/* =========================================================
   个人作品集 · 技术向善
   设计系统 + 三套主题（亮 / 暗 / 高对比）
   ========================================================= */

/* ---------- 主题变量：亮色（默认） ---------- */
:root {
  --bg: #f7f9fb;
  --bg-elev: #ffffff;
  --bg-soft: #eef2f6;
  --text: #0f172a;
  --text-soft: #475569;
  --text-mute: #64748b;
  --primary: #0f766e;       /* 向善 / 公益 青绿 */
  --primary-strong: #0b5d56;
  --accent: #f59e0b;        /* 温暖点缀 */
  --border: #e2e8f0;
  --shadow: 0 10px 30px -12px rgba(15, 23, 42, 0.18);
  --shadow-sm: 0 2px 8px -2px rgba(15, 23, 42, 0.12);
  --radius: 10px;
  --radius-sm: 7px;
  --maxw: 1120px;
  --font: "Inter", "Noto Sans SC", system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  /* 标题走衬线：Newsreader（英）+ 思源宋体（中），与学术气质同源 */
  --font-display: "Newsreader", "Noto Serif SC", Georgia, "Times New Roman", "Songti SC", "SimSun", serif;
  --grad: linear-gradient(120deg, #0f766e, #14b8a6 45%, #0d9488);
}

/* ---------- 暗色主题 ---------- */
[data-theme="dark"] {
  --bg: #0b1120;
  --bg-elev: #131c2e;
  --bg-soft: #1b2638;
  --text: #e6edf6;
  --text-soft: #b4c0d0;
  --text-mute: #8493a8;
  --primary: #2dd4bf;
  --primary-strong: #14b8a6;
  --accent: #fbbf24;
  --border: #25324a;
  --shadow: 0 14px 40px -16px rgba(0, 0, 0, 0.6);
  --shadow-sm: 0 2px 10px -2px rgba(0, 0, 0, 0.5);
}

/* ---------- 高对比度主题（呼应无障碍主题） ---------- */
[data-theme="contrast"] {
  --bg: #000000;
  --bg-elev: #000000;
  --bg-soft: #0a0a0a;
  --text: #ffffff;
  --text-soft: #ffffff;
  --text-mute: #ffe600;
  --primary: #ffe600;
  --primary-strong: #ffe600;
  --accent: #00e5ff;
  --border: #ffffff;
  --shadow: 0 0 0 2px #ffffff;
  --shadow-sm: 0 0 0 2px #ffffff;
  --grad: none;
}

/* ---------- 基础重置 ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation: none !important; transition: none !important; }
}
body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background .3s ease, color .3s ease;
}
h1, h2, h3, h4 { line-height: 1.25; margin: 0 0 .5em; font-weight: 800; font-family: var(--font-display); }
p { margin: 0 0 1em; }
a { color: var(--primary); text-decoration: none; }
img, svg { max-width: 100%; display: block; }
ul, ol { margin: 0; padding: 0; list-style: none; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }

/* ---------- 无障碍：跳过链接 + 焦点样式 ---------- */
.skip-link {
  position: absolute; left: 12px; top: -60px; z-index: 200;
  background: var(--primary); color: #fff; padding: 10px 16px; border-radius: 8px;
  transition: top .2s;
}
.skip-link:focus { top: 12px; }

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}
[data-theme="contrast"] :focus-visible { outline: 3px solid #00e5ff; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: color-mix(in srgb, var(--bg-elev) 86%, transparent);
  backdrop-filter: saturate(140%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 66px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 800; }
.brand-mark {
  width: 34px; height: 34px; border-radius: 7px; display: grid; place-items: center;
  background: var(--grad, var(--primary)); color: #fff; font-weight: 900;
}
.brand-text { font-size: .96rem; display: flex; flex-direction: column; line-height: 1.05; white-space: nowrap; }
.brand-text small { font-size: .62rem; font-weight: 500; color: var(--text-mute); letter-spacing: .12em; }

.nav-links { display: flex; gap: 6px; }
.nav-link {
  color: var(--text-soft); font-weight: 600; font-size: .94rem;
  padding: 8px 13px; border-radius: 7px; transition: background .2s, color .2s;
}
.nav-link:hover { color: var(--text); background: var(--bg-soft); }
.nav-link.is-current { color: var(--primary); background: color-mix(in srgb, var(--primary) 12%, transparent); }

