant);
}
.ds-swatch--inverse-surface {
  background: var(--ds-color-inverse-surface);
  color: var(--ds-color-inverse-on-surface);
  border: 1px solid color-mix(in srgb, var(--ds-color-inverse-on-surface) 15%, transparent);
}
.ds-swatch--inverse-primary {
  background: var(--ds-color-inverse-primary);
  color: var(--ds-color-inverse-surface);
  border: 1px solid var(--ds-color-outline-variant);
}
.ds-swatch--surface-tint {
  background: var(--ds-color-surface-tint);
  color: var(--ds-color-on-primary);
}

/* —— Buttons ——————————————————————————————————————————————— */
.ds-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--ds-sys-space-xs);
  font-family: var(--ds-font-label-large-family);
  font-weight: var(--ds-font-label-large-weight);
  font-size: var(--ds-font-label-large-size);
  line-height: var(--ds-font-label-large-line-height);
  letter-spacing: -0.01em;
  border: 1px solid transparent;
  border-radius: var(--ds-corner-small);
  cursor: pointer;
  transition: all var(--ds-motion-short-3) var(--ds-easing-standard);
  white-space: nowrap;
  user-select: none;
  position: relative;
  outline: none;
}

.ds-btn:focus-visible {
  box-shadow: 0 0 0 2px var(--ds-color-surface), 0 0 0 4px var(--ds-color-primary) !important;
}

.ds-btn:active:not(:disabled) {
  transform: scale(0.982) translateY(0.5px);
}

.ds-btn:disabled,
.ds-btn[aria-disabled="true"] {
  opacity: 0.38;
  cursor: not-allowed;
  pointer-events: none;
}

/* Sizes */
.ds-btn--sm {
  height: 32px;
  padding: 0 var(--ds-sys-space-md);
  font-size: var(--ds-font-label-medium-size);
  border-radius: var(--ds-corner-extra-small);
}
.ds-btn--md {
  height: 40px;
  padding: 0 var(--ds-sys-space-lg);
}
.ds-btn--lg {
  height: 48px;
  padding: 0 var(--ds-sys-space-xl);
  font-size: 0.9375rem;
}

/* Variants — Primary (filled) */
.ds-btn--primary {
  background: var(--ds-color-primary);
  color: var(--ds-color-on-primary);
  box-shadow: 0 1px 2px 0 rgba(15, 23, 42, 0.12);
}
.ds-btn--primary:hover:not(:disabled) {
  filter: brightness(1.06);
  box-shadow: 0 2px 6px -1px rgba(15, 23, 42, 0.18);
}
.ds-btn--primary:active:not(:disabled) {
  filter: brightness(0.96);
  box-shadow: none;
}

/* Secondary (tonal) */
.ds-btn--secondary {
  background: var(--ds-color-secondary-container);
  color: var(--ds-color-on-secondary-container);
}
.ds-btn--secondary:hover:not(:disabled) {
  background: color-mix(in srgb, var(--ds-color-secondary-container) 88%, var(--ds-color-on-secondary-container));
}
.ds-btn--secondary:active:not(:disabled) {
  background: color-mix(in srgb, var(--ds-color-secondary-container) 80%, var(--ds-color-on-secondary-container));
}

/* Tertiary / Outline */
.ds-btn--outline {
  background: transparent;
  color: var(--ds-color-primary);
  border: 1px solid var(--ds-color-outline);
}
.ds-btn--outline:hover:not(:disabled) {
  background: color-mix(in srgb, var(--ds-color-primary) 8%, transparent);
  border-color: var(--ds-color-primary);
}
.ds-btn--outline:active:not(:disabled) {
  background: color-mix(in srgb, var(--ds-color-primary) 12%, transparent);
}

/* Ghost / Text */
.ds-btn--ghost {
  background: transparent;
  color: var(--ds-color-primary);
}
.ds-btn--ghost:hover:not(:disabled) {
  background: color-mix(in srgb, var(--ds-color-primary) 8%, transparent);
}
.ds-btn--ghost:active:not(:disabled) {
  background: color-mix(in srgb, var(--ds-color-primary) 12%, transparent);
}

/* Warning */
.ds-btn--warning {
  background: transparent;
  color: var(--ds-color-warning);
}
.ds-btn--warning:hover:not(:disabled) {
  background: color-mix(in srgb, var(--ds-color-warning) 8%, transparent);
}
.ds-btn--warning:active:not(:disabled) {
  background: color-mix(in srgb, var(--ds-color-warning) 12%, transparent);
}

/* Danger ghost */
.ds-btn--danger-ghost {
  background: transparent;
  color: var(--ds-color-error);
}
.ds-btn--danger-ghost:hover:not(:disabled) {
  background: color-mix(in srgb, var(--ds-color-error) 8%, transparent);
}
.ds-btn--danger-ghost:active:not(:disabled) {
  background: color-mix(in srgb, var(--ds-color-error) 12%, transparent);
}

/* Danger */
.ds-btn--danger {
  background: var(--ds-color-error);
  color: var(--ds-color-on-error);
}
.ds-btn--danger:hover:not(:disabled) {
  background: color-mix(in srgb, var(--ds-color-error) 88%, black);
}
.ds-btn--danger:active:not(:disabled) {
  background: color-mix(in srgb, var(--ds-color-error) 78%, black);
}

/* Icon only */
.ds-btn--icon {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: var(--ds-corner-full);
}
.ds-btn--icon.ds-btn--sm {
  width: 32px;
  height: 32px;
}
.ds-btn--icon.ds-btn--lg {
  width: 48px;
  height: 48px;
}

/* —— Form fields (Input, Textarea, Search) —————————————————— */
.ds-field {
  display: flex;
  flex-direction: column;
  gap: var(--ds-sys-space-xs);
  width: 100%;
  max-width: 360px;
}

.ds-field-label {
  font-family: var(--ds-font-label-large-family);
  font-weight: var(--ds-font-label-large-weight);
  font-size: var(--ds-font-label-large-size);
  line-height: var(--ds-font-label-large-line-height);
  letter-spacing: var(--ds-font-label-large-tracking);
  color: var(--ds-color-on-surface);
}

.ds-field-hint {
  font-family: var(--ds-font-body-small-family);
  font-size: var(--ds-font-body-small-size);
  color: var(--ds-color-on-surface-variant);
}

.ds-field-error {
  font-family: var(--ds-font-body-small-family);
  font-size: var(--ds-font-body-small-size);
  color: var(--ds-color-error);
}

.ds-input,
.ds-textarea,
.ds-select {
  width: 100%;
  font-family: var(--ds-font-body-large-family);
  font-weight: var(--ds-font-body-large-weight);
  font-size: var(--ds-font-body-large-size);
  line-height: var(--ds-font-body-large-line-height);
  letter-spacing: var(--ds-font-body-large-tracking);
  color: var(--ds-color-on-surface);
  background: var(--ds-color-surface-container-lowest);
  border: 1px solid var(--ds-color-outline);
  border-radius: var(--ds-corner-small);
  padding: 0 var(--ds-sys-space-md);
  height: 40px;
  transition: all var(--ds-motion-short-3) var(--ds-easing-standard);
  outline: none;
  appearance: none;
  -webkit-appearance: none;
}

.ds-select option {
  background-color: var(--ds-color-surface-container-lowest);
  color: var(--ds-color-on-surface);
  padding: 8px 12px;
}

.ds-select option:checked,
.ds-select option:hover {
  background-color: var(--ds-color-primary-container);
  color: var(--ds-color-on-primary-container);
}

.ds-input::placeholder,
.ds-textarea::placeholder {
  color: var(--ds-color-on-surface-variant);
  opacity: 0.65;
}

.ds-input:hover:not(:disabled):not(:focus),
.ds-textarea:hover:not(:disabled):not(:focus),
.ds-select:hover:not(:disabled):not(:focus) {
  border-color: color-mix(in srgb, var(--ds-color-outline) 70%, var(--ds-color-on-surface));
}

.ds-input:focus,
.ds-textarea:focus,
.ds-select:focus {
  border-color: var(--ds-color-primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--ds-color-primary) 16%, transparent);
}

.ds-input:disabled,
.ds-textarea:disabled,
.ds-select:disabled {
  background: var(--ds-color-surface-container-low);
  color: var(--ds-color-on-surface-variant);
  cursor: not-allowed;
  opacity: 0.7;
}

.ds-input--error,
.ds-textarea--error,
.ds-select--error {
  border-color: var(--ds-color-error);
}
.ds-input--error:focus,
.ds-textarea--error:focus,
.ds-select--error:focus {
  border-color: var(--ds-color-error);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--ds-color-error) 20%, transparent);
}

.ds-textarea {
  height: auto;
  min-height: 96px;
  padding: var(--ds-sys-space-md);
  resize: vertical;
}

/* Search box */
.ds-search {
  position: relative;
  width: 100%;
  max-width: 360px;
}

.ds-search .ds-input {
  padding-left: 40px;
}

.ds-search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  color: var(--ds-color-on-surface-variant);
  pointer-events: none;
}

.ds-search .ds-input:focus + .ds-search-icon,
.ds-search:focus-within .ds-search-icon {
  color: var(--ds-color-primary);
}

