/* thewyj Design System 2.0
 * Canonical semantic tokens and shared component states for Web and Android parity.
 */
:root {
  color-scheme: light;

  /* Typography */
  --ds-font-sans: "Segoe UI Variable", "Microsoft YaHei UI", "PingFang SC", system-ui, -apple-system, sans-serif;
  --ds-font-serif: Georgia, "Times New Roman", "Songti SC", serif;
  --ds-font-mono: "Cascadia Code", "SFMono-Regular", Consolas, monospace;
  --ds-text-xs: 12px;
  --ds-text-sm: 14px;
  --ds-text-md: 16px;
  --ds-text-lg: 18px;
  --ds-text-xl: 22px;
  --ds-text-2xl: 30px;
  --ds-text-display: 56px;
  --ds-leading-tight: 1.18;
  --ds-leading-body: 1.6;

  /* Four-pixel spacing scale */
  --ds-space-1: 4px;
  --ds-space-2: 8px;
  --ds-space-3: 12px;
  --ds-space-4: 16px;
  --ds-space-5: 20px;
  --ds-space-6: 24px;
  --ds-space-8: 32px;
  --ds-space-10: 40px;
  --ds-space-12: 48px;
  --ds-space-16: 64px;
  --ds-space-20: 80px;

  /* Shape and elevation */
  --ds-radius-xs: 4px;
  --ds-radius-sm: 6px;
  --ds-radius-md: 8px;
  --ds-radius-lg: 12px;
  --ds-radius-pill: 999px;
  --ds-border-width: 1px;
  --ds-shadow-card: 0 1px 2px rgba(15, 23, 42, 0.04), 0 10px 28px rgba(15, 23, 42, 0.055);
  --ds-shadow-raised: 0 14px 36px rgba(15, 23, 42, 0.1);
  --ds-shadow-dialog: 0 28px 72px rgba(15, 23, 42, 0.2);

  /* Motion */
  --ds-duration-instant: 80ms;
  --ds-duration-fast: 140ms;
  --ds-duration-normal: 200ms;
  --ds-duration-slow: 260ms;
  --ds-ease-standard: cubic-bezier(0.2, 0, 0, 1);
  --ds-ease-emphasized: cubic-bezier(0.2, 0.8, 0.2, 1);

  /* Layout and touch */
  --ds-container-reading: 760px;
  --ds-container-default: 1200px;
  --ds-container-wide: 1440px;
  --ds-touch-min: 44px;
  --ds-icon-sm: 16px;
  --ds-icon-md: 20px;
  --ds-icon-lg: 24px;

  /* Product workspace surfaces */
  --ds-workspace-canvas: #f5f6f8;
  --ds-workspace-canvas-warm: #f3f2ef;
  --ds-surface: #ffffff;
  --ds-surface-subtle: #f8fafc;
  --ds-surface-raised: #ffffff;
  --ds-surface-disabled: #e9edf2;
  --ds-text: #18212f;
  --ds-text-secondary: #475569;
  --ds-text-muted: #5b687a;
  --ds-text-disabled: #526174;
  --ds-border: #d8dee7;
  --ds-border-strong: #b9c4d0;

  /* Brand and semantic color */
  --ds-brand: #2563eb;
  --ds-brand-hover: #1d4ed8;
  --ds-brand-pressed: #1e40af;
  --ds-brand-soft: #edf4ff;
  --ds-on-brand: #ffffff;
  --ds-success: #147a46;
  --ds-success-soft: #eaf8f0;
  --ds-warning: #9a5708;
  --ds-warning-soft: #fff5de;
  --ds-error: #c23333;
  --ds-error-hover: #a92424;
  --ds-error-soft: #fff0f0;
  --ds-info: #1f5fbf;
  --ds-info-soft: #edf4ff;
  --ds-focus: #1d4ed8;
  --ds-focus-ring: 0 0 0 3px rgba(37, 99, 235, 0.28);

  /* Public brand stage */
  --ds-stage: #07090d;
  --ds-stage-surface: #11141a;
  --ds-stage-surface-raised: #171a21;
  --ds-stage-text: #f8fafc;
  --ds-stage-text-secondary: #b9c1cd;
  --ds-stage-border: rgba(255, 255, 255, 0.16);
  --ds-stage-brand: #8eb4ff;