.nav-actions { display: flex; align-items: center; gap: 8px; }
.theme-toggle, .menu-toggle {
  width: 40px; height: 40px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--bg-elev); color: var(--text); cursor: pointer; font-size: 1.1rem;
  display: grid; place-items: center; transition: background .2s, transform .2s;
}
.theme-toggle:hover, .menu-toggle:hover { background: var(--bg-soft); transform: translateY(-1px); }
.menu-toggle { display: none; flex-direction: column; gap: 4px; }
.menu-toggle span { width: 18px; height: 2px; background: var(--text); border-radius: 2px; transition: .25s; }
.menu-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.lang-toggle {
  height: 40px; padding: 0 12px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--bg-elev); color: var(--text); cursor: pointer;
  font-size: .85rem; font-weight: 800; letter-spacing: .04em;
  display: grid; place-items: center; transition: background .2s, transform .2s;
}
.lang-toggle:hover { background: var(--bg-soft); transform: translateY(-1px); }

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; padding: 92px 0 72px; }
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background:
    radial-gradient(60% 60% at 80% 0%, color-mix(in srgb, var(--primary) 16%, transparent), transparent 70%),
    radial-gradient(50% 50% at 0% 100%, color-mix(in srgb, var(--accent) 12%, transparent), transparent 70%);
}
/* 细网格纹理：呼应路径规划，替代空洞的纯渐变 */
.hero-bg::after {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(to right, color-mix(in srgb, var(--text) 6%, transparent) 1px, transparent 1px),
    linear-gradient(to bottom, color-mix(in srgb, var(--text) 6%, transparent) 1px, transparent 1px);
  background-size: 58px 58px;
  -webkit-mask-image: radial-gradient(75% 70% at 50% 28%, #000, transparent 78%);
  mask-image: radial-gradient(75% 70% at 50% 28%, #000, transparent 78%);
}
[data-theme="contrast"] .hero-bg::after { display: none; }
.hero-inner { position: relative; z-index: 1; max-width: var(--maxw); }
.hero-copy { max-width: 100%; }
.eyebrow {
  display: inline-block; font-weight: 700; letter-spacing: .14em; text-transform: uppercase;
  font-size: .8rem; color: var(--primary); margin-bottom: 14px;
}
.hero-title { font-size: clamp(2.15rem, 5.2vw, 4rem); line-height: 1.3; letter-spacing: -.012em; }
.hero-motto {
  margin: -6px auto 18px; width: fit-content;
  font-family: var(--font-display);
  font-size: clamp(.92rem, 1.4vw, 1.12rem); font-weight: 500;
  letter-spacing: .08em; color: var(--text-mute);
}
[data-theme="dark"] .hero-motto { color: #9fb3c8; }
.grad {
  display: inline-block;
  background: var(--grad, var(--primary)); -webkit-background-clip: text; background-clip: text; color: transparent;
}
/* 英文标题允许自然换行，避免 "with code" 被 inline-block 整体甩到下一行成孤行 */
html[data-lang="en"] .grad { display: inline; }
.hero-lead { font-size: clamp(1.02rem, 2.2vw, 1.22rem); color: var(--text-soft); max-width: none; }
.hero-lead strong { color: var(--text); }

.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; margin: 26px 0 36px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 13px 24px; border-radius: 10px;
  font-weight: 700; font-size: .98rem; cursor: pointer; border: 1px solid transparent;
  transition: transform .18s ease, box-shadow .2s ease, background .2s;
}
.btn-primary { background: var(--primary); color: #fff; box-shadow: var(--shadow-sm); }
.btn-primary:hover { background: var(--primary-strong); transform: translateY(-2px); }
.btn-ghost { background: transparent; color: var(--text); border-color: var(--border); }
.btn-ghost:hover { background: var(--bg-soft); transform: translateY(-2px); }

.hero-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; max-width: none; }
.hero-stats li {
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 14px 10px; text-align: center; box-shadow: var(--shadow-sm);
}
.stat-num { display: block; font-size: 1.7rem; font-weight: 900; color: var(--primary); }
.stat-label { font-size: .74rem; color: var(--text-mute); }

