/* ==========================================================
   OPEN APHELION — Anthropic 式人文印刷风
   象牙双底 #faf9f5 / #f0eee6 · 暖墨 #1f1d1a · book cloth 橙 #d97757
   衬线宣言 + 无衬线正文 + 等宽数据标注。
   动效纪律：rise ≤300ms，hover ≤240ms，尊重 prefers-reduced-motion。
   ========================================================== */

:root {
  /* Anthropic 校准色板：暖米底 + 赤陶点缀 + 实色细线 */
  --ivory: #f0eee6;
  --ivory-2: #e9e6dd;
  --card: #faf9f4;
  --ink: #1f1d1a;
  --ink-2: #57544d;
  --ink-3: #8a857a;
  --line: #d9d6ce;
  --line-soft: rgba(31, 29, 26, .08);
  --accent: #cc785c;
  --accent-deep: #a85b3f;
  --night: #141413;
  --night-ink: #ece7dd;
  --night-ink-2: #a89f92;
  --night-line: rgba(236, 231, 221, .14);

  /* 全站无衬线：Kumbh Sans（拉丁/字标）+ Noto Sans SC（中文）。
     --serif 变量保留以兼容旧引用，但已指向无衬线栈。 */
  --serif: "Kumbh Sans", "Noto Sans SC", system-ui, -apple-system, sans-serif;
  --sans-en: "Kumbh Sans", "Noto Sans SC", system-ui, -apple-system, sans-serif;
  --sans: "Kumbh Sans", "Noto Sans SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --mono: "IBM Plex Mono", "Cascadia Mono", Consolas, "Courier New", monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--ivory);
  color: var(--ink);
  font: 16px/1.8 var(--sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a { color: inherit; }

h1, h2, h3 { font-family: var(--serif); font-weight: 700; }

/* ---------- 眉标 / 编号体系（sans 小型大写，mono 只做数据） ---------- */
.eyebrow {
  margin: 0 0 16px;
  font: 500 11px/1 var(--sans);
  letter-spacing: .16em;
  color: var(--ink-3);
  text-transform: uppercase;
}
.eyebrow em {
  font-style: normal;
  color: var(--accent-deep);
  margin-right: 10px;
  font-family: var(--mono);
  letter-spacing: .1em;
}

/* ---------- 进入动效（rise ≤300ms） ---------- */
.reveal { opacity: 0; transform: translateY(12px); transition: opacity .3s ease-out, transform .3s ease-out; }
.reveal.in { opacity: 1; transform: none; }
.d1 { transition-delay: .06s; }
.d2 { transition-delay: .12s; }
.d3 { transition-delay: .18s; }

/* ==========================================================
   顶栏 · Anthropic 式导航（照截图布局）
   链接组居左 · 字标绝对居中（全大写宽字距）· 右侧 EN + CTA
   ========================================================== */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  padding: 15px clamp(20px, 4vw, 48px);
  background: color-mix(in srgb, var(--ivory) 92%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

/* ---------- 字标：绝对居中，全大写宽字距 ---------- */
.brand {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  text-decoration: none;
  line-height: 1;
}
.brand-open,
.brand-name {
  font: 600 17px var(--sans-en);
  color: var(--ink);
  letter-spacing: .14em;
  text-transform: uppercase;
  white-space: nowrap;
}

.topnav {
  display: flex;
  gap: clamp(18px, 2.2vw, 30px);
  align-items: center;
}
.topnav a,
.nav-btn {
  font: 400 12.5px/1 var(--sans);
  color: var(--ink-2);
  text-decoration: none;
  padding: 8px 0;
  background: none;
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  transition: color .24s ease;
}
.topnav a:hover, .nav-btn:hover { color: var(--ink); }
.topnav a[aria-current="page"] { color: var(--ink); font-weight: 500; }

.nav-item { position: relative; }
.nav-btn .chev { width: 9px; height: 9px; transition: transform .24s ease; }
.nav-item.open .chev { transform: rotate(180deg); }
.nav-item.open .nav-btn { color: var(--ink); }

