:root{--bg-primary: #faf7f2;--bg-secondary: #f5f1eb;--bg-card: #fefcf9;--bg-card-hover: #f0ebe3;--text-primary: #1a1a2e;--text-secondary: #5a5a7a;--text-muted: #9797b8;--border: #e6e0d8;--border-focus: #6366f1;--accent-1: #2563eb;--accent-2: #1d4ed8;--accent-3: #3b82f6;--glow: rgba(37, 99, 235, .12);--radius: 16px;--radius-sm: 10px;--radius-xs: 6px;--shadow: 0 4px 24px rgba(0, 0, 0, .06);--shadow-hover: 0 8px 40px rgba(99, 102, 241, .1);--font: "Segoe UI", -apple-system, BlinkMacSystemFont, sans-serif}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:var(--font);background:var(--bg-primary);color:var(--text-primary);line-height:1.6;min-height:100vh;overflow-x:hidden}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:var(--bg-primary)}::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}.app{display:flex;flex-direction:column;min-height:100vh}main{flex:1}.header{position:fixed;top:0;left:0;right:0;z-index:100;background:#faf7f2e0;backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-bottom:1px solid var(--border)}.header-inner{max-width:1200px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;padding:12px 24px}.logo{display:flex;align-items:center;gap:8px;background:none;border:none;color:var(--text-primary);cursor:pointer;font-size:20px;font-weight:700}.logo-icon{font-size:24px}.nav{display:flex;align-items:center;gap:8px}.nav-btn{background:none;border:none;color:var(--text-secondary);padding:8px 16px;border-radius:var(--radius-xs);cursor:pointer;font-size:14px;font-family:var(--font);transition:all .2s;text-decoration:none;display:inline-flex;align-items:center;gap:6px}.nav-btn:hover,.nav-btn.active{color:var(--text-primary);background:var(--bg-card-hover)}.nav-premium{font-weight:600}.premium-badge{font-size:10px;font-weight:700;background:linear-gradient(135deg,#f59e0b,#d97706);color:#fff;padding:2px 6px;border-radius:4px;letter-spacing:.5px}.premium-badge-sm{font-size:9px;font-weight:700;background:linear-gradient(135deg,#f59e0b,#d97706);color:#fff;padding:1px 5px;border-radius:3px;margin-left:6px;vertical-align:middle;letter-spacing:.5px}.hero{position:relative;min-height:100vh;display:flex;align-items:center;justify-content:center;padding:120px 24px 80px;overflow:hidden}.hero-bg{position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none;z-index:0}.hero-orbe{position:absolute;border-radius:50%;filter:blur(80px);opacity:.12}.orbe-1{width:600px;height:600px;background:radial-gradient(circle,#6366f1,transparent);top:-200px;right:-200px;animation:float 8s ease-in-out infinite}.orbe-2{width:500px;height:500px;background:radial-gradient(circle,#1d4ed8,transparent);bottom:-150px;left:-150px;animation:float 10s ease-in-out infinite reverse}.orbe-3{width:300px;height:300px;background:radial-gradient(circle,#0ea5e9,transparent);top:50%;left:50%;transform:translate(-50%,-50%);animation:float 12s ease-in-out infinite}@keyframes float{0%,to{transform:translate(0)}50%{transform:translate(30px,-30px)}}.hero-content{position:relative;z-index:1;max-width:800px;text-align:center;display:flex;flex-direction:column;align-items:center;gap:24px}.hero-badge{display:inline-flex;align-items:center;gap:6px;padding:6px 16px;border-radius:100px;background:#6366f10f;border:1px solid rgba(99,102,241,.15);color:var(--accent-1);font-size:13px;font-weight:500}.hero-title{font-size:clamp(36px,6vw,64px);font-weight:800;line-height:1.15;letter-spacing:-.02em}.gradient-text{background:linear-gradient(135deg,var(--accent-1),var(--accent-3),#0ea5e9);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.hero-subtitle{font-size:18px;color:var(--text-secondary);max-width:560px;line-height:1.7}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;justify-content:center}.btn-primary,.btn-secondary{display:inline-flex;align-items:center;gap:8px;padding:12px 28px;border-radius:var(--radius-sm);font-size:15px;font-weight:600;cursor:pointer;font-family:var(--font);border:none;transition:all .2s}.btn-primary{background:linear-gradient(135deg,var(--accent-1),var(--accent-3));color:#fff;box-shadow:0 4px 20px var(--glow)}.btn-primary:hover{transform:translateY(-1px);box-shadow:0 6px 30px var(--glow)}.btn-primary:disabled{opacity:.5;cursor:not-allowed;transform:none}.btn-lg{padding:16px 36px;font-size:17px}.btn-secondary{background:var(--bg-card);color:var(--text-primary);border:1px solid var(--border)}.btn-secondary:hover{background:var(--bg-card-hover)}.btn-ghost{background:none;border:1px solid var(--border);color:var(--text-secondary);padding:6px 