*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:#1f2937;background:#f8fafc;line-height:1.7;-webkit-font-smoothing:antialiased}
.container{max-width:960px;margin:0 auto;padding:0 20px}
a{color:#2563eb}

/* 导航 */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.95);backdrop-filter:blur(8px);border-bottom:1px solid #e5e7eb}
.nav-inner{height:60px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.logo{display:flex;align-items:center;gap:9px;font-weight:800;font-size:18px;color:#0f172a;text-decoration:none}
.logo-mark{width:32px;height:32px;border-radius:8px;background:linear-gradient(135deg,#2563eb,#1d4ed8);color:#fff;display:flex;align-items:center;justify-content:center;font-size:16px;font-weight:700}
.nav-links{display:flex;gap:18px}
.nav-links a{color:#475569;text-decoration:none;font-size:14px;white-space:nowrap}
.nav-links a:hover{color:#2563eb}
.nav-links a.active{color:#2563eb;font-weight:600}

/* 首页 hero */
.hero{background:linear-gradient(135deg,#0b1e4b,#123a8f 60%,#1d4ed8);color:#fff;padding:64px 0 56px;text-align:center}
.hero h1{font-size:36px;letter-spacing:1px}
.hero p{margin:14px auto 26px;max-width:640px;color:#c7d5f5;font-size:16px;padding:0 20px}
.chip-row{display:flex;gap:10px;justify-content:center;flex-wrap:wrap}
.chip{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.16);padding:7px 14px;border-radius:999px;font-size:13px}

main.container{padding-top:34px;padding-bottom:20px}

/* 工具页头部 */
.tool-head{text-align:center;margin-bottom:22px}
.tool-head h1{font-size:28px;color:#0f172a}
.tool-sub{color:#64748b;margin-top:8px;font-size:15px}
.tool-sub strong{color:#16a34a}

/* 工具面板 */
.panel{background:#fff;border:1px solid #e5e7eb;border-radius:16px;padding:26px;box-shadow:0 1px 3px rgba(16,24,40,.06)}
.dropzone{border:2px dashed #cbd5e1;border-radius:12px;padding:42px 20px;text-align:center;color:#64748b;cursor:pointer;transition:.15s}
.dropzone:hover,.dropzone.dragover{border-color:#2563eb;background:#eff6ff;color:#2563eb}
.dz-icon{font-size:34px;margin-bottom:8px}
.dz-hint{font-size:13px;color:#94a3b8;margin-top:6px}

.options{display:flex;flex-wrap:wrap;gap:18px;margin-top:18px;align-items:center}
.opt{display:flex;align-items:center;gap:8px;font-size:14px;color:#475569}
.opt select,.opt input[type=number]{padding:8px 10px;border:1px solid #d1d5db;border-radius:8px;font-size:14px;background:#fff;color:#1f2937}
.opt input[type=range]{width:140px;accent-color:#2563eb}
.opt .val{min-width:40px;color:#2563eb;font-weight:600}

.actions{display:flex;align-items:center;gap:14px;margin-top:20px;flex-wrap:wrap}
.btn{display:inline-block;padding:11px 24px;border-radius:10px;font-weight:600;font-size:15px;border:none;cursor:pointer;text-decoration:none;transition:.15s}
.btn-primary{background:#2563eb;color:#fff}
.btn-primary:hover{background:#1d4ed8}
.btn-primary:disabled{background:#94a3b8;cursor:not-allowed}
.btn-sm{padding:7px 14px;font-size:13px;border-radius:8px}
.btn-ghost{border:1px solid #d1d5db;background:#fff;color:#475569}
.btn-ghost:hover{border-color:#2563eb;color:#2563eb}
.status{font-size:13px;color:#64748b}

.results{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:14px;margin-top:22px}
.result-card{background:#f8fafc;border:1px solid #e5e7eb;border-radius:12px;padding:12px;text-align:center}
.result-thumb{height:110px;display:flex;align-items:center;justify-content:center;background:#fff;border:1px solid #eef2f7;border-radius:8px;overflow:hidden;margin-bottom:8px}
.result-thumb img{max-width:100%;max-height:100%;object-fit:contain}
.result-name{font-size:13px;color:#334155;word-break:break-all;overflow:hidden;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}
.result-meta{font-size:12px;color:#94a3b8;margin:4px 0 8px}

/* 工具卡片（首页/相关工具） */
.tool-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:8px}
.tool-card{background:#fff;border:1px solid #e5e7eb;border-radius:14px;padding:22px;text-decoration:none;color:inherit;transition:.15s;display:block}
.tool-card:hover{border-color:#2563eb;box-shadow:0 6px 18px rgba(37,99,235,.1);transform:translateY(-2px)}
.tool-card .icon{font-size:28px}
.tool-card h3{font-size:16px;color:#0f172a;margin:8px 0 4px}
.tool-card p{font-size:13px;color:#64748b}

/* SEO 内容块 */
.seo-block{margin-top:36px}
.seo-block h2{font-size:20px;color:#0f172a;margin-bottom:14px}
.seo-block p,.seo-block li{font-size:14px;color:#475569}
.seo-block ol,.seo-block ul{padding-left:22px}
.seo-block li{margin:6px 0}
details{background:#fff;border:1px solid #e5e7eb;border-radius:12px;padding:14px 18px;margin-bottom:10px}
summary{cursor:pointer;font-weight:600;color:#0f172a;font-size:14px}
details p{margin-top:8px;font-size:14px;color:#475569}

/* 首页信任区 */
.trust{display:flex;gap:14px;flex-wrap:wrap;margin-top:20px}
.t-item{flex:1 1 240px;background:#fff;border:1px solid #e5e7eb;border-radius:14px;padding:18px}
.t-item h3{font-size:15px;color:#0f172a;margin-bottom:6px}
.t-item p{font-size:13px;color:#64748b}

footer{background:#0f172a;color:#94a3b8;padding:26px 0;font-size:13px;text-align:center;margin-top:48px}
footer a{color:#94a3b8}

/* 二维码工具 */
.qr-stage{display:flex;gap:26px;flex-wrap:wrap;margin-top:20px}
.qr-box{flex:0 0 auto;background:#fff;border:1px solid #e5e7eb;border-radius:12px;padding:18px;min-width:240px;min-height:240px;display:flex;align-items:center;justify-content:center}
.qr-box canvas,.qr-box img{display:block;image-rendering:pixelated}
.qr-form{flex:1 1 320px}
.qr-form textarea{width:100%;min-height:130px;padding:12px;border:1px solid #d1d5db;border-radius:10px;font-size:14px;font-family:inherit;resize:vertical}
.qr-form .hint{font-size:12px;color:#94a3b8;margin-top:6px}

@media(max-width:760px){
  .nav-links{display:none}
  .hero h1{font-size:26px}
  .tool-grid{grid-template-columns:1fr 1fr}
  .panel{padding:18px}
}
@media(max-width:480px){.tool-grid{grid-template-columns:1fr}}