/* ============================================================
   钢铁侠工具箱 · 极简工具站风格 v0.5
   参考 sutools.cn：纯色设计、紧凑网格、sticky分类、信息密度高
   保留品牌蓝强调色，去掉渐变/玻璃拟态/点阵纹理
   ============================================================ */

:root{
  /* 背景与卡片 */
  --bg:#f8fafc;
  --bg-soft:#f1f5f9;
  --card:#ffffff;
  --card-hover:#f8fafc;

  /* 边框 */
  --line:#e2e8f0;
  --line2:#cbd5e1;
  --line-focus:#2563eb;

  /* 文字 */
  --txt:#0f172a;
  --txt2:#475569;
  --txt3:#94a3b8;
  --txt4:#cbd5e1;

  /* 主色（深灰蓝，按钮/激活态） */
  --primary:#1e293b;
  --primary-hover:#0f172a;
  --primary-light:#f1f5f9;

  /* 品牌蓝（强调色） */
  --brand:#2563eb;
  --brand-hover:#1d4ed8;
  --brand-light:#eff6ff;
  --brand-glow:rgba(37,99,235,.12);

  /* 功能色 */
  --ok:#16a34a;
  --ok-bg:#f0fdf4;
  --warn:#d97706;
  --warn-bg:#fffbeb;
  --danger:#dc2626;
  --danger-bg:#fef2f2;

  /* 圆角（统一8px） */
  --r:8px;
  --r2:10px;
  --r3:12px;

  /* 阴影 */
  --shadow-xs:0 1px 2px rgba(15,23,42,.04);
  --shadow-sm:0 1px 3px rgba(15,23,42,.06);
  --shadow:0 2px 8px rgba(15,23,42,.07);
  --shadow-md:0 6px 20px rgba(15,23,42,.09);
  --shadow-lg:0 12px 32px rgba(15,23,42,.11);

  --max-w:1200px;
}

*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:var(--bg);
  color:var(--txt);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei","PingFang SC","Helvetica Neue",sans-serif;
  font-size:14.5px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  min-height:100vh;
}
main{position:relative}
a{color:var(--brand);text-decoration:none}
a:hover{color:var(--brand-hover)}
img{max-width:100%}
button{font-family:inherit;cursor:pointer}
input,select,textarea{font-family:inherit}

::selection{background:var(--brand-light);color:var(--primary)}
::-webkit-scrollbar{width:8px;height:8px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:var(--line2);border-radius:4px}
::-webkit-scrollbar-thumb:hover{background:var(--txt3)}

.container{max-width:var(--max-w);margin:0 auto;padding:0 20px}

/* ============================================================
   Header — sticky 毛玻璃，logo + 搜索 + 导航
   ============================================================ */
.site-header{
  background:rgba(255,255,255,.88);
  backdrop-filter:saturate(180%) blur(12px);
  -webkit-backdrop-filter:saturate(180%) blur(12px);
  border-bottom:1px solid var(--line);
  position:sticky;
  top:0;
  z-index:100;
}
.site-header .container{
  display:flex;
  align-items:center;
  height:60px;
  gap:20px;
}
.site-logo{
  display:flex;
  align-items:center;
  gap:8px;
  cursor:pointer;
  text-decoration:none;
  transition:opacity .2s;
  flex-shrink:0;
}
.site-logo:hover{opacity:.85}
.site-logo .logo-badge{
  width:30px;height:30px;
  background:linear-gradient(135deg,var(--brand),#6366f1);
  border-radius:var(--r);
  display:flex;align-items:center;justify-content:center;
  color:#fff;font-weight:800;font-size:14px;
  box-shadow:0 2px 6px rgba(37,99,235,.3);
}
.site-logo span{
  font-size:18px;
  font-weight:800;
  color:var(--txt);
  letter-spacing:-.3px;
}
.header-search{
  flex:1;
  max-width:400px;
  position:relative;
}
.header-search input{
  width:100%;
  height:38px;
  padding:0 14px 0 38px;
  border:1px solid var(--line);
  border-radius:var(--r);
  font-size:14px;
  color:var(--txt);
  background:var(--bg-soft);
  outline:none;
  transition:all .2s;
}
.header-search input::placeholder{color:var(--txt3)}
.header-search input:focus{
  border-color:var(--brand);
  background:var(--card);
  box-shadow:0 0 0 3px var(--brand-glow);
}
.header-search::before{
  content:"";
  position:absolute;
  left:12px;top:50%;
  transform:translateY(-50%);
  width:16px;height:16px;
  background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round'%3E%3Ccircle cx='11' cy='11' r='8'/%3E%3Cpath d='m21 21-4.3-4.3'/%3E%3C/svg%3E") no-repeat center;
  pointer-events:none;
}
.header-nav{
  display:flex;
  gap:2px;
  margin-left:auto;
}
.header-nav a{
  padding:7px 14px;
  font-size:14px;
  font-weight:500;
  color:var(--txt2);
  text-decoration:none;
  border-radius:var(--r);
  transition:all .2s;
  white-space:nowrap;
}
.header-nav a:hover{
  background:var(--primary-light);
  color:var(--brand);
}
.header-nav a.active{
  color:var(--brand);
  background:var(--brand-light);
}
.header-cta{
  padding:7px 16px;
  font-size:13.5px;
  font-weight:600;
  color:var(--txt2);
  border:1px solid var(--line);
  border-radius:var(--r);
  background:var(--card);
  cursor:pointer;
  transition:all .2s;
  white-space:nowrap;
}
.header-cta:hover{
  border-color:var(--brand);
  color:var(--brand);
}

