/* ==========================================================================
   USTOZHUB DESIGN SYSTEM & TOKEN ARCHITECTURE (WCAG 2.1 AA Compliant)
   Framework: UI/UX Audit & 7-Skill Design Engine
   ========================================================================== */

:root {
  /* Surface Tokens (Dark Mode by default) */
  --bg-canvas: #090a13;
  --bg-surface: #101221;
  --bg-surface-elevated: #16192e;
  --bg-surface-glass: rgba(18, 21, 38, 0.72);
  --bg-card: rgba(255, 255, 255, 0.05);

  /* Text & Content Tokens */
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-inverse: #090a13;

  /* Border Tokens */
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-default: rgba(255, 255, 255, 0.14);
  --border-strong: rgba(255, 255, 255, 0.28);
  --focus-ring: #22d3a6;

  /* Accent & Semantic Brand Tokens */
  --accent-primary: #7c5cff;
  --accent-primary-hover: #6c47ff;
  --accent-secondary: #22d3a6;
  --accent-secondary-hover: #1abc9c;
  --accent-warm: #ff7a59;
  --grad: linear-gradient(135deg, #7c5cff 0%, #22d3a6 100%);
  --grad-hover: linear-gradient(135deg, #6c47ff 0%, #1abc9c 100%);

  /* State Tokens */
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;
  --color-info: #3b82f6;

  /* Spatial Scale (8px Grid Rhythm) */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;

  /* Radii */
  --r-xs: 6px;
  --r-sm: 10px;
  --r-md: 14px;
  --r-lg: 20px;
  --r-xl: 28px;
  --r-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 40px rgba(124, 92, 255, 0.25);

  /* Animation Easing */
  --ease-spring: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
  /* Surface Tokens (Light Mode - High Contrast WCAG AA) */
  --bg-canvas: #f8faff;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #f1f5f9;
  --bg-surface-glass: rgba(255, 255, 255, 0.85);
  --bg-card: rgba(255, 255, 255, 0.95);

  /* Text Tokens */
  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-inverse: #f8fafc;

  /* Border Tokens */
  --border-subtle: rgba(15, 23, 42, 0.08);
  --border-default: rgba(15, 23, 42, 0.14);
  --border-strong: rgba(15, 23, 42, 0.24);
  --focus-ring: #059669;

  /* Accent */
  --accent-primary: #6343f4;
  --accent-secondary: #059669;
  --grad: linear-gradient(135deg, #6343f4 0%, #059669 100%);
  --grad-hover: linear-gradient(135deg, #5333e0 0%, #047857 100%);

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 20px 40px rgba(15, 23, 42, 0.12);
  --shadow-glow: 0 0 35px rgba(99, 67, 244, 0.15);
}

/* Base Resets */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: Inter, system-ui, -apple-system, sans-serif;
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color 0.25s var(--ease-smooth), color 0.25s var(--ease-smooth);
}

h1, h2, h3, h4, .logo, .price, .pprice, .hero__big, b {
  font-family: Outfit, Inter, sans-serif;
  font-weight: 700;
  letter-spacing: -0.02em;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s var(--ease-smooth);
}

button, input, select, textarea {
  font: inherit;
  color: inherit;
  border: 0;
  background: transparent;
}

/* Accessibility: Skip to Content */
.skip-link {
  position: absolute;
  top: -60px;
  left: 20px;
  background: var(--accent-secondary);
  color: #000;
  padding: 10px 18px;
  border-radius: var(--r-sm);
  font-weight: 700;
  z-index: 1000;
  transition: top 0.2s var(--ease-smooth);
}
.skip-link:focus {
  top: 15px;
}

/* Accessibility: Universal Focus Ring */
:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 3px;
  border-radius: 4px;
}

/* Container */
.container {
  width: min(1200px, 92%);
  margin-inline: auto;
}

.section {
  padding-block: var(--space-12);
}

/* Ambient Gradients */
.grad {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  display: inline;
}

.glass {
  background: var(--bg-surface-glass);
  border: 1px solid var(--border-default);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-sm);
  transition: border-color 0.2s var(--ease-smooth), box-shadow 0.2s var(--ease-smooth);
}

/* Ambient Floating Orbs */
.bg-orbs span {
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.3;
  z-index: -1;
  pointer-events: none;
  animation: drift 20s ease-in-out infinite alternate;
}
.bg-orbs span:nth-child(1) { width: 500px; height: 500px; background: var(--accent-primary); top: -140px; left: -100px; }
.bg-orbs span:nth-child(2) { width: 440px; height: 440px; background: var(--accent-secondary); top: 38%; right: -120px; animation-delay: -6s; }
.bg-orbs span:nth-child(3) { width: 400px; height: 400px; background: var(--accent-warm); bottom: -120px; left: 25%; animation-delay: -12s; opacity: 0.18; }
@keyframes drift { to { transform: translate(60px, 40px) scale(1.15); } }

/* ==========================================================================
   NAVIGATION
   ========================================================================== */
.nav {
  position: sticky;
  top: 0;
  z-index: 60;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  background: color-mix(in srgb, var(--bg-canvas) 80%, transparent);
  border-bottom: 1px solid var(--border-subtle);
  height: 72px;
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: var(--space-4);
}
.logo {
  font-size: 1.45rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.logo b {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.logo__mark {
  width: 38px;
  height: 38px;
  border-radius: 12px;
  background: var(--grad);
  display: grid;
  place-items: center;
  color: #fff;
  font-weight: 800;
  box-shadow: 0 4px 14px rgba(124, 92, 255, 0.35);
}

.nav__links {
  display: flex;
  gap: var(--space-6);
}
.nav__links a {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 6px 4px;
  position: relative;
  transition: color 0.2s var(--ease-smooth);
}
.nav__links a:hover {
  color: var(--text-primary);
}
.nav__links a.active {
  color: var(--text-primary);
  font-weight: 600;
}
.nav__links a.active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -4px;
  height: 2px;
  border-radius: var(--r-full);
  background: var(--grad);
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* Touch Targets: min 44x44px */
.icon-btn {
  width: 44px;
  height: 44px;
  border-radius: var(--r-sm);
  border: 1px solid var(--border-default);
  background: var(--bg-card);
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: transform 0.2s var(--ease-spring), border-color 0.2s var(--ease-smooth), background 0.2s var(--ease-smooth);
  font-size: 1.1rem;
}
.icon-btn:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
  background: var(--bg-surface-elevated);
}
.icon-btn:active {
  transform: scale(0.95);
}
.burger {
  display: none;
}

