/* latin 子集可变字体，自托管：Google Fonts 的 CSS 会阻塞首屏，且对中文读者所在的网络不可靠 */
@font-face {
  font-family: "Space Grotesk";
  font-style: normal;
  font-weight: 300 700;
  font-display: swap;
  src: url("../fonts/space-grotesk-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: "JetBrains Mono";
  font-style: normal;
  font-weight: 100 800;
  font-display: swap;
  src: url("../fonts/jetbrains-mono-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

:root {
  color-scheme: dark;
  --page: #0b1219;
  --page-deep: #080d12;
  --surface: #101a24;
  --surface-2: #16222e;
  --line: rgba(150, 182, 205, 0.14);
  --line-strong: rgba(150, 182, 205, 0.3);
  --text: #e7eff5;
  --text-2: #a9bccb;
  --text-3: #8296a6;
  --accent: #2fbfa5;
  --accent-ink: #04120e;
  --accent-soft: rgba(47, 191, 165, 0.1);
  --accent-line: rgba(47, 191, 165, 0.34);
  --grain: 0.04;
  --term-bg: #060b10;
  --term-surface: #0c141b;
  --term-text: #d9e8f0;
  --term-dim: #7a8f9e;
  --term-accent: #45d6b8;
  --shadow-1: 0 1px 0 rgba(255, 255, 255, 0.04) inset;
  --r-panel: 16px;
  --r-input: 10px;
  --r-pill: 999px;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --font-sans: "Space Grotesk", "PingFang SC", "HarmonyOS Sans SC", "Source Han Sans SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --shell: 1280px;
}

[data-theme="light"] {
  color-scheme: light;
  --page: #f4f7f8;
  --page-deep: #e9eef1;
  --surface: #fdfefe;
  --surface-2: #eef3f5;
  --line: rgba(11, 32, 48, 0.13);
  --line-strong: rgba(11, 32, 48, 0.26);
  --text: #0b1c27;
  --text-2: #3f5768;
  --text-3: #566e7e;
  --accent: #0b7a66;
  --accent-ink: #ffffff;
  --accent-soft: rgba(11, 122, 102, 0.08);
  --accent-line: rgba(11, 122, 102, 0.3);
  --grain: 0.025;
  --shadow-1: 0 1px 2px rgba(11, 32, 48, 0.06);
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
}

body {
  margin: 0;
  background: var(--page);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0.005em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 60;
  pointer-events: none;
  opacity: var(--grain);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)'/%3E%3C/svg%3E");
}

::selection { background: var(--accent); color: var(--accent-ink); }

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

[hidden] { display: none !important; }

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

h1, h2, h3 { margin: 0; font-weight: 600; letter-spacing: -0.02em; line-height: 1.12; }
p { margin: 0; text-wrap: pretty; }
ul, ol { margin: 0; padding: 0; list-style: none; }
fieldset { margin: 0; padding: 0; border: 0; min-width: 0; }

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

.skip-link {
  position: absolute;
  left: 16px;
  top: -60px;
  z-index: 90;
  padding: 10px 16px;
  background: var(--accent);
  color: var(--accent-ink);
  border-radius: var(--r-pill);
  font-size: 14px;
  font-weight: 600;
  transition: top 0.2s var(--ease);
}
.skip-link:focus { top: 14px; }

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.nb { white-space: nowrap; }

.shell {
  width: min(100% - 48px, var(--shell));
  margin-inline: auto;
}

.section { padding-block: clamp(72px, 9vw, 128px); }
.section__head { max-width: 62ch; }

.h2 {
  font-size: clamp(28px, 3.4vw, 44px);
  letter-spacing: -0.03em;
  text-wrap: balance;
}