/* ---------- 招生官指南 ---------- */
.guide { padding: 18px 0 26px; }
.guide-card {
  display: flex; gap: 20px; align-items: flex-start;
  background: linear-gradient(135deg, color-mix(in srgb, var(--primary) 10%, var(--bg-elev)), var(--bg-elev));
  border: 1px solid var(--border); border-left: 5px solid var(--primary);
  border-radius: var(--radius); padding: 26px 28px; box-shadow: var(--shadow);
}
.guide-badge { font-size: 2rem; line-height: 1; }
.guide-title { margin: 0 0 4px; font-size: 1.4rem; }
.guide-sub { color: var(--text-soft); margin-bottom: 14px; }
.guide-list { display: grid; gap: 12px; }
.guide-list li { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; color: var(--text-soft); }
.guide-tag {
  font-size: .74rem; font-weight: 700; padding: 4px 10px; border-radius: 999px; white-space: nowrap;
}
.tag-algo { background: color-mix(in srgb, #2563eb 16%, transparent); color: #2563eb; }
.tag-ethic { background: color-mix(in srgb, #9333ea 16%, transparent); color: #9333ea; }
.tag-lead { background: color-mix(in srgb, var(--accent) 22%, transparent); color: #b45309; }
.tag-art { background: color-mix(in srgb, #db2777 16%, transparent); color: #db2777; }
[data-theme="contrast"] .tag-algo,
[data-theme="contrast"] .tag-ethic,
[data-theme="contrast"] .tag-lead,
[data-theme="contrast"] .tag-art { color: #000; background: #ffe600; }
.guide-note { margin: 14px 0 0; font-weight: 600; color: var(--text); }

/* ---------- 通用区块标题 ---------- */
.section-head { text-align: center; max-width: 680px; margin: 0 auto 44px; }
.section-head.left { text-align: left; margin: 0 0 22px; }
.section-eyebrow { letter-spacing: .2em; font-size: .78rem; font-weight: 700; color: var(--primary); margin: 0 0 6px; }
.section-title { font-size: clamp(1.8rem, 4vw, 2.6rem); }
.section-desc { color: var(--text-soft); }

/* ---------- 锚点定位与区块间距 ---------- */
/* 顶部导航吸顶 66px，锚点跳转时留出余量，避免标题被遮挡 */
section[id] { scroll-margin-top: 78px; }
/* honors / experience / welfare 此前没有任何纵向 padding，三块是贴死的 */
.honors, .experience, .welfare { padding: 70px 0; }

/* ---------- 基本信息（#profile） ---------- */
.profile { padding: 70px 0; }
.profile-grid {
  margin: 0; display: grid; gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}
.profile-item {
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: 10px;
  padding: 15px 18px; box-shadow: var(--shadow-sm);
}
.profile-item dt {
  margin: 0 0 5px; font-size: .74rem; font-weight: 700;
  letter-spacing: .06em; text-transform: uppercase; color: var(--text-mute);
}
.profile-item dd { margin: 0; font-size: .95rem; font-weight: 600; line-height: 1.45; overflow-wrap: anywhere; }
[data-theme="contrast"] .profile-item dt { color: #ffe600; }

/* ---------- 一条主线（#thread · ACDA） ---------- */
.thread { padding: 70px 0; }
.thread-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(420px, 1fr)); gap: 16px;
}
.thread-card {
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px 22px; box-shadow: var(--shadow-sm);
  transition: transform .2s ease, box-shadow .2s ease;
}
.thread-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.thread-word {
  margin: 0; font-family: var(--font-display); font-size: 1.55rem; font-weight: 700;
  line-height: 1.1; letter-spacing: .01em; color: var(--primary);
}
.thread-cn {
  margin: 4px 0 14px; font-size: .78rem; font-weight: 700;
  letter-spacing: .16em; color: var(--text-mute);
}
.thread-body {
  margin: 0 0 10px; padding-bottom: 12px; font-size: .88rem; color: var(--text);
  border-bottom: 1px solid var(--border);
}
.thread-detail { margin: 0; font-size: .86rem; line-height: 1.68; color: var(--text-soft); }
.thread-detail strong { color: var(--text); font-weight: 700; }

/* ---------- 项目状态徽章 ---------- */
.project-badge {
  display: inline-block; margin-bottom: 8px;
  padding: 4px 11px; border-radius: 999px; border: 1px solid transparent;
  font-size: .72rem; font-weight: 800; letter-spacing: .04em;
}
.badge-wip {
  background: color-mix(in srgb, var(--accent) 20%, transparent);
  border-color: color-mix(in srgb, var(--accent) 45%, transparent);
  color: #b45309;
}
[data-theme="dark"] .badge-wip { color: #fbbf24; }
[data-theme="contrast"] .badge-wip { background: #000; border-color: #fff; color: #ffe600; }

/* ---------- 项目展示 ---------- */
.projects { padding: 70px 0; }
.project-list { display: grid; gap: 30px; }

.project-card {
  display: grid; grid-template-columns: 0.85fr 1.15fr; gap: 0;
  background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow);
  transition: transform .25s ease, box-shadow .25s ease;
}
.project-card:hover { transform: translateY(-4px); box-shadow: 0 22px 50px -20px rgba(15,23,42,.28); }

