/* =========================================================
   符杰 · 学术个人网站
   视觉方向：学术刊物——米白纸面、炭黑正文、少量砖红强调、细线与栏目编号
   改配色：只需修改 :root 中的变量
   ========================================================= */

:root {
  --paper: #f6f1e7;
  --paper-2: #efe7d8;
  --ink: #1f1c19;
  --ink-2: #47413b;
  --muted: #6b6259;
  --rule: #d8cdb9;
  --rule-strong: #1f1c19;
  --accent: #9a3324;
  --accent-soft: #f0dcd2;

  --serif-zh: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --sans-zh: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --serif-latin: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;

  --wrap: 1120px;
  --gutter: clamp(16px, 4vw, 40px);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 72px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans-zh);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration-color: var(--rule);
  text-underline-offset: 3px;
  transition: color 0.15s, text-decoration-color 0.15s;
}

a:hover {
  color: var(--accent);
  text-decoration-color: currentColor;
}

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

h1,
h2,
h3 {
  font-family: var(--serif-zh);
  font-weight: 700;
  line-height: 1.3;
  margin: 0;
}

p {
  margin: 0;
}

.wrap {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 8px;
  background: var(--ink);
  color: var(--paper);
  padding: 8px 14px;
  z-index: 100;
}

.skip-link:focus {
  left: 8px;
}

.latin,
.num {
  font-family: var(--serif-latin);
}

/* ---------- 刊头导航 ---------- */
.masthead {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule);
}

.masthead .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 60px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  text-decoration: none;
  white-space: nowrap;
}

.brand-zh {
  font-family: var(--serif-zh);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: 0.12em;
}

.brand-en {
  font-family: var(--serif-latin);
  font-size: 14px;
  color: var(--muted);
  font-style: italic;
}

.nav {
  display: flex;
  align-items: center;
  gap: 4px;
  overflow-x: auto;
  scrollbar-width: none;
}

.nav::-webkit-scrollbar {
  display: none;
}

.nav a {
  display: block;
  padding: 6px 10px;
  font-size: 15px;
  text-decoration: none;
  color: var(--ink-2);
  border-bottom: 2px solid transparent;
  white-space: nowrap;
}

.nav a:hover,
.nav a[aria-current="true"] {
  color: var(--ink);
  border-bottom-color: var(--accent);
}

.nav .lang {
  margin-left: 8px;
  font-family: var(--serif-latin);
  border: 1px solid var(--rule);
  border-radius: 2px;
  padding: 3px 9px;
}

.nav .lang:hover {
  border-color: var(--accent);
}

/* ---------- 首屏 ---------- */
.hero {
  padding: clamp(48px, 9vw, 104px) 0 clamp(40px, 6vw, 64px);
  border-bottom: 1px solid var(--rule-strong);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);
  gap: clamp(32px, 6vw, 80px);
  align-items: end;
}

.eyebrow {
  font-family: var(--serif-latin);
  font-size: 13px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
}

.hero-text {
  container-type: inline-size;
}

.hero h1 {
  font-size: clamp(26px, 4.4vw, 50px);
  font-size: min(50px, calc(100cqi / 17.4));
  line-height: 1.28;
  letter-spacing: 0.01em;
}

.hero h1 .line {
  display: block;
}

.hero h1 em {
  font-style: normal;
  white-space: nowrap;
  color: var(--accent);
}

.hero-deck {
  margin-top: 24px;
  max-width: 38em;
  font-size: clamp(16px, 1.6vw, 18px);
  color: var(--ink-2);
}

.dossier {
  border-top: 3px double var(--rule-strong);
  padding-top: 14px;
  font-size: 14px;
}

.dossier-name {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 14px;
}

.monogram {
  flex: none;
  width: 56px;
  height: 56px;
  display: grid;
  place-items: center;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--serif-zh);
  font-size: 26px;
  font-weight: 700;
}

.dossier-name strong {
  display: block;
  font-family: var(--serif-zh);
  font-size: 22px;
  letter-spacing: 0.1em;
}

.dossier-name div span {
  font-family: var(--serif-latin);
  font-style: italic;
  color: var(--muted);
}

.dossier dl {
  margin: 0;
  display: grid;
  grid-template-columns: 4.2em 1fr;
  border-top: 1px solid var(--rule);
}

