:root {
  --bg: #f6f8fb;
  --surface: #ffffff;
  --text: #1b2230;
  --muted: #6b7787;
  --border: #e4e9f0;
  --brand: #2f6df6;
  --brand-dark: #1f52c4;
  --brand-soft: #eaf1ff;
  --accent: #17b890;
  --radius: 14px;
  --shadow: 0 6px 24px rgba(23, 43, 77, .07);
  --shadow-hover: 0 12px 32px rgba(23, 43, 77, .13);
  --maxw: 1120px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--brand); text-decoration: none; }
a:hover { color: var(--brand-dark); }

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

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, .88);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.site-header .inner {
  max-width: var(--maxw); margin: 0 auto; padding: 0 20px;
  height: 62px; display: flex; align-items: center; gap: 28px;
}
.logo { display: flex; align-items: center; gap: 9px; font-weight: 800; font-size: 18px; color: var(--text); letter-spacing: .2px; }
.logo .mark {
  width: 30px; height: 30px; border-radius: 9px; display: grid; place-items: center;
  background: linear-gradient(135deg, var(--brand), var(--accent)); color: #fff; font-size: 16px;
}
.nav { display: flex; gap: 4px; margin-left: auto; flex-wrap: wrap; }
.nav a {
  padding: 7px 14px; border-radius: 999px; color: var(--muted); font-size: 15px; font-weight: 500;
}
.nav a:hover { background: var(--brand-soft); color: var(--brand-dark); }
.nav a.active { color: var(--brand-dark); background: var(--brand-soft); }

/* ---------- Hero ---------- */
.hero {
  background:
    radial-gradient(900px 380px at 12% -10%, #dbe8ff 0%, transparent 60%),
    radial-gradient(760px 320px at 92% 0%, #d9f7ef 0%, transparent 55%),
    var(--surface);
  border-bottom: 1px solid var(--border);
}
.hero .inner { max-width: var(--maxw); margin: 0 auto; padding: 72px 20px 60px; text-align: center; }
.hero h1 { font-size: clamp(28px, 4.4vw, 44px); line-height: 1.25; margin: 0 0 14px; letter-spacing: -.5px; }
.hero h1 .hl { color: var(--brand); }
.hero p.lead { font-size: 17px; color: var(--muted); max-width: 620px; margin: 0 auto 30px; }

.search-box {
  display: flex; gap: 8px; max-width: 620px; margin: 0 auto;
  background: var(--surface); border: 1px solid var(--border); border-radius: 999px;
  padding: 7px 7px 7px 20px; box-shadow: var(--shadow);
}
.search-box input {
  flex: 1; border: 0; outline: 0; font-size: 16px; background: transparent; color: var(--text); min-width: 0;
}
.search-box button {
  border: 0; cursor: pointer; background: var(--brand); color: #fff; font-size: 15px; font-weight: 600;
  padding: 10px 22px; border-radius: 999px; transition: background .15s;
}
.search-box button:hover { background: var(--brand-dark); }

.quick-stats { display: flex; gap: 30px; justify-content: center; margin-top: 28px; flex-wrap: wrap; }
.quick-stats .stat b { display: block; font-size: 24px; color: var(--brand); }
.quick-stats .stat span { font-size: 13px; color: var(--muted); }

/* ---------- Sections ---------- */
.section { padding: 46px 0; }
.section-head { display: flex; align-items: baseline; gap: 14px; margin-bottom: 22px; }
.section-head h2 { font-size: 22px; margin: 0; }
.section-head .more { margin-left: auto; font-size: 14px; }
.section-head p { margin: 0; color: var(--muted); font-size: 14px; }

/* ---------- Cards ---------- */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; }

.job-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px 18px 16px; display: flex; flex-direction: column; gap: 10px;
  transition: transform .15s, box-shadow .15s, border-color .15s;
}
.job-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); border-color: #cdd9ef; }
.job-card .top { display: flex; justify-content: space-between; gap: 10px; align-items: flex-start; }
.job-card h3 { margin: 0; font-size: 17px; }
.job-card h3 a { color: var(--text); }
.job-card h3 a:hover { color: var(--brand); }
.job-card .company { color: var(--muted); font-size: 14px; }
.job-card .salary { color: #e8590c; font-weight: 700; white-space: nowrap; font-size: 15px; }
.job-card .meta { display: flex; flex-wrap: wrap; gap: 7px; font-size: 13px; color: var(--muted); }
.job-card .desc { color: var(--muted); font-size: 14px; margin: 0; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.job-card .foot { display: flex; align-items: center; gap: 10px; margin-top: auto; padding-top: 6px; }

