/* ==========================================================
   永忆官网 · 漂浮星群修复程序 · dark space + warm off-white
   zh-CN first. One authored moment: the live-write cycle.
   ========================================================== */

:root {
  --bg: #070c17;
  --bg-2: #0b1220;
  --bg-3: #101a2b;
  --ink: #e9e2d2;
  --ink-dim: #b6ac97;
  --ink-faint: #978e79;
  --cyan: #4fd0d8;
  --cyan-dim: #269fa8;
  --amber: #e8b45e;
  --amber-dim: #8f6a2e;
  --line: rgba(233, 226, 210, 0.12);
  --line-strong: rgba(79, 208, 216, 0.28);
  --radius: 12px;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", serif;
  --font-mono: "IBM Plex Mono", "SF Mono", "Fira Code", "Menlo", monospace;
  --focus: var(--amber);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: 16.5px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  caret-color: var(--amber);
}

::selection {
  background: rgba(79, 208, 216, 0.28);
  color: #ffffff;
}

body::-webkit-scrollbar { width: 10px; }
body::-webkit-scrollbar-track { background: var(--bg-2); }
body::-webkit-scrollbar-thumb {
  background: var(--bg-3);
  border-radius: 5px;
  border: 2px solid var(--bg-2);
}
body::-webkit-scrollbar-thumb:hover { background: var(--cyan-dim); }

a {
  color: var(--cyan);
  text-decoration: none;
  text-underline-offset: 3px;
}
a:hover { text-decoration: underline; }
a:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
  border-radius: 2px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 8px;
  background: var(--cyan);
  color: var(--bg);
  font-family: var(--font-mono);
  font-size: 12.5px;
  padding: 4px 10px;
  border-radius: 0 0 6px 0;
  z-index: 100;
}
.skip-link:focus {
  left: 0;
  outline: 2px solid var(--focus);
}

/* ── topbar ─────────────────────────────────────────────── */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(7, 12, 23, 0.97);
  border-bottom: 1px solid var(--line);
  
}
.topbar-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 13px 22px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.brand-mark { color: var(--cyan); display: inline-flex; }
.brand-name {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: -0.02em;
}
.brand-en {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--ink-dim);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.brand-tag {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-faint);
  display: none;
}
.topnav {
  margin-left: auto;
  display: flex;
  gap: 22px;
  font-family: var(--font-mono);
  font-size: 12px;
}
.topnav a { color: var(--ink-dim); }
.topnav a:hover { color: var(--cyan); text-decoration: none; }
@media (min-width: 720px) {
  .brand-tag { display: inline; }
}

/* ── hero ───────────────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 92vh;
  display: grid;
  grid-template-columns: minmax(0, 46%) minmax(0, 54%);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}
.hero-sky {
  position: absolute;
  inset: 0 0 0 8%;
  z-index: 0;
  overflow: hidden;
}
.hero-left {
  position: relative;
  z-index: 1;
  padding: 15vh 22px 80px 22px;
  max-width: 640px;
}
.hero-kicker {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0 0 22px 0;
}
.hero-title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(40px, 6.2vw, 76px);
  line-height: 1.12;
  letter-spacing: -0.022em;
  margin: 0 0 26px 0;
  max-width: 12em;
}
.hero-sub {
  font-size: clamp(16px, 1.6vw, 19px);
  color: var(--ink-dim);
  margin: 0 0 36px 0;
  max-width: 34ch;
}
.hero-cta {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 30px;
}
.cta-primary, .cta-ghost {
  font-family: var(--font-mono);
  font-size: 13.5px;
  padding: 10px 20px;
  border-radius: var(--radius);
}
.cta-primary {
  background: var(--cyan);
  color: var(--bg);
}
.cta-primary:hover { text-decoration: none; background: #63dce3; }
.cta-ghost {
  border: 1px solid var(--line-strong);
  color: var(--cyan);
}
.cta-ghost:hover { text-decoration: none; color: #63dce3; }
.hero-proof {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-faint);
  max-width: 40ch;
}

