/* ===================================================================
   科普作品集 — 样式（Tech-Editorial 改版）
   深色 HERO + 纸感正文 + 等宽数据标签 + 内联章节序号
   =================================================================== */

:root {
  --paper:    #F4F1E9;
  --paper-2:  #ECE6D8;
  --paper-3:  #E3DCCB;
  --ink:      #16201A;
  --ink-2:    #4A5249;
  --ink-3:    #6A7167;
  --moss:     #1F3A2E;
  --moss-2:   #2C5544;
  --moss-lt:  #6FA98C;
  --ochre:    #9A6326;
  --ochre-lt: #C99A5B;

  --rule:     rgba(31, 58, 46, .16);
  --rule-2:   rgba(31, 58, 46, .34);

  --s1: 4px; --s2: 8px; --s3: 12px; --s4: 16px;
  --s5: 24px; --s6: 36px; --s7: 56px; --s8: 80px; --s9: 112px;

  --maxw: 1240px;
  --lead: 1.78;

  --serif: "Source Han Serif SC", "Noto Serif CJK SC", "Songti SC", "STSong", SimSun, Georgia, serif;
  --sans:  "Source Han Sans SC", "Noto Sans CJK SC", "PingFang SC", "Microsoft YaHei", -apple-system, sans-serif;
  --mono:  ui-monospace, "SF Mono", "Cascadia Mono", Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
section { scroll-margin-top: 76px; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: var(--lead);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* 正文科技底纹：极淡点阵 */
body::before {
  content: "";
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background-image: radial-gradient(rgba(31, 58, 46, .05) 1px, transparent 1.4px);
  background-size: 22px 22px;
  opacity: .55;
}

.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 var(--s5); position: relative; z-index: 1; }

a { color: var(--ochre); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

.skip {
  position: absolute; left: -9999px; top: 0; z-index: 99;
  background: var(--moss); color: var(--paper); padding: var(--s3) var(--s4);
  font-family: var(--sans); font-size: 14px;
}
.skip:focus { left: var(--s4); top: var(--s4); }

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

/* ================= 导航 ================= */
.nav {
  position: sticky; top: 0; z-index: 40;
  background: rgba(244, 241, 233, .9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--rule);
}
.nav-in { display: flex; align-items: center; gap: var(--s5); height: 60px; }
.nav-brand { font-family: var(--sans); font-size: 13px; letter-spacing: .1em; color: var(--ink-3); text-transform: uppercase; }
.nav-brand b { color: var(--moss); font-weight: 600; }
.nav-links { margin-left: auto; display: flex; gap: var(--s5); }
.nav-links a {
  font-family: var(--sans); font-size: 14px; color: var(--ink-2);
  position: relative; padding: 4px 0;
}
.nav-links a::after {
  content: ""; position: absolute; left: 0; right: 100%; bottom: 0;
  height: 1px; background: var(--ochre); transition: right .28s ease;
}
.nav-links a:hover { color: var(--ink); text-decoration: none; }
.nav-links a:hover::after { right: 0; }

/* ================= HERO（深色科技带） ================= */
.hero {
  position: relative; overflow: hidden;
  color: #ECE6D8;
  background:
    radial-gradient(120% 120% at 82% 0%, rgba(111, 169, 140, .18), transparent 52%),
    radial-gradient(90% 130% at 8% 100%, rgba(201, 154, 91, .14), transparent 55%),
    linear-gradient(150deg, #0E1612 0%, #15231B 55%, #0E1612 100%);
  padding: var(--s9) 0 var(--s8);
  border-bottom: 1px solid rgba(236, 230, 216, .12);
}
.hero::before {
  content: ""; position: absolute; inset: 0; z-index: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(236, 230, 216, .045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(236, 230, 216, .045) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(120% 90% at 50% 0%, #000 40%, transparent 92%);
}
.hero-grid { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: var(--s7); align-items: start; }
.hero-left, .hero-right { position: relative; z-index: 1; }

.eyebrow {
  font-family: var(--mono); font-size: 12px; letter-spacing: .2em;
  text-transform: uppercase; color: var(--ochre-lt);
  display: flex; align-items: center; gap: var(--s3); margin-bottom: var(--s5);
}
.eyebrow::after { content: ""; height: 1px; flex: 1; background: rgba(236, 230, 216, .2); }

