/* =========================================================
   山大创协 SIEA 官网 · 深海启航正式版
   改文案请去 index.html；改配色改这里的 :root 变量即可
   ========================================================= */
@font-face {
  font-family: 'Smiley Sans';
  src: url('../assets/SmileySans-Oblique.woff2') format('woff2');
  font-display: swap;
}
:root {
  --bg: #04070f;
  --bg2: #071224;
  --ink: #eaf4ff;
  --dim: rgba(234, 244, 255, .58);
  --line: rgba(120, 180, 255, .16);
  --blue: #3e8bff;
  --cyan: #6fe3ff;
  --glow: rgba(62, 139, 255, .55);
  --card: rgba(120, 180, 255, .05);
  --disp: 'Smiley Sans', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --body: 'PingFang SC', 'HarmonyOS Sans SC', 'Microsoft YaHei', -apple-system, sans-serif;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: auto; }
html.lenis, html.lenis body { height: auto; }
.lenis.lenis-smooth { scroll-behavior: auto !important; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--body);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
::selection { background: var(--blue); color: #fff; }
button { font-family: inherit; }

/* ===== 自定义光标 ===== */
.cursor-dot, .cursor-ring {
  position: fixed; top: 0; left: 0; pointer-events: none; z-index: 9999;
  border-radius: 50%; transform: translate(-50%, -50%);
}
.cursor-dot { width: 6px; height: 6px; background: var(--cyan); }
.cursor-ring {
  width: 34px; height: 34px; border: 1px solid rgba(111, 227, 255, .5);
  transition: width .25s, height .25s, border-color .25s;
}
body.hovering .cursor-ring { width: 56px; height: 56px; border-color: var(--cyan); }
@media (hover: none) { .cursor-dot, .cursor-ring { display: none; } }

/* ===== 顶部导航 ===== */
nav#topnav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 42px;
  background: linear-gradient(rgba(4, 7, 15, .72), rgba(4, 7, 15, 0));
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
}
.nav-logo { display: flex; align-items: baseline; gap: 10px; text-decoration: none; }
.nav-logo b {
  font-family: var(--disp); font-size: 26px; letter-spacing: 1px;
  background: linear-gradient(100deg, var(--cyan), var(--blue));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.nav-logo span { font-size: 12px; color: var(--dim); letter-spacing: 3px; }
.nav-links { display: flex; gap: 26px; }
.nav-links a {
  color: var(--dim); text-decoration: none; font-size: 14px; letter-spacing: 2px;
  transition: color .25s; position: relative;
}
.nav-links a::after {
  content: ''; position: absolute; left: 0; bottom: -6px; height: 1px; width: 0%;
  background: linear-gradient(90deg, var(--cyan), transparent); transition: width .3s;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a:hover::after { width: 100%; }
.nav-right { display: flex; align-items: center; gap: 14px; }
.nav-cta {
  font-size: 13px; letter-spacing: 2px; color: #fff; text-decoration: none;
  padding: 9px 22px; border-radius: 100px;
  border: 1px solid rgba(111, 227, 255, .35);
  background: linear-gradient(100deg, rgba(62, 139, 255, .25), rgba(111, 227, 255, .12));
  transition: box-shadow .3s, transform .3s;
}
.nav-cta:hover { box-shadow: 0 0 24px var(--glow); transform: translateY(-1px); }
.nav-burger {
  display: none; flex-direction: column; gap: 6px; padding: 10px 6px;
  background: none; border: none; cursor: pointer;
}
.nav-burger i { display: block; width: 24px; height: 2px; background: var(--ink); transition: transform .3s, opacity .3s; }
body.menu-open .nav-burger i:nth-child(1) { transform: translateY(4px) rotate(45deg); }
body.menu-open .nav-burger i:nth-child(2) { transform: translateY(-4px) rotate(-45deg); }
#progress {
  position: fixed; top: 0; left: 0; height: 2px; width: 100%; z-index: 101;
  background: linear-gradient(90deg, var(--blue), var(--cyan));
  transform-origin: 0 50%; transform: scaleX(0);
}