/* ============================================================
   Hero — 居中简洁，大标题 + 副标题 + 统计
   ============================================================ */
.hero{
  background:var(--card);
  border-bottom:1px solid var(--line);
  padding:48px 0 40px;
  text-align:center;
}
.hero-title{
  font-size:30px;
  font-weight:800;
  color:var(--txt);
  margin:0 0 12px;
  letter-spacing:-.5px;
  line-height:1.3;
}
.hero-title .accent{
  background:linear-gradient(135deg,var(--brand),#6366f1);
  -webkit-background-clip:text;
  -webkit-text-fill-color:transparent;
  background-clip:text;
}
.hero-sub{
  font-size:15px;
  line-height:1.7;
  color:var(--txt2);
  max-width:620px;
  margin:0 auto 16px;
}
.hero-meta{
  font-size:13px;
  color:var(--txt3);
  display:flex;
  justify-content:center;
  align-items:center;
  gap:6px;
  flex-wrap:wrap;
}
.hero-meta .num{
  font-weight:700;
  color:var(--brand);
  font-variant-numeric:tabular-nums;
}

/* ============================================================
   Section
   ============================================================ */
.section{padding:28px 0}
.section-title{
  font-size:18px;
  font-weight:700;
  color:var(--txt);
  margin:0 0 16px;
  letter-spacing:-.2px;
}

/* ============================================================
   分类标签 — sticky，白色容器
   ============================================================ */
.cat-tabs{
  display:flex;
  flex-wrap:wrap;
  gap:6px;
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--r);
  padding:6px;
  margin-bottom:16px;
  position:sticky;
  top:60px;
  z-index:50;
  box-shadow:var(--shadow-xs);
}
.cat-tab{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:7px 14px;
  font-size:13.5px;
  font-weight:500;
  color:var(--txt2);
  background:transparent;
  border:1px solid transparent;
  border-radius:var(--r);
  cursor:pointer;
  transition:all .2s cubic-bezier(.4,0,.2,1);
  white-space:nowrap;
}
.cat-tab:hover{
  background:var(--primary-light);
  color:var(--txt);
}
.cat-tab.active{
  background:var(--primary);
  color:#fff;
  box-shadow:0 2px 6px rgba(15,23,42,.15);
}
.cat-tab .ct-count{
  font-size:11px;
  padding:1px 6px;
  border-radius:9px;
  background:rgba(0,0,0,.06);
  font-weight:500;
}
.cat-tab.active .ct-count{background:rgba(255,255,255,.22)}

