/* =====================================================================
   TrueVacancy Coding & AI Academy — Premium Glassmorphism Stylesheet
    Multi-Section Master Teacher Design • Zero External Dependencies
   ===================================================================== */

:root {
  --bg-deep: #060916;
  --bg-mid: #0e132b;
  --bg-teal: #081c29;
  --glass-bg: rgba(17, 25, 48, 0.68);
  --glass-bg-strong: rgba(15, 23, 42, 0.86);
  --glass-card: rgba(30, 41, 72, 0.48);
  --glass-hover: rgba(51, 65, 108, 0.58);
  --glass-border: rgba(148, 163, 214, 0.20);
  --glass-border-bright: rgba(125, 211, 252, 0.42);
  --glass-shadow: 0 14px 40px rgba(2, 6, 23, 0.55);

  --text-main: #f8fafc;
  --text-soft: #cbd5e1;
  --text-muted: #94a3b8;

  --accent-cyan: #38bdf8;
  --accent-indigo: #6366f1;
  --accent-purple: #a855f7;
  --accent-emerald: #22c55e;
  --accent-amber: #fbbf24;
  --accent-rose: #f43f5e;

  --track-html: #fb923c;
  --track-python: #38bdf8;
  --track-csharp: #c084fc;
  --track-ml: #34d399;

  --radius-xl: 22px;
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;

  --font-sans: 'Segoe UI', system-ui, -apple-system, Roboto, 'Noto Sans Devanagari', 'Mangal', sans-serif;
  --font-mono: 'Cascadia Code', 'Consolas', 'JetBrains Mono', 'Courier New', monospace;
}

*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  color: var(--text-main);
  background: radial-gradient(circle at 12% 15%, #191c47 0%, transparent 45%),
              radial-gradient(circle at 88% 18%, #0c3547 0%, transparent 42%),
              radial-gradient(circle at 50% 88%, #1e123d 0%, transparent 50%),
              linear-gradient(145deg, var(--bg-deep) 0%, var(--bg-mid) 52%, var(--bg-teal) 100%);
  background-attachment: fixed;
  line-height: 1.6;
  overflow-x: hidden;
}

/* Floating Ambient Glassmorphism Orbs */
.tv-ambient-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.tv-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(85px);
  opacity: 0.34;
  animation: tvFloatOrb 18s ease-in-out infinite alternate;
}

.tv-orb-1 {
  width: 380px;
  height: 380px;
  background: #4f46e5;
  top: -90px;
  left: -80px;
}

.tv-orb-2 {
  width: 340px;
  height: 340px;
  background: #0ea5e9;
  top: 28%;
  right: -90px;
  animation-delay: -5s;
}

.tv-orb-3 {
  width: 320px;
  height: 320px;
  background: #10b981;
  bottom: -100px;
  left: 28%;
  opacity: 0.22;
  animation-delay: -10s;
}

@keyframes tvFloatOrb {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(28px, 24px) scale(1.08); }
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: rgba(15, 23, 42, 0.5);
}
::-webkit-scrollbar-thumb {
  background: rgba(100, 116, 139, 0.55);
  border-radius: 99px;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(56, 189, 248, 0.7);
}

/* =====================================================================
   TOP GLASS NAVIGATION HEADER
   ===================================================================== */
.tv-topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(20px) saturate(170%);
  -webkit-backdrop-filter: blur(20px) saturate(170%);
  background: rgba(9, 14, 30, 0.82);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: 0 8px 30px rgba(2, 6, 23, 0.45);
}

.tv-topbar-inner {
  max-width: 1440px;
  margin: 0 auto;
  padding: 10px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
}

.tv-brand {
  display: flex;
  align-items: center;
  gap: 11px;
  cursor: pointer;
  user-select: none;
  text-decoration: none;
  color: inherit;
}

.tv-brand-logo {
  width: 42px;
  height: 42px;
  border-radius: 13px;
  background: linear-gradient(135deg, #6366f1 0%, #0ea5e9 55%, #22c55e 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  box-shadow: 0 6px 18px rgba(56, 189, 248, 0.35);
  flex-shrink: 0;
}

.tv-brand-title {
  font-weight: 800;
  font-size: 16.5px;
  letter-spacing: -0.2px;
  background: linear-gradient(90deg, #ffffff 0%, #bae6fd 60%, #fde68a 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1.2;
}

.tv-brand-sub {
  font-size: 11.5px;
  color: var(--text-muted);
  font-weight: 600;
}

/* Section Navigation Tabs */
.tv-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  background: rgba(15, 23, 42, 0.65);
  border: 1px solid var(--glass-border);
  padding: 4px;
  border-radius: 14px;
  flex-wrap: wrap;
}

.tv-nav-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-soft);
  font-family: inherit;
  font-size: 13px;
  font-weight: 700;
  padding: 7px 13px;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}

.tv-nav-btn:hover {
  color: #fff;
  background: rgba(56, 189, 248, 0.10);
}

.tv-nav-btn.active {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.88), rgba(14, 165, 233, 0.88));
  color: #ffffff;
  border-color: rgba(186, 230, 253, 0.45);
  box-shadow: 0 4px 14px rgba(14, 165, 233, 0.32);
}

/* Right Controls: Country, Lang Mode, Progress Pill */
.tv-top-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.tv-country-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: rgba(30, 41, 75, 0.72);
  border: 1px solid rgba(251, 191, 36, 0.42);
  color: #fef3c7;
  padding: 6px 12px;
  border-radius: 99px;
  font-family: inherit;
  font-size: 12.5px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s ease;
}

.tv-country-btn:hover {
  background: rgba(51, 65, 108, 0.85);
  transform: translateY(-1px);
}

.tv-flag-svg {
  width: 20px;
  height: 14px;
  border-radius: 3px;
  overflow: hidden;
  display: inline-flex;
  flex-shrink: 0;
  box-shadow: 0 0 0 1px rgba(255,255,255,0.25);
}

.tv-lang-group {
  display: inline-flex;
  background: rgba(15, 23, 42, 0.75);
  border: 1px solid var(--glass-border);
  border-radius: 99px;
  padding: 2px;
}

.tv-lang-pill {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-family: inherit;
  font-size: 11.5px;
  font-weight: 700;
  padding: 5px 10px;
  border-radius: 99px;
  cursor: pointer;
  transition: all 0.18s ease;
}

.tv-lang-pill.active {
  background: rgba(56, 189, 248, 0.24);
  color: #e0f2fe;
  box-shadow: inset 0 0 0 1px rgba(56, 189, 248, 0.45);
}

