/* =========================================================
   Sevenbase 龙虾社区 · 设计系统 v1.1（chrome 层）
   米白内容底色 + 炭黑结构 + 珊瑚橙红强调
   扁平化 · 无渐变 · 几何图形语言
   ---------------------------------------------------------
   职责边界（A 批次清理后）：
   - 本文件只服务「chrome + admin」：head/nav/footer/404/后台 EJS
   - 前台页面 body 由 SSR 输出 .sb-* 组件（样式在 sb-runtime.css，
     token 的单一真相源；本文件 --c-* 仅保留等值别名）
   - 旧页面模板已删（4.4d/A 批次），历史区块样式已移除
   ========================================================= */

:root {
  /* 品牌色彩（与 sb-runtime.css 的 --sb-* 同值：coral/ink/cream/gray/line） */
  --c-coral: #E8401C;        /* 珊瑚橙红 主色/强调 */
  --c-coral-dark: #C5330F;
  --c-ink: #1A1A1A;          /* 炭黑 结构/文字 */
  --c-cream: #F5F0EB;        /* 米白暖灰 背景 */
  --c-white: #FFFFFF;        /* 辅助白 */
  --c-gray: #8A8A8A;         /* 辅助灰 */
  --c-line: rgba(26,26,26,0.10);
  --c-line-strong: rgba(26,26,26,0.18);

  /* 字体：中文走系统黑体栈；西文标题 Archivo（几何）；数字/等宽 IBM Plex Mono */
  --font-cn: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Source Han Sans SC", "Noto Sans SC", sans-serif;
  --font-en: "Archivo", "Inter", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --font-num: "IBM Plex Mono", "Futura", var(--font-en);

  /* 圆角：与 sb-runtime 两档对齐（--sb-radius-1/-2） */
  --r-sm: 12px;
  --r-md: 12px;
  --r-lg: 20px;
  --r-pill: 999px;

  /* 间距 */
  --maxw: 1180px;
  --gutter: clamp(18px, 4vw, 40px);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-cn);
  background: var(--c-cream);
  color: var(--c-ink);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* ---------- 排版 ---------- */
h1,h2,h3,h4 { font-weight: 800; line-height: 1.2; letter-spacing: -0.01em; }
.h2 { font-size: clamp(26px, 3.4vw, 38px); }
.h3 { font-size: clamp(20px, 2.4vw, 26px); }
.lead { font-size: clamp(16px, 1.6vw, 19px); color: #444; }
.muted { color: var(--c-gray); }
.text-orange { color: var(--c-coral); }
.num { font-family: var(--font-num); font-weight: 700; }

/* ---------- 布局 ---------- */
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gutter); }
.section { padding: clamp(48px, 8vw, 96px) 0; }
.grid { display: grid; gap: clamp(16px, 2.4vw, 28px); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.row { display: flex; align-items: center; gap: 12px; }
.center { text-align: center; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-family: var(--font-cn); font-weight: 700; font-size: 15px;
  padding: 13px 26px; border-radius: var(--r-pill); cursor: pointer;
  border: 2px solid transparent; transition: transform .12s ease, background .15s ease, color .15s ease;
  line-height: 1; white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--c-coral); color: #fff; }
.btn-primary:hover { background: var(--c-coral-dark); }
.btn-ghost { background: transparent; color: var(--c-ink); border-color: var(--c-line-strong); }
.btn-ghost:hover { border-color: var(--c-ink); }
.btn-sm { padding: 9px 18px; font-size: 14px; }

/* ---------- 徽章 ---------- */
.demo-badge {
  display: inline-flex; align-items: center; gap: 4px; font-size: 11px; font-weight: 700;
  padding: 3px 9px; border-radius: var(--r-pill); background: #FFF3EC; color: var(--c-coral-dark);
  border: 1px solid rgba(232,64,28,0.3); letter-spacing: .02em;
}

/* ---------- 导航栏 ---------- */
.nav {
  position: sticky; top: 0; z-index: 100; background: rgba(245,240,235,0.92);
  backdrop-filter: blur(8px); border-bottom: 1px solid var(--c-line);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.nav-logo { display: flex; align-items: center; gap: 4px; }
.nav-logo img { height: 30px; width: auto; }
.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-links a {
  font-weight: 600; font-size: 15px; padding: 8px 14px; border-radius: var(--r-pill);
  color: var(--c-ink); transition: background .15s ease;
}
.nav-links a:hover { background: rgba(26,26,26,0.06); }
.nav-links a.active { color: var(--c-coral); }
.nav-cta { display: flex; align-items: center; gap: 10px; }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--c-ink); margin: 5px 0; transition: .2s; }

/* 移动端菜单 */
.mobile-menu { display: none; flex-direction: column; padding: 8px var(--gutter) 20px; border-bottom: 1px solid var(--c-line); background: var(--c-cream); }
.mobile-menu.open { display: flex; }
.mobile-menu a { padding: 13px 4px; font-weight: 600; border-bottom: 1px solid var(--c-line); }
.mobile-menu a:last-child { border-bottom: none; }