/* ==========================================================================
   BUTTON SYSTEM (IxD Micro-interactions)
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 44px;
  padding: 12px 24px;
  border-radius: var(--r-md);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  text-align: center;
  transition: transform 0.2s var(--ease-spring), box-shadow 0.2s var(--ease-smooth), background 0.2s var(--ease-smooth), border-color 0.2s var(--ease-smooth);
  user-select: none;
}
.btn:active {
  transform: scale(0.97);
}
.btn--sm {
  min-height: 38px;
  padding: 8px 16px;
  font-size: 0.88rem;
  border-radius: var(--r-sm);
}
.btn--primary {
  background: var(--grad);
  color: #070e17;
  font-weight: 700;
  box-shadow: 0 8px 24px rgba(34, 211, 166, 0.24);
  border: 1px solid transparent;
}
.btn--primary:hover {
  background: var(--grad-hover);
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(124, 92, 255, 0.35);
}
.btn--ghost {
  background: transparent;
  border: 1px solid var(--border-default);
  color: var(--text-primary);
}
.btn--ghost:hover {
  background: var(--bg-card);
  border-color: var(--border-strong);
  transform: translateY(-2px);
}
.btn:disabled, .btn[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none !important;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--r-full);
  border: 1px solid var(--border-default);
  background: var(--bg-card);
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
}
.chip--glow {
  color: var(--accent-secondary);
  border-color: rgba(34, 211, 166, 0.35);
  background: rgba(34, 211, 166, 0.08);
}
.chip--ok {
  color: var(--color-success);
  border-color: rgba(16, 185, 129, 0.3);
  background: rgba(16, 185, 129, 0.08);
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */
.hero {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: var(--space-10);
  align-items: center;
  padding-block: var(--space-16) var(--space-10);
}
.hero h1 {
  font-size: clamp(2.4rem, 4.8vw, 3.8rem);
  line-height: 1.1;
  margin: var(--space-4) 0;
}
.lead {
  color: var(--text-secondary);
  font-size: 1.125rem;
  max-width: 540px;
  line-height: 1.6;
}

.search {
  display: flex;
  gap: var(--space-2);
  margin: var(--space-6) 0 var(--space-3);
  padding: 6px;
  border-radius: var(--r-lg);
  max-width: 540px;
  background: var(--bg-surface-glass);
  border: 1.5px solid var(--border-default);
  box-shadow: var(--shadow-sm);
  transition: border-color 0.2s var(--ease-smooth);
}
.search:focus-within {
  border-color: var(--accent-secondary);
  box-shadow: 0 0 0 3px rgba(34, 211, 166, 0.15);
}
.search input {
  flex: 1;
  padding-inline: var(--space-4);
  font-size: 1rem;
  color: var(--text-primary);
  outline: 0;
}
.search input::placeholder {
  color: var(--text-muted);
}

.quick {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
  align-items: center;
}
.quick button {
  padding: 6px 14px;
  min-height: 36px;
  border-radius: var(--r-full);
  border: 1px solid var(--border-default);
  background: var(--bg-card);
  font-size: 0.85rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s var(--ease-spring);
}
.quick button:hover {
  border-color: var(--accent-secondary);
  color: var(--accent-secondary);
  transform: translateY(-2px);
}

.stats {
  display: flex;
  gap: var(--space-8);
  margin-top: var(--space-8);
  border-top: 1px solid var(--border-subtle);
  padding-top: var(--space-6);
}
.stats b {
  font-size: 2.1rem;
  display: block;
  line-height: 1.1;
  color: var(--text-primary);
}
.stats span {
  color: var(--text-muted);
  font-size: 0.88rem;
}

.hero__visual {
  position: relative;
  height: 420px;
  display: grid;
  place-items: center;
}
.hero__circle {
  width: 290px;
  height: 290px;
  border-radius: 50%;
  background: var(--grad);
  display: grid;
  place-items: center;
  box-shadow: var(--shadow-glow);
  animation: pulseOrb 6s ease-in-out infinite;
}
@keyframes pulseOrb {
  50% { transform: scale(1.05); filter: brightness(1.08); }
}
.hero__big {
  font-size: 6.8rem;
  font-weight: 800;
  color: #fff;
  opacity: 0.95;
  user-select: none;
}

.float-card {
  position: absolute;
  padding: 12px 18px;
  display: flex;
  gap: 12px;
  align-items: center;
  font-size: 0.9rem;
  box-shadow: var(--shadow-md);
  animation: floatCard 6s ease-in-out infinite;
  border-radius: var(--r-md);
}
.float-card small {
  color: var(--text-muted);
  font-size: 0.8rem;
}
.fc1 { top: 20px; left: 0; }
.fc2 { bottom: 50px; left: -10px; animation-delay: -2s; }
.fc3 { top: 120px; right: -10px; animation-delay: -4s; }
@keyframes floatCard {
  50% { transform: translateY(-12px); }
}

.avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--a), var(--b));
  display: grid;
  place-items: center;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
  user-select: none;
}
.avatar.big {
  width: 80px;
  height: 80px;
  font-size: 1.6rem;
}

/* ==========================================================================
   CATEGORIES GRID
   ========================================================================== */
.cats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: var(--space-4);
}
.cat {
  padding: var(--space-5) var(--space-3);
  text-align: center;
  cursor: pointer;
  border-radius: var(--r-md);
  transition: transform 0.25s var(--ease-spring), border-color 0.2s var(--ease-smooth), box-shadow 0.2s var(--ease-smooth);
  display: block;
}
.cat:hover {
  transform: translateY(-6px);
  border-color: var(--accent-secondary);
  box-shadow: var(--shadow-md);
}
.cat span {
  font-size: 2.2rem;
  display: block;
  margin-bottom: var(--space-2);
}
.cat small {
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--text-primary);
  display: block;
}

.section__head {
  text-align: center;
  margin-bottom: var(--space-8);
}
.section__head h1, .section__head h2, .two h2, .cta h2 {
  font-size: clamp(1.9rem, 3.5vw, 2.7rem);
  line-height: 1.2;
}
.section__head p {
  color: var(--text-muted);
  margin-top: var(--space-2);
  font-size: 1.05rem;
}

