/* ============================================================================
   IELTSMaster · Global Liquid Glass Design & Fluid Motion System (styles.css)
   - Refractive Translucent Glass Surfaces, Specular Edge Highlights, Ambient Mesh
   - Full-Lifecycle Spring & Spatial Transition Physics on Every User Interaction
   ============================================================================ */

:root {
  /* Core Brand & Semantic Accents */
  --accent: #0d9488;
  --accent-strong: #0f766e;
  --accent-glow: rgba(13, 148, 136, 0.22);
  --accent-tint: rgba(13, 148, 136, 0.11);

  --danger: #e11d48;
  --danger-tint: rgba(225, 29, 72, 0.11);
  --success: #059669;
  --success-tint: rgba(5, 150, 105, 0.12);
  --warning: #d97706;
  --warning-tint: rgba(217, 119, 6, 0.12);

  /* Global Liquid Glass Material Tokens (Light Mode) */
  --bg-canvas: #eef2f6;
  --glass-bg: rgba(255, 255, 255, 0.56);
  --glass-bg-elevated: rgba(255, 255, 255, 0.72);
  --glass-bg-subtle: rgba(255, 255, 255, 0.38);
  --glass-bg-hover: rgba(255, 255, 255, 0.84);
  --glass-bg-input: rgba(255, 255, 255, 0.64);
  --glass-popover-bg: rgba(255, 255, 255, 0.84);

  --glass-border: rgba(255, 255, 255, 0.74);
  --glass-border-subtle: rgba(15, 23, 42, 0.08);
  --glass-specular: rgba(255, 255, 255, 0.88);
  --glass-rim: inset 0 1px 0 0 var(--glass-specular), inset 0 0 0 0.5px rgba(255, 255, 255, 0.45);

  --shadow-glass-sm: 0 4px 16px -2px rgba(15, 23, 42, 0.05), var(--glass-rim);
  --shadow-glass-md: 0 10px 32px -6px rgba(15, 23, 42, 0.07), var(--glass-rim);
  --shadow-glass-lg: 0 20px 48px -10px rgba(15, 23, 42, 0.14), var(--glass-rim);

  --blur-std: blur(26px) saturate(185%);
  --blur-heavy: blur(36px) saturate(200%);

  /* Typography Colors */
  --text-main: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;

  /* Radii & Spacing */
  --radius-xs: 8px;
  --radius-sm: 11px;
  --radius-md: 16px;
  --radius-lg: 22px;
  --radius-pill: 999px;

  /* Apple-Grade Fluid Motion & Spring Curves */
  --ease-spring: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-smooth: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-quart: cubic-bezier(0.165, 0.84, 0.44, 1);

  --passage-font-size: 16px;
  --passage-line-height: 1.82;
  color-scheme: light;
}

/* Dark Liquid Glass Mode */
html[data-theme="dark"],
body.theme-dark {
  --bg-canvas: #090d16;
  --accent: #2dd4bf;
  --accent-strong: #14b8a6;
  --accent-glow: rgba(45, 212, 191, 0.24);
  --accent-tint: rgba(45, 212, 191, 0.14);

  --danger: #fb7185;
  --danger-tint: rgba(251, 113, 133, 0.15);
  --success: #34d399;
  --success-tint: rgba(52, 211, 153, 0.15);
  --warning: #fbbf24;
  --warning-tint: rgba(251, 191, 36, 0.15);

  --glass-bg: rgba(17, 24, 39, 0.58);
  --glass-bg-elevated: rgba(30, 41, 59, 0.68);
  --glass-bg-subtle: rgba(15, 23, 42, 0.42);
  --glass-bg-hover: rgba(30, 41, 59, 0.86);
  --glass-bg-input: rgba(15, 23, 42, 0.62);
  --glass-popover-bg: rgba(15, 23, 42, 0.86);

  --glass-border: rgba(255, 255, 255, 0.12);
  --glass-border-subtle: rgba(255, 255, 255, 0.08);
  --glass-specular: rgba(255, 255, 255, 0.18);
  --glass-rim: inset 0 1px 0 0 var(--glass-specular), inset 0 0 0 0.5px rgba(255, 255, 255, 0.08);

  --shadow-glass-sm: 0 4px 18px -2px rgba(0, 0, 0, 0.35), var(--glass-rim);
  --shadow-glass-md: 0 12px 36px -6px rgba(0, 0, 0, 0.45), var(--glass-rim);
  --shadow-glass-lg: 0 24px 56px -10px rgba(0, 0, 0, 0.65), var(--glass-rim);

  --text-main: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  color-scheme: dark;
}

/* Warm Sepia Liquid Glass Mode (for Reading comfort) */
body.theme-sepia {
  --bg-canvas: #ede6d6;
  --glass-bg: rgba(251, 247, 238, 0.65);
  --glass-bg-elevated: rgba(253, 250, 243, 0.78);
  --glass-bg-subtle: rgba(245, 238, 224, 0.48);
  --glass-bg-hover: rgba(253, 250, 243, 0.9);
  --glass-bg-input: rgba(255, 252, 245, 0.72);
  --glass-popover-bg: rgba(252, 248, 239, 0.88);
  --text-main: #2c221e;
  --text-secondary: #5c4b43;
  --text-muted: #847268;
}

body.font-sm { --passage-font-size: 14px; --passage-line-height: 1.68; }
body.font-md { --passage-font-size: 16px; --passage-line-height: 1.82; }
body.font-lg { --passage-font-size: 18px; --passage-line-height: 1.92; }
body.font-xl { --passage-font-size: 20px; --passage-line-height: 2.02; }

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Inter", sans-serif;
  background-color: var(--bg-canvas);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.42s var(--ease-smooth), color 0.32s var(--ease-smooth);
}

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

/* ============================================================================
   AMBIENT LIQUID LIGHT CANVAS & ORGANIC REFRACTION CHOREOGRAPHY
   ============================================================================ */
.ambient-canvas {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  overflow: hidden;
  background:
    radial-gradient(circle at 12% 16%, rgba(45, 212, 191, 0.16), transparent 42%),
    radial-gradient(circle at 86% 18%, rgba(56, 189, 248, 0.15), transparent 45%),
    radial-gradient(circle at 52% 84%, rgba(99, 102, 241, 0.11), transparent 48%);
  transition: background 0.5s var(--ease-smooth);
}

html[data-theme="dark"] .ambient-canvas,
body.theme-dark .ambient-canvas {
  background:
    radial-gradient(circle at 15% 18%, rgba(13, 148, 136, 0.22), transparent 45%),
    radial-gradient(circle at 84% 22%, rgba(30, 64, 175, 0.24), transparent 48%),
    radial-gradient(circle at 50% 85%, rgba(15, 118, 110, 0.16), transparent 50%);
}

.ambient-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(70px);
  opacity: 0.58;
  will-change: transform;
}

.orb-1 {
  width: 480px;
  height: 480px;
  top: -120px;
  left: -80px;
  background: radial-gradient(circle, rgba(20, 184, 166, 0.24), transparent 70%);
  animation: orbDrift1 22s ease-in-out infinite alternate;
}

.orb-2 {
  width: 540px;
  height: 540px;
  top: 15%;
  right: -140px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.2), transparent 70%);
  animation: orbDrift2 26s ease-in-out infinite alternate;
}

.orb-3 {
  width: 500px;
  height: 500px;
  bottom: -160px;
  left: 28%;
  background: radial-gradient(circle, rgba(16, 185, 129, 0.18), transparent 70%);
  animation: orbDrift3 24s ease-in-out infinite alternate;
}

@keyframes orbDrift1 {
  0% { transform: translate3d(0, 0, 0) scale(1); }
  100% { transform: translate3d(55px, 38px, 0) scale(1.08); }
}

@keyframes orbDrift2 {
  0% { transform: translate3d(0, 0, 0) scale(1); }
  100% { transform: translate3d(-48px, 42px, 0) scale(1.06); }
}

@keyframes orbDrift3 {
  0% { transform: translate3d(0, 0, 0) scale(1); }
  100% { transform: translate3d(36px, -45px, 0) scale(1.07); }
}

/* ============================================================================
   UNIVERSAL LIQUID GLASS PRIMITIVES & CONTROLS
   ============================================================================ */
.glass-surface {
  background: var(--glass-bg);
  backdrop-filter: var(--blur-std);
  -webkit-backdrop-filter: var(--blur-std);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-glass-md);
  transition: background 0.32s var(--ease-smooth), border-color 0.32s var(--ease-smooth), box-shadow 0.32s var(--ease-smooth);
}

.glass-card {
  background: var(--glass-bg);
  backdrop-filter: var(--blur-std);
  -webkit-backdrop-filter: var(--blur-std);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-glass-md);
  padding: 20px 22px;
  transition:
    transform 0.32s var(--ease-spring),
    box-shadow 0.32s var(--ease-spring),
    background 0.28s var(--ease-smooth),
    border-color 0.28s var(--ease-smooth),
    opacity 0.28s var(--ease-smooth);
}

