/* ============================================
   Campus Circle - Default Light Theme
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
  /* Brand Colors */
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-light: #e0e7ff;
  --primary-rgb: 79, 70, 229;

  /* Backgrounds */
  --bg: #f5f7fa;
  --bg-card: #ffffff;
  --bg-input: #ffffff;
  --bg-elevated: #ffffff;
  --hover-bg: #f3f4f6;
  --active-bg: #e5e7eb;

  /* Text */
  --text: #1f2937;
  --text-secondary: #6b7280;
  --text-muted: #9ca3af;
  --text-inverse: #ffffff;

  /* Borders & Shadows */
  --border: #e5e7eb;
  --border-light: #f3f4f6;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07), 0 2px 4px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.08), 0 4px 6px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1), 0 10px 10px rgba(0, 0, 0, 0.04);

  /* Status Colors */
  --success: #10b981;
  --success-light: #d1fae5;
  --warning: #f59e0b;
  --warning-light: #fef3c7;
  --danger: #ef4444;
  --danger-light: #fee2e2;
  --info: #3b82f6;
  --info-light: #dbeafe;

  /* Layout */
  --radius: 8px;
  --radius-sm: 4px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Header & Sidebar (Admin) */
  --header-bg: #ffffff;
  --header-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  --sidebar-bg: #ffffff;
  --sidebar-width: 260px;
  --sidebar-collapsed-width: 72px;

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Fira Mono', 'Roboto Mono', monospace;
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --line-height: 1.6;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.2s ease;
  --transition-slow: 0.3s ease;

  /* Z-index layers */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-overlay: 300;
  --z-modal: 400;
  --z-toast: 500;
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--line-height);
  color: var(--text);
  background-color: var(--bg);
  min-height: 100vh;
  word-break: break-word;
  overflow-wrap: break-word;
}

::selection {
  background-color: var(--primary);
  color: var(--text-inverse);
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--primary-hover);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul, ol {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  outline: none;
}

table {
  border-collapse: collapse;
  width: 100%;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.3;
  font-weight: 600;
  color: var(--text);
}

h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }
h5 { font-size: var(--text-base); }
h6 { font-size: var(--text-sm); }

p {
  margin-bottom: var(--spacing-md);
}

p:last-child {
  margin-bottom: 0;
}

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: var(--spacing-lg) 0;
}

/* --- Layout --- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.container-sm {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.container-lg {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  background-color: var(--header-bg);
  box-shadow: var(--header-shadow);
  height: 64px;
  display: flex;
  align-items: center;
  padding: 0 var(--spacing-lg);
  transition: background-color var(--transition-base), box-shadow var(--transition-base);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: 100%;
  padding: 0;
}

.header-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--primary);
}

.header-logo img {
  height: 32px;
  width: auto;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.header-nav a {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  font-weight: 500;
  padding: var(--spacing-sm) var(--spacing-xs);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.header-nav a:hover,
.header-nav a.active {
  color: var(--primary);
  background-color: var(--primary-light);
}

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

.main-content {
  margin-top: 64px;
  min-height: calc(100vh - 64px);
  padding: var(--spacing-lg) 0;
}

.main-content.with-sidebar {
  margin-left: var(--sidebar-width);
  transition: margin-left var(--transition-slow);
}

.card {
  background-color: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: var(--spacing-lg);
  border: 1px solid var(--border-light);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card-lift:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--border-light);
}

.card-title {
  font-size: var(--text-lg);
  font-weight: 600;
}

.card-body {
  flex: 1;
}

.card-footer {
  margin-top: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border-light);
}

/* Grid System */
.grid {
  display: grid;
  gap: var(--spacing-lg);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.grid-auto {
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

/* Flex Utilities */
.flex {
  display: flex;
}

.flex-col {
  display: flex;
  flex-direction: column;
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.flex-start {
  display: flex;
  align-items: center;
  justify-content: flex-start;
}

.flex-end {
  display: flex;
  align-items: center;
  justify-content: flex-end;
}

.flex-wrap {
  flex-wrap: wrap;
}

.flex-1 {
  flex: 1;
}

.gap-xs { gap: var(--spacing-xs); }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }
.gap-xl { gap: var(--spacing-xl); }

