:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: #1a1a2e;
  --bg-elevated: #22223a;
  --bg-hover: #2a2a45;
  --text-primary: #f0f0ff;
  --text-secondary: #9898b8;
  --text-muted: #6868a0;
  --accent: #ff4444;
  --accent2: #ff6b6b;
  --accent-dim: rgba(255,68,68,.15);
  --green: #4caf50;
  --green-dim: rgba(76,175,80,.1);
  --gradient-1: linear-gradient(135deg,#ff4444,#ff6b6b);
  --gradient-text: linear-gradient(135deg,#ff4444,#ff8c42,#ff6b6b);
  --shadow-glow: 0 0 40px rgba(255,68,68,.15);
  --radius: 16px;
  --radius-sm: 10px;
  --transition: .3s cubic-bezier(.4,0,.2,1);
  --font: 'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
}
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:var(--font);background:var(--bg-primary);color:var(--text-primary);min-height:100vh;overflow-x:hidden;line-height:1.6;-webkit-font-smoothing:antialiased}
.noise{position:fixed;inset:0;background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");opacity:.015;pointer-events:none;z-index:0}
.container{max-width:900px;margin:0 auto;padding:0 20px;position:relative;z-index:1}

header{position:sticky;top:0;z-index:100;background:rgba(10,10,15,.8);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-bottom:1px solid rgba(255,255,255,.04)}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:14px 0}
.logo{display:flex;align-items:center;gap:10px}
.logo-icon{width:34px;height:34px;flex-shrink:0}
.logo-text{font-size:1.3rem;font-weight:800;letter-spacing:-.5px}
.logo-highlight{background:var(--gradient-text);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.logo-badge{font-size:.6rem;font-weight:700;letter-spacing:1.5px;padding:2px 8px;background:var(--accent-dim);color:var(--accent);border-radius:6px;border:1px solid rgba(255,68,68,.2);margin-left:2px}
nav{display:flex;gap:4px;background:var(--bg-secondary);padding:4px;border-radius:var(--radius-sm)}
.nav-btn{display:flex;align-items:center;gap:6px;padding:8px 16px;border:none;border-radius:8px;background:transparent;color:var(--text-secondary);font-family:var(--font);font-size:.85rem;font-weight:500;cursor:pointer;transition:var(--transition)}
.nav-btn:hover{color:var(--text-primary);background:var(--bg-hover)}
.nav-btn.active{background:var(--bg-elevated);color:var(--text-primary)}
.tab-content{display:none;animation:fadeIn .4s ease}
.tab-content.active{display:block}
@keyframes fadeIn{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}
@keyframes spin{to{transform:rotate(360deg)}}

.hero{text-align:center;padding:44px 0 30px;position:relative}
.hero-particles{position:absolute;inset:0;overflow:hidden;pointer-events:none}
.particle{position:absolute;width:4px;height:4px;background:var(--accent);border-radius:50%;animation:float linear infinite}
@keyframes float{0%{transform:translateY(0) scale(1);opacity:0}10%{opacity:.25}90%{opacity:.25}100%{transform:translateY(-200px) scale(0);opacity:0}}
.hero-title{font-size:clamp(1.8rem,5vw,3rem);font-weight:900;line-height:1.2;letter-spacing:-1px;margin-bottom:10px}
.gradient-text{background:var(--gradient-text);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-subtitle{font-size:.95rem;color:var(--text-secondary);margin-bottom:18px}
.supported-badges{display:flex;justify-content:center;gap:8px;flex-wrap:wrap}
.badge{padding:4px 14px;font-size:.72rem;font-weight:700;letter-spacing:.3px;border-radius:20px;background:var(--bg-elevated);color:var(--text-secondary);border:1px solid rgba(255,255,255,.06);transition:var(--transition)}
.badge:hover{background:var(--accent-dim);color:var(--accent);border-color:rgba(255,68,68,.3)}

