@charset "UTF-8";
/* ============================================================================
   冯小平个人站
   Design language: 宣纸（paper）· 墨（ink）· 玉青（wind）· 青阳（sun/gold）
   Type: 宋体标题 + 无衬线正文（本地字体栈，零外部字体请求）
   Source of truth: design-system/default/MASTER.md
   ========================================================================= */

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
img, svg, canvas { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; }
ul, ol { margin: 0; padding: 0; list-style: none; }
:focus-visible { outline: 2px solid var(--jade); outline-offset: 3px; border-radius: 2px; }

/* ---------- 2. Tokens ---------- */
:root {
  /* paper */
  --paper:      #F7F3EA;
  --paper-2:    #FCFAF5;
  --paper-3:    #F1EADC;
  /* ink */
  --ink:        #14161B;
  --ink-2:      #2A2D34;
  --muted:      #5B5F66;   /* 5.6:1 on --paper */
  --faint:      #6C6F76;   /* 4.6:1 on --paper */
  /* accents */
  --jade:       #2C6E5D;
  --jade-2:     #1E5446;
  --jade-pale:  #E7F0EC;
  --gold:       #A16207;
  --gold-ink:   #8A5205;   /* small text */
  --gold-pale:  #F3E9D2;
  /* dark band */
  --night:      #0C1114;
  --night-2:    #121A1E;
  --night-line: rgba(255, 255, 255, .12);
  --night-text: #E8EDEA;
  --night-dim:  #A7B3AE;
  /* lines */
  --line:       #E0D9C8;
  --line-2:     #CFC6B1;
  /* type */
  --serif: "Songti SC", "STSong", "Noto Serif SC", "Source Han Serif SC", "Source Han Serif CN", "SimSun", "Georgia", serif;
  --sans:  "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Noto Sans SC", "Hiragino Sans GB", system-ui, -apple-system, "Segoe UI", sans-serif;
  /* metrics */
  --max: 1160px;
  --pad: clamp(20px, 5vw, 56px);
  --ease: cubic-bezier(.22, .61, .36, 1);
  --r-sm: 4px;
  --r:    10px;
  --r-lg: 18px;
  --shadow: 0 1px 2px rgba(20, 22, 27, .04), 0 12px 32px -16px rgba(20, 22, 27, .18);
}

/* ---------- 3. Base ---------- */
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.85;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
body.is-locked { overflow: hidden; }
::selection { background: var(--jade-pale); color: var(--jade-2); }

a { text-decoration: none; }
p a, .prose a, .foot a { text-decoration-thickness: 1px; text-underline-offset: 3px; }
p a:hover, .prose a:hover { color: var(--jade); }

h1, h2, h3, h4 { font-weight: 400; line-height: 1.32; text-wrap: balance; }

/* ---------- 4. Layout ---------- */
.wrap { width: 100%; max-width: var(--max); margin-inline: auto; padding-inline: var(--pad); }
.wrap--narrow { max-width: 820px; }
.section { padding-block: clamp(64px, 9vw, 120px); }
.section--tight { padding-block: clamp(48px, 6vw, 76px); }
.section--paper2 { background: var(--paper-2); border-block: 1px solid var(--line); }
.section[id], section[id] { scroll-margin-top: 92px; }

.stack > * + * { margin-top: 1.1em; }
.grid-2 { display: grid; gap: clamp(20px, 3vw, 40px); }
@media (min-width: 860px) { .grid-2 { grid-template-columns: repeat(2, 1fr); } }
.grid-3 { display: grid; gap: clamp(18px, 2.4vw, 28px); }
@media (min-width: 780px) { .grid-3 { grid-template-columns: repeat(3, 1fr); } }

/* ---------- 5. Type scale ---------- */
.label {
  display: inline-flex; align-items: center; gap: .7em;
  font-size: .7rem; font-weight: 600; letter-spacing: .24em; text-transform: uppercase;
  color: var(--jade);
}
.label::before { content: ""; width: 22px; height: 1px; background: currentColor; opacity: .55; }
.label--gold { color: var(--gold-ink); }
.label--plain::before { display: none; }

.h2 {
  font-family: var(--serif);
  font-size: clamp(1.6rem, 3.2vw, 2.5rem);
  line-height: 1.36;
  letter-spacing: .005em;
  margin-top: 18px;
}
.h2 em { font-style: normal; color: var(--jade); }
.h2 .sun { color: var(--gold-ink); }
.h3 { font-family: var(--serif); font-size: clamp(1.15rem, 1.5vw, 1.35rem); line-height: 1.5; }

.lead { margin-top: 18px; max-width: 60ch; color: var(--muted); font-size: 1.02rem; line-height: 2; }
.note { color: var(--faint); font-size: .86rem; line-height: 1.9; }
.sec-head { max-width: 800px; }
.eyebrow {
  font-size: .72rem; letter-spacing: .26em; text-transform: uppercase; color: var(--faint);
}
.num { font-family: var(--serif); font-variant-numeric: lining-nums; color: var(--gold-ink); }

/* ---------- 6. Motion / reveal ---------- */
.js [data-reveal] {
  opacity: 0; transform: translateY(18px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
  transition-delay: var(--d, 0s);
  will-change: opacity, transform;
}
.js [data-reveal].is-in { opacity: 1; transform: none; }
.no-js [data-reveal], .no-motion [data-reveal] { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1 !important; transform: none !important; transition: none !important; }
  * { animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}