.project-media {
  background: var(--bg-soft);
  padding: 20px; display: flex; align-items: center; justify-content: center;
  border-right: 1px solid var(--border);
}

/* 项目截图（真实截图占位） */
.shot {
  position: relative; width: 100%; margin: 0; aspect-ratio: 16 / 10;
  border-radius: 10px; overflow: hidden; background: var(--bg);
  border: 1px solid var(--border); box-shadow: var(--shadow-sm);
}
.shot-img { width: 100%; height: 100%; object-fit: cover; display: block; }
.shot-empty {
  position: absolute; inset: 0; display: none; flex-direction: column;
  align-items: center; justify-content: center; gap: 6px; text-align: center;
  padding: 16px; color: var(--text-mute);
  background: repeating-linear-gradient(135deg, var(--bg-soft), var(--bg-soft) 14px, var(--bg) 14px, var(--bg) 28px);
}
.shot-empty-ico { font-size: 1.6rem; }
.shot-empty small { font-size: .76rem; line-height: 1.45; }
.shot-empty code { background: var(--bg-elev); padding: 2px 6px; border-radius: 6px; border: 1px solid var(--border); color: var(--text-soft); }
.shot--empty .shot-img { display: none; }
.shot--empty .shot-empty { display: flex; }
.shot--empty .slides { display: none; }

/* 可验证佐证：把第三方证据从 Impact 标签前置到卡片摘要区，不点标签也能看见 */
.project-proof {
  display: flex; align-items: baseline; gap: 10px;
  margin: 14px 0 16px; padding: 10px 13px;
  background: var(--bg-soft); border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: .82rem; line-height: 1.6; color: var(--text-soft);
}
.proof-tag {
  flex-shrink: 0; font-size: .68rem; font-weight: 800;
  letter-spacing: .1em; text-transform: uppercase; color: var(--accent);
}
[data-theme="contrast"] .project-proof { border-left-color: var(--accent); }
[data-theme="contrast"] .proof-tag { color: var(--accent); }

/* 截图轮播 */
.slides { position: absolute; inset: 0; }
.slide {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: contain; display: block; opacity: 0; background: var(--bg);
  transition: opacity .6s ease;
}
.slide.is-active { opacity: 1; }
.shot-nav {
  position: absolute; top: 50%; transform: translateY(-50%);
  width: 34px; height: 34px; border-radius: 50%; border: 0; cursor: pointer;
  background: rgba(15, 23, 42, .55); color: #fff; font-size: 1.4rem; line-height: 1;
  display: grid; place-items: center; opacity: 0;
  transition: opacity .2s, background .2s; z-index: 2;
}
.shot-nav:hover, .shot-nav:focus-visible { background: rgba(15, 23, 42, .85); }
.shot-prev { left: 8px; }
.shot-next { right: 8px; }
.shot:hover .shot-nav, .shot:focus-within .shot-nav { opacity: 1; }
.shot-dots {
  position: absolute; left: 0; right: 0; bottom: 10px; z-index: 2;
  display: flex; gap: 6px; justify-content: center; padding: 0 8px;
}
.shot-dot {
  width: 8px; height: 8px; padding: 0; border: 0; border-radius: 50%;
  background: rgba(255, 255, 255, .55); cursor: pointer;
  transition: background .2s, transform .2s;
}
.shot-dot.is-active { background: #fff; transform: scale(1.3); }
.shot-dot:hover, .shot-dot:focus-visible { background: #fff; }
.shot.is-single .shot-nav, .shot.is-single .shot-dots { display: none; }

/* 轮播图可点击放大 */
.slide { cursor: zoom-in; pointer-events: none; }
.slide.is-active { pointer-events: auto; }
.slide.is-active:focus-visible { outline: 3px solid var(--accent); outline-offset: -3px; }
.slide-zoom-hint {
  position: absolute; top: 8px; right: 8px; z-index: 3;
  background: rgba(15, 23, 42, .7); color: #fff; font-size: .72rem;
  padding: 4px 9px; border-radius: 999px; pointer-events: none;
  opacity: 0; transition: opacity .25s ease;
}
.shot:hover .slide-zoom-hint, .shot:focus-within .slide-zoom-hint { opacity: 1; }