/* ---------- 下拉面板（Anthropic 式白卡多列） ---------- */
.menu {
  position: absolute;
  top: calc(100% + 10px);
  left: -16px;
  transform: translateY(6px);
  display: none;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: 0 18px 44px rgba(31, 29, 26, .12);
  padding: 22px 26px;
  gap: 40px;
  z-index: 60;
  white-space: nowrap;
}
.nav-item.open .menu { display: flex; animation: menu-in .2s ease-out forwards; }
@keyframes menu-in {
  from { opacity: 0; transform: translateY(2px); }
  to   { opacity: 1; transform: translateY(0); }
}
.menu-col { min-width: 190px; }
.menu-col + .menu-col { padding-left: 40px; border-left: 1px solid var(--line-soft); }
.menu-title {
  margin: 0 0 10px;
  font: 500 10.5px var(--mono);
  letter-spacing: .12em;
  color: var(--ink-3);
  text-transform: uppercase;
}
.menu a {
  display: block;
  padding: 6px 0;
  font: 400 13.5px/1.5 var(--sans);
  color: var(--ink);
  text-decoration: none;
  transition: color .2s ease;
}
.menu a:hover { color: var(--accent-deep); }
.menu a .sub { display: block; font-size: 11.5px; color: var(--ink-3); }

.topbar-right { display: flex; align-items: center; gap: 12px; flex: none; margin-left: auto; }

.lang-btn {
  font: 500 10.5px var(--mono);
  letter-spacing: .08em;
  color: var(--ink-2);
  background: none;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 7px 12px;
  cursor: pointer;
  transition: color .24s ease, border-color .24s ease;
}
.lang-btn:hover { color: var(--accent-deep); border-color: var(--accent-deep); }

.nav-cta {
  font: 500 13px/1 var(--sans);
  color: var(--ivory);
  background: var(--ink);
  padding: 10px 17px;
  border-radius: 10px;
  text-decoration: none;
  transition: background .24s ease, transform .24s ease;
}
.nav-cta:hover { background: var(--accent-deep); transform: translateY(-1px); }

/* ==========================================================
   HERO
   ========================================================== */
.hero {
  max-width: 1200px;
  margin: 0 auto;
  padding: clamp(48px, 7vw, 100px) clamp(20px, 4vw, 48px) 0;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 10fr) minmax(0, 11fr);
  gap: clamp(28px, 5vw, 64px);
  align-items: center;
}

.hero-copy h1 {
  margin: 0 0 10px;
  font-size: clamp(40px, 5vw, 66px);
  line-height: 1.1;
  letter-spacing: -.005em;
}

/* Hero 超大字标（Kumbh Sans，两级同权） */
.wordmark-hero {
  font-family: var(--sans-en);
  font-weight: 600;
  letter-spacing: -.015em;
  white-space: nowrap;
}
.wordmark-hero .wm-open {
  font-weight: 600;
  color: var(--ink);
  margin-right: .22em;
  letter-spacing: -.015em;
}

.hero-cn {
  margin: 0 0 24px;
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(19px, 2vw, 24px);
  letter-spacing: .08em;
  color: var(--ink);
}

.lead {
  margin: 0 0 34px;
  max-width: 33em;
  font-size: 16.5px;
  line-height: 1.9;
  color: var(--ink-2);
}
.lead strong { color: var(--ink); }

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

.btn-solid, .btn-ghost {
  display: inline-block;
  padding: 13px 26px;
  font: 500 14px/1 var(--sans);
  letter-spacing: .02em;
  text-decoration: none;
  border-radius: 10px;
  transition: background .24s ease, color .24s ease, transform .24s ease, border-color .24s ease;
}
.btn-solid { background: var(--ink); color: var(--ivory); }
.btn-solid:hover { background: var(--accent-deep); transform: translateY(-2px); }
.btn-ghost { background: transparent; color: var(--ink-2); border: none; padding-left: 4px; }
.btn-ghost:hover { color: var(--accent-deep); transform: translateY(-2px); }

/* ---------- 轨道图 ---------- */
.orbit-figure { margin: 0; min-width: 0; }
.orbit-figure svg { width: 100%; height: auto; display: block; }

.orbit-figure figcaption {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
  font: 400 11.5px/1.8 var(--mono);
  color: var(--ink-3);
}

