/* ==========================================================================
   艾珊珊实验室 · Swiss International 风格
   网格 / 左对齐 / 大号字排 / 无渐变无阴影 / hairline 分隔
   ========================================================================== */

:root {
  --paper: #FFFFFF;
  --ink: #111111;
  --muted: #595959;
  --royal: #1B4FC4;      /* 主信号色 */
  --cyan: #0A93AD;       /* 次信号色 */
  --surface: #F4F4F4;
  --line: #E3E3E3;
  --line-dark: #111111;

  --font: Arial, "Microsoft YaHei", "微软雅黑", "PingFang SC", "Noto Sans SC", sans-serif;
  --serif: Georgia, "Times New Roman", "Songti SC", "SimSun", serif;
}

/* ---------- 基础 ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-padding-top: 90px; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.8;
  color: var(--ink);
  background: var(--paper);
}
h1, h2, h3, h4, p, ul, ol, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--ink); text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
::selection { background: #DCE6FB; }
:focus-visible { outline: 2px solid var(--royal); outline-offset: 2px; border-radius: 0; }

.container { width: min(1200px, 100% - 48px); margin-inline: auto; }

.skip-link {
  position: absolute; top: -56px; left: 16px; z-index: 200;
  padding: 10px 16px; background: var(--ink); color: #fff;
  transition: top 0.15s ease-out;
}
.skip-link:focus { top: 12px; color: #fff; }

/* ---------- 占位符 ---------- */
.ph { color: var(--muted); border-bottom: 1px dashed #B9B9B9; }
.ph-inline { color: var(--muted); border-bottom: 1px dashed #B9B9B9; }

/* ---------- 通用元素 ---------- */
.kicker {
  position: relative; z-index: 2;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: clamp(16px, 3vh, 28px);
}
.sec-desc { margin-top: 14px; font-size: 17px; color: var(--muted); }
.sec-head-row {
  display: flex; align-items: flex-end; justify-content: space-between;
  gap: 24px; flex-wrap: wrap;
}

.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 26px; font-size: 16px; font-weight: 700;
  border: 1px solid transparent; border-radius: 0;
  transition: background-color 0.15s ease-out, color 0.15s ease-out, border-color 0.15s ease-out;
}
.btn .arr { transition: transform 0.15s ease-out; }
.btn:hover .arr { transform: translateX(3px); }
.btn-fill { background: var(--royal); color: #fff; border-color: var(--royal); }
.btn-fill:hover { background: var(--ink); border-color: var(--ink); color: #fff; }
.btn-line { background: transparent; color: var(--ink); border-color: var(--ink); }
.btn-line:hover { background: var(--ink); color: #fff; }

.tag {
  display: inline-block; font-size: 12px; font-weight: 700;
  color: #fff; background: var(--royal); padding: 2px 10px;
}
.tag-row { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-top: 12px; }
.tag-row li {
  font-size: 13px; font-weight: 700; color: var(--cyan);
  border-bottom: 1px solid currentColor; padding-bottom: 1px;
}

.section { padding-block: clamp(56px, 8vw, 104px); }
.section-gray { background: var(--surface); }

/* 幽灵字 + 前景标题:底部平齐,大字从同一底线向上放大 */
.sec-head {
  position: relative;
  display: inline-flex;          /* 共同定义一个基线盒 */
  align-items: flex-end;         /* 底部对齐 */
  padding-bottom: 0.16em;        /* 防止描边下缘被裁 */
  margin-bottom: 18px;
}
.section .container > .sec-head:first-child { margin-top: 0; }

/* 前景小标题:黑体,与背景衬线大字形成字体对比 */
.sec-title {
  position: relative;
  z-index: 2;
  font-size: clamp(20px, 2vw, 27px);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: 0.015em;
  color: var(--ink);
  /* 白色光晕把标题从背景大字上"挖"出来 */
  text-shadow: 0 0 5px var(--paper), 0 0 9px var(--paper), 0 0 13px var(--paper);
}
.section-gray .sec-title {
  text-shadow: 0 0 5px var(--surface), 0 0 9px var(--surface), 0 0 13px var(--surface);
}

