:root{--bg-primary: #0a0a0f;--bg-secondary: #12121a;--bg-card: #1a1a28;--bg-card-hover: #22223a;--bg-input: #14141f;--text-primary: #f0f0f5;--text-secondary: #9494a8;--text-muted: #5e5e72;--accent: #7c5cfc;--accent-hover: #9b7eff;--accent-glow: rgba(124, 92, 252, .25);--accent-subtle: rgba(124, 92, 252, .08);--success: #22c55e;--success-bg: rgba(34, 197, 94, .1);--warning: #f59e0b;--warning-bg: rgba(245, 158, 11, .1);--error: #ef4444;--error-bg: rgba(239, 68, 68, .1);--border: rgba(255, 255, 255, .06);--border-hover: rgba(255, 255, 255, .12);--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-xl: 24px;--transition-fast: .15s cubic-bezier(.4, 0, .2, 1);--transition-normal: .25s cubic-bezier(.4, 0, .2, 1);--transition-slow: .4s cubic-bezier(.4, 0, .2, 1);--shadow-sm: 0 2px 8px rgba(0, 0, 0, .2);--shadow-md: 0 4px 16px rgba(0, 0, 0, .3);--shadow-lg: 0 8px 32px rgba(0, 0, 0, .4);--shadow-glow: 0 0 40px var(--accent-glow)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif;background:var(--bg-primary);color:var(--text-primary);min-height:100vh;overflow-x:hidden}body:before{content:"";position:fixed;top:-30%;left:-10%;width:600px;height:600px;background:radial-gradient(circle,rgba(124,92,252,.08) 0%,transparent 70%);pointer-events:none;z-index:0}body:after{content:"";position:fixed;bottom:-20%;right:-10%;width:500px;height:500px;background:radial-gradient(circle,rgba(34,197,94,.05) 0%,transparent 70%);pointer-events:none;z-index:0}#app{position:relative;z-index:1;max-width:960px;margin:0 auto;padding:40px 24px 80px}.header{text-align:center;margin-bottom:48px}.header__top-bar{display:flex;justify-content:flex-end;margin-bottom:16px}.lang-switch{padding:5px 10px;background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-secondary);font-size:12px;font-family:inherit;cursor:pointer;outline:none;transition:border-color var(--transition-fast)}.lang-switch:focus{border-color:var(--accent)}.lang-switch option{background:var(--bg-card);color:var(--text-primary)}.header__logo{display:inline-flex;align-items:center;gap:10px;margin-bottom:16px}.header__icon{width:40px;height:40px;background:linear-gradient(135deg,var(--accent),#a78bfa);border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;font-size:20px;box-shadow:var(--shadow-glow)}.header__title{font-size:28px;font-weight:800;letter-spacing:-.5px;background:linear-gradient(135deg,var(--text-primary),var(--accent-hover));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.header__subtitle{color:var(--text-secondary);font-size:15px;font-weight:400;line-height:1.6}.header__badge{display:inline-flex;align-items:center;gap:6px;margin-top:12px;padding:6px 14px;background:var(--success-bg);color:var(--success);border-radius:100px;font-size:12px;font-weight:500;border:1px solid rgba(34,197,94,.15)}.header__badge:before{content:"";width:6px;height:6px;background:var(--success);border-radius:50%;animation:pulse 2s ease-in-out infinite}@keyframes pulse{0%,to{opacity:1;transform:scale(1)}50%{opacity:.5;transform:scale(.8)}}.upload-zone{position:relative;border:2px dashed var(--border);border-radius:var(--radius-lg);padding:60px 40px;text-align:center;cursor:pointer;transition:all var(--transition-normal);background:var(--bg-secondary);overflow:hidden}.upload-zone:hover{border-color:var(--accent);background:var(--accent-subtle);transform:translateY(-2px);box-shadow:var(--shadow-glow)}.upload-zone.dragging{border-color:var(--accent);background:var(--accent-subtle);box-shadow:var(--shadow-glow)}.upload-zone__icon{font-size:48px;margin-bottom:16px;display:block}.upload-zone__title{font-size:18px;font-weight:600;margin-bottom:8px}.upload-zone__hint{font-size:13px;color:var(--text-muted)}.upload-zone input[type=file]{display:none}.mode-select{display:none;flex-direction:column;align-items:center;gap:20px}.mode-select.active{display:flex}.mode-select__title{font-size:18px;font-weight:600;text-align:center}.mode-select__cards{display:grid;grid-template-columns:1fr 1fr;gap:16px;width:100%;max-width:640px}.mode-card{position:relative;padding:24px 20px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);cursor:pointer;transition:all var(--transition-normal);text-align:left;font-family:inherit;color:var(--text-primary)}.mode-card:hover{border-color:var(--border-hover);transform:translateY(-2px);box-shadow:var(--shadow-md)}.mode-card.selected,.mode-card--highlight:hover{border-color:var(--accent);box-shadow:var(--shadow-glow)}.mode-card--highlight{border-color:#7c5cfc4d;background:linear-gradient(135deg,var(--bg-card) 