/* ============ 图片灯箱 ============ */
.lightbox {
  position: fixed; inset: 0; z-index: 1000;
  display: flex; align-items: center; justify-content: center; padding: 32px;
}
.lightbox[hidden] { display: none; }
.lightbox-backdrop {
  position: absolute; inset: 0; background: rgba(8, 12, 22, .92);
  -webkit-backdrop-filter: blur(4px); backdrop-filter: blur(4px);
}
.lightbox-stage {
  position: relative; z-index: 1; margin: 0;
  max-width: min(1100px, 92vw); max-height: 86vh;
  display: flex; flex-direction: column; align-items: center; gap: 12px;
}
.lightbox-img {
  max-width: 100%; max-height: 78vh; object-fit: contain;
  border-radius: 10px; box-shadow: 0 20px 60px rgba(0, 0, 0, .55); background: #fff;
}
.lightbox-cap { color: #e2e8f0; font-size: .85rem; text-align: center; }
.lightbox-close, .lightbox-nav {
  position: absolute; z-index: 2; border: none; cursor: pointer;
  background: rgba(255, 255, 255, .12); color: #fff; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  transition: background .2s ease, outline-color .2s ease;
}
.lightbox-close { top: 20px; right: 24px; width: 44px; height: 44px; font-size: 1.8rem; line-height: 1; }
.lightbox-nav { top: 50%; transform: translateY(-50%); width: 52px; height: 52px; font-size: 2rem; line-height: 1; }
.lightbox-prev { left: 18px; }
.lightbox-next { right: 18px; }
.lightbox-close:hover, .lightbox-nav:hover,
.lightbox-close:focus-visible, .lightbox-nav:focus-visible {
  background: rgba(255, 255, 255, .28); outline: 3px solid var(--accent); outline-offset: 2px;
}
.lightbox-dots {
  position: absolute; z-index: 2; bottom: 22px; left: 50%; transform: translateX(-50%);
  display: flex; gap: 8px;
}
.lightbox-dot {
  width: 10px; height: 10px; border-radius: 50%; border: none; cursor: pointer;
  padding: 0; background: rgba(255, 255, 255, .4);
}
.lightbox-dot.is-active { background: #fff; transform: scale(1.3); }
.lightbox-dot:hover, .lightbox-dot:focus-visible { background: #fff; outline: 2px solid var(--accent); outline-offset: 2px; }
@media (max-width: 560px) {
  .lightbox { padding: 12px; }
  .lightbox-nav { width: 42px; height: 42px; font-size: 1.6rem; }
  .lightbox-prev { left: 6px; } .lightbox-next { right: 6px; }
  .lightbox-img { max-height: 70vh; }
  .lightbox-close { top: 12px; right: 12px; }
}

/* 项目卡片底部操作 */
.project-actions { margin-top: auto; padding-top: 18px; display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.btn-project-visit {
  font-family: inherit; cursor: pointer; border: none;
  background: var(--primary); color: #fff; font-weight: 700; font-size: .95rem;
  padding: 11px 20px; border-radius: 11px; box-shadow: var(--shadow-sm);
  transition: background .2s, transform .18s ease;
}
.btn-project-visit:hover { background: var(--primary-strong); transform: translateY(-2px); }
.project-link-ghost { color: var(--text-soft); font-weight: 600; font-size: .92rem; }
.project-link-ghost:hover { color: var(--primary); text-decoration: underline; }

/* ---------- 弹窗（访问真实项目系统） ---------- */
.modal { position: fixed; inset: 0; z-index: 200; display: flex; align-items: center; justify-content: center; padding: 20px; }
.modal[hidden] { display: none; }
.modal-overlay { position: absolute; inset: 0; background: rgba(8, 15, 30, .55); backdrop-filter: blur(3px); animation: fade .2s ease; }
.modal-dialog {
  position: relative; width: 100%; max-width: 460px; background: var(--bg-elev);
  border: 1px solid var(--border); border-radius: var(--radius); padding: 30px 28px 26px;
  box-shadow: 0 30px 70px -20px rgba(0,0,0,.5); animation: pop .25s ease;
}
@keyframes pop { from { opacity: 0; transform: translateY(14px) scale(.98); } to { opacity: 1; transform: none; } }
.modal-close {
  position: absolute; top: 14px; right: 16px; width: 34px; height: 34px; border-radius: 7px;
  border: 1px solid var(--border); background: var(--bg-soft); color: var(--text); cursor: pointer; font-size: 1.3rem; line-height: 1;
}
.modal-close:hover { background: var(--bg); }
.modal-eyebrow { letter-spacing: .16em; font-size: .72rem; font-weight: 700; color: var(--primary); margin: 0 0 6px; text-transform: uppercase; }
.modal-title { font-size: 1.3rem; margin: 0 0 8px; padding-right: 30px; }
.modal-desc { color: var(--text-soft); font-size: .94rem; margin: 0 0 16px; }
.modal-account {
  display: flex; align-items: center; gap: 10px; padding: 12px 14px; border-radius: 8px;
  background: var(--bg-soft); border: 1px dashed var(--border); margin-bottom: 18px; flex-wrap: wrap;
}
.modal-account-label { font-size: .78rem; font-weight: 700; color: var(--text-mute); }
.modal-account-code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .9rem; color: var(--text); word-break: break-all; }
.modal-visit { width: 100%; justify-content: center; }
.modal-note { font-size: .8rem; color: var(--text-mute); margin: 12px 0 0; text-align: center; }
.modal-note code { background: var(--bg-soft); padding: 1px 5px; border-radius: 5px; }

