:root{
  --night:#031457;
  --navy:#06267f;
  --blue:#0759d5;
  --blue-2:#0b7be8;
  --cyan:#5cb6ff;
  --cyan-2:#c6dcf3;
  --ice:#e4eaff;
  --soft:#eaeeff;
  --text:#132241;
  --muted:#63738d;
  --line:#c8dcf3;
  --card:#ffffff;
  --shadow:0 22px 60px rgba(4,45,135,.12);
  --shadow-strong:0 18px 44px rgba(1,32,107,.22);
  --radius:22px;
}
*{box-sizing:border-box}
@keyframes corner-glow{0%,100%{transform:scale(.95);opacity:.75}50%{transform:scale(1.32);opacity:1}}
@media (prefers-reduced-motion: reduce){.quick-card::after,.feature-card::after{animation:none}}
html{scroll-behavior:smooth}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei","PingFang SC","Hiragino Sans GB",Arial,sans-serif;color:var(--text);background:#ffffff;line-height:1.74}
a{color:inherit;text-decoration:none}
img{max-width:100%;height:auto;display:block}
.container{width:min(1180px,calc(100% - 40px));margin:0 auto}
.site-header{position:sticky;top:0;z-index:60;background:linear-gradient(to right, rgba(0, 7, 171, 0.97) 24.79%, rgba(0, 40, 200, 0.95));backdrop-filter:saturate(160%) blur(12px);box-shadow:0 12px 34px rgba(0,18,80,.26)}
.site-header::before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 12% 40%,rgba(82,165,240,.16),transparent 24%),radial-gradient(circle at 80% 0,rgba(49,141,255,.22),transparent 32%);pointer-events:none}
.header-inner{height:68px;display:flex;align-items:center;justify-content:space-between;gap:18px;position:relative;z-index:1}
.brand{display:flex;align-items:center;gap:12px;color:#fff;min-width:286px}
.brand img{width:46px;height:46px;border-radius:50%;background:#fff;box-shadow:0 0 0 2px rgba(255,255,255,.72),0 0 24px rgba(82,165,240,.22)}
.brand strong{display:block;font-size:18px;letter-spacing:.03em;line-height:1.05}
.brand span span{display:block;font-size:11px;color:rgba(255,255,255,.78);line-height:1.25;margin-top:4px;white-space:nowrap}
.nav{display:flex;align-items:center;justify-content:flex-end;gap:5px;flex-wrap:wrap}
.nav a{color:rgba(255,255,255,.86);font-size:14px;font-weight:760;line-height:1;padding:10px 12px;border:1px solid transparent;border-radius:999px;transition:background .2s,border-color .2s,color .2s}
.nav a:hover,.nav a.active{color:#fff;background:rgba(82,165,240,.12);border-color:rgba(82,165,240,.36)}
.nav a.external::after{content:"\2197";font-size:12px;margin-left:3px;color:var(--cyan)}
.nav-toggle{display:none;appearance:none;border:1px solid rgba(255,255,255,.36);background:rgba(255,255,255,.08);color:#fff;width:44px;height:44px;border-radius:14px;font-size:30px;line-height:1;cursor:pointer}
.home-hero{position:relative;background:linear-gradient(180deg,#03185f 0%,#063fb5 58%,#0c73df 100%);overflow:hidden}
.home-hero::before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 68% 78%,rgba(132,190,245,.35),transparent 28%),radial-gradient(circle at 28% 0,rgba(33,112,255,.30),transparent 34%);pointer-events:none}
.hero-shell{position:relative;z-index:1;width:min(2048px,100%);margin:0 auto}
.hero-shell img{width:100%;height:auto;display:block}
.home-main{position:relative;background:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='144' height='144' viewBox='0 0 144 144'><g fill='%235cb6ff' fill-opacity='.22'><circle cx='0' cy='0' r='1.5'/><circle cx='48' cy='0' r='1.5'/><circle cx='96' cy='0' r='1.5'/><circle cx='144' cy='0' r='1.5'/><circle cx='0' cy='48' r='1.5'/><circle cx='48' cy='48' r='1.5'/><circle cx='96' cy='48' r='1.5'/><circle cx='144' cy='48' r='1.5'/><circle cx='0' cy='96' r='1.5'/><circle cx='48' cy='96' r='1.5'/><circle cx='96' cy='96' r='1.5'/><circle cx='144' cy='96' r='1.5'/><circle cx='0' cy='144' r='1.5'/><circle cx='48' cy='144' r='1.5'/><circle cx='96' cy='144' r='1.5'/><circle cx='144' cy='144' r='1.5'/></g><g stroke='%235cb6ff' stroke-opacity='.18' stroke-width='.6' fill='none'><line x1='0' y1='0' x2='48' y2='0'/><line x1='96' y1='48' x2='144' y2='48'/><line x1='0' y1='96' x2='96' y2='96'/><line x1='48' y1='144' x2='144' y2='144'/><line x1='48' y1='0' x2='48' y2='48'/><line x1='96' y1='48' x2='96' y2='96'/><line x1='0' y1='96' x2='0' y2='144'/><line x1='48' y1='96' x2='48' y2='144'/><line x1='0' y1='0' x2='48' y2='48'/><line x1='96' y1='48' x2='144' y2='0'/><line x1='48' y1='96' x2='0' y2='144'/><line x1='144' y1='96' x2='96' y2='144'/></g></svg>") repeat,#ffffff;padding:0 0 64px}
