/* 兰星少年俱乐部 - 新闻页面样式 - 增强版 */
:root {
  --lanxing-blue: #1e40af;
  --lanxing-orange: #ea580c;
  --lanxing-light-blue: #dbeafe;
  --lanxing-dark-blue: #1e3a8a;
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --bg-light: #f9fafb;
  --bg-white: #ffffff;
  --border-color: #e5e7eb;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  background-color: var(--bg-light);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* Header Styles */
header {
  background: linear-gradient(135deg, var(--lanxing-blue), var(--lanxing-dark-blue));
  color: white;
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-md);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.logo {
  font-size: 1.75rem;
  font-weight: 800;
  text-decoration: none;
  color: white;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo span {
  color: var(--lanxing-orange);
}

nav ul {
  display: flex;
  list-style: none;
  gap: 1.5rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

nav a {
  color: white;
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-fast);
  padding: 0.5rem 0;
  position: relative;
}

nav a:hover {
  color: var(--lanxing-orange);
}

nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--lanxing-orange);
  transition: width var(--transition-normal);
}

nav a:hover::after {
  width: 100%;
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, var(--lanxing-light-blue), var(--lanxing-blue));
  color: white;
  padding: 4rem 0;
  text-align: center;
  margin-bottom: 3rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at center, rgba(255,255,255,0.1) 0%, transparent 70%);
}

.hero h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 1rem;
  position: relative;
  z-index: 1;
}

.hero p {
  font-size: 1.25rem;
  max-width: 700px;
  margin: 0 auto;
  opacity: 0.9;
  position: relative;
  z-index: 1;
}

/* News Grid */
.news-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
}

/* News Card */
.news-card {
  background: var(--bg-white);
  border-radius: 0.75rem;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  height: 100%;
  display: flex;
  flex-direction: column;
  position: relative;
  isolation: isolate;
}

.news-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.card-image {
  height: 200px;
  background-color: var(--bg-light);
  background-size: cover;
  background-position: center;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-weight: 600;
  position: relative;
  overflow: hidden;
}

.card-image::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.2), transparent);
}

.card-content {
  padding: 1.5rem;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.card-content h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-primary);
  line-height: 1.4;
  transition: color var(--transition-fast);
}

.news-card:hover .card-content h3 {
  color: var(--lanxing-blue);
}

.card-content p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  flex-grow: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.category-tag {
  background: var(--lanxing-orange);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
  display: inline-block;
  transition: background-color var(--transition-fast);
}

.news-card:hover .category-tag {
  background: #c2410c;
}

/* Loading and Error States */
.loading-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  padding: 3rem;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 4px solid rgba(30, 64, 175, 0.2);
  border-top: 4px solid var(--lanxing-blue);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.loading-text {
  font-size: 1.125rem;
  color: var(--text-secondary);
}

.error-container {
  text-align: center;
  padding: 2rem;
  color: #dc2626;
  background: #fee2e2;
  border-radius: 0.5rem;
  margin: 2rem 0;
}

.error-icon {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.error-message {
  font-size: 1.125rem;
  margin-bottom: 1rem;
}

.retry-button {
  background: var(--lanxing-blue);
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 0.25rem;
  cursor: pointer;
  margin-top: 1rem;
  transition: background-color var(--transition-fast);
}

.retry-button:hover {
  background: var(--lanxing-dark-blue);
}

.empty-state {
  text-align: center;
  padding: 3rem;
  color: var(--text-secondary);
}

.empty-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.empty-message {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.empty-subtext {
  color: var(--text-secondary);
  opacity: 0.8;
}

/* News Detail Page */
.news-detail {
  background: var(--bg-white);
  border-radius: 0.75rem;
  box-shadow: var(--shadow-md);
  padding: 2rem;
  margin-bottom: 3rem;
  max-width: 800px;
  margin: 2rem auto;
  position: relative;
}

.news-detail-header {
  margin-bottom: 2rem;
}

.news-detail h1 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 1rem;
  color: var(--text-primary);
  line-height: 1.3;
}

.news-detail-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
  flex-wrap: wrap;
  gap: 1rem;
}

.news-detail-meta span {
  color: var(--text-secondary);
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.news-detail-content {
  line-height: 1.8;
  color: var(--text-primary);
  margin-bottom: 2rem;
  font-size: 1.125rem;
}