/* Universal Liquid Glass Button */
.glass-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 34px;
  padding: 0 14px;
  border-radius: var(--radius-pill);
  font-size: 13px;
  font-weight: 560;
  color: var(--text-main);
  background: var(--glass-bg-elevated);
  backdrop-filter: var(--blur-std);
  -webkit-backdrop-filter: var(--blur-std);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-glass-sm);
  cursor: pointer;
  white-space: nowrap;
  user-select: none;
  transition:
    transform 0.24s var(--ease-bounce),
    background 0.22s var(--ease-smooth),
    border-color 0.22s var(--ease-smooth),
    color 0.2s var(--ease-smooth),
    box-shadow 0.24s var(--ease-smooth),
    filter 0.22s var(--ease-smooth);
}

.glass-btn svg {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
  transition: transform 0.24s var(--ease-spring);
}

.glass-btn.back-btn:hover svg {
  transform: translateX(-2.5px);
}

.glass-btn:hover:not(:disabled) {
  background: var(--glass-bg-hover);
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
  box-shadow: 0 6px 18px -4px var(--accent-glow), var(--glass-rim);
}

.glass-btn:active:not(:disabled) {
  transform: scale(0.95) translateY(0);
  transition-duration: 0.1s;
}

.glass-btn:disabled {
  opacity: 0.42;
  cursor: not-allowed;
}

.glass-btn.sm {
  height: 28px;
  padding: 0 11px;
  font-size: 12px;
}

.glass-btn.active {
  background: var(--accent-tint);
  color: var(--accent);
  border-color: color-mix(in srgb, var(--accent) 45%, var(--glass-border));
  box-shadow: 0 4px 14px -3px var(--accent-glow), var(--glass-rim);
  font-weight: 620;
}

.glass-btn.primary {
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 88%, #fff 12%), var(--accent-strong));
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.32);
  box-shadow: 0 6px 18px -3px var(--accent-glow), inset 0 1px 0 rgba(255, 255, 255, 0.45);
  font-weight: 600;
}

.glass-btn.primary:hover:not(:disabled) {
  filter: brightness(1.07);
  color: #ffffff;
  transform: translateY(-1.5px);
  box-shadow: 0 10px 24px -4px var(--accent-glow), inset 0 1px 0 rgba(255, 255, 255, 0.55);
}

.glass-btn.primary:active:not(:disabled) {
  transform: scale(0.95);
}

.glass-btn.danger-text {
  color: var(--danger);
}

.glass-btn.danger-text:hover:not(:disabled) {
  background: var(--danger-tint);
  border-color: var(--danger);
  color: var(--danger);
  box-shadow: 0 6px 16px -4px var(--danger-tint), var(--glass-rim);
}

/* Liquid Glass Icon Button */
.glass-icon-btn {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--glass-bg-elevated);
  backdrop-filter: var(--blur-std);
  -webkit-backdrop-filter: var(--blur-std);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-glass-sm);
  color: var(--text-secondary);
  cursor: pointer;
  transition:
    transform 0.26s var(--ease-bounce),
    background 0.22s var(--ease-smooth),
    color 0.22s var(--ease-smooth),
    border-color 0.22s var(--ease-smooth),
    box-shadow 0.24s var(--ease-smooth);
}

.glass-icon-btn svg {
  width: 16px;
  height: 16px;
  transition: transform 0.36s var(--ease-spring);
}

.glass-icon-btn.sm {
  width: 28px;
  height: 28px;
}

.glass-icon-btn.sm svg {
  width: 14px;
  height: 14px;
}

.glass-icon-btn:hover {
  background: var(--glass-bg-hover);
  color: var(--accent);
  border-color: var(--accent);
  transform: translateY(-1px) scale(1.04);
  box-shadow: 0 6px 16px -3px var(--accent-glow), var(--glass-rim);
}

.glass-icon-btn:active {
  transform: scale(0.92);
}

.theme-spin-anim svg {
  transform: rotate(180deg) scale(1.1);
}

/* ============================================================================
   LIQUID GLASS SEGMENTED PILL GROUP WITH SLIDING GLIDER
   ============================================================================ */
.glass-pill-group {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 3px;
  padding: 4px;
  border-radius: var(--radius-pill);
  background: var(--glass-bg-subtle);
  backdrop-filter: var(--blur-std);
  -webkit-backdrop-filter: var(--blur-std);
  border: 1px solid var(--glass-border);
  box-shadow: inset 0 1px 2px rgba(15, 23, 42, 0.04), var(--glass-rim);
}

.glass-pill-group.full-width {
  display: flex;
  width: 100%;
}

.glass-pill-group.full-width > button {
  flex: 1;
}

.seg-glider {
  position: absolute;
  top: 4px;
  bottom: 4px;
  left: 0;
  border-radius: var(--radius-pill);
  background: var(--glass-bg-hover);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-glass-sm);
  pointer-events: none;
  z-index: 0;
  transition:
    transform 0.38s var(--ease-spring),
    width 0.38s var(--ease-spring),
    opacity 0.24s var(--ease-smooth);
  will-change: transform, width;
}

.nav-tab,
.seg-btn {
  position: relative;
  z-index: 1;
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-secondary);
  font-size: 13.5px;
  font-weight: 560;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition:
    color 0.24s var(--ease-smooth),
    transform 0.22s var(--ease-spring),
    background 0.24s var(--ease-smooth),
    border-color 0.24s var(--ease-smooth),
    box-shadow 0.24s var(--ease-smooth);
  white-space: nowrap;
}

.nav-tab:hover,
.seg-btn:hover {
  color: var(--text-main);
}

.nav-tab:active,
.seg-btn:active {
  transform: scale(0.96);
}

.nav-tab.active,
.seg-btn.active {
  background: var(--glass-bg-hover);
  color: var(--accent);
  border-color: var(--glass-border);
  box-shadow: var(--shadow-glass-sm);
  font-weight: 640;
}

/* When sliding glider is initialized, let the glider render the pill surface */
.glass-pill-group.has-glider > .nav-tab.active,
.glass-pill-group.has-glider > .seg-btn.active {
  background: transparent;
  border-color: transparent;
  box-shadow: none;
}

.nav-badge,
.pill-count {
  font-size: 11px;
  font-weight: 650;
  padding: 1px 6px;
  border-radius: var(--radius-pill);
  background: var(--accent-tint);
  color: var(--accent);
  font-variant-numeric: tabular-nums;
  transition: transform 0.28s var(--ease-bounce), background 0.22s ease;
}

.badge-pop {
  animation: badgeSpringPop 0.38s var(--ease-bounce);
}

@keyframes badgeSpringPop {
  0% { transform: scale(0.8); }
  55% { transform: scale(1.22); }
  100% { transform: scale(1); }
}

/* Liquid Glass Inputs, Textareas & Custom Selects */
.glass-input,
.glass-select,
.glass-textarea {
  width: 100%;
  padding: 8px 13px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg-input);
  backdrop-filter: var(--blur-std);
  -webkit-backdrop-filter: var(--blur-std);
  box-shadow: inset 0 1px 2px rgba(15, 23, 42, 0.03), var(--glass-rim);
  color: var(--text-main);
  font-size: 13.5px;
  outline: none;
  transition:
    border-color 0.24s var(--ease-spring),
    box-shadow 0.24s var(--ease-spring),
    background 0.24s var(--ease-smooth),
    transform 0.22s var(--ease-spring);
}

.glass-input:focus,
.glass-select:focus,
.glass-textarea:focus {
  border-color: var(--accent);
  background: var(--glass-bg-hover);
  box-shadow: 0 0 0 3.5px var(--accent-glow), var(--glass-rim);
}

.glass-select {
  appearance: none;
  -webkit-appearance: none;
  padding-right: 30px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2.2' 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 10px center;
  cursor: pointer;
}

/* ============================================================================
   TOP GLOBAL LIQUID GLASS HEADER & SPATIAL DEPTH RETREAT
   ============================================================================ */
.site-header {
  position: sticky;
  top: 12px;
  z-index: 100;
  max-width: 1340px;
  margin: 12px auto 0;
  height: 58px;
  border-radius: var(--radius-pill);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 18px;
  transition:
    transform 0.44s var(--ease-spring),
    opacity 0.34s var(--ease-smooth),
    filter 0.36s var(--ease-smooth),
    background 0.32s var(--ease-smooth);
  will-change: transform, opacity;
}

.brand-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  user-select: none;
  transition: transform 0.24s var(--ease-spring);
}

.brand-wrap:hover {
  transform: scale(1.02);
}

.brand-wrap:active {
  transform: scale(0.97);
}

.brand-logo {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px var(--accent-glow), inset 0 1px 0 rgba(255, 255, 255, 0.4);
  transition: transform 0.32s var(--ease-bounce), box-shadow 0.28s var(--ease-smooth);
}

.brand-wrap:hover .brand-logo {
  transform: rotate(-6deg) scale(1.06);
  box-shadow: 0 6px 16px var(--accent-glow), inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

.brand-logo svg {
  width: 17px;
  height: 17px;
}

.brand-text {
  display: flex;
  align-items: baseline;
  gap: 7px;
}

.brand-title {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.3px;
}

.brand-sub {
  font-size: 11.5px;
  color: var(--text-muted);
  font-weight: 500;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.global-search-box {
  position: relative;
  width: 230px;
  transition: width 0.34s var(--ease-spring);
}

