:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --fg: #1c2024;
  --muted: #6b7280;
  --line: #e5e7eb;
  --accent: #2563eb;
  --ok-bg: #e7f6ec;
  --ok-fg: #157347;
  --bad-bg: #fdecec;
  --bad-fg: #b42318;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 1px 3px rgba(16, 24, 40, .1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14171a;
    --card: #1c2024;
    --fg: #e8eaed;
    --muted: #9aa1ab;
    --line: #2a2f35;
    --accent: #7aa2ff;
    --ok-bg: #16321f;
    --ok-fg: #6fd28f;
    --bad-bg: #3a1d1d;
    --bad-fg: #ff9b93;
    --shadow: none;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 15px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* 顶栏 */
.topbar {
  background: var(--card);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
}
.topbar-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 10px 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  align-items: center;
}
.brand { display: inline-flex; align-items: center; gap: 8px; color: var(--fg); font-weight: 600; }
.brand-mark {
  background: var(--accent);
  color: #fff;
  border-radius: 8px;
  padding: 2px 8px;
  font-size: 13px;
  letter-spacing: 1px;
}
.brand-text small { color: var(--muted); font-weight: 400; margin-left: 6px; }

.nav { display: flex; flex-wrap: wrap; gap: 6px; }
.nav-item {
  padding: 6px 10px;
  border-radius: 8px;
  font-size: 14px;
  color: var(--fg);
  white-space: nowrap;
}
.nav-item.is-active { background: var(--accent); color: #fff; }
.nav-item.is-disabled { color: var(--muted); opacity: .55; cursor: not-allowed; }

/* 主体 */
.page { max-width: 1080px; margin: 0 auto; padding: 20px 16px 40px; }
.hero h1 { margin: 8px 0 4px; font-size: 24px; }
.muted { color: var(--muted); }
.small { font-size: 13px; }

.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); margin-top: 16px; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
}
.card h2 { margin: 0 0 12px; font-size: 16px; }

.kv { display: grid; grid-template-columns: auto 1fr; gap: 6px 12px; margin: 0; }
.kv dt { color: var(--muted); font-size: 13px; }
.kv dd { margin: 0; word-break: break-all; }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 13px; }

.badge { display: inline-block; padding: 1px 8px; border-radius: 999px; font-size: 12px; }
.badge-ok { background: var(--ok-bg); color: var(--ok-fg); }
.badge-bad { background: var(--bad-bg); color: var(--bad-fg); }

.list, .steps { margin: 0; padding-left: 18px; }
.list li, .steps li { margin: 4px 0; }
.steps li { color: var(--muted); }
.steps li.is-done { color: var(--fg); font-weight: 600; }
.tag {
  margin-left: 6px;
  font-size: 11px;
  font-weight: 400;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0 6px;
  color: var(--muted);
}

.footer {
  max-width: 1080px;
  margin: 0 auto;
  padding: 16px;
  color: var(--muted);
  font-size: 12px;
  border-top: 1px solid var(--line);
}

/* 统计卡 */
.stats { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); margin: 16px 0; }
.stat {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 14px 16px;
  color: var(--fg);
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.stat:hover { text-decoration: none; border-color: var(--accent); }
.stat-num { font-size: 26px; font-weight: 700; line-height: 1.1; }
.stat-label { color: var(--muted); font-size: 13px; }

/* 页头与卡片头 */
.page-head { margin: 4px 0 16px; }
.page-head h1 { margin: 0 0 4px; font-size: 22px; }
.card-head { display: flex; flex-wrap: wrap; gap: 8px; align-items: baseline; justify-content: space-between; margin-bottom: 10px; }
.card-head h2 { margin: 0; }
.link { font-size: 13px; }

/* 提示条 */
.flash { border-radius: var(--radius); padding: 10px 14px; margin-bottom: 14px; font-size: 14px; border: 1px solid transparent; }
.flash-ok { background: var(--ok-bg); color: var(--ok-fg); border-color: var(--ok-fg); }
.flash-err { background: var(--bad-bg); color: var(--bad-fg); border-color: var(--bad-fg); }

/* 表单 */
.form-grid { display: grid; gap: 10px 14px; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); align-items: end; }
.field { display: flex; flex-direction: column; gap: 4px; font-size: 13px; }
.field > span { color: var(--muted); }
.field em { color: var(--bad-fg); font-style: normal; }
.field-wide { grid-column: 1 / -1; }
input, select, textarea {
  font: inherit;
  color: var(--fg);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 7px 9px;
  width: 100%;
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.form-actions { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; grid-column: 1 / -1; }

/* 按钮 */
.btn {
  font: inherit;
  font-size: 14px;
  cursor: pointer;
  background: var(--card);
  color: var(--fg);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 7px 12px;
}
.btn:hover { border-color: var(--accent); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-danger { color: var(--bad-fg); border-color: var(--bad-fg); }
.btn-sm { font-size: 13px; padding: 4px 9px; }

/* 表格 */
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
table.data { width: 100%; border-collapse: collapse; font-size: 14px; }
table.data th, table.data td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
table.data th { color: var(--muted); font-weight: 500; font-size: 13px; white-space: nowrap; }
table.data tr:last-child td { border-bottom: none; }

