/* ==========================================================================
   UECINEMA K11 — Cinematic Onboarding Hub Stylesheet
   Color Architecture (60-30-10 Visual Ratio):
   - 60% Warm Burnt Orange & Deep Crimson-Terracotta (Canvas, Hero, Bands, Accents)
   - 30% Obsidian & Warm Charcoal (Cards, Header, Video Stage, Grounded Panels)
   - 10% Crisp White & Alabaster (Typography, Badges, Key Highlights, Focus Rings)
   ========================================================================== */

:root {
  /* 60% Dominant Family: Burnt Orange & Deep Crimson-Terracotta */
  --c-crimson-deep: #3D100C;
  --c-crimson-base: #541610;
  --c-crimson-mid: #6E1E14;
  --c-terracotta: #8C2818;
  --c-burnt-orange: #B5381A;
  --c-amber-flame: #D94B1E;
  --c-orange-bright: #EA5B25;
  --c-orange-glow: #FF7842;

  /* 30% Secondary Family: Obsidian & Warm Charcoal */
  --c-obsidian: #0E0A09;
  --c-charcoal-deep: #150F0D;
  --c-charcoal-card: #1B1311;
  --c-charcoal-elevated: #241916;
  --c-charcoal-hover: #2D1F1B;

  /* 10% Accent & Typography Family: Pure White & Warm Ivory */
  --c-white: #FFFFFF;
  --c-ivory: #FAF4F0;
  --c-text-secondary: #EFE2DA;
  --c-text-muted: #D4BDB0;

  /* Borders & Subtle Dividers */
  --border-warm: rgba(255, 130, 80, 0.28);
  --border-warm-strong: rgba(255, 145, 95, 0.52);
  --border-white-subtle: rgba(255, 255, 255, 0.16);
  --border-white-strong: rgba(255, 255, 255, 0.85);

  /* Typography */
  --font-sans: 'Be Vietnam Pro', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Consolas, monospace;

  /* Spacing & Layout */
  --container-max: 1120px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;

  /* Shadows */
  --shadow-cinema: 0 20px 45px -15px rgba(10, 4, 3, 0.7), 0 0 1px 1px rgba(255, 120, 66, 0.2);
  --shadow-card: 0 12px 28px -8px rgba(12, 5, 4, 0.65);
  --shadow-glow: 0 8px 24px -4px rgba(217, 75, 30, 0.45);
}

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

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

body {
  font-family: var(--font-sans);
  color: var(--c-ivory);
  /* 60% Cam-Đỏ dominant atmospheric canvas */
  background-color: var(--c-crimson-base);
  background-image:
    radial-gradient(circle at 18% 12%, rgba(217, 75, 30, 0.42) 0%, transparent 45%),
    radial-gradient(circle at 84% 28%, rgba(181, 56, 26, 0.38) 0%, transparent 48%),
    radial-gradient(circle at 50% 68%, rgba(140, 40, 24, 0.45) 0%, transparent 55%),
    linear-gradient(180deg, #5A1811 0%, #752216 28%, #4B140E 58%, #6B1E14 82%, #360E0A 100%);
  background-attachment: scroll;
  line-height: 1.65;
  min-height: 100vh;
  overflow-x: clip;
  -webkit-font-smoothing: antialiased;
}

/* Skip Link for Keyboard Accessibility */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  z-index: 1000;
  background: var(--c-white);
  color: var(--c-obsidian);
  padding: 0.75rem 1.25rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  text-decoration: none;
  box-shadow: var(--shadow-cinema);
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 1rem;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Global Keyboard Focus State */
:focus-visible {
  outline: 2px solid var(--c-white);
  outline-offset: 3px;
  box-shadow: 0 0 0 5px rgba(234, 91, 37, 0.55);
}

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.25rem;
}

@media (min-width: 768px) {
  .container {
    padding: 0 2rem;
  }
}

/* ==========================================================================
   Top Navigation Bar (30% Charcoal Grounding + 10% White & Orange Highlights)
   ========================================================================== */
.site-navbar {
  position: sticky;
  top: 0;
  z-index: 90;
  background: rgba(18, 12, 10, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-warm);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 4.25rem;
  gap: 1rem;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--c-white);
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: 0.04em;
}

