/* ─────────────────────────────────────────────────────────────
   Shared CSS for sub-pages (about / how-to-join / rules / terms / privacy)
   Matches design tokens & top/bottom chrome with index.html
   ───────────────────────────────────────────────────────────── */

:root {
  --cream: #f5f0e8;
  --warm-white: #fdfaf4;
  --paper: #eee5d7;

  --deep: #0f0e0d;
  --deep-2: #171511;
  --deep-3: #211d18;
  --charcoal: #2c2a27;

  --muted: #8a7f72;
  --muted-light: #b8ad9e;

  --green: #485244;
  --green-soft: #dfe5d8;

  --sand: #c8ad8d;
  --sand-soft: #efe2d2;

  --accent: #c17f4a;
  --accent-light: #e8c99a;
  --rust: #9c4a2c;

  --border: #d9d0c0;
  --border-dark: rgba(44, 42, 39, 0.18);
  --border-light: rgba(245, 240, 232, 0.18);

  --shadow: 0 24px 70px rgba(31, 24, 16, 0.18);

  --font-zh-title: "Noto Serif TC", serif;
  --font-zh-body: "Noto Sans TC", sans-serif;
  --font-en-title: "Fraunces", "Montserrat", serif;
  --font-en: "Montserrat", sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  min-height: 100vh;
  background: var(--deep);
  color: var(--cream);
  font-family: var(--font-zh-body);
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.52;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.82' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.055'/%3E%3C/svg%3E");
  mix-blend-mode: overlay;
}

a { color: inherit; text-decoration: none; }
button, input, textarea, select { font: inherit; }
button { -webkit-tap-highlight-color: transparent; }

.page { position: relative; z-index: 1; overflow: hidden; }
.wrap { width: min(1120px, calc(100% - 36px)); margin: 0 auto; }
.narrow { width: min(720px, calc(100% - 36px)); margin: 0 auto; }

/* ── Topbar ─────────────────────────────────────────── */
.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  color: var(--cream);
  background: linear-gradient(to bottom, rgba(15, 14, 13, 0.86), rgba(15, 14, 13, 0.55));
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(245, 240, 232, 0.06);
}

.topbar-inner {
  height: 86px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand { display: flex; align-items: center; gap: 14px; }
.logo-mark { width: 62px; height: 50px; display: grid; place-items: center; flex-shrink: 0; }
.logo-img { width: 100%; height: 100%; display: block; object-fit: contain; }

.brand-primary {
  display: block;
  font-family: var(--font-zh-title);
  font-size: 17px;
  line-height: 1;
  letter-spacing: 0.2em;
  font-weight: 600;
  white-space: nowrap;
}

.brand-secondary {
  display: block;
  margin-top: 6px;
  font-family: var(--font-en);
  font-size: 9px;
  letter-spacing: 0.26em;
  font-weight: 500;
  white-space: nowrap;
  opacity: 0.64;
}

.nav-links {
  display: none;
  align-items: center;
  gap: 24px;
  font-family: var(--font-en);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.18em;
  opacity: 0.78;
  text-transform: uppercase;
}

.nav-links a { position: relative; padding-bottom: 6px; }
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 18px; height: 1px;
  background: currentColor;
  opacity: 0.45;
  transition: width 0.2s ease;
}
.nav-links a:hover::after { width: 100%; }

.menu-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  width: 38px; height: 30px;
  background: none;
  border: 0;
  color: currentColor;
  cursor: pointer;
}

.menu-icon span {
  display: block;
  width: 100%;
  height: 4px;
  border-radius: 999px;
  background: currentColor;
  margin-bottom: 7px;
  transition: transform 0.25s ease, opacity 0.2s ease;
}
.menu-icon span:last-child { margin-bottom: 0; }
.menu-icon[aria-expanded="true"] span:nth-child(1) { transform: translateY(11px) rotate(45deg); }
.menu-icon[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-icon[aria-expanded="true"] span:nth-child(3) { transform: translateY(-11px) rotate(-45deg); }