.dossier dt,
.dossier dd {
  padding: 8px 0;
  border-bottom: 1px solid var(--rule);
  margin: 0;
}

.dossier dt {
  color: var(--muted);
}

/* ---------- 数字条 ---------- */
.figures {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  border-bottom: 1px solid var(--rule);
}

.figure {
  padding: 22px 18px 22px 0;
  border-right: 1px solid var(--rule);
}

.figure + .figure {
  padding-left: 18px;
}

.figure:last-child {
  border-right: 0;
}

.figure .num {
  display: block;
  font-size: clamp(30px, 3.4vw, 40px);
  line-height: 1.1;
  color: var(--ink);
}

.figure .num small {
  font-family: var(--sans-zh);
  font-size: 14px;
  margin-left: 2px;
  color: var(--ink-2);
}

.figure p {
  margin-top: 6px;
  font-size: 14px;
  line-height: 1.55;
  color: var(--ink-2);
}

.figure .sub {
  display: block;
  color: var(--muted);
  font-size: 13px;
}

/* ---------- 栏目 ---------- */
.section {
  padding: clamp(56px, 8vw, 96px) 0 0;
}

.section-head {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 16px;
  align-items: baseline;
  border-top: 1px solid var(--rule-strong);
  padding-top: 14px;
  margin-bottom: clamp(28px, 4vw, 44px);
}

.section-no {
  font-family: var(--serif-latin);
  font-size: 15px;
  color: var(--accent);
}

.section-kicker {
  font-family: var(--serif-latin);
  font-style: italic;
  font-size: 14px;
  color: var(--muted);
}

.section-head h2 {
  font-size: clamp(24px, 3vw, 32px);
  margin-top: 2px;
}

.section-intro {
  max-width: 40em;
  margin-top: 10px;
  color: var(--ink-2);
}

/* ---------- 研究方向 ---------- */
.research {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
}

.area {
  padding: 0 clamp(16px, 2.4vw, 32px);
  border-left: 1px solid var(--rule);
}

.area:first-child {
  padding-left: 0;
  border-left: 0;
}

.area-no {
  font-family: var(--serif-latin);
  font-size: 44px;
  line-height: 1;
  color: var(--rule);
}

.area h3 {
  font-size: 21px;
  margin: 14px 0 12px;
}

.area .question {
  font-family: var(--serif-zh);
  font-size: 17px;
  line-height: 1.7;
  color: var(--ink);
  padding-left: 12px;
  border-left: 2px solid var(--accent);
  margin-bottom: 14px;
}

.area .desc {
  font-size: 15px;
  color: var(--ink-2);
}

.area ul {
  list-style: none;
  padding: 0;
  margin: 16px 0 0;
  font-size: 14px;
  color: var(--ink-2);
}

.area li {
  padding: 7px 0;
  border-top: 1px dotted var(--rule);
}

.area li::before {
  content: "→ ";
  color: var(--accent);
}

.area.foundation .tag {
  border-color: var(--muted);
  color: var(--muted);
}

/* 研究脉络 */
.path {
  list-style: none;
  padding: 0;
  margin: 0 0 clamp(40px, 6vw, 64px);
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0 clamp(16px, 2.4vw, 32px);
  counter-reset: path;
}

.path li {
  position: relative;
  padding-top: 22px;
  border-top: 2px solid var(--rule);
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-2);
}

.path li::before {
  content: "";
  position: absolute;
  top: -7px;
  left: 0;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--muted);
}

.path li.now {
  border-top-color: var(--accent);
}

.path li.now::before {
  background: var(--accent);
  border-color: var(--accent);
}

.path-when {
  display: block;
  font-family: var(--serif-latin);
  font-size: 15px;
  color: var(--muted);
}

.path li.now .path-when {
  color: var(--accent);
}

.path strong {
  display: block;
  margin: 2px 0 6px;
  font-family: var(--serif-zh);
  font-size: 17px;
  color: var(--ink);
}

.tag {
  display: inline-block;
  font-size: 12px;
  line-height: 1.6;
  padding: 0 7px;
  border: 1px solid var(--accent);
  color: var(--accent);
  border-radius: 2px;
  vertical-align: 3px;
  margin-left: 6px;
  font-family: var(--sans-zh);
  font-weight: 400;
}

