/* =========================================================
   盗墓笔记 · 纪年档案 — design system
   tomb-interior palette · bronze door · decade-gap passage
   ========================================================= */

:root {
  /* —— color —— */
  --ink:        #14110F;   /* 墨漆  charred lacquer   */
  --earth:      #1F1A15;   /* 墓土  tomb earth        */
  --earth-2:    #2A221C;   /* 陶土  raised umber      */
  --earth-3:    #34291F;   /* 砂岩  sandstone edge    */
  --patina:     #6FA48B;   /* 铜绿  oxidized bronze   */
  --patina-dim: #4A7A66;   /* 深铜绿                  */
  --patina-deep:#2F4E42;   /* 暗铜绿                  */
  --lamp:       #D4A24C;   /* 灯黄  oil-lamp amber    */
  --lamp-glow:  #E8BE6E;   /* 灯芯                    */
  --bone:       #E8DFD0;   /* 骨白  aged paper        */
  --bone-dim:   #A89F90;   /* 暗骨                    */
  --bone-faint: #6B6557;   /* 微骨                    */
  --seal:       #9C3A2C;   /* 印泥红  vermillion seal */
  --rule:       rgba(232, 223, 208, 0.12);
  --rule-strong:rgba(111, 164, 139, 0.32);

  /* —— type —— */
  --ff-display: "Cormorant Garamond", "Noto Serif SC", "STKaiti", "KaiTi", serif;
  --ff-body:    "Noto Serif SC", "Cormorant Garamond", "Songti SC", "STSong", "SimSun", serif;
  --ff-mono:    "IBM Plex Mono", "Sarasa Mono SC", "Consolas", "Courier New", monospace;

  /* —— rhythm —— */
  --maxw: 860px;
  --maxw-wide: 1120px;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --section-y: clamp(4.5rem, 10vw, 8rem);
}

/* —— reset / base —— */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--earth);
  color: var(--bone);
  font-family: var(--ff-body);
  font-weight: 400;
  font-size: clamp(16px, 1.05vw + 0.8rem, 18px);
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

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

:focus-visible {
  outline: 2px solid var(--patina);
  outline-offset: 3px;
  border-radius: 1px;
}

/* skip link */
.skip-link {
  position: absolute; left: 50%; top: -3rem;
  transform: translateX(-50%);
  background: var(--bone); color: var(--ink);
  padding: 0.5rem 1rem; font-family: var(--ff-mono); font-size: 0.8rem;
  z-index: 100; transition: top 0.2s;
}
.skip-link:focus { top: 0.75rem; }

/* —— typography —— */
.eyebrow {
  font-family: var(--ff-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--patina);
  margin: 0 0 1.25rem;
}
.eyebrow .cn { font-family: var(--ff-body); letter-spacing: 0.2em; text-transform: none; }

.display {
  font-family: var(--ff-display);
  font-weight: 300;
  line-height: 1.12;
  letter-spacing: -0.005em;
  color: var(--bone);
  margin: 0;
}
.display em { font-style: italic; color: var(--lamp); font-weight: 400; }

.h1 { font-size: clamp(2.4rem, 6vw, 4.2rem); }
.h2 { font-size: clamp(1.9rem, 4.2vw, 2.9rem); }
.h3 { font-size: clamp(1.3rem, 2.4vw, 1.7rem); font-weight: 500; }

.lede {
  font-size: clamp(1rem, 1.4vw, 1.18rem);
  color: var(--bone-dim);
  line-height: 1.8;
  max-width: 52ch;
}

.prose p { margin: 0 0 1.1rem; color: var(--bone-dim); }
.prose p:last-child { margin-bottom: 0; }

/* —— layout —— */
.section { padding: var(--section-y) var(--gutter); }
.container { max-width: var(--maxw); margin: 0 auto; }
.container-wide { max-width: var(--maxw-wide); margin: 0 auto; }

.hairline {
  height: 1px; border: 0;
  background: linear-gradient(to right, transparent, var(--rule-strong), transparent);
  margin: 0;
}

/* =========================================================
   nav
   ========================================================= */
.site-nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(10px);
  background: rgba(20, 17, 15, 0.72);
  border-bottom: 1px solid var(--rule);
}
.site-nav__inner {
  max-width: var(--maxw-wide); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.9rem var(--gutter);
  gap: 1rem;
}
.brand {
  display: flex; align-items: baseline; gap: 0.6rem;
  font-family: var(--ff-display);
  color: var(--bone);
}
.brand__mark {
  width: 0.42rem; height: 0.42rem; border-radius: 50%;
  background: var(--patina);
  box-shadow: 0 0 8px var(--patina);
  align-self: center;
}
.brand__name { font-size: 1.05rem; letter-spacing: 0.04em; }
.brand__name .cn { font-family: var(--ff-body); font-weight: 500; }
.brand__sub { font-family: var(--ff-mono); font-size: 0.65rem; letter-spacing: 0.22em; color: var(--bone-faint); text-transform: uppercase; }

.nav-links {
  display: flex; align-items: center; gap: clamp(0.8rem, 1.6vw, 1.8rem);
  list-style: none; margin: 0; padding: 0;
}
.nav-links a {
  font-size: 0.92rem; color: var(--bone-dim);
  transition: color 0.2s;
  position: relative;
}
.nav-links a:hover { color: var(--bone); }
.nav-links a::after {
  content: ""; position: absolute; left: 0; bottom: -6px;
  width: 0; height: 1px; background: var(--patina); transition: width 0.25s;
}
.nav-links a:hover::after { width: 100%; }
.nav-links .is-active { color: var(--patina); }