.tv-progress-chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: rgba(20, 83, 45, 0.45);
  border: 1px solid rgba(74, 222, 128, 0.38);
  color: #bbf7d0;
  padding: 6px 12px;
  border-radius: 99px;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
}

/* =====================================================================
   MAIN APP CONTAINER & MULTI-SECTION VIEWS
   ===================================================================== */
.tv-app-shell {
  position: relative;
  z-index: 1;
  max-width: 1440px;
  margin: 0 auto;
  padding: 22px 20px 64px;
}

.tv-section {
  display: none;
  animation: tvFadeIn 0.28s ease;
}

.tv-section.active {
  display: block;
}

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

/* Glass Card Utility */
.tv-glass {
  backdrop-filter: blur(18px) saturate(165%);
  -webkit-backdrop-filter: blur(18px) saturate(165%);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--glass-shadow);
}

/* Bilingual Text Styling (used by TV.renderBilingual & TV.fmtText) */
.tv-code {
  font-family: var(--font-mono);
  font-size: 0.91em;
  background: rgba(15, 23, 42, 0.82);
  color: #7dd3fc;
  border: 1px solid rgba(125, 211, 252, 0.28);
  padding: 1px 6px;
  border-radius: 6px;
  word-break: break-word;
}

.tv-bi-en {
  color: #f1f5f9;
  font-size: 14.5px;
  line-height: 1.65;
}

.tv-bi-hi {
  margin-top: 8px;
  padding: 9px 12px;
  background: rgba(251, 191, 36, 0.08);
  border-left: 3px solid #fbbf24;
  border-radius: 0 10px 10px 0;
  color: #fef3c7;
  font-size: 14.5px;
  line-height: 1.72;
}

.tv-hi-badge {
  display: inline-block;
  background: rgba(251, 191, 36, 0.22);
  color: #fde68a;
  border: 1px solid rgba(251, 191, 36, 0.45);
  font-size: 10.5px;
  font-weight: 800;
  padding: 1px 6px;
  border-radius: 5px;
  margin-right: 5px;
  vertical-align: middle;
}

.tv-hi-inline {
  color: #fde68a;
  font-weight: 600;
}

/* =====================================================================
   SECTION 1: HOME & ACADEMY ROADMAP
   ===================================================================== */
.tv-hero-card {
  padding: 28px 30px;
  display: grid;
  grid-template-columns: 1.55fr 1fr;
  gap: 24px;
  align-items: center;
  background: linear-gradient(135deg, rgba(30, 27, 75, 0.78) 0%, rgba(15, 23, 42, 0.85) 55%, rgba(8, 47, 73, 0.78) 100%);
  border: 1px solid rgba(125, 211, 252, 0.30);
  margin-bottom: 24px;
}

.tv-hero-badge-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.tv-pill-gold {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: 99px;
  font-size: 12px;
  font-weight: 800;
  background: rgba(251, 191, 36, 0.16);
  border: 1px solid rgba(251, 191, 36, 0.45);
  color: #fde68a;
}

.tv-pill-cyan {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: 99px;
  font-size: 12px;
  font-weight: 700;
  background: rgba(56, 189, 248, 0.15);
  border: 1px solid rgba(56, 189, 248, 0.4);
  color: #bae6fd;
}

.tv-hero-h1 {
  margin: 0 0 10px;
  font-size: clamp(24px, 3vw, 35px);
  font-weight: 900;
  line-height: 1.22;
  color: #ffffff;
}

.tv-hero-h1 span {
  background: linear-gradient(90deg, #38bdf8, #a855f7, #fbbf24);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.tv-hero-sub {
  margin: 0 0 18px;
  color: var(--text-soft);
  font-size: 15px;
  max-width: 680px;
}

.tv-hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.tv-btn-primary {
  background: linear-gradient(135deg, #4f46e5 0%, #0ea5e9 100%);
  color: #fff;
  border: 1px solid rgba(186, 230, 253, 0.45);
  padding: 11px 22px;
  border-radius: 12px;
  font-family: inherit;
  font-size: 14.5px;
  font-weight: 800;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 8px 24px rgba(14, 165, 233, 0.35);
  transition: all 0.2s ease;
}

.tv-btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(14, 165, 233, 0.48);
}

.tv-btn-secondary {
  background: rgba(30, 41, 72, 0.72);
  color: #e2e8f0;
  border: 1px solid var(--glass-border-bright);
  padding: 11px 18px;
  border-radius: 12px;
  font-family: inherit;
  font-size: 13.5px;
  font-weight: 700;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  transition: all 0.2s ease;
}

.tv-btn-secondary:hover {
  background: rgba(51, 65, 108, 0.85);
  color: #fff;
}

/* 3-Step Method Box inside Hero */
.tv-method-box {
  background: rgba(9, 14, 30, 0.65);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 18px;
}

.tv-method-title {
  font-size: 13px;
  font-weight: 800;
  color: #fde68a;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 12px;
}

.tv-method-step {
  display: flex;
  gap: 11px;
  align-items: flex-start;
  padding: 8px 0;
  border-bottom: 1px dashed rgba(148, 163, 184, 0.16);
}

.tv-method-step:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.tv-method-num {
  width: 26px;
  height: 26px;
  border-radius: 8px;
  background: linear-gradient(135deg, #6366f1, #38bdf8);
  color: #fff;
  font-weight: 800;
  font-size: 13px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

/* 4 Course Roadmap Grid */
.tv-section-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin: 8px 0 16px;
}

.tv-section-heading h2 {
  margin: 0;
  font-size: 21px;
  font-weight: 800;
}

.tv-courses-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.tv-course-card {
  padding: 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 14px;
  transition: transform 0.22s ease, border-color 0.22s ease;
  position: relative;
  overflow: hidden;
}

.tv-course-card:hover {
  transform: translateY(-3px);
  border-color: var(--glass-border-bright);
}

.tv-course-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.tv-course-icon {
  width: 50px;
  height: 50px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  flex-shrink: 0;
}

.tv-course-chapters-list {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.tv-chap-pill {
  background: rgba(15, 23, 42, 0.72);
  border: 1px solid var(--glass-border);
  color: var(--text-soft);
  padding: 5px 10px;
  border-radius: 9px;
  font-family: inherit;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.16s ease;
  text-align: left;
}

.tv-chap-pill:hover {
  border-color: var(--accent-cyan);
  color: #fff;
  background: rgba(56, 189, 248, 0.16);
}

.tv-chap-pill.done {
  border-color: rgba(34, 197, 94, 0.55);
  background: rgba(20, 83, 45, 0.35);
  color: #bbf7d0;
}