/* ---------- 页脚 ---------- */
.footer { background: var(--c-ink); color: rgba(255,255,255,0.82); padding: clamp(48px,7vw,80px) 0 32px; }
.footer a { color: rgba(255,255,255,0.82); }
.footer a:hover { color: #fff; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 32px; }
.footer .logo-white { height: 30px; margin-bottom: 16px; }
.footer h4 { color: #fff; font-size: 15px; margin-bottom: 14px; }
.footer ul li { margin-bottom: 9px; font-size: 14px; }
.footer-bottom { margin-top: 40px; padding-top: 22px; border-top: 1px solid rgba(255,255,255,0.12); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; font-size: 13px; color: rgba(255,255,255,0.55); }

/* =========================================================
   后台 Admin
   ========================================================= */
.admin-shell { display: grid; grid-template-columns: 230px 1fr; min-height: 100vh; background: var(--c-cream); }
.admin-side { background: var(--c-ink); color: #fff; padding: 22px 16px; }
.admin-side .brand { display: flex; align-items: center; gap: 8px; padding: 6px 8px 18px; }
.admin-side .brand img { height: 24px; }
.admin-side a { display: flex; align-items: center; gap: 10px; padding: 11px 12px; border-radius: var(--r-sm); color: rgba(255,255,255,0.78); font-weight: 600; font-size: 14px; margin-bottom: 4px; }
.admin-side a:hover, .admin-side a.active { background: rgba(255,255,255,0.1); color: #fff; }
.admin-side .logout { margin-top: 18px; border-top: 1px solid rgba(255,255,255,0.12); padding-top: 14px; }
.admin-main { padding: clamp(20px,3vw,36px); }
.admin-main .topbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; flex-wrap: wrap; gap: 12px; }
.admin-card { background: var(--c-white); border: 1px solid var(--c-line); border-radius: var(--r-lg); padding: 22px; margin-bottom: 20px; }

/* 表单 */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 16px; }
.field.full { grid-column: 1 / -1; }
.field label { font-weight: 700; font-size: 14px; }
.field .hint { font-size: 12px; color: var(--c-gray); }
.input, .textarea, .select {
  font-family: var(--font-cn); font-size: 15px; padding: 11px 14px; border-radius: var(--r-sm);
  border: 1.5px solid var(--c-line-strong); background: #fff; color: var(--c-ink); width: 100%;
}
.input:focus, .textarea:focus, .select:focus { outline: none; border-color: var(--c-coral); }
.textarea { min-height: 120px; resize: vertical; line-height: 1.6; }
.checkbox-row { display: flex; align-items: center; gap: 8px; }
.checkbox-row input { width: 18px; height: 18px; accent-color: var(--c-coral); }

/* 后台表格 */
.table { width: 100%; border-collapse: collapse; font-size: 14px; }
.table th, .table td { text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--c-line); }
.table th { font-size: 12px; text-transform: uppercase; letter-spacing: .04em; color: var(--c-gray); }
.table tr:hover td { background: rgba(26,26,26,0.02); }
.table .thumb-sm { width: 64px; height: 40px; object-fit: cover; border-radius: 6px; }
.table-actions a, .table-actions button { font-size: 13px; font-weight: 700; padding: 6px 12px; border-radius: var(--r-sm); border: 1.5px solid var(--c-line-strong); background: #fff; cursor: pointer; margin-right: 6px; }
.table-actions a:hover, .table-actions button:hover { background: var(--c-ink); color: #fff; border-color: var(--c-ink); }
.btn-danger { color: var(--c-coral) !important; border-color: rgba(232,64,28,0.4) !important; }
.btn-danger:hover { background: var(--c-coral) !important; color: #fff !important; border-color: var(--c-coral) !important; }

/* 登录页 */
.login-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 24px; background: var(--c-cream); }
.login-card { background: #fff; border: 1px solid var(--c-line); border-radius: var(--r-lg); padding: 36px; width: 100%; max-width: 400px; }
.login-card .logo { height: 30px; margin: 0 auto 18px; display: block; }
.alert { padding: 11px 14px; border-radius: var(--r-sm); font-size: 14px; margin-bottom: 14px; }
.alert-error { background: #FDECEA; color: var(--c-coral-dark); border: 1px solid rgba(232,64,28,0.25); }

/* 上传预览 */
.upload-preview { margin-top: 10px; }
.upload-preview img { width: 140px; border-radius: var(--r-sm); border: 1px solid var(--c-line); }

/* 工具类 */
.mt-s { margin-top: 12px; }
.divider { height: 1px; background: var(--c-line); margin: 28px 0; }

/* =========================================================
   响应式
   ========================================================= */
@media (max-width: 940px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .nav-links, .nav-cta .btn { display: none; }
  .nav-toggle { display: block; }
  .grid-4, .form-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .admin-shell { grid-template-columns: 1fr; }
  .admin-side { display: flex; flex-wrap: wrap; gap: 4px; padding: 12px; }
  .admin-side .brand { width: 100%; padding-bottom: 8px; }
  .admin-side a { margin-bottom: 0; }
  .admin-side .logout { margin-top: 0; border-top: none; padding-top: 0; }
}