/**
 * METAMI Learning OS — global visual system V2.
 * Light-first, local-only theme persistence, neutral charcoal dark mode.
 */

:root {
  color-scheme: light;

  /* Global semantic tokens */
  --page-bg: #F6F5F1;
  --surface: #FFFDF9;
  --surface-muted: #EEF3F0;
  --surface-raised: #FFFFFF;
  --text-primary: #252B2B;
  --text-secondary: #4E5D5B;
  --text-soft: #6B7775;
  --border: #D9E1DE;
  --border-strong: #B8C7C3;
  --brand: #1F625F;
  --brand-hover: #174D4B;
  --accent-coral: #D85F48;
  --accent-coral-hover: #B94733;
  --accent-yellow: #E5A72F;
  --accent-green: #4F7D62;
  --focus-ring: #B94D38;
  --shadow: 0 14px 38px rgba(37, 43, 43, 0.08);
  --shadow-soft: 0 5px 18px rgba(37, 43, 43, 0.06);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 22px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;
  --space-12: 48px;
  --space-16: 64px;
  --space-24: 96px;
  --content-max: 1240px;
  --reading-max: 740px;
  --transition-fast: 160ms cubic-bezier(0.2, 0, 0, 1);
  --transition-normal: 220ms cubic-bezier(0.2, 0, 0, 1);

  /* Compatibility mappings used by existing product routes */
  --color-bg: var(--page-bg);
  --color-bg-alt: var(--surface-muted);
  --color-surface: var(--surface);
  --color-card-bg: var(--surface-raised);
  --color-card-border: var(--border);
  --color-header-bg: rgba(246, 245, 241, 0.94);
  --color-header-border: rgba(184, 199, 195, 0.55);
  --color-primary: var(--brand);
  --color-primary-dark: var(--brand-hover);
  --color-primary-light: #DCE9E6;
  --color-primary-subtle: #EAF1EF;
  --color-coral: var(--accent-coral);
  --color-coral-dark: var(--accent-coral-hover);
  --color-coral-light: #F9E9E4;
  --color-yellow: var(--accent-yellow);
  --color-yellow-dark: #B8780D;
  --color-yellow-light: #FBF2DD;
  --color-yellow-tint: #F8EACA;
  --color-amber: #D78131;
  --color-amber-light: #F8EADC;
  --color-text-main: var(--text-primary);
  --color-text-title: var(--text-primary);
  --color-text-body: var(--text-secondary);
  --color-text-muted: var(--text-soft);
  --color-line-stroke: var(--border-strong);
  --text-heading: var(--text-primary);
  --text-body: var(--text-secondary);
  --text-muted: var(--text-soft);
  --text-accent: var(--accent-coral);
  --text-child-reading: #222827;
  --surface-reading-card: var(--surface-raised);
  --surface-reading-panel: #F0F4F2;
  --surface-stimulus-wrap: #F0F4F2;
  --shadow-card: var(--shadow-soft);
  --shadow-sm: 0 2px 8px rgba(37, 43, 43, 0.06);
  --shadow-md: var(--shadow);

  /* Publication aliases */
  --mt-bg: var(--page-bg);
  --mt-surface: var(--surface-raised);
  --mt-text: var(--text-primary);
  --mt-text-muted: var(--text-secondary);
  --mt-border: var(--border);
  --mt-teal-700: var(--brand);
  --mt-coral: var(--accent-coral);
  --mt-coral-700: #A83D2C;
}

html[data-theme="dark"],
html[data-color-scheme="dark"] {
  color-scheme: dark;
  --page-bg: #171A1B;
  --surface: #1F2425;
  --surface-muted: #222829;
  --surface-raised: #272D2E;
  --text-primary: #F2F0EA;
  --text-secondary: #D4D8D4;
  --text-soft: #ADB8B4;
  --border: #343D3E;
  --border-strong: #4B5858;
  --brand: #70B9AF;
  --brand-hover: #8CCBC2;
  --accent-coral: #E27A63;
  --accent-coral-hover: #F0927D;
  --accent-yellow: #DDB45B;
  --accent-green: #7FA489;
  --focus-ring: #F0B45C;
  --shadow: 0 14px 38px rgba(0, 0, 0, 0.24);
  --shadow-soft: 0 4px 16px rgba(0, 0, 0, 0.18);