.nav-actions { display: flex; gap: 0.5rem; margin-left: 0.6rem; }
.btn {
  font-family: var(--ff-mono); font-size: 0.78rem; letter-spacing: 0.12em;
  padding: 0.5rem 1rem; border: 1px solid var(--rule-strong);
  color: var(--bone); transition: all 0.2s; border-radius: 1px;
}
.btn:hover { border-color: var(--patina); color: var(--patina); }
.btn--solid { background: var(--patina-deep); border-color: var(--patina-deep); color: var(--bone); }
.btn--solid:hover { background: var(--patina-dim); border-color: var(--patina-dim); color: var(--bone); }

.nav-toggle { display: none; }

/* =========================================================
   hero
   ========================================================= */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex; flex-direction: column; justify-content: space-between;
  padding: 6rem var(--gutter) 2rem;
  background:
    radial-gradient(120% 80% at 50% 110%, rgba(111,164,139,0.06), transparent 60%),
    radial-gradient(90% 60% at 50% 18%, rgba(212,162,76,0.05), transparent 70%),
    var(--earth);
  overflow: hidden;
}
.hero__grain {
  position: absolute; inset: 0; pointer-events: none; opacity: 0.4;
  background-image:
    radial-gradient(circle at 18% 30%, rgba(111,164,139,0.05) 0 1px, transparent 2px),
    radial-gradient(circle at 72% 60%, rgba(212,162,76,0.04) 0 1px, transparent 2px),
    radial-gradient(circle at 40% 80%, rgba(232,223,208,0.025) 0 1px, transparent 2px);
  background-size: 7px 7px, 11px 11px, 5px 5px;
}
.hero__top { position: relative; max-width: var(--maxw); margin: 0 auto; width: 100%; text-align: center; }
.hero__meta {
  font-family: var(--ff-mono); font-size: 0.72rem; letter-spacing: 0.3em;
  color: var(--bone-faint); text-transform: uppercase;
  margin: 1.6rem 0 0;
}
.hero__meta .sep { color: var(--patina-dim); margin: 0 0.6rem; }
.hero__sub { margin: 1.8rem auto 0; text-align: center; color: var(--bone-dim); max-width: 46ch; }

.hero__door-wrap {
  position: relative; margin: 0 auto; padding: 2rem 0 1rem;
  display: flex; flex-direction: column; align-items: center;
}
.hero__inscription {
  font-family: var(--ff-mono); font-size: 0.7rem; letter-spacing: 0.24em;
  color: var(--patina); text-transform: uppercase;
  margin-top: 1.2rem; text-align: center;
}
.hero__inscription .cn { font-family: var(--ff-body); letter-spacing: 0.3em; }
.hero__inscription .seal {
  display: inline-block; width: 0.5rem; height: 0.5rem; background: var(--seal);
  margin: 0 0.5rem; vertical-align: middle; border-radius: 1px;
  box-shadow: 0 0 6px rgba(156,58,44,0.6);
}

.scroll-cue {
  position: absolute; bottom: 1.4rem; left: 50%; transform: translateX(-50%);
  font-family: var(--ff-mono); font-size: 0.68rem; letter-spacing: 0.3em;
  color: var(--bone-faint); text-transform: uppercase;
  display: flex; flex-direction: column; align-items: center; gap: 0.5rem;
}
.scroll-cue__line { width: 1px; height: 2.4rem; background: linear-gradient(var(--patina), transparent); }

/* =========================================================
   bronze door — the motif
   ========================================================= */
.bronze-door {
  --seam: 0.72;          /* 0 = shut, 1 = open */
  --w: min(320px, 62vw);
  --h: calc(var(--w) * 1.95);
  position: relative;
  width: var(--w); height: var(--h);
  display: flex;
}
.bronze-door__leaf {
  position: relative;
  flex: 1; height: 100%;
  background:
    radial-gradient(120% 60% at 50% 0%, rgba(212,162,76,0.18), transparent 50%),
    linear-gradient(160deg, #4a3220 0%, #3a2817 30%, #2a1d10 70%, #1f1409 100%);
  border-top: 1px solid rgba(212,162,76,0.35);
  box-shadow:
    inset 0 0 60px rgba(0,0,0,0.6),
    inset 0 2px 0 rgba(212,162,76,0.15);
}
.bronze-door__leaf--left  { border-radius: 100% 100% 0 0 / 14% 14% 0 0; border-right: 1px solid rgba(0,0,0,0.4); }
.bronze-door__leaf--right { border-radius: 100% 100% 0 0 / 14% 14% 0 0; border-left:  1px solid rgba(0,0,0,0.4); }

/* 门钉 studs — tiled radial pattern */
.bronze-door__leaf::before {
  content: ""; position: absolute; inset: 14% 18% 8% 18%;
  background-image:
    radial-gradient(circle, #c79a52 0 3px, #6a4a22 3.5px 5px, transparent 5.5px);
  background-size: 22% 14%;
  background-position: 50% 50%;
  opacity: 0.85;
}
/* patina mottling */
.bronze-door__leaf::after {
  content: ""; position: absolute; inset: 0; border-radius: inherit;
  background-image:
    radial-gradient(40% 30% at 25% 30%, rgba(111,164,139,0.22), transparent 60%),
    radial-gradient(35% 25% at 75% 65%, rgba(111,164,139,0.16), transparent 60%),
    radial-gradient(25% 20% at 60% 20%, rgba(74,122,102,0.2), transparent 60%);
  mix-blend-mode: screen;
  pointer-events: none;
}

/* the lamplight seam between leaves */
.bronze-door__seam {
  position: absolute; left: 50%; top: 8%; bottom: 4%;
  width: 3px; transform: translateX(-50%) scaleY(var(--seam));
  transform-origin: center;
  background: linear-gradient(to bottom, transparent, var(--lamp-glow) 20%, var(--lamp) 50%, var(--lamp-glow) 80%, transparent);
  box-shadow: 0 0 14px 2px rgba(212,162,76,0.55), 0 0 40px 6px rgba(212,162,76,0.25);
  opacity: calc(0.25 + 0.75 * var(--seam));
  transition: transform 0.3s linear, opacity 0.3s linear;
}
/* the lamp the reader carries — always lit */
.bronze-door__lamp {
  position: absolute; left: 50%; top: 50%;
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--lamp-glow);
  box-shadow: 0 0 12px 3px rgba(232,190,110,0.7), 0 0 30px 8px rgba(212,162,76,0.3);
  transform: translate(-50%, -50%);
}

