/* Sudoku Battle 行銷／法務網站共用樣式。色系對齊 App 主題藍 (#2E6BF0)。 */
:root {
  --primary: #2e6bf0;
  --primary-dark: #1e54d6;
  --accent: #3b72f0;
  --bg: #eff2f9;
  --surface: #ffffff;
  --text: #1e2533;
  --text-secondary: #5b6478;
  --text-tertiary: #8a93a6;
  --border: #e3e8f2;
  --radius: 18px;
  --maxw: 960px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang TC",
    "Microsoft JhengHei", "Noto Sans TC", Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── header ── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: saturate(180%) blur(12px);
  background: rgba(239, 242, 249, 0.82);
  border-bottom: 1px solid var(--border);
}
.site-header .inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; color: var(--text); }
.brand img { width: 32px; height: 32px; border-radius: 8px; }
.brand span { font-size: 17px; }
.nav { margin-left: auto; display: flex; align-items: center; gap: 18px; }
.nav a { color: var(--text-secondary); font-size: 14px; font-weight: 600; }
.nav a:hover { color: var(--primary); text-decoration: none; }

/* language switcher */
.langs { display: flex; gap: 6px; align-items: center; font-size: 13px; }
.langs a {
  padding: 4px 8px; border-radius: 8px; color: var(--text-secondary);
  font-weight: 600;
}
.langs a.active { background: var(--primary); color: #fff; }
.langs a:hover { text-decoration: none; }

/* ── hero ── */
.hero {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 72px 20px 48px;
  text-align: center;
}
.hero .logo {
  width: 112px; height: 112px; border-radius: 26px;
  box-shadow: 0 12px 40px rgba(46, 107, 240, 0.28);
  margin-bottom: 22px;
}
.hero h1 { font-size: 40px; font-weight: 800; margin: 0 0 10px; letter-spacing: 1px; }
.hero p.tagline { font-size: 18px; color: var(--text-secondary); margin: 0 auto 28px; max-width: 560px; }
.cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 26px; border-radius: 14px; font-weight: 700; font-size: 15px;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-ghost { background: var(--surface); color: var(--text); border: 1px solid var(--border); }

/* ── features ── */
.features {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 24px 20px 64px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
}
.card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 26px 22px;
  border: 1px solid var(--border);
}
.card .ico { font-size: 30px; }
.card h3 { margin: 12px 0 6px; font-size: 18px; }
.card p { margin: 0; color: var(--text-secondary); font-size: 14px; }

/* ── legal / content pages ── */
.content {
  max-width: 760px;
  margin: 0 auto;
  padding: 48px 20px 72px;
}
.content h1 { font-size: 30px; margin: 0 0 6px; }
.content .updated { color: var(--text-tertiary); font-size: 14px; margin: 0 0 8px; }
.content .notice {
  background: #fff7e6; border: 1px solid #f6d98a; color: #7a5a13;
  border-radius: 12px; padding: 12px 16px; font-size: 13px; margin: 18px 0 28px;
}
.content h2 { font-size: 20px; margin: 32px 0 10px; }
.content p, .content li { color: var(--text-secondary); }
.content ul { padding-left: 20px; }

/* ── footer ── */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
}
.site-footer .inner {
  max-width: var(--maxw); margin: 0 auto; padding: 28px 20px;
  display: flex; flex-wrap: wrap; gap: 8px 24px; align-items: center;
  font-size: 14px; color: var(--text-tertiary);
}
.site-footer .inner a { color: var(--text-secondary); font-weight: 600; }
.site-footer .copyright { margin-left: auto; }

@media (max-width: 560px) {
  .hero { padding-top: 48px; }
  .hero h1 { font-size: 32px; }
  .nav a:not(.langs-link) { display: none; }
}