/* ═════════════════════════════════════════════════════════════════════════════
   Vacanam — Landing Page Design System
   Modern Windows 11 Fluent + Glassmorphism Dark Theme
   ═════════════════════════════════════════════════════════════════════════════ */

:root {
  /* Color Palette */
  --bg-primary: #090D16;
  --bg-secondary: #0F172A;
  --bg-card: rgba(30, 41, 59, 0.7);
  --bg-card-hover: rgba(51, 65, 85, 0.8);
  --bg-glass: rgba(15, 23, 42, 0.75);
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(99, 102, 241, 0.5);
  --border-glow: rgba(139, 92, 246, 0.3);
  
  --text-primary: #F8FAFC;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  --text-accent: #818CF8;
  
  --brand-primary: #6366F1;
  --brand-secondary: #8B5CF6;
  --brand-gradient: linear-gradient(135deg, #6366F1 0%, #8B5CF6 50%, #EC4899 100%);
  --brand-glow: 0 0 25px rgba(99, 102, 241, 0.45);
  
  --success: #10B981;
  --warning: #F59E0B;
  --info: #38BDF8;
  
  --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Cascadia Code', Consolas, monospace;
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 20px 40px -15px rgba(0, 0, 0, 0.7);
  --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.25);
  
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  color-scheme: dark;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  -webkit-font-smoothing: antialiased;
}

/* Background Glowing Mesh */
.bg-mesh {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: -1;
  pointer-events: none;
  background: 
    radial-gradient(circle at 15% 15%, rgba(99, 102, 241, 0.15) 0%, transparent 40%),
    radial-gradient(circle at 85% 25%, rgba(139, 92, 246, 0.12) 0%, transparent 45%),
    radial-gradient(circle at 50% 80%, rgba(236, 72, 153, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 75% 90%, rgba(16, 185, 129, 0.08) 0%, transparent 40%);
  background-attachment: fixed;
}

.bg-grid {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 40px 40px;
  z-index: -1;
  pointer-events: none;
}

/* ── Typography & Helpers ────────────────────────────────────────────────── */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: #FFFFFF;
}

p {
  color: var(--text-secondary);
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.gradient-text {
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-accent);
  letter-spacing: 0.3px;
}

.badge.pulse::before {
  content: '';
  width: 8px;
  height: 8px;
  background: var(--success);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--success);
  animation: pulse-dot 2s infinite;
}

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

/* ── Header & Navigation ─────────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  background: rgba(9, 13, 22, 0.85);
  border-bottom: 1px solid var(--border-subtle);
  transition: all var(--transition-normal);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.brand-logo svg {
  width: 34px;
  height: 34px;
  filter: drop-shadow(0 0 12px rgba(99, 102, 241, 0.6));
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.nav-links a:hover {
  color: #FFFFFF;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* ── Buttons ─────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: var(--brand-gradient);
  color: #FFFFFF;
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
  position: relative;
  overflow: hidden;
}

.btn-primary:hover {
  box-shadow: 0 6px 28px rgba(99, 102, 241, 0.65);
  transform: translateY(-2px);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 16px 32px;
  font-size: 1.05rem;
  border-radius: var(--radius-md);
}

.btn-glow {
  animation: glow-pulse 3s infinite alternate;
}

@keyframes glow-pulse {
  0% { box-shadow: 0 0 20px rgba(99, 102, 241, 0.3); }
  100% { box-shadow: 0 0 35px rgba(139, 92, 246, 0.6); }
}

/* ── Hero Section ────────────────────────────────────────────────────────── */
.hero-section {
  padding: 90px 0 60px;
  text-align: center;
  position: relative;
}

.hero-content {
  max-width: 860px;
  margin: 0 auto;
}

.hero-title {
  font-size: clamp(2.5rem, 5.5vw, 4.2rem);
  letter-spacing: -1.5px;
  margin: 24px 0 20px;
  font-weight: 800;
}

.hero-subtitle {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  color: var(--text-secondary);
  margin-bottom: 36px;
  line-height: 1.6;
}

.hero-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.hero-shortcut-hint {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-muted);
  background: rgba(15, 23, 42, 0.6);
  padding: 8px 18px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-subtle);
}

