:root {
  --navy: #0d1b2a;
  --navy-2: #1b263b;
  --accent: #2f6fed;
  --accent-dark: #1e4fbf;
  --text: #22303f;
  --muted: #5f6f81;
  --line: #e3e8ef;
  --bg-soft: #f5f7fa;
  --radius: 12px;
}

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

body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  line-height: 1.7;
  background: #fff;
}

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

.container { max-width: 1100px; margin: 0 auto; padding: 0 24px; }

/* ---------- Header ---------- */
.site-header {
  background: var(--navy);
  color: #fff;
  position: sticky;
  top: 0;
  z-index: 50;
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand { font-size: 1.25rem; font-weight: 700; letter-spacing: .02em; }
.brand span { color: var(--accent); }
.nav { display: flex; gap: 28px; font-size: .95rem; }
.nav a { color: #cdd6e0; padding: 4px 0; border-bottom: 2px solid transparent; }
.nav a:hover { color: #fff; }
.nav a.active { color: #fff; border-bottom-color: var(--accent); }

/* ---------- Hero ---------- */
.hero { position: relative; color: #fff; }
.hero img { width: 100%; height: 480px; object-fit: cover; }
.hero .overlay {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(13,27,42,.55), rgba(13,27,42,.75));
  display: flex; align-items: center;
}
.hero h1 { font-size: 2.2rem; line-height: 1.4; max-width: 720px; }
.hero p.sub { margin-top: 16px; font-size: 1.05rem; color: #dbe4ee; max-width: 640px; }

.page-hero {
  background: var(--navy);
  color: #fff;
  padding: 64px 0 56px;
}
.page-hero h1 { font-size: 2rem; }
.page-hero p { margin-top: 10px; color: #b9c6d4; max-width: 720px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 12px 28px;
  border-radius: 8px;
  font-weight: 600;
  border: none;
  font-size: 1rem;
  cursor: pointer;
}
.btn:hover { background: var(--accent-dark); }
.btn.ghost { background: transparent; border: 1.5px solid #fff; }
.btn.ghost:hover { background: rgba(255,255,255,.12); }

/* ---------- Sections ---------- */
section { padding: 64px 0; }
section.alt { background: var(--bg-soft); }
.section-title { font-size: 1.6rem; margin-bottom: 8px; }
.section-sub { color: var(--muted); margin-bottom: 36px; }

/* ---------- Stats ---------- */
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; text-align: center; }
.stat .num { font-size: 2.4rem; font-weight: 700; color: var(--accent); }
.stat .label { color: var(--muted); font-size: .95rem; margin-top: 4px; }

/* ---------- Cards ---------- */
.grid { display: grid; gap: 28px; }
.grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid.cols-3 { grid-template-columns: repeat(3, 1fr); }

.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.card img { height: 200px; object-fit: cover; width: 100%; }
.card .body { padding: 20px 22px 24px; flex: 1; display: flex; flex-direction: column; }
.card h3 { font-size: 1.12rem; margin-bottom: 6px; line-height: 1.5; }
.card .meta { font-size: .85rem; color: var(--muted); margin-bottom: 10px; }
.card p { font-size: .95rem; color: var(--text); }
.card .tag {
  display: inline-block;
  font-size: .78rem;
  padding: 2px 10px;
  border-radius: 999px;
  background: #e8effc;
  color: var(--accent-dark);
  margin-bottom: 10px;
  align-self: flex-start;
}
.card .tag.closed { background: #eef1f5; color: var(--muted); }
.card .tag.open { background: #e4f7ec; color: #187a44; }

/* ---------- Program card extras ---------- */
.program-info { list-style: none; margin: 12px 0; font-size: .9rem; color: var(--muted); }
.program-info li { padding: 2px 0; }
.program-info b { color: var(--text); font-weight: 600; }
.price { font-size: 1.3rem; font-weight: 700; color: var(--navy); margin-top: auto; padding-top: 14px; }
.price small { font-weight: 400; color: var(--muted); font-size: .82rem; }

/* ---------- Faculty ---------- */
.person { text-align: left; }
.person .avatar {
  height: 120px;
  background: linear-gradient(135deg, var(--navy-2), var(--accent));
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 2rem; font-weight: 700;
}
.person .loc { color: var(--muted); font-size: .85rem; margin-bottom: 8px; }

/* ---------- Forms ---------- */
.form-wrap { max-width: 760px; margin: 0 auto; }
.notice {
  background: var(--bg-soft);
  border-left: 4px solid var(--accent);
  padding: 18px 22px;
  border-radius: 0 8px 8px 0;
  font-size: .92rem;
  color: var(--muted);
  margin-bottom: 36px;
}
form .row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
form label { display: block; margin-bottom: 18px; font-size: .92rem; font-weight: 600; }
form label span.req { color: #c0392b; }
form input, form select, form textarea {
  width: 100%;
  margin-top: 6px;
  padding: 11px 13px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: .95rem;
  font-family: inherit;
  background: #fff;
}
form input:focus, form select:focus, form textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(47,111,237,.15);
}
form textarea { min-height: 110px; resize: vertical; }
.form-status { margin-top: 16px; font-size: .95rem; }
.form-status.ok { color: #187a44; }
.form-status.err { color: #c0392b; }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--navy);
  color: #93a4b5;
  padding: 32px 0;
  font-size: .85rem;
  text-align: center;
}

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .grid.cols-2, .grid.cols-3 { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  form .row { grid-template-columns: 1fr; }
  .hero img { height: 400px; }
  .hero h1 { font-size: 1.6rem; }
  .nav { gap: 16px; font-size: .85rem; flex-wrap: wrap; }
  .site-header .container { flex-direction: column; height: auto; padding: 12px 24px; gap: 8px; }
}