/* 液态玻璃磨砂白效果样式 */
:root {
  /* 液态玻璃基础变量 */
  --glass-bg: rgba(255, 255, 255, 0.65);
  --glass-bg-hover: rgba(255, 255, 255, 0.75);
  --glass-border: rgba(255, 255, 255, 0.5);
  --glass-shadow: 0 8px 32px rgba(31, 38, 135, 0.15);
  --glass-shadow-hover: 0 12px 48px rgba(31, 38, 135, 0.25);
  --glass-blur: blur(16px);
  --glass-radius: 20px;
  
  /* 渐变背景 */
  --bg-gradient-1: #667eea;
  --bg-gradient-2: #764ba2;
  --bg-gradient-3: #f093fb;
  --bg-gradient-4: #4facfe;
  --bg-gradient-5: #00f2fe;
  
  /* 文字颜色 */
  --text-primary: #2d3748;
  --text-secondary: #4a5568;
  --text-accent: #5a67d8;
  
  /* 强调色 */
  --accent-blue: #4299e1;
  --accent-purple: #9f7aea;
  --accent-pink: #ed64a6;
  --accent-green: #48bb78;
  --accent-yellow: #ecc94b;
  --accent-cyan: #4fd1c5;
  
  /* 动画 */
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 夜晚模式变量覆盖 */
body.light-mode {
  --glass-bg: rgba(30, 30, 50, 0.65);
  --glass-bg-hover: rgba(30, 30, 50, 0.75);
  --glass-border: rgba(255, 255, 255, 0.15);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  --glass-shadow-hover: 0 12px 48px rgba(0, 0, 0, 0.4);
  
  --bg-gradient-1: #0f0c29;
  --bg-gradient-2: #302b63;
  --bg-gradient-3: #24243e;
  --bg-gradient-4: #1a1a2e;
  --bg-gradient-5: #16213e;
  
  --text-primary: #e2e8f0;
  --text-secondary: #a0aec0;
  --text-accent: #63b3ed;
  
  --accent-blue: #63b3ed;
  --accent-purple: #b794f4;
  --accent-pink: #f687b3;
  --accent-green: #68d391;
  --accent-yellow: #f6e05e;
  --accent-cyan: #4fd1c5;
}

/* 全局样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: linear-gradient(-45deg, var(--bg-gradient-1), var(--bg-gradient-2), var(--bg-gradient-3), var(--bg-gradient-4));
  background-size: 400% 400%;
  animation: gradientFlow 15s ease infinite;
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

@keyframes gradientFlow {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

/* 浮动气泡背景 */
.bubble-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}

.bubble {
  position: absolute;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.3), rgba(255, 255, 255, 0.1));
  backdrop-filter: blur(2px);
  animation: floatBubble 20s infinite ease-in-out;
}

.bubble:nth-child(1) {
  width: 200px;
  height: 200px;
  top: 10%;
  left: 10%;
  animation-delay: 0s;
}

.bubble:nth-child(2) {
  width: 150px;
  height: 150px;
  top: 60%;
  left: 80%;
  animation-delay: -5s;
}

.bubble:nth-child(3) {
  width: 180px;
  height: 180px;
  top: 40%;
  left: 50%;
  animation-delay: -10s;
}

.bubble:nth-child(4) {
  width: 120px;
  height: 120px;
  top: 80%;
  left: 20%;
  animation-delay: -15s;
}

.bubble:nth-child(5) {
  width: 160px;
  height: 160px;
  top: 20%;
  left: 70%;
  animation-delay: -8s;
}

@keyframes floatBubble {
  0%, 100% {
    transform: translateY(0) rotate(0deg);
  }
  33% {
    transform: translateY(-30px) rotate(120deg);
  }
  66% {
    transform: translateY(20px) rotate(240deg);
  }
}

/* 主容器 */
.container {
  position: relative;
  z-index: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1rem;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* 液态玻璃卡片基础样式 */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--glass-radius);
  box-shadow: var(--glass-shadow);
  transition: var(--transition-smooth);
  overflow: hidden;
  position: relative;
}

.glass-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.8), transparent);
}

.glass-card:hover {
  background: var(--glass-bg-hover);
  box-shadow: var(--glass-shadow-hover);
  transform: translateY(-5px);
}

/* 头部标题 */
.header {
  text-align: center;
  margin-bottom: 2rem;
}

.header h1 {
  font-size: 3.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: none;
  margin-bottom: 0.5rem;
  letter-spacing: -1px;
}