/* Select / Dropdown */
.ds-select-wrap {
  position: relative;
  width: 100%;
  max-width: 360px;
}

.ds-select {
  padding-right: 36px;
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236e6e73' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
}

.ds-select:focus {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%230a5c99' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
}

/* Custom dropdown (for richer UI) */
.ds-dropdown {
  position: relative;
  display: inline-block;
  width: 100%;
  max-width: 280px;
}

.ds-dropdown-trigger {
  width: 100%;
  height: 40px;
  padding: 0 var(--ds-sys-space-md);
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--ds-sys-space-sm);
  font-family: var(--ds-font-body-large-family);
  font-weight: var(--ds-font-body-large-weight);
  font-size: var(--ds-font-body-large-size);
  line-height: var(--ds-font-body-large-line-height);
  color: var(--ds-color-on-surface);
  background: var(--ds-color-surface-container-lowest);
  border: 1px solid var(--ds-color-outline);
  border-radius: var(--ds-corner-small);
  cursor: pointer;
  transition: all var(--ds-motion-short-3) var(--ds-easing-standard);
  outline: none;
}

.ds-dropdown-trigger:hover {
  border-color: color-mix(in srgb, var(--ds-color-outline) 70%, var(--ds-color-on-surface));
}

.ds-dropdown-trigger:focus-visible,
.ds-dropdown.open .ds-dropdown-trigger {
  border-color: var(--ds-color-primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--ds-color-primary) 16%, transparent);
}

.ds-dropdown-trigger .ds-dropdown-placeholder {
  color: var(--ds-color-on-surface-variant);
}

.ds-dropdown-trigger svg {
  flex-shrink: 0;
  color: var(--ds-color-on-surface-variant);
}

.ds-dropdown-menu {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  z-index: 50;
  background: var(--ds-color-surface-container-lowest);
  border: 1px solid var(--ds-color-outline-variant);
  border-radius: var(--ds-corner-medium);
  box-shadow: var(--ds-elevation-soft), var(--ds-elevation-2);
  padding: var(--ds-sys-space-xs);
  max-height: 240px;
  overflow-y: auto;
  display: none;
}

.ds-dropdown.open .ds-dropdown-menu {
  display: block;
  animation: ds-fade-in var(--ds-motion-short-4) var(--ds-easing-decelerate);
}

.ds-dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--ds-sys-space-sm);
  padding: var(--ds-sys-space-sm) var(--ds-sys-space-md);
  border-radius: var(--ds-corner-extra-small);
  font-family: var(--ds-font-body-medium-family);
  font-size: var(--ds-font-body-medium-size);
  color: var(--ds-color-on-surface);
  cursor: pointer;
  transition: background-color var(--ds-motion-short-2) var(--ds-easing-standard);
}

.ds-dropdown-item:hover {
  background: var(--ds-color-surface-container-low);
  color: var(--ds-color-on-surface);
}

.ds-dropdown-item[aria-selected="true"] {
  background: var(--ds-color-primary-container);
  color: var(--ds-color-on-primary-container);
}

.ds-dropdown-item:active {
  background: color-mix(in srgb, var(--ds-color-surface-container) 70%, var(--ds-color-primary-container));
}

.ds-menu-hint {
  margin-left: auto;
  padding-left: var(--ds-sys-space-md);
  font-family: var(--ds-font-body-small-family);
  font-size: var(--ds-font-body-small-size);
  color: var(--ds-color-on-surface-variant);
}

.ds-menu--anchor-right {
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  z-index: 50;
}

/* —— Cards ————————————————————————————————————————————————— */
.ds-card {
  background: var(--ds-color-surface-container-lowest);
  border: 1px solid var(--ds-color-outline-variant);
  border-radius: var(--ds-corner-medium);
  box-shadow: var(--ds-elevation-soft);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: all var(--ds-motion-medium-1) var(--ds-easing-standard);
  position: relative;
}

.ds-card:hover {
  box-shadow: var(--ds-elevation-1);
  border-color: color-mix(in srgb, var(--ds-color-outline) 80%, var(--ds-color-primary));
}

.ds-card--elevated {
  box-shadow: var(--ds-elevation-2);
  border-color: var(--ds-color-outline-variant);
}

.ds-card--elevated:hover {
  box-shadow: var(--ds-elevation-3);
  border-color: color-mix(in srgb, var(--ds-color-outline) 80%, var(--ds-color-primary));
}

.ds-card--error {
  border-color: var(--ds-color-error);
}

.ds-card--dashed {
  border-style: dashed;
  background: transparent;
  box-shadow: none;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--ds-sys-space-sm);
  width: 100%;
  height: 100%;
  min-height: 200px;
  text-align: center;
}

.ds-card--dashed:hover {
  border-color: var(--ds-color-primary);
  box-shadow: none;
}

.ds-card--disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.ds-card--disabled:hover {
  box-shadow: none;
}

.ds-panel {
  border: 1px solid var(--ds-color-outline-variant);
  border-radius: var(--ds-corner-large);
  background: var(--ds-color-surface);
}

.ds-card-header {
  padding: var(--ds-sys-space-lg) var(--ds-sys-space-lg) var(--ds-sys-space-sm);
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--ds-sys-space-md);
}

.ds-card-title {
  font-family: var(--ds-font-title-medium-family);
  font-weight: var(--ds-font-title-medium-weight);
  font-size: var(--ds-font-title-medium-size);
  line-height: var(--ds-font-title-medium-line-height);
  letter-spacing: var(--ds-font-title-medium-tracking);
  color: var(--ds-color-on-surface);
  margin: 0;
}

.ds-card-subtitle {
  font-family: var(--ds-font-body-medium-family);
  font-size: var(--ds-font-body-medium-size);
  color: var(--ds-color-on-surface-variant);
  margin: 4px 0 0;
}

/* —— 平台豆腐块（授权选择 / 矩阵卡共用的平台 tile）———————————— */
.ds-platform-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--ds-sys-space-md);
  margin-top: var(--ds-sys-space-lg);
}

@media (max-width: 1199px) {
  .ds-platform-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 575px) {
  .ds-platform-grid { grid-template-columns: repeat(1, minmax(0, 1fr)); }
}

.ds-platform-tile {
  min-height: 150px;
  display: grid;
  grid-template-rows: 34px auto 30px;
  align-items: center;
  justify-items: start;
  gap: var(--ds-sys-space-sm);
  padding: var(--ds-sys-space-md);
  border: 1px solid var(--ds-color-outline-variant);
  border-radius: var(--ds-corner-medium);
  background: var(--ds-color-surface-container);
  color: var(--ds-color-on-surface);
  cursor: pointer;
  text-align: left;
  font-family: inherit;
  transition: all var(--ds-motion-short-3) var(--ds-easing-standard);
}

.ds-platform-tile-head {
  display: flex;
  align-items: center;
  gap: var(--ds-sys-space-sm);
  min-width: 0;
  width: 100%;
  justify-self: stretch;
}

.ds-platform-tile:hover:not(:disabled) {
  border-color: var(--ds-color-on-surface);
  background: var(--ds-color-surface-container-high);
}

.ds-platform-tile:disabled {
  cursor: not-allowed;
  color: var(--ds-color-on-surface-variant);
  background: var(--ds-color-surface-container);
  border-color: var(--ds-color-on-surface-variant);
}

.ds-platform-tile-logo {
  width: 34px;
  height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--ds-corner-small);
  overflow: hidden;
}

.ds-platform-tile-logo img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.ds-platform-tile-name {
  flex: 1;
  min-width: 0;
  font-family: var(--ds-font-title-small-family);
  font-weight: var(--ds-font-title-small-weight);
  font-size: var(--ds-font-title-small-size);
  color: var(--ds-color-on-surface);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.ds-platform-tile-status {
  font-family: var(--ds-font-body-small-family);
  font-size: var(--ds-font-body-small-size);
  color: var(--ds-color-on-surface-variant);
}

.ds-platform-tile-action {
  font-family: var(--ds-font-body-small-family);
  font-size: var(--ds-font-body-small-size);
  font-weight: 500;
  color: var(--ds-color-primary);
}

.ds-card-body {
  padding: var(--ds-sys-space-sm) var(--ds-sys-space-lg) var(--ds-sys-space-lg);
  font-family: var(--ds-font-body-medium-family);
  font-size: var(--ds-font-body-medium-size);
  line-height: var(--ds-font-body-medium-line-height);
  color: var(--ds-color-on-surface-variant);
}

.ds-card-footer {
  margin-top: auto;
  padding: var(--ds-sys-space-md) var(--ds-sys-space-lg);
  border-top: 1px solid var(--ds-color-outline-variant);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--ds-sys-space-sm);
  background: var(--ds-color-surface-container-low);
}

.ds-card-stats {
  display: flex;
  gap: var(--ds-sys-space-xl);
}

.ds-card-stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.ds-card-stat-label {
  font-family: var(--ds-font-body-small-family);
  font-size: var(--ds-font-body-small-size);
  color: var(--ds-color-on-surface-variant);
}

