/* 主样式文件 */

/* 重置和基础样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-family);
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-primary);
  transition: background-color var(--transition-base), color var(--transition-base);
  overflow-x: hidden;
}

/* 滚动条样式 */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--primary-color);
  border-radius: var(--radius-full);
}

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

/* 页面加载动画 */
.page-loader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--bg-primary);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9999;
  opacity: 1;
  transition: opacity 0.5s ease-out;
}

.page-loader.hidden {
  opacity: 0;
  pointer-events: none;
}

.loader-spinner {
  width: 50px;
  height: 50px;
  border: 3px solid var(--border-color);
  border-top: 3px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* 背景装饰 */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--primary-gradient);
  opacity: 0.15;
  z-index: -1;
  pointer-events: none;
}

/* 头部样式 */
header {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: var(--space-8) var(--space-4);
  position: relative;
  background: linear-gradient(135deg, rgba(255,255,255,0.05) 0%, rgba(255,255,255,0.15) 100%), 
              url('../assets/cloud.png');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--primary-gradient);
  opacity: 0.15;
  z-index: -1;
}

header img {
  width: 180px;
  height: 180px;
  border-radius: var(--radius-full);
  object-fit: cover;
  border: 5px solid var(--bg-primary);
  box-shadow: var(--shadow-xl), 0 0 30px rgba(102, 126, 234, 0.3);
  margin-bottom: var(--space-6);
  transition: transform var(--transition-base);
  animation: float 6s ease-in-out infinite;
}

header img:hover {
  transform: scale(1.05);
}

@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-10px); }
}

header h1 {
  font-size: var(--text-5xl);
  font-weight: 700;
  margin-bottom: var(--space-4);
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
  animation: slideInUp 1s ease-out 0.3s both;
}

header p {
  font-size: var(--text-xl);
  color: var(--text-primary);
  font-weight: 500;
  margin-bottom: var(--space-8);
  max-width: 700px;
  text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.4);
  background: rgba(255, 255, 255, 0.1);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  animation: slideInUp 1s ease-out 0.5s both;
}

/* 导航样式 */
nav {
  display: flex;
  gap: var(--space-6);
  flex-wrap: wrap;
  justify-content: center;
  animation: slideInUp 1s ease-out 0.7s both;
}

nav a {
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 500;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-color);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

nav a::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: var(--primary-gradient);
  transition: left var(--transition-base);
  z-index: -1;
}

nav a:hover::before {
  left: 0;
}

nav a:hover {
  color: var(--text-inverse);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* 固定导航栏 */
.nav-fixed {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  padding: var(--space-4);
  z-index: 1000;
  transform: translateY(-100%);
  transition: transform var(--transition-base);
}

.nav-fixed.visible {
  transform: translateY(0);
}

.nav-fixed nav {
  gap: var(--space-4);
}

.nav-fixed nav a {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
}

/* 主要内容区域 */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-8) var(--space-4);
  position: relative;
}

main::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url('../assets/house.png');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  background-attachment: fixed;
  opacity: 0.25;
  z-index: -2;
  pointer-events: none;
}

/* 章节样式 */
section {
  margin-bottom: var(--space-20);
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease-out;
}

/* 个人简介段落样式 */
#about p {
  white-space: pre-line;
  line-height: 1.8;
  font-size: var(--text-lg);
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  padding: var(--space-6);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-lg);
  margin: var(--space-6) auto;
  max-width: 800px;
  position: relative;
  overflow: hidden;
  transition: all var(--transition-base);
}

#about p::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--primary-gradient);
  z-index: 1;
}

#about p:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary-color);
}

/* 表情符号样式增强 */
#about p {
  font-weight: 500;
  color: var(--text-primary);
}

/* 表情符号行首样式 */
#about p::after {
  content: '';
  position: absolute;
  top: var(--space-3);
  right: var(--space-4);
  width: 8px;
  height: 8px;
  background: var(--accent-color);
  border-radius: var(--radius-full);
  opacity: 0.6;
}

