/* ============================================================
   5ilr 工具站 - 统一样式系统 v2
   字体：微软雅黑，无需加载外部字体
   ============================================================ */
:root {
  --brand:        #2563eb;
  --brand-dark:   #1d4ed8;
  --brand-light:  #eff6ff;
  --bg:           #f8fafc;
  --bg-white:     #ffffff;
  --border:       #e2e8f0;
  --border-focus: #93c5fd;
  --text:         #0f172a;
  --text-sub:     #475569;
  --text-muted:   #94a3b8;
  --radius-sm:    8px;
  --radius:       12px;
  --radius-lg:    16px;
  --shadow:       0 1px 3px rgba(0,0,0,0.07), 0 4px 16px rgba(0,0,0,0.05);
  --shadow-md:    0 4px 6px rgba(0,0,0,0.07), 0 10px 30px rgba(0,0,0,0.08);
  --tr:           0.18s ease;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "Microsoft YaHei","微软雅黑","PingFang SC","苹方","Hiragino Sans GB",sans-serif;
  background: var(--bg); color: var(--text);
  line-height: 1.6; min-height: 100vh; -webkit-font-smoothing: antialiased;
}
a { color: var(--brand); text-decoration: none; transition: color var(--tr); }
a:hover { color: var(--brand-dark); }
.container      { max-width: 860px;  margin: 0 auto; padding: 0 20px; }
.container-wide { max-width: 1100px; margin: 0 auto; padding: 0 20px; }

/* Header */
.site-header {
  background:#fff; border-bottom:1px solid var(--border);
  position:sticky; top:0; z-index:100;
}
.header-inner {
  max-width:1100px; margin:0 auto; height:58px;
  display:flex; align-items:center; justify-content:space-between;
  padding:0 20px; gap:16px;
}
.site-logo {
  display:flex; align-items:center; gap:8px;
  font-weight:700; font-size:17px; color:var(--text); white-space:nowrap;
}
.logo-icon {
  width:30px; height:30px; background:var(--brand); border-radius:8px;
  display:flex; align-items:center; justify-content:center;
  color:#fff; font-size:13px; font-weight:700; flex-shrink:0;
}
.logo-sub {
  font-weight:400; color:var(--text-sub); font-size:13px;
  border-left:1px solid var(--border); padding-left:10px; margin-left:2px;
}
.header-nav { display:flex; align-items:center; gap:4px; }
.header-nav a {
  color:var(--text-sub); font-size:14px; padding:6px 12px;
  border-radius:var(--radius-sm); transition:background var(--tr),color var(--tr);
}
.header-nav a:hover  { background:var(--bg); color:var(--text); }
.header-nav a.active { color:var(--brand); background:var(--brand-light); }

/* 面包屑 */
.breadcrumb {
  padding:12px 0; font-size:13px; color:var(--text-muted);
  display:flex; align-items:center; gap:6px; flex-wrap:wrap;
}
.breadcrumb a { color:var(--text-sub); }
.breadcrumb a:hover { color:var(--brand); }
.breadcrumb .sep { color:var(--border); }
.breadcrumb .current { color:var(--text); }

/* 广告位 */
.ad-slot {
  background:#fff; border:1px solid var(--border);
  border-radius:var(--radius); overflow:hidden; text-align:center;
}
.ad-slot-top    { min-height:90px;  margin:16px 0 24px; display:flex; align-items:center; justify-content:center; }
.ad-slot-mid    { min-height:100px; margin:20px 0;       display:flex; align-items:center; justify-content:center; }
.ad-slot-bottom { min-height:250px; margin:24px 0;       display:flex; align-items:center; justify-content:center; }

/* 卡片 */
.card {
  background:#fff; border:1px solid var(--border);
  border-radius:var(--radius-lg); padding:28px; box-shadow:var(--shadow);
}
.card+.card { margin-top:20px; }
.card-title {
  font-size:15px; font-weight:700; color:var(--text);
  margin-bottom:18px; padding-bottom:14px; border-bottom:1px solid var(--border);
  display:flex; align-items:center; gap:8px;
}
.card-title .icon {
  width:27px; height:27px; background:var(--brand-light); border-radius:6px;
  display:flex; align-items:center; justify-content:center; color:var(--brand); font-size:14px;
}