/* 移动端全屏菜单 */
.m-menu {
  position: fixed; inset: 0; z-index: 99; display: flex; flex-direction: column;
  justify-content: center; gap: 8px; padding: 0 12vw;
  background: rgba(4, 7, 15, .96); backdrop-filter: blur(20px);
  opacity: 0; pointer-events: none; transition: opacity .35s;
}
body.menu-open .m-menu { opacity: 1; pointer-events: auto; }
.m-menu a {
  color: var(--ink); text-decoration: none; font-family: var(--disp);
  font-size: 30px; padding: 10px 0; letter-spacing: 2px;
  border-bottom: 1px solid var(--line);
}
.m-menu a.m-join { color: var(--cyan); border-bottom: none; margin-top: 14px; }
@media (max-width: 960px) {
  .nav-links { display: none; }
  nav#topnav { padding: 14px 20px; }
  .nav-burger { display: flex; }
}

/* ===== Hero ===== */
#hero { position: relative; height: 100vh; min-height: 640px; overflow: hidden; }
#sea { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.hero-halo { position: absolute; border-radius: 50%; filter: blur(90px); pointer-events: none; }
.halo-1 { width: 46vw; height: 46vw; left: -12vw; top: -14vw; background: rgba(62, 139, 255, .17); }
.halo-2 { width: 34vw; height: 34vw; right: -8vw; bottom: -6vw; background: rgba(111, 227, 255, .10); }
.hero-inner {
  position: relative; z-index: 2; height: 100%;
  display: flex; flex-direction: column; justify-content: center; align-items: center;
  text-align: center; padding: 0 20px;
}
.hero-kicker {
  display: flex; align-items: center; gap: 14px;
  color: var(--cyan); font-size: 13px; letter-spacing: 6px; margin-bottom: 26px;
}
.hero-kicker::before, .hero-kicker::after {
  content: ''; width: 46px; height: 1px;
  background: linear-gradient(90deg, transparent, var(--cyan));
}
.hero-kicker::after { transform: scaleX(-1); }
h1 {
  font-family: var(--disp); font-weight: 400;
  font-size: clamp(44px, 8.4vw, 118px); line-height: 1.06; letter-spacing: 2px;
}
h1 .row { display: block; overflow: hidden; }
h1 .char { display: inline-block; transform: translateY(110%); }
.hero-sub {
  margin-top: 30px; color: var(--dim); font-size: clamp(14px, 1.6vw, 18px);
  letter-spacing: 4px; opacity: 0;
}
.hero-btns { display: flex; gap: 18px; margin-top: 46px; opacity: 0; flex-wrap: wrap; justify-content: center; }
.btn-main, .btn-ghost {
  position: relative; text-decoration: none; letter-spacing: 3px; font-size: 15px;
  padding: 15px 40px; border-radius: 100px; transition: transform .3s, box-shadow .3s;
}
.btn-main {
  color: #fff; background: linear-gradient(100deg, var(--blue), #2f6bdb);
  box-shadow: 0 6px 30px rgba(62, 139, 255, .35);
}
.btn-main:hover { transform: translateY(-3px); box-shadow: 0 10px 44px rgba(62, 139, 255, .6); }
.btn-ghost { color: var(--ink); border: 1px solid var(--line); background: rgba(120,180,255,.04); }
.btn-ghost:hover { border-color: rgba(111,227,255,.5); transform: translateY(-3px); }
.hero-scroll {
  position: absolute; bottom: 34px; left: 50%; transform: translateX(-50%);
  color: var(--dim); font-size: 11px; letter-spacing: 4px; z-index: 2; text-align: center;
}
.hero-scroll .bar {
  width: 1px; height: 44px; margin: 12px auto 0;
  background: linear-gradient(var(--cyan), transparent);
  animation: drip 1.8s ease-in-out infinite;
}
@keyframes drip {
  0% { transform: scaleY(0); transform-origin: top; }
  55% { transform: scaleY(1); transform-origin: top; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ===== 通用 section ===== */
section { position: relative; padding: 120px 7vw; }
.sec-head { margin-bottom: 64px; }
.sec-tag {
  display: inline-flex; align-items: center; gap: 10px;
  color: var(--cyan); font-size: 12px; letter-spacing: 5px; margin-bottom: 18px;
}
.sec-tag::before { content: ''; width: 26px; height: 1px; background: var(--cyan); }
.sec-title { font-family: var(--disp); font-weight: 400; font-size: clamp(32px, 4.6vw, 58px); letter-spacing: 1px; }
.sec-title em, .belief-strong em, .join-box h2 em {
  font-style: normal;
  background: linear-gradient(96deg, var(--cyan), var(--blue));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.sec-desc { margin-top: 16px; color: var(--dim); max-width: 640px; line-height: 1.9; font-size: 15px; }
.reveal { opacity: 0; transform: translateY(46px); }