.project-content { padding: 28px 30px; display: flex; flex-direction: column; }
.project-top { margin-bottom: 16px; }
.project-cat {
  display: inline-block; font-size: .74rem; font-weight: 700; letter-spacing: .04em;
  color: var(--primary); background: color-mix(in srgb, var(--primary) 12%, transparent);
  padding: 4px 11px; border-radius: 999px; margin-bottom: 10px;
}
.project-name { font-size: 1.45rem; margin: 0 0 6px; }
.project-tagline { color: var(--text-soft); margin: 0; font-size: .96rem; }

/* 标签页 */
.tabs { margin-top: 4px; }
.tab-list { display: flex; gap: 4px; border-bottom: 1px solid var(--border); margin-bottom: 16px; flex-wrap: wrap; }
.tab {
  background: none; border: none; cursor: pointer; font-family: inherit;
  color: var(--text-mute); font-weight: 700; font-size: .9rem; padding: 9px 14px;
  border-bottom: 2px solid transparent; transition: color .2s, border-color .2s;
}
.tab:hover { color: var(--text); }
.tab.is-active { color: var(--primary); border-bottom-color: var(--primary); }
.tab-panel { animation: fade .3s ease; }
.tab-panel[hidden] { display: none; }
@keyframes fade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
.tab-panel h4 { font-size: 1rem; color: var(--text); margin: 14px 0 4px; }
.tab-panel h4:first-child { margin-top: 0; }
.tab-panel p { color: var(--text-soft); font-size: .94rem; }
.tab-panel b { color: var(--text); }
.feat li, .impact li { color: var(--text-soft); font-size: .94rem; padding-left: 4px; margin-bottom: 8px; }
.feat li b, .impact li b { color: var(--text); }
.stack li { display: grid; grid-template-columns: 120px 1fr; gap: 12px; padding: 9px 0; border-bottom: 1px dashed var(--border); color: var(--text-soft); font-size: .92rem; }
.stack li:last-child { border-bottom: none; }
.stack li span { font-weight: 700; color: var(--primary); }
.impact li { font-size: .96rem; }

.project-link {
  margin-top: auto; padding-top: 18px; font-weight: 700; color: var(--primary);
  display: inline-flex; align-items: center; align-self: flex-start;
}
.project-link:hover { gap: 4px; text-decoration: underline; }

/* ---------- 关于我 ---------- */
.about { padding: 70px 0; background: var(--bg-soft); }
.about-grid { display: grid; grid-template-columns: 1.7fr 1fr; gap: 40px; align-items: start; }
.about-bio { color: var(--text-soft); font-size: 1.02rem; }
.about-photo { margin: 0 0 26px; max-width: 272px; }
.about-photo img {
  width: 100%; height: auto; border-radius: var(--radius);
  border: 1px solid var(--border); box-shadow: var(--shadow);
}
.about-bio strong { color: var(--text); }
/* 金句：中文不用 italic（无真斜体会被合成变形），英文衬线斜体更好看 */
.about-quote {
  margin: 28px 0 0; padding: 2px 0 2px 22px;
  border-left: 3px solid var(--primary);
  font-family: var(--font-display); font-size: 1.08rem; font-weight: 500;
  line-height: 1.72; color: var(--text);
}
html[data-lang="en"] .about-quote { font-style: italic; }
.about-sub { font-size: 1.1rem; margin: 28px 0 14px; }
.skills { display: flex; flex-wrap: wrap; gap: 9px; }
.skill {
  font-size: .84rem; font-weight: 600; padding: 7px 13px; border-radius: 999px;
  background: var(--bg-elev); border: 1px solid var(--border); color: var(--text-soft);
}
.timeline { display: grid; gap: 4px; }
.timeline li { display: flex; gap: 14px; padding: 12px 0; border-left: 2px solid var(--border); padding-left: 18px; position: relative; }
.tl-dot { position: absolute; left: -7px; top: 18px; width: 12px; height: 12px; border-radius: 50%; background: var(--primary); border: 2px solid var(--bg-soft); }
.timeline b { display: block; color: var(--text); }
.tl-meta { font-size: .82rem; color: var(--text-mute); }