/* 表单 */
.form-label { display:block; font-size:13px; font-weight:500; color:var(--text-sub); margin-bottom:7px; }
.form-select-wrap { position:relative; }
.form-select-wrap .arrow {
  position:absolute; right:11px; top:50%; transform:translateY(-50%);
  pointer-events:none; color:var(--text-muted); font-size:11px;
}
.form-select {
  width:100%; background:var(--bg); border:1px solid var(--border);
  border-radius:var(--radius-sm); color:var(--text);
  font-family:"Microsoft YaHei","微软雅黑",sans-serif;
  font-size:15px; padding:11px 34px 11px 13px;
  outline:none; appearance:none; -webkit-appearance:none; cursor:pointer;
  transition:border-color var(--tr), box-shadow var(--tr), background var(--tr);
}
.form-select:hover { border-color:#cbd5e1; }
.form-select:focus { border-color:var(--brand); background:#fff; box-shadow:0 0 0 3px rgba(37,99,235,0.1); }
.form-select option { background:#fff; }

/* 按钮 */
.btn-primary {
  display:block; width:100%; padding:14px; background:var(--brand); color:#fff;
  border:none; border-radius:var(--radius); cursor:pointer; font-size:16px;
  font-family:"Microsoft YaHei","微软雅黑",sans-serif; font-weight:500;
  letter-spacing:1px; box-shadow:0 2px 8px rgba(37,99,235,0.25);
  transition:all var(--tr); text-align:center;
}
.btn-primary:hover  { background:var(--brand-dark); box-shadow:0 4px 16px rgba(37,99,235,0.35); transform:translateY(-1px); }
.btn-primary:active { transform:translateY(0); }

/* 结果格 */
.result-grid {
  display:grid; grid-template-columns:repeat(auto-fit, minmax(120px,1fr));
  gap:12px; margin-bottom:14px;
}
.result-item {
  background:var(--bg); border:1px solid var(--border);
  border-radius:var(--radius); padding:14px 10px; text-align:center;
  transition:border-color var(--tr), box-shadow var(--tr);
}
.result-item:hover { border-color:var(--border-focus); box-shadow:var(--shadow); }
.result-item .val   { font-size:24px; font-weight:700; color:var(--brand); line-height:1.2; display:block; margin-bottom:3px; }
.result-item .val-sm { font-size:19px; }
.result-item .lbl   { font-size:12px; color:var(--text-muted); }
.result-item.highlight { background:var(--brand-light); border-color:var(--border-focus); }
.result-item.highlight .val { color:var(--brand-dark); }

/* 分割线 */
.divider { border:none; border-top:1px solid var(--border); margin:18px 0; }

/* 提示框 */
.tip-box {
  background:var(--brand-light); border-left:3px solid var(--brand);
  border-radius:0 var(--radius-sm) var(--radius-sm) 0;
  padding:12px 15px; font-size:14px; color:var(--text-sub); line-height:1.7; margin:14px 0;
}

/* SEO内容 */
.seo-section { margin-top:24px; }
.seo-section h2 { font-size:17px; font-weight:700; color:var(--text); margin-bottom:11px; padding-bottom:9px; border-bottom:2px solid var(--brand-light); }
.seo-section h3 { font-size:15px; font-weight:600; color:var(--text); margin:16px 0 6px; }
.seo-section p  { font-size:14px; color:var(--text-sub); line-height:1.8; margin-bottom:8px; }
.seo-section ul { padding-left:20px; font-size:14px; color:var(--text-sub); line-height:2; }

/* FAQ */
.faq-item { border:1px solid var(--border); border-radius:var(--radius-sm); margin-bottom:8px; overflow:hidden; }
.faq-q {
  width:100%; background:none; border:none; text-align:left; padding:13px 15px;
  font-family:"Microsoft YaHei","微软雅黑",sans-serif; font-size:14px; font-weight:500;
  color:var(--text); cursor:pointer; display:flex; justify-content:space-between;
  align-items:center; transition:background var(--tr);
}
.faq-q:hover { background:var(--bg); }
.faq-q .faq-icon { color:var(--text-muted); font-size:11px; transition:transform 0.2s; flex-shrink:0; margin-left:8px; }
.faq-item.open .faq-icon { transform:rotate(180deg); }
.faq-a { display:none; padding:11px 15px 13px; font-size:14px; color:var(--text-sub); line-height:1.8; border-top:1px solid var(--border); }
.faq-item.open .faq-a { display:block; }