.hero h1 {
  font-family: var(--serif);
  font-size: clamp(1.8rem, 4.2vw, 3rem);
  line-height: 1.3; margin: 0 0 var(--s5);
  font-weight: 600; letter-spacing: -.01em;
  color: #F6F2E8;
}
.hero h1 .h1-gap { display: inline-block; width: .32em; }

.lede { font-family: var(--sans); font-size: 16.5px; line-height: 1.85; color: rgba(236, 230, 216, .82); margin: 0 0 var(--s6); }
.lede .ln { display: block; }
.lede .ln2 { display: block; margin-top: var(--s3); color: #F6F2E8; font-weight: 600; }

.hero-metrics { display: flex; gap: var(--s6); flex-wrap: wrap; }
.hero-metrics div { display: flex; flex-direction: column; gap: 2px; padding-left: var(--s4); border-left: 2px solid var(--moss-lt); }
.hero-metrics span { font-family: var(--mono); font-size: 11px; letter-spacing: .14em; text-transform: uppercase; color: rgba(236, 230, 216, .6); }
.hero-metrics strong { font-size: 22px; font-weight: 600; color: #F6F2E8; font-variant-numeric: tabular-nums; line-height: 1.1; }

/* Hero 荣誉面板 */
.hero-right { border-left: 1px solid rgba(236, 230, 216, .18); padding-left: var(--s6); }
.hr-label { font-family: var(--mono); font-size: 11px; letter-spacing: .2em; text-transform: uppercase; color: var(--ochre-lt); margin-bottom: var(--s4); }
.honor-stack { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 var(--s4); }
.honor-stack li { padding: var(--s3) 0; border-bottom: 1px dashed rgba(236, 230, 216, .16); }
.honor-stack .hk { display: inline-block; font-family: var(--mono); font-size: 11px; letter-spacing: .08em; color: #0E1612; background: var(--ochre-lt); padding: 2px 8px; border-radius: 2px; margin-bottom: 6px; }
.honor-stack .ht { display: block; font-family: var(--serif); font-size: 17px; font-weight: 600; color: #F6F2E8; }
.honor-stack .hd { display: block; font-family: var(--sans); font-size: 12.5px; color: rgba(236, 230, 216, .66); margin-top: 2px; }

/* ================= 章节 ================= */
section { padding: var(--s8) 0; }
section.tight { padding: var(--s6) 0; }

.sec-head { margin-bottom: var(--s7); }
.sec-tit { display: flex; align-items: baseline; gap: var(--s4); flex-wrap: wrap; }
.sec-tit .no {
  font-family: var(--mono); font-size: clamp(1.3rem, 2.4vw, 1.9rem);
  font-weight: 700; color: var(--ochre); letter-spacing: .02em;
  line-height: 1;
}
.sec-head h2 {
  font-family: var(--serif);
  font-size: clamp(1.6rem, 3vw, 2.4rem); margin: 0;
  font-weight: 600; letter-spacing: -.01em;
}
.sec-head p { color: var(--ink-2); max-width: 64ch; margin: var(--s3) 0 0; font-family: var(--sans); }

/* ================= 简介区 ================= */
.about {
  display: grid; grid-template-columns: 1fr 1fr; gap: var(--s8);
  padding-top: var(--s7); border-top: 1px solid var(--rule);
}
.about > div { display: flex; flex-direction: column; justify-content: space-between; }
.about > div > *:last-child { margin-bottom: 0; }
.about h3 { font-family: var(--serif); font-size: 21px; margin: 0 0 var(--s4); font-weight: 600; }
.about p { margin: 0 0 var(--s4); color: var(--ink-2); font-family: var(--sans); }
.about p b { color: var(--ink); font-weight: 600; }