.tv-bar-track {
  height: 8px;
  background: rgba(15, 23, 42, 0.8);
  border-radius: 99px;
  overflow: hidden;
}

.tv-bar-fill {
  height: 100%;
  border-radius: 99px;
  background: linear-gradient(90deg, #38bdf8, #22c55e);
  transition: width 0.4s ease;
}

/* =====================================================================
   SECTION 2: INTERACTIVE CLASSROOM (MASTER TEACHER + LIVE LAB)
   ===================================================================== */
.tv-track-switcher {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-bottom: 18px;
}

.tv-track-tab {
  background: rgba(17, 25, 48, 0.72);
  border: 1px solid var(--glass-border);
  border-radius: 14px;
  padding: 11px 14px;
  color: var(--text-soft);
  font-family: inherit;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  transition: all 0.2s ease;
  text-align: left;
}

.tv-track-tab:hover {
  background: var(--glass-hover);
  color: #fff;
}

.tv-track-tab.active {
  background: linear-gradient(135deg, rgba(49, 46, 129, 0.85), rgba(14, 116, 144, 0.75));
  border-color: #38bdf8;
  color: #ffffff;
  box-shadow: 0 6px 20px rgba(14, 165, 233, 0.28);
}

.tv-classroom-layout {
  display: grid;
  grid-template-columns: 270px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}

/* Left Chapter Sidebar */
.tv-chapter-sidebar {
  padding: 16px;
  position: sticky;
  top: 78px;
  max-height: calc(100vh - 96px);
  overflow-y: auto;
}

.tv-sidebar-title {
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--accent-cyan);
  margin-bottom: 10px;
  padding: 0 4px;
}

.tv-sidebar-item {
  width: 100%;
  background: rgba(15, 23, 42, 0.55);
  border: 1px solid transparent;
  color: var(--text-soft);
  border-radius: 11px;
  padding: 10px 11px;
  margin-bottom: 7px;
  font-family: inherit;
  text-align: left;
  cursor: pointer;
  display: flex;
  align-items: flex-start;
  gap: 9px;
  transition: all 0.16s ease;
}

.tv-sidebar-item:hover {
  background: rgba(51, 65, 108, 0.52);
  color: #fff;
}

.tv-sidebar-item.active {
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.42), rgba(14, 165, 233, 0.32));
  border-color: rgba(125, 211, 252, 0.6);
  color: #ffffff;
}

.tv-sidebar-num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 800;
  padding: 2px 6px;
  border-radius: 6px;
  background: rgba(15, 23, 42, 0.85);
  color: #7dd3fc;
  flex-shrink: 0;
}

.tv-sidebar-item.done .tv-sidebar-num {
  background: rgba(22, 163, 74, 0.32);
  color: #86efac;
}

.tv-sidebar-name {
  font-size: 12.8px;
  font-weight: 600;
  line-height: 1.35;
}

/* Main Lesson Column */
.tv-lesson-main {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.tv-lesson-header {
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  background: linear-gradient(135deg, rgba(30, 41, 82, 0.78), rgba(15, 23, 42, 0.85));
}

.tv-chap-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 800;
  color: #7dd3fc;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
}

.tv-chap-title {
  margin: 0;
  font-size: clamp(20px, 2.3vw, 26px);
  font-weight: 900;
  color: #ffffff;
}

.tv-chap-title-hi {
  font-size: 15px;
  color: #fde68a;
  font-weight: 700;
  margin-top: 3px;
}

/* Teacher Story Card */
.tv-teacher-card {
  padding: 20px 24px;
}

.tv-block-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 800;
  color: #bae6fd;
  background: rgba(14, 165, 233, 0.14);
  border: 1px solid rgba(56, 189, 248, 0.32);
  padding: 4px 12px;
  border-radius: 99px;
  margin-bottom: 12px;
}

/* Breakdown Grid (Har Ek Shabd & Symbol Ka Matlab) */
.tv-breakdown-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(265px, 1fr));
  gap: 12px;
}

.tv-token-card {
  background: rgba(9, 14, 30, 0.66);
  border: 1px solid var(--glass-border);
  border-radius: 13px;
  padding: 13px 14px;
  transition: border-color 0.18s ease;
}

.tv-token-card:hover {
  border-color: rgba(125, 211, 252, 0.5);
}

.tv-token-head {
  font-family: var(--font-mono);
  font-size: 13.5px;
  font-weight: 800;
  color: #38bdf8;
  background: rgba(14, 165, 233, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.25);
  display: inline-block;
  padding: 3px 9px;
  border-radius: 7px;
  margin-bottom: 8px;
  word-break: break-all;
}

/* Bana-Banaya Ready Example + Line Notes */
.tv-example-grid {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 16px;
  align-items: stretch;
}

.tv-ready-code-box {
  background: #070b17;
  border: 1px solid rgba(99, 102, 241, 0.38);
  border-radius: 14px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.tv-code-box-bar {
  background: rgba(30, 41, 72, 0.72);
  padding: 9px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--glass-border);
  font-size: 12px;
  font-weight: 700;
  color: #cbd5e1;
}

.tv-ready-pre {
  margin: 0;
  padding: 14px 16px;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.65;
  color: #e2e8f0;
  overflow-x: auto;
  white-space: pre;
  flex: 1;
}

.tv-ready-actions {
  padding: 10px 14px;
  background: rgba(15, 23, 42, 0.85);
  border-top: 1px solid var(--glass-border);
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.tv-line-notes {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.tv-line-note-item {
  background: rgba(9, 14, 30, 0.62);
  border: 1px solid var(--glass-border);
  border-radius: 11px;
  padding: 10px 13px;
}

.tv-line-note-code {
  font-family: var(--font-mono);
  font-size: 12.2px;
  color: #a5b4fc;
  background: rgba(30, 27, 75, 0.65);
  padding: 3px 8px;
  border-radius: 6px;
  display: inline-block;
  margin-bottom: 5px;
  word-break: break-all;
}

/* =====================================================================
   PART 4: 3-MODE INTERACTIVE LIVE CODING & PREVIEW LAB
   ===================================================================== */
.tv-lab-shell {
  padding: 20px 22px;
  border: 1px solid rgba(56, 189, 248, 0.35);
}

.tv-lab-modes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 16px;
}

.tv-mode-tab {
  background: rgba(15, 23, 42, 0.72);
  border: 1px solid var(--glass-border);
  border-radius: 13px;
  padding: 11px 14px;
  color: var(--text-soft);
  font-family: inherit;
  cursor: pointer;
  text-align: left;
  transition: all 0.18s ease;
}

