:root {
  --color-bg-main: #f7f9fc;
  --color-bg-page: #fff;
  --color-bg-white: #fff;
  --color-bg-soft: #f3f6fa;
  --color-card: #fff;
  --color-primary: #1976d2;
  --color-primary-dark: #0d47a1;
  --color-primary-soft: #e3f2fd;
  --color-accent: #ffb300;
  --color-danger: #e53935;
  --color-success: #2e7d32;
  --color-text-main: #1f2937;
  --color-text-secondary: #374151;
  --color-text-muted: #6b7280;
  --color-border: #e5e7eb;
  --color-price: #e53935;
  --color-accent-dark: var(--color-primary-dark);
  --color-accent-soft: var(--color-primary-soft);
  --color-card-shadow: rgba(15, 23, 42, .06);
  --radius-card: 18px;
  --radius-button: 12px;
  --radius-lg: 24px;
  --radius-md: 18px;
  --shadow-card: 0 8px 24px var(--color-card-shadow);
  --shadow-soft: 0 8px 24px rgba(15, 23, 42, .05);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--color-text-main);
  background: var(--color-bg-main);
  font-family: "Noto Sans TC", "Microsoft JhengHei", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

a { color: inherit; text-decoration: none; }
a:hover { color: var(--color-accent); }
img { max-width: 100%; }

.preline { white-space: pre-line; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  border-bottom: 1px solid var(--color-border);
  background: rgba(255, 255, 255, .94);
  backdrop-filter: blur(16px);
}

.site-nav {
  display: flex;
  min-height: 72px;
  align-items: center;
  gap: 22px;
}

.site-brand {
  display: grid;
  grid-template-columns: auto auto;
  align-items: center;
  gap: 2px 10px;
  min-width: max-content;
  color: var(--color-text-main);
  font-weight: 900;
}

.site-brand-logo {
  grid-row: span 2;
  width: auto;
  max-width: 158px;
  height: 46px;
  object-fit: contain;
}

.site-brand small {
  color: var(--color-text-muted);
  font-size: .72rem;
  font-weight: 600;
}

.site-nav-collapse {
  display: flex;
  flex: 1;
  align-items: center;
  gap: 18px;
}

.site-nav-links {
  display: flex;
  flex: 1;
  align-items: center;
  justify-content: center;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav-links a {
  display: block;
  border-radius: 999px;
  color: var(--color-text-secondary);
  padding: 9px 11px;
  font-size: .92rem;
  font-weight: 700;
  white-space: nowrap;
}

.site-nav-links a:hover {
  color: var(--color-accent-dark);
  background: var(--color-accent-soft);
}

.site-menu-toggle {
  display: none;
  margin-left: auto;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  background: #fff;
  padding: 9px;
}

.site-menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  margin: 4px 0;
  background: var(--color-text-main);
}

.nav-search {
  display: flex;
  align-items: center;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: #fff;
  padding: 4px 8px 4px 14px;
}

.nav-search input {
  width: 140px;
  border: 0;
  outline: 0;
  color: var(--color-text-main);
  background: transparent;
  font-size: .9rem;
}

.nav-search button {
  display: grid;
  width: 32px;
  height: 32px;
  place-items: center;
  border: 0;
  border-radius: 50%;
  color: #fff;
  background: var(--color-primary);
}

.site-nav-collapse .navbar-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.account-link,
.account-register {
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  border-radius: 999px;
  padding: 8px 12px !important;
  font-size: .88rem;
  font-weight: 800;
}

.account-link {
  color: var(--color-text-secondary) !important;
}

.account-register {
  border: 1px solid var(--color-primary) !important;
  color: #fff !important;
  background: var(--color-primary) !important;
}

.btn-primary-soft,
.btn-neon {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid var(--color-primary);
  border-radius: 12px;
  color: #fff !important;
  background: var(--color-primary);
  padding: 10px 18px;
  font-weight: 800;
  box-shadow: 0 10px 22px rgba(25, 118, 210, .18);
}

.btn-primary-soft:hover,
.btn-neon:hover {
  border-color: var(--color-primary-dark);
  color: #fff !important;
  background: var(--color-primary-dark);
}

.btn-outline-soft,
.btn-ghost {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  color: var(--color-text-secondary) !important;
  background: #fff;
  padding: 10px 18px;
  font-weight: 800;
}

.btn-outline-soft:hover,
.btn-ghost:hover {
  border-color: rgba(14, 165, 233, .35);
  color: var(--color-accent-dark) !important;
  background: var(--color-accent-soft);
}

.site-footer {
  margin-top: 80px;
  border-top: 1px solid var(--color-border);
  background: #fff;
}

.site-footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 42px;
  padding: 48px 0 28px;
}

.site-footer section {
  display: flex;
  flex-direction: column;
  gap: 10px;
  color: var(--color-text-muted);
}

.site-footer strong {
  color: var(--color-text-main);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--color-text-main);
  font-size: 1.1rem;
  font-weight: 900;
}

.footer-brand img {
  height: 38px;
  width: auto;
}

.site-footer-bottom {
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  padding: 18px 0 28px;
  font-size: .9rem;
}

.content-empty {
  border: 1px dashed #cbd5e1;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  background: #fff;
  padding: 34px;
  text-align: center;
}

.form-error,
.forum-form-error,
.admin-auth-error {
  border-radius: 12px;
  color: #b91c1c;
  background: #fef2f2;
  padding: 10px 12px;
}

.form-error:empty,
.forum-form-error:empty,
.admin-auth-error:empty { display: none; }

.form-success {
  border-radius: 12px;
  color: #047857;
  background: #ecfdf5;
  padding: 10px 12px;
}

input, select, textarea {
  border: 1px solid var(--color-border);
  border-radius: 12px;
  color: var(--color-text-main);
  background: #fff;
  padding: 12px 14px;
}

input:focus, select:focus, textarea:focus {
  outline: 3px solid rgba(14, 165, 233, .16);
  border-color: var(--color-accent);
}

@media (max-width: 1199px) {
  .site-menu-toggle { display: block; }
  .site-nav { flex-wrap: wrap; }
  .site-nav-collapse {
    flex-basis: 100%;
    flex-direction: column;
    align-items: stretch;
    padding: 0 0 18px;
  }
  .site-nav-collapse:not(.show) { display: none; }
  .site-nav-links {
    flex-direction: column;
    align-items: stretch;
  }
  .site-nav-links a { border-radius: 12px; }
  .nav-search input { width: 100%; }
}

@media (max-width: 768px) {
  .site-brand-logo { height: 34px; }
  .site-footer-grid { grid-template-columns: 1fr; }
}