/* ============================================================
   Second Brain — Landing
   设计语言：Ethereal Glass（OLED 黑 + 极光网 + 玻璃层）
   动效：自定义 cubic-bezier，仅 transform/opacity
   ============================================================ */

:root {
  --bg: #050506;
  --bg-2: #0a0a0d;
  --ink: #f2f0f5;
  --ink-2: #b9b6c4;
  --muted: #7d7a8c;
  --line: rgba(255, 255, 255, .09);
  --line-2: rgba(255, 255, 255, .16);
  --card: rgba(255, 255, 255, .028);
  --card-2: rgba(255, 255, 255, .05);
  --violet: #7c5cff;
  --cyan: #22d3ee;
  --amber: #ffb454;
  --green: #34d399;
  --ease: cubic-bezier(.32, .72, 0, 1);
  --ease-2: cubic-bezier(.22, 1, .36, 1);
  --r-lg: 2rem;
  --r-md: 1.25rem;
  --r-sm: .875rem;
  --shell: 1220px;
  --font: "Plus Jakarta Sans", "Geist", -apple-system, "Segoe UI Variable Display",
          "Segoe UI", "PingFang SC", "Microsoft YaHei UI", "Microsoft YaHei", sans-serif;
  --mono: "JetBrains Mono", "SFMono-Regular", ui-monospace, "Cascadia Code", Consolas, monospace;
}

html[data-theme="light"] {
  --bg: #f7f5f1;
  --bg-2: #efece6;
  --ink: #16151a;
  --ink-2: #43414d;
  --muted: #6d6a78;
  --line: rgba(20, 18, 26, .1);
  --line-2: rgba(20, 18, 26, .18);
  --card: rgba(255, 255, 255, .68);
  --card-2: rgba(255, 255, 255, .9);
  --violet: #6039f5;
  --cyan: #0891b2;
  --amber: #b4700c;
  --green: #059669;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
  letter-spacing: -.005em;
  overflow-x: hidden;
  transition: background .5s var(--ease), color .5s var(--ease);
}

/* ── 背景层：极光 + 颗粒 ─────────────────────────── */
.aurora {
  position: fixed; inset: 0; z-index: 0; pointer-events: none; overflow: hidden;
}

/* ── 全景 3D 纵深星空与神经元背景画布 ───────────────── */
.webgl-bg {
  position: fixed; inset: 0; width: 100vw; height: 100vh;
  z-index: 0; pointer-events: none; opacity: .88;
}
html[data-theme="light"] .webgl-bg { opacity: .42; }
.aurora span {
  position: absolute; border-radius: 50%; filter: blur(90px); opacity: .5;
}
.aurora span:nth-child(1) {
  width: 46vw; height: 46vw; top: -14vw; left: -8vw;
  background: radial-gradient(circle, rgba(124, 92, 255, .55), transparent 68%);
  animation: drift-a 26s var(--ease) infinite alternate;
}
.aurora span:nth-child(2) {
  width: 38vw; height: 38vw; top: 26vh; right: -10vw;
  background: radial-gradient(circle, rgba(34, 211, 238, .4), transparent 68%);
  animation: drift-b 32s var(--ease) infinite alternate;
}
.aurora span:nth-child(3) {
  width: 30vw; height: 30vw; bottom: -6vw; left: 32vw;
  background: radial-gradient(circle, rgba(255, 180, 84, .26), transparent 70%);
  animation: drift-c 38s var(--ease) infinite alternate;
}
html[data-theme="light"] .aurora span { opacity: .34; }

@keyframes drift-a { to { transform: translate3d(6vw, 5vh, 0) scale(1.14); } }
@keyframes drift-b { to { transform: translate3d(-7vw, -4vh, 0) scale(1.1); } }
@keyframes drift-c { to { transform: translate3d(4vw, -6vh, 0) scale(1.2); } }

.grain {
  position: fixed; inset: 0; z-index: 60; pointer-events: none; opacity: .035;
  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='.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)'/%3E%3C/svg%3E");
}
html[data-theme="light"] .grain { opacity: .05; }

/* ── 导航：悬浮玻璃胶囊 ─────────────────────────── */
.nav {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; gap: 1.25rem;
  max-width: var(--shell); margin: 1.5rem auto 0; padding: .625rem .625rem .625rem 1.125rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  backdrop-filter: blur(22px) saturate(160%);
  -webkit-backdrop-filter: blur(22px) saturate(160%);
  transition: transform .7s var(--ease), box-shadow .7s var(--ease), border-color .5s var(--ease);
}
.nav.is-scrolled {
  box-shadow: 0 24px 60px -28px rgba(0, 0, 0, .75);
  border-color: var(--line-2);
}