/* ---------- 7. Top bar ---------- */
.skip {
  position: absolute; left: 12px; top: -60px; z-index: 200;
  background: var(--ink); color: var(--paper); padding: 10px 16px; border-radius: var(--r-sm);
  font-size: .85rem; transition: top .2s var(--ease);
}
.skip:focus { top: 12px; }

.topbar {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background .4s var(--ease), border-color .4s var(--ease), backdrop-filter .4s var(--ease);
}
.topbar.is-solid {
  background: rgba(247, 243, 234, .82);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  backdrop-filter: blur(16px) saturate(140%);
  border-bottom-color: var(--line);
}
.topbar.is-dark:not(.is-solid) { color: var(--night-text); }
.topbar.is-dark.is-solid { background: rgba(244, 240, 231, .86); color: var(--ink); }
.topbar__in {
  max-width: var(--max); margin-inline: auto; padding-inline: var(--pad);
  height: 74px; display: flex; align-items: center; justify-content: space-between; gap: 20px;
}
.brand { display: inline-flex; align-items: center; gap: 11px; padding-block: 6px; }
.brand__mark { width: 32px; height: 32px; flex: none; }
.brand__txt { display: flex; flex-direction: column; line-height: 1.12; }
.brand__cn { font-family: var(--serif); font-size: 1.04rem; letter-spacing: .14em; }
.brand__en { font-size: .56rem; letter-spacing: .2em; text-transform: uppercase; color: var(--faint); margin-top: 5px; }

.nav { display: flex; align-items: center; gap: clamp(12px, 2vw, 28px); }
.nav a {
  position: relative; font-size: .875rem; letter-spacing: .06em; color: var(--muted);
  padding-block: 6px; transition: color .25s;
}
.topbar.is-dark:not(.is-solid) .nav a { color: var(--night-dim); }
.nav a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 1px;
  background: currentColor; transform: scaleX(0); transform-origin: 0 50%;
  transition: transform .3s var(--ease);
}
.nav a:hover, .nav a[aria-current="page"] { color: var(--ink); }
.topbar.is-dark:not(.is-solid) .nav a:hover,
.topbar.is-dark:not(.is-solid) .nav a[aria-current="page"] { color: #fff; }
.nav a:hover::after, .nav a[aria-current="page"]::after { transform: scaleX(1); }

.topbar__cta { display: inline-flex; align-items: center; gap: 8px; }
@media (max-width: 899px) {
  .nav, .topbar__cta.btn { display: none; }
}

.burger {
  display: none; width: 44px; height: 44px; margin-right: -8px;
  align-items: center; justify-content: center;
  background: none; border: 0; cursor: pointer; color: inherit;
}
.burger span { position: relative; display: block; width: 22px; height: 1.5px; background: currentColor; }
.burger span::before, .burger span::after {
  content: ""; position: absolute; left: 0; width: 22px; height: 1.5px; background: currentColor;
  transition: transform .3s var(--ease), top .3s var(--ease);
}
.burger span::before { top: -6px; }
.burger span::after { top: 6px; }
.burger[aria-expanded="true"] span { background: transparent; }
.burger[aria-expanded="true"] span::before { top: 0; transform: rotate(45deg); }
.burger[aria-expanded="true"] span::after { top: 0; transform: rotate(-45deg); }
@media (max-width: 899px) { .burger { display: inline-flex; } }

.drawer {
  position: fixed; inset: 0; z-index: 99;
  background: var(--paper); padding: 96px var(--pad) 40px;
  display: flex; flex-direction: column; gap: 4px;
  transform: translateY(-8px); opacity: 0; visibility: hidden;
  transition: opacity .3s var(--ease), transform .3s var(--ease);
  overflow-y: auto;
}
.drawer[data-open="true"] { opacity: 1; visibility: visible; transform: none; }
.drawer a {
  display: flex; align-items: baseline; gap: 14px;
  font-family: var(--serif); font-size: 1.45rem; padding-block: 14px;
  border-bottom: 1px solid var(--line);
}
.drawer a i { font-family: var(--sans); font-style: normal; font-size: .68rem; letter-spacing: .2em; color: var(--gold-ink); }
.drawer .drawer-foot { margin-top: auto; padding-top: 28px; color: var(--muted); font-size: .85rem; }
@media (min-width: 900px) { .drawer { display: none; } }

/* ---------- 8. Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  min-height: 46px; padding: 0 22px; border-radius: 999px;
  border: 1px solid transparent; cursor: pointer;
  font-size: .9rem; letter-spacing: .04em; white-space: nowrap;
  transition: background .25s var(--ease), color .25s var(--ease), border-color .25s var(--ease), transform .25s var(--ease), box-shadow .25s var(--ease);
}
.btn svg { width: 15px; height: 15px; flex: none; }
.btn--primary { background: var(--jade); color: #fff; }
.btn--primary:hover { background: var(--jade-2); box-shadow: 0 8px 24px -10px rgba(30, 84, 70, .6); transform: translateY(-1px); }
.btn--ink { background: var(--ink); color: var(--paper); }
.btn--ink:hover { background: #000; transform: translateY(-1px); }
.btn--outline { border-color: var(--line-2); color: var(--ink); background: transparent; }
.btn--outline:hover { border-color: var(--ink); background: rgba(20, 22, 27, .04); }
.btn--ghost-light { border-color: rgba(255, 255, 255, .28); color: var(--night-text); background: transparent; }
.btn--ghost-light:hover { background: rgba(255, 255, 255, .08); border-color: rgba(255, 255, 255, .5); }
.btn--sm { min-height: 42px; padding: 0 16px; font-size: .82rem; }
.btn-row { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }

.link-arrow {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: .88rem; color: var(--jade); border-bottom: 1px solid transparent;
  transition: gap .25s var(--ease), border-color .25s;
}
.link-arrow svg { width: 14px; height: 14px; transition: transform .25s var(--ease); }
.link-arrow:hover { border-bottom-color: currentColor; }
.link-arrow:hover svg { transform: translateX(3px); }

/* ---------- 9. Hero ---------- */
.hero {
  position: relative; isolation: isolate;
  background: var(--night);
  color: var(--night-text);
  min-height: min(92svh, 860px);
  display: flex; flex-direction: column; justify-content: flex-end;
  padding-top: 120px; padding-bottom: clamp(32px, 5vw, 56px);
  overflow: hidden;
}
.hero__canvas { position: absolute; inset: 0; width: 100%; height: 100%; z-index: -1; opacity: .85; }
.hero__sun {
  position: absolute; z-index: -1; right: clamp(-120px, -6vw, 0px); top: clamp(60px, 12vh, 160px);
  width: min(46vw, 520px); aspect-ratio: 1; border-radius: 50%;
  background: radial-gradient(circle at 50% 50%, rgba(216, 168, 74, .5) 0%, rgba(216, 168, 74, .18) 42%, rgba(216, 168, 74, 0) 70%);
  filter: blur(6px);
  animation: sun-breathe 14s ease-in-out infinite alternate;
}
@keyframes sun-breathe { from { transform: scale(.94); opacity: .75; } to { transform: scale(1.04); opacity: 1; } }
.hero__grain {
  position: absolute; inset: 0; z-index: -1; pointer-events: none; opacity: .5;
  background-image: linear-gradient(180deg, rgba(12, 17, 20, 0) 52%, rgba(12, 17, 20, .82) 100%),
    radial-gradient(ellipse at 20% 0%, rgba(44, 110, 93, .22), transparent 62%);
}
.hero__in { position: relative; width: 100%; max-width: var(--max); margin-inline: auto; padding-inline: var(--pad); }
.hero__eyebrow {
  display: flex; flex-wrap: wrap; align-items: center; gap: 10px 14px;
  font-size: .74rem; letter-spacing: .22em; text-transform: uppercase; color: #9FB0AA;
}
.hero__eyebrow .dot { width: 5px; height: 5px; border-radius: 50%; background: #D8A84A; flex: none; }
.hero__eyebrow .eyebrow-en { padding-left: 12px; border-left: 1px solid rgba(255,255,255,.18); }
@media (max-width: 600px) { .hero__eyebrow .eyebrow-en { display: none; } }
.hero h1 {
  margin-top: clamp(22px, 4vw, 34px);
  font-family: var(--serif);
  font-size: clamp(2.05rem, 5.6vw, 4.35rem);
  line-height: 1.26; letter-spacing: .015em;
  color: #F4F1E8;
}
.hero h1 span { display: block; }
.hero h1 .l2 { color: #BFD9CF; margin-top: .12em; }
.hero__lead {
  margin-top: clamp(20px, 3vw, 30px); max-width: 44ch;
  color: #B9C6C1; font-size: clamp(.96rem, 1.15vw, 1.06rem); line-height: 2.05;
}
.hero__actions { margin-top: clamp(26px, 3.4vw, 38px); }
.hero__meta {
  margin-top: clamp(32px, 5vw, 56px); padding-top: 20px;
  border-top: 1px solid var(--night-line);
  display: flex; flex-wrap: wrap; gap: 10px 26px;
  font-size: .74rem; letter-spacing: .12em; color: #8E9C97;
}
.hero__meta b { color: #D8A84A; font-weight: 500; margin-right: 6px; font-variant-numeric: tabular-nums; }
.hero__side {
  position: absolute; right: clamp(10px, 2.6vw, 34px); top: 50%; transform: translateY(-50%);
  writing-mode: vertical-rl; font-family: var(--serif); font-size: .8rem; letter-spacing: .5em;
  color: rgba(232, 237, 234, .34); pointer-events: none;
}
@media (max-width: 899px) { .hero__side { display: none; } }

/* inner page header */
.pagehead {
  position: relative; background: var(--night); color: var(--night-text);
  padding-top: 132px; padding-bottom: clamp(44px, 6vw, 76px); overflow: hidden;
}
.pagehead--paper { background: var(--paper-3); color: var(--ink); border-bottom: 1px solid var(--line); }
.pagehead__glow {
  position: absolute; z-index: 0; right: -10%; top: -40%; width: 60vw; max-width: 760px; aspect-ratio: 1;
  background: radial-gradient(circle, rgba(44, 110, 93, .45), transparent 62%); filter: blur(10px);
}
.pagehead--paper .pagehead__glow { background: radial-gradient(circle, rgba(161, 98, 7, .12), transparent 62%); }
.pagehead__in { position: relative; z-index: 1; }
.pagehead h1 {
  margin-top: 18px; font-family: var(--serif);
  font-size: clamp(1.85rem, 4.4vw, 3.2rem); line-height: 1.3; color: #F4F1E8;
}
.pagehead--paper h1 { color: var(--ink); }
.pagehead p { margin-top: 18px; max-width: 62ch; color: #AFBCB7; font-size: 1rem; line-height: 2; }
.pagehead--paper p { color: var(--muted); }
.pagehead .label { color: #9FD0BF; }
.pagehead--paper .label { color: var(--jade); }