/* 响应式优化 */
@media (max-width: 767px) {
  #about p {
    padding: var(--space-4);
    margin: var(--space-4) auto;
    font-size: var(--text-base);
    max-width: 95vw;
  }
}

section.visible {
  opacity: 1;
  transform: translateY(0);
}

section h2 {
  font-size: var(--text-3xl);
  font-weight: 700;
  margin-bottom: var(--space-8);
  text-align: center;
  position: relative;
}

section h2::after {
  content: '';
  position: absolute;
  bottom: -var(--space-2);
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: var(--primary-gradient);
  border-radius: var(--radius-full);
}

/* 网格布局 */
.grid {
  display: grid;
  gap: var(--space-6);
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* 卡片样式 */
.card {
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--primary-gradient);
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.card:hover::before {
  transform: scaleX(1);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary-color);
}

/* 时间线样式 */
.timeline {
  position: relative;
  padding-left: var(--space-8);
}

.timeline::before {
  content: '';
  position: absolute;
  left: var(--space-4);
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--primary-gradient);
}

.timeline-item {
  position: relative;
  margin-bottom: var(--space-6);
}

.timeline-item::after {
  content: '';
  position: absolute;
  left: calc(-var(--space-8) + var(--space-3));
  top: var(--space-6);
  width: 12px;
  height: 12px;
  background: var(--accent-color, var(--primary-color));
  border-radius: var(--radius-full);
  border: 3px solid var(--bg-primary);
  box-shadow: var(--shadow-md);
  z-index: 1;
}

.timeline-icon {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-3);
  display: inline-block;
}

.timeline-content h3 {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-2);
  color: var(--text-primary);
}

.timeline-content p {
  color: var(--text-secondary);
  line-height: 1.6;
}

/* 技术栈网格 */
.tech-grid {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.tech-card {
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  text-align: center;
  transition: all var(--transition-base);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.tech-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--category-color, var(--primary-color));
  opacity: 0;
  transition: opacity var(--transition-base);
  z-index: -1;
}

.tech-card:hover::before {
  opacity: 0.1;
}

.tech-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--category-color, var(--primary-color));
}

.tech-icon {
  font-size: var(--text-3xl);
  margin-bottom: var(--space-3);
  display: block;
}

.tech-card h3 {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-4);
  color: var(--text-primary);
}

.tech-skills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  justify-content: center;
}

.skill-tag {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 500;
  transition: all var(--transition-base);
}

.tech-card:hover .skill-tag {
  background: var(--category-color, var(--primary-color));
  color: var(--text-inverse);
}

/* 项目卡片 */
.project-card {
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all var(--transition-base);
  cursor: pointer;
}

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.project-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  transition: transform var(--transition-base);
}

.project-card:hover img {
  transform: scale(1.05);
}

.project-card-content {
  padding: var(--space-6);
}

.project-card h3 {
  font-size: var(--text-xl);
  font-weight: 600;
  margin-bottom: var(--space-3);
  color: var(--text-primary);
}

.project-card p {
  color: var(--text-secondary);
  margin-bottom: var(--space-4);
}

.project-links {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.project-links a {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-base);
}

.project-links a:hover {
  color: var(--accent-color);
}

/* 模态框样式 */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(5px);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 2000;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

.modal.active {
  opacity: 1;
  pointer-events: all;
}

/* 图片模态框样式 */
.image-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.9);
  backdrop-filter: blur(10px);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 3000;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

.image-modal.active {
  opacity: 1;
  pointer-events: all;
}

.image-modal-content {
  position: relative;
  max-width: 90vw;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  animation: zoomIn 0.3s ease-out;
}

.image-modal-close {
  position: absolute;
  top: -50px;
  right: 0;
  background: rgba(255, 255, 255, 0.9);
  border: none;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  font-size: var(--text-xl);
  cursor: pointer;
  color: var(--text-primary);
  transition: all var(--transition-base);
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.image-modal-close:hover {
  background: rgba(255, 255, 255, 1);
  transform: scale(1.1);
}

.large-image {
  max-width: 100%;
  max-height: 85vh;
  width: auto;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  object-fit: contain;
}

.image-modal-caption {
  color: white;
  text-align: center;
  padding: var(--space-4);
  font-size: var(--text-lg);
  font-weight: 500;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
  max-width: 80vw;
}

