:root {
  --sv-bg: #000000;
  --sv-fg: #fafafa;
  --sv-muted: #0a0a0a;
  --sv-muted-fg: #71717a;
  --sv-border: rgba(255, 255, 255, 0.08);
  --sv-glow: rgba(255, 255, 255, 0.03);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  background: var(--sv-bg);
  color: var(--sv-fg);
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  margin: 0;
}

::selection {
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
}

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255, 255, 255, 0.1); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255, 255, 255, 0.2); }

/* Cursor Glow */
.cursor-glow {
  position: fixed;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,255,255,0.03) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
  transform: translate(-50%, -50%);
  transition: opacity 0.3s ease;
}

/* Animations */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes typewriter-cursor {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

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

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

@keyframes grain {
  0%, 100% { transform: translate(0, 0); }
  10% { transform: translate(-5%, -10%); }
  30% { transform: translate(7%, -25%); }
  50% { transform: translate(-15%, 10%); }
  70% { transform: translate(0%, 15%); }
  90% { transform: translate(-10%, 10%); }
}

/* Scroll Animations */
.sv-animate {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}
.sv-animate.visible {
  opacity: 1;
  transform: translateY(0);
}
.sv-animate-delay-1 { transition-delay: 0.1s; }
.sv-animate-delay-2 { transition-delay: 0.2s; }
.sv-animate-delay-3 { transition-delay: 0.3s; }
.sv-animate-delay-4 { transition-delay: 0.4s; }

/* Typewriter */
.typewriter-cursor::after {
  content: '|';
  animation: typewriter-cursor 1s infinite;
  margin-left: 2px;
  color: rgba(255, 255, 255, 0.6);
}

/* Navigation */
.sv-nav {
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--sv-border);
}

/* Cards */
.sv-card {
  background: var(--sv-muted);
  border: 1px solid var(--sv-border);
  transition: border-color 0.3s ease, background 0.3s ease, transform 0.3s ease;
}
.sv-card:hover {
  border-color: rgba(255, 255, 255, 0.15);
  background: rgba(255, 255, 255, 0.03);
  transform: translateY(-2px);
}

/* Buttons */
.sv-btn-primary {
  background: #fafafa;
  color: #000000;
  transition: all 0.3s ease;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.sv-btn-primary:hover {
  background: #d4d4d8;
  transform: translateY(-1px);
}

.sv-btn-ghost {
  border: 1px solid var(--sv-border);
  color: var(--sv-fg);
  transition: all 0.3s ease;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.sv-btn-ghost:hover {
  border-color: rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.04);
}

/* Code */
.sv-code {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--sv-border);
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
}

/* Syntax Purifier */
.purifier-input, .purifier-output {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--sv-border);
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  color: var(--sv-fg);
  resize: none;
  transition: border-color 0.3s ease;
  width: 100%;
  font-size: 13px;
  line-height: 1.6;
  padding: 1.25rem;
  border-radius: 0.75rem;
}
.purifier-input:focus, .purifier-output:focus {
  outline: none;
  border-color: rgba(255, 255, 255, 0.2);
}

.purifier-arrow { animation: pulse-subtle 2s infinite; }

/* Dividers */
.sv-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--sv-border), transparent);
}

/* Links */
.sv-link {
  color: var(--sv-muted-fg);
  transition: color 0.2s ease;
  text-decoration: none;
}
.sv-link:hover { color: var(--sv-fg); }

/* Inputs */
.sv-input {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--sv-border);
  color: var(--sv-fg);
  transition: border-color 0.3s ease;
}
.sv-input:focus {
  outline: none;
  border-color: rgba(255, 255, 255, 0.25);
}
.sv-input::placeholder { color: var(--sv-muted-fg); }

/* Grain overlay */
.grain-overlay {
  position: fixed;
  top: -50%; left: -50%; right: -50%; bottom: -50%;
  width: 200%; height: 200%;
  background: transparent url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.02'/%3E%3C/svg%3E") repeat;
  animation: grain 8s steps(10) infinite;
  pointer-events: none;
  z-index: 1;
  opacity: 0.3;
}

.content-layer { position: relative; z-index: 2; }

/* Docs sidebar */
.docs-sidebar { border-right: 1px solid var(--sv-border); }
.docs-sidebar a.active {
  color: var(--sv-fg);
  background: rgba(255, 255, 255, 0.05);
}

/* Blog cards */
.blog-card {
  border: 1px solid var(--sv-border);
  transition: all 0.3s ease;
}
.blog-card:hover {
  border-color: rgba(255, 255, 255, 0.15);
  transform: translateY(-2px);
}

/* Changelog */
.changelog-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: rgba(255,255,255,0.3);
  border: 1px solid rgba(255,255,255,0.1);
}

/* Mobile menu */
.mobile-menu {
  transform: translateX(100%);
  transition: transform 0.3s ease;
}
.mobile-menu.open { transform: translateX(0); }

/* Page enter */
.page-enter { animation: fadeIn 0.5s ease forwards; }

/* Floating icon animation */
.float-icon { animation: float 6s ease-in-out infinite; }

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