.lede {
  margin-top: 18px;
  max-width: 46ch;
  color: var(--text-2);
  font-size: clamp(16px, 1.15vw, 18px);
  line-height: 1.85;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--accent);
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: currentColor;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 48px;
  padding-inline: 26px;
  border-radius: var(--r-pill);
  border: 1px solid transparent;
  font-size: 15.5px;
  font-weight: 600;
  letter-spacing: 0.01em;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color 0.22s var(--ease), border-color 0.22s var(--ease), color 0.22s var(--ease), transform 0.16s var(--ease);
}
.btn:active { transform: scale(0.975); }
.btn--primary { background: var(--accent); color: var(--accent-ink); position: relative; overflow: hidden; }
.btn--primary:hover { background: color-mix(in oklab, var(--accent) 86%, var(--text)); }
.btn--primary::after {
  content: "";
  position: absolute;
  top: -20%;
  bottom: -20%;
  left: 0;
  width: 36%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.38), transparent);
  transform: translateX(-140%) skewX(-18deg);
  pointer-events: none;
}
.btn--primary:hover::after { animation: btnShine 0.65s var(--ease); }
@keyframes btnShine { to { transform: translateX(380%) skewX(-18deg); } }
.btn--ghost {
  border-color: var(--line-strong);
  color: var(--text);
  background: color-mix(in oklab, var(--page) 55%, transparent);
}
.btn--ghost:hover { border-color: var(--accent-line); color: var(--accent); background: var(--accent-soft); }
.btn--sm { height: 38px; padding-inline: 18px; font-size: 14px; }

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--accent);
  font-size: 14.5px;
  font-weight: 600;
  border-bottom: 1px solid var(--accent-line);
  padding-bottom: 2px;
  transition: border-color 0.22s var(--ease);
}
.text-link:hover { border-bottom-color: currentColor; }

.icon-mark {
  display: inline-block;
  flex: none;
  width: 24px;
  height: 24px;
  background-color: var(--accent);
  -webkit-mask: var(--mark) center / contain no-repeat;
  mask: var(--mark) center / contain no-repeat;
}
.icon-mark--sm { width: 17px; height: 17px; }

.progress {
  position: fixed;
  inset: 0 0 auto 0;
  height: 2px;
  z-index: 70;
  pointer-events: none;
}
.progress__bar {
  display: block;
  height: 100%;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: 0 50%;
}
@supports (animation-timeline: scroll()) {
  .progress__bar {
    animation: progressGrow linear both;
    animation-timeline: scroll(root block);
  }
}
@keyframes progressGrow {
  from { transform: scaleX(0); }
  to { transform: scaleX(1); }
}

.nav-sentinel { height: 1px; }

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--page);
  background: color-mix(in oklab, var(--page) 84%, transparent);
  -webkit-backdrop-filter: blur(16px) saturate(1.3);
  backdrop-filter: blur(16px) saturate(1.3);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease);
}
.nav.is-stuck {
  border-bottom-color: var(--line);
  box-shadow: 0 18px 40px -32px rgba(4, 10, 14, 0.9);
}
[data-theme="light"] .nav.is-stuck { box-shadow: 0 18px 40px -34px rgba(11, 28, 39, 0.35); }

.nav__inner {
  display: flex;
  align-items: center;
  gap: 20px;
  height: 64px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: none;
}
.brand__mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: var(--accent-soft);
  border: 1px solid var(--accent-line);
  color: var(--accent);
}
.brand__mark svg { width: 20px; height: 20px; }
.brand__text { display: flex; flex-direction: column; line-height: 1.15; }
.brand__name { font-size: 15.5px; font-weight: 700; letter-spacing: -0.015em; }
.brand__sub { font-size: 11px; color: var(--text-3); letter-spacing: 0.06em; }

.nav__links {
  display: flex;
  align-items: center;
  gap: 22px;
  margin-left: auto;
}
.nav__links a {
  position: relative;
  font-size: 14.5px;
  color: var(--text-2);
  transition: color 0.2s var(--ease);
}
.nav__links a::after {
  content: "";
  position: absolute;
  left: 0; right: 100%; bottom: -5px;
  height: 1px;
  background: var(--accent);
  transition: right 0.28s var(--ease);
}
.nav__links a:hover { color: var(--text); }
.nav__links a:hover::after { right: 0; }
.nav__links a[aria-current="true"] { color: var(--accent); }
.nav__links a[aria-current="true"]::after { right: 0; }