/* ── Mobile menu ─────────────────────────────────────── */
.mobile-menu {
  position: fixed;
  top: 86px; left: 0; right: 0;
  background: rgba(15, 14, 13, 0.98);
  backdrop-filter: blur(16px);
  padding: 28px 24px 40px;
  display: flex;
  flex-direction: column;
  gap: 0;
  z-index: 90;
  max-height: calc(100vh - 86px);
  overflow-y: auto;
  transform: translateY(-12px);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: transform 0.28s ease, opacity 0.22s ease, visibility 0s linear 0.22s;
  box-shadow: 0 24px 48px rgba(0,0,0,0.5);
}
.mobile-menu.open {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transition: transform 0.28s ease, opacity 0.22s ease, visibility 0s linear 0s;
}
.mobile-menu[hidden] { display: none; }

.mobile-menu-group {
  padding-top: 24px;
  padding-bottom: 4px;
  border-top: 1px solid rgba(245, 240, 232, 0.1);
}
.mobile-menu-group:first-child {
  padding-top: 0;
  border-top: none;
}

.mobile-menu-group-label {
  display: block;
  margin: 0 4px 14px;
  font-family: var(--font-en);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: rgba(245, 240, 232, 0.5);
}

.mobile-menu-group a {
  display: block;
  color: var(--cream);
  font-family: var(--font-zh-body);
  font-size: 16px;
  font-weight: 400;
  letter-spacing: 0.05em;
  padding: 14px 4px;
  text-decoration: none;
  line-height: 1.4;
  opacity: 0.9;
  transition: opacity 0.15s ease, transform 0.15s ease;
}
.mobile-menu-group a:hover,
.mobile-menu-group a:active {
  opacity: 1;
  transform: translateX(2px);
}

/* Member group: distinct visual treatment with prominent login */
.mobile-menu-member {
  padding-top: 0;
  border-top: none;
  margin-bottom: 4px;
}

.mobile-menu-login {
  display: flex !important;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 16px 20px !important;
  background: rgba(193, 127, 74, 0.16);
  border: 1px solid rgba(193, 127, 74, 0.5);
  color: var(--accent-light) !important;
  border-radius: 14px;
  font-size: 15px !important;
  font-weight: 600 !important;
  letter-spacing: 0.08em !important;
  opacity: 1 !important;
  text-align: center;
}
.mobile-menu-login::before {
  content: "→";
  opacity: 0.7;
}
.mobile-menu-login:hover {
  background: rgba(193, 127, 74, 0.22);
  transform: none !important;
}

.mobile-menu-member-link {
  font-size: 14px !important;
  color: rgba(245, 240, 232, 0.74) !important;
}

.mobile-menu-signout {
  font-size: 13px !important;
  color: rgba(245, 240, 232, 0.46) !important;
}

/* Bottom CTA */
.mobile-menu-bottom-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin-top: 28px;
  padding: 16px 22px;
  background: var(--accent);
  color: var(--warm-white) !important;
  border-radius: 999px;
  font-family: var(--font-zh-body);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-decoration: none;
  text-align: center;
  box-shadow: 0 12px 30px rgba(193, 127, 74, 0.32);
}
.mobile-menu-bottom-cta:hover {
  background: var(--rust);
}

/* Desktop nav CTA pill button */
.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 18px;
  background: var(--accent);
  color: var(--warm-white);
  border-radius: 999px;
  font-family: var(--font-zh-body);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  white-space: nowrap;
  transition: transform 0.18s ease, background 0.2s ease;
}
.nav-cta:hover {
  transform: translateY(-1px);
  background: #d4925a;
}
@media (max-width: 640px) {
  .nav-cta {
    display: none;
  }
}

/* ── Sub-page hero ──────────────────────────────────── */
.subpage-hero {
  padding: 168px 0 56px;
  background:
    radial-gradient(ellipse at 30% 0%, rgba(193, 127, 74, 0.22), transparent 60%),
    radial-gradient(ellipse at 80% 100%, rgba(72, 82, 68, 0.28), transparent 70%),
    linear-gradient(to bottom, var(--deep-3), var(--deep));
  border-bottom: 1px solid rgba(245, 240, 232, 0.06);
}

