/* ==========================================================================
   个人作品展示网站 - 主样式文件
   设计参考：Linea Calì (https://www.lineacali.it/en/)
   ========================================================================== */

/* CSS Variables - 设计系统 */
:root {
  /* 颜色系统 - 浅色主题 */
  --color-primary: #FFFFFF;           /* 主背景色 - 白色 */
  --color-secondary: #F8F8F8;        /* 次要背景色 - 浅灰 */
  --color-accent: #B8860B;           /* 强调色 - 金色 */
  --color-accent-light: #DAA520;     /* 浅金色 */
  --color-text-primary: #1a1a1a;     /* 主要文字色 - 深灰 */
  --color-text-secondary: #666666;   /* 次要文字色 - 中灰 */
  --color-text-light: #999999;       /* 浅色文字 */
  --color-border: #E5E5E5;           /* 边框色 */
  --color-shadow: rgba(0, 0, 0, 0.1); /* 阴影色 */
}

/* 暗色主题 */
[data-theme="dark"] {
  --color-primary: #0a0a0a;           /* 更深的背景色 */
  --color-secondary: #1a1a1a;        /* 次要背景色 */
  --color-accent: #D4AF37;           /* 金属金色 */
  --color-accent-light: #FFD700;     /* 亮金色 */
  --color-text-primary: #FFFFFF;     /* 纯白文字 */
  --color-text-secondary: #E0E0E0;   /* 浅灰文字 */
  --color-text-light: #B0B0B0;       /* 中灰文字 */
  --color-border: #333333;           /* 边框色 */
  --color-shadow: rgba(0, 0, 0, 0.5); /* 更深的阴影 */
  
  /* 金属质感渐变 */
  --gradient-metal: linear-gradient(135deg, #D4AF37 0%, #FFD700 25%, #B8860B 50%, #DAA520 75%, #D4AF37 100%);
  --gradient-metal-dark: linear-gradient(135deg, #B8860B 0%, #D4AF37 50%, #8B6914 100%);
}

:root {
  /* 字体系统 */
  --font-primary: 'PingFang SC', 'Helvetica Neue', 'Arial', sans-serif;
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* 字号系统 */
  --font-size-xs: 0.75rem;      /* 12px */
  --font-size-sm: 0.875rem;     /* 14px */
  --font-size-base: 1rem;       /* 16px */
  --font-size-lg: 1.125rem;     /* 18px */
  --font-size-xl: 1.25rem;      /* 20px */
  --font-size-2xl: 1.5rem;      /* 24px */
  --font-size-3xl: 2rem;        /* 32px */
  --font-size-4xl: 2.5rem;      /* 40px */
  --font-size-5xl: 3rem;        /* 48px */
  --font-size-6xl: 4rem;        /* 64px */
  
  /* 间距系统 */
  --spacing-xs: 0.5rem;         /* 8px */
  --spacing-sm: 1rem;           /* 16px */
  --spacing-md: 1.5rem;         /* 24px */
  --spacing-lg: 2rem;           /* 32px */
  --spacing-xl: 3rem;           /* 48px */
  --spacing-2xl: 4rem;          /* 64px */
  --spacing-3xl: 6rem;          /* 96px */
  
  /* 断点系统 */
  --breakpoint-sm: 640px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1280px;
  --breakpoint-2xl: 1536px;
  
  /* 动画系统 */
  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
  --transition-bounce: 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  
  /* 阴影系统 */
  --shadow-sm: 0 1px 3px var(--color-shadow);
  --shadow-base: 0 4px 12px var(--color-shadow);
  --shadow-lg: 0 8px 24px var(--color-shadow);
  
  /* 圆角系统 */
  --radius-sm: 4px;
  --radius-base: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;
}

/* 基础重置和全局样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -moz-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: var(--font-primary);
  font-weight: var(--font-weight-normal);
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition: background-color var(--transition-base), color var(--transition-base);
}

body.loaded {
  opacity: 1;
}

/* 链接样式 */
a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-base);
}

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

/* 图片样式 */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* 按钮重置 */
button {
  background: none;
  border: none;
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
}

/* 输入框样式 */
input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

/* 列表样式 */
ul, ol {
  list-style: none;
}

/* 容器样式 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--spacing-lg);
  }
}

/* ==========================================================================
   导航栏样式
   ========================================================================== */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

.nav {
  padding: var(--spacing-sm) 0;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* 品牌标识 */
.nav-brand {
  flex-shrink: 0;
}

.brand-text {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  transition: color var(--transition-base);
}

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

/* 导航菜单 */
.nav-menu {
  display: none;
  align-items: center;
  gap: var(--spacing-lg);
}

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

.nav-item {
  position: relative;
}

.nav-link {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-base);
  transition: all var(--transition-base);
  position: relative;
}

.nav-link:hover {
  color: var(--color-accent);
  background-color: rgba(184, 134, 11, 0.1);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 50%;
  width: 0;
  height: 2px;
  background-color: var(--color-accent);
  transition: all var(--transition-base);
  transform: translateX(-50%);
}

.nav-link:hover::after {
  width: 80%;
}

/* 下拉菜单 */
.dropdown {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  background-color: var(--color-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--spacing-sm);
  min-width: 160px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-base);
}

.dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-link {
  display: block;
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--transition-base);
}

.dropdown-link:hover {
  color: var(--color-accent);
  background-color: rgba(184, 134, 11, 0.1);
}

/* 导航控制按钮 */
.nav-controls {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.theme-toggle {
  padding: var(--spacing-xs);
  border-radius: var(--radius-base);
  color: var(--color-text-secondary);
  transition: all var(--transition-base);
}