.nav__actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: none;
}

.icon-btn {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text-2);
  cursor: pointer;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), transform 0.16s var(--ease);
}
.icon-btn:hover { color: var(--accent); border-color: var(--accent-line); }
.icon-btn:active { transform: scale(0.95); }
.icon-btn svg { width: 18px; height: 18px; }
.icon-btn .icon-sun { display: none; }
[data-theme="light"] .icon-btn .icon-moon { display: none; }
[data-theme="light"] .icon-btn .icon-sun { display: block; }

.nav__burger { display: none; }
.nav__burger .icon-close { display: none; }
.nav__burger[aria-expanded="true"] .icon-burger { display: none; }
.nav__burger[aria-expanded="true"] .icon-close { display: block; }

.mobile-menu {
  display: none;
  flex-direction: column;
  padding: 8px 24px 20px;
  border-top: 1px solid var(--line);
  background: var(--page);
}
.mobile-menu a {
  padding: 13px 2px;
  font-size: 16px;
  color: var(--text-2);
  border-bottom: 1px solid var(--line);
}
.mobile-menu a:hover { color: var(--accent); }
.mobile-menu a:last-child { border-bottom: 0; }

.hero {
  position: relative;
  display: grid;
  align-content: center;
  min-height: calc(100dvh - 64px);
  padding-block: clamp(48px, 7vh, 96px);
  overflow: hidden;
  background:
    radial-gradient(120% 90% at 88% 8%, color-mix(in oklab, var(--accent) 11%, transparent), transparent 58%),
    radial-gradient(90% 70% at 4% 100%, color-mix(in oklab, var(--accent) 6%, transparent), transparent 60%);
}
.hero__media {
  position: absolute;
  z-index: -1;
  inset: 0 0 0 auto;
  width: 60%;
  margin: 0;
  pointer-events: none;
}
.hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 60% 50%;
  opacity: 0.92;
  -webkit-mask-image: linear-gradient(102deg, transparent 4%, rgba(0, 0, 0, 0.4) 30%, #000 66%);
  mask-image: linear-gradient(102deg, transparent 4%, rgba(0, 0, 0, 0.4) 30%, #000 66%);
}
/* 浅色主题下把深色插画反相成线稿，让它以墨线形式落在浅色页面上 */
[data-theme="light"] .hero__media img {
  opacity: 0.5;
  filter: invert(1) hue-rotate(168deg) saturate(1.4) brightness(0.92) contrast(1.05);
  mix-blend-mode: multiply;
  -webkit-mask-image: linear-gradient(102deg, transparent 14%, rgba(0, 0, 0, 0.5) 42%, #000 74%);
  mask-image: linear-gradient(102deg, transparent 14%, rgba(0, 0, 0, 0.5) 42%, #000 74%);
}

.hero__inner { position: relative; }

@media (prefers-reduced-motion: no-preference) {
  .hero__media img { animation: heroSettle 1.5s var(--ease) both; }
}
@keyframes heroSettle {
  from { transform: scale(1.05); }
  to { transform: scale(1); }
}

.hero__title {
  font-size: clamp(44px, 6.6vw, 92px);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.06;
  color: var(--text);
}
.hero__sub {
  margin-top: 24px;
  max-width: 40ch;
  color: var(--text-2);
  font-size: clamp(16px, 1.2vw, 18.5px);
  line-height: 1.8;
}
.hero__cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }

.protocol { position: relative; background: var(--page); }
.protocol__track { display: none; }
.protocol__stage {
  position: relative;
  display: grid;
  place-items: center;
  padding-block: 104px;
  overflow: hidden;
}
.protocol__wash {
  position: absolute;
  inset: 0;
  background: radial-gradient(72% 62% at 50% 46%, var(--accent-soft), transparent 70%);
}
.protocol__grid { display: none; }
.protocol__inner { position: relative; text-align: center; padding-inline: 24px; }
.protocol__title {
  font-size: clamp(17px, 2vw, 23px);
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--text-2);
}
.protocol__title code { font-family: var(--font-mono); font-size: 0.92em; color: var(--text); }
.protocol__url {
  margin-top: 28px;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(30px, 7vw, 104px);
  letter-spacing: -0.03em;
  line-height: 1.1;
  white-space: nowrap;
  color: var(--text);
}
.u-s { display: inline-block; color: var(--accent); }
.protocol__meta { position: relative; height: 88px; margin-top: 26px; }
.meta-row {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
}
.meta-row--plain { opacity: 0; }
.meta-row--plain .protocol__state { color: var(--text-2); }
.meta-row--secure .protocol__state { color: var(--accent); }
.protocol__state { font-size: 15px; font-weight: 500; letter-spacing: 0.02em; }
.lock { width: 52px; height: 52px; flex: none; }
.lock--open { color: var(--text-3); }
.lock--closed { color: var(--accent); }
.draw { stroke-dasharray: 100; stroke-dashoffset: 0; }
.protocol__chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 26px;
  padding: 7px 16px;
  border: 1px solid var(--accent-line);
  border-radius: var(--r-pill);
  background: var(--accent-soft);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-2);
}
.protocol__chip span { color: var(--accent); font-weight: 500; }

@media (prefers-reduced-motion: no-preference) {
  @supports (animation-timeline: view()) {
    .protocol { height: 300vh; timeline-scope: --proto; }
    .protocol__track {
      display: block;
      position: absolute;
      inset: 0;
      view-timeline-name: --proto;
      view-timeline-axis: block;
    }
    .protocol__stage {
      position: sticky;
      top: 0;
      height: 100dvh;
      min-height: 600px;
      padding-block: 0;
    }
    .protocol__grid {
      display: block;
      position: absolute;
      inset: 0;
      background-image:
        linear-gradient(var(--line) 1px, transparent 1px),
        linear-gradient(90deg, var(--line) 1px, transparent 1px);
      background-size: 44px 44px;
      background-position: center;
      -webkit-mask-image: radial-gradient(78% 72% at 50% 50%, #000 25%, transparent 78%);
      mask-image: radial-gradient(78% 72% at 50% 50%, #000 25%, transparent 78%);
    }
    .u-s { animation: uIn linear both; animation-timeline: --proto; animation-range: 24% 42%; }
    .meta-row--plain { animation: fadeOut linear both; animation-timeline: --proto; animation-range: 24% 42%; }
    .meta-row--secure { animation: fadeIn linear both; animation-timeline: --proto; animation-range: 42% 58%; }
    .draw--shackle { animation: drawStroke linear both; animation-timeline: --proto; animation-range: 44% 58%; }
    .draw--body { animation: drawStroke linear both; animation-timeline: --proto; animation-range: 56% 70%; }
    .protocol__chip { animation: riseIn linear both; animation-timeline: --proto; animation-range: 70% 84%; }
    .protocol__wash { animation: fadeIn linear both; animation-timeline: --proto; animation-range: 20% 80%; }
    .protocol__inner { animation: settle linear both; animation-timeline: --proto; animation-range: 0% 100%; }
    .band__media { animation: bandZoom linear both; animation-timeline: view(); animation-range: entry 0% exit 100%; }
  }
}

@keyframes uIn { from { opacity: 0; translate: -0.35em 0; } to { opacity: 1; translate: 0 0; } }
@keyframes fadeOut { from { opacity: 1; } to { opacity: 0; } }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes drawStroke { from { stroke-dashoffset: 100; } to { stroke-dashoffset: 0; } }
@keyframes riseIn { from { opacity: 0; translate: 0 10px; } to { opacity: 1; translate: 0 0; } }
@keyframes settle { from { transform: scale(0.985); } to { transform: scale(1); } }
@keyframes bandZoom { from { transform: scale(1.07); } to { transform: scale(1); } }

.principle__grid {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: clamp(40px, 6vw, 96px);
  align-items: start;
}
.principle__aside { position: sticky; top: 100px; }
.principle__aside .lede { max-width: 34ch; }
.principle__spec {
  margin-top: 22px;
  padding-left: 12px;
  border-left: 2px solid var(--accent);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--text-3);
}