/* ===== 数字创协 ===== */
#stats { padding-top: 90px; padding-bottom: 70px; }
.stat-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px;
  background: var(--line); border: 1px solid var(--line); border-radius: 20px; overflow: hidden;
}
.stat {
  background: linear-gradient(160deg, rgba(10, 20, 40, .9), rgba(5, 10, 22, .9));
  padding: 44px 30px; position: relative; overflow: hidden;
}
.stat:hover .stat-flare { opacity: 1; }
.stat-flare {
  position: absolute; inset: -40%; opacity: 0; transition: opacity .5s;
  background: radial-gradient(circle at 30% 20%, rgba(111, 227, 255, .12), transparent 60%);
}
.stat b {
  font-family: var(--disp); font-weight: 400; font-size: clamp(38px, 4.4vw, 62px);
  background: linear-gradient(180deg, #fff, #9cc8ff);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.stat small { font-size: 20px; color: var(--cyan); font-family: var(--disp); }
.stat p { margin-top: 10px; color: var(--dim); font-size: 14px; letter-spacing: 2px; }
@media (max-width: 900px) { .stat-grid { grid-template-columns: repeat(2, 1fr); } }
.honor-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 26px; }
.honor {
  font-size: 13px; color: var(--dim); letter-spacing: 1px;
  border: 1px solid var(--line); border-radius: 100px; padding: 9px 18px;
  background: rgba(120, 180, 255, .04); transition: color .3s, border-color .3s;
}
.honor:hover { color: var(--cyan); border-color: rgba(111, 227, 255, .4); }

/* ===== 我们相信 ===== */
#belief { padding-top: 90px; padding-bottom: 90px; }
.belief-text {
  font-family: var(--disp); font-weight: 400;
  font-size: clamp(28px, 4.2vw, 54px); line-height: 1.5; letter-spacing: 1px;
  max-width: 1080px;
}
.belief-text .w { color: rgba(234, 244, 255, .16); transition: color .2s; }
.belief-strong {
  margin-top: 40px; font-family: var(--disp);
  font-size: clamp(20px, 2.4vw, 30px); color: var(--ink); letter-spacing: 1px;
}

/* ===== 品牌活动：自由横滑 ===== */
#acts { padding-left: 0; padding-right: 0; }
.acts-head {
  display: flex; align-items: flex-end; justify-content: space-between;
  gap: 20px; padding: 0 7vw; margin-bottom: 44px;
}
.acts-arrows { display: flex; gap: 12px; }
.arr {
  width: 52px; height: 52px; border-radius: 50%;
  border: 1px solid var(--line); background: rgba(120, 180, 255, .05);
  color: var(--ink); font-size: 19px; cursor: pointer;
  transition: border-color .3s, background .3s, transform .2s, opacity .3s;
}
.arr:hover { border-color: rgba(111, 227, 255, .55); background: rgba(120, 180, 255, .12); transform: translateY(-2px); }
.arr:disabled { opacity: .3; cursor: default; transform: none; }
.acts-viewport {
  overflow-x: auto; overflow-y: hidden;
  cursor: grab;
  scrollbar-width: none; -ms-overflow-style: none;
  -webkit-overflow-scrolling: touch;
}
.acts-viewport::-webkit-scrollbar { display: none; }
.acts-viewport.dragging { cursor: grabbing; scroll-behavior: auto; }
.acts-track { display: flex; gap: 26px; padding: 6px 7vw 18px; width: max-content; }
.act-card {
  flex: 0 0 clamp(300px, 34vw, 430px); border-radius: 22px; padding: 40px 34px;
  min-height: 390px; display: flex; flex-direction: column; justify-content: flex-end;
  background: var(--card); border: 1px solid var(--line); position: relative; overflow: hidden;
  transition: border-color .35s, transform .35s;
  user-select: none; -webkit-user-select: none;
}
.act-card:hover { border-color: rgba(111, 227, 255, .45); transform: translateY(-8px); }
.act-num {
  position: absolute; top: 26px; right: 30px; font-family: var(--disp);
  font-size: 60px; color: rgba(120, 180, 255, .14);
}
.act-icon { font-size: 40px; margin-bottom: auto; filter: drop-shadow(0 0 14px rgba(111,227,255,.4)); }
.act-card h3 { font-family: var(--disp); font-weight: 400; font-size: 30px; margin: 22px 0 6px; }
.act-card .en { color: var(--cyan); font-size: 11px; letter-spacing: 3px; text-transform: uppercase; }
.act-card p { margin-top: 14px; color: var(--dim); font-size: 14px; line-height: 1.85; }
.act-card::after {
  content: ''; position: absolute; left: 0; right: 0; bottom: 0; height: 3px;
  background: linear-gradient(90deg, var(--blue), var(--cyan));
  transform: scaleX(0); transform-origin: left; transition: transform .45s;
}
.act-card:hover::after { transform: scaleX(1); }
.acts-progress { margin: 34px 7vw 0; height: 2px; background: var(--line); border-radius: 2px; }
.acts-progress i {
  display: block; height: 100%; width: 0%;
  background: linear-gradient(90deg, var(--blue), var(--cyan)); border-radius: 2px;
}