/* Photo-backdrop variant — uses a real <img> child for reliable cross-browser path resolution */
.subpage-hero--photo {
  position: relative;
  background: var(--deep);
  padding: 188px 0 88px;
  overflow: hidden;
  isolation: isolate;
}
.subpage-hero-photo {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  filter: saturate(0.85) contrast(1.05);
  z-index: 0;
  display: block;
}
.subpage-hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to bottom, rgba(15, 14, 13, 0.55) 0%, rgba(15, 14, 13, 0.78) 75%, var(--deep) 100%),
    radial-gradient(ellipse at 50% 100%, rgba(15, 14, 13, 0.4), transparent 70%);
  pointer-events: none;
  z-index: 1;
}
.subpage-hero--photo .subpage-hero-inner { position: relative; z-index: 2; }
.subpage-hero--photo .subpage-title,
.subpage-hero--photo .subpage-lede,
.subpage-hero--photo .subpage-kicker {
  text-shadow: 0 2px 22px rgba(0, 0, 0, 0.55);
}

.subpage-hero-inner {
  text-align: center;
  max-width: 760px;
  margin: 0 auto;
}

.subpage-kicker {
  font-family: var(--font-en);
  font-weight: 500;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--sand);
  font-size: 0.78rem;
  margin-bottom: 18px;
}

.subpage-title {
  font-family: var(--font-zh-title);
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  font-weight: 600;
  letter-spacing: 0.04em;
  line-height: 1.25;
  margin-bottom: 24px;
}

.subpage-lede {
  font-family: var(--font-zh-body);
  color: rgba(245, 240, 232, 0.82);
  font-size: 1.05rem;
  line-height: 1.9;
  letter-spacing: 0.03em;
}

/* ── Sub-page body / prose ──────────────────────────── */
.subpage-body { padding: 72px 0 96px; }

.prose {
  font-family: var(--font-zh-body);
  color: rgba(245, 240, 232, 0.88);
  font-size: 1rem;
  line-height: 2;
  letter-spacing: 0.02em;
}

.prose p { margin-bottom: 22px; }

.prose h2 {
  font-family: var(--font-zh-title);
  font-size: clamp(1.4rem, 2.6vw, 1.7rem);
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--cream);
  margin: 56px 0 18px;
  padding-top: 8px;
}

.prose h3 {
  font-family: var(--font-zh-title);
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--cream);
  margin: 32px 0 12px;
}

.prose ul,
.prose ol {
  margin: 0 0 22px;
  padding-left: 1.4em;
}
.prose ul li,
.prose ol li {
  margin-bottom: 10px;
  padding-left: 8px;
}

.prose ul li::marker { color: var(--accent); }
.prose ol li::marker { color: var(--accent); font-family: var(--font-en); font-weight: 600; }

.prose a {
  color: var(--accent-light);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.prose strong { color: var(--cream); font-weight: 600; }

.prose-divider {
  border: none;
  border-top: 1px solid rgba(245, 240, 232, 0.12);
  margin: 48px 0;
}

.prose-callout {
  margin: 32px 0;
  padding: 22px 26px;
  background: rgba(193, 127, 74, 0.08);
  border-left: 3px solid var(--accent);
  border-radius: 6px;
  font-size: 0.96rem;
  line-height: 1.85;
}

.prose-callout strong {
  display: block;
  margin-bottom: 6px;
  color: var(--accent-light);
  font-size: 0.82rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-family: var(--font-en);
}

/* ── Step list (how-to-join) ────────────────────────── */
.steps {
  list-style: none;
  padding: 0;
  margin: 40px 0;
  display: grid;
  gap: 14px;
}

.steps li {
  display: grid;
  grid-template-columns: 56px 1fr;
  align-items: start;
  gap: 18px;
  padding: 22px 24px;
  background: rgba(245, 240, 232, 0.04);
  border: 1px solid rgba(245, 240, 232, 0.1);
  border-radius: 14px;
}

