*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;background:#f0f2f5;color:#1f2937;line-height:1.6;min-height:100vh}
a{text-decoration:none;color:inherit;transition:all .2s}
img{max-width:100%;height:auto}
.container{max-width:1200px;margin:0 auto;padding:0 20px}

/* 导航栏 */
.navbar{background:linear-gradient(135deg,#1e3a5f 0%,#0d2137 100%);position:sticky;top:0;z-index:1000;box-shadow:0 2px 20px rgba(0,0,0,.15)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.nav-logo{display:flex;align-items:center;gap:10px;font-size:20px;font-weight:700;color:#fff;letter-spacing:.5px}
.nav-logo svg{filter:drop-shadow(0 0 6px rgba(59,130,246,.5))}
.nav-menu{display:flex;align-items:center;gap:4px}
.nav-menu a{padding:8px 16px;border-radius:8px;font-size:14px;color:rgba(255,255,255,.75);font-weight:500}
.nav-menu a:hover{background:rgba(255,255,255,.1);color:#fff}
.nav-menu a.active{background:rgba(59,130,246,.25);color:#60a5fa}
.nav-toggle{display:none;background:none;border:none;color:#fff;font-size:22px;cursor:pointer;padding:4px 8px}

/* Hero */
.hero{background:linear-gradient(135deg,#1e3a5f 0%,#2563eb 50%,#1d4ed8 100%);position:relative;overflow:hidden;padding:60px 0 50px}
.hero::before{content:'';position:absolute;top:-50%;right:-20%;width:600px;height:600px;background:radial-gradient(circle,rgba(255,255,255,.06) 0%,transparent 70%);border-radius:50%}
.hero::after{content:'';position:absolute;bottom:-30%;left:-10%;width:400px;height:400px;background:radial-gradient(circle,rgba(96,165,250,.1) 0%,transparent 70%);border-radius:50%}
.hero .container{position:relative;z-index:1}
.hero-title{font-size:36px;font-weight:800;color:#fff;margin-bottom:14px;line-height:1.2;letter-spacing:-.5px}
.hero-title span{background:linear-gradient(135deg,#60a5fa,#34d399);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-desc{font-size:16px;color:rgba(255,255,255,.8);max-width:640px;margin-bottom:24px;line-height:1.7}
.hero-stats{display:flex;gap:40px;margin-bottom:28px}
.hero-stat{text-align:center}
.hero-stat-num{font-size:28px;font-weight:800;color:#fff;display:block}
.hero-stat-label{font-size:13px;color:rgba(255,255,255,.6);margin-top:2px}
.hero-tags{display:flex;gap:10px;flex-wrap:wrap}
.hero-tag{display:inline-flex;align-items:center;gap:6px;padding:8px 18px;background:rgba(255,255,255,.1);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.15);border-radius:100px;color:#fff;font-size:13px;font-weight:500;transition:all .3s}
.hero-tag:hover{background:rgba(255,255,255,.2);transform:translateY(-2px)}

/* 分类标签栏 */
.cat-bar{background:#fff;border-bottom:1px solid #e5e7eb;position:sticky;top:64px;z-index:100}
.cat-bar-inner{display:flex;gap:8px;padding:12px 0;overflow-x:auto;scrollbar-width:none}
.cat-bar-inner::-webkit-scrollbar{display:none}
.cat-tab{padding:8px 20px;border-radius:8px;font-size:14px;font-weight:500;color:#6b7280;cursor:pointer;border:1px solid transparent;transition:all .2s;white-space:nowrap}
.cat-tab:hover{color:#2563eb;background:#eff6ff}
.cat-tab.active{background:#2563eb;color:#fff;box-shadow:0 2px 8px rgba(37,99,235,.3)}

/* 分类区域 */
.section{padding:40px 0}
.section-header{display:flex;align-items:center;gap:12px;margin-bottom:28px}
.section-icon{width:40px;height:40px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:18px}
.section-title{font-size:22px;font-weight:700;color:#1f2937}
.section-count{font-size:13px;color:#9ca3af;background:#f3f4f6;padding:4px 12px;border-radius:20px}