0%,rgba(124,92,252,.05) 100%)}.mode-card__tag{display:inline-block;padding:2px 8px;border-radius:100px;font-size:10px;font-weight:600;text-transform:uppercase;letter-spacing:.5px;margin-bottom:10px;background:var(--bg-input);color:var(--text-muted)}.mode-card__tag--accent{background:var(--accent);color:#fff}.mode-card__title{font-size:15px;font-weight:600;margin-bottom:6px}.mode-card__desc{font-size:12px;color:var(--text-secondary);line-height:1.5}.rate-limit-banner{display:none;width:100%;max-width:640px;padding:16px 20px;background:var(--warning-bg);border:1px solid rgba(245,158,11,.2);border-radius:var(--radius-md);text-align:center;animation:hintFadeIn .4s ease-out}.rate-limit-banner.active{display:block}.rate-limit-banner__title{font-size:15px;font-weight:600;color:var(--warning);margin-bottom:4px}.rate-limit-banner__msg{font-size:13px;color:var(--text-secondary);line-height:1.5}.editor{display:none;flex-direction:column;gap:24px}.editor.active{display:flex}.video-container{position:relative;background:var(--bg-secondary);border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--border)}.video-container__wrapper{position:relative;width:100%;display:flex;justify-content:center;background:#000}.video-container video{max-width:100%;max-height:480px;display:block}.video-container canvas{position:absolute;top:0;left:0;cursor:crosshair}.video-container__label{position:absolute;top:12px;left:12px;padding:4px 10px;background:#000000b3;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);color:var(--text-primary);font-size:11px;font-weight:500;border-radius:100px;letter-spacing:.5px;text-transform:uppercase;z-index:5}.video-toolbar{display:flex;align-items:center;gap:8px;padding:10px 16px;background:var(--bg-card);border-top:1px solid var(--border)}.video-toolbar__btn{width:36px;height:36px;border-radius:50%;border:1px solid var(--border);background:var(--bg-input);color:var(--text-primary);font-size:14px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all var(--transition-fast);flex-shrink:0;font-family:inherit}.video-toolbar__btn:hover{background:var(--bg-card-hover);border-color:var(--border-hover)}.video-toolbar__btn--small{width:28px;height:28px;font-size:10px}.video-toolbar__seek{flex:1;height:4px;-webkit-appearance:none;-moz-appearance:none;appearance:none;background:var(--bg-input);border-radius:100px;outline:none;cursor:pointer}.video-toolbar__seek::-webkit-slider-thumb{-webkit-appearance:none;width:14px;height:14px;border-radius:50%;background:var(--accent);cursor:pointer;box-shadow:0 0 8px var(--accent-glow);transition:transform var(--transition-fast)}.video-toolbar__seek::-webkit-slider-thumb:hover{transform:scale(1.3)}.video-toolbar__seek::-moz-range-thumb{width:14px;height:14px;border-radius:50%;background:var(--accent);cursor:pointer;border:none;box-shadow:0 0 8px var(--accent-glow)}.video-toolbar__time{font-size:11px;font-weight:500;color:var(--text-muted);font-variant-numeric:tabular-nums;white-space:nowrap;flex-shrink:0;min-width:80px;text-align:right}.video-toolbar__fps{padding:4px 8px;background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-secondary);font-size:11px;font-family:inherit;cursor:pointer;flex-shrink:0;outline:none;transition:border-color var(--transition-fast)}.video-toolbar__fps:focus{border-color:var(--accent)}.video-toolbar__fps option{background:var(--bg-card);color:var(--text-primary)}.video-toolbar__hint{padding:8px 16px;background:var(--warning-bg);border-top:1px solid rgba(245,158,11,.12);font-size:12px;color:var(--warning);text-align:center;animation:hintFadeIn .5s ease-out}@keyframes hintFadeIn{0%{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:translateY(0)}}.controls{background:var(--bg-card);border-radius:var(--radius-lg);padding:24px;border:1px solid var(--border)}.controls__section{margin-bottom:20px}.controls__section:last-child{margin-bottom:0}.controls__label{font-size:12px;font-weight:600;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.8px;margin-bottom:12px;display:block}.presets{display:flex;flex-wrap:wrap;gap:8px}.preset-chip{padding:8px 16px;background:var(--bg-input);border:1px solid