.nav-brand { display: flex; align-items: center; gap: .7rem; text-decoration: none; color: inherit; flex-shrink: 0; }
.brand-orb { position: relative; width: 30px; height: 30px; display: grid; place-items: center; }
.brand-orb i {
  position: absolute; border-radius: 50%; border: 1px solid var(--line-2);
}
.brand-orb i:nth-child(1) { width: 30px; height: 30px; border-color: color-mix(in srgb, var(--violet) 55%, transparent); animation: orb 9s linear infinite; }
.brand-orb i:nth-child(2) { width: 19px; height: 19px; border-color: color-mix(in srgb, var(--cyan) 55%, transparent); animation: orb 7s linear infinite reverse; }
.brand-orb i:nth-child(3) { width: 7px; height: 7px; background: var(--cyan); border: 0; box-shadow: 0 0 14px var(--cyan); }
@keyframes orb { to { transform: rotate(360deg); } }

.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-text strong { font-size: .98rem; font-weight: 700; letter-spacing: -.02em; }
.brand-text strong em { font-style: normal; color: var(--violet); }
.brand-text small { font-size: .62rem; color: var(--muted); letter-spacing: .1em; text-transform: uppercase; }

.nav-links { display: flex; gap: 1.35rem; margin-left: auto; }
.nav-links a {
  color: var(--ink-2); text-decoration: none; font-size: .875rem; font-weight: 500;
  position: relative; padding: .3rem 0;
  transition: color .45s var(--ease);
}
.nav-links a::after {
  content: ""; position: absolute; left: 0; bottom: 0; height: 1px; width: 100%;
  background: var(--cyan); transform: scaleX(0); transform-origin: right;
  transition: transform .6s var(--ease);
}
.nav-links a:hover { color: var(--ink); }
.nav-links a:hover::after { transform: scaleX(1); transform-origin: left; }

.nav-actions { display: flex; align-items: center; gap: .5rem; margin-left: auto; }

.icon-btn {
  width: 38px; height: 38px; display: grid; place-items: center;
  border: 1px solid var(--line); border-radius: 50%; background: transparent;
  color: var(--ink-2); cursor: pointer;
  transition: color .4s var(--ease), border-color .4s var(--ease), transform .5s var(--ease);
}
.icon-btn:hover { color: var(--ink); border-color: var(--line-2); transform: rotate(18deg); }
.icon-btn svg { width: 17px; height: 17px; fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; }
.i-moon { display: none; }
html[data-theme="light"] .i-sun { display: none; }
html[data-theme="light"] .i-moon { display: block; }

.btn {
  display: inline-flex; align-items: center; gap: .55rem;
  padding: .55rem 1rem; border-radius: 999px;
  font-size: .85rem; font-weight: 600; text-decoration: none;
  border: 1px solid transparent; cursor: pointer; white-space: nowrap;
  transition: transform .55s var(--ease), background .5s var(--ease),
              border-color .5s var(--ease), color .5s var(--ease), box-shadow .6s var(--ease);
}
.btn:active { transform: scale(.975); }
.btn-solid { background: var(--ink); color: var(--bg); }
.btn-solid:hover { box-shadow: 0 14px 34px -14px color-mix(in srgb, var(--ink) 60%, transparent); }
.btn-primary {
  background: linear-gradient(120deg, var(--violet), var(--cyan));
  color: #fff; box-shadow: 0 18px 44px -20px rgba(124, 92, 255, .8);
}
.btn-primary:hover { box-shadow: 0 24px 54px -18px rgba(124, 92, 255, .95); transform: translateY(-2px); }
.btn-outline { border-color: var(--line-2); color: var(--ink); background: var(--card); }
.btn-outline:hover { border-color: var(--cyan); color: var(--cyan); }
.btn-ghost { border-color: var(--line); color: var(--ink-2); }
.btn-ghost:hover { color: var(--ink); border-color: var(--line-2); }

.btn-orb {
  width: 22px; height: 22px; display: grid; place-items: center; border-radius: 50%;
  background: rgba(255, 255, 255, .16); font-size: .7rem;
  transition: transform .55s var(--ease);
}
.btn:hover .btn-orb { transform: translate(2px, -2px) scale(1.1); }

.menu-btn {
  display: none; width: 38px; height: 38px; position: relative;
  border: 1px solid var(--line); border-radius: 50%; background: transparent; cursor: pointer;
}
.menu-btn span {
  position: absolute; left: 50%; width: 15px; height: 1.5px; background: var(--ink);
  transition: transform .55s var(--ease), opacity .4s var(--ease);
}
.menu-btn span:nth-child(1) { top: 15px; transform: translateX(-50%); }
.menu-btn span:nth-child(2) { top: 21px; transform: translateX(-50%); }
.menu-btn[aria-expanded="true"] span:nth-child(1) { top: 18px; transform: translateX(-50%) rotate(45deg); }
.menu-btn[aria-expanded="true"] span:nth-child(2) { top: 18px; transform: translateX(-50%) rotate(-45deg); }

.nav-mobile { display: none; }

/* ── 通用容器 ───────────────────────────────────── */
main { position: relative; z-index: 1; }
.section, .hero, .stats, .footer { max-width: var(--shell); margin-inline: auto; padding-inline: 1.5rem; }

