:root {
      color-scheme: dark;
      --bg: oklch(13% 0.012 245);
      --bg-2: oklch(17% 0.016 245);
      --panel: oklch(20% 0.018 245);
      --line: oklch(35% 0.02 245 / 0.62);
      --line-soft: oklch(34% 0.018 245 / 0.35);
      --text: oklch(91% 0.012 230);
      --muted: oklch(68% 0.018 236);
      --soft: oklch(78% 0.018 236);
      --accent: oklch(72% 0.13 196);
      --accent-2: oklch(78% 0.115 145);
      --warn: oklch(80% 0.13 82);
      --shadow: 0 30px 90px oklch(5% 0.01 245 / 0.45);
      --max: 1180px;
      --pad: clamp(20px, 4vw, 56px);
      --radius: 8px;
      --ease: cubic-bezier(.16, 1, .3, 1);
      --page-bg:
        radial-gradient(circle at 84% 12%, oklch(50% 0.08 198 / 0.18), transparent 32vw),
        radial-gradient(circle at 12% 40%, oklch(42% 0.07 148 / 0.14), transparent 28vw),
        linear-gradient(180deg, oklch(12% 0.014 245), oklch(16% 0.014 245) 46%, oklch(11% 0.012 245));
      --nav-bg: linear-gradient(180deg, oklch(13% 0.012 245 / 0.92), oklch(13% 0.012 245 / 0.68), transparent);
      --card-bg: linear-gradient(180deg, oklch(23% 0.018 245 / 0.68), oklch(16% 0.014 245 / 0.72)), linear-gradient(135deg, oklch(72% 0.13 196 / 0.12), transparent 42%);
      --card-hover-bg: linear-gradient(180deg, oklch(24% 0.02 245 / 0.82), oklch(16% 0.014 245 / 0.78)), linear-gradient(135deg, oklch(72% 0.13 196 / 0.18), transparent 48%);
      --surface-bg: oklch(16% 0.014 245 / 0.74);
      --case-bg: linear-gradient(180deg, oklch(21% 0.016 245 / 0.72), oklch(15% 0.014 245 / 0.72));
      --terminal-bg: oklch(10% 0.012 245 / 0.9);
      --terminal-bar-bg: oklch(18% 0.014 245);
      --chip-bg: oklch(100% 0 0 / 0.03);
      --grid-x: oklch(100% 0 0 / 0.055);
      --grid-y: oklch(100% 0 0 / 0.04);
      --scan-bg: linear-gradient(110deg, transparent 0 42%, oklch(74% 0.11 196 / 0.08) 42% 42.2%, transparent 42.2% 100%), repeating-linear-gradient(90deg, oklch(100% 0 0 / 0.022) 0 1px, transparent 1px 6px);
      font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif;
    }

    :root[data-theme="light"] {
      color-scheme: light;
      --bg: oklch(97% 0.008 238);
      --bg-2: oklch(93% 0.012 238);
      --panel: oklch(99% 0.004 238);
      --line: oklch(68% 0.025 235 / 0.58);
      --line-soft: oklch(74% 0.02 235 / 0.36);
      --text: oklch(22% 0.018 238);
      --muted: oklch(46% 0.02 238);
      --soft: oklch(36% 0.022 238);
      --accent: oklch(52% 0.13 196);
      --accent-2: oklch(52% 0.115 145);
      --warn: oklch(60% 0.13 82);
      --shadow: 0 30px 90px oklch(60% 0.03 238 / 0.22);
      --page-bg:
        radial-gradient(circle at 84% 12%, oklch(77% 0.08 198 / 0.2), transparent 32vw),
        radial-gradient(circle at 12% 40%, oklch(76% 0.07 148 / 0.16), transparent 28vw),
        linear-gradient(180deg, oklch(98% 0.008 238), oklch(94% 0.012 238) 46%, oklch(98% 0.006 238));
      --nav-bg: linear-gradient(180deg, oklch(98% 0.008 238 / 0.92), oklch(98% 0.008 238 / 0.68), transparent);
      --card-bg: linear-gradient(180deg, oklch(100% 0.004 238 / 0.82), oklch(94% 0.008 238 / 0.78)), linear-gradient(135deg, oklch(65% 0.11 196 / 0.14), transparent 42%);
      --card-hover-bg: linear-gradient(180deg, oklch(100% 0.004 238 / 0.95), oklch(94% 0.008 238 / 0.88)), linear-gradient(135deg, oklch(62% 0.12 196 / 0.18), transparent 48%);
      --surface-bg: oklch(99% 0.004 238 / 0.78);
      --case-bg: linear-gradient(180deg, oklch(100% 0.004 238 / 0.76), oklch(94% 0.008 238 / 0.76));
      --terminal-bg: oklch(96% 0.008 238 / 0.9);
      --terminal-bar-bg: oklch(91% 0.012 238);
      --chip-bg: oklch(20% 0.01 238 / 0.035);
      --grid-x: oklch(20% 0.01 238 / 0.055);
      --grid-y: oklch(20% 0.01 238 / 0.04);
      --scan-bg: linear-gradient(110deg, transparent 0 42%, oklch(62% 0.11 196 / 0.1) 42% 42.2%, transparent 42.2% 100%), repeating-linear-gradient(90deg, oklch(20% 0.01 238 / 0.025) 0 1px, transparent 1px 6px);
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
      background: var(--bg);
    }

    body {
      margin: 0;
      min-width: 320px;
      color: var(--text);
      background: var(--page-bg);
      line-height: 1.75;
      letter-spacing: 0;
      overflow-x: hidden;
      transition: color .35s var(--ease), background .45s var(--ease);
    }

    body::before {
      content: "";
      position: fixed;
      inset: 0;
      pointer-events: none;
      z-index: -2;
      background-image:
        linear-gradient(to right, var(--grid-x) 1px, transparent 1px),
        linear-gradient(to bottom, var(--grid-y) 1px, transparent 1px);
      background-size: 96px 96px;
      mask-image: linear-gradient(to bottom, black, transparent 78%);
    }

    body::after {
      content: "";
      position: fixed;
      inset: 0;
      pointer-events: none;
      z-index: -1;
      background: var(--scan-bg);
      opacity: 0.42;
    }