/* 背景衬线大字:与标题同一底线,向上放大 */
.ghost-word {
  position: absolute;
  left: -0.02em;
  bottom: calc(0.16em - 15px);  /* 抵消行高的字形下沉,让笔画底缘真正贴齐标题 */
  z-index: 0;
  font-family: var(--serif);
  font-size: clamp(58px, 8.6vw, 110px);
  font-weight: 400;
  font-style: italic;
  line-height: 0.8;             /* 让大字下缘贴住底线 */
  letter-spacing: -0.025em;
  white-space: nowrap;
  color: rgba(27, 79, 196, 0.05);
  -webkit-text-stroke: 1.2px rgba(27, 79, 196, 0.3);
  pointer-events: none;
  user-select: none;
}
.section-gray .ghost-word { -webkit-text-stroke-color: rgba(27, 79, 196, 0.26); }
@supports (-webkit-text-stroke: 1px #000) {
  .ghost-word { color: transparent; }
  .section-gray .ghost-word { color: transparent; }
}

/* 内容层压在幽灵字之上 */
.sec-title,
.sec-desc,
.sec-head-row,
.join-big-wrap,
.research-list,
.about-grid,
.grant-list,
.pi-card,
.team-filter,
.team-grid,
.news-list,
.join-steps,
.join-panel,
.contact-grid,
.map-placeholder,
.car-track { position: relative; z-index: 1; }

/* ==========================================================================
   顶部导航(白底 hairline)
   ========================================================================== */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: var(--paper);
  border-bottom: 1px solid var(--line-dark);
}
.nav-wrap {
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px; height: 74px;
}
.brand { display: flex; flex-direction: column; line-height: 1.2; flex: none; }
.brand strong {
  font-size: 19px; font-weight: 900; color: var(--royal);
  letter-spacing: -0.01em; white-space: nowrap;
}
.brand small { font-size: 11px; color: var(--muted); letter-spacing: 0.06em; }

.site-nav ul { display: flex; gap: 4px; }
.site-nav a {
  position: relative; display: block; padding: 9px 13px;
  font-size: 15px; color: var(--ink);
  transition: color 0.15s ease-out, background-color 0.15s ease-out;
}
.site-nav a:hover { color: var(--royal); }
.site-nav a.active { color: var(--royal); font-weight: 700; }
.site-nav a.active::after {
  content: ""; position: absolute; left: 13px; right: 13px; bottom: 3px;
  height: 3px; background: var(--royal);
}

.nav-actions { display: flex; align-items: center; gap: 10px; flex: none; }
.lang-toggle {
  padding: 7px 13px; font-size: 13px; font-weight: 700;
  color: var(--ink); background: var(--paper);
  border: 1px solid var(--ink); border-radius: 0;
  transition: background-color 0.15s ease-out, color 0.15s ease-out;
}
.lang-toggle:hover { background: var(--ink); color: #fff; }

.nav-toggle {
  display: none; flex-direction: column; justify-content: center; gap: 5px;
  width: 42px; height: 42px; padding: 9px;
  background: none; border: 1px solid var(--ink); border-radius: 0;
}
.nav-toggle span { display: block; height: 2px; background: var(--ink); transition: transform 0.15s ease-out, opacity 0.15s ease-out; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ==========================================================================
   Hero —— 全部水平居中,尺寸随视口自适应
   ========================================================================== */
.hero {
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;      /* 垂直居中 */
  justify-content: center;
  min-height: calc(100vh - 74px);
  min-height: calc(100svh - 74px);
  padding: 24px 0 34px;     /* 上少下多,抵消数据条自身的下边距 */
}

.hero-inner {
  position: relative;
  width: min(1560px, 100% - 64px);
  margin: 0 auto;
  text-align: center;       /* 一切居中 */
}

/* 装饰插图:右上角背景层,不参与布局 */
.hero-fig {
  position: absolute;
  right: 0; top: 50%;
  transform: translateY(-50%);
  width: clamp(220px, min(23vw, 38vh), 400px);
  height: auto;
  z-index: 0;
  opacity: 0.95;
  pointer-events: none;
}
.hero-aside { margin: 0; }
.hero-top { position: relative; }