/* Section */
.section {
  padding: var(--spacing-2xl) 0;
}

.section-header {
  margin-bottom: var(--spacing-xl);
}

.section-title {
  font-size: var(--text-2xl);
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.section-desc {
  color: var(--text-secondary);
  font-size: var(--text-sm);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 10px 20px;
  font-size: var(--text-sm);
  font-weight: 500;
  line-height: 1;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  user-select: none;
  position: relative;
  overflow: hidden;
}

.btn:active {
  transform: scale(0.97);
}

.btn:disabled,
.btn.disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.btn-primary {
  background-color: var(--primary);
  color: var(--text-inverse);
  border-color: var(--primary);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  border-color: var(--primary-hover);
  box-shadow: 0 2px 8px rgba(var(--primary-rgb), 0.35);
}

.btn-primary:active {
  background-color: #3730a3;
}

.btn-secondary {
  background-color: var(--bg-card);
  color: var(--text);
  border-color: var(--border);
}

.btn-secondary:hover {
  background-color: var(--hover-bg);
  border-color: var(--text-muted);
}

.btn-danger {
  background-color: var(--danger);
  color: var(--text-inverse);
  border-color: var(--danger);
}

.btn-danger:hover {
  background-color: #dc2626;
  border-color: #dc2626;
  box-shadow: 0 2px 8px rgba(239, 68, 68, 0.35);
}

.btn-success {
  background-color: var(--success);
  color: var(--text-inverse);
  border-color: var(--success);
}

.btn-success:hover {
  background-color: #059669;
  border-color: #059669;
}

.btn-ghost {
  background-color: transparent;
  color: var(--text-secondary);
  border-color: transparent;
}

.btn-ghost:hover {
  background-color: var(--hover-bg);
  color: var(--text);
}

.btn-outline {
  background-color: transparent;
  color: var(--primary);
  border-color: var(--primary);
}

.btn-outline:hover {
  background-color: var(--primary);
  color: var(--text-inverse);
}

.btn-sm {
  padding: 6px 12px;
  font-size: var(--text-xs);
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 14px 28px;
  font-size: var(--text-base);
  border-radius: var(--radius-lg);
}

.btn-xl {
  padding: 18px 36px;
  font-size: var(--text-lg);
  border-radius: var(--radius-lg);
}

.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: var(--radius);
}

.btn-icon.btn-sm {
  width: 32px;
  height: 32px;
}

.btn-icon.btn-lg {
  width: 48px;
  height: 48px;
}

.btn-block {
  display: flex;
  width: 100%;
}

.btn-group {
  display: inline-flex;
}

.btn-group .btn {
  border-radius: 0;
}

.btn-group .btn:first-child {
  border-radius: var(--radius) 0 0 var(--radius);
}

.btn-group .btn:last-child {
  border-radius: 0 var(--radius) var(--radius) 0;
}

.btn-group .btn + .btn {
  margin-left: -1px;
}

/* --- Forms --- */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text);
  margin-bottom: var(--spacing-sm);
}

.form-hint {
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-top: var(--spacing-xs);
}

.form-error {
  font-size: var(--text-xs);
  color: var(--danger);
  margin-top: var(--spacing-xs);
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="url"],
input[type="search"],
input[type="tel"],
input[type="date"],
textarea,
select {
  width: 100%;
  padding: 10px 14px;
  font-size: var(--text-sm);
  line-height: 1.5;
  color: var(--text);
  background-color: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
}

input:focus,
textarea:focus,
select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.15);
  background-color: var(--bg-card);
}

input::placeholder,
textarea::placeholder {
  color: var(--text-muted);
}

input:disabled,
textarea:disabled,
select:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  background-color: var(--hover-bg);
}

input.error,
textarea.error,
select.error {
  border-color: var(--danger);
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15);
}

textarea {
  resize: vertical;
  min-height: 100px;
}

select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236b7280' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

.checkbox-group,
.radio-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.checkbox-label,
.radio-label {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  cursor: pointer;
  font-size: var(--text-sm);
}

input[type="checkbox"],
input[type="radio"] {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
  cursor: pointer;
}

.form-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-md);
}

/* --- Badge --- */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 10px;
  font-size: var(--text-xs);
  font-weight: 500;
  line-height: 1.6;
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.badge-primary {
  background-color: var(--primary-light);
  color: var(--primary);
}

