/* =========================================================
   子页面共享样式 · about / agenda / speakers / partners
========================================================= */
:root{
  --obsidian:#040B16;
  --carbon:#0A1A2E;
  --abyss:#02070F;
  --red:#E60012;
  --energy:#FF2438;
  --ice:#8FD8FF;
  --silver:#93A1B4;
  --white:#F2F6FA;
  --en:"Space Grotesk","Archivo","Noto Sans SC",sans-serif;
  --cn:"Noto Sans SC","Archivo",sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
body{background:var(--obsidian);color:var(--white);font-family:var(--en);-webkit-font-smoothing:antialiased;min-height:100vh}
a{color:inherit;text-decoration:none}
::selection{background:var(--red);color:var(--white)}

/* ---------- shared header (injected by page.js) ---------- */
.site-nav{
  display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap;
  padding:18px clamp(20px,4vw,64px);
  border-bottom:1px solid rgba(143,216,255,.09);
  background:rgba(4,11,22,.85);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  position:sticky;top:0;z-index:50;
}
.brand{display:flex;align-items:center;gap:12px;font-weight:700}
.brand .octo{width:28px;height:28px;flex:none}
.brand .btxt{display:flex;flex-direction:column;line-height:1.15}
.brand .btxt .cn{font-family:var(--cn);font-size:13px;font-weight:700;letter-spacing:.12em}
.brand .btxt .en{font-size:8px;letter-spacing:.26em;color:var(--silver);text-transform:uppercase}
.site-links{display:flex;gap:clamp(12px,2vw,28px);flex-wrap:wrap}
.site-links a{
  font-size:10.5px;letter-spacing:.22em;text-transform:uppercase;color:var(--silver);
  padding:6px 0;position:relative;transition:color .3s;
}
.site-links a::after{content:"";position:absolute;left:0;bottom:0;height:1px;width:0;background:var(--ice);transition:width .35s}
.site-links a:hover{color:var(--white)}
.site-links a:hover::after{width:100%}
.site-links a.active{color:var(--white)}
.site-links a.active::after{width:100%}
.nav-cta{
  font-size:10.5px;letter-spacing:.22em;text-transform:uppercase;font-weight:600;
  border:1px solid rgba(245,245,245,.28);padding:9px 18px;transition:.35s;
}
.nav-cta:hover{background:var(--red);border-color:var(--red)}

/* ---------- shared footer ---------- */
.site-foot{border-top:1px solid rgba(143,216,255,.10);padding:44px clamp(20px,4vw,64px);margin-top:clamp(60px,10vh,110px)}
.site-foot .row{display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap;align-items:center}
.site-foot .cn{font-family:var(--cn);font-size:12px;letter-spacing:.3em;color:var(--silver)}
.site-foot .en{font-size:9.5px;letter-spacing:.38em;color:var(--silver);text-transform:uppercase;line-height:2.2}

/* ---------- generic page elements ---------- */
.page{max-width:1400px;margin:0 auto;padding:clamp(50px,8vh,100px) clamp(20px,4.5vw,72px) 0}
.kicker{
  font-size:11px;letter-spacing:.5em;text-transform:uppercase;color:var(--silver);
  display:flex;align-items:center;gap:16px;font-weight:500;
}
.kicker::before{content:"";width:40px;height:1px;background:var(--ice)}
.mega{
  font-weight:900;text-transform:uppercase;line-height:.95;letter-spacing:-.01em;
  font-size:clamp(38px,6.4vw,104px);margin-top:26px;
}
.page-sub{margin-top:22px;font-family:var(--cn);color:var(--silver);letter-spacing:.24em;font-size:clamp(13px,1.5vw,17px);line-height:2}
.reveal{opacity:0;transform:translateY(36px);transition:opacity 1s cubic-bezier(.2,.8,.2,1),transform 1s cubic-bezier(.2,.8,.2,1)}
.reveal.in{opacity:1;transform:none}
.rare-red{color:var(--energy)}
.ice{color:var(--ice)}
.btn{
  display:inline-flex;align-items:center;gap:14px;
  font-size:12px;letter-spacing:.26em;text-transform:uppercase;font-weight:700;
  padding:18px 36px;border:1px solid rgba(245,245,245,.3);transition:.35s;
}
.btn .b-cn{font-family:var(--cn);letter-spacing:.34em}
.btn.solid{background:var(--red);border-color:var(--red);color:#fff}
.btn.solid:hover{background:var(--energy);border-color:var(--energy)}
.btn.ghost:hover{border-color:var(--ice);color:var(--ice)}