14px;border-radius:var(--radius-xs);cursor:pointer;font-size:13px;font-family:var(--font);transition:all .2s}.btn-ghost:hover{color:var(--text-primary);border-color:var(--text-muted)}.hero-categories{display:flex;gap:8px;flex-wrap:wrap;justify-content:center}.cat-chip{display:inline-flex;align-items:center;gap:6px;padding:8px 16px;border-radius:100px;background:var(--bg-card);border:1px solid var(--border);color:var(--text-secondary);cursor:pointer;font-size:13px;font-family:var(--font);text-decoration:none;transition:all .2s}.cat-chip:hover{border-color:var(--chip-color, var(--accent-1));color:var(--text-primary);box-shadow:0 0 20px #6366f114}.cat-premium{background:linear-gradient(135deg,#f59e0b0f,#d977060f);border-color:#f59e0b33;font-weight:600}.cat-premium:hover{border-color:#f59e0b;box-shadow:0 0 20px #f59e0b26}.hero-stats{display:flex;gap:40px;margin-top:16px;padding:24px 40px;border-radius:var(--radius);background:var(--bg-card);border:1px solid var(--border);box-shadow:var(--shadow)}.stat{display:flex;flex-direction:column;align-items:center;gap:4px}.stat-value{font-size:28px;font-weight:800;background:linear-gradient(135deg,var(--accent-1),var(--accent-3));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.stat-label{font-size:13px;color:var(--text-muted)}.features{padding:100px 24px;max-width:1100px;margin:0 auto}.section-title{font-size:36px;font-weight:800;text-align:center;margin-bottom:12px}.section-desc{text-align:center;color:var(--text-secondary);font-size:17px;max-width:500px;margin:0 auto 48px}.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:20px;margin-bottom:80px}.feature-card{padding:32px;border-radius:var(--radius);background:var(--bg-card);border:1px solid var(--border);transition:all .3s;box-shadow:var(--shadow)}.feature-card:hover{border-color:var(--accent-1);transform:translateY(-4px);box-shadow:var(--shadow-hover)}.feature-premium{background:linear-gradient(135deg,#f59e0b08,#d9770608);border-color:#f59e0b26}.feature-premium:hover{border-color:#f59e0b;box-shadow:0 8px 40px #f59e0b1a}.feature-icon{font-size:36px;margin-bottom:16px}.feature-title{font-size:18px;font-weight:700;margin-bottom:8px}.feature-desc{color:var(--text-secondary);font-size:14px;line-height:1.7}.feature-link{display:inline-block;margin-top:12px;font-size:13px;font-weight:600;color:#d97706;text-decoration:none}.feature-link:hover{text-decoration:underline}.category-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px}.category-card{display:flex;flex-direction:column;align-items:center;gap:8px;padding:28px 20px;border-radius:var(--radius);background:var(--bg-card);border:1px solid var(--border);cursor:pointer;font-family:var(--font);text-decoration:none;transition:all .3s;box-shadow:var(--shadow)}.category-card:hover{border-color:var(--cat-color, var(--accent-1));transform:translateY(-4px);box-shadow:var(--shadow-hover)}.card-premium-locked{opacity:.7}.category-icon{font-size:32px}.category-name{font-size:16px;font-weight:600;color:var(--text-primary)}.category-action{font-size:13px;color:var(--cat-color, var(--accent-1));font-weight:500}.converter-section{padding:100px 24px 60px;max-width:800px;margin:0 auto}.converter-header{display:flex;align-items:center;gap:16px;margin-bottom:24px}.back-btn{display:inline-flex;align-items:center;gap:4px;background:none;border:none;color:var(--text-secondary);font-size:14px;cursor:pointer;font-family:var(--font);padding:6px 12px;border-radius:var(--radius-xs);transition:all .2s}.back-btn:hover{background:var(--bg-card-hover);color:var(--text-primary)}.converter-title{font-size:24px;font-weight:700}.category-tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:24px}.cat-tab{display:inline-flex;align-items:center;gap:6px;padding:10px 20px;border-radius:var(--radius-sm);background:var(--bg-card);border:1px solid var(--border);color:var(--text-secondary);cursor:pointer;font-size:14px;font-family:var(--font);transition:all .2s}.cat-tab:hover{color:var(--text-primary)}.cat-tab.active{border-color:var(--tab-color, var(--accent-1));color:var(--tab-color, var(--accent-1));background:#6366f10a}.converter-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}.upload-area{display:flex;align-items:center;justify-content:center;padding:60px 40px;cursor:pointer;transition:all .3s;border:2px dashed var(--border);border-radius:var(--radius);margin:0;min-height:300px}.upload-area:hover,.upload-area.dragging{border-color:var(--accent-1);background:#6366f105}.upload-input{display:none}.upload-content{display:flex;flex-direction:column;align-items:center;gap:16px;text-align:center}.upload-svg{width:56px;height:56px;color:var(--text-muted);transition:all .3s}.upload-area:hover .upload-svg,.dragging .upload-svg{color:var(--accent-1);transform:translateY(-4px)}.upload-text{font-size:17px;font-weight:600;color:var(--text-primary)}.upload-hint{font-size:13px;color:var(--text-muted)}.converter-body{padding:28px;display:flex;flex-direction:column;gap:20px}.file-info{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;background:#6366f108;border-radius:var(--radius-sm);border:1px solid rgba(99,102,241,.1)}.file-details{display:flex;flex-direction:column;gap:2px}.file-name{font-weight:600;font-size:14px;word-break:break-all}.file-size{font-size:12px;color:var(--text-muted)}.format-row{display:grid;grid-template-columns:1fr auto 1fr;gap:12px;align-items:end}.format-group{display:flex;flex-direction:column;gap:6px}.format-label{font-size:13px;color:var(--text-secondary);font-weight:500}.format-select{width:100%;padding:10px 14px;border-radius:var(--radius-sm);background:var(--bg-secondary);border:1px solid var(--border);color:var(--text-primary);font-size:14px;font-family:var(--font);cursor:pointer;transition:border-color .2s;-webkit-appearance:none;-moz-appearance:none;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%239797b8' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center}.format-select:focus{outline:none;border-color:var(--accent-1)}.arrow{display:flex;align-items:center;padding-bottom:4px;color:var(--text-muted)}.text-op-row{grid-template-columns:1fr}.text-op-row .format-select{width:100%}.options-row{display:flex;gap:16px;flex-wrap:wrap}.opt-group{flex:1;min-width:150px;display:flex;flex-direction:column;gap:6px}.range-input{width:100%;height:6px;-moz-appearance:none;appearance:none;-webkit-appearance:none;background:var(--bg-secondary);border-radius:3px;outline:none;cursor:pointer}.range-input::-webkit-slider-thumb{-moz-appearance:none;appearance:none;-webkit-appearance:none;width:18px;height:18px;border-radius:50%;background:var(--accent-1);cursor:pointer;border:3px solid var(--bg-card);box-shadow:0 0 10px #6366f133}.opt-input{padding:8px 12px;border-radius:var(--radius-xs);background:var(--bg-secondary);border:1px solid var(--border);color:var(--text-primary);font-size:13px;font-family:var(--font)}.opt-input:focus{outline:none;border-color:var(--accent-1)}.resize-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}.preview-box{border-radius:var(--radius-sm);overflow:hidden;border:1px solid var(--border);max-height:300px;display:flex;align-items:center;justify-content:center;background:var(--bg-secondary)}.preview-img{max-width:100%;max-height:300px;object-fit:contain}.progress-bar{position:relative;height:8px;border-radius:4px;background:var(--bg-secondary);overflow:hidden}.progress-fill{height:100%;border-radius:4px;background:linear-gradient(90deg,var(--accent-1),var(--accent-3));transition:width .3s}.progress-text{position:absolute;right:0;top:-20px;font-size:12px;color:var(--text-muted)}.error-msg{padding:12px 16px;border-radius:var(--radius-sm);background:#ef44440a;border:1px solid rgba(239,68,68,.1);color:#dc2626;font-size:14px}.result-box{display:flex;flex-direction:column;align-items:center;gap:12px;padding:32px;border-radius:var(--radius-sm);background:#10b98108;border:1px solid rgba(16,185,129,.15)}.result-icon{animation:pop .4s ease-out}@keyframes pop{0%{transform:scale(0)}60%{transform:scale(1.2)}to{transform:scale(1)}}.result-text{font-size:18px;font-weight:700;color:#059669}.result-actions{display:flex;gap:12px;margin-top:8px}.btn-convert{width:100%;justify-content:center;padding:14px;font-size:16px}.footer{padding:40px 24px;border-top:1px solid var(--border);text-align:center}.footer-inner{max-width:800px;margin:0 auto;display:flex;flex-direction:column;align-items:center;gap:8px}.footer-brand{display:flex;align-items:center;gap:8px;font-size:18px;font-weight:700}.footer-tagline{color:var(--text-secondary);font-size:14px}.footer-copy{color:var(--text-muted);font-size:13px}@media (max-width: 768px){.hero{padding:100px 16px 60px}.format-row{grid-template-columns:1fr}.arrow{transform:rotate(90deg);justify-content:center}.hero-stats{gap:24px;padding:16px 24px;flex-wrap:wrap;justify-content:center}.resize-row,.features-grid{grid-template-columns:1fr}.category-cards{grid-template-columns:repeat(2,1fr)}}@media (max-width: 480px){.category-cards{grid-template-columns:1fr}.result-actions{flex-direction:column}.nav{gap:4px}.nav-btn{padding:6px 10px;font-size:12px}}