/* ===== 海環系學會網站 · 分頁式樣式 =====
   想換主色 → 改下面的 --accent 一行就好 */

:root {
  --ink: #0f172a;
  --ink-soft: #475569;
  --line: #e2e8f0;
  --bg: #ffffff;
  --bg-soft: #f8fafc;
  --accent: #507959;        /* ← 主色（海洋藍綠）。想換色改這裡 */
  --accent-soft: #e6f2f4;
  --radius: 14px;
  --maxw: 1080px;
  --shadow: 0 1px 2px rgba(15,23,42,.04), 0 8px 24px rgba(15,23,42,.05);
  --font: "Noto Sans TC", -apple-system, "PingFang TC", "Microsoft JhengHei", sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ===== Header + 分頁籤 ===== */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.9);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; min-height: 68px; flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 12px; cursor: pointer; }
.brand-logo {
  width: 40px; height: 40px; border-radius: 10px;
  background: var(--accent); color: #fff;
  display: grid; place-items: center;
  font-weight: 700; font-size: 15px; letter-spacing: 1px;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.25; }
.brand-name { font-weight: 700; font-size: 16px; }
.brand-sub { font-size: 12px; color: var(--ink-soft); }

/* 分頁籤 */
.tabs { display: flex; gap: 6px; flex-wrap: wrap; }
.tab-btn {
  font-size: 15px; font-family: inherit; color: var(--ink-soft);
  background: none; border: 0; cursor: pointer;
  padding: 8px 16px; border-radius: 999px; transition: .18s;
}
.tab-btn:hover { color: var(--accent); background: var(--accent-soft); }
.tab-btn.active { color: #fff; background: var(--accent); }

/* ===== 分頁內容切換 ===== */
.page { display: none; }
.page.active { display: block; animation: fade .25s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* ===== Hero（首頁） ===== */
.hero {
  padding: 88px 0 72px;
  border-bottom: 1px solid var(--line);
  background: radial-gradient(1200px 400px at 80% -10%, var(--accent-soft), transparent 60%);
}
.hero h1 {
  font-size: clamp(30px, 5vw, 48px);
  font-weight: 800; letter-spacing: -.5px; line-height: 1.2; max-width: 16ch;
}
.hero p { margin-top: 20px; font-size: 18px; color: var(--ink-soft); max-width: 48ch; }
.hero-actions { margin-top: 32px; display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 22px; border-radius: 999px; border: 0; font-family: inherit;
  font-size: 15px; font-weight: 600; cursor: pointer;
  transition: transform .15s, box-shadow .2s, background .2s, border-color .2s;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { transform: translateY(-1px); box-shadow: var(--shadow); }
.btn-ghost { border: 1px solid var(--line); color: var(--ink); background: #fff; }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

/* 首頁「近期消息」預覽 */
.home-recent { padding: 64px 0 72px; }

/* ===== Section ===== */
.section { padding: 64px 0; }
.section-head {
  display: flex; align-items: baseline; justify-content: space-between;
  margin-bottom: 32px; flex-wrap: wrap; gap: 8px;
}
.section-head h2 { font-size: 26px; font-weight: 800; letter-spacing: -.3px; }
.section-head .eyebrow {
  font-size: 13px; font-weight: 700; letter-spacing: 2px;
  color: var(--accent); text-transform: uppercase; margin-bottom: 8px;
}

/* ===== 消息卡片 ===== */
.news-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.card {
  display: flex; flex-direction: column; text-align: left;
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--bg); overflow: hidden; cursor: pointer;
  transition: transform .18s, box-shadow .25s, border-color .2s;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: #cbd5e1; }
.card.featured { grid-column: 1 / -1; }
.card-cover {
  height: 180px; background: var(--accent-soft);
  background-size: cover; background-position: center;
  display: grid; place-items: center; color: var(--accent);
  font-size: 13px; letter-spacing: 2px;
}
.card.featured .card-cover { height: 220px; }
.card-body { padding: 22px 24px 26px; display: flex; flex-direction: column; flex: 1; }
.card-meta { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.tag {
  font-size: 12px; font-weight: 700; letter-spacing: .5px;
  padding: 4px 10px; border-radius: 999px;
  background: var(--accent-soft); color: var(--accent);
}
.tag.pin { background: #fef3c7; color: #92600a; }
.date { font-size: 13px; color: var(--ink-soft); }
.card-title { font-size: 19px; font-weight: 700; line-height: 1.45; }
.card.featured .card-title { font-size: 24px; }
.card-summary { margin-top: 12px; color: var(--ink-soft); font-size: 15px; flex: 1; }
.card-more { margin-top: 18px; font-size: 14px; font-weight: 600; color: var(--accent); }