  /* Compatibility aliases used by existing modules. */
  --color-background: var(--ds-workspace-canvas);
  --color-surface: var(--ds-surface);
  --color-surface-subtle: var(--ds-surface-subtle);
  --color-text: var(--ds-text);
  --color-text-secondary: var(--ds-text-secondary);
  --color-text-muted: var(--ds-text-muted);
  --color-text-disabled: var(--ds-text-disabled);
  --color-border: var(--ds-border);
  --color-border-strong: var(--ds-border-strong);
  --color-primary: var(--ds-brand);
  --color-primary-hover: var(--ds-brand-hover);
  --color-primary-soft: var(--ds-brand-soft);
  --color-success: var(--ds-success);
  --color-success-soft: var(--ds-success-soft);
  --color-warning: var(--ds-warning);
  --color-warning-soft: var(--ds-warning-soft);
  --color-error: var(--ds-error);
  --color-error-soft: var(--ds-error-soft);
  --radius-control: var(--ds-radius-md);
  --radius-card: var(--ds-radius-md);
  --shadow-card: var(--ds-shadow-card);
  --shadow-dialog: var(--ds-shadow-dialog);
  --space-1: var(--ds-space-1);
  --space-2: var(--ds-space-2);
  --space-3: var(--ds-space-3);
  --space-4: var(--ds-space-4);
  --space-5: var(--ds-space-5);
  --space-6: var(--ds-space-6);
  --space-8: var(--ds-space-8);
  --space-10: var(--ds-space-10);
  --font-xs: var(--ds-text-xs);
  --font-sm: var(--ds-text-sm);
  --font-md: var(--ds-text-md);
  --font-lg: var(--ds-text-lg);
  --font-xl: var(--ds-text-2xl);
  --duration-fast: var(--ds-duration-fast);
  --duration-normal: var(--ds-duration-normal);
  --page-max: var(--ds-container-default);
  --content-max: var(--ds-container-reading);
  --bg: var(--color-background);
  --panel: var(--color-surface);
  --ink: var(--color-text);
  --muted: var(--color-text-muted);
  --line: var(--color-border);
  --accent: var(--color-primary);
  --accent-strong: var(--color-primary-hover);
  --accent-2: var(--color-warning);
  --ok: var(--color-success);
  --danger: var(--color-error);
}

html {
  min-width: 320px;
  min-height: 100%;
  scroll-padding-top: calc(76px + env(safe-area-inset-top));
  background: var(--ds-workspace-canvas);
}

body {
  min-width: 320px;
  min-height: 100vh;
  min-height: 100dvh;
  margin: 0;
  overflow-x: hidden;
  color: var(--ds-text);
  background: var(--ds-workspace-canvas);
  font-family: var(--ds-font-sans);
  font-size: var(--ds-text-md);
  line-height: var(--ds-leading-body);
  letter-spacing: 0;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body[data-experience="workspace"] {
  background: var(--ds-workspace-canvas-warm);
}

body,
button,
input,
select,
textarea {
  font-family: var(--ds-font-sans);
  letter-spacing: 0;
}

h1,
h2,
h3,
h4,
p {
  overflow-wrap: anywhere;
}

h1,
h2,
h3,
h4,
strong {
  color: var(--ds-text);
  text-shadow: none;
}

h1 {
  font-size: var(--ds-text-2xl);
  line-height: var(--ds-leading-tight);
}

h2 {
  font-size: var(--ds-text-xl);
  line-height: 1.3;
}

h3 {
  font-size: var(--ds-text-lg);
  line-height: 1.35;
}

a {
  color: var(--ds-brand-hover);
  text-underline-offset: 3px;
}

button,
.button-link,
.button-primary,
.button-secondary,
.button-ghost,
.danger-button {
  min-height: var(--ds-touch-min);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--ds-space-2);
  padding: 0 var(--ds-space-4);
  border: var(--ds-border-width) solid var(--ds-border-strong);
  border-radius: var(--ds-radius-md);
  color: var(--ds-text);
  background: var(--ds-surface);
  box-shadow: none;
  font-weight: 650;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition:
    color var(--ds-duration-fast) var(--ds-ease-standard),
    background-color var(--ds-duration-fast) var(--ds-ease-standard),
    border-color var(--ds-duration-fast) var(--ds-ease-standard),
    box-shadow var(--ds-duration-fast) var(--ds-ease-standard),
    transform var(--ds-duration-fast) var(--ds-ease-standard);
}

button:hover:not(:disabled),
.button-link:hover,
.button-secondary:hover:not(:disabled) {
  border-color: #8fa0b3;
  background: var(--ds-surface-subtle);
}

button:active:not(:disabled),
.button-link:active {
  transform: translateY(1px);
}

button.primary,
.button-primary {
  border-color: var(--ds-brand);
  color: var(--ds-on-brand);
  background: var(--ds-brand);
}

button.primary:hover:not(:disabled),
.button-primary:hover:not(:disabled) {
  border-color: var(--ds-brand-hover);
  color: var(--ds-on-brand);
  background: var(--ds-brand-hover);
}

button.primary:active:not(:disabled),
.button-primary:active:not(:disabled) {
  border-color: var(--ds-brand-pressed);
  background: var(--ds-brand-pressed);
}