/* ================= 筛选 ================= */
.filters {
  position: sticky; top: 60px; z-index: 30;
  background: var(--paper);
  padding: var(--s4) 0;
  border-bottom: 1px solid var(--rule);
  margin-bottom: var(--s7);
}
.filter-in { display: flex; align-items: center; gap: var(--s4); flex-wrap: wrap; }
.filter-in .lab { font-family: var(--mono); font-size: 11px; letter-spacing: .16em; text-transform: uppercase; color: var(--ink-3); white-space: nowrap; flex: 0 0 auto; }
/* 「精选」标签与其 chips 绑成一组，空间不足时整组换行，不会拆散 */
.pick-group { display: flex; align-items: center; gap: var(--s3); margin-left: auto; flex: 0 0 auto; }
.chips { display: flex; gap: var(--s2); flex-wrap: wrap; }
.chip {
  font-family: var(--sans); font-size: 13px;
  padding: 6px 14px; border: 1px solid var(--rule-2);
  border-radius: 999px; background: transparent; color: var(--ink-2);
  cursor: pointer; transition: all .2s ease;
  white-space: nowrap; flex: 0 0 auto;
}
.chip:hover { border-color: var(--moss-2); color: var(--ink); }
.chip[aria-pressed="true"] { background: var(--moss); border-color: var(--moss); color: var(--paper); }
.chip .n { opacity: .6; margin-left: 5px; font-variant-numeric: tabular-nums; }
.chip { white-space: nowrap; }

/* ================= 卡片网格 ================= */
.grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--s4); }

.card {
  background: var(--paper-2);
  border: 1px solid var(--rule);
  display: flex; flex-direction: column;
  transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
  position: relative; overflow: hidden;
}
.card::after {
  content: ""; position: absolute; left: 0; top: 0; height: 3px; right: 0;
  background: linear-gradient(90deg, var(--moss-2), var(--ochre));
  transform: scaleX(0); transform-origin: left; transition: transform .35s ease;
}
.card:hover { transform: translateY(-3px); border-color: var(--rule-2); box-shadow: 0 16px 36px -24px rgba(22, 32, 26, .55); }
.card:hover::after { transform: scaleX(1); }

.card-fig { position: relative; aspect-ratio: 3 / 2; overflow: hidden; background: var(--paper-3); border-bottom: 1px solid var(--rule); }
.card-fig img { width: 100%; height: 100%; object-fit: cover; transition: transform .6s cubic-bezier(.2, .7, .3, 1); }
.card:hover .card-fig img { transform: scale(1.04); }

.card-meta { position: absolute; left: 0; bottom: 0; display: flex; gap: var(--s2); flex-wrap: wrap; padding: var(--s3); }
.badge { font-family: var(--mono); font-size: 10.5px; letter-spacing: .08em; padding: 3px 9px; border-radius: 2px; background: rgba(22, 32, 26, .8); color: var(--paper); backdrop-filter: blur(3px); }
.badge.hot { background: var(--ochre); color: #fff; }

.card-body { padding: var(--s4); display: flex; flex-direction: column; flex: 1; }

.card-kicker { font-family: var(--mono); font-size: 11px; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); display: flex; gap: var(--s3); align-items: baseline; }
.card-kicker .pl { color: var(--moss-2); }
.card-kicker .dt { font-variant-numeric: tabular-nums; }

.card h3 { font-family: var(--serif); font-size: 18px; line-height: 1.4; margin: var(--s3) 0 var(--s3); font-weight: 600; letter-spacing: -.005em; }
.card p {
  font-family: var(--sans); font-size: 14px; line-height: 1.72; color: var(--ink-2);
  margin: 0 0 var(--s3); flex: 1;
  display: -webkit-box; -webkit-line-clamp: 4; -webkit-box-orient: vertical; overflow: hidden;
}

.card-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: var(--s3); }
.card-tags span { font-family: var(--mono); font-size: 11px; padding: 2px 8px; border: 1px solid var(--rule); color: var(--ink-3); border-radius: 2px; }

.card-honors { margin: 0 0 var(--s3); padding: 0; list-style: none; }
.card-honors li { font-family: var(--sans); font-size: 12px; line-height: 1.55; color: var(--ochre); padding-left: 14px; position: relative; margin-bottom: 3px; }
.card-honors li::before { content: "◆"; position: absolute; left: 0; top: 0; font-size: 7px; line-height: 1.9; }

.card-foot { border-top: 1px solid var(--rule); padding-top: var(--s3); margin-top: auto; display: flex; align-items: center; gap: var(--s3); font-family: var(--mono); font-size: 12px; color: var(--ink-3); flex-wrap: wrap; }
.card-foot .num { font-variant-numeric: tabular-nums; }
.card-foot .go { margin-left: auto; color: var(--ochre); }
.card-foot .go::after { content: " →"; }