.hero .label, .pagehead .label { color: #9FD0BF; }

/* ---------- 10. Statement strip ---------- */
.strip { background: var(--paper-2); border-bottom: 1px solid var(--line); }
.strip__in {
  display: grid; gap: clamp(18px, 3vw, 36px); padding-block: clamp(34px, 4vw, 52px);
}
@media (min-width: 860px) { .strip__in { grid-template-columns: repeat(3, 1fr); } }
.pillar { padding-left: 18px; border-left: 1px solid var(--line-2); }
.pillar h3 { font-family: var(--serif); font-size: 1.02rem; letter-spacing: .04em; }
.pillar p { margin-top: 8px; color: var(--muted); font-size: .88rem; line-height: 1.95; }
.pillar b { display: block; font-size: .66rem; letter-spacing: .22em; color: var(--gold-ink); margin-bottom: 8px; font-weight: 600; }

/* ---------- 11. Cards ---------- */
.card {
  position: relative; display: flex; flex-direction: column;
  background: var(--paper-2); border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: clamp(22px, 2.6vw, 32px);
  transition: border-color .3s var(--ease), transform .3s var(--ease), box-shadow .3s var(--ease), background .3s;
}
.card:hover { border-color: var(--line-2); transform: translateY(-3px); box-shadow: var(--shadow); background: #fff; }
.card__top { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.card__num { font-family: var(--serif); font-size: .8rem; letter-spacing: .16em; color: var(--gold-ink); }
.card__icon { width: 30px; height: 30px; color: var(--jade); opacity: .9; }
.card h3 { margin-top: 16px; font-family: var(--serif); font-size: 1.3rem; }
.card__en { margin-top: 6px; font-size: .64rem; letter-spacing: .18em; text-transform: uppercase; color: var(--faint); }
.card p { margin-top: 14px; color: var(--muted); font-size: .92rem; line-height: 1.95; }
.card__list { margin-top: 16px; display: grid; gap: 10px; }
.card__list li { position: relative; padding-left: 16px; font-size: .88rem; color: var(--ink-2); line-height: 1.9; }
.card__list li::before {
  content: ""; position: absolute; left: 0; top: .82em; width: 5px; height: 5px;
  border-radius: 50%; background: var(--jade); opacity: .55;
}
.card__foot { margin-top: auto; padding-top: 20px; }

/* ---------- 12. Steps (method) ---------- */
.steps { display: grid; gap: 0; border-top: 1px solid var(--line); }
.step {
  display: grid; gap: 2px 22px; padding-block: 24px;
  border-bottom: 1px solid var(--line);
  grid-template-columns: 1fr;
}
@media (min-width: 560px) {
  .step { grid-template-columns: 78px 1fr; }
  .step__num { grid-row: 1 / span 2; }
  .step h3, .step p { grid-column: 2; }
}
.step__num { font-family: var(--serif); font-size: .78rem; letter-spacing: .14em; color: var(--gold-ink); padding-top: 6px; }
.step h3 { font-family: var(--serif); font-size: 1.16rem; }
.step p { color: var(--muted); font-size: .92rem; line-height: 1.95; }

/* ---------- 13. Note list ---------- */
.notes { border-top: 1px solid var(--line); }
.note-item { border-bottom: 1px solid var(--line); }
.note-item > a {
  display: grid; gap: 8px 28px; padding-block: clamp(22px, 3vw, 30px);
  transition: background .3s var(--ease), padding-inline .3s var(--ease);
}
@media (min-width: 820px) { .note-item > a { grid-template-columns: 170px 1fr auto; align-items: baseline; } }
.note-item > a:hover { background: var(--paper-2); }
.note-item__meta { font-size: .72rem; letter-spacing: .12em; color: var(--faint); text-transform: uppercase; line-height: 1.75; }
.note-item__meta b { display: block; color: var(--gold-ink); font-weight: 600; font-size: .7rem; margin-bottom: 2px; }
.note-item h3 { font-family: var(--serif); font-size: clamp(1.08rem, 1.7vw, 1.3rem); line-height: 1.55; transition: color .25s; }
.note-item > a:hover h3 { color: var(--jade); }
.note-item p { margin-top: 8px; color: var(--muted); font-size: .9rem; line-height: 1.9; max-width: 62ch; }
.note-item__go { color: var(--faint); font-size: .8rem; letter-spacing: .12em; white-space: nowrap; }
.note-item > a:hover .note-item__go { color: var(--jade); }

/* ---------- 14. Quote band ---------- */
.quote {
  padding-block: clamp(56px, 7vw, 96px);
  background: var(--night); color: var(--night-text); position: relative; overflow: hidden;
}
.quote::before {
  content: ""; position: absolute; left: 50%; top: -30%; width: 70vw; max-width: 900px; aspect-ratio: 1;
  transform: translateX(-50%);
  background: radial-gradient(circle, rgba(44, 110, 93, .3), transparent 60%);
}
.quote blockquote { position: relative; margin: 0; max-width: 880px; }
.quote p {
  font-family: var(--serif); font-size: clamp(1.2rem, 2.6vw, 1.9rem); line-height: 1.75; color: #F2EFE6;
  text-wrap: balance;
}
.quote cite {
  display: block; margin-top: 22px; font-style: normal;
  font-size: .72rem; letter-spacing: .22em; text-transform: uppercase; color: #8E9C97;
}