.about-side { position: sticky; top: 84px; }
.contact-card { background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow-sm); }
.contact-card h3 { margin-top: 0; }
.contact-list { display: grid; gap: 12px; margin-bottom: 14px; }
.contact-list li { display: flex; align-items: center; gap: 10px; color: var(--text-soft); font-size: .95rem; }
.contact-list a { color: var(--primary); font-weight: 600; }
.contact-hint { font-size: .85rem; color: var(--text-mute); margin: 0; }

/* ---------- 联系 CTA ---------- */
.contact-cta { padding: 80px 0; text-align: center; }
.contact-cta h2 { font-size: clamp(1.6rem, 4vw, 2.4rem); }
.contact-cta p { color: var(--text-soft); margin-bottom: 22px; }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--bg-elev); border-top: 1px solid var(--border); padding: 30px 0; }
.footer-inner { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; color: var(--text-mute); font-size: .86rem; }
.footer-note { margin: 0; }

/* ---------- 回到顶部 ---------- */
.to-top {
  position: fixed; right: 22px; bottom: 22px; z-index: 90;
  width: 46px; height: 46px; border-radius: 50%; border: 1px solid var(--border);
  background: var(--primary); color: #fff; font-size: 1.2rem; cursor: pointer;
  box-shadow: var(--shadow); opacity: 0; visibility: hidden; transform: translateY(10px);
  transition: opacity .25s, transform .25s, visibility .25s;
}
.to-top.show { opacity: 1; visibility: visible; transform: none; }

/* ---------- 滚动揭示动画 ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }

/* =========================================================
   竞赛奖项 & 科研经历（#honors）
   ========================================================= */
.block-title {
  margin: 0 0 16px; font-size: .92rem; font-weight: 800; letter-spacing: .08em;
  color: var(--text-soft); text-transform: uppercase;
}
.awards-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 16px;
  margin-bottom: 38px;
}
.award-card {
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: 10px;
  padding: 18px; display: flex; flex-direction: column; gap: 8px;
  box-shadow: var(--shadow-sm); transition: transform .2s ease, box-shadow .2s ease;
}
.award-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.award-name { margin: 0; font-size: .95rem; line-height: 1.45; overflow-wrap: anywhere; }
.award-period { margin: 0; font-size: .78rem; color: var(--text-mute); letter-spacing: .03em; }
.award-note { margin: 2px 0 0; font-size: .76rem; color: var(--text-soft); letter-spacing: .01em; }
.award-note a { color: var(--accent, #6b7cff); text-decoration: underline; text-underline-offset: 2px; }
.award-note a:hover { opacity: .82; }
[data-theme="contrast"] .award-note a { color: #ffe600; }
/* 多枚徽章并列：同一竞赛的多个名次（如 IMMC 两项、CTB 三项）各自成胶囊，flex-wrap 自动换行 */
.award-levels { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 2px; }
.award-levels .award-level { margin-top: 0; }
.award-level {
  align-self: flex-start; margin-top: 2px; padding: 5px 12px; border-radius: 999px;
  font-size: .78rem; font-weight: 800; line-height: 1.55; border: 1px solid transparent;
}
/* 徽章等级（颜色 + 文字双编码，不单独依赖颜色传达） */
.lv-gold   { background: rgba(212, 160, 23, .16);  color: #92600a; border-color: rgba(212, 160, 23, .45); }
.lv-silver { background: rgba(100, 116, 139, .14); color: #475569; border-color: rgba(100, 116, 139, .4); }
.lv-bronze { background: rgba(181, 112, 58, .16);  color: #8a4b21; border-color: rgba(181, 112, 58, .45); }
.lv-other  { background: var(--bg-soft);           color: var(--text-soft); border-color: var(--border); }
[data-theme="dark"] .lv-gold   { color: #f5c542; }
[data-theme="dark"] .lv-silver { color: #b4c0d0; }
[data-theme="dark"] .lv-bronze { color: #d28a5a; }
[data-theme="contrast"] .award-level {
  background: #ffe600; color: #000; border-color: #fff;
}