.digest {
  position: absolute;
  right: 22px;
  top: 15vh;
  bottom: 8vh;
  width: 320px;
  z-index: 1;
  pointer-events: none;
  display: flex;
  flex-direction: column;
  padding: 4px 0 0 22px;
  border-left: 1px solid var(--line-strong);
}
.digest-title {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--ink-dim);
  margin: 0 0 14px 0;
  letter-spacing: 0.08em;
}
.digest-list {
  list-style: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  flex: 1;
}
.digest-list li {
  font-family: var(--font-mono);
  font-size: 12.3px;
  line-height: 1.55;
  color: var(--ink-dim);
  padding: 10px 6px 10px 0;
  border-bottom: 1px dashed rgba(233, 226, 210, 0.08);
  animation: digest-in 0.42s cubic-bezier(0.22, 1, 0.36, 1) both;
}
.digest-list li strong { color: var(--ink); font-weight: 600; }
.digest-list li.is-live  strong { color: var(--amber); }
.digest-list li.is-cyan  strong { color: var(--cyan); }
.digest-list li.is-old   strong { color: var(--ink-faint); }
@keyframes digest-in {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}
.digest-foot {
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-faint);
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  align-items: center;
  line-height: 1.5;
}
@media (max-width: 860px) {
  .hero { grid-template-columns: 1fr; min-height: auto; }
  .hero-sky { opacity: 0.42; inset: 0; }
  .topnav { gap: 14px; }
  .topnav a { white-space: nowrap; }
  .brand-en { display: none; }
  .hero-left { padding: 10vh 22px 40px; }
  .digest {
    position: relative;
    right: auto;
    top: auto;
    width: auto;
    border-left: none;
    border-top: 1px solid var(--line-strong);
    padding: 14px 22px 22px;
    max-height: 340px;
  }
  .digest-foot { justify-content: center; }
}

/* ── sections shared ────────────────────────────────────── */
.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 72px 22px 80px;
}
.sec-head { margin-bottom: 40px; max-width: 62ch; }
.sec-num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--cyan);
  margin: 0 0 8px 0;
  letter-spacing: 0.14em;
}
.sec-title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(28px, 3.2vw, 44px);
  line-height: 1.18;
  letter-spacing: -0.02em;
  margin: 0 0 14px 0;
}
.sec-lead { color: var(--ink-dim); }

/* ── layers ─────────────────────────────────────────────── */
.layers { background: var(--bg-2); border-bottom: 1px solid var(--line); }
.layer-stack {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 26px;
}
.layer {
  padding: 20px 22px 24px;
  border: 1px solid rgba(233, 226, 210, 0.09);
  border-radius: var(--radius);
  background: rgba(16, 26, 43, 0.55);
}
.layer-bar {
  height: 5px;
  background: rgba(233, 226, 210, 0.08);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 18px;
}
.layer-fill {
  display: block;
  height: 100%;
  width: var(--w);
  background: linear-gradient(90deg, var(--cyan-dim), var(--cyan));
  border-radius: 3px;
}
.layer-roadmap .layer-fill { opacity: 0.42; }
.layer-meta h3 {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 600;
  color: var(--cyan);
  margin: 0 0 8px 0;
  letter-spacing: 0.02em;
}
.layer-roadmap .layer-meta h3 { color: var(--ink-dim); }
.layer-meta p {
  margin: 0;
  color: var(--ink-dim);
  max-width: 68ch;
}
.layer-roadmap .layer-meta p { color: var(--ink-faint); }

/* ── recall lanes ─────────────────────────────────────────── */
.recall { border-bottom: 1px solid var(--line); }
.lanes {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}
.lane {
  padding: 20px 0 0;
  border-top: 2px solid var(--cyan);
}
.lane-head {
  margin-bottom: 12px;
}
.lane-head h3 {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 6px 0;
}
.lane-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--cyan);
  letter-spacing: 0.06em;
}
.lane p { color: var(--ink-dim); max-width: 36ch; margin: 0; }
@media (max-width: 860px) {
  .lanes { grid-template-columns: 1fr; }
  .lane { border-top-color: var(--cyan-dim); padding: 18px 0 0; }
}