.section { padding-block: 7.5rem; }

.eyebrow, .mini, .sec-num, .card-k, .badge-k, .step-n {
  font-family: var(--mono); text-transform: uppercase; letter-spacing: .18em;
}
.eyebrow {
  display: inline-flex; align-items: center; gap: .55rem;
  font-size: .68rem; color: var(--muted); margin: 0 0 1.5rem;
  padding: .35rem .8rem; border: 1px solid var(--line); border-radius: 999px;
  background: var(--card);
}
.pulse {
  width: 6px; height: 6px; border-radius: 50%; background: var(--green);
  box-shadow: 0 0 0 0 color-mix(in srgb, var(--green) 70%, transparent);
  animation: pulse 2.4s var(--ease) infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--green) 60%, transparent); }
  70% { box-shadow: 0 0 0 9px transparent; }
  100% { box-shadow: 0 0 0 0 transparent; }
}

h1, h2, h3 { letter-spacing: -.035em; margin: 0; font-weight: 700; }
h1 { font-size: clamp(2.6rem, 6.2vw, 4.6rem); line-height: 1.04; }
h2 { font-size: clamp(1.85rem, 3.6vw, 2.9rem); line-height: 1.12; }
h3 { font-size: 1.06rem; }

.grad {
  background: linear-gradient(100deg, var(--violet) 8%, var(--cyan) 62%, var(--amber));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}

/* ── HERO ───────────────────────────────────────── */
.hero {
  display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr); gap: 4.5rem;
  align-items: center; padding-block: 6rem 5rem;
}
.hero-copy { max-width: 34rem; }
.lede { font-size: 1.06rem; color: var(--ink-2); margin: 1.75rem 0 0; line-height: 1.75; }
.hero-cta { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 2.25rem; }
.hero-note {
  display: flex; align-items: center; gap: .7rem; margin: 2rem 0 0;
  font-size: .8rem; color: var(--muted);
}
.note-rule { width: 34px; height: 1px; background: linear-gradient(90deg, var(--violet), transparent); }

/* 舞台（双层嵌套容器）*/
.hero-visual { position: relative; }
.stage {
  position: relative; padding: 1.1rem;
  border: 1px solid var(--line); border-radius: var(--r-lg);
  background: var(--card);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .07), 0 40px 90px -50px rgba(0, 0, 0, .9);
}
.stage-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 1rem; padding: .35rem .5rem 1rem; }
.mini { font-size: .6rem; color: var(--muted); margin: 0 0 .4rem; }
.stage-head h2 { font-size: 1.02rem; letter-spacing: -.02em; }
.live {
  display: inline-flex; align-items: center; gap: .45rem; flex-shrink: 0;
  font-family: var(--mono); font-size: .58rem; letter-spacing: .16em; color: var(--green);
  padding: .3rem .6rem; border: 1px solid color-mix(in srgb, var(--green) 32%, transparent);
  border-radius: 999px; background: color-mix(in srgb, var(--green) 9%, transparent);
}
canvas[data-graph] {
  display: block; width: 100%; height: 340px; border-radius: var(--r-md);
  background:
    radial-gradient(circle at 30% 28%, color-mix(in srgb, var(--violet) 20%, transparent), transparent 46%),
    radial-gradient(circle at 74% 68%, color-mix(in srgb, var(--cyan) 16%, transparent), transparent 50%),
    var(--bg-2);
  cursor: grab; touch-action: none;
}
canvas[data-graph]:active { cursor: grabbing; }
canvas[data-graph]:focus-visible { outline: 2px solid var(--cyan); outline-offset: -4px; }
.stage-foot {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: .85rem .5rem .25rem; font-size: .74rem; color: var(--muted);
}
.stage-actions {
  display: flex; align-items: center; gap: .45rem;
}
.chip-btn {
  font-family: var(--mono); font-size: .6rem; letter-spacing: .12em; text-transform: uppercase;
  padding: .35rem .7rem; border: 1px solid var(--line-2); border-radius: 999px;
  background: transparent; color: var(--ink-2); cursor: pointer;
  transition: color .4s var(--ease), border-color .4s var(--ease), background .4s var(--ease);
}
.chip-btn:hover { color: var(--cyan); border-color: var(--cyan); }
.chip-btn.is-active { color: var(--cyan); border-color: var(--cyan); background: color-mix(in srgb, var(--cyan) 14%, transparent); }

/* 3D 全屏沉浸模式 */
.stage.is-expanded {
  position: fixed; inset: 1.5rem; z-index: 60;
  max-width: 1400px; margin: auto; height: calc(100vh - 3rem);
  background: color-mix(in srgb, var(--bg) 94%, transparent);
  backdrop-filter: blur(28px); -webkit-backdrop-filter: blur(28px);
  box-shadow: 0 30px 100px rgba(0, 0, 0, .9);
  display: flex; flex-direction: column;
}
.stage.is-expanded canvas[data-graph] {
  flex: 1; height: 100%; min-height: 0;
}