  --color-bg: var(--page-bg);
  --color-bg-alt: var(--surface-muted);
  --color-surface: var(--surface);
  --color-card-bg: var(--surface-raised);
  --color-card-border: var(--border);
  --color-header-bg: rgba(23, 26, 27, 0.94);
  --color-header-border: rgba(75, 88, 88, 0.52);
  --color-primary: var(--brand);
  --color-primary-dark: var(--brand-hover);
  --color-primary-light: #263A39;
  --color-primary-subtle: #202E2D;
  --color-coral: var(--accent-coral);
  --color-coral-dark: var(--accent-coral-hover);
  --color-coral-light: #3A2622;
  --color-yellow: var(--accent-yellow);
  --color-yellow-dark: #E9C779;
  --color-yellow-light: #342E21;
  --color-yellow-tint: #2C281D;
  --color-amber: #D89455;
  --color-amber-light: #342A22;
  --color-text-main: var(--text-primary);
  --color-text-body: var(--text-secondary);
  --color-text-muted: var(--text-soft);
  --color-text-title: var(--text-primary);
  --color-line-stroke: var(--border-strong);
  --text-heading-dark: var(--text-primary);
  --text-body-dark: var(--text-secondary);
  --text-muted-dark: var(--text-soft);
  --text-accent-dark: var(--accent-coral);
  --text-child-reading-dark: #E7E5DF;
  --text-heading: var(--text-primary);
  --text-body: var(--text-secondary);
  --text-muted: var(--text-soft);
  --text-accent: var(--accent-coral);
  --text-child-reading: var(--text-child-reading-dark);
  --surface-reading-card: var(--surface-raised);
  --surface-reading-panel: #242B2C;
  --surface-stimulus-wrap: #1C2122;
  --shadow-card: var(--shadow-soft);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.18);
  --shadow-md: var(--shadow);
}

html { background: var(--page-bg); }
body { background: var(--page-bg); color: var(--text-primary); }

*:focus-visible {
  outline: 3px solid var(--focus-ring) !important;
  outline-offset: 3px;
}

button, input, select, textarea { font: inherit; }
button, [role="button"], a { -webkit-tap-highlight-color: transparent; }

/* Sticky Headers Theme Synchronization */
.site-header,
.sm-header,
.lr-header,
.cp-header,
.app-header {
  background: var(--color-header-bg, rgba(255, 253, 248, 0.94)) !important;
  border-bottom-color: var(--color-header-border, rgba(196, 220, 217, 0.5)) !important;
}

html[data-theme="dark"] .site-header .nav-link,
html[data-color-scheme="dark"] .site-header .nav-link {
  color: var(--color-text-main, #E8F7F4);
}

html[data-theme="dark"] .site-header .nav-link:hover,
html[data-color-scheme="dark"] .site-header .nav-link:hover {
  color: var(--color-coral, #D96B54);
}

html[data-theme="dark"] .site-header .brand-name,
html[data-color-scheme="dark"] .site-header .brand-name {
  color: var(--color-primary, #5BB5A8);
}

html[data-theme="dark"] .hero-visual-card,
html[data-color-scheme="dark"] .hero-visual-card {
  background: var(--color-surface, #173238);
  border-color: var(--color-card-border, #294D56);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4);
}

/* Child Reading Surface & Passage Rules in Dark Mode */
html[data-theme="dark"] .passage-container,
html[data-color-scheme="dark"] .passage-container {
  background: var(--surface-reading-panel, #1B3B42) !important;
  border-color: var(--color-card-border, #294D56) !important;
}

html[data-theme="dark"] .passage-body,
html[data-color-scheme="dark"] .passage-body {
  color: var(--text-child-reading, #DFECE9) !important;
  line-height: var(--line-height-thai, 1.8);
  font-weight: 400;
}

html[data-theme="dark"] .passage-title,
html[data-color-scheme="dark"] .passage-title {
  color: var(--text-heading, #E8F7F4) !important;
  background: var(--color-primary-light, #1D414A) !important;
}

html[data-theme="dark"] .passage-sentence.interactive-clickable:hover,
html[data-color-scheme="dark"] .passage-sentence.interactive-clickable:hover {
  background: rgba(91, 181, 168, 0.25) !important;
}

html[data-theme="dark"] .passage-sentence.selected-evidence,
html[data-color-scheme="dark"] .passage-sentence.selected-evidence {
  background: rgba(235, 176, 66, 0.22) !important;
  border-bottom: 3px solid var(--color-yellow, #EBB042) !important;
  color: #FFF4D6 !important;
}