.key-badge {
  display: inline-block;
  padding: 2px 8px;
  background: #1E293B;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-bottom: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: #F1F5F9;
  font-weight: 600;
}

/* Hero Visual Showcase */
.hero-visual {
  margin-top: 60px;
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-focus);
  box-shadow: 0 25px 60px -15px rgba(0, 0, 0, 0.8), var(--brand-glow);
}

.hero-visual img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform var(--transition-slow);
}

.hero-visual:hover img {
  transform: scale(1.015);
}

/* ── Interactive Push-to-Talk Simulator ──────────────────────────────────── */
.playground-section {
  padding: 80px 0;
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 50px;
}

.section-title {
  font-size: clamp(2rem, 3.5vw, 2.8rem);
  letter-spacing: -0.8px;
  margin-top: 12px;
}

.section-desc {
  font-size: 1.1rem;
  margin-top: 12px;
}

.simulator-container {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 36px;
  max-width: 960px;
  margin: 0 auto;
  box-shadow: var(--shadow-lg);
  position: relative;
}

.simulator-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 28px;
  flex-wrap: wrap;
  gap: 16px;
}

.target-app-selector {
  display: flex;
  align-items: center;
  gap: 10px;
}

.app-chip {
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  color: var(--text-secondary);
}

.app-chip.active {
  background: rgba(99, 102, 241, 0.2);
  border-color: var(--brand-primary);
  color: #FFFFFF;
  font-weight: 600;
}

.simulator-controls {
  display: flex;
  align-items: center;
  gap: 12px;
}

.ptt-interactive-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  width: 100%;
  padding: 20px;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.15) 0%, rgba(139, 92, 246, 0.15) 100%);
  border: 2px dashed rgba(99, 102, 241, 0.4);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
  user-select: none;
  -webkit-user-select: none;
}

.ptt-interactive-btn:hover {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.25) 0%, rgba(139, 92, 246, 0.25) 100%);
  border-color: var(--brand-primary);
}

.ptt-interactive-btn.recording {
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.25) 0%, rgba(220, 38, 38, 0.35) 100%);
  border-color: #EF4444;
  border-style: solid;
  box-shadow: 0 0 30px rgba(239, 68, 68, 0.4);
  animation: pulse-recording 1.5s infinite;
}

@keyframes pulse-recording {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(0.99); }
}

.canvas-waveform {
  width: 100%;
  height: 64px;
  border-radius: var(--radius-sm);
  background: #0B0F19;
  margin: 20px 0;
  display: block;
}

.editor-mockup {
  background: #0B0F19;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  padding: 24px;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  min-height: 180px;
  position: relative;
  line-height: 1.7;
}

.editor-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.typing-text {
  color: #F8FAFC;
  white-space: pre-wrap;
}

.cursor-blink {
  display: inline-block;
  width: 8px;
  height: 18px;
  background: var(--brand-primary);
  vertical-align: middle;
  margin-left: 2px;
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

/* ── Features Grid ───────────────────────────────────────────────────────── */
.features-section {
  padding: 90px 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-focus);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-md), var(--shadow-glow);
}

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(99, 102, 241, 0.15);
  border: 1px solid rgba(99, 102, 241, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 20px;
}

.feature-title {
  font-size: 1.25rem;
  margin-bottom: 10px;
}

.feature-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* ── Model Matrix & Calculator ───────────────────────────────────────────── */
.models-section {
  padding: 90px 0;
}

.models-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.model-card {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-normal);
  position: relative;
}

.model-card.recommended {
  border-color: var(--brand-primary);
  box-shadow: 0 0 30px rgba(99, 102, 241, 0.25);
  background: rgba(30, 41, 59, 0.85);
}

.model-card.recommended::before {
  content: 'RECOMMENDED';
  position: absolute;
  top: -12px;
  right: 20px;
  background: var(--brand-gradient);
  color: white;
  font-size: 0.7rem;
  font-weight: 800;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  letter-spacing: 0.5px;
}

.model-header {
  margin-bottom: 16px;
}

.model-name {
  font-size: 1.3rem;
  margin-bottom: 4px;
}

.model-size-badge {
  font-size: 0.85rem;
  font-family: var(--font-mono);
  color: var(--text-accent);
}