.steps { display: flex; flex-direction: column; gap: 4px; }
.step {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 24px;
  padding-block: 30px;
  border-top: 1px solid var(--line);
}
.step:last-child { border-bottom: 1px solid var(--line); }
.step__num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--accent);
  padding-top: 4px;
}
.step__body h3 { font-size: 20px; letter-spacing: -0.02em; }
.step__body p { margin-top: 10px; color: var(--text-2); max-width: 52ch; }

.quickstart { background: var(--page-deep); }
[data-theme="light"] .quickstart { background: var(--page-deep); }

.cfg-wrap {
  margin-top: 44px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 20px;
  align-items: stretch;
}

.cfg {
  display: flex;
  flex-direction: column;
  gap: 24px;
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-panel);
  box-shadow: var(--shadow-1);
}
.cfg__group { display: flex; flex-direction: column; gap: 10px; }
.cfg__label {
  padding: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--text-3);
}
.cfg__help { font-size: 13.5px; line-height: 1.7; color: var(--text-3); }
.cfg__error { font-size: 13.5px; line-height: 1.6; color: #ff8a7a; }
[data-theme="light"] .cfg__error { color: #b3241a; }

.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { position: relative; cursor: pointer; }
.chip input {
  position: absolute;
  inset: 0;
  opacity: 0;
  margin: 0;
  cursor: pointer;
}
.chip__body {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  height: 38px;
  padding-inline: 15px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line);
  background: var(--surface-2);
  color: var(--text-2);
  font-size: 14px;
  pointer-events: none;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), background-color 0.2s var(--ease), transform 0.16s var(--ease);
}
.chip:hover .chip__body { border-color: var(--line-strong); color: var(--text); }
.chip input:active + .chip__body { transform: scale(0.975); }
.chip input:checked + .chip__body {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--text);
}
.chip input:checked + .chip__body .icon-mark { background-color: var(--accent); }
.chip input:focus-visible + .chip__body { outline: 2px solid var(--accent); outline-offset: 3px; }
.chip__ver { font-family: var(--font-mono); font-size: 11.5px; color: var(--text-3); }

.cfg__input {
  width: 100%;
  height: 48px;
  padding-inline: 16px;
  border-radius: var(--r-input);
  border: 1px solid var(--line-strong);
  background: var(--page);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 15px;
  transition: border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}
.cfg__input::placeholder { color: var(--text-3); opacity: 1; }
.cfg__input:hover { border-color: var(--text-3); }
.cfg__input:focus { border-color: var(--accent); outline: none; box-shadow: 0 0 0 3px var(--accent-soft); }
.cfg__input[aria-invalid="true"] { border-color: #ff8a7a; }
[data-theme="light"] .cfg__input[aria-invalid="true"] { border-color: #b3241a; }

.cfg__actions { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; }

.console {
  display: flex;
  flex-direction: column;
  border-radius: var(--r-panel);
  border: 1px solid var(--line);
  background: var(--term-bg);
  overflow: hidden;
  box-shadow: 0 24px 60px -30px rgba(0, 0, 0, 0.7);
}
.console__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px 12px 18px;
  background: var(--term-surface);
  border-bottom: 1px solid rgba(150, 182, 205, 0.12);
}
.console__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--term-dim);
}
.copy-btn {
  height: 30px;
  padding-inline: 14px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(150, 182, 205, 0.24);
  background: transparent;
  color: var(--term-text);
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), opacity 0.2s var(--ease), transform 0.16s var(--ease);
}
.copy-btn:hover:not(:disabled) { border-color: var(--term-accent); color: var(--term-accent); }
.copy-btn:active:not(:disabled) { transform: scale(0.96); }
.copy-btn:disabled { opacity: 0.42; cursor: not-allowed; }
.copy-btn.is-done { border-color: var(--term-accent); color: var(--term-accent); }
.copy-btn.is-error { border-color: #ff8a7a; color: #ff8a7a; }

