/* ═══════════════════════════════════════════════
   守艺·传薪 —— 非遗数字化传承与公众认知调研
   华中科技大学计算机学院暑期实践队 · 品牌单页
   ═══════════════════════════════════════════════ */

:root{
  --dai:#1F3A5F;        /* 黛蓝 */
  --ink:#152A44;        /* 墨蓝 */
  --ink-deep:#0E1E31;
  --gold:#C6A15B;       /* 鎏金 */
  --gold-light:#E8CF9A;
  --gold-deep:#9A7A3C;
  --cinnabar:#B03A2E;   /* 朱砂红 */
  --paper:#F6F1E7;      /* 宣纸米白 */
  --mist:#EDEFF3;       /* 浅灰蓝 */
  --text:#2B2B2B;
  --muted:#6B7280;
  --serif:"Noto Serif SC","Source Han Serif SC","Source Han Serif CN","STSong","STZhongsong","SimSun",serif;
  --sans:"Noto Sans SC","Source Han Sans SC","Source Han Sans CN","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --ease:cubic-bezier(.22,.61,.36,1);
  --shadow-sm:0 2px 10px rgba(21,42,68,.06);
  --shadow-md:0 12px 32px rgba(21,42,68,.12);
  --shadow-lg:0 22px 54px rgba(21,42,68,.18);
}

*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{
  font-family:var(--sans);
  color:var(--text);
  background:var(--paper);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit}
ul{list-style:none}
::selection{background:rgba(198,161,91,.35)}

.container{max-width:1200px;margin:0 auto;padding:0 28px}

/* ─────────── 顶部导航 ─────────── */
.nav{
  position:fixed;inset:0 0 auto 0;z-index:100;
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  background:linear-gradient(180deg,rgba(21,42,68,.42),rgba(21,42,68,.18));
  border-bottom:1px solid rgba(198,161,91,.18);
  transition:background .45s var(--ease),box-shadow .45s var(--ease);
}
.nav.scrolled{
  background:rgba(246,241,231,.86);
  box-shadow:0 6px 24px rgba(21,42,68,.14);
  border-bottom:1px solid rgba(31,58,95,.08);
}
.nav-inner{
  max-width:1280px;margin:0 auto;padding:0 28px;
  height:72px;display:flex;align-items:center;justify-content:space-between;
}
.brand{display:flex;align-items:center;gap:12px}
.brand-seal{
  width:40px;height:40px;flex:none;
  display:flex;align-items:center;justify-content:center;
  background:linear-gradient(145deg,#C4453A,var(--cinnabar));
  color:#FBF6EC;font-family:var(--serif);font-weight:700;font-size:.78rem;
  line-height:1.05;text-align:center;letter-spacing:.05em;
  border-radius:7px;transform:rotate(-4deg);
  box-shadow:0 3px 8px rgba(176,58,46,.4),inset 0 0 0 1.5px rgba(251,246,236,.55);
  writing-mode:vertical-rl;
}
.brand-text{
  font-family:var(--serif);font-weight:900;font-size:1.32rem;
  color:var(--paper);letter-spacing:.12em;transition:color .45s;
}
.brand-text i{font-style:normal;color:var(--gold)}
.nav.scrolled .brand-text{color:var(--dai)}
.nav-menu{display:flex;gap:6px}
.nav-link{
  position:relative;display:block;padding:10px 14px;
  font-size:.95rem;letter-spacing:.08em;color:rgba(246,241,231,.85);
  transition:color .3s;
}
.nav-link::after{
  content:"";position:absolute;left:14px;right:14px;bottom:4px;height:2px;
  background:linear-gradient(90deg,var(--gold),transparent);
  transform:scaleX(0);transform-origin:left;transition:transform .35s var(--ease);
}
.nav-link:hover,.nav-link.active{color:var(--gold-light)}
.nav-link:hover::after,.nav-link.active::after{transform:scaleX(1)}
.nav.scrolled .nav-link{color:var(--dai)}
.nav.scrolled .nav-link:hover,.nav.scrolled .nav-link.active{color:var(--cinnabar)}
.nav.scrolled .nav-link::after{background:linear-gradient(90deg,var(--cinnabar),transparent)}

