/* ============================================================
   ATP CLUB BLOG — shared stylesheet
   要同步首頁風格:只改下面 :root 的變數就好,其他不用動
   ============================================================ */
/* 已同步首頁 design tokens(cream / ink / core yellow) */
:root {
  --paper: #EAE6D8;
  --ink: #1B1A16;
  --ink-soft: #6F6460;
  --court: #1B1A16;
  --court-deep: #252420;
  --ball: #E7E14C;
  --line: rgba(27,26,22,0.16);
  --card: #F2EFE4;
  --radius: 10px;
  --w-article: 720px;
  --w-wide: 1080px;
  --font-display: "Archivo", system-ui, sans-serif;
  --font-body: "Archivo", system-ui, sans-serif;
  --font-mono: "Space Mono", monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.075rem;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

/* ---------- header ---------- */
.site-header {
  border-bottom: 2px solid var(--ink);
  background: var(--paper);
}
.site-header .bar {
  max-width: var(--w-wide);
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
}
.brand span { color: var(--court); }
.site-nav a {
  font-family: var(--font-display);
  font-size: .82rem;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--ink-soft);
  text-decoration: none;
  margin-left: 18px;
}
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--court); }

/* ---------- 標籤(scoreboard 風) ---------- */
.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: #1B1A16;
  background: var(--ball);
  padding: 3px 10px;
  border-radius: 3px;
}

/* ---------- blog 列表頁 ---------- */
.blog-hero {
  max-width: var(--w-wide);
  margin: 0 auto;
  padding: 56px 20px 32px;
  border-bottom: 1px solid var(--line);
}
.blog-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1.05;
  letter-spacing: -.01em;
  text-transform: uppercase;
  max-width: 18ch;
}
.blog-hero p {
  margin-top: 14px;
  color: var(--ink-soft);
  max-width: 52ch;
}
.post-list {
  max-width: var(--w-wide);
  margin: 0 auto;
  padding: 32px 20px 64px;
  display: grid;
  gap: 22px;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  list-style: none;
}
.post-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--card);
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: border-color .15s ease, transform .15s ease;
}
.post-card:hover { border-color: var(--court); transform: translateY(-2px); }
.post-card h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  line-height: 1.25;
}
.post-card h2 a { color: var(--ink); text-decoration: none; }
.post-card h2 a:hover { color: var(--court); }
.post-card .meta {
  font-family: var(--font-display);
  font-size: .78rem;
  color: var(--ink-soft);
  letter-spacing: .04em;
}
.post-card .excerpt { color: var(--ink-soft); font-size: .98rem; }

/* ---------- 文章頁 ---------- */
.article-head {
  max-width: var(--w-article);
  margin: 0 auto;
  padding: 52px 20px 8px;
}
.article-head h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.8rem, 4.5vw, 2.7rem);
  line-height: 1.12;
  letter-spacing: -.01em;
  margin-top: 14px;
}
.article-head .meta {
  margin-top: 12px;
  font-family: var(--font-display);
  font-size: .82rem;
  color: var(--ink-soft);
  letter-spacing: .04em;
  padding-bottom: 20px;
  /* 球場邊線 signature:雙細線 */
  border-bottom: 4px double var(--ink);
}
article.post-body {
  max-width: var(--w-article);
  margin: 0 auto;
  padding: 24px 20px 48px;
}
.post-body h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.5rem;
  line-height: 1.25;
  margin: 2.2em 0 .6em;
}
.post-body h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  margin: 1.8em 0 .5em;
}
.post-body p { margin: .9em 0; }
.post-body ul, .post-body ol { margin: .9em 0 .9em 1.4em; }
.post-body li { margin: .35em 0; }
.post-body a { color: var(--court); text-underline-offset: 3px; }
.post-body a:hover { color: var(--court-deep); }
.post-body strong { font-weight: 650; }
.post-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.2em 0;
  font-size: .95rem;
}
.post-body th, .post-body td {
  border: 1px solid var(--line);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}
.post-body th {
  font-family: var(--font-display);
  font-size: .8rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  background: rgba(27,26,22,0.06);
}
.post-body .callout {
  border-left: 4px solid var(--ball);
  background: var(--card);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 16px 18px;
  margin: 1.4em 0;
}

/* ---------- CTA ---------- */
.cta-box {
  max-width: var(--w-article);
  margin: 8px auto 64px;
  padding: 0 20px;
}
.cta-box .inner {
  background: var(--court-deep);
  color: #fff;
  border-radius: var(--radius);
  padding: 30px 26px;
}
.cta-box h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.4rem;
  text-transform: uppercase;
  letter-spacing: .02em;
}
.cta-box p { margin: 10px 0 18px; color: rgba(234,230,217,0.75); }
.btn-wa {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: .95rem;
  letter-spacing: .04em;
  color: #1B1A16;
  background: var(--ball);
  padding: 12px 22px;
  border-radius: 6px;
  text-decoration: none;
}
.btn-wa:hover { filter: brightness(1.06); }
.btn-wa:focus-visible, a:focus-visible {
  outline: 3px solid var(--court);
  outline-offset: 2px;
}

/* ---------- footer ---------- */
.site-footer {
  border-top: 2px solid var(--ink);
  padding: 26px 20px 40px;
}
.site-footer .inner {
  max-width: var(--w-wide);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  font-family: var(--font-display);
  font-size: .82rem;
  color: var(--ink-soft);
}
.site-footer a { color: var(--court); text-decoration: none; }
.site-footer a:hover { text-decoration: underline; }