.badge-success {
  background-color: var(--success-light);
  color: var(--success);
}

.badge-warning {
  background-color: var(--warning-light);
  color: #92400e;
}

.badge-danger {
  background-color: var(--danger-light);
  color: var(--danger);
}

.badge-info {
  background-color: var(--info-light);
  color: var(--info);
}

.badge-gray {
  background-color: var(--hover-bg);
  color: var(--text-secondary);
}

.badge-dot::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  margin-right: 6px;
  background-color: currentColor;
}

/* --- Avatar --- */
.avatar {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  overflow: hidden;
  background-color: var(--primary-light);
  color: var(--primary);
  font-weight: 600;
  flex-shrink: 0;
}

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

.avatar-xs { width: 24px; height: 24px; font-size: 10px; }
.avatar-sm { width: 32px; height: 32px; font-size: 12px; }
.avatar-md { width: 40px; height: 40px; font-size: 14px; }
.avatar-lg { width: 56px; height: 56px; font-size: 18px; }
.avatar-xl { width: 72px; height: 72px; font-size: 24px; }
.avatar-2xl { width: 96px; height: 96px; font-size: 32px; }

.avatar-group {
  display: flex;
}

.avatar-group .avatar {
  border: 2px solid var(--bg-card);
  margin-left: -8px;
}

.avatar-group .avatar:first-child {
  margin-left: 0;
}

/* --- Modal --- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-lg);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-slow), visibility var(--transition-slow);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background-color: var(--bg-card);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  width: 100%;
  max-width: 520px;
  max-height: 90vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transform: translateY(20px) scale(0.95);
  transition: transform var(--transition-slow);
}

.modal-overlay.active .modal {
  transform: translateY(0) scale(1);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--border-light);
}

.modal-title {
  font-size: var(--text-lg);
  font-weight: 600;
}

.modal-close {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  color: var(--text-muted);
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background-color: var(--hover-bg);
  color: var(--text);
}

.modal-body {
  padding: var(--spacing-lg);
  overflow-y: auto;
  flex: 1;
}

.modal-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--spacing-sm);
  padding: var(--spacing-lg);
  border-top: 1px solid var(--border-light);
}

.modal-sm { max-width: 400px; }
.modal-lg { max-width: 720px; }
.modal-xl { max-width: 960px; }

/* --- Toast / Notification --- */
.toast-container {
  position: fixed;
  top: 80px;
  right: var(--spacing-lg);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  padding: var(--spacing-md) var(--spacing-lg);
  background-color: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  border-left: 4px solid var(--primary);
  min-width: 300px;
  max-width: 420px;
  pointer-events: auto;
  animation: slideInRight 0.3s ease;
}

.toast.toast-success { border-left-color: var(--success); }
.toast.toast-warning { border-left-color: var(--warning); }
.toast.toast-danger { border-left-color: var(--danger); }
.toast.toast-info { border-left-color: var(--info); }

.toast-icon {
  font-size: var(--text-lg);
  flex-shrink: 0;
  margin-top: 1px;
}

.toast-content {
  flex: 1;
}

.toast-title {
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: 2px;
}

.toast-message {
  font-size: var(--text-xs);
  color: var(--text-secondary);
}

.toast-close {
  color: var(--text-muted);
  cursor: pointer;
  flex-shrink: 0;
  transition: color var(--transition-fast);
}

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

.toast-exit {
  animation: slideOutRight 0.3s ease forwards;
}

/* --- Dropdown --- */
.dropdown {
  position: relative;
  display: inline-flex;
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  min-width: 180px;
  background-color: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-light);
  z-index: var(--z-dropdown);
  padding: var(--spacing-xs);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition-fast);
}

.dropdown-menu.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 8px 12px;
  font-size: var(--text-sm);
  color: var(--text);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color var(--transition-fast);
  white-space: nowrap;
}

.dropdown-item:hover {
  background-color: var(--hover-bg);
}

.dropdown-item.danger {
  color: var(--danger);
}

.dropdown-item.danger:hover {
  background-color: var(--danger-light);
}

.dropdown-divider {
  height: 1px;
  background-color: var(--border-light);
  margin: var(--spacing-xs) 0;
}

/* --- Tabs --- */
.tabs {
  display: flex;
  border-bottom: 2px solid var(--border-light);
  gap: 0;
  overflow-x: auto;
}