@keyframes zoomIn {
  from {
    opacity: 0;
    transform: scale(0.5);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* 二维码模态框样式 */
.qr-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(10px);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 3000;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

.qr-modal.active {
  opacity: 1;
  pointer-events: all;
}

.qr-modal-content {
  background: var(--bg-primary);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  max-width: 500px;
  width: 90vw;
  position: relative;
  animation: slideUp 0.3s ease-out;
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--border-color);
}

.qr-modal-close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  background: var(--bg-secondary);
  border: none;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  font-size: var(--text-lg);
  cursor: pointer;
  color: var(--text-secondary);
  transition: all var(--transition-base);
  display: flex;
  align-items: center;
  justify-content: center;
}

.qr-modal-close:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  transform: scale(1.1);
}

.qr-modal-header {
  text-align: center;
  margin-bottom: var(--space-6);
}

.qr-modal-header h3 {
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.qr-modal-header p {
  color: var(--text-secondary);
  font-size: var(--text-sm);
}

.qr-modal-body {
  display: flex;
  justify-content: center;
}

.qr-code-image {
  width: 280px;
  height: 280px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  object-fit: contain;
  background: white;
  padding: var(--space-2);
  cursor: pointer;
  transition: all var(--transition-base);
}

.qr-code-image:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-lg);
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(50px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.modal-content {
  background: var(--bg-primary);
  border-radius: var(--radius-2xl);
  max-width: 90vw;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  transform: scale(0.7);
  transition: transform var(--transition-base);
  box-shadow: var(--shadow-xl);
}

.modal.active .modal-content {
  transform: scale(1);
}

.modal-header {
  padding: var(--space-6);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-close {
  background: none;
  border: none;
  font-size: var(--text-2xl);
  cursor: pointer;
  color: var(--text-secondary);
  transition: color var(--transition-base);
}

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

.modal-body {
  padding: var(--space-6);
}

.project-details h3 {
  font-size: var(--text-lg);
  font-weight: 600;
  margin: var(--space-6) 0 var(--space-3) 0;
  color: var(--text-primary);
}

.project-details h3:first-child {
  margin-top: 0;
}

.project-details p {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-4);
}

.project-details ul {
  list-style: none;
  padding: 0;
}

.project-details li {
  position: relative;
  padding-left: var(--space-6);
  margin-bottom: var(--space-2);
  color: var(--text-secondary);
}

.project-details li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--primary-color);
  font-weight: bold;
}

.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.tech-tag {
  background: var(--primary-color);
  color: var(--text-inverse);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 500;
}

.project-actions {
  display: flex;
  gap: var(--space-4);
  margin-top: var(--space-6);
  flex-wrap: wrap;
}

.btn {
  padding: var(--space-3) var(--space-6);
  border: none;
  border-radius: var(--radius-lg);
  font-weight: 500;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-base);
  cursor: pointer;
}

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

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

.btn-secondary {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--bg-tertiary);
  transform: translateY(-2px);
}

.btn-disabled {
  background: var(--bg-secondary);
  color: var(--text-secondary);
  cursor: not-allowed;
  opacity: 0.6;
}

.btn-disabled:hover {
  transform: none;
  box-shadow: none;
}

.closed-source {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  opacity: 0.7;
}

/* 外链模块样式 */
.external-links-grid {
  display: grid;
  gap: var(--space-6);
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  margin-top: var(--space-8);
}

.external-link-card {
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  cursor: pointer;
}

.external-link-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--primary-gradient);
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.external-link-card:hover::before {
  transform: scaleX(1);
}

.external-link-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary-color);
}

.external-link-avatar {
  position: relative;
  display: flex;
  align-items: center;
  margin-bottom: var(--space-4);
}

.external-link-avatar img {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-full);
  object-fit: cover;
  border: 3px solid var(--border-color);
  margin-right: var(--space-4);
  transition: all var(--transition-base);
}

.external-link-card:hover .external-link-avatar img {
  border-color: var(--primary-color);
  transform: scale(1.05);
}