.input-section{display:flex;gap:10px;margin-bottom:6px;position:relative}
.input-section.drag-over .input-wrapper{border-color:var(--accent);box-shadow:0 0 30px rgba(255,68,68,.2);background:var(--bg-card)}
.input-wrapper{flex:1;display:flex;align-items:center;gap:10px;background:var(--bg-secondary);border:1.5px solid rgba(255,255,255,.06);border-radius:var(--radius);padding:0 16px;transition:var(--transition)}
.input-wrapper:focus-within{border-color:var(--accent);box-shadow:var(--shadow-glow);background:var(--bg-card)}
.input-icon{flex-shrink:0;color:var(--text-muted)}
.input-wrapper input{flex:1;background:transparent;border:none;outline:none;color:var(--text-primary);font-family:var(--font);font-size:.95rem;padding:16px 0;min-width:0}
.input-wrapper input::placeholder{color:var(--text-muted)}
.paste-btn,.clear-btn{background:none;border:none;color:var(--text-muted);cursor:pointer;padding:6px;border-radius:8px;transition:var(--transition);display:flex;align-items:center;justify-content:center;flex-shrink:0}
.paste-btn:hover,.clear-btn:hover{color:var(--text-primary);background:var(--bg-hover)}
.clear-btn{display:none}.input-wrapper.has-text .clear-btn{display:flex}

.fetch-btn{display:flex;align-items:center;justify-content:center;gap:8px;padding:16px 28px;background:var(--gradient-1);color:#fff;border:none;border-radius:var(--radius);font-family:var(--font);font-size:1rem;font-weight:600;cursor:pointer;transition:var(--transition);white-space:nowrap;min-width:130px;position:relative;overflow:hidden}
.fetch-btn::before{content:'';position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.12),transparent);transition:var(--transition)}
.fetch-btn:hover::before{left:100%}
.fetch-btn:hover{transform:translateY(-2px);box-shadow:0 8px 30px rgba(255,68,68,.3)}
.fetch-btn:active{transform:translateY(0)}
.fetch-btn.loading .btn-text{display:none}
.fetch-btn.loading .btn-loader{display:flex}
.fetch-btn .btn-loader{display:none;animation:spin .8s linear infinite;width:22px;height:22px}

.input-hints{text-align:center;font-size:.75rem;color:var(--text-muted);margin-bottom:16px;letter-spacing:.2px}
.hint-key{padding:1px 6px;background:var(--bg-secondary);border-radius:4px;font-size:.7rem;font-weight:600;font-family:monospace;border:1px solid rgba(255,255,255,.06)}
.hint-dot{margin:0 6px;opacity:.4}

.error-message{display:none;align-items:center;gap:10px;padding:14px 18px;background:rgba(255,68,68,.08);border:1px solid rgba(255,68,68,.2);border-radius:var(--radius-sm);color:#ff6b6b;font-size:.9rem;margin-bottom:20px;animation:shake .4s ease}
.error-message.visible{display:flex}
@keyframes shake{0%,100%{transform:translateX(0)}25%{transform:translateX(-6px)}75%{transform:translateX(6px)}}

.result-section{display:none;animation:slideUp .5s ease}
.result-section.visible{display:block}
@keyframes slideUp{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}

.video-card{display:flex;gap:20px;background:var(--bg-card);border-radius:var(--radius);padding:20px;border:1px solid rgba(255,255,255,.04);margin-bottom:20px;position:relative}
.video-thumbnail-wrapper{position:relative;flex-shrink:0;width:240px;border-radius:var(--radius-sm);overflow:hidden}
.video-thumbnail{width:100%;display:block;aspect-ratio:16/9;object-fit:cover;background:var(--bg-elevated)}
.video-duration{position:absolute;bottom:8px;right:8px;padding:2px 8px;background:rgba(0,0,0,.85);border-radius:6px;font-size:.8rem;font-weight:600}
.thumb-dl-btn{position:absolute;top:8px;right:8px;width:32px;height:32px;border:none;border-radius:8px;background:rgba(0,0,0,.7);color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;opacity:0;transition:var(--transition);backdrop-filter:blur(4px)}
.video-thumbnail-wrapper:hover .thumb-dl-btn{opacity:1}
.thumb-dl-btn:hover{background:rgba(255,68,68,.8)}

