/* ============================================================
   DX1267班 网站 · 样式
   一般不需要改这个文件。想换主题色，改下面 :root 里的颜色即可。
   ============================================================ */

:root {
  --navy:  #0F2E55;
  --blue:  #1E5FA8;
  --cyan:  #2AA8C4;
  --gold:  #E0A93B;
  --bg:    #F4F7FB;
  --card:  #FFFFFF;
  --text:  #1F2937;
  --muted: #6B7280;
  --line:  #E3E9F2;
  --radius: 14px;
  --shadow: 0 2px 10px rgba(16, 49, 92, .06);
  --shadow-hover: 0 8px 24px rgba(16, 49, 92, .12);
  --maxw: 1120px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
               "Hiragino Sans GB", "Source Han Sans SC", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* ---------------- 顶部导航 ---------------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.92);
  backdrop-filter: saturate(160%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.site-header .inner {
  max-width: var(--maxw); margin: 0 auto; padding: 0 20px;
  height: 62px; display: flex; align-items: center; gap: 16px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; }
.brand .logo {
  width: 34px; height: 34px; border-radius: 9px;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  color: #fff; display: grid; place-items: center;
  font-size: 13px; letter-spacing: .5px;
}
.brand .name { font-size: 16px; color: var(--navy); white-space: nowrap; }

.nav { margin-left: auto; display: flex; align-items: center; gap: 2px; }
.nav a {
  padding: 8px 13px; border-radius: 9px; font-size: 14.5px;
  color: var(--muted); transition: .18s;
}
.nav a:hover { color: var(--blue); background: #EEF4FC; }
.nav a.active { color: var(--blue); background: #E7F0FC; font-weight: 700; }

.nav-toggle {
  display: none; margin-left: auto;
  width: 40px; height: 40px; border: 1px solid var(--line);
  background: #fff; border-radius: 10px; cursor: pointer;
  align-items: center; justify-content: center; flex-direction: column; gap: 4px;
}
.nav-toggle span {
  display: block; width: 18px; height: 2px; background: var(--navy); border-radius: 2px;
  transition: .2s;
}

/* ---------------- 首页大图区 ---------------- */
.hero {
  background: linear-gradient(135deg, var(--navy) 0%, var(--blue) 62%, #2E7BB8 100%);
  color: #fff; position: relative; overflow: hidden;
}
.hero::after {
  content: ""; position: absolute; right: -120px; top: -120px;
  width: 460px; height: 460px; border-radius: 50%;
  border: 1px solid rgba(255,255,255,.18);
}
.hero .inner {
  max-width: var(--maxw); margin: 0 auto; padding: 54px 20px 58px;
  position: relative; z-index: 1;
}
.hero .kicker {
  display: inline-block; font-size: 12.5px; letter-spacing: 1px;
  padding: 5px 12px; border-radius: 99px;
  background: rgba(255,255,255,.16); border: 1px solid rgba(255,255,255,.24);
}
.hero h1 { font-size: 40px; line-height: 1.25; margin: 16px 0 10px; letter-spacing: .5px; }
.hero p  { font-size: 16px; color: rgba(255,255,255,.82); }

/* ---------------- 通用区块 ---------------- */
.section { padding: 44px 0 8px; }
.section-head {
  display: flex; align-items: baseline; gap: 12px; margin-bottom: 18px;
}
.section-head h2 {
  font-size: 21px; color: var(--navy); letter-spacing: .5px;
  position: relative; padding-left: 13px;
}
.section-head h2::before {
  content: ""; position: absolute; left: 0; top: 6px; bottom: 6px;
  width: 4px; border-radius: 3px;
  background: linear-gradient(180deg, var(--blue), var(--cyan));
}
.section-head .more {
  margin-left: auto; font-size: 13.5px; color: var(--blue);
}
.section-head .more:hover { text-decoration: underline; }

/* ---------------- 卡片 ---------------- */
.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow);
  transition: .2s;
}
.card:hover { box-shadow: var(--shadow-hover); transform: translateY(-2px); }

.grid { display: grid; gap: 16px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* ---------------- 快捷入口 ---------------- */
.quick { padding: 20px; display: block; }
.quick .ico {
  width: 42px; height: 42px; border-radius: 11px; display: grid; place-items: center;
  font-size: 19px; margin-bottom: 12px;
  background: #EAF2FC;
}
.quick h3 { font-size: 16px; color: var(--navy); margin-bottom: 3px; }
.quick p  { font-size: 13px; color: var(--muted); }