/* door frame */
.bronze-door__frame {
  position: absolute; inset: -6% -3% -2% -3%;
  border: 1px solid var(--patina-dim);
  border-radius: 100% 100% 0 0 / 12% 12% 0 0;
  box-shadow: inset 0 0 30px rgba(0,0,0,0.5);
  pointer-events: none;
}

/* =========================================================
   manifesto
   ========================================================= */
.manifesto { background: var(--earth); }
.manifesto__inner { max-width: 680px; margin: 0 auto; }
.manifesto .display { margin-bottom: 2rem; }
.manifesto__sig {
  margin-top: 2.5rem;
  font-family: var(--ff-mono); font-size: 0.74rem; letter-spacing: 0.2em;
  color: var(--bone-faint); text-transform: uppercase;
}
.manifesto__sig .cn { font-family: var(--ff-body); letter-spacing: 0.25em; }

/* =========================================================
   iron triangle
   ========================================================= */
.trinity { background: var(--ink); border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); }
.trinity__head { max-width: var(--maxw); margin: 0 auto 3rem; }
.trinity__grid {
  max-width: var(--maxw-wide); margin: 0 auto;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px;
  background: var(--rule);
}
.tri-card {
  background: var(--ink);
  padding: 2.5rem 2rem;
  display: flex; flex-direction: column;
}
.tri-card__num {
  font-family: var(--ff-mono); font-size: 0.7rem; letter-spacing: 0.24em;
  color: var(--patina-dim); margin-bottom: 1.4rem;
}
.tri-card__name {
  font-family: var(--ff-display); font-weight: 400;
  font-size: clamp(1.5rem, 2.4vw, 1.9rem); color: var(--bone);
  margin: 0 0 0.2rem;
}
.tri-card__role {
  font-family: var(--ff-mono); font-size: 0.72rem; letter-spacing: 0.22em;
  color: var(--patina); text-transform: uppercase; margin-bottom: 1.4rem;
}
.tri-card__role .cn { font-family: var(--ff-body); letter-spacing: 0.2em; }
.tri-card__body { color: var(--bone-dim); font-size: 0.96rem; line-height: 1.8; }

/* =========================================================
   chronicle — the timeline
   ========================================================= */
.chronicle { background: var(--earth); padding-bottom: 2rem; }
.chronicle__head { max-width: var(--maxw); margin: 0 auto 4rem; }

.entries {
  list-style: none; margin: 0; padding: 0;
  max-width: var(--maxw); margin: 0 auto;
  position: relative;
}
/* spine */
.entries::before {
  content: ""; position: absolute; left: 7.5rem; top: 0; bottom: 0;
  width: 1px; background: var(--rule-strong);
}

.entry {
  position: relative;
  display: grid; grid-template-columns: 7rem 1fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  padding: 0 0 3.2rem 0;
}
.entry:last-child { padding-bottom: 0; }

.entry__date {
  font-family: var(--ff-mono); font-size: 0.78rem; letter-spacing: 0.05em;
  color: var(--bone-faint); text-align: right;
  padding-top: 0.15rem; line-height: 1.5;
}
.entry__date .y { display: block; color: var(--patina); font-weight: 500; font-size: 0.92rem; letter-spacing: 0.08em; }

.entry__body { position: relative; }
/* node sits on the spine (7.5rem from the list's left edge) */
.entry__node {
  position: absolute;
  left: calc(0.5rem - clamp(1.5rem, 4vw, 3rem));
  transform: translateX(-50%);
  top: 0.55rem;
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--earth);
  border: 1px solid var(--patina);
  z-index: 2;
}
.entry__node::after {
  content: ""; position: absolute; inset: 2px; border-radius: 50%;
  background: var(--patina-dim);
}

.entry__loc {
  font-family: var(--ff-mono); font-size: 0.7rem; letter-spacing: 0.22em;
  color: var(--patina); text-transform: uppercase;
  margin-bottom: 0.5rem;
}
.entry__loc .cn { font-family: var(--ff-body); letter-spacing: 0.18em; }
.entry__title {
  font-family: var(--ff-display); font-weight: 400;
  font-size: clamp(1.25rem, 2.2vw, 1.6rem); color: var(--bone);
  margin: 0 0 0.8rem; line-height: 1.3;
}
.entry__desc { color: var(--bone-dim); font-size: 0.97rem; line-height: 1.85; margin: 0; }

/* the promise entry (2005) — sealed */
.entry--promise .entry__node { border-color: var(--seal); background: var(--ink); }
.entry--promise .entry__node::after { background: var(--seal); box-shadow: 0 0 8px rgba(156,58,44,0.7); }
.entry--promise .entry__loc { color: var(--seal); }

/* the homecoming (2015) — lit */
.entry--home .entry__node { border-color: var(--lamp); background: var(--earth); }
.entry--home .entry__node::after { background: var(--lamp); box-shadow: 0 0 12px rgba(212,162,76,0.8); }
.entry--home .entry__title em { color: var(--lamp); font-style: italic; font-weight: 400; }
.entry--home .entry__loc { color: var(--lamp); }

