@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  --bg: #0a0a0f;
  --bg-raised: #12121c;
  --bg-glass: rgba(18,18,28,0.65);
  --bg-input: #0e0e18;
  --line: rgba(255,255,255,0.08);
  --line-hover: rgba(255,255,255,0.15);
  --blue: #00e5ff;
  --blue-glow: rgba(0,229,255,0.4);
  --purple: #8b5cf6;
  --purple-glow: rgba(139,92,246,0.4);
  --gradient: linear-gradient(100deg, #00e5ff, #8b5cf6);
  --green: #4ade80;
  --red: #ef4444;
  --amber: #f59e0b;
  --text: #f2f2f6;
  --text-dim: #8b8b98;
  --text-dimmer: #5c5c68;
  --radius: 14px;
  --radius-sm: 8px;
  --radius-full: 9999px;
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --header-bg: rgba(10,10,15,0.7);
  --selection-bg: var(--blue);
  --selection-color: #000;
  color-scheme: dark;
}

/* ======= LIGHT THEME ======= */
[data-theme="light"] {
  --bg: #f5f5f7;
  --bg-raised: #ffffff;
  --bg-glass: rgba(255,255,255,0.75);
  --bg-input: #eeeef2;
  --line: rgba(0,0,0,0.07);
  --line-hover: rgba(0,0,0,0.15);
  --blue: #0099cc;
  --blue-glow: rgba(0,153,204,0.2);
  --purple: #7c3aed;
  --purple-glow: rgba(124,58,237,0.2);
  --gradient: linear-gradient(100deg, #0099cc, #7c3aed);
  --text: #1a1a2e;
  --text-dim: #5c5c6e;
  --text-dimmer: #8b8b98;
  --header-bg: rgba(255,255,255,0.72);
  --selection-bg: var(--purple);
  --selection-color: #fff;
  color-scheme: light;
}

[data-theme="light"] body::before {
  background-image:
    radial-gradient(circle at 15% 10%, rgba(0,153,204,0.06) 0%, transparent 40%),
    radial-gradient(circle at 85% 30%, rgba(124,58,237,0.06) 0%, transparent 40%),
    repeating-linear-gradient(to right, rgba(0,0,0,0.015) 0, rgba(0,0,0,0.015) 1px, transparent 1px, transparent 48px),
    repeating-linear-gradient(to bottom, rgba(0,0,0,0.015) 0, rgba(0,0,0,0.015) 1px, transparent 1px, transparent 48px);
}

/* Light theme — header glass white */
[data-theme="light"] header,
[data-theme="light"] #main-header {
  background: rgba(255,255,255,0.72);
  border-bottom: 1px solid rgba(0,0,0,0.06);
  box-shadow: 0 1px 12px rgba(0,0,0,0.04);
}
/* Light — nav links */
[data-theme="light"] .nav-links { color: #3a3a4e; }
[data-theme="light"] .nav-links a:hover { color: #1a1a2e; }
[data-theme="light"] .nav-cta { border-color: var(--purple); color: var(--purple); }
[data-theme="light"] .nav-cta:hover { background: var(--purple); color: #fff; box-shadow: 0 0 20px var(--purple-glow); }
[data-theme="light"] .logo .bracket { color: #b0b0b8; }
/* Light — mobile nav */
[data-theme="light"] .nav-links.open,
[data-theme="light"] .menu-toggle span { background: #1a1a2e; }
@media (max-width: 860px) {
  [data-theme="light"] .nav-links { background: rgba(255,255,255,0.95); }
}
/* Light — components */
[data-theme="light"] .btn-primary { color: #fff; }
[data-theme="light"] .btn-ghost { border-color: rgba(0,0,0,0.1); }
[data-theme="light"] .btn-ghost:hover { background: rgba(0,0,0,0.03); border-color: rgba(0,0,0,0.2); }
[data-theme="light"] .card { box-shadow: 0 2px 12px rgba(0,0,0,0.04); }
[data-theme="light"] .card:hover { border-color: rgba(0,153,204,0.3); box-shadow: 0 8px 24px rgba(0,0,0,0.08); }
[data-theme="light"] .preloader { background: #f5f5f7; }
[data-theme="light"] ::-webkit-scrollbar-track { background: #f5f5f7; }
[data-theme="light"] ::-webkit-scrollbar-thumb { background: #ddd; border-color: rgba(0,0,0,0.05); }
[data-theme="light"] .toast { box-shadow: 0 10px 40px rgba(0,0,0,0.1); background: #fff; }
[data-theme="light"] .terminal { background: #1a1a2e; }
[data-theme="light"] .terminal-bar { background: #22223a; }
[data-theme="light"] .theme-toggle { border-color: rgba(0,0,0,0.1); color: #5c5c6e; }
[data-theme="light"] .theme-toggle:hover { background: rgba(124,58,237,0.08); border-color: var(--purple); color: var(--purple); }

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color 0.3s ease, color 0.3s ease;
}

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

::selection {
  background: var(--selection-bg);
  color: var(--selection-color);
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  transition: background-image 0.3s ease;
  background-image: 
    radial-gradient(circle at 15% 10%, var(--blue-glow) 0%, transparent 40%), 
    radial-gradient(circle at 85% 30%, var(--purple-glow) 0%, transparent 40%),
    repeating-linear-gradient(to right, rgba(255,255,255,0.025) 0, rgba(255,255,255,0.025) 1px, transparent 1px, transparent 48px),
    repeating-linear-gradient(to bottom, rgba(255,255,255,0.025) 0, rgba(255,255,255,0.025) 1px, transparent 1px, transparent 48px);
}

.wrap {
  max-width: 1180px;
  margin: auto;
  padding: 0 28px;
  position: relative;
  z-index: 1;
}

h1 {
  font-size: clamp(34px, 5vw, 56px);
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.5px;
}

h2 {
  font-size: clamp(26px, 4vw, 36px);
  font-family: var(--font-display);
  font-weight: 600;
}

h3 {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 600;
}

h4 {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--text-dim);
}

.grad {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.text-center { text-align: center; }
.text-dim { color: var(--text-dim); }
.text-dimmer { color: var(--text-dimmer); }

:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
}

::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--bg-raised); border: 1px solid var(--line); border-radius: var(--radius-full); }
::-webkit-scrollbar-thumb:hover { background: var(--blue); }

/* ======= THEME TOGGLE BUTTON ======= */
.theme-toggle {
  background: none;
  border: 1px solid var(--line);
  color: var(--text-dim);
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.25s ease;
  position: relative;
  overflow: hidden;
  flex-shrink: 0;
}
.theme-toggle:hover {
  border-color: var(--blue);
  color: var(--blue);
  background: rgba(0,229,255,0.08);
}
.theme-toggle svg { width: 18px; height: 18px; transition: transform 0.3s ease, opacity 0.3s ease; }
.theme-toggle .icon-sun { position: absolute; opacity: 0; transform: rotate(-90deg) scale(0.5); }
.theme-toggle .icon-moon { opacity: 1; transform: rotate(0) scale(1); }
[data-theme="light"] .theme-toggle .icon-sun { opacity: 1; transform: rotate(0) scale(1); }
[data-theme="light"] .theme-toggle .icon-moon { opacity: 0; transform: rotate(90deg) scale(0.5); }