.header-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* 主题切换按钮 */
.theme-toggle {
  position: fixed;
  top: 1.5rem;
  right: 1.5rem;
  z-index: 100;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
  cursor: pointer;
  transition: var(--transition-smooth);
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle:hover {
  transform: rotate(180deg) scale(1.1);
  box-shadow: var(--glass-shadow-hover);
}

.theme-toggle i {
  font-size: 1.3rem;
  color: var(--text-accent);
}

/* 专用链接按钮 */
.special-link {
  display: inline-flex;
  align-items: center;
  padding: 0.75rem 1.5rem;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  color: var(--text-primary);
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition-smooth);
  box-shadow: var(--glass-shadow);
}

.special-link:hover {
  background: var(--glass-bg-hover);
  transform: translateY(-2px);
  box-shadow: var(--glass-shadow-hover);
}

.special-link i {
  margin-right: 0.5rem;
  color: var(--accent-purple);
}

/* 区块标题 */
.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  color: var(--text-primary);
}

.section-title i {
  margin-right: 0.75rem;
  font-size: 1.5rem;
}

.section-title.tools i {
  color: var(--accent-green);
}

.section-title.tutorials i {
  color: var(--accent-pink);
}

.section-title.steps i {
  color: var(--accent-blue);
}

.section-title.contact i {
  color: var(--text-secondary);
}

/* 工具卡片网格 */
.tools-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-bottom: 3rem;
}

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

/* 工具卡片 */
.tool-card {
  padding: 2rem;
}

.tool-card-header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  gap: 1rem;
}

.tool-card-title {
  font-size: 1.4rem;
  font-weight: 700;
}

.tool-card-title.latest {
  color: var(--accent-green);
}

.tool-card-title.legacy {
  color: var(--accent-yellow);
}

.tool-badges {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.badge {
  padding: 0.35rem 0.75rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-latest {
  background: rgba(72, 187, 120, 0.2);
  color: var(--accent-green);
  border: 1px solid rgba(72, 187, 120, 0.3);
}

.badge-legacy {
  background: rgba(236, 201, 75, 0.2);
  color: var(--accent-yellow);
  border: 1px solid rgba(236, 201, 75, 0.3);
}

.badge-windows {
  background: rgba(66, 153, 225, 0.2);
  color: var(--accent-blue);
  border: 1px solid rgba(66, 153, 225, 0.3);
}

.tool-card-description {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  line-height: 1.6;
  font-size: 0.95rem;
}

.tool-card-features {
  list-style: none;
  margin-bottom: 1.5rem;
}

.tool-card-features li {
  display: flex;
  align-items: flex-start;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.tool-card-features li i {
  margin-right: 0.5rem;
  margin-top: 0.2rem;
  flex-shrink: 0;
}

.tool-card-features li i.fa-check {
  color: var(--accent-green);
}

.tool-card-features li i.fa-triangle-exclamation {
  color: var(--accent-yellow);
}

/* 下载按钮 */
.download-btn {
  display: block;
  width: 100%;
  padding: 1rem;
  text-align: center;
  border-radius: 12px;
  font-weight: 700;
  text-decoration: none;
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.download-btn.latest {
  background: linear-gradient(135deg, #48bb78 0%, #38a169 100%);
  color: white;
}

.download-btn.legacy {
  background: linear-gradient(135deg, #ecc94b 0%, #d69e2e 100%);
  color: white;
}

.download-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

.download-btn::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  transform: rotate(45deg);
  transition: all 0.5s;
}

.download-btn:hover::after {
  left: 100%;
}

/* 教程网格 */
.tutorials-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-bottom: 3rem;
}

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

.tutorial-card {
  padding: 1.5rem;
}

.tutorial-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--accent-pink);
  margin-bottom: 0.75rem;
}

.tutorial-card p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  line-height: 1.6;
  font-size: 0.95rem;
}

.tutorial-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 0.875rem;
  background: linear-gradient(135deg, #ed64a6 0%, #9f7aea 100%);
  color: white;
  font-weight: 700;
  border-radius: 12px;
  text-decoration: none;
  transition: var(--transition-smooth);
}

.tutorial-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

.tutorial-btn i {
  margin-right: 0.5rem;
  font-size: 1.2rem;
}

/* 步骤区域 */
.steps-section {
  padding: 2rem;
  margin-bottom: 3rem;
}

.steps-container {
  position: relative;
}

.steps-line {
  position: absolute;
  left: 24px;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--accent-blue), var(--accent-purple), var(--accent-pink));
  border-radius: 2px;
  display: none;
}

