/* PTTused 全站基礎樣式 */
* { box-sizing: border-box; }

:root {
  --color-primary:       #3b82f6;
  --color-primary-dark:  #1d4ed8;
  --color-primary-light: #60a5fa;
  --color-accent:        #8b5cf6;
  --color-success:       #16a34a;
  --color-warning:       #d97706;
  --color-danger:        #dc2626;
  --color-neutral:       #6b7280;

  --color-bg:         #f6f8fc;
  --color-bg-2:       #eef1f7;
  --color-surface:    #ffffff;
  --color-border:     #e2e7f0;
  --color-border-soft: rgba(12,19,34,.07);
  --color-text:       #0c1322;
  --color-text-muted: #5b667e;
  --color-text-faint: #8a94a8;

  --radius-sm:  8px;
  --radius-md:  12px;
  --radius-lg:  18px;
  --radius-xl:  24px;
  --radius-pill: 999px;

  --shadow-sm: 0 1px 3px rgba(12,19,34,.07), 0 1px 2px rgba(12,19,34,.04);
  --shadow-md: 0 4px 14px rgba(12,19,34,.08), 0 2px 6px rgba(12,19,34,.05);
  --shadow-lg: 0 12px 32px rgba(12,19,34,.12), 0 4px 10px rgba(12,19,34,.06);
  --shadow-focus: 0 0 0 3px rgba(59,130,246,.26);

  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Noto Sans TC", "PingFang TC", system-ui, sans-serif;
  --font-mono: "SF Mono", "Cascadia Code", ui-monospace, monospace;
}

[data-theme="dark"] {
  --color-bg:         #0f172a;
  --color-bg-2:       #1a1f35;
  --color-surface:    #1e293b;
  --color-border:     rgba(255,255,255,.1);
  --color-text:       #f1f5f9;
  --color-text-muted: #94a3b8;
  --color-text-faint: #64748b;
}

html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  min-height: 100vh;
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: inherit; }

.skeleton {
  background: linear-gradient(90deg, #e2e8f0 25%, #f1f5f9 50%, #e2e8f0 75%);
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.4s infinite;
  border-radius: var(--radius-md);
}
@keyframes skeleton-shimmer {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  padding: .65rem 1rem;
}
.navbar-brand {
  color: var(--color-text) !important;
  font-weight: 900;
  font-size: 1.16rem;
  letter-spacing: -.01em;
  text-decoration: none;
}
.navbar-brand::first-letter { color: var(--color-primary); }
.nav-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  font-size: .86rem;
  font-weight: 650;
  text-decoration: none;
  border: 1.5px solid var(--color-border);
  color: #3f4b67;
  background: #fff;
  transition: border-color .15s ease-out, color .15s ease-out, background .15s ease-out, transform .15s ease-out;
  margin-right: 6px;
  white-space: nowrap;
}
.nav-btn:hover  { border-color: var(--color-primary); color: var(--color-primary); background: #eef5ff; }
.nav-btn.active { border-color: var(--color-primary); background: var(--color-primary); color: #fff; }
.nav-btn:active { transform: translateY(1px); }

.nav-dropdown { position: relative; display: inline-block; }
.nav-dropdown-menu {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  min-width: 160px;
  z-index: 1000;
  padding: 6px;
}
.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown-menu.open { display: block; }
.nav-dropdown-item {
  display: block;
  padding: 9px 12px;
  border-radius: 9px;
  font-size: .86rem;
  color: #374151;
  text-decoration: none;
  transition: background .12s ease-out, color .12s ease-out;
  white-space: nowrap;
}
.nav-dropdown-item:hover  { background: #eef5ff; color: var(--color-primary); }
.nav-dropdown-item.active { color: var(--color-primary); font-weight: 800; }

.spinner-wrap { display: none; text-align: center; padding: 3rem; }
#noResult { display: none; }

:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus);
}

@media (max-width: 768px) {
  .navbar { align-items: flex-start !important; gap: 8px; }
  .navbar .ms-auto { width: 100%; justify-content: flex-start; overflow-x: auto; padding-bottom: 2px; }
  .nav-btn { margin-right: 4px; }
}
.ptt-brand {
  display: inline-flex !important;
  align-items: center;
  gap: 8px;
  color: var(--color-text) !important;
  letter-spacing: -.02em;
}
.brand-av {
  width: 30px;
  height: 30px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 9px;
  background: radial-gradient(120% 120% at 30% 18%, #5b9bff 0%, #3b82f6 55%, #1d4ed8 100%);
  box-shadow: 0 8px 18px rgba(59,130,246,.26);
  flex: 0 0 auto;
}
.brand-av svg {
  width: 22px;
  height: 22px;
  display: block;
}
.brand-word {
  display: inline-block;
  color: var(--color-text);
  font-weight: 900;
}
.brand-word span { color: var(--color-primary); }
.nav-danger {
  border-color: #fecaca !important;
  color: #dc2626 !important;
}
.nav-danger:hover {
  border-color: #dc2626 !important;
  color: #fff !important;
  background: #dc2626 !important;
}
@media (max-width: 520px) {
  .brand-word { font-size: 1.05rem; }
  .brand-av { width: 28px; height: 28px; }
  .brand-av svg { width: 20px; height: 20px; }
}