.video-info{flex:1;min-width:0}
.video-title{font-size:1.15rem;font-weight:700;line-height:1.4;margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-meta{display:flex;align-items:center;gap:8px;flex-wrap:wrap;color:var(--text-secondary);font-size:.88rem;margin-bottom:8px}
.meta-sep{color:var(--text-muted);font-size:.6rem}
.video-tags{display:flex;gap:6px;flex-wrap:wrap}
.video-tag{padding:3px 10px;background:var(--bg-secondary);border-radius:6px;font-size:.68rem;color:var(--text-muted);border:1px solid rgba(255,255,255,.04)}

.preview-section{background:var(--bg-card);border-radius:var(--radius);padding:16px 20px;border:1px solid rgba(255,255,255,.04);margin-bottom:20px}
.preview-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}
.preview-header span{font-weight:600;font-size:.95rem}
.preview-toggle{padding:6px 18px;border:1px solid rgba(255,255,255,.1);border-radius:8px;background:var(--bg-secondary);color:var(--text-secondary);font-family:var(--font);font-size:.82rem;font-weight:500;cursor:pointer;transition:var(--transition)}
.preview-toggle:hover{background:var(--bg-hover);color:var(--text-primary)}
.preview-toggle.active{background:var(--accent-dim);color:var(--accent);border-color:rgba(255,68,68,.3)}
.preview-player{display:none;border-radius:var(--radius-sm);overflow:hidden;aspect-ratio:16/9}
.preview-player.open{display:block}
.preview-player iframe{width:100%;height:100%;border:none}

.quality-section{background:var(--bg-card);border-radius:var(--radius);padding:20px;border:1px solid rgba(255,255,255,.04);margin-bottom:20px}
.quality-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}
.section-title{font-size:1.05rem;font-weight:700}

.format-tabs{display:flex;gap:4px;background:var(--bg-secondary);padding:3px;border-radius:8px}
.fmt-tab{padding:6px 14px;border:none;border-radius:6px;background:transparent;color:var(--text-muted);font-family:var(--font);font-size:.78rem;font-weight:600;cursor:pointer;transition:var(--transition)}
.fmt-tab:hover{color:var(--text-primary)}
.fmt-tab.active{background:var(--bg-elevated);color:var(--text-primary)}

.quality-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:8px;margin-bottom:16px}
.quality-option{position:relative;padding:12px 8px;background:var(--bg-secondary);border:1.5px solid rgba(255,255,255,.04);border-radius:var(--radius-sm);cursor:pointer;transition:var(--transition);text-align:center}
.quality-option:hover{border-color:rgba(255,255,255,.1);background:var(--bg-hover)}
.quality-option.selected{border-color:var(--accent);background:var(--accent-dim);box-shadow:0 0 20px rgba(255,68,68,.1)}
.quality-option .q-icon{display:block;margin-bottom:4px;font-size:1.1rem}
.quality-option .q-label{display:block;font-size:.9rem;font-weight:700;margin-bottom:2px}
.quality-option .q-size{display:block;font-size:.65rem;color:var(--text-muted);font-weight:500}
.quality-option.selected .q-label{color:var(--accent)}
.quality-option .q-badge{display:none;position:absolute;top:-6px;right:-6px;background:var(--gradient-1);color:#fff;font-size:.5rem;font-weight:700;padding:2px 6px;border-radius:6px;letter-spacing:.5px}
.quality-option.best .q-badge{display:block}
.quality-option .q-limit{position:absolute;top:-6px;left:-6px;font-size:.5rem;font-weight:700;padding:2px 6px;border-radius:6px;background:var(--green);color:#fff}

.download-actions{display:flex;gap:10px}
.download-btn{display:flex;align-items:center;justify-content:center;gap:10px;flex:1;padding:16px;background:var(--gradient-1);color:#fff;border:none;border-radius:var(--radius-sm);font-family:var(--font);font-size:1rem;font-weight:700;cursor:pointer;transition:var(--transition);letter-spacing:.3px}
.download-btn:not(:disabled):hover{transform:translateY(-2px);box-shadow:0 8px 30px rgba(255,68,68,.3)}
.download-btn:disabled{opacity:.4;cursor:not-allowed}
.download-btn.downloading{background:var(--bg-elevated);border:1px solid rgba(255,255,255,.06);cursor:default;pointer-events:none}

