/* ==========================================================================
   YZ101.tr Design System & Core Styles
   Modern, High-Performance, Futuristic Educational Tech Platform
   ========================================================================== */

/* --- CSS Variables & Design Tokens --- */
:root {
  /* Color Palette: Deep Slate + Cyber Accents */
  --bg-main: #0A0E17;
  --bg-surface: #111827;
  --bg-surface-elevated: #162032;
  --bg-surface-card: rgba(17, 24, 39, 0.75);
  --bg-glass: rgba(22, 32, 50, 0.65);
  
  /* Text Colors */
  --text-primary: #F8FAFC;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  --text-inverse: #0A0E17;
  
  /* Accent Colors */
  --accent-cyan: #00F2FE;
  --accent-cyan-hover: #38F8FF;
  --accent-cyan-dim: rgba(0, 242, 254, 0.12);
  
  --accent-emerald: #10B981;
  --accent-emerald-dim: rgba(16, 185, 129, 0.12);
  
  --accent-indigo: #6366F1;
  --accent-indigo-dim: rgba(99, 102, 241, 0.15);
  
  --accent-amber: #F59E0B;
  --accent-amber-dim: rgba(245, 158, 11, 0.12);

  /* Borders & Dividers */
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(0, 242, 254, 0.5);
  --border-glow: rgba(0, 242, 254, 0.2);

  /* Shadows & Blurs */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.6);
  --shadow-cyan-glow: 0 0 25px rgba(0, 242, 254, 0.25);
  
  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-heading: 'Plus Jakarta Sans', var(--font-sans);
  --font-mono: 'Fira Code', monospace;

  /* Layout & Spacing */
  --container-max: 1240px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;
  --transition-fast: 0.18s ease;
  --transition-normal: 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  color-scheme: dark;
}

body {
  background-color: var(--bg-main);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

::selection {
  background-color: var(--accent-cyan);
  color: var(--bg-main);
}

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

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

/* --- Layout Containers --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.section-padding {
  padding-top: 5.5rem;
  padding-bottom: 5.5rem;
}

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

.text-highlight {
  color: var(--accent-cyan);
  position: relative;
  display: inline-block;
}

.hidden-mobile {
  display: inline;
}

/* --- Badges & Micro Labels --- */
.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-cyan);
  background: var(--accent-cyan-dim);
  border: 1px solid rgba(0, 242, 254, 0.25);
  padding: 0.35rem 0.9rem;
  border-radius: var(--radius-full);
  margin-bottom: 1rem;
}

.section-title {
  font-family: var(--font-heading);
  font-size: 2.35rem;
  font-weight: 800;
  line-height: 1.22;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-bottom: 0.9rem;
}

.section-subtitle {
  font-size: 1.08rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.6;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background-color: var(--accent-emerald);
  border-radius: 50%;
  display: inline-block;
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  animation: pulse-ring 1.8s infinite;
}

@keyframes pulse-ring {
  0% {
    transform: scale(0.95);
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  }
  70% {
    transform: scale(1);
    box-shadow: 0 0 0 6px rgba(16, 185, 129, 0);
  }
  100% {
    transform: scale(0.95);
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0);
  }
}

/* --- Buttons System --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.65rem 1.35rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, #00F2FE 0%, #06B6D4 100%);
  color: #0A0E17;
  box-shadow: 0 4px 14px rgba(0, 242, 254, 0.3);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #38F8FF 0%, #0891B2 100%);
  box-shadow: var(--shadow-cyan-glow);
  transform: translateY(-1px);
}

.btn-secondary-outline {
  background: rgba(255, 255, 255, 0.03);
  border-color: var(--border-subtle);
  color: var(--text-primary);
}

.btn-secondary-outline:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.btn-secondary-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid transparent;
}

.btn-secondary-ghost:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--text-primary);
  color: var(--text-primary);
}

.btn-lg {
  padding: 0.85rem 1.75rem;
  font-size: 1.05rem;
  border-radius: var(--radius-md);
}

.btn-sm {
  padding: 0.45rem 0.95rem;
  font-size: 0.85rem;
}

.btn-block {
  width: 100%;
}

/* --- Announcement Bar --- */
.announcement-bar {
  background: linear-gradient(90deg, #111827 0%, #162032 50%, #111827 100%);
  border-bottom: 1px solid var(--border-subtle);
  font-size: 0.86rem;
  padding: 0.45rem 0;
  position: relative;
  z-index: 60;
}

