/* ==========================================================================
   2026 RISC-V 产业发展大会 · 官网样式
   RISC-V Industry Development Conference — Site Stylesheet
   ========================================================================== */

:root{
  --primary:#185FA5;
  --primary-dark:#0C447C;
  --primary-light:#E6F1FB;
  --cta:#D85A30;
  --cta-dark:#B04A25;
  --gold:#C8A24A;
  --text:#1f2329;
  --muted:#5f6b7a;
  --hint:#8a94a3;
  --line:#e5e8ee;
  --bg:#f5f7fa;
  --card:#ffffff;
  --radius:12px;
  --shadow:0 1px 3px rgba(16,24,40,.05),0 1px 2px rgba(16,24,40,.04);
  --shadow-lg:0 12px 32px rgba(16,24,40,.10);
  --maxw:1200px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei","PingFang SC","Hiragino Sans GB",sans-serif;
  color:var(--text);background:var(--bg);font-size:14px;line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;display:block}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}

/* ---------- 顶栏 ---------- */
.sitebar{background:#fff;border-bottom:1px solid var(--line)}
.sitebar-in{max-width:var(--maxw);margin:0 auto;padding:0 24px;height:60px;display:flex;align-items:center;justify-content:space-between}
.brand{display:flex;align-items:center;gap:10px}
.brand .logo{width:34px;height:34px;border-radius:8px;background:linear-gradient(135deg,#0C447C,#185FA5);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:13px;letter-spacing:.5px}
.brand .name{font-size:15px;font-weight:600;color:var(--primary-dark)}
.brand .sub{font-size:11px;color:var(--hint)}
.sitebar .login{font-size:13px;color:var(--muted);padding:6px 14px;border:1px solid var(--line);border-radius:20px;cursor:pointer;transition:.15s}
.sitebar .login:hover{border-color:var(--primary);color:var(--primary)}

/* ---------- 大会头图 Hero ---------- */
.confhead{
  background:
    radial-gradient(1200px 500px at 85% -20%,rgba(200,162,74,.22),transparent 60%),
    linear-gradient(135deg,#0C447C 0%,#185FA5 60%,#1E6DB8 100%);
  color:#fff;position:relative;overflow:hidden;
}
.confhead::after{
  content:"";position:absolute;right:-80px;top:-80px;width:340px;height:340px;border-radius:50%;
  border:1px solid rgba(255,255,255,.12);
}
.confhead::before{
  content:"";position:absolute;right:-40px;top:-40px;width:260px;height:260px;border-radius:50%;
  border:1px solid rgba(255,255,255,.08);
}
.confhead-in{max-width:var(--maxw);margin:0 auto;padding:44px 24px 36px;position:relative;z-index:1}
.confhead .tag{display:inline-block;font-size:12px;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.28);padding:4px 14px;border-radius:20px;margin-bottom:16px;letter-spacing:.5px}
.confhead h1{font-size:30px;font-weight:700;margin-bottom:10px;letter-spacing:.5px}
.confhead .theme{font-size:17px;opacity:.95;margin-bottom:22px}
.confhead .meta{display:flex;flex-wrap:wrap;gap:12px 28px;font-size:13px;opacity:.92}
.confhead .meta b{font-weight:600;margin-right:6px}
.hero-actions{display:flex;gap:12px;margin-top:24px;flex-wrap:wrap}

/* 倒计时 */
.countdown{display:flex;gap:10px;margin-top:22px}
.cd-box{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.22);border-radius:10px;padding:10px 14px;text-align:center;min-width:64px}
.cd-box .n{font-size:24px;font-weight:700;line-height:1.1;font-variant-numeric:tabular-nums}
.cd-box .l{font-size:11px;opacity:.8;margin-top:3px}
.cd-sep{font-size:22px;font-weight:700;align-self:center;opacity:.5}

/* ---------- 导航 Tabs ---------- */
.tabs{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:100;box-shadow:0 1px 0 rgba(16,24,40,.02)}
.tabs-in{max-width:var(--maxw);margin:0 auto;padding:0 24px;display:flex;gap:2px;overflow-x:auto;scrollbar-width:none}
.tabs-in::-webkit-scrollbar{display:none}
.tab{padding:15px 17px;font-size:14px;color:var(--muted);cursor:pointer;white-space:nowrap;border-bottom:2px solid transparent;transition:.15s}
.tab:hover{color:var(--primary)}
.tab.active{color:var(--primary);border-bottom-color:var(--primary);font-weight:600}

/* ---------- 主体 ---------- */
.main{max-width:var(--maxw);margin:0 auto;padding:30px 24px 70px;min-height:60vh}
.page{display:none;animation:fadein .25s ease}
.page.active{display:block}
@keyframes fadein{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.page-title{font-size:22px;font-weight:700;margin-bottom:6px}
.page-desc{font-size:13px;color:var(--muted);margin-bottom:24px}

/* ---------- 通用组件 ---------- */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.grid{display:grid;gap:16px}
.grid.cols-2{grid-template-columns:repeat(2,1fr)}
.grid.cols-3{grid-template-columns:repeat(3,1fr)}
.grid.cols-4{grid-template-columns:repeat(4,1fr)}
.sec-title{font-size:15px;font-weight:600;margin:26px 0 14px;color:var(--text);display:flex;align-items:center;gap:8px}
.sec-title::before{content:"";width:4px;height:16px;border-radius:2px;background:var(--primary);flex:0 0 auto}
.sec-title:first-child{margin-top:0}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;font-size:14px;font-weight:600;border-radius:8px;padding:11px 26px;cursor:pointer;border:none;transition:.15s;font-family:inherit}
.btn-cta{background:var(--cta);color:#fff}
.btn-cta:hover{background:var(--cta-dark)}
.btn-ghost{background:transparent;border:1px solid rgba(255,255,255,.5);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.1)}
.btn-line{background:#fff;border:1px solid var(--line);color:var(--text)}
.btn-line:hover{border-color:var(--primary);color:var(--primary)}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-dark)}
.btn-block{width:100%}

/* 统计 */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:24px}
.stat{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px;text-align:center;box-shadow:var(--shadow)}
.stat .num{font-size:28px;font-weight:700;color:var(--primary);font-variant-numeric:tabular-nums}
.stat .lbl{font-size:12px;color:var(--muted);margin-top:4px}

/* 提示条 */
.note{background:var(--primary-light);border:1px solid #CFE2F5;color:var(--primary-dark);border-radius:8px;padding:10px 14px;font-size:13px;margin-bottom:16px}
.placeholder{color:var(--hint);font-size:12px;font-style:italic}

/* ---------- 日程 ---------- */
.day-tabs{display:flex;gap:8px;margin-bottom:18px}
.day-tab{padding:8px 20px;border-radius:20px;border:1px solid var(--line);cursor:pointer;font-size:13px;color:var(--muted);background:#fff;transition:.15s}
.day-tab:hover{border-color:var(--primary);color:var(--primary)}
.day-tab.active{background:var(--primary);color:#fff;border-color:var(--primary)}
.agenda-session-name{font-size:13px;font-weight:600;color:var(--primary);padding:10px 0 8px;display:flex;align-items:center;gap:8px}
.agenda-session-name::before{content:"";width:4px;height:14px;border-radius:2px;background:var(--primary);flex:0 0 auto}
.agenda-item{display:flex;gap:16px;padding:14px 0;border-bottom:1px dashed var(--line)}
.agenda-item:last-child{border-bottom:none}
.agenda-item .time{flex:0 0 100px;font-family:ui-monospace,Menlo,Consolas,monospace;font-size:13px;color:var(--primary);font-weight:600}
.agenda-item .body{flex:1}
.agenda-item .t{font-size:14px;font-weight:500}
.agenda-item .s{font-size:12px;color:var(--muted);margin-top:2px}
.agenda-item .type{flex:0 0 auto;font-size:11px;color:var(--primary);background:var(--primary-light);padding:2px 10px;border-radius:12px;height:fit-content;white-space:nowrap}

/* ---------- 嘉宾 ---------- */
.guest-card{display:flex;gap:14px;align-items:flex-start}
.guest-avatar{width:60px;height:60px;border-radius:50%;background:linear-gradient(135deg,#E6F1FB,#CFE2F5);color:var(--primary);display:flex;align-items:center;justify-content:center;font-size:22px;font-weight:700;flex:0 0 auto}
.guest-name{font-size:15px;font-weight:600}
.guest-title{font-size:12px;color:var(--muted);margin-top:3px;line-height:1.5}
.guest-topic{font-size:12px;color:var(--primary);margin-top:8px}

/* ---------- 生态展 ---------- */
.expo-banner{background:linear-gradient(135deg,#0C447C,#185FA5);color:#fff;border-radius:var(--radius);padding:26px;margin-bottom:20px;display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap}
.expo-banner .ex{max-width:560px}
.expo-banner h2{font-size:20px;font-weight:700;margin-bottom:8px}
.expo-banner p{font-size:13px;opacity:.9;line-height:1.7}
.expo-banner .exmeta{display:flex;flex-direction:column;gap:10px;font-size:13px}
.expo-banner .exmeta b{display:inline-block;min-width:34px;font-weight:600;opacity:.85}

.expo-layout{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}
.expo-layout-img{width:100%;height:auto;border-radius:8px;border:1px solid var(--line)}
.layout-scale{border-top:1px dashed var(--line);margin-top:14px;padding-top:12px;font-size:12px;color:var(--hint);text-align:center}

.expo-cats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.expo-cat{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow)}
.expo-cat .cn{font-size:15px;font-weight:600;margin-bottom:4px}
.expo-cat .cs{display:inline-block;font-size:11px;color:#B04A25;background:#FBE9E1;padding:2px 10px;border-radius:12px;margin-bottom:8px}
.expo-cat .cd{font-size:12px;color:var(--muted);line-height:1.6}

.expo-vendors{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.vendor-item{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px;box-shadow:var(--shadow)}
.vendor-item .vn{font-size:14px;font-weight:600;margin-bottom:6px}
.vendor-item .vi{font-size:12px;color:var(--muted);line-height:1.6}

/* ---------- 报名 ---------- */
.field{margin-bottom:18px}
.field label{display:block;font-size:13px;font-weight:500;margin-bottom:6px}
.field label .req{color:#e11d48}
.field input[type=text],.field input[type=tel],.field input[type=email],.field textarea,.field select{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:8px;font-size:14px;font-family:inherit;color:var(--text);background:#fff;transition:.15s}
.field input:focus,.field textarea:focus,.field select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(24,95,165,.12)}
.field textarea{min-height:72px;resize:vertical}
.field .hint{font-size:12px;color:var(--hint);margin-top:4px}
.radio-row{display:flex;gap:10px;flex-wrap:wrap}
.radio{display:inline-flex;align-items:center;gap:6px;padding:9px 16px;border:1px solid var(--line);border-radius:8px;cursor:pointer;font-size:13px;background:#fff;transition:.15s}
.radio input{display:none}
.radio.checked{border-color:var(--primary);background:var(--primary-light);color:var(--primary-dark);font-weight:500}
.checkbox-row{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}
.checkbox{display:flex;align-items:center;gap:8px;padding:9px 12px;border:1px solid var(--line);border-radius:8px;cursor:pointer;font-size:13px;background:#fff;transition:.15s}
.checkbox input{accent-color:var(--primary)}
.checkbox.checked{border-color:var(--primary);background:var(--primary-light)}
.checkbox:hover,.radio:hover{border-color:var(--primary)}

