/* 新生研讨课 · 静态网站样式 */
:root {
  --navy: #16324f;
  --navy-deep: #0e2438;
  --navy-soft: #2c5a8f;
  --accent: #e8a33d;
  --accent-deep: #c9821f;
  --bg: #f4f6f9;
  --card: #ffffff;
  --line: #e5e9f0;
  --text: #22303f;
  --muted: #66788c;
  --radius: 14px;
  --shadow: 0 1px 3px rgba(14, 36, 56, .06), 0 8px 24px rgba(14, 36, 56, .07);
  --shadow-lift: 0 4px 12px rgba(14, 36, 56, .08), 0 16px 40px rgba(14, 36, 56, .12);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--navy-soft); text-decoration: none; }
a:hover { color: var(--accent-deep); }

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

/* ---------- 顶部导航 ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, .93);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: 1080px; margin: 0 auto; padding: 12px 20px;
  display: flex; align-items: center; gap: 20px;
}
.brand { color: var(--navy); font-weight: 700; font-size: 1.12rem; line-height: 1.3; }
.brand small { display: block; font-size: .68rem; font-weight: 500; color: var(--muted); letter-spacing: .04em; }
.nav-links { margin-left: auto; display: flex; gap: 4px; flex-wrap: wrap; }
.nav-links a {
  padding: 7px 14px; border-radius: 999px; color: var(--muted); font-size: .95rem;
}
.nav-links a:hover { background: #eef2f7; color: var(--navy); }
.nav-links a.active { background: var(--navy); color: #fff; }

/* ---------- 首页 Hero ---------- */
.hero {
  background: linear-gradient(135deg, var(--navy-deep) 0%, var(--navy) 52%, var(--navy-soft) 100%);
  color: #fff; padding: 74px 20px 96px; position: relative; overflow: hidden;
}
.hero::before, .hero::after {
  content: ""; position: absolute; border-radius: 50%; pointer-events: none;
}
.hero::before {
  width: 460px; height: 460px; right: -140px; top: -160px;
  background: radial-gradient(circle, rgba(232, 163, 61, .16) 0%, transparent 65%);
}
.hero::after {
  width: 380px; height: 380px; left: -120px; bottom: -190px;
  background: radial-gradient(circle, rgba(255, 255, 255, .07) 0%, transparent 65%);
}
.hero-inner { max-width: 1080px; margin: 0 auto; position: relative; z-index: 1; }
.hero .kicker {
  display: inline-block; font-size: .85rem; letter-spacing: .12em;
  color: #f2d5a4; border: 1px solid rgba(242, 213, 164, .45);
  padding: 4px 14px; border-radius: 999px; margin-bottom: 18px;
}
.hero h1 { font-size: clamp(2.1rem, 5vw, 2.9rem); margin: 0 0 8px; letter-spacing: .03em; }
.hero .sub { color: #b9c9dc; font-size: 1.05rem; margin: 0; }
.hero .lead { max-width: 660px; color: #dce7f3; margin: 20px 0 0; font-size: 1.02rem; }
.hero .actions { margin-top: 30px; display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 11px 26px; border-radius: 10px;
  font-size: .98rem; font-weight: 600; transition: transform .12s ease, box-shadow .12s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--accent); color: #221302; }
.btn-primary:hover { color: #221302; box-shadow: 0 8px 20px rgba(232, 163, 61, .35); }
.btn-ghost { border: 1px solid rgba(255, 255, 255, .45); color: #fff; }
.btn-ghost:hover { color: #fff; border-color: #fff; background: rgba(255, 255, 255, .08); }

