/* ============================================================
   WUTA 全站共用样式
   配色：飞书蓝系（主色 #3370FF 家族）+ 队标金色点缀
   改配色只需要改 :root 里的变量，整站生效
   ============================================================ */
:root {
  --primary: #3370FF;        /* 飞书主蓝 */
  --primary-deep: #2456D9;   /* 深一档，按钮悬停 */
  --primary-light: #8FB3FF;  /* 浅一档，辅助 */
  --navy: #BFE0FF;           /* 天蓝：导航栏 / 浅色区块 */
  --navy-2: #D9ECFF;         /* */
  --ink: #1A2B4C;            /* 正文标题色 */
  --muted: #5B6B8C;          /* 次要文字 */
  --bg: #F4F7FE;             /* 页面底色 */
  --card: #FFFFFF;           /* 卡片 */
  --line: #E3EAF8;           /* 分隔线 */
  --gold: #D9B36A;           /* 队标金，点缀用 */
  --radius: 14px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
}

img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

.container { max-width: 1080px; margin: 0 auto; padding: 0 20px; }

/* ---------- 导航栏（深海军蓝，logo 白色部分在此最清晰） ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: var(--navy);
  box-shadow: 0 2px 12px rgba(11, 31, 78, .25);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.nav .logo {
  display: flex; align-items: center; gap: 10px;
  color: #12306E; font-weight: 700; font-size: 20px; letter-spacing: 1px;
}
.nav .logo img { height: 42px; width: auto; }
.nav .menu { display: flex; gap: 4px; }
.nav .menu a {
  color: rgba(18, 48, 110, .85);
  padding: 8px 14px; border-radius: 8px; font-size: 15px;
  transition: background .2s, color .2s;
}
.nav .menu a:hover { color: #12306E; background: var(--navy-2); }
.nav .menu a.active { color: #fff; background: var(--primary); }

/* 手机端汉堡按钮 */
.nav-toggle {
  display: none; background: none; border: 0; cursor: pointer;
  width: 40px; height: 40px;
}
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
  content: ""; display: block; width: 22px; height: 2px;
  background: #12306E; border-radius: 2px; margin: 0 auto;
  position: relative; transition: transform .2s;
}
.nav-toggle span::before { position: absolute; top: -7px; }
.nav-toggle span::after  { position: absolute; top: 7px; }

/* ---------- 深色首屏 ---------- */
.hero {
  background: var(--navy);
  color: #12306E;
  padding: 72px 0 80px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero::after { /* 金色细线点缀，呼应队标 */
  content: ""; position: absolute; left: 0; right: 0; bottom: 0;
  height: 4px; background: var(--gold);
}
.hero .hero-logo { width: min(420px, 78%); margin: 0 auto 28px; }
.hero h1 { font-size: clamp(26px, 4.5vw, 42px); letter-spacing: 2px; }
.hero .slogan {
  margin-top: 14px; font-size: clamp(15px, 2.2vw, 19px);
  color: var(--primary-deep); letter-spacing: 4px;
}
.hero .sub {
  margin-top: 16px; color: rgba(18, 48, 110, .72);
  max-width: 640px; margin-left: auto; margin-right: auto; font-size: 15px;
}
.hero .actions { margin-top: 32px; display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block; padding: 12px 30px; border-radius: 999px;
  font-size: 15px; font-weight: 600; transition: transform .15s, background .2s;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-deep); }
.btn-ghost { border: 1.5px solid rgba(18,48,110,.55); color: #12306E; }
.btn-ghost:hover { border-color: #12306E; background: rgba(18,48,110,.08); }
.btn-outline { border: 1.5px solid var(--primary); color: var(--primary); }
.btn-outline:hover { background: var(--primary); color: #fff; }

/* ---------- 通用区块 ---------- */
.section { padding: 64px 0; }
.section.alt { background: var(--card); }
.section-head { text-align: center; margin-bottom: 40px; }
.section-head .kicker {
  color: var(--primary); font-size: 13px; font-weight: 700; letter-spacing: 3px;
}
.section-head h2 { font-size: clamp(22px, 3vw, 30px); margin-top: 6px; }
.section-head p { color: var(--muted); margin-top: 10px; font-size: 15px; }

/* ---------- 卡片网格 ---------- */
.grid { display: grid; gap: 20px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.card {
  background: var(--card); border-radius: var(--radius);
  border: 1px solid var(--line); padding: 26px;
  transition: transform .15s, box-shadow .15s;
}
.card:hover { transform: translateY(-3px); box-shadow: 0 10px 26px rgba(36, 86, 217, .10); }
.card h3 { font-size: 18px; margin-bottom: 8px; }
.card p { color: var(--muted); font-size: 14.5px; }
.card .tag {
  display: inline-block; font-size: 12px; color: var(--primary);
  background: rgba(51, 112, 255, .10); border-radius: 999px;
  padding: 3px 12px; margin-bottom: 12px; font-weight: 600;
}

/* 深色卡片（用于深色区块内） */
.card-dark {
  background: var(--navy-2); border: 1px solid rgba(18,48,110,.12);
  border-radius: var(--radius); padding: 26px; color: #12306E;
}
.card-dark h3 { color: #12306E; }
.card-dark p { color: rgba(18,48,110,.72); }

