/* ===== 轻工具箱 全站样式 ===== */
:root{
  --primary:#2563eb;
  --primary-dark:#1d4ed8;
  --primary-light:#dbeafe;
  --text:#1f2937;
  --text-light:#6b7280;
  --border:#e5e7eb;
  --bg:#f8fafc;
  --white:#fff;
  --success:#16a34a;
  --danger:#dc2626;
  --warning:#d97706;
  --radius:10px;
  --shadow:0 1px 3px rgba(0,0,0,.08),0 1px 2px rgba(0,0,0,.04);
  --shadow-lg:0 10px 25px rgba(0,0,0,.1);
  --maxw:1180px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  color:var(--text);background:var(--bg);line-height:1.6;font-size:15px;
  display:flex;flex-direction:column;min-height:100vh;
}
a{color:var(--primary);text-decoration:none}
a:hover{color:var(--primary-dark)}
img{max-width:100%}
h1,h2,h3,h4{line-height:1.3;color:var(--text)}
.container{max-width:var(--maxw);margin:0 auto;padding:0 16px;width:100%}
main{flex:1;padding:24px 0 40px}

/* ===== 顶部导航 ===== */
.site-header{background:var(--white);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100;box-shadow:var(--shadow)}
.header-inner{display:flex;align-items:center;gap:16px;height:60px;max-width:var(--maxw);margin:0 auto;padding:0 16px}
.logo{display:flex;align-items:center;gap:8px;font-size:19px;font-weight:700;color:var(--primary);white-space:nowrap}
.logo:hover{color:var(--primary-dark)}
.logo .logo-icon{width:32px;height:32px;background:var(--primary);color:#fff;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:18px}
.main-nav{display:flex;gap:4px;margin-left:8px}
.main-nav a{padding:7px 12px;border-radius:6px;color:var(--text);font-size:14px;font-weight:500}
.main-nav a:hover,.main-nav a.active{background:var(--primary-light);color:var(--primary-dark)}
.header-search{margin-left:auto;display:flex;align-items:center;gap:10px}
.search-btn{display:flex;align-items:center;gap:8px;background:var(--bg);border:1px solid var(--border);border-radius:20px;padding:8px 14px;cursor:pointer;color:var(--text-light);font-size:14px;min-width:200px;font-family:inherit}
.search-btn:hover{border-color:var(--primary);color:var(--primary)}
.search-btn kbd{margin-left:auto;font-size:11px;background:#fff;border:1px solid var(--border);border-radius:4px;padding:1px 6px;color:var(--text-light)}
.nav-toggle{display:none;background:none;border:none;font-size:24px;cursor:pointer;color:var(--text);padding:4px 8px;margin-left:auto}

/* ===== 搜索弹层 ===== */
.search-overlay{position:fixed;inset:0;background:rgba(15,23,42,.45);z-index:200;display:none;align-items:flex-start;justify-content:center;padding:80px 16px 0}
.search-overlay.show{display:flex}
.search-box{background:var(--white);border-radius:12px;width:100%;max-width:560px;box-shadow:var(--shadow-lg);overflow:hidden}
.search-box input{width:100%;border:none;border-bottom:1px solid var(--border);padding:16px 18px;font-size:16px;outline:none;font-family:inherit}
.search-results{max-height:50vh;overflow-y:auto}
.search-results .sr-item{display:flex;align-items:center;gap:12px;padding:11px 18px;cursor:pointer;color:var(--text)}
.search-results .sr-item:hover,.search-results .sr-item.sel{background:var(--primary-light)}
.sr-item .sr-icon{font-size:20px;width:28px;text-align:center}
.sr-item .sr-name{font-weight:500;font-size:14px}
.sr-item .sr-desc{font-size:12px;color:var(--text-light)}
.search-empty{padding:24px;text-align:center;color:var(--text-light);font-size:14px}

/* ===== 面包屑 ===== */
.breadcrumb{font-size:13px;color:var(--text-light);margin-bottom:14px;display:flex;flex-wrap:wrap;gap:4px}
.breadcrumb a{color:var(--text-light)}
.breadcrumb a:hover{color:var(--primary)}
.breadcrumb .sep{color:#cbd5e1}