/* ---------- 下一讲卡片（压在 hero 下沿） ---------- */
.next-card {
  max-width: 1080px; margin: -58px auto 0; position: relative; z-index: 2;
  background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow-lift);
  padding: 22px 26px; display: flex; align-items: center; gap: 22px; flex-wrap: wrap;
}
.next-date {
  flex: none; text-align: center; background: var(--navy); color: #fff;
  border-radius: 12px; padding: 12px 18px; min-width: 118px;
}
.next-date .d { font-size: 1.5rem; font-weight: 700; line-height: 1.2; }
.next-date .w { font-size: .8rem; color: #a9bdd4; }
.next-info { flex: 1 1 260px; min-width: 240px; }
.next-pill {
  display: inline-block; font-size: .78rem; font-weight: 600; color: var(--accent-deep);
  background: rgba(232, 163, 61, .14); border-radius: 999px; padding: 2px 12px; margin-bottom: 6px;
}
.next-info h3 { margin: 0 0 4px; font-size: 1.18rem; color: var(--text); }
.next-info .meta { color: var(--muted); font-size: .92rem; }
.next-count { flex: none; text-align: right; }
.next-count .n { font-size: 1.7rem; font-weight: 700; color: var(--navy); line-height: 1.1; }
.next-count .l { font-size: .8rem; color: var(--muted); }

/* ---------- 通用区块 ---------- */
.section { padding: 46px 0 8px; }
.section-head { display: flex; align-items: baseline; gap: 14px; margin-bottom: 22px; }
.section-head h2 { margin: 0; font-size: 1.5rem; color: var(--navy); }
.section-head .hint { color: var(--muted); font-size: .92rem; }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 18px; }
.card {
  background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 22px 24px;
}
.card .ic { font-size: 1.35rem; }
.card h3 { margin: 8px 0 6px; font-size: 1.02rem; color: var(--navy); }
.card p { margin: 0; color: var(--muted); font-size: .93rem; }

/* 主题一览 chips */
.chips { display: flex; flex-wrap: wrap; gap: 10px; }
.chips a {
  padding: 7px 15px; border-radius: 999px; font-size: .88rem;
  background: #fff; color: var(--text); box-shadow: var(--shadow); border: 1px solid var(--line);
  transition: transform .12s ease;
}
.chips a:hover { transform: translateY(-2px); color: inherit; }
.chips a b { color: var(--navy); font-weight: 600; }

/* ---------- 页面标题 ---------- */
.page-head { padding: 46px 0 6px; }
.page-head h1 { margin: 0 0 8px; font-size: 1.8rem; color: var(--navy); }
.page-head p { margin: 0; color: var(--muted); }

/* ---------- 课程安排 ---------- */
.timeline { display: flex; flex-direction: column; gap: 13px; padding: 26px 0 10px; }
.week {
  display: grid; grid-template-columns: 78px 104px 1fr; gap: 18px; align-items: center;
  background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 17px 22px; border-left: 4px solid transparent; scroll-margin-top: 90px;
  transition: opacity .2s ease;
}
.week.past { opacity: .58; }
.week.upcoming { border-left-color: #c6d4e4; }
.week.next {
  border-left-color: var(--accent);
  box-shadow: 0 6px 18px rgba(232, 163, 61, .22), 0 2px 6px rgba(14, 36, 56, .08);
}
.w-badge { font-weight: 700; color: var(--navy); font-size: .98rem; }
.w-badge small { display: block; font-weight: 400; color: var(--muted); font-size: .72rem; }
.w-date { text-align: center; border-right: 1px dashed var(--line); padding-right: 14px; }
.w-date .d { font-size: 1.22rem; font-weight: 700; color: var(--text); line-height: 1.25; }
.w-date .t { font-size: .78rem; color: var(--muted); }
.w-main h3 { margin: 0 0 7px; font-size: 1.06rem; }
.w-meta { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; font-size: .9rem; color: var(--muted); }
.w-meta a { font-weight: 600; }
.cat {
  display: inline-block; padding: 2px 11px; border-radius: 999px; font-size: .78rem; font-weight: 600;
}
.pill {
  display: inline-block; font-size: .74rem; font-weight: 700; color: #fff;
  background: var(--accent); border-radius: 999px; padding: 2px 10px; margin-left: 8px;
  vertical-align: 2px;
}
.week.holiday {
  background: repeating-linear-gradient(-45deg, #f2f4f8, #f2f4f8 10px, #eaeef4 10px, #eaeef4 20px);
  box-shadow: none; border: 1px dashed #cfd8e3; display: block; text-align: center;
  padding: 13px; color: var(--muted); font-size: .95rem;
}
.backup-note {
  margin: 26px 0 10px; background: #fbf6ec; border: 1px solid #efe0bf;
  border-radius: var(--radius); padding: 16px 20px; font-size: .92rem; color: #6b5a34;
}
.backup-note b { color: #584719; }