/* 书籍卡片 */
.card.book { background: var(--paper); }
.card.book .card-fig { aspect-ratio: 4 / 3; }
.card.book .card-body { padding: var(--s4) var(--s4) var(--s3); }
.card.book h3 { font-size: 19px; }
.card.book .sub { font-family: var(--sans); font-size: 12.5px; color: var(--ink-3); margin: -4px 0 var(--s3); }

/* ================= 服务 / 合作 ================= */
.grid.svc { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--s5); }
.svc-card { background: var(--paper); padding: var(--s5); border: 1px solid var(--rule); position: relative; transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease; }
.svc-card:hover { transform: translateY(-3px); border-color: var(--moss-2); box-shadow: 0 16px 40px -26px rgba(31, 58, 46, .5); }
.svc-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: var(--s4); }
.svc-no { font-family: var(--mono); font-size: 22px; font-weight: 700; color: var(--ochre); letter-spacing: .02em; }
.svc-ic { width: 30px; height: 30px; color: var(--moss-2); }
.svc-ic svg { width: 100%; height: 100%; display: block; }
.svc-card h3 { font-family: var(--serif); font-size: 20px; margin: 0 0 var(--s3); font-weight: 600; }
.svc-card p { font-family: var(--sans); font-size: 14.5px; line-height: 1.72; color: var(--ink-2); margin: 0; }

/* ================= 豆瓣读书链接 ================= */
.db {
  display: inline-block; margin: 0 0 var(--s3);
  font-family: var(--mono); font-size: 12px; letter-spacing: .04em;
  color: var(--ochre); border-bottom: 1px solid rgba(154, 99, 38, .35);
  padding-bottom: 2px; align-self: flex-start;
}
.db:hover { color: var(--moss); border-bottom-color: var(--moss); text-decoration: none; }

/* ================= 联系（深色收尾带） ================= */
#contact {
  position: relative; overflow: hidden;
  color: #ECE6D8;
  background:
    radial-gradient(90% 120% at 88% 10%, rgba(111, 169, 140, .16), transparent 55%),
    linear-gradient(140deg, #101A15 0%, #16241C 60%, #101A15 100%);
  padding: var(--s8) 0;
}
#contact::before {
  content: ""; position: absolute; inset: 0; z-index: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(236, 230, 216, .04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(236, 230, 216, .04) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(110% 80% at 50% 0%, #000 30%, transparent 92%);
}
.contact-in {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: var(--s8); align-items: center;
}
.ct-left h2 {
  font-family: var(--serif); font-size: clamp(1.5rem, 2.8vw, 2.2rem);
  margin: 0 0 var(--s3); font-weight: 600; color: #F6F2E8; letter-spacing: -.01em;
}
.ct-left p { margin: 0; color: rgba(236, 230, 216, .78); max-width: 52ch; font-family: var(--sans); }

.wc-box {
  border: 1px solid rgba(236, 230, 216, .2); border-radius: 4px;
  padding: var(--s5); background: rgba(14, 22, 18, .5);
  min-width: 260px;
}
.wc-key { display: block; font-family: var(--mono); font-size: 11px; letter-spacing: .18em; text-transform: uppercase; color: var(--ochre-lt); margin-bottom: var(--s3); }
.wc-row { display: flex; align-items: center; gap: var(--s3); }
.wc-id {
  font-family: var(--mono); font-size: 26px; letter-spacing: .04em;
  color: #F6F2E8; background: none; border: none; padding: 0;
}
.wc-copy {
  font-family: var(--mono); font-size: 12px; letter-spacing: .08em;
  color: #F6F2E8; background: transparent; cursor: pointer;
  border: 1px solid rgba(236, 230, 216, .35); border-radius: 3px;
  padding: 5px 12px; transition: background .2s ease, border-color .2s ease;
}
.wc-copy:hover { background: var(--ochre); border-color: var(--ochre); }
.wc-note { display: block; margin-top: var(--s3); font-family: var(--sans); font-size: 12.5px; color: rgba(236, 230, 216, .55); }

.foot-note b { color: var(--ink); font-weight: 600; }

/* ================= 页脚 ================= */
footer { border-top: 1px solid var(--rule); padding: var(--s6) 0 var(--s8); margin-top: var(--s7); }
.foot-in { display: flex; justify-content: space-between; gap: var(--s5); flex-wrap: wrap; font-family: var(--mono); font-size: 12px; color: var(--ink-3); letter-spacing: .04em; }
.foot-note { margin: var(--s4) 0 0; font-family: var(--sans); font-size: 13px; color: var(--ink-3); }