.stage-badge {
  position: absolute; left: -1.75rem; bottom: -1.75rem;
  display: grid; gap: .2rem; padding: .95rem 1.15rem;
  border: 1px solid var(--line-2); border-radius: var(--r-md);
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);
  box-shadow: 0 26px 60px -30px rgba(0, 0, 0, .85);
  transition: transform .6s var(--ease);
}
.badge-k { font-size: .56rem; color: var(--violet); letter-spacing: .2em; }
.stage-badge strong { font-size: 1.02rem; letter-spacing: -.02em; }
.stage-badge small { font-size: .74rem; color: var(--muted); }

/* ── STATS ──────────────────────────────────────── */
.stats {
  display: grid; grid-template-columns: repeat(5, 1fr); gap: 1px;
  padding: 0; margin-block: 3rem 2rem;
  border: 1px solid var(--line); border-radius: var(--r-lg);
  background: var(--line); overflow: hidden;
}
.stat {
  display: grid; gap: .2rem; padding: 1.9rem 1.5rem;
  background: var(--bg); text-align: left;
}
.stat b {
  font-size: clamp(1.9rem, 3.4vw, 2.6rem); font-weight: 700; letter-spacing: -.045em;
  font-variant-numeric: tabular-nums;
  background: linear-gradient(160deg, var(--ink), color-mix(in srgb, var(--violet) 70%, var(--ink)));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.stat span { font-size: .84rem; color: var(--ink-2); font-weight: 500; }
.stat small { font-size: .68rem; color: var(--muted); }

/* ── 分区标题 ───────────────────────────────────── */
.sec-head { max-width: 42rem; margin-bottom: 3.5rem; }
.sec-num { font-size: .64rem; color: var(--violet); margin: 0 0 1rem; }
.sec-head h2 { margin-bottom: 1rem; }
.sec-sub { color: var(--ink-2); margin: 0; font-size: 1rem; }
.sec-sub b { color: var(--ink); }

/* ── SPLIT 布局 ─────────────────────────────────── */
.split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 4.5rem; align-items: center; }
.split-intro h2 { margin-bottom: 1.25rem; }
.split-intro > p { color: var(--ink-2); margin: 0 0 1.75rem; }
.ticks { list-style: none; padding: 0; margin: 0 0 1.75rem; display: grid; gap: .7rem; }
.ticks li { display: flex; align-items: baseline; gap: .6rem; font-size: .9rem; color: var(--ink-2); }
.ticks li::before {
  content: ""; width: 5px; height: 5px; border-radius: 50%; flex-shrink: 0;
  background: var(--cyan); box-shadow: 0 0 10px var(--cyan); transform: translateY(-2px);
}
.ticks b { color: var(--ink); font-weight: 700; }
.text-link {
  display: inline-flex; align-items: center; gap: .4rem;
  color: var(--cyan); text-decoration: none; font-size: .88rem; font-weight: 600;
  border-bottom: 1px solid color-mix(in srgb, var(--cyan) 32%, transparent);
  padding-bottom: .15rem; transition: gap .5s var(--ease), border-color .5s var(--ease);
}
.text-link:hover { gap: .7rem; border-color: var(--cyan); }

/* ── 面板（终端风双层容器）──────────────────────── */
.panel {
  padding: .85rem; border: 1px solid var(--line); border-radius: var(--r-lg);
  background: var(--card);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .06), 0 36px 80px -46px rgba(0, 0, 0, .9);
}
.panel-bar { display: flex; align-items: center; gap: .35rem; padding: .3rem .45rem .85rem; }
.panel-bar span { width: 8px; height: 8px; border-radius: 50%; background: var(--line-2); }
.panel-bar span:nth-child(1) { background: color-mix(in srgb, var(--amber) 60%, transparent); }
.panel-bar span:nth-child(2) { background: color-mix(in srgb, var(--green) 55%, transparent); }
.panel-bar small { margin-left: auto; font-family: var(--mono); font-size: .62rem; color: var(--muted); }

.tree {
  display: grid; gap: .2rem; padding: .75rem; border-radius: var(--r-md);
  background: var(--bg-2); border: 1px solid var(--line);
}
.tree-row {
  display: flex; align-items: center; gap: .6rem;
  padding: .48rem .6rem; border-radius: var(--r-sm);
  font-size: .82rem; font-family: var(--mono);
  transition: background .45s var(--ease), transform .45s var(--ease);
}
.tree-row:hover { background: var(--card-2); transform: translateX(4px); }
.tree-row i {
  width: 5px; height: 5px; border-radius: 50%; flex-shrink: 0;
  background: var(--muted);
}
.tree-row.l0 i { background: var(--violet); box-shadow: 0 0 10px var(--violet); }
.tree-row.l0 b { color: var(--ink); }
.tree-row.l1 { margin-left: .85rem; }
.tree-row.l1 i { background: var(--cyan); }
.tree-row.l2 { margin-left: 1.7rem; }
.tree-row.l2 i { background: var(--amber); }
.tree-row b { font-weight: 500; color: var(--ink-2); }
.tree-row em { margin-left: auto; font-style: normal; font-size: .7rem; color: var(--muted); }
.tree-row.dim { opacity: .55; }