/* 工具卡片网格 */
.tools-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:16px}
.tool-card{background:#fff;border:1px solid #e5e7eb;border-radius:14px;padding:20px;display:flex;gap:14px;align-items:flex-start;transition:all .25s;position:relative;overflow:hidden}
.tool-card::before{content:'';position:absolute;top:0;left:0;width:3px;height:100%;background:linear-gradient(180deg,#2563eb,#3b82f6);opacity:0;transition:opacity .25s}
.tool-card:hover{box-shadow:0 8px 30px rgba(0,0,0,.08);border-color:#bfdbfe;transform:translateY(-3px)}
.tool-card:hover::before{opacity:1}
.tool-icon-w{width:48px;height:48px;border-radius:12px;display:flex;align-items:center;justify-content:center;flex-shrink:0;font-size:22px;transition:transform .25s}
.tool-card:hover .tool-icon-w{transform:scale(1.1)}
.tool-info{flex:1;min-width:0}
.tool-name{font-size:15px;font-weight:600;color:#1f2937;margin-bottom:5px}
.tool-desc{font-size:13px;color:#6b7280;line-height:1.6}

/* 面包屑 */
.breadcrumb{padding:16px 0;font-size:13px;color:#6b7280}
.breadcrumb a{color:#2563eb}
.breadcrumb a:hover{text-decoration:underline}
.breadcrumb .sep{margin:0 8px;color:#d1d5db}

/* 工具页面 */
.tool-page{padding:24px 0 40px}
.tool-header{background:linear-gradient(135deg,#1e3a5f,#2563eb);border-radius:16px;padding:32px;margin-bottom:24px;color:#fff;position:relative;overflow:hidden}
.tool-header::before{content:'';position:absolute;top:-50%;right:-10%;width:300px;height:300px;background:radial-gradient(circle,rgba(255,255,255,.08) 0%,transparent 70%)}
.tool-header h1{font-size:26px;font-weight:700;margin-bottom:8px;position:relative}
.tool-header p{opacity:.85;font-size:14px;max-width:600px;position:relative}

/* 工具工作区 */
.tool-workspace{background:#fff;border:1px solid #e5e7eb;border-radius:16px;padding:32px;margin-bottom:24px;box-shadow:0 1px 3px rgba(0,0,0,.04)}

/* 内容区块 */
.content-box{background:#fff;border:1px solid #e5e7eb;border-radius:16px;padding:28px;margin-bottom:20px;max-width:1200px;margin-left:auto;margin-right:auto}
.content-box h2{font-size:18px;font-weight:700;color:#1f2937;margin-bottom:16px;padding-bottom:12px;border-bottom:2px solid #f3f4f6;display:flex;align-items:center;gap:8px}
.content-box h2::before{content:'';width:4px;height:20px;background:linear-gradient(180deg,#2563eb,#3b82f6);border-radius:2px}
.content-box p{color:#4b5563;font-size:14px;line-height:1.8;margin-bottom:12px}

/* 步骤 */
.steps-list{display:flex;flex-direction:column;gap:14px}
.step-item{display:flex;align-items:center;gap:14px}
.step-num{width:34px;height:34px;border-radius:50%;background:linear-gradient(135deg,#2563eb,#3b82f6);color:#fff;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:600;flex-shrink:0}
.step-text{font-size:14px;color:#4b5563}

/* FAQ */
.faq-item{padding:16px 0;border-bottom:1px solid #f3f4f6}
.faq-item:last-child{border-bottom:none;padding-bottom:0}
.faq-q{font-size:14px;font-weight:600;color:#1f2937;margin-bottom:6px;display:flex;gap:8px}
.faq-q::before{content:'Q';width:20px;height:20px;background:#dbeafe;color:#2563eb;border-radius:4px;display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:700;flex-shrink:0}
.faq-a{font-size:14px;color:#6b7280;line-height:1.7;padding-left:28px}