/* ---------- 教师团队 ---------- */
.t-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(228px, 1fr)); gap: 20px; padding: 26px 0 10px; }
.t-card {
  position: relative;
  background: var(--card); border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow); color: var(--text); transition: transform .15s ease, box-shadow .15s ease;
}
.t-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lift); color: var(--text); }
.t-cover { position: absolute; inset: 0; z-index: 1; }
.t-photo { height: 232px; background: linear-gradient(160deg, #dfe7f0, #cbd7e5); overflow: hidden; }
.t-photo img { width: 100%; height: 100%; object-fit: cover; object-position: center 12%; display: block; }
.t-photo.ph {
  display: flex; align-items: center; justify-content: center;
  font-size: 3rem; font-weight: 700; color: #fff; background: var(--navy-soft);
}
.t-body { padding: 15px 18px 18px; }
.t-name { font-size: 1.12rem; font-weight: 700; color: var(--navy); }
.tag {
  display: inline-block; font-size: .72rem; font-weight: 600; color: var(--navy-soft);
  background: #e8eff8; border-radius: 6px; padding: 1px 8px; margin-left: 8px; vertical-align: 2px;
}
.tag.warn { color: #92400e; background: #fdf1de; }
.t-res {
  color: var(--muted); font-size: .87rem; margin: 8px 0 0; line-height: 1.65;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.t-lec {
  position: relative; z-index: 2;
  margin-top: 12px; font-size: .84rem; color: var(--navy); background: #eef2f7;
  border-radius: 8px; padding: 6px 11px; display: inline-block;
}
.t-lec:hover { background: #e2e9f2; }

/* ---------- 教师详情 ---------- */
.td-wrap { display: grid; grid-template-columns: 300px 1fr; gap: 28px; padding: 30px 0 10px; align-items: start; }
.td-side { position: sticky; top: 86px; }
.td-side .card { padding: 0; overflow: hidden; }
.td-side img.mphoto { width: 100%; display: block; aspect-ratio: 5 / 5.4; object-fit: cover; object-position: center 10%; }
.td-side .m-ph {
  aspect-ratio: 5 / 5.4; display: flex; align-items: center; justify-content: center;
  font-size: 4rem; font-weight: 700; color: #fff; background: var(--navy-soft);
}
.td-side .side-body { padding: 18px 20px 20px; }
.td-side h2 { margin: 0 0 4px; font-size: 1.4rem; color: var(--navy); }
.td-side .m-title { color: var(--accent-deep); font-weight: 600; font-size: .95rem; }
.td-side dl { margin: 14px 0 0; font-size: .9rem; }
.td-side dt { color: var(--muted); font-weight: 500; float: left; margin-right: 10px; }
.td-side dd { margin: 0 0 7px; }
.side-btn {
  display: block; text-align: center; margin-top: 14px; padding: 10px;
  background: var(--navy); color: #fff; border-radius: 10px; font-size: .92rem; font-weight: 600;
}
.side-btn:hover { color: #fff; background: var(--navy-soft); }
.td-main h2 {
  font-size: 1.15rem; color: var(--navy); margin: 26px 0 12px;
  padding-left: 12px; border-left: 4px solid var(--accent);
}
.td-main h2:first-child { margin-top: 2px; }
.res-chips { display: flex; flex-wrap: wrap; gap: 9px; }
.bio p { margin: 0 0 13px; text-align: justify; }
.lec-box {
  background: #fdf7ec; border: 1px solid #f0e2c2; border-radius: var(--radius);
  padding: 16px 20px; font-size: .95rem;
}
.lec-box b { color: var(--navy); }

/* ---------- 成绩构成条 ---------- */
.grade-bar {
  display: flex; gap: 4px; margin: 22px 0 4px; border-radius: 12px; overflow: hidden;
  box-shadow: var(--shadow); font-weight: 700;
}
.grade-seg { padding: 14px 18px; text-align: center; white-space: nowrap; }
.g-att { background: var(--accent); color: #221302; }
.g-rep { background: var(--navy); color: #fff; }
.w-badge-tag {
  display: inline-block; font-size: .74rem; font-weight: 700; color: var(--accent-deep);
  background: rgba(232, 163, 61, .14); border-radius: 999px; padding: 1px 10px;
  margin-left: 8px; vertical-align: 2px;
}

