/* ============================================================
   水木硅谷 · 管理后台
   ============================================================ */
:root {
  --bg: #f4f1e9;
  --panel: #fffdf8;
  --ink: #16211d;
  --ink-soft: #46534c;
  --ink-faint: #7c867f;
  --accent: #e4552d;
  --accent-2: #0f7b6c;
  --line: #ddd6c6;
  --line-strong: #b9b0a0;
  --mono: "JetBrains Mono", "Cascadia Code", Consolas, monospace;
  --sans: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", sans-serif;
  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", serif;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: var(--sans); background: var(--bg); color: var(--ink); font-size: 14px; }
button { font-family: inherit; cursor: pointer; }
input, select, textarea { font-family: inherit; }
a { color: inherit; text-decoration: none; }
.hidden { display: none !important; }

/* ---------- 登录 ---------- */
#login {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(circle at 20% 20%, rgba(228,85,45,.12), transparent 55%),
    radial-gradient(circle at 80% 80%, rgba(15,123,108,.12), transparent 55%),
    linear-gradient(var(--grid, rgba(22,33,29,.05)) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid, rgba(22,33,29,.05)) 1px, transparent 1px);
  background-color: var(--bg);
  background-size: auto, auto, 40px 40px, 40px 40px;
  padding: 20px;
}
.login-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  width: min(400px, 100%);
  padding: 36px 34px;
  box-shadow: 0 20px 60px rgba(22,33,29,.14);
}
.login-card .logo { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.login-card .logo svg { width: 38px; height: 38px; }
.login-card h1 { font-family: var(--serif); font-size: 22px; }
.login-card .sub { font-family: var(--mono); font-size: 11px; letter-spacing: .18em; color: var(--ink-faint); margin-bottom: 24px; }
.login-card label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; color: var(--ink-soft); }
.login-card input {
  width: 100%; border: 1px solid var(--line-strong); background: var(--bg);
  border-radius: 6px; padding: 12px 14px; font-size: 15px; margin-bottom: 16px;
}
.login-card input:focus { outline: none; border-color: var(--accent-2); box-shadow: 0 0 0 3px rgba(15,123,108,.14); }
.login-card .btn { width: 100%; justify-content: center; }
.login-hint { margin-top: 14px; font-family: var(--mono); font-size: 11.5px; color: var(--ink-faint); text-align: center; }
.login-err { color: var(--accent); font-size: 12.5px; margin-top: 4px; display: none; }

/* ---------- 框架 ---------- */
#app { display: none; min-height: 100vh; }
#app.on { display: block; }
.sidebar {
  position: fixed; left: 0; top: 0; bottom: 0; width: 220px;
  background: var(--ink); color: #aebcb5;
  display: flex; flex-direction: column; z-index: 20;
}
.sidebar .brand {
  display: flex; align-items: center; gap: 10px;
  padding: 20px 18px; border-bottom: 1px solid rgba(255,253,248,.1);
  color: var(--panel); font-family: var(--serif); font-size: 17px;
}
.sidebar .brand small { display: block; font-family: var(--mono); font-size: 8.5px; letter-spacing: .24em; color: #77877f; }
.sidebar nav { flex: 1; padding: 14px 10px; overflow-y: auto; }
.sidebar nav a {
  display: flex; align-items: center; gap: 10px;
  padding: 11px 14px; border-radius: 6px; margin-bottom: 4px;
  font-size: 14px; color: #b9c6c0; transition: .15s;
}
.sidebar nav a:hover { background: rgba(255,253,248,.06); color: #fff; }
.sidebar nav a.active { background: var(--accent); color: #fff; font-weight: 600; }
.sidebar .foot { padding: 14px 18px; border-top: 1px solid rgba(255,253,248,.1); font-family: var(--mono); font-size: 10.5px; color: #77877f; }

.main { margin-left: 220px; padding: 24px 28px 60px; }
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 22px; gap: 12px; flex-wrap: wrap;
}
.topbar h2 { font-family: var(--serif); font-size: 22px; }
.topbar .meta { font-family: var(--mono); font-size: 11px; color: var(--ink-faint); letter-spacing: .1em; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  border: 1px solid var(--line-strong); background: var(--panel); color: var(--ink);
  border-radius: 6px; padding: 9px 16px; font-size: 13.5px; font-weight: 600; transition: .18s;
}
.btn:hover { border-color: var(--ink); }
.btn--accent { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn--accent:hover { background: #c23a16; }
.btn--ghost { background: transparent; }
.btn--sm { padding: 6px 11px; font-size: 12.5px; }
.btn--danger { color: var(--accent); border-color: rgba(228,85,45,.4); }
.btn--danger:hover { background: rgba(228,85,45,.08); }

