*{margin:0;padding:0;box-sizing:border-box}
:root{--blue:#2563eb;--blue-dark:#1d4ed8;--blue-light:#dbeafe;--white:#fff;--gray:#64748b;--bg:#f0f6ff;--border:#bfdbfe}
body{font-family:'Segoe UI',system-ui,-apple-system,sans-serif;background:var(--bg);color:#1e293b;min-height:100vh}
.topbar{background:var(--white);border-bottom:2px solid var(--border);padding:12px 20px;display:flex;align-items:center;gap:16px;position:sticky;top:0;z-index:100;box-shadow:0 2px 8px rgba(37,99,235,.08)}
.back-btn{display:inline-flex;align-items:center;gap:8px;background:var(--blue);color:var(--white);text-decoration:none;padding:9px 18px;border-radius:8px;font-size:14px;font-weight:600;transition:.2s;white-space:nowrap}
.back-btn:hover{background:var(--blue-dark)}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none}
.brand .logo{width:36px;height:36px;background:var(--blue);border-radius:9px;display:flex;align-items:center;justify-content:center;color:#fff;font-size:18px}
.brand h1{font-size:20px;color:var(--blue-dark);font-weight:700}
.nav{margin-left:auto;display:flex;gap:6px;flex-wrap:wrap}
.nav a{padding:7px 14px;border-radius:8px;text-decoration:none;font-size:13px;font-weight:600;color:var(--blue-dark);transition:.2s}
.nav a:hover,.nav a.active{background:var(--blue-light)}
.wrap{max-width:960px;margin:0 auto;padding:28px 16px 60px}
.hero{text-align:center;padding:34px 16px 30px}
.hero h2{font-size:30px;color:var(--blue-dark);margin-bottom:10px}
.hero p{color:var(--gray);font-size:16px;max-width:600px;margin:0 auto}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:18px;margin-top:26px}
.tool-card{background:var(--white);border:2px solid var(--border);border-radius:14px;padding:26px 18px;text-align:center;text-decoration:none;color:#1e293b;transition:.2s;box-shadow:0 4px 14px rgba(37,99,235,.06)}
.tool-card:hover{transform:translateY(-4px);border-color:var(--blue);box-shadow:0 10px 24px rgba(37,99,235,.15)}
.tool-card .ico{width:64px;height:64px;margin:0 auto 14px;background:var(--blue-light);border-radius:16px;display:flex;align-items:center;justify-content:center;font-size:30px}
.tool-card h3{font-size:16px;color:var(--blue-dark);margin-bottom:6px}
.tool-card p{font-size:13px;color:var(--gray);line-height:1.5}
.features{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:14px;margin-top:34px}
.feature{background:var(--white);border:1px solid var(--border);border-radius:12px;padding:16px;text-align:center;font-size:13px;color:var(--gray)}
.feature b{display:block;color:var(--blue-dark);font-size:15px;margin-bottom:4px}
footer{text-align:center;padding:24px 16px;color:var(--gray);font-size:13px;border-top:1px solid var(--border);background:var(--white)}
footer a{color:var(--blue);font-weight:600;text-decoration:none}

/* Tool page */
.tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:24px}
.tab{flex:1;min-width:140px;padding:13px 10px;background:var(--white);border:2px solid var(--border);border-radius:10px;cursor:pointer;font-size:14px;font-weight:600;color:var(--blue-dark);text-align:center;transition:.2s;text-decoration:none}
.tab:hover{background:var(--blue-light)}
.tab.active{background:var(--blue);color:var(--white);border-color:var(--blue)}
.panel{display:none;background:var(--white);border:2px solid var(--border);border-radius:14px;padding:28px 24px;box-shadow:0 4px 16px rgba(37,99,235,.07)}
.panel.active{display:block}
.panel h2{color:var(--blue-dark);font-size:20px;margin-bottom:6px}
.panel .desc{color:var(--gray);font-size:14px;margin-bottom:22px}
.dropzone{border:2px dashed var(--blue);border-radius:12px;background:var(--bg);padding:44px 20px;text-align:center;cursor:pointer;transition:.2s;display:block}
.dropzone:hover,.dropzone.over{background:var(--blue-light);border-color:var(--blue-dark)}
.dropzone .icon{font-size:44px;margin-bottom:10px}
.dropzone p{color:var(--gray);font-size:14px}
.dropzone p b{color:var(--blue-dark)}
input[type=file]{display:none}
.opts{margin-top:20px;display:flex;flex-direction:column;gap:16px}
.opt-row{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.opt-row label{font-size:14px;font-weight:600;color:#334155;min-width:130px}
input[type=range]{flex:1;min-width:140px;accent-color:var(--blue)}
select,input[type=number]{padding:8px 12px;border:2px solid var(--border);border-radius:8px;font-size:14px;background:var(--white);color:#1e293b}
select:focus,input[type=number]:focus{outline:none;border-color:var(--blue)}
.val{font-weight:700;color:var(--blue-dark);min-width:52px}
.chk{display:flex;align-items:center;gap:8px;font-size:14px;cursor:pointer}
.chk input{accent-color:var(--blue);width:17px;height:17px}
.preview-box{margin-top:22px;display:none;gap:20px;flex-wrap:wrap}
.preview-box.show{display:flex}
.card{flex:1;min-width:240px;background:var(--bg);border:1px solid var(--border);border-radius:12px;padding:14px;text-align:center}
.card h3{font-size:14px;color:var(--blue-dark);margin-bottom:10px}
.card img{max-width:100%;max-height:220px;border-radius:8px;background:var(--white);border:1px solid var(--border)}
.card .meta{font-size:13px;color:var(--gray);margin-top:8px}
.actions{margin-top:22px;display:flex;gap:12px;flex-wrap:wrap}
.btn{padding:12px 26px;border:none;border-radius:9px;font-size:15px;font-weight:700;cursor:pointer;transition:.2s;text-decoration:none;display:inline-flex;align-items:center;gap:8px}
.btn-primary{background:var(--blue);color:var(--white)}
.btn-primary:hover{background:var(--blue-dark)}
.btn-primary:disabled{background:#94a3b8;cursor:not-allowed}
.btn-success{background:#16a34a;color:var(--white)}
.btn-success:hover{background:#15803d}
.status{margin-top:16px;padding:12px 16px;border-radius:8px;font-size:14px;font-weight:600;display:none}
.status.ok{display:block;background:#dcfce7;color:#166534;border:1px solid #86efac}
.status.err{display:block;background:#fee2e2;color:#991b1b;border:1px solid #fca5a5}
.info{margin-top:14px;font-size:13px;color:var(--blue-dark);background:var(--blue-light);padding:10px 14px;border-radius:8px;display:none}
.info.show{display:block}
@media(max-width:640px){
.topbar{flex-wrap:wrap;gap:10px;padding:10px 14px}
.brand h1{font-size:17px}
.back-btn{padding:8px 14px;font-size:13px}
.nav{margin-left:0;width:100%;justify-content:flex-start}
.hero h2{font-size:23px}
.tabs{gap:6px}
.tab{min-width:calc(50% - 4px);padding:11px 6px;font-size:13px}
.panel{padding:20px 16px}
.panel h2{font-size:17px}
.dropzone{padding:32px 14px}
.dropzone .icon{font-size:38px}
.opt-row label{min-width:100%;font-size:13px}
.card{min-width:100%}
.btn{width:100%;justify-content:center}
}