.button-secondary {
  border-color: var(--ds-border-strong);
  color: var(--ds-text);
  background: var(--ds-surface);
}

.button-ghost {
  border-color: transparent;
  color: var(--ds-text-secondary);
  background: transparent;
}

.button-ghost:hover:not(:disabled) {
  border-color: transparent;
  color: var(--ds-text);
  background: rgba(15, 23, 42, 0.055);
}

.danger-button {
  border-color: var(--ds-error);
  color: #ffffff;
  background: var(--ds-error);
}

.danger-button:hover:not(:disabled) {
  border-color: var(--ds-error-hover);
  color: #ffffff;
  background: var(--ds-error-hover);
}

button:disabled,
.button-link[aria-disabled="true"] {
  cursor: not-allowed;
  border-color: #c9d1dc;
  color: var(--ds-text-disabled);
  background: var(--ds-surface-disabled);
  box-shadow: none;
  opacity: 1;
  transform: none;
}

button:focus-visible,
a:focus-visible,
summary:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--ds-focus);
  outline-offset: 3px;
  box-shadow: var(--ds-focus-ring);
}

input,
select,
textarea {
  min-width: 0;
  width: 100%;
  border: var(--ds-border-width) solid var(--ds-border-strong);
  border-radius: var(--ds-radius-md);
  color: var(--ds-text);
  background: var(--ds-surface);
  box-shadow: none;
  transition:
    border-color var(--ds-duration-fast) var(--ds-ease-standard),
    box-shadow var(--ds-duration-fast) var(--ds-ease-standard),
    background-color var(--ds-duration-fast) var(--ds-ease-standard);
}

input,
select {
  min-height: var(--ds-touch-min);
  padding: 0 var(--ds-space-3);
}

textarea {
  min-height: 120px;
  padding: var(--ds-space-3);
  line-height: var(--ds-leading-body);
  resize: vertical;
}

input::placeholder,
textarea::placeholder {
  color: var(--ds-text-muted);
  opacity: 1;
}

input:disabled,
select:disabled,
textarea:disabled {
  color: var(--ds-text-disabled);
  background: var(--ds-surface-disabled);
  opacity: 1;
}

input[aria-invalid="true"],
select[aria-invalid="true"],
textarea[aria-invalid="true"] {
  border-color: var(--ds-error);
}

.panel,
.quiz-card,
.result-panel,
.dashboard-card,
.module-card,
.tool-category-card,
.tool-shelf,
.workflow-editor,
.finance-card,
.admin-user-card,
.admin-login-card,
.trial-workbench {
  border-color: var(--ds-border);
  border-radius: var(--ds-radius-md);
  color: var(--ds-text);
  background: var(--ds-surface);
  box-shadow: var(--ds-shadow-card);
}

.modal-layer {
  padding:
    max(var(--ds-space-4), env(safe-area-inset-top))
    max(var(--ds-space-4), env(safe-area-inset-right))
    max(var(--ds-space-4), env(safe-area-inset-bottom))
    max(var(--ds-space-4), env(safe-area-inset-left));
  background: rgba(15, 23, 42, 0.52);
  backdrop-filter: blur(3px);
  animation: dsModalBackdropIn var(--ds-duration-fast) ease-out both;
}

.modal-layer.is-closing {
  animation: dsModalBackdropOut var(--ds-duration-fast) ease-out both;
}

.modal-panel {
  max-height: calc(100dvh - 32px);
  overflow: auto;
  border: var(--ds-border-width) solid var(--ds-border);
  border-radius: var(--ds-radius-lg);
  color: var(--ds-text);
  background: var(--ds-surface-raised);
  box-shadow: var(--ds-shadow-dialog);
  animation: dsModalPanelIn var(--ds-duration-fast) ease-out both;
}

.modal-layer.is-closing .modal-panel {
  animation: dsModalPanelOut var(--ds-duration-fast) ease-out both;
}

@keyframes dsModalBackdropIn {
  from { background-color: rgba(15, 23, 42, 0.42); }
  to { background-color: rgba(15, 23, 42, 0.52); }
}