/* =========================================================
   decade gap — the signature
   ========================================================= */
.decade-gap {
  --seam: 0;
  position: relative;
  height: 220vh;
  background:
    radial-gradient(60% 50% at 50% 50%, rgba(111,164,139,0.04), transparent 70%),
    var(--ink);
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.decade-gap__stage {
  position: sticky; top: 0;
  height: 100vh;
  display: grid; grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: clamp(1.5rem, 4vw, 4rem);
  padding: 0 var(--gutter);
  overflow: hidden;
}
.decade-gap__tally {
  justify-self: end;
  display: flex; flex-direction: column; gap: 0.7rem;
  font-family: var(--ff-mono); font-size: 0.72rem; letter-spacing: 0.16em;
  color: var(--bone-faint);
}
.tally__year {
  display: flex; align-items: center; gap: 0.7rem;
  opacity: 0.32; transition: opacity 0.4s, color 0.4s;
}
.tally__year::before {
  content: ""; width: 14px; height: 1px; background: currentColor;
}
.tally__year.is-now { opacity: 1; color: var(--patina); }
.tally__year.is-now::before { width: 22px; }

.decade-gap__door { --w: min(260px, 50vw); --h: calc(var(--w) * 2); }

.decade-gap__caption {
  justify-self: start;
  font-family: var(--ff-display); font-weight: 300;
  font-size: clamp(2.5rem, 5vw, 4rem); color: var(--bone);
  line-height: 1; letter-spacing: 0.05em;
}
.decade-gap__caption .cn { font-family: var(--ff-body); }
.decade-gap__caption .small {
  display: block; font-family: var(--ff-mono); font-size: 0.7rem;
  letter-spacing: 0.24em; color: var(--bone-faint); text-transform: uppercase;
  margin-top: 0.8rem;
}

.decade-gap__label {
  position: absolute; top: 2rem; left: 50%; transform: translateX(-50%);
  font-family: var(--ff-mono); font-size: 0.7rem; letter-spacing: 0.28em;
  color: var(--patina); text-transform: uppercase; text-align: center;
}
.decade-gap__label .cn { font-family: var(--ff-body); letter-spacing: 0.25em; }

/* =========================================================
   colophon (footer)
   ========================================================= */
.colophon {
  background: var(--ink);
  border-top: 1px solid var(--rule);
  padding: var(--section-y) var(--gutter) 3rem;
}
.colophon__inner { max-width: var(--maxw-wide); margin: 0 auto; }
.colophon__top {
  display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 2rem;
  padding-bottom: 3rem; border-bottom: 1px solid var(--rule);
}
.colophon__seal {
  font-family: var(--ff-display); font-weight: 300;
  font-size: 1.8rem; color: var(--bone); margin: 0 0 0.6rem;
}
.colophon__seal .cn { font-family: var(--ff-body); font-weight: 500; }
.colophon__note { color: var(--bone-dim); font-size: 0.9rem; max-width: 36ch; }

.colophon__col h4 {
  font-family: var(--ff-mono); font-size: 0.7rem; letter-spacing: 0.22em;
  color: var(--patina); text-transform: uppercase; margin: 0 0 1.2rem; font-weight: 500;
}
.colophon__col ul { list-style: none; margin: 0; padding: 0; }
.colophon__col li { margin-bottom: 0.6rem; }
.colophon__col a { color: var(--bone-dim); font-size: 0.92rem; transition: color 0.2s; }
.colophon__col a:hover { color: var(--patina); }

.colophon__bottom {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: 1.8rem; flex-wrap: wrap; gap: 1rem;
  font-family: var(--ff-mono); font-size: 0.72rem; letter-spacing: 0.14em;
  color: var(--bone-faint); text-transform: uppercase;
}
.colophon__bottom .cn { font-family: var(--ff-body); letter-spacing: 0.18em; }

/* =========================================================
   reveal animation
   ========================================================= */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.is-visible { opacity: 1; transform: none; }
.reveal[data-delay="1"] { transition-delay: 0.08s; }
.reveal[data-delay="2"] { transition-delay: 0.16s; }
.reveal[data-delay="3"] { transition-delay: 0.24s; }

/* =========================================================
   responsive
   ========================================================= */
@media (max-width: 860px) {
  .trinity__grid { grid-template-columns: 1fr; }
  .colophon__top { grid-template-columns: 1fr; gap: 2.5rem; }
}

@media (max-width: 720px) {
  .nav-toggle {
    display: flex; flex-direction: column; gap: 5px;
    padding: 0.5rem; background: none; border: 0;
  }
  .nav-toggle span { width: 22px; height: 1.5px; background: var(--bone); transition: transform 0.3s; }
  .nav-toggle.is-open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
  .nav-toggle.is-open span:nth-child(2) { opacity: 0; }
  .nav-toggle.is-open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

  .nav-links {
    position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; align-items: flex-start;
    background: rgba(20,17,15,0.98);
    border-bottom: 1px solid var(--rule);
    padding: 1rem var(--gutter) 1.5rem;
    gap: 1rem;
    transform: translateY(-8px); opacity: 0; pointer-events: none;
    transition: opacity 0.25s, transform 0.25s;
  }
  .nav-links.is-open { opacity: 1; transform: none; pointer-events: auto; }
  .nav-actions { margin-left: 0; }

  /* timeline: spine moves to left edge, date stacks above */
  .entries::before { left: 0.5rem; }
  .entry { grid-template-columns: 1fr; gap: 0.4rem; padding-left: 2rem; padding-bottom: 2.6rem; }
  .entry__date { text-align: left; display: flex; gap: 0.6rem; align-items: baseline; }
  .entry__date .y { display: inline; }
  .entry__node { left: -1.5rem; }

  .decade-gap__stage { grid-template-columns: 1fr; gap: 1.5rem; }
  .decade-gap__tally { justify-self: center; flex-direction: row; flex-wrap: wrap; justify-content: center; }
  .decade-gap__caption { justify-self: center; text-align: center; }
}

@media (max-width: 480px) {
  .hero { padding-top: 4.5rem; }
  .bronze-door { --w: min(230px, 70vw); }
}