.brand-mark {
  width: 2.15rem;
  height: 2.15rem;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--c-orange-bright), var(--c-crimson-mid));
  border: 1px solid rgba(255, 255, 255, 0.35);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(217, 75, 30, 0.4);
  flex-shrink: 0;
}

.brand-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.15rem 0.5rem;
  background: var(--c-white);
  color: var(--c-crimson-deep);
  border-radius: 4px;
  letter-spacing: 0.05em;
}

.nav-links {
  display: none;
  align-items: center;
  gap: 0.15rem;
  list-style: none;
}

@media (min-width: 960px) {
  .nav-links {
    display: flex;
  }
}

.nav-links a {
  color: var(--c-text-secondary);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 600;
  padding: 0.45rem 0.7rem;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  transition: color 0.2s ease, background-color 0.2s ease;
}

.nav-links a:hover {
  color: var(--c-white);
  background: rgba(217, 75, 30, 0.22);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, var(--c-orange-bright) 0%, var(--c-burnt-orange) 100%);
  color: var(--c-white);
  text-decoration: none;
  font-weight: 700;
  font-size: 0.875rem;
  padding: 0.55rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.28);
  box-shadow: 0 4px 14px rgba(217, 75, 30, 0.35);
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  white-space: nowrap;
}

.nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(234, 91, 37, 0.55);
  background: linear-gradient(135deg, #F56930 0%, #C83E1B 100%);
}

@media (max-width: 480px) {
  .navbar-inner {
    min-height: 3.75rem;
    gap: 0.5rem;
  }
  .brand-logo {
    font-size: 0.92rem;
    gap: 0.45rem;
  }
  .brand-mark {
    width: 1.85rem;
    height: 1.85rem;
  }
  .nav-cta {
    font-size: 0.8rem;
    padding: 0.45rem 0.75rem;
    gap: 0.35rem;
  }
}

/* ==========================================================================
   Hero & First Session Section (Cinematic Depth, 60% Burnt Orange/Red Stage)
   ========================================================================== */
.hero-section {
  position: relative;
  padding: 2.75rem 0 3.5rem;
  overflow: hidden;
  border-bottom: 1px solid var(--border-warm);
  background:
    radial-gradient(ellipse at 50% 0%, rgba(234, 91, 37, 0.45) 0%, rgba(140, 40, 24, 0.25) 55%, transparent 80%),
    linear-gradient(180deg, #7A2215 0%, #591710 60%, #44120C 100%);
}

@media (min-width: 768px) {
  .hero-section {
    padding: 4rem 0 4.5rem;
  }
}

.hero-backdrop-art {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.52;
  pointer-events: none;
  mix-blend-mode: screen;
}

.hero-vignette {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 50% 38%, transparent 20%, rgba(45, 11, 8, 0.68) 100%),
    linear-gradient(180deg, rgba(18, 10, 8, 0.25) 0%, rgba(61, 16, 12, 0.65) 100%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
}

/* Camera Viewfinder Top Bar */
.cinema-hud {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.18);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--c-white);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.hud-group {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
}

.rec-dot {
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background-color: var(--c-white);
  box-shadow: 0 0 0 3px rgba(234, 91, 37, 0.85);
  display: inline-block;
}

.hud-tag {
  padding: 0.2rem 0.55rem;
  background: rgba(18, 11, 9, 0.65);
  border: 1px solid var(--border-warm-strong);
  border-radius: 4px;
  color: var(--c-white);
}

/* Main Hero Heading */
.hero-header {
  text-align: center;
  max-width: 860px;
  margin: 0 auto 2.25rem;
}

.hero-title {
  font-size: clamp(2rem, 4.6vw, 3.6rem);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.015em;
  color: var(--c-white);
  text-shadow: 0 4px 24px rgba(14, 5, 4, 0.65);
}