/* Instruction & Hint Boxes in Dark Mode */
html[data-theme="dark"] .instruction-box,
html[data-color-scheme="dark"] .instruction-box,
html[data-theme="dark"] .parent-hint-box,
html[data-color-scheme="dark"] .parent-hint-box {
  background: var(--color-yellow-light, #342A16) !important;
  border-left-color: var(--color-yellow, #EBB042) !important;
  color: var(--text-heading, #E8F7F4) !important;
}

/* Secondary Button on Dark Mode */
html[data-theme="dark"] .btn-hero-secondary,
html[data-color-scheme="dark"] .btn-hero-secondary {
  background: rgba(91, 181, 168, 0.12) !important;
  color: var(--color-primary, #5BB5A8) !important;
  border-color: var(--color-primary, #5BB5A8) !important;
}

html[data-theme="dark"] .btn-hero-secondary:hover,
html[data-color-scheme="dark"] .btn-hero-secondary:hover {
  background: rgba(91, 181, 168, 0.22) !important;
  color: var(--color-primary-dark, #76C7BC) !important;
}

/* Hero Elements in Dark Mode */
html[data-theme="dark"] .hero-title,
html[data-color-scheme="dark"] .hero-title {
  color: var(--text-heading, #E8F7F4);
}

html[data-theme="dark"] .hero-title span.highlight,
html[data-color-scheme="dark"] .hero-title span.highlight {
  color: var(--color-coral, #D96B54);
}

html[data-theme="dark"] .hero-sub,
html[data-color-scheme="dark"] .hero-sub {
  color: var(--text-body, #D8E5E2);
}

html[data-theme="dark"] .hero-trust-points,
html[data-color-scheme="dark"] .hero-trust-points {
  color: var(--text-muted, #95B2AE);
}

html[data-theme="dark"] .hero-badge,
html[data-color-scheme="dark"] .hero-badge {
  background: var(--color-yellow-light, #342A16);
  border-color: var(--color-yellow, #EBB042);
  color: var(--color-yellow-dark, #F4C468);
}

/* Stimulus SVGs & Puzzle Areas in Dark Mode */
html[data-theme="dark"] .cp-game-stimulus-wrap,
html[data-color-scheme="dark"] .cp-game-stimulus-wrap,
html[data-theme="dark"] .lr-task-visual-wrap,
html[data-color-scheme="dark"] .lr-task-visual-wrap,
html[data-theme="dark"] .visual-anchor-wrap,
html[data-color-scheme="dark"] .visual-anchor-wrap {
  background: var(--surface-stimulus-wrap, #122429) !important;
  border-color: var(--color-card-border, #294D56) !important;
}

/* Base Body smooth theme transition */
body {
  transition: background-color 0.25s ease, color 0.25s ease;
}

/* ==========================================================================
   Unified Settings Modal Dialog
   ========================================================================== */
.metami-modal-dialog {
  border: none;
  border-radius: 20px;
  padding: 0;
  max-width: 540px;
  width: calc(100vw - 32px);
  background: var(--color-surface, #FFFFFF);
  color: var(--color-text-body, #2C3333);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  margin: auto;
  position: fixed;
  inset: 0;
  z-index: 1000;
}

.metami-modal-dialog::backdrop {
  background: rgba(13, 28, 32, 0.7);
  backdrop-filter: blur(4px);
}

.metami-modal-content {
  padding: 24px 28px;
  max-height: 85vh;
  overflow-y: auto;
}

.metami-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--color-card-border, #DCECE9);
  padding-bottom: 16px;
  margin-bottom: 20px;
}

.metami-modal-title-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
}

.metami-modal-icon {
  font-size: 22px;
}

.metami-modal-title {
  font-family: var(--font-family-heading, 'Mitr', sans-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary-dark, #1F4E5B);
  margin: 0;
}