.orbit { fill: none; stroke: var(--ink); stroke-opacity: .42; stroke-width: 1.2; vector-effect: non-scaling-stroke; transition: stroke-opacity .24s ease, stroke .24s ease; }
.orbit.hover { stroke: var(--accent-deep); stroke-opacity: .85; }

.sun-core { fill: var(--accent); }
.sun-halo1 { fill: none; stroke: var(--accent); stroke-opacity: .45; stroke-width: 1; }
.sun-halo2 { fill: none; stroke: var(--accent); stroke-opacity: .16; stroke-width: 1; }

.ap-mark { fill: none; stroke: var(--accent); stroke-width: 1.4; }
.ap-line { stroke: var(--accent); stroke-width: 1; stroke-dasharray: 3 3; }
.ap-label { font: 500 11px var(--mono); letter-spacing: .14em; fill: var(--accent-deep); }
.ap-sub { font: 400 10px var(--sans); fill: var(--ink-3); }

.fig-corner { font: 400 10px var(--mono); letter-spacing: .08em; fill: var(--ink-3); }

.body { cursor: pointer; outline: none; }
.body-dot { fill: var(--ink); transition: fill .24s ease; }
.body-label {
  font: 500 10.5px var(--mono);
  letter-spacing: .12em;
  fill: var(--ink);
  text-anchor: middle;
  opacity: 0;
  transition: opacity .24s ease;
}
.body:hover .body-dot, .body:focus-visible .body-dot { fill: var(--accent-deep); }
.body:hover .body-label, .body:focus-visible .body-label { opacity: 1; }

/* ---------- 彗尾拖迹 ---------- */
.trail-dot { fill: var(--ink); pointer-events: none; }
.trail-dot.t1 { fill: var(--ink); }
.trail-dot.t2 { fill: var(--ink); }

/* ---------- 星空层 ---------- */
.star { fill: var(--ink); pointer-events: none; animation: twinkle 3.4s ease-in-out infinite alternate; }
@keyframes twinkle { from { opacity: .10; } to { opacity: .55; } }

/* ---------- 太阳呼吸 / 点火涟漪 ---------- */
.sun-halo1, .sun-halo2 { transform-box: fill-box; transform-origin: center; }
#orbitSvg:not(.intro) .sun-halo1 { animation: sun-breathe 3.6s ease-in-out infinite; }
#orbitSvg:not(.intro) .sun-halo2 { animation: sun-breathe 3.6s ease-in-out 1.2s infinite; }
@keyframes sun-breathe {
  0%, 100% { transform: scale(1); opacity: 1; }
  50%      { transform: scale(1.07); opacity: .72; }
}
.sun-ripple {
  fill: none; stroke: var(--accent); stroke-width: 1;
  transform-box: fill-box; transform-origin: center;
  animation: sun-ripple 1.15s ease-out forwards;
}
@keyframes sun-ripple {
  from { transform: scale(1); opacity: .55; }
  to   { transform: scale(3.8); opacity: 0; }
}

/* ---------- 描线笔尖 ---------- */
.draw-tip { fill: var(--accent); pointer-events: none; }

/* ---------- 天体信息牌（双行） ---------- */
.body-label .lb-sub {
  font: 400 9.5px var(--mono);
  letter-spacing: .06em;
  fill: var(--ink-3);
}

/* ---------- 时间流速控制 ---------- */
.speed-ctl {
  display: inline-flex;
  gap: 4px;
  margin-left: 12px;
  vertical-align: middle;
}
.speed-btn {
  font: 500 10.5px var(--mono);
  color: var(--ink-3);
  background: none;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 11px;
  cursor: pointer;
  transition: color .24s ease, border-color .24s ease, background .24s ease;
}
.speed-btn:hover { color: var(--ink); border-color: var(--ink-3); }
.speed-btn[aria-pressed="true"] {
  color: var(--ivory);
  background: var(--ink);
  border-color: var(--ink);
}

