/* 阶段二 · 浅色专业后台（沿用阶段一视觉口径） */
:root {
  --bg: #f4f6fa; --surface: #ffffff; --surface-2: #f8fafd;
  --text-1: #1c2333; --text-2: #5a6478; --text-3: #98a1b3;
  --border: #e3e8f0; --border-2: #d4dbe7;
  --primary: #2f6bff; --primary-dark: #1f4fd8;
  --success: #12915f; --warn: #b7791f; --danger: #d64545;
  --radius: 10px; --shadow: 0 1px 2px rgba(28,35,51,.05), 0 4px 14px rgba(28,35,51,.05);
}
* { box-sizing: border-box; }
body { margin: 0; font: 13.5px/1.65 "Segoe UI", "Microsoft YaHei", system-ui, sans-serif; color: var(--text-1); background: var(--bg); }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
.app { display: flex; min-height: 100vh; }
.sidebar { width: 216px; flex: 0 0 216px; background: var(--surface); border-right: 1px solid var(--border); padding: 16px 12px; position: sticky; top: 0; height: 100vh; overflow-y: auto; }
.brand { display: flex; gap: 10px; align-items: center; margin-bottom: 14px; }
.brand-mark { width: 34px; height: 34px; border-radius: 9px; background: linear-gradient(135deg, var(--primary), #6aa0ff); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 700; }
.brand-title { font-weight: 700; }
.brand-sub { font-size: 11px; color: var(--text-3); }
.nav-group { font-size: 11px; color: var(--text-3); margin: 14px 8px 4px; letter-spacing: .06em; }
.nav-item { display: flex; gap: 8px; align-items: center; padding: 8px 10px; border-radius: 8px; color: var(--text-2); margin: 1px 0; }
.nav-item:hover { background: var(--surface-2); text-decoration: none; color: var(--text-1); }
.nav-item.active { background: #eaf0ff; color: var(--primary-dark); font-weight: 600; }
.sidebar-foot { margin-top: 18px; font-size: 11px; color: var(--text-3); padding: 10px 8px; border-top: 1px dashed var(--border); }
.main { flex: 1; min-width: 0; }
.topbar { display: flex; align-items: center; gap: 16px; background: var(--surface); border-bottom: 1px solid var(--border); padding: 10px 22px; position: sticky; top: 0; z-index: 20; }
.crumb { color: var(--text-2); font-size: 12.5px; }
.search-form { flex: 1; max-width: 460px; }
.search-form input { width: 100%; padding: 7px 12px; border: 1px solid var(--border-2); border-radius: 8px; background: var(--surface-2); }
.avatar { width: 30px; height: 30px; border-radius: 50%; background: #e7ecf5; color: var(--text-2); display: flex; align-items: center; justify-content: center; font-size: 12.5px; font-weight: 600; }
.content { padding: 20px 22px 40px; max-width: 1200px; }
.page-head { display: flex; align-items: flex-start; gap: 12px; margin-bottom: 14px; }
.page-head h1 { font-size: 19px; margin: 0; }
.page-head p { margin: 2px 0 0; color: var(--text-2); font-size: 12.5px; }
.spacer { flex: 1; }
.head-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.panel { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); margin-bottom: 16px; }
.panel-head { display: flex; align-items: center; gap: 10px; padding: 12px 16px; border-bottom: 1px solid var(--border); }
.panel-head h2 { font-size: 14.5px; margin: 0; }
.panel-body { padding: 14px 16px; }
.panel-body.tight { padding: 4px 8px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.stat-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 12px; margin-bottom: 16px; }
.stat { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 13px 15px; box-shadow: var(--shadow); }
.stat .k { font-size: 12px; color: var(--text-2); }
.stat .v { font-size: 19px; font-weight: 700; margin-top: 3px; font-variant-numeric: tabular-nums; }
.stat .s { font-size: 11.5px; color: var(--text-3); margin-top: 2px; }
.table-wrap { width: 100%; overflow-x: auto; }
table.dt { width: 100%; border-collapse: collapse; font-size: 12.5px; }
table.dt th { text-align: left; padding: 9px 10px; background: var(--surface-2); color: var(--text-2); font-weight: 600; white-space: nowrap; border-bottom: 1px solid var(--border); }
table.dt td { padding: 9px 10px; border-bottom: 1px solid #eef1f5; vertical-align: middle; }
table.dt tr:last-child td { border-bottom: 0; }
table.dt tr:hover td { background: #fafbfe; }
td.right, th.right { text-align: right; }
.num { font-variant-numeric: tabular-nums; }
.mono { font-family: Consolas, monospace; font-size: 12px; }
.badge { display: inline-block; padding: 1.5px 8px; border-radius: 999px; font-size: 11.5px; font-weight: 500; background: #eef1f6; color: var(--text-2); white-space: nowrap; }
.b-green { background: #e2f5ec; color: var(--success); }
.b-warn { background: #fdf3df; color: var(--warn); }
.b-red { background: #fde8e8; color: var(--danger); }
.b-blue { background: #e7f0ff; color: var(--primary-dark); }
.b-purple { background: #f0e9fd; color: #6d43d6; }
.btn { display: inline-block; padding: 7px 14px; border-radius: 8px; border: 1px solid var(--border-2); background: var(--surface); color: var(--text-1); cursor: pointer; font-size: 12.5px; }
.btn:hover { border-color: var(--primary); color: var(--primary-dark); text-decoration: none; }
.btn-primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); color: #fff; }
.btn-danger { border-color: #eccaca; color: var(--danger); background: #fff; }
.btn-sm { padding: 3.5px 10px; font-size: 12px; }
.btn-block { display: block; width: 100%; text-align: center; }
.filters { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; margin-bottom: 12px; }
