:root {
  --blue: #1a5fb4;
  --blue-d: #15489a;
  --blue-l: #e8f0fb;
  --ink: #1f2733;
  --muted: #6b7785;
  --line: #e3e8ef;
  --bg: #f5f7fa;
  --green: #2e9e5b;
  --red: #d9534f;
  --amber: #e0a106;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, sans-serif;
  background: var(--bg); color: var(--ink); line-height: 1.6;
}
.loading { text-align: center; padding: 80px; color: var(--muted); }
a { color: var(--blue); }

/* 顶部条 */
.topbar {
  background: linear-gradient(120deg, var(--blue), var(--blue-d));
  color: #fff; padding: 14px 22px; display: flex; align-items: center;
  justify-content: space-between; box-shadow: 0 2px 8px rgba(0,0,0,.12);
}
.topbar .brand { font-size: 18px; font-weight: 700; letter-spacing: .5px; }
.topbar .brand small { font-weight: 400; opacity: .8; margin-left: 8px; font-size: 12px; }
.topbar .brand .logo-img { height: 32px; width: auto; border-radius: 50%; vertical-align: middle; margin-right: 6px; object-fit: cover; }
.logo-lg { width: 100px; height: auto; border-radius: 12px; }
.logo-sm { height: 28px; width: auto; border-radius: 50%; vertical-align: middle; margin-right: 6px; }
.topbar .user { font-size: 14px; display: flex; align-items: center; gap: 12px; }
.topbar .user b { font-weight: 600; }
.btn-ghost {
  background: rgba(255,255,255,.15); border: 1px solid rgba(255,255,255,.4);
  color: #fff; padding: 5px 12px; border-radius: 6px; cursor: pointer; font-size: 13px;
}
.btn-ghost:hover { background: rgba(255,255,255,.28); }

/* 容器 */
.wrap { max-width: 960px; margin: 0 auto; padding: 26px 18px 60px; }

/* 卡片 / 表单 */
.card {
  background: #fff; border: 1px solid var(--line); border-radius: 12px;
  padding: 26px; box-shadow: 0 1px 3px rgba(0,0,0,.04);
}
.auth-box { max-width: 400px; margin: 60px auto; }
.auth-box h2 { margin: 0 0 4px; color: var(--blue-d); }
.auth-box .sub { color: var(--muted); font-size: 13px; margin-bottom: 20px; }
.field { margin-bottom: 14px; }
.field label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 5px; }
.field input, .field select {
  width: 100%; padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px;
  font-size: 14px; outline: none; background: #fff; color: var(--ink);
}
.field input:focus, .field select:focus { border-color: var(--blue); box-shadow: 0 0 0 3px var(--blue-l); }
.btn {
  width: 100%; padding: 11px; border: none; border-radius: 8px; background: var(--blue);
  color: #fff; font-size: 15px; cursor: pointer; font-weight: 600;
}
.btn:hover { background: var(--blue-d); }
.btn-sm { width: auto; padding: 6px 12px; font-size: 13px; }
.btn-green { background: var(--green); } .btn-green:hover { background: #258a4e; }
.btn-red { background: var(--red); } .btn-red:hover { background: #c0433f; }
.switch { text-align: center; margin-top: 14px; font-size: 13px; color: var(--muted); }
.switch a { cursor: pointer; }
.link-btn { color: var(--blue-d); text-decoration: underline; cursor: pointer; font-size: 13px; }
.link-btn:hover { color: var(--blue); }
.msg { font-size: 13px; padding: 9px 12px; border-radius: 8px; margin-bottom: 14px; }
.msg.err { background: #fdecea; color: var(--red); border: 1px solid #f5c6c2; }
.msg.ok { background: #eaf7ee; color: var(--green); border: 1px solid #bfe6cb; }

/* 登录页：友情提示框（仿 dyshuxue 风格） */
.tip-box {
  background: #fff8e6; border: 1px solid #ffe2a8; color: #8a6100;
  padding: 10px 14px; border-radius: 8px; font-size: 13px; line-height: 1.7; margin-bottom: 18px;
}
/* 登录页：保存时间单选 */
.save-row { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; font-size: 13px; color: var(--muted); margin-bottom: 18px; }
.save-label { color: var(--ink); font-weight: 600; }
.save-opt { display: inline-flex; align-items: center; gap: 4px; cursor: pointer; }
.save-opt input { accent-color: var(--blue); width: auto; }