.ds-card-stat-value {
  font-family: var(--ds-typeface-code);
  font-size: var(--ds-font-title-large-size);
  font-weight: var(--ds-font-title-medium-weight);
  color: var(--ds-color-on-surface);
  font-variant-numeric: tabular-nums;
}

.ds-card-media {
  width: 100%;
  height: 160px;
  object-fit: cover;
  background: var(--ds-color-surface-container);
}

/* —— Badges / Chips / Tags —————————————————————————————————— */
.ds-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  height: 22px;
  padding: 0 8px;
  border-radius: var(--ds-corner-full);
  font-family: var(--ds-font-label-small-family);
  font-weight: var(--ds-font-label-small-weight);
  font-size: var(--ds-font-label-small-size);
  line-height: 1;
  letter-spacing: var(--ds-font-label-small-tracking);
}

.ds-badge--primary {
  background: var(--ds-color-primary-container);
  color: var(--ds-color-on-primary-container);
}
.ds-badge--info {
  background: var(--ds-color-info-container);
  color: var(--ds-color-on-info-container);
}
.ds-badge--secondary {
  background: var(--ds-color-secondary-container);
  color: var(--ds-color-on-secondary-container);
}
.ds-badge--tertiary {
  background: var(--ds-color-tertiary-container);
  color: var(--ds-color-on-tertiary-container);
}
.ds-badge--error {
  background: var(--ds-color-error-container);
  color: var(--ds-color-on-error-container);
}
.ds-badge--warning {
  background: var(--ds-color-warning-container);
  color: var(--ds-color-on-warning-container);
}
.ds-badge--success {
  background: var(--ds-color-success-container);
  color: var(--ds-color-on-success-container);
}

.ds-badge--outline {
  background: transparent;
  border: 1px solid var(--ds-color-outline);
  color: var(--ds-color-on-surface-variant);
}

.ds-badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  flex-shrink: 0;
  background: var(--ds-color-on-surface-variant);
}
.ds-badge-dot--info { background: var(--ds-color-info); }
.ds-badge-dot--success { background: var(--ds-color-success); }
.ds-badge-dot--error { background: var(--ds-color-error); }
.ds-badge-dot--warning { background: var(--ds-color-warning); }
.ds-badge-dot--primary { background: var(--ds-color-primary); }
.ds-badge-dot--neutral { background: var(--ds-color-on-surface-variant); }

.ds-badge--rank {
  width: 24px;
  height: 24px;
  padding: 0;
  justify-content: center;
  border-radius: var(--ds-corner-full);
  font-family: var(--ds-font-label-medium-family);
  font-weight: 600;
  font-size: var(--ds-font-label-medium-size);
  letter-spacing: 0;
}
.ds-badge--rank-1,
.ds-badge--rank-2,
.ds-badge--rank-3 {
  background: var(--ds-color-primary);
  color: var(--ds-color-on-primary);
}
.ds-badge--rank-n {
  background: var(--ds-color-surface-container-high);
  color: var(--ds-color-on-surface-variant);
  font-weight: 500;
}
.ds-badge--rank-label {
  height: 22px;
  padding: 0 10px;
  border-radius: var(--ds-corner-full);
  font-weight: 500;
}
.ds-badge--rank-label.is-1,
.ds-badge--rank-label.is-2,
.ds-badge--rank-label.is-3 {
  background: var(--ds-color-primary-container);
  color: var(--ds-color-on-primary-container);
}

/* —— Alerts / Banners —————————————————————————————————————— */
.ds-alert {
  display: flex;
  align-items: center;
  gap: var(--ds-sys-space-md);
  padding: var(--ds-sys-space-md) var(--ds-sys-space-lg);
  border-radius: var(--ds-corner-medium);
  border: 1px solid transparent;
  font-family: var(--ds-font-body-medium-family);
  font-size: var(--ds-font-body-medium-size);
  line-height: var(--ds-font-body-medium-line-height);
}

.ds-alert-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.ds-alert--info {
  background: var(--ds-color-info-container);
  color: var(--ds-color-on-info-container);
  border-color: color-mix(in srgb, var(--ds-color-info) 25%, transparent);
}
.ds-alert--success {
  background: var(--ds-color-success-container);
  color: var(--ds-color-on-success-container);
  border-color: color-mix(in srgb, var(--ds-color-success) 25%, transparent);
}
.ds-alert--warning {
  background: var(--ds-color-warning-container);
  color: var(--ds-color-on-warning-container);
  border-color: color-mix(in srgb, var(--ds-color-warning) 25%, transparent);
}
.ds-alert--error {
  background: var(--ds-color-error-container);
  color: var(--ds-color-on-error-container);
  border-color: color-mix(in srgb, var(--ds-color-error) 25%, transparent);
}

/* —— Checkbox / Radio / Switch ————————————————————————————— */
.ds-check,
.ds-radio {
  display: inline-flex;
  align-items: center;
  gap: var(--ds-sys-space-sm);
  font-family: var(--ds-font-body-medium-family);
  font-size: var(--ds-font-body-medium-size);
  color: var(--ds-color-on-surface);
  cursor: pointer;
  user-select: none;
}

.ds-check input,
.ds-radio input {
  appearance: none;
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border: 2px solid var(--ds-color-outline);
  border-radius: var(--ds-corner-extra-small);
  background: var(--ds-color-surface-container-lowest);
  cursor: pointer;
  transition: all var(--ds-motion-short-3) var(--ds-easing-standard);
  position: relative;
  flex-shrink: 0;
}

.ds-radio input {
  border-radius: var(--ds-corner-full);
}

.ds-check input:checked,
.ds-radio input:checked {
  background: var(--ds-color-primary);
  border-color: var(--ds-color-primary);
}

.ds-check input:checked::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 2px;
  width: 4px;
  height: 8px;
  border: solid var(--ds-color-on-primary);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.ds-radio input:checked::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 4px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ds-color-on-primary);
}

.ds-check input:focus-visible,
.ds-radio input:focus-visible {
  outline: 2px solid var(--ds-color-primary);
  outline-offset: 2px;
}

/* Switch */
.ds-switch {
  display: inline-flex;
  align-items: center;
  gap: var(--ds-sys-space-sm);
  cursor: pointer;
  user-select: none;
}

.ds-switch input {
  appearance: none;
  -webkit-appearance: none;
  width: 40px;
  height: 24px;
  border-radius: var(--ds-corner-full);
  background: var(--ds-color-surface-variant);
  border: 1px solid var(--ds-color-outline-variant);
  position: relative;
  cursor: pointer;
  transition: background var(--ds-motion-short-4) var(--ds-easing-standard),
              border-color var(--ds-motion-short-4) var(--ds-easing-standard);
}

.ds-switch input::after {
  content: "";
  position: absolute;
  top: 1px;
  left: 1px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: hsl(var(--color-white));
  box-shadow: 0 1px 3px rgba(0,0,0,0.25);
  transition: transform var(--ds-motion-short-4) var(--ds-easing-emphasized),
              background-color var(--ds-motion-short-4) var(--ds-easing-standard);
}

.ds-switch input:checked {
  background: var(--ds-color-primary);
  border-color: var(--ds-color-primary);
}
.ds-switch input:checked::after {
  transform: translateX(16px);
  background: var(--ds-color-on-primary);
}

.ds-switch input:focus-visible {
  outline: 2px solid var(--ds-color-primary);
  outline-offset: 2px;
}

/* —— Tabs ——————————————————————————————————————————————————— */
.ds-tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--ds-color-outline-variant);
}

.ds-tab {
  font-family: var(--ds-font-label-large-family);
  font-weight: var(--ds-font-label-large-weight);
  font-size: var(--ds-font-label-large-size);
  letter-spacing: var(--ds-font-label-large-tracking);
  color: var(--ds-color-on-surface-variant);
  background: transparent;
  border: none;
  padding: var(--ds-sys-space-md) var(--ds-sys-space-lg);
  cursor: pointer;
  position: relative;
  transition: color var(--ds-motion-short-3) var(--ds-easing-standard);
}

.ds-tab:hover {
  color: var(--ds-color-on-surface);
}

.ds-tab[aria-selected="true"] {
  color: var(--ds-color-primary);
}

.ds-tab[aria-selected="true"]::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: var(--ds-color-primary);
  border-radius: 2px 2px 0 0;
}

/* —— Table (simple SaaS style) ————————————————————————————— */
.ds-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--ds-color-outline-variant);
  border-radius: var(--ds-corner-medium);
  background: var(--ds-color-surface-container-lowest);
}

.ds-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--ds-font-body-medium-family);
  font-size: var(--ds-font-body-medium-size);
}

.ds-table th {
  text-align: left;
  padding: var(--ds-sys-space-md) var(--ds-sys-space-lg);
  font-family: var(--ds-font-label-medium-family);
  font-weight: 500;
  font-size: var(--ds-font-label-medium-size);
  letter-spacing: var(--ds-font-label-medium-tracking);
  color: var(--ds-color-on-surface-variant);
  background: var(--ds-color-surface-container-low);
  border-bottom: 1px solid var(--ds-color-outline-variant);
}

.ds-table td {
  padding: var(--ds-sys-space-md) var(--ds-sys-space-lg);
  border-bottom: 1px solid var(--ds-color-outline-variant);
  color: var(--ds-color-on-surface);
}