/* ---------- 开场演示动画（JS 时间轴驱动状态类） ---------- */
#orbitSvg.intro .stars,
#orbitSvg.intro .sun,
#orbitSvg.intro .orbit,
#orbitSvg.intro .body,
#orbitSvg.intro .ap-mark,
#orbitSvg.intro .ap-line,
#orbitSvg.intro .ap-label,
#orbitSvg.intro .ap-sub,
#orbitSvg.intro .fig-corner { opacity: 0; }

#orbitSvg.intro .stars { transition: opacity .8s ease; }
#orbitSvg.s-stars .stars { opacity: 1; }

#orbitSvg.intro .sun { transition: opacity .5s ease; }
#orbitSvg.s-sun .sun { opacity: 1; }

#orbitSvg.s-o1 .o1, #orbitSvg.s-o2 .o2, #orbitSvg.s-o3 .o3 { opacity: 1; transition: opacity .35s ease; }

#orbitSvg.s-b1 #body1, #orbitSvg.s-b2 #body2, #orbitSvg.s-b3 #body3 { opacity: 1; transition: opacity .45s ease; }
#orbitSvg.intro .body-dot { transform: scale(0); transform-box: fill-box; transform-origin: center; }
#orbitSvg.s-b1 #body1 .body-dot, #orbitSvg.s-b2 #body2 .body-dot, #orbitSvg.s-b3 #body3 .body-dot {
  transform: scale(1); transition: transform .5s cubic-bezier(.34,1.56,.64,1);
}

#orbitSvg.s-ap .ap-mark, #orbitSvg.s-ap .ap-line, #orbitSvg.s-ap .ap-label, #orbitSvg.s-ap .ap-sub {
  opacity: 1; transition: opacity .6s ease;
}
#orbitSvg.s-fig .fig-corner { opacity: 1; transition: opacity .6s ease; }

.replay-btn {
  margin-left: 12px;
  font: 500 10.5px var(--mono);
  letter-spacing: .08em;
  color: var(--accent-deep);
  background: none;
  border: 1px solid rgba(217, 119, 87, .45);
  border-radius: 999px;
  padding: 4px 12px;
  cursor: pointer;
  transition: background .24s ease, color .24s ease;
}
.replay-btn:hover { background: var(--accent-deep); color: var(--ivory); }

/* ---------- 子页 ---------- */
.subhero {
  max-width: 1200px;
  margin: 0 auto;
  padding: clamp(48px, 7vw, 96px) clamp(20px, 4vw, 48px) 0;
  scroll-margin-top: 72px;
}
.subhero h1 {
  margin: 0 0 14px;
  font-size: clamp(36px, 4.6vw, 58px);
  line-height: 1.15;
  letter-spacing: -.01em;
}
.subhero .sub-cn {
  margin: 0 0 22px;
  font-size: clamp(16px, 1.6vw, 20px);
  color: var(--ink-3);
  letter-spacing: .06em;
}
.subhero .lead { margin-bottom: 28px; }
.chip-row { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 34px; }
.chip-row .chip { font-size: 11px; padding: 7px 13px; }

.codeblock {
  background: var(--night);
  color: var(--night-ink);
  border-radius: 14px;
  padding: 22px 24px;
  overflow-x: auto;
  font: 400 12.5px/1.9 var(--mono);
  margin: 0 0 28px;
}
.codeblock .cm { color: var(--night-ink-2); }
.codeblock .hl { color: var(--accent); }

.getbox {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  max-width: 760px;
}
.getcell {
  background: var(--card);
  border: 1px solid var(--line-soft);
  border-radius: 16px;
  padding: 24px 26px;
}
.getcell h3 { margin: 0 0 8px; font-size: 17px; }
.getcell p { margin: 0; font-size: 13.5px; line-height: 1.9; color: var(--ink-2); }
.getcell .mono { font-family: var(--mono); font-size: 12px; color: var(--accent-deep); }

.backlink {
  display: inline-block;
  margin-bottom: 22px;
  font: 400 12.5px var(--mono);
  color: var(--ink-3);
  text-decoration: none;
  transition: color .24s ease;
}
.backlink:hover { color: var(--accent-deep); }