/* ---------- agenda timeline ---------- */
.tl{margin-top:clamp(44px,7vh,70px);border-top:1px solid rgba(143,216,255,.12)}
.tl-row{
  display:grid;grid-template-columns:130px 1fr auto;gap:clamp(18px,3vw,48px);align-items:baseline;
  padding:clamp(22px,3.4vh,34px) 4px;border-bottom:1px solid rgba(143,216,255,.12);
  transition:background .4s,padding-left .4s;
}
.tl-row:hover{background:rgba(143,216,255,.04);padding-left:16px}
.tl-time{font-weight:700;font-size:clamp(15px,1.7vw,21px);letter-spacing:.08em;color:var(--ice)}
.tl-title{font-family:var(--cn);font-weight:700;font-size:clamp(16px,2vw,24px);letter-spacing:.06em;line-height:1.6}
.tl-desc{margin-top:6px;font-family:var(--cn);font-size:13px;color:var(--silver);letter-spacing:.08em;line-height:1.8}
.tl-tag{
  font-size:9.5px;letter-spacing:.26em;text-transform:uppercase;color:var(--silver);
  border:1px solid rgba(143,216,255,.22);padding:8px 14px;white-space:nowrap;
}
.tl-tag.main{color:var(--ice);border-color:var(--ice)}

/* ---------- speakers grid ---------- */
.sp-grid{
  margin-top:clamp(44px,7vh,70px);
  display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:clamp(20px,2.6vw,36px);
}
.sg-card{display:block}
.sg-face{
  aspect-ratio:3/4;background:var(--carbon);position:relative;overflow:hidden;
  display:flex;align-items:flex-end;justify-content:center;
  filter:grayscale(1) contrast(1.05);transition:filter .6s;
}
.sg-card:hover .sg-face{filter:grayscale(0)}
.sg-face img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:top center}
.sg-face .mono{
  font-weight:900;font-size:clamp(80px,8vw,120px);line-height:.8;
  color:transparent;-webkit-text-stroke:1px rgba(147,161,180,.5);
  transform:translateY(14%);transition:-webkit-text-stroke-color .6s;
}
.sg-card:hover .sg-face .mono{-webkit-text-stroke-color:var(--ice)}
.sg-face::after{
  content:"";position:absolute;inset:0;
  background:repeating-linear-gradient(0deg,transparent 0 7px,rgba(143,216,255,.05) 7px 8px);
  opacity:.4;transition:opacity .6s;pointer-events:none;
}
.sg-card:hover .sg-face::after{opacity:1}
.sg-info{margin-top:16px}
.sg-name{font-family:var(--cn);font-weight:900;font-size:19px;letter-spacing:.1em}
.sg-role{margin-top:7px;font-size:11px;letter-spacing:.18em;color:var(--silver);text-transform:uppercase;line-height:1.8}
.sg-topic{margin-top:9px;font-family:var(--cn);font-size:12.5px;color:var(--ice);letter-spacing:.06em;line-height:1.7}