/* ==========================================================================
   TUTORS SEARCH PAGE & FILTERS (Preply Pattern)
   ========================================================================== */
.tpage {
  padding-top: var(--space-6);
}
.sfilters {
  display: grid;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}
.frow {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}
.r1 .fbox {
  flex: 1;
  min-width: 210px;
}
.fbox {
  position: relative;
  border: 1.5px solid var(--border-default);
  border-radius: var(--r-md);
  background: var(--bg-surface-glass);
  backdrop-filter: blur(12px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 8px 16px;
  min-height: 60px;
  transition: border-color 0.2s var(--ease-smooth), box-shadow 0.2s var(--ease-smooth);
}
.fbox:hover, .fbox:focus-within {
  border-color: var(--accent-secondary);
  box-shadow: 0 0 0 3px rgba(34, 211, 166, 0.12);
}
.fbox small {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 500;
}
.fbox select, .fbox input {
  border: 0;
  outline: 0;
  background: transparent;
  font-weight: 600;
  font-size: 0.95rem;
  width: 100%;
  appearance: none;
  -webkit-appearance: none;
  cursor: pointer;
  padding-right: 24px;
  color: var(--text-primary);
  background-image: linear-gradient(45deg, transparent 50%, var(--text-primary) 50%), linear-gradient(135deg, var(--text-primary) 50%, transparent 50%);
  background-position: calc(100% - 12px) 55%, calc(100% - 7px) 55%;
  background-size: 5px 5px;
  background-repeat: no-repeat;
}
.fbox select option {
  background: var(--bg-surface);
  color: var(--text-primary);
}
.fbox input {
  background-image: none;
  cursor: text;
  padding-right: 0;
}
.fbox.small {
  padding: 0 16px;
  height: 52px;
  min-height: 52px;
}
.fbox.search {
  flex-direction: row;
  align-items: center;
  gap: var(--space-2);
  min-width: 300px;
}
.grow {
  flex: 1;
}

.listtitle {
  font-size: clamp(1.3rem, 2.2vw, 1.8rem);
  margin-bottom: var(--space-5);
  color: var(--text-primary);
}

.slayout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 380px;
  gap: var(--space-6);
  align-items: start;
}
.slist {
  display: grid;
  gap: var(--space-5);
}

/* Tutor Card */
.pcard {
  border: 1.5px solid var(--border-default);
  border-radius: var(--r-lg);
  background: var(--bg-surface-glass);
  backdrop-filter: blur(14px);
  padding: var(--space-6);
  display: grid;
  grid-template-columns: 160px 1fr 260px;
  gap: var(--space-6);
  transition: border-color 0.25s var(--ease-smooth), transform 0.25s var(--ease-spring), box-shadow 0.25s var(--ease-smooth);
  cursor: pointer;
  position: relative;
}
.pcard:hover {
  border-color: rgba(124, 92, 255, 0.6);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}
.pcard.sel {
  border-color: var(--accent-secondary);
  box-shadow: 0 0 0 3px rgba(34, 211, 166, 0.18), var(--shadow-md);
}

.photo {
  width: 160px;
  height: 160px;
  border-radius: var(--r-md);
  background: linear-gradient(135deg, var(--a), var(--b));
  display: grid;
  place-items: center;
  color: #fff;
  font-size: 2.8rem;
  font-weight: 700;
  font-family: Outfit;
  user-select: none;
}

.info h3 {
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.shield {
  display: inline-grid;
  place-items: center;
  width: 20px;
  height: 20px;
  background: var(--accent-secondary);
  color: #070e17;
  font-size: 0.72rem;
  border-radius: 50%;
  font-weight: 900;
}
.badges {
  margin-top: 6px;
  display: flex;
  gap: 8px;
  font-weight: 600;
  font-size: 0.88rem;
  color: var(--accent-secondary);
}
.badges .dot {
  color: var(--text-muted);
}
.pline {
  margin-top: 6px;
  display: flex;
  gap: 8px;
  color: var(--text-secondary);
  font-size: 0.95rem;
}
.pline em {
  font-style: normal;
}
.tag {
  display: inline-block;
  margin-top: 10px;
  padding: 4px 12px;
  border-radius: var(--r-sm);
  font-weight: 600;
  font-size: 0.82rem;
  background: rgba(124, 92, 255, 0.18);
  color: #c4b5fd;
}
[data-theme="light"] .tag {
  color: #5b21b6;
  background: rgba(99, 67, 244, 0.12);
}
.bio {
  margin-top: 10px;
  line-height: 1.55;
  color: var(--text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.more {
  margin-top: 6px;
  font-weight: 600;
  text-decoration: underline;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
  color: var(--accent-secondary);
}
.pop {
  margin-top: 10px;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.buy {
  display: flex;
  flex-direction: column;
}
.buy__top {
  display: flex;
  justify-content: space-between;
}
.pprice {
  font-size: 2.1rem;
  line-height: 1;
}
.pprice small {
  display: block;
  font-family: Inter, sans-serif;
  font-size: 0.88rem;
  font-weight: 400;
  color: var(--text-muted);
  margin-top: 6px;
}
.heart {
  min-width: 44px;
  min-height: 44px;
  border-radius: var(--r-sm);
  display: grid;
  place-items: center;
  font-size: 1.5rem;
  cursor: pointer;
  transition: transform 0.2s var(--ease-spring);
}
.heart:hover {
  transform: scale(1.2);
}
.pstats {
  display: flex;
  gap: var(--space-4);
  margin: var(--space-5) 0 var(--space-4);
}
.pstats b {
  display: block;
  font-size: 1.15rem;
}
.pstats span {
  color: var(--text-muted);
  font-size: 0.85rem;
}
.buy .btn {
  width: 100%;
}
.buy .btn + .btn {
  margin-top: var(--space-2);
}

.sside {
  position: sticky;
  top: 90px;
}
.sside__box {
  padding: var(--space-5);
}
.video {
  position: relative;
  aspect-ratio: 16/10;
  border-radius: var(--r-md);
  background: linear-gradient(135deg, var(--a), var(--b));
  display: grid;
  place-items: center;
  color: #fff;
  font-family: Outfit;
  font-size: 3.5rem;
  font-weight: 700;
  overflow: hidden;
}
.video .play {
  position: absolute;
  right: 14px;
  bottom: 14px;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: #fff;
  color: #070e17;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
  transition: transform 0.2s var(--ease-spring);
}
.video .play:hover {
  transform: scale(1.12);
}
.video.playing .play {
  display: none;
}
.video .wave {
  display: none;
  position: absolute;
  inset: auto 0 16px;
  justify-content: center;
  gap: 5px;
  align-items: flex-end;
  height: 30px;
}
.video.playing .wave {
  display: flex;
}
.wave i {
  width: 5px;
  background: #fff;
  border-radius: 3px;
  animation: wv 0.8s ease-in-out infinite;
}
.wave i:nth-child(2n) { animation-delay: 0.2s; }
.wave i:nth-child(3n) { animation-delay: 0.4s; }
@keyframes wv {
  0%, 100% { height: 6px; }
  50% { height: 26px; }
}

.sside .btn {
  width: 100%;
  margin-top: var(--space-3);
}
.sside .btn:first-of-type {
  margin-top: var(--space-5);
}

.empty {
  padding: 60px 20px;
  text-align: center;
  color: var(--text-muted);
  border: 2px dashed var(--border-default);
  border-radius: var(--r-lg);
  display: grid;
  gap: 12px;
  place-items: center;
}