/* ===== 时间线 ===== */
#story .timeline { position: relative; margin-top: 20px; }
.tl-rail { position: absolute; left: 19px; top: 0; bottom: 0; width: 2px; background: var(--line); }
.tl-rail i {
  display: block; width: 100%; height: 0%;
  background: linear-gradient(var(--cyan), var(--blue));
  box-shadow: 0 0 12px var(--glow);
}
.tl-item { position: relative; padding: 0 0 66px 74px; }
.tl-item:last-child { padding-bottom: 10px; }
.tl-dot {
  position: absolute; left: 12px; top: 6px; width: 16px; height: 16px; border-radius: 50%;
  background: var(--bg); border: 2px solid var(--cyan); box-shadow: 0 0 14px var(--glow);
}
.tl-year { font-family: var(--disp); font-size: 42px; color: var(--cyan); line-height: 1; }
.tl-item h3 { font-size: 21px; margin: 12px 0 8px; letter-spacing: 1px; }
.tl-item p { color: var(--dim); font-size: 14.5px; line-height: 1.9; max-width: 660px; }
.tl-item .tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.tl-item .tags span {
  font-size: 12px; color: var(--cyan); letter-spacing: 1px;
  border: 1px solid rgba(111, 227, 255, .3); padding: 4px 12px; border-radius: 100px;
}

/* ===== 孵化成果 ===== */
.inc-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; perspective: 1200px; }
.inc-card {
  border-radius: 22px; border: 1px solid var(--line); background: var(--card);
  padding: 38px 32px; min-height: 300px; transform-style: preserve-3d;
  transition: border-color .3s; position: relative; overflow: hidden;
}
.inc-card:hover { border-color: rgba(111, 227, 255, .4); }
.shine {
  position: absolute; inset: 0; opacity: 0; transition: opacity .4s; pointer-events: none;
  background: radial-gradient(600px circle at var(--mx, 50%) var(--my, 50%), rgba(111, 227, 255, .12), transparent 45%);
}
.inc-card:hover .shine, .bt-card:hover .shine { opacity: 1; }
.inc-kind { color: var(--cyan); font-size: 11px; letter-spacing: 4px; }
.inc-card h3 { font-family: var(--disp); font-weight: 400; font-size: 32px; margin: 16px 0 10px; }
.inc-card p { color: var(--dim); font-size: 14px; line-height: 1.9; }
.inc-num { display: flex; gap: 26px; margin-top: 24px; }
.inc-num div b { font-family: var(--disp); font-size: 26px; color: var(--cyan); display: block; }
.inc-num div span { font-size: 12px; color: var(--dim); }
@media (max-width: 900px) { .inc-grid { grid-template-columns: 1fr; } }