.tab {
  padding: 12px 20px;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

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

.tab.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.tab-content {
  display: none;
  padding: var(--spacing-lg) 0;
  animation: fadeIn 0.3s ease;
}

.tab-content.active {
  display: block;
}

/* --- Pagination --- */
.pagination {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  justify-content: center;
  margin-top: var(--spacing-xl);
}

.pagination-item {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  height: 36px;
  padding: 0 8px;
  font-size: var(--text-sm);
  color: var(--text-secondary);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
}

.pagination-item:hover {
  background-color: var(--hover-bg);
  color: var(--primary);
}

.pagination-item.active {
  background-color: var(--primary);
  color: var(--text-inverse);
  border-color: var(--primary);
}

.pagination-item.disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.pagination-item.disabled:hover {
  background-color: transparent;
  color: var(--text-secondary);
}

/* --- Search Bar --- */
.search-bar {
  position: relative;
  display: flex;
  align-items: center;
}

.search-bar input {
  padding-left: 40px;
  border-radius: var(--radius-full);
  background-color: var(--hover-bg);
  border-color: transparent;
}

.search-bar input:focus {
  background-color: var(--bg-input);
  border-color: var(--primary);
  border-radius: var(--radius);
}

.search-bar-icon {
  position: absolute;
  left: 14px;
  color: var(--text-muted);
  pointer-events: none;
  display: flex;
}

.search-bar .btn {
  position: absolute;
  right: 4px;
}

/* --- Carousel / Slider --- */
.carousel {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
}

.carousel-track {
  display: flex;
  transition: transform 0.5s ease;
}

.carousel-slide {
  min-width: 100%;
  flex-shrink: 0;
}

.carousel-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.carousel-dots {
  display: flex;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
}

.carousel-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.5);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.carousel-dot.active {
  background-color: #ffffff;
  width: 24px;
  border-radius: 4px;
}

.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.9);
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-md);
  z-index: 2;
}

.carousel-btn:hover {
  background-color: #ffffff;
  box-shadow: var(--shadow-lg);
}

.carousel-btn-prev { left: var(--spacing-md); }
.carousel-btn-next { right: var(--spacing-md); }

/* --- Comment Thread --- */
.comment-thread {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.comment-item {
  display: flex;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  border-radius: var(--radius);
  transition: background-color var(--transition-fast);
}

.comment-item:hover {
  background-color: var(--hover-bg);
}

.comment-avatar {
  flex-shrink: 0;
}

.comment-body {
  flex: 1;
  min-width: 0;
}

.comment-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-xs);
}

.comment-author {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text);
}

.comment-time {
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.comment-text {
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--text);
}

.comment-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-top: var(--spacing-sm);
}

.comment-action {
  font-size: var(--text-xs);
  color: var(--text-muted);
  cursor: pointer;
  transition: color var(--transition-fast);
}

.comment-action:hover {
  color: var(--primary);
}

.comment-replies {
  margin-left: 48px;
  padding-left: var(--spacing-md);
  border-left: 2px solid var(--border-light);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

/* --- Notification Item --- */
.notification-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.notification-item:hover {
  background-color: var(--hover-bg);
}

.notification-item.unread {
  background-color: var(--primary-light);
}

.notification-item.unread:hover {
  background-color: #c7d2fe;
}

.notification-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: var(--text-sm);
}

.notification-icon.like { background-color: var(--danger-light); color: var(--danger); }
.notification-icon.comment { background-color: var(--info-light); color: var(--info); }
.notification-icon.follow { background-color: var(--success-light); color: var(--success); }
.notification-icon.system { background-color: var(--warning-light); color: #92400e; }

.notification-content {
  flex: 1;
  min-width: 0;
}

.notification-text {
  font-size: var(--text-sm);
  line-height: 1.5;
}

.notification-text strong {
  font-weight: 600;
}

.notification-time {
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-top: 2px;
}

.notification-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--primary);
  flex-shrink: 0;
  margin-top: 6px;
}

/* --- Stat Card (Dashboard) --- */
.stat-card {
  background-color: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow);
  border: 1px solid var(--border-light);
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  transition: all var(--transition-base);
}

.stat-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.stat-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xl);
  flex-shrink: 0;
}