/* ==========================================================================
   HOW IT WORKS & PARENTS DASHBOARD
   ========================================================================== */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-4);
}
.step {
  padding: var(--space-6);
  transition: transform 0.25s var(--ease-spring);
}
.step:hover {
  transform: translateY(-6px);
}
.step i {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: var(--r-sm);
  background: var(--grad);
  color: #070e17;
  font-weight: 800;
  font-style: normal;
  margin-bottom: var(--space-4);
}
.step h3 {
  font-size: 1.25rem;
  margin-bottom: 6px;
}
.step p {
  color: var(--text-muted);
  font-size: 0.92rem;
}

.two {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: center;
}
.two h2 {
  margin: var(--space-3) 0 var(--space-4);
}
.ticks {
  list-style: none;
  display: grid;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}
.ticks li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  color: var(--text-secondary);
}
.ticks li::before {
  content: "✓";
  color: var(--accent-secondary);
  font-weight: 800;
  flex-shrink: 0;
}

.toggle {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-bottom: var(--space-4);
  cursor: pointer;
  user-select: none;
  min-height: 44px;
}
.toggle input {
  display: none;
}
.toggle span {
  width: 48px;
  height: 28px;
  border-radius: var(--r-full);
  background: var(--border-strong);
  position: relative;
  transition: background 0.25s var(--ease-smooth);
}
.toggle span::after {
  content: "";
  position: absolute;
  top: 3px;
  left: 3px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: #fff;
  transition: transform 0.25s var(--ease-spring);
  box-shadow: var(--shadow-sm);
}
.toggle input:checked + span {
  background: var(--accent-secondary);
}
.toggle input:checked + span::after {
  transform: translateX(20px);
}

.dash {
  padding: var(--space-6);
}
.dash__head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-5);
}
.kpis {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}
.kpis div {
  padding: var(--space-4);
  border-radius: var(--r-md);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  text-align: center;
}
.kpis b {
  font-size: 1.6rem;
  display: block;
  line-height: 1.1;
  color: var(--text-primary);
}
.kpis small {
  color: var(--text-muted);
  font-size: 0.85rem;
}
.bars {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  height: 130px;
  margin-bottom: var(--space-5);
}
.bars i {
  flex: 1;
  border-radius: 6px 6px 0 0;
  background: var(--grad);
  height: 0;
  transition: height 1s var(--ease-spring);
}
.note {
  padding: var(--space-4);
  border-radius: var(--r-md);
  background: rgba(34, 211, 166, 0.1);
  border-left: 3px solid var(--accent-secondary);
  font-size: 0.92rem;
  color: var(--text-secondary);
}

/* ==========================================================================
   CLASSROOM SHOWCASE CARD (Home)
   ========================================================================== */
.cshowcase {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--space-10);
  padding: var(--space-10);
  align-items: center;
}
.cshowcase__text h2 {
  margin: var(--space-3) 0 var(--space-4);
}
.cshowcase__text .ticks {
  margin: var(--space-4) 0 var(--space-6);
}
.cshowcase__visual {
  display: flex;
  justify-content: center;
}
.cshowcase__card {
  width: 100%;
  max-width: 440px;
  padding: var(--space-5);
  border-radius: var(--r-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  box-shadow: var(--shadow-lg);
}
.cshowcase__badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--color-danger);
  background: rgba(239, 68, 68, 0.12);
  padding: 4px 10px;
  border-radius: var(--r-full);
  align-self: flex-start;
}
.cshowcase__mock-vids {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.mock-vid {
  height: 84px;
  border-radius: var(--r-sm);
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  font-size: 0.78rem;
}
.mock-vid b {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--a), var(--b));
  display: grid;
  place-items: center;
  color: #fff;
  font-size: 0.85rem;
}
.cshowcase__mock-board {
  height: 120px;
  border-radius: var(--r-sm);
  background: #090b14;
  border: 1px dashed var(--border-default);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px;
  text-align: center;
}
[data-theme="light"] .cshowcase__mock-board {
  background: #fff;
}
.cshowcase__mock-board p {
  font-size: 0.9rem;
  color: var(--accent-secondary);
  font-weight: 600;
}
.mock-pencil {
  position: absolute;
  top: 10px;
  right: 10px;
  font-size: 1.1rem;
}
.cshowcase__chips {
  display: flex;
  gap: 8px;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-muted);
}
.cshowcase__chips span {
  padding: 4px 10px;
  border-radius: var(--r-xs);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
}

/* ==========================================================================
   PRICING PLANS
   ========================================================================== */
.plans {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-5);
}
.plan {
  padding: var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  position: relative;
  transition: transform 0.25s var(--ease-spring), border-color 0.2s var(--ease-smooth);
}
.plan:hover {
  transform: translateY(-8px);
}
.plan--pop {
  border-color: var(--accent-secondary);
  box-shadow: 0 0 50px rgba(34, 211, 166, 0.2);
}
.plan .price {
  font-size: 2.1rem;
}
.plan ul {
  list-style: none;
  color: var(--text-secondary);
  display: grid;
  gap: var(--space-2);
  flex: 1;
}
.plan li::before {
  content: "✓ ";
  color: var(--accent-secondary);
  font-weight: 800;
}
.badge {
  position: absolute;
  top: -12px;
  right: 20px;
  background: var(--grad);
  color: #070e17;
  padding: 4px 14px;
  border-radius: var(--r-full);
  font-size: 0.78rem;
  font-weight: 700;
  box-shadow: var(--shadow-sm);
}
.pay-logos {
  display: flex;
  gap: var(--space-3);
  justify-content: center;
  margin-top: var(--space-8);
  flex-wrap: wrap;
}
.pay-logos span {
  padding: 8px 18px;
  border-radius: var(--r-sm);
  border: 1px solid var(--border-default);
  background: var(--bg-card);
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* CTA */
.cta {
  text-align: center;
  padding: var(--space-12) var(--space-5);
  background: linear-gradient(135deg, rgba(124, 92, 255, 0.22), rgba(34, 211, 166, 0.16));
}
.cta p {
  color: var(--text-secondary);
  margin: var(--space-3) 0 var(--space-6);
  font-size: 1.1rem;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-subtle);
  padding: var(--space-8) 0;
  margin-top: var(--space-8);
  background: color-mix(in srgb, var(--bg-canvas) 90%, transparent);
}
.footer__in {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
  color: var(--text-muted);
  font-size: 0.92rem;
}