.quick-panel{position:relative;z-index:3;margin-top:-28px}
.quick-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
.quick-card{background:linear-gradient(180deg,rgba(255,255,255,.94),rgba(232,238,255,.96));border:1px solid rgba(132,175,245,.72);border-radius:20px;padding:18px 20px;box-shadow:var(--shadow-strong);min-height:116px;position:relative;overflow:hidden;transition:transform .22s,box-shadow .22s,border-color .22s}
.quick-card:hover{transform:translateY(-5px);box-shadow:0 20px 48px rgba(4,56,151,.17);border-color:#8caeea}
.quick-card::after{content:"";position:absolute;right:-38px;bottom:-48px;width:120px;height:120px;border-radius:50%;background:radial-gradient(circle,rgba(82,165,240,.4),rgba(82,165,240,0) 68%);animation:corner-glow 3s ease-in-out infinite}
.quick-card:nth-child(2)::after{animation-delay:.75s}.quick-card:nth-child(3)::after{animation-delay:1.5s}.quick-card:nth-child(4)::after{animation-delay:2.25s}
.quick-card .label{display:block;color:#0960c9;font-size:12px;font-weight:900;letter-spacing:.1em;text-transform:uppercase;margin-bottom:8px}
.quick-card strong{display:block;color:#062b80;font-size:20px;line-height:1.25;margin-bottom:5px}
.quick-card span:last-child{display:block;color:var(--muted);font-size:14px}
.main{background:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='144' height='144' viewBox='0 0 144 144'><g fill='%235cb6ff' fill-opacity='.22'><circle cx='0' cy='0' r='1.5'/><circle cx='48' cy='0' r='1.5'/><circle cx='96' cy='0' r='1.5'/><circle cx='144' cy='0' r='1.5'/><circle cx='0' cy='48' r='1.5'/><circle cx='48' cy='48' r='1.5'/><circle cx='96' cy='48' r='1.5'/><circle cx='144' cy='48' r='1.5'/><circle cx='0' cy='96' r='1.5'/><circle cx='48' cy='96' r='1.5'/><circle cx='96' cy='96' r='1.5'/><circle cx='144' cy='96' r='1.5'/><circle cx='0' cy='144' r='1.5'/><circle cx='48' cy='144' r='1.5'/><circle cx='96' cy='144' r='1.5'/><circle cx='144' cy='144' r='1.5'/></g><g stroke='%235cb6ff' stroke-opacity='.18' stroke-width='.6' fill='none'><line x1='0' y1='0' x2='48' y2='0'/><line x1='96' y1='48' x2='144' y2='48'/><line x1='0' y1='96' x2='96' y2='96'/><line x1='48' y1='144' x2='144' y2='144'/><line x1='48' y1='0' x2='48' y2='48'/><line x1='96' y1='48' x2='96' y2='96'/><line x1='0' y1='96' x2='0' y2='144'/><line x1='48' y1='96' x2='48' y2='144'/><line x1='0' y1='0' x2='48' y2='48'/><line x1='96' y1='48' x2='144' y2='0'/><line x1='48' y1='96' x2='0' y2='144'/><line x1='144' y1='96' x2='96' y2='144'/></g></svg>") repeat,#ffffff;padding:42px 0 64px}
.section{margin-top:36px}
.section:first-child{margin-top:0}
.section-head{text-align:center;margin:0 auto 24px;max-width:790px}
.section-kicker{display:inline-flex;align-items:center;gap:10px;color:#0963ce;font-weight:900;font-size:14px;letter-spacing:.11em;text-transform:uppercase}
.section-kicker::before,.section-kicker::after{content:"";width:36px;height:3px;border-radius:999px;background:linear-gradient(90deg,var(--blue),var(--cyan))}
.section-title{margin:8px 0 8px;font-size:clamp(25px,2.5vw,38px);line-height:1.24;color:#062b80;letter-spacing:.01em}
.section-desc{margin:0;color:var(--muted)}
.card{background:rgba(255,255,255,.96);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:28px;position:relative;overflow:hidden}
.card::before{content:"";position:absolute;left:0;top:0;right:0;height:4px;background:linear-gradient(90deg,var(--blue),var(--cyan))}
.card + .card,.image-card + .card,.card + .image-card{margin-top:18px}
.card h2,.card h3{color:#062b80;margin-top:0;line-height:1.35}
.card h2{font-size:26px;border-bottom:1px solid var(--line);padding-bottom:12px;margin-bottom:18px}
.card h3{font-size:20px;margin-bottom:10px}
.card p{margin:0 0 12px}
.card p:last-child{margin-bottom:0}
.lead{font-size:18px;color:#173872;font-weight:650}
.muted{color:var(--muted)}
.highlight{color:#065ac6;font-weight:850}
.grid{display:grid;gap:18px}
.grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid.three{grid-template-columns:repeat(3,minmax(0,1fr))}
.feature-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;margin-top:20px}