.nav-toggle{
  display:none;width:44px;height:44px;border:none;background:transparent;
  cursor:pointer;flex-direction:column;justify-content:center;align-items:center;gap:6px;
}
.nav-toggle span{
  width:24px;height:2px;background:var(--paper);border-radius:2px;
  transition:transform .35s var(--ease),opacity .3s,background .45s;
}
.nav.scrolled .nav-toggle span{background:var(--dai)}
.nav-toggle.open span:nth-child(1){transform:translateY(8px) rotate(45deg)}
.nav-toggle.open span:nth-child(2){opacity:0}
.nav-toggle.open span:nth-child(3){transform:translateY(-8px) rotate(-45deg)}

/* ─────────── 按钮 ─────────── */
.btn{
  display:inline-block;padding:14px 38px;border-radius:999px;
  font-size:1rem;letter-spacing:.14em;font-weight:600;
  transition:transform .35s var(--ease),box-shadow .35s,background .35s,color .35s;
}
.btn-primary{
  background:linear-gradient(145deg,#C24539,var(--cinnabar));color:#FBF6EC;
  box-shadow:0 10px 26px rgba(176,58,46,.38);
}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 16px 34px rgba(176,58,46,.48)}
.btn-outline{
  color:var(--gold-light);box-shadow:inset 0 0 0 1.5px rgba(198,161,91,.75);
}
.btn-outline:hover{background:rgba(198,161,91,.14);transform:translateY(-3px);box-shadow:inset 0 0 0 1.5px var(--gold)}

/* ─────────── HERO ─────────── */
.hero{
  position:relative;min-height:100vh;min-height:100svh;
  display:flex;align-items:center;justify-content:center;text-align:center;
  background:
    radial-gradient(1100px 520px at 72% -10%,rgba(198,161,91,.16),transparent 60%),
    radial-gradient(900px 600px at 12% 110%,rgba(176,58,46,.12),transparent 60%),
    linear-gradient(158deg,#24436B 0%,var(--dai) 30%,var(--ink) 62%,var(--ink-deep) 100%);
  overflow:hidden;
}
.hero-pattern{
  position:absolute;inset:0;pointer-events:none;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='36' height='36'%3E%3Cpath d='M18 6l12 12-12 12L6 18z' fill='none' stroke='%23C6A15B' stroke-opacity='0.10'/%3E%3Ccircle cx='18' cy='18' r='1.1' fill='%23C6A15B' fill-opacity='0.16'/%3E%3C/svg%3E");
  -webkit-mask-image:radial-gradient(ellipse 90% 80% at 50% 45%,#000 30%,transparent 100%);
  mask-image:radial-gradient(ellipse 90% 80% at 50% 45%,#000 30%,transparent 100%);
}
.hero-particles{position:absolute;inset:0;width:100%;height:100%}
.hero-vertical{
  position:absolute;right:4.5%;top:50%;transform:translateY(-50%);
  writing-mode:vertical-rl;font-family:var(--serif);
  font-size:1.05rem;letter-spacing:.62em;color:rgba(198,161,91,.55);
  user-select:none;
}
.hero-content{position:relative;z-index:2;padding:120px 28px 90px;max-width:960px}
.hero-kicker{
  font-size:.92rem;letter-spacing:.42em;color:rgba(246,241,231,.72);
  text-indent:.42em;margin-bottom:26px;
}
.hero-kicker::before,.hero-kicker::after{
  content:"";display:inline-block;vertical-align:middle;
  width:44px;height:1px;background:linear-gradient(90deg,transparent,var(--gold));margin-right:16px;
}
.hero-kicker::after{background:linear-gradient(90deg,var(--gold),transparent);margin:0 0 0 16px}
.hero-title{
  position:relative;display:inline-block;
  font-family:var(--serif);font-weight:900;
  font-size:clamp(3.4rem,10vw,6.8rem);line-height:1.15;letter-spacing:.1em;
  background:linear-gradient(178deg,#F3E3BC 8%,var(--gold-light) 38%,var(--gold) 66%,#A8823F 100%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
  filter:drop-shadow(0 6px 22px rgba(0,0,0,.35));
  margin-bottom:30px;
}
.hero-title .dot{
  background:linear-gradient(178deg,#F3E3BC,var(--gold));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero-title::after{
  content:"守艺";position:absolute;right:-64px;top:6px;
  writing-mode:vertical-rl;font-size:1.02rem;letter-spacing:.12em;
  font-weight:700;color:#FBF6EC;line-height:1.1;padding:9px 6px;
  background:linear-gradient(150deg,#C4453A,var(--cinnabar));
  border-radius:6px;transform:rotate(5deg);
  box-shadow:0 5px 14px rgba(176,58,46,.45),inset 0 0 0 1.5px rgba(251,246,236,.5);
}
.hero-sub{
  font-family:var(--serif);font-size:clamp(1.02rem,2.4vw,1.35rem);
  color:rgba(246,241,231,.92);letter-spacing:.1em;margin-bottom:14px;
}
.hero-slogan{
  font-size:.98rem;letter-spacing:.5em;text-indent:.5em;
  color:var(--gold);margin-bottom:44px;
}
.hero-cta{display:flex;gap:18px;justify-content:center;flex-wrap:wrap;margin-bottom:64px}
.hero-stats{
  display:flex;justify-content:center;gap:clamp(28px,6vw,72px);
  border-top:1px solid rgba(198,161,91,.28);padding-top:30px;
  max-width:720px;margin:0 auto;
}
.stat{display:flex;flex-direction:column;align-items:center;gap:2px}
.stat-num{
  font-family:var(--serif);font-weight:900;font-size:2.1rem;color:var(--gold-light);
  line-height:1.2;
}
.stat-num::after{content:"";display:block;width:22px;height:2px;margin:4px auto 0;background:var(--cinnabar)}
.stat-label{font-size:.82rem;letter-spacing:.28em;text-indent:.28em;color:rgba(246,241,231,.66)}