/* ===== 高光时刻 bento ===== */
.bento { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.bt-card {
  position: relative; overflow: hidden; border-radius: 20px;
  border: 1px solid var(--line); background: var(--card);
  padding: 30px 28px; min-height: 190px;
  display: flex; flex-direction: column; gap: 10px;
  transition: border-color .35s, transform .35s;
}
.bt-card:hover { border-color: rgba(111, 227, 255, .45); transform: translateY(-6px); }
.bt-big {
  grid-row: span 2;
  justify-content: flex-end; min-height: 400px;
  background: linear-gradient(200deg, rgba(62, 139, 255, .16), rgba(5, 10, 22, .6) 70%);
}
.bt-date {
  align-self: flex-start; font-size: 11px; letter-spacing: 3px; color: var(--cyan);
  border: 1px solid rgba(111, 227, 255, .3); padding: 4px 12px; border-radius: 100px;
}
.bt-card h3 { font-family: var(--disp); font-weight: 400; font-size: 24px; line-height: 1.3; }
.bt-big h3 { font-size: clamp(26px, 2.6vw, 36px); }
.bt-card p { color: var(--dim); font-size: 13.5px; line-height: 1.8; }
.bt-foot { color: rgba(120, 180, 255, .35); font-size: 12px; letter-spacing: 4px; margin-top: 8px; }
@media (max-width: 960px) { .bento { grid-template-columns: 1fr 1fr; } .bt-big { grid-row: span 1; min-height: 240px; } }
@media (max-width: 620px) { .bento { grid-template-columns: 1fr; } }

/* ===== 伙伴 marquee ===== */
#partners { padding-left: 0; padding-right: 0; }
#partners .sec-head { padding: 0 7vw; }
.marquee { overflow: hidden; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 30px 0; }
.marquee + .marquee { border-top: none; }
.marquee-track { display: flex; gap: 70px; width: max-content; animation: roll 36s linear infinite; }
.marquee:hover .marquee-track { animation-play-state: paused; }
.marquee.rev .marquee-track { animation-direction: reverse; }
@keyframes roll { to { transform: translateX(-50%); } }
.marquee span {
  font-family: var(--disp); font-size: 30px; color: rgba(234, 244, 255, .34);
  letter-spacing: 2px; white-space: nowrap; transition: color .3s; cursor: default;
}
.marquee span:hover { color: var(--cyan); }
.marquee b { color: rgba(111, 227, 255, .5); font-size: 16px; align-self: center; }

/* ===== 四大部门 ===== */
.dept-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.dept {
  --dc: var(--cyan);
  position: relative; overflow: hidden; text-align: left;
  display: flex; flex-direction: column; gap: 0;
  border: 1px solid var(--line); border-radius: 18px; padding: 30px 26px;
  background: var(--card); color: var(--ink); cursor: pointer;
  transition: transform .35s, border-color .35s, background .35s, box-shadow .35s;
}
.dept::before {
  content: ''; position: absolute; inset: 0 0 auto 0; height: 3px;
  background: linear-gradient(90deg, var(--dc), transparent);
  transform: scaleX(0); transform-origin: left; transition: transform .45s;
}
.dept:hover::before { transform: scaleX(1); }
.dept:hover {
  transform: translateY(-10px); border-color: rgba(111, 227, 255, .45);
  background: rgba(120, 180, 255, .09); box-shadow: 0 18px 50px rgba(0, 0, 0, .45);
}
.dept-idx {
  font-family: var(--disp); font-size: 15px; color: var(--dc);
  letter-spacing: 3px; margin-bottom: 18px; opacity: .85;
}
.dept .cn { font-family: var(--disp); font-size: 26px; }
.dept .alias { color: var(--dc); font-size: 12px; letter-spacing: 2px; margin: 8px 0 14px; display: block; }
.dept .d-desc { color: var(--dim); font-size: 13.5px; line-height: 1.8; display: block; }
.dept .d-open {
  margin-top: 20px; font-size: 12px; letter-spacing: 2px; color: var(--dim);
  display: inline-flex; align-items: center; gap: 8px; transition: color .3s;
}
.dept .d-open i { font-style: normal; transition: transform .3s; }
.dept:hover .d-open { color: var(--dc); }
.dept:hover .d-open i { transform: translateX(6px); }
.dept-wide {
  margin-top: 20px; width: 100%; flex-direction: row; align-items: center; gap: 30px;
  padding: 30px 34px;
}
.dept-wide .dept-idx { margin-bottom: 0; font-size: 22px; }
.dept-wide-main { flex: 1; display: flex; flex-direction: column; }
.dept-wide .d-open { margin-top: 0; white-space: nowrap; }
.dept[data-dept="proj"]  { --dc: #6fe3ff; }
.dept[data-dept="brand"] { --dc: #ffc46b; }
.dept[data-dept="hr"]    { --dc: #ff8fb8; }
.dept[data-dept="media"] { --dc: #7dffcf; }
.dept[data-dept="lab"]   { --dc: #b79bff; }
@media (max-width: 960px) {
  .dept-grid { grid-template-columns: repeat(2, 1fr); }
  .dept-wide { flex-direction: column; align-items: flex-start; gap: 12px; }
}
@media (max-width: 560px) { .dept-grid { grid-template-columns: 1fr; } }

/* ===== 加入我们 ===== */
#join { padding-bottom: 100px; }
.join-box { text-align: center; padding: 20px 0 10px; }
.join-box h2 { font-family: var(--disp); font-weight: 400; font-size: clamp(36px, 5.4vw, 72px); line-height: 1.25; }
.join-box p { color: var(--dim); margin: 18px 0 20px; letter-spacing: 3px; }
.join-steps {
  display: flex; align-items: stretch; justify-content: center; gap: 18px;
  max-width: 1020px; margin: 40px auto 0; flex-wrap: wrap;
}
.jstep {
  flex: 1; min-width: 220px; border: 1px solid var(--line); border-radius: 18px;
  background: var(--card); padding: 30px 26px; text-align: left;
  transition: border-color .3s, transform .3s;
}
.jstep:hover { border-color: rgba(111, 227, 255, .4); transform: translateY(-6px); }
.jstep b {
  font-family: var(--disp); font-size: 30px;
  background: linear-gradient(180deg, var(--cyan), var(--blue));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.jstep h4 { font-size: 18px; margin: 12px 0 8px; letter-spacing: 1px; }
.jstep p { color: var(--dim); font-size: 13.5px; line-height: 1.8; }
.jstep-line {
  align-self: center; width: 40px; height: 1px;
  background: linear-gradient(90deg, var(--cyan), transparent);
}
@media (max-width: 760px) { .jstep-line { display: none; } }
.join-cta { text-align: center; margin-top: 54px; }
.btn-join {
  display: inline-block; text-decoration: none; color: #fff; font-size: 17px; letter-spacing: 4px;
  padding: 20px 64px; border-radius: 100px;
  background: linear-gradient(100deg, var(--blue), #2f6bdb 60%, var(--cyan));
  background-size: 200% 100%; background-position: 0% 0%;
  box-shadow: 0 8px 40px rgba(62, 139, 255, .4);
  transition: background-position .5s, transform .3s, box-shadow .3s;
}
.btn-join:hover {
  background-position: 100% 0%; transform: translateY(-4px) scale(1.02);
  box-shadow: 0 14px 60px rgba(62, 139, 255, .65);
}
.join-note { margin-top: 18px; color: var(--dim); font-size: 12.5px; letter-spacing: 2px; }

/* ===== 页脚 ===== */
footer {
  border-top: 1px solid var(--line); padding: 44px 7vw 60px;
  display: flex; justify-content: space-between; align-items: flex-end; flex-wrap: wrap; gap: 20px;
}
footer .f-logo {
  font-family: var(--disp); font-size: 30px;
  background: linear-gradient(100deg, var(--cyan), var(--blue));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
footer p { color: var(--dim); font-size: 13px; line-height: 2; }
footer .right { text-align: right; }