/* 主标题四行,居中堆叠 */
.display {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
}
.d-line {
  display: block;
  color: var(--royal);
  line-height: 1;
  letter-spacing: -0.02em;
  white-space: nowrap;
  text-shadow: 0 0 10px #fff, 0 0 20px #fff, 0 0 30px #fff;
}
.l1 { font-size: clamp(42px, min(9vw, 13.5vh), 128px); font-weight: 900; }
.l2 { font-family: var(--serif); font-size: clamp(36px, min(8.2vw, 12.2vh), 116px); font-weight: 400; }
.l3 { font-size: clamp(26px, min(5.6vw, 7vh), 74px);  font-weight: 900; }
.l4 { font-family: var(--serif); font-style: italic; font-size: clamp(22px, min(5vw, 6.2vh), 70px); font-weight: 400; }

/* 副标题 + 按钮:居中一行,不撑高 */
.hero-foot {
  position: relative;
  z-index: 2;
  margin: clamp(16px, 2.6vh, 34px) auto 0;
  max-width: 780px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(12px, 1.8vh, 22px);
}
.hero-sub {
  font-size: clamp(15px, 1.05vw, 18px);
  line-height: 1.75;
  max-width: 34em;
  color: var(--text, #333);
}
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; justify-content: center; }

/* 数据条:居中,等宽三等分 */
.hero-stats {
  position: relative;
  z-index: 2;
  display: flex;
  width: min(720px, 100%);
  margin: clamp(16px, 2.6vh, 34px) auto 0;
  border-top: 1px solid var(--line-dark);
}
.hero-stats li {
  flex: 1 1 0;
  padding: clamp(12px, 1.8vh, 20px) 16px 0;
  text-align: center;
}
.hero-stats li + li { border-left: 1px solid var(--line-dark); }
.stat-num { display: block; font-size: clamp(28px, 2.3vw, 42px); font-weight: 900; color: var(--ink); line-height: 1.1; }
.stat-num em { font-style: normal; color: var(--cyan); }
.stat-label { font-size: clamp(12px, 0.85vw, 14px); color: var(--muted); }

/* ==========================================================================
   简介
   ========================================================================== */
.about-grid {
  display: grid; grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(32px, 5vw, 72px); margin-top: 40px; align-items: start;
}
.about-text p + p { margin-top: 14px; }
.about-text > p { max-width: 36em; }

.value-list { margin-top: 28px; border-top: 1px solid var(--line-dark); }
.value-list li {
  display: grid; grid-template-columns: 140px 1fr; gap: 16px;
  padding: 14px 0; border-bottom: 1px solid var(--line);
}
.value-list b { font-weight: 900; color: var(--ink); }
.value-list span { color: var(--muted); font-size: 15.5px; }

.stat-row {
  display: flex; border-top: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
}
.stat-row li { flex: 1; padding: 18px 16px 18px 0; }
.stat-row li + li { border-left: 1px solid var(--line); padding-left: 16px; }
.about-side .stat-num { font-size: 44px; }

.about-figure {
  border: 1px solid var(--line-dark);
  border-radius: 0;
  background: var(--surface);
  padding: 16px;
}
.about-figure img { width: 100%; }
.about-figure figcaption {
  margin-top: 10px; font-size: 13px; color: var(--muted); text-align: center;
}

.about-card {
  margin-top: 24px; border: 1px solid var(--line-dark);
  padding: 4px 22px;
}
.about-card-row {
  display: grid; grid-template-columns: 96px 1fr; gap: 16px;
  padding: 14px 0; border-bottom: 1px solid var(--line);
  font-size: 15px; align-items: baseline;
}
.about-card-row:last-child { border-bottom: none; }
.about-card-row b { font-weight: 900; }
.about-card-row span { color: var(--muted); }