.hero-scroll{
  position:absolute;left:50%;bottom:26px;transform:translateX(-50%);
  display:flex;flex-direction:column;align-items:center;gap:10px;z-index:2;
}
.hero-scroll-text{
  font-size:.74rem;letter-spacing:.4em;text-indent:.4em;color:rgba(246,241,231,.6);
}
.hero-scroll-line{
  width:1.5px;height:52px;background:rgba(198,161,91,.3);
  position:relative;overflow:hidden;
}
.hero-scroll-line::after{
  content:"";position:absolute;left:0;top:-40%;width:100%;height:40%;
  background:var(--gold);animation:scrollDown 1.8s var(--ease) infinite;
}
@keyframes scrollDown{
  0%{top:-40%}60%,100%{top:110%}
}

/* ─────────── 章节通用 ─────────── */
.section{padding:112px 0;position:relative}
.bg-paper{
  background-color:var(--paper);
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2'/%3E%3C/filter%3E%3Crect width='240' height='240' filter='url(%23n)' opacity='0.045'/%3E%3C/svg%3E");
}
.bg-mist{
  background-color:var(--mist);
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2'/%3E%3C/filter%3E%3Crect width='240' height='240' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");
}
.bg-ink{
  background:
    radial-gradient(900px 480px at 85% 0%,rgba(198,161,91,.08),transparent 60%),
    linear-gradient(180deg,var(--ink) 0%,#12233A 100%);
  color:#EDE8DB;
}
.bg-ink::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(198,161,91,.055) 1px,transparent 1px),
    linear-gradient(90deg,rgba(198,161,91,.055) 1px,transparent 1px);
  background-size:46px 46px;
  -webkit-mask-image:radial-gradient(ellipse 80% 70% at 50% 30%,#000 20%,transparent 90%);
  mask-image:radial-gradient(ellipse 80% 70% at 50% 30%,#000 20%,transparent 90%);
}
.bg-ink .container{position:relative;z-index:1}
.sec-head{text-align:center;max-width:820px;margin:0 auto 64px}
.sec-eyebrow{
  display:inline-flex;align-items:center;gap:12px;
  font-size:.88rem;letter-spacing:.4em;
  color:var(--gold-deep);margin-bottom:18px;font-weight:600;
}
.sec-no{
  display:inline-flex;align-items:center;justify-content:center;
  width:34px;height:34px;font-family:var(--serif);font-size:1rem;
  color:var(--gold);box-shadow:inset 0 0 0 1px rgba(198,161,91,.65);
  border-radius:6px;transform:rotate(-4deg);letter-spacing:0;
}
.sec-title{
  font-family:var(--serif);font-weight:900;color:var(--dai);
  font-size:clamp(1.9rem,4.2vw,2.7rem);letter-spacing:.14em;line-height:1.3;
}
.sec-title::after{
  content:"";display:block;width:52px;height:3px;margin:20px auto 0;
  background:linear-gradient(90deg,var(--cinnabar),var(--gold));border-radius:2px;
}
.sec-lead{margin-top:22px;color:var(--muted);font-size:1.02rem;line-height:2}
.bg-ink .sec-title{color:var(--paper)}
.bg-ink .sec-lead{color:rgba(237,232,219,.66)}
.bg-ink .sec-eyebrow{color:var(--gold)}