.external-link-status {
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.status-pending {
  background: rgba(255, 193, 7, 0.1);
  color: #ff9800;
  border: 1px solid rgba(255, 193, 7, 0.3);
}

.status-active {
  background: rgba(76, 175, 80, 0.1);
  color: #4caf50;
  border: 1px solid rgba(76, 175, 80, 0.3);
}

.external-link-content h3 {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.external-link-title {
  font-size: var(--text-sm);
  color: var(--primary-color);
  font-weight: 600;
  margin-bottom: var(--space-3);
}

.external-link-description {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-4);
  font-size: var(--text-sm);
}

.external-link-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.external-link-tag {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-md);
  font-size: var(--text-xs);
  font-weight: 500;
  transition: all var(--transition-base);
}

.external-link-card:hover .external-link-tag {
  background: var(--primary-color);
  color: var(--text-inverse);
  transform: scale(1.05);
}

.external-link-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-3);
  border-top: 1px solid var(--border-color);
  margin-top: var(--space-4);
}

.external-link-date {
  font-size: var(--text-xs);
  color: var(--text-secondary);
  opacity: 0.8;
}

.external-link-btn {
  padding: var(--space-2) var(--space-4);
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--text-xs);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-base);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.external-link-btn-active {
  background: var(--primary-gradient);
  color: var(--text-inverse);
}

.external-link-btn-active:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.external-link-btn-disabled {
  background: var(--bg-secondary);
  color: var(--text-secondary);
  cursor: not-allowed;
  opacity: 0.6;
}

/* 响应式设计 - 外链模块 */
@media (max-width: 767px) {
  .external-links-grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }
  
  .external-link-card {
    padding: var(--space-4);
  }
  
  .external-link-avatar img {
    width: 50px;
    height: 50px;
    margin-right: var(--space-3);
  }
  
  .external-link-footer {
    flex-direction: column;
    gap: var(--space-2);
    align-items: stretch;
  }
  
  .external-link-btn {
    width: 100%;
    text-align: center;
  }
}

/* 联系方式样式 */
.contact-buttons {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  max-width: 1000px;
  margin: 0 auto;
}

.contact-btn {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-6);
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
  cursor: pointer;
  text-align: left;
  width: 100%;
  position: relative;
  overflow: hidden;
}

.contact-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: var(--primary-gradient);
  opacity: 0.1;
  transition: left var(--transition-base);
  z-index: 0;
}

.contact-btn:hover::before {
  left: 0;
}

.contact-btn:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-color);
}

.contact-btn-icon {
  font-size: var(--text-2xl);
  flex-shrink: 0;
  z-index: 1;
  position: relative;
}

.contact-btn-text {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  z-index: 1;
  position: relative;
}

.contact-btn-text strong {
  color: var(--text-primary);
  font-size: var(--text-lg);
  font-weight: 600;
}

.contact-btn-text small {
  color: var(--text-secondary);
  font-size: var(--text-sm);
}

.contact-btn-link:hover .contact-btn-icon {
  color: var(--primary-color);
}

.contact-btn-qr:hover .contact-btn-icon {
  color: var(--accent-color);
}

.contact-btn-qr::after {
  content: '📱';
  position: absolute;
  top: var(--space-2);
  right: var(--space-3);
  font-size: var(--text-sm);
  opacity: 0.6;
  z-index: 1;
}

.contact-btn-link::after {
  content: '🔗';
  position: absolute;
  top: var(--space-2);
  right: var(--space-3);
  font-size: var(--text-sm);
  opacity: 0.6;
  z-index: 1;
}

/* 页脚样式 */
footer {
  background: var(--bg-secondary);
  padding: var(--space-12) var(--space-4);
  text-align: center;
  border-top: 1px solid var(--border-color);
  margin-top: var(--space-20);
}

footer p {
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
}

/* 暗黑模式切换按钮 */
.dark-toggle {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  width: 60px;
  height: 60px;
  border-radius: var(--radius-full);
  border: none;
  background: var(--primary-gradient);
  color: var(--text-inverse);
  font-size: var(--text-xl);
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-base);
  z-index: 1000;
}

