/* ============================================
   组件样式 - 按钮、卡片、输入框等
   ============================================ */

/* ============================================
   Header 导航栏
   ============================================ */

.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition: all var(--transition-base) var(--ease-smooth);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) var(--spacing-lg);
  max-width: 1440px;
  margin: 0 auto;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
  transition: opacity var(--transition-base) var(--ease-smooth);
}

.logo:hover {
  opacity: 0.8;
}

.logo-icon {
  font-size: 1.5rem;
}

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

.nav-links {
  display: flex;
  gap: var(--spacing-lg);
  list-style: none;
}

.nav-link {
  color: var(--color-text-secondary);
  font-weight: 500;
  transition: color var(--transition-base) var(--ease-smooth);
}

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

.nav-link.active {
  color: var(--color-primary);
}

/* ============================================
   按钮
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 12px 24px;
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast) var(--ease-smooth);
  text-decoration: none;
  font-family: inherit;
  text-transform: uppercase;
  position: relative;
  overflow: hidden;
}

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

/* 主按钮 - 黑底白字 */
.btn-primary {
  background: var(--color-text);
  color: var(--color-bg);
  border-color: var(--color-text);
}

.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transform: translateX(-100%);
  transition: transform 0.6s;
}

.btn-primary:hover:not(:disabled)::before {
  transform: translateX(100%);
}

.btn-primary:hover:not(:disabled) {
  background: var(--color-primary-hover);
  box-shadow: 0 0 0 1px var(--color-text), 0 0 20px rgba(0, 0, 0, 0.3);
  transform: translateY(-1px);
}

/* 次要按钮 - 白底黑字黑边框 */
.btn-secondary {
  background: var(--color-bg);
  color: var(--color-text);
  border: 1px solid var(--color-border-strong);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--color-text);
  color: var(--color-bg);
  border-color: var(--color-text);
  transform: translateY(-1px);
}

/* 描边按钮 */
.btn-outline {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-text);
}

.btn-outline:hover:not(:disabled) {
  background: var(--color-text);
  color: var(--color-bg);
  transform: translateY(-1px);
}

/* 文字按钮 */
.btn-text {
  background: transparent;
  color: var(--color-text-secondary);
  padding: var(--spacing-sm);
  border: none;
}

.btn-text:hover:not(:disabled) {
  color: var(--color-text);
  background: var(--color-bg-secondary);
}

/* 按钮尺寸 */
.btn-sm {
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: 0.875rem;
}

.btn-lg {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: 1.125rem;
}

/* 图标按钮 */
.btn-icon {
  padding: var(--spacing-sm);
  width: 40px;
  height: 40px;
  border: 1px solid var(--color-border);
}

/* 主题切换按钮 */
.theme-toggle {
  width: 40px;
  height: 40px;
  background: var(--color-bg);
  border: 1px solid var(--color-border-strong);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-base) var(--ease-smooth);
  font-size: 1.125rem;
}

.theme-toggle:hover {
  background: var(--color-text);
  color: var(--color-bg);
  border-color: var(--color-text);
  transform: scale(1.05);
}

/* ============================================
   输入框
   ============================================ */

.input-group {
  position: relative;
  width: 100%;
}

.input {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 1rem;
  font-family: inherit;
  background: var(--color-bg);
  border: 1px solid var(--color-border-strong);
  color: var(--color-text);
  transition: all var(--transition-base) var(--ease-smooth);
}

.input:focus {
  outline: none;
  border-color: var(--color-text);
  background: var(--color-bg-secondary);
  box-shadow: 0 0 0 1px var(--color-text);
}

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

.input-icon {
  position: absolute;
  left: var(--spacing-md);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-tertiary);
  pointer-events: none;
}

.input-with-icon {
  padding-left: var(--spacing-4xl);
}

/* 搜索框 */
.search-box {
  position: relative;
  max-width: 600px;
  width: 100%;
  flex: 1;
}

.search-input {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-4xl) var(--spacing-sm) var(--spacing-4xl);
  font-size: 1rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border-strong);
  color: var(--color-text);
  transition: all var(--transition-base) var(--ease-smooth);
  height: 44px;
}

.search-input:focus {
  outline: none;
  border-color: var(--color-text);
  box-shadow: 0 0 0 2px rgba(0, 0, 0, 0.05);
  background: var(--color-bg-secondary);
}

.search-icon {
  position: absolute;
  left: var(--spacing-md);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text);
  font-size: 1.125rem;
}

.search-shortcut {
  position: absolute;
  right: var(--spacing-md);
  top: 50%;
  transform: translateY(-50%);
  padding: 2px 8px;
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  font-size: 0.75rem;
  color: var(--color-text-tertiary);
  font-family: monospace;
}

/* ============================================
   卡片
   ============================================ */

.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base) var(--ease-smooth);
  position: relative;
}

.card::before {
  content: '';
  position: absolute;
  inset: -1px;
  border: 1px solid var(--color-text);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.card:hover {
  box-shadow: 0 0 0 1px var(--color-text);
  transform: translateY(-2px);
}