/* 标签筛选 */
.toolbar { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-bottom: 18px; }
.search { flex: 1; min-width: 180px; padding: 9px 12px; border: 1px solid var(--line); border-radius: 8px; font-size: 14px; }
.chip {
  padding: 7px 14px; border: 1px solid var(--line); border-radius: 999px; cursor: pointer;
  font-size: 13px; background: #fff; color: var(--muted);
}
.chip.active { background: var(--blue); color: #fff; border-color: var(--blue); }

/* 文件列表 */
.file-list { display: grid; gap: 12px; }
.file-item {
  display: flex; align-items: center; gap: 14px; background: #fff; border: 1px solid var(--line);
  border-radius: 10px; padding: 14px 16px;
}
.file-ic {
  width: 44px; height: 44px; border-radius: 8px; display: grid; place-items: center;
  font-size: 12px; font-weight: 700; color: #fff; flex-shrink: 0;
}
.ic-doc { background: #2b6cb0; } .ic-pdf { background: #c0392b; }
.ic-ppt { background: #c05621; } .ic-other { background: #77808a; }
.file-meta { flex: 1; min-width: 0; }
.file-meta .nm { font-weight: 600; font-size: 15px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.file-meta .info { font-size: 12px; color: var(--muted); }
.tag { background: var(--blue-l); color: var(--blue-d); padding: 1px 8px; border-radius: 6px; font-size: 12px; }

/* 管理员标签页 */
.tabs { display: flex; gap: 6px; border-bottom: 1px solid var(--line); margin-bottom: 20px; }
.tab {
  padding: 9px 16px; cursor: pointer; font-size: 14px; color: var(--muted);
  border-bottom: 2px solid transparent; margin-bottom: -1px;
}
.tab.active { color: var(--blue-d); border-bottom-color: var(--blue); font-weight: 600; }
.section-title { font-size: 15px; font-weight: 700; margin: 0 0 12px; color: var(--ink); }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.upload-row input[type=file] { font-size: 13px; }
table.tbl { width: 100%; border-collapse: collapse; font-size: 13px; }
table.tbl th, table.tbl td { text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--line); }
table.tbl th { color: var(--muted); font-weight: 600; background: #fafbfc; }
.badge { padding: 2px 8px; border-radius: 6px; font-size: 12px; }
.badge.pending { background: #fff4d6; color: var(--amber); }
.badge.active { background: #eaf7ee; color: var(--green); }
.badge.rejected { background: #fdecea; color: var(--red); }
.empty { text-align: center; color: var(--muted); padding: 40px; }
.hint { font-size: 12px; color: var(--muted); margin-top: 8px; }
code.inv { background: #f0f3f7; padding: 2px 8px; border-radius: 6px; font-size: 13px; letter-spacing: .5px; }
.stat-row { display: flex; gap: 14px; flex-wrap: wrap; }
.stat { flex: 1; min-width: 120px; background: #f5f8fc; border: 1px solid var(--line); border-radius: 10px; padding: 16px; text-align: center; }
.stat b { display: block; font-size: 28px; color: var(--blue); }
.stat span { font-size: 12px; color: var(--muted); }

/* 申请会员页 · 收款二维码占位 */
.qr-box { border: 1px solid var(--line); border-radius: 12px; padding: 18px; text-align: center; margin: 8px 0 14px; background: #fff; }
.qr-img { width: 180px; height: 180px; border-radius: 8px; object-fit: contain; }
.qr-ph { width: 150px; height: 150px; margin: 0 auto 8px; border-radius: 8px; background: #fff; display: grid; place-items: center;
  color: var(--muted); font-size: 13px; border: 1px solid var(--line); }
.btn-ghost-dark { background: #eef2f7; border: 1px solid var(--line); color: var(--ink); padding: 6px 12px; border-radius: 8px; cursor: pointer; font-size: 13px; }
.btn-ghost-dark:hover { background: #e2e8f0; }

/* 文章鉴权门（未登录 / 非会员） */
.art-gate { max-width: 560px; margin: 40px auto; padding: 0 16px; }
.ag-head { text-align: center; color: var(--blue-d); font-weight: 700; letter-spacing: 2px; margin-bottom: 16px; }
.ag-card { background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 28px; box-shadow: 0 4px 18px rgba(0,0,0,.06); }
.ag-cat { display: inline-block; background: var(--blue-l); color: var(--blue-d); padding: 3px 12px; border-radius: 999px; font-size: 12px; }
.ag-title { font-size: 24px; margin: 12px 0 8px; color: var(--ink); line-height: 1.4; }
.ag-time { color: var(--muted); font-size: 13px; margin-bottom: 22px; }
.ag-sum { color: var(--muted); font-size: 14px; margin: 0 0 16px; }
.howto { background: #f6f9fc; border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px; margin: 6px 0 14px; }
.howto-h { font-weight: 700; font-size: 14px; color: var(--ink); margin-bottom: 8px; }
.howto-item { font-size: 13px; color: #445; line-height: 1.7; margin-bottom: 6px; }
.howto-item:last-child { margin-bottom: 0; }
.howto-item b { color: var(--blue-d); }
.ag-tip { background: #fff8e6; border: 1px solid #ffe2a8; color: #8a6100; padding: 10px 14px; border-radius: 8px; font-size: 13px; margin-bottom: 18px; }
.ag-btn { font-size: 16px; padding: 13px; }
.ag-join { text-align: center; margin-top: 16px; font-size: 13px; color: var(--muted); }
.ag-join a { cursor: pointer; }

