*{margin:0;padding:0;box-sizing:border-box}
:root{--bg:#0d1117;--bg2:#161b27;--card:#1a2233;--card2:#212b40;--txt:#e6edf3;--mut:#8b98ab;--acc:#6c8cff;--acc2:#b96cff;--ok:#3fd68c}
body{font-family:'Segoe UI',system-ui,sans-serif;background:var(--bg);color:var(--txt);min-height:100vh}
.topbar{display:flex;align-items:center;gap:20px;padding:14px 5%;background:var(--bg2);position:sticky;top:0;z-index:50;border-bottom:1px solid #232c3f}
.logo{font-size:22px;font-weight:800;white-space:nowrap}
.logo .accent{color:var(--acc)}
.search-wrap{flex:1}
#search{width:100%;max-width:520px;padding:10px 16px;border-radius:10px;border:1px solid #2b3550;background:var(--card);color:var(--txt);font-size:14px;outline:none}
#search:focus{border-color:var(--acc)}
.hero{text-align:center;padding:40px 5% 10px}
.hero h1{font-size:34px;background:linear-gradient(90deg,var(--acc),var(--acc2));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{color:var(--mut);margin-top:8px}
.stats{display:flex;justify-content:center;gap:14px;margin-top:22px;flex-wrap:wrap}
.stat{background:var(--card);border:1px solid #26314a;border-radius:12px;padding:12px 26px;text-align:center}
.stat b{display:block;font-size:24px;color:var(--acc)}
.stat span{font-size:12px;color:var(--mut)}
.tabs{display:flex;justify-content:center;gap:10px;margin:22px 0 8px}
.tab{padding:9px 22px;border-radius:20px;border:1px solid #2b3550;background:var(--card);color:var(--mut);cursor:pointer;font-size:14px;font-weight:600}
.tab.active{background:linear-gradient(90deg,var(--acc),var(--acc2));color:#fff;border-color:transparent}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(215px,1fr));gap:14px;padding:20px 5%}
.tool{background:var(--card);border:1px solid #26314a;border-radius:14px;padding:16px;cursor:pointer;transition:.15s;display:flex;flex-direction:column;gap:8px}
.tool:hover{background:var(--card2);transform:translateY(-3px);border-color:var(--acc)}
.tool .t-icon{font-size:26px}
.tool b{font-size:14px;line-height:1.3}
.tool p{font-size:12px;color:var(--mut);flex:1}
.badge{align-self:flex-start;font-size:10px;font-weight:700;padding:3px 9px;border-radius:10px}
.badge.audio{background:#1d3a2f;color:var(--ok)}
.badge.video{background:#3a1d38;color:#e08bff}
.badge.file{background:#1d2d3a;color:#6cc8ff}
.empty{text-align:center;color:var(--mut);padding:60px}
footer{text-align:center;color:var(--mut);padding:30px 5% 40px;font-size:13px}
footer .note{font-size:11px;margin-top:6px;opacity:.7}
.modal-backdrop{position:fixed;inset:0;background:rgba(0,0,0,.72);display:none;align-items:flex-start;justify-content:center;z-index:100;overflow-y:auto;padding:40px 16px}
.modal-backdrop.open{display:flex}
.modal{background:var(--bg2);border:1px solid #2b3550;border-radius:16px;width:100%;max-width:640px;padding:22px}
.modal-head{display:flex;justify-content:space-between;align-items:center;font-size:18px}
.close{background:none;border:none;color:var(--mut);font-size:20px;cursor:pointer}
.modal-desc{color:var(--mut);font-size:13px;margin:8px 0 14px}
.dropzone{border:2px dashed #34405e;border-radius:12px;padding:26px;text-align:center;cursor:pointer;transition:.15s}
.dropzone:hover,.dropzone.drag{border-color:var(--acc);background:#1c2740}
.dz-icon{font-size:34px;margin-bottom:6px}
.dz-inner span{display:block;color:var(--mut);font-size:12px;margin-top:4px}
.filelist{margin-top:10px;font-size:13px}
.filelist .fitem{display:flex;justify-content:space-between;background:var(--card);border-radius:8px;padding:8px 12px;margin-top:6px}
.filelist .fitem span{color:var(--mut)}
.controls{margin-top:14px;display:grid;grid-template-columns:1fr 1fr;gap:10px}
.controls label{font-size:12px;color:var(--mut);display:block;margin-bottom:4px}
.controls input,.controls select{width:100%;padding:8px 10px;border-radius:8px;border:1px solid #2b3550;background:var(--card);color:var(--txt);font-size:13px}
.controls .full{grid-column:1/-1}
.runbtn{width:100%;margin-top:16px;padding:12px;border:none;border-radius:10px;background:linear-gradient(90deg,var(--acc),var(--acc2));color:#fff;font-size:15px;font-weight:700;cursor:pointer}
.runbtn:disabled{opacity:.4;cursor:not-allowed}
.progress-wrap{margin-top:14px}
.progress-bar{height:8px;background:var(--card);border-radius:6px;overflow:hidden}
#progressFill{height:100%;width:0;background:linear-gradient(90deg,var(--acc),var(--acc2));transition:width .2s}
#progressText{font-size:12px;color:var(--mut)}
.result{margin-top:16px}
.result video,.result audio,.result img{width:100%;border-radius:10px;margin-top:10px;background:#000}
.dlbtn{display:inline-block;margin-top:10px;padding:10px 18px;border-radius:10px;background:var(--ok);color:#04160e;font-weight:700;text-decoration:none;font-size:14px}
.result .msg{color:var(--mut);font-size:13px;margin-top:6px}

