*{margin:0;padding:0;box-sizing:border-box}
:root{
  --bg:#f7f8fc;--bg-2:#eef0f7;--surface:#ffffff;--surface-2:#f4f5fa;
  --border:#e5e8ef;--border-hi:#d4d9e3;--text:#1f2437;--text-soft:#3a4055;
  --muted:#7a8095;--muted-2:#9aa0b3;--primary:#6a5ae0;--primary-hover:#5847d1;
  --primary-soft:#ede9fe;--accent:#10b981;--accent-hover:#059669;
  --danger:#dc2626;--danger-soft:#fef2f2;--warning:#f59e0b;
  --radius:12px;--radius-sm:10px;--radius-lg:14px;
  --shadow-sm:0 1px 3px rgba(30,40,80,.06);
  --shadow:0 4px 16px -6px rgba(30,40,80,.1);
  --grad:linear-gradient(135deg,#6a5ae0,#8b7df0);
  --grad-soft:linear-gradient(135deg,#f5f4ff,#eef2ff);
}
html,body{height:100%}
body{font-family:'Inter',system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--text);min-height:100vh;-webkit-font-smoothing:antialiased;overflow-x:hidden;line-height:1.5}
h1,h2,h3,h4{font-family:'Space Grotesk','Inter',sans-serif;letter-spacing:-.015em;font-weight:600}
a{color:var(--primary);text-decoration:none;transition:color .15s}
a:hover{color:var(--primary-hover)}
::selection{background:var(--primary-soft);color:var(--primary)}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:var(--bg-2)}
::-webkit-scrollbar-thumb{background:#d0d5e0;border-radius:999px;border:2px solid var(--bg-2)}

.nav{position:sticky;top:0;z-index:100;padding:12px 24px;background:rgba(255,255,255,.9);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--border)}
.nav-inner{display:flex;align-items:center;gap:20px;max-width:1200px;margin:0 auto;width:100%;justify-content:space-between}
.logo{display:flex;align-items:center;gap:9px;font-family:'Space Grotesk';font-size:17px;font-weight:700;color:var(--text);letter-spacing:-.02em;text-decoration:none;flex-shrink:0}
.logo:hover{color:var(--text)}
.logo-mark{width:30px;height:30px;border-radius:8px;background:var(--grad);display:grid;place-items:center;font-weight:800;color:#fff;font-size:13px;flex-shrink:0}
.nav-links{display:flex;gap:2px;align-items:center;flex-wrap:wrap}
.nav-links a{color:var(--muted);font-size:13px;font-weight:500;padding:7px 12px;border-radius:7px;transition:all .15s;text-decoration:none;white-space:nowrap}
.nav-links a:hover{color:var(--text);background:var(--surface-2)}
.btn-nav{background:var(--primary);color:#fff!important;padding:7px 14px!important;font-weight:600!important;border-radius:7px}
.btn-nav:hover{background:var(--primary-hover)!important;color:#fff!important}
.btn-logout{background:transparent!important;color:#dc2626!important;border:1px solid #fecaca!important}
.btn-logout:hover{background:#fef2f2!important;color:#dc2626!important}
.nav-toggle{display:none;background:transparent;border:none;font-size:22px;color:var(--text);cursor:pointer;padding:4px 8px}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;padding:10px 16px;border-radius:var(--radius-sm);border:none;cursor:pointer;font-weight:600;font-size:13.5px;font-family:inherit;transition:all .18s ease;white-space:nowrap;user-select:none;text-decoration:none;line-height:1.2}
.btn:disabled{opacity:.5;cursor:not-allowed}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover:not(:disabled){background:var(--primary-hover);color:#fff}
.btn-secondary{background:var(--surface);color:var(--text);border:1px solid var(--border-hi)}
.btn-secondary:hover:not(:disabled){background:var(--surface-2);border-color:#c0c7d4;color:var(--text)}
.btn-danger{background:var(--danger);color:#fff}
.btn-ghost{background:transparent;color:var(--muted);border:1px solid var(--border)}
.btn-ghost:hover{color:var(--text);background:var(--surface-2);border-color:var(--border-hi)}
.danger-link{color:var(--danger)!important}
.danger-link:hover{background:var(--danger-soft)!important;color:var(--danger)!important;border-color:#fecaca!important}
.btn-sm{padding:6px 11px;font-size:12px;border-radius:7px}
.btn-lg{padding:13px 22px;font-size:14.5px;border-radius:11px}
.btn-block{width:100%}