/* 相关工具 */
.related-grid{display:grid;grid-template:repeat(auto-fill,minmax(200px,1fr))/ gap:12px}
.rt-card{display:flex;gap:12px;padding:14px;border:1px solid #e5e7eb;border-radius:12px;transition:all .2s}
.rt-card:hover{border-color:#bfdbfe;box-shadow:0 4px 12px rgba(0,0,0,.06)}
.rt-icon-w{width:40px;height:40px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:18px;flex-shrink:0}
.rt-name{font-size:14px;font-weight:600;color:#1f2937;margin-bottom:2px}
.rt-desc{font-size:12px;color:#9ca3af}

/* 输入框和按钮 */
.form-input{width:100%;padding:12px 16px;border:1px solid #d1d5db;border-radius:10px;font-size:14px;transition:all .2s;background:#fafafa}
.form-input:focus{outline:none;border-color:#2563eb;background:#fff;box-shadow:0 0 0 3px rgba(37,99,235,.1)}
.form-select{width:100%;padding:12px 16px;border:1px solid #d1d5db;border-radius:10px;font-size:14px;background:#fafafa;cursor:pointer}
.btn-primary{display:inline-flex;align-items:center;justify-content:center;padding:12px 28px;background:linear-gradient(135deg,#2563eb,#1d4ed8);color:#fff;border:none;border-radius:10px;font-size:14px;font-weight:500;cursor:pointer;transition:all .2s}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 6px 20px rgba(37,99,235,.35)}
.btn-secondary{display:inline-flex;align-items:center;justify-content:center;padding:10px 24px;background:#f3f4f6;color:#374151;border:none;border-radius:10px;font-size:14px;font-weight:500;cursor:pointer;transition:all .2s}
.btn-secondary:hover{background:#e5e7eb}
.btn-success{background:linear-gradient(135deg,#059669,#047857)}
.btn-success:hover{box-shadow:0 6px 20px rgba(5,150,105,.35)}
.btn-danger{background:linear-gradient(135deg,#dc2626,#b91c1c)}
.btn-danger:hover{box-shadow:0 6px 20px rgba(220,38,38,.35)}

/* 表格 */
.data-table{width:100%;border-collapse:collapse;background:#fff;border-radius:12px;overflow:hidden;border:1px solid #e5e7eb}
.data-table th{background:#f8fafc;padding:14px 16px;text-align:left;font-size:13px;font-weight:600;color:#4b5563;border-bottom:1px solid #e5e7eb;white-space:nowrap}
.data-table td{padding:12px 16px;font-size:14px;color:#374151;border-bottom:1px solid #f3f4f6}
.data-table tr:hover td{background:#f8fafc}
.data-table tr:last-child td{border-bottom:none}

/* 分页 */
.pagination{display:flex;gap:6px;justify-content:center;margin-top:24px}
.pagination a,.pagination span{padding:8px 14px;border:1px solid #e5e7eb;border-radius:8px;font-size:14px;color:#4b5563;min-width:40px;text-align:center}
.pagination a:hover{border-color:#2563eb;color:#2563eb}
.pagination .current{background:#2563eb;color:#fff;border-color:#2563eb}

/* 页脚 */
.footer{background:#0f172a;color:#94a3b8;margin-top:40px}
.footer-top{padding:48px 0 32px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px}
.footer-brand .footer-logo{display:flex;align-items:center;gap:10px;font-size:18px;font-weight:700;color:#fff;margin-bottom:14px}
.footer-brand p{font-size:13px;line-height:1.8;color:#64748b}
.footer-col h4{font-size:14px;font-weight:600;color:#fff;margin-bottom:16px}
.footer-col a{display:block;font-size:13px;color:#94a3b8;margin-bottom:10px;transition:color .2s}
.footer-col a:hover{color:#60a5fa}
.footer-col p{font-size:13px;color:#64748b;margin-bottom:8px}
.footer-bottom{border-top:1px solid #1e293b;padding:20px 0;text-align:center;font-size:13px;color:#475569}