.tv-mode-tab:hover {
  background: var(--glass-hover);
  color: #fff;
}

.tv-mode-tab.active {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.26), rgba(14, 165, 233, 0.30));
  border-color: #34d399;
  color: #ffffff;
  box-shadow: 0 4px 16px rgba(16, 185, 129, 0.22);
}

.tv-mode-tab-title {
  font-size: 13.5px;
  font-weight: 800;
  display: block;
}

.tv-mode-tab-sub {
  font-size: 11.5px;
  color: var(--text-muted);
  display: block;
  margin-top: 2px;
}

.tv-mode-tab.active .tv-mode-tab-sub {
  color: #d1fae5;
}

/* Mode Banner / Guided Reference / Challenge Checklist */
.tv-mode-banner {
  background: rgba(9, 14, 30, 0.74);
  border: 1px solid var(--glass-border);
  border-radius: 14px;
  padding: 14px 16px;
  margin-bottom: 16px;
}

.tv-pinned-ref {
  margin-top: 10px;
  background: #050811;
  border: 1px dashed rgba(56, 189, 248, 0.45);
  border-radius: 10px;
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 12.8px;
  line-height: 1.6;
  color: #bae6fd;
  white-space: pre-wrap;
  max-height: 175px;
  overflow-y: auto;
}

.tv-task-steps {
  margin: 10px 0 0;
  padding-left: 20px;
  color: #e2e8f0;
  font-size: 13.5px;
}

.tv-task-steps li {
  margin-bottom: 5px;
}

/* Split Screen Lab Grid */
.tv-lab-split {
  display: grid;
  grid-template-columns: 1fr 1.05fr;
  gap: 16px;
  align-items: stretch;
}

/* Editor Pane */
.tv-editor-card {
  background: #060913;
  border: 1px solid rgba(148, 163, 184, 0.28);
  border-radius: 15px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.tv-editor-topbar {
  background: rgba(30, 41, 72, 0.78);
  padding: 9px 13px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--glass-border);
}

.tv-file-pill {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: #7dd3fc;
  background: rgba(15, 23, 42, 0.8);
  padding: 4px 10px;
  border-radius: 7px;
  border: 1px solid rgba(56, 189, 248, 0.28);
}

/* Quick Symbol Insert Strip */
.tv-symbol-bar {
  display: flex;
  align-items: center;
  gap: 5px;
  flex-wrap: wrap;
  padding: 7px 11px;
  background: rgba(15, 23, 42, 0.9);
  border-bottom: 1px solid rgba(148, 163, 184, 0.16);
}

.tv-symbol-bar-label {
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 700;
  margin-right: 3px;
}

.tv-sym-chip {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  background: rgba(30, 41, 72, 0.85);
  color: #e0f2fe;
  border: 1px solid rgba(125, 211, 252, 0.28);
  border-radius: 6px;
  padding: 3px 8px;
  cursor: pointer;
  transition: all 0.14s ease;
}

.tv-sym-chip:hover {
  background: rgba(56, 189, 248, 0.28);
  border-color: #38bdf8;
}

/* Editor Body with Line Numbers */
.tv-editor-body {
  display: flex;
  flex: 1;
  min-height: 270px;
  position: relative;
}

.tv-line-nums {
  width: 42px;
  padding: 14px 8px;
  text-align: right;
  font-family: var(--font-mono);
  font-size: 13.8px;
  line-height: 1.62;
  white-space: pre;
  color: #64748b;
  background: #040711;
  border-right: 1px solid rgba(148, 163, 184, 0.14);
  user-select: none;
  overflow: hidden;
  flex-shrink: 0;
}

.tv-code-textarea {
  flex: 1;
  width: 100%;
  border: none;
  outline: none;
  resize: vertical;
  min-height: 270px;
  padding: 14px 14px;
  background: #070b18;
  color: #f8fafc;
  font-family: var(--font-mono);
  font-size: 13.8px;
  line-height: 1.62;
  tab-size: 4;
  white-space: pre;
  overflow: auto;
}

.tv-editor-footer {
  padding: 10px 13px;
  background: rgba(15, 23, 42, 0.92);
  border-top: 1px solid var(--glass-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  flex-wrap: wrap;
}

.tv-btn-run {
  background: linear-gradient(135deg, #16a34a 0%, #059669 100%);
  color: #ffffff;
  border: 1px solid rgba(134, 239, 172, 0.55);
  padding: 9px 18px;
  border-radius: 10px;
  font-family: inherit;
  font-size: 13.5px;
  font-weight: 800;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  box-shadow: 0 6px 18px rgba(22, 163, 74, 0.35);
  transition: all 0.16s ease;
}

.tv-btn-run:hover {
  transform: translateY(-1px);
  filter: brightness(1.08);
}

.tv-btn-ghost {
  background: rgba(30, 41, 72, 0.65);
  color: #cbd5e1;
  border: 1px solid var(--glass-border);
  padding: 7px 11px;
  border-radius: 8px;
  font-family: inherit;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s ease;
}

.tv-btn-ghost:hover {
  background: rgba(51, 65, 108, 0.85);
  color: #fff;
}

/* Right Preview + Console + Chintu Bot Column */
.tv-output-col {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.tv-preview-card {
  background: rgba(9, 14, 30, 0.82);
  border: 1px solid rgba(125, 211, 252, 0.32);
  border-radius: 15px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.tv-preview-header {
  background: rgba(30, 41, 72, 0.78);
  padding: 9px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--glass-border);
  font-size: 12.5px;
  font-weight: 800;
  color: #bae6fd;
}

.tv-preview-stage {
  min-height: 265px;
  padding: 12px;
  display: flex;
  flex-direction: column;
}

/* Terminal Output Box */
.tv-terminal-card {
  background: #040711;
  border: 1px solid rgba(74, 222, 128, 0.28);
  border-radius: 13px;
  overflow: hidden;
}

.tv-terminal-head {
  background: rgba(15, 23, 42, 0.9);
  padding: 6px 12px;
  font-size: 11.5px;
  font-weight: 800;
  color: #86efac;
  border-bottom: 1px solid rgba(148, 163, 184, 0.15);
  display: flex;
  justify-content: space-between;
}

.tv-terminal-pre {
  margin: 0;
  padding: 11px 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.55;
  color: #4ade80;
  min-height: 58px;
  max-height: 150px;
  overflow-y: auto;
  white-space: pre-wrap;
}

.tv-terminal-pre.is-error {
  color: #fda4af;
}

/* Chintu Bot Friendly Tutor & Task Checklist */
.tv-chintu-card {
  border-radius: 14px;
  padding: 13px 15px;
  background: rgba(30, 41, 72, 0.62);
  border: 1px solid rgba(251, 191, 36, 0.38);
}