.container{max-width:1100px;margin:0 auto;padding:0 20px;width:100%}
.container-narrow{max-width:680px;margin:0 auto;padding:0 20px;width:100%}
.section{padding:36px 0}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:22px;box-shadow:var(--shadow-sm)}

.hero{padding:60px 0 20px;text-align:center}
.badge{display:inline-flex;align-items:center;gap:8px;padding:6px 13px;border-radius:999px;background:var(--surface);border:1px solid var(--border);color:var(--muted);font-size:12.5px;font-weight:500;margin-bottom:22px}
.badge .dot{width:6px;height:6px;border-radius:50%;background:var(--accent)}
.hero h1{font-size:clamp(28px,5vw,48px);line-height:1.1;margin-bottom:16px;letter-spacing:-.03em;color:var(--text)}
.hero h1 .grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{color:var(--muted);font-size:16px;max-width:580px;margin:0 auto 12px;line-height:1.6}
.hero-stats{display:flex;gap:36px;justify-content:center;margin-top:40px;flex-wrap:wrap}
.stat{text-align:center}
.stat b{font-family:'Space Grotesk';font-size:20px;display:block;color:var(--text);font-weight:600}
.stat small{color:var(--muted);font-size:12px}

.upload-box{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:10px}
.drop-zone{border:2px dashed var(--border-hi);border-radius:var(--radius);padding:36px 20px;text-align:center;cursor:pointer;transition:all .2s;display:flex;flex-direction:column;align-items:center;gap:10px;background:var(--surface-2)}
.drop-zone:hover,.drop-zone.dragover{border-color:var(--primary);background:var(--primary-soft)}
.icon-wrap{width:52px;height:52px;border-radius:12px;background:#fff;border:1px solid var(--border);display:grid;place-items:center;color:var(--primary);transition:transform .25s}
.drop-zone:hover .icon-wrap{transform:translateY(-2px)}
.drop-zone h3{font-size:15px;font-weight:600;color:var(--text)}
.drop-zone p{color:var(--muted);font-size:13px}
.drop-zone .hint{color:var(--muted-2);font-size:11.5px;margin-top:2px}
.choose-btn{display:inline-flex;padding:7px 14px;border-radius:7px;background:#fff;border:1px solid var(--border-hi);color:var(--text);font-weight:600;font-size:12px}
.file-preview{margin-top:10px;padding:12px 14px;border-radius:var(--radius);background:var(--surface-2);border:1px solid var(--border);display:flex;align-items:center;gap:11px}
.fp-icon{width:36px;height:36px;border-radius:9px;background:var(--grad-soft);display:grid;place-items:center;font-size:16px;flex-shrink:0}
.fp-info{flex:1;min-width:0}
.fp-name{font-weight:600;font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;color:var(--text)}
.fp-meta{color:var(--muted);font-size:11.5px;margin-top:2px}
.fp-remove{width:28px;height:28px;border-radius:7px;border:1px solid var(--border-hi);background:#fff;color:var(--muted);cursor:pointer;display:grid;place-items:center;transition:all .15s;font-size:11px}
.fp-remove:hover{color:var(--danger);border-color:#fecaca;background:var(--danger-soft)}
.progress-wrap{margin-top:14px;padding:14px;border-radius:var(--radius);background:var(--surface-2);border:1px solid var(--border)}
.progress-head{display:flex;justify-content:space-between;font-size:12px;color:var(--muted);margin-bottom:8px;flex-wrap:wrap;gap:6px}
.progress-head b{color:var(--text);font-weight:600}
.progress-track{height:6px;background:#e6e9f1;border-radius:999px;overflow:hidden}
.progress-fill{height:100%;width:0%;border-radius:999px;background:var(--grad);transition:width .25s ease}
.result-card{margin-top:16px;padding:18px;border-radius:var(--radius);background:#f0fdf4;border:1px solid #bbf7d0}
.result-card h3{font-size:14.5px;color:#047857;margin-bottom:6px;display:flex;align-items:center;gap:8px}
.share-input{display:flex;gap:6px;margin-top:10px;flex-wrap:wrap}
.share-input .input{flex:1;min-width:0}
.result-actions{display:flex;gap:6px;flex-wrap:wrap;margin-top:12px}
.input{flex:1;width:100%;padding:9px 12px;border-radius:8px;background:var(--surface);border:1px solid var(--border-hi);color:var(--text);font-size:13px;font-family:inherit;transition:all .15s}
.input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(106,90,224,.12)}
textarea.input{resize:vertical;min-height:60px}
select.input{cursor:pointer}