/* ============================================================
   工具网格 — 紧凑横向卡片
   ============================================================ */
.tools-grid{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(220px,1fr));
  gap:10px;
}
.tool-card{
  display:flex;
  align-items:center;
  gap:12px;
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--r);
  padding:14px 16px;
  text-decoration:none;
  color:var(--txt);
  transition:all .22s cubic-bezier(.4,0,.2,1);
  position:relative;
  overflow:hidden;
}
.tool-card::after{
  content:"";
  position:absolute;
  left:0;top:0;bottom:0;
  width:3px;
  background:var(--brand);
  transform:scaleY(0);
  transform-origin:center;
  transition:transform .25s cubic-bezier(.4,0,.2,1);
}
.tool-card:hover{
  border-color:var(--line2);
  transform:translateY(-2px);
  box-shadow:var(--shadow);
}
.tool-card:hover::after{transform:scaleY(1)}
.tool-card .tc-icon{
  width:36px;height:36px;
  flex-shrink:0;
  border-radius:var(--r);
  background:var(--primary-light);
  color:var(--txt2);
  display:flex;align-items:center;justify-content:center;
  transition:all .22s;
}
.tool-card:hover .tc-icon{
  background:var(--primary);
  color:#fff;
}
.tool-card .tc-icon svg{width:18px;height:18px}
.tool-card .tc-body{flex:1;min-width:0}
.tool-card .tc-name{
  font-size:14px;
  font-weight:600;
  margin-bottom:2px;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
  letter-spacing:-.1px;
}
.tool-card .tc-desc{
  font-size:12px;
  color:var(--txt3);
  line-height:1.4;
  display:-webkit-box;
  -webkit-line-clamp:1;
  -webkit-box-orient:vertical;
  overflow:hidden;
}

/* ============================================================
   频道页（/c/xxx）
   ============================================================ */
.channel-header{
  background:var(--card);
  border-bottom:1px solid var(--line);
  padding:36px 0 28px;
}
.channel-header h2{
  font-size:26px;
  font-weight:800;
  margin:0 0 8px;
  letter-spacing:-.4px;
}
.channel-header p{
  font-size:14.5px;
  color:var(--txt2);
  margin:0;
}
.group-title{
  font-size:15px;
  font-weight:700;
  color:var(--txt);
  margin:24px 0 12px;
  padding-left:10px;
  border-left:3px solid var(--brand);
}

/* ============================================================
   面包屑
   ============================================================ */
.crumb{
  font-size:13px;
  color:var(--txt3);
  padding:16px 0 0;
}
.crumb a{color:var(--txt3)}
.crumb a:hover{color:var(--brand)}

/* ============================================================
   工具页
   ============================================================ */
.tool-page{padding:20px 0 40px}
.tool-page-header{margin-bottom:16px}
.tool-page-header h2{
  font-size:24px;
  font-weight:700;
  color:var(--txt);
  margin:8px 0 6px;
  letter-spacing:-.3px;
}
.tool-page-header p{
  font-size:14px;
  color:var(--txt2);
  margin:0;
}

/* 步骤条 */
.steps{
  display:flex;
  align-items:center;
  gap:0;
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--r);
  padding:14px 20px;
  margin-bottom:16px;
}
.step{
  display:flex;
  align-items:center;
  gap:8px;
  font-size:13.5px;
  color:var(--txt3);
  font-weight:500;
}
.step.active{color:var(--brand);font-weight:600}
.step.done{color:var(--ok)}
.step .num{
  width:24px;height:24px;
  border-radius:50%;
  background:var(--bg-soft);
  color:var(--txt3);
  display:flex;align-items:center;justify-content:center;
  font-size:12px;font-weight:700;
  flex-shrink:0;
}
.step.active .num{background:var(--brand);color:#fff}
.step.done .num{background:var(--ok);color:#fff}
.step-line{
  flex:1;
  height:2px;
  background:var(--line);
  margin:0 12px;
  min-width:20px;
}