.console__body {
  flex: 1;
  min-height: 168px;
  display: flex;
  align-items: flex-start;
  padding: 22px 20px;
}
.console__empty { display: flex; flex-direction: column; gap: 14px; width: 100%; }
.console__prompt {
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1;
  color: var(--term-accent);
}
.console__caret {
  display: inline-block;
  width: 8px;
  height: 1.05em;
  margin-left: 7px;
  vertical-align: text-bottom;
  background: var(--term-accent);
  animation: caretBlink 1.1s steps(1) infinite;
}
@keyframes caretBlink { 50% { opacity: 0; } }
.console__note { color: var(--term-dim); font-size: 14.5px; line-height: 1.75; max-width: 40ch; }
.console__note--error { color: #ff9b8c; }
.console__code {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(13px, 1.05vw, 15px);
  line-height: 1.8;
  color: var(--term-text);
  white-space: pre-wrap;
  word-break: break-word;
}
.console__code .c-flag { color: var(--term-accent); }
.console__code .c-bin { color: #8fb8d8; }

.console__skeleton { display: flex; flex-direction: column; gap: 12px; width: 100%; }
.console__skeleton span {
  display: block;
  height: 14px;
  border-radius: 4px;
  background: linear-gradient(90deg, rgba(150, 182, 205, 0.14), rgba(150, 182, 205, 0.3), rgba(150, 182, 205, 0.14));
  background-size: 200% 100%;
  animation: shimmer 1.3s linear infinite;
}
.console__skeleton span:nth-child(1) { width: 88%; }
.console__skeleton span:nth-child(2) { width: 62%; }
.console__skeleton span:nth-child(3) { width: 40%; }
@keyframes shimmer {
  from { background-position: 200% 0; }
  to { background-position: -200% 0; }
}

.console__foot {
  padding: 12px 18px 14px;
  border-top: 1px solid rgba(150, 182, 205, 0.12);
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--term-dim);
}

.notes {
  margin-top: 20px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.note { padding-top: 18px; border-top: 2px solid var(--line-strong); }
.note h3 { font-size: 16.5px; letter-spacing: -0.015em; }
.note p { margin-top: 8px; color: var(--text-2); font-size: 14.5px; line-height: 1.75; }

.band {
  position: relative;
  isolation: isolate;
  display: grid;
  align-items: center;
  min-height: clamp(320px, 44vw, 480px);
  overflow: hidden;
}
.band__media {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 50% 50%;
  filter: brightness(1.5) saturate(1.15);
}
.band__scrim {
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(90deg, rgba(8, 13, 18, 0.9) 0%, rgba(8, 13, 18, 0.62) 46%, rgba(8, 13, 18, 0.16) 100%);
}
.band__inner { padding-block: clamp(56px, 8vw, 96px); }
.band__quote {
  max-width: 18ch;
  font-size: clamp(26px, 3.6vw, 46px);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.18;
  color: #eef6fa;
  text-wrap: balance;
}
.band__body {
  margin-top: 22px;
  max-width: 44ch;
  color: rgba(214, 231, 240, 0.82);
  font-size: clamp(15.5px, 1.1vw, 17.5px);
  line-height: 1.8;
}

/* 浅色主题下 band 不反相成黑块：换成与 bento 同源的网格底纹 */
[data-theme="light"] .band { background: var(--surface-2); }
[data-theme="light"] .band__media { display: none; }
[data-theme="light"] .band__scrim {
  background:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 44px 44px;
  -webkit-mask-image: radial-gradient(88% 100% at 76% 50%, #000 8%, transparent 74%);
  mask-image: radial-gradient(88% 100% at 76% 50%, #000 8%, transparent 74%);
}
[data-theme="light"] .band__quote { color: var(--text); }
[data-theme="light"] .band__body { color: var(--text-2); }

.bento {
  margin-top: 40px;
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 16px;
}
.cell {
  grid-column: span 4;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 26px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-panel);
  box-shadow: var(--shadow-1);
}
.cell--w3 { grid-column: span 3; }
.cell--w4 { grid-column: span 4; }
.cell--w5 { grid-column: span 5; }
.cell--w6 { grid-column: span 6; }
.cell--pattern {
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 34px 34px;
  background-position: -1px -1px;
}
.cell--accent {
  background-color: var(--accent-soft);
  border-color: var(--accent-line);
}
.cell__tag {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--accent);
}
.cell__title { font-size: 19px; letter-spacing: -0.02em; }
.cell__body { color: var(--text-2); font-size: 14.5px; line-height: 1.8; }
.cell__foot { margin-top: auto; padding-top: 6px; font-size: 13.5px; color: var(--text-3); }
.cell__foot a { color: var(--accent); border-bottom: 1px solid var(--accent-line); }
.cell__foot a:hover { border-bottom-color: currentColor; }