.announcement-content {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  position: relative;
}

.announcement-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-emerald);
  padding: 0.15rem 0.6rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.75rem;
}

.announcement-text {
  color: var(--text-secondary);
}

.promo-code {
  background: rgba(0, 242, 254, 0.1);
  color: var(--accent-cyan);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-weight: 600;
}

.announcement-close {
  position: absolute;
  right: 1.5rem;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.2rem;
  cursor: pointer;
  line-height: 1;
}

.announcement-close:hover {
  color: var(--text-primary);
}

/* --- Site Header --- */
.site-header {
  position: sticky;
  top: 0;
  width: 100%;
  background: rgba(10, 14, 23, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 50;
  transition: all var(--transition-fast);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

/* Brand Logo */
.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-icon-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
}

.logo-icon {
  width: 38px;
  height: 38px;
}

.logo-text-group {
  display: flex;
  flex-direction: column;
}

.logo-title {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  line-height: 1.1;
}

.logo-title span {
  color: var(--accent-cyan);
}

.domain-badge {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-emerald) !important;
  margin-left: 2px;
}

.logo-subtitle {
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

/* Desktop Nav */
.desktop-nav .nav-list {
  display: flex;
  align-items: center;
  gap: 1.8rem;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.mobile-menu-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border-subtle);
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  flex-direction: column;
  gap: 4px;
}

.mobile-menu-toggle .bar {
  width: 20px;
  height: 2px;
  background-color: var(--text-primary);
  transition: var(--transition-fast);
}

.mobile-drawer {
  display: none;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  padding: 1.5rem;
}

.mobile-drawer.active {
  display: block;
}

.mobile-nav {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.mobile-nav-link {
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 0.5rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.mobile-drawer-cta {
  margin-top: 1rem;
}

/* --- Hero Section --- */
.hero-section {
  position: relative;
  padding: 5rem 0 4rem;
  overflow: hidden;
}

.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  pointer-events: none;
  z-index: 0;
}

.hero-glow-1 {
  width: 500px;
  height: 500px;
  background: rgba(0, 242, 254, 0.08);
  top: -100px;
  right: -50px;
}

.hero-glow-2 {
  width: 450px;
  height: 450px;
  background: rgba(99, 102, 241, 0.08);
  bottom: -50px;
  left: -100px;
}

.hero-container {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 3.5rem;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent-cyan);
  background: var(--accent-cyan-dim);
  border: 1px solid rgba(0, 242, 254, 0.25);
  padding: 0.35rem 0.95rem;
  border-radius: var(--radius-full);
  margin-bottom: 1.4rem;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
}

.hero-description {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 2rem;
  max-width: 620px;
}

.hero-description strong {
  color: var(--text-primary);
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}

.hero-metrics {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding-top: 1.8rem;
  border-top: 1px solid var(--border-subtle);
}

.metric-card {
  display: flex;
  flex-direction: column;
}

.metric-number {
  font-family: var(--font-heading);
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.1;
}

.metric-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-top: 3px;
}

.metric-divider {
  width: 1px;
  height: 32px;
  background-color: var(--border-subtle);
}

/* Hero Terminal Box */
.terminal-card {
  background: #0D131F;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg), 0 0 30px rgba(0, 242, 254, 0.08);
}

.terminal-header {
  background: #111827;
  padding: 0.75rem 1.1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-subtle);
}

.terminal-dots {
  display: flex;
  align-items: center;
  gap: 6px;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.dot-red { background: #EF4444; }
.dot-yellow { background: #F59E0B; }
.dot-green { background: #10B981; }

.terminal-title {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-muted);
}

.terminal-badge {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--accent-emerald);
  background: var(--accent-emerald-dim);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
}

.terminal-body {
  padding: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.terminal-line {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.t-prompt { color: var(--accent-cyan); font-weight: 600; }
.t-cmd { color: var(--text-primary); }
.t-response { color: var(--text-secondary); padding-left: 0.5rem; font-size: 0.8rem; }
.t-arrow { color: var(--text-muted); }
.t-done { color: var(--accent-emerald); font-weight: 600; }
.t-active { color: var(--accent-cyan); font-weight: 600; animation: blink 1.2s infinite; }
.t-waiting { color: var(--text-muted); }

@keyframes blink {
  50% { opacity: 0.4; }
}

.terminal-code-box {
  background: #080C14;
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-sm);
  padding: 0.85rem;
  margin-top: 0.4rem;
  font-size: 0.78rem;
  line-height: 1.5;
}