/* ===== 首页 Hero ===== */
.hero{background:linear-gradient(135deg,#2563eb,#1e40af);color:#fff;padding:48px 0 44px;text-align:center}
.hero h1{color:#fff;font-size:32px;margin-bottom:12px}
.hero p{font-size:16px;opacity:.92;max-width:640px;margin:0 auto 26px}
.hero-search{max-width:620px;margin:0 auto;position:relative}
.hero-search input{width:100%;padding:15px 20px;border-radius:30px;border:none;font-size:16px;box-shadow:var(--shadow-lg);outline:none;font-family:inherit}
.hero-search-results{position:absolute;top:60px;left:0;right:0;background:#fff;border-radius:12px;box-shadow:var(--shadow-lg);text-align:left;overflow:hidden;display:none;z-index:50}
.hero-search-results.show{display:block}
.hero-badges{display:flex;gap:22px;justify-content:center;margin-top:22px;flex-wrap:wrap;font-size:13px;opacity:.9}
.hero-badges span::before{content:"✓ ";font-weight:700}

/* ===== 区块标题 ===== */
.section{margin-top:36px}
.section-head{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:16px;gap:10px}
.section-head h2{font-size:21px}
.section-head .more{font-size:13px;white-space:nowrap}
.section-desc{color:var(--text-light);font-size:13px;margin-bottom:14px}

/* ===== 工具卡片网格 ===== */
.tool-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:14px}
.tool-card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);padding:16px;display:flex;gap:12px;align-items:flex-start;transition:box-shadow .15s,transform .15s,border-color .15s;color:var(--text)}
.tool-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-2px);border-color:var(--primary-light);color:var(--text)}
.tool-card .tc-icon{width:42px;height:42px;border-radius:9px;background:var(--primary-light);display:flex;align-items:center;justify-content:center;font-size:21px;flex-shrink:0}
.tool-card .tc-name{font-weight:600;font-size:14.5px;margin-bottom:2px}
.tool-card .tc-desc{font-size:12.5px;color:var(--text-light);line-height:1.5}

/* ===== 广告位 ===== */
.ad-slot{background:repeating-linear-gradient(45deg,#f1f5f9,#f1f5f9 10px,#f8fafc 10px,#f8fafc 20px);border:1px dashed #cbd5e1;border-radius:var(--radius);display:flex;align-items:center;justify-content:center;color:#94a3b8;font-size:12px;letter-spacing:1px;margin:18px 0;overflow:hidden;min-height:90px}
.ad-slot.ad-leaderboard{height:90px}
.ad-slot.ad-banner{height:100px}
.ad-slot.ad-rect{height:250px}
.ad-slot.ad-skyscraper{height:600px}
.ad-slot.ad-mobile{display:none;height:60px}
.ad-slot.ad-infeed{grid-column:1/-1;height:90px;margin:0}
.ad-slot.ad-live{background:#f0fdf4;border-color:#bbf7d0;color:#16a34a;background-image:none}
.layout-sidebar .ad-slot{margin:0 0 16px;position:sticky;top:76px}

/* ===== 工具页布局 ===== */
.tool-page-head h1{font-size:25px;margin-bottom:8px}
.tool-page-head .tool-lead{color:var(--text-light);font-size:14px;max-width:760px}
.layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:24px;margin-top:20px;align-items:start}
.layout-sidebar{display:flex;flex-direction:column}
.tool-workspace{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}
.tool-workspace h2{font-size:16px;margin-bottom:12px}