.ds-table tr:last-child td {
  border-bottom: none;
}

.ds-table tbody tr:nth-child(even) td {
  background: var(--ds-color-surface-container-low);
}

.ds-table tbody tr:hover td {
  background: var(--ds-color-surface-container);
}

/* —— Avatar ———————————————————————————————————————————————— */
.ds-avatar {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--ds-corner-full);
  background: var(--ds-color-primary-container);
  color: var(--ds-color-on-primary-container);
  font-family: var(--ds-font-label-large-family);
  font-weight: 500;
  font-size: var(--ds-font-label-large-size);
  overflow: hidden;
  flex-shrink: 0;
}

.ds-avatar--sm { width: 28px; height: 28px; font-size: 11px; }
.ds-avatar--lg { width: 56px; height: 56px; font-size: 1.125rem; }

.ds-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* —— Divider ——————————————————————————————————————————————— */
.ds-divider {
  height: 1px;
  background: var(--ds-color-outline-variant);
  border: none;
  margin: var(--ds-sys-space-lg) 0;
}

/* —— Tooltip (simple) —————————————————————————————————————— */
.ds-tooltip {
  position: relative;
  display: inline-flex;
}

.ds-tooltip-content {
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--ds-color-inverse-surface);
  color: var(--ds-color-inverse-on-surface);
  border: 1px solid color-mix(in srgb, var(--ds-color-inverse-on-surface) 10%, transparent);
  box-shadow: var(--ds-elevation-soft), 0 4px 12px var(--ds-color-scrim);
  font-family: var(--ds-font-label-medium-family);
  font-size: var(--ds-font-label-medium-size);
  padding: 6px 10px;
  border-radius: var(--ds-corner-extra-small);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--ds-motion-short-3) var(--ds-easing-standard);
  z-index: 100;
}

.ds-tooltip:hover .ds-tooltip-content {
  opacity: 1;
}

/* —— Modal / Dialog shell —————————————————————————————————— */
.ds-modal-backdrop {
  position: fixed;
  inset: 0;
  background: var(--ds-color-scrim);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--ds-motion-medium-1) var(--ds-easing-standard);
}

.ds-modal-backdrop.open {
  opacity: 1;
  visibility: visible;
}

.ds-modal {
  background: var(--ds-color-surface-container-lowest);
  border: 1px solid var(--ds-color-outline-variant);
  border-radius: var(--ds-corner-large);
  box-shadow: var(--ds-elevation-soft), var(--ds-elevation-4);
  width: max-content;
  max-width: 90vw;
  max-height: 90vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transform: scale(0.96);
  transition: transform var(--ds-motion-medium-1) var(--ds-easing-emphasized);
}

.ds-modal--wide {
  max-width: 768px;
}

.ds-modal-backdrop.open .ds-modal {
  transform: scale(1);
}

.ds-modal-header {
  padding: var(--ds-sys-space-lg) var(--ds-sys-space-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--ds-color-surface-container-lowest);
}

.ds-modal-title {
  font-family: var(--ds-font-title-large-family);
  font-weight: var(--ds-font-title-large-weight);
  font-size: var(--ds-font-title-large-size);
  color: var(--ds-color-on-surface);
  margin: 0;
}

.ds-modal-body {
  display: flex;
  flex-direction: column;
  gap: var(--ds-sys-space-md);
  padding: var(--ds-sys-space-xl);
  overflow-y: auto;
  font-family: var(--ds-font-body-medium-family);
  font-size: var(--ds-font-body-medium-size);
  line-height: var(--ds-font-body-medium-line-height);
  color: var(--ds-color-on-surface-variant);
  background: var(--ds-color-surface-container-lowest);
}
.ds-modal-copy {
  margin: 0;
  font: inherit;
  color: inherit;
}

.ds-modal-footer {
  padding: var(--ds-sys-space-md) var(--ds-sys-space-xl);
  border-top: 1px solid var(--ds-color-outline-variant);
  display: flex;
  justify-content: flex-end;
  gap: var(--ds-sys-space-sm);
  background: var(--ds-color-surface-container-lowest);
}

/* —— Skeleton loading —————————————————————————————————————— */
.ds-skeleton {
  background: linear-gradient(
    90deg,
    var(--ds-color-surface-container) 25%,
    var(--ds-color-surface-container-high) 50%,
    var(--ds-color-surface-container) 75%
  );
  background-size: 200% 100%;
  animation: ds-skeleton-shine 1.4s ease infinite;
  border-radius: var(--ds-corner-extra-small);
}

@keyframes ds-skeleton-shine {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

@keyframes ds-fade-in {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* —— Link (经典高辨识度无障碍蓝色链接体系) ————————————————————————— */
.ds-link {
  color: var(--ds-color-link);
  text-decoration: none;
  font-family: var(--ds-font-body-medium-family);
  font-size: var(--ds-font-body-medium-size);
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  text-underline-offset: 3px;
  transition: color var(--ds-motion-short-2) var(--ds-easing-standard),
              text-decoration-color var(--ds-motion-short-2) var(--ds-easing-standard);
}
.ds-link:hover {
  color: var(--ds-color-link-hover);
  text-decoration: underline;
}
.ds-link:focus-visible {
  outline: 2px solid var(--ds-color-link);
  outline-offset: 2px;
  border-radius: 2px;
}
.ds-link--underline {
  text-decoration: underline;
}
.ds-link--muted {
  color: var(--ds-color-on-surface-variant);
  font-weight: 400;
}
.ds-link--muted:hover {
  color: var(--ds-color-link);
  text-decoration: underline;
}

/* —— Button loading ————————————————————————————————————— */
.ds-btn.is-loading {
  position: relative;
  color: transparent !important;
  pointer-events: none;
}
.ds-btn.is-loading::after {
  content: "";
  position: absolute;
  width: 16px; height: 16px;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: ds-spin 0.7s linear infinite;
  border-color: color-mix(in srgb, var(--ds-color-on-primary) 35%, transparent);
  border-top-color: var(--ds-color-on-primary);
  left: 50%; top: 50%;
  margin: -8px 0 0 -8px;
}
.ds-btn--outline.is-loading::after,
.ds-btn--ghost.is-loading::after,
.ds-btn--secondary.is-loading::after {
  border-color: color-mix(in srgb, var(--ds-color-primary) 30%, transparent);
  border-top-color: var(--ds-color-primary);
}

/* —— Toast / Snackbar ———————————————————————————————————— */
.ds-toast-host {
  position: fixed;
  bottom: var(--ds-sys-space-xl);
  right: var(--ds-sys-space-xl);
  z-index: 300;
  display: flex;
  flex-direction: column;
  gap: var(--ds-sys-space-sm);
  max-width: 360px;
  pointer-events: none;
}
.ds-toast {
  pointer-events: auto;
  display: flex;
  align-items: flex-start;
  gap: var(--ds-sys-space-md);
  padding: var(--ds-sys-space-md) var(--ds-sys-space-lg);
  background: var(--ds-color-surface-container-lowest);
  border: 1px solid var(--ds-color-outline-variant);
  border-radius: var(--ds-corner-medium);
  box-shadow: var(--ds-elevation-soft), var(--ds-elevation-3);
  font-family: var(--ds-font-body-medium-family);
  font-size: var(--ds-font-body-medium-size);
  color: var(--ds-color-on-surface);
  animation: ds-fade-in var(--ds-motion-short-4) var(--ds-easing-decelerate);
}
.ds-toast-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  margin-top: 1px;
}
.ds-toast--success .ds-toast-icon { color: var(--ds-color-success); }
.ds-toast--error .ds-toast-icon { color: var(--ds-color-error); }
.ds-toast--warning .ds-toast-icon { color: var(--ds-color-warning); }
.ds-toast--info .ds-toast-icon { color: var(--ds-color-info); }
.ds-toast-msg { flex: 1; }
.ds-toast-close {
  background: none; border: none; cursor: pointer;
  color: var(--ds-color-on-surface-variant); padding: 0; line-height: 1;
  font-size: 18px;
  transition: color var(--ds-motion-short-2) var(--ds-easing-standard);
}
.ds-toast-close:hover { color: var(--ds-color-on-surface); }

/* —— Pagination ————————————————————————————————————————— */
.ds-pagination {
  display: flex;
  align-items: center;
  gap: var(--ds-sys-space-xs);
}
.ds-page-btn {
  min-width: 36px; height: 36px;
  padding: 0 var(--ds-sys-space-sm);
  display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid var(--ds-color-outline-variant);
  border-radius: var(--ds-corner-extra-small);
  background: var(--ds-color-surface-container-lowest);
  color: var(--ds-color-on-surface);
  font-family: var(--ds-font-label-medium-family);
  font-size: var(--ds-font-label-medium-size);
  font-weight: 500;
  cursor: pointer;
  transition: background var(--ds-motion-short-2) var(--ds-easing-standard);
}
.ds-page-btn:hover:not(:disabled):not([aria-current="page"]) {
  background: var(--ds-color-surface-container-low);
}
.ds-page-btn[aria-current="page"] {
  background: var(--ds-color-primary);
  color: var(--ds-color-on-primary);
  border-color: var(--ds-color-primary);
}
.ds-page-btn:disabled {
  opacity: 0.38; cursor: not-allowed;
}