/* ── 3D 立体分层解构 ────────────────────────────── */
.stack-toggles { display: flex; gap: .35rem; margin-left: auto; }
.stack-3d-wrap {
  perspective: 1200px; padding: .65rem .2rem;
}
.stack-3d {
  display: grid; gap: .85rem;
  transform: rotateX(22deg) rotateY(-14deg) rotateZ(2deg);
  transform-style: preserve-3d;
  transition: transform .6s var(--ease);
}
.stack-3d:hover {
  transform: rotateX(12deg) rotateY(-6deg) rotateZ(1deg);
}
.layer-card {
  padding: 1.15rem 1.3rem; border-radius: var(--r-md);
  border: 1px solid var(--line-2);
  background: color-mix(in srgb, var(--bg-2) 90%, transparent);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 20px 40px -15px rgba(0, 0, 0, .75);
  transition: transform .45s var(--ease), border-color .35s var(--ease), box-shadow .45s var(--ease);
  cursor: pointer;
}
.layer-card:hover {
  border-color: var(--cyan);
  box-shadow: 0 24px 50px -10px color-mix(in srgb, var(--cyan) 25%, transparent);
}
.layer-card.layer-3 {
  transform: translateZ(36px);
  border-color: color-mix(in srgb, var(--violet) 45%, var(--line));
}
.layer-card.layer-2 {
  transform: translateZ(18px);
  border-color: color-mix(in srgb, var(--cyan) 45%, var(--line));
}
.layer-card.layer-1 {
  transform: translateZ(0px);
  border-color: color-mix(in srgb, var(--amber) 45%, var(--line));
}
.layer-card.layer-3:hover { transform: translateZ(56px); }
.layer-card.layer-2:hover { transform: translateZ(38px); }
.layer-card.layer-1:hover { transform: translateZ(20px); }

.layer-tag {
  font-family: var(--mono); font-size: .62rem; letter-spacing: .16em; text-transform: uppercase;
  color: var(--cyan); margin-bottom: .35rem; display: inline-block;
}
.layer-card.layer-3 .layer-tag { color: var(--violet); }
.layer-card.layer-1 .layer-tag { color: var(--amber); }
.layer-card h4 { margin: 0 0 .3rem; font-size: .95rem; font-weight: 600; letter-spacing: -.02em; }
.layer-card p { margin: 0; font-size: .8rem; color: var(--ink-2); line-height: 1.5; }

.jobs { display: grid; gap: .2rem; padding: .75rem; border-radius: var(--r-md); background: var(--bg-2); border: 1px solid var(--line); }
.job {
  display: flex; align-items: center; gap: .7rem; padding: .48rem .6rem;
  border-radius: var(--r-sm); font-size: .8rem; font-family: var(--mono);
  transition: background .45s var(--ease);
}
.job:hover { background: var(--card-2); }
.job b { font-weight: 500; color: var(--ink-2); }
.job span { margin-left: auto; font-size: .7rem; color: var(--muted); }
.job em {
  font-style: normal; font-size: .6rem; padding: .1rem .42rem; border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--green) 30%, transparent);
  color: var(--green); background: color-mix(in srgb, var(--green) 9%, transparent);
}
.job.dim { opacity: .55; }

/* ── 卡片网格 ───────────────────────────────────── */
.cards {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1.1rem;
  perspective: 1200px;
}
.card {
  display: grid; gap: .55rem; padding: 1.6rem 1.5rem 1.4rem;
  border: 1px solid var(--line); border-radius: var(--r-lg);
  background: var(--card); position: relative; overflow: hidden;
  transform-style: preserve-3d;
  transition: transform .6s var(--ease), border-color .5s var(--ease), background .5s var(--ease), box-shadow .5s var(--ease);
}
.card::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(circle at var(--mx, 20%) var(--my, 0%), color-mix(in srgb, var(--violet) 22%, transparent), transparent 60%);
  opacity: 0; transition: opacity .6s var(--ease);
}
.card:hover { transform: translateY(-6px); border-color: var(--line-2); box-shadow: 0 20px 48px -20px rgba(124, 92, 255, .3); }
.card:hover::before { opacity: 1; }
.card > * { position: relative; }
.card-k { font-size: .58rem; color: var(--violet); }
.card h3 { font-size: 1rem; }
.card p { margin: 0; font-size: .85rem; color: var(--ink-2); line-height: 1.6; }
.card small { font-family: var(--mono); font-size: .64rem; color: var(--muted); }

