/* ============================================
   AI Chat OutlineMate - Landing Page Styles
   Font: Inter | Dark-first design
   ============================================ */

/* --- CSS Variables (Dark = default) --- */
:root {
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --color-bg: #0a0e1a;
  --color-bg-alt: #0f1322;
  --color-bg-card: rgba(255, 255, 255, 0.04);
  --color-bg-card-hover: rgba(255, 255, 255, 0.08);
  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-hover: rgba(255, 255, 255, 0.16);
  --color-text: #f1f5f9;
  --color-text-secondary: #8b95a8;
  --color-text-muted: #5a6478;
  --color-primary: #ff6b4a;
  --color-primary-hover: #ff8568;
  --color-primary-light: rgba(255, 107, 74, 0.1);
  --color-gradient-1: #ff6b4a;
  --color-gradient-2: #ffb347;
  --color-glow-warm: rgba(255, 140, 60, 0.12);
  --color-glow-warm-strong: rgba(255, 140, 60, 0.2);
  --color-navbar-bg: rgba(10, 14, 26, 0.8);
  --color-card-shadow: none;
  --color-card-shadow-hover: 0 8px 32px rgba(0, 0, 0, 0.3);
  --color-screenshot-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --transition: 200ms ease;
  --transition-slow: 350ms ease;
  --max-width: 1200px;
}

[data-theme="light"] {
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-bg-card: rgba(0, 0, 0, 0.02);
  --color-bg-card-hover: rgba(0, 0, 0, 0.05);
  --color-border: rgba(0, 0, 0, 0.08);
  --color-border-hover: rgba(0, 0, 0, 0.16);
  --color-text: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #94a3b8;
  --color-primary: #e04e3e;
  --color-primary-hover: #c9392a;
  --color-primary-light: rgba(224, 78, 62, 0.08);
  --color-gradient-1: #e04e3e;
  --color-gradient-2: #ff8c42;
  --color-glow-warm: rgba(224, 78, 62, 0.08);
  --color-glow-warm-strong: rgba(224, 78, 62, 0.15);
  --color-navbar-bg: rgba(255, 255, 255, 0.82);
  --color-card-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
  --color-card-shadow-hover: 0 8px 32px rgba(0, 0, 0, 0.08);
  --color-screenshot-shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

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

a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
button { font-family: inherit; border: none; background: none; cursor: pointer; }

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

/* --- Section Common --- */
.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 6px 16px;
  border-radius: 100px;
  margin-bottom: 16px;
  border: 1px solid rgba(255, 107, 74, 0.15);
}

.section-title {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.section-desc {
  font-size: 17px;
  color: var(--color-text-secondary);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.7;
}

/* --- Navbar --- */
.navbar {
  position: fixed;
  top: 12px;
  left: 12px;
  right: 12px;
  z-index: 50;
  background: var(--color-navbar-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: background var(--transition-slow), border-color var(--transition-slow), box-shadow var(--transition-slow);
}

.navbar.scrolled {
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.15);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  gap: 16px;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.brand-text {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.navbar-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-secondary);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}

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

.navbar-actions {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

.btn-ti { min-width: 102px; }

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  cursor: pointer;
  white-space: nowrap;
}

.btn-sm { font-size: 13px; padding: 7px 16px; }

.btn-lg {
  font-size: 16px;
  padding: 14px 32px;
  border-radius: var(--radius-md);
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 20px var(--color-glow-warm-strong);
}

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

.btn-ghost:hover {
  color: var(--color-text);
  border-color: var(--color-border-hover);
  background: var(--color-bg-card);
}

.btn-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  transition: color var(--transition), background var(--transition);
}

.btn-icon:hover {
  color: var(--color-text);
  background: var(--color-primary-light);
}

/* Theme toggle icon visibility */
[data-theme="dark"] .icon-moon,
:root:not([data-theme="light"]) .icon-moon { display: none; }
[data-theme="dark"] .icon-sun,
:root:not([data-theme="light"]) .icon-sun { display: block; }
[data-theme="light"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: block; }

/* --- Hero (Centered) --- */
.hero {
  position: relative;
  padding: 160px 0 100px;
  overflow: hidden;
  text-align: center;
}

.hero-glow-top {
  position: absolute;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 500px;
  background: radial-gradient(ellipse, rgba(255, 107, 74, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero-glow-bottom {
  position: absolute;
  bottom: -80px;
  left: 50%;
  transform: translateX(-50%);
  width: 1000px;
  height: 400px;
  background: radial-gradient(ellipse, var(--color-glow-warm) 0%, transparent 70%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-primary-light);
  border: 1px solid rgba(255, 107, 74, 0.15);
  padding: 6px 18px;
  border-radius: 100px;
  margin-bottom: 28px;
}

.hero-title {
  font-size: clamp(40px, 6vw, 68px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.text-gradient {
  background: linear-gradient(135deg, var(--color-gradient-1), var(--color-gradient-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 18px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 36px;
  max-width: 540px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 64px;
}

/* Stats Row — bordered cards in a row */
.hero-stats-row {
  display: flex;
  gap: 16px;
}