/* —— Breadcrumb ————————————————————————————————————————— */
.ds-breadcrumb {
  display: flex; flex-wrap: wrap; align-items: center;
  gap: var(--ds-sys-space-xs);
  font-family: var(--ds-font-body-medium-family);
  font-size: var(--ds-font-body-medium-size);
  color: var(--ds-color-on-surface-variant);
  list-style: none; margin: 0; padding: 0;
}
.ds-breadcrumb li { display: inline-flex; align-items: center; gap: var(--ds-sys-space-xs); }
.ds-breadcrumb a {
  color: var(--ds-color-on-surface-variant);
  text-decoration: none;
}
.ds-breadcrumb a:hover { color: var(--ds-color-primary); }
.ds-breadcrumb button {
  appearance: none;
  border: 0;
  background: none;
  padding: 0;
  font: inherit;
  line-height: inherit;
  color: var(--ds-color-on-surface-variant);
  cursor: pointer;
}
.ds-breadcrumb button:hover { color: var(--ds-color-primary); }
.ds-breadcrumb [aria-current="page"] {
  color: var(--ds-color-on-surface);
  font-weight: 500;
}
.ds-breadcrumb-sep { opacity: 0.5; user-select: none; }

/* —— App shell: Top bar + Sidebar ——————————————————————— */
.ds-page-header {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: var(--ds-sys-space-md);
  padding: var(--ds-sys-space-md) var(--ds-sys-space-xl);
  background: var(--ds-color-surface-container);
  border-bottom: 1px solid var(--ds-color-outline-variant);
}

.ds-page-header-left {
  display: flex;
  align-items: center;
  gap: var(--ds-sys-space-sm);
  min-width: 0;
}

.ds-page-header-title {
  font-family: var(--ds-font-title-medium-family);
  font-weight: var(--ds-font-title-medium-weight);
  font-size: var(--ds-font-title-medium-size);
  letter-spacing: var(--ds-font-title-medium-tracking);
  color: var(--ds-color-on-surface);
  margin: 0;
  text-align: center;
}

.ds-page-header-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--ds-sys-space-sm);
}

.ds-page-header--breadcrumb {
  grid-template-columns: 1fr;
}

.ds-page-header--breadcrumb .ds-breadcrumb {
  font-family: var(--ds-font-title-medium-family);
  font-weight: var(--ds-font-title-medium-weight);
  font-size: var(--ds-font-title-medium-size);
  line-height: var(--ds-font-title-medium-line-height);
  letter-spacing: var(--ds-font-title-medium-tracking);
}

.ds-app-shell {
  display: grid;
  grid-template-columns: 240px 1fr;
  grid-template-rows: 56px 1fr;
  min-height: 320px;
  border: 1px solid var(--ds-color-outline-variant);
  border-radius: var(--ds-corner-medium);
  overflow: hidden;
  background: var(--ds-color-surface);
}
.ds-topbar {
  grid-column: 1 / -1;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 var(--ds-sys-space-lg);
  background: var(--ds-color-surface-container-lowest);
  border-bottom: 1px solid var(--ds-color-outline-variant);
  gap: var(--ds-sys-space-md);
}
.ds-topbar-brand {
  font-family: var(--ds-font-title-medium-family);
  font-weight: 600;
  font-size: var(--ds-font-title-medium-size);
  color: var(--ds-color-on-surface);
  display: flex; align-items: center; gap: var(--ds-sys-space-sm);
}
.ds-topbar-actions {
  display: flex; align-items: center; gap: var(--ds-sys-space-sm);
}
.ds-sidebar {
  background: var(--ds-color-surface-container-low);
  border-right: 1px solid var(--ds-color-outline-variant);
  padding: var(--ds-sys-space-md) var(--ds-sys-space-sm);
  display: flex; flex-direction: column; gap: 2px;
  overflow-y: auto;
}
.ds-nav-group {
  font-family: var(--ds-font-label-small-family);
  font-size: var(--ds-font-label-small-size);
  font-weight: 500;
  letter-spacing: var(--ds-font-label-small-tracking);
  color: var(--ds-color-on-surface-variant);
  padding: var(--ds-sys-space-md) var(--ds-sys-space-md) var(--ds-sys-space-xs);
  text-transform: uppercase;
}
.ds-nav-item {
  display: flex; align-items: center; gap: var(--ds-sys-space-sm);
  padding: var(--ds-sys-space-sm) var(--ds-sys-space-md);
  border-radius: var(--ds-corner-small);
  border: none; background: transparent;
  font-family: var(--ds-font-body-medium-family);
  font-size: var(--ds-font-body-medium-size);
  color: var(--ds-color-on-surface);
  cursor: pointer; text-align: left; width: 100%;
  transition: background var(--ds-motion-short-2) var(--ds-easing-standard);
}
.ds-nav-item:hover { background: var(--ds-color-surface-container); }
.ds-nav-item[aria-current="page"],
.ds-nav-item.is-active,
.ds-nav-item.aria-current {
  background: var(--ds-color-surface-container-high);
  color: var(--ds-color-on-surface);
  font-weight: 600;
  box-shadow: var(--ds-elevation-soft);
}
.ds-nav-item svg { flex-shrink: 0; opacity: 0.8; }
.ds-nav-item[aria-current="page"] svg,
.ds-nav-item.is-active svg,
.ds-nav-item.aria-current svg {
  opacity: 1;
  color: var(--ds-color-primary);
}
.ds-shell-main {
  padding: var(--ds-sys-space-lg);
  background: var(--ds-color-surface);
  color: var(--ds-color-on-surface-variant);
  font-family: var(--ds-font-body-medium-family);
  font-size: var(--ds-font-body-medium-size);
}

/* —— Drawer ————————————————————————————————————————————— */
.ds-drawer-backdrop {
  position: fixed; inset: 0;
  background: var(--ds-color-scrim);
  z-index: 2000;
  opacity: 0; visibility: hidden;
  pointer-events: none;
  transition: opacity var(--ds-motion-medium-1) var(--ds-easing-standard);
}
.ds-drawer-backdrop.open { opacity: 1; visibility: visible; pointer-events: auto; }
.ds-drawer {
  position: fixed; top: 0; right: 0; bottom: 0;
  width: min(360px, 90vw);
  background: var(--ds-color-surface-container-lowest);
  box-shadow: var(--ds-elevation-4);
  z-index: 2001;
  display: flex; flex-direction: column;
  transform: translateX(100%);
  transition: transform var(--ds-motion-medium-2) var(--ds-easing-emphasized);
}
.ds-drawer-backdrop.open .ds-drawer { transform: translateX(0); }
.ds-drawer-header {
  flex: 0 0 auto;
  padding: var(--ds-sys-space-lg) var(--ds-sys-space-xl);
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--ds-sys-space-md);
  border-bottom: 1px solid var(--ds-color-outline-variant);
}
.ds-drawer-title {
  font-family: var(--ds-font-title-large-family);
  font-weight: var(--ds-font-title-large-weight);
  font-size: var(--ds-font-title-large-size);
  margin: 0; color: var(--ds-color-on-surface);
}
.ds-drawer-container,
.ds-drawer-body {
  padding: var(--ds-sys-space-xl);
  overflow-y: auto; flex: 1;
  min-height: 0;
  font-family: var(--ds-font-body-medium-family);
  font-size: var(--ds-font-body-medium-size);
  color: var(--ds-color-on-surface-variant);
}
.ds-drawer-footer {
  flex: 0 0 auto;
  padding: var(--ds-sys-space-md) var(--ds-sys-space-xl);
  border-top: 1px solid var(--ds-color-outline-variant);
  display: flex; justify-content: flex-end; gap: var(--ds-sys-space-sm);
}

/* —— Accordion —————————————————————————————————————————— */
.ds-accordion {
  border: 1px solid var(--ds-color-outline-variant);
  border-radius: var(--ds-corner-medium);
  overflow: hidden;
  background: var(--ds-color-surface-container-lowest);
}
.ds-accordion-item + .ds-accordion-item {
  border-top: 1px solid var(--ds-color-outline-variant);
}
.ds-accordion-trigger {
  width: 100%;
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--ds-sys-space-md);
  padding: var(--ds-sys-space-md) var(--ds-sys-space-lg);
  background: transparent; border: none; cursor: pointer; text-align: left;
  font-family: var(--ds-font-title-small-family);
  font-weight: var(--ds-font-title-small-weight);
  font-size: var(--ds-font-title-small-size);
  color: var(--ds-color-on-surface);
}
.ds-accordion-trigger:hover { background: var(--ds-color-surface-container-low); }
.ds-accordion-trigger svg {
  transition: transform var(--ds-motion-short-4) var(--ds-easing-standard);
  color: var(--ds-color-on-surface-variant);
}
.ds-accordion-item.open .ds-accordion-trigger svg { transform: rotate(180deg); }
.ds-accordion-panel {
  display: none;
  padding: 0 var(--ds-sys-space-lg) var(--ds-sys-space-lg);
  font-family: var(--ds-font-body-medium-family);
  font-size: var(--ds-font-body-medium-size);
  color: var(--ds-color-on-surface-variant);
  line-height: 1.5;
}
.ds-accordion-item.open .ds-accordion-panel { display: block; }