/* ── supersede demo ─────────────────────────────────────── */
.dedup { background: var(--bg-2); border-bottom: 1px solid var(--line); }
.supersede-demo {
  margin: 0 0 22px;
  padding: 24px;
  border: 1px solid rgba(233, 226, 210, 0.09);
  border-radius: var(--radius);
  background: rgba(16, 26, 43, 0.45);
}
.supersede-demo figcaption {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--ink-dim);
  margin-bottom: 18px;
  letter-spacing: 0.04em;
}
.sup-lanes { display: flex; flex-direction: column; gap: 14px; }
.sup-row {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 16px;
  align-items: start;
  padding: 12px 14px;
  border: 1px solid rgba(233, 226, 210, 0.08);
  border-radius: 10px;
  background: rgba(7, 12, 23, 0.55);
}
.sup-state {
  font-family: var(--font-mono);
  font-size: 11.5px;
  padding: 3px 0 0;
}
.sup-retired { color: var(--ink-faint); }
.sup-live { color: var(--amber); }
.sup-text { color: var(--ink-dim); }
.sup-old .sup-text { color: var(--ink-faint); }
.sup-arrow {
  display: flex;
  align-items: center;
  gap: 16px;
  color: var(--amber-dim);
  margin-left: 136px;
}
.sup-arrow-label {
  font-family: var(--font-mono);
  font-size: 11px;
  margin-right: 6px;
}
.dedup-note { color: var(--ink-dim); max-width: 60ch; }

/* ── metrics ─────────────────────────────────────────────── */
.metrics { border-bottom: 1px solid var(--line); }
.metric-card {
  padding: 22px 24px;
  border: 1px solid rgba(233, 226, 210, 0.09);
  border-radius: var(--radius);
  background: rgba(16, 26, 43, 0.45);
}
.metric-head {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--amber);
  margin-bottom: 18px;
  letter-spacing: 0.06em;
}
.metric-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  margin: 0;
}
.metric-grid dt {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--ink-dim);
  margin-bottom: 6px;
  letter-spacing: 0.05em;
}
.metric-grid dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink);
  line-height: 1.5;
}
.metric-grid dd small {
  display: block;
  color: var(--ink-faint);
  font-size: 11.5px;
}

/* ── start ──────────────────────────────────────────────── */
.start { border-bottom: 1px solid var(--line); }
.steps { display: flex; flex-direction: column; gap: 20px; }
.step {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 0 22px;
  align-items: start;
}
.step-num {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 32px;
  color: var(--cyan);
  margin: 0;
  line-height: 1;
  letter-spacing: -0.02em;
  opacity: 0.72;
}
.step-body p { margin: 0 0 10px 0; color: var(--ink-dim); }
.code {
  margin: 0;
  padding: 14px 16px;
  background: var(--bg-3);
  border: 1px solid rgba(233, 226, 210, 0.08);
  border-radius: 10px;
  overflow-x: auto;
}
.code code, .code pre, .code pre code {
  font-family: var(--font-mono);
  font-size: 13px;
  color: #d6e7ea;
  line-height: 1.65;
  white-space: pre;
}

/* ── license ────────────────────────────────────────────── */
.license { background: var(--bg-2); border-bottom: 1px solid var(--line); }
.license-inner { text-align: center; max-width: 62ch; }
.license-copy { color: var(--ink-dim); margin: 12px 0 10px; }
.license-more {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-faint);
}

/* ── footer ──────────────────────────────────────────────── */
.foot { border-top: 1px solid var(--line); }
.foot-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--ink-faint);
  padding: 18px 22px;
}
.foot-right { display: flex; gap: 12px; }
.foot-right a { color: var(--ink-dim); }
.foot-right a:hover { color: var(--cyan); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .digest-list li { animation: none; }
}