:root{--primary:#6366f1;--primary-hover:#4f46e5;--primary-light:#eef2ff;--bg:#f8fafc;--surface:#fff;--border:#e2e8f0;--text:#0f172a;--text-muted:#64748b;--success:#10b981;--radius:12px;--shadow:0 1px 3px rgba(0,0,0,.06),0 1px 2px rgba(0,0,0,.04);--shadow-lg:0 10px 15px -3px rgba(0,0,0,.08),0 4px 6px -2px rgba(0,0,0,.04)}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans SC,sans-serif;line-height:1.6;-webkit-font-smoothing:antialiased}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}.container{max-width:1100px;margin:0 auto;padding:0 20px}.header{background:var(--surface);border-bottom:1px solid var(--border);position:-webkit-sticky;position:sticky;top:0;z-index:100;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.header-inner{justify-content:space-between;height:64px}.header-inner,.logo{display:flex;align-items:center}.logo{font-size:20px;font-weight:700;color:var(--text);gap:8px}.logo:hover{text-decoration:none}.logo-icon{width:32px;height:32px;background:linear-gradient(135deg,var(--primary),#8b5cf6);border-radius:8px;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800}.nav{display:flex;gap:24px}.nav a{color:var(--text-muted);font-size:15px;font-weight:500}.nav a:hover{color:var(--primary);text-decoration:none}.hero{text-align:center;padding:64px 0 48px}.hero h1{font-size:42px;font-weight:800;margin:0 0 16px;letter-spacing:-.02em;background:linear-gradient(135deg,var(--text),var(--primary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.hero p{font-size:18px;color:var(--text-muted);max-width:600px;margin:0 auto}.section-title{font-size:24px;font-weight:700;margin:48px 0 24px}.tools-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));grid-gap:20px;gap:20px;margin-bottom:48px}.tool-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px;transition:all .2s;display:block;color:var(--text)}.tool-card:hover{border-color:var(--primary);box-shadow:var(--shadow-lg);transform:translateY(-2px);text-decoration:none}.tool-icon{width:48px;height:48px;background:var(--primary-light);border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:24px;margin-bottom:16px}.tool-card h3{margin:0 0 8px;font-size:18px;font-weight:600}.tool-card p{margin:0;color:var(--text-muted);font-size:14px}.tool-page{padding:40px 0}.tool-header{margin-bottom:32px}.tool-header h1{font-size:32px;font-weight:700;margin:0 0 8px}.tool-header p{color:var(--text-muted);font-size:16px;margin:0}.drop-zone{border:2px dashed var(--border);border-radius:var(--radius);padding:48px 24px;text-align:center;cursor:pointer;transition:all .2s;background:var(--surface)}.drop-zone.dragover,.drop-zone:hover{border-color:var(--primary);background:var(--primary-light)}.drop-zone-icon{font-size:48px;margin-bottom:12px}.drop-zone-text{color:var(--text-muted);font-size:15px}.drop-zone-hint{font-size:13px;color:var(--text-muted);margin-top:8px}.preview-area{margin-top:24px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px}.preview-img{max-width:100%;max-height:300px;border-radius:8px;display:block;margin:0 auto}.file-info{display:flex;justify-content:space-between;align-items:center;margin-top:16px;padding-top:16px;border-top:1px solid var(--border);font-size:14px;color:var(--text-muted)}.compression-result{display:flex;gap:32px;margin-top:16px}.compression-stat{text-align:center}.compression-stat-value{font-size:24px;font-weight:700;color:var(--primary)}.compression-stat-label{font-size:12px;color:var(--text-muted)}.controls{margin-top:24px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px}.control-group{margin-bottom:20px}.control-group:last-child{margin-bottom:0}.control-label{display:block;font-size:14px;font-weight:600;margin-bottom:8px}.control-value{float:right;color:var(--primary);font-weight:600}input[type=range]{width:100%;accent-color:var(--primary)}input[type=number],input[type=text],select{width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:8px;font-size:14px;background:var(--surface);color:var(--text)}input[type=number]:focus,input[type=text]:focus,select:focus{outline:none;border-color:var(--primary)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 24px;border:none;border-radius:8px;font-size:15px;font-weight:600;cursor:pointer;transition:all .2s;text-decoration:none}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-hover);text-decoration:none}.btn-primary:disabled{opacity:.5;cursor:not-allowed}.btn-secondary{background:var(--surface);color:var(--text);border:1px solid var(--border)}.btn-secondary:hover{border-color:var(--primary);color:var(--primary);text-decoration:none}.btn-group{display:flex;gap:12px;flex-wrap:wrap}.ad-slot{background:#f1f5f9;border:1px dashed #cbd5e1;border-radius:8px;padding:32px;text-align:center;color:var(--text-muted);font-size:13px;margin:32px 0}.footer{border-top:1px solid var(--border);background:var(--surface);padding:32px 0;margin-top:64px}.footer-inner{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px}.footer-text{color:var(--text-muted);font-size:14px}.footer-links{display:flex;gap:24px}.footer-links a{color:var(--text-muted);font-size:14px}.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:var(--text);color:#fff;padding:12px 24px;border-radius:8px;font-size:14px;z-index:1000;animation:slideUp .3s}@keyframes slideUp{0%{opacity:0;transform:translate(-50%,20px)}to{opacity:1;transform:translate(-50%)}}@media (max-width:640px){.hero h1{font-size:30px}.nav{display:none}.tools-grid{grid-template-columns:1fr}}