/* ---------- partner tiers & logo grid ---------- */
.tiers{margin-top:clamp(44px,7vh,70px);display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(16px,2vw,28px)}
.tier{
  border:1px solid rgba(143,216,255,.14);padding:clamp(28px,4vh,44px) clamp(22px,2.6vw,38px);
  background:rgba(10,26,46,.35);transition:border-color .4s,transform .4s;
}
.tier:hover{border-color:var(--ice);transform:translateY(-6px)}
.tier .t-no{font-size:13px;font-weight:700;color:transparent;-webkit-text-stroke:1px rgba(147,161,180,.6);letter-spacing:.2em}
.tier .t-name{margin-top:16px;font-family:var(--cn);font-weight:900;font-size:clamp(20px,2.2vw,28px);letter-spacing:.1em}
.tier .t-en{margin-top:8px;font-size:10px;letter-spacing:.3em;text-transform:uppercase;color:var(--silver)}
.tier .t-list{margin-top:22px;font-family:var(--cn);font-size:13.5px;color:var(--silver);letter-spacing:.08em;line-height:2.4;list-style:none}
.tier .t-list li::before{content:"—  ";color:var(--ice)}
.logo-grid{
  margin-top:clamp(40px,6vh,60px);
  display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:14px;
}
.logo-cell{
  display:flex;align-items:center;justify-content:center;height:84px;
  border:1px solid rgba(143,216,255,.12);color:rgba(147,161,180,.75);
  font-weight:700;letter-spacing:.22em;font-size:14px;text-transform:uppercase;
  filter:grayscale(1);transition:.4s;background:rgba(10,26,46,.35);
}
.logo-cell:hover{filter:grayscale(0);color:var(--white);border-color:var(--ice)}

/* ---------- about page ---------- */
.about-lead{
  margin-top:clamp(36px,6vh,56px);max-width:880px;
  font-family:var(--cn);font-weight:300;font-size:clamp(16px,1.9vw,21px);
  line-height:2.4;letter-spacing:.08em;color:var(--silver);
}
.about-lead strong{color:var(--white);font-weight:700}
.stat-row{margin-top:clamp(44px,7vh,70px);display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:rgba(143,216,255,.12);border:1px solid rgba(143,216,255,.12)}
.stat{background:var(--obsidian);padding:clamp(30px,5vh,52px) clamp(20px,2.6vw,40px);text-align:center}
.stat .n{font-weight:900;font-size:clamp(48px,7vw,110px);line-height:1}
.stat .l{margin-top:12px;font-size:10.5px;letter-spacing:.42em;color:var(--silver);text-transform:uppercase}
.upgrade{
  margin-top:clamp(44px,7vh,70px);display:flex;align-items:center;justify-content:center;
  gap:clamp(20px,4vw,56px);flex-wrap:wrap;text-align:center;
}
.upgrade .side{font-weight:800;text-transform:uppercase;font-size:clamp(12px,1.4vw,17px);letter-spacing:.28em;color:var(--silver);max-width:320px;line-height:2}
.upgrade .side.to{color:var(--white)}
.upgrade .arr{font-size:clamp(26px,3vw,42px);color:var(--ice)}
.pillars{margin-top:clamp(44px,7vh,70px);display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(16px,2vw,28px)}
.pillar{border-top:2px solid var(--ice);padding-top:24px}
.pillar .p-no{font-size:12px;letter-spacing:.4em;color:var(--silver)}
.pillar .p-cn{margin-top:14px;font-family:var(--cn);font-weight:900;font-size:clamp(24px,2.8vw,38px);letter-spacing:.08em}
.pillar .p-en{margin-top:8px;font-size:11px;letter-spacing:.3em;text-transform:uppercase;color:var(--silver)}
.pillar .p-key{margin-top:16px;font-family:var(--cn);font-size:14px;color:var(--ice);letter-spacing:.3em}

