:root{--bg:#0b0d10;--card:#12161b;--txt:#e9eef5;--muted:#a9b3c1;--line:#253040;--btn:#1f6feb;--danger:#d64545;}
*{box-sizing:border-box}
body{margin:0;background:#0b0d10;color:var(--txt);font-family:system-ui,Segoe UI,Arial,sans-serif}
a{color:var(--txt)}
.wrap{max-width:1100px;margin:24px auto;padding:0 16px}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:16px;margin:12px 0;box-shadow:0 8px 24px rgba(0,0,0,.25)}
h1{margin:0 0 10px 0;font-size:26px}
h2{margin:0 0 10px 0;font-size:20px}
h3{margin:10px 0;font-size:16px}
label{display:block;margin:10px 0 6px;color:var(--muted);font-size:13px}
input,textarea,select{width:100%;border-radius:12px;border:1px solid var(--line);background:#0f1318;color:var(--txt);padding:10px}
textarea{resize:vertical}
.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.row.between{justify-content:space-between}
.grow{flex:1}
hr{border:none;border-top:1px solid var(--line);margin:14px 0}
.muted{color:var(--muted)}
.small{font-size:12px}
.ok{color:#44d17b}
.warn{color:#ffd166}
.btn{background:var(--btn);border:1px solid transparent;color:white;border-radius:12px;padding:10px 12px;cursor:pointer;text-decoration:none;display:inline-block}
.btn.small{padding:7px 10px;font-size:12px;border-radius:10px}
.btn.ghost{background:transparent;border:1px solid var(--line);color:var(--txt)}
.btn.danger{background:var(--danger)}
.link{color:#bcd7ff;text-decoration:underline}
.topbar{position:sticky;top:0;background:rgba(11,13,16,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);z-index:20}
.topbar-inner{max-width:1100px;margin:0 auto;padding:10px 16px;display:flex;align-items:center;justify-content:space-between}
.brand{font-weight:700}
.grid2{display:grid;grid-template-columns:1fr;gap:12px}
.grid3{display:grid;grid-template-columns:1fr;gap:12px}
@media(min-width:900px){.grid2{grid-template-columns:1fr 1fr}.grid3{grid-template-columns:repeat(3,1fr)}}
.list{display:flex;flex-direction:column;gap:10px}
.item{display:flex;justify-content:space-between;gap:10px;padding:10px;border:1px solid var(--line);border-radius:12px;background:#0f1318}
.item.claimed{opacity:.95}
.item-title{font-weight:650}
.item-sub{color:var(--muted);font-size:12px}
.qr-card{border:1px solid var(--line);border-radius:14px;padding:12px;background:#0f1318}
.qr{width:180px;height:180px;background:#0b0d10;border-radius:12px;display:flex;align-items:center;justify-content:center;overflow:hidden}
.qr canvas{width:180px!important;height:180px!important}
.qr-title{font-weight:700;margin-top:10px}
.qr-link{font-size:12px;word-break:break-all;margin-top:6px}
.qr-members{font-size:12px;color:var(--muted);margin-top:6px}
.rules{white-space:pre-wrap;line-height:1.35}
.fileline{margin-top:8px;color:var(--muted);font-size:12px}
.present{height:100vh;display:flex;flex-direction:column}
.present-top{display:flex;justify-content:space-between;align-items:center;padding:12px 14px;border-bottom:1px solid var(--line);background:#0b0d10}
.present-title{font-weight:750}
.slide{flex:1;display:flex;align-items:stretch;justify-content:center;padding:18px}
.slide-inner{width:min(1200px,98vw);background:var(--card);border:1px solid var(--line);border-radius:18px;padding:22px;display:flex;gap:18px;position:relative}
.slide-title{font-size:34px;font-weight:800;margin:0 0 14px 0}
.slide-text{font-size:24px;line-height:1.25;white-space:pre-wrap}
.slide-imgwrap{flex:0 0 42%;display:flex;align-items:center;justify-content:center;background:#0b0d10;border:1px dashed #2b3b52;border-radius:14px;overflow:hidden}
.slide-imgwrap img,.slide-imgwrap iframe,.slide-imgwrap video{max-width:100%;max-height:100%}
.slide-main{flex:1;min-width:0}
.thumbs{position:absolute;top:56px;right:12px;left:12px;bottom:12px;background:rgba(11,13,16,.96);border:1px solid var(--line);border-radius:18px;padding:12px;overflow:auto}
.thumbs.hidden{display:none}
.thumb{border:1px solid var(--line);border-radius:14px;padding:10px;margin:10px 0;background:#0f1318;cursor:pointer}
.thumb b{display:block}
.viewer{margin-top:12px}
.viewer-img{max-width:100%;border-radius:14px;cursor:zoom-in}
.viewer-frame{width:100%;height:80vh;border:1px solid var(--line);border-radius:14px;background:#0b0d10}
.viewer-video{width:100%;max-height:80vh;border-radius:14px}