.stat-icon.primary { background-color: var(--primary-light); color: var(--primary); }
.stat-icon.success { background-color: var(--success-light); color: var(--success); }
.stat-icon.warning { background-color: var(--warning-light); color: #92400e; }
.stat-icon.danger { background-color: var(--danger-light); color: var(--danger); }
.stat-icon.info { background-color: var(--info-light); color: var(--info); }

.stat-info {
  flex: 1;
}

.stat-label {
  font-size: var(--text-xs);
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}

.stat-value {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--text);
  line-height: 1.2;
}

.stat-change {
  font-size: var(--text-xs);
  margin-top: 4px;
  display: flex;
  align-items: center;
  gap: 4px;
}

.stat-change.up { color: var(--success); }
.stat-change.down { color: var(--danger); }

/* --- Empty State --- */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-2xl);
  text-align: center;
}

.empty-state-icon {
  font-size: 48px;
  color: var(--text-muted);
  margin-bottom: var(--spacing-md);
  opacity: 0.5;
}

.empty-state-title {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text);
  margin-bottom: var(--spacing-sm);
}

.empty-state-desc {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  max-width: 400px;
  margin-bottom: var(--spacing-lg);
}

/* --- Skeleton Loading --- */
.skeleton {
  background: linear-gradient(90deg, var(--hover-bg) 25%, var(--border-light) 50%, var(--hover-bg) 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s ease infinite;
  border-radius: var(--radius-sm);
}

.skeleton-text {
  height: 14px;
  margin-bottom: 8px;
  width: 100%;
}

.skeleton-text:last-child {
  width: 60%;
}

.skeleton-title {
  height: 20px;
  width: 50%;
  margin-bottom: 12px;
}

.skeleton-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
}

.skeleton-image {
  width: 100%;
  height: 200px;
  border-radius: var(--radius);
}

.skeleton-card {
  height: 200px;
  border-radius: var(--radius-lg);
}

/* --- Animations --- */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeOut {
  from { opacity: 1; }
  to { opacity: 0; }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(100%);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideOutRight {
  from {
    opacity: 1;
    transform: translateX(0);
  }
  to {
    opacity: 0;
    transform: translateX(100%);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes skeleton-loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}

.animate-fadeIn { animation: fadeIn 0.3s ease; }
.animate-slideUp { animation: slideUp 0.3s ease; }
.animate-slideDown { animation: slideDown 0.3s ease; }
.animate-scaleIn { animation: scaleIn 0.3s ease; }
.animate-spin { animation: spin 1s linear infinite; }
.animate-pulse { animation: pulse 2s ease infinite; }

/* --- Specific Page Styles --- */

/* Homepage */
.home-hero {
  background: linear-gradient(135deg, var(--primary) 0%, #7c3aed 100%);
  color: var(--text-inverse);
  padding: var(--spacing-2xl) 0;
  border-radius: var(--radius-xl);
  margin-bottom: var(--spacing-xl);
  overflow: hidden;
  position: relative;
}

.home-hero-content {
  position: relative;
  z-index: 1;
  padding: var(--spacing-xl) var(--spacing-2xl);
}

.home-hero h1 {
  color: var(--text-inverse);
  font-size: 2rem;
  margin-bottom: var(--spacing-md);
}

.home-hero p {
  opacity: 0.9;
  font-size: var(--text-lg);
  max-width: 600px;
}

.home-carousel {
  margin-bottom: var(--spacing-xl);
}

.circle-card {
  background-color: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  border: 1px solid var(--border-light);
  overflow: hidden;
  transition: all var(--transition-base);
}

.circle-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
}

.circle-card-cover {
  height: 120px;
  background: linear-gradient(135deg, var(--primary-light) 0%, #c4b5fd 100%);
  position: relative;
}

.circle-card-avatar {
  position: absolute;
  bottom: -24px;
  left: var(--spacing-md);
  width: 48px;
  height: 48px;
  border-radius: var(--radius);
  border: 3px solid var(--bg-card);
  overflow: hidden;
  background-color: var(--bg-card);
}

.circle-card-body {
  padding: var(--spacing-md);
  padding-top: 28px;
}

.circle-card-name {
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: 4px;
}