/* ─────────── 模块 2 · 实践背景 ─────────── */
.chain{
  display:flex;align-items:center;justify-content:center;
  margin:-6px 0 56px;flex-wrap:wrap;
}
.chain-node{
  font-family:var(--serif);font-weight:700;font-size:1.05rem;letter-spacing:.3em;text-indent:.3em;
  color:var(--dai);background:#fff;padding:11px 30px;border-radius:999px;
  box-shadow:var(--shadow-sm),inset 0 0 0 1px rgba(198,161,91,.55);
}
.chain-arrow{
  width:64px;height:1.5px;margin:0 10px;position:relative;
  background:linear-gradient(90deg,rgba(198,161,91,.25),var(--gold));
}
.chain-arrow::after{
  content:"";position:absolute;right:-1px;top:50%;transform:translateY(-50%);
  border-left:8px solid var(--gold);
  border-top:5px solid transparent;border-bottom:5px solid transparent;
}
.cards-3{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.bg-card{
  position:relative;background:#fff;border-radius:16px;padding:44px 32px 38px;
  border:1px solid rgba(31,58,95,.08);box-shadow:var(--shadow-sm);
  transition:transform .5s var(--ease),box-shadow .5s var(--ease);
  overflow:hidden;
}
.bg-card::before{
  content:"";position:absolute;top:0;left:0;right:0;height:3px;
  background:linear-gradient(90deg,var(--gold),rgba(198,161,91,.15));
}
.bg-card:hover{transform:translateY(-8px);box-shadow:var(--shadow-md)}
.bg-card-icon{
  width:66px;height:66px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  color:var(--gold-deep);background:rgba(198,161,91,.13);
  box-shadow:inset 0 0 0 1px rgba(198,161,91,.4);
  margin-bottom:22px;transition:transform .5s var(--ease);
}
.bg-card-icon svg{width:32px;height:32px}
.bg-card:hover .bg-card-icon{transform:scale(1.08) rotate(-5deg)}
.bg-card-index{
  position:absolute;top:18px;right:24px;
  font-family:var(--serif);font-size:2.6rem;color:rgba(31,58,95,.07);
}
.bg-card-title{
  font-family:var(--serif);font-size:1.5rem;font-weight:900;
  color:var(--dai);letter-spacing:.22em;margin-bottom:6px;
}
.bg-card-sub{
  font-size:.82rem;letter-spacing:.3em;color:var(--gold-deep);
  margin-bottom:16px;font-weight:600;
}
.bg-card-text{color:var(--muted);font-size:.95rem;line-height:1.95}
.bg-note{
  margin:52px auto 0;max-width:820px;text-align:center;
  color:var(--muted);font-size:1rem;line-height:2;
}
.bg-note span{
  color:var(--cinnabar);font-weight:600;
  background:linear-gradient(transparent 62%,rgba(198,161,91,.35) 62%);
  padding:0 2px;
}

