/* ---------- Theme tokens ---------- */
:root {
  --bg: #0b0b14;
  --bg-2: #12121f;
  --card: rgba(255, 255, 255, 0.04);
  --card-border: rgba(255, 255, 255, 0.08);
  --text: #ececf4;
  --muted: #9a9ab0;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  --shadow-hover: 0 18px 40px rgba(0, 0, 0, 0.5);
  --accent-1: #8b5cf6; /* purple */
  --accent-2: #22d3ee; /* cyan */
  --grad: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  --radius: 18px;
  color-scheme: dark;
}

[data-theme="light"] {
  --bg: #f7f7fb;
  --bg-2: #ffffff;
  --card: #ffffff;
  --card-border: rgba(20, 20, 40, 0.08);
  --text: #16162a;
  --muted: #5e5e78;
  --shadow: 0 10px 30px rgba(40, 40, 80, 0.08);
  --shadow-hover: 0 18px 40px rgba(40, 40, 80, 0.14);
  color-scheme: light;
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background 0.3s, color 0.3s;
}
h1, h2, h3 { line-height: 1.15; margin: 0 0 0.5em; }
p { margin: 0 0 0.75em; }
code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
  background: var(--card-border);
  padding: 0.1em 0.35em;
  border-radius: 6px;
}
a { color: inherit; }
.muted { color: var(--muted); }
.small { font-size: 0.875rem; }
.grad {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- Top bar ---------- */
.topbar {
  position: fixed; inset: 0 0 auto 0; z-index: 10;
  display: flex; justify-content: space-between; align-items: center;
  padding: 14px 20px;
  backdrop-filter: blur(10px);
  background: color-mix(in srgb, var(--bg) 70%, transparent);
  border-bottom: 1px solid var(--card-border);
}
.brand { font-weight: 800; text-decoration: none; }
.icon-btn {
  width: 40px; height: 40px; border-radius: 50%;
  border: 1px solid var(--card-border); background: var(--card);
  cursor: pointer; font-size: 1.1rem;
}
[data-theme="dark"] .icon-sun, [data-theme="light"] .icon-moon { display: none; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-block; font: inherit; font-weight: 600;
  padding: 0.75em 1.4em; border-radius: 999px; cursor: pointer;
  text-decoration: none; border: 1px solid transparent;
  transition: transform 0.2s, box-shadow 0.2s, opacity 0.2s;
}
.btn.primary { background: var(--grad); color: #fff; box-shadow: 0 8px 24px rgba(139, 92, 246, 0.35); }
.btn.ghost { background: transparent; color: var(--text); border-color: var(--card-border); }
.btn:hover { transform: translateY(-2px); }
.btn:disabled { opacity: 0.6; cursor: progress; transform: none; }
.btn:focus-visible, .icon-btn:focus-visible { outline: 2px solid var(--accent-2); outline-offset: 3px; }

/* ---------- Hero ---------- */
.hero {
  position: relative; min-height: 100vh; min-height: 100svh;
  display: grid; place-items: center; text-align: center;
  padding: 100px 20px 60px; overflow: hidden;
}
.hero-inner { position: relative; max-width: 760px; }
.eyebrow { text-transform: uppercase; letter-spacing: 0.15em; font-size: 0.8rem; color: var(--muted); font-weight: 600; }
.hero h1 { font-size: clamp(2.4rem, 8vw, 5rem); font-weight: 800; letter-spacing: -0.03em; }
.tagline { font-size: clamp(1rem, 2.4vw, 1.25rem); color: var(--muted); max-width: 560px; margin: 0 auto 2rem; }

/* Animated gradient blobs */
.hero-bg { position: absolute; inset: 0; filter: blur(70px); opacity: 0.55; }
.blob { position: absolute; border-radius: 50%; width: 45vmax; height: 45vmax; animation: drift 18s ease-in-out infinite alternate; }
.b1 { background: var(--accent-1); top: -15%; left: -10%; }
.b2 { background: var(--accent-2); bottom: -20%; right: -10%; animation-delay: -6s; }
.b3 { background: #ec4899; width: 25vmax; height: 25vmax; top: 40%; left: 45%; opacity: 0.5; animation-delay: -12s; }
[data-theme="light"] .hero-bg { opacity: 0.3; }
@keyframes drift {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(8vw, 6vh) scale(1.15); }
}

/* ---------- Sections & cards ---------- */
.section { max-width: 1100px; margin: 0 auto; padding: 80px 20px; }
.section h2 { font-size: clamp(1.8rem, 4vw, 2.5rem); text-align: center; margin-bottom: 1.5em; }
.grid { display: grid; gap: 20px; grid-template-columns: repeat(auto-fit, minmax(min(100%, 230px), 1fr)); }
.demo-grid { display: grid; gap: 20px; grid-template-columns: repeat(auto-fit, minmax(min(100%, 420px), 1fr)); }

.card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  transition: transform 0.25s, box-shadow 0.25s;
  min-width: 0;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.card-icon {
  width: 48px; height: 48px; border-radius: 14px; display: grid; place-items: center;
  font-size: 1.4rem; background: var(--grad); margin-bottom: 16px;
}
.card p { color: var(--muted); }
.panel { display: flex; flex-direction: column; gap: 8px; }
.panel .btn { align-self: flex-start; margin-top: auto; }
.big-line { font-size: 1.35rem; font-weight: 600; color: var(--text) !important; }
.big-line small { font-size: 0.9rem; color: var(--muted); font-weight: 500; }
.big-line strong { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }

.details { display: grid; grid-template-columns: auto 1fr; gap: 4px 16px; margin: 0 0 12px; font-size: 0.9rem; }
.details dt { color: var(--muted); }
.details dd { margin: 0; overflow-wrap: anywhere; }

/* Latency meter */
.meter { height: 10px; border-radius: 999px; background: var(--card-border); overflow: hidden; }
.meter-bar { height: 100%; width: 0; background: var(--grad); border-radius: inherit; transition: width 0.6s cubic-bezier(0.2, 0.8, 0.2, 1); }

/* Clocks */
.clocks { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.clocks p { margin: 0; }
.clock { font-size: clamp(1.4rem, 4vw, 1.9rem); font-weight: 800; font-variant-numeric: tabular-nums; }

/* Copy row */
.copy-row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin-bottom: 8px; }
.url { flex: 1 1 180px; padding: 0.7em 0.9em; border-radius: 12px; overflow-wrap: anywhere; }
.copy-row .btn { margin-top: 0; }

/* ---------- Footer ---------- */
.footer { text-align: center; padding: 40px 20px 60px; color: var(--muted); border-top: 1px solid var(--card-border); }

/* ---------- Toast ---------- */
.toast {
  position: fixed; left: 50%; bottom: 28px; z-index: 30;
  transform: translate(-50%, 20px); opacity: 0; pointer-events: none;
  background: var(--grad); color: #fff; font-weight: 600;
  padding: 10px 20px; border-radius: 999px; box-shadow: var(--shadow);
  transition: opacity 0.25s, transform 0.25s;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ---------- Confetti canvas ---------- */
#confetti { position: fixed; inset: 0; width: 100%; height: 100%; pointer-events: none; z-index: 40; }

/* ---------- Scroll reveal ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
  .card:hover, .btn:hover { transform: none; }
}

@media (max-width: 480px) {
  .card { padding: 22px; }
  .clocks { grid-template-columns: 1fr; }
}