/* ---------- 代表成果 ---------- */
.featured {
  list-style: none;
  padding: 0;
  margin: 0;
  counter-reset: feat;
}

.featured li {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr) minmax(0, 15em);
  gap: 16px;
  padding: 22px 0;
  border-bottom: 1px solid var(--rule);
  counter-increment: feat;
}

.featured li::before {
  content: counter(feat, decimal-leading-zero);
  font-family: var(--serif-latin);
  font-size: 15px;
  color: var(--muted);
  padding-top: 4px;
}

.featured h3 {
  font-size: 19px;
  line-height: 1.5;
}

.featured .why {
  margin-top: 8px;
  font-size: 15px;
  color: var(--ink-2);
}

.featured .meta {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.6;
}

.featured .meta .type {
  display: block;
  color: var(--accent);
  margin-bottom: 4px;
}

.featured .meta strong {
  color: var(--ink);
  font-weight: 600;
}

/* ---------- 成果目录 ---------- */
.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 8px;
}

.chip {
  font: inherit;
  font-size: 14px;
  padding: 5px 14px;
  border: 1px solid var(--rule);
  background: transparent;
  color: var(--ink-2);
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.15s;
}

.chip:hover {
  border-color: var(--ink);
  color: var(--ink);
}

.chip[aria-pressed="true"] {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}

.chip .count {
  font-family: var(--serif-latin);
  margin-left: 4px;
  opacity: 0.7;
}

.catalog-note {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 8px;
}

.catalog-group {
  margin-top: 28px;
}

.catalog-group > h3 {
  font-size: 17px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--rule-strong);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.catalog-group > h3 small {
  font-family: var(--serif-latin);
  font-weight: 400;
  font-size: 14px;
  color: var(--muted);
}

.refs {
  list-style: none;
  padding: 0;
  margin: 0;
}

.refs li {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid var(--rule);
  font-size: 15px;
  line-height: 1.7;
}

.refs .yr {
  font-family: var(--serif-latin);
  color: var(--muted);
}

.refs .title {
  font-weight: 600;
  color: var(--ink);
}

.refs .authors {
  color: var(--ink-2);
}

.refs .authors b {
  font-weight: 600;
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-underline-offset: 3px;
}

.refs .venue {
  color: var(--ink-2);
}

.refs .venue i {
  font-family: var(--serif-latin);
}

.refs .badges {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 6px;
}

.badge {
  font-size: 12px;
  line-height: 1.7;
  padding: 0 8px;
  background: var(--paper-2);
  color: var(--ink-2);
  border-radius: 2px;
}

.badge.strong {
  background: var(--accent-soft);
  color: var(--accent);
}

.refs a.doi {
  font-family: var(--serif-latin);
  font-size: 13px;
}

.catalog-group[hidden] {
  display: none;
}

/* 政策咨询报告概述 */
.policy-summary {
  max-width: 46em;
  padding: 20px 0 4px;
  font-size: 16px;
  line-height: 1.9;
  color: var(--ink-2);
}

.policy-summary strong {
  color: var(--accent);
  font-weight: 600;
}

/* ---------- 项目 ---------- */
.projects {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 clamp(24px, 4vw, 56px);
}

.proj-group h3 {
  font-size: 16px;
  font-family: var(--sans-zh);
  font-weight: 600;
  color: var(--accent);
  margin: 0 0 4px;
  padding-top: 22px;
}

.proj-group:first-child h3,
.proj-group:nth-child(2) h3 {
  padding-top: 0;
}

.proj {
  padding: 12px 0;
  border-bottom: 1px solid var(--rule);
  font-size: 15px;
}

.proj .when {
  font-family: var(--serif-latin);
  font-size: 13px;
  color: var(--muted);
}

.proj .name {
  font-weight: 600;
  line-height: 1.6;
}

.proj .src {
  color: var(--ink-2);
  font-size: 14px;
}

/* ---------- 经历 ---------- */
.cv-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: clamp(32px, 5vw, 72px);
}

.cv-grid h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.timeline {
  list-style: none;
  padding: 0;
  margin: 0;
}

.timeline li {
  display: grid;
  grid-template-columns: 9.5em minmax(0, 1fr);
  gap: 16px;
  padding: 14px 0;
  border-top: 1px solid var(--rule);
}

.timeline .when {
  font-family: var(--serif-latin);
  color: var(--muted);
  font-size: 15px;
}