/* ---------- 15. Offers ---------- */
.offer {
  display: flex; flex-direction: column; gap: 14px;
  padding: clamp(22px, 2.6vw, 30px);
  background: var(--paper-2); border: 1px solid var(--line); border-radius: var(--r-lg);
}
.offer__k { font-size: .68rem; letter-spacing: .2em; text-transform: uppercase; color: var(--gold-ink); }
.offer h3 { font-family: var(--serif); font-size: 1.22rem; }
.offer p { color: var(--muted); font-size: .9rem; line-height: 1.95; }
.offer ul { display: grid; gap: 6px; margin-top: 2px; }
.offer li { position: relative; padding-left: 16px; font-size: .85rem; color: var(--ink-2); }
.offer li::before { content: "—"; position: absolute; left: 0; color: var(--jade); opacity: .7; }
.offer__foot { margin-top: auto; padding-top: 10px; }

/* ---------- 16. CTA band ---------- */
.cta-band {
  position: relative; overflow: hidden;
  background: var(--paper-3); border-block: 1px solid var(--line);
}
.cta-band__in {
  display: grid; gap: 26px; padding-block: clamp(52px, 7vw, 88px); align-items: center;
}
@media (min-width: 900px) { .cta-band__in { grid-template-columns: 1.35fr .65fr; } }
.cta-band h2 { font-family: var(--serif); font-size: clamp(1.5rem, 3vw, 2.2rem); line-height: 1.4; }
.cta-band p { margin-top: 12px; color: var(--muted); max-width: 52ch; font-size: .95rem; }
.cta-band__actions { display: flex; flex-wrap: wrap; gap: 12px; }

/* ---------- 17. Article / prose ---------- */
.article { padding-top: clamp(104px, 9vw, 126px); padding-bottom: clamp(44px, 6vw, 76px); }
.article__head { border-bottom: 1px solid var(--line); padding-bottom: 26px; }
.article__meta { display: flex; flex-wrap: wrap; gap: 8px 18px; font-size: .74rem; letter-spacing: .14em; color: var(--faint); text-transform: uppercase; }
.article__meta b { color: var(--gold-ink); font-weight: 600; }
.article h1 {
  margin-top: 16px; font-family: var(--serif);
  font-size: clamp(1.7rem, 3.8vw, 2.7rem); line-height: 1.38;
}
.article__dek { margin-top: 14px; color: var(--muted); font-size: 1.02rem; line-height: 2; max-width: 60ch; }
.prose { max-width: 68ch; font-size: 1.02rem; line-height: 2.05; color: var(--ink-2); }
.prose > * + * { margin-top: 1.35em; }
.prose h2 {
  margin-top: 2.2em; font-family: var(--serif); font-size: clamp(1.25rem, 2vw, 1.5rem);
  color: var(--ink); line-height: 1.5;
}
.prose h3 { margin-top: 1.9em; font-family: var(--serif); font-size: 1.12rem; color: var(--ink); }
.prose p { color: var(--ink-2); }
.prose strong { color: var(--ink); font-weight: 600; }
.prose em { font-style: normal; color: var(--jade-2); border-bottom: 1px dashed rgba(44, 110, 93, .4); }
.prose blockquote {
  margin-block: 1.8em; padding: 6px 0 6px 22px; border-left: 2px solid var(--gold);
  font-family: var(--serif); font-size: 1.1rem; color: var(--ink); line-height: 1.9;
}
.prose ul, .prose ol { padding-left: 1.2em; }
.prose ul li { list-style: none; position: relative; padding-left: 4px; }
.prose ul li::before { content: ""; position: absolute; left: -1em; top: .85em; width: 5px; height: 5px; background: var(--jade); border-radius: 50%; opacity: .6; }
.prose ol { list-style: decimal; }
.prose ol li::marker { color: var(--gold-ink); font-variant-numeric: tabular-nums; }
.prose hr { border: 0; border-top: 1px solid var(--line); margin-block: 2.4em; }
.prose code { font-family: ui-monospace, "Cascadia Code", Consolas, monospace; font-size: .88em; background: var(--paper-3); padding: .12em .4em; border-radius: 3px; }
.prose a { color: var(--jade); border-bottom: 1px solid rgba(44, 110, 93, .3); }
.prose a:hover { border-bottom-color: var(--jade); }
.prose .toc-note { font-size: .86rem; color: var(--faint); }

.reading-progress {
  position: fixed; inset: 0 0 auto 0; height: 2px; z-index: 150;
  background: linear-gradient(90deg, var(--jade), var(--gold));
  transform: scaleX(0); transform-origin: 0 50%;
}

/* ---------- 18. Table ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--r); background: var(--paper-2); }
table { width: 100%; border-collapse: collapse; font-size: .88rem; min-width: 560px; }
caption { caption-side: bottom; padding: 12px 16px; text-align: left; font-size: .76rem; color: var(--faint); }
th, td { text-align: left; padding: 14px 18px; border-bottom: 1px solid var(--line); vertical-align: top; }
thead th { font-size: .68rem; letter-spacing: .16em; text-transform: uppercase; color: var(--gold-ink); font-weight: 600; background: var(--paper-3); }
tbody th { font-weight: 600; color: var(--ink); width: 22%; }
tbody tr:last-child th, tbody tr:last-child td { border-bottom: 0; }
td { color: var(--muted); }