.feature-card{position:relative;display:flex;flex-direction:column;min-height:146px;background:linear-gradient(148deg,#ffffff 0%,#dfe5ff 100%);border:1px solid #c5d1ee;border-radius:20px;padding:22px;overflow:hidden;box-shadow:0 12px 34px rgba(6,77,172,.09);transition:transform .22s,box-shadow .22s,border-color .22s}
.feature-card::before{content:"";position:absolute;left:0;top:0;right:0;height:4px;background:linear-gradient(90deg,#0b66d9,#5cb6ff)}
.feature-card::after{content:"";position:absolute;right:-7px;top:4px;width:84px;height:84px;background:var(--icon) no-repeat center/contain;pointer-events:none;z-index:0}
/* 文档（会议简介） */
.feature-card[data-icon="intro"]{--icon:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><rect x='28' y='20' width='44' height='60' rx='4' fill='none' stroke='%23075ed8' stroke-opacity='.3' stroke-width='2'/><line x1='38' y1='36' x2='62' y2='36' stroke='%23075ed8' stroke-opacity='.25' stroke-width='2'/><line x1='38' y1='50' x2='62' y2='50' stroke='%23075ed8' stroke-opacity='.25' stroke-width='2'/><line x1='38' y1='64' x2='54' y2='64' stroke='%23075ed8' stroke-opacity='.25' stroke-width='2'/></svg>")}
/* 五角星（会议亮点） */
.feature-card[data-icon="highlights"]{--icon:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><path d='M50 18 L58 40 L82 42 L63 56 L70 80 L50 66 L30 80 L37 56 L18 42 L42 40 Z' fill='%23075ed8' fill-opacity='.2' stroke='%23075ed8' stroke-opacity='.35' stroke-width='1.5' stroke-linejoin='round'/></svg>")}
/* 日历（程序概览） */
.feature-card[data-icon="program"]{--icon:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><rect x='22' y='28' width='56' height='52' rx='4' fill='none' stroke='%23075ed8' stroke-opacity='.3' stroke-width='2'/><line x1='22' y1='42' x2='78' y2='42' stroke='%23075ed8' stroke-opacity='.3' stroke-width='2'/><line x1='35' y1='20' x2='35' y2='34' stroke='%23075ed8' stroke-opacity='.3' stroke-width='2'/><line x1='65' y1='20' x2='65' y2='34' stroke='%23075ed8' stroke-opacity='.3' stroke-width='2'/><circle cx='36' cy='56' r='2' fill='%23075ed8' fill-opacity='.3'/><circle cx='50' cy='56' r='2' fill='%23075ed8' fill-opacity='.3'/><circle cx='64' cy='56' r='2' fill='%23075ed8' fill-opacity='.3'/><circle cx='36' cy='70' r='2' fill='%23075ed8' fill-opacity='.3'/><circle cx='50' cy='70' r='2' fill='%23075ed8' fill-opacity='.3'/></svg>")}
/* 写字板+对勾（会议注册） */
.feature-card[data-icon="register"]{--icon:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><rect x='28' y='22' width='44' height='58' rx='4' fill='none' stroke='%23075ed8' stroke-opacity='.3' stroke-width='2'/><rect x='40' y='14' width='20' height='14' rx='2' fill='none' stroke='%23075ed8' stroke-opacity='.3' stroke-width='2'/><path d='M36 52 L46 62 L64 42' fill='none' stroke='%23075ed8' stroke-opacity='.45' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'/></svg>")}
/* 酒店建筑 */
.feature-card[data-icon="hotel"]{--icon:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><rect x='25' y='26' width='50' height='54' fill='none' stroke='%23075ed8' stroke-opacity='.3' stroke-width='2'/><rect x='35' y='38' width='8' height='8' fill='%23075ed8' fill-opacity='.25'/><rect x='57' y='38' width='8' height='8' fill='%23075ed8' fill-opacity='.25'/><rect x='35' y='52' width='8' height='8' fill='%23075ed8' fill-opacity='.25'/><rect x='57' y='52' width='8' height='8' fill='%23075ed8' fill-opacity='.25'/><rect x='44' y='66' width='12' height='14' fill='%23075ed8' fill-opacity='.25'/></svg>")}
/* 展板+灯泡（论文墙报与快闪） */
.feature-card[data-icon="poster"]{--icon:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><rect x='28' y='20' width='44' height='52' rx='2' fill='none' stroke='%23075ed8' stroke-opacity='.3' stroke-width='2'/><line x1='50' y1='72' x2='50' y2='85' stroke='%23075ed8' stroke-opacity='.3' stroke-width='2'/><line x1='40' y1='85' x2='60' y2='85' stroke='%23075ed8' stroke-opacity='.3' stroke-width='2'/><circle cx='50' cy='40' r='7' fill='none' stroke='%23075ed8' stroke-opacity='.4' stroke-width='2'/><line x1='50' y1='50' x2='50' y2='60' stroke='%23075ed8' stroke-opacity='.35' stroke-width='2'/><line x1='46' y1='60' x2='54' y2='60' stroke='%23075ed8' stroke-opacity='.35' stroke-width='2'/></svg>")}
/* 麦克风（大会特邀报告） */