/* ==========================================================================
   词云
   ========================================================================== */
.kw-band { border-top: 1px solid var(--line-dark); border-bottom: 1px solid var(--line-dark); padding-block: 44px; }
.cloud {
  display: flex; flex-wrap: wrap; align-items: baseline;
  column-gap: 26px; row-gap: 6px; line-height: 1.35;
}
.cloud span { transition: color 0.15s ease-out; cursor: default; }
.cloud span:hover { color: var(--cyan); }
.c-xl { font-size: 46px; font-weight: 900; color: var(--royal); letter-spacing: -0.02em; }
.c-l  { font-size: 34px; font-weight: 900; color: var(--ink); }
.c-m  { font-size: 24px; font-weight: 700; color: var(--royal); }
.c-s  { font-size: 18px; font-weight: 400; color: var(--muted); }
.c-xs { font-size: 15px; font-weight: 400; color: #8A8A8A; }

/* ==========================================================================
   研究方向(行式)
   ========================================================================== */
.research-list { margin-top: 40px; border-top: 1px solid var(--line-dark); }
.research-row {
  display: grid; grid-template-columns: 80px 1fr; gap: 24px;
  padding: 30px 0; border-bottom: 1px solid var(--line-dark);
  transition: background-color 0.15s ease-out;
}
.research-row:hover { background: var(--surface); }
.r-index { font-size: 16px; font-weight: 700; color: var(--cyan); padding-top: 8px; }
.research-row h3 { font-size: clamp(22px, 2.8vw, 31px); font-weight: 900; }
.research-row:hover h3 { color: var(--royal); }
.research-row p { margin-top: 10px; max-width: 42em; color: var(--muted); font-size: 16.5px; }

/* ==========================================================================
   成果轮播
   ========================================================================== */
/* 轮播容器:按钮悬浮在两侧 */
.car-wrap { position: relative; margin-top: 36px; }

.car-btn {
  position: absolute; top: 50%; transform: translateY(-50%);
  z-index: 5;
  display: grid; place-items: center;
  width: 52px; height: 52px;
  background: rgba(255, 255, 255, 0.94);
  color: var(--ink);
  border: 1px solid var(--line-dark);
  border-radius: 50%;
  box-shadow: 0 4px 16px rgba(12, 59, 94, 0.14);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  transition: background-color 0.15s ease-out, color 0.15s ease-out,
              border-color 0.15s ease-out, transform 0.15s ease-out;
}
.car-btn--prev { left: -26px; }
.car-btn--next { right: -26px; }
.car-btn:hover {
  background: var(--royal); color: #fff; border-color: var(--royal);
}
.car-btn--prev:hover { transform: translateY(-50%) translateX(-2px); }
.car-btn--next:hover { transform: translateY(-50%) translateX(2px); }
.car-btn:focus-visible { outline: 2px solid var(--royal); outline-offset: 3px; }
.car-btn:disabled { opacity: .35; pointer-events: none; }
.car-btn svg { width: 22px; height: 22px; }

/* 中等屏幕:按钮压在卡片边缘内侧(不再外扩到容器外) */
@media (max-width: 1420px) {
  .car-btn--prev { left: 10px; }
  .car-btn--next { right: 10px; }
  .car-btn { width: 46px; height: 46px; }
}
@media (max-width: 640px) {
  .car-btn { width: 40px; height: 40px; }
  .car-btn--prev { left: 6px; }
  .car-btn--next { right: 6px; }
}

.car-track {
  display: flex; gap: 24px; margin-top: 0;
  overflow-x: auto;
  scrollbar-width: none; -webkit-overflow-scrolling: touch;
  padding-bottom: 6px;
}
.car-track::-webkit-scrollbar { display: none; }
.slide {
  flex: 0 0 min(560px, 78vw);
  border: 1px solid var(--line-dark);
  background: var(--paper);
  padding: 18px 18px 22px;
  display: flex; flex-direction: column;
}
.slide-fig {
  aspect-ratio: 16 / 9; overflow: hidden;
  border: 1px solid var(--line);
  margin-bottom: 14px; background: var(--surface);
}
.slide-fig img { width: 100%; height: 100%; object-fit: cover; object-position: center top; }  /* 铺满图框,顶部优先 */
.slide-type .cover {
  aspect-ratio: 16 / 9; margin-bottom: 14px;
  display: grid; place-items: center; padding: 24px;
}
.cover-royal { background: var(--royal); }
.cover-black { background: var(--ink); }
.cover span {
  color: #fff; font-weight: 900; font-size: clamp(30px, 3.4vw, 46px);
  line-height: 1.02; letter-spacing: -0.02em; text-align: left;
}
.slide-meta {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; margin-bottom: 10px;
}
.slide-year { font-size: 20px; font-weight: 900; color: var(--cyan); }
.slide h3 { font-size: 18px; line-height: 1.55; font-weight: 700; }