.hero-title-highlight {
  display: inline-block;
  padding: 0.05em 0.35em;
  margin-top: 0.15rem;
  background: linear-gradient(135deg, var(--c-orange-bright) 0%, var(--c-burnt-orange) 100%);
  color: var(--c-white);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.35);
  box-shadow: 0 8px 25px rgba(18, 6, 4, 0.45);
}

/* First Session Card (#thong-tin-chinh) */
.session-spotlight {
  background: linear-gradient(145deg, rgba(24, 16, 14, 0.94) 0%, rgba(36, 20, 17, 0.94) 100%);
  border: 1px solid var(--border-warm-strong);
  border-radius: var(--radius-xl);
  padding: 1.75rem 1.35rem;
  box-shadow: var(--shadow-cinema);
  position: relative;
  overflow: hidden;
}

@media (min-width: 768px) {
  .session-spotlight {
    padding: 2.25rem 2.5rem;
  }
}

.session-spotlight::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--c-orange-bright), var(--c-white), var(--c-orange-bright));
}

.session-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  align-items: center;
}

@media (min-width: 860px) {
  .session-grid {
    grid-template-columns: 1.35fr 1fr;
    gap: 2rem;
  }
}

.session-label-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 0.85rem;
}

.session-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--c-white);
  color: var(--c-crimson-deep);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 800;
  text-transform: uppercase;
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  letter-spacing: 0.04em;
}

.session-heading {
  font-size: clamp(1.35rem, 2.4vw, 1.75rem);
  font-weight: 800;
  color: var(--c-white);
  line-height: 1.3;
}

.schedule-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.85rem;
  margin: 1rem 0 1.15rem;
}

@media (min-width: 560px) {
  .schedule-cards {
    grid-template-columns: 1.15fr 1fr;
  }
}

.schedule-pill {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  padding: 1rem 1.1rem;
  background: linear-gradient(135deg, rgba(181, 56, 26, 0.36) 0%, rgba(110, 30, 20, 0.28) 100%);
  border: 1px solid var(--border-warm-strong);
  border-radius: var(--radius-md);
}

.schedule-icon {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 10px;
  background: var(--c-orange-bright);
  color: var(--c-white);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  border: 1px solid rgba(255, 255, 255, 0.35);
}

.schedule-meta-label {
  display: block;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--c-text-secondary);
  font-family: var(--font-mono);
  margin-bottom: 0.15rem;
}

.schedule-meta-value {
  display: block;
  font-size: 1.06rem;
  font-weight: 700;
  color: var(--c-white);
  line-height: 1.35;
}

.schedule-note {
  color: var(--c-text-secondary);
  font-size: 0.96rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Right Action Column in Hero */
.session-actions-panel {
  background: linear-gradient(155deg, #9E2F19 0%, #6D1D12 100%);
  border: 1px solid rgba(255, 255, 255, 0.26);
  border-radius: var(--radius-lg);
  padding: 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.action-panel-title {
  font-size: 0.85rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--c-white);
  opacity: 0.92;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.95rem;
  padding: 0.8rem 1.25rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.18s ease, background-color 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
  line-height: 1.3;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn:active {
  transform: translateY(0);
}

.btn-white-primary {
  background: var(--c-white);
  color: var(--c-crimson-deep);
  border-color: var(--c-white);
  box-shadow: 0 6px 20px rgba(14, 5, 4, 0.38);
}

.btn-white-primary:hover {
  background: var(--c-ivory);
  box-shadow: 0 8px 24px rgba(255, 255, 255, 0.25);
}

.btn-orange-primary {
  background: linear-gradient(135deg, var(--c-orange-bright) 0%, var(--c-burnt-orange) 100%);
  color: var(--c-white);
  border-color: rgba(255, 255, 255, 0.32);
  box-shadow: var(--shadow-glow);
}

.btn-orange-primary:hover {
  background: linear-gradient(135deg, #F56A32 0%, #C83E1B 100%);
}

.btn-charcoal-outline {
  background: rgba(18, 12, 10, 0.78);
  color: var(--c-white);
  border-color: rgba(255, 255, 255, 0.35);
}