/* ===== 關於 / 聯絡 ===== */
.about-intro { max-width: 70ch; color: var(--ink-soft); font-size: 16px; margin-bottom: 36px; }
.split { display: grid; grid-template-columns: 1.2fr 1fr; gap: 56px; align-items: start; }
.split p { color: var(--ink-soft); font-size: 16px; }
.info-list { list-style: none; display: flex; flex-direction: column; gap: 16px; }
.info-list li { display: flex; flex-direction: column; gap: 2px; }
.info-list .k { font-size: 13px; letter-spacing: 1px; color: var(--accent); font-weight: 700; }
.info-list .v { font-size: 16px; }

/* ===== 消息詳情 ===== */
.post-back {
  font-size: 14px; color: var(--ink-soft); background: none; border: 0;
  font-family: inherit; cursor: pointer; display: inline-flex; gap: 6px; margin-bottom: 22px;
}
.post-back:hover { color: var(--accent); }
.post-detail { padding: 48px 0 80px; }
.post-title { font-size: clamp(26px, 4vw, 38px); font-weight: 800; line-height: 1.25; margin-top: 14px; max-width: 24ch; }
.post-cover {
  height: 300px; border-radius: var(--radius); background: var(--accent-soft);
  background-size: cover; background-position: center; margin: 28px 0;
  display: grid; place-items: center; color: var(--accent); letter-spacing: 2px;
}
.post-prose { max-width: 70ch; font-size: 17px; color: #1e293b; white-space: pre-wrap; margin-top: 24px; }

/* 自由排版積木 */
.post-subhead { font-size: 22px; font-weight: 800; margin: 36px 0 4px; letter-spacing: -.2px; }
.post-figure { margin: 24px 0 0; }
.post-figure img {
  width: 100%; height: auto; display: block;
  border-radius: var(--radius); object-fit: cover;
}
.post-figure figcaption { margin-top: 10px; font-size: 14px; color: var(--ink-soft); text-align: center; }
.post-detail .post-gallery { margin-top: 24px; }

/* ===== 輪播圖片 Carousel ===== */
.carousel {
  position: relative; border-radius: var(--radius); overflow: hidden;
  background: #0b1220; box-shadow: var(--shadow); user-select: none;
}
.carousel-track { display: flex; transition: transform .45s cubic-bezier(.4,0,.2,1); }
.carousel-slide { min-width: 100%; }
.carousel-slide img {
  width: 100%; height: clamp(220px, 42vw, 460px);
  object-fit: cover; display: block;
}
.carousel-caption {
  position: absolute; left: 0; right: 0; bottom: 0;
  padding: 40px 24px 18px; color: #fff; font-size: 15px;
  background: linear-gradient(transparent, rgba(0,0,0,.6));
}
.carousel-btn {
  position: absolute; top: 50%; transform: translateY(-50%);
  width: 42px; height: 42px; border: 0; border-radius: 50%; cursor: pointer;
  background: rgba(255,255,255,.85); color: var(--ink);
  font-size: 22px; line-height: 1; display: grid; place-items: center;
  transition: background .2s, transform .15s;
}
.carousel-btn:hover { background: #fff; }
.carousel-btn:active { transform: translateY(-50%) scale(.92); }
.carousel-btn.prev { left: 14px; }
.carousel-btn.next { right: 14px; }
.carousel-dots {
  position: absolute; left: 0; right: 0; bottom: 14px;
  display: flex; justify-content: center; gap: 8px;
}
.carousel-dots .dot {
  width: 9px; height: 9px; border-radius: 50%; border: 0; padding: 0; cursor: pointer;
  background: rgba(255,255,255,.55); transition: background .2s, transform .2s;
}
.carousel-dots .dot.active { background: #fff; transform: scale(1.25); }
.home-carousel-wrap { padding: 28px 0 0; }
.post-gallery { margin-top: 32px; }