.features{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px;margin-top:44px}
.feature{padding:20px;border-radius:var(--radius-lg);background:var(--surface);border:1px solid var(--border);transition:all .2s}
.feature:hover{border-color:var(--border-hi);box-shadow:var(--shadow)}
.f-icon{width:36px;height:36px;border-radius:9px;background:var(--grad-soft);display:grid;place-items:center;color:var(--primary);margin-bottom:12px;font-size:16px}
.feature h4{font-size:14px;margin-bottom:5px;color:var(--text)}
.feature p{color:var(--muted);font-size:12.5px;line-height:1.55}

.file-list{display:flex;flex-direction:column;gap:8px}
.file-row{display:flex;align-items:center;gap:12px;padding:11px 14px;border-radius:var(--radius);background:var(--surface);border:1px solid var(--border);transition:all .15s;cursor:pointer}
.file-row:hover{border-color:var(--border-hi);box-shadow:var(--shadow-sm)}
.file-row.selected{border-color:var(--primary);background:var(--primary-soft)}
.checkbox{width:18px;height:18px;border-radius:5px;border:1.5px solid var(--border-hi);flex-shrink:0;display:grid;place-items:center;transition:all .15s;cursor:pointer;background:#fff}
.file-row.selected .checkbox,.checkbox.checked{background:var(--primary);border-color:var(--primary)}
.file-row.selected .checkbox::after,.checkbox.checked::after{content:'✓';color:#fff;font-size:11px;font-weight:700}
.fr-icon{width:34px;height:34px;border-radius:8px;background:var(--grad-soft);display:grid;place-items:center;font-size:15px;flex-shrink:0}
.fr-info{flex:1;min-width:0}
.fr-name{font-size:13px;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;color:var(--text)}
.fr-meta{color:var(--muted);font-size:11.5px;margin-top:2px}
.qs{padding:14px;border-radius:var(--radius);background:var(--surface);border:1px solid var(--border)}
.qs b{display:block;font-family:'Space Grotesk';font-size:20px;color:var(--text);font-weight:600;margin-bottom:2px}
.qs span{color:var(--muted);font-size:11px;text-transform:uppercase;letter-spacing:.05em;font-weight:500}
.alert{padding:12px 15px;border-radius:var(--radius);font-size:13px;display:flex;align-items:flex-start;gap:10px;flex-wrap:wrap}
.alert-success{background:#f0fdf4;border:1px solid #bbf7d0;color:#047857}
.alert-error{background:#fef2f2;border:1px solid #fecaca;color:#b91c1c}
.alert-warn{background:#fffbeb;border:1px solid #fde68a;color:#b45309}

footer{margin-top:60px;padding:28px 20px;text-align:center;color:var(--muted);font-size:12.5px;border-top:1px solid var(--border);background:#fff}
footer .foot-links{display:flex;gap:20px;justify-content:center;margin-bottom:10px;flex-wrap:wrap}
footer .foot-links a{color:var(--muted);font-size:12px}
footer .foot-links a:hover{color:var(--text)}