.tag {
  display: inline-block; background: var(--brand-soft); color: var(--brand-dark);
  padding: 2px 10px; border-radius: 999px; font-size: 12.5px; font-weight: 500;
}
.tag.gray { background: #eef1f5; color: #58627a; }
.tag.green { background: #e2f8f1; color: #0d8a6b; }

.pill { font-size: 12px; padding: 2px 9px; border-radius: 6px; background: #eef1f5; color: #58627a; }
.pill.intern { background: #fff1e6; color: #c05621; }
.pill.full { background: #e7f5ff; color: #1864ab; }
.pill.campus { background: #f1e9ff; color: #6741d9; }

/* ---------- Filters ---------- */
.toolbar {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 14px 16px; margin-bottom: 22px; display: flex; flex-wrap: wrap; gap: 10px; align-items: center;
}
.toolbar input[type="search"], .toolbar select {
  border: 1px solid var(--border); border-radius: 9px; padding: 9px 12px; font-size: 14px;
  background: #fff; color: var(--text); outline: none; font-family: inherit;
}
.toolbar input[type="search"] { flex: 1; min-width: 180px; }
.toolbar input:focus, .toolbar select:focus { border-color: var(--brand); box-shadow: 0 0 0 3px var(--brand-soft); }
.toolbar .count { color: var(--muted); font-size: 14px; margin-left: auto; }
.btn-reset { border: 1px solid var(--border); background: #fff; border-radius: 9px; padding: 9px 14px; cursor: pointer; font-size: 14px; color: var(--muted); font-family: inherit; }
.btn-reset:hover { border-color: var(--brand); color: var(--brand); }

/* ---------- Resources ---------- */
.resource-group { margin-bottom: 34px; }
.resource-group h3 { display: flex; align-items: center; gap: 9px; font-size: 18px; margin: 0 0 14px; }
.resource-group h3 .ico { font-size: 20px; }
.link-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 14px; }
.link-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px; transition: transform .15s, box-shadow .15s, border-color .15s; display: block;
}
.link-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); border-color: #cdd9ef; }
.link-card .name { font-weight: 600; color: var(--text); display: flex; align-items: center; gap: 8px; }
.link-card .name::after { content: "↗"; color: var(--muted); font-size: 13px; }
.link-card .desc { color: var(--muted); font-size: 13.5px; margin: 6px 0 0; }

/* ---------- Prose ---------- */
.prose { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 30px 34px; box-shadow: var(--shadow); }
.prose h2 { margin-top: 0; }
.prose h3 { margin-top: 26px; }
.prose ul { padding-left: 20px; }
.prose li { margin: 6px 0; }

.empty { text-align: center; color: var(--muted); padding: 46px 0; }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--border); background: var(--surface); margin-top: 30px; }
.site-footer .inner { max-width: var(--maxw); margin: 0 auto; padding: 26px 20px; color: var(--muted); font-size: 14px; display: flex; flex-wrap: wrap; gap: 10px; }
.site-footer .inner span:last-child { margin-left: auto; }

/* ---------- Skeleton ---------- */
.skeleton { background: linear-gradient(90deg, #eef1f6 25%, #e2e7ef 37%, #eef1f6 63%); background-size: 400% 100%; animation: sk 1.3s ease infinite; border-radius: 8px; }
@keyframes sk { 0% { background-position: 100% 50%; } 100% { background-position: 0 50%; } }

@media (max-width: 640px) {
  .hero .inner { padding: 52px 20px 44px; }
  .site-header .inner { gap: 10px; }
  .nav a { padding: 7px 10px; font-size: 14px; }
  .quick-stats { gap: 18px; }
  .prose { padding: 22px 20px; }
}