/* ==================== */
/* CSS Reset & Base     */
/* ==================== */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Colors */
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #3b82f6;
  --secondary: #64748b;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --bg-main: #ffffff;
  --bg-alt: #f8fafc;
  --bg-dark: #0f172a;
  --border: #e2e8f0;
  --success: #10b981;
  --error: #ef4444;
  --highlight: #fbbf24;
  --highlight-bg: #fef3c7;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
}

html {
  scroll-behavior: smooth;
}

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* ==================== */
/* Hero Section         */
/* ==================== */

.hero {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  padding: var(--space-3xl) 0;
  text-align: center;
  color: white;
}

.hero-badge {
  display: inline-block;
  background: rgba(255, 255, 255, 0.2);
  padding: var(--space-xs) var(--space-md);
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: var(--space-md);
  backdrop-filter: blur(10px);
}

.hero-title {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: var(--space-md);
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: 1.25rem;
  max-width: 700px;
  margin: 0 auto var(--space-xl);
  opacity: 0.95;
  line-height: 1.7;
}

.hero-buttons {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  margin-bottom: var(--space-md);
  flex-wrap: wrap;
}

.hero-note {
  font-size: 0.875rem;
  opacity: 0.8;
}

/* ==================== */
/* Buttons              */
/* ==================== */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 0.875rem 1.75rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-lg);
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all 0.2s ease;
  font-family: var(--font-sans);
}

.btn-primary {
  background: white;
  color: var(--primary);
  box-shadow: var(--shadow-lg);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.15);
  color: white;
  border: 2px solid rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.25);
  transform: translateY(-2px);
}

.btn-large {
  padding: 1.125rem 2.5rem;
  font-size: 1.125rem;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* ==================== */
/* Demo Section         */
/* ==================== */

.demo {
  padding: var(--space-3xl) 0;
  background: var(--bg-alt);
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--space-md);
  letter-spacing: -0.02em;
}

.section-subtitle {
  text-align: center;
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
}

.demo-container {
  display: grid;
  grid-template-columns: 1fr 420px;
  gap: var(--space-lg);
  max-width: 1100px;
  margin: 0 auto;
  background: white;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}

/* Mock YouTube Player */
.mock-youtube {
  background: #000;
  color: white;
  display: flex;
  flex-direction: column;
}

.video-header {
  padding: var(--space-md);
  background: #0f0f0f;
}

.video-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

.video-meta {
  font-size: 0.875rem;
  color: #aaa;
}

.video-player {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  min-height: 400px;
  background: linear-gradient(135deg, #1a1a1a 0%, #2a2a2a 100%);
}

.video-placeholder {
  color: rgba(255, 255, 255, 0.5);
}

.video-timestamp {
  position: absolute;
  bottom: var(--space-md);
  left: var(--space-md);
  background: rgba(0, 0, 0, 0.8);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.875rem;
}

/* Mock Side Panel */
.mock-panel {
  background: #fafafa;
  display: flex;
  flex-direction: column;
  border-left: 1px solid var(--border);
}

.panel-header {
  padding: var(--space-md);
  border-bottom: 1px solid var(--border);
  background: white;
}

.panel-logo {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.logo-icon {
  font-size: 1.25rem;
}

.logo-text {
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--text-primary);
}

.beta-badge {
  background: var(--primary);
  color: white;
  padding: 0.125rem 0.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.panel-search {
  padding: var(--space-md);
  background: white;
  border-bottom: 1px solid var(--border);
}

.panel-search input {
  width: 100%;
  padding: var(--space-sm);
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  font-size: 0.9375rem;
  font-family: var(--font-sans);
  transition: border-color 0.2s;
}

.panel-search input:focus {
  outline: none;
  border-color: var(--primary);
}

.search-results {
  margin-top: var(--space-xs);
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.panel-transcript {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-sm);
}

.transcript-item {
  padding: var(--space-sm);
  margin-bottom: var(--space-xs);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.15s ease;
  display: flex;
  gap: var(--space-sm);
  align-items: flex-start;
  font-size: 0.875rem;
  line-height: 1.5;
}

.transcript-item:hover {
  background: rgba(37, 99, 235, 0.05);
}

.transcript-item.active {
  background: rgba(37, 99, 235, 0.1);
  border-left: 3px solid var(--primary);
  padding-left: calc(var(--space-sm) - 3px);
}