/* ---------- 卡片 / 统计 ---------- */
.cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 22px; }
.stat-card {
  background: var(--panel); border: 1px solid var(--line); border-radius: 8px;
  padding: 18px 20px; position: relative; overflow: hidden;
}
.stat-card .lbl { font-size: 12.5px; color: var(--ink-faint); }
.stat-card .num { font-family: var(--serif); font-size: 30px; margin-top: 6px; color: var(--accent-deep, #c23a16); }
.stat-card .num small { font-size: 15px; color: var(--ink-faint); }
.stat-card .tag { position: absolute; right: 14px; top: 14px; font-family: var(--mono); font-size: 10px; color: var(--accent-2); letter-spacing: .12em; }

.panel {
  background: var(--panel); border: 1px solid var(--line); border-radius: 8px;
  margin-bottom: 20px; overflow: hidden;
}
.panel-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 18px; border-bottom: 1px solid var(--line);
  font-weight: 700; font-size: 15px;
}
.panel-head .sub { font-family: var(--mono); font-size: 11px; color: var(--ink-faint); font-weight: 400; letter-spacing: .08em; }

table.tbl { width: 100%; border-collapse: collapse; font-size: 13px; }
.tbl th, .tbl td { text-align: left; padding: 11px 14px; border-bottom: 1px solid var(--line); vertical-align: middle; }
.tbl th { background: var(--bg); font-family: var(--mono); font-size: 11px; letter-spacing: .1em; color: var(--ink-soft); font-weight: 600; }
.tbl tr:hover td { background: rgba(15,123,108,.04); }
.tbl .mono { font-family: var(--mono); font-size: 12px; }
.tbl .price { font-family: var(--mono); color: var(--accent); font-weight: 700; }
.tbl .status { padding: 3px 10px; border-radius: 999px; font-size: 12px; border: 1px solid var(--line-strong); background: var(--bg); }
.tbl select.status { cursor: pointer; }
.tbl .empty { text-align: center; color: var(--ink-faint); padding: 40px 0 !important; }

.badge { display: inline-block; padding: 2px 9px; border-radius: 3px; font-size: 11px; }
.badge--kit { background: rgba(228,85,45,.1); color: #c23a16; }
.badge--course { background: rgba(15,123,108,.1); color: #0a5d52; }

/* ---------- 弹窗 ---------- */
.mask {
  position: fixed; inset: 0; background: rgba(22,33,29,.5); z-index: 100;
  display: flex; align-items: center; justify-content: center; padding: 18px;
  opacity: 0; visibility: hidden; transition: .2s;
}
.mask.open { opacity: 1; visibility: visible; }
.modal {
  background: var(--panel); border-radius: 8px; width: min(560px, 100%);
  max-height: 90vh; overflow-y: auto; transform: translateY(16px); transition: .25s;
}
.mask.open .modal { transform: none; }
.modal-head { display: flex; align-items: center; justify-content: space-between; padding: 16px 20px; border-bottom: 1px solid var(--line); }
.modal-head h3 { font-family: var(--serif); font-size: 18px; }
.modal-x { background: none; border: 1px solid var(--line); width: 30px; height: 30px; border-radius: 50%; color: var(--ink-soft); }
.modal-x:hover { border-color: var(--accent); color: var(--accent); }
.modal-body { padding: 20px; }
.f-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.field { margin-bottom: 14px; }
.field label { display: block; font-size: 12.5px; font-weight: 600; color: var(--ink-soft); margin-bottom: 5px; }
.field input, .field select, .field textarea {
  width: 100%; border: 1px solid var(--line-strong); background: var(--bg);
  border-radius: 6px; padding: 10px 12px; font-size: 14px;
}
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--accent-2); }
.modal-foot { display: flex; justify-content: flex-end; gap: 10px; padding-top: 6px; }

/* ---------- Toast ---------- */
#toast {
  position: fixed; left: 50%; bottom: 30px; transform: translateX(-50%) translateY(16px);
  background: var(--ink); color: var(--panel); padding: 11px 20px; border-radius: 6px;
  font-size: 13.5px; opacity: 0; transition: .25s; z-index: 300; box-shadow: 0 10px 30px rgba(22,33,29,.3);
}
#toast.on { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- 移动适配 ---------- */
@media (max-width: 900px) {
  .cards { grid-template-columns: repeat(2, 1fr); }
  .sidebar { width: 64px; }
  .sidebar .brand { justify-content: center; padding: 16px 0; }
  .sidebar .brand span { display: none; }
  .sidebar nav a { justify-content: center; padding: 12px 0; font-size: 16px; }
  .sidebar nav a span { display: none; }
  .sidebar .foot { display: none; }
  .main { margin-left: 64px; padding: 18px 14px 50px; }
  .f-row { grid-template-columns: 1fr; }
  .tbl-wrap { overflow-x: auto; }
}