/* 子页 prev / next */
.pn {
  max-width: 1200px;
  margin: clamp(56px, 8vw, 100px) auto 0;
  padding: 0 clamp(20px, 4vw, 48px);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.pn a {
  display: block;
  background: var(--card);
  border: 1px solid var(--line-soft);
  border-radius: 16px;
  padding: 22px 26px;
  text-decoration: none;
  transition: transform .24s ease, box-shadow .24s ease;
}
.pn a:hover { transform: translateY(-3px); box-shadow: 0 14px 34px rgba(31,29,26,.07); }
.pn .pn-label { display: block; font: 400 11px var(--mono); letter-spacing: .12em; color: var(--ink-3); margin-bottom: 6px; }
.pn .pn-name { font: 600 18px var(--sans-en); color: var(--ink); }
.pn a.next { text-align: right; }

/* ---------- hero 数据行 ---------- */
.hero-stats {
  list-style: none;
  margin: clamp(44px, 6vw, 76px) 0 0;
  padding: 30px 0 40px;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.hero-stats li { border-left: 1px solid var(--line-soft); padding-left: 20px; }
.hero-stats b {
  display: block;
  font: 500 clamp(22px, 2.6vw, 30px)/1.15 var(--mono);
  letter-spacing: -.02em;
  color: var(--ink);
}
.hero-stats span { font: 400 12px/1.7 var(--mono); color: var(--ink-3); }

/* ==========================================================
   宣言（衬线大字，Anthropic 式）
   ========================================================== */
.manifesto {
  max-width: 860px;
  margin: 0 auto;
  padding: clamp(72px, 10vw, 140px) clamp(20px, 4vw, 48px);
  text-align: left;
}
.manifesto h2 {
  margin: 0 0 26px;
  font-size: clamp(28px, 3.8vw, 46px);
  line-height: 1.35;
  letter-spacing: .01em;
  font-weight: 700;
}
.manifesto h2 em { font-style: normal; color: var(--accent-deep); }
.manifesto p {
  margin: 0;
  max-width: 36em;
  font-size: 16.5px;
  line-height: 2;
  color: var(--ink-2);
}

/* ==========================================================
   通用 Section
   ========================================================== */
.sec {
  max-width: 1200px;
  margin: 0 auto;
  padding: clamp(64px, 9vw, 120px) clamp(20px, 4vw, 48px) 0;
  scroll-margin-top: 72px;
}

.sec-head { margin-bottom: clamp(36px, 5vw, 56px); }
.sec-head h2 {
  margin: 0 0 12px;
  font-size: clamp(27px, 3.4vw, 42px);
  letter-spacing: 0;
  line-height: 1.25;
}
.sec-sub { margin: 0; color: var(--ink-2); font-size: 15.5px; max-width: 40em; }

.prose { max-width: 44em; margin: 0 0 clamp(36px, 5vw, 56px); color: var(--ink-2); font-size: 16px; line-height: 2; }
.prose strong { color: var(--ink); }

/* 交替底色段 */
.tint { background: var(--ivory-2); }
.tint-wrap { margin-top: clamp(72px, 10vw, 140px); padding-bottom: clamp(56px, 8vw, 100px); }
.tint-wrap .sec { padding-top: clamp(64px, 9vw, 120px); }

/* ==========================================================
   作品卡
   ========================================================== */
.cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.card {
  display: flex;
  flex-direction: column;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 30px 28px 26px;
  transition: transform .24s ease, box-shadow .24s ease;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 18px 44px rgba(31, 29, 26, .07);
}
.card:hover .card-no { color: var(--accent-deep); }

.card-top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 22px;
}
.card-no { font: 500 13px/1 var(--mono); color: var(--ink-3); transition: color .24s ease; }
.chip {
  font: 400 10px/1 var(--mono);
  letter-spacing: .1em;
  color: var(--accent-deep);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  border-radius: 999px;
  padding: 6px 11px;
}

.card-title { margin: 0 0 6px; font-size: 25px; }
.card-cn {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--ink-3);
  margin-left: 8px;
  letter-spacing: .12em;
}
.card-role {
  margin: 0 0 16px;
  font: 400 12px/1.6 var(--mono);
  color: var(--accent-deep);
}
.card-desc { margin: 0 0 22px; font-size: 14px; line-height: 1.9; color: var(--ink-2); flex: 1; }