/* ---------- 数据条 ---------- */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.stat {
  background: rgba(255,255,255,.55); border: 1px solid rgba(18,48,110,.14);
  border-radius: var(--radius); padding: 22px 12px; text-align: center;
}
.stat .num { font-size: 30px; font-weight: 700; color: #12306E; }
.stat .num em { font-style: normal; color: var(--gold); }
.stat .label { color: rgba(18,48,110,.65); font-size: 13px; margin-top: 4px; }

/* ---------- 列表条目（动态/日记/活动） ---------- */
.entry {
  display: flex; gap: 18px; align-items: flex-start;
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 22px 24px;
  transition: transform .15s, box-shadow .15s;
}
.entry:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(36,86,217,.08); }
.entry .date {
  flex: 0 0 auto; text-align: center; background: rgba(51,112,255,.08);
  border-radius: 10px; padding: 8px 12px; min-width: 72px;
}
.entry .date .d1 { font-size: 20px; font-weight: 700; color: var(--primary); line-height: 1.2; }
.entry .date .d2 { font-size: 12px; color: var(--muted); }
.entry h3 { font-size: 17px; margin-bottom: 6px; }
.entry p { color: var(--muted); font-size: 14.5px; }
.entry-list { display: grid; gap: 14px; }

/* ---------- 部门卡片编号 ---------- */
.dept-no {
  font-size: 13px; font-weight: 700; color: var(--gold); letter-spacing: 2px;
  margin-bottom: 8px;
}

/* ---------- 表格（赛车参数等） ---------- */
.table-wrap { overflow-x: auto; }
table.spec { width: 100%; border-collapse: collapse; background: var(--card); border-radius: var(--radius); overflow: hidden; }
table.spec th, table.spec td { padding: 13px 18px; text-align: left; font-size: 14.5px; border-bottom: 1px solid var(--line); }
table.spec th { background: rgba(51,112,255,.08); color: var(--primary); font-weight: 600; white-space: nowrap; }
table.spec td { color: var(--ink); }
table.spec td.dim { color: var(--muted); }

/* ---------- 步骤 ---------- */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; counter-reset: step; }
.step { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px 20px; position: relative; }
.step::before {
  counter-increment: step; content: counter(step);
  width: 34px; height: 34px; border-radius: 50%;
  background: var(--primary); color: #fff; font-weight: 700;
  display: flex; align-items: center; justify-content: center; margin-bottom: 14px;
}
.step h3 { font-size: 16px; margin-bottom: 6px; }
.step p { color: var(--muted); font-size: 14px; }

/* ---------- 联系卡片 ---------- */
.contact-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.contact-item { display: flex; gap: 16px; align-items: flex-start; }
.contact-item .ico {
  flex: 0 0 46px; width: 46px; height: 46px; border-radius: 12px;
  background: rgba(51,112,255,.10); color: var(--primary);
  display: flex; align-items: center; justify-content: center; font-size: 20px; font-weight: 700;
}

/* ---------- 表单 ---------- */
.form { display: grid; gap: 16px; }
.form label { font-size: 14px; font-weight: 600; }
.form input, .form textarea {
  width: 100%; padding: 12px 14px; border: 1.5px solid var(--line);
  border-radius: 10px; font-size: 15px; font-family: inherit; background: #fff;
}
.form input:focus, .form textarea:focus { outline: none; border-color: var(--primary); }
.form .hint { color: var(--muted); font-size: 13px; }

/* ---------- 占位提示条 ---------- */
.placeholder-tip {
  background: rgba(217, 179, 106, .12); border: 1px dashed var(--gold);
  border-radius: 10px; padding: 10px 16px; font-size: 13.5px; color: #8A6D2F;
  margin-top: 18px;
}

/* ---------- 页脚 ---------- */
.site-footer { background: var(--navy); color: rgba(18,48,110,.65); padding: 40px 0 28px; margin-top: 0; }
.site-footer .foot { display: flex; justify-content: space-between; align-items: center; gap: 20px; flex-wrap: wrap; }
.site-footer .foot .logo { color: #12306E; font-weight: 700; letter-spacing: 1px; }
.site-footer a { color: rgba(18,48,110,.75); }
.site-footer a:hover { color: #12306E; }
.site-footer .fine { margin-top: 18px; padding-top: 18px; border-top: 1px solid rgba(18,48,110,.10); font-size: 13px; text-align: center; }

/* ---------- 面包屑/页头小横幅（内页顶部） ---------- */
.page-hero {
  background: var(--navy); color: #12306E; padding: 46px 0 40px; position: relative;
}
.page-hero::after { content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 3px; background: var(--gold); }
.page-hero h1 { font-size: clamp(24px, 3.4vw, 34px); }
.page-hero p { color: rgba(18,48,110,.7); margin-top: 8px; font-size: 15px; }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .grid-3, .steps { grid-template-columns: repeat(2, 1fr); }
  .stats { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .grid-3, .grid-2, .steps, .contact-grid { grid-template-columns: 1fr; }
  .nav-toggle { display: block; }
  .nav .menu {
    display: none; position: absolute; top: 64px; left: 0; right: 0;
    background: var(--navy); flex-direction: column; padding: 10px 16px 16px;
    box-shadow: 0 12px 20px rgba(11,31,78,.3);
  }
  .nav .menu.open { display: flex; }
  .hero { padding: 48px 0 56px; }
  .section { padding: 44px 0; }
  .entry { flex-direction: column; gap: 10px; }
}