@media (min-width: 768px) {
  .steps-line {
    display: block;
  }
}

.step-item {
  position: relative;
  margin-bottom: 2rem;
  padding-left: 0;
}

@media (min-width: 768px) {
  .step-item {
    padding-left: 60px;
  }
}

.step-dot {
  position: absolute;
  left: 0;
  top: 8px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: none;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: white;
  font-size: 1.2rem;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

@media (min-width: 768px) {
  .step-dot {
    display: flex;
  }
}

.step-dot.blue {
  background: linear-gradient(135deg, var(--accent-blue), #3182ce);
}

.step-dot.purple {
  background: linear-gradient(135deg, var(--accent-purple), #805ad5);
}

.step-dot.pink {
  background: linear-gradient(135deg, var(--accent-pink), #d53f8c);
}

.step-dot.green {
  background: linear-gradient(135deg, var(--accent-green), #38a169);
}

.step-content {
  background: rgba(255, 255, 255, 0.5);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: 16px;
  padding: 1.5rem;
  transition: var(--transition-smooth);
  color: var(--text-secondary);
}

.step-content:hover {
  background: rgba(255, 255, 255, 0.65);
  transform: translateX(5px);
}

/* 夜晚模式下的步骤内容 */
body.light-mode .step-content {
  background: rgba(30, 30, 50, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

body.light-mode .step-content:hover {
  background: rgba(30, 30, 50, 0.65);
}

.step-content h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.step-content h3.blue {
  color: var(--accent-blue);
}

.step-content h3.purple {
  color: var(--accent-purple);
}

.step-content h3.pink {
  color: var(--accent-pink);
}

.step-content h3.green {
  color: var(--accent-green);
}

.step-list {
  list-style: none;
}

.step-list li {
  display: flex;
  align-items: flex-start;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.step-list li i {
  margin-right: 0.5rem;
  margin-top: 0.15rem;
  flex-shrink: 0;
}

.step-list li i.fa-circle-check {
  color: var(--accent-blue);
}

.step-list li i.fa-triangle-exclamation {
  color: var(--accent-yellow);
}

/* 联系区域 */
.contact-section {
  padding: 2rem;
  margin-bottom: 3rem;
  text-align: center;
}

.contact-section h2 {
  margin-bottom: 1rem;
}

.contact-section p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

.contact-btn {
  display: inline-flex;
  align-items: center;
  padding: 1rem 2rem;
  background: linear-gradient(135deg, var(--accent-blue), #3182ce);
  color: white;
  font-weight: 700;
  border-radius: 12px;
  text-decoration: none;
  transition: var(--transition-smooth);
}

.contact-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

.contact-btn i {
  margin-right: 0.5rem;
  font-size: 1.2rem;
}

/* 页脚 */
.footer {
  text-align: center;
  padding: 2rem 0;
  color: rgba(255, 255, 255, 0.8);
}

.footer p {
  margin-bottom: 0.5rem;
}

.footer .copyright {
  font-size: 0.9rem;
  font-weight: 500;
}

.footer .disclaimer {
  font-size: 0.8rem;
  opacity: 0.8;
}

/* 模态框 */
.modal {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-smooth);
}

.modal.active {
  opacity: 1;
  visibility: visible;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(5px);
}

.modal-content {
  position: relative;
  width: 90%;
  max-width: 600px;
  padding: 2rem;
  z-index: 1;
}

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition-smooth);
}

.modal-close:hover {
  color: var(--text-primary);
  transform: rotate(90deg);
}

.modal-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--accent-cyan);
  margin-bottom: 1rem;
}

.modal-body {
  color: var(--text-secondary);
  line-height: 1.6;
}

.modal-confirm {
  margin-top: 1.5rem;
  padding: 0.75rem 1.5rem;
  background: linear-gradient(135deg, var(--accent-cyan), #319795);
  color: white;
  font-weight: 700;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.modal-confirm:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.2);
}

/* 响应式设计 */
@media (max-width: 640px) {
  .header h1 {
    font-size: 2.5rem;
  }
  
  .section-title {
    font-size: 1.4rem;
  }
  
  .tool-card {
    padding: 1.5rem;
  }
  
  .steps-section,
  .contact-section {
    padding: 1.5rem;
  }
}

/* 加载动画 */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-fade-in-up {
  animation: fadeInUp 0.6s ease-out forwards;
}

.animate-delay-1 {
  animation-delay: 0.1s;
  opacity: 0;
}

.animate-delay-2 {
  animation-delay: 0.2s;
  opacity: 0;
}

.animate-delay-3 {
  animation-delay: 0.3s;
  opacity: 0;
}

.animate-delay-4 {
  animation-delay: 0.4s;
  opacity: 0;
}