.tv-chintu-card.status-pass {
  background: rgba(20, 83, 45, 0.38);
  border-color: rgba(74, 222, 128, 0.55);
}

.tv-chintu-card.status-hint {
  background: rgba(120, 53, 15, 0.36);
  border-color: rgba(251, 191, 36, 0.68);
}

.tv-chintu-title {
  font-size: 13px;
  font-weight: 800;
  color: #fde68a;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.tv-checks-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 8px;
}

.tv-check-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12.8px;
  padding: 6px 10px;
  border-radius: 8px;
  background: rgba(9, 14, 30, 0.55);
}

.tv-check-row.passed {
  color: #bbf7d0;
  border: 1px solid rgba(74, 222, 128, 0.35);
}

.tv-check-row.pending {
  color: #cbd5e1;
  border: 1px solid rgba(148, 163, 184, 0.18);
}

/* =====================================================================
   STYLES FOR js/07-viz.js LIVE VISUALIZERS
   ===================================================================== */
/* 1. HTML Mini Browser */
.tv-mini-browser {
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid rgba(148, 163, 184, 0.32);
  background: #ffffff;
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 255px;
}

.tv-browser-chrome {
  background: #1e293b;
  padding: 7px 12px;
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px solid #334155;
}

.tv-browser-dots {
  display: flex;
  gap: 5px;
}

.tv-browser-dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}

.tv-browser-url {
  background: #0f172a;
  color: #94a3b8;
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 6px;
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tv-browser-iframe {
  width: 100%;
  flex: 1;
  min-height: 225px;
  border: none;
  background: #ffffff;
}

/* 2. Python Visual Memory, Calculator, Flowchart, Loop, Train Bogies */
.tv-viz-scroll {
  display: flex;
  flex-direction: column;
  gap: 11px;
  max-height: 390px;
  overflow-y: auto;
  padding-right: 3px;
}

.tv-viz-empty {
  text-align: center;
  padding: 28px 16px;
  background: rgba(15, 23, 42, 0.6);
  border-radius: 12px;
  border: 1px dashed rgba(251, 191, 36, 0.45);
}

.tv-viz-block {
  background: rgba(15, 23, 42, 0.78);
  border: 1px solid rgba(125, 211, 252, 0.22);
  border-radius: 12px;
  padding: 12px 14px;
}

.tv-viz-heading {
  font-size: 12.5px;
  font-weight: 800;
  color: #7dd3fc;
  margin-bottom: 9px;
}

.tv-dabba-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tv-dabba {
  min-width: 108px;
  background: linear-gradient(145deg, rgba(49, 46, 129, 0.72), rgba(15, 23, 42, 0.92));
  border: 1px solid rgba(129, 140, 248, 0.55);
  border-radius: 12px;
  padding: 8px 12px;
  text-align: center;
  box-shadow: 0 6px 16px rgba(79, 70, 229, 0.24);
}

.tv-dabba-label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 800;
  color: #fde68a;
}

.tv-dabba-val {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 900;
  color: #ffffff;
  margin: 4px 0;
}

.tv-dabba-type {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: #7dd3fc;
  background: rgba(14, 165, 233, 0.16);
  border-radius: 99px;
  padding: 1px 7px;
  display: inline-block;
}

.tv-calc-row {
  display: flex;
  align-items: center;
  gap: 7px;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 12.5px;
  margin-bottom: 6px;
}

.tv-calc-pill {
  background: rgba(30, 41, 72, 0.85);
  border: 1px solid rgba(125, 211, 252, 0.35);
  padding: 4px 9px;
  border-radius: 8px;
  color: #e0f2fe;
}

.tv-calc-op {
  color: #fbbf24;
  font-weight: 900;
}

.tv-calc-res {
  background: rgba(22, 163, 74, 0.28);
  border: 1px solid rgba(74, 222, 128, 0.55);
  color: #bbf7d0;
  font-weight: 800;
  padding: 4px 10px;
  border-radius: 8px;
}

.tv-flow-list {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.tv-flow-node {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 9px;
  font-size: 12.5px;
  font-weight: 700;
}

.tv-flow-green {
  background: rgba(22, 163, 74, 0.28);
  border: 1px solid #4ade80;
  color: #dcfce7;
}

.tv-flow-red {
  background: rgba(185, 28, 28, 0.22);
  border: 1px solid rgba(248, 113, 113, 0.45);
  color: #fecaca;
}

.tv-flow-dim {
  background: rgba(30, 41, 59, 0.55);
  border: 1px solid rgba(148, 163, 184, 0.2);
  color: #94a3b8;
}

.tv-steps-row {
  display: flex;
  gap: 7px;
  flex-wrap: wrap;
}

.tv-step-chip {
  background: rgba(30, 41, 72, 0.78);
  border: 1px solid rgba(56, 189, 248, 0.38);
  border-radius: 9px;
  padding: 6px 10px;
  min-width: 78px;
  text-align: center;
}

.tv-step-num {
  font-size: 10px;
  font-weight: 800;
  color: #7dd3fc;
}

.tv-step-val {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 800;
  color: #fff;
}

.tv-step-out {
  font-size: 10.5px;
  color: #86efac;
  margin-top: 2px;
}

.tv-train-row {
  display: flex;
  align-items: center;
  gap: 4px;
  overflow-x: auto;
  padding-bottom: 4px;
}

.tv-train-engine {
  background: linear-gradient(135deg, #db2777, #9333ea);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 800;
  padding: 10px 12px;
  border-radius: 10px;
  flex-shrink: 0;
}

.tv-train-link {
  color: #94a3b8;
  font-weight: 900;
}

.tv-bogie {
  background: rgba(30, 41, 72, 0.85);
  border: 1px solid rgba(244, 114, 182, 0.38);
  border-radius: 10px;
  padding: 6px 11px;
  text-align: center;
  flex-shrink: 0;
}

.tv-bogie-hit {
  background: rgba(219, 39, 119, 0.35);
  border-color: #f472b6;
  box-shadow: 0 0 14px rgba(244, 114, 182, 0.45);
}

.tv-bogie-idx {
  font-family: var(--font-mono);
  font-size: 10px;
  color: #fbcfe8;
}

.tv-bogie-val {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 800;
  color: #fff;
}

/* 3. C# 2D Game Stage */
.tv-game-stage {
  background: linear-gradient(180deg, #0b132b 0%, #1c2541 68%, #14362b 100%);
  border: 1px solid rgba(192, 132, 252, 0.42);
  border-radius: 13px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 255px;
}