.circle-card-desc {
  font-size: var(--text-xs);
  color: var(--text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.circle-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-sm) var(--spacing-md);
  border-top: 1px solid var(--border-light);
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.feed-item {
  display: flex;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--border-light);
  transition: background-color var(--transition-fast);
}

.feed-item:hover {
  background-color: var(--hover-bg);
}

.feed-item:last-child {
  border-bottom: none;
}

.feed-item-content {
  flex: 1;
  min-width: 0;
}

.feed-item-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.feed-item-author {
  font-weight: 600;
  font-size: var(--text-sm);
}

.feed-item-circle {
  font-size: var(--text-xs);
  color: var(--primary);
}

.feed-item-time {
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-left: auto;
}

.feed-item-text {
  font-size: var(--text-sm);
  line-height: 1.6;
  margin-bottom: var(--spacing-sm);
}

.feed-item-images {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.feed-item-image {
  aspect-ratio: 1;
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  transition: opacity var(--transition-fast);
}

.feed-item-image:hover {
  opacity: 0.9;
}

.feed-item-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.feed-item-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.feed-action {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: var(--text-xs);
  color: var(--text-muted);
  cursor: pointer;
  transition: color var(--transition-fast);
}

.feed-action:hover {
  color: var(--primary);
}

.feed-action.active {
  color: var(--danger);
}

/* Circle Page */
.circle-banner {
  height: 200px;
  background: linear-gradient(135deg, var(--primary) 0%, #7c3aed 100%);
  border-radius: var(--radius-xl);
  position: relative;
  overflow: hidden;
  margin-bottom: 60px;
}

.circle-banner-avatar {
  position: absolute;
  bottom: -36px;
  left: var(--spacing-xl);
  width: 72px;
  height: 72px;
  border-radius: var(--radius-lg);
  border: 4px solid var(--bg-card);
  overflow: hidden;
  background-color: var(--bg-card);
}

.circle-info {
  margin-bottom: var(--spacing-xl);
}

.circle-info-name {
  font-size: var(--text-2xl);
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.circle-info-desc {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
}

.circle-info-stats {
  display: flex;
  gap: var(--spacing-lg);
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.circle-info-stats strong {
  color: var(--text);
  font-weight: 600;
}

.member-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.member-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-full);
  background-color: var(--hover-bg);
  font-size: var(--text-sm);
  transition: background-color var(--transition-fast);
}

.member-item:hover {
  background-color: var(--border);
}

.post-list {
  display: flex;
  flex-direction: column;
}

.post-item {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--border-light);
  transition: background-color var(--transition-fast);
}

.post-item:hover {
  background-color: var(--hover-bg);
}

.post-item-title {
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.post-item-title a {
  color: var(--text);
}

.post-item-title a:hover {
  color: var(--primary);
}

.post-item-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  font-size: var(--text-xs);
  color: var(--text-muted);
}

/* Post Page */
.post-content {
  max-width: 800px;
  margin: 0 auto;
}

.post-header {
  margin-bottom: var(--spacing-xl);
}

.post-title {
  font-size: var(--text-2xl);
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  line-height: 1.4;
}

.post-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.post-body {
  font-size: var(--text-base);
  line-height: 1.8;
  margin-bottom: var(--spacing-xl);
}

.post-body p {
  margin-bottom: var(--spacing-md);
}

.post-body img {
  border-radius: var(--radius);
  margin: var(--spacing-md) 0;
}

.post-body h2 {
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
}

.post-body blockquote {
  border-left: 4px solid var(--primary);
  padding: var(--spacing-md) var(--spacing-lg);
  margin: var(--spacing-lg) 0;
  background-color: var(--primary-light);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--text-secondary);
}

.post-body code {
  font-family: var(--font-mono);
  background-color: var(--hover-bg);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-size: 0.9em;
}

.post-body pre {
  background-color: #1e293b;
  color: #e2e8f0;
  padding: var(--spacing-lg);
  border-radius: var(--radius);
  overflow-x: auto;
  margin: var(--spacing-lg) 0;
}

.post-body pre code {
  background-color: transparent;
  padding: 0;
  color: inherit;
}

.post-actions-bar {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  padding: var(--spacing-md) 0;
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
  margin-bottom: var(--spacing-xl);
}

/* Profile Page */
.profile-header {
  text-align: center;
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.profile-avatar {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  margin: 0 auto var(--spacing-md);
  border: 4px solid var(--primary-light);
  overflow: hidden;
}