/* ===== 可調色連結按鈕 ===== */
.link-btns { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.link-btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 22px; border-radius: 999px;
  font-size: 15px; font-weight: 600; cursor: pointer;
  border: 1px solid var(--line); color: var(--ink); background: #fff;
  transition: transform .15s, box-shadow .2s, opacity .2s;
}
.link-btn:hover { transform: translateY(-1px); box-shadow: var(--shadow); }
.link-btn.solid:hover { opacity: .88; }

/* ===== Footer ===== */
.site-footer { padding: 48px 0; border-top: 1px solid var(--line); background: var(--bg-soft); }
.footer-inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 18px; }
.footer-note { color: var(--ink-soft); font-size: 14px; }
.social { display: flex; gap: 14px; }
.social a {
  font-size: 14px; color: var(--ink-soft);
  padding: 8px 16px; border: 1px solid var(--line); border-radius: 999px; transition: .2s; background: #fff;
}
.social a:hover { border-color: var(--accent); color: var(--accent); }
.notify-btn {
  font-family: inherit; font-size: 14px; font-weight: 600; cursor: pointer;
  color: #fff; background: var(--accent); border: 1px solid var(--accent);
  padding: 8px 16px; border-radius: 999px; transition: opacity .2s;
}
.notify-btn:hover { opacity: .88; }

/* ===== 手機版（寬鬆版面） ===== */
@media (max-width: 820px) {
  .container { padding: 0 22px; }

  /* 頁首與分頁籤：留白大一點、按鈕好按 */
  .header-inner { min-height: 0; padding: 14px 0; gap: 14px; }
  .tabs { width: 100%; justify-content: flex-start; overflow-x: auto; gap: 8px; padding-bottom: 4px; -webkit-overflow-scrolling: touch; }
  .tab-btn { padding: 10px 18px; flex: 0 0 auto; }

  /* 區塊上下呼吸空間加大 */
  .hero { padding: 52px 0 44px; }
  .hero p { margin-top: 16px; }
  .section { padding: 44px 0; }
  .home-recent { padding: 44px 0 52px; }
  .home-carousel-wrap { padding: 20px 0 0; }
  .section-head { margin-bottom: 28px; }

  /* 卡片：單欄、間距與內距加大 */
  .news-grid { grid-template-columns: 1fr; gap: 20px; }
  .card-body { padding: 24px 22px 26px; }
  .card-summary { margin-top: 14px; }
  .split { grid-template-columns: 1fr; gap: 28px; }

  /* 內頁文字更好讀、段落更鬆 */
  .post-detail { padding: 36px 0 64px; }
  .post-prose { font-size: 16.5px; line-height: 1.9; margin-top: 20px; }
  .post-title { margin-top: 12px; }
  .post-subhead { margin: 30px 0 4px; }
  .post-figure { margin-top: 20px; }

  /* 按鈕：加大觸控範圍、間距鬆一點 */
  .link-btns { gap: 12px; margin-top: 22px; }
  .link-btn { padding: 13px 22px; }

  /* 頁尾改直排、社群按鈕好點 */
  .footer-inner { flex-direction: column; align-items: flex-start; gap: 22px; }
  .social { flex-wrap: wrap; gap: 12px; }
  .social a { padding: 10px 18px; }
}

/* ===== 更小的手機（例如 iPhone SE） ===== */
@media (max-width: 480px) {
  .container { padding: 0 18px; }
  .hero h1 { font-size: 28px; }
  .card-cover { height: 200px; }
  .hero-actions { gap: 12px; }
  .hero-actions .btn { width: 100%; justify-content: center; }
}