/* 工具主体：左表单右结果 */
.tool{
  display:grid;
  grid-template-columns:1fr 1.2fr;
  gap:16px;
  margin-bottom:16px;
}
.form{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--r);
  padding:20px;
}
.form-title{
  font-size:15px;
  font-weight:700;
  margin:0 0 16px;
  padding-bottom:10px;
  border-bottom:1px solid var(--line);
  display:flex;align-items:center;gap:8px;
}
.field{margin-bottom:14px}
.field:last-child{margin-bottom:0}
.field label{
  display:block;
  font-size:13px;
  font-weight:600;
  color:var(--txt2);
  margin-bottom:6px;
}
.field .hint{
  font-size:12px;
  color:var(--txt3);
  margin-top:4px;
  font-weight:400;
}
.field input[type="text"],
.field input[type="number"],
.field select,
.field textarea{
  width:100%;
  padding:9px 12px;
  border:1px solid var(--line);
  border-radius:var(--r);
  font-size:14px;
  color:var(--txt);
  background:var(--card);
  outline:none;
  transition:border-color .2s,box-shadow .2s;
}
.field input:focus,.field select:focus,.field textarea:focus{
  border-color:var(--brand);
  box-shadow:0 0 0 3px var(--brand-glow);
}
.field textarea{resize:vertical;min-height:80px;font-family:inherit}

/* 文件上传 */
.upload-area{
  border:2px dashed var(--line);
  border-radius:var(--r);
  padding:24px;
  text-align:center;
  cursor:pointer;
  transition:all .2s;
  background:var(--bg-soft);
}
.upload-area:hover{
  border-color:var(--brand);
  background:var(--brand-light);
}
.upload-area.dragover{
  border-color:var(--brand);
  background:var(--brand-light);
}
.upload-area .up-icon{
  width:40px;height:40px;
  margin:0 auto 8px;
  color:var(--txt3);
}
.upload-area .up-text{
  font-size:13.5px;
  color:var(--txt2);
  font-weight:500;
}
.upload-area .up-hint{
  font-size:12px;
  color:var(--txt3);
  margin-top:4px;
}
.file-list{
  margin-top:10px;
  display:flex;
  flex-direction:column;
  gap:6px;
}
.file-item{
  display:flex;
  align-items:center;
  gap:8px;
  padding:8px 10px;
  background:var(--bg-soft);
  border-radius:var(--r);
  font-size:13px;
}
.file-item .fi-name{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.file-item .fi-size{color:var(--txt3);font-size:12px;flex-shrink:0}
.file-item .fi-remove{
  color:var(--txt3);
  cursor:pointer;
  padding:2px 6px;
  border-radius:4px;
  flex-shrink:0;
}
.file-item .fi-remove:hover{color:var(--danger);background:var(--danger-bg)}

/* 按钮 */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:6px;
  padding:10px 20px;
  font-size:14px;
  font-weight:600;
  border-radius:var(--r);
  border:1px solid transparent;
  cursor:pointer;
  transition:all .2s;
  text-decoration:none;
}
.btn-primary{
  background:var(--brand);
  color:#fff;
}
.btn-primary:hover{
  background:var(--brand-hover);
  color:#fff;
  transform:translateY(-1px);
  box-shadow:0 4px 12px rgba(37,99,235,.3);
}
.btn-primary:disabled{
  background:var(--txt4);
  cursor:not-allowed;
  transform:none;
  box-shadow:none;
}
.btn-ghost{
  background:var(--card);
  color:var(--txt2);
  border-color:var(--line);
}
.btn-ghost:hover{
  border-color:var(--brand);
  color:var(--brand);
}
.btn-block{width:100%}
.btn-group{display:flex;gap:8px;margin-top:16px}
.btn-group .btn{flex:1}

/* 结果区 */
.result{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--r);
  padding:20px;
  min-height:300px;
  display:flex;
  flex-direction:column;
}
.result-title{
  font-size:15px;
  font-weight:700;
  margin:0 0 16px;
  padding-bottom:10px;
  border-bottom:1px solid var(--line);
  display:flex;align-items:center;gap:8px;
}
.result-body{flex:1}
.empty{
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  height:100%;
  min-height:200px;
  color:var(--txt3);
  font-size:13.5px;
  text-align:center;
}
.empty .empty-icon{
  width:48px;height:48px;
  margin-bottom:12px;
  color:var(--txt4);
}
.result-item{
  padding:10px 0;
  border-bottom:1px solid var(--line);
}
.result-item:last-child{border-bottom:none}
.result-item .ri-label{
  font-size:12px;
  color:var(--txt3);
  margin-bottom:2px;
}
.result-item .ri-value{
  font-size:15px;
  font-weight:600;
  color:var(--txt);
  font-family:monospace;
}
.download-btn{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:8px 16px;
  background:var(--ok);
  color:#fff;
  border-radius:var(--r);
  font-size:13.5px;
  font-weight:600;
  text-decoration:none;
  margin-top:8px;
  transition:all .2s;
}
.download-btn:hover{background:#15803d;color:#fff}