.cell__grid2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px 20px;
}
.mini { display: flex; gap: 12px; align-items: flex-start; }
.mini__name { font-size: 15px; font-weight: 600; letter-spacing: -0.01em; }
.mini__desc { margin-top: 3px; font-size: 13.5px; line-height: 1.65; color: var(--text-3); }

.hosted__grid {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: clamp(36px, 5vw, 72px);
  align-items: start;
}
.tick-list { margin-top: 30px; display: flex; flex-direction: column; gap: 18px; counter-reset: tick; }
.tick-list li {
  position: relative;
  padding-left: 40px;
  counter-increment: tick;
}
.tick-list li::before {
  content: counter(tick, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 2px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent);
}
.tick-list p { color: var(--text-2); max-width: 48ch; }

.panel {
  padding: 30px;
  border-radius: var(--r-panel);
  border: 1px solid var(--line);
  background:
    linear-gradient(180deg, var(--accent-soft), transparent 62%),
    var(--surface);
}
.panel__tag {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--accent);
}
.panel__title { margin-top: 12px; font-size: 22px; letter-spacing: -0.02em; }
.panel__list { margin-top: 18px; display: flex; flex-direction: column; gap: 12px; }
.panel__list li {
  position: relative;
  padding-left: 20px;
  color: var(--text-2);
  font-size: 14.5px;
  line-height: 1.75;
}
.panel__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}
.panel .text-link { margin-top: 24px; }

.contribute__grid {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: clamp(36px, 5vw, 72px);
  align-items: start;
}
.contribute__note {
  margin-top: 22px;
  font-size: 14px;
  color: var(--text-3);
}
.contribute__links { display: flex; flex-direction: column; gap: 14px; }
.big-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 24px 26px;
  border-radius: var(--r-panel);
  border: 1px solid var(--line);
  background: var(--surface);
  transition: border-color 0.24s var(--ease), background-color 0.24s var(--ease), transform 0.2s var(--ease);
}
.big-link:hover { border-color: var(--accent-line); background: var(--surface-2); transform: translateX(4px); }
.big-link__title { display: block; font-size: 18px; font-weight: 600; letter-spacing: -0.02em; }
.big-link__desc { display: block; margin-top: 5px; font-size: 14px; color: var(--text-3); }
.big-link .arrow { width: 20px; height: 20px; flex: none; color: var(--accent); transition: transform 0.24s var(--ease); }
.big-link:hover .arrow { transform: translate(3px, -3px); }

.thanks {
  margin-top: 64px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 22px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
}
.thanks__label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--text-3);
}
.thanks__text { font-size: 14.5px; color: var(--text-2); }
.thanks__brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  padding: 8px 16px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.01em;
  transition: border-color 0.22s var(--ease), color 0.22s var(--ease);
}
.thanks__brand:hover { border-color: var(--accent-line); color: var(--accent); }

.footer {
  position: relative;
  overflow: hidden;
  border-top: 1px solid var(--line);
  background: var(--page-deep);
  padding-block: 0;
}
.footer .thanks {
  margin-top: 0;
  border-top: 0;
  padding-block: 46px 42px;
}
.footer__top {
  display: grid;
  grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  gap: 48px;
  border-top: 1px solid var(--line);
  padding-top: 48px;
}
.footer__brand { display: flex; flex-direction: column; align-items: flex-start; gap: 16px; }
.footer__desc { max-width: 40ch; font-size: 14px; line-height: 1.8; color: var(--text-2); }
.footer__nav { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 28px 24px; }
.footer__col { display: flex; flex-direction: column; gap: 10px; }
.footer__head {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--text-3);
  margin-bottom: 2px;
}
.footer__col a { font-size: 14.5px; color: var(--text-2); transition: color 0.2s var(--ease); }
.footer__col a:hover { color: var(--accent); }
.footer__bottom {
  margin-top: 48px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 8px 28px;
  font-size: 13px;
  color: var(--text-3);
}
.footer__bottom a { color: var(--text-2); border-bottom: 1px solid var(--line-strong); }
.footer__bottom a:hover { color: var(--accent); border-bottom-color: var(--accent-line); }

