:root {
  --primary: #6C5CE7;
  --primary-dark: #5A4BD1;
  --primary-light: #A29BFE;
  --accent: #00CEC9;
  --accent-dark: #00B5B0;
  --bg: #F8F9FE;
  --card-bg: #FFFFFF;
  --text: #2D3436;
  --text-light: #636E72;
  --text-muted: #B2BEC3;
  --border: #E9ECF0;
  --shadow: 0 2px 16px rgba(108, 92, 231, 0.08);
  --shadow-lg: 0 8px 32px rgba(108, 92, 231, 0.15);
  --radius: 16px;
  --radius-sm: 10px;
  --radius-lg: 24px;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  outline: none;
  transition: all 0.2s ease;
}

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

/* ===== Layout ===== */
.page {
  max-width: 480px;
  margin: 0 auto;
  min-height: 100vh;
  background: var(--bg);
  position: relative;
}

.page-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.page-header h1 {
  font-size: 18px;
  font-weight: 700;
}

.page-header .back {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--bg);
  color: var(--text);
  font-size: 20px;
}

.page-content {
  padding: 16px;
  padding-bottom: 80px;
}

/* ===== Bottom Nav ===== */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 480px;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-around;
  align-items: center;
  padding: 8px 0 calc(8px + var(--safe-bottom));
  z-index: 200;
}

.bottom-nav a {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  font-size: 11px;
  color: var(--text-muted);
  padding: 4px 12px;
  border-radius: 12px;
  transition: all 0.2s;
}

.bottom-nav a .icon {
  font-size: 18px;
  line-height: 1;
  transition: all 0.25s ease;
}

.bottom-nav a.active .icon {
  font-size: 26px;
  transform: scale(1.15);
}

.bottom-nav a.active {
  color: var(--primary);
  font-weight: 700;
}

.bottom-nav a .center-btn {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  box-shadow: var(--shadow-lg);
  margin-top: -20px;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  transition: all 0.2s;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  box-shadow: var(--shadow);
}

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

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

.btn-danger {
  background: #e74c3c;
  color: white;
}

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

.btn-accent {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: white;
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--primary);
  color: var(--primary);
}

.btn-block {
  width: 100%;
}

.btn-lg {
  padding: 16px 32px;
  font-size: 17px;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ===== Cards ===== */
.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
  margin-bottom: 12px;
}

.card-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 12px;
}

/* ===== Form ===== */
.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-light);
  margin-bottom: 6px;
}

.form-input {
  width: 100%;
  padding: 14px 16px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 15px;
  background: var(--bg);
  color: var(--text);
  transition: all 0.2s;
}

.form-input:focus {
  border-color: var(--primary);
  background: white;
}

.form-textarea {
  resize: vertical;
  min-height: 80px;
}

/* ===== Waterfall ===== */
.waterfall {
  columns: 2;
  column-gap: 10px;
}

.waterfall-item {
  break-inside: avoid;
  margin-bottom: 10px;
  border-radius: var(--radius);
  overflow: hidden;
  background: white;
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: transform 0.2s;
}

.waterfall-item:active {
  transform: scale(0.98);
}

.waterfall-item .img-wrap {
  position: relative;
  overflow: hidden;
  background: #f0f0f0;
  min-height: 120px;
}

.waterfall-item .img-wrap.skeleton {
  background: linear-gradient(90deg, rgba(0,0,0,0.04) 25%, rgba(0,0,0,0.10) 37%, rgba(0,0,0,0.04) 63%);
  background-size: 400% 100%;
  animation: skeleton-loading 1.4s ease infinite;
}

.waterfall-item img {
  width: 100%;
  display: block;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.waterfall-item img.loaded,
.waterfall-item .img-wrap:not(.skeleton) img {
  opacity: 1;
}

.waterfall-item .info {
  padding: 8px 10px;
}

.waterfall-item .quote-text {
  font-size: 12px;
  color: var(--text-light);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.waterfall-item .author {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ===== Badge ===== */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
}

.badge-primary {
  background: rgba(108, 92, 231, 0.1);
  color: var(--primary);
}

.badge-accent {
  background: rgba(0, 206, 201, 0.1);
  color: var(--accent-dark);
}

.badge-warning {
  background: rgba(253, 203, 110, 0.15);
  color: #E17055;
}

.badge-success {
  background: rgba(0, 184, 148, 0.1);
  color: #00B894;
}

.badge-danger {
  background: rgba(225, 112, 85, 0.1);
  color: #E17055;
}

/* ===== Stats Grid ===== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.stat-card {
  background: white;
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
  box-shadow: var(--shadow);
}

.stat-value {
  font-size: 28px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ===== User List ===== */
.user-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}

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

.user-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-light), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 16px;
  flex-shrink: 0;
}

.user-info {
  flex: 1;
  min-width: 0;
}

.user-name {
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.user-meta {
  font-size: 12px;
  color: var(--text-muted);
}

/* ===== Tabs ===== */
.tabs {
  display: flex;
  gap: 4px;
  padding: 4px;
  background: var(--bg);
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
}

.tab {
  flex: 1;
  text-align: center;
  padding: 10px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s;
}

.tab.active {
  background: white;
  color: var(--primary);
  box-shadow: var(--shadow);
}