.global-search-box:focus-within {
  width: 276px;
}

.global-search-input {
  width: 100%;
  height: 34px;
  padding: 0 12px 0 32px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg-input);
  backdrop-filter: var(--blur-std);
  -webkit-backdrop-filter: var(--blur-std);
  box-shadow: var(--shadow-glass-sm);
  color: var(--text-main);
  font-size: 12.5px;
  outline: none;
  transition:
    border-color 0.26s var(--ease-spring),
    background 0.26s var(--ease-smooth),
    box-shadow 0.26s var(--ease-spring);
}

.global-search-input:focus {
  border-color: var(--accent);
  background: var(--glass-bg-hover);
  box-shadow: 0 0 0 3.5px var(--accent-glow);
}

.search-icon {
  position: absolute;
  left: 11px;
  top: 50%;
  transform: translateY(-50%);
  width: 14px;
  height: 14px;
  color: var(--text-muted);
  pointer-events: none;
  transition: color 0.22s ease, transform 0.26s var(--ease-bounce);
}

.global-search-box:focus-within .search-icon {
  color: var(--accent);
  transform: translateY(-50%) scale(1.1);
}

/* Spatial background retreat when Exam Workspace opens */
body.workspace-active .site-header,
body.workspace-active .main-container {
  transform: scale(0.96) translateY(-6px);
  opacity: 0;
  filter: blur(8px);
  pointer-events: none;
}

/* ============================================================================
   MAIN CATALOG CONTAINER, FILTER BAR & STAGGERED CARD CHOREOGRAPHY
   ============================================================================ */
.main-container {
  max-width: 1340px;
  margin: 0 auto;
  padding: 18px 16px 64px;
  transition:
    transform 0.44s var(--ease-spring),
    opacity 0.34s var(--ease-smooth),
    filter 0.36s var(--ease-smooth);
  will-change: transform, opacity;
}

.loading-state {
  text-align: center;
  padding: 56px 20px;
  color: var(--text-muted);
  font-size: 14px;
  animation: fadeSlideUp 0.34s var(--ease-spring) both;
}

/* Liquid Glass Shimmer Skeleton for Loading States */
.glass-skeleton-wrap {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 8px 4px;
  animation: fadeSlideUp 0.28s var(--ease-spring) both;
}

.skeleton-block {
  height: 18px;
  border-radius: var(--radius-xs);
  background: linear-gradient(
    90deg,
    var(--glass-bg-subtle) 25%,
    var(--glass-bg-hover) 50%,
    var(--glass-bg-subtle) 75%
  );
  background-size: 200% 100%;
  animation: glassShimmer 1.5s infinite linear;
}

@keyframes glassShimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* Unified Liquid Glass Filter Bar */
.catalog-toolbar {
  padding: 14px 18px;
  margin-bottom: 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  animation: toolbarEnter 0.38s var(--ease-spring) both;
}

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

.toolbar-top-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.book-pills-scroll {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  padding-top: 10px;
  border-top: 1px solid var(--glass-border-subtle);
  animation: pillRowReveal 0.32s var(--ease-spring) both;
}

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

.book-pill {
  padding: 5px 13px;
  border-radius: var(--radius-pill);
  font-size: 12.5px;
  font-weight: 560;
  border: 1px solid transparent;
  background: var(--glass-bg-subtle);
  color: var(--text-secondary);
  cursor: pointer;
  transition:
    background 0.24s var(--ease-spring),
    color 0.2s var(--ease-smooth),
    transform 0.24s var(--ease-bounce),
    box-shadow 0.24s var(--ease-spring),
    border-color 0.22s var(--ease-smooth);
}

.book-pill:hover {
  background: var(--glass-bg-hover);
  color: var(--text-main);
  transform: translateY(-1px);
}

.book-pill:active {
  transform: scale(0.94);
}

.book-pill.active {
  background: var(--accent);
  color: #ffffff;
  box-shadow: 0 4px 12px var(--accent-glow), inset 0 1px 0 rgba(255, 255, 255, 0.35);
  font-weight: 620;
  transform: translateY(-0.5px) scale(1.02);
}

/* Catalog Body Container for Smooth Cross-Fade & Staggered Cascade */
#catalogGridBody,
#mySubContent {
  transition: opacity 0.18s var(--ease-smooth), transform 0.18s var(--ease-smooth);
  will-change: opacity, transform;
}

#catalogGridBody.stage-switching,
#mySubContent.stage-switching {
  opacity: 0;
  transform: translateY(6px) scale(0.992);
}

/* 2x2 Minimalist Test Grid (Test 1 - Test 4) */
.tests-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

@media (max-width: 920px) {
  .tests-grid {
    grid-template-columns: 1fr;
  }
}

.test-card {
  padding: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  animation: cardCascadeIn 0.44s var(--ease-spring) both;
  animation-delay: calc(var(--stagger-i, 0) * 45ms);
}

.test-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glass-lg);
}

@keyframes cardCascadeIn {
  from {
    opacity: 0;
    transform: translateY(14px) scale(0.982);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes fadeSlideUp {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.test-card-header {
  padding: 13px 18px;
  background: var(--glass-bg-subtle);
  border-bottom: 1px solid var(--glass-border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.test-card-title {
  font-size: 14.5px;
  font-weight: 680;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

.test-card-title::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
  transition: transform 0.28s var(--ease-bounce);
}

.test-card:hover .test-card-title::before {
  transform: scale(1.3);
}

.test-card-meta {
  font-size: 12px;
  color: var(--text-muted);
}

.test-items-list {
  display: flex;
  flex-direction: column;
}

.question-row {
  padding: 12px 18px;
  border-bottom: 1px solid var(--glass-border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  transition:
    background 0.22s var(--ease-smooth),
    transform 0.22s var(--ease-spring),
    padding-left 0.24s var(--ease-spring);
  cursor: pointer;
}

.question-row:last-child {
  border-bottom: none;
}

.question-row:hover {
  background: var(--glass-bg-hover);
  padding-left: 22px;
}

.question-row:active {
  transform: scale(0.994);
}

.q-info-cell {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  flex: 1;
  flex-wrap: wrap;
  transition: transform 0.24s var(--ease-spring);
}

.q-name-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-main);
  text-decoration: none;
  transition: color 0.2s var(--ease-smooth);
}

.question-row:hover .q-name-link {
  color: var(--accent);
}

.q-badge {
  font-size: 11px;
  font-weight: 550;
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  background: var(--glass-bg-subtle);
  color: var(--text-secondary);
  border: 1px solid var(--glass-border);
  transition: transform 0.22s var(--ease-spring), background 0.22s ease;
}

.q-badge.scene {
  background: var(--accent-tint);
  color: var(--accent);
  border-color: transparent;
}

.q-badge.topic-tag {
  background: rgba(59, 130, 246, 0.1);
  color: #3b82f6;
  border-color: transparent;
}

.q-actions-cell {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.record-pill {
  font-size: 11.5px;
  font-weight: 600;
  padding: 2px 9px;
  border-radius: var(--radius-pill);
  font-variant-numeric: tabular-nums;
  transition: transform 0.24s var(--ease-bounce);
}

.record-pill.done {
  background: var(--success-tint);
  color: var(--success);
}

.record-pill.draft {
  background: var(--warning-tint);
  color: var(--warning);
}

/* Smooth Removal Animation for Notebook Items */
.item-removing {
  opacity: 0 !important;
  transform: scale(0.95) translateX(-12px) !important;
  max-height: 0 !important;
  margin-bottom: 0 !important;
  padding-top: 0 !important;
  padding-bottom: 0 !important;
  overflow: hidden !important;
  transition:
    opacity 0.26s var(--ease-smooth),
    transform 0.28s var(--ease-spring),
    max-height 0.3s var(--ease-spring),
    margin 0.3s var(--ease-spring),
    padding 0.3s var(--ease-spring) !important;
}

/* ============================================================================
   FULL-SCREEN LIQUID GLASS EXAM & PRACTICE WORKSPACE (SPATIAL TRANSITION)
   ============================================================================ */
.exam-workspace {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: var(--bg-canvas);
  display: flex;
  flex-direction: column;
  visibility: hidden;
  pointer-events: none;
  opacity: 0;
  transform: scale(1.028) translateY(14px);
  filter: blur(10px);
  transition:
    opacity 0.34s var(--ease-smooth),
    transform 0.42s var(--ease-spring),
    filter 0.34s var(--ease-smooth),
    visibility 0s linear 0.42s,
    background-color 0.38s var(--ease-smooth);
  will-change: transform, opacity, filter;
}

.exam-workspace.open {
  visibility: visible;
  pointer-events: auto;
  opacity: 1;
  transform: scale(1) translateY(0);
  filter: blur(0px);
  transition:
    opacity 0.36s var(--ease-smooth),
    transform 0.44s var(--ease-spring),
    filter 0.36s var(--ease-smooth),
    visibility 0s linear 0s,
    background-color 0.38s var(--ease-smooth);
}

/* Top Liquid Glass Exam Bar */
.exam-topbar {
  height: 54px;
  padding: 0 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: none;
  border-left: none;
  border-right: none;
  border-radius: 0;
  z-index: 220;
  user-select: none;
}