.btn-charcoal-outline:hover {
  background: rgba(18, 12, 10, 0.95);
  border-color: var(--c-white);
}

/* ==========================================================================
   Section Layout & Warm Burnt-Orange / Crimson Surface Bands (60% Ratio)
   ========================================================================== */
.section-block {
  padding: 3.5rem 0;
  position: relative;
}

@media (min-width: 768px) {
  .section-block {
    padding: 4.5rem 0;
  }
}

.section-warm-terracotta {
  background: linear-gradient(180deg, rgba(140, 40, 24, 0.48) 0%, rgba(92, 24, 16, 0.58) 100%);
  border-bottom: 1px solid var(--border-warm);
}

.section-warm-burnt {
  background:
    radial-gradient(circle at 85% 20%, rgba(234, 91, 37, 0.28) 0%, transparent 50%),
    linear-gradient(180deg, #6B1E14 0%, #4E140E 100%);
  border-bottom: 1px solid var(--border-warm);
}

.section-header {
  max-width: 720px;
  margin: 0 auto 2.25rem;
  text-align: center;
}

.section-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--c-white);
  background: rgba(217, 75, 30, 0.45);
  border: 1px solid rgba(255, 255, 255, 0.28);
  padding: 0.28rem 0.75rem;
  border-radius: 999px;
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: clamp(1.65rem, 3vw, 2.35rem);
  font-weight: 800;
  color: var(--c-white);
  line-height: 1.26;
  margin-bottom: 0.6rem;
}

.section-desc {
  color: var(--c-text-secondary);
  font-size: 1.02rem;
}

/* ==========================================================================
   Checklist Progress Bar & Interactive Tasks (#checklist)
   ========================================================================== */
.checklist-progress-bar {
  background: var(--c-charcoal-deep);
  border: 1px solid var(--border-warm-strong);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  margin-bottom: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  box-shadow: var(--shadow-card);
}

@media (min-width: 640px) {
  .checklist-progress-bar {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.progress-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.progress-count-badge {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  padding: 0.25rem 0.65rem;
  border-radius: 6px;
  background: var(--c-orange-bright);
  color: var(--c-white);
}

.progress-track {
  flex-grow: 1;
  max-width: 340px;
  height: 10px;
  background: rgba(255, 255, 255, 0.12);
  border-radius: 999px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--c-orange-bright), var(--c-white));
  border-radius: 999px;
  transition: width 0.3s ease;
}

.checklist-stack {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.task-item {
  background: var(--c-charcoal-card);
  border: 1px solid var(--border-warm);
  border-left: 5px solid var(--c-orange-bright);
  border-radius: var(--radius-lg);
  padding: 1.35rem 1.25rem;
  box-shadow: var(--shadow-card);
  transition: border-color 0.2s ease, background-color 0.2s ease, transform 0.2s ease;
}

@media (min-width: 768px) {
  .task-item {
    padding: 1.65rem 1.85rem;
  }
}

.task-item:hover {
  border-color: var(--border-warm-strong);
  background: var(--c-charcoal-elevated);
}

.task-item.completed {
  border-left-color: var(--c-white);
  background: rgba(20, 14, 12, 0.88);
}

.task-header-label {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  cursor: pointer;
  user-select: none;
}

.task-checkbox-input {
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
}

.icon-check {
  width: 1.65rem;
  height: 1.65rem;
  margin-top: 0.15rem;
  border: 2px solid rgba(255, 255, 255, 0.55);
  border-radius: 6px;
  background: rgba(14, 10, 9, 0.65);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.15s ease;
}

.task-checkbox-input:focus-visible + .task-header-label .icon-check {
  outline: 2px solid var(--c-white);
  outline-offset: 3px;
  box-shadow: 0 0 0 4px rgba(234, 91, 37, 0.65);
}

.icon-check svg {
  width: 1rem;
  height: 1rem;
  color: var(--c-crimson-deep);
  opacity: 0;
  transform: scale(0.7);
  transition: opacity 0.15s ease, transform 0.15s ease;
}

