/**
 * Web UI 增强样式
 * 目标：更美观、更灵动
 * 仅改动 Web 层，不改 PHP
 */

/* ========== CSS 变量 ========== */
:root {
  --ui-transition-fast: 0.2s ease;
  --ui-transition-normal: 0.3s ease;
  --ui-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --ui-shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --ui-shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
  --ui-radius-sm: 8px;
  --ui-radius-md: 12px;
  --ui-radius-lg: 16px;
}

/* ========== 全局过渡 ========== */
a, button, .btn, .nav-link, .card, .list-group-item-action,
.form-control, .form-select, .dropdown-item, .page-link {
  transition: color var(--ui-transition-fast),
              background-color var(--ui-transition-fast),
              border-color var(--ui-transition-fast),
              box-shadow var(--ui-transition-fast),
              transform var(--ui-transition-fast),
              opacity var(--ui-transition-fast);
}

/* ========== 按钮增强 ========== */
.btn {
  border-radius: var(--ui-radius-sm);
  font-weight: 500;
}

.btn-primary {
  background: linear-gradient(135deg, #0d6efd 0%, #0b5ed7 100%);
  border: none;
  box-shadow: var(--ui-shadow-sm);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #0b5ed7 0%, #0a58ca 100%);
  transform: translateY(-2px);
  box-shadow: var(--ui-shadow-md);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-outline-primary:hover {
  transform: translateY(-1px);
  box-shadow: var(--ui-shadow-sm);
}

.btn-outline-light:hover {
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(255, 255, 255, 0.2);
}

.btn-success {
  background: linear-gradient(135deg, #198754 0%, #157347 100%);
  border: none;
  box-shadow: var(--ui-shadow-sm);
}

.btn-success:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: var(--ui-shadow-md);
}

.btn-lg {
  border-radius: var(--ui-radius-sm);
}

/* ========== 卡片增强 ========== */
.card {
  border-radius: var(--ui-radius-md);
  border: 1px solid rgba(0, 0, 0, 0.06);
  box-shadow: var(--ui-shadow-sm);
  overflow: hidden;
}

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

.card-header {
  border-radius: var(--ui-radius-md) var(--ui-radius-md) 0 0;
}

.card-header.bg-primary {
  background: linear-gradient(135deg, #0d6efd 0%, #0b5ed7 100%) !important;
  border: none;
}

/* ========== 导航栏增强 ========== */
.navbar {
  background: linear-gradient(135deg, #0d6efd 0%, #0b5ed7 50%, #0a58ca 100%) !important;
  box-shadow: 0 4px 12px rgba(13, 110, 253, 0.25);
}

.navbar-logo,
.navbar-brand img {
  transition: transform var(--ui-transition-normal);
}

.navbar-brand:hover .navbar-logo,
.navbar-brand:hover img {
  transform: scale(1.05);
}

.nav-link {
  border-radius: var(--ui-radius-sm);
  padding: 0.5rem 0.75rem !important;
}

.nav-link:hover {
  background: rgba(255, 255, 255, 0.15);
}

.navbar .dropdown-menu {
  border-radius: var(--ui-radius-sm);
  box-shadow: var(--ui-shadow-lg);
  border: 1px solid rgba(0, 0, 0, 0.06);
}

.dropdown-item:hover {
  background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.dropdown-item:active {
  background: #e9ecef;
}

/* 通知铃铛 */
#notification-bell i {
  transition: transform var(--ui-transition-fast);
}

#notification-bell:hover i {
  transform: rotate(15deg);
}

/* ========== 表单增强 ========== */
.form-control, .form-select {
  border-radius: var(--ui-radius-sm);
  transition: box-shadow var(--ui-transition-fast), border-color var(--ui-transition-fast);
}

.form-control:focus, .form-select:focus {
  box-shadow: 0 0 0 3px rgba(13, 110, 253, 0.2);
}

/* ========== 首页列表卡片 ========== */
.topic-list-card .card-body {
  overflow: hidden;
}

.topic-list-header {
  background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%) !important;
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

/* ========== 列表项 / 话题卡片 ========== */
.topic-item {
  border-radius: var(--ui-radius-sm) !important;
  transition: background-color var(--ui-transition-fast),
              box-shadow var(--ui-transition-fast),
              transform var(--ui-transition-fast);
}

.topic-item:hover {
  box-shadow: var(--ui-shadow-md) !important;
  transform: translateY(-2px);
}

.list-group-item-action:hover {
  background-color: rgba(13, 110, 253, 0.04);
}

/* 最新回复块 */
.latest-reply {
  border-radius: var(--ui-radius-sm);
  transition: transform var(--ui-transition-fast), box-shadow var(--ui-transition-fast);
}

.latest-reply:hover,
.latest-reply-link:hover .latest-reply {
  transform: translateX(4px);
  box-shadow: 2px 0 8px rgba(13, 110, 253, 0.15);
}

/* ========== 分页 ========== */
.pagination .page-link {
  border-radius: var(--ui-radius-sm) !important;
  margin: 0 2px;
}

.pagination .page-link:hover {
  transform: translateY(-1px);
  box-shadow: var(--ui-shadow-sm);
}

.pagination .page-item.active .page-link {
  box-shadow: var(--ui-shadow-sm);
}

/* ========== 徽章 ========== */
.badge {
  font-weight: 500;
  letter-spacing: 0.02em;
}

/* ========== 加载指示器 ========== */
.htmx-indicator .card {
  animation: ui-fade-in 0.2s ease;
}

@keyframes ui-fade-in {
  from { opacity: 0; transform: scale(0.96); }
  to { opacity: 1; transform: scale(1); }
}

/* ========== 头像 ========== */
.avatar-image, .avatar-wrapper .rounded-circle {
  transition: transform var(--ui-transition-fast), box-shadow var(--ui-transition-fast);
}

a:hover .avatar-image,
a:hover .avatar-wrapper .rounded-circle {
  transform: scale(1.05);
  box-shadow: var(--ui-shadow-sm);
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
  .topic-item:hover {
    transform: translateY(-1px);
  }

  .btn-primary:hover,
  .btn-success:hover:not(:disabled) {
    transform: translateY(-1px);
  }
}