/**
 * 禪閱 ZenRead — Shared Components CSS
 * Navigation, sidebar, footer, shared layout
 */

/* ─── Top Navigation Bar ─── */
.top-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
  height: 72px;
  display: flex;
  align-items: center;
  background-color: rgba(249,248,246,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-light);
  transition: transform var(--transition-normal), background-color var(--transition-slow);
}

.dark .top-nav {
  background-color: rgba(17,33,32,0.92);
}

.top-nav.hidden-nav {
  transform: translateY(-100%);
}

.nav-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--color-text);
  transition: color var(--transition-fast);
  text-decoration: none;
}

.nav-logo:hover {
  color: var(--color-primary);
}

.nav-logo-zh {
  font-size: 16px;
  font-weight: 500;
  letter-spacing: 0.15em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
  text-decoration: none;
  position: relative;
  padding: 4px 0;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-text);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: var(--radius-full);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.nav-icon-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.nav-icon-btn:hover {
  background-color: var(--color-surface-2);
  color: var(--color-text);
}

.nav-avatar {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  border: 1.5px solid var(--color-border);
  overflow: hidden;
  cursor: pointer;
  transition: border-color var(--transition-fast);
}

.nav-avatar:hover {
  border-color: var(--color-primary);
}

.nav-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ─── Search overlay ─── */
.search-overlay {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  background-color: rgba(249,248,246,0.96);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding-top: 120px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.dark .search-overlay {
  background-color: rgba(17,33,32,0.96);
}

.search-overlay.active {
  opacity: 1;
  pointer-events: all;
}

.search-input-wrap {
  width: 100%;
  max-width: 600px;
  padding: 0 var(--space-xl);
  position: relative;
}

.search-input {
  width: 100%;
  font-family: var(--font-ui);
  font-size: 24px;
  font-weight: 300;
  color: var(--color-text);
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-md) 0;
  outline: none;
  caret-color: var(--color-primary);
}

.search-input::placeholder {
  color: var(--color-text-muted);
}

.search-close {
  position: absolute;
  top: 50%;
  right: var(--space-xl);
  transform: translateY(-50%);
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.search-close:hover { color: var(--color-text); }

/* ─── Admin Sidebar ─── */
.admin-sidebar {
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  width: 240px;
  background-color: var(--color-surface);
  border-right: 1px solid var(--color-border-light);
  display: flex;
  flex-direction: column;
  padding: var(--space-2xl) 0;
  z-index: var(--z-sticky);
  transition: background-color var(--transition-slow);
}

.dark .admin-sidebar {
  background-color: var(--color-dark-surface);
}

.sidebar-logo {
  padding: 0 var(--space-xl);
  margin-bottom: var(--space-2xl);
}

.sidebar-logo h1 {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--color-text);
}

.sidebar-logo p {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-text-muted);
  margin-top: 2px;
}

.sidebar-nav {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 0 var(--space-sm);
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: 10px var(--space-md);
  border-radius: var(--radius-lg);
  border-left: 2px solid transparent;
  color: var(--color-text-muted);
  font-size: 14px;
  font-weight: 500;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.sidebar-link:hover {
  color: var(--color-text);
  background-color: rgba(0,0,0,0.04);
}

.dark .sidebar-link:hover {
  background-color: rgba(255,255,255,0.06);
}

.sidebar-link.active {
  color: var(--color-primary);
  background-color: var(--color-primary-ultra);
  border-left-color: var(--color-primary);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
}

.sidebar-footer {
  padding: var(--space-xl);
  margin-top: auto;
  border-top: 1px solid var(--color-border-light);
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.sidebar-user-avatar {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background-color: var(--color-border);
  overflow: hidden;
  flex-shrink: 0;
}

.sidebar-user-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.sidebar-user-info { flex: 1; min-width: 0; }
.sidebar-user-name {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-user-plan {
  font-size: 11px;
  color: var(--color-text-muted);
}

/* ─── Admin layout ─── */
.admin-layout {
  display: flex;
  min-height: 100vh;
}

.admin-main {
  margin-left: 240px;
  flex: 1;
  padding: var(--space-3xl) var(--space-3xl);
  max-width: calc(1280px);
  min-height: 100vh;
}

.page-header {
  margin-bottom: var(--space-3xl);
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: var(--space-lg);
}

.page-title {
  font-size: 28px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--color-text);
}

.page-subtitle {
  font-size: 14px;
  color: var(--color-text-muted);
  margin-top: var(--space-xs);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 12px;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

.breadcrumb a:hover { color: var(--color-text); }

/* ─── Stats Card ─── */
.stat-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  position: relative;
  overflow: hidden;
  transition: box-shadow var(--transition-normal);
}

.stat-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  height: 2px;
  width: 0;
  background-color: var(--color-primary);
  transition: width var(--transition-slow);
}

.stat-card:hover::after {
  width: 100%;
}

.stat-label {
  font-size: 13px;
  color: var(--color-text-muted);
  font-weight: 500;
  margin-bottom: var(--space-sm);
}

.stat-value {
  font-size: 32px;
  font-weight: 700;
  font-family: var(--font-content);
  color: var(--color-text);
  line-height: 1;
}

.stat-badge {
  display: inline-block;
  margin-left: var(--space-sm);
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

/* ─── Table ─── */
.zen-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.zen-table thead tr {
  background-color: var(--color-surface-2);
  border-bottom: 1px solid var(--color-border-light);
}

.zen-table th {
  padding: var(--space-md) var(--space-xl);
  text-align: left;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  white-space: nowrap;
}

.zen-table td {
  padding: var(--space-md) var(--space-xl);
  border-bottom: 1px solid var(--color-border-light);
  vertical-align: middle;
}

.zen-table tbody tr {
  transition: background-color var(--transition-fast);
}

.zen-table tbody tr:hover {
  background-color: rgba(123,140,124,0.03);
}

.zen-table tbody tr:last-child td {
  border-bottom: none;
}

/* ─── Footer ─── */
.site-footer {
  border-top: 1px solid var(--color-border-light);
  padding: var(--space-2xl) var(--space-xl);
  text-align: center;
  font-size: 12px;
  color: var(--color-text-muted);
  margin-top: auto;
}

.footer-shield {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  margin-bottom: var(--space-sm);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 600;
  color: var(--color-text-muted);
  opacity: 0.7;
  transition: color var(--transition-fast), opacity var(--transition-fast);
}

.footer-shield:hover {
  color: var(--color-primary);
  opacity: 1;
}

/* ─── Dark mode toggle button ─── */
.dark-mode-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.dark-mode-btn:hover {
  background-color: var(--color-surface-2);
  color: var(--color-text);
}

/* ─── Responsive ─── */
@media (max-width: 768px) {
  .admin-sidebar { display: none; }
  .admin-main { margin-left: 0; padding: var(--space-lg); }
  .nav-links { display: none; }
}

@media (max-width: 1024px) {
  .nav-inner { padding: 0 var(--space-lg); }
}