/* SEO Content Sections */
.skip-link{position:absolute;top:-100%;left:16px;background:var(--acc);color:#fff;padding:8px 16px;border-radius:0 0 8px 8px;z-index:200;font-size:14px;text-decoration:none}
.skip-link:focus{top:0}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.content-section{max-width:900px;margin:0 auto;padding:30px 5%}
.content-section h2{font-size:22px;margin-bottom:14px;color:var(--txt)}
.content-section p{color:var(--mut);line-height:1.7;margin-bottom:12px}
.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:16px;margin-top:16px}
.feature-card{background:var(--card);border:1px solid #26314a;border-radius:12px;padding:18px}
.feature-card h3{font-size:15px;margin-bottom:8px}
.feature-card p{font-size:13px;color:var(--mut);line-height:1.6}
.steps-list{padding-left:20px;color:var(--mut);line-height:2}
.steps-list li{margin-bottom:6px}
.steps-list strong{color:var(--txt)}
.tools-list{list-style:none;padding:0}
.tools-list li{padding:8px 0;border-bottom:1px solid #1e2a3a;font-size:14px;color:var(--mut);line-height:1.6}
.tools-list li:last-child{border-bottom:none}
.tools-list strong{color:var(--txt)}
.faq-section .faq-item{background:var(--card);border:1px solid #26314a;border-radius:12px;padding:18px;margin-bottom:12px}
.faq-section h3{font-size:15px;margin-bottom:8px}
.faq-section p{font-size:13px;color:var(--mut);line-height:1.6}

/* Theme Toggle */
.theme-toggle{background:var(--card);border:1px solid #2b3550;border-radius:8px;padding:6px 10px;font-size:16px;cursor:pointer;color:var(--txt);transition:.2s}
.theme-toggle:hover{border-color:var(--acc);background:var(--card2)}

/* Light Mode */
body.light{--bg:#f5f7fa;--bg2:#ffffff;--card:#f0f2f5;--card2:#e8eaed;--txt:#1a1a2e;--mut:#5a6070;--acc:#4a6cf7;--acc2:#7c3aed;--ok:#16a34a}
body.light .topbar{background:var(--bg2);border-bottom-color:#e0e3e8}
body.light .tool{border-color:#e0e3e8}
body.light .tool:hover{border-color:var(--acc)}
body.light .stat{border-color:#e0e3e8}
body.light .tab{border-color:#e0e3e8;background:var(--card)}
body.light .modal{background:var(--bg2);border-color:#e0e3e8}
body.light .dropzone{border-color:#d0d4dc}
body.light .controls input,body.light .controls select{background:var(--card);border-color:#d0d4dc;color:var(--txt)}
body.light .faq-section .faq-item{border-color:#e0e3e8}
body.light .feature-card{border-color:#e0e3e8}
body.light .content-section p{color:var(--mut)}
body.light .steps-list{color:var(--mut)}
body.light .tools-list li{border-color:#e0e3e8;color:var(--mut)}
body.light .modal-desc{color:var(--mut)}
body.light .theme-toggle{background:var(--card);border-color:#e0e3e8}