.card:hover::before {
  opacity: 1;
}

.card-clickable {
  cursor: pointer;
}

/* Prompt 卡片 */
.prompt-card {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  height: 100%;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast) var(--ease-smooth);
  cursor: pointer;
  position: relative;
}

.prompt-card::after {
  content: '';
  position: absolute;
  inset: -1px;
  border: 1px solid var(--color-text);
  opacity: 0;
  transition: opacity var(--transition-fast);
  pointer-events: none;
}

.prompt-card:hover {
  box-shadow: 0 0 0 1px var(--color-text);
  transform: translateY(-2px);
}

.prompt-card:hover::after {
  opacity: 1;
}

.prompt-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-sm);
}

.prompt-card-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.prompt-card-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--spacing-xs);
}

.prompt-card-description {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex-grow: 1;
}

.prompt-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-sm);
  padding-top: var(--spacing-sm);
  border-top: 1px solid var(--color-border);
}

.prompt-card-tags {
  display: flex;
  gap: var(--spacing-xs);
  flex-wrap: wrap;
}

.prompt-card-time {
  font-size: 0.75rem;
  color: var(--color-text-tertiary);
  white-space: nowrap;
}

/* ============================================
   徽章和标签
   ============================================ */

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: 4px 8px;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  white-space: nowrap;
  border: 1px solid var(--color-border-strong);
  background: var(--color-bg);
  color: var(--color-text);
}

.badge-category {
  background: var(--color-text);
  color: var(--color-bg);
  border-color: var(--color-text);
}

.badge-difficulty-初级,
.badge-difficulty-中级,
.badge-difficulty-高级 {
  background: var(--color-bg);
  color: var(--color-text);
  border: 1px solid var(--color-border-strong);
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  font-size: 0.75rem;
  font-weight: 500;
  background: var(--color-bg);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  transition: all var(--transition-fast) var(--ease-smooth);
  cursor: pointer;
  user-select: none;
  letter-spacing: 0.01em;
}

.tag:hover {
  background: var(--color-text);
  border-color: var(--color-text);
  color: var(--color-bg);
  transform: translateY(-1px);
}

.tag.active {
  background: var(--color-text);
  color: var(--color-bg);
  border-color: var(--color-text);
}

/* ============================================
   弹窗
   ============================================ */

.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: var(--spacing-lg);
  overflow-y: auto;
}

.modal {
  background: var(--color-bg);
  border: 1px solid var(--color-border-strong);
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.1), 0 20px 60px rgba(0, 0, 0, 0.3);
  max-width: 800px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
}

.modal-header {
  padding: var(--spacing-xl);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
  position: sticky;
  top: 0;
  background: var(--color-bg);
  z-index: 10;
}

.modal-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
}

.modal-close {
  width: 32px;
  height: 32px;
  background: transparent;
  border: 1px solid var(--color-border);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  transition: all var(--transition-base) var(--ease-smooth);
  font-size: 1.5rem;
}

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

.modal-content {
  padding: var(--spacing-xl);
}

.modal-footer {
  padding: var(--spacing-xl);
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--spacing-md);
  position: sticky;
  bottom: 0;
  background: var(--color-bg);
}

/* ============================================
   空状态
   ============================================ */

.empty-state {
  text-align: center;
  padding: var(--spacing-4xl) var(--spacing-lg);
}

.empty-state-icon {
  font-size: 4rem;
  opacity: 0.3;
  margin-bottom: var(--spacing-md);
}

.empty-state-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
}

.empty-state-description {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
}

/* ============================================
   加载状态
   ============================================ */

.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-4xl);
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* ============================================
   CTA 区域
   ============================================ */

.cta {
  padding: 64px 0;
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
}

.cta-container {
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
  padding: 48px;
  border: 1px solid var(--color-border-strong);
}

.cta-label {
  display: inline-block;
  padding: 6px 16px;
  border: 1px solid var(--color-border-strong);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-weight: 700;
  margin-bottom: 16px;
}

.cta-title {
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin-bottom: 16px;
  line-height: 1.1;
}

.cta-description {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  margin-bottom: 32px;
  line-height: 1.8;
}

.cta .btn-primary:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 0 0 1px var(--color-text), 0 4px 12px rgba(0, 0, 0, 0.15);
}

@media (max-width: 768px) {
  .cta {
    padding: 48px 0;
  }
  
  .cta-container {
    padding: 32px 24px;
  }
  
  .cta-title {
    font-size: 2rem;
  }
  
  .cta-description {
    font-size: 1rem;
  }
}

/* ============================================
   移动端响应式
   ============================================ */

@media (max-width: 768px) {
  .header-content {
    padding: var(--spacing-sm) var(--spacing-md);
  }
  
  .nav-links {
    display: none;
  }
  
  .modal {
    max-width: 100%;
    max-height: 100vh;
    border-radius: 0;
  }
  
  .modal-header,
  .modal-content,
  .modal-footer {
    padding: var(--spacing-md);
  }
  
  .prompt-card {
    padding: var(--spacing-md);
  }
}