/* 文章阅读页（会员） */
.art-reader { max-width: 820px; }
.ar-cat { display: inline-block; background: var(--blue-l); color: var(--blue-d); padding: 3px 12px; border-radius: 999px; font-size: 12px; }
.ar-title { font-size: 28px; margin: 12px 0 6px; line-height: 1.35; }
.ar-meta { color: var(--muted); font-size: 13px; margin-bottom: 18px; border-bottom: 1px solid var(--line); padding-bottom: 14px; }
.ar-body { font-size: 16px; line-height: 1.9; color: #28323e; }
.ar-body h2 { font-size: 20px; margin: 26px 0 10px; color: var(--blue-d); border-left: 4px solid var(--blue); padding-left: 10px; }
.ar-body p { margin: 12px 0; }
.ar-body ul { padding-left: 22px; } .ar-body li { margin: 6px 0; }

/* 会员文章列表 */
.art-list { display: grid; gap: 14px; }
.art-card { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 18px 20px; cursor: pointer; transition: .15s; }
.art-card:hover { border-color: var(--blue); box-shadow: 0 4px 14px rgba(26,95,180,.1); transform: translateY(-1px); }
.ac-cat { display: inline-block; background: var(--blue-l); color: var(--blue-d); padding: 2px 10px; border-radius: 999px; font-size: 12px; }
.ac-title { font-size: 18px; font-weight: 700; margin: 8px 0 6px; color: var(--ink); }
.ac-sum { color: var(--muted); font-size: 14px; margin: 0 0 10px; }
.ac-meta { color: var(--muted); font-size: 12px; }

/* 会员状态横幅 */
.mem-banner { display:flex; align-items:center; gap:14px; background:#eaf7ee; border:1px solid #bfe6cb; color:#1f7a45; border-radius:12px; padding:14px 18px; margin-bottom:18px; }
.mem-banner.expired { background:#fdecea; border-color:#f5c6c2; color:#c0392b; }
.mb-icon { font-size:22px; line-height:1; }
.mb-text { flex:1; }
.mb-title { font-weight:700; font-size:15px; }
.mb-sub { font-size:13px; opacity:.9; margin-top:2px; }
.mb-link { display:inline-block; margin-top:8px; background:var(--green); color:#fff; padding:7px 16px; border-radius:8px; cursor:pointer; font-size:14px; }
.mb-link:hover { filter:brightness(.95); }

/* 管理员续费标记 / 文章到期提示 */
.badge.renew { background:#fff4e5; color:#b8690a; border:1px solid #f0c890; margin-left:4px; }
.expired-tip { background:#fdecea; color:#c0392b; border:1px solid #f5c6c2; padding:10px 14px; border-radius:8px; }

/* 极简文章锁屏页（对标图2） */
.art-gate-simple { max-width: 480px; margin: 32px auto 40px; padding: 0 20px; text-align: center; }
.ag-title-red { color: #c0392b; font-size: 26px; font-weight: 700; margin: 8px 0 12px; line-height: 1.4; word-break: break-word; }
.ag-time { color: var(--muted); font-size: 13px; margin-bottom: 8px; }
.ag-btn-big { display: inline-block; width: 100%; max-width: 280px; font-size: 18px; padding: 16px 0; border-radius: 10px; letter-spacing: 4px; margin-top: 24px; cursor: pointer; color: #fff; }
.ag-footer { margin-top: 24px; font-size: 13px; color: var(--muted); }
.ag-footer a { color: var(--blue-d); cursor: pointer; text-decoration: underline; }

/* 全站备案号页脚 */
.site-footer { margin-top: 40px; padding: 18px 12px; text-align: center; font-size: 12px; line-height: 1.7; color: var(--muted); border-top: 1px solid var(--line); }
.site-footer a { color: var(--muted); text-decoration: underline; }