.task-item.completed .icon-check {
  background-color: var(--c-white);
  border-color: var(--c-white);
}

.task-item.completed .icon-check svg {
  opacity: 1;
  transform: scale(1);
}

.task-label-text {
  flex-grow: 1;
}

.task-step-number {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--c-orange-glow);
  display: block;
  margin-bottom: 0.15rem;
}

.task-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--c-white);
  display: block;
  transition: color 0.2s ease;
}

.task-item.completed .task-title {
  text-decoration: line-through;
  color: var(--c-text-muted);
}

.task-subtitle {
  font-size: 0.95rem;
  color: var(--c-text-secondary);
  margin-top: 0.25rem;
}

.task-body {
  margin-top: 1.15rem;
  padding-left: 0;
}

@media (min-width: 640px) {
  .task-body {
    padding-left: 2.65rem;
  }
}

/* Channel Buttons Grid (Task 1) */
.channel-buttons-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
}

@media (min-width: 640px) {
  .channel-buttons-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.channel-card-link {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 1rem 1.15rem;
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--c-white);
  background: linear-gradient(145deg, #8E2818 0%, #5E1910 100%);
  border: 1px solid rgba(255, 255, 255, 0.24);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.channel-card-link:hover {
  transform: translateY(-2px);
  border-color: var(--c-white);
  box-shadow: var(--shadow-glow);
}

.channel-card-link.primary-channel {
  background: linear-gradient(145deg, var(--c-orange-bright) 0%, var(--c-burnt-orange) 100%);
  border-color: rgba(255, 255, 255, 0.45);
}

.channel-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  opacity: 0.9;
}

.channel-card-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--c-white);
}

/* Software List Grid (Task 2) */
.software-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
  list-style: none;
}

@media (min-width: 700px) {
  .software-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.software-item {
  background: rgba(14, 10, 9, 0.72);
  border: 1px solid var(--border-warm);
  border-radius: var(--radius-md);
  padding: 0.95rem 1.1rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 0.65rem;
}

.software-item.featured-software {
  background: linear-gradient(135deg, rgba(181, 56, 26, 0.34) 0%, rgba(92, 24, 16, 0.28) 100%);
  border-color: var(--border-warm-strong);
}

.software-item-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.software-name {
  font-weight: 700;
  color: var(--c-white);
  font-size: 1rem;
}

.software-version {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  background: var(--c-white);
  color: var(--c-crimson-deep);
}

.software-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
}

.software-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--c-white);
  background: rgba(217, 75, 30, 0.38);
  border: 1px solid rgba(255, 255, 255, 0.28);
  padding: 0.38rem 0.75rem;
  border-radius: 6px;
  text-decoration: none;
  transition: background-color 0.18s ease, border-color 0.18s ease;
}

.software-link:hover {
  background: var(--c-orange-bright);
  border-color: var(--c-white);
}

.software-link-secondary {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.22);
}

/* Video List & Inline Player (Tasks 3 & 4) */
.video-list-container {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.video-item-wrapper {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(14, 10, 9, 0.75);
  transition: border-color 0.2s ease;
}

.video-item-wrapper:hover {
  border-color: var(--border-warm-strong);
}

.video-row-header {
  display: flex;
  align-items: stretch;
  justify-content: space-between;
}

.video-trigger {
  flex-grow: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.85rem;
  width: 100%;
  text-align: left;
  background: transparent;
  color: var(--c-white);
  padding: 0.85rem 1rem;
  border: none;
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: 0.96rem;
  font-weight: 600;
  transition: background-color 0.18s ease;
}

.video-trigger:hover {
  background: rgba(217, 75, 30, 0.2);
}

.video-trigger.active {
  background: linear-gradient(90deg, rgba(217, 75, 30, 0.45), rgba(140, 40, 24, 0.3));
  border-bottom: 1px solid var(--border-warm-strong);
}

.video-trigger-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.video-play-badge {
  width: 2rem;
  height: 2rem;
  border-radius: 6px;
  background: rgba(217, 75, 30, 0.35);
  border: 1px solid rgba(255, 255, 255, 0.25);
  color: var(--c-white);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.video-trigger.active .video-play-badge {
  background: var(--c-white);
  color: var(--c-crimson-deep);
}