.tv-game-hud {
  display: flex;
  gap: 7px;
  flex-wrap: wrap;
  padding: 9px 12px;
  background: rgba(7, 11, 25, 0.72);
  border-bottom: 1px solid rgba(148, 163, 184, 0.18);
}

.tv-hud-chip {
  font-size: 11.5px;
  background: rgba(30, 41, 72, 0.85);
  border: 1px solid rgba(192, 132, 252, 0.32);
  padding: 3px 9px;
  border-radius: 99px;
  color: #e2e8f0;
}

.tv-game-arena {
  display: flex;
  align-items: center;
  justify-content: space-around;
  gap: 14px;
  padding: 20px 14px;
  min-height: 155px;
}

.tv-hero-wrap {
  text-align: center;
  position: relative;
  transition: transform 0.25s ease;
}

.tv-hero-jump {
  animation: tvHeroJump 0.65s ease;
}

@keyframes tvHeroJump {
  0%, 100% { transform: translateY(0); }
  45% { transform: translateY(-34px) scale(1.06); }
}

.tv-hero-sprite {
  font-size: 48px;
  line-height: 1.1;
}

.tv-speech-bubble {
  background: #ffffff;
  color: #0f172a;
  font-size: 11.5px;
  font-weight: 800;
  padding: 5px 10px;
  border-radius: 10px;
  margin-bottom: 6px;
  max-width: 190px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.tv-hero-slash {
  position: absolute;
  right: -34px;
  top: 38px;
  font-size: 24px;
  opacity: 0;
  pointer-events: none;
}

.tv-slash-active {
  animation: tvSlashAnim 0.6s ease;
}

@keyframes tvSlashAnim {
  0% { opacity: 0; transform: scale(0.5) rotate(-25deg); }
  45% { opacity: 1; transform: scale(1.25) rotate(12deg); }
  100% { opacity: 0; transform: scale(1) translateX(14px); }
}

.tv-boss-box, .tv-dummy-enemy, .tv-enemy-wave {
  text-align: center;
}

.tv-boss-emoji {
  font-size: 52px;
  animation: tvFloatOrb 2s ease-in-out infinite alternate;
}

.tv-boss-badge {
  background: rgba(220, 38, 38, 0.35);
  border: 1px solid #f87171;
  color: #fecaca;
  font-size: 11px;
  font-weight: 800;
  padding: 3px 9px;
  border-radius: 99px;
}

.tv-aliens-row {
  display: flex;
  gap: 5px;
  flex-wrap: wrap;
  justify-content: center;
  max-width: 190px;
}

.tv-alien {
  font-size: 26px;
  display: inline-block;
  animation: tvHeroJump 1.1s ease-in-out infinite;
}

.tv-wave-label {
  font-size: 11px;
  color: #86efac;
  font-weight: 700;
  margin-top: 6px;
}

.tv-poke-card {
  background: linear-gradient(135deg, rgba(124, 45, 18, 0.85), rgba(88, 28, 135, 0.85));
  border: 2px solid #fbbf24;
  border-radius: 14px;
  padding: 10px 16px;
  text-align: center;
  box-shadow: 0 0 22px rgba(251, 191, 36, 0.35);
}

.tv-poke-tag {
  font-size: 9.5px;
  font-weight: 900;
  color: #fde68a;
  letter-spacing: 0.5px;
}

.tv-poke-emoji {
  font-size: 36px;
  margin: 3px 0;
}

.tv-poke-name {
  font-weight: 900;
  font-size: 15px;
  color: #fff;
}

.tv-poke-pow {
  font-family: var(--font-mono);
  font-size: 12px;
  color: #86efac;
  font-weight: 800;
}

.tv-hp-track {
  height: 7px;
  background: rgba(15, 23, 42, 0.9);
  border-radius: 99px;
  overflow: hidden;
}

.tv-hp-fill {
  height: 100%;
  border-radius: 99px;
}

.tv-game-ground {
  background: rgba(6, 78, 59, 0.65);
  border-top: 2px solid rgba(52, 211, 153, 0.45);
  padding: 8px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 11.5px;
  color: #d1fae5;
  font-weight: 700;
}

.tv-mini-action {
  background: rgba(15, 23, 42, 0.85);
  color: #bae6fd;
  border: 1px solid rgba(56, 189, 248, 0.45);
  border-radius: 8px;
  padding: 5px 10px;
  font-family: inherit;
  font-size: 11.5px;
  font-weight: 800;
  cursor: pointer;
}

.tv-mini-action:hover {
  background: rgba(14, 165, 233, 0.3);
  color: #fff;
}

/* 4. ML & AI Interactive Tester Controls */
.tv-ai-tester {
  margin-top: 10px;
  padding: 10px 12px;
  background: rgba(7, 11, 25, 0.72);
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: 10px;
}

.tv-tester-title {
  font-size: 12px;
  font-weight: 800;
  color: #fde68a;
}

.tv-num-input {
  width: 78px;
  background: #0f172a;
  color: #fff;
  border: 1px solid #38bdf8;
  border-radius: 7px;
  padding: 5px 8px;
  font-family: var(--font-mono);
  font-size: 13px;
}

.tv-text-input {
  flex: 1;
  background: #0f172a;
  color: #fff;
  border: 1px solid #38bdf8;
  border-radius: 8px;
  padding: 7px 10px;
  font-family: inherit;
  font-size: 13px;
}

.tv-preset-chip {
  background: rgba(30, 41, 72, 0.85);
  color: #e0f2fe;
  border: 1px solid rgba(125, 211, 252, 0.3);
  border-radius: 99px;
  padding: 4px 10px;
  font-size: 11.5px;
  font-weight: 700;
  cursor: pointer;
}

.tv-preset-chip:hover {
  background: rgba(56, 189, 248, 0.28);
}

.tv-pred-banner {
  margin-top: 9px;
  padding: 8px 12px;
  border-radius: 9px;
  background: linear-gradient(90deg, rgba(22, 163, 74, 0.28), rgba(14, 165, 233, 0.25));
  border: 1px solid rgba(74, 222, 128, 0.5);
  color: #ecfdf5;
  font-weight: 800;
  font-size: 13px;
  text-align: center;
}

.tv-tree-diagram {
  text-align: center;
  padding: 8px 0;
}

.tv-tree-root {
  display: inline-block;
  background: rgba(79, 70, 229, 0.35);
  border: 1px solid #818cf8;
  color: #fff;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 13px;
  padding: 7px 16px;
  border-radius: 10px;
  margin-bottom: 12px;
}