.meter { height: 3px; border-radius: 999px; background: var(--line); overflow: hidden; margin-top: .3rem; }
.meter i {
  display: block; height: 100%; width: 0;
  background: linear-gradient(90deg, var(--violet), var(--cyan));
  transition: width 1.2s var(--ease);
}
.meter.is-on i { width: var(--w); }

.card-loop { background: linear-gradient(150deg, color-mix(in srgb, var(--violet) 12%, var(--card)), var(--card)); }
.loop-tag {
  font-family: var(--mono); font-size: .58rem; letter-spacing: .14em; text-transform: uppercase;
  color: var(--amber); border: 1px solid color-mix(in srgb, var(--amber) 30%, transparent);
  padding: .16rem .5rem; border-radius: 999px; width: max-content;
}

/* ── 自举演化剖析面板 ────────────────────────────── */
.card.is-active {
  border-color: var(--cyan);
  box-shadow: 0 0 0 1px var(--cyan), 0 24px 60px -20px color-mix(in srgb, var(--cyan) 35%, transparent);
}
.card.is-active .card-k { color: var(--cyan); }

.bootstrap-inspector {
  margin-top: 1.5rem; padding: 1.25rem 1.5rem;
  border: 1px solid var(--line-2); border-radius: var(--r-lg);
  background: color-mix(in srgb, var(--bg-2) 92%, transparent);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .08), 0 30px 80px -40px rgba(0, 0, 0, .9);
}
.inspector-topbar {
  display: flex; align-items: center; gap: .7rem; padding-bottom: 1rem;
  border-bottom: 1px solid var(--line); font-family: var(--mono);
}
.inspector-title { font-size: .86rem; font-weight: 600; color: var(--ink); }
.inspector-badge {
  margin-left: auto; font-size: .6rem; letter-spacing: .16em;
  padding: .2rem .55rem; border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--cyan) 35%, transparent);
  background: color-mix(in srgb, var(--cyan) 10%, transparent); color: var(--cyan);
}
.inspector-content {
  display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center; gap: 1rem; margin-top: 1rem;
}
.diff-block {
  display: grid; gap: .35rem; padding: 1rem 1.15rem; border-radius: var(--r-md);
  border: 1px solid var(--line); background: var(--card); min-width: 0;
}
.diff-label { font-family: var(--mono); font-size: .64rem; letter-spacing: .12em; text-transform: uppercase; }
.diff-pain .diff-label { color: #f43f5e; }
.diff-rule .diff-label { color: var(--amber); }
.diff-solid .diff-label { color: var(--green); }
.diff-block p { margin: 0; font-size: .84rem; color: var(--ink-2); line-height: 1.55; word-break: break-word; }
.diff-block code { font-family: var(--mono); font-size: .74rem; color: var(--cyan); background: var(--card-2); padding: .1rem .35rem; border-radius: 4px; }
.diff-arrow { font-size: 1.1rem; color: var(--muted); opacity: .6; text-align: center; }

/* ── 知识域搜索 & 筛选 ───────────────────────────── */
.domain-filter-bar {
  display: grid; gap: 1rem; margin-bottom: 2rem;
}
.search-input-wrap {
  position: relative; display: flex; align-items: center; width: 100%;
}
.search-icon {
  position: absolute; left: 1rem; width: 18px; height: 18px; fill: none;
  stroke: var(--muted); stroke-width: 1.7; stroke-linecap: round; pointer-events: none;
}
.search-input {
  width: 100%; padding: .85rem 2.8rem; border-radius: 999px;
  border: 1px solid var(--line); background: var(--card);
  color: var(--ink); font-family: var(--font); font-size: .9rem;
  transition: border-color .4s var(--ease), box-shadow .4s var(--ease);
}
.search-input:focus {
  outline: none; border-color: var(--cyan);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--cyan) 18%, transparent);
}
.search-clear {
  position: absolute; right: 1rem; width: 22px; height: 22px; border-radius: 50%;
  border: 1px solid var(--line-2); background: transparent; color: var(--muted);
  font-size: 1rem; line-height: 1; cursor: pointer; display: grid; place-items: center;
}
.search-clear:hover { color: var(--ink); border-color: var(--cyan); }
.filter-tags { display: flex; flex-wrap: wrap; gap: .45rem; }
.tag-btn {
  font-family: var(--mono); font-size: .68rem; letter-spacing: .06em;
  padding: .35rem .85rem; border-radius: 999px; border: 1px solid var(--line);
  background: var(--card); color: var(--ink-2); cursor: pointer;
  transition: all .35s var(--ease);
}
.tag-btn:hover { border-color: var(--line-2); color: var(--ink); }
.tag-btn.is-active {
  border-color: var(--cyan); background: color-mix(in srgb, var(--cyan) 14%, transparent); color: var(--cyan);
}