/* 说明区 */
.sec{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--r);
  padding:18px 20px;
  margin-bottom:16px;
}
.sec h3{
  font-size:15px;
  font-weight:700;
  margin:0 0 10px;
  display:flex;align-items:center;gap:8px;
}
.sec p{
  font-size:13.5px;
  color:var(--txt2);
  line-height:1.7;
  margin:0;
}

/* 免责声明 */
.disc{
  display:flex;
  gap:10px;
  padding:14px 18px;
  background:var(--warn-bg);
  border:1px solid #fde68a;
  border-radius:var(--r);
  font-size:13px;
  color:#92400e;
  line-height:1.6;
}
.disc svg{flex-shrink:0;margin-top:2px}

/* ============================================================
   页脚
   ============================================================ */
.site-footer{
  background:var(--card);
  border-top:1px solid var(--line);
  padding:32px 0 24px;
  margin-top:40px;
}
.footer-grid{
  display:grid;
  grid-template-columns:2fr 1fr 1fr 1fr;
  gap:32px;
  margin-bottom:24px;
}
.footer-brand .footer-logo{
  font-size:16px;
  font-weight:800;
  color:var(--txt);
  margin-bottom:8px;
}
.footer-brand p{
  font-size:13px;
  color:var(--txt3);
  line-height:1.7;
  margin:0;
}
.footer-col h4{
  font-size:13px;
  font-weight:700;
  color:var(--txt);
  margin:0 0 12px;
}
.footer-col a{
  display:block;
  font-size:13px;
  color:var(--txt3);
  padding:4px 0;
  text-decoration:none;
  transition:color .2s;
}
.footer-col a:hover{color:var(--brand)}
.footer-bottom{
  padding-top:20px;
  border-top:1px solid var(--line);
  display:flex;
  justify-content:space-between;
  align-items:center;
  flex-wrap:wrap;
  gap:12px;
  font-size:12.5px;
  color:var(--txt3);
}
.footer-bottom a{color:var(--txt3)}
.footer-bottom a:hover{color:var(--brand)}

/* ============================================================
   响应式
   ============================================================ */
@media(max-width:900px){
  .tool{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr;gap:24px}
}
@media(max-width:640px){
  .site-header .container{height:56px;gap:12px;padding:0 14px}
  .site-logo span{display:none}
  .header-nav{display:none}
  .header-search{max-width:none}
  .container{padding:0 14px}
  .hero{padding:32px 0 28px}
  .hero-title{font-size:22px}
  .hero-sub{font-size:14px}
  .tools-grid{grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:8px}
  .tool-card{padding:12px}
  .tool-card .tc-icon{width:32px;height:32px}
  .cat-tabs{top:56px;padding:5px}
  .cat-tab{padding:6px 10px;font-size:12.5px}
  .footer-grid{grid-template-columns:1fr}
  .steps{padding:10px 14px;flex-wrap:wrap}
  .step-line{display:none}
}

/* 兼容旧 class */
.r-item{padding:8px 0;border-bottom:1px solid var(--line)}
.r-item:last-child{border-bottom:none}
.r-item .k{font-size:12px;color:var(--txt3);margin-bottom:2px}
.r-item .v{font-size:15px;font-weight:600;color:var(--txt);font-family:monospace}
.r-main{padding:16px 0;border-bottom:1px solid var(--line);margin-bottom:8px}
.r-main .k{font-size:13px;color:var(--txt3);margin-bottom:4px}
.r-main .v{font-size:22px;font-weight:700;color:var(--ok)}
.r-main .v small{font-size:13px;font-weight:400;color:var(--txt3)}
.r-list{margin-bottom:8px}

