.footer-cross a{margin-left:12px}:root{--surface:#ffffff;--surface-2:#f5f7ff;--ink:#0f172a;--ink-soft:#475569;--muted:#94a3b8;--primary:#4f46e5;--primary-dark:#4338ca;--primary-soft:#eef2ff;--accent:#06b6d4;--line:#e2e8f0;--line-strong:#cbd5e1;--success:#16a34a;--danger:#dc2626;--radius:14px;--radius-sm:10px;--shadow-sm:0 1px 2px rgba(15, 23, 42, 0.06),0 1px 3px rgba(15, 23, 42, 0.08);--shadow-md:0 8px 24px rgba(15, 23, 42, 0.08);--shadow-lg:0 24px 60px rgba(15, 23, 42, 0.14);--container:1080px;--container-narrow:760px;--font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:var(--font);color:var(--ink);background:var(--surface);line-height:1.6;-webkit-font-smoothing:antialiased}svg.icon{width:18px;height:18px;flex:0 0 auto;display:inline-block;vertical-align:-4px}svg.icon-lg{width:24px;height:24px}.btn .icon{color:inherit;margin-right:0}.back-top .icon{width:22px;height:22px;margin:0}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 24px}.container-narrow{max-width:var(--container-narrow)}.skip-link,.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}.skip-link:focus{position:fixed;top:12px;left:12px;width:auto;height:auto;padding:10px 16px;clip:auto;background:#fff;z-index:999;border-radius:8px;box-shadow:var(--shadow-md)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 22px;border-radius:999px;border:1px solid transparent;font-weight:600;font-size:15px;cursor:pointer;transition:.18s;text-decoration:none;line-height:1;white-space:nowrap}.btn:hover{text-decoration:none;transform:translateY(-1px)}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}.btn-primary{background:var(--primary);color:#fff;box-shadow:0 8px 20px rgba(79,70,229,.35)}.btn-primary:hover{background:var(--primary-dark)}.btn-ghost{background:#fff;color:var(--ink);border-color:var(--line-strong)}.btn-ghost:hover{background:var(--surface-2);border-color:var(--primary);color:var(--primary)}.btn-sm{padding:8px 14px;font-size:13.5px}.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.85);backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--line)}.header-inner{display:flex;align-items:center;justify-content:space-between;height:66px}.brand{display:inline-flex;align-items:center;gap:10px;color:var(--ink);font-weight:800;font-size:18px}.brand:hover{text-decoration:none}.brand-logo{width:34px;height:34px;display:grid;place-items:center;background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;border-radius:9px;box-shadow:0 4px 12px rgba(79,70,229,.4)}.brand-logo.small{width:28px;height:28px}.site-nav{display:flex;gap:26px}.site-nav a{color:var(--ink-soft);font-weight:500;font-size:15px}.site-nav a:hover{color:var(--primary);text-decoration:none}.hero{position:relative;overflow:hidden;background:radial-gradient(900px 500px at 85% -10%,rgba(6,182,212,.18),transparent 60%),radial-gradient(700px 500px at 0 0,rgba(79,70,229,.22),transparent 55%),linear-gradient(180deg,#0b1020 0,#131a36 100%);color:#fff;padding:44px 0 32px}.hero::after{content:"";position:absolute;inset:0;pointer-events:none;background-image:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);background-size:44px 44px;mask-image:radial-gradient(circle at 50% 30%,#000 0%,transparent 75%)}.hero .container{position:relative;z-index:1;text-align:center}.badge{display:inline-block;font-size:13px;font-weight:600;padding:7px 14px;border-radius:999px;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.18);margin-bottom:16px}.hero h1{font-size:clamp(26px, 4vw, 44px);line-height:1.1;margin:0 0 12px;font-weight:800;letter-spacing:-.03em}.hero h1 span{background:linear-gradient(90deg,#818cf8,#22d3ee);-webkit-background-clip:text;background-clip:text;color:transparent}.hero .lead{font-size:16px;color:#c7d2fe;max-width:640px;margin:0 auto}.section-title{text-align:center;font-size:clamp(26px, 3.4vw, 38px);font-weight:800;letter-spacing:-.02em;margin:0 0 12px}.section-sub{text-align:center;color:var(--ink-soft);font-size:17px;margin:0 auto 44px;max-width:640px}.tool{padding:28px 0 72px;background:var(--surface-2)}.upload-zone{display:grid;place-items:center;text-align:center;gap:8px;border:2px dashed var(--line-strong);border-radius:var(--radius);background:#fff;padding:56px 24px;cursor:pointer;transition:border-color .18s,background .18s,box-shadow .18s}.upload-zone:hover{border-color:var(--primary);background:var(--primary-soft)}.upload-zone.dragover{border-color:var(--primary);background:var(--primary-soft);box-shadow:0 0 0 6px rgba(79,70,229,.12)}.upload-zone .upload-icon{width:56px;height:56px;border-radius:16px;display:grid;place-items:center;background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;margin-bottom:4px}.upload-zone .upload-icon svg{width:28px;height:28px}.upload-zone h3{margin:0;font-size:19px}.upload-zone p{margin:0;color:var(--ink-soft);font-size:14.5px}.crop-stage{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow-sm)}.crop-canvas-wrap{width:100%;max-height:520px;margin-bottom:16px;border-radius:var(--radius-sm);overflow:hidden;background:#0f172a}.crop-canvas-wrap img{display:block;max-width:100%}.crop-toolbar{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px}.crop-status{font-size:14px;color:var(--ink-soft);font-weight:500}.crop-actions{display:flex;gap:8px;flex-wrap:wrap}.preset-bar{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:16px 