/* 返回顶部 */
.back-top{position:fixed;bottom:30px;right:30px;width:44px;height:44px;background:#2563eb;color:#fff;border:none;border-radius:50%;cursor:pointer;box-shadow:0 4px 12px rgba(37,99,235,.35);display:flex;align-items:center;justify-content:center;font-size:18px;opacity:0;visibility:hidden;transition:all .3s;z-index:999}
.back-top.show{opacity:1;visibility:visible}
.back-top:hover{transform:translateY(-3px);box-shadow:0 6px 20px rgba(37,99,235,.4)}

/* 广告位 */
.ad-slot{background:linear-gradient(135deg,#fef3c7,#fde68a);border:1px dashed #f59e0b;border-radius:10px;padding:12px;text-align:center;font-size:12px;color:#92400e;margin:16px 0}

/* 后台布局 */
.admin-body{background:#f1f5f9;min-height:100vh}
.admin-nav{background:#0f172a;position:fixed;top:0;left:0;width:240px;height:100vh;overflow-y:auto;z-index:100}
.admin-nav-header{padding:20px;border-bottom:1px solid #1e293b}
.admin-nav-header a{font-size:16px;font-weight:700;color:#fff;display:flex;align-items:center;gap:10px}
.admin-nav-menu{padding:12px}
.admin-nav-menu a{display:flex;align-items:center;gap:10px;padding:10px 14px;border-radius:8px;font-size:14px;color:#94a3b8;transition:all .2s;margin-bottom:2px}
.admin-nav-menu a:hover{background:#1e293b;color:#e2e8f0}
.admin-nav-menu a.active{background:#2563eb;color:#fff}
.admin-main{margin-left:240px;min-height:100vh}
.admin-top{background:#fff;border-bottom:1px solid #e2e8f0;padding:12px 24px;display:flex;align-items:center;justify-content:space-between;height:56px;position:sticky;top:0;z-index:50}
.admin-content{padding:24px}
.admin-card{background:#fff;border:1px solid #e2e8f0;border-radius:12px;padding:24px;margin-bottom:20px}
.admin-card-title{font-size:16px;font-weight:700;color:#1e2937;margin-bottom:16px;padding-bottom:12px;border-bottom:1px solid #f1f5f9}
.stat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px;margin-bottom:24px}
.stat-card{background:#fff;border:1px solid #e2e8f0;border-radius:12px;padding:20px}
.stat-label{font-size:13px;color:#6b7280;margin-bottom:6px}
.stat-value{font-size:28px;font-weight:800;color:#1f2937}
.stat-icon{width:40px;height:40px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:18px;margin-bottom:10px}

/* 响应式 */
@media(max-width:768px){
.container{padding:0 16px}
.nav-menu{display:none;position:absolute;top:64px;left:0;right:0;background:#0f172a;flex-direction:column;padding:8px 16px;gap:0}
.nav-menu.show{display:flex}
.nav-menu a{padding:10px;border-bottom:1px solid #1e293b}
.nav-toggle{display:block}
.hero-title{font-size:26px}
.hero{padding:40px 0 32px}
.hero-stats{gap:24px}
.tools-grid{grid-template-columns:1fr}
.footer-grid{grid-template-columns:1fr;gap:24px}
.admin-nav{width:100%;height:auto;position:relative}
.admin-main{margin-left:0}
.tool-header h1{font-size:20px}
.related-grid{grid-template-columns:1fr}
.form-row{grid-template-columns:1fr}
.cat-bar{top:0;position:relative}
}