.filters select, .filters input { padding: 6px 10px; border: 1px solid var(--border-2); border-radius: 8px; background: var(--surface); font-size: 12.5px; }
.lbl { font-size: 12px; color: var(--text-2); }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 14px; }
.field { display: flex; flex-direction: column; gap: 4px; }
.field.full { grid-column: 1 / -1; }
.field label { font-size: 12px; color: var(--text-2); font-weight: 600; }
.field input, .field select, .field textarea { padding: 8px 10px; border: 1px solid var(--border-2); border-radius: 8px; font: inherit; background: var(--surface); }
.field .hint { font-size: 11.5px; color: var(--text-3); }
.req { color: var(--danger); }
.checkline label { display: inline-flex; gap: 6px; align-items: center; margin-right: 14px; font-size: 12.5px; }
.callout { background: var(--surface-2); border: 1px solid var(--border); border-left: 3px solid var(--primary); border-radius: 8px; padding: 10px 13px; font-size: 12.5px; margin: 10px 0; }
.callout.warn { border-left-color: var(--warn); }
.callout.danger { border-left-color: var(--danger); }
.kv { display: grid; grid-template-columns: 130px 1fr; gap: 5px 14px; font-size: 12.5px; margin: 6px 0; }
.kv .k { color: var(--text-2); }
.kv .v { font-weight: 500; }
.tl { border-left: 2px solid var(--border); margin: 8px 0 4px 6px; padding-left: 16px; }
.tl-item { margin-bottom: 12px; position: relative; }
.tl-item::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--border-2); position: absolute; left: -20.5px; top: 5px; }
.tl-item.bill::before, .tl-item.payment::before { background: var(--primary); }
.tl-item.price::before { background: var(--warn); }
.tl-item.exception::before { background: var(--danger); }
.tl-item .t { font-size: 11.5px; color: var(--text-3); }
.tl-item .h { font-weight: 600; font-size: 12.5px; }
.tl-item .d { font-size: 12px; color: var(--text-2); }
.flash { position: fixed; bottom: 18px; right: 18px; z-index: 100; display: flex; flex-direction: column; gap: 8px; max-width: 420px; }
.flash .msg { background: var(--surface); border: 1px solid var(--border); border-left: 3px solid var(--primary); border-radius: 8px; padding: 10px 14px; box-shadow: var(--shadow); font-size: 12.5px; animation: fadein .2s; }
.flash .msg.ok { border-left-color: var(--success); }
.flash .msg.err { border-left-color: var(--danger); }
@keyframes fadein { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; } }
.att-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 12px; }
.att-card { border: 1px solid var(--border); border-radius: 8px; overflow: hidden; background: var(--surface); }
.att-thumb { height: 110px; background: var(--surface-2); display: flex; align-items: center; justify-content: center; color: var(--text-3); }
.att-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.att-card .n { font-size: 12.5px; font-weight: 600; padding: 8px 10px 0; word-break: break-all; }
.att-card .m { font-size: 11.5px; color: var(--text-3); padding: 0 10px 8px; }
.empty { padding: 34px; text-align: center; color: var(--text-3); }
.empty .t { font-weight: 600; color: var(--text-2); }
details.box { border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); margin-bottom: 14px; }
details.box > summary { cursor: pointer; padding: 11px 16px; font-weight: 600; list-style: none; }
details.box[open] > summary { border-bottom: 1px solid var(--border); }
details.box .panel-body { padding: 14px 16px; }
.doc h3 { font-size: 13.5px; margin: 14px 0 4px; }
.doc p, .doc li { font-size: 12.5px; color: var(--text-2); }
code { background: var(--surface-2); border: 1px solid var(--border); border-radius: 4px; padding: 1px 5px; font-size: 12px; }
.login-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: var(--bg); }
.login-box { width: 340px; background: var(--surface); border: 1px solid var(--border); border-radius: 12px; box-shadow: var(--shadow); padding: 26px; }
.login-box h1 { font-size: 17px; margin: 0 0 4px; }
.login-box .sub { color: var(--text-2); font-size: 12.5px; margin-bottom: 16px; }
.strong { font-weight: 700; }
.dim { color: var(--text-3); font-size: 12px; }
@media (max-width: 900px) {
  .sidebar { display: none; }
  .grid-2, .grid-3, .form-grid { grid-template-columns: 1fr; }
  .content { padding: 14px 12px 32px; }
  .topbar { padding: 8px 12px; flex-wrap: wrap; }
}

/* ===== 移动端顶部菜单（≤900px 显示，纯 CSS details 折叠） ===== */
.mnav { display: none; position: relative; }
.mbtn { cursor: pointer; user-select: none; padding: 6px 10px; border: 1px solid var(--border-2);
  border-radius: 8px; background: var(--surface); font-size: 12.5px; color: var(--text-2); list-style: none; }
.mbtn::-webkit-details-marker { display: none; }
.mnav-pop { position: absolute; right: 0; top: calc(100% + 6px); z-index: 50; min-width: 170px;
  background: var(--surface); border: 1px solid var(--border); border-radius: 10px; box-shadow: var(--shadow);
  padding: 6px; display: flex; flex-direction: column; }
.mnav-pop a { padding: 8px 10px; border-radius: 7px; color: var(--text-2); font-size: 13px; white-space: nowrap; }
.mnav-pop a:hover { background: var(--surface-2); text-decoration: none; color: var(--text-1); }
.mnav-pop a.logout { color: var(--danger); border-top: 1px dashed var(--border); margin-top: 4px; border-radius: 0 0 7px 7px; }
@media (max-width: 900px) {
  .mnav { display: block; }
}