.news-detail-content p {
  margin-bottom: 1.5rem;
}

.news-detail-content p:last-child {
  margin-bottom: 0;
}

.news-detail-image {
  width: 100%;
  height: 300px;
  background-color: var(--bg-light);
  background-size: cover;
  background-position: center;
  margin-bottom: 2rem;
  border-radius: 0.5rem;
  position: relative;
  overflow: hidden;
}

.news-detail-image::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.2), transparent);
}

/* Comments Section */
.comments-section {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
}

.comments-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.comment-item {
  background: var(--bg-light);
  padding: 1.25rem;
  border-radius: 0.5rem;
  border-left: 4px solid var(--lanxing-blue);
}

.comment-author {
  font-weight: 600;
  color: var(--lanxing-blue);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.comment-date {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-left: auto;
}

.comment-content {
  color: var(--text-primary);
  line-height: 1.6;
}

.comments-empty {
  text-align: center;
  color: var(--text-secondary);
  padding: 2rem;
  font-style: italic;
}

/* Comment Form */
.comment-form {
  background: var(--bg-light);
  padding: 1.5rem;
  border-radius: 0.5rem;
  margin-top: 1rem;
}

.comment-form h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.form-group {
  margin-bottom: 1rem;
}

.form-label,
label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.form-input,
.form-textarea,
input,
textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 0.375rem;
  font-family: inherit;
  font-size: 1rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
input:focus,
textarea:focus {
  outline: none;
  border-color: var(--lanxing-blue);
  box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.1);
}

.form-textarea,
textarea {
  min-height: 120px;
  resize: vertical;
}

.submit-button,
button[type="submit"] {
  background: var(--lanxing-blue);
  color: white;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 0.375rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.submit-button:hover,
button[type="submit"]:hover {
  background: var(--lanxing-dark-blue);
}

.submit-button:disabled,
button[type="submit"]:disabled {
  background: #9ca3af;
  cursor: not-allowed;
}

.form-message {
  margin-top: 0.5rem;
  padding: 0.5rem;
  border-radius: 0.25rem;
}

.form-message.success {
  background: #dcfce7;
  color: #166534;
}

.form-message.error {
  background: #fee2e2;
  color: #dc2626;
}

/* Back to News Button */
.back-button {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--lanxing-blue);
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  text-decoration: none;
  font-weight: 600;
  transition: background-color var(--transition-fast), transform var(--transition-fast);
  margin-bottom: 2rem;
}

.back-button:hover {
  background: var(--lanxing-dark-blue);
  transform: translateX(-2px);
}

/* Footer */
.footer {
  background-color: #1f2937;
  color: white;
  padding: 2rem 0;
  margin-top: auto;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  text-align: center;
}

/* Accessibility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Focus styles for accessibility */
*:focus-visible {
  outline: 2px solid var(--lanxing-orange);
  outline-offset: 2px;
}

/* Responsive Design - Mobile First */
@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.75rem;
  }
  
  .hero p {
    font-size: 1rem;
    padding: 0 1rem;
  }
  
  .news-grid {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }
  
  .card-image {
    height: 160px;
  }
  
  .card-content h3 {
    font-size: 1.125rem;
  }
  
  .news-detail {
    margin: 1rem;
    padding: 1.25rem;
  }
  
  .news-detail h1 {
    font-size: 1.5rem;
  }
  
  .news-detail-image {
    height: 200px;
  }
  
  .back-button {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
  }
  
  .comments-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
  
  .comment-date {
    margin-left: 0;
  }
}

@media (min-width: 481px) and (max-width: 768px) {
  .hero h1 {
    font-size: 2rem;
  }
  
  .hero p {
    font-size: 1.125rem;
  }
  
  .news-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .header-content {
    flex-direction: column;
    gap: 1rem;
  }
  
  nav ul {
    gap: 1rem;
    justify-content: center;
  }
  
  .card-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }
  
  .news-detail h1 {
    font-size: 1.75rem;
  }
  
  .news-detail-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .hero h1 {
    font-size: 2.25rem;
  }
  
  .news-grid {
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.75rem;
  }
  
  .card-image {
    height: 180px;
  }
}

@media (min-width: 1025px) {
  .hero h1 {
    font-size: 2.5rem;
  }
  
  .news-grid {
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
  }
  
  .card-image {
    height: 200px;
  }
}

/* Print styles */
@media print {
  header, .hero, .back-button, footer, .comments-section, .comment-form {
    display: none;
  }
  
  body {
    background: white;
    color: black;
  }
  
  .news-detail {
    box-shadow: none;
    margin: 0;
    padding: 0;
    max-width: none;
  }
  
  .news-detail-image {
    height: auto;
    max-height: 300px;
  }
}