/* ==========================================================================
   MODAL SYSTEM (Accessible Dialog)
   ========================================================================== */
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(5, 6, 15, 0.75);
  backdrop-filter: blur(8px);
  z-index: 100;
  display: grid;
  place-items: center;
  padding: var(--space-4);
  animation: fadeIn 0.2s var(--ease-smooth);
}
.overlay[hidden] {
  display: none;
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
.modal {
  width: min(540px, 100%);
  max-height: 92vh;
  overflow-y: auto;
  padding: var(--space-8);
  position: relative;
  background: var(--bg-surface);
  border-radius: var(--r-lg);
  border: 1px solid var(--border-default);
  box-shadow: var(--shadow-lg);
  animation: popIn 0.25s var(--ease-spring);
}
@keyframes popIn {
  from { transform: scale(0.95); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}
.modal__x {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 44px;
  height: 44px;
  border-radius: var(--r-sm);
  border: 1px solid var(--border-default);
  background: var(--bg-card);
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: all 0.2s var(--ease-spring);
  font-size: 1.1rem;
}
.modal__x:hover {
  border-color: var(--border-strong);
  transform: rotate(90deg);
}

.modal h3 {
  font-size: 1.45rem;
  margin-bottom: 4px;
}
.msub {
  color: var(--text-muted);
  margin-bottom: var(--space-4);
  font-size: 0.92rem;
}
.prog {
  display: flex;
  gap: 6px;
  margin: var(--space-3) 0 var(--space-5);
}
.prog i {
  flex: 1;
  height: 5px;
  border-radius: var(--r-full);
  background: var(--border-default);
}
.prog i.on {
  background: var(--grad);
}
.opts {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
  gap: 8px;
  margin-bottom: var(--space-4);
}
.opt {
  padding: 10px;
  min-height: 44px;
  text-align: center;
  border-radius: var(--r-sm);
  border: 1.5px solid var(--border-default);
  background: var(--bg-card);
  cursor: pointer;
  transition: all 0.2s var(--ease-spring);
  font-size: 0.9rem;
  user-select: none;
}
.opt:hover {
  border-color: var(--accent-secondary);
}
.opt.sel {
  background: var(--grad);
  color: #070e17;
  border-color: transparent;
  font-weight: 700;
}
.opt.wide {
  text-align: left;
  padding: 14px;
  display: block;
  width: 100%;
  margin-bottom: 8px;
}
.opt small {
  display: block;
  opacity: 0.8;
  font-size: 0.8rem;
}
.label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin: 8px 0;
  font-weight: 600;
}
.sum {
  padding: var(--space-4);
  border-radius: var(--r-md);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  display: grid;
  gap: 8px;
  font-size: 0.92rem;
  margin-bottom: var(--space-4);
}
.sum div {
  display: flex;
  justify-content: space-between;
}
.sum .tot {
  font-weight: 700;
  font-size: 1.15rem;
  border-top: 1px solid var(--border-default);
  padding-top: 8px;
}
.escrow {
  font-size: 0.82rem;
  color: var(--accent-secondary);
  margin: var(--space-2) 0 var(--space-4);
  background: rgba(34, 211, 166, 0.08);
  padding: 8px 12px;
  border-radius: var(--r-sm);
  border: 1px solid rgba(34, 211, 166, 0.2);
}
.modal .btn {
  width: 100%;
}
.modal input.field {
  width: 100%;
  min-height: 48px;
  padding: 12px 14px;
  border-radius: var(--r-sm);
  border: 1.5px solid var(--border-default);
  background: var(--bg-card);
  margin-bottom: var(--space-3);
  outline: 0;
  color: var(--text-primary);
  font-size: 1rem;
}
.modal input.field:focus {
  border-color: var(--accent-secondary);
}
.success {
  text-align: center;
  padding: var(--space-2) 0;
}
.success .tick {
  width: 76px;
  height: 76px;
  border-radius: 50%;
  background: var(--grad);
  display: grid;
  place-items: center;
  font-size: 2.2rem;
  margin: 0 auto var(--space-4);
  color: #070e17;
  font-weight: 900;
  animation: popIn 0.3s var(--ease-spring);
}
.spin {
  display: inline-block;
  width: 18px;
  height: 18px;
  border: 3px solid rgba(0, 0, 0, 0.2);
  border-top-color: #070e17;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  vertical-align: middle;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Toast Notifications (Accessible ARIA announcements) */
.toasts {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: grid;
  gap: 10px;
  z-index: 200;
  max-width: 360px;
}
.toast {
  padding: 14px 18px;
  border-radius: var(--r-md);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--accent-secondary);
  box-shadow: var(--shadow-lg);
  font-size: 0.92rem;
  line-height: 1.45;
  animation: slideToast 0.3s var(--ease-spring);
}
@keyframes slideToast {
  from { transform: translateX(120%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* Profile modal */
.profile-head {
  display: flex;
  gap: 16px;
  align-items: center;
  margin-bottom: var(--space-4);
}
.profile-head .photo {
  width: 76px;
  height: 76px;
  font-size: 1.6rem;
  flex-shrink: 0;
  border-radius: var(--r-md);
}
.rev {
  border-top: 1px solid var(--border-subtle);
  padding: 12px 0;
  font-size: 0.92rem;
  color: var(--text-secondary);
}
.rev b {
  display: block;
  color: var(--text-primary);
  margin-bottom: 2px;
}

/* ==========================================================================
   CLASSROOM PAGE STYLES (classroom.html)
   ========================================================================== */
.cbody {
  min-height: 100vh;
  background: var(--bg-canvas);
  color: var(--text-primary);
  display: flex;
  flex-direction: column;
}
.cnav {
  height: 68px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 24px;
  border-bottom: 1px solid var(--border-subtle);
  backdrop-filter: blur(16px);
  background: color-mix(in srgb, var(--bg-canvas) 85%, transparent);
  position: sticky;
  top: 0;
  z-index: 60;
}
.cnav__left, .cnav__center, .cnav__right {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}
.cnav__info {
  display: flex;
  flex-direction: column;
  border-left: 1px solid var(--border-default);
  padding-left: var(--space-3);
  margin-left: var(--space-1);
}
.cnav__subject {
  font-size: 0.92rem;
  font-weight: 700;
}
.cnav__tutor {
  font-size: 0.78rem;
  color: var(--text-muted);
}
.cnav__tutor b {
  color: var(--text-primary);
}
.clive {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  font-weight: 800;
  color: var(--color-danger);
  letter-spacing: 0.03em;
  background: rgba(239, 68, 68, 0.12);
  padding: 5px 12px;
  border-radius: var(--r-full);
}
.clive__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-danger);
  animation: blinkLive 1.2s infinite;
}
@keyframes blinkLive {
  50% { opacity: 0.2; }
}
.ctimer {
  font-family: Outfit, Inter, sans-serif;
  font-size: 1.25rem;
  font-weight: 700;
}
.net-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  color: var(--accent-secondary);
  background: rgba(34, 211, 166, 0.1);
  padding: 5px 10px;
  border-radius: var(--r-full);
  border: 1px solid rgba(34, 211, 166, 0.2);
}
.danger-link {
  color: var(--color-danger) !important;
  border-color: rgba(239, 68, 68, 0.3) !important;
}
.danger-link:hover {
  background: rgba(239, 68, 68, 0.15) !important;
}