var(--border);border-radius:100px;color:var(--text-secondary);font-size:13px;font-weight:500;cursor:pointer;transition:all var(--transition-fast);font-family:inherit;display:flex;align-items:center;gap:6px}.preset-chip:hover{border-color:var(--border-hover);color:var(--text-primary);background:var(--bg-card-hover)}.preset-chip.active{border-color:var(--accent);color:var(--accent-hover);background:var(--accent-subtle);box-shadow:0 0 12px var(--accent-glow)}.preset-chip__icon{font-size:14px}.coord-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.coord-field{display:flex;flex-direction:column;gap:4px}.coord-field label{font-size:11px;color:var(--text-muted);font-weight:500}.coord-field input{padding:8px 10px;background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-primary);font-size:13px;font-family:Inter,monospace;transition:border-color var(--transition-fast);width:100%}.coord-field input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-glow)}.actions{display:flex;gap:12px}.btn{flex:1;padding:14px 24px;border-radius:var(--radius-md);font-size:14px;font-weight:600;font-family:inherit;cursor:pointer;transition:all var(--transition-fast);border:none;display:inline-flex;align-items:center;justify-content:center;gap:8px}.btn--primary{background:linear-gradient(135deg,var(--accent),#6c4ce6);color:#fff;box-shadow:var(--shadow-md),0 0 20px var(--accent-glow)}.btn--primary:hover:not(:disabled){background:linear-gradient(135deg,var(--accent-hover),var(--accent));transform:translateY(-1px);box-shadow:var(--shadow-lg),0 0 30px var(--accent-glow)}.btn--primary:disabled{opacity:.5;cursor:not-allowed}.btn--secondary{background:var(--bg-input);color:var(--text-secondary);border:1px solid var(--border)}.btn--secondary:hover{background:var(--bg-card-hover);color:var(--text-primary);border-color:var(--border-hover)}.btn--success{background:linear-gradient(135deg,#22c55e,#16a34a);color:#fff}.btn--success:hover{transform:translateY(-1px);box-shadow:var(--shadow-lg),0 0 20px #22c55e4d}.progress{display:none;background:var(--bg-card);border-radius:var(--radius-lg);padding:24px;border:1px solid var(--border)}.progress.active{display:block}.progress__header{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}.progress__title{font-size:14px;font-weight:600;display:flex;align-items:center;gap:8px}.progress__percent{font-size:14px;font-weight:700;color:var(--accent-hover);font-variant-numeric:tabular-nums}.progress__bar{width:100%;height:6px;background:var(--bg-input);border-radius:100px;overflow:hidden}.progress__fill{height:100%;width:0%;background:linear-gradient(90deg,var(--accent),#a78bfa);border-radius:100px;transition:width var(--transition-normal)}.progress__status{margin-top:10px;font-size:12px;color:var(--text-muted)}.spinner{display:inline-block;width:16px;height:16px;border:2px solid var(--accent-glow);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.result{display:none;background:var(--bg-card);border-radius:var(--radius-lg);padding:24px;border:1px solid rgba(34,197,94,.2)}.result.active{display:block}.result__header{display:flex;align-items:center;gap:10px;margin-bottom:16px}.result__icon{width:36px;height:36px;background:var(--success-bg);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:18px}.result__title{font-size:16px;font-weight:600}.result__subtitle{font-size:12px;color:var(--text-muted)}.result__preview{background:#000;border-radius:var(--radius-md);overflow:hidden;margin-bottom:16px}.result__preview video{width:100%;max-height:400px;display:block}.ffmpeg-loading{display:none;position:fixed;top:0;right:0;bottom:0;left:0;background:#0a0a0fd9;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);z-index:100;align-items:center;justify-content:center;flex-direction:column;gap:20px}.ffmpeg-loading.active{display:flex}.ffmpeg-loading__spinner{width:48px;height:48px;border:3px solid var(--accent-glow);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}.ffmpeg-loading__text{font-size:15px;font-weight:500;color:var(--text-secondary)}.footer{text-align:center;margin-top:60px;padding-top:24px;border-top:1px solid var(--border)}.footer__text{font-size:12px;color:var(--text-muted);line-height:1.8}@media(max-width:640px){#app{padding:24px 16px 60px}.header__title{font-size:22px}.upload-zone{padding:40px 24px}.coord-grid{grid-template-columns:repeat(2,1fr)}.actions{flex-direction:column}}