/* ── 自动化时间轴雷达 ────────────────────────────── */
.cron-radar-wrap {
  margin-top: .85rem; padding: .95rem 1rem; border-radius: var(--r-md);
  border: 1px solid var(--line); background: var(--bg-2);
}
.radar-header { display: flex; align-items: center; justify-content: space-between; font-family: var(--mono); margin-bottom: .75rem; }
.radar-live { display: inline-flex; align-items: center; gap: .45rem; font-size: .6rem; letter-spacing: .16em; color: var(--cyan); }
.radar-clock { font-size: .6rem; color: var(--muted); letter-spacing: .12em; }
.radar-timeline {
  display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: .4rem;
}
.timeline-slot {
  display: grid; gap: .15rem; padding: .5rem .4rem; border-radius: var(--r-sm);
  border: 1px solid var(--line); background: var(--card); text-align: center;
  transition: transform .35s var(--ease), border-color .35s var(--ease);
}
.timeline-slot:hover { border-color: var(--line-2); transform: translateY(-2px); }
.timeline-slot.active {
  border-color: var(--cyan); background: color-mix(in srgb, var(--cyan) 12%, transparent);
}
.timeline-slot span { font-family: var(--mono); font-size: .62rem; color: var(--muted); }
.timeline-slot.active span { color: var(--cyan); }
.timeline-slot b { font-size: .72rem; font-weight: 600; color: var(--ink-2); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.timeline-slot.active b { color: var(--ink); }

/* ── 知识域网格 ─────────────────────────────────── */
.dom-grid { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--r-lg); overflow: hidden; }
.dom {
  display: grid; gap: .3rem; padding: 1.35rem 1.1rem; background: var(--bg);
  text-decoration: none; color: inherit; position: relative;
  transition: background .55s var(--ease);
}
.dom:hover { background: var(--bg-2); }
.dom strong { font-size: .92rem; font-weight: 600; letter-spacing: -.02em; }
.dom span { font-family: var(--mono); font-size: .68rem; color: var(--muted); }
.dom-desc {
  font-size: .72rem; color: var(--muted); line-height: 1.35;
  margin-top: .15rem; display: -webkit-box; -webkit-line-clamp: 1; -webkit-box-orient: vertical; overflow: hidden;
}
.dom i {
  height: 2px; border-radius: 999px; background: var(--line);
  overflow: hidden; margin-top: .35rem;
}
.dom i::after {
  content: ""; display: block; height: 100%; width: var(--w, 10%);
  background: linear-gradient(90deg, var(--violet), var(--cyan));
}

/* ── 快速开始 ───────────────────────────────────── */
.start-grid {
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1.1rem;
  perspective: 1200px;
}
.step {
  display: grid; gap: .7rem; padding: 1.75rem 1.6rem;
  border: 1px solid var(--line); border-radius: var(--r-lg); background: var(--card);
  min-width: 0;
  transform-style: preserve-3d;
  transition: transform .6s var(--ease), border-color .5s var(--ease), box-shadow .5s var(--ease);
}
.step:hover { transform: translateY(-5px); border-color: var(--line-2); box-shadow: 0 20px 48px -20px rgba(34, 211, 238, .25); }
.step-n {
  width: 34px; height: 34px; display: grid; place-items: center; border-radius: 50%;
  font-size: .72rem; color: var(--cyan);
  border: 1px solid color-mix(in srgb, var(--cyan) 34%, transparent);
  background: color-mix(in srgb, var(--cyan) 9%, transparent);
}
.step h3 { font-size: 1rem; }
.step p { margin: 0; font-size: .85rem; color: var(--ink-2); }
.code {
  display: flex; align-items: center; gap: .6rem;
  padding: .7rem .8rem; border-radius: var(--r-sm);
  background: var(--bg-2); border: 1px solid var(--line);
  min-width: 0; overflow: hidden;
}
.code code {
  font-family: var(--mono); font-size: .72rem; color: var(--ink-2);
  overflow-x: auto; white-space: nowrap; flex: 1 1 0; min-width: 0;
  scrollbar-width: none;
}
.code code::-webkit-scrollbar { display: none; }
.code button {
  flex-shrink: 0; font-family: var(--mono); font-size: .6rem; letter-spacing: .1em;
  text-transform: uppercase; padding: .28rem .55rem; border-radius: 999px;
  border: 1px solid var(--line-2); background: transparent; color: var(--muted);
  cursor: pointer; transition: color .4s var(--ease), border-color .4s var(--ease);
}
.code button:hover { color: var(--cyan); border-color: var(--cyan); }

.start-cta { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 2.5rem; justify-content: center; }