.code-comment { color: var(--text-muted); font-style: italic; margin-bottom: 4px; }
.code-kw { color: #F43F5E; }
.code-cls { color: #38BDF8; }
.code-str { color: #34D399; }
.code-fn { color: #FBBF24; }

.terminal-footer {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.74rem;
  color: var(--text-muted);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 0.75rem;
  margin-top: 0.4rem;
}

.pulse-indicator {
  position: relative;
  width: 8px;
  height: 8px;
}

.pulse-core {
  position: absolute;
  width: 8px;
  height: 8px;
  background: var(--accent-emerald);
  border-radius: 50%;
}

/* --- Ticker / Tools Grid --- */
.tools-ticker-section {
  padding: 2.2rem 0;
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  background: rgba(17, 24, 39, 0.4);
}

.ticker-title {
  text-align: center;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.tools-grid {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.85rem;
  flex-wrap: wrap;
}

.tool-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius-full);
  font-size: 0.84rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.tool-pill:hover {
  border-color: var(--accent-cyan);
  color: var(--text-primary);
  transform: translateY(-2px);
}

/* --- Course Filter & Cards --- */
.course-filters {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  margin: 2.5rem 0 3rem;
  flex-wrap: wrap;
}

.filter-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.88rem;
  padding: 0.55rem 1.2rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.filter-btn.active {
  background: var(--accent-cyan-dim);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.8rem;
}

.course-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.8rem;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.course-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 242, 254, 0.35);
  box-shadow: var(--shadow-md);
}

.course-badge {
  position: absolute;
  top: 1.2rem;
  right: 1.2rem;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.2rem 0.65rem;
  border-radius: var(--radius-full);
}

.badge-popular { background: rgba(0, 242, 254, 0.15); color: var(--accent-cyan); border: 1px solid rgba(0, 242, 254, 0.3); }
.badge-featured { background: rgba(16, 185, 129, 0.15); color: var(--accent-emerald); border: 1px solid rgba(16, 185, 129, 0.3); }
.badge-pro { background: rgba(99, 102, 241, 0.15); color: #818CF8; border: 1px solid rgba(99, 102, 241, 0.3); }
.badge-b2b { background: rgba(245, 158, 11, 0.15); color: var(--accent-amber); border: 1px solid rgba(245, 158, 11, 0.3); }

.course-level-tag {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  margin-bottom: 0.6rem;
}

.level-temel { color: var(--accent-cyan); }
.level-orta { color: var(--accent-emerald); }
.level-ileri { color: #818CF8; }
.level-kurumsal { color: var(--accent-amber); }

.course-title {
  font-family: var(--font-heading);
  font-size: 1.32rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.75rem;
}

.course-summary {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 1.4rem;
}

.course-features {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  padding: 1rem 0;
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 1.25rem;
}

.cf-item {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 0.83rem;
  color: var(--text-secondary);
}

.course-curriculum-preview {
  margin-bottom: 1.5rem;
}

.preview-title {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-primary);
  display: block;
  margin-bottom: 0.5rem;
}

.preview-list {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.preview-list li {
  font-size: 0.82rem;
  color: var(--text-muted);
  position: relative;
  padding-left: 1.1rem;
  line-height: 1.4;
}

.preview-list li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--accent-cyan);
}

.course-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1.2rem;
  border-top: 1px solid var(--border-subtle);
  gap: 0.75rem;
  flex-wrap: wrap;
}

.price-box {
  display: flex;
  flex-direction: column;
}

.price-original {
  font-size: 0.78rem;
  color: var(--text-muted);
  text-decoration: line-through;
}

.price-current {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
}

.price-current small {
  font-size: 0.7rem;
  color: var(--text-muted);
  font-weight: 500;
}

.price-label {
  font-size: 0.75rem;
  color: var(--text-muted);
}

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

/* --- Interactive Quiz Section --- */
.quiz-section {
  background: linear-gradient(180deg, var(--bg-main) 0%, #0F172A 100%);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.quiz-wrapper {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 3.5rem;
  align-items: center;
}

.quiz-title {
  font-family: var(--font-heading);
  font-size: 2.1rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 1rem;
}

.quiz-description {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.6;
  margin-bottom: 1.8rem;
}

.quiz-meta-info {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.quiz-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.2rem;
  box-shadow: var(--shadow-lg);
  position: relative;
}