/* —— Empty state ———————————————————————————————————————— */
.ds-empty {
  text-align: center;
  padding: var(--ds-sys-space-xxxl) var(--ds-sys-space-xl);
  background: var(--ds-color-surface-container-lowest);
  border: 1px dashed var(--ds-color-outline-variant);
  border-radius: var(--ds-corner-medium);
}
.ds-empty-icon {
  width: 48px; height: 48px; margin: 0 auto var(--ds-sys-space-md);
  border-radius: var(--ds-corner-full);
  background: var(--ds-color-primary-container);
  color: var(--ds-color-on-primary-container);
  display: flex; align-items: center; justify-content: center;
}
.ds-empty-title {
  font-family: var(--ds-font-title-medium-family);
  font-weight: var(--ds-font-title-medium-weight);
  font-size: var(--ds-font-title-medium-size);
  color: var(--ds-color-on-surface);
  margin: 0 0 var(--ds-sys-space-xs);
}
.ds-empty-desc {
  font-family: var(--ds-font-body-medium-family);
  font-size: var(--ds-font-body-medium-size);
  color: var(--ds-color-on-surface-variant);
  margin: 0 0 var(--ds-sys-space-lg);
  max-width: 320px; margin-left: auto; margin-right: auto;
}

/* —— Stepper ———————————————————————————————————————————— */
.ds-stepper {
  display: flex; align-items: flex-start; width: 100%;
}
.ds-step {
  flex: 1; display: flex; flex-direction: column; align-items: center;
  position: relative; text-align: center;
}
.ds-step:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 14px; left: calc(50% + 18px); right: calc(-50% + 18px);
  height: 2px;
  background: var(--ds-color-outline-variant);
}
.ds-step.is-done:not(:last-child)::after,
.ds-step.is-active:not(:last-child)::after {
  background: var(--ds-color-primary);
}
.ds-step-dot {
  width: 28px; height: 28px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--ds-font-label-medium-family);
  font-size: var(--ds-font-label-medium-size);
  font-weight: 500;
  background: var(--ds-color-surface-container-high);
  color: var(--ds-color-on-surface-variant);
  border: 2px solid transparent;
  z-index: 1;
}
.ds-step.is-done .ds-step-dot {
  background: var(--ds-color-primary);
  color: var(--ds-color-on-primary);
}
.ds-step.is-active .ds-step-dot {
  border-color: var(--ds-color-primary);
  background: var(--ds-color-primary-container);
  color: var(--ds-color-on-primary-container);
}
.ds-step-label {
  margin-top: var(--ds-sys-space-sm);
  font-family: var(--ds-font-label-medium-family);
  font-size: var(--ds-font-label-medium-size);
  color: var(--ds-color-on-surface-variant);
}
.ds-step.is-active .ds-step-label,
.ds-step.is-done .ds-step-label {
  color: var(--ds-color-on-surface);
  font-weight: 500;
}

/* —— Segmented control ————————————————————————————————— */
.ds-segmented {
  display: inline-flex;
  padding: 3px;
  background: var(--ds-color-surface-container);
  border-radius: var(--ds-corner-small);
  gap: 2px;
}
.ds-segment {
  border: none; background: transparent; cursor: pointer;
  padding: 6px 14px;
  border-radius: var(--ds-corner-extra-small);
  font-family: var(--ds-font-label-large-family);
  font-size: var(--ds-font-label-large-size);
  font-weight: 500;
  color: var(--ds-color-on-surface-variant);
  transition: background var(--ds-motion-short-2) var(--ds-easing-standard),
              color var(--ds-motion-short-2) var(--ds-easing-standard);
}
.ds-segment:hover { color: var(--ds-color-on-surface); }
.ds-segment[aria-selected="true"] {
  background: var(--ds-color-surface-container-lowest);
  color: var(--ds-color-on-surface);
  box-shadow: var(--ds-elevation-soft);
}

/* —— List item —————————————————————————————————————————— */
.ds-list {
  border: 1px solid var(--ds-color-outline-variant);
  border-radius: var(--ds-corner-medium);
  overflow: hidden;
  background: var(--ds-color-surface-container-lowest);
}
.ds-list-item {
  display: flex; align-items: center; gap: var(--ds-sys-space-md);
  padding: var(--ds-sys-space-md) var(--ds-sys-space-lg);
  border-bottom: 1px solid var(--ds-color-outline-variant);
  cursor: pointer;
  transition: background var(--ds-motion-short-2) var(--ds-easing-standard);
}
.ds-list-item:last-child { border-bottom: none; }
.ds-list-item:nth-child(even) { background: var(--ds-color-surface-container-low); }
.ds-list-item:hover { background: var(--ds-color-surface-container); }
.ds-list-item-body { flex: 1; min-width: 0; }
.ds-list-item-title {
  font-family: var(--ds-font-title-small-family);
  font-weight: 500;
  font-size: var(--ds-font-title-small-size);
  color: var(--ds-color-on-surface);
  margin: 0;
}
.ds-list-item-desc {
  font-family: var(--ds-font-body-small-family);
  font-size: var(--ds-font-body-small-size);
  color: var(--ds-color-on-surface-variant);
  margin: 2px 0 0;
}

/* —— Slider ———————————————————————————————————————————— */
.ds-slider-wrap {
  display: flex; flex-direction: column; gap: var(--ds-sys-space-xs);
  max-width: 320px;
}
.ds-slider {
  -webkit-appearance: none; appearance: none;
  width: 100%; height: 6px;
  border-radius: var(--ds-corner-full);
  background: var(--ds-color-surface-container-high);
  outline: none;
}
.ds-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--ds-color-primary);
  border: 2px solid var(--ds-color-surface-container-lowest);
  box-shadow: var(--ds-elevation-1);
  cursor: pointer;
}
.ds-slider::-moz-range-thumb {
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--ds-color-primary);
  border: 2px solid var(--ds-color-surface-container-lowest);
  cursor: pointer;
}

/* —— File upload ——————————————————————————————————————— */
.ds-upload {
  border: 1.5px dashed var(--ds-color-outline);
  border-radius: var(--ds-corner-medium);
  padding: var(--ds-sys-space-xl);
  text-align: center;
  background: var(--ds-color-surface-container-lowest);
  transition: border-color var(--ds-motion-short-3) var(--ds-easing-standard),
              background var(--ds-motion-short-3) var(--ds-easing-standard);
  cursor: pointer;
}
.ds-upload:hover,
.ds-upload.is-dragover {
  border-color: var(--ds-color-primary);
  background: var(--ds-color-primary-container);
}
.ds-upload-title {
  font-family: var(--ds-font-title-small-family);
  font-weight: 500;
  color: var(--ds-color-on-surface);
  margin: 0 0 4px;
}
.ds-upload-hint {
  font-family: var(--ds-font-body-small-family);
  font-size: var(--ds-font-body-small-size);
  color: var(--ds-color-on-surface-variant);
  margin: 0;
}

/* —— Chips / multi tags ————————————————————————————————— */
.ds-chip-input {
  display: flex; flex-wrap: wrap; gap: 6px; align-items: center;
  min-height: 40px;
  padding: 6px var(--ds-sys-space-sm);
  border: 1px solid var(--ds-color-outline);
  border-radius: var(--ds-corner-small);
  background: var(--ds-color-surface-container-lowest);
  max-width: 400px;
}
.ds-chip-input:focus-within {
  border-color: var(--ds-color-primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--ds-color-primary) 20%, transparent);
}
.ds-chip {
  display: inline-flex; align-items: center; gap: 4px;
  height: 26px; padding: 0 8px 0 10px;
  border-radius: var(--ds-corner-full);
  background: var(--ds-color-secondary-container);
  color: var(--ds-color-on-secondary-container);
  font-family: var(--ds-font-label-medium-family);
  font-size: var(--ds-font-label-medium-size);
  font-weight: 500;
}
.ds-chip-remove {
  border: none; background: transparent; cursor: pointer;
  color: inherit; opacity: 0.7; padding: 0; line-height: 1;
  font-size: 14px;
}
.ds-chip-remove:hover { opacity: 1; }
.ds-chip-input input {
  border: none; outline: none; background: transparent;
  flex: 1; min-width: 80px;
  font-family: var(--ds-font-body-medium-family);
  font-size: var(--ds-font-body-medium-size);
  color: var(--ds-color-on-surface);
}

/* —— Popover ———————————————————————————————————————————— */
.ds-popover-wrap { position: relative; display: inline-block; }
.ds-popover {
  position: absolute;
  top: calc(100% + 8px); left: 0;
  min-width: 200px;
  padding: var(--ds-sys-space-md);
  background: var(--ds-color-surface-container-lowest);
  border: 1px solid var(--ds-color-outline-variant);
  border-radius: var(--ds-corner-medium);
  box-shadow: var(--ds-elevation-soft), var(--ds-elevation-3);
  z-index: 50;
  display: none;
  font-family: var(--ds-font-body-medium-family);
  font-size: var(--ds-font-body-medium-size);
  color: var(--ds-color-on-surface-variant);
}
.ds-popover-wrap.open .ds-popover { display: block; animation: ds-fade-in var(--ds-motion-short-4) var(--ds-easing-decelerate); }