.feature-card[data-icon="invited"]{--icon:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><rect x='42' y='18' width='16' height='34' rx='8' fill='none' stroke='%23075ed8' stroke-opacity='.35' stroke-width='2'/><path d='M32 50 Q32 68 50 68 Q68 68 68 50' fill='none' stroke='%23075ed8' stroke-opacity='.35' stroke-width='2'/><line x1='50' y1='68' x2='50' y2='80' stroke='%23075ed8' stroke-opacity='.35' stroke-width='2'/><line x1='40' y1='80' x2='60' y2='80' stroke='%23075ed8' stroke-opacity='.35' stroke-width='2'/></svg>")}
/* 多人连线（大会专题报告） */
.feature-card[data-icon="session"]{--icon:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><circle cx='30' cy='38' r='7' fill='none' stroke='%23075ed8' stroke-opacity='.35' stroke-width='2'/><circle cx='70' cy='38' r='7' fill='none' stroke='%23075ed8' stroke-opacity='.35' stroke-width='2'/><circle cx='50' cy='70' r='7' fill='none' stroke='%23075ed8' stroke-opacity='.35' stroke-width='2'/><line x1='36' y1='42' x2='64' y2='42' stroke='%23075ed8' stroke-opacity='.3' stroke-width='2'/><line x1='34' y1='44' x2='46' y2='65' stroke='%23075ed8' stroke-opacity='.3' stroke-width='2'/><line x1='66' y1='44' x2='54' y2='65' stroke='%23075ed8' stroke-opacity='.3' stroke-width='2'/></svg>")}
/* 靶心+方位（战略报告） */
.feature-card[data-icon="strategy"]{--icon:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><circle cx='50' cy='50' r='28' fill='none' stroke='%23075ed8' stroke-opacity='.3' stroke-width='2'/><circle cx='50' cy='50' r='18' fill='none' stroke='%23075ed8' stroke-opacity='.3' stroke-width='2'/><circle cx='50' cy='50' r='8' fill='%23075ed8' fill-opacity='.3'/><line x1='50' y1='14' x2='50' y2='20' stroke='%23075ed8' stroke-opacity='.3' stroke-width='2'/><line x1='50' y1='80' x2='50' y2='86' stroke='%23075ed8' stroke-opacity='.3' stroke-width='2'/><line x1='14' y1='50' x2='20' y2='50' stroke='%23075ed8' stroke-opacity='.3' stroke-width='2'/><line x1='80' y1='50' x2='86' y2='50' stroke='%23075ed8' stroke-opacity='.3' stroke-width='2'/></svg>")}
/* 翻开的书（前沿讲习班） */
.feature-card[data-icon="tutorial"]{--icon:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><path d='M22 30 L50 24 L50 78 L22 84 Z' fill='none' stroke='%23075ed8' stroke-opacity='.35' stroke-width='2'/><path d='M78 30 L50 24 L50 78 L78 84 Z' fill='none' stroke='%23075ed8' stroke-opacity='.35' stroke-width='2'/><line x1='50' y1='24' x2='50' y2='78' stroke='%23075ed8' stroke-opacity='.35' stroke-width='2'/></svg>")}
/* 圆桌+人（圆桌论坛） */
.feature-card[data-icon="roundtable"]{--icon:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><ellipse cx='50' cy='52' rx='24' ry='12' fill='none' stroke='%23075ed8' stroke-opacity='.35' stroke-width='2'/><circle cx='30' cy='32' r='4' fill='%23075ed8' fill-opacity='.3'/><circle cx='50' cy='26' r='4' fill='%23075ed8' fill-opacity='.3'/><circle cx='70' cy='32' r='4' fill='%23075ed8' fill-opacity='.3'/><circle cx='28' cy='74' r='4' fill='%23075ed8' fill-opacity='.3'/><circle cx='72' cy='74' r='4' fill='%23075ed8' fill-opacity='.3'/></svg>")}
/* 星芒（新星论坛） */
.feature-card[data-icon="new-star"]{--icon:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><path d='M50 22 L56 44 L78 46 L60 58 L66 80 L50 68 L34 80 L40 58 L22 46 L44 44 Z' fill='%23075ed8' fill-opacity='.22' stroke='%23075ed8' stroke-opacity='.4' stroke-width='1.5' stroke-linejoin='round'/><line x1='50' y1='8' x2='50' y2='14' stroke='%23075ed8' stroke-opacity='.3' stroke-width='2'/><line x1='50' y1='86' x2='50' y2='92' stroke='%23075ed8' stroke-opacity='.3' stroke-width='2'/></svg>")}
/* 奖杯（社会计算创新大赛） */
.feature-card[data-icon="contest"]{--icon:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><path d='M34 22 L66 22 L62 50 Q60 60 50 60 Q40 60 38 50 Z' fill='none' stroke='%23075ed8' stroke-opacity='.35' stroke-width='2'/><path d='M34 28 Q22 28 22 42 Q22 50 30 52' fill='none' stroke='%23075ed8' stroke-opacity='.35' stroke-width='2'/><path d='M66 28 Q78 28 78 42 Q78 50 70 52' fill='none' stroke='%23075ed8' stroke-opacity='.35' stroke-width='2'/><line x1='50' y1='60' x2='50' y2='74' stroke='%23075ed8' stroke-opacity='.35' stroke-width='2'/><rect x='38' y='74' width='24' height='8' rx='1' fill='%23075ed8' fill-opacity='.3'/></svg>")}
/* 定位针（会场交通） */