.quiz-progress-bar {
  width: 100%;
  height: 6px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: 1rem;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-emerald));
  transition: width 0.3s ease;
}

.quiz-steps-header {
  display: flex;
  justify-content: space-between;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.quiz-question-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 1.3rem;
  color: var(--text-primary);
}

.quiz-options-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.quiz-option-card {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1rem 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: all var(--transition-fast);
}

.quiz-option-card:hover {
  border-color: rgba(0, 242, 254, 0.4);
  background: rgba(0, 242, 254, 0.04);
}

.quiz-option-card.selected {
  border-color: var(--accent-cyan);
  background: var(--accent-cyan-dim);
}

.quiz-option-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.quiz-option-icon {
  font-size: 1.2rem;
}

.quiz-option-text h4 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 2px;
}

.quiz-option-text p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.quiz-radio {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
}

.quiz-option-card.selected .quiz-radio {
  border-color: var(--accent-cyan);
}

.quiz-option-card.selected .quiz-radio::after {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-cyan);
}

.quiz-footer-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 1.8rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--border-subtle);
}

/* Quiz Result Card */
.quiz-result-box {
  text-align: center;
  padding: 1rem 0;
}

.result-badge {
  display: inline-flex;
  padding: 0.35rem 0.9rem;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 700;
  background: var(--accent-emerald-dim);
  color: var(--accent-emerald);
  margin-bottom: 1rem;
}

.result-title {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
}

.result-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

.result-recommendation {
  background: var(--bg-surface-elevated);
  border: 1px solid rgba(0, 242, 254, 0.3);
  border-radius: var(--radius-md);
  padding: 1.2rem;
  margin-bottom: 1.5rem;
  text-align: left;
}

.rec-title {
  font-weight: 700;
  color: var(--accent-cyan);
  font-size: 1.05rem;
  margin-bottom: 0.4rem;
}

.rec-text {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* --- Prompt Lab Section --- */
.prompt-lab-section {
  background: var(--bg-main);
}

.lab-container {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 2rem;
  margin-top: 2.5rem;
}

.lab-controls {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.8rem;
  display: flex;
  flex-direction: column;
  gap: 1.3rem;
}

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

.lab-label {
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--text-primary);
}

.lab-select {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  padding: 0.65rem 0.85rem;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  cursor: pointer;
  transition: border-color var(--transition-fast);
}

.lab-select:focus {
  outline: none;
  border-color: var(--accent-cyan);
}

.lab-output-panel {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.output-block {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.output-header {
  background: var(--bg-surface-elevated);
  padding: 0.75rem 1.2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-subtle);
}

.output-title {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.btn-copy-sm {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.76rem;
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-copy-sm:hover {
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
}

.code-preview {
  padding: 1.2rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: #E2E8F0;
  line-height: 1.55;
  white-space: pre-wrap;
  background: #090D15;
}

.response-preview-block {
  border-color: rgba(0, 242, 254, 0.2);
}

.output-status {
  font-size: 0.75rem;
  color: var(--accent-emerald);
  display: flex;
  align-items: center;
  gap: 4px;
  font-weight: 600;
}

.simulated-ai-response {
  padding: 1.4rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  background: #0B101C;
  min-height: 160px;
}

.simulated-ai-response h4 {
  color: var(--text-primary);
  font-size: 1rem;
  margin: 0.8rem 0 0.4rem;
}

.simulated-ai-response ul {
  list-style: disc;
  margin-left: 1.2rem;
  margin-bottom: 0.8rem;
}

.simulated-ai-response li {
  margin-bottom: 0.3rem;
}

.simulated-ai-response table {
  width: 100%;
  border-collapse: collapse;
  margin: 0.8rem 0;
  font-size: 0.82rem;
}

.simulated-ai-response th, .simulated-ai-response td {
  border: 1px solid var(--border-subtle);
  padding: 0.45rem 0.7rem;
  text-align: left;
}

.simulated-ai-response th {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
}

/* --- Roadmap Section --- */
.roadmap-section {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.roadmap-timeline {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  margin-top: 3.5rem;
  position: relative;
}

.timeline-card {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem 1.5rem;
  position: relative;
  transition: all var(--transition-normal);
}

.timeline-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 242, 254, 0.3);
}

.timeline-step-num {
  font-family: var(--font-heading);
  font-size: 2.8rem;
  font-weight: 900;
  color: rgba(255, 255, 255, 0.06);
  position: absolute;
  top: 1rem;
  right: 1.2rem;
  line-height: 1;
}