.steps .step-num {
  font-family: var(--font-en);
  font-weight: 600;
  font-size: 1.1rem;
  letter-spacing: 0.08em;
  color: var(--accent-light);
  width: 44px;
  height: 44px;
  border-radius: 999px;
  background: rgba(193, 127, 74, 0.14);
  display: grid;
  place-items: center;
}

.steps .step-body { padding-top: 8px; }
.steps .step-body strong {
  display: block;
  color: var(--cream);
  font-size: 1.04rem;
  margin-bottom: 6px;
  letter-spacing: 0.03em;
}
.steps .step-body p {
  color: rgba(245, 240, 232, 0.78);
  font-size: 0.95rem;
  line-height: 1.85;
  margin: 0;
}

/* ── Rule items (rules.html) ────────────────────────── */
.rule-items {
  list-style: none;
  margin: 32px 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.rule-items li {
  padding: 22px 24px;
  background: rgba(245, 240, 232, 0.04);
  border: 1px solid rgba(245, 240, 232, 0.1);
  border-radius: 14px;
}

.rule-items strong {
  display: block;
  color: var(--cream);
  font-size: 1.05rem;
  margin-bottom: 8px;
  letter-spacing: 0.03em;
}

.rule-items p {
  color: rgba(245, 240, 232, 0.78);
  font-size: 0.95rem;
  line-height: 1.85;
  margin: 0;
}

/* ── Buttons (shared) ───────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 26px;
  border-radius: 999px;
  font-family: var(--font-zh-body);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.18s ease, background 0.2s ease, color 0.2s ease;
}
.btn:hover { transform: translateY(-1px); }

.btn-light {
  background: var(--cream);
  color: var(--deep);
}
.btn-light:hover { background: var(--warm-white); }

.btn-ghost {
  background: transparent;
  color: var(--cream);
  border-color: rgba(245, 240, 232, 0.32);
}
.btn-ghost:hover { background: rgba(245, 240, 232, 0.08); }

.subpage-cta-row {
  margin-top: 56px;
  padding-top: 32px;
  border-top: 1px solid rgba(245, 240, 232, 0.1);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ── Footer ─────────────────────────────────────────── */
.site-footer {
  background: var(--deep-2);
  border-top: 1px solid rgba(245, 240, 232, 0.06);
  padding: 64px 0 32px;
  margin-top: 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand .footer-logo {
  font-family: var(--font-zh-title);
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.2em;
  margin-bottom: 8px;
}

.footer-tagline {
  font-family: var(--font-en);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--sand);
  margin-bottom: 18px;
}

.footer-mission {
  font-size: 0.88rem;
  line-height: 1.85;
  color: rgba(245, 240, 232, 0.7);
}

.footer-heading {
  font-family: var(--font-en);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--sand);
  margin-bottom: 16px;
}

.footer-list {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 10px;
}

.footer-list a {
  color: rgba(245, 240, 232, 0.78);
  font-size: 0.9rem;
  line-height: 1.6;
  transition: color 0.2s ease;
}
.footer-list a:hover { color: var(--accent-light); }

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid rgba(245, 240, 232, 0.08);
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  font-size: 0.82rem;
  color: rgba(245, 240, 232, 0.5);
  letter-spacing: 0.06em;
}

.footer-bottom-dot { opacity: 0.4; }

/* ── Responsive ─────────────────────────────────────── */
@media (min-width: 880px) {
  .nav-links { display: flex; }
  .menu-icon { display: none; }
  .mobile-menu { display: none !important; }
}

@media (max-width: 720px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
  .footer-brand { grid-column: 1 / -1; }
  .subpage-hero { padding: 138px 0 48px; }
  .subpage-body { padding: 56px 0 72px; }
  .prose { font-size: 0.98rem; }
}

@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .steps li { grid-template-columns: 44px 1fr; gap: 14px; padding: 18px 18px; }
  .steps .step-num { width: 38px; height: 38px; font-size: 1rem; }
}