/* =========================================================
   SUBPAGE — shared page hero (smaller than index hero)
   ========================================================= */
.page-hero {
  position: relative;
  padding: 7rem var(--gutter) 4rem;
  background:
    radial-gradient(100% 80% at 50% 120%, rgba(111,164,139,0.06), transparent 60%),
    var(--earth);
  border-bottom: 1px solid var(--rule);
  overflow: hidden;
}
.page-hero__grain {
  position: absolute; inset: 0; pointer-events: none; opacity: 0.3;
  background-image:
    radial-gradient(circle at 22% 40%, rgba(111,164,139,0.05) 0 1px, transparent 2px),
    radial-gradient(circle at 68% 70%, rgba(212,162,76,0.04) 0 1px, transparent 2px);
  background-size: 9px 9px, 13px 13px;
}
.page-hero__inner { position: relative; max-width: var(--maxw); margin: 0 auto; }
.page-hero .display { margin: 0.6rem 0 1.2rem; }
.page-hero__meta {
  font-family: var(--ff-mono); font-size: 0.74rem; letter-spacing: 0.16em;
  color: var(--bone-faint);
  display: flex; flex-wrap: wrap; gap: 0.5rem 1.4rem; align-items: center;
}
.page-hero__meta .sep { color: var(--patina-dim); }
.page-hero__meta .loc { color: var(--patina); }

/* breadcrumb / back */
.crumb {
  font-family: var(--ff-mono); font-size: 0.72rem; letter-spacing: 0.16em;
  color: var(--bone-faint); text-transform: uppercase;
  margin-bottom: 1.4rem;
}
.crumb a { color: var(--bone-dim); }
.crumb a:hover { color: var(--patina); }
.crumb .sep { margin: 0 0.5rem; color: var(--patina-dim); }
.crumb .here { color: var(--patina); }

/* =========================================================
   ABOUT — 守卷人手记
   ========================================================= */
.about-body { background: var(--earth); }
.about-grid {
  max-width: var(--maxw-wide); margin: 0 auto;
  display: grid; grid-template-columns: 1.1fr 1fr; gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}
.about-prose .display { margin-bottom: 1.6rem; }
.about-prose .lede { margin-bottom: 1.8rem; }
.about-sig {
  margin-top: 2.5rem; padding-top: 1.6rem; border-top: 1px solid var(--rule);
  font-family: var(--ff-mono); font-size: 0.74rem; letter-spacing: 0.2em;
  color: var(--bone-faint); text-transform: uppercase;
}
.about-sig .cn { font-family: var(--ff-body); letter-spacing: 0.22em; color: var(--bone-dim); }

/* skills as inscribed tablets */
.skills { background: var(--ink); border: 1px solid var(--rule); padding: 2rem; }
.skills__title {
  font-family: var(--ff-mono); font-size: 0.7rem; letter-spacing: 0.24em;
  color: var(--patina); text-transform: uppercase; margin: 0 0 1.6rem;
}
.skill { margin-bottom: 1.3rem; }
.skill:last-child { margin-bottom: 0; }
.skill__head {
  display: flex; justify-content: space-between; align-items: baseline;
  margin-bottom: 0.5rem;
}
.skill__name { font-family: var(--ff-body); font-size: 0.92rem; color: var(--bone); }
.skill__pct { font-family: var(--ff-mono); font-size: 0.72rem; color: var(--bone-faint); letter-spacing: 0.1em; }
.skill__bar { height: 2px; background: var(--earth-3); position: relative; overflow: hidden; }
.skill__fill {
  position: absolute; left: 0; top: 0; bottom: 0;
  background: linear-gradient(to right, var(--patina-deep), var(--patina));
  width: var(--v, 0%);
  transition: width 1.2s cubic-bezier(0.2, 0.7, 0.2, 1);
}

/* timeline of learning */
.about-timeline { list-style: none; margin: 2.5rem 0 0; padding: 0; }
.about-timeline li {
  display: grid; grid-template-columns: 5rem 1fr; gap: 1.5rem;
  padding: 0.9rem 0; border-top: 1px solid var(--rule);
  font-size: 0.95rem; color: var(--bone-dim);
}
.about-timeline li:last-child { border-bottom: 1px solid var(--rule); }
.about-timeline .yr { font-family: var(--ff-mono); font-size: 0.78rem; color: var(--patina); letter-spacing: 0.08em; padding-top: 0.1rem; }

/* =========================================================
   MAP — 墓域方位 (tomb cards)
   ========================================================= */
.map-body { background: var(--earth); }
.tomb-grid {
  max-width: var(--maxw-wide); margin: 0 auto;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1px; background: var(--rule);
  border: 1px solid var(--rule);
}
.tomb-card {
  background: var(--ink);
  display: flex; flex-direction: column;
  text-decoration: none; color: inherit;
  position: relative; overflow: hidden;
  transition: background 0.3s;
}
.tomb-card:hover { background: var(--earth-2); }
.tomb-card__img {
  height: 200px; overflow: hidden; position: relative;
  background: var(--earth-3);
}
.tomb-card__img img {
  width: 100%; height: 100%; object-fit: cover;
  filter: grayscale(0.5) sepia(0.3) brightness(0.78) contrast(1.05);
  transition: filter 0.4s, transform 0.5s;
}
.tomb-card:hover .tomb-card__img img { filter: grayscale(0.25) sepia(0.15) brightness(0.9); transform: scale(1.04); }
.tomb-card__img::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(to bottom, transparent 50%, rgba(20,17,15,0.6));
  pointer-events: none;
}
.tomb-card__no {
  position: absolute; top: 0.8rem; left: 0.9rem; z-index: 2;
  font-family: var(--ff-mono); font-size: 0.68rem; letter-spacing: 0.2em;
  color: var(--patina); background: rgba(20,17,15,0.7); padding: 0.25rem 0.55rem;
}
.tomb-card__body { padding: 1.5rem 1.6rem 1.8rem; flex: 1; display: flex; flex-direction: column; }
.tomb-card__loc {
  font-family: var(--ff-mono); font-size: 0.68rem; letter-spacing: 0.2em;
  color: var(--patina); text-transform: uppercase; margin-bottom: 0.5rem;
}
.tomb-card__loc .cn { font-family: var(--ff-body); letter-spacing: 0.16em; }
.tomb-card__name {
  font-family: var(--ff-display); font-weight: 400;
  font-size: 1.5rem; color: var(--bone); margin: 0 0 0.7rem; line-height: 1.2;
}
.tomb-card__desc { color: var(--bone-dim); font-size: 0.9rem; line-height: 1.75; flex: 1; }
.tomb-card__cta {
  margin-top: 1.2rem; padding-top: 1rem; border-top: 1px solid var(--rule);
  font-family: var(--ff-mono); font-size: 0.72rem; letter-spacing: 0.18em;
  color: var(--bone-faint); text-transform: uppercase;
  display: flex; justify-content: space-between; align-items: center;
  transition: color 0.25s;
}
.tomb-card:hover .tomb-card__cta { color: var(--patina); }
.tomb-card__cta .arr { transition: transform 0.25s; }
.tomb-card:hover .tomb-card__cta .arr { transform: translateX(4px); }

/* =========================================================
   TEST — 墓室笔录 (article list)
   ========================================================= */
.list-body { background: var(--earth); }
.article-list {
  max-width: var(--maxw-wide); margin: 0 auto;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}
.article-card {
  display: flex; flex-direction: column;
  background: var(--ink); border: 1px solid var(--rule);
  text-decoration: none; color: inherit;
  transition: border-color 0.3s, transform 0.3s;
}
.article-card:hover { border-color: var(--rule-strong); transform: translateY(-3px); }
.article-card__img { height: 200px; overflow: hidden; background: var(--earth-3); }
.article-card__img img {
  width: 100%; height: 100%; object-fit: cover;
  filter: grayscale(0.45) sepia(0.25) brightness(0.8);
  transition: filter 0.4s, transform 0.5s;
}
.article-card:hover .article-card__img img { filter: grayscale(0.2) brightness(0.95); transform: scale(1.04); }
.article-card__body { padding: 1.6rem 1.6rem 1.8rem; flex: 1; display: flex; flex-direction: column; }
.article-card__no {
  font-family: var(--ff-mono); font-size: 0.68rem; letter-spacing: 0.2em;
  color: var(--patina-dim); margin-bottom: 0.6rem;
}
.article-card__title {
  font-family: var(--ff-display); font-weight: 400;
  font-size: 1.45rem; color: var(--bone); margin: 0 0 0.7rem; line-height: 1.25;
}
.article-card__excerpt { color: var(--bone-dim); font-size: 0.9rem; line-height: 1.75; flex: 1; }
.article-card__foot {
  margin-top: 1.2rem; padding-top: 0.9rem; border-top: 1px solid var(--rule);
  font-family: var(--ff-mono); font-size: 0.7rem; letter-spacing: 0.14em;
  color: var(--bone-faint);
  display: flex; justify-content: space-between; align-items: center;
}
.article-card__foot .read { color: var(--patina); }

/* =========================================================
   CALL — 联络站长 (contact tokens)
   ========================================================= */
.contact-body { background: var(--earth); }
.contact-wrap { max-width: 640px; margin: 0 auto; }
.contact-card {
  background: var(--ink); border: 1px solid var(--rule);
  padding: 2.5rem 2rem;
}
.contact-card__seal {
  text-align: center; margin-bottom: 2rem; padding-bottom: 1.8rem;
  border-bottom: 1px solid var(--rule);
}
.contact-card__seal .mark {
  display: inline-block; width: 2.4rem; height: 2.4rem; border-radius: 50%;
  border: 1px solid var(--patina-dim);
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 1rem;
  font-family: var(--ff-display); font-size: 1.3rem; color: var(--patina); font-style: italic;
}
.contact-card__seal h2 {
  font-family: var(--ff-display); font-weight: 400; font-size: 1.7rem;
  color: var(--bone); margin: 0 0 0.4rem;
}
.contact-card__seal .sub { font-family: var(--ff-mono); font-size: 0.72rem; letter-spacing: 0.2em; color: var(--bone-faint); text-transform: uppercase; }
.contact-list { list-style: none; margin: 0; padding: 0; }
.contact-list li {
  display: grid; grid-template-columns: 7rem 1fr; gap: 1.2rem;
  padding: 1.1rem 0; border-bottom: 1px solid var(--rule);
  align-items: center;
}
.contact-list li:last-child { border-bottom: 0; }
.contact-list .key {
  font-family: var(--ff-mono); font-size: 0.7rem; letter-spacing: 0.18em;
  color: var(--patina); text-transform: uppercase;
}
.contact-list .key .cn { font-family: var(--ff-body); letter-spacing: 0.14em; }
.contact-list .val { color: var(--bone); font-size: 0.95rem; word-break: break-all; }
.contact-list a.val:hover { color: var(--patina); }
.contact-note {
  margin-top: 2rem; text-align: center;
  font-family: var(--ff-mono); font-size: 0.72rem; letter-spacing: 0.16em;
  color: var(--bone-faint);
}