.copy-btn{display:flex;align-items:center;justify-content:center;width:52px;background:var(--bg-secondary);border:1.5px solid rgba(255,255,255,.06);border-radius:var(--radius-sm);color:var(--text-secondary);cursor:pointer;transition:var(--transition);flex-shrink:0}
.copy-btn:hover{background:var(--bg-hover);color:var(--text-primary);border-color:rgba(255,68,68,.3)}
.copy-btn.copied{background:var(--green-dim);color:var(--green);border-color:rgba(76,175,80,.3)}

.progress-section{display:none;background:var(--bg-card);border-radius:var(--radius);padding:20px;border:1px solid rgba(255,255,255,.04);margin-bottom:20px;animation:fadeIn .4s ease}
.progress-section.visible{display:block}
.progress-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}
.progress-title{font-weight:600;font-size:.9rem}
.progress-status{font-size:.8rem;color:var(--text-secondary)}
.progress-bar{width:100%;height:5px;background:var(--bg-secondary);border-radius:10px;overflow:hidden;margin-bottom:8px}
.progress-fill{height:100%;background:var(--gradient-1);border-radius:10px;width:0%;transition:width .3s ease}
.progress-details{display:flex;justify-content:space-between;font-size:.75rem;color:var(--text-muted)}

.dl-links{display:flex;flex-direction:column;gap:8px;margin-bottom:20px}
.dl-link{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:12px 16px;background:var(--bg-secondary);border:1px solid rgba(255,255,255,.04);border-radius:var(--radius-sm);text-decoration:none;color:var(--text-primary);transition:var(--transition);font-size:.85rem}
.dl-link:hover{background:var(--bg-hover);border-color:rgba(255,68,68,.2)}
.dl-link svg{flex-shrink:0;color:var(--accent)}
.dl-link span{font-size:.78rem;color:var(--text-secondary)}

.history-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px;padding-top:40px}
.history-actions{display:flex;gap:8px}
.clear-history-btn{display:flex;align-items:center;gap:6px;padding:8px 16px;background:var(--bg-secondary);border:1px solid rgba(255,255,255,.06);border-radius:var(--radius-sm);color:var(--text-secondary);font-family:var(--font);font-size:.82rem;font-weight:500;cursor:pointer;transition:var(--transition)}
.clear-history-btn:hover{color:#ff6b6b;border-color:rgba(255,68,68,.3);background:rgba(255,68,68,.08)}
.history-stats{display:flex;gap:16px;margin-bottom:16px;flex-wrap:wrap}
.stat-item{padding:8px 16px;background:var(--bg-card);border-radius:var(--radius-sm);font-size:.82rem}
.stat-item span:first-child{color:var(--text-muted);margin-right:6px}
.stat-item span:last-child{color:var(--text-primary);font-weight:600}
.history-list{display:flex;flex-direction:column;gap:8px}

.history-empty{text-align:center;padding:60px 20px;color:var(--text-muted)}
.history-empty p{margin-top:12px;font-size:.9rem}
.history-item{display:flex;align-items:center;gap:14px;padding:12px;background:var(--bg-card);border-radius:var(--radius-sm);border:1px solid rgba(255,255,255,.04);animation:fadeIn .3s ease;cursor:pointer;transition:var(--transition)}
.history-item:hover{background:var(--bg-elevated)}
.history-item-thumb{width:80px;aspect-ratio:16/9;border-radius:8px;object-fit:cover;background:var(--bg-elevated);flex-shrink:0}
.history-item-info{flex:1;min-width:0}
.history-item-title{font-size:.88rem;font-weight:600;margin-bottom:3px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.history-item-meta{font-size:.75rem;color:var(--text-muted)}
.history-item-quality{padding:3px 10px;background:var(--bg-secondary);border-radius:6px;font-size:.68rem;font-weight:700;color:var(--accent);white-space:nowrap}