/* ---------- 19. Timeline ---------- */
.timeline { position: relative; display: grid; gap: 0; }
.tl-item {
  display: grid; gap: 6px 26px; padding-block: 24px;
  border-top: 1px solid var(--line);
}
@media (min-width: 760px) { .tl-item { grid-template-columns: 96px 1fr; } }
.tl-item__year { font-family: var(--serif); font-size: 1.02rem; color: var(--gold-ink); letter-spacing: .06em; }
.tl-item h3 { font-family: var(--serif); font-size: 1.1rem; }
.tl-item p { margin-top: 6px; color: var(--muted); font-size: .9rem; line-height: 1.95; max-width: 62ch; }

/* ---------- 20. FAQ ---------- */
.faq { border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary {
  display: flex; align-items: flex-start; justify-content: space-between; gap: 18px;
  padding-block: 20px; cursor: pointer; list-style: none;
  font-family: var(--serif); font-size: 1.05rem; line-height: 1.6;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-family: var(--sans); font-size: 1.2rem; color: var(--jade); line-height: 1; flex: none; transition: transform .25s var(--ease); }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details > p { padding-bottom: 22px; color: var(--muted); font-size: .92rem; line-height: 2; max-width: 66ch; }
.faq details > p + p { margin-top: -10px; }

/* ---------- 21. Contact / form ---------- */
.contact-grid { display: grid; gap: clamp(28px, 4vw, 56px); }
@media (min-width: 900px) { .contact-grid { grid-template-columns: .92fr 1.08fr; align-items: start; } }
.mailbox {
  display: flex; flex-wrap: wrap; align-items: center; gap: 12px;
  padding: 18px 20px; border: 1px solid var(--line); border-radius: var(--r);
  background: var(--paper-2);
}
.mailbox a { font-family: var(--serif); font-size: clamp(1rem, 1.9vw, 1.22rem); color: var(--jade-2); word-break: break-all; }
.mailbox button { margin-left: auto; }

.form { display: grid; gap: 18px; }
.field { display: grid; gap: 7px; }
.field > label { font-size: .82rem; letter-spacing: .06em; color: var(--ink-2); }
.field .req { color: var(--gold-ink); }
.field input, .field select, .field textarea {
  width: 100%; min-height: 46px; padding: 11px 14px;
  background: #fff; border: 1px solid var(--line-2); border-radius: var(--r-sm);
  font-size: .95rem; color: var(--ink); transition: border-color .2s, box-shadow .2s;
}
.field textarea { min-height: 132px; resize: vertical; line-height: 1.8; }
.field select { appearance: none; background-image: linear-gradient(45deg, transparent 50%, var(--muted) 50%), linear-gradient(135deg, var(--muted) 50%, transparent 50%); background-position: calc(100% - 20px) 21px, calc(100% - 15px) 21px; background-size: 5px 5px, 5px 5px; background-repeat: no-repeat; padding-right: 40px; }
.field input:hover, .field select:hover, .field textarea:hover { border-color: var(--faint); }
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--jade); box-shadow: 0 0 0 3px rgba(44, 110, 93, .14); }
.field__hint { font-size: .78rem; color: var(--faint); line-height: 1.7; }
.field__error { display: none; font-size: .8rem; color: #B42318; }
.field.is-invalid input, .field.is-invalid textarea, .field.is-invalid select { border-color: #B42318; }
.field.is-invalid .field__error { display: block; }
.form__note { font-size: .78rem; color: var(--faint); line-height: 1.8; }
.form-status { font-size: .88rem; padding: 12px 14px; border-radius: var(--r-sm); display: none; line-height: 1.7; }
.form-status.is-ok { display: block; background: var(--jade-pale); color: var(--jade-2); }
.form-status.is-err { display: block; background: #FDECEA; color: #912018; }

/* ---------- 22. Footer ---------- */
.foot { background: var(--night); color: var(--night-text); padding-block: clamp(44px, 6vw, 72px) 26px; }
.foot__top { display: grid; gap: clamp(28px, 4vw, 56px); padding-bottom: clamp(32px, 4vw, 48px); }
@media (min-width: 860px) { .foot__top { grid-template-columns: 1.5fr 1fr 1fr 1fr; } }
.foot__brand p { margin-top: 14px; color: #93A19C; font-size: .84rem; line-height: 1.9; max-width: 34ch; }
.foot__motto { font-family: var(--serif); letter-spacing: .2em; color: #C7D6D0; margin-top: 16px; font-size: .84rem; }
.foot h4 { font-size: .68rem; letter-spacing: .2em; text-transform: uppercase; color: #7F8D88; font-weight: 600; }
.foot ul { margin-top: 14px; display: grid; gap: 9px; }
.foot ul a { color: #C3CFCB; font-size: .86rem; transition: color .2s; }
.foot ul a:hover { color: #fff; }
.foot__bot {
  border-top: 1px solid var(--night-line); padding-top: 22px;
  display: flex; flex-wrap: wrap; align-items: baseline; gap: 12px 26px;
  justify-content: space-between;
  font-size: .76rem; color: #7F8D88; letter-spacing: .04em;
}
.foot__bot a { text-decoration: underline; text-underline-offset: 3px; }
.foot__filings { display: inline-flex; flex-wrap: wrap; align-items: baseline; gap: 8px; }
.foot__filings a { color: #A2B0AB; text-decoration: none; white-space: nowrap; transition: color .2s var(--ease); }
.foot__filings a:hover { color: #fff; text-decoration: underline; }
.foot__sep { color: rgba(255, 255, 255, .22); }
.foot__badge { display: inline-block; width: 16px; height: 18px; margin-right: 5px; vertical-align: -4px; border: 0; }
.foot__filings a:hover .foot__badge { filter: brightness(1.15); }
.foot__license { color: #74827D; }
.foot__license a { color: #A2B0AB; }
@media (max-width: 640px) {
  .foot__bot { flex-direction: column; align-items: flex-start; gap: 10px; }
  .foot__filings { flex-direction: column; gap: 6px; }
  .foot__sep { display: none; }
}
.foot .brand__en { color: #7F8D88; }