/* ===== 部门深潜面板 ===== */
#deptOverlay {
  position: fixed; inset: 0; z-index: 200;
  background: radial-gradient(120% 120% at 20% 0%, #0a1830 0%, #04070f 55%);
  visibility: hidden; pointer-events: none;
}
#deptOverlay.open { visibility: visible; pointer-events: auto; }
#bubbles { position: absolute; inset: 0; width: 100%; height: 100%; }
.ov-frame { position: relative; z-index: 2; height: 100%; }
.ov-scroll {
  height: 100%; overflow-y: auto; padding: clamp(80px, 12vh, 130px) 8vw 60px;
  scrollbar-width: none;
}
.ov-scroll::-webkit-scrollbar { display: none; }
.ov-close {
  position: absolute; top: 26px; right: 30px; z-index: 5;
  width: 52px; height: 52px; border-radius: 50%;
  border: 1px solid var(--line); background: rgba(120, 180, 255, .06);
  color: var(--ink); font-size: 17px; cursor: pointer;
  transition: border-color .3s, transform .3s, background .3s;
}
.ov-close:hover { border-color: var(--dc, var(--cyan)); transform: rotate(90deg); background: rgba(120, 180, 255, .14); }
.ov-watermark {
  position: absolute; top: 4vh; right: 4vw; z-index: 0;
  font-family: var(--disp); font-size: clamp(160px, 26vw, 380px); line-height: 1;
  color: transparent; -webkit-text-stroke: 1px rgba(120, 180, 255, .12);
  pointer-events: none; user-select: none;
}
.ov-head { position: relative; z-index: 1; max-width: 900px; }
.ov-en { color: var(--dc, var(--cyan)); font-size: 13px; letter-spacing: 6px; }
.ov-name {
  font-family: var(--disp); font-weight: 400;
  font-size: clamp(44px, 7vw, 96px); line-height: 1.1; margin-top: 14px;
}
.ov-name .char { display: inline-block; }
.ov-slogan {
  margin-top: 12px; font-family: var(--disp); font-size: clamp(18px, 2.2vw, 26px);
  color: var(--dc, var(--cyan)); letter-spacing: 2px;
}
.ov-role { margin-top: 20px; color: var(--dim); font-size: 15px; line-height: 1.95; max-width: 700px; }
.ov-cols {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 54px;
}
.ov-col {
  border: 1px solid var(--line); border-radius: 18px; padding: 28px 24px;
  background: rgba(120, 180, 255, .04); position: relative; overflow: hidden;
}
.ov-col::before {
  content: ''; position: absolute; inset: 0 auto 0 0; width: 3px;
  background: linear-gradient(var(--dc, var(--cyan)), transparent);
}
.ov-col i {
  font-style: normal; font-size: 11px; letter-spacing: 4px; color: var(--dc, var(--cyan));
}
.ov-col h4 { font-family: var(--disp); font-weight: 400; font-size: 22px; margin: 14px 0 10px; }
.ov-col p { color: var(--dim); font-size: 13.5px; line-height: 1.9; }
.ov-fit { position: relative; z-index: 1; margin-top: 44px; }
.ov-fit-label { color: var(--dim); font-size: 12px; letter-spacing: 4px; }
.ov-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
.ov-tags span {
  font-size: 13px; letter-spacing: 1px; color: var(--ink);
  border: 1px solid var(--line); border-radius: 100px; padding: 8px 18px;
  background: rgba(120, 180, 255, .05);
}
.ov-tags span b { color: var(--dc, var(--cyan)); font-weight: 400; }
.ov-nav {
  position: relative; z-index: 1; margin-top: 60px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  border-top: 1px solid var(--line); padding-top: 26px;
}
.ov-nav button {
  background: none; border: 1px solid var(--line); color: var(--dim);
  border-radius: 100px; padding: 12px 26px; font-size: 13px; letter-spacing: 2px;
  cursor: pointer; transition: color .3s, border-color .3s, transform .3s;
}
.ov-nav button:hover { color: var(--ink); border-color: var(--dc, var(--cyan)); transform: translateY(-2px); }
#ovPos { color: var(--dim); font-size: 12px; letter-spacing: 3px; font-family: var(--disp); }
@media (max-width: 860px) {
  .ov-cols { grid-template-columns: 1fr; }
  .ov-watermark { top: auto; bottom: 2vh; }
  .ov-nav { flex-wrap: wrap; }
}

/* ===== 动效降级 ===== */
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; }
  h1 .char { transform: none; }
  .hero-sub, .hero-btns { opacity: 1; }
  .marquee-track { animation: none; }
}