/* ── 页脚 ───────────────────────────────────────── */
.footer {
  position: relative; z-index: 1;
  display: grid; gap: 1.5rem; padding-block: 3.5rem 4rem;
  border-top: 1px solid var(--line); margin-top: 3rem;
}
.foot-brand { display: flex; align-items: center; gap: .8rem; }
.foot-brand div { display: flex; flex-direction: column; line-height: 1.25; }
.foot-brand strong { font-size: .95rem; }
.foot-brand small { font-size: .74rem; color: var(--muted); }
.foot-links { display: flex; flex-wrap: wrap; gap: 1.4rem; }
.foot-links a {
  color: var(--ink-2); text-decoration: none; font-size: .85rem;
  transition: color .45s var(--ease);
}
.foot-links a:hover { color: var(--cyan); }
.foot-bottom { margin: 0; font-size: .74rem; color: var(--muted); }

/* ── 进入动画 ───────────────────────────────────── */
.reveal {
  opacity: 0; transform: translateY(28px); filter: blur(6px);
  transition: opacity .9s var(--ease), transform .9s var(--ease), filter .9s var(--ease);
}
.reveal.is-in { opacity: 1; transform: none; filter: none; }

/* ── 响应式 ─────────────────────────────────────── */
@media (max-width: 1080px) {
  .cards { grid-template-columns: repeat(2, 1fr); }
  .dom-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 860px) {
  .nav { margin: 1rem .9rem 0; padding: .5rem .5rem .5rem .85rem; gap: .5rem; }
  .nav-links, .nav-kb { display: none; }
  .menu-btn { display: block; flex-shrink: 0; }
  .nav-actions { margin-left: auto; gap: .4rem; }
  .brand-text small { display: none; }
  /* 移动端只留「主题 + 菜单」两个按钮，避免挤压菜单按钮导致不可点 */
  .nav-actions .btn-solid { display: none; }
  .nav-mobile {
    position: fixed; inset: 0; z-index: 50; display: grid; align-content: center; gap: .35rem;
    padding: 2rem; background: color-mix(in srgb, var(--bg) 94%, transparent);
    backdrop-filter: blur(30px); -webkit-backdrop-filter: blur(30px);
    opacity: 0; visibility: hidden; transition: opacity .6s var(--ease), visibility .6s;
  }
  .nav-mobile.is-open { opacity: 1; visibility: visible; }
  .nav-mobile a {
    color: var(--ink); text-decoration: none; font-size: 1.5rem; font-weight: 600;
    padding: .6rem 0; border-bottom: 1px solid var(--line);
    opacity: 0; transform: translateY(20px);
    transition: opacity .7s var(--ease), transform .7s var(--ease), color .4s var(--ease);
  }
  .nav-mobile.is-open a { opacity: 1; transform: none; }
  .nav-mobile.is-open a:nth-child(1) { transition-delay: .08s; }
  .nav-mobile.is-open a:nth-child(2) { transition-delay: .14s; }
  .nav-mobile.is-open a:nth-child(3) { transition-delay: .2s; }
  .nav-mobile.is-open a:nth-child(4) { transition-delay: .26s; }
  .nav-mobile.is-open a:nth-child(5) { transition-delay: .32s; }
  .nav-mobile.is-open a:nth-child(6) { transition-delay: .38s; }
  body.menu-open { overflow: hidden; }

  .section { padding-block: 4.5rem; }
  .hero { grid-template-columns: 1fr; gap: 3rem; padding-block: 3.5rem; }
  .hero-copy { max-width: none; }
  .split, .split.rev { grid-template-columns: 1fr; gap: 2.75rem; }
  .split.rev .split-visual { order: 2; }
  .split.rev .split-intro { order: 1; }
  .stack-3d { transform: none !important; }
  .layer-card { transform: none !important; }
  .inspector-content {
    grid-template-columns: minmax(0, 1fr) !important;
    gap: .65rem !important;
  }
  .diff-arrow { transform: rotate(90deg); margin: -0.2rem 0; }
  .radar-timeline { grid-template-columns: repeat(3, minmax(0, 1fr)) !important; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stat:last-child { grid-column: span 2; }
  .cards { grid-template-columns: 1fr; }
  .start-grid { grid-template-columns: 1fr; }
  .dom-grid { grid-template-columns: repeat(2, 1fr); }
  .stage-badge { position: static; margin-top: 1rem; }
  canvas[data-graph] { height: 280px; }
  .stage { padding: .85rem; }
}

@media (max-width: 520px) {
  .section { padding-block: 3.5rem; }
  .stats { grid-template-columns: 1fr; }
  .stat:last-child { grid-column: span 1; }
  .dom-grid { grid-template-columns: 1fr; }
  .radar-timeline { grid-template-columns: repeat(2, minmax(0, 1fr)) !important; }
  canvas[data-graph] { height: 240px; }
  .nav-mobile a { font-size: 1.25rem; }
  /* 网格项默认 min-width:auto 会被 .code 的 nowrap 内容撑破 → 显式归零 */
  .cards, .start-grid, .dom-grid, .split, .hero { min-width: 0; }
  .card, .step, .dom, .split-intro, .split-visual { min-width: 0; }
  .step, .card { padding-inline: 1.15rem; }
  .code code { font-size: .68rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; filter: none; }
}