.transcript-item .time {
  font-family: var(--font-mono);
  color: var(--text-secondary);
  font-size: 0.75rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.transcript-item .text {
  color: var(--text-primary);
}

.transcript-item mark {
  background: var(--highlight-bg);
  color: var(--text-primary);
  padding: 1px 2px;
  border-radius: 2px;
  font-weight: 600;
}

.demo-hint {
  padding: var(--space-md);
  background: rgba(37, 99, 235, 0.05);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.875rem;
  color: var(--primary);
  font-weight: 500;
}

.demo-hint svg {
  flex-shrink: 0;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* ==================== */
/* Features Section     */
/* ==================== */

.features {
  padding: var(--space-3xl) 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}

.feature-card {
  padding: var(--space-lg);
  background: white;
  border-radius: var(--radius-xl);
  border: 1px solid var(--border);
  transition: all 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-light);
}

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-md);
}

.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.feature-card p {
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ==================== */
/* Use Cases Section    */
/* ==================== */

.use-cases {
  padding: var(--space-3xl) 0;
  background: var(--bg-alt);
}

.use-cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}

.use-case {
  text-align: center;
  padding: var(--space-lg);
}

.use-case-emoji {
  font-size: 3rem;
  margin-bottom: var(--space-md);
}

.use-case h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.use-case p {
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ==================== */
/* Waitlist Section     */
/* ==================== */

.waitlist {
  padding: var(--space-3xl) 0;
}

.waitlist-content {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
}

.waitlist-form {
  margin: var(--space-xl) 0;
}

.form-group {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.form-group input[type="email"] {
  flex: 1;
  padding: 0.875rem var(--space-md);
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  font-size: 1rem;
  font-family: var(--font-sans);
  transition: border-color 0.2s;
}

.form-group input[type="email"]:focus {
  outline: none;
  border-color: var(--primary);
}

.form-group input[type="email"]::placeholder {
  color: var(--text-muted);
}

.form-group .btn {
  flex-shrink: 0;
  background: var(--primary);
  color: white;
  position: relative;
}

.form-group .btn:hover {
  background: var(--primary-dark);
}

.btn-loader svg {
  animation: spin 1s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.form-message {
  font-size: 0.875rem;
  padding: var(--space-sm);
  border-radius: var(--radius-md);
  display: none;
}

.form-message.success {
  display: block;
  background: rgba(16, 185, 129, 0.1);
  color: var(--success);
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.form-message.error {
  display: block;
  background: rgba(239, 68, 68, 0.1);
  color: var(--error);
  border: 1px solid rgba(239, 68, 68, 0.2);
}

.waitlist-note {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* ==================== */
/* Final CTA Section    */
/* ==================== */

.final-cta {
  padding: var(--space-3xl) 0;
  background: var(--bg-dark);
  color: white;
  text-align: center;
}

.cta-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--space-xl);
  letter-spacing: -0.02em;
}

.final-cta .btn-primary {
  background: var(--primary);
  color: white;
}

.final-cta .btn-primary:hover {
  background: var(--primary-light);
}

.cta-note {
  margin-top: var(--space-md);
  font-size: 0.875rem;
  opacity: 0.8;
}

/* ==================== */
/* Footer               */
/* ==================== */

.footer {
  padding: var(--space-xl) 0;
  background: var(--bg-dark);
  color: var(--text-muted);
  text-align: center;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* ==================== */
/* Responsive Design    */
/* ==================== */

@media (max-width: 1024px) {
  .demo-container {
    grid-template-columns: 1fr;
    max-width: 600px;
  }

  .mock-panel {
    border-left: none;
    border-top: 1px solid var(--border);
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .section-title {
    font-size: 2rem;
  }

  .hero-buttons {
    flex-direction: column;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

  .form-group {
    flex-direction: column;
  }

  .features-grid,
  .use-cases-grid {
    grid-template-columns: 1fr;
  }

  .cta-title {
    font-size: 1.75rem;
  }
}

@media (max-width: 480px) {
  :root {
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
  }

  .hero-title {
    font-size: 1.75rem;
  }

  .container {
    padding: 0 var(--space-sm);
  }
}