.video-external-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 0.85rem;
  color: var(--c-text-secondary);
  border-left: 1px solid rgba(255, 255, 255, 0.1);
  text-decoration: none;
  font-size: 0.8rem;
  font-family: var(--font-mono);
  white-space: nowrap;
  transition: color 0.18s ease, background-color 0.18s ease;
}

@media (max-width: 560px) {
  .video-status-label {
    display: none;
  }
  .video-trigger {
    padding: 0.75rem 0.8rem;
    font-size: 0.92rem;
  }
  .video-external-link {
    padding: 0 0.6rem;
    font-size: 0.74rem;
  }
}

.video-external-link:hover {
  color: var(--c-white);
  background: rgba(255, 255, 255, 0.08);
}

.video-player-container {
  padding: 1rem;
  background: var(--c-obsidian);
}

.video-player-container.hidden {
  display: none;
}

.aspect-video {
  position: relative;
  width: 100%;
  padding-top: 56.25%;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--border-warm);
  background: #000;
}

.aspect-video iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.task-actions-row {
  margin-top: 1rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
}

/* ==========================================================================
   AI Creative Toolkit (#creative-ai-toolkit)
   ========================================================================== */
.toolkit-panel {
  background: linear-gradient(150deg, var(--c-charcoal-card) 0%, #261410 100%);
  border: 1px solid var(--border-warm-strong);
  border-radius: var(--radius-xl);
  padding: 1.5rem 1.25rem;
  box-shadow: var(--shadow-cinema);
}

@media (min-width: 768px) {
  .toolkit-panel {
    padding: 2.25rem;
  }
}

.prompt-chips {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.prompt-chip-label {
  font-size: 0.82rem;
  color: var(--c-text-secondary);
  font-family: var(--font-mono);
  margin-right: 0.25rem;
}

.prompt-chip {
  background: rgba(217, 75, 30, 0.25);
  color: var(--c-white);
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 999px;
  padding: 0.3rem 0.75rem;
  font-size: 0.82rem;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: background-color 0.18s ease, border-color 0.18s ease;
}

.prompt-chip:hover {
  background: var(--c-orange-bright);
  border-color: var(--c-white);
}

.idea-form-row {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

@media (min-width: 640px) {
  .idea-form-row {
    flex-direction: row;
  }
}

.idea-input {
  flex-grow: 1;
  background: rgba(12, 8, 7, 0.85);
  color: var(--c-white);
  border: 1px solid var(--border-warm-strong);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1.1rem;
  font-family: var(--font-sans);
  font-size: 1rem;
}

.idea-input::placeholder {
  color: var(--c-text-muted);
}

.idea-result-box {
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-warm);
}

.idea-result-box.hidden {
  display: none;
}

.idea-cards-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

@media (min-width: 768px) {
  .idea-cards-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.idea-subcard {
  background: rgba(14, 10, 9, 0.75);
  border: 1px solid var(--border-warm);
  border-radius: var(--radius-md);
  padding: 1.15rem;
}

.idea-subcard h4 {
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--c-white);
  margin-bottom: 0.6rem;
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.idea-subcard p,
.idea-subcard ul {
  color: var(--c-text-secondary);
  font-size: 0.94rem;
}

.idea-subcard ul {
  padding-left: 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

/* ==========================================================================
   Resource Library (#tai-nguyen) & Bonus AI Tip (#bonus)
   ========================================================================== */
.resources-bonus-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

@media (min-width: 920px) {
  .resources-bonus-grid {
    grid-template-columns: 1fr 1.25fr;
    align-items: stretch;
  }
}

.resource-card {
  background: linear-gradient(155deg, #962B17 0%, #5B170F 100%);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-xl);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1.25rem;
  box-shadow: var(--shadow-cinema);
}

.resource-card h3 {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--c-white);
  margin-bottom: 0.5rem;
}

