/* ============================================
   Snowify Website — Stylesheet
   ============================================ */

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

:root {
  --bg-primary: #08080d;
  --bg-secondary: #0e0e16;
  --bg-card: #13131f;
  --bg-card-hover: #191930;
  --bg-nav: rgba(8, 8, 13, 0.8);
  --accent: #bb6eef;
  --accent-hover: #cc8cf5;
  --accent-glow: rgba(187, 110, 239, 0.15);
  --accent-glow-strong: rgba(187, 110, 239, 0.3);
  --text-primary: #e8e8ee;
  --text-secondary: #9090a8;
  --text-muted: #5e5e78;
  --border: rgba(255, 255, 255, 0.06);
  --border-hover: rgba(255, 255, 255, 0.12);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --container: 1100px;
}

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

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

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

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* --- Snowfall Canvas --- */
#snowfall {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  opacity: 0.5;
}

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

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--bg-nav);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

.nav.scrolled {
  background: rgba(8, 8, 13, 0.95);
}

.nav-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text-primary);
  transition: var(--transition);
}

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

.nav-logo img {
  width: 32px;
  height: 32px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
  position: relative;
}

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

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
  transition: width var(--transition);
}

.nav-links a:hover::after {
  width: 100%;
}

.nav-github {
  display: flex;
  align-items: center;
  color: var(--text-secondary) !important;
  transition: var(--transition);
}

.nav-github:hover {
  color: var(--text-primary) !important;
}

.nav-github::after {
  display: none !important;
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-secondary);
  border-radius: 1px;
  transition: var(--transition);
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

.nav-mobile {
  display: none;
  flex-direction: column;
  padding: 0 24px 20px;
  gap: 4px;
}

.nav-mobile a {
  display: block;
  padding: 12px 16px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.nav-mobile a:hover {
  background: var(--bg-card);
  color: var(--text-primary);
}

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

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

.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  background: var(--accent-glow);
  padding: 6px 16px;
  border-radius: 50px;
  margin-bottom: 20px;
}

.section-header h2 {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.section-header p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 520px;
  margin: 0 auto;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: var(--font);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: var(--accent);
  color: #080810;
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-glow-strong);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

/* --- Hero --- */
.hero {
  position: relative;
  padding: 160px 24px 80px;
  text-align: center;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  margin: 0 auto;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-glow);
  border: 1px solid rgba(110, 193, 228, 0.15);
  border-radius: 50px;
  margin-bottom: 32px;
}

.badge-dot {
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero-logo {
  width: 100px;
  height: 100px;
  margin: 0 auto 24px;
  filter: drop-shadow(0 0 30px var(--accent-glow-strong));
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.hero-title {
  font-size: clamp(3rem, 8vw, 5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #ffffff 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 40px;
}

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

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 64px;
}

/* Hero Screenshot */
.hero-preview {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow:
    0 0 0 1px var(--border),
    0 20px 60px rgba(0, 0, 0, 0.5),
    0 0 80px var(--accent-glow);
  transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(0.23, 1, 0.32, 1),
              box-shadow 0.4s ease-out;
  will-change: transform, box-shadow;
}

.hero-screenshot {
  width: 100%;
  border-radius: var(--radius-lg);
  transition: var(--transition);
}

/* --- Features --- */
.features {
  position: relative;
  z-index: 1;
  padding: 120px 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  max-width: 100%;
  margin: 0 auto;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: var(--transition);
  opacity: 0;
  transform: translateY(20px);
}

.feature-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.feature-card.visible:hover {
  transform: translateY(-4px);
}

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

.feature-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --- Screenshots --- */
.screenshots {
  position: relative;
  z-index: 1;
  padding: 120px 0;
}

.screenshots-tabs {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.tab-btn {
  padding: 10px 22px;
  font-size: 0.88rem;
  font-weight: 600;
  font-family: var(--font);
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 50px;
  cursor: pointer;
  transition: var(--transition);
}

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

.tab-btn.active {
  color: #080810;
  background: var(--accent);
  border-color: var(--accent);
}

