:root {
  --bg-deep: #042a3a;
  --bg: #073b4c;
  --bg-card: #0b5163;
  --teal: #1f9aa8;
  --teal-bright: #3ecfcf;
  --sand: #f4e4c1;
  --foam: #e8fbff;
  --text: #eaf7fb;
  --muted: #a9d0da;
  --danger: #ff7b7b;
  --ok: #7dffb3;
  --shadow: 0 12px 40px rgba(0, 20, 30, 0.35);
  --radius: 18px;
  --font: "Segoe UI", system-ui, -apple-system, "Noto Sans TC", "PingFang HK", sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(62, 207, 207, 0.25), transparent 60%),
    radial-gradient(900px 500px at 90% 0%, rgba(244, 228, 193, 0.12), transparent 50%),
    linear-gradient(180deg, #031820 0%, var(--bg-deep) 35%, #06485a 100%);
  min-height: 100vh;
  line-height: 1.55;
}
a { color: var(--teal-bright); }
img { max-width: 100%; height: auto; }
.wrap { width: min(1080px, calc(100% - 2rem)); margin: 0 auto; }
.site-header {
  position: sticky; top: 0; z-index: 20;
  backdrop-filter: blur(10px);
  background: rgba(4, 42, 58, 0.82);
  border-bottom: 1px solid rgba(232, 251, 255, 0.08);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: 0.85rem 0; flex-wrap: wrap;
}
.brand {
  font-weight: 800; letter-spacing: 0.02em; color: var(--foam); text-decoration: none; font-size: 1.2rem;
}
.nav-links { display: flex; gap: 0.75rem; flex-wrap: wrap; align-items: center; }
.nav-links a {
  color: var(--foam); text-decoration: none; padding: 0.35rem 0.65rem; border-radius: 999px;
}
.nav-links a:hover, .nav-links a[aria-current="page"] { background: rgba(62, 207, 207, 0.18); }
.lang-switch select {
  background: var(--bg-card); color: var(--foam); border: 1px solid rgba(232,251,255,0.2);
  border-radius: 999px; padding: 0.35rem 0.7rem;
}
.hero {
  display: grid; gap: 1.5rem; padding: 2.5rem 0 2rem;
  grid-template-columns: 1.2fr 1fr; align-items: center;
}
@media (max-width: 840px) { .hero { grid-template-columns: 1fr; } }
.hero h1 { font-size: clamp(2rem, 5vw, 3.2rem); line-height: 1.1; margin: 0 0 0.75rem; color: var(--foam); }
.hero p.lead { font-size: 1.15rem; color: var(--muted); margin: 0 0 1.25rem; }
.hero-art {
  border-radius: calc(var(--radius) + 6px); overflow: hidden; box-shadow: var(--shadow);
  border: 1px solid rgba(232,251,255,0.12);
}
.hero-art img { display: block; width: 100%; }
.btn-row { display: flex; gap: 0.75rem; flex-wrap: wrap; }
.btn {
  appearance: none; border: 0; cursor: pointer; text-decoration: none;
  display: inline-flex; align-items: center; justify-content: center; gap: 0.4rem;
  border-radius: 999px; padding: 0.75rem 1.2rem; font-weight: 700;
}
.btn-primary { background: linear-gradient(135deg, var(--teal-bright), var(--teal)); color: #042a3a; }
.btn-secondary { background: rgba(232,251,255,0.08); color: var(--foam); border: 1px solid rgba(232,251,255,0.2); }
.btn:disabled { opacity: 0.55; cursor: not-allowed; }
.section { padding: 2rem 0; }
.section h2 { margin: 0 0 1rem; font-size: 1.6rem; color: var(--sand); }
.cards { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.card {
  background: rgba(11, 81, 99, 0.72); border: 1px solid rgba(232,251,255,0.1);
  border-radius: var(--radius); padding: 1.1rem 1.15rem; box-shadow: var(--shadow);
}
.card h3 { margin: 0 0 0.4rem; color: var(--foam); }
.muted { color: var(--muted); }
.faq details {
  background: rgba(11,81,99,0.55); border-radius: 14px; padding: 0.85rem 1rem; margin-bottom: 0.6rem;
  border: 1px solid rgba(232,251,255,0.08);
}
.faq summary { cursor: pointer; font-weight: 700; color: var(--foam); }
.site-footer {
  margin-top: 3rem; padding: 2rem 0 2.5rem; border-top: 1px solid rgba(232,251,255,0.08);
  color: var(--muted); font-size: 0.95rem;
}
.chip {
  display: inline-block; font-size: 0.85rem; padding: 0.2rem 0.55rem; border-radius: 999px;
  background: rgba(62,207,207,0.15); color: var(--teal-bright);
}
.chip.warn { background: rgba(255,123,123,0.15); color: #ffc2c2; }
.status { font-size: 0.8rem; text-transform: none; letter-spacing: 0.01em; }
.idea {
  display: grid; gap: 0.6rem; grid-template-columns: 1fr auto; align-items: start;
}
.idea-meta { display: flex; gap: 0.4rem; flex-wrap: wrap; align-items: center; }
.vote-btn { min-width: 6.5rem; }
.form-stack { display: grid; gap: 0.75rem; }
label { display: grid; gap: 0.35rem; font-weight: 600; }
input, textarea, select {
  width: 100%; border-radius: 12px; border: 1px solid rgba(232,251,255,0.2);
  background: rgba(4,42,58,0.55); color: var(--foam); padding: 0.7rem 0.8rem; font: inherit;
}
textarea { min-height: 110px; resize: vertical; }
.banner {
  background: rgba(244,228,193,0.12); border: 1px solid rgba(244,228,193,0.35);
  color: var(--sand); padding: 0.75rem 1rem; border-radius: 12px; margin: 1rem 0;
}
.error { color: var(--danger); }
.ok { color: var(--ok); }
.hidden { display: none !important; }
.board-list { display: grid; gap: 0.75rem; }
.board-list a {
  display: block; text-decoration: none; color: inherit; padding: 1rem; border-radius: var(--radius);
  background: rgba(11,81,99,0.65); border: 1px solid rgba(232,251,255,0.1);
}
.thread { border-bottom: 1px solid rgba(232,251,255,0.08); padding: 0.85rem 0; }
.post {
  background: rgba(4,42,58,0.35); border-radius: 12px; padding: 0.85rem; margin: 0.6rem 0;
  border: 1px solid rgba(232,251,255,0.08);
}
.admin-grid { display: grid; gap: 1rem; }
.admin-item { background: rgba(4,42,58,0.4); padding: 0.85rem; border-radius: 12px; }
.cf-turnstile { margin: 0.25rem 0; }