.timeline strong {
  display: block;
  font-weight: 600;
}

.timeline span {
  color: var(--ink-2);
  font-size: 15px;
}

.service {
  list-style: none;
  padding: 0;
  margin: 0 0 32px;
}

.service li {
  padding: 12px 0;
  border-top: 1px solid var(--rule);
  font-size: 15px;
}

.service i {
  font-family: var(--serif-latin);
}

.service span {
  display: block;
  color: var(--muted);
  font-size: 14px;
}

/* ---------- 联系 ---------- */
.contact {
  margin-top: clamp(56px, 8vw, 96px);
  background: var(--ink);
  color: var(--paper);
  padding: clamp(40px, 6vw, 72px) 0;
}

.contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 32px;
  align-items: end;
}

.contact .section-no {
  color: #e5a593;
}

.contact h2 {
  font-size: clamp(26px, 3.4vw, 38px);
  margin: 8px 0 14px;
}

.contact p {
  color: #d6cdbf;
  max-width: 34em;
}

.mail {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.mail a {
  font-family: var(--serif-latin);
  font-size: clamp(20px, 2.4vw, 26px);
  color: var(--paper);
  text-decoration-color: #e5a593;
}

.mail a:hover {
  color: #e5a593;
}

.copy-btn {
  font: inherit;
  font-size: 14px;
  padding: 6px 14px;
  background: transparent;
  color: var(--paper);
  border: 1px solid #6c645b;
  border-radius: 2px;
  cursor: pointer;
}

.copy-btn:hover {
  border-color: var(--paper);
}

.contact :focus-visible {
  outline-color: #e5a593;
}

footer {
  background: var(--ink);
  color: #a99f92;
  font-size: 13px;
  padding: 18px 0 28px;
  border-top: 1px solid #3a3530;
}

footer .wrap {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px;
}

footer a {
  color: #d6cdbf;
}

/* ---------- 进场动效 ---------- */
.js .reveal {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.js .reveal.in {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }

  .figures {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .figure:nth-child(3) {
    border-right: 0;
  }

  .figure:nth-child(4) {
    padding-left: 0;
  }

  .figure:nth-child(n + 4) {
    border-top: 1px solid var(--rule);
  }

  .research {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .path {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px 24px;
  }

  .area,
  .area:first-child {
    padding: 0;
    border-left: 0;
  }

  .featured li {
    grid-template-columns: 40px minmax(0, 1fr);
  }

  .featured .meta {
    grid-column: 2;
  }

  .projects,
  .cv-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .proj-group:nth-child(2) h3 {
    padding-top: 22px;
  }
}

@media (max-width: 640px) {
  .masthead .wrap {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding-top: 10px;
  }

  .nav {
    margin: 0 calc(var(--gutter) * -1);
    padding: 0 var(--gutter);
  }

  .nav a {
    padding: 8px 6px;
  }

  .figures {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .figure,
  .figure + .figure {
    padding: 18px 12px 18px 0;
    border-right: 0;
    border-top: 1px solid var(--rule);
  }

  .figure:nth-child(even) {
    padding-left: 12px;
    border-left: 1px solid var(--rule);
  }

  .figure:first-child,
  .figure:nth-child(2) {
    border-top: 0;
  }

  .figure:last-child {
    grid-column: 1 / -1;
    border-left: 0;
    padding-left: 0;
  }

  .hero h1 {
    font-size: 27px;
  }

  .nav a {
    font-size: 14px;
  }

  .section-head {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .refs li {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  .path {
    grid-template-columns: 1fr;
  }

  .timeline li {
    grid-template-columns: 1fr;
    gap: 2px;
  }
}

/* ---------- 打印：生成一份干净的成果清单 ---------- */
@media print {
  .masthead,
  .toolbar,
  .copy-btn,
  .skip-link {
    display: none !important;
  }

  body {
    background: #fff;
    font-size: 11pt;
  }

  .catalog-group[hidden] {
    display: block !important;
  }

  .reveal {
    opacity: 1 !important;
    transform: none !important;
  }

  .contact,
  footer {
    background: #fff;
    color: #000;
  }

  .contact p,
  .mail a {
    color: #000;
  }

  .section {
    padding-top: 24px;
  }

  .featured li,
  .refs li,
  .proj {
    break-inside: avoid;
  }
}