.stat-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 20px 40px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  min-width: 140px;
}

.stat-number {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--color-gradient-1), var(--color-gradient-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 13px;
  color: var(--color-text-muted);
  font-weight: 500;
}

/* --- Features --- */
.features {
  padding: 100px 0;
  position: relative;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.feature-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1),
              box-shadow 0.3s cubic-bezier(0.4, 0, 0.2, 1),
              border-color 0.3s ease,
              background 0.3s ease;
  cursor: default;
}

.feature-card:hover {
  border-color: var(--color-border-hover);
  box-shadow: var(--color-card-shadow-hover), 0 0 40px var(--color-glow-warm);
  background: var(--color-bg-card-hover);
  transform: translateY(-4px);
}

.feature-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--color-primary-light);
  color: var(--color-primary);
  margin-bottom: 20px;
}

.feature-name {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.feature-desc-text {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* --- Platforms --- */
.platforms {
  padding: 100px 0;
}

.platforms-grid {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.platform-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 32px 40px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1),
              box-shadow 0.3s cubic-bezier(0.4, 0, 0.2, 1),
              border-color 0.3s ease;
  min-width: 140px;
}

.platform-card:hover {
  border-color: var(--color-border-hover);
  box-shadow: var(--color-card-shadow-hover), 0 0 40px var(--color-glow-warm);
  transform: translateY(-3px);
}

.platform-logo {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: var(--color-primary-light);
  overflow: hidden;
}

.platform-logo img {
  width: 32px;
  height: 32px;
  object-fit: contain;
}

.platform-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
}

/* --- Screenshots --- */
.screenshots {
  padding: 100px 0;
}

.screenshots-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.screenshot-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  box-shadow: var(--color-card-shadow);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1),
              box-shadow 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
}

.screenshot-card:hover {
  box-shadow: var(--color-screenshot-shadow);
  transform: translateY(-4px);
}

.screenshot-card img {
  width: 100%;
  display: block;
  transition: transform var(--transition-slow);
}

.screenshot-card:hover img {
  transform: scale(1.02);
}

.screenshot-label {
  position: absolute;
  bottom: 12px;
  left: 12px;
  font-size: 12px;
  font-weight: 600;
  color: #fff;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  padding: 4px 12px;
  border-radius: 100px;
}

/* --- Install CTA --- */
.install-cta {
  padding: 100px 0;
}

.cta-card {
  position: relative;
  text-align: center;
  padding: 72px 40px;
  border-radius: var(--radius-xl);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  overflow: hidden;
}

.cta-glow {
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 300px;
  background: radial-gradient(ellipse, var(--color-glow-warm-strong) 0%, transparent 70%);
  pointer-events: none;
}

.cta-title {
  font-size: clamp(24px, 3.5vw, 36px);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
  position: relative;
}

.cta-desc {
  font-size: 17px;
  color: var(--color-text-secondary);
  margin-bottom: 32px;
  position: relative;
}

.cta-card .btn { position: relative; }

/* --- Footer --- */
.footer {
  padding: 32px 0;
  border-top: 1px solid var(--color-border);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 15px;
}

.footer-copy {
  font-size: 13px;
  color: var(--color-text-muted);
}

/* --- Lightbox --- */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
  cursor: zoom-out;
}

.lightbox.active {
  opacity: 1;
  visibility: visible;
}

.lightbox-img {
  max-width: 90vw;
  max-height: 90vh;
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 80px rgba(0, 0, 0, 0.5);
  transform: scale(0.92);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.lightbox.active .lightbox-img {
  transform: scale(1);
}

.lightbox-close {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.15);
  cursor: pointer;
  transition: background 0.2s ease;
}

.lightbox-close:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* --- Scroll Animations --- */
.fade-up {
  opacity: 0;
  transform: translateY(24px);
  transition: all 0.6s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .screenshots-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .screenshots-grid .screenshot-card:last-child {
    grid-column: 1 / -1;
    max-width: 50%;
    margin: 0 auto;
  }
}

@media (max-width: 768px) {
  .navbar-links { display: none; }

  .hero {
    padding: 130px 0 72px;
  }

  .hero-title {
    font-size: clamp(32px, 8vw, 48px);
  }

  .hero-stats-row {
    flex-direction: column;
    gap: 12px;
    width: 100%;
    max-width: 320px;
  }

  .stat-card {
    flex-direction: row;
    justify-content: center;
    gap: 12px;
    padding: 16px 24px;
    min-width: 0;
  }

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

  .platforms-grid { gap: 12px; }

  .platform-card {
    padding: 24px 28px;
    min-width: 120px;
  }

  .screenshots-grid {
    grid-template-columns: 1fr;
  }

  .screenshots-grid .screenshot-card:last-child {
    max-width: 100%;
  }

  .cta-card { padding: 48px 24px; }

  .footer-inner {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }

  .navbar {
    top: 8px;
    left: 8px;
    right: 8px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }
}

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

  html { scroll-behavior: auto; }

  .fade-up {
    opacity: 1;
    transform: none;
  }
}