.exam-topbar-left,
.exam-topbar-center,
.exam-topbar-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.exam-crumb-group {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 3px 6px;
  border-radius: var(--radius-pill);
  background: var(--glass-bg-subtle);
  border: 1px solid var(--glass-border);
  transition: background 0.24s ease, border-color 0.24s ease;
}

.exam-title-crumb {
  font-size: 13.5px;
  font-weight: 640;
  padding: 0 6px;
  color: var(--text-main);
  max-width: 280px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  transition: opacity 0.22s ease, transform 0.24s var(--ease-spring);
}

/* Liquid Glass Timer Capsule */
.timer-capsule {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 34px;
  padding: 0 13px;
  border-radius: var(--radius-pill);
  background: var(--glass-bg-elevated);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-glass-sm);
  font-variant-numeric: tabular-nums;
  font-size: 13.5px;
  font-weight: 650;
  cursor: pointer;
  transition:
    transform 0.24s var(--ease-bounce),
    background 0.22s ease,
    border-color 0.22s ease,
    box-shadow 0.22s ease;
}

.timer-capsule:hover {
  background: var(--glass-bg-hover);
  border-color: var(--accent);
  transform: translateY(-1px);
}

.timer-capsule:active {
  transform: scale(0.96);
}

.timer-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
  transition: background 0.26s ease, box-shadow 0.26s ease, transform 0.26s var(--ease-bounce);
}

.timer-dot.paused {
  background: var(--warning);
  box-shadow: 0 0 6px var(--warning);
  transform: scale(0.85);
}

.timer-eye-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  padding: 2px;
  transition: color 0.18s ease, transform 0.22s var(--ease-bounce);
}

.timer-eye-btn svg {
  width: 14px;
  height: 14px;
}

.timer-eye-btn:hover {
  color: var(--text-main);
  transform: scale(1.12);
}

/* Highlighter Palette Capsule in Topbar */
.hl-toolbar-capsule {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 34px;
  padding: 0 11px;
  border-radius: var(--radius-pill);
  background: var(--glass-bg-elevated);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-glass-sm);
  transition: background 0.24s ease, border-color 0.24s ease;
}

.hl-palette-dots {
  display: flex;
  align-items: center;
  gap: 5px;
}

.hl-divider {
  width: 1px;
  height: 16px;
  background: var(--glass-border-subtle);
}

.hl-mode-toggle {
  background: none;
  border: none;
  font-size: 12px;
  font-weight: 580;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 2px 6px;
  border-radius: var(--radius-pill);
  transition:
    color 0.22s ease,
    background 0.22s ease,
    transform 0.22s var(--ease-bounce);
}

.hl-mode-toggle:hover {
  color: var(--text-main);
}

.hl-mode-toggle:active {
  transform: scale(0.94);
}

.hl-mode-toggle.active {
  color: var(--accent);
  background: var(--accent-tint);
  font-weight: 680;
}

/* Popover Anchor & Bidirectional Animated Liquid Glass Popovers */
.popover-anchor {
  position: relative;
}

.glass-popover {
  background: var(--glass-popover-bg);
  backdrop-filter: var(--blur-heavy);
  -webkit-backdrop-filter: var(--blur-heavy);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-glass-lg);
  border-radius: var(--radius-md);
}

#appearancePopover {
  position: absolute;
  right: 0;
  top: 42px;
  width: 248px;
  padding: 14px;
  z-index: 300;
  visibility: hidden;
  pointer-events: none;
  opacity: 0;
  transform: scale(0.92) translateY(-6px);
  transform-origin: top right;
  filter: blur(4px);
  transition:
    opacity 0.22s var(--ease-smooth),
    transform 0.28s var(--ease-spring),
    filter 0.22s var(--ease-smooth),
    visibility 0s linear 0.28s;
}

#appearancePopover.visible {
  visibility: visible;
  pointer-events: auto;
  opacity: 1;
  transform: scale(1) translateY(0);
  filter: blur(0px);
  transition:
    opacity 0.24s var(--ease-smooth),
    transform 0.32s var(--ease-spring),
    filter 0.24s var(--ease-smooth),
    visibility 0s linear 0s;
}

.popover-label {
  display: block;
  font-size: 11.5px;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 6px;
}

/* ============================================================================
   SPLIT-SCREEN READING / LISTENING / WRITING / SPEAKING PANES
   ============================================================================ */
.split-container {
  flex: 1;
  display: flex;
  overflow: hidden;
  position: relative;
  padding: 12px 14px;
  gap: 0;
}

.split-pane {
  height: 100%;
  overflow-y: auto;
  padding: 26px 30px 72px;
  background: var(--glass-bg);
  backdrop-filter: var(--blur-std);
  -webkit-backdrop-filter: var(--blur-std);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-glass-md);
  border-radius: var(--radius-md);
  scroll-behavior: smooth;
  transition:
    background 0.32s var(--ease-smooth),
    border-color 0.32s var(--ease-smooth),
    opacity 0.24s var(--ease-smooth),
    transform 0.32s var(--ease-spring);
  will-change: transform, opacity;
}

/* Directional Slide Transitions on Prev/Next Navigation */
.split-pane.pane-slide-out-left {
  opacity: 0;
  transform: translateX(-18px) scale(0.99);
}

.split-pane.pane-slide-out-right {
  opacity: 0;
  transform: translateX(18px) scale(0.99);
}

.split-pane.pane-slide-in {
  animation: paneContentEnter 0.42s var(--ease-spring) both;
}

@keyframes paneContentEnter {
  from {
    opacity: 0;
    transform: translateY(10px) scale(0.992);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.split-left {
  width: 50%;
}

.split-resizer {
  width: 14px;
  cursor: col-resize;
  display: flex;
  align-items: center;
  justify-content: center;
  user-select: none;
  z-index: 10;
  flex-shrink: 0;
}

.resizer-pill {
  width: 4px;
  height: 42px;
  border-radius: 999px;
  background: var(--glass-border);
  border: 1px solid var(--glass-border-subtle);
  transition:
    height 0.26s var(--ease-spring),
    width 0.22s var(--ease-spring),
    background 0.22s ease,
    box-shadow 0.22s ease;
}

.split-resizer:hover .resizer-pill,
.split-resizer.dragging .resizer-pill {
  height: 68px;
  width: 5px;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent-glow);
}

.split-right {
  flex: 1;
}

/* Passage Typography & Smooth Bilingual Unfold */
.passage-header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 12px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--glass-border-subtle);
  font-size: 12.5px;
  color: var(--text-muted);
}

.passage-article {
  font-size: var(--passage-font-size);
  line-height: var(--passage-line-height);
  color: var(--text-main);
  transition: font-size 0.24s var(--ease-spring), line-height 0.24s var(--ease-spring);
}

.passage-para {
  margin-bottom: 16px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  border-left: 3px solid transparent;
  transition:
    background-color 0.32s var(--ease-smooth),
    box-shadow 0.32s var(--ease-smooth),
    border-left-color 0.32s var(--ease-smooth),
    transform 0.28s var(--ease-spring);
  position: relative;
  animation: fadeSlideUp 0.38s var(--ease-spring) both;
  animation-delay: calc(var(--para-i, 0) * 24ms);
}

.passage-para.title-para {
  font-size: calc(var(--passage-font-size) * 1.32);
  font-weight: 750;
  line-height: 1.35;
  margin-bottom: 10px;
  letter-spacing: -0.3px;
}

.passage-para.subtitle-para {
  font-style: italic;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--glass-border-subtle);
  padding-bottom: 14px;
}

.para-index-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 650;
  color: var(--accent);
  background: var(--accent-tint);
  padding: 1px 7px;
  border-radius: var(--radius-pill);
  margin-right: 7px;
  user-select: none;
  transition: transform 0.22s var(--ease-bounce), background 0.22s ease;
}

/* Smooth Bilingual Translation Unfold (No abrupt display:none jump!) */
.para-cn {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  margin-top: 0;
  padding: 0 12px;
  background: var(--glass-bg-subtle);
  border-left: 0px solid var(--accent);
  border-radius: 0 var(--radius-xs) var(--radius-xs) 0;
  font-size: calc(var(--passage-font-size) * 0.88);
  color: var(--text-secondary);
  line-height: 1.65;
  transform: translateY(-6px);
  pointer-events: none;
  transition:
    max-height 0.42s var(--ease-spring),
    opacity 0.3s var(--ease-smooth),
    transform 0.36s var(--ease-spring),
    margin-top 0.34s var(--ease-spring),
    padding 0.34s var(--ease-spring),
    border-left-width 0.24s var(--ease-spring),
    filter 0.26s var(--ease-smooth);
}

.bilingual-on .para-cn {
  max-height: 600px;
  opacity: 1;
  margin-top: 8px;
  padding: 8px 12px;
  border-left-width: 2.5px;
  transform: translateY(0);
  pointer-events: auto;
  filter: blur(0px);
}

.bilingual-blur .para-cn {
  max-height: 600px;
  opacity: 1;
  margin-top: 8px;
  padding: 8px 12px;
  border-left-width: 2.5px;
  transform: translateY(0);
  pointer-events: auto;
  filter: blur(4.5px);
  cursor: pointer;
}