/* ─────────── 模块 3 · 调研足迹 ─────────── */
.proj-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.proj-card{
  background:#fff;border-radius:16px;overflow:hidden;
  border:1px solid rgba(31,58,95,.08);box-shadow:var(--shadow-sm);
  transition:transform .5s var(--ease),box-shadow .5s var(--ease);
  display:flex;flex-direction:column;
}
.proj-card:hover{transform:translateY(-9px);box-shadow:var(--shadow-lg)}
.proj-media{position:relative;aspect-ratio:4/3;overflow:hidden;background:var(--dai)}
.proj-media img{
  width:100%;height:100%;object-fit:cover;
  transition:transform .8s var(--ease);
}
.proj-card:hover .proj-media img{transform:scale(1.08)}
.proj-media::after{
  content:"";position:absolute;inset:12px;pointer-events:none;
  border:1.5px solid rgba(198,161,91,.0);
  transition:border-color .5s var(--ease),box-shadow .5s;
}
.proj-card:hover .proj-media::after{
  border-color:rgba(198,161,91,.9);
  box-shadow:inset 0 0 0 1px rgba(21,42,68,.25);
}
.proj-num{
  position:absolute;top:14px;left:14px;z-index:2;
  font-family:var(--serif);font-weight:700;font-size:.92rem;letter-spacing:.1em;
  color:var(--gold-light);background:rgba(21,42,68,.68);
  backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);
  padding:5px 12px;border-radius:999px;border:1px solid rgba(198,161,91,.45);
}
.proj-body{padding:22px 24px 20px;display:flex;flex-direction:column;flex:1}
.proj-name{
  font-family:var(--serif);font-weight:900;font-size:1.28rem;
  color:var(--dai);letter-spacing:.06em;margin-bottom:10px;
}
.proj-meta{
  display:flex;align-items:center;justify-content:space-between;
  gap:10px;margin-bottom:12px;flex-wrap:wrap;
}
.proj-place{font-size:.84rem;color:var(--muted);letter-spacing:.06em}
.proj-level{
  font-size:.72rem;font-weight:600;letter-spacing:.08em;
  padding:4px 11px;border-radius:999px;white-space:nowrap;
}
.level-national{color:var(--cinnabar);background:rgba(176,58,46,.1);box-shadow:inset 0 0 0 1px rgba(176,58,46,.28)}
.level-province{color:var(--dai);background:rgba(31,58,95,.09);box-shadow:inset 0 0 0 1px rgba(31,58,95,.24)}
.level-city{color:var(--gold-deep);background:rgba(198,161,91,.14);box-shadow:inset 0 0 0 1px rgba(198,161,91,.4)}
.proj-desc{color:var(--muted);font-size:.92rem;line-height:1.85;flex:1}
.proj-member{
  display:flex;align-items:center;gap:8px;
  margin-top:16px;padding-top:14px;
  border-top:1px dashed rgba(31,58,95,.16);
  font-size:.84rem;color:var(--gold-deep);letter-spacing:.06em;font-weight:600;
}
.proj-member svg{width:15px;height:15px;flex:none}

/* ─────────── 模块 4 · 数字赋能 ─────────── */
.dg-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.dg-item{
  background:rgba(246,241,231,.045);
  border:1px solid rgba(198,161,91,.2);
  border-radius:16px;padding:34px 28px;
  transition:transform .5s var(--ease),border-color .5s,box-shadow .5s,background .5s;
}
.dg-item:hover{
  transform:translateY(-7px);
  border-color:rgba(198,161,91,.65);
  background:rgba(246,241,231,.07);
  box-shadow:0 18px 44px rgba(0,0,0,.35),0 0 0 1px rgba(198,161,91,.12);
}
.dg-icon{
  width:54px;height:54px;margin-bottom:20px;color:var(--gold);
  transition:transform .5s var(--ease);
}
.dg-icon svg{width:100%;height:100%}
.dg-item:hover .dg-icon{transform:scale(1.1) rotate(-4deg)}
.dg-item h3{
  font-family:var(--serif);font-size:1.18rem;font-weight:700;
  color:var(--gold-light);letter-spacing:.08em;margin-bottom:10px;
}
.dg-item p{font-size:.9rem;color:rgba(237,232,219,.68);line-height:1.9}