.tools-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:16px;padding-bottom:40px}
.tool-card{padding:24px;background:var(--bg-card);border-radius:var(--radius);border:1px solid rgba(255,255,255,.04)}
.tool-icon{font-size:2rem;margin-bottom:10px}
.tool-card h3{font-size:1rem;font-weight:700;margin-bottom:6px}
.tool-card p{font-size:.82rem;color:var(--text-secondary);margin-bottom:14px;line-height:1.5}
.tool-input-row{display:flex;gap:8px}
.tool-input-row input{flex:1;padding:10px 14px;background:var(--bg-secondary);border:1.5px solid rgba(255,255,255,.06);border-radius:8px;color:var(--text-primary);font-family:var(--font);font-size:.85rem;outline:none;transition:var(--transition)}
.tool-input-row input:focus{border-color:var(--accent)}
.tool-btn{padding:10px 20px;background:var(--gradient-1);color:#fff;border:none;border-radius:8px;font-family:var(--font);font-size:.85rem;font-weight:600;cursor:pointer;transition:var(--transition);white-space:nowrap}
.tool-btn:hover{transform:translateY(-1px);box-shadow:0 4px 20px rgba(255,68,68,.3)}
.tool-output{margin-top:12px;font-size:.82rem;color:var(--text-secondary);word-break:break-all}
.tool-dl-link{display:inline-flex;align-items:center;gap:6px;margin-top:8px;padding:8px 16px;background:var(--accent-dim);color:var(--accent);border-radius:8px;text-decoration:none;font-size:.82rem;font-weight:600;transition:var(--transition)}
.tool-dl-link:hover{background:rgba(255,68,68,.25)}

footer{text-align:center;padding:40px 0;color:var(--text-muted);font-size:.8rem}

.toast{position:fixed;bottom:30px;left:50%;transform:translateX(-50%) translateY(80px);background:var(--bg-elevated);color:var(--text-primary);padding:12px 24px;border-radius:var(--radius-sm);border:1px solid rgba(255,255,255,.08);font-size:.85rem;font-weight:500;z-index:200;opacity:0;transition:all .4s ease;pointer-events:none;backdrop-filter:blur(10px)}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

.shortcuts-modal{position:fixed;inset:0;z-index:300;display:none;align-items:center;justify-content:center;background:rgba(0,0,0,.6);backdrop-filter:blur(8px)}
.shortcuts-modal.open{display:flex}
.shortcuts-modal-content{background:var(--bg-card);border-radius:var(--radius);padding:32px;max-width:400px;width:90%;border:1px solid rgba(255,255,255,.06)}
.shortcuts-modal-content h3{font-size:1.1rem;font-weight:700;margin-bottom:20px}
.shortcut-row{display:flex;justify-content:space-between;padding:8px 0;border-bottom:1px solid rgba(255,255,255,.04);font-size:.85rem}
.shortcut-row:last-child{border:none}
.shortcut-row kbd{padding:2px 10px;background:var(--bg-secondary);border-radius:6px;font-size:.78rem;font-weight:600;font-family:monospace;border:1px solid rgba(255,255,255,.06)}

@media(max-width:768px){
  .header-inner{flex-direction:column;gap:12px}
  .input-section{flex-direction:column}
  .fetch-btn{min-width:100%}
  .video-card{flex-direction:column}
  .video-thumbnail-wrapper{width:100%}
  .hero{padding:34px 0 22px}
  .quality-grid{grid-template-columns:repeat(auto-fill,minmax(100px,1fr))}
  .tools-grid{grid-template-columns:1fr}
  .history-stats{flex-direction:column;gap:8px}
}
@media(max-width:480px){
  .quality-grid{grid-template-columns:repeat(2,1fr)}
  .history-item{flex-wrap:wrap}
  .history-item-thumb{width:100%;aspect-ratio:16/9}
  .download-actions{flex-direction:column}
  .copy-btn{width:100%;height:48px}
  .format-tabs{overflow-x:auto}
}