/* 产品矩阵卡片 */
.products-grid{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(280px,1fr));
  gap:12px;
}
.product-card{
  display:flex;
  align-items:flex-start;
  gap:12px;
  background:var(--bg);
  border:1px solid var(--line);
  border-radius:var(--r);
  padding:16px;
  transition:all .22s cubic-bezier(.4,0,.2,1);
}
.product-card:hover{
  border-color:var(--brand);
  background:var(--card);
  transform:translateY(-2px);
  box-shadow:var(--shadow);
}
.product-card .pc-icon{
  width:40px;height:40px;
  flex-shrink:0;
  border-radius:var(--r);
  background:var(--brand-light);
  color:var(--brand);
  display:flex;align-items:center;justify-content:center;
}
.product-card .pc-icon svg{width:20px;height:20px}
.product-card .pc-body{flex:1;min-width:0}
.product-card .pc-name{
  font-size:14.5px;
  font-weight:700;
  color:var(--txt);
  margin-bottom:4px;
  display:flex;
  align-items:center;
  gap:8px;
}
.pc-status{
  font-size:11px;
  font-weight:500;
  padding:2px 8px;
  border-radius:9px;
  background:var(--ok-bg);
  color:var(--ok);
  flex-shrink:0;
}
.product-card .pc-desc{
  font-size:12.5px;
  color:var(--txt3);
  line-height:1.5;
}

/* 免费/付费标签 */
.tag-free, .tag-paid, .tag-member{
  display:inline-block;
  font-size:10px;
  font-weight:600;
  padding:1px 6px;
  border-radius:4px;
  margin-left:6px;
  vertical-align:middle;
  line-height:1.4;
}
.tag-free{ background:#e8f5e9; color:#2e7d32; }
.tag-paid{ background:#fff3e0; color:#e65100; }
.tag-member{ background:#e3f2fd; color:#1565c0; }

/* 付费拦截弹窗 */
.paywall{
  text-align:center;
  padding:40px 20px;
}
.pw-icon{
  width:56px;height:56px;
  margin:0 auto 16px;
  border-radius:50%;
  background:linear-gradient(135deg,#ff9800,#f57c00);
  color:#fff;
  display:flex;align-items:center;justify-content:center;
}
.pw-icon svg{width:28px;height:28px}
.pw-title{
  font-size:18px;
  font-weight:700;
  color:var(--txt);
  margin-bottom:8px;
}
.pw-price{
  font-size:32px;
  font-weight:800;
  color:#e65100;
  margin-bottom:8px;
}
.pw-desc{
  font-size:13px;
  color:var(--txt3);
  margin-bottom:20px;
}
.pw-actions{
  display:flex;
  gap:10px;
  justify-content:center;
  margin-bottom:16px;
  flex-wrap:wrap;
}
.pw-actions .btn{
  min-width:140px;
}
.pw-note{
  font-size:12px;
  color:var(--txt4);
  line-height:1.6;
}
.note{font-size:12.5px;color:var(--txt3);margin-top:10px;padding:8px 12px;background:var(--bg-soft);border-radius:var(--r)}
.acts{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.file-prev{display:flex;align-items:center;gap:12px;padding:10px 0;border-bottom:1px solid var(--line)}
.file-prev img{width:48px;height:48px;object-fit:cover;border-radius:var(--r)}
.file-prev .info{flex:1}
.file-prev .name{font-size:13.5px;font-weight:500;color:var(--txt)}
.file-prev .info div:last-child{font-size:12px;color:var(--txt3)}
.tb{width:100%;border-collapse:collapse;font-size:13.5px}
.tb th,.tb td{padding:10px 12px;text-align:left;border-bottom:1px solid var(--line)}
.tb th{background:var(--bg-soft);font-weight:600;color:var(--txt2)}
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%) translateY(20px);background:var(--primary);color:#fff;padding:10px 20px;border-radius:var(--r);font-size:13.5px;opacity:0;transition:all .3s;z-index:999;pointer-events:none}
.toast.on{opacity:1;transform:translateX(-50%) translateY(0)}