/* ─────────── 模块 5 · 实践时间线 ─────────── */
.tl{max-width:960px;margin:0 auto;position:relative;padding:10px 0}
.tl::before{
  content:"";position:absolute;top:0;bottom:0;left:50%;width:2px;
  transform:translateX(-50%);
  background:linear-gradient(180deg,transparent,var(--gold) 8%,var(--gold) 92%,transparent);
  opacity:.6;
}
.tl-item{position:relative;width:50%;padding:0 56px 48px 0}
.tl-item.tl-right{margin-left:50%;padding:0 0 48px 56px}
.tl-item:last-child{padding-bottom:0}
.tl-dot{
  position:absolute;top:26px;right:-10px;width:20px;height:20px;border-radius:50%;
  background:var(--paper);box-shadow:inset 0 0 0 2px var(--gold);
}
.tl-dot::after{
  content:"";position:absolute;inset:5px;border-radius:50%;background:var(--cinnabar);
}
.tl-right .tl-dot{right:auto;left:-10px}
.tl-card{
  background:#fff;border-radius:14px;padding:28px 30px;
  border:1px solid rgba(31,58,95,.08);box-shadow:var(--shadow-sm);
  transition:transform .5s var(--ease),box-shadow .5s var(--ease);
}
.tl-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-md)}
.tl-date{
  display:inline-block;font-family:var(--serif);font-weight:900;
  font-size:1.02rem;color:var(--cinnabar);letter-spacing:.08em;margin-bottom:8px;
}
.tl-title{
  font-family:var(--serif);font-size:1.24rem;font-weight:900;
  color:var(--dai);letter-spacing:.06em;margin-bottom:6px;
}
.tl-place{font-size:.84rem;color:var(--gold-deep);letter-spacing:.08em;margin-bottom:12px;font-weight:600}
.tl-text{color:var(--muted);font-size:.94rem;line-height:1.95}

/* ─────────── 模块 6 · 团队风采 ─────────── */
.mentor{
  display:flex;align-items:center;gap:26px;
  max-width:620px;margin:0 auto 52px;
  background:#fff;border-radius:16px;padding:30px 36px;
  border:1px solid rgba(198,161,91,.35);box-shadow:var(--shadow-sm);
  transition:transform .5s var(--ease),box-shadow .5s var(--ease);
}
.mentor:hover{transform:translateY(-6px);box-shadow:var(--shadow-md)}
.mentor-avatar{
  width:88px;height:88px;flex:none;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  font-family:var(--serif);font-size:2.2rem;font-weight:900;color:#FBF6EC;
  background:linear-gradient(145deg,#C24539,var(--cinnabar));
  box-shadow:0 0 0 4px #fff,0 0 0 5.5px var(--gold),0 10px 22px rgba(176,58,46,.3);
}
.mentor-info h3{
  font-family:var(--serif);font-size:1.45rem;font-weight:900;
  color:var(--dai);letter-spacing:.14em;margin-bottom:4px;
}
.mentor-role{
  display:inline-block;font-size:.78rem;font-weight:600;letter-spacing:.24em;
  color:var(--cinnabar);background:rgba(176,58,46,.09);
  padding:4px 14px;border-radius:999px;margin-bottom:10px;
}
.mentor-desc{color:var(--muted);font-size:.92rem;line-height:1.85}
.team-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.member{
  background:#fff;border-radius:14px;padding:32px 18px 26px;text-align:center;
  border:1px solid rgba(31,58,95,.08);box-shadow:var(--shadow-sm);
  transition:transform .5s var(--ease),box-shadow .5s var(--ease);
}
.member:hover{transform:translateY(-7px);box-shadow:var(--shadow-md)}
.member-avatar{
  width:72px;height:72px;margin:0 auto 16px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  font-family:var(--serif);font-size:1.7rem;font-weight:900;color:#F6F1E7;
  background:linear-gradient(145deg,#2A4A76,var(--ink));
  box-shadow:0 0 0 3px #fff,0 0 0 4.5px rgba(198,161,91,.65);
  transition:transform .5s var(--ease);
}
.member:hover .member-avatar{transform:scale(1.07) rotate(-4deg)}
.member h3{
  font-family:var(--serif);font-size:1.18rem;font-weight:900;
  color:var(--dai);letter-spacing:.14em;margin-bottom:10px;
}
.member-tag{
  display:inline-block;font-size:.74rem;font-weight:600;letter-spacing:.14em;
  padding:4px 13px;border-radius:999px;margin-bottom:12px;
}
.tag-lead{color:var(--cinnabar);background:rgba(176,58,46,.1);box-shadow:inset 0 0 0 1px rgba(176,58,46,.3)}
.tag-talk{color:var(--dai);background:rgba(31,58,95,.09);box-shadow:inset 0 0 0 1px rgba(31,58,95,.26)}
.tag-film{color:var(--gold-deep);background:rgba(198,161,91,.15);box-shadow:inset 0 0 0 1px rgba(198,161,91,.42)}
.tag-data{color:#3E6B8F;background:rgba(62,107,143,.1);box-shadow:inset 0 0 0 1px rgba(62,107,143,.3)}
.tag-safe{color:#5B6470;background:rgba(107,114,128,.12);box-shadow:inset 0 0 0 1px rgba(107,114,128,.32)}
.member p{color:var(--muted);font-size:.82rem;line-height:1.8}