.tv-tree-branches {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.tv-tree-leaf {
  padding: 9px 10px;
  border-radius: 10px;
  background: rgba(30, 41, 59, 0.65);
  border: 1px solid rgba(148, 163, 184, 0.25);
  font-size: 12.5px;
  font-weight: 800;
  color: #94a3b8;
  transition: all 0.2s ease;
}

.tv-leaf-active-win {
  background: rgba(22, 163, 74, 0.35);
  border-color: #4ade80;
  color: #dcfce7;
  box-shadow: 0 0 16px rgba(74, 222, 128, 0.32);
}

.tv-leaf-active-lose {
  background: rgba(220, 38, 38, 0.32);
  border-color: #f87171;
  color: #fee2e2;
  box-shadow: 0 0 16px rgba(248, 113, 113, 0.3);
}

/* =====================================================================
   SECTION 3: GLOSSARY & SYMBOLS GUIDE ("HAR CHEEZ KA MATLAB")
   ===================================================================== */
.tv-glossary-toolbar {
  padding: 18px 22px;
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
}

.tv-search-box {
  flex: 1;
  min-width: 240px;
  background: rgba(9, 14, 30, 0.82);
  border: 1px solid var(--glass-border-bright);
  border-radius: 12px;
  padding: 10px 15px;
  color: #fff;
  font-family: inherit;
  font-size: 14px;
}

.tv-filter-pills {
  display: flex;
  gap: 7px;
  flex-wrap: wrap;
}

.tv-symbols-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 14px;
  margin-bottom: 26px;
}

.tv-symbol-card {
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.tv-symbol-big {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 900;
  color: #fde68a;
  background: rgba(251, 191, 36, 0.14);
  border: 1px solid rgba(251, 191, 36, 0.38);
  padding: 4px 12px;
  border-radius: 10px;
  display: inline-block;
}

.tv-glossary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: 14px;
}

/* =====================================================================
   SECTION 4: READY MINI-PROJECTS & FREE SANDBOX PLAYGROUND
   ===================================================================== */
.tv-projects-strip {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 12px;
  margin-bottom: 18px;
}

.tv-proj-card {
  padding: 15px 16px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 10px;
}

.tv-proj-card:hover, .tv-proj-card.active {
  border-color: #38bdf8;
  background: rgba(30, 48, 88, 0.72);
  transform: translateY(-2px);
}

/* =====================================================================
   SECTION 5: PROGRESS & CERTIFICATE
   ===================================================================== */
.tv-cert-layout {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 22px;
  align-items: start;
}

.tv-cert-canvas-wrap {
  padding: 18px;
  text-align: center;
}

#tv-cert-canvas {
  width: 100%;
  max-width: 860px;
  height: auto;
  border-radius: 14px;
  box-shadow: 0 16px 45px rgba(0, 0, 0, 0.65);
  border: 1px solid rgba(251, 191, 36, 0.45);
}

/* =====================================================================
   COUNTRY & LANGUAGE MODAL
   ===================================================================== */
.tv-modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 250;
  background: rgba(3, 6, 17, 0.78);
  backdrop-filter: blur(10px);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 18px;
}

.tv-modal-backdrop.open {
  display: flex;
}

.tv-modal-card {
  width: 100%;
  max-width: 580px;
  padding: 24px 26px;
  border: 1px solid rgba(251, 191, 36, 0.45);
}

.tv-country-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin: 16px 0;
}

.tv-country-opt {
  background: rgba(15, 23, 42, 0.78);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 11px 13px;
  color: #f1f5f9;
  font-family: inherit;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 10px;
  text-align: left;
  transition: all 0.16s ease;
}

.tv-country-opt:hover {
  border-color: #38bdf8;
  background: rgba(30, 41, 72, 0.85);
}

.tv-country-opt.selected {
  border-color: #fbbf24;
  background: rgba(251, 191, 36, 0.14);
}

/* =====================================================================
   RESPONSIVE BREAKPOINTS (TABLETS & PHONES)
   ===================================================================== */
@media (max-width: 1120px) {
  .tv-classroom-layout {
    grid-template-columns: 1fr;
  }
  .tv-chapter-sidebar {
    position: static;
    max-height: none;
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding: 12px;
  }
  .tv-sidebar-title {
    display: none;
  }
  .tv-sidebar-item {
    min-width: 205px;
    margin-bottom: 0;
  }
  .tv-cert-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 960px) {
  .tv-hero-card,
  .tv-courses-grid,
  .tv-example-grid,
  .tv-lab-split {
    grid-template-columns: 1fr;
  }
  .tv-track-switcher {
    grid-template-columns: repeat(2, 1fr);
  }
  .tv-lab-modes {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .tv-track-switcher,
  .tv-country-grid {
    grid-template-columns: 1fr;
  }
  .tv-app-shell {
    padding: 14px 12px 48px;
  }
}

/* =====================================================================
   MASTER UPGRADE: VOICE TEACHER, MISTAKES, QUIZZES, VIVA, XP, ADS & FOOTER
   ===================================================================== */

/* XP Chip in Topbar */
.tv-xp-chip {
  background: linear-gradient(135deg, rgba(234, 179, 8, 0.22), rgba(249, 115, 22, 0.22));
  border: 1px solid rgba(250, 204, 21, 0.5);
  color: #fde047;
  font-weight: 800;
  font-size: 12.5px;
  padding: 6px 11px;
  border-radius: 99px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: inherit;
  transition: transform 0.16s ease;
}
.tv-xp-chip:hover {
  transform: translateY(-1px);
}

/* Voice Teacher Button */
.tv-voice-btn {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.22), rgba(14, 165, 233, 0.24));
  border: 1px solid rgba(52, 211, 153, 0.55);
  color: #a7f3d0;
  font-family: inherit;
  font-size: 12.5px;
  font-weight: 800;
  padding: 6px 13px;
  border-radius: 99px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
}
.tv-voice-btn:hover {
  background: rgba(16, 185, 129, 0.34);
  color: #ffffff;
}
.tv-voice-btn.speaking {
  background: rgba(239, 68, 68, 0.28);
  border-color: #f87171;
  color: #fecaca;
  animation: tvPulseSpeak 1.2s infinite;
}
@keyframes tvPulseSpeak {
  0%, 100% { box-shadow: 0 0 0 0 rgba(248, 113, 113, 0.45); }
  50% { box-shadow: 0 0 0 8px rgba(248, 113, 113, 0); }
}