.cworkspace {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: var(--space-4);
  padding: var(--space-4) 22px;
  flex: 1;
  max-width: 1750px;
  margin: 0 auto;
  width: 100%;
}
.cstage {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  min-width: 0;
}

/* Video grid */
.cvideo-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
}
.cvid {
  height: 150px;
  border-radius: var(--r-md);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.cvid__avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--a), var(--b));
  display: grid;
  place-items: center;
  color: #fff;
  font-weight: 800;
  font-size: 1.35rem;
  font-family: Outfit;
  transition: opacity 0.3s;
}
.cvid__avatar.cam-off {
  opacity: 0.2;
  filter: grayscale(1);
}
.cvid__meta {
  position: absolute;
  bottom: 8px;
  left: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 600;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(6px);
  padding: 4px 10px;
  border-radius: var(--r-xs);
  color: #fff;
}
.badge-ver {
  color: var(--accent-secondary);
}
.cvid__wave {
  display: flex;
  gap: 3px;
  align-items: flex-end;
  height: 12px;
}
.cvid__wave i {
  width: 3px;
  height: 100%;
  background: var(--accent-secondary);
  border-radius: 2px;
  animation: wv 0.8s ease-in-out infinite;
}
.cvid__wave i:nth-child(2) { animation-delay: 0.2s; }
.cvid__wave i:nth-child(3) { animation-delay: 0.4s; }
.cvid__tags {
  position: absolute;
  top: 8px;
  right: 10px;
  display: flex;
  gap: 6px;
  font-size: 0.85rem;
  background: rgba(0, 0, 0, 0.6);
  padding: 4px 8px;
  border-radius: var(--r-xs);
}
.cvid__screen {
  position: absolute;
  inset: 0;
  background: var(--bg-surface);
  display: grid;
  place-items: center;
}
.screen-preview {
  text-align: center;
  color: var(--accent-secondary);
}
.screen-preview small {
  display: block;
  color: var(--text-muted);
}
.hand-raised {
  color: var(--color-warning);
  font-weight: 700;
}

/* Stage View Tabs */
.cview-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.cview-tabs {
  display: flex;
  gap: 8px;
}
.cview-btn {
  padding: 8px 16px;
  min-height: 40px;
  border-radius: var(--r-sm);
  border: 1px solid var(--border-default);
  background: var(--bg-card);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 0.88rem;
  font-weight: 600;
  transition: all 0.2s var(--ease-spring);
}
.cview-btn:hover {
  border-color: var(--border-strong);
}
.cview-btn.active {
  background: var(--grad);
  color: #070e17;
  border-color: transparent;
}
.cview-extra {
  display: flex;
  gap: 8px;
}
.cview-zoom {
  padding: 6px 14px;
  min-height: 38px;
  border-radius: var(--r-xs);
  border: 1px solid var(--border-default);
  background: var(--bg-card);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 0.8rem;
  font-weight: 500;
  transition: all 0.2s var(--ease-spring);
}
.cview-zoom:hover {
  border-color: var(--border-strong);
}
.cview-zoom.active {
  border-color: var(--accent-secondary);
  color: var(--accent-secondary);
  background: rgba(34, 211, 166, 0.1);
}

.cview-content {
  display: none;
}
.cview-content.active {
  display: block;
}

/* Whiteboard toolbar */
.wb-toolbar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  border-radius: var(--r-md);
  margin-bottom: 8px;
  flex-wrap: wrap;
}
.wb-group, .wb-colors, .wb-sizes {
  display: flex;
  gap: 6px;
  align-items: center;
}
.wb-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--r-xs);
  border: 1px solid var(--border-default);
  background: var(--bg-card);
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: all 0.15s;
  font-size: 1rem;
}
.wb-btn:hover {
  border-color: var(--border-strong);
}
.wb-btn.active {
  border-color: var(--accent-secondary);
  background: rgba(34, 211, 166, 0.18);
}
.wb-sep {
  width: 1px;
  height: 20px;
  background: var(--border-default);
}
.wb-color {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--c);
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.15s;
}
.wb-color:hover {
  transform: scale(1.15);
}
.wb-color.active {
  border-color: #fff;
  transform: scale(1.25);
  box-shadow: 0 0 10px var(--c);
}
.wb-size {
  padding: 4px 10px;
  min-height: 30px;
  border-radius: var(--r-xs);
  border: 1px solid var(--border-default);
  background: var(--bg-card);
  cursor: pointer;
  font-size: 0.78rem;
  font-weight: 600;
}
.wb-size.active {
  border-color: var(--accent-secondary);
  color: var(--accent-secondary);
}
.wb-action {
  margin-left: auto;
  padding: 6px 14px;
  min-height: 34px;
  border-radius: var(--r-xs);
  border: 1px solid var(--border-default);
  background: var(--bg-card);
  cursor: pointer;
  font-size: 0.82rem;
  font-weight: 500;
  transition: all 0.15s;
}
.wb-action:hover {
  border-color: var(--border-strong);
}

.wb-canvas-wrap {
  position: relative;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--border-default);
  background: #090b14;
  box-shadow: var(--shadow-md);
}
[data-theme="light"] .wb-canvas-wrap {
  background: #fff;
}
#cBoard {
  width: 100%;
  height: auto;
  display: block;
  touch-action: none;
  cursor: crosshair;
}
.wb-hint {
  position: absolute;
  bottom: 10px;
  right: 14px;
  font-size: 0.75rem;
  color: var(--text-muted);
  pointer-events: none;
  opacity: 0.7;
}