.model-stats {
  list-style: none;
  margin: 20px 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.model-stats li {
  display: flex;
  justify-content: space-between;
  font-size: 0.9rem;
  color: var(--text-secondary);
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  padding-bottom: 8px;
}

.model-stats li strong {
  color: var(--text-primary);
}

/* ── Supported Languages Section ─────────────────────────────────────────── */
.languages-section {
  padding: 90px 0;
}

.lang-search-bar {
  max-width: 500px;
  margin: 0 auto 36px;
  position: relative;
}

.lang-search-input {
  width: 100%;
  padding: 14px 20px 14px 44px;
  border-radius: var(--radius-full);
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid var(--border-subtle);
  color: #FFFFFF;
  font-size: 1rem;
  outline: none;
  transition: all var(--transition-fast);
}

.lang-search-input:focus {
  border-color: var(--brand-primary);
  box-shadow: 0 0 20px rgba(99, 102, 241, 0.3);
}

.lang-search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
}

.languages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 12px;
  max-height: 480px;
  overflow-y: auto;
  padding: 10px;
  background: rgba(15, 23, 42, 0.5);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
}

/* Custom Scrollbar */
.languages-grid::-webkit-scrollbar {
  width: 6px;
}
.languages-grid::-webkit-scrollbar-track {
  background: transparent;
}
.languages-grid::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 4px;
}

.lang-card {
  background: rgba(30, 41, 59, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.9rem;
  transition: all var(--transition-fast);
}

.lang-card:hover {
  background: rgba(99, 102, 241, 0.15);
  border-color: rgba(99, 102, 241, 0.4);
}

.lang-code {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 2px 6px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 4px;
  color: var(--text-accent);
}

/* ── Architecture Pipeline ───────────────────────────────────────────────── */
.arch-section {
  padding: 90px 0;
}

.pipeline-diagram {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 860px;
  margin: 0 auto;
}

.pipeline-step {
  display: flex;
  align-items: center;
  gap: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px 28px;
  transition: all var(--transition-normal);
}

.pipeline-step:hover {
  border-color: var(--border-focus);
  transform: translateX(6px);
}

.step-num {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--brand-gradient);
  color: white;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.step-info h4 {
  font-size: 1.1rem;
  margin-bottom: 4px;
}

.step-info p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* ── FAQ Section ─────────────────────────────────────────────────────────── */
.faq-section {
  padding: 90px 0;
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition-normal);
}

.faq-question {
  padding: 20px 24px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 600;
  font-size: 1.05rem;
}

.faq-question::after {
  content: '+';
  font-size: 1.4rem;
  color: var(--text-accent);
  transition: transform var(--transition-normal);
}

.faq-item.active .faq-question::after {
  content: '−';
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal), padding var(--transition-normal);
  padding: 0 24px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding-bottom: 20px;
}

/* ── CTA Banner ──────────────────────────────────────────────────────────── */
.cta-section {
  padding: 100px 0 120px;
}

.cta-card {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.15) 0%, rgba(139, 92, 246, 0.2) 100%);
  border: 1px solid rgba(99, 102, 241, 0.4);
  border-radius: var(--radius-lg);
  padding: 60px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-glow);
}

.cta-title {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: 16px;
}

.cta-desc {
  font-size: 1.15rem;
  max-width: 600px;
  margin: 0 auto 36px;
}

/* ── Footer ──────────────────────────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--border-subtle);
  background: #05070D;
  padding: 60px 0 30px;
  font-size: 0.9rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand p {
  margin-top: 12px;
  max-width: 320px;
  font-size: 0.9rem;
}

.footer-col h5 {
  font-size: 1rem;
  margin-bottom: 16px;
  color: #FFFFFF;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  color: var(--text-secondary);
}

.footer-links a:hover {
  color: var(--text-primary);
}

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--text-muted);
  font-size: 0.85rem;
  flex-wrap: wrap;
  gap: 12px;
}

/* ── Responsive ──────────────────────────────────────────────────────────── */
@media (max-width: 900px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  
  .mobile-toggle {
    display: block;
  }
  
  .hero-section {
    padding: 60px 0 40px;
  }
  
  .simulator-container {
    padding: 20px;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
}