.footer__giant {
  margin: 64px 0 -0.23em;
  font-size: clamp(76px, 17.5vw, 250px);
  font-weight: 700;
  letter-spacing: -0.045em;
  line-height: 0.78;
  text-align: center;
  color: transparent;
  -webkit-text-stroke: 1px var(--line-strong);
  user-select: none;
  pointer-events: none;
}
@supports not (-webkit-text-stroke: 1px black) {
  .footer__giant { color: var(--line-strong); }
}

.reveal {
  opacity: 0;
  transform: translate3d(0, 20px, 0);
  transition: opacity 0.72s var(--ease), transform 0.72s var(--ease);
  transition-delay: calc(var(--d, 0) * 1ms);
}
.reveal.is-in { opacity: 1; transform: none; }

@media (max-width: 1120px) {
  .nav__links { gap: 16px; }
  .nav__links a { font-size: 13.5px; }
  .cell--w3, .cell--w4, .cell--w5, .cell--w6 { grid-column: span 6; }
  .cell--w3:last-child, .cell--w4:last-child { grid-column: span 6; }
  .cell--w5 { grid-column: span 12; }
}

@media (max-width: 1024px) {
  .nav__links { display: none; }
  .nav__actions { margin-left: auto; }
  .nav__burger { display: grid; }
  .mobile-menu { display: flex; }
  .mobile-menu[hidden] { display: none; }
  .principle__grid,
  .contribute__grid,
  .hosted__grid,
  .cfg-wrap,
  .footer__top { grid-template-columns: minmax(0, 1fr); }
  .principle__aside { position: static; }
  .principle__aside .lede { max-width: 46ch; }
  .notes { grid-template-columns: 1fr 1fr; }
  .notes .note:last-child { grid-column: span 2; }
  .hosted .panel { max-width: 640px; }
}

@media (max-width: 860px) {
  .shell { width: min(100% - 40px, var(--shell)); }
  .hero { min-height: auto; padding-block: 56px 72px; }
  .hero__media { width: 100%; inset: 0; }
  .hero__media img {
    object-position: 62% 50%;
    opacity: 0.5;
    -webkit-mask-image: linear-gradient(180deg, transparent 0%, rgba(0, 0, 0, 0.6) 46%, #000 88%);
    mask-image: linear-gradient(180deg, transparent 0%, rgba(0, 0, 0, 0.6) 46%, #000 88%);
  }
  [data-theme="light"] .hero__media img { opacity: 0.16; }
  .hero__title { max-width: 100%; }
  .thanks { align-items: flex-start; }
  .thanks__brand { margin-left: 0; }
}

@media (max-width: 640px) {
  .shell { width: min(100% - 32px, var(--shell)); }
  body { font-size: 15.5px; }
  .nav__inner { gap: 12px; }
  .nav__actions .btn--primary { display: none; }
  .cell--w3, .cell--w4, .cell--w5, .cell--w6 { grid-column: span 12; }
  .cell__grid2 { grid-template-columns: 1fr; }
  .notes { grid-template-columns: 1fr; }
  .notes .note:last-child { grid-column: span 1; }
  .cfg { padding: 22px; }
  .console__body { min-height: 140px; padding: 18px 16px; }
  .step { grid-template-columns: 1fr; gap: 10px; }
  .step__num { padding-top: 0; }
  .footer__nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .btn { height: 46px; padding-inline: 22px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    transition-delay: 0ms !important;
  }
  .reveal { opacity: 1; transform: none; }
  .console__skeleton span { background: rgba(150, 182, 205, 0.22); }
  .big-link:hover, .nav__links a:hover::after { transform: none; }
}

@media print {
  .nav, .progress, .cfg-wrap, .hero__media, .protocol__stage, body::after { display: none; }
  body { background: #fff; color: #000; }
  .hero__title { color: #000; }
}