:root{--bg: #f5f7fa;--card: #ffffff;--primary: #2563eb;--primary-hover: #1d4ed8;--text: #0f172a;--muted: #475569;--border: #e2e8f0;--danger: #dc2626;--success: #16a34a;--rank-1: #d97706;--rank-2: #64748b;--rank-3: #b45309;--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-6: 24px;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang TC,Microsoft JhengHei,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);min-height:100vh}#root{max-width:920px;margin:0 auto;padding:24px 16px 64px}header.app-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:32px;padding-bottom:16px;border-bottom:1px solid var(--border)}header.app-header h1{font-size:24px;margin:0}nav.app-nav a{margin-left:16px;color:var(--muted);text-decoration:none;font-weight:500}nav.app-nav a:hover{color:var(--primary)}nav.app-nav a.active{color:var(--primary);border-bottom:2px solid var(--primary);padding-bottom:2px}.card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:20px}button{background:var(--primary);color:#fff;border:0;border-radius:8px;padding:10px 18px;font-size:16px;cursor:pointer}button:hover:not(:disabled){background:var(--primary-hover)}button:disabled{opacity:.5;cursor:not-allowed}.btn-ghost{background:transparent;color:var(--primary);border:1px solid var(--border)}.btn-ghost:hover:not(:disabled){background:var(--bg)}.btn-toggle{background:transparent;color:var(--text);border:1px solid var(--border)}.btn-toggle[aria-pressed=true]{background:var(--primary);color:#fff;border-color:var(--primary)}.btn-danger{background:var(--danger);color:#fff}.btn-danger:hover:not(:disabled){background:#b91c1c}.btn-text{background:transparent;color:var(--muted);padding:4px 12px;font-size:14px}.btn-text:hover:not(:disabled){background:var(--bg);color:var(--text)}select,input[type=file]{width:100%;padding:10px 12px;font-size:16px;border:1px solid var(--border);border-radius:8px;font-family:inherit;background:var(--card);color:var(--text)}input[type=file]{padding:8px 12px}input[type=text],textarea{width:100%;padding:10px 12px;font-size:16px;border:1px solid var(--border);border-radius:8px;font-family:inherit}textarea{min-height:160px;resize:vertical}.battle-arena{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:24px}.battle-arena .submission-card{display:flex;flex-direction:column;gap:12px;background:var(--card);color:var(--text);transition:border-color .15s,box-shadow .15s}.submission-content{flex:1;min-height:240px;display:flex;align-items:center;justify-content:center;text-align:center;font-size:20px;white-space:pre-wrap;word-break:break-word;overflow:auto}.submission-content .submission-media{max-width:100%;max-height:240px}.submission-content .submission-audio{width:100%}.submission-card.is-selected{border-color:var(--primary);box-shadow:0 0 0 3px #2563eb40}.vote-btn{width:100%}.btn-detail{align-self:center;padding:6px 14px;font-size:14px}.ranking-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:12px}.ranking-row{display:flex;align-items:center;gap:16px}.ranking-row .rank-badge{background:var(--primary);color:#fff;width:32px;height:32px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;font-weight:600;flex-shrink:0}.ranking-row.rank-1 .rank-badge{background:var(--rank-1);width:38px;height:38px;box-shadow:0 0 0 3px #d9770633}.ranking-row.rank-2 .rank-badge{background:var(--rank-2);width:36px;height:36px}.ranking-row.rank-3 .rank-badge{background:var(--rank-3);width:36px;height:36px}.ranking-row .stats{margin-left:auto;color:var(--muted);font-size:14px;white-space:nowrap}.ranking-entry-body{min-width:0;overflow:hidden}.ranking-row .submission-media{max-height:120px;max-width:100%;border-radius:6px}.ranking-row .submission-audio{width:260px;max-width:100%}.type-badge{display:inline-block;padding:2px 10px;border-radius:999px;background:var(--bg);border:1px solid var(--border);color:var(--muted);font-size:13px;font-weight:600}@media(max-width:600px){.battle-arena{grid-template-columns:1fr}.submission-content{min-height:180px}}.spinner{display:flex;align-items:center;gap:10px;padding:var(--space-6) 0}.spinner-dot{width:16px;height:16px;border:3px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.empty-state-icon{font-size:40px;margin-bottom:var(--space-2)}:focus-visible{outline:2px solid var(--primary);outline-offset:2px}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}.error-msg{color:var(--danger);font-size:14px;margin-top:8px}.empty-state{text-align:center;padding:32px 16px;color:var(--muted)}.muted{color:var(--muted);font-size:14px}.form-row{display:flex;flex-direction:column;gap:8px;margin-bottom:16px}.form-row label{font-weight:600}.host-section{margin-bottom:var(--space-4)}.btn-row{display:flex;gap:var(--space-3);flex-wrap:wrap}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#0f172a8c;display:flex;align-items:center;justify-content:center;padding:16px;z-index:100}.modal{background:var(--card);border-radius:12px;padding:16px;max-width:720px;width:100%;max-height:90vh;overflow:auto}.modal-close{display:block;margin-left:auto}.modal-body{margin-top:8px}.modal-body img,.modal-body video{max-width:100%;max-height:70vh}.modal-caption{margin-top:12px}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.drop-zone{border:2px dashed var(--border);border-radius:10px;padding:24px 16px;text-align:center;color:var(--muted);background:var(--bg);cursor:pointer;transition:border-color .15s,background .15s}.drop-zone:hover,.drop-zone:focus-visible{border-color:var(--primary)}.drop-zone.is-dragging{border-color:var(--primary);background:#2563eb14;color:var(--text)}.drop-zone.has-file{cursor:default;border-style:solid;background:var(--card)}.drop-empty{display:flex;flex-direction:column;gap:6px;align-items:center}.drop-icon{font-size:28px;line-height:1}.drop-filled{display:flex;flex-direction:column;gap:10px;align-items:center}.drop-preview{max-height:220px;max-width:100%;width:auto;object-fit:contain;border-radius:8px}