/* ============================================
   班级考勤违纪管理系统 全局样式
   布局方案：CSS Grid（不使用 Flexbox 做主要布局）
   ============================================ */

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

:root {
  --bg: #f4f6f9;
  --card: #ffffff;
  --line: #e3e8ef;
  --text: #1f2733;
  --muted: #6b7686;
  --primary: #1d6ff2;
  --primary-dark: #1758c4;
  --danger: #e5484d;
  --ok: #2fa84f;
  --side-bg: #16233b;
  --side-text: #c4cede;
}

body {
  font-family: "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.6;
}

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

/* ===== 整体布局：左侧栏 + 主区（Grid）===== */
.layout {
  display: grid;
  grid-template-columns: 210px 1fr;
  min-height: 100vh;
}

.sidebar {
  background: var(--side-bg);
  color: var(--side-text);
  display: grid;
  grid-template-rows: auto 1fr auto;
  position: sticky;
  top: 0;
  height: 100vh;
  align-self: start;
}

.brand {
  padding: 18px 16px;
  font-size: 15px;
  font-weight: 700;
  color: #ffffff;
  border-bottom: 1px solid rgba(255,255,255,.08);
}

.nav {
  padding: 10px 8px;
  display: grid;
  gap: 4px;
  align-content: start;
}

.nav-item {
  display: block;
  padding: 9px 12px;
  border-radius: 6px;
  color: var(--side-text);
  font-size: 14px;
}
.nav-item:hover { background: rgba(255,255,255,.08); color: #fff; text-decoration: none; }
.nav-item.active { background: var(--primary); color: #fff; }

.sidebar-foot {
  padding: 14px;
  display: grid;
  gap: 8px;
  border-top: 1px solid rgba(255,255,255,.08);
}
.who { font-size: 13px; color: var(--side-text); }
.logout { color: #ffb4b6; font-size: 13px; }

.main {
  padding: 22px 24px;
  display: grid;
  gap: 18px;
  align-content: start;
}

/* ===== 卡片 ===== */
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 16px 18px;
}
.card h2 { font-size: 16px; margin-bottom: 12px; }
.card h3 { font-size: 14px; margin-bottom: 10px; }
.sub { color: var(--muted); font-size: 12px; }

/* 统计卡 */
.grid-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
}
.stat {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 16px;
}
.stat .num { font-size: 26px; font-weight: 700; color: var(--primary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.stat .lbl { color: var(--muted); font-size: 12px; margin-top: 4px; }
.stat .num.danger { color: var(--danger); }
.stat .num.ok { color: var(--ok); }

/* 双栏 */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; align-items: start; }

/* ===== 表格 ===== */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 8px 10px; border-bottom: 1px solid var(--line); text-align: left; font-size: 13px; }
th { background: #f0f4fa; color: #47536a; font-weight: 600; white-space: nowrap; }
tr:hover td { background: #f8fafd; }
.muted { color: var(--muted); }
.score-neg { color: var(--danger); font-weight: 600; }
.score-ok { color: var(--ok); font-weight: 600; }
.nowrap { white-space: nowrap; }

/* 徽标 */
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 12px;
}
.badge-att { background: #e8f0fe; color: var(--primary); }
.badge-vio { background: #fdebec; color: #b3373b; }
.badge-me  { background: #fff3cd; color: #8a6d00; }
.badge-rw  { background: #e6f6ec; color: #1a7f37; }
.score-plus { color: var(--ok); font-weight: 600; }
.row-me { background: #fffbe8; }
.row-me td { font-weight: 600; }

/* ===== 表单 ===== */
.form-stack { display: grid; gap: 14px; }
.filters {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
  align-items: end;
}
label { display: grid; gap: 6px; font-size: 12px; color: #47536a; }
input[type=text], input[type=password], input[type=date], input[type=number],
select, textarea {
  padding: 8px 10px;
  border: 1px solid #cfd8e3;
  border-radius: 6px;
  font-size: 14px;
  background: #fff;
  width: 100%;
  color: var(--text);
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--primary);
}
textarea { min-height: 90px; resize: vertical; }

.btn {
  display: inline-block;
  padding: 8px 16px;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  font-size: 14px;
  background: var(--primary);
  color: #fff;
  text-decoration: none;
}
.btn:hover { background: var(--primary-dark); text-decoration: none; }
.btn-danger { background: var(--danger); }
.btn-danger:hover { background: #c9383d; }
.btn-ghost { background: #fff; color: var(--primary); border: 1px solid var(--primary); }
.btn-ghost:hover { background: #f0f6ff; }
.btn-sm { padding: 4px 10px; font-size: 12px; }

.flash { padding: 10px 14px; border-radius: 6px; margin-bottom: 14px; font-size: 13px; }
.flash-ok { background: #e6f6ea; color: #1c7a3b; border: 1px solid #b9e6c4; }
.flash-err { background: #fdebec; color: #b3373b; border: 1px solid #f3c1c3; }

.mt { margin-top: 12px; }
.mb { margin-bottom: 12px; }
.batchbar {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  align-items: center;
  margin-bottom: 10px;
  padding: 10px 12px;
  background: #f8fafd;
  border: 1px dashed var(--line);
  border-radius: 8px;
}
.form-actions { display: grid; grid-template-columns: auto auto; gap: 10px; justify-content: start; }
.form-inline { display: inline; }
.form-inline .btn { margin-left: 4px; }

/* ===== 登录页 ===== */
.login-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, #16233b, #1d6ff2);
}
.login-card {
  width: 360px;
  background: #fff;
  border-radius: 12px;
  padding: 26px;
  display: grid;
  gap: 16px;
}
.login-title { font-size: 18px; text-align: center; }
.login-tabs { display: grid; grid-template-columns: 1fr 1fr; gap: 4px; }
.tab-btn {
  padding: 10px;
  text-align: center;
  border: 1px solid var(--line);
  background: #f4f6f9;
  color: var(--muted);
  border-radius: 6px;
  font-size: 14px;
}
.tab-btn:hover { text-decoration: none; color: var(--primary); }
.tab-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ===== 周记卡片 ===== */
.diary-item {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 14px;
  display: grid;
  gap: 8px;
}
.diary-item .content { white-space: pre-wrap; }
.comment-box { background: #f6f9fd; border-left: 3px solid var(--ok); border-radius: 6px; padding: 10px 12px; }
.comment-box .t { color: var(--muted); font-size: 12px; }
.no-diary { color: var(--muted); font-style: italic; }

/* ===== 考试成绩网格表 ===== */
.score-grid td, .score-grid th { text-align: center; }
.score-grid input { width: 72px; text-align: center; padding: 6px; }

/* 大分数展示 */
.score-box { font-size: 36px; font-weight: 700; color: var(--primary); }
.score-box.danger { color: var(--danger); }
.score-box.ok { color: var(--ok); }

/* 响应式 */
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  .sidebar { grid-template-rows: auto auto auto; position: static; height: auto; }
}