/* ==========================================================================
   RoracademyAI - Modern Aesthetic Design System
   ========================================================================== */

:root {
  /* Color Palette */
  --bg-dark: #07090e;
  --bg-primary: #0b0f19;
  --bg-secondary: #111827;
  --bg-tertiary: #1f293d;
  
  --card-bg: rgba(17, 24, 39, 0.72);
  --card-bg-hover: rgba(31, 41, 61, 0.85);
  --card-border: rgba(255, 255, 255, 0.08);
  --card-border-glow: rgba(0, 240, 255, 0.35);

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --accent-cyan: #00f0ff;
  --accent-cyan-glow: rgba(0, 240, 255, 0.4);
  --accent-indigo: #6366f1;
  --accent-purple: #a855f7;
  --accent-pink: #ec4899;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-red: #ef4444;

  /* Typography */
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --font-heading: 'Syne', var(--font-sans);

  /* Layout & Spacing */
  --container-max: 1240px;
  --header-height: 76px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.45s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  color-scheme: dark;
  background-color: var(--bg-dark);
  font-family: var(--font-sans);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  background: radial-gradient(circle at 50% 0%, #131b31 0%, var(--bg-dark) 70%);
}

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Canvas & Background Mesh */
.neural-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
  opacity: 0.45;
}

.bg-mesh {
  position: fixed;
  top: -20%;
  left: -10%;
  width: 120vw;
  height: 120vh;
  background: 
    radial-gradient(circle at 20% 20%, rgba(99, 102, 241, 0.12) 0%, transparent 40%),
    radial-gradient(circle at 80% 30%, rgba(0, 240, 255, 0.10) 0%, transparent 45%),
    radial-gradient(circle at 50% 80%, rgba(168, 85, 247, 0.08) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

/* Typography Utilities */
.gradient-text {
  background: linear-gradient(135deg, var(--accent-cyan) 0%, #818cf8 50%, #c084fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.gradient-text-alt {
  background: linear-gradient(135deg, #a855f7 0%, #ec4899 50%, #fb923c 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.glow-text {
  text-shadow: 0 0 30px rgba(0, 240, 255, 0.35);
}

.text-cyan { color: var(--accent-cyan); }
.text-purple { color: var(--accent-purple); }
.text-green { color: var(--accent-emerald); }
.text-red { color: var(--accent-red); }
.font-bold { font-weight: 700; }
.text-center { text-align: center; }
.w-full { width: 100%; }
.mt-4 { margin-top: 1rem; }
.mt-6 { margin-top: 1.5rem; }

/* Glassmorphism Panel */
.glass-panel {
  background: var(--card-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.glass-panel:hover {
  border-color: rgba(255, 255, 255, 0.15);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.75rem 1.4rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
  outline: none;
}

.btn-sm {
  padding: 0.45rem 1rem;
  font-size: 0.85rem;
}

.btn-lg {
  padding: 0.9rem 2rem;
  font-size: 1.05rem;
}

.btn-primary {
  background: linear-gradient(135deg, #00f0ff 0%, #6366f1 100%);
  color: #07090e;
  font-weight: 700;
  box-shadow: 0 0 20px rgba(0, 240, 255, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(0, 240, 255, 0.5);
  filter: brightness(1.1);
}

.btn-outline {
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(255, 255, 255, 0.2);
  color: var(--text-primary);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  transform: translateY(-2px);
}

.btn-glass {
  background: rgba(17, 24, 39, 0.6);
  backdrop-filter: blur(8px);
  border-color: rgba(255, 255, 255, 0.12);
  color: var(--text-primary);
}

.btn-glass:hover {
  background: rgba(31, 41, 61, 0.8);
  border-color: var(--accent-cyan);
  transform: translateY(-2px);
}

.btn-icon {
  width: 1.15rem;
  height: 1.15rem;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background: rgba(7, 9, 14, 0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--card-border);
  z-index: 100;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  margin-right: 2.5rem;
  flex-shrink: 0;
}

.logo-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.logo-svg {
  width: 100%;
  height: 100%;
}