/* 论文标题链接 */
.pub-link { color: inherit; text-decoration: none; transition: color 0.15s ease-out; }
.pub-link .ext {
  display: inline-block;
  font-size: 0.8em; font-weight: 400; margin-left: 4px;
  color: var(--cyan);
  transition: transform 0.15s ease-out;
}
.pub-link:hover { color: var(--royal); text-decoration: underline; text-underline-offset: 3px; }
.pub-link:hover .ext { transform: translate(2px, -2px); }
.pub-link:focus-visible { outline: 2px solid var(--royal); outline-offset: 3px; }

.news-item h3 .pub-link { display: inline; }
.slide-journal { margin-top: 8px; font-size: 13.5px; color: var(--muted); letter-spacing: 0.05em; }

/* ==========================================================================
   在研项目
   ========================================================================== */
.grant-list { margin-top: 36px; border-top: 1px solid var(--line-dark); }
.grant-list li {
  display: grid; grid-template-columns: 110px 1fr auto; gap: 20px;
  align-items: center; padding: 18px 0;
  border-bottom: 1px solid var(--line);
}
.grant-list h3 { font-size: 19px; font-weight: 900; }
.g-meta { font-size: 14px; color: var(--muted); white-space: nowrap; }
.pub-note { margin-top: 22px; font-size: 13.5px; color: var(--muted); }
.pub-note a { color: var(--royal); border-bottom: 1px solid currentColor; }
.pub-note a:hover { color: var(--cyan); }

/* ==========================================================================
   团队
   ========================================================================== */
.pi-card {
  display: grid; grid-template-columns: 96px 1fr; gap: 22px;
  margin-top: 40px; padding-bottom: 30px;
  border-bottom: 1px solid var(--line-dark);
}
.pi-avatar { width: 96px; height: 96px; border: 1px solid var(--line-dark); }
.pi-card h3 { font-size: 22px; font-weight: 900; }
.pi-badge {
  display: inline-block; font-size: 11px; font-weight: 700;
  letter-spacing: 0.1em; color: #fff; background: var(--royal);
  padding: 2px 8px; vertical-align: 4px;
}
.pi-role { font-size: 14px; font-weight: 400; color: var(--muted); margin-left: 6px; }
.pi-bio { margin-top: 10px; font-size: 16px; max-width: 46em; color: var(--text, #333); }

.team-filter { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 30px; }
.chip {
  padding: 8px 18px; font-size: 13.5px; color: var(--ink);
  background: var(--paper); border: 1px solid var(--ink); border-radius: 0;
  transition: background-color 0.15s ease-out, color 0.15s ease-out;
}
.chip:hover { background: var(--surface); }
.chip.is-active { background: var(--ink); color: #fff; }

.team-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 0; margin-top: 26px; border-top: 1px solid var(--line); border-left: 1px solid var(--line);
}
.member-card {
  padding: 24px 16px; text-align: center;
  border-right: 1px solid var(--line); border-bottom: 1px solid var(--line);
  background: var(--paper);
  transition: background-color 0.15s ease-out;
}
.member-card:hover { background: var(--surface); }
.member-card img { width: 68px; height: 68px; margin-inline: auto; border: 1px solid var(--line); }
.member-card h3 { margin-top: 12px; font-size: 15px; font-weight: 700; }
.member-role { margin-top: 2px; font-size: 12.5px; font-weight: 700; color: var(--cyan); }
.member-topic { margin-top: 4px; font-size: 12.5px; color: var(--muted); }
.member-card.hide { display: none; }