/* 拖拽上传提示 */
.drop-hint{
  position:absolute;inset:0;
  background:rgba(37,99,235,.08);
  border:3px dashed var(--brand);
  display:flex;align-items:center;justify-content:center;
  font-size:20px;font-weight:700;color:var(--brand);
  z-index:10;pointer-events:none;
  opacity:0;transition:opacity .2s;
  border-radius:var(--r);
}
.tool.dragging{position:relative}
.tool.dragging .drop-hint{opacity:1}

/* 文件输入框样式 */
.field input[type="file"]{
  width:100%;
  padding:8px;
  border:1px solid var(--line);
  border-radius:var(--r);
  background:var(--bg-soft);
  font-size:13px;
  cursor:pointer;
}
.field input[type="file"]:hover{border-color:var(--brand)}

/* ============================================================
   首页改版新增样式：分类导航卡片 + Hero按钮 + 桌面版Banner
   ============================================================ */

/* Hero按钮区 */
.hero-actions{
  display:flex;gap:12px;margin-top:20px;flex-wrap:wrap;
}
.btn-primary{
  display:inline-flex;align-items:center;gap:6px;
  padding:10px 24px;background:var(--brand);color:#fff;
  border-radius:var(--r);font-size:14px;font-weight:600;
  text-decoration:none;transition:all .15s;
}
.btn-primary:hover{background:var(--brand-hover);color:#fff;transform:translateY(-1px)}
.btn-secondary{
  display:inline-flex;align-items:center;gap:6px;
  padding:10px 24px;background:var(--card);color:var(--txt);
  border:1px solid var(--line);border-radius:var(--r);
  font-size:14px;font-weight:600;text-decoration:none;transition:all .15s;
}
.btn-secondary:hover{border-color:var(--brand);color:var(--brand)}
.btn-lg{padding:14px 32px;font-size:16px}

/* 分类导航卡片 */
.cat-cards{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));
  gap:14px;margin-top:8px;
}
.cat-card{
  display:flex;align-items:center;gap:14px;
  padding:18px;background:var(--card);
  border:1px solid var(--line);border-radius:var(--r2);
  text-decoration:none;color:var(--txt);transition:all .15s;
}
.cat-card:hover{
  border-color:var(--brand);box-shadow:var(--shadow);
  transform:translateY(-2px);
}
.cc-icon{
  width:48px;height:48px;flex-shrink:0;
  display:flex;align-items:center;justify-content:center;
  background:var(--brand-light);color:var(--brand);
  border-radius:var(--r);
}
.cc-body{flex:1;min-width:0}
.cc-name{
  font-size:15px;font-weight:600;margin-bottom:2px;
  display:flex;align-items:center;gap:8px;
}
.cc-count{
  font-size:11px;font-weight:400;color:var(--txt3);
  background:var(--bg-soft);padding:2px 8px;border-radius:10px;
}
.cc-sub{font-size:12.5px;color:var(--txt2);margin-bottom:4px}
.cc-hot{font-size:11.5px;color:var(--txt3);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.cc-arrow{color:var(--txt3);flex-shrink:0;transition:transform .15s}
.cat-card:hover .cc-arrow{color:var(--brand);transform:translateX(3px)}

/* 桌面版Banner */
.desktop-banner{
  display:flex;align-items:center;justify-content:space-between;
  gap:24px;padding:32px;
  background:linear-gradient(135deg,var(--brand-light),#fff);
  border:1px solid var(--line);border-radius:var(--r3);
  flex-wrap:wrap;
}
.db-left{flex:1;min-width:280px}
.db-left h3{font-size:20px;margin-bottom:8px;color:var(--txt)}
.db-left p{font-size:14px;color:var(--txt2);margin-bottom:12px;line-height:1.6}
.db-features{display:flex;flex-wrap:wrap;gap:8px}
.db-features span{
  font-size:12.5px;color:var(--brand);
  background:#fff;padding:4px 10px;border-radius:12px;
  border:1px solid var(--brand-light);
}
.db-right{text-align:center;flex-shrink:0}

/* 响应式 */
@media(max-width:640px){
  .cat-cards{grid-template-columns:1fr}
  .desktop-banner{padding:20px}
  .hero-actions{flex-direction:column}
  .hero-actions .btn-primary,.hero-actions .btn-secondary{justify-content:center}
}