/* ===== Modal ===== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: none;
  align-items: flex-end;
  justify-content: center;
  z-index: 1000;
}

.modal-overlay.active {
  display: flex;
}

.modal {
  background: white;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  width: 100%;
  max-width: 480px;
  max-height: 85vh;
  overflow-y: auto;
  padding: 20px;
  animation: slideUp 0.3s ease;
}

@keyframes slideUp {
  from { transform: translateY(100%); }
  to { transform: translateY(0); }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.modal-title {
  font-size: 18px;
  font-weight: 700;
}

.modal-close {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: var(--text-muted);
}

/* ===== Toast ===== */
.toast {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: rgba(0, 0, 0, 0.8);
  color: white;
  padding: 12px 24px;
  border-radius: 12px;
  font-size: 14px;
  z-index: 2000;
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
  max-width: 300px;
  text-align: center;
}

.toast.show {
  opacity: 1;
}

/* Toast 类型化 */
.toast.toast-success { background: rgba(0, 184, 148, 0.94); }
.toast.toast-error   { background: rgba(225, 71, 89, 0.94); }
.toast.toast-info    { background: rgba(108, 92, 231, 0.94); }

/* ===== Loading ===== */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
  color: var(--text-muted);
}

.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* ===== Empty State ===== */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
}

.empty-state .emoji {
  font-size: 48px;
  margin-bottom: 12px;
}

/* ===== Category Pills ===== */
.category-pills {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 4px 0;
  -webkit-overflow-scrolling: touch;
}

.category-pills::-webkit-scrollbar {
  display: none;
}

.pill {
  flex-shrink: 0;
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  background: white;
  color: var(--text-light);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all 0.2s;
}

.pill.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

/* ===== QR Code Section ===== */
.qr-display {
  text-align: center;
  padding: 20px;
}

.qr-display img {
  width: 200px;
  height: 200px;
  border-radius: 12px;
}

/* ===== Admin Styles ===== */
.admin-page {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

.admin-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 0;
  border-bottom: 2px solid var(--border);
  margin-bottom: 24px;
}

.admin-nav {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.admin-nav a {
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  background: white;
  color: var(--text-light);
  border: 1px solid var(--border);
}

.admin-nav a.active {
  background: var(--primary);
  color: white;
}

.admin-table {
  width: 100%;
  border-collapse: collapse;
  background: white;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.admin-table th {
  background: var(--bg);
  padding: 12px 16px;
  text-align: left;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-light);
  white-space: nowrap;
}

.admin-table td {
  padding: 12px 16px;
  font-size: 14px;
  border-top: 1px solid var(--border);
}

.admin-table tr:hover {
  background: var(--bg);
}

.admin-card {
  background: white;
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  margin-bottom: 16px;
}

.admin-stats {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.toggle-switch {
  position: relative;
  width: 44px;
  height: 24px;
  display: inline-block;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  inset: 0;
  background: #ccc;
  border-radius: 12px;
  cursor: pointer;
  transition: 0.3s;
}

.toggle-slider::before {
  content: '';
  position: absolute;
  width: 20px;
  height: 20px;
  left: 2px;
  top: 2px;
  background: white;
  border-radius: 50%;
  transition: 0.3s;
}

.toggle-switch input:checked + .toggle-slider {
  background: var(--primary);
}

.toggle-switch input:checked + .toggle-slider::before {
  transform: translateX(20px);
}

/* ===== Responsive ===== */

/* ===== Ad Carousel ===== */
.ad-carousel {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 1 / 1;
  background: var(--bg);
}

.carousel-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.5s ease;
  cursor: pointer;
}

.carousel-slide.active {
  opacity: 1;
}

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

.carousel-text {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 12px 16px;
  background: linear-gradient(transparent, rgba(0,0,0,0.6));
  color: white;
  font-size: 15px;
  font-weight: 600;
}

.carousel-dots {
  position: absolute;
  bottom: 8px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 6px;
  z-index: 2;
}

.carousel-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255,255,255,0.4);
  cursor: pointer;
  transition: all 0.3s;
}

.carousel-dot.active {
  background: white;
  width: 20px;
  border-radius: 4px;
}

/* ===== Ad Slots ===== */
.ad-slot {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 2 / 1;
  cursor: pointer;
  box-shadow: var(--shadow);
  background: var(--bg);
}

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

.ad-slot-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary-light), var(--accent));
  color: white;
  font-size: 16px;
  font-weight: 700;
}

.ad-slot-label {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 8px 12px;
  background: linear-gradient(transparent, rgba(0,0,0,0.65));
  color: white;
  font-size: 13px;
  font-weight: 600;
  text-align: center;
}

/* ===== Responsive ===== */
  .waterfall {
    columns: 3;
  }
}

/* ===== 骨架屏 ===== */
.skeleton {
  background: linear-gradient(90deg, rgba(0,0,0,0.04) 25%, rgba(0,0,0,0.10) 37%, rgba(0,0,0,0.04) 63%);
  background-size: 400% 100%;
  animation: skeleton-loading 1.4s ease infinite;
  border-radius: 8px;
}
@keyframes skeleton-loading {
  0%   { background-position: 100% 50%; }
  100% { background-position: 0 50%; }
}

@media (min-width: 1024px) {
  .waterfall {
    columns: 4;
  }
}