.bilingual-blur .para-cn:hover {
  filter: blur(0px);
}

@keyframes evidencePulse {
  0% {
    background-color: var(--warning-tint);
    box-shadow: 0 0 0 4px rgba(217, 119, 6, 0.24);
    transform: scale(1.008);
  }
  40% {
    transform: scale(1);
  }
  100% {
    background-color: rgba(217, 119, 6, 0.08);
    box-shadow: 0 0 0 0 rgba(217, 119, 6, 0);
    transform: scale(1);
  }
}

.passage-para.evidence-spotlight,
.lrc-sentence-item.evidence-spotlight {
  animation: evidencePulse 2.2s var(--ease-spring) forwards;
  border-left: 3px solid var(--warning);
}

/* ============================================================================
   HIGHLIGHTING (INK SWEEP & FADE-OUT) & LIQUID GLASS CONTEXT MENU
   ============================================================================ */
.user-hl {
  border-radius: 4px;
  padding: 1px 3px;
  cursor: pointer;
  background-repeat: no-repeat;
  background-position: left center;
  background-size: 100% 100%;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
  animation: hlInkSweep 0.36s var(--ease-spring) forwards;
  transition:
    background-size 0.26s var(--ease-spring),
    background-image 0.24s ease,
    opacity 0.24s var(--ease-smooth),
    filter 0.18s ease,
    box-shadow 0.2s var(--ease-spring);
}

@keyframes hlInkSweep {
  0% {
    background-size: 0% 100%;
  }
  100% {
    background-size: 100% 100%;
  }
}

.user-hl:hover {
  filter: brightness(0.95);
  box-shadow: 0 0 0 2.5px var(--accent-glow);
}

.user-hl.hl-yellow {
  background-image: linear-gradient(90deg, rgba(250, 204, 21, 0.5), rgba(250, 204, 21, 0.5));
  color: inherit;
}
.user-hl.hl-green {
  background-image: linear-gradient(90deg, rgba(52, 211, 153, 0.44), rgba(52, 211, 153, 0.44));
  color: inherit;
}
.user-hl.hl-blue {
  background-image: linear-gradient(90deg, rgba(96, 165, 250, 0.44), rgba(96, 165, 250, 0.44));
  color: inherit;
}
.user-hl.hl-pink {
  background-image: linear-gradient(90deg, rgba(244, 114, 182, 0.42), rgba(244, 114, 182, 0.42));
  color: inherit;
}
.user-hl.hl-orange {
  background-image: linear-gradient(90deg, rgba(251, 146, 60, 0.46), rgba(251, 146, 60, 0.46));
  color: inherit;
}

/* Smooth exit transition before unwrapping highlight DOM node */
.user-hl.hl-removing {
  background-size: 0% 100% !important;
  box-shadow: none !important;
  border-bottom-color: transparent !important;
}

.user-hl.has-note {
  border-bottom: 2px dashed var(--accent);
}

.collect-word-mark {
  border-bottom: 1.5px dotted var(--accent);
  transition: background 0.2s ease, color 0.2s ease;
}

.collect-word-mark:hover {
  background: var(--accent-tint);
  border-radius: 3px;
}

/* Color Dots */
.color-dots {
  display: flex;
  align-items: center;
  gap: 6px;
}

.color-dot {
  width: 17px;
  height: 17px;
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid rgba(255, 255, 255, 0.72);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.15);
  transition:
    transform 0.26s var(--ease-bounce),
    box-shadow 0.22s var(--ease-smooth),
    border-color 0.2s ease;
  padding: 0;
}

.color-dot:hover,
.color-dot.active {
  transform: scale(1.24);
  border-color: var(--text-main);
  box-shadow: 0 3px 8px rgba(0, 0, 0, 0.22);
}

.color-dot:active {
  transform: scale(0.95);
}

.color-dot.yellow { background: #facc15; }
.color-dot.green  { background: #34d399; }
.color-dot.blue   { background: #60a5fa; }
.color-dot.pink   { background: #f472b6; }
.color-dot.orange { background: #fb923c; }

/* Bidirectional Right-Click & Highlight Popover Menu */
.context-menu {
  position: fixed;
  z-index: 9999;
  width: 236px;
  padding: 8px;
  user-select: none;
  visibility: hidden;
  pointer-events: none;
  opacity: 0;
  transform: scale(0.9) translateY(6px);
  transform-origin: top left;
  filter: blur(5px);
  transition:
    opacity 0.2s var(--ease-smooth),
    transform 0.28s var(--ease-spring),
    filter 0.2s var(--ease-smooth),
    visibility 0s linear 0.28s;
  will-change: transform, opacity;
}

.context-menu.visible {
  visibility: visible;
  pointer-events: auto;
  opacity: 1;
  transform: scale(1) translateY(0);
  filter: blur(0px);
  transition:
    opacity 0.22s var(--ease-smooth),
    transform 0.32s var(--ease-spring),
    filter 0.22s var(--ease-smooth),
    visibility 0s linear 0s;
}

.ctx-color-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 8px 8px;
  border-bottom: 1px solid var(--glass-border-subtle);
  margin-bottom: 4px;
}

.ctx-color-label {
  font-size: 11.5px;
  color: var(--text-muted);
  font-weight: 600;
}

.ctx-item {
  width: 100%;
  border: none;
  background: transparent;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 7px 10px;
  border-radius: var(--radius-xs);
  font-size: 13px;
  font-weight: 560;
  color: var(--text-main);
  cursor: pointer;
  text-align: left;
  transition:
    background 0.18s var(--ease-smooth),
    color 0.18s var(--ease-smooth),
    transform 0.18s var(--ease-spring),
    padding-left 0.18s var(--ease-spring);
}

.ctx-item:hover:not(.disabled) {
  background: var(--accent-tint);
  color: var(--accent);
  padding-left: 13px;
}

.ctx-item:active:not(.disabled) {
  transform: scale(0.97);
}

.ctx-item.danger {
  color: var(--danger);
}

.ctx-item.danger:hover:not(.disabled) {
  background: var(--danger-tint);
  color: var(--danger);
}

.ctx-item.disabled {
  display: none;
}

.ctx-shortcut {
  font-size: 11px;
  color: var(--text-muted);
  font-family: ui-monospace, SFMono-Regular, monospace;
}

.ctx-divider {
  height: 1px;
  background: var(--glass-border-subtle);
  margin: 4px 0;
}

.ctx-dict-preview {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  margin-top: 0;
  padding: 0 10px;
  background: var(--glass-bg-subtle);
  border-radius: var(--radius-xs);
  border: 0px solid var(--glass-border);
  font-size: 12px;
  transition:
    max-height 0.34s var(--ease-spring),
    opacity 0.24s var(--ease-smooth),
    margin-top 0.28s var(--ease-spring),
    padding 0.28s var(--ease-spring),
    border-width 0.2s ease;
}

.ctx-dict-preview.visible {
  max-height: 160px;
  opacity: 1;
  margin-top: 6px;
  padding: 9px 10px;
  border-width: 1px;
}

.ctx-dict-word {
  font-weight: 700;
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 4px;
}

.ctx-audio-btns {
  display: flex;
  gap: 4px;
}

.dict-audio-pill {
  border: 1px solid var(--glass-border);
  background: var(--glass-bg-elevated);
  color: var(--text-secondary);
  font-size: 10.5px;
  padding: 1px 6px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: all 0.18s var(--ease-spring);
}

.dict-audio-pill:hover {
  color: var(--accent);
  border-color: var(--accent);
  transform: scale(1.06);
}

.ctx-dict-exp {
  color: var(--text-secondary);
  font-size: 11.5px;
  line-height: 1.45;
}

/* Bidirectional Liquid Glass Note & Paraphrase Modals */
.note-modal {
  position: fixed;
  z-index: 9998;
  width: 316px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  visibility: hidden;
  pointer-events: none;
  opacity: 0;
  transform: scale(0.9) translateY(10px);
  filter: blur(6px);
  transition:
    opacity 0.24s var(--ease-smooth),
    transform 0.32s var(--ease-spring),
    filter 0.24s var(--ease-smooth),
    visibility 0s linear 0.32s;
  will-change: transform, opacity;
}

.note-modal.visible {
  visibility: visible;
  pointer-events: auto;
  opacity: 1;
  transform: scale(1) translateY(0);
  filter: blur(0px);
  transition:
    opacity 0.26s var(--ease-smooth),
    transform 0.36s var(--ease-spring),
    filter 0.26s var(--ease-smooth),
    visibility 0s linear 0s;
}

.note-modal-header {
  padding: 10px 14px;
  background: var(--glass-bg-subtle);
  border-bottom: 1px solid var(--glass-border-subtle);
  font-size: 13px;
  font-weight: 650;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.note-modal-quote {
  padding: 8px 14px;
  font-size: 12px;
  font-style: italic;
  color: var(--text-secondary);
  background: var(--accent-tint);
  border-bottom: 1px solid var(--glass-border-subtle);
  max-height: 64px;
  overflow-y: auto;
}

.note-modal-textarea {
  height: 110px;
  border: none;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
  resize: none;
}