/* ─────────── 模块 7 · 成果展示 ─────────── */
.ach-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.ach-item{
  position:relative;background:#fff;border-radius:16px;
  padding:40px 26px 34px;text-align:center;
  border:1px solid rgba(31,58,95,.08);box-shadow:var(--shadow-sm);
  transition:transform .5s var(--ease),box-shadow .5s var(--ease);
  overflow:hidden;
}
.ach-item::before{
  content:"";position:absolute;top:0;left:50%;width:0;height:3px;
  background:linear-gradient(90deg,var(--cinnabar),var(--gold));
  transform:translateX(-50%);transition:width .5s var(--ease);
}
.ach-item:hover{transform:translateY(-8px);box-shadow:var(--shadow-md)}
.ach-item:hover::before{width:100%}
.ach-icon{
  width:64px;height:64px;margin:0 auto 20px;border-radius:18px;
  display:flex;align-items:center;justify-content:center;
  color:var(--dai);background:var(--mist);
  box-shadow:inset 0 0 0 1px rgba(31,58,95,.12);
  transition:transform .5s var(--ease),color .4s,background .4s;
}
.ach-icon svg{width:32px;height:32px}
.ach-item:hover .ach-icon{
  transform:scale(1.12) rotate(-5deg);
  color:var(--cinnabar);background:rgba(176,58,46,.08);
}
.ach-item h3{
  font-family:var(--serif);font-size:1.16rem;font-weight:900;
  color:var(--dai);letter-spacing:.08em;margin-bottom:10px;
}
.ach-item p{color:var(--muted);font-size:.88rem;line-height:1.85}

/* ─────────── 模块 8 · 页脚 ─────────── */
.footer{
  background:
    radial-gradient(700px 300px at 20% 0%,rgba(198,161,91,.09),transparent 60%),
    linear-gradient(180deg,var(--ink) 0%,var(--ink-deep) 100%);
  color:rgba(246,241,231,.72);
}
.footer-grid{
  display:grid;grid-template-columns:1.3fr 1.3fr 1fr;gap:44px;
  padding:72px 28px 52px;
}
.footer-brand{display:flex;align-items:center;gap:14px;margin-bottom:18px}
.footer-name{
  font-family:var(--serif);font-size:1.5rem;font-weight:900;
  color:var(--paper);letter-spacing:.14em;
}
.footer-col h4{
  font-family:var(--serif);font-size:1rem;font-weight:700;
  color:var(--gold);letter-spacing:.3em;margin-bottom:18px;
}
.footer-col h4::after{
  content:"";display:block;width:26px;height:2px;margin-top:8px;
  background:var(--cinnabar);
}
.footer-desc{font-size:.9rem;line-height:2}
.footer-slogan{
  margin-top:12px;font-family:var(--serif);
  color:var(--gold-light);letter-spacing:.2em;font-size:.92rem;
}
.footer-links li{margin-bottom:10px}
.footer-links a{
  font-size:.9rem;color:rgba(246,241,231,.66);
  transition:color .3s,padding-left .3s;
}
.footer-links a:hover{color:var(--gold);padding-left:6px}
.footer-bottom{
  border-top:1px solid rgba(246,241,231,.1);
  text-align:center;padding:24px 20px;
  font-size:.82rem;letter-spacing:.1em;color:rgba(246,241,231,.45);
}