.metami-modal-close {
  background: transparent;
  border: none;
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text-muted, #5F7573);
  cursor: pointer;
  padding: 6px 10px;
  border-radius: 50%;
  transition: background 0.15s ease, color 0.15s ease;
}

.metami-modal-close:hover {
  background: var(--color-primary-subtle, #EAF4F3);
  color: var(--color-coral, #D6553B);
}

.metami-setting-section {
  margin-bottom: 24px;
}

.metami-setting-label {
  font-family: var(--font-family-heading, 'Mitr', sans-serif);
  font-size: 15px;
  font-weight: 700;
  color: var(--color-primary, #1F4E5B);
  margin-bottom: 10px;
}

/* Theme radio buttons row */
.metami-theme-options {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.metami-theme-btn {
  display: block;
  cursor: pointer;
}

.metami-theme-btn input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.metami-theme-btn-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 12px 8px;
  background: var(--color-bg-alt, #F9F6F0);
  border: 2px solid var(--color-card-border, #DCECE9);
  border-radius: 12px;
  transition: border-color 0.15s ease, background 0.15s ease, transform 0.15s ease;
  text-align: center;
  gap: 4px;
}

.metami-theme-btn:hover .metami-theme-btn-content {
  border-color: var(--color-primary, #1F4E5B);
}

.metami-theme-btn input:checked + .metami-theme-btn-content {
  border-color: var(--color-primary, #1F4E5B);
  background: var(--color-primary-subtle, #EAF4F3);
  box-shadow: 0 2px 8px rgba(31, 78, 91, 0.15);
}

.metami-theme-btn-icon {
  font-size: 20px;
}

.metami-theme-btn-text {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-main, #222A29);
}

/* Switch toggle row */
.metami-toggle-row {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  padding: 10px 14px;
  background: var(--color-bg-alt, #F9F6F0);
  border: 1px solid var(--color-card-border, #DCECE9);
  border-radius: 12px;
}

.metami-toggle-input {
  width: 20px;
  height: 20px;
  accent-color: var(--color-primary, #1F4E5B);
  cursor: pointer;
}

.metami-toggle-text {
  font-size: 14.5px;
  color: var(--color-text-body, #2C3333);
  font-weight: 500;
}

/* Voice details wrap */
.metami-voice-details {
  margin-top: 14px;
  padding: 14px 16px;
  background: var(--color-bg-alt, #F9F6F0);
  border: 1px solid var(--color-card-border, #DCECE9);
  border-radius: 12px;
}

.metami-voice-source-info {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  font-size: 13px;
}

.metami-voice-source-tag {
  font-weight: 700;
  color: var(--color-primary, #1F4E5B);
}

.metami-voice-source-desc {
  color: var(--color-text-muted, #5F7573);
}

.metami-field-group {
  margin-bottom: 12px;
}

.metami-field-label {
  display: block;
  font-size: 13.5px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--color-text-main, #222A29);
}

.metami-select-voice {
  width: 100%;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1.5px solid var(--color-card-border, #DCECE9);
  background: var(--color-surface, #FFFFFF);
  color: var(--color-text-body, #2C3333);
  font-family: inherit;
  font-size: 14px;
}

.metami-btn-sample {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 999px;
  background: var(--color-primary-subtle, #EAF4F3);
  border: 1.5px solid var(--color-primary, #1F4E5B);
  color: var(--color-primary-dark, #153842);
  font-family: inherit;
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.15s ease;
}

.metami-btn-sample:hover {
  background: var(--color-primary-light, #C4DCD9);
  transform: translateY(-1px);
}

.metami-voice-footnote {
  font-size: 12.5px;
  color: var(--color-text-muted, #5F7573);
  margin-top: 10px;
  line-height: 1.5;
}

/* Header utility button */
.metami-header-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border-radius: 999px;
  background: var(--color-surface, #FFFFFF);
  border: 1.5px solid var(--color-card-border, #DCECE9);
  color: var(--color-primary, #1F4E5B);
  font-family: var(--font-family-heading, 'Mitr', sans-serif);
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.metami-header-btn:hover {
  border-color: var(--color-primary, #1F4E5B);
  background: var(--color-primary-subtle, #EAF4F3);
  transform: translateY(-1px);
}