.note-modal-textarea:focus {
  box-shadow: none;
}

.note-modal-footer {
  padding: 8px 14px;
  background: var(--glass-bg-subtle);
  border-top: 1px solid var(--glass-border-subtle);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* ============================================================================
   QUESTION CARDS, INLINE BLANKS, OPTIONS & ACCORDION EXPLANATIONS (RIGHT PANE)
   ============================================================================ */
.q-group-block {
  background: var(--glass-bg-elevated);
  backdrop-filter: var(--blur-std);
  -webkit-backdrop-filter: var(--blur-std);
  border-radius: var(--radius-md);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-glass-sm);
  padding: 18px 22px;
  margin-bottom: 16px;
  animation: cardCascadeIn 0.42s var(--ease-spring) both;
  animation-delay: calc(var(--qblock-i, 0) * 50ms);
  transition:
    box-shadow 0.28s var(--ease-spring),
    border-color 0.28s var(--ease-smooth),
    transform 0.28s var(--ease-spring);
}

.q-group-block:focus-within {
  border-color: color-mix(in srgb, var(--accent) 42%, var(--glass-border));
  box-shadow: 0 12px 32px -8px var(--accent-glow), var(--glass-rim);
}

.q-group-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 10px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--glass-border-subtle);
}

.q-group-badge {
  font-size: 12px;
  font-weight: 680;
  color: var(--accent);
  background: var(--accent-tint);
  padding: 3px 11px;
  border-radius: var(--radius-pill);
}

.q-stem-body {
  font-size: var(--passage-font-size);
  line-height: 1.85;
  color: var(--text-main);
  transition: font-size 0.24s var(--ease-spring);
}

.q-stem-body img {
  max-width: 100%;
  border-radius: var(--radius-sm);
  margin: 10px 0;
  border: 1px solid var(--glass-border);
}

/* Inline Blank Capsule ({{response}}) */
.blank-wrap {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  margin: 3px 4px;
  vertical-align: middle;
}

.blank-num-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 11.5px;
  font-weight: 680;
  padding: 0 5px;
  cursor: pointer;
  box-shadow: 0 2px 6px var(--accent-glow);
  transition:
    background 0.26s var(--ease-spring),
    transform 0.28s var(--ease-bounce),
    box-shadow 0.26s var(--ease-smooth);
}

.blank-num-badge:hover {
  transform: scale(1.14);
}

.blank-num-badge:active {
  transform: scale(0.9);
}

.blank-num-badge.flagged {
  background: var(--warning);
  box-shadow: 0 2px 8px var(--warning-tint);
  transform: scale(1.08);
}

.blank-input {
  min-width: 136px;
  width: 152px;
  height: 30px;
  padding: 0 11px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text-main);
  background: var(--glass-bg-input);
  backdrop-filter: var(--blur-std);
  -webkit-backdrop-filter: var(--blur-std);
  border: 1px solid color-mix(in srgb, var(--text-muted) 32%, var(--glass-border));
  border-radius: var(--radius-pill);
  box-shadow: inset 0 1px 2px rgba(15, 23, 42, 0.04);
  outline: none;
  transition:
    border-color 0.24s var(--ease-spring),
    background 0.24s var(--ease-smooth),
    box-shadow 0.24s var(--ease-spring),
    transform 0.22s var(--ease-spring),
    color 0.22s ease;
}

.blank-input:focus {
  border-color: var(--accent);
  background: var(--glass-bg-hover);
  box-shadow: 0 0 0 3.5px var(--accent-glow);
  transform: translateY(-0.5px);
}

.blank-input.word-limit-warn {
  border-color: var(--warning);
  box-shadow: 0 0 0 3px var(--warning-tint);
}

.blank-input.correct {
  border-color: var(--success);
  background: var(--success-tint);
  color: var(--success);
}

.blank-input.wrong {
  border-color: var(--danger);
  background: var(--danger-tint);
  color: var(--danger);
  text-decoration: line-through;
}

.blank-letter-select {
  width: auto;
  min-width: 72px;
  height: 30px;
  padding: 0 24px 0 10px;
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-weight: 600;
}

/* Smooth Unfolding Correct Answer Chip */
.correct-ans-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: var(--success-tint);
  color: var(--success);
  font-size: 12.5px;
  font-weight: 660;
  border-radius: var(--radius-pill);
  border: 0px solid color-mix(in srgb, var(--success) 30%, transparent);
  white-space: nowrap;
  overflow: hidden;
  max-width: 0;
  opacity: 0;
  padding: 0;
  transform: scale(0.84) translateX(-4px);
  pointer-events: none;
  transition:
    max-width 0.38s var(--ease-spring),
    opacity 0.26s var(--ease-smooth),
    transform 0.34s var(--ease-bounce),
    padding 0.3s var(--ease-spring),
    border-width 0.2s ease;
}

.correct-ans-chip.show {
  max-width: 320px;
  opacity: 1;
  padding: 2px 9px;
  border-width: 1px;
  transform: scale(1) translateX(0);
  pointer-events: auto;
}

/* Option Cards (Single & Multiple Choice) - In-Place Spring Morphing */
.options-list {
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.option-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg-subtle);
  box-shadow: var(--glass-rim);
  cursor: pointer;
  transition:
    background 0.26s var(--ease-spring),
    border-color 0.26s var(--ease-spring),
    transform 0.26s var(--ease-spring),
    box-shadow 0.26s var(--ease-spring),
    opacity 0.28s var(--ease-smooth);
}

.option-item:hover {
  background: var(--glass-bg-hover);
  border-color: color-mix(in srgb, var(--accent) 45%, var(--glass-border));
  transform: translateX(2px);
}

.option-item:active {
  transform: scale(0.988);
}

.option-item.selected {
  border-color: var(--accent);
  background: var(--accent-tint);
  font-weight: 600;
  transform: translateX(4px);
  box-shadow: 0 6px 18px -4px var(--accent-glow), var(--glass-rim);
}

.option-item.correct-opt {
  border-color: var(--success);
  background: var(--success-tint);
}

.option-item.wrong-opt {
  border-color: var(--danger);
  background: var(--danger-tint);
}

.option-item.eliminated {
  opacity: 0.42;
  transform: scale(0.988);
}

.option-item.eliminated .opt-text {
  text-decoration: line-through;
}

.opt-left {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  flex: 1;
}

.opt-key {
  min-width: 25px;
  height: 25px;
  border-radius: 50%;
  background: var(--glass-bg-elevated);
  border: 1px solid var(--glass-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12.5px;
  font-weight: 660;
  flex-shrink: 0;
  transition:
    background 0.26s var(--ease-spring),
    color 0.22s ease,
    border-color 0.26s var(--ease-spring),
    transform 0.34s var(--ease-bounce),
    box-shadow 0.26s var(--ease-spring);
}

.option-item.selected .opt-key {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  transform: scale(1.12);
  box-shadow: 0 3px 10px var(--accent-glow);
}

.option-item.correct-opt .opt-key {
  background: var(--success);
  color: #fff;
  border-color: var(--success);
}

.option-item.wrong-opt .opt-key {
  background: var(--danger);
  color: #fff;
  border-color: var(--danger);
}

.eliminate-btn {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg-elevated);
  color: var(--text-muted);
  cursor: pointer;
  opacity: 0;
  transform: translateX(4px);
  transition:
    opacity 0.2s var(--ease-smooth),
    transform 0.22s var(--ease-spring),
    background 0.18s ease,
    color 0.18s ease;
}

.option-item:hover .eliminate-btn,
.option-item.eliminated .eliminate-btn {
  opacity: 1;
  transform: translateX(0);
}

.eliminate-btn:hover {
  color: var(--text-main);
  border-color: var(--text-muted);
}

/* Smooth CSS Grid Accordion for Explanation / Analysis Box */
.analysis-collapse {
  display: grid;
  grid-template-rows: 0fr;
  opacity: 0;
  margin-top: 0;
  transition:
    grid-template-rows 0.42s var(--ease-spring),
    opacity 0.3s var(--ease-smooth),
    margin-top 0.36s var(--ease-spring);
}

.analysis-collapse.show {
  grid-template-rows: 1fr;
  opacity: 1;
  margin-top: 14px;
}

.analysis-inner {
  overflow: hidden;
}

.analysis-box {
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  background: var(--accent-tint);
  border: 1px solid color-mix(in srgb, var(--accent) 26%, var(--glass-border));
  color: var(--text-main);
  font-size: 13.5px;
  line-height: 1.72;
  transform: translateY(-6px);
  transition: transform 0.38s var(--ease-spring);
}

.analysis-collapse.show .analysis-box {
  transform: translateY(0);
}

.analysis-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
  font-weight: 680;
  color: var(--accent);
  font-size: 13px;
}

/* Writing Model Essay Smooth Collapse & Tab Switch */
.essay-ref-pane {
  animation: fadeSlideUp 0.3s var(--ease-spring) both;
}

/* ============================================================================
   LIQUID GLASS AUDIO STUDIO & CUSTOM MINI AUDIO PILLS
   ============================================================================ */
.audio-studio-card {
  background: var(--glass-bg-elevated);
  backdrop-filter: var(--blur-std);
  -webkit-backdrop-filter: var(--blur-std);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-glass-md);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-bottom: 16px;
  animation: cardCascadeIn 0.38s var(--ease-spring) both;
}