/* ---------- registration ---------- */
.register-page{
  max-width:1540px;display:grid;grid-template-columns:minmax(280px,.72fr) minmax(540px,1.28fr);
  gap:clamp(42px,7vw,110px);align-items:start;
}
.register-intro{position:sticky;top:130px;padding-bottom:40px}
.register-intro .mega{font-size:clamp(48px,6.3vw,98px)}
.register-lead{margin-top:28px;font-family:var(--cn);font-size:clamp(18px,2vw,26px);font-weight:700;letter-spacing:.12em}
.register-meta{margin-top:24px;padding:20px 0;border-top:1px solid rgba(143,216,255,.18);border-bottom:1px solid rgba(143,216,255,.18);display:flex;gap:16px;justify-content:space-between;flex-wrap:wrap;color:var(--ice);font-size:11px;letter-spacing:.28em}
.register-note{margin-top:24px;max-width:520px;font-family:var(--cn);font-size:13px;line-height:2;color:var(--silver);letter-spacing:.08em}
.register-index{margin-top:clamp(40px,8vh,86px);display:flex;flex-direction:column;gap:14px;color:rgba(147,161,180,.55);font-size:9px;letter-spacing:.34em}
.register-panel{border:1px solid rgba(143,216,255,.14);background:linear-gradient(145deg,rgba(10,26,46,.72),rgba(4,11,22,.88));padding:clamp(26px,4vw,58px);position:relative;overflow:hidden}
.register-panel::before{content:"";position:absolute;inset:0 0 auto;height:2px;background:linear-gradient(90deg,var(--red),var(--ice),transparent 72%)}
.form-section-head{display:flex;align-items:center;gap:18px;margin-bottom:28px}
.form-step{font-size:12px;color:var(--ice);border:1px solid rgba(143,216,255,.35);width:38px;height:38px;display:grid;place-items:center}
.form-section-head strong{display:block;font-family:var(--cn);font-size:17px;letter-spacing:.12em}
.form-section-head small{display:block;margin-top:5px;color:var(--silver);font-size:8.5px;letter-spacing:.34em}
.section-gap{margin-top:50px}
.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:26px 22px}
.field-wide{grid-column:1/-1}
.field label,.message-field>label{display:flex;justify-content:space-between;gap:16px;margin-bottom:10px;font-family:var(--cn);font-size:12px;letter-spacing:.08em;color:var(--white)}
.field label span,.message-field>label span{font-family:var(--en);font-size:8.5px;letter-spacing:.24em;color:var(--silver);text-transform:uppercase}
.field input,.field select,.field textarea{
  appearance:none;width:100%;border:0;border-bottom:1px solid rgba(143,216,255,.24);border-radius:0;
  background:rgba(2,7,15,.48);color:var(--white);font:400 14px/1.5 var(--cn);padding:14px 13px;outline:none;
  transition:border-color .25s,background .25s,box-shadow .25s;
}
.field select{background-image:linear-gradient(45deg,transparent 50%,var(--ice) 50%),linear-gradient(135deg,var(--ice) 50%,transparent 50%);background-position:calc(100% - 17px) 20px,calc(100% - 12px) 20px;background-size:5px 5px,5px 5px;background-repeat:no-repeat;padding-right:38px}
.field select option{background:var(--carbon);color:var(--white)}
.field textarea{resize:vertical;min-height:118px;line-height:1.8}
.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--ice);background:rgba(143,216,255,.055);box-shadow:0 1px 0 var(--ice)}
.field input[aria-invalid="true"],.field select[aria-invalid="true"],.field textarea[aria-invalid="true"]{border-color:var(--energy)}
.field-error{display:block;min-height:17px;margin-top:7px;font-family:var(--cn);font-size:11px;color:#ff7581;letter-spacing:.04em}
.interest-grid{border:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.interest-grid label{display:block;cursor:pointer}
.interest-grid input{position:absolute;opacity:0;pointer-events:none}
