:root {
  --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", Arial, "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  --bg-0: #070a12;
  --bg-1: #0b1020;
  --fg-0: rgba(255, 255, 255, 0.92);
  --fg-1: rgba(255, 255, 255, 0.74);
  --fg-2: rgba(255, 255, 255, 0.56);

  --accent-0: #7c3aed;
  --accent-1: #22d3ee;
  --accent-2: #a3ff7a;
  --danger: #fb7185;

  --grad-accent: linear-gradient(135deg, rgba(124, 58, 237, 0.95), rgba(34, 211, 238, 0.9) 50%, rgba(163, 255, 122, 0.75));
  --grad-surface: linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.03));
  --grad-outline: linear-gradient(135deg, rgba(255, 255, 255, 0.22), rgba(255, 255, 255, 0.06));

  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 18px;
  --radius-xl: 26px;

  --shadow-sm: 0 8px 22px rgba(0, 0, 0, 0.28);
  --shadow-md: 0 18px 46px rgba(0, 0, 0, 0.35);
  --shadow-glow: 0 0 0 1px rgba(255, 255, 255, 0.08), 0 24px 64px rgba(0, 0, 0, 0.42);

  --blur: blur(14px);
  --stroke: rgba(255, 255, 255, 0.12);
  --stroke-strong: rgba(255, 255, 255, 0.18);

  --space-1: 6px;
  --space-2: 10px;
  --space-3: 14px;
  --space-4: 18px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 44px;
  --space-8: 64px;
  --space-9: 92px;

  --container: 1120px;
  --header-h: 68px;
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
  --dur: 220ms;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--fg-0);
  background: radial-gradient(900px 520px at 8% 6%, rgba(124, 58, 237, 0.30), transparent 60%),
    radial-gradient(820px 520px at 86% 14%, rgba(34, 211, 238, 0.26), transparent 60%),
    radial-gradient(860px 560px at 46% 92%, rgba(163, 255, 122, 0.14), transparent 64%),
    linear-gradient(180deg, var(--bg-0), var(--bg-1));
  min-height: 100vh;
  line-height: 1.6;
  text-rendering: geometricPrecision;
}

::selection {
  background: rgba(124, 58, 237, 0.35);
}

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

button,
input,
textarea {
  font: inherit;
  color: inherit;
}

img,
svg {
  display: block;
  max-width: 100%;
}

:focus-visible {
  outline: 2px solid rgba(34, 211, 238, 0.9);
  outline-offset: 3px;
  border-radius: 10px;
}

.container {
  width: min(var(--container), calc(100% - 2 * var(--space-6)));
  margin-inline: auto;
}

.section {
  padding: var(--space-9) 0;
  position: relative;
}

.muted {
  color: var(--fg-1);
}

.small {
  font-size: 12px;
  letter-spacing: 0.2px;
}

.skip-link {
  position: absolute;
  left: 12px;
  top: 12px;
  padding: 10px 12px;
  border-radius: 12px;
  background: rgba(0, 0, 0, 0.75);
  border: 1px solid rgba(255, 255, 255, 0.16);
  transform: translateY(-140%);
  transition: transform var(--dur) var(--ease);
  z-index: 1000;
}

.skip-link:focus-visible {
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}