.audio-controls-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.play-btn-circle {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #fff;
  border: none;
  font-size: 14px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px var(--accent-glow), inset 0 1px 0 rgba(255, 255, 255, 0.4);
  flex-shrink: 0;
  transition: transform 0.26s var(--ease-bounce), box-shadow 0.24s ease;
}

.play-btn-circle:hover {
  transform: scale(1.08);
  box-shadow: 0 6px 16px var(--accent-glow), inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

.play-btn-circle:active {
  transform: scale(0.92);
}

.audio-progress-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 10px;
}

.audio-time-lbl {
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  color: var(--text-secondary);
  min-width: 38px;
}

/* Custom Liquid Glass Range Slider */
.audio-range {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  border-radius: var(--radius-pill);
  background: var(--glass-border-subtle);
  outline: none;
  cursor: pointer;
  transition: height 0.18s ease;
}

.audio-range:hover {
  height: 8px;
}

.audio-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid #ffffff;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
  cursor: pointer;
  transition: transform 0.22s var(--ease-bounce), box-shadow 0.2s ease;
}

.audio-range::-webkit-slider-thumb:hover {
  transform: scale(1.24);
  box-shadow: 0 3px 10px var(--accent-glow);
}

.lrc-sentence-item {
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--glass-border);
  margin-bottom: 8px;
  background: var(--glass-bg-subtle);
  cursor: pointer;
  transition:
    background 0.24s var(--ease-smooth),
    border-color 0.24s var(--ease-smooth),
    transform 0.24s var(--ease-spring),
    box-shadow 0.24s var(--ease-smooth);
  animation: fadeSlideUp 0.36s var(--ease-spring) both;
  animation-delay: calc(var(--lrc-i, 0) * 18ms);
}

.lrc-sentence-item:hover {
  background: var(--glass-bg-hover);
  border-color: color-mix(in srgb, var(--accent) 40%, var(--glass-border));
  transform: translateX(3px);
}

.lrc-sentence-item.active-line {
  border-left: 3.5px solid var(--accent);
  background: var(--accent-tint);
  transform: translateX(4px);
  box-shadow: 0 6px 18px -6px var(--accent-glow);
}

/* Custom Liquid Glass Mini Audio Bar (for Speaking sample answers) */
.glass-mini-audio {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 14px 6px 8px;
  border-radius: var(--radius-pill);
  background: var(--glass-bg-subtle);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-glass-sm);
  margin-bottom: 10px;
  transition: transform 0.24s var(--ease-spring), background 0.22s ease, border-color 0.22s ease;
}

.glass-mini-audio:hover {
  background: var(--glass-bg-hover);
  border-color: color-mix(in srgb, var(--accent) 40%, var(--glass-border));
  transform: translateY(-1px);
}

.mini-play-btn {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: none;
  background: var(--accent);
  color: #fff;
  font-size: 11px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform 0.24s var(--ease-bounce), box-shadow 0.22s ease;
}

.mini-play-btn:hover {
  transform: scale(1.12);
  box-shadow: 0 3px 10px var(--accent-glow);
}

.mini-play-btn:active {
  transform: scale(0.92);
}

.mini-audio-label {
  font-size: 12px;
  font-weight: 580;
  color: var(--text-secondary);
}

/* ============================================================================
   BOTTOM LIQUID GLASS QUESTION NAVIGATOR & BIDIRECTIONAL SIDE DRAWER
   ============================================================================ */
.exam-bottombar {
  height: 52px;
  padding: 0 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: none;
  border-left: none;
  border-right: none;
  border-radius: 0;
  z-index: 220;
}

.bottom-nav-left {
  display: flex;
  align-items: center;
  gap: 10px;
  overflow: hidden;
  flex: 1;
}

.bottom-nav-label {
  font-size: 12px;
  font-weight: 640;
  color: var(--text-secondary);
  white-space: nowrap;
}

.q-nav-pills {
  display: flex;
  align-items: center;
  gap: 5px;
  overflow-x: auto;
  padding: 4px 2px;
}

.q-nav-pill {
  min-width: 30px;
  height: 30px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg-elevated);
  box-shadow: var(--glass-rim);
  color: var(--text-secondary);
  font-size: 12.5px;
  font-weight: 640;
  font-variant-numeric: tabular-nums;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  transition:
    background 0.26s var(--ease-spring),
    border-color 0.26s var(--ease-spring),
    color 0.22s ease,
    transform 0.28s var(--ease-bounce),
    box-shadow 0.26s var(--ease-spring);
}

.q-nav-pill:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px) scale(1.06);
}

.q-nav-pill:active {
  transform: scale(0.92);
}

.q-nav-pill.answered {
  background: var(--accent-tint);
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: 0 3px 10px -2px var(--accent-glow), var(--glass-rim);
}

.q-nav-pill.flagged::after {
  content: "";
  position: absolute;
  top: -2px;
  right: -2px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--warning);
  box-shadow: 0 0 6px var(--warning);
  animation: badgeSpringPop 0.34s var(--ease-bounce);
}

.q-nav-pill.correct {
  background: var(--success-tint);
  border-color: var(--success);
  color: var(--success);
}

.q-nav-pill.wrong {
  background: var(--danger-tint);
  border-color: var(--danger);
  color: var(--danger);
}

.bottom-nav-right {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  color: var(--text-muted);
  white-space: nowrap;
}

.score-summary-pill {
  font-weight: 660;
  color: var(--accent);
  transition: transform 0.34s var(--ease-bounce), opacity 0.26s ease;
}

/* Highlights & Notes Side Glass Drawer (Smooth Slide-In & Slide-Out) */
.side-drawer {
  position: fixed;
  top: 64px;
  right: 14px;
  bottom: 62px;
  width: 356px;
  border-radius: var(--radius-md);
  z-index: 250;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  visibility: hidden;
  pointer-events: none;
  opacity: 0;
  transform: translateX(calc(100% + 22px)) scale(0.97);
  filter: blur(6px);
  transition:
    opacity 0.28s var(--ease-smooth),
    transform 0.38s var(--ease-spring),
    filter 0.28s var(--ease-smooth),
    visibility 0s linear 0.38s;
  will-change: transform, opacity;
}

.side-drawer.open {
  visibility: visible;
  pointer-events: auto;
  opacity: 1;
  transform: translateX(0) scale(1);
  filter: blur(0px);
  transition:
    opacity 0.3s var(--ease-smooth),
    transform 0.42s var(--ease-spring),
    filter 0.3s var(--ease-smooth),
    visibility 0s linear 0s;
}

.drawer-header {
  padding: 13px 16px;
  border-bottom: 1px solid var(--glass-border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--glass-bg-subtle);
}

.drawer-title {
  font-weight: 680;
  font-size: 14px;
}

.drawer-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.drawer-body {
  flex: 1;
  overflow-y: auto;
  padding: 14px;
}

.drawer-hl-card {
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--glass-border);
  margin-bottom: 10px;
  background: var(--glass-bg-subtle);
  animation: fadeSlideUp 0.3s var(--ease-spring) both;
  transition:
    transform 0.24s var(--ease-spring),
    background 0.22s ease,
    opacity 0.24s ease;
}

.drawer-hl-card:hover {
  background: var(--glass-bg-hover);
  transform: translateY(-1px);
}

/* Writing Editor */
.writing-editor {
  width: 100%;
  min-height: 360px;
  padding: 16px 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg-input);
  backdrop-filter: var(--blur-std);
  -webkit-backdrop-filter: var(--blur-std);
  box-shadow: inset 0 1px 3px rgba(15, 23, 42, 0.04), var(--glass-rim);
  color: var(--text-main);
  font-size: 15px;
  line-height: 1.78;
  resize: vertical;
  outline: none;
  transition:
    border-color 0.24s var(--ease-spring),
    box-shadow 0.24s var(--ease-spring),
    background 0.24s var(--ease-smooth);
}

.writing-editor:focus {
  border-color: var(--accent);
  background: var(--glass-bg-hover);
  box-shadow: 0 0 0 3.5px var(--accent-glow), var(--glass-rim);
}

/* Toast Notification (Spring Slide-In & Smooth Exit) */
.toast-container {
  position: fixed;
  bottom: 68px;
  right: 20px;
  z-index: 10000;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}

.toast-msg {
  background: var(--glass-popover-bg);
  backdrop-filter: var(--blur-heavy);
  -webkit-backdrop-filter: var(--blur-heavy);
  color: var(--text-main);
  padding: 10px 16px;
  border-radius: var(--radius-pill);
  font-size: 13px;
  font-weight: 580;
  box-shadow: var(--shadow-glass-lg);
  border: 1px solid var(--glass-border);
  display: flex;
  align-items: center;
  gap: 8px;
  animation: toastSpringIn 0.34s var(--ease-spring) forwards;
  transition:
    opacity 0.26s var(--ease-smooth),
    transform 0.28s var(--ease-spring),
    filter 0.26s var(--ease-smooth);
}

.toast-msg.toast-leaving {
  opacity: 0;
  transform: translateY(8px) scale(0.94);
  filter: blur(4px);
}