.success-box{text-align:center;padding:10px 0}
.success-box .check{width:64px;height:64px;border-radius:50%;background:#E1F5EE;color:#0F6E56;display:flex;align-items:center;justify-content:center;font-size:30px;margin:0 auto 14px}
.success-box h3{font-size:18px;margin-bottom:6px}
.success-box .regno{font-size:13px;color:var(--muted);margin-bottom:16px}
.qr-box{width:168px;height:168px;margin:0 auto 12px;border:1px solid var(--line);border-radius:10px;background:repeating-conic-gradient(#1f2329 0% 25%,#fff 0% 50%) 0 0/24px 24px;opacity:.9}
.qr-tip{font-size:12px;color:var(--muted)}
.summary{max-width:380px;margin:18px auto 0;text-align:left;border-top:1px dashed var(--line);padding-top:14px;font-size:13px}
.summary div{display:flex;justify-content:space-between;padding:4px 0;gap:16px}
.summary span{color:var(--muted);flex:0 0 auto}
.summary b{font-weight:500;text-align:right}

/* 报名查询 */
.signup-toggle{max-width:720px;margin-bottom:16px;display:flex;gap:0}
.signup-toggle .st-btn{flex:1;padding:11px;text-align:center;font-size:14px;font-weight:500;color:var(--muted);border:1px solid var(--line);background:#fff;cursor:pointer;transition:.15s}
.signup-toggle .st-btn:first-child{border-radius:8px 0 0 8px}
.signup-toggle .st-btn:last-child{border-radius:0 8px 8px 0}
.signup-toggle .st-btn.active{background:var(--primary);color:#fff;border-color:var(--primary);font-weight:600}

/* ---------- 合作伙伴 ---------- */
.logo-wall{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.logo-cell{height:64px;border:1px solid var(--line);border-radius:8px;display:flex;align-items:center;justify-content:center;color:var(--muted);font-size:13px;background:#fff;text-align:center;padding:0 10px;box-shadow:var(--shadow)}

/* ---------- 资料 ---------- */
.file-row{display:flex;align-items:center;justify-content:space-between;padding:14px 4px;border-bottom:1px solid var(--line)}
.file-row:last-child{border-bottom:none}
.file-name{font-size:14px}
.file-meta{font-size:12px;color:var(--hint)}
.tag-level{font-size:11px;color:#fff;background:var(--primary);padding:2px 10px;border-radius:12px;cursor:pointer}
.tag-level.support{background:var(--gold)}

/* ---------- 页脚 ---------- */
.footer{background:#fff;border-top:1px solid var(--line);margin-top:20px}
.footer-in{max-width:var(--maxw);margin:0 auto;padding:28px 24px;display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap;font-size:12px;color:var(--hint)}
.footer .f-brand{font-size:14px;font-weight:600;color:var(--primary-dark);margin-bottom:6px}
.footer .f-col{min-width:140px}
.footer .f-col .t{font-weight:600;color:var(--muted);margin-bottom:8px;font-size:13px}
.footer .f-col a{display:block;color:var(--hint);margin-bottom:5px}
.footer .f-col a:hover{color:var(--primary)}
.footer .copyright{border-top:1px solid var(--line);text-align:center;padding:16px 24px;font-size:12px;color:var(--hint)}

/* ---------- 响应式 ---------- */
@media(max-width:960px){
  .grid.cols-3,.grid.cols-4,.expo-cats{grid-template-columns:repeat(2,1fr)}
  .logo-wall{grid-template-columns:repeat(3,1fr)}
}
@media(max-width:860px){
  .grid.cols-2,.grid.cols-3,.grid.cols-4{grid-template-columns:1fr}
  .stats{grid-template-columns:repeat(2,1fr)}
  .expo-cats{grid-template-columns:repeat(2,1fr)}
  .expo-vendors{grid-template-columns:1fr}
  .checkbox-row{grid-template-columns:1fr}
  .confhead h1{font-size:24px}
  .logo-wall{grid-template-columns:repeat(2,1fr)}
  .agenda-item .time{flex:0 0 88px}
}
@media(max-width:560px){
  .main{padding:22px 16px 50px}
  .confhead-in{padding:32px 16px 26px}
  .sitebar-in,.tabs-in,.footer-in{padding-left:16px;padding-right:16px}
  .countdown{flex-wrap:wrap}
  .expo-cats{grid-template-columns:1fr}
  .stats{grid-template-columns:repeat(2,1fr)}
}