/* ==========================================================================
   Noise Landing Page - Main Layout, Sections & Animations
   ========================================================================== */

/* --- Dynamic Background Canvas --- */
#bg-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  pointer-events: none;
  opacity: 0.65;
}

[data-theme="light"] #bg-canvas {
  opacity: 0.25;
}

/* Ambient Background Radial Glows */
.ambient-glow-1 {
  position: fixed;
  top: -150px;
  left: 20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.07) 0%, transparent 70%);
  filter: blur(80px);
  z-index: -1;
  pointer-events: none;
}

.ambient-glow-2 {
  position: fixed;
  top: 40%;
  right: -100px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.12) 0%, transparent 70%);
  filter: blur(90px);
  z-index: -1;
  pointer-events: none;
}

/* --- Global Section Containers --- */
.site-container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 100px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 56px auto;
}

.section-tag {
  display: inline-block;
  margin-bottom: 12px;
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  line-height: 1.15;
  color: var(--text-primary);
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.section-desc {
  font-size: 1.08rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.gradient-text {
  background: linear-gradient(135deg, #ffffff 0%, #cbd5e1 50%, #94a3b8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

[data-theme="light"] .gradient-text {
  background: linear-gradient(135deg, #09090b 0%, #3f3f46 50%, #71717a 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* --- Sticky Glass Navigation Header --- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(7, 7, 9, 0.75);
  backdrop-filter: var(--glass-blur-heavy);
  -webkit-backdrop-filter: var(--glass-blur-heavy);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 100;
  transition: all var(--transition-normal);
}

[data-theme="light"] .site-header {
  background: rgba(244, 246, 251, 0.85);
}

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

.brand-link {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.brand-icon {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  box-shadow: 0 0 16px rgba(255, 255, 255, 0.15);
  transition: transform var(--transition-fast);
}

.brand-link:hover .brand-icon {
  transform: scale(1.08) rotate(4deg);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

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

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

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.theme-toggle-btn {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-default);
  background: var(--bg-surface);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  background: var(--bg-surface-hover);
  color: var(--text-primary);
}

.mobile-menu-btn {
  display: none;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-default);
  background: var(--bg-surface);
  color: var(--text-primary);
  align-items: center;
  justify-content: center;
}

/* --- Hero Section --- */
.hero-section {
  padding-top: calc(var(--header-height) + 60px);
  padding-bottom: 60px;
  text-align: center;
  position: relative;
}

.hero-content {
  max-width: 860px;
  margin: 0 auto 48px auto;
}

.hero-pill {
  margin-bottom: 24px;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2.5rem, 5.5vw, 4.2rem);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
  color: var(--text-primary);
}

.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 680px;
  margin: 0 auto 36px auto;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.hero-meta-note {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  font-size: 0.84rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.hero-meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* --- Interactive Showcase & Sandbox Section --- */
.sandbox-section {
  padding: 60px 0 100px 0;
}

.sandbox-tab-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 28px;
}

.sandbox-tab-btn {
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.9rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  color: var(--text-muted);
  transition: all var(--transition-fast);
}

.sandbox-tab-btn:hover {
  background: var(--bg-surface-hover);
  color: var(--text-primary);
}

.sandbox-tab-btn.active {
  background: var(--bg-surface-elevated);
  border-color: var(--brand-primary);
  color: var(--text-primary);
  box-shadow: 0 0 16px rgba(255, 255, 255, 0.15);
}

/* --- Features Grid --- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

/* --- Deep Dive Feature Split Sections --- */
.deepdive-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 100px;
}

.deepdive-row:last-child {
  margin-bottom: 0;
}

.deepdive-row.reversed {
  direction: rtl;
}

.deepdive-row.reversed .deepdive-content,
.deepdive-row.reversed .deepdive-visual {
  direction: ltr;
}

.deepdive-content {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.deepdive-content h3 {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  line-height: 1.2;
}

.deepdive-content p {
  font-size: 1.02rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.deepdive-feature-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 8px;
}

.deepdive-list-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.deepdive-check-icon {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 2px;
}

.deepdive-visual {
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xl);
  padding: 24px;
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

/* Conflict Visualizer Mock */
.conflict-demo-box {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.conflict-timeline-row {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 16px;
  background: rgba(14, 15, 20, 0.8);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
}

/* --- GitHub Community & Open Source Section --- */
.github-banner {
  background: linear-gradient(135deg, rgba(24, 24, 27, 0.9) 0%, rgba(39, 39, 42, 0.6) 100%), var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-xl);
  padding: 48px;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 36px;
  align-items: center;
  box-shadow: var(--shadow-lg);
}

[data-theme="light"] .github-banner {
  background: linear-gradient(135deg, rgba(241, 245, 249, 0.9) 0%, rgba(226, 232, 240, 0.8) 100%), var(--bg-card);
}

@media (max-width: 860px) {
  .github-banner {
    grid-template-columns: 1fr;
    padding: 32px 24px;
  }
}

.github-banner-content h3 {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.github-banner-content p {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.6;
  margin-bottom: 24px;
}

.github-stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.github-stat-card {
  padding: 18px 14px;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  text-align: center;
}

.stat-value {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--brand-primary-light);
  margin-bottom: 2px;
}

.stat-label {
  font-size: 0.76rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.clone-code-block {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  background: #090a0f;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 10px 16px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: #38bdf8;
  margin-top: 18px;
}

/* --- Download Hub Grid --- */
.download-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 28px;
  align-items: stretch;
}

@media (max-width: 900px) {
  .download-grid {
    grid-template-columns: 1fr;
  }
}

.download-secondary-options {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.download-opt-card {
  padding: 20px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: all var(--transition-fast);
}

.download-opt-card:hover {
  border-color: var(--border-strong);
  transform: translateX(4px);
}

.opt-info h4 {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.opt-info p {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* --- Site Footer --- */
.site-footer {
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-app);
  padding: 60px 0 36px 0;
  margin-top: 40px;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

@media (max-width: 860px) {
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 520px) {
  .footer-top {
    grid-template-columns: 1fr;
  }
}

.footer-brand p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-top: 12px;
  max-width: 280px;
}

.footer-col h5 {
  font-family: var(--font-heading);
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  font-size: 0.88rem;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.82rem;
  color: var(--text-dim);
  flex-wrap: wrap;
  gap: 12px;
}

/* --- Mobile Navigation Drawer --- */
.mobile-nav-overlay {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(7, 7, 9, 0.95);
  backdrop-filter: var(--glass-blur-heavy);
  display: none;
  flex-direction: column;
  padding: 32px 24px;
  gap: 20px;
  z-index: 99;
}

.mobile-nav-overlay.open {
  display: flex;
}

.mobile-nav-link {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  padding: 10px 0;
  border-bottom: 1px solid var(--border-subtle);
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .mobile-menu-btn {
    display: flex;
  }
  .deepdive-row {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .deepdive-row.reversed {
    direction: ltr;
  }
}