/* ─────────── 回到顶部 ─────────── */
.to-top{
  position:fixed;right:26px;bottom:26px;z-index:90;
  width:48px;height:48px;border:none;border-radius:50%;cursor:pointer;
  background:var(--dai);color:var(--gold-light);
  box-shadow:0 8px 22px rgba(21,42,68,.35),inset 0 0 0 1.5px rgba(198,161,91,.5);
  opacity:0;transform:translateY(14px);pointer-events:none;
  transition:opacity .4s,transform .4s var(--ease),background .3s;
}
.to-top svg{width:22px;height:22px;margin:auto}
.to-top{display:flex;align-items:center;justify-content:center}
.to-top.show{opacity:1;transform:translateY(0);pointer-events:auto}
.to-top:hover{background:var(--cinnabar)}

/* ─────────── 滚动淡入动画 ─────────── */
.reveal{
  opacity:0;transform:translateY(38px);
  transition:opacity .9s var(--ease),transform .9s var(--ease);
  will-change:opacity,transform;
}
.reveal.in{opacity:1;transform:translateY(0)}

/* ─────────── 响应式 ─────────── */
@media (max-width:1024px){
  .proj-grid{grid-template-columns:repeat(2,1fr)}
  .dg-grid{grid-template-columns:repeat(2,1fr)}
  .team-grid{grid-template-columns:repeat(2,1fr)}
  .ach-grid{grid-template-columns:repeat(2,1fr)}
  .cards-3{gap:20px}
}
@media (max-width:860px){
  .section{padding:88px 0}
  .nav-toggle{display:flex}
  .nav-menu{
    position:fixed;top:72px;left:0;right:0;
    flex-direction:column;gap:0;
    background:rgba(21,42,68,.96);
    backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
    padding:12px 0 20px;
    transform:translateY(-130%);opacity:0;pointer-events:none;
    transition:transform .5s var(--ease),opacity .4s;
    border-bottom:1px solid rgba(198,161,91,.25);
  }
  .nav-menu.open{transform:translateY(0);opacity:1;pointer-events:auto}
  .nav-menu .nav-link{padding:14px 32px;color:rgba(246,241,231,.85);font-size:1rem}
  .nav-menu .nav-link::after{left:32px;right:auto;width:36px}
  .nav.scrolled .nav-menu .nav-link{color:rgba(246,241,231,.85)}
  .cards-3{grid-template-columns:1fr;max-width:560px;margin:0 auto}
  .chain{flex-direction:column;gap:14px}
  .chain-arrow{
    width:1.5px;height:34px;margin:0;
    background:linear-gradient(180deg,rgba(198,161,91,.25),var(--gold));
  }
  .chain-arrow::after{
    right:auto;left:50%;top:auto;bottom:-1px;
    transform:translateX(-50%);
    border-left:5px solid transparent;border-right:5px solid transparent;
    border-top:8px solid var(--gold);border-bottom:none;
  }
  .hero-vertical{display:none}
  .hero-title::after{right:-16px;top:-30px;font-size:.9rem}
  /* 时间线改为左侧单线 */
  .tl::before{left:12px}
  .tl-item,.tl-item.tl-right{width:100%;margin-left:0;padding:0 0 40px 44px}
  .tl-dot,.tl-right .tl-dot{left:3px;right:auto}
  .mentor{flex-direction:column;text-align:center;padding:34px 26px}
}
@media (max-width:560px){
  .container{padding:0 20px}
  .proj-grid{grid-template-columns:1fr}
  .dg-grid{grid-template-columns:1fr}
  .ach-grid{grid-template-columns:1fr}
  .hero-stats{display:grid;grid-template-columns:repeat(2,1fr);gap:22px 10px}
  .hero-content{padding:110px 20px 80px}
  .btn{padding:13px 30px;font-size:.94rem}
  .footer-grid{grid-template-columns:1fr;gap:36px;padding:60px 20px 44px}
}
@media (max-width:400px){
  .team-grid{grid-template-columns:1fr}
}

/* ─────────── 降低动态偏好 ─────────── */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  .hero-scroll-line::after{animation:none}
  *{transition-duration:.01ms !important;animation-duration:.01ms !important}
}