.feature-card[data-icon="traffic"]{--icon:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><path d='M50 14 Q70 14 70 38 Q70 58 50 86 Q30 58 30 38 Q30 14 50 14 Z' fill='none' stroke='%23075ed8' stroke-opacity='.35' stroke-width='2'/><circle cx='50' cy='36' r='8' fill='%23075ed8' fill-opacity='.28'/></svg>")}
/* 人群（会议组织委员会） */
.feature-card[data-icon="committee"]{--icon:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><circle cx='50' cy='30' r='9' fill='none' stroke='%23075ed8' stroke-opacity='.35' stroke-width='2'/><circle cx='28' cy='46' r='7' fill='none' stroke='%23075ed8' stroke-opacity='.35' stroke-width='2'/><circle cx='72' cy='46' r='7' fill='none' stroke='%23075ed8' stroke-opacity='.35' stroke-width='2'/><path d='M32 80 Q32 62 50 62 Q68 62 68 80' fill='none' stroke='%23075ed8' stroke-opacity='.35' stroke-width='2'/><path d='M18 80 Q18 68 28 68' fill='none' stroke='%23075ed8' stroke-opacity='.35' stroke-width='2'/><path d='M82 80 Q82 68 72 68' fill='none' stroke='%23075ed8' stroke-opacity='.35' stroke-width='2'/></svg>")}
/* 信封（会务联络） */
.feature-card[data-icon="contact"]{--icon:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><rect x='20' y='30' width='60' height='40' rx='3' fill='none' stroke='%23075ed8' stroke-opacity='.35' stroke-width='2'/><path d='M20 32 L50 54 L80 32' fill='none' stroke='%23075ed8' stroke-opacity='.35' stroke-width='2'/></svg>")}
/* 相机（照片直播） */
.feature-card[data-icon="photo"]{--icon:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><rect x='16' y='32' width='68' height='44' rx='5' fill='none' stroke='%23075ed8' stroke-opacity='.35' stroke-width='2'/><rect x='36' y='22' width='18' height='12' rx='2' fill='none' stroke='%23075ed8' stroke-opacity='.35' stroke-width='2'/><circle cx='50' cy='54' r='11' fill='none' stroke='%23075ed8' stroke-opacity='.35' stroke-width='2'/><circle cx='50' cy='54' r='5' fill='%23075ed8' fill-opacity='.3'/><circle cx='72' cy='40' r='2' fill='%23075ed8' fill-opacity='.35'/></svg>")}
/* 书+书签（电子会议手册） */
.feature-card[data-icon="manual"]{--icon:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><rect x='25' y='20' width='50' height='60' rx='3' fill='none' stroke='%23075ed8' stroke-opacity='.35' stroke-width='2'/><line x1='35' y1='36' x2='65' y2='36' stroke='%23075ed8' stroke-opacity='.25' stroke-width='2'/><line x1='35' y1='50' x2='65' y2='50' stroke='%23075ed8' stroke-opacity='.25' stroke-width='2'/><line x1='35' y1='64' x2='55' y2='64' stroke='%23075ed8' stroke-opacity='.25' stroke-width='2'/><path d='M68 20 L68 38 L76 32 Z' fill='%23075ed8' fill-opacity='.3'/></svg>")}
/* 柱状图（中国人工智能发展报告） */
.feature-card[data-icon="dev-report"]{--icon:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><line x1='20' y1='80' x2='80' y2='80' stroke='%23075ed8' stroke-opacity='.35' stroke-width='2'/><line x1='20' y1='20' x2='20' y2='80' stroke='%23075ed8' stroke-opacity='.35' stroke-width='2'/><rect x='30' y='56' width='10' height='24' fill='%23075ed8' fill-opacity='.25'/><rect x='45' y='40' width='10' height='40' fill='%23075ed8' fill-opacity='.28'/><rect x='60' y='28' width='10' height='52' fill='%23075ed8' fill-opacity='.32'/></svg>")}
/* 用户头像（个人中心） */
.feature-card[data-icon="center"]{--icon:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><circle cx='50' cy='36' r='14' fill='none' stroke='%23075ed8' stroke-opacity='.35' stroke-width='2'/><path d='M22 84 Q22 60 50 60 Q78 60 78 84' fill='none' stroke='%23075ed8' stroke-opacity='.35' stroke-width='2' stroke-linecap='round'/></svg>")}
.feature-card .tag{position:relative;z-index:1}
.feature-card:hover{transform:translateY(-5px);box-shadow:0 20px 48px rgba(4,56,151,.17);border-color:#8caeea}
.feature-card .tag{font-size:12px;font-weight:900;color:#075cc7;letter-spacing:.09em;text-transform:uppercase;margin-bottom:8px}
.feature-card strong{font-size:19px;color:#082c7b;line-height:1.35;margin-bottom:8px;position:relative;z-index:1}
.feature-card span{font-size:14px;color:var(--muted);position:relative;z-index:1}
.feature-card.external strong::after{content:" \2197";color:#0b77e2;font-size:.84em}
.button-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:18px}
.button-row.stack{flex-direction:column;align-items:flex-start;gap:8px;margin-top:14px}
.button-row.stack .btn{min-height:34px;padding:6px 14px;font-size:13px}
.btn:disabled{opacity:.6;cursor:not-allowed;transform:none;box-shadow:none}