/* V2 shared shell and cross-route surface inheritance */
.site-header,
.sm-header,
.lr-header,
.cp-header,
.app-header,
.pub-header,
.games-header {
  min-height: 68px;
  color: var(--text-primary);
  background: var(--color-header-bg) !important;
  border-bottom: 1px solid var(--color-header-border) !important;
  box-shadow: none !important;
  backdrop-filter: blur(16px);
}

.brand-name,
.sm-brand-name,
.lr-brand-name,
.cp-brand-name,
.brand-title,
.pub-brand,
.games-brand-name {
  color: var(--text-primary) !important;
  font-family: var(--font-family-heading, 'Mitr', sans-serif);
  font-weight: 600 !important;
  letter-spacing: -0.01em;
}

.metami-header-btn {
  width: 44px;
  min-width: 44px;
  height: 44px;
  justify-content: center;
  padding: 0;
  border-radius: var(--radius-sm);
  border-width: 1px;
  color: var(--text-secondary);
  background: var(--surface);
}

.metami-header-btn .utility-label,
.metami-header-btn .metami-settings-label { display: none; }

.metami-modal-dialog {
  border-radius: var(--radius-lg);
  background: var(--surface-raised);
  color: var(--text-primary);
  box-shadow: var(--shadow);
}

.metami-modal-dialog::backdrop { background: rgba(17, 20, 20, 0.56); }
.metami-modal-title { font-weight: 600; }
.metami-modal-icon { color: var(--accent-coral); letter-spacing: 0.12em; }
.metami-setting-section { background: transparent; }
.metami-setting-label { color: var(--text-primary); font-weight: 600; }
.metami-theme-hint {
  margin: 10px 0 0;
  color: var(--text-soft);
  font-size: 13px;
  line-height: 1.65;
}
.metami-theme-btn-content {
  min-height: 54px;
  border-radius: var(--radius-sm);
  background: var(--surface-muted);
  border-color: var(--border);
}
.metami-theme-btn input:checked + .metami-theme-btn-content {
  color: var(--text-primary);
  background: var(--surface-raised);
  border-color: var(--brand);
  box-shadow: 0 0 0 1px var(--brand);
}

.sm-card,
.sm-intro-card,
.sm-panel,
.lr-card,
.lr-panel,
.cp-card,
.cp-panel,
.pub-card,
.boundary,
.disclosure,
.router,
.passage-container,
.activity-card,
.page-card {
  color: var(--text-primary);
  background: var(--surface-raised) !important;
  border-color: var(--border) !important;
  box-shadow: var(--shadow-soft) !important;
}

input, select, textarea {
  color: var(--text-primary);
  background: var(--surface-raised);
  border-color: var(--border-strong);
}

html[data-color-scheme="dark"] .site-footer,
html[data-color-scheme="dark"] .pub-footer,
html[data-color-scheme="dark"] .sm-footer,
html[data-color-scheme="dark"] .lr-footer,
html[data-color-scheme="dark"] .cp-footer {
  color: var(--text-secondary);
  background: #121516 !important;
  border-color: var(--border) !important;
}

@media (max-width: 560px) {
  .metami-modal-content { padding: 20px; }
  .metami-theme-options { grid-template-columns: 1fr; }
  .metami-theme-btn-content { min-height: 48px; }
}

/* Mute toggle button icon */
.metami-btn-icon-only {
  width: 38px;
  height: 38px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
}

@media print {
  :root, html[data-theme="dark"] {
    color-scheme: light;
    --page-bg: #FFFFFF !important;
    --surface: #FFFFFF !important;
    --surface-raised: #FFFFFF !important;
    --text-primary: #000000 !important;
    --text-secondary: #2C3333 !important;
    --color-bg: #FFFFFF !important;
    --color-bg-alt: #FFFFFF !important;
    --color-surface: #FFFFFF !important;
    --color-card-bg: #FFFFFF !important;
    --color-text-main: #000000 !important;
    --color-text-body: #2C3333 !important;
  }
  .metami-modal-dialog, .metami-header-btn {
    display: none !important;
  }
}