/* ==========================================================================
   新闻
   ========================================================================== */
.news-list { margin-top: 36px; border-top: 1px solid var(--line-dark); }
.news-item {
  display: grid; grid-template-columns: 110px 1fr; gap: 24px;
  padding: 22px 0; border-bottom: 1px solid var(--line-dark);
}
.news-date {
  font-size: 14px; font-weight: 700; color: var(--royal); padding-top: 3px;
}
.news-tag { font-size: 12px; font-weight: 700; letter-spacing: 0.08em; color: var(--cyan); }
.news-item h3 { margin-top: 5px; font-size: 19px; font-weight: 900; line-height: 1.5; }
.news-item:hover h3 { color: var(--royal); }
.news-excerpt { margin-top: 6px; font-size: 15.5px; color: var(--muted); max-width: 46em; }

/* ==========================================================================
   加入我们
   ========================================================================== */
/* 加入我们:大号蓝字 CTA(无背景幽灵字) */
.join-big {
  display: inline-flex; align-items: center; gap: 20px;
  margin-top: 8px; color: var(--royal);
}
.jb-sans {
  font-size: clamp(44px, 7vw, 96px); font-weight: 900; line-height: 1;
  letter-spacing: -0.02em;
}
.jb-arr { font-size: clamp(40px, 6vw, 84px); line-height: 1; transition: transform 0.15s ease-out; }
.join-big:hover { color: var(--ink); }
.join-big:hover .jb-arr { transform: translateX(8px); }

.join-steps {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px;
  margin-top: 44px; padding-top: 34px; border-top: 1px solid var(--line-dark);
}
.js-num { font-size: 15px; font-weight: 700; color: var(--cyan); }
.join-steps h3 { margin-top: 8px; font-size: 18px; font-weight: 900; }
.join-steps p { margin-top: 6px; font-size: 15.5px; color: var(--muted); }

.join-panel {
  margin-top: 40px; padding: 28px; border: 1px solid var(--line-dark);
  display: grid; grid-template-columns: 1fr auto; gap: 24px; align-items: center;
}
.join-panel p { font-size: 15px; max-width: 44em; }
.join-note { grid-column: 1 / -1; font-size: 13px; color: var(--muted); border-top: 1px solid var(--line); padding-top: 14px; }

/* 招生:要求 + 申请方式 两块 */
.join-block {
  margin-top: 36px;
  padding-top: 26px;
  border-top: 1px solid var(--line-dark);
}
.join-block-title {
  font-size: 16px;
  font-weight: 900;
  letter-spacing: 0.06em;
  color: var(--ink);
  margin-bottom: 18px;
}
.join-reqs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 40px;
}
.join-reqs li {
  display: grid;
  grid-template-columns: 32px 1fr;
  gap: 12px;
  align-items: start;
}
.join-reqs .js-num { padding-top: 2px; }
.join-reqs p { font-size: 15.5px; color: var(--text, #333); line-height: 1.75; }

.join-apply-lead {
  font-size: 16px;
  margin-bottom: 16px;
  max-width: 46em;
}
.join-apply-lead a { color: var(--royal); border-bottom: 1px solid currentColor; font-weight: 700; }
.join-apply-lead a:hover { color: var(--cyan); }

.join-apply-list {
  display: grid;
  gap: 0;
  max-width: 720px;
  border-top: 1px solid var(--line);
}
.join-apply-list li {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 20px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  font-size: 15.5px;
}
.join-apply-list b { font-weight: 900; color: var(--ink); }
.join-apply-list span { color: var(--muted); }

@media (max-width: 760px) {
  .join-reqs { grid-template-columns: 1fr; gap: 16px; }
  .join-apply-list li { grid-template-columns: 1fr; gap: 4px; }
}

/* ==========================================================================
   联系方式
   ========================================================================== */
.contact-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  border-top: 1px solid var(--line-dark); border-left: 1px solid var(--line-dark);
  margin-top: 40px;
}
.contact-cell {
  padding: 26px 24px; border-right: 1px solid var(--line-dark); border-bottom: 1px solid var(--line-dark);
  background: var(--paper);
}
.contact-cell h3 { font-size: 14px; font-weight: 700; letter-spacing: 0.08em; color: var(--cyan); }
.contact-cell p { margin-top: 12px; font-size: 16px; }
.contact-cell a { color: var(--royal); border-bottom: 1px solid currentColor; }
.contact-cell a:hover { color: var(--cyan); }
.contact-sub { margin-top: 8px; font-size: 13.5px; color: var(--muted); }
.qr-box {
  width: 88px; height: 88px; margin-top: 12px;
  display: grid; place-items: center;
  border: 1px dashed #B9B9B9; background: var(--surface); color: var(--muted);
}
.qr-box svg { width: 40px; height: 40px; }

