:root{--green: #16a34a;--green-dark: #15803d;--green-soft: #163021;--green-line: #234d33;--accent-text: #7ee2a8;--bg: #0b0f0c;--bg-soft: #111712;--card: #16201a;--text: #e7f0e9;--muted: #8aa394;--border: #223427;--danger: #f87171;--shadow: 0 10px 30px rgba(0,0,0,.35);--shadow-lg: 0 14px 40px rgba(0,0,0,.45);--body-glow: #16302180;--drag-bg: #14271c;--player-bg: rgba(17,23,18,.96);--radius: 16px}[data-theme=light]{--green: #16a34a;--green-dark: #15803d;--green-soft: #e7f5ec;--green-line: #bfe4cc;--accent-text: #15803d;--bg: #f6faf7;--bg-soft: #ffffff;--card: #ffffff;--text: #15231b;--muted: #5c7366;--border: #dbe7de;--danger: #dc2626;--shadow: 0 10px 30px rgba(16,163,74,.12);--shadow-lg: 0 14px 40px rgba(16,163,74,.18);--body-glow: #d6f0e0b0;--drag-bg: #eefbf3;--player-bg: rgba(255,255,255,.96);--radius: 16px}*{box-sizing:border-box}html,body,#app{height:100%;margin:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:radial-gradient(1200px 600px at 70% -10%,var(--body-glow),transparent),var(--bg);background-attachment:fixed;color:var(--text);-webkit-font-smoothing:antialiased;transition:background .3s ease,color .3s ease}button{font-family:inherit;cursor:pointer}a{color:var(--green)}.center{max-width:980px;margin:0 auto;padding:28px 18px 120px}.app-header{display:flex;align-items:center;gap:14px;margin-bottom:6px}.app-logo{width:52px;height:52px;flex:none;display:grid;place-items:center;font-size:28px;border-radius:14px;background:linear-gradient(135deg,var(--green),#0e7a37);box-shadow:0 6px 18px #16a34a59}.app-title{margin:0;font-size:28px;letter-spacing:.3px}.app-sub{color:var(--muted);font-size:13px;margin-top:2px}.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;margin-top:18px;box-shadow:var(--shadow);transition:background .3s ease,border-color .3s ease}.card h3{margin:0 0 14px;font-size:16px;display:flex;align-items:center;gap:8px}.step-badge{width:24px;height:24px;flex:none;border-radius:8px;display:grid;place-items:center;background:var(--green-soft);color:var(--accent-text);font-size:12px;font-weight:700;border:1px solid var(--green-line)}.btn{background:var(--green);color:#fff;border:none;border-radius:10px;padding:11px 18px;font-weight:600;font-size:14px;transition:.15s;display:inline-flex;align-items:center;gap:8px;justify-content:center}.btn:hover{background:var(--green-dark);transform:translateY(-1px)}.btn:active{transform:translateY(0)}.btn:disabled{opacity:.45;cursor:not-allowed;transform:none}.btn.ghost{background:transparent;border:1px solid var(--border);color:var(--text)}.btn.ghost:hover{border-color:var(--green)}.btn.block{width:100%}.input,select{background:var(--bg-soft);border:1px solid var(--border);color:var(--text);border-radius:10px;padding:11px 12px;font-size:14px;outline:none;width:100%;transition:background .3s ease,border-color .3s ease}.input:focus,select:focus{border-color:var(--green)}.muted{color:var(--muted)}.field-label{display:block;font-size:13px;color:var(--muted);margin-bottom:6px}.dropzone{border:1.5px dashed var(--border);border-radius:14px;padding:26px 18px;text-align:center;transition:.2s;background:var(--bg-soft)}.dropzone.drag{border-color:var(--green);background:var(--drag-bg)}.dropzone .dz-icon{font-size:30px}.dropzone .dz-hint{color:var(--muted);font-size:13px;margin-top:6px}.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}.row>.grow{flex:1;min-width:160px}.tag{display:inline-block;font-size:12px;padding:4px 10px;border-radius:999px;background:var(--green-soft);color:var(--accent-text);border:1px solid var(--green-line);margin:4px 6px 0 0}.opt-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.progress{height:9px;background:var(--bg-soft);border-radius:999px;overflow:hidden;border:1px solid var(--border)}.progress>span{display:block;height:100%;background:linear-gradient(90deg,var(--green),#4ade80);transition:width .25s}.progress-wrap{margin-top:12px}.progress-meta{font-size:12px;color:var(--muted);margin-top:6px}.m4b-error{margin-top:10px;padding:12px 14px;border:1px solid var(--danger, #ef4444);border-radius:12px;background:#ef444414;color:var(--danger, #ef4444);font-size:13px}.chapter-list{max-height:380px;overflow:auto;border:1px solid var(--border);border-radius:12px}.chapter{display:flex;align-items:center;gap:10px;padding:11px 13px;border-bottom:1px solid var(--border)}.chapter:last-child{border-bottom:none}.chapter:hover{background:var(--bg-soft)}.chapter .c-title{font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.chapter .c-meta{font-size:12px;color:var(--muted)}.icon-btn{flex:none;width:38px;height:38px;border-radius:10px;display:grid;place-items:center;background:transparent;border:1px solid var(--border);color:var(--text);font-size:15px}.icon-btn:hover{border-color:var(--green)}.sticky-player{position:fixed;left:0;right:0;bottom:0;z-index:50;background:var(--player-bg);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-top:1px solid var(--border);padding:10px 16px;display:flex;align-items:center;gap:12px;transition:background .3s ease,border-color .3s ease}.sticky-player .sp-info{flex:1;min-width:0}.sticky-player .sp-title{font-size:13px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.sticky-player audio{width:280px;max-width:42vw}footer.app-footer{text-align:center;color:var(--muted);font-size:12px;margin-top:26px}@media (max-width: 640px){.center{padding:18px 14px 110px}.app-title{font-size:22px}.app-logo{width:44px;height:44px;font-size:24px}.card{padding:16px;border-radius:14px}.opt-grid{grid-template-columns:1fr}.row{gap:8px}.btn,.row .btn{width:100%}.sticky-player{flex-direction:column;align-items:stretch;gap:8px;padding:10px 12px}.sticky-player audio{width:100%;max-width:100%}.chapter .c-meta{display:none}.chapter .icon-btn{width:42px;height:42px}}@media (max-width: 380px){.app-sub{font-size:12px}}.top-bar{display:flex;align-items:center;justify-content:space-between;gap:12px}.top-actions{display:flex;align-items:center;gap:8px}.lang-toggle{white-space:nowrap;padding:8px 14px;font-weight:600;border-radius:999px}.theme-toggle{white-space:nowrap;padding:8px 12px;font-weight:600;border-radius:999px;font-size:16px;line-height:1}