/* ===== 通用控件 ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:9px 18px;border-radius:8px;border:1px solid var(--border);background:var(--white);color:var(--text);font-size:14px;font-weight:500;cursor:pointer;font-family:inherit;transition:background .15s,border-color .15s;line-height:1.4}
.btn:hover{border-color:var(--primary);color:var(--primary)}
.btn-primary{background:var(--primary);border-color:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-dark);border-color:var(--primary-dark);color:#fff}
.btn-success{background:var(--success);border-color:var(--success);color:#fff}
.btn-success:hover{background:#15803d;color:#fff}
.btn-danger{background:var(--danger);border-color:var(--danger);color:#fff}
.btn:disabled{opacity:.55;cursor:not-allowed}
.btn-sm{padding:6px 12px;font-size:13px}
.btn-lg{padding:12px 26px;font-size:15px}
.btn-row{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin-top:14px}
input[type=text],input[type=number],input[type=password],input[type=date],input[type=email],select,textarea{
  width:100%;padding:9px 12px;border:1px solid var(--border);border-radius:8px;font-size:14px;font-family:inherit;background:#fff;color:var(--text);outline:none;
}
input:focus,select:focus,textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.12)}
textarea{resize:vertical;line-height:1.55}
label{font-size:13.5px;font-weight:500;display:block;margin-bottom:5px;color:var(--text)}
.field{margin-bottom:14px}
.field-row{display:flex;gap:14px;flex-wrap:wrap}
.field-row .field{flex:1;min-width:140px}
.form-inline{display:flex;gap:10px;flex-wrap:wrap;align-items:flex-end}
.form-inline .field{margin-bottom:0;flex:1;min-width:120px}
.hint{font-size:12.5px;color:var(--text-light);margin-top:4px}
.checkbox-row{display:flex;align-items:center;gap:7px;font-size:14px;margin-bottom:10px}
.checkbox-row input{width:auto;margin:0}
.checkbox-row label{margin:0;font-weight:400}

/* 上传区 */
.upload-zone{border:2px dashed var(--border);border-radius:var(--radius);padding:34px 18px;text-align:center;cursor:pointer;transition:border-color .15s,background .15s;color:var(--text-light)}
.upload-zone:hover,.upload-zone.dragover{border-color:var(--primary);background:var(--primary-light);color:var(--primary-dark)}
.upload-zone .uz-icon{font-size:38px;display:block;margin-bottom:8px}
.upload-zone .uz-text{font-size:14.5px;font-weight:500}
.upload-zone .uz-sub{font-size:12.5px;margin-top:4px}
.file-list{margin-top:14px;display:flex;flex-direction:column;gap:8px}
.file-item{display:flex;align-items:center;gap:10px;background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:8px 12px;font-size:13px}
.file-item .fi-name{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.file-item .fi-size{color:var(--text-light);font-size:12px;white-space:nowrap}
.file-item .fi-remove{background:none;border:none;color:var(--text-light);cursor:pointer;font-size:16px;padding:0 4px}
.file-item .fi-remove:hover{color:var(--danger)}

/* 结果/消息 */
.result-box{margin-top:16px}
.result-preview{border:1px solid var(--border);border-radius:8px;padding:14px;background:var(--bg);margin-top:12px;text-align:center}
.result-preview img{max-height:340px;border-radius:6px}
.msg{padding:10px 14px;border-radius:8px;font-size:13.5px;margin-top:12px;display:none}
.msg.show{display:block}
.msg-info{background:#eff6ff;color:#1e40af;border:1px solid #bfdbfe}
.msg-success{background:#f0fdf4;color:#166534;border:1px solid #bbf7d0}
.msg-error{background:#fef2f2;color:#991b1b;border:1px solid #fecaca}
.msg-warn{background:#fffbeb;color:#92400e;border:1px solid #fde68a}

/* 表格 */
table.data-table{width:100%;border-collapse:collapse;font-size:13.5px;margin-top:10px}
.data-table th,.data-table td{border:1px solid var(--border);padding:8px 10px;text-align:left}
.data-table th{background:var(--bg);font-weight:600}

/* 统计数字 */
.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:10px;margin-top:12px}
.stat-item{background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:12px;text-align:center}
.stat-item .si-num{font-size:22px;font-weight:700;color:var(--primary)}
.stat-item .si-label{font-size:12px;color:var(--text-light);margin-top:2px}