/* 相关工具 */
.related-tools { display:grid; grid-template-columns:repeat(auto-fill, minmax(160px,1fr)); gap:11px; margin-top:11px; }
.tool-card {
  background:#fff; border:1px solid var(--border); border-radius:var(--radius);
  padding:13px; display:flex; align-items:center; gap:10px;
  transition:all var(--tr); color:var(--text);
}
.tool-card:hover { border-color:var(--brand); box-shadow:var(--shadow); transform:translateY(-2px); }
.tc-icon { width:33px; height:33px; border-radius:7px; display:flex; align-items:center; justify-content:center; font-size:16px; flex-shrink:0; }
.tc-name { font-size:13px; font-weight:600; color:var(--text); display:block; }
.tc-desc { font-size:11px; color:var(--text-muted); display:block; margin-top:2px; }

/* 页面标题 */
.page-body  { padding:18px 0 60px; }
.page-title { font-size:clamp(20px,4vw,27px); font-weight:700; color:var(--text); margin-bottom:4px; }
.page-desc  { font-size:14px; color:var(--text-muted); margin-bottom:20px; }

/* 目录首页 Hero */
.tools-hero {
  background:linear-gradient(135deg,#2563eb 0%,#1d4ed8 100%);
  color:#fff; padding:50px 20px; text-align:center; margin-bottom:32px;
}
.tools-hero h1 { font-size:clamp(22px,5vw,36px); font-weight:700; margin-bottom:10px; }
.tools-hero p  { font-size:15px; opacity:.85; max-width:460px; margin:0 auto; }
.tools-search-wrap { margin:20px auto 0; max-width:400px; position:relative; }
.tools-search {
  width:100%; border:none; border-radius:50px; padding:12px 46px 12px 18px;
  font-size:15px; font-family:"Microsoft YaHei","微软雅黑",sans-serif;
  color:var(--text); box-shadow:0 4px 20px rgba(0,0,0,0.15); outline:none;
}
.tools-search-btn {
  position:absolute; right:5px; top:50%; transform:translateY(-50%);
  background:var(--brand); border:none; border-radius:50px;
  width:35px; height:35px; cursor:pointer; color:#fff; font-size:14px;
  display:flex; align-items:center; justify-content:center;
}

.category-section { margin-bottom:32px; }
.category-title {
  font-size:15px; font-weight:700; color:var(--text);
  margin-bottom:13px; display:flex; align-items:center; gap:7px;
}
.cat-icon  { font-size:16px; }
.cat-count { font-size:12px; color:var(--text-muted); font-weight:400; }

.tools-grid { display:grid; grid-template-columns:repeat(auto-fill, minmax(185px,1fr)); gap:13px; }
.tool-item {
  background:#fff; border:1px solid var(--border); border-radius:var(--radius);
  padding:17px 14px; display:flex; flex-direction:column; gap:5px;
  transition:all var(--tr); color:var(--text); position:relative; overflow:hidden;
}
.tool-item:hover { border-color:var(--brand); box-shadow:var(--shadow-md); transform:translateY(-3px); }
.tool-item::before {
  content:''; position:absolute; top:0; left:0; right:0; height:3px;
  background:var(--brand); opacity:0; transition:opacity var(--tr);
}
.tool-item:hover::before { opacity:1; }
.ti-icon  { font-size:25px; }
.ti-name  { font-size:14px; font-weight:600; color:var(--text); }
.ti-desc  { font-size:12px; color:var(--text-muted); line-height:1.5; }
.ti-badge { display:inline-block; background:#fef3c7; color:#92400e; font-size:10px; padding:2px 7px; border-radius:10px; font-weight:500; align-self:flex-start; }
.ti-badge.new { background:#dcfce7; color:#166534; }

/* Footer */
.site-footer { background:#fff; border-top:1px solid var(--border); padding:24px 20px; margin-top:56px; text-align:center; }
.footer-links { display:flex; justify-content:center; gap:22px; flex-wrap:wrap; margin-bottom:10px; }
.footer-links a { font-size:13px; color:var(--text-muted); }
.footer-links a:hover { color:var(--brand); }
.footer-copy { font-size:12px; color:var(--text-muted); }

/* 动画 */
@keyframes fadeUp { from{opacity:0;transform:translateY(12px)} to{opacity:1;transform:translateY(0)} }
.fade-up { animation:fadeUp .35s ease both; }

/* 响应式 */
@media(max-width:640px){
  .card{padding:16px 13px;}
  .result-grid{grid-template-columns:repeat(3,1fr);}
  .tools-grid{grid-template-columns:repeat(2,1fr);}
  .related-tools{grid-template-columns:repeat(2,1fr);}
  .header-nav{display:none;}
  .tools-hero{padding:32px 16px;}
}
@media(max-width:380px){
  .result-grid{grid-template-columns:repeat(2,1fr);}
}