/* =========================================================
   AUTH — sign (入卷) & login (登记入册)
   ========================================================= */
.auth-body {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  padding: 5rem var(--gutter) 3rem;
  background:
    radial-gradient(60% 50% at 50% 30%, rgba(111,164,139,0.06), transparent 70%),
    radial-gradient(50% 40% at 50% 90%, rgba(212,162,76,0.04), transparent 70%),
    var(--earth);
  position: relative; overflow: hidden;
}
.auth-body__grain {
  position: absolute; inset: 0; pointer-events: none; opacity: 0.3;
  background-image:
    radial-gradient(circle at 30% 40%, rgba(111,164,139,0.05) 0 1px, transparent 2px),
    radial-gradient(circle at 70% 60%, rgba(212,162,76,0.04) 0 1px, transparent 2px);
  background-size: 9px 9px, 13px 13px;
}
.auth-card {
  position: relative; z-index: 1;
  width: 100%; max-width: 460px;
  background: var(--ink); border: 1px solid var(--rule);
  padding: clamp(2rem, 4vw, 3rem);
}
.auth-card__door { --w: 70px; --h: 130px; margin: 0 auto 1.5rem; }
.auth-card__door .bronze-door__seam { transition: transform 0.5s, opacity 0.5s; }
.auth-head { text-align: center; margin-bottom: 2rem; }
.auth-head .eyebrow { text-align: center; margin-bottom: 0.8rem; }
.auth-head h1 {
  font-family: var(--ff-display); font-weight: 400;
  font-size: 1.9rem; color: var(--bone); margin: 0 0 0.4rem;
}
.auth-head .sub { font-family: var(--ff-mono); font-size: 0.72rem; letter-spacing: 0.2em; color: var(--bone-faint); text-transform: uppercase; }

/* tabs */
.auth-tabs {
  display: flex; gap: 0; margin-bottom: 1.8rem;
  border-bottom: 1px solid var(--rule);
}
.auth-tabs button {
  flex: 1; padding: 0.8rem 0;
  font-family: var(--ff-mono); font-size: 0.78rem; letter-spacing: 0.16em;
  color: var(--bone-faint); text-transform: uppercase;
  border: 0; border-bottom: 1px solid transparent; margin-bottom: -1px;
  cursor: pointer; transition: color 0.2s, border-color 0.2s;
}
.auth-tabs button.is-active { color: var(--patina); border-bottom-color: var(--patina); }
.auth-tabs button:hover { color: var(--bone-dim); }
.auth-tabs .cn { font-family: var(--ff-body); letter-spacing: 0.14em; }

/* form */
.auth-form { display: none; }
.auth-form.is-active { display: block; }
.field { margin-bottom: 1.2rem; }
.field__label {
  display: block; font-family: var(--ff-mono); font-size: 0.7rem; letter-spacing: 0.16em;
  color: var(--patina); text-transform: uppercase; margin-bottom: 0.5rem;
}
.field__label .cn { font-family: var(--ff-body); letter-spacing: 0.12em; }
.field__input {
  width: 100%; padding: 0.7rem 0.9rem;
  background: var(--earth); border: 1px solid var(--rule); color: var(--bone);
  font-family: var(--ff-body); font-size: 0.95rem;
  border-radius: 1px; transition: border-color 0.2s;
}
.field__input::placeholder { color: var(--bone-faint); }
.field__input:focus { outline: none; border-color: var(--patina); }
.field__row { display: flex; gap: 0.6rem; }
.field__row .field__input { flex: 1; }
.field__code {
  font-family: var(--ff-mono); font-size: 0.78rem; letter-spacing: 0.1em;
  padding: 0.7rem 1rem; border: 1px solid var(--rule-strong); color: var(--patina);
  background: transparent; white-space: nowrap; cursor: pointer; border-radius: 1px;
  transition: border-color 0.2s, color 0.2s;
}
.field__code:hover { border-color: var(--patina); color: var(--bone); }
.auth-submit {
  width: 100%; margin-top: 0.6rem; padding: 0.85rem;
  font-family: var(--ff-mono); font-size: 0.82rem; letter-spacing: 0.18em;
  text-transform: uppercase;
  background: var(--patina-deep); color: var(--bone); border: 0; border-radius: 1px;
  cursor: pointer; transition: background 0.2s;
}
.auth-submit:hover { background: var(--patina-dim); }
.auth-submit .cn { font-family: var(--ff-body); letter-spacing: 0.16em; }

.auth-divider {
  display: flex; align-items: center; gap: 1rem;
  margin: 1.8rem 0 1.2rem;
  font-family: var(--ff-mono); font-size: 0.68rem; letter-spacing: 0.2em;
  color: var(--bone-faint); text-transform: uppercase;
}
.auth-divider::before, .auth-divider::after {
  content: ""; flex: 1; height: 1px; background: var(--rule);
}
.auth-others { display: flex; justify-content: center; gap: 1.2rem; }
.auth-others a {
  display: flex; flex-direction: column; align-items: center; gap: 0.5rem;
  font-family: var(--ff-mono); font-size: 0.66rem; letter-spacing: 0.14em;
  color: var(--bone-faint); text-transform: uppercase; transition: color 0.2s;
}
.auth-others a:hover { color: var(--patina); }
.auth-others .ic {
  width: 2.2rem; height: 2.2rem; border: 1px solid var(--rule-strong); border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--ff-display); font-size: 1rem; color: var(--patina); transition: border-color 0.2s;
}
.auth-others a:hover .ic { border-color: var(--patina); }
.auth-foot {
  margin-top: 1.8rem; text-align: center;
  font-family: var(--ff-mono); font-size: 0.72rem; letter-spacing: 0.12em;
  color: var(--bone-faint);
}
.auth-foot a { color: var(--patina); }
.auth-foot a:hover { color: var(--lamp); }
.auth-foot .cn { font-family: var(--ff-body); letter-spacing: 0.12em; color: var(--bone-dim); }

.auth-back {
  position: absolute; top: 1.5rem; left: 1.5rem; z-index: 2;
  font-family: var(--ff-mono); font-size: 0.72rem; letter-spacing: 0.16em;
  color: var(--bone-faint); text-transform: uppercase;
}
.auth-back:hover { color: var(--patina); }

