/* ============ 25物联2班 · 学业成绩查询系统 · 蓝白学术风 ============ */
:root {
  --navy:   #1B3A6B;  /* 主色 藏青 */
  --blue:   #2E5FA3;  /* 次级蓝 */
  --sky:    #4A90D9;  /* 点缀 天蓝 */
  --bg:     #F4F7FB;  /* 页面背景 */
  --tint:   #E8F1FC;  /* 浅蓝底纹 */
  --card:   #FFFFFF;  /* 卡片白 */
  --text:   #1F2A44;  /* 正文深蓝灰 */
  --muted:  #64748B;  /* 辅助文字 */
  --line:   #E3EAF5;  /* 分割线 */
  --gold:   #B98A2F;  /* 学术金点缀 */
  --danger: #B03A3A;
}

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

body {
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.6;
}

/* ---------- 头部 ---------- */
.site-header {
  background: linear-gradient(135deg, var(--navy) 0%, var(--blue) 100%);
  color: #fff;
  padding: 28px 20px;
  box-shadow: 0 2px 12px rgba(27, 58, 107, .25);
}
.header-inner {
  max-width: 860px; margin: 0 auto;
  display: flex; align-items: center; gap: 18px;
}
.emblem {
  width: 58px; height: 58px; flex: none;
  border: 2px solid rgba(255,255,255,.7);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-family: Georgia, "SimSun", serif;
  font-size: 22px; font-weight: 700; letter-spacing: 1px;
  background: rgba(255,255,255,.08);
}
.site-header h1 {
  font-family: Georgia, "STZhongsong", "SimSun", serif;
  font-size: 24px; font-weight: 700; letter-spacing: 2px;
}
.site-header .sub { font-size: 13px; opacity: .85; margin-top: 2px; }

/* ---------- 主体 ---------- */
.container { max-width: 860px; width: 100%; margin: 0 auto; padding: 26px 20px 40px; flex: 1; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 28px;
  box-shadow: 0 2px 12px rgba(27, 58, 107, .07);
  margin-top: 20px;
}

/* 说明区 */
.notice {
  background: var(--tint);
  border: 1px solid #BBD4F0;
  border-left: 4px solid var(--sky);
  border-radius: 10px;
  padding: 16px 20px;
  font-size: 14px;
  color: var(--text);
}
.notice h2 { font-size: 15px; color: var(--navy); margin-bottom: 6px; }

/* ---------- 登录 ---------- */
.card-title {
  font-family: Georgia, "STZhongsong", "SimSun", serif;
  color: var(--navy); font-size: 20px; letter-spacing: 1px;
}
.login-tip { font-size: 13px; color: var(--muted); margin: 6px 0 18px; }
.login-card { max-width: 460px; margin-left: auto; margin-right: auto; }

.field { margin-bottom: 16px; }
.field label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 6px; color: var(--text); }
.field input {
  width: 100%; padding: 11px 14px;
  border: 1px solid var(--line); border-radius: 8px;
  font-size: 15px; color: var(--text); background: var(--bg);
  outline: none; transition: border-color .15s, box-shadow .15s;
}
.field input:focus { border-color: var(--sky); box-shadow: 0 0 0 3px rgba(74, 144, 217, .18); background: #fff; }

.btn-primary {
  width: 100%; padding: 12px;
  background: var(--navy); color: #fff;
  border: none; border-radius: 8px;
  font-size: 16px; letter-spacing: 6px; cursor: pointer;
  transition: background .15s;
}
.btn-primary:hover { background: var(--blue); }
.btn-primary:disabled { background: #9DB3D4; cursor: wait; }

.error {
  color: var(--danger); font-size: 13.5px;
  background: #FBEBEB; border: 1px solid #EFC9C9;
  border-radius: 8px; padding: 8px 12px; margin-bottom: 14px;
}

/* ---------- 结果 ---------- */
.result-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; flex-wrap: wrap; }
.btn-ghost {
  background: none; border: 1px solid var(--line); color: var(--muted);
  padding: 7px 16px; border-radius: 8px; font-size: 13px; cursor: pointer;
  transition: border-color .15s, color .15s;
}
.btn-ghost:hover { border-color: var(--sky); color: var(--blue); }

.rank-banner {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px;
  margin: 22px 0 14px;
}
.rank-item {
  background: linear-gradient(160deg, var(--navy), var(--blue));
  border-radius: 12px; color: #fff;
  padding: 18px 10px; text-align: center;
}
.rank-label { display: block; font-size: 13px; opacity: .85; }
.rank-value { font-size: 34px; font-weight: 700; font-family: Georgia, serif; }

.stat-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-bottom: 22px; }
.stat {
  background: var(--tint); border-radius: 10px;
  padding: 12px; text-align: center;
}
.stat span { display: block; font-size: 12.5px; color: var(--muted); }
.stat b { font-size: 19px; color: var(--navy); font-family: Georgia, serif; }

.table-title {
  font-size: 15px; color: var(--navy);
  border-left: 4px solid var(--gold); padding-left: 10px;
  margin-bottom: 10px;
}
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 10px; }
table { width: 100%; border-collapse: collapse; font-size: 14px; min-width: 480px; }
thead th {
  background: var(--navy); color: #fff;
  padding: 10px 14px; text-align: left; font-weight: 500; white-space: nowrap;
}
thead th:first-child { min-width: 260px; }
tbody td { padding: 9px 14px; border-bottom: 1px solid var(--line); }
tbody tr:last-child td { border-bottom: none; }
tbody tr:nth-child(even) { background: var(--bg); }
td.grade { font-weight: 700; color: var(--blue); white-space: nowrap; }
td.grade.free { color: #A6B3C7; font-weight: 400; }

.footnote { font-size: 12.5px; color: var(--muted); margin-top: 10px; }

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--navy); color: rgba(255,255,255,.85);
  text-align: center; padding: 22px 20px 26px; font-size: 12.5px; line-height: 2;
}
.site-footer .muted { opacity: .6; }

/* ---------- 手机适配 ---------- */
@media (max-width: 640px) {
  .site-header { padding: 20px 16px; }
  .site-header h1 { font-size: 18px; letter-spacing: 1px; }
  .emblem { width: 46px; height: 46px; font-size: 18px; }
  .container { padding: 18px 14px 32px; }
  .card { padding: 20px 16px; }
  .rank-banner, .stat-row { grid-template-columns: repeat(3, 1fr); gap: 8px; }
  .rank-value { font-size: 24px; }
  .stat b { font-size: 16px; }
  .rank-item { padding: 14px 4px; border-radius: 10px; }
  .rank-label, .stat span { font-size: 11.5px; }
  .btn-primary { letter-spacing: 4px; }
  /* 小屏隐藏学时列，成绩无需横滑即可见 */
  table { min-width: 0; }
  thead th:first-child { min-width: 0; }
  thead th:nth-child(2), tbody td:nth-child(2) { display: none; }
  .table-wrap { overflow-x: visible; }
}