/* ---------- 课程要求 ---------- */
.req-steps { display: flex; flex-direction: column; gap: 16px; padding: 26px 0 6px; }
.step {
  display: flex; gap: 16px; align-items: flex-start;
  background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow); padding: 18px 22px;
}
.step-no {
  flex: none; width: 34px; height: 34px; border-radius: 50%; background: var(--navy); color: #fff;
  display: flex; align-items: center; justify-content: center; font-weight: 700; margin-top: 2px;
}
.step h3 { margin: 0 0 6px; font-size: 1.02rem; color: var(--navy); }
.step p { margin: 0; color: var(--muted); font-size: .93rem; }
.step ul { margin: 6px 0 0; padding-left: 20px; color: var(--muted); font-size: .93rem; }
.mail-btn {
  display: inline-block; margin-top: 22px; background: var(--accent); color: #221302;
  font-weight: 700; padding: 13px 30px; border-radius: 10px; font-size: 1rem;
}
.mail-btn:hover { color: #221302; box-shadow: 0 8px 20px rgba(232, 163, 61, .35); transform: translateY(-2px); }

/* ---------- 课程助教卡片 ---------- */
.ta-card {
  display: flex; gap: 24px; align-items: center; flex-wrap: wrap;
  background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 22px 26px; margin-bottom: 10px;
}
.ta-photo {
  flex: none; width: 112px; height: 148px; border-radius: 12px; overflow: hidden;
  background: linear-gradient(160deg, #dfe7f0, #cbd7e5);
  box-shadow: var(--shadow);
}
.ta-photo img { width: 100%; height: 100%; object-fit: cover; object-position: center 12%; display: block; }
.ta-info { flex: 1 1 300px; min-width: 260px; }
.ta-info h3 { margin: 0 0 8px; font-size: 1.2rem; color: var(--navy); }
.ta-info p { margin: 0 0 8px; color: var(--muted); font-size: .95rem; }
.ta-info .ta-mail { color: var(--text); font-size: .98rem; }
.ta-info .mail-btn { margin-top: 12px; padding: 10px 24px; font-size: .95rem; }
.ta-wechat {
  flex: none; width: 158px; text-align: center; color: var(--muted);
  font-size: .82rem; text-decoration: none;
}
.ta-wechat img {
  width: 100%; border-radius: 12px; border: 1px solid var(--line);
  box-shadow: var(--shadow); display: block; transition: transform .12s ease;
}
.ta-wechat:hover img { transform: translateY(-2px); }
.ta-wechat span { display: block; margin-top: 8px; }

/* ---------- 页脚 ---------- */
.footer { background: var(--navy-deep); color: #8fa5bd; margin-top: 76px; padding: 34px 20px 40px; font-size: .86rem; }
.footer-inner { max-width: 1080px; margin: 0 auto; line-height: 2; }
.footer a { color: #c4d4e6; }
.footer a:hover { color: #fff; }
.footer .f-brand { color: #fff; font-weight: 700; font-size: 1rem; margin-bottom: 4px; }

/* ---------- 响应式 ---------- */
@media (max-width: 760px) {
  .hero { padding: 54px 20px 84px; }
  .week { grid-template-columns: 64px 1fr; }
  .w-date { grid-column: 1 / -1; text-align: left; border-right: 0; border-bottom: 1px dashed var(--line); padding: 0 0 8px; }
  .w-badge { grid-row: 1; }
  .w-main { grid-column: 2; }
  .td-wrap { grid-template-columns: 1fr; }
  .td-side { position: static; max-width: 360px; }
  .nav-inner { flex-wrap: wrap; gap: 10px; }
  .nav-links { margin-left: 0; width: 100%; overflow-x: auto; flex-wrap: nowrap; }
  .next-card { padding: 18px; gap: 14px; }
  .next-count { text-align: left; width: 100%; border-top: 1px solid var(--line); padding-top: 10px; }
}