/* Responsive - Tablet */
@media(max-width:900px){
  .hero h1{font-size:26px}
  .grid{grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:10px}
  .modal{max-width:95%}
  .controls{grid-template-columns:1fr}
  .controls .full{grid-column:1}
}

/* Responsive - Mobile */
@media(max-width:600px){
  .topbar{flex-wrap:wrap;gap:10px;padding:10px 3%}
  .logo{font-size:18px}
  #search{max-width:100%;font-size:13px}
  .hero{padding:24px 3% 8px}
  .hero h1{font-size:20px}
  .hero p{font-size:13px}
  .stats{gap:8px}
  .stat{padding:8px 16px}
  .stat b{font-size:18px}
  .tabs{gap:6px;flex-wrap:wrap}
  .tab{padding:7px 14px;font-size:12px}
  .grid{grid-template-columns:1fr 1fr;gap:8px;padding:12px 3%}
  .tool{padding:12px}
  .tool .t-icon{font-size:22px}
  .tool b{font-size:12px}
  .tool p{font-size:11px}
  .badge{font-size:9px;padding:2px 7px}
  .modal{padding:16px;border-radius:12px}
  .modal-head{font-size:16px}
  .dropzone{padding:18px}
  .dz-icon{font-size:28px}
  .runbtn{padding:10px;font-size:14px}
  .content-section{padding:20px 3%}
  .content-section h2{font-size:18px}
  .features-grid{grid-template-columns:1fr}
}

/* Responsive - Small Mobile */
@media(max-width:380px){
  .grid{grid-template-columns:1fr}
  .stat{padding:6px 12px}
  .stat b{font-size:16px}
}

/* ===== ENHANCED UI/UX (9.8 Edition) ===== */

/* Focus States (Accessibility) */
*:focus-visible{outline:2px solid var(--acc);outline-offset:2px;border-radius:4px}
*:focus:not(:focus-visible){outline:none}
.tool:focus-visible,.tab:focus-visible,button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:2px solid var(--acc);outline-offset:2px;box-shadow:0 0 0 4px rgba(108,140,255,0.15)}

/* Custom Scrollbar */
::-webkit-scrollbar{width:8px;height:8px}
::-webkit-scrollbar-track{background:var(--bg)}
::-webkit-scrollbar-thumb{background:#303d55;border-radius:4px}
::-webkit-scrollbar-thumb:hover{background:#3d4f6d}

/* Skeleton Loading */
@keyframes shimmer{0%{background-position:-400px 0}100%{background-position:400px 0}}
.skeleton{background:linear-gradient(90deg,#1a2233 25%,#212b40 50%,#1a2233 75%);background-size:400px 100%;animation:shimmer 1.5s infinite;border-radius:12px}
.skeleton-card{height:140px;margin-bottom:12px}

/* Toast Notifications */
@keyframes toastIn{from{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}
@keyframes toastOut{from{opacity:1}to{opacity:0}}
.toast{position:fixed;bottom:24px;right:24px;padding:14px 22px;border-radius:10px;font-size:14px;font-weight:600;z-index:9999;animation:toastIn .3s ease}
.toast-success{background:var(--ok);color:#04160e}
.toast-error{background:#ff4444;color:#fff}
.toast-info{background:var(--acc);color:#fff}
.toast-out{animation:toastOut .3s ease forwards}

/* Micro Animations */
@keyframes fadeIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.5}}
@keyframes spin{to{transform:rotate(360deg)}}
.tool{animation:fadeIn .3s ease both}
.tool:nth-child(2){animation-delay:.05s}
.tool:nth-child(3){animation-delay:.1s}
.tool:nth-child(4){animation-delay:.15s}
.tool:nth-child(5){animation-delay:.2s}
.tool:nth-child(n+6){animation-delay:.25s}
.spinner{width:20px;height:20px;border:2px solid var(--acc);border-top-color:transparent;border-radius:50%;animation:spin .8s linear infinite;display:inline-block}