.timeline-tag {
  font-size: 0.74rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--accent-cyan);
  margin-bottom: 0.5rem;
}

.timeline-title {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  line-height: 1.3;
}

.timeline-desc {
  font-size: 0.86rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 1.3rem;
}

.timeline-skills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.timeline-skills span {
  font-size: 0.74rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.06);
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
  color: var(--text-muted);
}

/* --- Corporate Section --- */
.corporate-section {
  background: var(--bg-main);
}

.corporate-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3.5rem;
  align-items: center;
}

.corporate-description {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 2rem;
}

.corporate-benefits-list {
  display: flex;
  flex-direction: column;
  gap: 1.4rem;
}

.cb-item {
  display: flex;
  gap: 1.1rem;
  align-items: flex-start;
}

.cb-icon {
  font-size: 1.5rem;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  width: 46px;
  height: 46px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  flex-shrink: 0;
}

.cb-info h4 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.cb-info p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.corporate-form-card {
  background: var(--bg-surface);
  border: 1px solid rgba(245, 158, 11, 0.25);
  border-radius: var(--radius-lg);
  padding: 2.2rem;
  box-shadow: var(--shadow-lg);
}

.form-header {
  margin-bottom: 1.5rem;
}

.form-header h3 {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.form-header p {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

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

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.form-group label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.form-input {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  padding: 0.65rem 0.9rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  transition: border-color var(--transition-fast);
}

.form-input:focus {
  outline: none;
  border-color: var(--accent-cyan);
}

.text-uppercase {
  text-transform: uppercase;
}

.form-checkbox-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 1rem 0 1.5rem;
}

.form-checkbox-group input {
  cursor: pointer;
}

.text-link {
  color: var(--accent-cyan);
  text-decoration: underline;
}

/* --- Instructors Section --- */
.instructors-section {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
}

.instructors-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.instructor-card {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem;
  text-align: center;
  transition: all var(--transition-normal);
}

.instructor-card:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 255, 255, 0.2);
}

.instructor-avatar-box {
  position: relative;
  width: 90px;
  height: 90px;
  margin: 0 auto 1.2rem;
}

.avatar-placeholder {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 800;
  color: #fff;
  border: 2px solid var(--border-subtle);
}

.avatar-1 { background: linear-gradient(135deg, #00F2FE, #4F46E5); }
.avatar-2 { background: linear-gradient(135deg, #10B981, #0284C7); }
.avatar-3 { background: linear-gradient(135deg, #F59E0B, #EC4899); }

.instructor-status-tag {
  position: absolute;
  bottom: -4px;
  left: 50%;
  transform: translateX(-50%);
  background: #0A0E17;
  border: 1px solid var(--border-subtle);
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--accent-cyan);
  padding: 0.1rem 0.55rem;
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.instructor-name {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.2rem;
}

.instructor-role {
  font-size: 0.84rem;
  color: var(--accent-cyan);
  font-weight: 500;
  margin-bottom: 0.9rem;
}

.instructor-bio {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 1.2rem;
}

.instructor-tags {
  display: flex;
  justify-content: center;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.instructor-tags span {
  font-size: 0.72rem;
  background: rgba(255, 255, 255, 0.04);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  color: var(--text-muted);
}

/* --- Testimonials Section --- */
.testimonials-section {
  background: var(--bg-main);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.8rem;
  margin-top: 3rem;
}

.testimonial-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.8rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.stars {
  color: #FBBF24;
  font-size: 1rem;
  margin-bottom: 0.8rem;
}

.testimonial-text {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.4rem;
  font-style: italic;
}

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

.student-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--accent-cyan);
}

.student-name {
  display: block;
  font-size: 0.9rem;
  color: var(--text-primary);
}

.student-title {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* --- FAQ Section --- */
.faq-section {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
}

.faq-container {
  max-width: 860px;
}

.faq-accordion {
  margin-top: 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.faq-item {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item.active {
  border-color: rgba(0, 242, 254, 0.3);
}

.faq-question {
  width: 100%;
  padding: 1.2rem 1.4rem;
  background: transparent;
  border: none;
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-family: var(--font-heading);
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--text-primary);
}

.faq-icon {
  color: var(--text-muted);
  transition: transform var(--transition-fast);
  flex-shrink: 0;
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
  color: var(--accent-cyan);
}