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

    img, svg {
      display: block;
    }

    .page {
      position: relative;
      display: flex;
      flex-direction: column;
      min-height: 100vh;
    }

    .nav {
      position: sticky;
      top: 0;
      z-index: 20;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
      width: min(100%, calc(var(--max) + var(--pad) * 2));
      margin: 0 auto;
      padding: 18px var(--pad);
      background: var(--nav-bg);
      backdrop-filter: blur(14px);
    }

    .brand {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      min-width: 0;
      font-weight: 680;
      letter-spacing: 0.02em;
    }

    .brand-mark {
      position: relative;
      width: 32px;
      height: 32px;
      border: 1px solid var(--line);
      border-radius: 50%;
      background:
        conic-gradient(from 110deg, var(--accent), transparent 26%, var(--accent-2), transparent 62%, var(--accent)),
        oklch(16% 0.014 245);
      box-shadow: 0 0 32px oklch(72% 0.13 196 / 0.22);
    }

    .brand-mark::after {
      content: "";
      position: absolute;
      inset: 9px;
      border-radius: 50%;
      background: var(--bg);
      border: 1px solid oklch(80% 0.08 196 / 0.5);
    }

    .brand span {
      white-space: nowrap;
    }

    .nav-links {
      display: flex;
      align-items: center;
      justify-content: flex-end;
      gap: clamp(14px, 2vw, 28px);
      color: var(--soft);
      font-size: 14px;
    }

    .nav-right {
      display: flex;
      align-items: center;
      justify-content: flex-end;
      gap: clamp(12px, 2vw, 24px);
      min-width: 0;
    }

    .nav-tools {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 4px;
      border: 1px solid var(--line-soft);
      border-radius: 999px;
      background: oklch(100% 0 0 / 0.035);
    }

    .tool-button {
      height: 30px;
      min-width: 42px;
      padding: 0 10px;
      border: 0;
      border-radius: 999px;
      color: var(--soft);
      background: transparent;
      font: inherit;
      font-size: 12px;
      font-weight: 760;
      letter-spacing: 0.04em;
      cursor: pointer;
      transition: color .25s var(--ease), background .25s var(--ease), transform .25s var(--ease);
    }

    .tool-button:hover {
      color: var(--text);
    }

    .tool-button.is-active {
      color: var(--bg);
      background: var(--text);
    }

    .theme-toggle {
      position: relative;
      width: 58px;
      height: 30px;
      border: 1px solid var(--line-soft);
      border-radius: 999px;
      background: oklch(100% 0 0 / 0.035);
      cursor: pointer;
      transition: background .35s var(--ease), border-color .35s var(--ease);
    }

    .theme-toggle::before {
      content: "";
      position: absolute;
      top: 4px;
      left: 4px;
      width: 20px;
      height: 20px;
      border-radius: 50%;
      background: var(--accent);
      box-shadow: 0 0 18px oklch(72% 0.13 196 / 0.35);
      transition: transform .38s var(--ease), background .35s var(--ease), box-shadow .35s var(--ease);
    }

    :root[data-theme="light"] .theme-toggle::before {
      transform: translateX(28px);
      background: var(--accent-2);
      box-shadow: 0 0 18px oklch(52% 0.115 145 / 0.28);
    }

    .nav-links a {
      opacity: 0.82;
      transition: opacity .2s var(--ease), color .2s var(--ease);
    }

    .nav-links a:hover {
      color: var(--text);
      opacity: 1;
    }

    .shell {
      width: min(100%, calc(var(--max) + var(--pad) * 2));
      margin: 0 auto;
      padding: 0 var(--pad);
    }


    footer a {
      color: var(--soft);
      transition: color .2s var(--ease);
    }

    footer a:hover {
      color: var(--text);
    }

    footer {
      padding: 26px var(--pad) 36px;
      border-top: 1px solid var(--line-soft);
      color: var(--muted);
      font-size: 13px;
    }

    .footer-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
      width: min(100%, var(--max));
      margin: 0 auto;
    }

    .reveal {
      opacity: 0;
      transform: translateY(18px);
      transition: opacity .7s var(--ease), transform .7s var(--ease);
    }

    .reveal.in {
      opacity: 1;
      transform: translateY(0);
    }

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

      *, *::before, *::after {
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
      }

      .reveal {
        opacity: 1;
        transform: none;
      }
    }

    @media (max-width: 980px) {
      .nav-links { display: none; }
    }

    @media (max-width: 680px) {
      :root { --pad: 18px; }

      .nav {
        padding-top: 14px;
        padding-bottom: 14px;
      }

      .brand span { font-size: 14px; }

      .footer-inner {
        flex-direction: column;
        align-items: flex-start;
      }
    }