.screenshots-viewer {
  opacity: 0;
  transform: translateY(20px);
}

.screenshots-viewer.visible {
  opacity: 1;
  transform: translateY(0);
}

.screenshot-frame {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow:
    0 20px 60px rgba(0, 0, 0, 0.4),
    0 0 60px var(--accent-glow);
}

.frame-dots {
  display: flex;
  gap: 8px;
  padding: 14px 20px;
  background: rgba(0, 0, 0, 0.3);
}

.frame-dots span {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
}

.frame-dots span:first-child {
  background: #ff5f57;
}

.frame-dots span:nth-child(2) {
  background: #ffbd2e;
}

.frame-dots span:nth-child(3) {
  background: #28c840;
}

.screenshot-frame img {
  width: 100%;
  transition: opacity 0.4s ease;
}

.screenshot-frame img.loading {
  opacity: 0.3;
}

/* --- Download --- */
.download {
  position: relative;
  z-index: 1;
  padding: 120px 0;
}

.download-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-bottom: 40px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.download-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px;
  text-align: center;
  transition: var(--transition);
  opacity: 0;
  transform: translateY(20px);
}

.download-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.download-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.download-card.visible:hover {
  transform: translateY(-4px);
}

.download-icon {
  color: var(--accent);
  margin-bottom: 20px;
  display: flex;
  justify-content: center;
}

.download-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.download-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

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

.download-cards.detected {
  grid-template-columns: 1fr;
  max-width: 440px;
}

.download-cards.detected .download-card {
  display: none;
}

.download-cards.detected .download-card.platform-match {
  display: block;
}

.download-cards.show-all {
  grid-template-columns: repeat(2, 1fr);
  max-width: 800px;
}

.download-cards.show-all .download-card {
  display: block;
}

.platform-toggle {
  background: none;
  border: none;
  color: var(--accent);
  font-family: var(--font);
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--transition);
  padding: 0;
}

.platform-toggle:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

.platform-toggle.hidden {
  display: none;
}

.download-note {
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.download-note p {
  margin-bottom: 8px;
}

.download-note a {
  color: var(--accent);
  transition: var(--transition);
}

.download-note a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

.download-note strong {
  color: var(--text-primary);
}

/* --- Footer --- */
.footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--border);
  padding: 48px 0 32px;
  background: var(--bg-secondary);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 32px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.05rem;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: var(--transition);
}

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

.footer-disclaimer {
  text-align: center;
  padding: 24px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin-bottom: 24px;
}

.footer-disclaimer p {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.footer-disclaimer strong {
  color: var(--text-secondary);
}

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

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

/* --- Animations --- */
[data-animate] {
  transition: opacity 0.6s ease, transform 0.6s ease;
}

/* --- Responsive --- */
@media (max-width: 900px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

  .nav-toggle {
    display: flex;
  }

  .hero {
    padding: 140px 24px 60px;
    min-height: auto;
  }

  .hero-logo {
    width: 72px;
    height: 72px;
  }

  .hero-actions {
    margin-bottom: 48px;
  }

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

  .features {
    padding: 80px 0;
  }

  .features-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .screenshots {
    padding: 80px 0;
  }

  .screenshots-tabs {
    gap: 6px;
  }

  .tab-btn {
    padding: 8px 16px;
    font-size: 0.82rem;
  }

  .download {
    padding: 80px 0;
  }

  .download-cards {
    grid-template-columns: 1fr;
  }

  .download-cards.show-all {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    flex-direction: column;
    gap: 20px;
    text-align: center;
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
  }

  .section-header {
    margin-bottom: 40px;
  }

  .section-header h2 {
    font-size: 1.75rem;
  }

  .section-header p {
    font-size: 1rem;
  }
}

@media (max-width: 480px) {
  .hero-badge {
    font-size: 0.75rem;
    padding: 6px 14px;
  }

  .feature-card {
    padding: 24px;
  }

  .download-card {
    padding: 28px;
  }

  .btn {
    padding: 12px 22px;
    font-size: 0.9rem;
  }
}

/* --- Scrollbar --- */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--bg-card-hover);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* --- Selection --- */
::selection {
  background: var(--accent);
  color: #080810;
}