/* 真实地图 */
.map-figure { margin-top: 28px; }
.map-figure a { display: block; }
.map-figure img {
  width: 100%; display: block;
  border: 1px solid var(--line-dark);
}
.map-figure figcaption {
  margin-top: 8px; font-size: 12.5px; color: var(--muted);
}
.map-figure figcaption a { color: var(--royal); }

/* ==========================================================================
   页脚(黑底)
   ========================================================================== */
.site-footer { background: var(--ink); color: rgba(255, 255, 255, 0.85); }
.footer-grid {
  display: grid; grid-template-columns: 1.2fr 0.9fr 0.9fr;
  gap: 44px; padding-block: 52px 40px;
}
.footer-name { font-size: 22px; font-weight: 900; color: #fff; }
.footer-desc { margin-top: 10px; font-size: 14px; color: rgba(255,255,255,0.6); max-width: 30em; }
.site-footer .ph, .site-footer .ph-inline { color: rgba(255,255,255,0.6); border-bottom-color: rgba(255,255,255,0.35); }
.footer-nav h3, .footer-links h3 {
  font-size: 12px; font-weight: 700; letter-spacing: 0.2em;
  color: rgba(255,255,255,0.5); margin-bottom: 14px;
}
.footer-nav li, .footer-links li { margin-top: 9px; }
.footer-nav a, .footer-links a { font-size: 14px; color: rgba(255,255,255,0.85); }
.footer-nav a:hover, .footer-links a:hover { color: #fff; text-decoration: underline; }
.footer-bottom {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px;
  padding-block: 18px; border-top: 1px solid rgba(255,255,255,0.2);
  font-size: 12.5px; color: rgba(255,255,255,0.55);
}

.back-top {
  position: fixed; right: 20px; bottom: 24px; z-index: 90;
  display: grid; place-items: center; width: 44px; height: 44px;
  background: var(--ink); color: #fff; border: none; border-radius: 0;
  transition: background-color 0.15s ease-out;
}
.back-top:hover { background: var(--royal); }
.back-top svg { width: 20px; height: 20px; }
.back-top[hidden] { display: none; }

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 1060px) {
  .hero-fig { display: none; }
}

@media (max-width: 920px) {
  .nav-toggle { display: flex; }
  .site-nav {
    position: absolute; top: 74px; left: 0; right: 0; display: none;
    background: var(--paper); border-bottom: 1px solid var(--line-dark);
  }
  .site-nav.open { display: block; }
  .site-nav ul { flex-direction: column; gap: 0; padding: 10px 24px 16px; }
  .site-nav a { padding: 11px 4px; }
  .site-nav a.active::after { display: none; }
}

@media (max-width: 860px) {
  .about-grid, .join-panel { grid-template-columns: 1fr; }
  .join-steps { grid-template-columns: 1fr; gap: 24px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
  .grant-list li { grid-template-columns: 90px 1fr; }
  .g-meta { grid-column: 2; }
}

@media (max-width: 560px) {
  .container { width: min(1200px, 100% - 40px); }
  .d-line { white-space: normal; }
  .value-list li { grid-template-columns: 1fr; gap: 4px; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .news-item { grid-template-columns: 1fr; gap: 6px; }
  .news-date { padding-top: 0; }
  .pi-card { grid-template-columns: 72px 1fr; gap: 16px; }
  .pi-avatar { width: 72px; height: 72px; }
  .hero-stats li { padding-block: 14px; }
  .join-panel { padding: 20px; }
  .slide { flex-basis: 86vw; }
}

/* 减弱动效 */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-delay: 0s !important;
    transition-duration: 0.01ms !important;
  }
}