.brand-text {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: #fff;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
  flex-grow: 1;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
}

.nav-link:hover {
  color: var(--text-primary);
}

.nav-link:hover::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--accent-cyan);
  border-radius: 2px;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

/* Edge Status Badge */
.edge-status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.35rem 0.75rem;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-family: var(--font-mono);
  color: var(--accent-emerald);
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-emerald);
  box-shadow: 0 0 8px var(--accent-emerald);
  animation: pulse-dot 2s infinite ease-in-out;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  flex-direction: column;
  gap: 5px;
}

.mobile-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  transition: all var(--transition-fast);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
  position: relative;
  padding: 5rem 0 3.5rem;
  z-index: 1;
  text-align: center;
}

.hero-container {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.4rem 1rem;
  background: rgba(99, 102, 241, 0.15);
  border: 1px solid rgba(99, 102, 241, 0.4);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  color: #c7d2fe;
  margin-bottom: 2rem;
}

.badge-pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 10px var(--accent-cyan);
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2.4rem, 5.5vw, 4.2rem);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
  max-width: 960px;
}

.hero-description {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 780px;
  margin-bottom: 2.5rem;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 1.2rem;
  margin-bottom: 3.5rem;
}

/* Hero Metrics Ribbon */
.hero-metrics {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  padding: 1.5rem 2.5rem;
  background: rgba(17, 24, 39, 0.6);
  backdrop-filter: blur(12px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  margin-bottom: 3rem;
  max-width: 900px;
  width: 100%;
}

.metric-card {
  text-align: center;
}

.metric-value {
  font-family: var(--font-heading);
  font-size: 1.7rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.02em;
}

.metric-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: 0.2rem;
}

.metric-divider {
  width: 1px;
  height: 38px;
  background: var(--card-border);
}

/* Partner Logos */
.hero-partners {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.partners-title {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  font-weight: 600;
}

.partner-logos-track {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
}

.partner-pill {
  padding: 0.35rem 0.9rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
}

/* ==========================================================================
   Section General
   ========================================================================== */
.section {
  position: relative;
  padding: 5.5rem 0;
  z-index: 1;
}

.section-header {
  margin-bottom: 3.5rem;
}

.section-tag {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-cyan);
  padding: 0.3rem 0.8rem;
  background: rgba(0, 240, 255, 0.1);
  border: 1px solid rgba(0, 240, 255, 0.25);
  border-radius: var(--radius-full);
  margin-bottom: 0.8rem;
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 3.8vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto;
}

/* ==========================================================================
   Interactive AI Sandbox / Playground
   ========================================================================== */
.playground-card {
  overflow: hidden;
  border: 1px solid rgba(0, 240, 255, 0.2);
}

.playground-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  background: rgba(11, 15, 25, 0.8);
  border-bottom: 1px solid var(--card-border);
}

.playground-tabs {
  display: flex;
  gap: 0.5rem;
}

.pg-tab {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-secondary);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: all var(--transition-fast);
}

.pg-tab:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

.pg-tab.active {
  color: var(--accent-cyan);
  background: rgba(0, 240, 255, 0.1);
  border-color: rgba(0, 240, 255, 0.3);
}

.playground-edge-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-emerald);
}

.dot-green {
  width: 6px;
  height: 6px;
  background: var(--accent-emerald);
  border-radius: 50%;
  box-shadow: 0 0 6px var(--accent-emerald);
}

.playground-body {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 1.5rem;
  padding: 1.5rem;
}

.pg-input-col {
  display: flex;
  flex-direction: column;
}

.pg-label {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.6rem;
}

.pg-textarea {
  width: 100%;
  background: rgba(7, 9, 14, 0.8);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 0.9rem;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--text-primary);
  resize: vertical;
  outline: none;
  transition: border-color var(--transition-fast);
}

.pg-textarea:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 15px rgba(0, 240, 255, 0.2);
}

.pg-preset-prompts {
  margin-top: 0.85rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
}

.preset-title {
  font-size: 0.76rem;
  color: var(--text-muted);
  width: 100%;
}