.faq-answer {
  display: none;
  padding: 0 1.4rem 1.2rem;
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.faq-item.active .faq-answer {
  display: block;
}

/* --- Final CTA Section --- */
.final-cta-section {
  padding: 5rem 0;
  background: var(--bg-main);
}

.cta-card {
  background: linear-gradient(135deg, #111827 0%, #1E293B 100%);
  border: 1px solid rgba(0, 242, 254, 0.25);
  border-radius: var(--radius-lg);
  padding: 4rem 2rem;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-lg), var(--shadow-cyan-glow);
}

.cta-glow {
  position: absolute;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(0, 242, 254, 0.15) 0%, transparent 70%);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.cta-content {
  position: relative;
  z-index: 1;
  max-width: 650px;
  margin: 0 auto;
}

.cta-title {
  font-family: var(--font-heading);
  font-size: 2.3rem;
  font-weight: 800;
  margin-bottom: 1rem;
}

.cta-description {
  font-size: 1.08rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 2.2rem;
}

.cta-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

/* --- Site Footer --- */
.site-footer {
  background: #070A10;
  border-top: 1px solid var(--border-subtle);
  padding: 4.5rem 0 2rem;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.2fr 2fr;
  gap: 4rem;
  margin-bottom: 3.5rem;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-tagline {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 320px;
}

.footer-contact-info {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.footer-links-group {
  display: grid;
  grid-template-columns: 1fr 1fr 1.3fr;
  gap: 2rem;
}

.footer-heading {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1.1rem;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.footer-col a {
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

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

.newsletter-desc {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 0.8rem;
}

.newsletter-form {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.newsletter-input {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  padding: 0.55rem 0.85rem;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  flex: 1;
}

.newsletter-input:focus {
  outline: none;
  border-color: var(--accent-cyan);
}

.newsletter-btn {
  background: var(--accent-cyan);
  color: #0A0E17;
  border: none;
  padding: 0.55rem 0.9rem;
  border-radius: var(--radius-md);
  font-weight: 700;
  cursor: pointer;
  transition: opacity var(--transition-fast);
}

.newsletter-btn:hover {
  opacity: 0.9;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.8rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-legal {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.legal-link:hover {
  color: var(--text-secondary);
}

/* --- Modals / Dialogs System --- */
.app-modal {
  border: none;
  background: transparent;
  padding: 0;
  max-width: 100vw;
  max-height: 100vh;
}

.app-modal::backdrop {
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(6px);
}

.modal-card {
  background: var(--bg-surface);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-lg);
  max-width: 680px;
  width: 90vw;
  margin: auto;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  animation: modal-appear 0.22s ease-out;
}

@keyframes modal-appear {
  from {
    opacity: 0;
    transform: scale(0.96) translateY(10px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.enroll-card {
  max-width: 580px;
}

.modal-header {
  padding: 1.5rem 1.8rem;
  background: var(--bg-surface-elevated);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
}

.modal-badge {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--accent-cyan);
  margin-bottom: 0.3rem;
  display: block;
}

.modal-title {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 800;
}

.modal-subtitle {
  font-size: 0.84rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

.modal-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.6rem;
  cursor: pointer;
  line-height: 1;
  padding: 0;
}

.modal-close:hover {
  color: var(--text-primary);
}

.modal-body {
  padding: 1.8rem;
  max-height: 65vh;
  overflow-y: auto;
}

.modal-footer {
  padding: 1.2rem 1.8rem;
  background: var(--bg-surface-elevated);
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-price {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-primary);
}

.modal-actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

/* Modal Curriculum Content */
.curriculum-module {
  margin-bottom: 1.3rem;
  padding-bottom: 1.3rem;
  border-bottom: 1px solid var(--border-subtle);
}

.module-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.6rem;
}

.module-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.module-duration {
  font-size: 0.75rem;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.05);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
}

.module-topics {
  list-style: disc;
  margin-left: 1.2rem;
  font-size: 0.86rem;
  color: var(--text-secondary);
}

.module-topics li {
  margin-bottom: 0.35rem;
}

/* --- Toast Notification --- */
.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  z-index: 100;
}

.toast {
  background: #111827;
  border: 1px solid var(--border-subtle);
  border-left: 4px solid var(--accent-cyan);
  border-radius: var(--radius-md);
  padding: 0.9rem 1.2rem;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.88rem;
  color: var(--text-primary);
  min-width: 280px;
  animation: toast-in 0.25s ease-out;
}

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

@keyframes toast-in {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}