.route-result{margin-top:14px;padding:10px 14px;background:rgba(7,94,216,.08);border-left:3px solid #075cc7;border-radius:8px;font-size:14px;color:#173872;line-height:1.65}
.route-result strong{color:#062b80}
.route-result a{color:#075cc7;font-weight:700;margin-left:4px}
.route-result a:hover{text-decoration:underline}
.route-result.loading{color:#63738d;font-style:italic;border-left-color:#c8dcf3;background:rgba(7,94,216,.04)}
.route-result code{background:rgba(7,94,216,.1);padding:1px 6px;border-radius:4px;font-size:12px;color:#062b80}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:10px 18px;border-radius:999px;background:linear-gradient(135deg,#075ed8,#07329a);color:#fff;font-weight:850;border:0;box-shadow:0 10px 24px rgba(0,94,216,.24);transition:transform .2s,box-shadow .2s}
.btn:hover{transform:translateY(-2px);box-shadow:0 15px 32px rgba(0,94,216,.30)}
.btn.secondary{background:#fff;color:#075cc7;border:1px solid #abc4ed;box-shadow:none}
.btn.ghost{background:rgba(7,94,216,.08);color:#075cc7;border:1px solid rgba(7,94,216,.18);box-shadow:none}
.btn.external::after{content:"\2197";font-size:13px}
.image-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:12px;box-shadow:0 12px 34px rgba(6,77,172,.08)}
.image-card img{border-radius:12px;margin:0 auto;max-width:560px;width:100%;display:block}
.image-card.poster img{max-width:750px}
.card > .poster-img,.keynote-poster > img{display:block;width:100%;height:auto;max-width:750px;margin-left:auto;margin-right:auto;border-radius:14px}
.card > .poster-img + .caption{margin-top:12px;text-align:center}
.card > img{display:block;width:100%;height:auto;max-width:560px;margin-left:auto;margin-right:auto;border-radius:12px}
.card > img + .caption{margin-top:12px;text-align:center}
.keynote-poster{margin:0 auto;text-align:center}
.keynote-poster > img{box-shadow:0 18px 44px rgba(4,45,135,.16)}
.caption{font-size:13px;color:var(--muted);text-align:center;margin-top:8px}
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:16px;background:#fff;margin-top:14px}
table{width:100%;border-collapse:collapse;min-width:640px;background:#fff}
th,td{padding:12px 14px;border-bottom:1px solid #d4dcec;text-align:left;vertical-align:top}
th{background:#d6deef;color:#062b80;font-weight:900;white-space:nowrap}
tr:last-child td{border-bottom:0}.day-row th{background:linear-gradient(90deg,#c8d4ec,#dfe5ff);color:#073077;text-align:center;font-size:18px;letter-spacing:.05em}
.notice{border-left:5px solid #0870dc;background:linear-gradient(90deg,#dde4ff,#eef2ff);padding:16px 18px;border-radius:14px;color:#17356c;margin:14px 0}
.timeline{display:grid;gap:14px}
.timeline-item{display:grid;grid-template-columns:235px 1fr;gap:18px;padding:18px;border:1px solid var(--line);border-radius:18px;background:linear-gradient(180deg,#fff,#e8ecff)}
.timeline-item>.button-row{grid-column:1/-1;margin-top:4px}
.timeline-item>.route-result{grid-column:1/-1;margin-top:8px}
.timeline-item b{display:block;color:#075cc7;margin-bottom:8px}.timeline-item p{margin:0;color:var(--muted)}
.stat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:18px 0}.stat{padding:18px;border-radius:16px;background:#e4eaff;border:1px solid var(--line);text-align:center}.stat strong{display:block;font-size:24px;color:#062b80;line-height:1.1;margin-bottom:6px}.stat span{color:var(--muted);font-size:14px}
.committee-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.committee-card{padding:18px;border:1px solid var(--line);border-radius:16px;background:linear-gradient(180deg,#fff,#e8ecff)}.committee-card h3{font-size:18px;margin:0 0 8px;color:#075cc7}.committee-card p{margin:4px 0;color:#20345d}
.speaker-card{padding:22px 24px;border:1px solid var(--line);border-radius:18px;background:linear-gradient(180deg,#fff,#eef1ff);margin-bottom:18px;box-shadow:0 12px 30px rgba(6,77,172,.07);display:flex;gap:22px;align-items:flex-start}.speaker-card:last-child{margin-bottom:0}.speaker-card h3{margin:0 0 6px;color:#062b80;font-size:22px}.speaker-card h4{margin:14px 0 8px;color:#075cc7;font-size:17px;line-height:1.45}.speaker-card p{margin:0 0 12px;color:#20345d}.speaker-card p:last-child{margin-bottom:0}.speaker-affil{margin:0 0 10px;color:#20345d;font-size:15px}.speaker-portrait{width:140px;min-width:140px;height:140px;border-radius:50%;object-fit:cover;border:3px solid #e4eaff;box-shadow:0 8px 22px rgba(6,77,172,.12);flex-shrink:0}.speaker-body{flex:1;min-width:0}.chair-portrait{width:140px;height:140px;border-radius:50%;object-fit:cover;border:3px solid #e4eaff;box-shadow:0 8px 22px rgba(6,77,172,.12);margin:0 auto 14px;display:block}