.interest-grid label>span{display:block;min-height:74px;border:1px solid rgba(143,216,255,.16);padding:15px 17px;font-family:var(--cn);font-size:12.5px;letter-spacing:.06em;transition:.25s}
.interest-grid label>span small{display:block;margin-top:8px;font-family:var(--en);font-size:8px;color:var(--silver);letter-spacing:.2em}
.interest-grid input:checked+span{border-color:var(--ice);background:rgba(143,216,255,.09);box-shadow:inset 3px 0 0 var(--red)}
.interest-grid input:focus-visible+span{outline:2px solid var(--ice);outline-offset:2px}
.message-field{margin-top:28px}
.privacy-row{margin-top:32px;padding-top:24px;border-top:1px solid rgba(143,216,255,.13)}
.privacy-row>label{display:flex;align-items:flex-start;gap:13px;cursor:pointer;font-family:var(--cn);font-size:12px;line-height:1.8;color:var(--silver)}
.privacy-row input{appearance:none;flex:none;width:18px;height:18px;margin-top:4px;border:1px solid rgba(143,216,255,.48);display:grid;place-items:center;cursor:pointer}
.privacy-row input::after{content:"";width:8px;height:8px;background:var(--ice);transform:scale(0);transition:transform .2s}
.privacy-row input:checked::after{transform:scale(1)}
.privacy-row input:focus-visible{outline:2px solid var(--ice);outline-offset:3px}
.privacy-row label small{display:block;margin-top:3px;font-family:var(--en);font-size:8px;letter-spacing:.12em;line-height:1.6}
.register-submit{margin-top:26px;width:100%;min-height:64px;border:1px solid var(--red);background:var(--red);color:#fff;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:0 24px;cursor:pointer;transition:.3s}
.register-submit:hover:not(:disabled){background:var(--energy);border-color:var(--energy)}
.register-submit:disabled{cursor:wait;opacity:.65}
.submit-cn{font:700 14px var(--cn);letter-spacing:.2em}
.submit-en{font:700 10px var(--en);letter-spacing:.2em}
.submit-hint{margin-top:12px;text-align:right;color:var(--silver);font-size:8px;letter-spacing:.2em}
.form-alert{margin-bottom:26px;border-left:3px solid var(--energy);background:rgba(230,0,18,.10);padding:14px 16px;font-family:var(--cn);font-size:12px;line-height:1.8;color:#ffadb4}
.hp-field{position:absolute!important;width:1px!important;height:1px!important;overflow:hidden!important;clip:rect(1px,1px,1px,1px)!important;white-space:nowrap!important}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.registration-success{min-height:650px;padding:clamp(28px,5vw,70px) clamp(4px,2vw,24px);display:flex;flex-direction:column;justify-content:center;outline:none}
.registration-success[hidden]{display:none}
.success-mark{width:62px;height:62px;display:grid;place-items:center;border:1px solid var(--ice);color:var(--ice);font-size:22px;margin-bottom:38px;box-shadow:0 0 38px rgba(143,216,255,.12)}
.registration-success .kicker{font-size:9px}
.registration-success h2{margin-top:22px;font-family:var(--cn);font-size:clamp(34px,5vw,62px);letter-spacing:.06em;line-height:1.25}
.registration-success p{margin-top:25px;max-width:640px;font-family:var(--cn);font-size:clamp(14px,1.5vw,17px);line-height:2.1;color:var(--silver);letter-spacing:.05em}
.success-actions{margin-top:38px;display:flex;gap:14px;flex-wrap:wrap}

@media(max-width:860px){
  .tl-row{grid-template-columns:1fr;gap:8px}
  .tiers,.pillars,.stat-row{grid-template-columns:1fr}
  .register-page{grid-template-columns:1fr;gap:24px}
  .register-intro{position:static}
  .register-index{display:none}
}
@media(max-width:620px){
  .register-panel{padding:25px 18px}
  .form-grid,.interest-grid{grid-template-columns:1fr}
  .field-wide{grid-column:auto}
  .success-actions .btn{width:100%;justify-content:center}
}