.research-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
.research-item {
  display: grid; grid-template-columns: minmax(0, 1fr) auto;
  column-gap: 14px; row-gap: 6px; align-items: start;
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: 10px; padding: 14px 18px;
  box-shadow: var(--shadow-sm);
}
.research-venue { font-weight: 700; grid-column: 1; grid-row: 1; }
.research-status {
  grid-column: 2; grid-row: 1; justify-self: end;
  padding: 4px 12px; border-radius: 999px; font-size: .78rem; font-weight: 800;
  background: color-mix(in srgb, var(--primary) 14%, transparent); color: var(--primary);
  border: 1px solid color-mix(in srgb, var(--primary) 35%, transparent);
}
.research-title { grid-column: 1 / -1; grid-row: 2; font-size: .88rem; color: var(--text-soft); line-height: 1.5; }
.research-author {
  grid-column: 1 / -1; grid-row: 3; margin: 2px 0 0;
  font-size: .82rem; color: var(--text-soft); line-height: 1.5;
}
.research-author span {
  display: inline-block; margin-right: 8px; padding: 1px 8px;
  border: 1px solid var(--border); border-radius: 6px; background: var(--bg-soft);
  font-size: .72rem; font-weight: 700; letter-spacing: .02em; color: var(--text-mute);
}
[data-theme="contrast"] .research-author span { color: #ffe600; border-color: #fff; }
@media (max-width: 560px) {
  .research-item { grid-template-columns: minmax(0, 1fr); }
  .research-status { grid-column: 1; grid-row: 2; justify-self: start; }
  .research-title { grid-row: 3; }
  .research-author { grid-row: 4; }
}

/* =========================================================
   项目与社会实践（#experience）
   ========================================================= */
.exp-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); gap: 16px;
}
.exp-card {
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: 10px;
  padding: 20px; display: flex; flex-direction: column; gap: 10px;
  box-shadow: var(--shadow-sm); transition: transform .2s ease, box-shadow .2s ease;
}
.exp-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.exp-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 10px; flex-wrap: wrap; }
.exp-title { margin: 0; font-size: 1rem; line-height: 1.4; }
.exp-role {
  flex-shrink: 0; padding: 4px 10px; border-radius: 999px; font-size: .74rem; font-weight: 700;
  background: var(--bg-soft); color: var(--text-soft); border: 1px solid var(--border);
}
.exp-desc { margin: 0; font-size: .88rem; line-height: 1.65; color: var(--text-soft); }
.exp-links { margin-top: auto; display: flex; gap: 16px; flex-wrap: wrap; }
.exp-link { font-size: .85rem; font-weight: 800; color: var(--primary); text-decoration: none; }
.exp-link:hover { text-decoration: underline; }
.exp-link.ext::after { content: " ↗"; }

/* =========================================================
   公益与艺术（#welfare）
   ========================================================= */
.welfare-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.welfare-card {
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: 10px;
  padding: 22px; box-shadow: var(--shadow-sm);
}
.welfare-h { margin: 0 0 12px; font-size: 1.05rem; }
.welfare-list { margin: 0; padding-left: 18px; display: grid; gap: 8px; line-height: 1.6; }
.welfare-desc { margin: 0; line-height: 1.7; color: var(--text-soft); }

/* =========================================================
   响应式
   ========================================================= */
/* 导航由 8 项增至 9 项，中等宽度屏提前压缩内边距与字号，避免挤成两行 */
/* 导航 9 项 + 品牌名不换行，1700px 以下一律压缩，否则英文站「Welfare & Art」会折行 */
@media (max-width: 1700px) {
  .nav-links { gap: 4px; }
  .nav-link { padding: 8px 9px; font-size: .88rem; }
}

@media (max-width: 900px) {
  .project-card { grid-template-columns: 1fr; }
  .project-media { border-right: none; border-bottom: 1px solid var(--border); }
  .about-grid { grid-template-columns: 1fr; }
  .about-side { position: static; }
}

@media (max-width: 720px) {
  .nav-links {
    position: fixed; inset: 66px 0 auto 0; flex-direction: column; gap: 0;
    background: var(--bg-elev); border-bottom: 1px solid var(--border);
    padding: 10px 18px 18px; transform: translateY(-130%); transition: transform .3s ease;
    box-shadow: var(--shadow);
  }
  .nav-links.open { transform: none; }
  .nav-link { padding: 12px 8px; border-radius: 8px; }
  .menu-toggle { display: flex; }
  .hero { padding: 64px 0 52px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .guide-card { flex-direction: column; gap: 12px; padding: 22px; }
  .stack li { grid-template-columns: 90px 1fr; }
  .welfare-grid { grid-template-columns: 1fr; }
}

@media (max-width: 420px) {
  .hero-stats { grid-template-columns: 1fr 1fr; }
}