.profile-name {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
}

.profile-bio {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  max-width: 400px;
  margin: 0 auto var(--spacing-md);
}

.profile-stats {
  display: flex;
  justify-content: center;
  gap: var(--spacing-xl);
}

.profile-stat {
  text-align: center;
}

.profile-stat-value {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--text);
}

.profile-stat-label {
  font-size: var(--text-xs);
  color: var(--text-secondary);
}

.profile-info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: var(--spacing-md);
}

.profile-info-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  border-radius: var(--radius);
  background-color: var(--hover-bg);
}

.profile-info-label {
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.profile-info-value {
  font-size: var(--text-sm);
  font-weight: 500;
}

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

.admin-sidebar {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  width: var(--sidebar-width);
  background-color: var(--sidebar-bg);
  border-right: 1px solid var(--border);
  z-index: var(--z-sticky);
  display: flex;
  flex-direction: column;
  transition: width var(--transition-slow), transform var(--transition-slow);
  overflow: hidden;
}

.admin-sidebar.collapsed {
  width: var(--sidebar-collapsed-width);
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) var(--spacing-lg);
  height: 64px;
  border-bottom: 1px solid var(--border-light);
  flex-shrink: 0;
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 700;
  font-size: var(--text-lg);
  color: var(--primary);
  white-space: nowrap;
  overflow: hidden;
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-md);
}

.sidebar-section {
  margin-bottom: var(--spacing-lg);
}

.sidebar-section-title {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  padding: var(--spacing-sm) var(--spacing-md);
  white-space: nowrap;
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: 10px var(--spacing-md);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  border-radius: var(--radius);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.sidebar-link:hover {
  background-color: var(--hover-bg);
  color: var(--text);
}

.sidebar-link.active {
  background-color: var(--primary-light);
  color: var(--primary);
  font-weight: 500;
}

.sidebar-link-icon {
  width: 20px;
  text-align: center;
  flex-shrink: 0;
}

.sidebar-footer {
  padding: var(--spacing-md);
  border-top: 1px solid var(--border-light);
  flex-shrink: 0;
}

.admin-main {
  flex: 1;
  margin-left: var(--sidebar-width);
  transition: margin-left var(--transition-slow);
}

.admin-sidebar.collapsed ~ .admin-main {
  margin-left: var(--sidebar-collapsed-width);
}

.admin-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background-color: var(--header-bg);
  border-bottom: 1px solid var(--border);
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--spacing-lg);
}

.admin-content {
  padding: var(--spacing-lg);
}

.admin-dashboard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

/* Data Tables */
.data-table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  background-color: var(--bg-card);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
}

.data-table th {
  background-color: var(--hover-bg);
  padding: 12px 16px;
  text-align: left;
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  white-space: nowrap;
  border-bottom: 1px solid var(--border);
}

.data-table td {
  padding: 12px 16px;
  font-size: var(--text-sm);
  border-bottom: 1px solid var(--border-light);
  vertical-align: middle;
}

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

.data-table tr:hover td {
  background-color: var(--hover-bg);
}

.data-table-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

/* --- Utility Classes --- */
.text-primary { color: var(--primary); }
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-danger { color: var(--danger); }
.text-muted { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.text-sm { font-size: var(--text-sm); }
.text-xs { font-size: var(--text-xs); }
.text-lg { font-size: var(--text-lg); }
.text-xl { font-size: var(--text-xl); }
.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.font-medium { font-weight: 500; }

.bg-primary { background-color: var(--primary); }
.bg-primary-light { background-color: var(--primary-light); }
.bg-success-light { background-color: var(--success-light); }
.bg-warning-light { background-color: var(--warning-light); }
.bg-danger-light { background-color: var(--danger-light); }

.rounded { border-radius: var(--radius); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-full { border-radius: var(--radius-full); }

.shadow { box-shadow: var(--shadow); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }

.overflow-hidden { overflow: hidden; }
.overflow-auto { overflow: auto; }
.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.line-clamp-2 {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.line-clamp-3 {
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.mt-0 { margin-top: 0; }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }
.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }
.ml-auto { margin-left: auto; }
.mr-auto { margin-right: auto; }