/* —— Context menu —————————————————————————————————————— */
.ds-menu {
  min-width: 220px;
  padding: var(--ds-sys-space-xs);
  background: var(--ds-color-surface-container-lowest);
  border: 1px solid var(--ds-color-outline-variant);
  border-radius: var(--ds-corner-medium);
  box-shadow: var(--ds-elevation-soft), var(--ds-elevation-3);
}
.ds-menu-item {
  display: flex; align-items: center; gap: var(--ds-sys-space-sm);
  width: 100%; padding: var(--ds-sys-space-sm) var(--ds-sys-space-md);
  border: none; background: transparent; cursor: pointer; text-align: left;
  border-radius: var(--ds-corner-extra-small);
  font-family: var(--ds-font-body-medium-family);
  font-size: var(--ds-font-body-medium-size);
  color: var(--ds-color-on-surface);
}
.ds-menu-item:hover { background: var(--ds-color-surface-container-low); }
.ds-menu-item--danger { color: var(--ds-color-error); }
.ds-menu-item--danger:hover { background: var(--ds-color-error-container); }
.ds-menu-sep {
  height: 1px; background: var(--ds-color-outline-variant);
  margin: var(--ds-sys-space-xs) 0; border: none;
}

/* —— Notification badge on icon ————————————————————————— */
.ds-icon-btn {
  position: relative;
  width: 40px; height: 40px;
  border-radius: var(--ds-corner-full);
  border: none; background: transparent; cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center;
  color: var(--ds-color-on-surface);
}
.ds-icon-btn:hover { background: var(--ds-color-surface-container); }
.ds-notif-dot {
  position: absolute; top: 8px; right: 8px;
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--ds-color-error);
  border: 2px solid var(--ds-color-surface-container-lowest);
}
.ds-notif-count {
  position: absolute; top: 4px; right: 2px;
  min-width: 16px; height: 16px; padding: 0 4px;
  border-radius: var(--ds-corner-full);
  background: var(--ds-color-error);
  color: var(--ds-color-on-error);
  font-family: var(--ds-font-label-small-family);
  font-size: 10px; font-weight: 600;
  display: flex; align-items: center; justify-content: center;
  border: 2px solid var(--ds-color-surface-container-lowest);
}

/* —— Theme toggle bar —————————————————————————————————————— */
.ds-theme-bar {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--ds-sys-space-md) var(--ds-sys-space-lg);
  background: var(--ds-color-surface-container);
  border-bottom: 1px solid var(--ds-color-outline-variant);
  backdrop-filter: blur(8px);
}

.ds-theme-bar-title {
  font-family: var(--ds-font-title-medium-family);
  font-weight: var(--ds-font-title-medium-weight);
  font-size: var(--ds-font-title-medium-size);
  margin: 0;
}

/* —— Grid helpers for demo ————————————————————————————————— */
.ds-grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--ds-sys-space-lg);
}

.ds-grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--ds-sys-space-lg);
}

.ds-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--ds-sys-space-lg);
}

@media (max-width: 1199px) {
  .ds-grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 575px) {
  .ds-grid-4 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
}

/* —— Progress / Spinner ———————————————————————————————————— */
.ds-progress {
  height: 6px;
  background: var(--ds-color-surface-container-high);
  border-radius: var(--ds-corner-full);
  overflow: hidden;
}

.ds-progress-bar {
  height: 100%;
  background: var(--ds-color-primary);
  border-radius: var(--ds-corner-full);
  transition: width var(--ds-motion-medium-2) var(--ds-easing-standard);
}

.ds-spinner {
  width: 24px;
  height: 24px;
  border: 2.5px solid var(--ds-color-surface-container-high);
  border-top-color: var(--ds-color-primary);
  border-radius: 50%;
  animation: ds-spin 0.7s linear infinite;
}

@keyframes ds-spin {
  to { transform: rotate(360deg); }
}

[data-theme="dark"] .ds-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23c4c4c8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
}
[data-theme="dark"] .ds-select:focus {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2377bdff' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
}

.ds-btn--block { width: 100%; }

/* —— TextButton：纯文本按钮，无底、无描边、无 40px 控件高度 ————— */
.ds-text-btn {
  appearance: none;
  display: inline-flex;
  align-items: center;
  gap: var(--ds-sys-space-xs);
  margin: 0;
  padding: 0;
  border: none;
  background: transparent;
  color: var(--ds-color-on-surface);
  font-family: var(--ds-font-label-large-family);
  font-weight: var(--ds-font-label-large-weight);
  line-height: var(--ds-font-label-large-line-height);
  letter-spacing: var(--ds-font-label-large-tracking);
  cursor: pointer;
  border-radius: var(--ds-corner-extra-small);
  user-select: none;
}
.ds-text-btn--sm {
  font-family: var(--ds-font-label-medium-family);
  font-size: var(--ds-font-label-medium-size);
  font-weight: var(--ds-font-label-medium-weight);
  line-height: var(--ds-font-label-medium-line-height);
}
.ds-text-btn--md { font-size: var(--ds-font-label-large-size); }
.ds-text-btn--lg {
  font-family: var(--ds-font-title-small-family);
  font-size: var(--ds-font-title-small-size);
  line-height: var(--ds-font-title-small-line-height);
}
.ds-text-btn--filled { color: var(--ds-color-on-surface); font-weight: 600; }
.ds-text-btn--soft { color: var(--ds-color-on-surface-variant); }
.ds-text-btn--outline { color: var(--ds-color-on-surface); text-decoration: underline; text-underline-offset: 3px; }
.ds-text-btn--ghost { color: var(--ds-color-primary); }
.ds-text-btn--danger,
.ds-text-btn--danger-ghost { color: var(--ds-color-error); }
.ds-text-btn:hover:not(:disabled) { color: var(--ds-color-primary); }
.ds-text-btn--soft:hover:not(:disabled) { color: var(--ds-color-on-surface); }
.ds-text-btn--danger:hover:not(:disabled),
.ds-text-btn--danger-ghost:hover:not(:disabled) {
  color: color-mix(in srgb, var(--ds-color-error) 82%, black);
}
.ds-text-btn:focus-visible {
  outline: 2px solid var(--ds-color-primary);
  outline-offset: 2px;
}
.ds-text-btn:disabled {
  opacity: 0.38;
  cursor: not-allowed;
}
.ds-text-btn--block { width: 100%; justify-content: center; }
.ds-text-btn.is-loading { pointer-events: none; }
.ds-text-btn-icon {
  display: inline-flex;
  align-items: center;
}
.ds-field--full { max-width: none; }
.ds-input--sm, .ds-select--sm, .ds-textarea--sm { height: 32px; font-size: var(--ds-font-body-small-size); }
.ds-input--lg, .ds-select--lg, .ds-textarea--lg { height: 48px; }

/* —— Surface (tone / shape / elevation) ——————————————————— */
.ds-surface {
  color: var(--ds-color-on-surface);
}
.ds-surface--surface { background: var(--ds-color-surface); }
.ds-surface--container-lowest { background: var(--ds-color-surface-container-lowest); }
.ds-surface--container-low { background: var(--ds-color-surface-container-low); }
.ds-surface--container { background: var(--ds-color-surface-container); }
.ds-surface--container-high { background: var(--ds-color-surface-container-high); }
.ds-surface--container-highest { background: var(--ds-color-surface-container-highest); }
.ds-surface--primary-container {
  background: var(--ds-color-primary-container);
  color: var(--ds-color-on-primary-container);
}
.ds-surface--secondary-container {
  background: var(--ds-color-secondary-container);
  color: var(--ds-color-on-secondary-container);
}
.ds-surface--tertiary-container {
  background: var(--ds-color-tertiary-container);
  color: var(--ds-color-on-tertiary-container);
}
.ds-surface--shape-none { border-radius: var(--ds-corner-none); }
.ds-surface--shape-xs { border-radius: var(--ds-corner-extra-small); }
.ds-surface--shape-sm { border-radius: var(--ds-corner-small); }
.ds-surface--shape-md { border-radius: var(--ds-corner-medium); }
.ds-surface--shape-lg { border-radius: var(--ds-corner-large); }
.ds-surface--shape-xl { border-radius: var(--ds-corner-extra-large); }
.ds-surface--shape-full { border-radius: var(--ds-corner-full); }
.ds-surface--elev-0 { box-shadow: none; }
.ds-surface--elev-1 { box-shadow: var(--ds-elevation-soft); }
.ds-surface--elev-2 { box-shadow: var(--ds-elevation-1); }
.ds-surface--elev-3 { box-shadow: var(--ds-elevation-2); }
.ds-surface--elev-4 { box-shadow: var(--ds-elevation-3); }
.ds-surface--bordered { border: 1px solid var(--ds-color-outline-variant); }
.ds-surface--interactive { cursor: pointer; transition: background var(--ds-motion-short-2) var(--ds-easing-standard); }
.ds-surface--interactive:hover { background: var(--ds-color-surface-container-high); }