.side-card{padding:16px;border-radius:var(--radius);background:var(--surface);border:1px solid var(--border);margin-bottom:12px}
.side-card h5{font-size:11px;color:var(--muted);text-transform:uppercase;letter-spacing:.08em;margin-bottom:10px;font-weight:600}
.detail-row{display:flex;justify-content:space-between;padding:7px 0;font-size:12.5px;border-bottom:1px solid var(--border);gap:12px}
.detail-row:last-child{border-bottom:none}
.detail-row span:first-child{color:var(--muted);flex-shrink:0}
.detail-row span:last-child{font-weight:500;word-break:break-all;color:var(--text);text-align:right}

.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:12px;margin-bottom:18px}
.stat-card{padding:15px;border-radius:var(--radius);background:var(--surface);border:1px solid var(--border);position:relative}
.stat-card span{color:var(--muted);font-size:11px;text-transform:uppercase;letter-spacing:.05em;font-weight:600}
.stat-card b{display:block;font-family:'Space Grotesk';font-size:20px;color:var(--text);font-weight:600;margin:3px 0}
.stat-card .delta{position:absolute;top:12px;right:12px;font-size:11px;color:var(--accent);font-weight:600}
.bars{display:flex;align-items:flex-end;gap:5px;height:110px;padding:8px 0}
.bar{flex:1;background:var(--grad);border-radius:4px 4px 0 0;min-height:3px;position:relative}
.bar span{position:absolute;bottom:-18px;left:50%;transform:translateX(-50%);font-size:9px;color:var(--muted);white-space:nowrap}
.bar b{position:absolute;top:-18px;left:50%;transform:translateX(-50%);font-size:10px;color:var(--text);font-weight:600;opacity:0;transition:opacity .2s}
.bar:hover b{opacity:1}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.log-item{display:flex;gap:11px;padding:10px 0;border-bottom:1px solid var(--border);font-size:12.5px;align-items:center}
.log-item:last-child{border-bottom:none}
.li-icon{width:30px;height:30px;border-radius:8px;background:var(--surface-2);display:grid;place-items:center;flex-shrink:0;font-size:14px}
.rank-item{display:flex;align-items:center;gap:10px;padding:9px 10px;border-radius:var(--radius);background:var(--surface-2);font-size:12.5px;margin-bottom:5px}
.rank-item .num{width:20px;height:20px;border-radius:5px;background:var(--grad);display:grid;place-items:center;color:#fff;font-weight:700;font-size:10px;flex-shrink:0}

.hidden{display:none!important}
.flex{display:flex}
.gap-2{gap:8px}.gap-3{gap:12px}.gap-4{gap:16px}
.mt-2{margin-top:8px}.mt-3{margin-top:12px}.mt-4{margin-top:16px}.mt-6{margin-top:24px}
.text-center{text-align:center}
.muted{color:var(--muted)}
.auth-wrap{display:grid;place-items:center;min-height:100vh;padding:20px;width:100%}
.auth{max-width:400px;width:100%}
.cancel-btn{background:#fef2f2!important;color:var(--danger)!important;border:1px solid #fecaca!important}
.cancel-btn:hover{background:#fee2e2!important;color:var(--danger)!important}

@media(max-width:900px){.grid-2{grid-template-columns:1fr}}
@media(max-width:768px){
  .nav{padding:10px 16px}
  .nav-toggle{display:block}
  .nav-links{position:absolute;top:100%;left:0;right:0;background:#fff;border-bottom:1px solid var(--border);flex-direction:column;align-items:stretch;padding:10px;display:none;box-shadow:var(--shadow)}
  .nav-links.open{display:flex}
  .nav-links a{padding:10px 14px;font-size:13.5px}
  .btn-nav{text-align:center;margin-top:4px}
  .hero{padding:40px 0 20px}
  .hero-stats{gap:24px;margin-top:28px}
  .container,.container-narrow{padding:0 16px}
  .section{padding:28px 0}
  .card{padding:18px}
  .share-input{flex-direction:column}
}
@media(max-width:600px){
  .hero h1{font-size:26px}
  .hero p{font-size:14.5px}
  .file-row{flex-wrap:wrap}
  .file-row .flex.gap-2{width:100%;margin-top:6px}
  .file-row .flex.gap-2 .btn{flex:1}
}