/* Slides & Vocab */
.cslide {
  padding: var(--space-6);
  border-radius: var(--r-lg);
}
.cslide__badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--r-full);
  background: rgba(124, 92, 255, 0.2);
  color: #c4b5fd;
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: var(--space-3);
}
.cslide h3 {
  font-size: 1.35rem;
  margin-bottom: var(--space-2);
}
.cslide__text {
  color: var(--text-secondary);
  margin-bottom: var(--space-4);
}
.cslide__example {
  padding: 12px 16px;
  border-radius: var(--r-sm);
  background: var(--bg-surface);
  border-left: 3px solid var(--accent-secondary);
  margin-bottom: var(--space-5);
  font-size: 0.95rem;
}
.cslide__quiz {
  border-top: 1px solid var(--border-subtle);
  padding-top: var(--space-4);
}
.quiz-q {
  margin-bottom: var(--space-3);
  font-size: 1.05rem;
}
.quiz-options {
  display: grid;
  gap: 8px;
}
.q-opt {
  padding: 12px 16px;
  min-height: 44px;
  text-align: left;
  border-radius: var(--r-sm);
  border: 1px solid var(--border-default);
  background: var(--bg-card);
  cursor: pointer;
  font-size: 0.92rem;
  transition: all 0.2s var(--ease-spring);
}
.q-opt:hover {
  border-color: var(--accent-secondary);
}
.q-opt.selected-correct {
  border-color: var(--color-success);
  background: rgba(16, 185, 129, 0.16);
}
.q-opt.selected-wrong {
  border-color: var(--color-danger);
  background: rgba(239, 68, 68, 0.16);
}
.quiz-feedback {
  margin-top: 10px;
  font-size: 0.92rem;
  font-weight: 600;
}

.cvocab {
  padding: var(--space-6);
  border-radius: var(--r-lg);
}
.cvocab h3 {
  margin-bottom: var(--space-4);
  font-size: 1.3rem;
}
.vocab-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-3);
}
.vcard {
  padding: var(--space-4);
  border-radius: var(--r-sm);
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
}
.vcard b {
  font-size: 1.1rem;
  display: block;
}
.vcard small {
  color: var(--accent-secondary);
  display: block;
  margin-bottom: 6px;
  font-weight: 500;
}
.vcard p {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

/* Bottom Dock */
.cdock {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  border-radius: var(--r-lg);
  margin-top: auto;
}
.cdock-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 8px 16px;
  min-height: 52px;
  border-radius: var(--r-sm);
  border: 1px solid var(--border-default);
  background: var(--bg-card);
  color: var(--text-primary);
  cursor: pointer;
  min-width: 68px;
  transition: all 0.2s var(--ease-spring);
}
.cdock-btn:hover {
  transform: translateY(-2px);
  border-color: var(--accent-secondary);
}
.cdock-btn:active {
  transform: scale(0.95);
}
.cdock-btn.off {
  background: rgba(239, 68, 68, 0.18);
  border-color: var(--color-danger);
}
.cdock-btn.active-screen {
  background: rgba(34, 211, 166, 0.2);
  border-color: var(--accent-secondary);
}
.cdock-btn.active-hand {
  background: rgba(245, 158, 11, 0.25);
  border-color: var(--color-warning);
}
.cdock-btn--danger {
  background: var(--color-danger);
  color: #fff;
  border-color: var(--color-danger);
}
.cdock-btn--danger:hover {
  background: #dc2626;
}
.cdock-ic {
  font-size: 1.25rem;
}
.cdock-label {
  font-size: 0.72rem;
  font-weight: 600;
}
.cdock-sep {
  width: 1px;
  height: 32px;
  background: var(--border-default);
  margin: 0 4px;
}

/* Sidebar */
.csidebar {
  display: flex;
  flex-direction: column;
  border-radius: var(--r-lg);
  overflow: hidden;
  height: calc(100vh - 100px);
  position: sticky;
  top: 84px;
}
.csidebar.collapsed {
  display: none;
}
.cside-tabs {
  display: flex;
  border-bottom: 1px solid var(--border-default);
  background: var(--bg-surface);
}
.cside-tab {
  flex: 1;
  padding: 12px 8px;
  min-height: 44px;
  border: 0;
  background: none;
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--text-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all 0.2s var(--ease-smooth);
}
.cside-tab:hover {
  color: var(--text-primary);
}
.cside-tab.active {
  color: var(--accent-secondary);
  border-bottom-color: var(--accent-secondary);
  background: rgba(34, 211, 166, 0.06);
}
.cside-view {
  display: none;
  flex-direction: column;
  flex: 1;
  overflow-y: auto;
  padding: var(--space-4);
}
.cside-view.active {
  display: flex;
}

.cchat-messages {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-right: 4px;
  min-height: 260px;
  max-height: 460px;
}
.cmsg {
  display: flex;
  flex-direction: column;
  gap: 3px;
  max-width: 88%;
}
.cmsg--tutor { align-self: flex-start; }
.cmsg--me { align-self: flex-end; }
.cmsg__sender {
  font-size: 0.72rem;
  color: var(--text-muted);
}
.cmsg__bubble {
  padding: 9px 13px;
  border-radius: var(--r-md);
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  font-size: 0.88rem;
  line-height: 1.45;
}
.cmsg--me .cmsg__bubble {
  background: rgba(124, 92, 255, 0.25);
  border-color: rgba(124, 92, 255, 0.4);
}
.cmsg__time {
  font-size: 0.68rem;
  color: var(--text-muted);
  align-self: flex-end;
}
.cquick-chips {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin: 10px 0;
}
.chip-btn {
  font-size: 0.78rem;
  padding: 6px 12px;
  min-height: 32px;
  border-radius: var(--r-full);
  border: 1px solid var(--border-default);
  background: var(--bg-card);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s;
}
.chip-btn:hover {
  border-color: var(--accent-secondary);
  color: var(--accent-secondary);
}
.cchat-form {
  display: flex;
  gap: 6px;
}
.cchat-form input {
  flex: 1;
  padding: 10px 14px;
  min-height: 44px;
  border-radius: var(--r-sm);
  border: 1.5px solid var(--border-default);
  background: var(--bg-surface);
  outline: 0;
  font-size: 0.9rem;
  color: var(--text-primary);
}
.cchat-form input:focus {
  border-color: var(--accent-secondary);
}

.cplan-wrap {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}
.cplan-progress {
  padding: var(--space-4);
  border-radius: var(--r-md);
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
  align-items: center;
}
.cplan-progress span {
  font-size: 0.85rem;
  color: var(--text-muted);
}
.cplan-progress b {
  font-size: 1.15rem;
  color: var(--accent-secondary);
}
.plan-bar {
  grid-column: 1 / -1;
  height: 6px;
  border-radius: var(--r-full);
  background: var(--border-default);
  overflow: hidden;
}
.plan-bar-fill {
  height: 100%;
  background: var(--grad);
  transition: width 0.3s var(--ease-smooth);
}
.cplan-tasks {
  display: grid;
  gap: 10px;
}
.cplan-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px 14px;
  min-height: 44px;
  border-radius: var(--r-sm);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  font-size: 0.88rem;
  cursor: pointer;
  transition: all 0.2s;
}
.cplan-item.done {
  opacity: 0.65;
  text-decoration: line-through;
}
.cplan-item input {
  margin-top: 3px;
  accent-color: var(--accent-secondary);
  width: 16px;
  height: 16px;
}