/* —— Card variants from refined palette ——————————————————— */
.ds-card--outlined {
  background: var(--ds-color-surface-container-lowest);
  border-color: var(--ds-color-outline);
  box-shadow: none;
}
.ds-card--filled {
  background: var(--ds-color-surface-container);
  border-color: transparent;
  box-shadow: none;
}
.ds-card--interactive { cursor: pointer; }

/* —— Icon button variants ——————————————————————————————— */
.ds-icon-btn--sm { width: 32px; height: 32px; }
.ds-icon-btn--md { width: 36px; height: 36px; }
.ds-icon-btn--lg { width: 44px; height: 44px; }
.ds-icon-btn--filled {
  background: var(--ds-color-primary);
  color: var(--ds-color-on-primary);
}
.ds-icon-btn--filled:hover { filter: brightness(1.06); background: var(--ds-color-primary); }
.ds-icon-btn--tonal {
  background: var(--ds-color-secondary-container);
  color: var(--ds-color-on-secondary-container);
}
.ds-icon-btn--outlined {
  border: 1px solid var(--ds-color-outline-variant);
  color: var(--ds-color-on-surface);
}
.ds-icon-btn--text { color: var(--ds-color-on-surface-variant); }
.ds-icon-btn--danger { color: var(--ds-color-error); }
.ds-icon-btn--danger:hover { background: var(--ds-color-error-container); }
.ds-icon-btn--shape-none { border-radius: var(--ds-corner-none); }
.ds-icon-btn--shape-xs { border-radius: var(--ds-corner-extra-small); }
.ds-icon-btn--shape-sm { border-radius: var(--ds-corner-small); }
.ds-icon-btn--shape-md { border-radius: var(--ds-corner-medium); }
.ds-icon-btn--shape-lg { border-radius: var(--ds-corner-large); }
.ds-icon-btn--shape-xl { border-radius: var(--ds-corner-extra-large); }
.ds-icon-btn--shape-full { border-radius: var(--ds-corner-full); }

/* —— Chip selected / sizes ——————————————————————————————— */
.ds-chip--xs { height: 20px; padding: 0 6px; font-size: 10px; }
.ds-chip--sm { height: 24px; padding: 0 8px; font-size: 11px; }
.ds-chip--lg { height: 32px; padding: 0 12px; }
.ds-chip--xl { height: 36px; padding: 0 14px; font-size: 14px; }
.ds-chip--selected {
  background: var(--ds-color-primary-container);
  color: var(--ds-color-on-primary-container);
  border: 1px solid var(--ds-color-primary);
}
.ds-chip--selectable { cursor: pointer; border: 1px solid var(--ds-color-outline-variant); }
.ds-chip.is-disabled { opacity: 0.5; pointer-events: none; }

/* —— Tabs pills ————————————————————————————————————————— */
.ds-tabs--pills {
  border-bottom: none;
  gap: 6px;
  padding: 4px;
  background: var(--ds-color-surface-container-low);
  border: 1px solid var(--ds-color-outline-variant);
  border-radius: var(--ds-corner-large);
  width: max-content;
}
.ds-tabs--pills .ds-tab {
  border-radius: var(--ds-corner-small);
  padding: 6px 12px;
}
.ds-tabs--pills .ds-tab[aria-selected="true"] {
  background: var(--ds-color-surface-container-lowest);
  color: var(--ds-color-on-surface);
  box-shadow: var(--ds-elevation-soft);
}
.ds-tabs--pills .ds-tab[aria-selected="true"]::after { display: none; }
.ds-tabs--full { width: 100%; }
.ds-tabs--full .ds-tab { flex: 1; }

/* —— Progress variants / sizes ——————————————————————————— */
.ds-progress-wrap {
  display: flex;
  flex-direction: column;
  gap: var(--ds-sys-space-xs);
  width: 100%;
}
.ds-progress-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--ds-font-label-medium-family);
  font-size: var(--ds-font-label-medium-size);
  color: var(--ds-color-on-surface);
}
.ds-progress-value {
  color: var(--ds-color-on-surface-variant);
  font-family: var(--ds-typeface-code);
}
.ds-progress--sm { height: 4px; }
.ds-progress--lg { height: 10px; }
.ds-progress-bar--secondary { background: var(--ds-color-secondary); }
.ds-progress-bar--tertiary { background: var(--ds-color-tertiary); }
.ds-progress-bar--success { background: var(--ds-color-success); }
.ds-progress-bar--warning { background: var(--ds-color-warning); }
.ds-progress-bar--error { background: var(--ds-color-error); }
.ds-progress-bar--indeterminate {
  width: 33%;
  animation: ds-progress-pulse 1.2s var(--ds-easing-standard) infinite;
}
@keyframes ds-progress-pulse {
  0%, 100% { opacity: 0.45; }
  50% { opacity: 1; }
}

/* —— Avatar status + shape ——————————————————————————————— */
.ds-avatar { position: relative; }
.ds-avatar--shape-md { border-radius: var(--ds-corner-medium); }
.ds-avatar--shape-lg { border-radius: var(--ds-corner-large); }
.ds-avatar-status {
  position: absolute;
  right: 0;
  bottom: 0;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 2px solid var(--ds-color-surface);
}
.ds-avatar-status--online { background: var(--ds-color-success); }
.ds-avatar-status--offline { background: var(--ds-color-on-surface-variant); opacity: 0.45; }
.ds-avatar-status--busy { background: var(--ds-color-error); }
.ds-avatar-status--away { background: var(--ds-color-warning); }

/* —— Divider variants ——————————————————————————————————— */
.ds-divider--vertical {
  width: 1px;
  height: auto;
  align-self: stretch;
  margin: 0;
  display: inline-block;
}
.ds-divider--inset { margin-inline: var(--ds-sys-space-lg); }
.ds-divider--vertical.ds-divider--inset { margin-inline: 0; margin-block: var(--ds-sys-space-sm); }

/* —— Control label stack (checkbox / radio / switch) ——————— */
.ds-control {
  display: inline-flex;
  align-items: flex-start;
  gap: var(--ds-sys-space-sm);
  cursor: pointer;
  user-select: none;
}
.ds-control.is-disabled,
.ds-check.is-disabled,
.ds-radio.is-disabled,
.ds-switch.is-disabled { opacity: 0.5; pointer-events: none; }
.ds-control-copy { display: flex; flex-direction: column; }
.ds-control-label {
  font-family: var(--ds-font-body-medium-family);
  font-size: var(--ds-font-body-medium-size);
  font-weight: 500;
  color: var(--ds-color-on-surface);
}
.ds-control-desc {
  font-family: var(--ds-font-body-small-family);
  font-size: var(--ds-font-body-small-size);
  color: var(--ds-color-on-surface-variant);
  margin-top: 2px;
}

/* —— Input affix wrap ——————————————————————————————————— */
.ds-input-wrap { position: relative; display: flex; align-items: center; }
.ds-input-affix {
  position: absolute;
  display: inline-flex;
  align-items: center;
  color: var(--ds-color-on-surface-variant);
  pointer-events: none;
}
.ds-input-affix--leading { left: 12px; }
.ds-input-affix--trailing { right: 12px; pointer-events: auto; }
.ds-input--has-leading { padding-left: 36px; }
.ds-input--has-trailing { padding-right: 36px; }
.ds-input.is-error,
.ds-select.is-error {
  border-color: var(--ds-color-error);
}
.ds-input.is-error:focus,
.ds-select.is-error:focus {
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--ds-color-error) 16%, transparent);
}

/* —— Segmented sizes ——————————————————————————————————— */
.ds-segmented--sm { padding: 2px; }
.ds-segmented--sm .ds-segment { padding: 4px 10px; font-size: var(--ds-font-label-medium-size); }
.ds-segmented--lg { padding: 6px; }
.ds-segmented--lg .ds-segment { padding: 8px 16px; }
.ds-segmented--full { width: 100%; }
.ds-segmented--full .ds-segment { flex: 1; }

/* —— Alert layout helpers ——————————————————————————————— */
.ds-alert-copy { flex: 1; min-width: 0; display: flex; flex-direction: column; justify-content: center; }
.ds-alert-title {
  margin: 0;
  font-family: var(--ds-font-title-small-family);
  font-size: var(--ds-font-title-small-size);
  font-weight: 600;
  color: var(--ds-color-on-surface);
}
.ds-alert-desc {
  margin: 2px 0 0;
  font-family: var(--ds-font-body-small-family);
  font-size: var(--ds-font-body-small-size);
  color: var(--ds-color-on-surface-variant);
}
.ds-alert-action { margin-top: 10px; display: flex; gap: var(--ds-sys-space-sm); }

/* —— Modal width variants ——————————————————————————————— */
.ds-modal--sm,
.ds-modal--md,
.ds-modal--lg,
.ds-modal--xl,
.ds-modal--wide {
  width: 90%;
}
.ds-modal--sm { max-width: 360px; }
.ds-modal--md { max-width: 440px; }
.ds-modal--lg { max-width: 560px; }
.ds-modal--xl { max-width: 720px; }