/* Loading Bar */
.loading-bar{width:100%;height:3px;background:var(--card);border-radius:2px;overflow:hidden;margin-top:8px}
.loading-bar::after{content:'';display:block;height:100%;width:40%;background:linear-gradient(90deg,var(--acc),var(--acc2));border-radius:2px;animation:shimmer 1.2s infinite}

/* Improved Buttons */
.btn{padding:10px 20px;border:none;border-radius:8px;font-weight:700;cursor:pointer;transition:all .15s}
.btn-primary{background:linear-gradient(135deg,var(--acc),var(--acc2));color:#fff}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(108,140,255,0.3)}
.btn-primary:active{transform:translateY(0)}

/* Empty State */
.empty-state{text-align:center;padding:60px 20px;color:var(--mut)}
.empty-state .icon{font-size:48px;margin-bottom:16px}
.empty-state h3{color:var(--txt);margin-bottom:8px}
.empty-state p{font-size:14px}

/* Print Styles */
@media print{.topbar,.tabs,.modal-backdrop,footer{display:none!important}body{background:#fff;color:#000}}

/* Reduced Motion (Accessibility) */
@media (prefers-reduced-motion: reduce){*,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}

/* Dark Mode Variables */
[data-theme=light]{--bg:#f5f7fa;--bg2:#fff;--card:#e8ecf1;--card2:#dde3ec;--txt:#1a1a2e;--mut:#5a6a7e;--acc:#4c6fff;--acc2:#a55cff;--ok:#0d9950}

/* Keyboard Shortcut Hint */
.kbd{display:inline-block;padding:2px 6px;border-radius:4px;background:var(--card);border:1px solid #34405e;font-size:11px;font-family:monospace;color:var(--mut)}

/* Tool Card Hover Glow */
.tool:hover .t-icon{transform:scale(1.15);transition:transform .2s ease}
.tool .t-icon{transition:transform .2s ease}

/* Status Badge */
.status-badge{display:inline-flex;align-items:center;gap:4px;font-size:11px;padding:2px 8px;border-radius:10px}
.status-fast{background:#1d3a2f;color:var(--ok)}
.status-ffmpeg{background:#1a2a4a;color:var(--acc)}

/* ===== TIMELINE + PREVIEW (9.8) ===== */
.preview-panel,.timeline-panel{position:fixed;right:20px;bottom:20px;width:420px;max-width:92vw;background:var(--bg2);border:1px solid var(--card);border-radius:14px;z-index:900;box-shadow:0 12px 40px rgba(0,0,0,.5);overflow:hidden}
.preview-head{display:flex;justify-content:space-between;align-items:center;padding:10px 16px;border-bottom:1px solid #26314a;font-size:14px}
.preview-body{padding:12px}
.preview-body video{width:100%;border-radius:8px;background:#000;max-height:240px}
.timeline-body{padding:12px}
.timeline-track{position:relative;height:56px;background:repeating-linear-gradient(90deg,#1a2233 0 12px,#161b27 12px 24px);border-radius:8px;border:1px solid #26314a;margin-bottom:12px;overflow:hidden}
.timeline-track::before{content:'2s demo';position:absolute;inset:0;display:flex;align-items:center;justify-content:center;color:var(--mut);font-size:12px}
.timeline-controls{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.timeline-controls input{width:90px;padding:6px 8px;border-radius:6px;border:1px solid #2b3550;background:var(--card);color:var(--txt);font-size:12px}
.timeline-controls .btn{font-size:12px;padding:7px 12px}
#tlInfo{font-size:11px}
.batch-panel{position:fixed;left:20px;bottom:20px;width:380px;max-width:92vw;background:var(--bg2);border:1px solid #26314a;border-radius:14px;z-index:900;box-shadow:0 12px 40px rgba(0,0,0,.5);overflow:hidden}.batch-queue{max-height:260px;overflow-y:auto;padding:8px 12px}.batch-queue .fitem{font-size:12px}.kbd-help{position:fixed;inset:0;background:rgba(0,0,0,.6);z-index:9999;display:flex;align-items:center;justify-content:center}.kbd-help-box{background:var(--bg2);border:1px solid #26314a;border-radius:14px;padding:24px;max-width:420px;width:90vw}.kbd-help-box h3{margin-bottom:16px;font-size:16px}.kbd-help-box td{padding:8px 4px;border-bottom:1px solid #26314a;font-size:13px}.kbd-help-box td:first-child{width:120px}