/* ---------- 23. 页面级微调 ---------- */
/* 左右并排的小卡在窄列里会被挤成竖排，改为堆叠 */
.mini-offers { display: grid; gap: 14px; margin-top: 16px; }
.mini-offers .offer { padding: 18px 20px; }
/* 正文内嵌 CTA：单列，避免在窄容器里被压成两栏 */
.cta-inline { border-radius: var(--r-lg); border: 1px solid var(--line); }
.cta-inline .cta-band__in { grid-template-columns: 1fr; gap: 18px; padding-block: 34px; }
.cta-inline h2 { font-size: 1.35rem; }
.cta-inline .cta-band__actions { justify-content: flex-start; }

/* ---------- 24. Utilities ---------- */
.center { text-align: center; }
.center .label { justify-content: center; }
.center .lead { margin-inline: auto; }
.mt-6 { margin-top: 26px; }
.mt-10 { margin-top: 42px; }
.rule { height: 1px; background: var(--line); border: 0; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.tag-list { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.tag-list span {
  font-size: .74rem; letter-spacing: .08em; color: var(--jade-2);
  background: var(--jade-pale); border-radius: 999px; padding: 5px 12px;
}
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  font-size: .8rem; padding: 6px 13px; border: 1px solid var(--line-2);
  border-radius: 999px; color: var(--ink-2); background: var(--paper-2);
}

/* ---------- 25. 语言切换（排版式，非控件） ---------- */
.lang-pair {
  display: inline-flex; align-items: baseline; gap: 6px;
  padding-left: 18px; margin-left: 4px;
  border-left: 1px solid var(--line-2);
  font-size: .74rem; letter-spacing: .12em; line-height: 1;
}
.lang-pair__item { color: var(--faint); transition: color .2s var(--ease); }
.lang-pair__item:hover { color: var(--ink); }
.lang-pair__item.is-active { color: var(--ink); font-weight: 600; }
.lang-pair__sep { color: var(--line-2); }
.topbar.is-dark:not(.is-solid) .lang-pair { border-left-color: rgba(255, 255, 255, .16); }
.topbar.is-dark:not(.is-solid) .lang-pair__item { color: rgba(255, 255, 255, .45); }
.topbar.is-dark:not(.is-solid) .lang-pair__item:hover { color: #fff; }
.topbar.is-dark:not(.is-solid) .lang-pair__item.is-active { color: #fff; }
.topbar.is-dark:not(.is-solid) .lang-pair__sep { color: rgba(255, 255, 255, .3); }
@media (max-width: 899px) {
  .lang-pair { padding-left: 0; border-left: 0; margin-left: 0; font-size: .78rem; gap: 7px; }
}

/* ---------- 26. 英文排版 ---------- */
html[lang="en"] {
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
  --sans: "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
}
html[lang="en"] body { line-height: 1.72; }
html[lang="en"] .hero h1 { font-size: clamp(1.85rem, 4.2vw, 3.35rem); line-height: 1.18; letter-spacing: -.012em; }
html[lang="en"] .hero__lead { max-width: 48ch; }
html[lang="en"] .h2, html[lang="en"] .pagehead h1 { letter-spacing: -.01em; }
html[lang="en"] .lead { max-width: 60ch; }
html[lang="en"] .prose { line-height: 1.85; max-width: 66ch; }
html[lang="en"] .prose h2 { margin-top: 2em; }
html[lang="en"] .card h3, html[lang="en"] .note-item h3, html[lang="en"] .quote p { letter-spacing: -.008em; }
html[lang="en"] .brand__cn { letter-spacing: .02em; font-size: .96rem; }
html[lang="en"] .brand__en { letter-spacing: .16em; }

/* 小屏：eyebrow 改为行内流，避免圆点单独成行 */
@media (max-width: 600px) {
  .hero__eyebrow { display: block; }
  .hero__eyebrow .dot { display: inline-block; margin-right: 9px; vertical-align: middle; }
}