.preset-chip {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.75rem;
  padding: 0.25rem 0.6rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.preset-chip:hover {
  background: rgba(0, 240, 255, 0.1);
  color: var(--accent-cyan);
  border-color: rgba(0, 240, 255, 0.3);
}

.pg-output-col {
  display: flex;
  flex-direction: column;
  background: rgba(7, 9, 14, 0.9);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.output-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 1rem;
  background: rgba(17, 24, 39, 0.7);
  border-bottom: 1px solid var(--card-border);
}

.output-title {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.btn-copy {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 0.75rem;
  cursor: pointer;
  transition: color var(--transition-fast);
}

.btn-copy:hover {
  color: var(--text-primary);
}

.output-container {
  padding: 1.2rem;
  min-height: 280px;
  max-height: 380px;
  overflow-y: auto;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.55;
  color: #e2e8f0;
}

.placeholder-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  text-align: center;
  color: var(--text-muted);
  padding: 2rem;
}

.placeholder-icon {
  font-size: 2.2rem;
  margin-bottom: 0.8rem;
}

.json-view, .spec-view {
  white-space: pre-wrap;
  word-break: break-word;
}

.spec-header-pill {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  background: rgba(99, 102, 241, 0.2);
  border: 1px solid var(--accent-indigo);
  border-radius: 4px;
  color: #c7d2fe;
  font-size: 0.75rem;
  margin-bottom: 0.5rem;
}

/* ==========================================================================
   ROI & Skill Calculator
   ========================================================================== */
.calculator-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  padding: 2.5rem;
}

.calc-controls {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.control-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

.form-select, .form-input, .form-textarea {
  background: rgba(7, 9, 14, 0.8);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.92rem;
  outline: none;
  transition: border-color var(--transition-fast);
}

.form-select:focus, .form-input:focus, .form-textarea:focus {
  border-color: var(--accent-cyan);
}

.form-range {
  width: 100%;
  height: 6px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  outline: none;
  accent-color: var(--accent-cyan);
  cursor: pointer;
}

.range-markers {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

.calc-results {
  background: rgba(7, 9, 14, 0.6);
  border: 1px solid rgba(0, 240, 255, 0.2);
  border-radius: var(--radius-md);
  padding: 1.8rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.roi-card-header {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-cyan);
  font-weight: 700;
  margin-bottom: 1.2rem;
}

.roi-stats-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.roi-stat-box {
  flex: 1;
  background: rgba(17, 24, 39, 0.6);
  padding: 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--card-border);
  text-align: center;
}

.roi-stat-box.highlight {
  background: rgba(99, 102, 241, 0.15);
  border-color: var(--accent-indigo);
}

.roi-stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.3rem;
}

.roi-stat-val {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 800;
}

.roi-stat-arrow {
  font-size: 1.2rem;
  color: var(--text-muted);
}

.roi-breakdown {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  border-top: 1px solid var(--card-border);
  padding-top: 1.2rem;
}

.breakdown-item {
  display: flex;
  justify-content: space-between;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* ==========================================================================
   Curriculum Section
   ========================================================================== */
.curriculum-filters {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.6rem;
  margin-bottom: 3rem;
}

.filter-btn {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 600;
  padding: 0.5rem 1.2rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn:hover {
  color: var(--text-primary);
  border-color: rgba(255, 255, 255, 0.2);
}

.filter-btn.active {
  background: rgba(0, 240, 255, 0.12);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 1.8rem;
}

.course-card {
  display: flex;
  flex-direction: column;
  padding: 2rem;
  position: relative;
}

.course-card:hover {
  transform: translateY(-6px);
  border-color: var(--card-border-glow);
  box-shadow: 0 16px 35px rgba(0, 240, 255, 0.1);
}