.card-meta { margin: 0 0 20px; }
.card-meta div {
  display: grid;
  grid-template-columns: 84px 1fr;
  gap: 12px;
  padding: 9px 0;
  border-top: 1px solid var(--line-soft);
  font: 400 11.5px/1.7 var(--mono);
}
.card-meta dt { color: var(--ink-3); letter-spacing: .08em; }
.card-meta dd { margin: 0; color: var(--ink); }

.card-link {
  font: 400 13px/1 var(--sans);
  text-decoration: none;
  color: var(--ink-2);
  transition: color .24s ease;
}
.card-link:hover { color: var(--accent-deep); }

/* ==========================================================
   夜航图（深色反转段，Anthropic 式更沉静）
   ========================================================== */
.night {
  background: var(--night);
  color: var(--night-ink);
  border-radius: 24px;
  margin-top: clamp(64px, 9vw, 120px);
  padding-bottom: clamp(56px, 7vw, 88px);
}
.sec.night + .sec.night { margin-top: 20px; }
.night .sec-head h2 { color: var(--night-ink); }
.night .eyebrow { color: var(--night-ink-2); }
.night .eyebrow em { color: var(--accent); }
.night .sec-sub { color: var(--night-ink-2); }

.panel {
  border: 1px solid var(--night-line);
  border-radius: 18px;
  padding: clamp(24px, 3vw, 36px);
  margin-bottom: 18px;
  background: rgba(236, 231, 221, .02);
}

.panel-head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  flex-wrap: wrap;
  padding-bottom: 20px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--night-line);
}
.panel-no { font: 500 13px/1 var(--mono); color: var(--accent); }
.panel-head h3 { margin: 0; font-size: 23px; flex: 1; min-width: 200px; }
.panel-head h3 span {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 400;
  color: var(--night-ink-2);
  margin-left: 10px;
  letter-spacing: .06em;
}
.panel-flag {
  font: 400 10px/1 var(--mono);
  letter-spacing: .12em;
  color: var(--accent);
  background: rgba(217, 119, 87, .12);
  border-radius: 999px;
  padding: 6px 12px;
}

.panel-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 28px;
}
.panel-grid.two { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.pgroup h4 {
  margin: 0 0 12px;
  font: 500 11px/1 var(--mono);
  letter-spacing: .16em;
  color: var(--accent);
}
.pgroup ul { list-style: none; margin: 0; padding: 0; }
.pgroup li {
  position: relative;
  padding: 7px 0 7px 17px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--night-ink);
  border-top: 1px solid rgba(236, 231, 221, .07);
}
.pgroup li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--night-ink-2);
  font-size: 11px;
}
.mono-list li { font: 400 12.5px/1.8 var(--mono); color: var(--night-ink-2); }
.mono-list li::before { content: "·"; color: var(--accent); }

.panel-nums {
  margin: 26px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--night-line);
  font: 400 12.5px/1.9 var(--mono);
  color: var(--night-ink-2);
}
.panel-nums b { color: var(--night-ink); font-weight: 500; font-size: 15px; }
.panel-nums i { font-style: normal; color: var(--accent); margin: 0 10px; }

/* 设计注记（真实引文） */
.panel-note {
  margin: 22px 0 0;
  padding: 16px 20px;
  border-left: 2px solid var(--accent);
  background: rgba(236, 231, 221, .03);
  border-radius: 0 12px 12px 0;
  font-family: var(--serif);
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--night-ink);
}
.panel-note cite {
  display: block;
  margin-top: 6px;
  font: 400 11px/1.6 var(--mono);
  font-style: normal;
  color: var(--night-ink-2);
}

/* ==========================================================
   轨道日志（时间线）
   ========================================================== */
.log {
  list-style: none;
  margin: 0;
  padding: 0;
  max-width: 780px;
}
.log li {
  position: relative;
  display: grid;
  grid-template-columns: 128px 1fr;
  gap: 22px;
  padding: 22px 0 26px;
  border-top: 1px solid var(--line-soft);
}
.log li:last-child { border-bottom: 1px solid var(--line-soft); }
.log-time {
  font: 400 12px/1.9 var(--mono);
  color: var(--accent-deep);
  letter-spacing: .04em;
}
.log-body b {
  display: block;
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 6px;
}
.log-body p { margin: 0; font-size: 14px; line-height: 1.95; color: var(--ink-2); }