20px;margin:16px 0;box-shadow:var(--shadow-sm)}.preset-group{margin-bottom:14px}.preset-group:last-child{margin-bottom:0}.preset-group-title{display:block;font-size:12px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin-bottom:8px}.preset-btns{display:flex;flex-wrap:wrap;gap:8px}.preset-btn{border:1px solid var(--line-strong);background:#fff;color:var(--ink);padding:8px 14px;border-radius:999px;font-size:13.5px;font-weight:600;cursor:pointer;transition:.15s}.preset-btn span{color:var(--muted);font-weight:500;font-size:12px;margin-left:4px}.preset-btn:hover{border-color:var(--primary);color:var(--primary)}.preset-btn.active{background:var(--primary);color:#fff;border-color:var(--primary);box-shadow:0 4px 12px rgba(79,70,229,.3)}.preset-btn.active span{color:rgba(255,255,255,.8)}.custom-row{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.custom-row input{width:80px;padding:8px 10px;border:1px solid var(--line-strong);border-radius:8px;font-size:14px}.custom-row input:focus{outline:0;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-soft)}.preview-round{display:flex;align-items:center;gap:12px;background:var(--surface-2);border:1px solid var(--line);border-radius:var(--radius-sm);padding:12px 16px;margin-top:12px}.preview-round .round-frame{width:64px;height:64px;border-radius:50%;overflow:hidden;border:2px solid var(--primary);flex:0 0 auto;background:#fff}.preview-round .round-frame img{width:100%;height:100%;object-fit:cover}.preview-round p{margin:0;font-size:13.5px;color:var(--ink-soft)}.features{padding:84px 0}.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}.feature{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow-sm);transition:transform .2s,box-shadow .2s}.feature:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}.feature-icon{width:48px;height:48px;border-radius:12px;display:grid;place-items:center;background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;margin-bottom:14px}.feature h3{margin:0 0 8px;font-size:18px}.feature p{margin:0;color:var(--ink-soft);font-size:14.5px}.how{padding:84px 0;background:var(--surface-2)}.steps{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(3,1fr);gap:24px}.steps li{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow-sm)}.step-num{width:42px;height:42px;border-radius:50%;display:grid;place-items:center;background:var(--primary-soft);color:var(--primary);font-weight:800;font-size:18px;margin-bottom:14px}.steps h3{margin:0 0 6px;font-size:18px}.steps p{margin:0;color:var(--ink-soft);font-size:15px}.cheatsheet{padding:84px 0}.cs-table-wrap{overflow-x:auto;box-shadow:var(--shadow-sm);border:1px solid var(--line);border-radius:var(--radius)}table.cs-table{width:100%;border-collapse:collapse;background:#fff;min-width:560px}.cs-table td,.cs-table th{padding:12px 16px;text-align:left;border-bottom:1px solid var(--line);font-size:14.5px}.cs-table thead th{background:var(--primary-soft);color:var(--primary-dark);font-weight:700}.cs-table th[scope=row]{color:var(--ink);font-weight:600}.cs-table td{color:var(--ink-soft)}.cs-table tbody tr:last-child td{border-bottom:none}.cs-table .plat{font-weight:700;color:var(--primary)}.faq{padding:84px 0}.faq details{background:#fff;border:1px solid var(--line);border-radius:var(--radius-sm);padding:4px 20px;margin-bottom:12px;box-shadow:var(--shadow-sm)}.faq summary{cursor:pointer;font-weight:600;font-size:16.5px;padding:14px 0;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:12px}.faq summary::-webkit-details-marker{display:none}.faq summary::after{content:"+";font-size:22px;color:var(--primary);transition:transform .2s}.faq details[open] summary::after{content:"\2212"}.faq p{margin:0 0 14px;color:var(--ink-soft)}.site-footer{background:#0b1020;color:#cbd5e1;padding:40px 0}.footer-inner{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px}.footer-brand{display:inline-flex;align-items:center;gap:10px;font-weight:700;color:#fff}.site-footer nav{display:flex;gap:20px;flex-wrap:wrap}.site-footer nav a{color:#cbd5e1;font-size:14.5px}.site-footer nav a:hover{color:#fff}.site-footer .copy{font-size:13.5px;color:#94a3b8;margin:0}.back-top{position:fixed;bottom:26px;right:26px;width:46px;height:46px;border-radius:50%;border:none;background:var(--primary);color:#fff;cursor:pointer;box-shadow:var(--shadow-lg);transition:transform .2s,opacity .2s;z-index:60;display:grid;place-items:center}.back-top:hover{transform:translateY(-3px)}.toast{position:fixed;bottom:26px;left:50%;transform:translateX(-50%) translateY(20px);background:var(--ink);color:#fff;padding:12px 22px;border-radius:999px;font-size:14px;font-weight:500;box-shadow:var(--shadow-lg);opacity:0;transition:.25s;z-index:200}.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}@media (max-width:980px){.feature-grid{grid-template-columns:repeat(2,1fr)}}@media (max-width:680px){.site-nav{display:none}.feature-grid,.steps{grid-template-columns:1fr}.hero{padding:32px 0 24px}.cheatsheet,.faq,.features,.how,.tool{padding:56px 0}.footer-inner{flex-direction:column;text-align:center}.crop-toolbar{flex-direction:column;align-items:stretch}.crop-actions{justify-content:center}}@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}