.p-0 { padding: 0; }
.p-sm { padding: var(--spacing-sm); }
.p-md { padding: var(--spacing-md); }
.p-lg { padding: var(--spacing-lg); }
.p-xl { padding: var(--spacing-xl); }

.w-full { width: 100%; }
.h-full { height: 100%; }
.min-h-screen { min-height: 100vh; }

.relative { position: relative; }
.absolute { position: absolute; }
.sticky { position: sticky; }

.hidden { display: none; }
.visible { display: block; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.cursor-pointer { cursor: pointer; }
.pointer-events-none { pointer-events: none; }

.opacity-0 { opacity: 0; }
.opacity-50 { opacity: 0.5; }
.opacity-75 { opacity: 0.75; }

/* --- Responsive --- */

/* Mobile: up to 480px */
@media (max-width: 480px) {
  :root {
    --spacing-lg: 16px;
    --spacing-xl: 24px;
    --spacing-2xl: 32px;
  }

  .container {
    padding: 0 var(--spacing-sm);
  }

  .header {
    padding: 0 var(--spacing-md);
  }

  .header-nav {
    display: none;
  }

  .header-nav.mobile-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background-color: var(--header-bg);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-md);
    border-bottom: 1px solid var(--border);
  }

  .hamburger {
    display: flex;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .grid-auto {
    grid-template-columns: 1fr;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .card {
    padding: var(--spacing-md);
    border-radius: var(--radius);
  }

  .modal {
    max-width: 100%;
    border-radius: var(--radius-lg);
    margin: var(--spacing-sm);
  }

  .toast {
    min-width: unset;
    max-width: calc(100vw - 32px);
  }

  .toast-container {
    right: var(--spacing-sm);
    left: var(--spacing-sm);
  }

  .home-hero h1 {
    font-size: 1.5rem;
  }

  .home-hero p {
    font-size: var(--text-sm);
  }

  .circle-banner {
    height: 120px;
    margin-bottom: 40px;
  }

  .circle-banner-avatar {
    width: 48px;
    height: 48px;
    bottom: -24px;
  }

  .profile-stats {
    gap: var(--spacing-md);
  }

  .admin-sidebar {
    transform: translateX(-100%);
    width: 260px;
  }

  .admin-sidebar.mobile-open {
    transform: translateX(0);
  }

  .admin-main {
    margin-left: 0;
  }

  .admin-dashboard-grid {
    grid-template-columns: 1fr;
  }

  .post-title {
    font-size: var(--text-xl);
  }

  .comment-replies {
    margin-left: 24px;
  }

  .pagination {
    flex-wrap: wrap;
  }
}

/* Tablet: 481px - 768px */
@media (min-width: 481px) and (max-width: 768px) {
  .hamburger {
    display: flex;
  }

  .header-nav {
    display: none;
  }

  .header-nav.mobile-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background-color: var(--header-bg);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-md);
    border-bottom: 1px solid var(--border);
  }

  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-auto {
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  }

  .admin-sidebar {
    transform: translateX(-100%);
  }

  .admin-sidebar.mobile-open {
    transform: translateX(0);
  }

  .admin-main {
    margin-left: 0;
  }

  .admin-dashboard-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Desktop small: 769px - 1024px */
@media (min-width: 769px) and (max-width: 1024px) {
  .hamburger {
    display: none;
  }

  .grid-4 {
    grid-template-columns: repeat(3, 1fr);
  }

  .admin-sidebar {
    width: 220px;
  }

  .admin-main {
    margin-left: 220px;
  }
}

/* Desktop: 1025px+ */
@media (min-width: 1025px) {
  .hamburger {
    display: none;
  }
}

/* Hamburger button (hidden on desktop) */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: var(--spacing-sm);
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--text);
  border-radius: 1px;
  transition: all var(--transition-fast);
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile sidebar overlay */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: calc(var(--z-sticky) - 1);
}

.sidebar-overlay.active {
  display: block;
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background-color: var(--border);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background-color: var(--text-muted);
}

/* Print styles */
@media print {
  .header,
  .admin-sidebar,
  .hamburger,
  .btn,
  .toast-container {
    display: none !important;
  }

  .main-content {
    margin-top: 0;
  }

  .admin-main {
    margin-left: 0;
  }

  body {
    background: white;
    color: black;
  }

  .card {
    box-shadow: none;
    border: 1px solid #ddd;
  }
}