/* Common Beginner Mistake Card (❌ Wrong vs ✅ Right) */
.tv-mistake-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 10px;
}
.tv-mistake-box {
  border-radius: 12px;
  padding: 11px 13px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  white-space: pre-wrap;
  overflow-x: auto;
}
.tv-mistake-wrong {
  background: rgba(127, 29, 29, 0.32);
  border: 1px solid rgba(248, 113, 113, 0.48);
  color: #fecaca;
}
.tv-mistake-right {
  background: rgba(20, 83, 45, 0.34);
  border: 1px solid rgba(74, 222, 128, 0.48);
  color: #bbf7d0;
}

/* MCQ Quiz Cards & Option Buttons */
.tv-quiz-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 16px;
}
.tv-quiz-card {
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.tv-mcq-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.tv-mcq-opt {
  background: rgba(15, 23, 42, 0.78);
  border: 1px solid rgba(148, 163, 184, 0.28);
  color: #f1f5f9;
  border-radius: 10px;
  padding: 9px 12px;
  font-family: inherit;
  font-size: 13px;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  transition: all 0.16s ease;
}
.tv-mcq-opt:hover {
  border-color: #38bdf8;
  background: rgba(30, 41, 72, 0.85);
}
.tv-mcq-opt.correct {
  background: rgba(22, 163, 74, 0.32);
  border-color: #4ade80;
  color: #dcfce7;
  font-weight: 800;
}
.tv-mcq-opt.wrong {
  background: rgba(220, 38, 38, 0.28);
  border-color: #f87171;
  color: #fee2e2;
}
.tv-mcq-exp {
  padding: 9px 12px;
  border-radius: 10px;
  background: rgba(14, 165, 233, 0.12);
  border-left: 3px solid #38bdf8;
  font-size: 12.5px;
  color: #e2e8f0;
}

/* Viva & Interview Q&A Cards */
.tv-viva-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 14px;
}
.tv-viva-card {
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.tv-viva-ans {
  padding: 10px 12px;
  background: rgba(9, 14, 30, 0.72);
  border: 1px solid rgba(52, 211, 153, 0.28);
  border-radius: 10px;
}

/* Personal Chapter Revision Notes */
.tv-notes-textarea {
  width: 100%;
  min-height: 92px;
  background: rgba(7, 11, 24, 0.82);
  border: 1px solid rgba(148, 163, 184, 0.28);
  border-radius: 12px;
  padding: 11px 14px;
  color: #f8fafc;
  font-family: inherit;
  font-size: 13.5px;
  line-height: 1.55;
  resize: vertical;
}
.tv-notes-textarea:focus {
  outline: none;
  border-color: #38bdf8;
}

/* Fullscreen Preview Mode */
.tv-preview-card.tv-preview-fullscreen {
  position: fixed;
  inset: 18px;
  z-index: 950;
  background: #0b1124;
  border: 2px solid #38bdf8;
  display: flex;
  flex-direction: column;
  box-shadow: 0 25px 80px rgba(0, 0, 0, 0.85);
}
.tv-preview-card.tv-preview-fullscreen .tv-preview-stage {
  flex: 1;
  min-height: 0;
  max-height: none;
}
.tv-preview-card.tv-preview-fullscreen .tv-browser-iframe {
  height: calc(100vh - 150px);
}

/* Achievements Badges & Career Roadmaps */
.tv-badges-row {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(195px, 1fr));
  gap: 12px;
}
.tv-badge-card {
  padding: 12px 14px;
  border-radius: 14px;
  background: rgba(15, 23, 42, 0.65);
  border: 1px solid rgba(148, 163, 184, 0.2);
  display: flex;
  align-items: center;
  gap: 10px;
  opacity: 0.55;
  transition: all 0.2s ease;
}
.tv-badge-card.unlocked {
  opacity: 1;
  background: linear-gradient(135deg, rgba(49, 46, 129, 0.58), rgba(14, 116, 144, 0.42));
  border-color: rgba(250, 204, 21, 0.6);
  box-shadow: 0 6px 18px rgba(250, 204, 21, 0.14);
}
.tv-careers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(265px, 1fr));
  gap: 14px;
}
.tv-career-card {
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 7px;
}

/* Google AdSense & Policy-Compliant Sponsor Banner Slots */
.tv-ad-slot {
  margin: 18px 0;
}
.tv-ad-shell {
  background: rgba(11, 17, 36, 0.68);
  border: 1px dashed rgba(148, 163, 184, 0.28);
  border-radius: 14px;
  padding: 8px 14px 12px;
}
.tv-ad-label-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 10px;
  letter-spacing: 0.8px;
  font-weight: 700;
  color: #64748b;
  margin-bottom: 6px;
}
.tv-ad-cfg-link {
  background: none;
  border: none;
  color: #7dd3fc;
  font-size: 11px;
  cursor: pointer;
  font-family: inherit;
  padding: 0;
}
.tv-ad-cfg-link:hover {
  text-decoration: underline;
}
.tv-house-ad-body {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
}
.tv-house-ad-icon {
  width: 40px;
  height: 40px;
  border-radius: 11px;
  background: rgba(56, 189, 248, 0.15);
  border: 1px solid rgba(56, 189, 248, 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}
.tv-house-ad-cta {
  background: linear-gradient(135deg, #4f46e5, #0ea5e9);
  color: #ffffff;
  text-decoration: none;
  border: none;
  padding: 8px 15px;
  border-radius: 99px;
  font-size: 12.5px;
  font-weight: 800;
  cursor: pointer;
  font-family: inherit;
  white-space: nowrap;
}

/* Global Footer */
.tv-global-footer {
  max-width: 1420px;
  margin: 10px auto 28px;
  padding: 20px 24px;
}
.tv-footer-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}
.tv-footer-links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.tv-footer-link {
  background: none;
  border: none;
  color: #94a3b8;
  font-family: inherit;
  font-size: 12.5px;
  font-weight: 600;
  cursor: pointer;
  padding: 2px 4px;
}
.tv-footer-link:hover {
  color: #fde68a;
  text-decoration: underline;
}

/* Toast Notification */
.tv-toast-container {
  position: fixed;
  bottom: 22px;
  right: 22px;
  z-index: 1200;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}
.tv-toast-pop {
  background: linear-gradient(135deg, rgba(15, 23, 42, 0.96), rgba(30, 58, 138, 0.96));
  border: 1px solid #fbbf24;
  color: #fff;
  padding: 11px 16px;
  border-radius: 12px;
  font-size: 13px;
  font-weight: 800;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.55);
  animation: tvToastIn 0.25s ease;
}
@keyframes tvToastIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 780px) {
  .tv-mistake-grid,
  .tv-mcq-options,
  .tv-quiz-grid,
  .tv-viva-grid {
    grid-template-columns: 1fr;
  }
}