.dark-toggle:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-glow);
}

/* 业务推广冒泡框 */
.business-bubble {
  position: fixed;
  right: var(--space-6);
  top: 45%;
  transform: translateY(-50%);
  background: var(--primary-gradient);
  color: var(--text-inverse);
  padding: var(--space-4);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  max-width: 200px;
  z-index: 999;
  font-size: var(--text-sm);
  line-height: 1.5;
  font-weight: 500;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-base);
  animation: bubbleFloat 3s ease-in-out infinite;
}

.business-bubble::before {
  content: '';
  position: absolute;
  top: 50%;
  left: -8px;
  transform: translateY(-50%);
  width: 0;
  height: 0;
  border-top: 8px solid transparent;
  border-bottom: 8px solid transparent;
  border-right: 8px solid var(--primary-color);
}

.business-bubble:hover {
  transform: translateY(-50%) scale(1.05);
  box-shadow: var(--shadow-glow);
}

.business-bubble .bubble-title {
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: var(--space-2);
  display: block;
}

.business-bubble .bubble-services {
  font-size: var(--text-xs);
  opacity: 0.9;
  margin-bottom: var(--space-2);
}

.business-bubble .bubble-cta {
  font-size: var(--text-sm);
  font-weight: 600;
}

@keyframes bubbleFloat {
  0%, 100% { 
    transform: translateY(-50%) translateX(0px);
  }
  50% { 
    transform: translateY(-50%) translateX(-5px);
  }
}

/* 响应式 - 移动端隐藏业务冒泡框 */
@media (max-width: 1024px) {
  .business-bubble {
    display: none;
  }
}

/* 回到顶部按钮 */
.back-to-top {
  position: fixed;
  bottom: var(--space-6);
  left: var(--space-6);
  width: 50px;
  height: 50px;
  border-radius: var(--radius-full);
  border: none;
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  color: var(--text-primary);
  font-size: var(--text-lg);
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  opacity: 0;
  pointer-events: none;
  z-index: 1000;
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: all;
}

.back-to-top:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* 动画关键帧 */
@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

/* 响应式设计 */
@media (max-width: 767px) {
  header h1 {
    font-size: var(--text-4xl);
  }
  
  header p {
    font-size: var(--text-lg);
    max-width: 90vw;
    padding: var(--space-2) var(--space-4);
  }
  
  nav {
    gap: var(--space-3);
  }
  
  nav a {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
  }
  
  section h2 {
    font-size: var(--text-2xl);
  }
  
  .timeline {
    padding-left: var(--space-6);
  }
  
  .timeline::before {
    left: var(--space-3);
  }
  
  .timeline .card::after {
    left: calc(-var(--space-6) + var(--space-2));
  }
  
  .dark-toggle {
    bottom: var(--space-4);
    right: var(--space-4);
    width: 50px;
    height: 50px;
  }
  
  .back-to-top {
    bottom: var(--space-4);
    left: var(--space-4);
    width: 45px;
    height: 45px;
  }
}

@media (max-width: 480px) {
  main {
    padding: var(--space-6) var(--space-3);
  }
  
  .card {
    padding: var(--space-4);
  }
  
  header img {
    width: 150px;
    height: 150px;
  }
  
  .modal-content {
    max-width: 95vw;
  }
  
  .image-modal-content {
    max-width: 95vw;
    max-height: 95vh;
  }
  
  .image-modal-close {
    top: -40px;
    right: -10px;
    width: 35px;
    height: 35px;
    font-size: var(--text-lg);
  }
  
  .large-image {
    max-height: 80vh;
  }
  
  .image-modal-caption {
    font-size: var(--text-base);
    padding: var(--space-3);
  }
  
  .contact-buttons {
    grid-template-columns: 1fr;
    gap: var(--space-3);
  }
  
  .contact-btn {
    padding: var(--space-3) var(--space-4);
  }
  
  .contact-btn-text strong {
    font-size: var(--text-base);
  }
  
  .qr-modal-content {
    padding: var(--space-6);
    width: 95vw;
  }
  
  .qr-code-image {
    width: 240px;
    height: 240px;
  }
}