/* 行内操作 */
.actions { display: flex; flex-wrap: wrap; gap: 6px; align-items: flex-start; }
.inline { display: inline; }
details.edit > summary { list-style: none; display: inline-block; }
details.edit > summary::-webkit-details-marker { display: none; }
details.edit[open] > summary { margin-bottom: 10px; }
details.edit > form { background: var(--bg); border: 1px solid var(--line); border-radius: 8px; padding: 12px; margin-top: 8px; min-width: 260px; }
.danger-zone { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; grid-column: 1 / -1; border-top: 1px dashed var(--line); padding-top: 10px; }
.danger-zone p { margin: 0; }

/* 学期筛选 chips */
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { border: 1px solid var(--line); border-radius: 999px; padding: 4px 12px; font-size: 13px; color: var(--fg); }
.chip.is-active { background: var(--accent); border-color: var(--accent); color: #fff; }

.empty { color: var(--muted); font-size: 14px; margin: 6px 0; }

/* 批量录入表格：格子输入框收窄，方便一屏看多列 */
table.data.bulk td { padding: 4px 6px; }
table.data.bulk td:first-child { white-space: nowrap; }
input.cell { min-width: 76px; text-align: center; padding: 6px 4px; }
select.is-empty { color: var(--bad-fg); }
.card-err { border-color: var(--bad-fg); }

/* 趋势分析 */
.chart { width: 100%; height: 340px; margin-top: 6px; }
.checks { display: flex; flex-wrap: wrap; gap: 6px 14px; }
.check { display: inline-flex; align-items: center; gap: 5px; font-size: 14px; color: var(--fg); }
.check input { width: auto; }
.data-details > summary { list-style: none; display: inline-block; margin-top: 10px; }
.data-details > summary::-webkit-details-marker { display: none; }
.data-details[open] > summary { margin-bottom: 10px; }
.flags { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.flag { display: flex; flex-wrap: wrap; gap: 8px; align-items: baseline; font-size: 14px; border-left: 3px solid var(--line); padding: 6px 10px; background: var(--bg); border-radius: 6px; }
.flag-warn { border-left-color: var(--bad-fg); }
.flag-info { border-left-color: var(--accent); }

/* 学期报告 */
.report-head { display: flex; flex-wrap: wrap; gap: 12px; align-items: flex-start; justify-content: space-between; }
.report-actions { display: flex; gap: 8px; }
.report-title { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; justify-content: space-between; }
.report-title-main h2 { margin: 0 0 4px; }
.report-score { display: flex; flex-direction: column; align-items: flex-end; gap: 6px; }
.report-big { font-size: 34px; font-weight: 700; line-height: 1; color: var(--accent); }
.summary-list { margin: 0; padding-left: 20px; display: flex; flex-direction: column; gap: 8px; font-size: 15px; line-height: 1.7; }
.chart-fallback { display: flex; align-items: center; justify-content: center; text-align: center; padding: 20px; color: var(--muted); border: 1px dashed var(--line); border-radius: 8px; }

/* 打印 / 另存为 PDF：隐藏导航与操作区，卡片不被切断 */
/* 退出登录按钮：放在导航右侧，不占主导航的视觉权重 */
.logout-form { margin-left: auto; }
.logout-form .btn { background: transparent; }
.btn-block { width: 100%; justify-content: center; }

/* 登录页：独立一屏，不套用后台布局 */
.login-body { display: flex; align-items: center; justify-content: center; min-height: 100vh; padding: 20px; }
.login-wrap { width: 100%; max-width: 380px; }
.login-card {
  display: flex; flex-direction: column; gap: 14px;
  /* min-width:0 + overflow-wrap：卡片内出现长且不可断的路径（如 /opt/xueji/deploy/重置码.txt）时，
     卡片会跟着内容的 min-content 宽度被撑出手机屏幕（390px 实测被裁）。 */
  min-width: 0; overflow-wrap: anywhere;
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 22px 20px 18px;
  box-shadow: 0 8px 24px rgb(0 0 0 / 6%);
}
.login-brand { display: flex; align-items: center; gap: 10px; }
.login-brand-text { display: flex; flex-direction: column; line-height: 1.35; }
.login-brand-text strong { font-size: 16px; }
.login-brand-text small { color: var(--muted); font-size: 12px; }
.login-note { color: var(--muted); font-size: 12px; margin: 2px 0 0; overflow-wrap: anywhere; }

@media print {
  .nav, .footer, .no-print, .report-actions, .data-details > summary { display: none !important; }
  body { background: #fff; color: #000; }
  .card { box-shadow: none; border: 1px solid #d0d0d0; break-inside: avoid; page-break-inside: avoid; margin-bottom: 10px; }
  .report-big { color: #000; }
  .chart { height: 280px; }
  a[href]::after { content: ""; }
  table.data { font-size: 12px; }
}

@media (max-width: 600px) {
  .hero h1 { font-size: 20px; }
  .nav { gap: 2px; }
  .nav-item { padding: 5px 8px; font-size: 13px; }
  .page { padding: 14px 12px 32px; }
  .form-grid { grid-template-columns: 1fr; }
  .stat-num { font-size: 22px; }
  details.edit > form { min-width: 0; }
}