/* ==========================================================
   命名宇宙 · 工程原则
   ========================================================== */
.principles {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 28px;
}
.principle { border-top: 1px solid var(--ink); padding-top: 18px; }
.p-no { font: 500 11px/1 var(--mono); color: var(--accent-deep); letter-spacing: .1em; }
.principle h3 { margin: 12px 0 10px; font-size: 18px; }
.principle p { margin: 0; font-size: 13.5px; line-height: 1.95; color: var(--ink-2); }

/* ==========================================================
   开源与 colophon
   ========================================================== */
.openbox {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  max-width: 860px;
}
.open-cell {
  background: var(--card);
  border: 1px solid var(--line-soft);
  border-radius: 16px;
  padding: 26px 28px;
}
.open-cell h3 { margin: 0 0 10px; font-size: 19px; }
.open-cell p { margin: 0; font-size: 14px; line-height: 1.95; color: var(--ink-2); }
.open-cell p b { color: var(--ink); }
.open-cell .mono { font-family: var(--mono); font-size: 12px; color: var(--ink-2); }

/* ==========================================================
   团队
   ========================================================== */
.crew { max-width: 600px; }
.crew-name { margin: 0; font-family: var(--serif); font-weight: 700; font-size: 34px; }
.crew-role { margin: 10px 0 18px; font: 400 12px/1 var(--mono); letter-spacing: .16em; color: var(--accent-deep); }
.crew-bio { margin: 0; color: var(--ink-2); font-size: 15.5px; line-height: 2; }

/* ==========================================================
   Footer
   ========================================================== */
.foot {
  max-width: 1200px;
  margin: clamp(72px, 10vw, 130px) auto 0;
  padding: 30px clamp(20px, 4vw, 48px) 44px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
  font: 400 11.5px/2 var(--mono);
  color: var(--ink-3);
}
.foot b { color: var(--ink); font-weight: 500; letter-spacing: .14em; }
.foot i { font-style: normal; color: var(--accent-deep); margin: 0 8px; }

.foot-brand { line-height: 1 !important; }
.foot-brand .fb-open,
.foot-brand > span b { font: 600 15px var(--sans-en); color: var(--ink); letter-spacing: -.005em; }

/* 字标彩蛋注解 */
.type-note {
  max-width: 44em;
  margin: 0 0 clamp(36px, 5vw, 56px);
  padding: 16px 22px;
  border-left: 2px solid var(--accent);
  background: var(--card);
  border-radius: 0 12px 12px 0;
  font-size: 14.5px;
  line-height: 2;
  color: var(--ink-2);
}
.type-note p { margin: 0; }
.type-note b { color: var(--ink); }

/* ==========================================================
   响应式
   ========================================================== */
@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; }
  .cards { grid-template-columns: 1fr; }
  .panel-grid, .panel-grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .principles { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .openbox { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .topnav { display: none; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); row-gap: 28px; }
  .panel-grid, .panel-grid.two { grid-template-columns: 1fr; }
  .principles { grid-template-columns: 1fr; }
  .foot { flex-direction: column; }
  .log li { grid-template-columns: 1fr; gap: 6px; }
}

/* ==========================================================
   动效尊重：prefers-reduced-motion
   ========================================================== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .card:hover { transform: none; }
  .btn-solid:hover, .btn-ghost:hover { transform: none; }
  #orbitSvg.intro .sun, #orbitSvg.intro .orbit, #orbitSvg.intro .body,
  #orbitSvg.intro .ap-mark, #orbitSvg.intro .ap-line, #orbitSvg.intro .ap-label,
  #orbitSvg.intro .ap-sub, #orbitSvg.intro .fig-corner, #orbitSvg.intro .stars { opacity: 1; }
  #orbitSvg.intro .body-dot { transform: none; }
  #orbitSvg:not(.intro) .sun-halo1, #orbitSvg:not(.intro) .sun-halo2 { animation: none; }
  .speed-ctl { display: none; }
}