.cnotes-wrap {
  display: flex;
  flex-direction: column;
  gap: 12px;
  height: 100%;
}
.cnotes-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.cnotes-head span {
  font-size: 0.9rem;
  font-weight: 600;
}
.saved-badge {
  color: var(--accent-secondary);
  font-size: 0.78rem;
  font-weight: 600;
}
.cnotes-text {
  flex: 1;
  min-height: 300px;
  padding: 12px;
  border-radius: var(--r-md);
  border: 1.5px solid var(--border-default);
  background: var(--bg-surface);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.9rem;
  line-height: 1.5;
  outline: 0;
  resize: none;
}
.cnotes-text:focus {
  border-color: var(--accent-secondary);
}

/* ==========================================================================
   RESPONSIVE BREAKPOINTS (Mobile First Polish)
   ========================================================================== */
@media (max-width: 1100px) {
  .slayout { grid-template-columns: 1fr; }
  .sside { display: none; }
  .pcard { grid-template-columns: 130px 1fr; }
  .buy { grid-column: 1 / -1; }
  .photo { width: 130px; height: 130px; }
  .fbox.search { min-width: 100%; }

  .cworkspace { grid-template-columns: 1fr; }
  .csidebar { height: auto; position: static; }
}

@media (max-width: 900px) {
  .hero, .two, .cshowcase { grid-template-columns: 1fr; }
  .hero__visual { height: 340px; }
  .hero__circle { width: 220px; height: 220px; }
  .hero__big { font-size: 5rem; }
  .nav__links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-surface);
    padding: var(--space-5);
    border-bottom: 1px solid var(--border-default);
    box-shadow: var(--shadow-lg);
  }
  .nav__links.open { display: flex; }
  .burger { display: grid; }
  .stats { gap: var(--space-4); }
  .cshowcase { padding: var(--space-6); }
}

@media (max-width: 650px) {
  .pcard { grid-template-columns: 1fr; }
  .photo { width: 100%; height: 160px; }
  .cvideo-grid { grid-template-columns: 1fr; }
  .cnav__info { display: none; }
  .cdock { flex-wrap: wrap; }
  .hero { padding-block: var(--space-8); }
}

/* ==========================================================================
   TELEGRAM AUTHENTICATION & USER PROFILE STYLES
   ========================================================================== */
.btn--tg {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  background: linear-gradient(135deg, #24A1DE 0%, #0088cc 100%);
  color: #ffffff !important;
  font-weight: 600;
  padding: 10px 18px;
  border-radius: var(--r-md);
  box-shadow: 0 4px 14px rgba(36, 161, 222, 0.35);
  transition: transform 0.2s var(--ease-spring), box-shadow 0.2s;
  text-decoration: none;
  cursor: pointer;
  width: 100%;
  margin-top: var(--space-2);
}
.btn--tg:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(36, 161, 222, 0.5);
}

.tg-auth-modal {
  text-align: center;
}
.tg-icon-badge {
  width: 60px;
  height: 60px;
  margin: 0 auto var(--space-3);
  background: linear-gradient(135deg, #24A1DE 0%, #0088cc 100%);
  border-radius: var(--r-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  box-shadow: 0 8px 24px rgba(36, 161, 222, 0.4);
  animation: pulse-glow 2.5s infinite;
}
@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 8px 24px rgba(36, 161, 222, 0.4); }
  50% { box-shadow: 0 8px 36px rgba(36, 161, 222, 0.7); }
}

.tg-steps {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  margin: var(--space-5) 0;
  text-align: left;
}
.tg-step {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--r-md);
}
.tg-num {
  width: 28px;
  height: 28px;
  background: var(--grad);
  border-radius: var(--r-full);
  color: #fff;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  flex-shrink: 0;
}
.tg-step b {
  display: block;
  font-size: 15px;
  margin-bottom: 4px;
}
.tg-step p {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.4;
  margin-bottom: 6px;
}
.tg-step code {
  background: rgba(124, 92, 255, 0.15);
  color: var(--accent-primary);
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 600;
}

.otp-inputs {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin: var(--space-3) 0;
}
.otp-box {
  width: 44px;
  height: 52px;
  text-align: center;
  font-size: 24px;
  font-weight: 700;
  font-family: Outfit, monospace;
  background: var(--bg-surface);
  border: 2px solid var(--border-default);
  border-radius: var(--r-sm);
  color: var(--text-primary);
  transition: all 0.2s var(--ease-spring);
}
.otp-box:focus {
  border-color: var(--accent-secondary);
  box-shadow: 0 0 12px rgba(34, 211, 166, 0.4);
  transform: translateY(-2px);
  outline: none;
}
.otp-box.filled {
  border-color: var(--accent-primary);
}
.otp-status {
  font-size: 13px;
  text-align: center;
  min-height: 20px;
}
.otp-status.error {
  color: var(--color-danger);
}
.otp-status.success {
  color: var(--color-success);
  font-weight: 600;
}

.tg-actions {
  margin-top: var(--space-4);
}
.tg-actions .btn {
  width: 100%;
}
.tg-footer-note {
  margin-top: var(--space-3);
  color: var(--text-muted);
}

/* User Menu in Navbar */
.user-menu-wrap {
  position: relative;
}
.user-chip-btn {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 4px 10px 4px 4px;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--r-full);
  cursor: pointer;
  transition: all 0.2s var(--ease-smooth);
}
.user-chip-btn:hover {
  border-color: var(--accent-secondary);
  background: var(--bg-surface-glass);
}
.user-avatar-small {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, #7c5cff, #22d3a6);
  border-radius: var(--r-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 14px;
}
.user-name-text {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  max-width: 100px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.chevron-down {
  font-size: 11px;
  color: var(--text-muted);
}
.user-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 210px;
  padding: 8px;
  border-radius: var(--r-md);
  border: 1px solid var(--border-default);
  background: var(--bg-surface);
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  animation: dropdown-fade 0.2s var(--ease-spring);
}
@keyframes dropdown-fade {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}
.dropdown-header {
  padding: 8px 10px;
}
.dropdown-header b {
  display: block;
  font-size: 14px;
  color: var(--text-primary);
}
.dropdown-header small {
  color: var(--accent-secondary);
  font-weight: 500;
}
.dropdown-divider {
  height: 1px;
  background: var(--border-subtle);
  margin: 6px 0;
}
.dropdown-item {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 8px 10px;
  font-size: 13px;
  border-radius: var(--r-xs);
  color: var(--text-secondary);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  text-decoration: none;
}
.dropdown-item:hover {
  background: var(--bg-surface-elevated);
  color: var(--text-primary);
}
.dropdown-item.danger {
  color: var(--color-danger);
}
.dropdown-item.danger:hover {
  background: rgba(239, 68, 68, 0.12);
}