@keyframes toastSpringIn {
  from {
    opacity: 0;
    transform: translateY(14px) scale(0.92);
    filter: blur(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
    filter: blur(0px);
  }
}

/* Scrollbar refinement */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-thumb {
  background: rgba(148, 163, 184, 0.35);
  border-radius: 999px;
}
::-webkit-scrollbar-track {
  background: transparent;
}

/* ============================================================================
   NATIVE LIQUID GLASS QUESTION TABLES, FLOW-CHARTS & SPATIAL MAP GRIDS
   (Theme-Adaptive across Light, Warm Sepia & Dark Modes — Zero Image Artifacts)
   ============================================================================ */
.glass-table-wrap {
  margin: 14px 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg-subtle);
  backdrop-filter: var(--blur-std);
  -webkit-backdrop-filter: var(--blur-std);
  box-shadow: var(--shadow-glass-sm), var(--glass-rim);
  overflow-x: auto;
  padding: 14px 16px;
  transition: background 0.3s var(--ease-smooth), border-color 0.3s var(--ease-smooth);
}

.glass-table-title {
  font-size: 14.5px;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.01em;
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--glass-border-subtle);
  display: flex;
  align-items: center;
  gap: 8px;
}

.glass-table-title::before {
  content: "";
  width: 4px;
  height: 15px;
  border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent-glow);
}

.glass-question-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-size: 13.8px;
  line-height: 1.68;
  color: var(--text-main);
}

.glass-question-table th {
  text-align: left;
  padding: 10px 13px;
  font-size: 12.5px;
  font-weight: 680;
  color: var(--accent);
  background: var(--accent-tint);
  border-bottom: 1px solid var(--glass-border);
  white-space: nowrap;
}

.glass-question-table th:first-child {
  border-top-left-radius: var(--radius-xs);
}

.glass-question-table th:last-child {
  border-top-right-radius: var(--radius-xs);
}

.glass-question-table td {
  padding: 11px 13px;
  vertical-align: top;
  border-bottom: 1px solid var(--glass-border-subtle);
  border-right: 1px solid var(--glass-border-subtle);
  background: transparent;
  color: var(--text-main);
  transition: background 0.2s var(--ease-smooth);
}

.glass-question-table td:last-child {
  border-right: none;
}

.glass-question-table tbody tr:last-child td {
  border-bottom: none;
}

.glass-question-table tbody tr:hover td {
  background: var(--glass-bg-hover);
}

.glass-question-table td.table-row-key {
  font-weight: 660;
  color: var(--text-main);
  background: color-mix(in srgb, var(--glass-bg-elevated) 55%, transparent);
  min-width: 110px;
}

/* Native Liquid Glass Flow-chart */
.glass-flowchart {
  margin: 14px 0;
  padding: 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg-subtle);
  backdrop-filter: var(--blur-std);
  -webkit-backdrop-filter: var(--blur-std);
  box-shadow: var(--shadow-glass-sm), var(--glass-rim);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.flowchart-step-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 15px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg-elevated);
  box-shadow: var(--glass-rim);
  transition: transform 0.24s var(--ease-spring), border-color 0.24s ease, background 0.24s ease;
}

.flowchart-step-card:hover {
  border-color: color-mix(in srgb, var(--accent) 42%, var(--glass-border));
  transform: translateX(3px);
}

.flowchart-step-badge {
  flex-shrink: 0;
  font-size: 11.5px;
  font-weight: 680;
  color: var(--accent);
  background: var(--accent-tint);
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  border: 1px solid color-mix(in srgb, var(--accent) 26%, transparent);
}

.flowchart-step-body {
  flex: 1;
  font-size: 14px;
  line-height: 1.72;
  color: var(--text-main);
}

.flowchart-arrow {
  text-align: center;
  font-size: 15px;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
  padding: 2px 0;
  user-select: none;
}

/* Spatial Map Compass Grid & Letter Directory */
.compass-cell-tag {
  font-size: 11px;
  font-weight: 660;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.compass-cell-body {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text-main);
}

.map-letter-directory {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--glass-border-subtle);
}

.map-letter-dir-title {
  font-size: 12.5px;
  font-weight: 680;
  color: var(--accent);
  margin-bottom: 8px;
}

.map-letter-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 8px;
}

.map-letter-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 8px 11px;
  border-radius: var(--radius-xs);
  border: 1px solid var(--glass-border-subtle);
  background: var(--glass-bg-elevated);
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--text-secondary);
}

/* ============================================================================
   GLOBAL LIQUID GLASS AUTH MODAL, USER CAPSULE & ACCOUNT POPOVER
   ============================================================================ */
.header-auth-area {
  position: relative;
  display: flex;
  align-items: center;
  gap: 8px;
}

.user-capsule-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 36px;
  padding: 3px 13px 3px 5px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg-elevated);
  backdrop-filter: var(--blur-std);
  -webkit-backdrop-filter: var(--blur-std);
  box-shadow: var(--shadow-glass-sm);
  cursor: pointer;
  transition:
    transform 0.24s var(--ease-bounce),
    border-color 0.22s var(--ease-smooth),
    background 0.22s var(--ease-smooth),
    box-shadow 0.24s var(--ease-smooth);
}

.user-capsule-btn:hover {
  border-color: var(--accent);
  background: var(--glass-bg-hover);
  transform: translateY(-1px);
  box-shadow: 0 6px 18px -4px var(--accent-glow), var(--glass-rim);
}

.user-capsule-btn:active {
  transform: scale(0.96);
}

.user-avatar-dot {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #ffffff;
  font-size: 12.5px;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px var(--accent-glow);
}

.user-capsule-name {
  font-size: 13px;
  font-weight: 600;
  max-width: 112px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.user-menu-popover {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  width: 244px;
  padding: 14px;
  z-index: 950;
}

.user-menu-email {
  font-size: 12px;
  color: var(--text-muted);
  word-break: break-all;
  margin-top: 2px;
}

.auth-modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 2200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: rgba(15, 23, 42, 0.28);
  backdrop-filter: blur(18px) saturate(165%);
  -webkit-backdrop-filter: blur(18px) saturate(165%);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition:
    opacity 0.28s var(--ease-smooth),
    visibility 0.28s var(--ease-smooth);
}

html[data-theme="dark"] .auth-modal-backdrop,
body.theme-dark .auth-modal-backdrop {
  background: rgba(2, 6, 23, 0.56);
}

.auth-modal-backdrop.open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.auth-modal-card {
  width: 100%;
  max-width: 416px;
  border-radius: var(--radius-lg);
  padding: 24px 26px 26px;
  background: var(--glass-popover-bg);
  backdrop-filter: var(--blur-heavy);
  -webkit-backdrop-filter: var(--blur-heavy);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-glass-lg);
  transform: translate3d(0, 18px, 0) scale(0.95);
  transition: transform 0.36s var(--ease-spring);
}

.auth-modal-backdrop.open .auth-modal-card {
  transform: translate3d(0, 0, 0) scale(1);
}

.auth-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 18px;
}

.auth-brand-tag {
  font-size: 11px;
  font-weight: 720;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 4px;
}

.auth-modal-title {
  font-size: 19px;
  font-weight: 720;
  color: var(--text-main);
  line-height: 1.3;
}

.auth-modal-sub {
  font-size: 12.5px;
  color: var(--text-secondary);
  margin-top: 4px;
  line-height: 1.5;
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 13px;
}

.auth-field {
  display: flex;
  flex-direction: column;
  gap: 5px;
  animation: fadeSlideUp 0.24s var(--ease-spring);
}

@keyframes fadeSlideUp {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.auth-otp-row {
  display: flex;
  gap: 8px;
  align-items: center;
}

.auth-code-input {
  flex: 1;
  letter-spacing: 3px;
  font-weight: 680;
  font-variant-numeric: tabular-nums;
}

.otp-send-btn {
  height: 38px;
  min-width: 112px;
  padding: 0 14px;
  border-radius: var(--radius-sm);
  font-size: 12.5px;
}

.auth-pw-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.auth-pw-wrap .glass-input {
  padding-right: 38px;
}

.auth-pw-eye {
  position: absolute;
  right: 8px;
  background: transparent;
  border: none;
  cursor: pointer;
  font-size: 14px;
  opacity: 0.55;
  padding: 4px;
  transition: opacity 0.2s ease, transform 0.2s var(--ease-bounce);
}

.auth-pw-eye:hover {
  opacity: 0.95;
  transform: scale(1.08);
}

.auth-link-btn {
  background: none;
  border: none;
  padding: 0;
  font-size: 12px;
  font-weight: 560;
  color: var(--accent);
  cursor: pointer;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.auth-link-btn:hover {
  opacity: 0.8;
  text-decoration: underline;
}

.auth-submode-row {
  display: flex;
  justify-content: flex-start;
  margin-top: -2px;
}

.auth-feedback {
  font-size: 12.5px;
  line-height: 1.5;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--glass-border);
  background: var(--danger-tint);
  color: var(--danger);
}

.auth-feedback.ok {
  background: var(--success-tint);
  color: var(--success);
}

.auth-submit-btn {
  width: 100%;
  height: 40px;
  font-size: 14px;
  font-weight: 650;
  margin-top: 4px;
}