.resource-card p {
  color: var(--c-ivory);
  font-size: 0.98rem;
}

.bonus-card {
  background: var(--c-charcoal-card);
  border: 1px solid var(--border-warm-strong);
  border-radius: var(--radius-xl);
  padding: 1.75rem;
  box-shadow: var(--shadow-cinema);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1.25rem;
}

.bonus-card h3 {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--c-white);
  margin-bottom: 0.5rem;
}

.bonus-steps {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  margin-top: 0.75rem;
}

.bonus-steps li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  color: var(--c-text-secondary);
  font-size: 0.95rem;
}

.step-num {
  width: 1.6rem;
  height: 1.6rem;
  border-radius: 50%;
  background: var(--c-orange-bright);
  color: var(--c-white);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 0.1rem;
}

.inline-link {
  color: var(--c-white);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 3px;
  decoration-color: var(--c-orange-glow);
}

.inline-link:hover {
  color: var(--c-orange-glow);
}

/* ==========================================================================
   Footer & Floating Live Chat Button
   ========================================================================== */
.site-footer {
  background: var(--c-obsidian);
  border-top: 1px solid var(--border-warm);
  padding: 2.75rem 0;
  text-align: center;
}

.footer-greeting {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--c-white);
}

.footer-brand {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--c-orange-glow);
  margin-top: 0.4rem;
  letter-spacing: 0.08em;
}

.floating-chat-btn {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 95;
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  background: linear-gradient(135deg, var(--c-orange-bright) 0%, var(--c-burnt-orange) 100%);
  color: var(--c-white);
  padding: 0.85rem 1.15rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.4);
  box-shadow: 0 10px 28px rgba(14, 5, 4, 0.75);
  text-decoration: none;
  font-weight: 700;
  font-size: 0.9rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.floating-chat-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(234, 91, 37, 0.6);
}

@media (max-width: 480px) {
  .floating-chat-btn span {
    display: none;
  }
  .floating-chat-btn {
    padding: 0.9rem;
  }
}

/* ==========================================================================
   Accessible Summary Modal (#summary-modal)
   ========================================================================== */
.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(10, 5, 4, 0.82);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.modal-backdrop.hidden {
  display: none;
}

.modal-dialog {
  background: var(--c-charcoal-card);
  border: 1px solid var(--border-warm-strong);
  border-radius: var(--radius-xl);
  max-width: 680px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  padding: 1.5rem;
  box-shadow: var(--shadow-cinema);
}

@media (min-width: 640px) {
  .modal-dialog {
    padding: 2rem;
  }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 1rem;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-warm);
}

.modal-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--c-white);
}

.modal-close-btn {
  background: rgba(255, 255, 255, 0.1);
  color: var(--c-white);
  border: 1px solid rgba(255, 255, 255, 0.25);
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 8px;
  font-size: 1.35rem;
  line-height: 1;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.modal-close-btn:hover {
  background: var(--c-orange-bright);
  border-color: var(--c-white);
}

.summary-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.summary-item {
  background: rgba(14, 10, 9, 0.78);
  border: 1px solid var(--border-warm);
  border-left: 4px solid var(--c-orange-bright);
  border-radius: var(--radius-md);
  padding: 1rem 1.15rem;
}

.summary-item strong {
  display: block;
  color: var(--c-white);
  font-size: 1rem;
  margin-bottom: 0.3rem;
}

.summary-item p {
  color: var(--c-text-secondary);
  font-size: 0.94rem;
}

/* ==========================================================================
   Subtle Scroll Reveal & Reduced Motion Support
   ========================================================================== */
.session-grid > *,
.schedule-cards > *,
.channel-buttons-grid > *,
.software-grid > *,
.idea-cards-grid > *,
.resources-bonus-grid > * {
  min-width: 0;
}

.reveal {
  opacity: 0.96;
  transform: translateY(10px);
  transition: opacity 0.4s cubic-bezier(0.22, 1, 0.36, 1), transform 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.hidden {
  display: none !important;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .reveal {
    opacity: 1 !important;
    transform: none !important;
  }
}