.course-badge-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.2rem;
}

.track-tag {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
}

.tag-cyan { background: rgba(0, 240, 255, 0.15); color: var(--accent-cyan); }
.tag-purple { background: rgba(168, 85, 247, 0.15); color: var(--accent-purple); }
.tag-indigo { background: rgba(99, 102, 241, 0.15); color: #818cf8; }
.tag-pink { background: rgba(236, 72, 153, 0.15); color: var(--accent-pink); }
.tag-green { background: rgba(16, 185, 129, 0.15); color: var(--accent-emerald); }
.tag-yellow { background: rgba(245, 158, 11, 0.15); color: var(--accent-amber); }

.duration-tag {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.course-title {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.8rem;
}

.course-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 1.4rem;
}

.course-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-bottom: 1.8rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  flex-grow: 1;
}

.course-features li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.check-icon {
  color: var(--accent-emerald);
  font-weight: 700;
}

.course-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--card-border);
  padding-top: 1.2rem;
}

.course-level {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.level-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.level-adv { background: var(--accent-pink); }
.level-mid { background: var(--accent-cyan); }
.level-all { background: var(--accent-emerald); }
.level-exec { background: var(--accent-amber); }

/* ==========================================================================
   Comparison Table
   ========================================================================== */
.comparison-table-wrapper {
  overflow-x: auto;
  padding: 1.5rem;
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.92rem;
}

.comparison-table th, .comparison-table td {
  padding: 1.1rem 1.4rem;
  border-bottom: 1px solid var(--card-border);
}

.comparison-table th {
  font-family: var(--font-heading);
  font-size: 1rem;
  color: var(--text-primary);
}

.comparison-table .highlight-col {
  background: rgba(0, 240, 255, 0.04);
  border-left: 1px solid rgba(0, 240, 255, 0.2);
  border-right: 1px solid rgba(0, 240, 255, 0.2);
}

.badge-accent {
  background: rgba(0, 240, 255, 0.15);
  color: var(--accent-cyan);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-weight: 700;
}

/* ==========================================================================
   Cohort Schedule & Timer
   ========================================================================== */
.cohort-banner {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 3rem;
  padding: 3.5rem;
  background: linear-gradient(135deg, rgba(17, 24, 39, 0.8) 0%, rgba(99, 102, 241, 0.15) 100%);
  border: 1px solid rgba(99, 102, 241, 0.3);
}

.cohort-heading {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 0.8rem;
}

.cohort-desc {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-bottom: 1.5rem;
}

.cohort-features-row {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  font-size: 0.9rem;
  color: #c7d2fe;
}

.cohort-timer-box {
  background: rgba(7, 9, 14, 0.75);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 2rem;
  text-align: center;
}

.timer-title {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 1.2rem;
}

.timer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.8rem;
}

.timer-unit {
  background: rgba(17, 24, 39, 0.8);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  padding: 0.8rem 0.4rem;
}

.unit-num {
  display: block;
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--accent-cyan);
}

.unit-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

/* ==========================================================================
   Pricing Section
   ========================================================================== */
.billing-toggle-wrapper {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  background: rgba(17, 24, 39, 0.7);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-full);
  padding: 0.4rem 1rem;
  margin-top: 1.8rem;
}

.billing-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.save-badge {
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-emerald);
  font-size: 0.72rem;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-full);
  margin-left: 0.3rem;
}

.toggle-switch {
  width: 46px;
  height: 24px;
  background: var(--bg-tertiary);
  border: none;
  border-radius: var(--radius-full);
  position: relative;
  cursor: pointer;
  outline: none;
  transition: background var(--transition-fast);
}

.toggle-switch[aria-checked="true"] {
  background: var(--accent-cyan);
}

.toggle-slider {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 20px;
  height: 20px;
  background: #fff;
  border-radius: 50%;
  transition: transform var(--transition-fast);
}

.toggle-switch[aria-checked="true"] .toggle-slider {
  transform: translateX(22px);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.pricing-card {
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  position: relative;
}

.popular-tier {
  border-color: rgba(0, 240, 255, 0.4);
  background: linear-gradient(180deg, rgba(17, 24, 39, 0.85) 0%, rgba(99, 102, 241, 0.15) 100%);
  transform: scale(1.02);
}

.popular-ribbon {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-indigo) 100%);
  color: #07090e;
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  padding: 0.3rem 1rem;
  border-radius: var(--radius-full);
  letter-spacing: 0.05em;
}