/* ---------------- 通知列表 ---------------- */
.notice {
  display: flex; gap: 16px; padding: 17px 20px; align-items: flex-start;
}
.notice + .notice { border-top: 1px solid var(--line); }
.notice .date {
  flex: 0 0 84px; font-size: 13px; color: var(--muted);
  font-variant-numeric: tabular-nums; padding-top: 2px;
}
.notice .body { flex: 1; min-width: 0; }
.notice h3 { font-size: 15.5px; color: var(--navy); margin-bottom: 5px; }
.notice p  { font-size: 13.5px; color: var(--muted); }
.tag-top {
  display: inline-block; font-size: 11.5px; color: #fff; background: #D9534F;
  padding: 1px 7px; border-radius: 5px; margin-right: 7px; vertical-align: 1px;
}

/* ---------------- 资料 / 链接 卡片 ---------------- */
.item { padding: 18px 20px; display: block; }
.item .subject {
  display: inline-block; font-size: 11.5px; color: var(--blue);
  background: #EAF2FC; padding: 2px 9px; border-radius: 6px; margin-bottom: 9px;
}
.item h3 { font-size: 15.5px; color: var(--navy); margin-bottom: 4px; }
.item p  { font-size: 13px; color: var(--muted); }

/* ---------------- 相册 ---------------- */
.album { overflow: hidden; }
.album .cover {
  height: 150px; background: linear-gradient(135deg, #DCE7F5, #EEF4FC);
  display: grid; place-items: center; color: #9DB2CC; font-size: 13px;
  background-size: cover; background-position: center;
}
.album .meta { padding: 13px 16px; }
.album .meta h3 { font-size: 15px; color: var(--navy); }
.album .meta span { font-size: 12.5px; color: var(--muted); }

/* ---------------- 轮播 ---------------- */
.carousel { position: relative; border-radius: var(--radius); overflow: hidden; }
.slides { position: relative; height: 240px; }
.slide {
  position: absolute; inset: 0; opacity: 0; transition: opacity .5s;
  display: flex; flex-direction: column; justify-content: flex-end;
  padding: 26px 30px; color: #fff;
  background: linear-gradient(135deg, var(--navy), var(--blue));
}
.slide.on { opacity: 1; }
.slide:nth-child(2) { background: linear-gradient(135deg, #14425F, var(--cyan)); }
.slide:nth-child(3) { background: linear-gradient(135deg, #2C3E63, #4A6FA5); }
.slide h3 { font-size: 24px; margin-bottom: 6px; }
.slide p  { font-size: 14px; color: rgba(255,255,255,.85); }
.dots { position: absolute; right: 20px; bottom: 20px; display: flex; gap: 8px; }
.dots button {
  width: 9px; height: 9px; border-radius: 50%; border: 0; cursor: pointer;
  background: rgba(255,255,255,.45); padding: 0;
}
.dots button.on { background: #fff; width: 22px; border-radius: 5px; }

/* ---------------- 聊天室 ---------------- */
.chat-frame {
  width: 100%; height: 620px; border: 1px solid var(--line);
  border-radius: var(--radius); background: #fff;
}
.chat-empty {
  padding: 56px 24px; text-align: center; color: var(--muted);
}
.chat-empty strong { display: block; font-size: 17px; color: var(--navy); margin-bottom: 8px; }

/* ---------------- 页脚 ---------------- */
.site-footer {
  margin-top: 56px; background: var(--navy); color: rgba(255,255,255,.72);
  font-size: 13px;
}
.site-footer .inner {
  max-width: var(--maxw); margin: 0 auto; padding: 26px 20px;
  display: flex; flex-wrap: wrap; gap: 10px; justify-content: space-between;
}

/* ---------------- 响应式 ---------------- */
@media (max-width: 900px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .hero h1 { font-size: 30px; }
}
@media (max-width: 700px) {
  .nav { display: none; }
  .nav.open {
    display: flex; flex-direction: column; align-items: stretch;
    position: absolute; top: 62px; left: 0; right: 0;
    background: #fff; border-bottom: 1px solid var(--line);
    padding: 8px 12px 14px; gap: 2px;
    box-shadow: 0 12px 24px rgba(16,49,92,.10);
  }
  .nav.open a { padding: 11px 14px; font-size: 15px; }
  .nav-toggle { display: flex; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .hero h1 { font-size: 25px; }
  .hero .inner { padding: 38px 20px 42px; }
  .slides { height: 210px; }
  .slide h3 { font-size: 19px; }
  .notice { flex-direction: column; gap: 6px; }
  .notice .date { flex: none; }
  .section { padding: 32px 0 6px; }
}