/* ===== 工具页面通用样式 ===== */
.btn-group{display:flex;gap:10px;flex-wrap:wrap;margin:15px 0}
.btn-ghost{display:inline-flex;align-items:center;justify-content:center;padding:10px 24px;background:#fff;color:#6b7280;border:1px solid #d1d5db;border-radius:10px;font-size:14px;font-weight:500;cursor:pointer;transition:all .2s}
.btn-ghost:hover{background:#f3f4f6;color:#374151}
.btn-copy{display:inline-flex;align-items:center;justify-content:center;padding:10px 24px;background:#f0fdf4;color:#15803d;border:1px solid #bbf7d0;border-radius:10px;font-size:14px;font-weight:500;cursor:pointer;transition:all .2s}
.btn-copy:hover{background:#dcfce7}
.input-section{margin-bottom:20px}
.input-section label{display:block;font-size:14px;font-weight:600;color:#374151;margin-bottom:8px}
.input-section textarea{width:100%;min-height:160px;padding:14px;border:1px solid #d1d5db;border-radius:10px;font-size:14px;font-family:inherit;resize:vertical;transition:all .2s;line-height:1.6}
.input-section textarea:focus{outline:none;border-color:#2563eb;background:#fff;box-shadow:0 0 0 3px rgba(37,99,235,.1)}
.input-section input[type="text"],.input-section input[type="number"]{padding:12px 16px;border:1px solid #d1d5db;border-radius:10px;font-size:14px;transition:all .2s}
.input-section input:focus{outline:none;border-color:#2563eb;box-shadow:0 0 0 3px rgba(37,99,235,.1)}
.output-section{margin-top:20px}
.output-section label{display:block;font-size:14px;font-weight:600;color:#374151;margin-bottom:8px}
.output-section textarea{width:100%;min-height:140px;padding:14px;border:1px solid #d1d5db;border-radius:10px;font-size:14px;font-family:monospace;background:#fafafa;resize:vertical;line-height:1.5}
.output-section input[type="text"]{width:100%;padding:10px 14px;border:1px solid #d1d5db;border-radius:8px;font-family:monospace;font-size:13px;background:#fafafa}
.tips-box{background:#f8fafc;border:1px solid #e2e8f0;border-radius:12px;padding:20px;margin:20px 0}
.tips-box h4{font-size:15px;font-weight:600;color:#1e293b;margin-bottom:12px;display:flex;align-items:center;gap:8px}
.tips-box ul{list-style:none;padding:0;margin:0}
.tips-box ul li{position:relative;padding-left:18px;font-size:13px;color:#4b5563;line-height:1.8;margin-bottom:4px}
.tips-box ul li::before{content:"";position:absolute;left:0;top:10px;width:6px;height:6px;background:#2563eb;border-radius:50%}
.tips-box strong{color:#1e293b}
.status-msg{display:inline-block;margin-left:10px;font-size:13px;color:#28a750;font-weight:500}
.extra-section{background:#fff;border:1px solid #e5e7eb;border-radius:12px;padding:24px;margin:20px 0}
.extra-section h3{font-size:16px;font-weight:600;color:#1e293b;margin-bottom:14px}
.section h3{font-size:18px;font-weight:700;color:#1e293b;margin-bottom:16px}
.faq-item{padding:14px 0;border-bottom:1px solid #f1f5f9}
.faq-item:last-child{border-bottom:none}
.faq-q{font-size:14px;font-weight:600;color:#1e293b;margin-bottom:6px}
.faq-a{font-size:14px;color:#64748b;line-height:1.7}
.rel-links{display:flex;gap:10px;flex-wrap:wrap}
.rel-link{display:inline-flex;padding:8px 16px;background:#f1f5f9;border-radius:8px;font-size:13px;color:#475569;transition:all .2s}
.rel-link:hover{background:#dbeafe;color:#2563eb}
.tool-about p{font-size:14px;color:#4b5563;line-height:1.8}
.tool-faq,.tool-related,.tool-about{background:#fff;border:1px solid #e5e7eb;border-radius:16px;padding:28px;margin-bottom:20px}

/* 打印 */
@media print{.navbar,.footer,.back-top,.cat-bar,.ad-slot{display:none}.tool-page{padding-top:20px}}