/* 标签页 */
.tabs{display:flex;gap:4px;border-bottom:1px solid var(--border);margin-bottom:14px;flex-wrap:wrap}
.tabs button{background:none;border:none;padding:9px 16px;cursor:pointer;font-size:14px;color:var(--text-light);border-bottom:2px solid transparent;font-family:inherit;font-weight:500}
.tabs button.active{color:var(--primary);border-bottom-color:var(--primary)}
.tab-pane{display:none}
.tab-pane.active{display:block}

/* 调色色块 */
.swatch-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}
.swatch{width:42px;height:42px;border-radius:8px;border:1px solid var(--border);cursor:pointer;position:relative}
.swatch span{position:absolute;bottom:-18px;left:50%;transform:translateX(-50%);font-size:10px;color:var(--text-light);white-space:nowrap}

/* SEO 内容区 */
.seo-content{margin-top:34px;background:var(--white);border:1px solid var(--border);border-radius:var(--radius);padding:24px}
.seo-content h2{font-size:18px;margin:18px 0 8px}
.seo-content h2:first-child{margin-top:0}
.seo-content p,.seo-content li{color:#374151;font-size:14px;margin-bottom:8px}
.seo-content ul,.seo-content ol{padding-left:22px;margin-bottom:10px}
.faq details{border:1px solid var(--border);border-radius:8px;padding:12px 16px;margin-bottom:8px;background:var(--white)}
.faq summary{cursor:pointer;font-weight:600;font-size:14px;list-style:none;display:flex;justify-content:space-between;align-items:center}
.faq summary::after{content:"+";font-size:20px;color:var(--text-light)}
.faq details[open] summary::after{content:"−"}
.faq details p{margin-top:8px;font-size:13.5px;color:var(--text-light)}

/* 相关工具 */
.related-tools{margin-top:30px}

/* ===== 辅助页面 ===== */
.page-card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow);max-width:860px;margin:0 auto}
.page-card h1{font-size:24px;margin-bottom:16px}
.page-card h2{font-size:17px;margin:20px 0 8px}
.page-card p,.page-card li{font-size:14px;color:#374151;margin-bottom:8px}
.page-card ul{padding-left:22px}

/* ===== Footer ===== */
.site-footer{background:#0f172a;color:#94a3b8;font-size:13px;padding:34px 0 22px;margin-top:auto}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:26px;max-width:var(--maxw);margin:0 auto;padding:0 16px}
.footer-col h4{color:#e2e8f0;font-size:14px;margin-bottom:10px}
.footer-col a{color:#94a3b8;display:block;padding:3px 0;font-size:13px}
.footer-col a:hover{color:#fff}
.footer-about{font-size:12.5px;line-height:1.7}
.footer-bottom{text-align:center;border-top:1px solid #1e293b;margin-top:24px;padding-top:16px;font-size:12px}

/* ===== 响应式 ===== */
@media (max-width:1024px){
  .layout{grid-template-columns:1fr}
  .layout-sidebar{display:none}
  .ad-slot.ad-mobile{display:flex}
}
@media (max-width:768px){
  .main-nav{display:none;position:absolute;top:60px;left:0;right:0;background:#fff;flex-direction:column;padding:10px 16px;border-bottom:1px solid var(--border);box-shadow:var(--shadow-lg);margin-left:0}
  .main-nav.show{display:flex}
  .main-nav a{padding:11px 12px}
  .nav-toggle{display:block}
  .search-btn{min-width:0;padding:8px 12px}
  .search-btn .search-btn-text,.search-btn kbd{display:none}
  .hero{padding:36px 0 32px}
  .hero h1{font-size:24px}
  .hero p{font-size:14px}
  .tool-grid{grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:10px}
  .tool-card{padding:12px;flex-direction:column;gap:8px}
  .tool-card .tc-icon{width:36px;height:36px;font-size:18px}
  .ad-slot.ad-leaderboard{height:70px}
  .tool-workspace{padding:15px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:20px}
  .tool-page-head h1{font-size:21px}
  .seo-content{padding:18px}
  .page-card{padding:20px}
}
@media (max-width:420px){
  .tool-grid{grid-template-columns:1fr 1fr}
  .footer-grid{grid-template-columns:1fr}
}