/* =========================================================
   ARTICLE READER
   ========================================================= */
.reader-body { background: var(--earth); }
.reader {
  max-width: var(--maxw-wide); margin: 0 auto;
  display: grid; grid-template-columns: 16rem 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  padding: 0 var(--gutter) 5rem;
  align-items: start;
}
/* sidebar: tomb index */
.reader__toc {
  position: sticky; top: 5rem;
  padding-top: 1rem;
}
.toc-title {
  font-family: var(--ff-mono); font-size: 0.7rem; letter-spacing: 0.22em;
  color: var(--patina); text-transform: uppercase; margin: 0 0 1.2rem;
}
.toc-list { list-style: none; margin: 0; padding: 0; }
.toc-list li { margin: 0; }
.toc-list a {
  display: grid; grid-template-columns: 2.2rem 1fr; gap: 0.6rem;
  padding: 0.6rem 0; border-bottom: 1px solid var(--rule);
  font-size: 0.88rem; color: var(--bone-dim); transition: color 0.2s;
  align-items: center;
}
.toc-list a:hover { color: var(--bone); }
.toc-list .no { font-family: var(--ff-mono); font-size: 0.7rem; color: var(--patina-dim); letter-spacing: 0.08em; }
.toc-list .is-current { color: var(--patina); }
.toc-list .is-current .no { color: var(--patina); }
.toc-list .is-current .name { font-weight: 500; }

/* main column */
.reader__main { max-width: 680px; }
.lead-img { margin: 0 0 2.5rem; border: 1px solid var(--rule); }
.lead-img img { width: 100%; display: block; filter: grayscale(0.3) sepia(0.15) brightness(0.85); }
.lead-img figcaption {
  font-family: var(--ff-mono); font-size: 0.7rem; letter-spacing: 0.16em;
  color: var(--bone-faint); padding: 0.7rem 1rem; border-top: 1px solid var(--rule);
  text-transform: uppercase;
}

.section-h {
  font-family: var(--ff-display); font-weight: 400;
  font-size: 1.6rem; color: var(--bone); margin: 2.8rem 0 1.2rem;
  padding-bottom: 0.6rem; border-bottom: 1px solid var(--rule);
  display: flex; align-items: baseline; gap: 0.8rem;
}
.section-h:first-child { margin-top: 0; }
.section-h .en {
  font-family: var(--ff-mono); font-size: 0.68rem; letter-spacing: 0.22em;
  color: var(--patina); text-transform: uppercase; font-weight: 500;
}
.sub-h {
  font-family: var(--ff-display); font-weight: 500; font-style: italic;
  font-size: 1.15rem; color: var(--patina); margin: 1.8rem 0 0.8rem;
}
.reader__main p { color: var(--bone-dim); line-height: 1.95; margin: 0 0 1.1rem; }
.reader__main p:last-child { margin-bottom: 0; }
.reader__main .inline-img { margin: 2rem 0; border: 1px solid var(--rule); }
.reader__main .inline-img img { width: 100%; display: block; filter: grayscale(0.3) sepia(0.15) brightness(0.85); }

/* the 十年人间 poem */
.poem {
  margin: 3rem 0; padding: 2.5rem 2rem;
  background: var(--ink); border-left: 2px solid var(--seal);
  border-top: 1px solid var(--rule); border-right: 1px solid var(--rule); border-bottom: 1px solid var(--rule);
}
.poem__title {
  font-family: var(--ff-mono); font-size: 0.7rem; letter-spacing: 0.24em;
  color: var(--seal); text-transform: uppercase; margin: 0 0 1.2rem; text-align: center;
}
.poem__title .cn { font-family: var(--ff-body); letter-spacing: 0.3em; }
.poem p {
  font-family: var(--ff-display); font-weight: 300; font-style: italic;
  font-size: 1.08rem; color: var(--bone); line-height: 2; margin: 0 0 0.4rem;
}
.poem p.so { color: var(--bone-dim); }
.poem__coda {
  margin-top: 1.4rem; padding-top: 1.2rem; border-top: 1px solid var(--rule);
  font-family: var(--ff-body); font-style: normal; font-size: 0.95rem;
  color: var(--patina); text-align: center; letter-spacing: 0.04em;
}

/* prev / next */
.pn-nav {
  margin-top: 4rem; padding-top: 2rem; border-top: 1px solid var(--rule);
  display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem;
}
.pn-nav a {
  display: flex; flex-direction: column; gap: 0.3rem;
  padding: 1rem 1.2rem; border: 1px solid var(--rule);
  transition: border-color 0.2s, background 0.2s;
}
.pn-nav a:hover { border-color: var(--rule-strong); background: var(--earth-2); }
.pn-nav .dir { font-family: var(--ff-mono); font-size: 0.68rem; letter-spacing: 0.2em; color: var(--bone-faint); text-transform: uppercase; }
.pn-nav .name { font-family: var(--ff-display); font-size: 1.1rem; color: var(--bone); }
.pn-nav a.is-empty { opacity: 0.3; pointer-events: none; }
.pn-nav .pn-next { text-align: right; }

/* =========================================================
   responsive — subpages
   ========================================================= */
@media (max-width: 860px) {
  .about-grid { grid-template-columns: 1fr; }
  .reader { grid-template-columns: 1fr; }
  .reader__toc { position: static; margin-bottom: 1rem; }
  .toc-list { display: flex; flex-wrap: wrap; gap: 0.4rem 1rem; }
  .toc-list a { border-bottom: 0; padding: 0.3rem 0; }
}

@media (max-width: 600px) {
  .contact-list li { grid-template-columns: 1fr; gap: 0.3rem; }
  .pn-nav { grid-template-columns: 1fr; }
  .pn-nav .pn-next { text-align: left; }
  .about-timeline li { grid-template-columns: 1fr; gap: 0.2rem; }
}

/* =========================================================
   reduced motion
   ========================================================= */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .bronze-door__seam { transition: none; }
  .decade-gap { height: auto; min-height: 80vh; }
  .decade-gap__stage { position: static; height: auto; min-height: 80vh; padding: 4rem var(--gutter); }
  .decade-gap__door { --seam: 0; }
  .tally__year { opacity: 0.5; }
  .tally__year.is-now { opacity: 1; }
  .skill__fill { transition: none; }
  * { scroll-behavior: auto !important; }
}