/* 英文首屏两行之间多留一点呼吸 */
html[lang="en"] .hero h1 .l2 { margin-top: .24em; }

/* ---------- 27. 论文页 ---------- */
.paper-head { border-bottom: 1px solid var(--line); padding-bottom: 26px; }
.paper-eyebrow { font-size: .7rem; font-weight: 600; letter-spacing: .24em; text-transform: uppercase; color: var(--gold-ink); }
.paper-head h1 { margin-top: 14px; font-family: var(--serif); font-size: clamp(1.55rem, 3.3vw, 2.35rem); line-height: 1.44; }
.paper-subtitle { margin-top: 12px; color: var(--faint); font-size: .84rem; line-height: 1.75; font-style: italic; }
.paper-meta { margin-top: 22px; display: grid; gap: 10px 28px; grid-template-columns: repeat(auto-fit, minmax(196px, 1fr)); font-size: .82rem; line-height: 1.7; }
.paper-meta > div { display: flex; gap: 10px; }
.paper-meta dt { color: var(--faint); flex: none; }
.paper-meta dd { margin: 0; color: var(--ink-2); }
.paper-abstract { margin-top: 24px; padding: 20px 22px; background: var(--paper-2); border: 1px solid var(--line); border-left: 2px solid var(--gold); border-radius: 0 var(--r) var(--r) 0; font-size: .93rem; line-height: 1.95; color: var(--ink-2); }
.paper-keywords { margin-top: 14px; font-size: .87rem; color: var(--muted); }
.paper-body { margin-top: 34px; }
.prose h4 { margin-top: 1.7em; font-family: var(--serif); font-size: 1.02rem; color: var(--ink); }
.paper-figure { margin-block: 2.2em; }
.paper-figure svg { width: 100%; height: auto; color: var(--jade-2); background: var(--paper-2); border: 1px solid var(--line); border-radius: var(--r); padding: 14px 12px; }
.paper-figure figcaption { margin-top: 10px; font-size: .8rem; color: var(--faint); line-height: 1.85; }
.paper-claims { margin-block: 1.6em; padding: 4px 0 4px 20px; border-left: 2px solid var(--jade); display: grid; gap: 10px; }
.paper-claims p { margin: 0; font-size: .96rem; }
.paper-refs { margin-top: 1.2em; padding-left: 1.7em; font-size: .84rem; line-height: 1.95; color: var(--muted); }
.paper-refs li { margin-bottom: .5em; }
.paper-refs li::marker { color: var(--gold-ink); font-variant-numeric: tabular-nums; }
.paper-cite { padding: 18px 20px; background: var(--paper-3); border-radius: var(--r); font-size: .86rem; line-height: 1.9; }
.paper-cite p + p { margin-top: 6px; }
@media (max-width: 640px) { .paper-meta { grid-template-columns: 1fr; } }

/* 论文元信息：分类号独占一行，避免在窄格里断成两行 */
.paper-meta > div:last-child { grid-column: 1 / -1; }

/* 论文内表格：六列在正文宽度里需要更紧凑的字号与内边距 */
.paper-body { max-width: 74ch; }
.paper-body table { font-size: .78rem; min-width: 640px; }
.paper-body th, .paper-body td { padding: 10px 12px; }
.paper-body thead th { font-size: .64rem; letter-spacing: .1em; }
.paper-body tbody th { width: auto; white-space: nowrap; }

/* 参考文献里的期刊名用斜体，不套用正文 em 的强调样式 */
.paper-refs em { font-style: italic; color: inherit; border-bottom: 0; }

/* 论文元信息：桌面端三栏 + 分类号独占一行 */
@media (min-width: 720px) {
  .paper-meta { grid-template-columns: 1.45fr 1fr 0.8fr; }
}

/* 论文表格：桌面端允许比正文栏更宽，六列英文才排得开 */
@media (min-width: 1100px) {
  .paper-body .table-wrap {
    width: min(calc(100vw - 2 * var(--pad)), 1040px);
    margin-left: 50%;
    transform: translateX(-50%);
  }
  .paper-body table { min-width: 0; }
  .paper-body table { font-size: .82rem; }
}


/* 论文修订说明 */
.paper-revision {
  padding: 14px 18px;
  background: var(--paper-3);
  border-left: 2px solid var(--jade);
  border-radius: 0 var(--r) var(--r) 0;
  font-size: .86rem; line-height: 1.9; color: var(--muted);
}


/* 首屏 meta 三格改为可点入口 */
.hero__meta a {
  color: inherit; text-decoration: none;
  border-bottom: 1px solid rgba(216, 168, 74, .28);
  padding-bottom: 2px;
  transition: border-color .2s, color .2s;
}
.hero__meta a:hover, .hero__meta a:focus-visible {
  color: #E8EDEA; border-bottom-color: #D8A84A;
}
.hero__meta a b { color: #D8A84A; }

/* 笔记里的通栏图（宽图不出窄栏） */
.prose .fig-wide {
  width: min(1180px, calc(100vw - 40px));
  margin: 2.4em 0 2.4em 50%;
  transform: translateX(-50%);
}
.prose .fig-wide img {
  width: 100%; height: auto; display: block;
  background: var(--paper-2);
  border: 1px solid var(--line); border-radius: var(--r);
}
.prose .fig-wide figcaption {
  margin-top: 10px; font-size: .8rem; color: var(--faint); line-height: 1.85;
  text-align: center;
}
@media (max-width: 640px) {
  .prose .fig-wide { width: calc(100vw - 24px); }
}

.prose .fig-wide svg { border: 1px solid var(--line); border-radius: var(--r); }

/* 语言切换：视觉尺寸不变，扩大命中区到 24px（WCAG 2.2 AA 2.5.8） */
.lang-pair__item { position: relative; }
.lang-pair__item::after {
  content: ""; position: absolute; inset: -7px -6px;
}

/* 页脚与首屏入口的点击高度补到 24px（WCAG 2.2 AA 2.5.8） */
.foot__top li a { display: inline-block; padding-block: 3px; }
.hero__meta a { padding-block: 2px; }

/* 页脚整块文字链接补足命中高度 */
.foot__top a { display: inline-block; padding-block: 3px; }

/* 邮件链接补足命中高度（不改排版高度） */
a[href^="mailto:"] { padding-block: 4px; }

/* 页脚三栏：间距与可发现性 */
.foot ul { margin-top: 12px; gap: 8px; }
.foot ul a:hover, .foot ul a:focus-visible { text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }