:root{--bg-app:#f4f6f9;--bg-rail:#fff;--bg-panel:#fff;--bg-main:#f4f6f9;--bg-card:#fff;--bg-elevated:#eef2f7;--bg-hover:#eef3f9;--bg-active-nav:#e9eef6;--text:#0f172a;--text-secondary:#475569;--text-muted:#64748b;--border:#e4e9f2;--accent:#1e60d5;--accent-hover:#174fb3;--accent-soft:#e8f1fd;--amber:#f59e0b;--danger:#ef4444;--success:#10b981;--shadow-card:0 2px 10px #0f172a0a;--shadow-lg:0 12px 32px #0f172a1a;--radius:16px;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif}[data-theme=dark]{--bg-app:#0b1120;--bg-rail:#0f172a;--bg-panel:#0f172a;--bg-main:#0b1120;--bg-card:#1e293b;--bg-elevated:#283548;--bg-hover:#1e293b;--bg-active-nav:#1e293b;--text:#f8fafc;--text-secondary:#cbd5e1;--text-muted:#94a3b8;--border:#94a3b829;--accent:#2574e8;--accent-hover:#1d63c9;--accent-soft:#2574e82e;--shadow-card:0 6px 20px #00000059;--shadow-lg:0 18px 46px #0000008c}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg-app);color:var(--text);-webkit-font-smoothing:antialiased;height:100vh;overflow:hidden}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}button{cursor:pointer;border:none}.bk-workspace{background:var(--bg-app);width:100vw;height:100vh;display:flex;overflow:hidden}.bk-sidebar{background:var(--bg-rail);border-right:1px solid var(--border);z-index:25;flex-direction:column;flex-shrink:0;gap:12px;width:248px;padding:16px 14px;transition:width .2s;display:flex}.bk-sidebar.collapsed{align-items:center;width:74px;padding:16px 10px}.bk-sidebar-brand{justify-content:space-between;align-items:center;gap:10px;width:100%;padding:2px 4px;display:flex}.bk-brand-left{cursor:pointer;align-items:center;gap:10px;min-width:0;display:flex}.bk-brand-title{color:var(--text);letter-spacing:-.3px;white-space:nowrap;font-size:17px;font-weight:800}.bk-icon-btn{width:28px;height:28px;color:var(--text-muted);background:0 0;border-radius:8px;justify-content:center;align-items:center;transition:background .15s,color .15s;display:flex}.bk-icon-btn:hover{background:var(--bg-hover);color:var(--text)}.bk-new-book-btn{background:var(--accent);color:#fff;border-radius:10px;justify-content:center;align-items:center;gap:8px;width:100%;height:42px;font-size:14px;font-weight:600;transition:background .15s;display:flex;box-shadow:0 4px 12px #1e60d53d}.bk-new-book-btn:hover{background:var(--accent-hover)}.bk-sidebar-search{width:100%;position:relative}.bk-sidebar-search svg{color:var(--text-muted);pointer-events:none;position:absolute;top:50%;left:11px;transform:translateY(-50%)}.bk-sidebar-search input{border:1px solid var(--border);background:var(--bg-panel);width:100%;height:38px;color:var(--text);border-radius:10px;outline:none;padding:0 12px 0 34px;font-size:13px}.bk-sidebar-search input:focus{border-color:var(--accent)}.bk-nav-menu{flex-direction:column;gap:4px;width:100%;display:flex}.bk-nav-item{width:100%;height:42px;color:var(--text-secondary);text-align:left;background:0 0;border-radius:10px;align-items:center;gap:11px;padding:0 12px;font-size:14px;font-weight:500;transition:background .14s,color .14s;display:flex}.bk-sidebar.collapsed .bk-nav-item{justify-content:center;padding:0}.bk-nav-item:hover{background:var(--bg-hover);color:var(--text)}.bk-nav-item.active{background:var(--bg-active-nav);color:var(--text);font-weight:600}.bk-sidebar-spacer{flex:1}.bk-sidebar-footer{border-top:1px solid var(--border);flex-direction:column;gap:10px;width:100%;padding-top:12px;display:flex}.bk-lang-switcher{background:var(--bg-main);border:1px solid var(--border);border-radius:9px;gap:2px;padding:3px;display:flex}.bk-lang-btn{height:26px;color:var(--text-secondary);background:0 0;border-radius:6px;flex:1;font-size:11px;font-weight:700}.bk-lang-btn.active{background:var(--accent);color:#fff}.bk-theme-row{color:var(--text-secondary);cursor:pointer;-webkit-user-select:none;user-select:none;justify-content:space-between;align-items:center;padding:4px 6px;font-size:13px;display:flex}.bk-theme-label{align-items:center;gap:8px;display:flex}.bk-switch{background:#cbd5e1;border-radius:99px;flex-shrink:0;width:38px;height:21px;transition:background .2s;position:relative}.bk-switch.on{background:var(--accent)}.bk-switch-knob{background:#fff;border-radius:50%;width:17px;height:17px;transition:transform .2s;position:absolute;top:2px;left:2px;box-shadow:0 1px 3px #0003}.bk-switch.on .bk-switch-knob{transform:translate(17px)}.bk-user-pill{background:var(--bg-active-nav);border-radius:12px;align-items:center;gap:10px;width:100%;padding:8px 10px;display:flex}.bk-user-avatar{background:var(--accent);color:#fff;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:34px;height:34px;font-size:13px;font-weight:700;display:flex}.bk-user-meta{flex:1;min-width:0}.bk-user-name{color:var(--text);white-space:nowrap;text-overflow:ellipsis;font-size:13px;font-weight:700;overflow:hidden}.bk-user-sub{color:var(--text-muted);font-size:11px}.bk-main{flex:1;min-width:0;height:100vh;padding:26px 30px 48px;overflow-y:auto}.bk-page-header{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;margin-bottom:18px;display:flex}.bk-page-title{letter-spacing:-.5px;color:var(--text);font-size:28px;font-weight:800}.categories-row{gap:8px;margin-bottom:22px;padding-bottom:6px;display:flex;overflow-x:auto}.category-pill{background:var(--bg-card);border:1px solid var(--border);color:var(--text-secondary);white-space:nowrap;border-radius:999px;padding:7px 15px;font-size:13px;font-weight:500;transition:all .15s}.category-pill:hover{border-color:var(--accent);color:var(--text)}.category-pill.active{background:var(--accent);border-color:var(--accent);color:#fff}.section{margin-bottom:32px}.section-header{justify-content:space-between;align-items:center;margin-bottom:14px;display:flex}.section-title{color:var(--text);letter-spacing:-.2px;font-size:20px;font-weight:700}.show-all-btn{background:var(--bg-elevated);color:var(--text-secondary);border-radius:9px;padding:6px 14px;font-size:12px;font-weight:600;transition:background .15s,color .15s}.show-all-btn:hover{background:var(--bg-active-nav);color:var(--text)}.grid-cards{grid-template-columns:repeat(auto-fill,minmax(176px,1fr));gap:18px;display:grid}.item-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-card);cursor:pointer;flex-direction:column;gap:10px;padding:12px;transition:transform .16s,box-shadow .16s,border-color .16s;display:flex}.item-card:hover{border-color:#1e60d561;transform:translateY(-3px);box-shadow:0 8px 24px #0f172a14}.item-card.active-card{border-color:var(--accent);box-shadow:0 0 0 2px #1e60d529}.cover-wrap{aspect-ratio:1;background:#1a2d5a;border-radius:11px;justify-content:center;align-items:center;display:flex;position:relative;overflow:hidden}.cover-wrap img{object-fit:cover;width:100%;height:100%}.tier-badge{-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);z-index:2;border-radius:999px;padding:3px 8px;font-size:10px;font-weight:700;position:absolute;top:8px;right:8px}.tier-free{color:#fff;background:#10b981e6}.tier-subscription{color:#0f172a;background:#f59e0beb}.tier-purchasable{color:#fff;background:#1e60d5eb}.card-body{flex-direction:column;flex:1;gap:3px;display:flex}.card-title{color:var(--text);white-space:nowrap;text-overflow:ellipsis;font-size:14px;font-weight:700;line-height:1.3;overflow:hidden}.card-author,.card-narrator{color:var(--text-muted);white-space:nowrap;text-overflow:ellipsis;font-size:12px;overflow:hidden}.card-progress-row{align-items:center;gap:8px;margin-top:6px;display:flex}.card-progress-track{background:var(--bg-elevated);border-radius:999px;flex:1;height:5px;overflow:hidden}.card-progress-fill{background:var(--accent);border-radius:999px;height:100%;transition:width .25s}.card-progress-pct{color:var(--text-secondary);text-align:right;min-width:28px;font-size:11px;font-weight:600}.art-cover{text-align:center;-webkit-user-select:none;user-select:none;flex-direction:column;justify-content:flex-start;align-items:center;width:100%;height:100%;padding:12px 10px 0;display:flex;position:relative;overflow:hidden}.art-cover-bauhaus{background:#172b56;justify-content:center;padding:0}.art-bauhaus-grid{grid-template-rows:repeat(3,1fr);grid-template-columns:repeat(4,1fr);display:grid;position:absolute;inset:0}.b-tile{position:relative;overflow:hidden}.b-gold-tl{background:radial-gradient(circle at 0 0,#c9a15b 68%,#1e4b94 69%)}.b-blue-tr{background:radial-gradient(circle at 100% 0,#2359ad 68%,#172b56 69%)}.b-navy-bl{background:radial-gradient(circle at 0 100%,#172b56 68%,#c9a15b 69%)}.b-gold-br{background:radial-gradient(circle at 100% 100%,#c9a15b 68%,#172b56 69%)}.b-blue-tl{background:radial-gradient(circle at 0 0,#2359ad 68%,#c9a15b 69%)}.b-gold-tr{background:radial-gradient(circle at 100% 0,#c9a15b 68%,#172b56 69%)}.b-gold-bl{background:radial-gradient(circle at 0 100%,#c9a15b 68%,#2359ad 69%)}.b-blue-br{background:radial-gradient(circle at 100% 100%,#1e4b94 68%,#c9a15b 69%)}.art-bauhaus-label{z-index:1;color:#0f172a;background:#fff;width:74%;padding:10px 12px;position:relative;box-shadow:0 4px 12px #00000038}.art-bauhaus-title{-webkit-line-clamp:2;-webkit-box-orient:vertical;font-family:Georgia,Times New Roman,serif;font-size:13px;font-weight:700;line-height:1.2;display:-webkit-box;overflow:hidden}.art-cover-teal{color:#f1f5f9;background:linear-gradient(#2d5c68 0%,#244b55 100%)}.art-cover-gold{color:#1e1b18;background:linear-gradient(#d7be82 0%,#c8a968 100%)}.art-cover-burgundy{color:#f8fafc;background:radial-gradient(circle at 50% 25%,#2a080c 0%,#4b1218 100%)}.art-cover-sand{color:#1e1b18;background:linear-gradient(#dec9a4 0%,#d3ba91 100%)}.art-top-author{letter-spacing:.4px;color:#ffffffc7;white-space:nowrap;text-overflow:ellipsis;max-width:92%;margin-bottom:3px;font-size:9px;overflow:hidden}.art-top-author.dark{color:#18181bb8}.art-serif-title{color:#fff;-webkit-line-clamp:2;-webkit-box-orient:vertical;max-width:94%;font-family:Georgia,Times New Roman,serif;font-size:14px;font-weight:700;line-height:1.18;display:-webkit-box;overflow:hidden}.art-serif-title.dark{color:#18181b}.art-Cover-svg{width:88%;height:auto;margin-top:auto;display:block}.art-wave-bars{justify-content:space-between;align-items:center;gap:3px;width:82%;height:46%;margin-top:auto;margin-bottom:16px;display:flex}.art-wave-bars span{background:#ffebe6d9;border-radius:99px;flex:1}.bk-player-dock{background:var(--bg-panel);border-left:1px solid var(--border);z-index:20;flex-direction:column;flex-shrink:0;width:348px;height:100vh;padding:22px 22px 18px;display:flex;overflow-y:auto}.bk-dock-cover{aspect-ratio:1;border-radius:16px;width:100%;max-width:268px;margin:0 auto 16px;overflow:hidden;box-shadow:0 10px 26px #0f172a24}.bk-dock-cover img{object-fit:cover;width:100%;height:100%}.bk-dock-book-meta{text-align:center;margin-bottom:18px}.bk-dock-book-title{color:var(--text);letter-spacing:-.3px;margin-bottom:4px;font-size:20px;font-weight:800}.bk-dock-book-author{color:var(--text-muted);font-size:13px}.bk-dock-chapter-meta{margin-bottom:10px}.bk-dock-chapter-title{color:var(--text);font-size:14px;font-weight:700;line-height:1.35}.bk-dock-chapter-sub{color:var(--text-muted);margin-top:2px;font-size:12px}.bk-range-slider{appearance:none;background:var(--bg-elevated);cursor:pointer;border-radius:999px;outline:none;width:100%;height:5px}.bk-range-slider::-webkit-slider-thumb{appearance:none;background:var(--accent);cursor:pointer;border-radius:50%;width:14px;height:14px;box-shadow:0 1px 4px #1e60d566}.bk-range-slider::-moz-range-thumb{background:var(--accent);cursor:pointer;border:none;border-radius:50%;width:14px;height:14px}.bk-dock-seek-times{color:var(--text-secondary);justify-content:space-between;margin-top:6px;margin-bottom:14px;font-size:12px;font-weight:500;display:flex}.bk-dock-transport{justify-content:center;align-items:center;gap:16px;margin-bottom:18px;display:flex}.bk-transport-btn{width:38px;height:38px;color:var(--text);background:0 0;border-radius:50%;justify-content:center;align-items:center;transition:background .15s,color .15s;display:flex}.bk-transport-btn:hover{background:var(--bg-hover);color:var(--accent)}.bk-play-circle-btn{background:var(--accent);color:#fff;border-radius:50%;justify-content:center;align-items:center;width:56px;height:56px;transition:background .15s,transform .1s;display:flex;box-shadow:0 6px 18px #1e60d559}.bk-play-circle-btn:hover{background:var(--accent-hover);transform:scale(1.03)}.bk-dock-aux-row{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;gap:14px;margin-bottom:16px;padding-bottom:16px;display:flex}.bk-volume-box{color:var(--text-secondary);flex:1;align-items:center;gap:8px;display:flex}.bk-speed-btn{color:var(--text);background:0 0;border-radius:8px;align-items:center;gap:5px;padding:5px 10px;font-size:13px;font-weight:600;display:inline-flex}.bk-speed-btn:hover{background:var(--bg-hover)}.bk-dock-chapters-heading{color:var(--text);margin-bottom:10px;font-size:16px;font-weight:700}.bk-dock-chapters-list{flex-direction:column;flex:1;gap:4px;display:flex}.bk-dock-chapter-item{color:var(--text);cursor:pointer;border-radius:10px;justify-content:space-between;align-items:center;gap:10px;padding:10px 12px;font-size:13px;transition:background .14s;display:flex}.bk-dock-chapter-item:hover{background:var(--bg-hover)}.bk-dock-chapter-item.active{background:var(--accent-soft);color:var(--accent);font-weight:600}.bk-dock-chapter-left{align-items:center;gap:8px;min-width:0;display:flex}.bk-dock-chapter-name{white-space:nowrap;text-overflow:ellipsis;overflow:hidden}.bk-dock-chapter-dur{color:var(--text-secondary);flex-shrink:0;font-size:12px}.bk-dock-chapter-item.active .bk-dock-chapter-dur{color:var(--accent);font-weight:600}.btn-primary{background:var(--accent);color:#fff;border-radius:10px;padding:9px 18px;font-size:14px;font-weight:600;transition:all .15s}.btn-primary:hover{background:var(--accent-hover)}.btn-secondary{background:var(--bg-elevated);color:var(--text);border-radius:10px;padding:8px 14px;font-size:13px;font-weight:600}.btn-secondary:hover{background:var(--bg-active-nav)}.search-input{background:var(--bg-card);border:1px solid var(--border);width:100%;color:var(--text);border-radius:10px;padding:9px 14px;font-size:14px}.search-input:focus{outline:2px solid var(--accent)}.detail-layout{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-card);grid-template-columns:240px 1fr;gap:28px;margin-bottom:32px;padding:24px;display:grid}.chapter-list{flex-direction:column;gap:8px;display:flex}.chapter-row{background:var(--bg-card);border:1px solid var(--border);border-radius:12px;justify-content:space-between;align-items:center;gap:12px;padding:12px 16px;display:flex}.chapter-row.playing{border-color:var(--accent);background:var(--accent-soft)}.select-pill{background:var(--bg-elevated);color:var(--text);border:1px solid var(--border);border-radius:8px;padding:5px 8px;font-size:12px;font-weight:600}@media (width<=1120px){.bk-player-dock{width:300px;padding:18px 16px}}@media (width<=860px){.bk-workspace{flex-direction:column;height:auto;min-height:100vh}body{height:auto;overflow:auto}.bk-sidebar{border-right:none;border-bottom:1px solid var(--border);width:100%}.bk-main{height:auto;padding:20px 16px}.bk-player-dock{border-left:none;border-top:1px solid var(--border);width:100%;height:auto}.detail-layout{grid-template-columns:1fr}}