@keyframes dsModalBackdropOut {
  from { background-color: rgba(15, 23, 42, 0.52); }
  to { background-color: rgba(15, 23, 42, 0.42); }
}

@keyframes dsModalPanelIn {
  from { transform: translateY(8px) scale(0.99); }
  to { transform: translateY(0) scale(1); }
}

@keyframes dsModalPanelOut {
  from { transform: translateY(0) scale(1); }
  to { transform: translateY(8px) scale(0.99); }
}

.tabs,
.admin-tabs,
.feedback-tabs,
.wrong-book-tabs {
  border-color: var(--ds-border);
  border-radius: var(--ds-radius-md);
  background: var(--ds-surface-subtle);
}

.tabs button,
.admin-tabs button,
.feedback-tabs button,
.wrong-book-tabs button {
  color: var(--ds-text-secondary);
}

.tabs button.active,
.admin-tabs button.active,
.feedback-tabs button.active,
.wrong-book-tabs button.active,
[role="tab"][aria-selected="true"] {
  color: var(--ds-brand-hover);
  background: var(--ds-surface);
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.08);
}

.status-badge,
.local-only-badge,
.membership-badge {
  min-height: 28px;
  display: inline-flex;
  align-items: center;
  padding: 0 var(--ds-space-3);
  border: 1px solid var(--ds-border);
  border-radius: var(--ds-radius-pill);
  color: var(--ds-text-secondary);
  background: var(--ds-surface-subtle);
  font-size: var(--ds-text-xs);
  font-weight: 700;
}

[data-tone="success"],
.status-success {
  border-color: #abd9bf;
  color: var(--ds-success);
  background: var(--ds-success-soft);
}

[data-tone="warning"],
.status-warning {
  border-color: #ebcf93;
  color: var(--ds-warning);
  background: var(--ds-warning-soft);
}

[data-tone="error"],
.status-error,
.login-failed {
  border-color: #edb2b2;
  color: var(--ds-error);
  background: var(--ds-error-soft);
}

.dashboard-empty,
.admin-empty-state,
.tool-empty-state,
.empty-state {
  min-height: 120px;
  display: grid;
  place-items: center;
  padding: var(--ds-space-6);
  border: 1px dashed var(--ds-border-strong);
  border-radius: var(--ds-radius-md);
  color: var(--ds-text-muted);
  background: var(--ds-surface-subtle);
  text-align: center;
}

.loading-state,
.skeleton {
  position: relative;
  overflow: hidden;
  color: var(--ds-text-muted);
  background: #e8edf3;
}

.skeleton::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg, transparent 20%, rgba(255, 255, 255, 0.62) 50%, transparent 80%);
  transform: translateX(-100%);
  animation: dsSkeleton 1.4s var(--ds-ease-standard) infinite;
}

@keyframes dsSkeleton {
  to { transform: translateX(100%); }
}

table {
  width: 100%;
  border-collapse: collapse;
  color: var(--ds-text);
  background: var(--ds-surface);
}

th,
td {
  padding: var(--ds-space-3) var(--ds-space-4);
  border-bottom: 1px solid var(--ds-border);
  text-align: left;
  vertical-align: top;
}

th {
  color: var(--ds-text-secondary);
  background: var(--ds-surface-subtle);
  font-size: var(--ds-text-sm);
  font-weight: 750;
}

.section-kicker {
  color: var(--ds-brand-hover);
  font-size: var(--ds-text-xs);
  font-weight: 800;
  letter-spacing: 0;
  text-transform: none;
}

.meta-line,
.local-processing-note,
.admin-date-help,
.admin-editor-subtitle,
small {
  color: var(--ds-text-muted);
  opacity: 1;
}

.danger-text {
  color: var(--ds-error) !important;
}

@media (max-width: 760px) {
  :root {
    --ds-text-display: 42px;
    --ds-text-2xl: 26px;
    --ds-text-xl: 20px;
  }

  .modal-layer {
    align-items: flex-end;
    padding: max(8px, env(safe-area-inset-top)) 0 0;
  }

  .modal-panel {
    width: 100%;
    max-height: calc(100dvh - max(8px, env(safe-area-inset-top)));
    border-right: 0;
    border-bottom: 0;
    border-left: 0;
    border-radius: var(--ds-radius-lg) var(--ds-radius-lg) 0 0;
    padding-bottom: max(var(--ds-space-5), env(safe-area-inset-bottom));
  }

  th,
  td {
    padding: var(--ds-space-3);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 1ms !important;
  }
}