.tier-name {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 0.4rem;
}

.tier-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.price-box {
  display: flex;
  align-items: baseline;
  gap: 0.3rem;
  margin-bottom: 1.8rem;
}

.price-box .currency {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-secondary);
}

.price-box .price-amount {
  font-family: var(--font-heading);
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1;
}

.price-box .period {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.tier-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  font-size: 0.9rem;
  margin-bottom: 2.2rem;
  flex-grow: 1;
}

.tier-features li {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.feature-disabled {
  color: var(--text-muted);
  opacity: 0.6;
}

.cross-icon {
  color: var(--accent-red);
}

/* ==========================================================================
   Testimonials
   ========================================================================== */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.8rem;
}

.testimonial-card {
  padding: 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.test-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.2rem;
}

.test-avatar {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-indigo) 0%, var(--accent-purple) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
}

.test-name {
  font-weight: 700;
  font-size: 1rem;
}

.test-role {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.test-quote {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.2rem;
}

.test-rating {
  font-size: 0.85rem;
  color: var(--accent-amber);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.test-verified {
  font-size: 0.75rem;
  color: var(--accent-emerald);
  background: rgba(16, 185, 129, 0.1);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
}

/* ==========================================================================
   FAQ Section
   ========================================================================== */
.faq-container {
  max-width: 840px;
}

.faq-accordion {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  padding: 1.2rem 1.8rem;
  cursor: pointer;
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 700;
  font-size: 1.05rem;
  list-style: none;
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-icon {
  font-size: 1.4rem;
  color: var(--accent-cyan);
  transition: transform var(--transition-fast);
}

.faq-item[open] .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  margin-top: 1rem;
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.65;
}

/* ==========================================================================
   Newsletter Section
   ========================================================================== */
.newsletter-banner {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  align-items: center;
  gap: 2.5rem;
  padding: 3rem;
  background: linear-gradient(135deg, rgba(17, 24, 39, 0.9) 0%, rgba(0, 240, 255, 0.1) 100%);
  border: 1px solid rgba(0, 240, 255, 0.25);
}

.nl-title {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
}

.nl-desc {
  color: var(--text-secondary);
  font-size: 0.92rem;
}

.nl-input-group {
  display: flex;
  gap: 0.5rem;
}

.nl-input {
  flex: 1;
  background: rgba(7, 9, 14, 0.85);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-full);
  padding: 0.75rem 1.4rem;
  color: #fff;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  outline: none;
}

.nl-input:focus {
  border-color: var(--accent-cyan);
}

.form-feedback {
  font-size: 0.85rem;
  margin-top: 0.5rem;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  border-top: 1px solid var(--card-border);
  background: var(--bg-dark);
  padding: 4.5rem 0 2rem;
  position: relative;
  z-index: 1;
}

.footer-container {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3.5rem;
}

.footer-tagline {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-top: 1rem;
  margin-bottom: 1.2rem;
  max-width: 320px;
}

.edge-latency-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.78rem;
  font-family: var(--font-mono);
  color: var(--accent-emerald);
}

.footer-col-title {
  font-size: 0.92rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #fff;
  margin-bottom: 1.2rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.footer-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.88rem;
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--accent-cyan);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 2rem;
}

.footer-bottom-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.footer-socials {
  display: flex;
  gap: 0.8rem;
}

.social-icon {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  transition: all var(--transition-fast);
}

.social-icon:hover {
  background: var(--accent-cyan);
  color: #07090e;
}

/* ==========================================================================
   Modern <dialog> Modal Architecture
   Adheres to Modern Web Guidance:
   - Discrete transition for display/overlay
   - @starting-style
   - Animated backdrop
   - prefers-reduced-motion support
   ========================================================================== */
.modal-dialog {
  margin: auto;
  background: transparent;
  border: none;
  padding: 0;
  max-width: 640px;
  width: 90vw;
  outline: none;