/* ================= 空态 ================= */
.empty { text-align: center; padding: var(--s9) var(--s5); color: var(--ink-3); font-family: var(--sans); font-size: 14px; }

/* ================= 回到顶部 ================= */
#top {
  position: fixed; right: 22px; bottom: 22px; z-index: 50;
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--moss); color: var(--paper);
  border: none; cursor: pointer; font-size: 16px;
  opacity: 0; pointer-events: none; transition: opacity .3s ease, transform .3s ease;
  box-shadow: 0 8px 20px -10px rgba(22, 32, 26, .7);
}
#top.show { opacity: 1; pointer-events: auto; }
#top:hover { transform: translateY(-3px); }

/* ================= 滚动揭示 ================= */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ================= 响应式 ================= */
@media (max-width: 1200px) {
  .hero-grid { grid-template-columns: 1fr; gap: var(--s6); }
  .hero-right { border-left: none; border-top: 1px solid rgba(236, 230, 216, .18); padding-left: 0; padding-top: var(--s5); }
}
@media (max-width: 1100px) {
  .grid, .grid.svc { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (max-width: 900px) {
  .about { grid-template-columns: 1fr; gap: var(--s6); }
  .about > div { justify-content: flex-start; }
  .grid, .grid.svc { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--s4); }
  .contact-in { grid-template-columns: 1fr; gap: var(--s5); }
  .wc-box { min-width: 0; width: 100%; }
}
@media (max-width: 620px) {
  body { font-size: 16px; }
  .wrap { padding: 0 var(--s4); }
  section { padding: var(--s7) 0; scroll-margin-top: 64px; }

  /* 导航：不再隐藏，改为一行 + 横向滚动 */
  .nav-in { height: 52px; gap: var(--s3); }
  .nav-brand { font-size: 11.5px; letter-spacing: .06em; white-space: nowrap; }
  .brand-tail { display: none; }
  .nav-links {
    margin-left: auto; gap: var(--s4);
    overflow-x: auto; overscroll-behavior-x: contain;
    scrollbar-width: none; -ms-overflow-style: none;
    -webkit-overflow-scrolling: touch;
  }
  .nav-links::-webkit-scrollbar { display: none; }
  .nav-links a { font-size: 13px; white-space: nowrap; padding: 11px 0; }

  /* 筛选条：单行横向滚动，不再堆成好几行 */
  /* 筛选条：桌面一行，移动端分两行各自横滑 */
  .filters { top: 52px; padding: var(--s3) 0; }
  .filter-in { flex-wrap: wrap; gap: var(--s2) var(--s3); overflow-x: visible; }
  .pick-group { margin-left: 0; flex: 0 0 100%; margin-top: var(--s2); }
  .filter-in .chips {
    flex-wrap: nowrap; overflow-x: auto; min-width: 0; max-width: 100%;
    scrollbar-width: none; -ms-overflow-style: none;
    -webkit-overflow-scrolling: touch;
  }
  .chips::-webkit-scrollbar { display: none; }
  .chip { min-height: 40px; padding: 9px 14px; display: inline-flex; align-items: center; }

  .hero { padding: var(--s7) 0 var(--s6); }
  .hero h1 { margin-bottom: var(--s4); }
  .hero h1 .h1-gap { display: block; width: 0; height: 0; }
  .honor-stack { grid-template-columns: 1fr; }
  .grid, .grid.svc { grid-template-columns: 1fr; }
  .card-body { padding: var(--s3); }
  .svc-card { padding: var(--s4); }
  .about { padding-top: var(--s5); }
  #top { right: 14px; bottom: 14px; }
  .reveal { opacity: 1; transform: none; }
}
@media (max-width: 380px) {
  .hero h1 { font-size: 1.6rem; }
  .nav-links { gap: var(--s3); }
}

@media print {
  .nav, #top, .filters { display: none; }
  body { background: #fff; }
  body::before { display: none; }
  .hero { background: #fff; color: #000; }
  .card, .svc-card { break-inside: avoid; }
  .reveal { opacity: 1; transform: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
  .card:hover, .svc-card:hover { transform: none; }
  .reveal { opacity: 1; transform: none; }
}