@media(max-width:560px){.speaker-card{flex-direction:column;align-items:center;text-align:center}.speaker-portrait{width:120px;min-width:120px;height:120px}.speaker-body{text-align:left}}
.contact-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.contact-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:20px;box-shadow:0 12px 30px rgba(6,77,172,.08)}.contact-card h3{margin:0 0 10px;color:#075cc7}.contact-card p{margin:5px 0}
.qr-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;align-items:start}.qr-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:18px;text-align:center;box-shadow:0 12px 30px rgba(6,77,172,.08)}.qr-card img{max-width:330px;margin:0 auto;border-radius:12px}.qr-card h3{margin:10px 0 4px;color:#062b80}
.placeholder{display:grid;place-items:center;text-align:center;min-height:340px;border:1px dashed #80abea;border-radius:24px;background:radial-gradient(circle at 50% 0,rgba(82,165,240,.22),transparent 36%),linear-gradient(145deg,#dfe5ff,#fff);padding:36px;position:relative;overflow:hidden}.placeholder::before{content:"BDSC 2026";position:absolute;right:24px;bottom:10px;font-size:clamp(38px,8vw,96px);font-weight:900;color:rgba(7,94,216,.055);letter-spacing:.06em;line-height:1}.placeholder strong{font-size:32px;color:#062b80;display:block;margin-bottom:8px;position:relative}.placeholder p{color:var(--muted);max-width:620px;margin:0 auto 18px;position:relative}
.breadcrumb{font-size:14px;color:var(--muted);margin:0 0 18px}.breadcrumb a{color:#075cc7;font-weight:780}
.page-hero{background:linear-gradient(132deg, #0023b1, #002fcb 55%, #0a76dd);color:#fff;padding:58px 0 60px;position:relative;overflow:hidden}.page-hero::before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 28% 18%,rgba(82,165,240,.24),transparent 28%),radial-gradient(circle at 80% 88%,rgba(170,210,245,.30),transparent 32%)}.page-hero::after{content:"BDSC 2026";position:absolute;right:8%;bottom:-10px;font-size:72px;line-height:1;font-weight:900;color:rgba(255,255,255,.06);letter-spacing:.08em}.page-hero h1{margin:0;font-size:clamp(28px,3vw,44px);line-height:1.2;position:relative;z-index:1}.page-hero p{margin:10px 0 0;max-width:820px;color:rgba(255,255,255,.88);position:relative;z-index:1}
.footer{position:relative;background:linear-gradient(135deg,#031457,#062b87);color:rgba(255,255,255,.84);padding:34px 0;margin-top:0;border-top:1px solid rgba(82,165,240,.22)}.footer::before{content:"";position:absolute;bottom:100%;left:0;right:0;height:34px;background:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1200 34' preserveAspectRatio='none'><path d='M0,17 L120,17 L140,9 L160,25 L180,17 L320,17 L340,5 L360,29 L380,17 L560,17 L580,12 L600,22 L620,17 L820,17 L840,7 L860,27 L880,17 L1040,17 L1060,14 L1080,20 L1100,17 L1200,17' fill='none' stroke='%235cb6ff' stroke-width='1.4' stroke-opacity='.6'/></svg>") no-repeat center/100% 100%;pointer-events:none}.footer-inner{display:flex;justify-content:space-between;gap:30px;align-items:flex-start}.footer h2{margin:0 0 10px;color:#fff;font-size:20px}.footer p{margin:4px 0;font-size:14px}.footer-links{display:flex;flex-wrap:wrap;gap:10px;justify-content:flex-end;max-width:560px}.footer-links a{font-size:13px;padding:6px 10px;border:1px solid rgba(255,255,255,.16);border-radius:999px;color:rgba(255,255,255,.82)}.footer-links a:hover{background:rgba(255,255,255,.08);color:#fff}.footer-links a.external::after{content:"\2197";font-size:11px;margin-left:2px;color:var(--cyan)}
.back-top{position:fixed;right:18px;bottom:18px;width:42px;height:42px;border-radius:50%;border:0;background:#075ed8;color:#fff;font-weight:900;box-shadow:0 10px 24px rgba(0,0,0,.18);cursor:pointer;display:none}.back-top.show{display:block}
.slide-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin-top:14px}
.slide-card{background:#fff;border:1px solid var(--line);border-radius:18px;overflow:hidden;box-shadow:0 12px 30px rgba(6,77,172,.08);display:flex;flex-direction:column}