  /* MANDATORY modern web transition behavior */
  opacity: 0;
  transform: scale(0.94) translateY(15px);
  transition-property: opacity, transform, display, overlay;
  transition-duration: 0.28s;
  transition-timing-function: cubic-bezier(0.16, 1, 0.3, 1);
  transition-behavior: allow-discrete;
}

.modal-dialog[open] {
  opacity: 1;
  transform: scale(1) translateY(0);

  @starting-style {
    opacity: 0;
    transform: scale(0.94) translateY(15px);
  }
}

.modal-dialog::backdrop {
  background-color: rgba(0, 0, 0, 0);
  backdrop-filter: blur(0px);
  transition:
    display 0.28s allow-discrete,
    overlay 0.28s allow-discrete,
    background-color 0.28s ease-out,
    backdrop-filter 0.28s ease-out;
}

.modal-dialog[open]::backdrop {
  background-color: rgba(7, 9, 14, 0.82);
  backdrop-filter: blur(10px);

  @starting-style {
    background-color: rgba(0, 0, 0, 0);
    backdrop-filter: blur(0px);
  }
}

.modal-card {
  padding: 2.2rem;
  background: #0f1523;
  border: 1px solid rgba(0, 240, 255, 0.25);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.7);
}

.syllabus-card {
  max-width: 780px;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1.5rem;
}

.modal-title {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 800;
  margin-top: 0.3rem;
}

.modal-close-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--card-border);
  color: var(--text-secondary);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  transition: all var(--transition-fast);
}

.modal-close-btn:hover {
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
}

.modal-form {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.modal-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--card-border);
}

.enroll-guarantee {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.modal-success-view {
  text-align: center;
  padding: 2rem 1rem;
}

.success-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.success-title {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 0.5rem;
}

.success-message {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.success-app-id {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-cyan);
  background: rgba(0, 240, 255, 0.1);
  padding: 0.4rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px dashed rgba(0, 240, 255, 0.3);
}

.syllabus-body {
  max-height: 420px;
  overflow-y: auto;
  padding-right: 0.5rem;
}

.syllabus-week {
  background: rgba(7, 9, 14, 0.7);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  padding: 1rem 1.2rem;
  margin-bottom: 0.8rem;
}

.week-badge {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-cyan);
  text-transform: uppercase;
}

.week-title {
  font-size: 1rem;
  font-weight: 700;
  margin: 0.2rem 0 0.4rem;
}

.week-topics {
  font-size: 0.82rem;
  color: var(--text-secondary);
}

/* Spinner */
.spinner {
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid rgba(0, 0, 0, 0.2);
  border-top-color: #07090e;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.hidden {
  display: none !important;
}

/* Toast Container */
.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  z-index: 1000;
}

.toast {
  background: rgba(17, 24, 39, 0.95);
  backdrop-filter: blur(12px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 0.85rem 1.4rem;
  font-size: 0.88rem;
  color: #fff;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  animation: toast-slide 0.3s ease;
}

.toast-success { border-color: var(--accent-emerald); }
.toast-error { border-color: var(--accent-red); }

@keyframes toast-slide {
  from { transform: translateY(20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Responsive Breakpoints */
@media (max-width: 1024px) {
  .playground-body {
    grid-template-columns: 1fr;
  }
  .calculator-grid {
    grid-template-columns: 1fr;
  }
  .cohort-banner {
    grid-template-columns: 1fr;
    padding: 2.5rem;
  }
  .newsletter-banner {
    grid-template-columns: 1fr;
  }
  .footer-container {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background: rgba(7, 9, 14, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 2rem;
    gap: 1.5rem;
    border-bottom: 1px solid var(--card-border);
    transform: translateY(-150%);
    transition: transform var(--transition-normal);
  }

  .nav-menu.open {
    transform: translateY(0);
  }

  .mobile-toggle {
    display: flex;
  }

  .hero-metrics {
    flex-direction: column;
    gap: 1.2rem;
    padding: 1.5rem;
  }

  .metric-divider {
    width: 80%;
    height: 1px;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .footer-container {
    grid-template-columns: 1fr;
  }

  .footer-bottom-container {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
}