.slide-card a.image-link{display:block;line-height:0}
.slide-card a.image-link img{transition:transform .25s,box-shadow .25s}
.slide-card a.image-link:hover img{transform:scale(1.02);box-shadow:0 12px 28px rgba(7,94,216,.18)}
.slide-card img{width:100%;height:auto;display:block;border-bottom:1px solid var(--line)}
.slide-info{padding:14px 16px 16px}
.slide-info strong{display:block;color:#062b80;font-size:18px;margin-bottom:6px}
.slide-info .muted{color:var(--muted);font-size:14px;line-height:1.55;margin:0}
.keynote-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;margin-top:14px}
@media(max-width:860px){.keynote-grid{grid-template-columns:1fr}}
.special-stack{display:flex;flex-direction:column;gap:18px;margin-top:18px}
.special-stack img{width:100%;max-width:560px;height:auto;display:block;margin:0 auto;border-radius:14px;box-shadow:0 12px 30px rgba(6,77,172,.10)}
.topic-list{display:flex;flex-direction:column;gap:12px;margin-top:18px}
.topic-row{display:grid;grid-template-columns:90px 1fr auto auto;align-items:center;gap:14px;padding:18px 22px;background:#fff;border:1px solid var(--line);border-radius:16px;color:inherit;text-decoration:none;box-shadow:0 8px 22px rgba(6,77,172,.06);transition:transform .2s,box-shadow .2s,border-color .2s}
.topic-row:hover{transform:translateY(-3px);box-shadow:0 16px 34px rgba(4,56,151,.14);border-color:#8caeea}
.topic-num{font-size:14px;font-weight:900;color:#075cc7;letter-spacing:.05em;background:rgba(7,94,216,.10);padding:6px 12px;border-radius:999px;text-align:center;white-space:nowrap}
.topic-title{font-size:18px;color:#062b80;font-weight:760;line-height:1.4}
.topic-time{font-size:14px;font-weight:700;color:#075cc7;background:rgba(7,94,216,.08);padding:6px 12px;border-radius:8px;white-space:nowrap;letter-spacing:.02em}
.topic-arrow{color:#0b77e2;font-size:22px;font-weight:900;line-height:1}
@media(max-width:540px){.topic-row{grid-template-columns:90px 1fr;gap:8px;padding:14px 16px}.topic-row .topic-arrow{display:none}.topic-title{font-size:16px}.topic-time{grid-column:2;justify-self:start;padding:4px 10px;font-size:13px}}
.committee-card .portrait{width:100%;max-width:160px;height:160px;object-fit:cover;border-radius:50%;margin:0 auto 12px;display:block;border:3px solid #e4eaff}
.committee-card h4{margin:0 0 8px;color:#075cc7;font-size:17px}
@media(max-width:860px){.slide-grid{grid-template-columns:1fr}}
@media(max-width:1120px){.feature-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.quick-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:860px){.container{width:min(1180px,calc(100% - 28px))}.header-inner{height:64px}.brand{min-width:0}.brand img{width:42px;height:42px}.brand strong{font-size:16px}.brand span span{display:none}.nav-toggle{display:block}.nav{position:absolute;left:14px;right:14px;top:72px;display:none;flex-direction:column;align-items:stretch;background:linear-gradient(to right, rgb(0, 40, 200) 15.13%, rgba(2, 38, 157, 0.85) 92.02%);border:1px solid rgba(82,165,240,.24);border-radius:18px;padding:12px;box-shadow:0 18px 40px rgba(0,0,0,.26)}.nav.open{display:flex}.nav a{padding:13px 14px;border-radius:12px}.quick-panel{margin-top:0;padding-top:14px}.feature-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.grid.two,.grid.three,.committee-grid,.contact-grid,.qr-grid{grid-template-columns:1fr}.timeline-item{grid-template-columns:1fr;gap:8px}.footer-inner{display:block}.footer-links{justify-content:flex-start;margin-top:18px}.page-hero{padding:44px 0 46px}}
@media(max-width:540px){body{line-height:1.7}.container{width:min(1180px,calc(100% - 22px))}.main{padding:30px 0 48px}.quick-grid,.feature-grid,.stat-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.quick-card{min-height:auto;padding:16px 18px}.card{padding:20px;border-radius:18px}.card h2{font-size:23px}.page-hero{padding:38px 0 40px}.button-row .btn{width:100%}.qr-card img{max-width:100%}.section-head{text-align:left}.section-kicker::before{display:none}.section-title{font-size:25px}.page-hero::after{font-size:44px;right:4%;bottom:-4px}.brand strong{letter-spacing:0}.hero-shell img{min-height:auto}.contact-card,.committee-card{padding:16px}.table-wrap{margin-left:-2px;margin-right:-2px}}