.theme-toggle:hover {
  color: var(--color-accent);
  background-color: rgba(184, 134, 11, 0.1);
}

/* 移动端菜单按钮 */
.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  position: relative;
  z-index: 1001;
}

@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }
}

.hamburger {
  width: 24px;
  height: 2px;
  background-color: var(--color-text-primary);
  position: relative;
  transition: all var(--transition-base);
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  width: 24px;
  height: 2px;
  background-color: var(--color-text-primary);
  transition: all var(--transition-base);
}

.hamburger::before {
  top: -8px;
  transform: var(--before-transform, translateY(-8px));
}

.hamburger::after {
  bottom: -8px;
  transform: var(--after-transform, translateY(8px));
}

/* 移动端菜单激活状态 */
@media (max-width: 767px) {
  .nav-menu {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-xl);
    transform: translateX(-100%);
    transition: transform var(--transition-base);
    z-index: 1000;
  }
  
  .nav-menu.active {
    transform: translateX(0);
  }
  
  .nav-item {
    opacity: 0;
    transform: translateY(30px);
    transition: all var(--transition-base);
  }
  
  .nav-menu.active .nav-item {
    opacity: 1;
    transform: translateY(0);
  }
  
  .nav-menu.active .nav-item:nth-child(1) { transition-delay: 0.1s; }
  .nav-menu.active .nav-item:nth-child(2) { transition-delay: 0.2s; }
  .nav-menu.active .nav-item:nth-child(3) { transition-delay: 0.3s; }
  .nav-menu.active .nav-item:nth-child(4) { transition-delay: 0.4s; }
  .nav-menu.active .nav-item:nth-child(5) { transition-delay: 0.5s; }
  
  .nav-link {
    font-size: var(--font-size-xl);
    padding: var(--spacing-md);
  }
  
  .dropdown-menu {
    position: static;
    background: transparent;
    border: none;
    box-shadow: none;
    padding: var(--spacing-md) 0;
    opacity: 1;
    visibility: visible;
    transform: none;
    margin-top: var(--spacing-md);
  }
  
  .dropdown-link {
    font-size: var(--font-size-base);
    padding: var(--spacing-sm) 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    justify-content: center;
  }
}

/* ==========================================================================
   Hero区域样式
   ========================================================================== */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
  overflow: hidden;
  transition: background var(--transition-base);
}

/* 暗色主题下的Hero区域 */
[data-theme="dark"] .hero {
  background: linear-gradient(135deg, #000000 0%, #1a1a1a 50%, #0a0a0a 100%);
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-3xl) var(--spacing-md);
  text-align: center;
  position: relative;
  z-index: 2;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
}

.hero-title {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-light);
  line-height: 1.2;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-lg);
}

@media (min-width: 768px) {
  .hero-title {
    font-size: var(--font-size-6xl);
  }
}

.title-line {
  display: block;
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 1s ease forwards;
}

.title-line:nth-child(2) {
  animation-delay: 0.2s;
}

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-subtitle {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-normal);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-2xl);
  line-height: 1.8;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 1s ease 0.4s forwards;
}

@media (min-width: 768px) {
  .hero-subtitle {
    font-size: var(--font-size-xl);
  }
}

/* CTA按钮 */
.hero-cta {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  align-items: center;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 1s ease 0.6s forwards;
}

@media (min-width: 640px) {
  .hero-cta {
    flex-direction: row;
    justify-content: center;
  }
}

.cta-button {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-full);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  text-decoration: none;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.cta-button.primary {
  background-color: var(--color-accent);
  color: white;
  box-shadow: var(--shadow-base);
  position: relative;
  overflow: hidden;
}

.cta-button.primary:hover {
  background-color: var(--color-accent-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  color: white;
}

/* 暗色主题下的金属质感按钮 */
[data-theme="dark"] .cta-button.primary {
  background: var(--gradient-metal);
  color: #000;
  font-weight: var(--font-weight-semibold);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
  box-shadow: 
    0 4px 12px rgba(212, 175, 55, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

[data-theme="dark"] .cta-button.primary:hover {
  background: var(--gradient-metal-dark);
  transform: translateY(-3px);
  box-shadow: 
    0 8px 24px rgba(212, 175, 55, 0.4),
    inset 0 1px 0 rgba(255, 255, 255, 0.3);
  color: #000;
}

[data-theme="dark"] .cta-button.primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  transition: left 0.6s ease;
}

[data-theme="dark"] .cta-button.primary:hover::before {
  left: 100%;
}

.cta-button.secondary {
  background-color: transparent;
  color: var(--color-text-primary);
  border: 2px solid var(--color-border);
}

.cta-button.secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-2px);
}

.button-icon {
  transition: transform var(--transition-base);
}

.cta-button:hover .button-icon {
  transform: translateX(2px);
}

/* Hero装饰元素 */
.hero-decoration {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1;
  pointer-events: none;
}

.decoration-circle {
  position: absolute;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(184, 134, 11, 0.1), rgba(218, 165, 32, 0.05));
  animation: float 6s ease-in-out infinite;
  transition: background var(--transition-base);
}

/* 暗色主题下的装饰圆圈 */
[data-theme="dark"] .decoration-circle {
  background: linear-gradient(135deg, 
    rgba(212, 175, 55, 0.15), 
    rgba(255, 215, 0, 0.1), 
    rgba(184, 134, 11, 0.05)
  );
  box-shadow: 
    0 0 20px rgba(212, 175, 55, 0.2),
    inset 0 0 20px rgba(255, 215, 0, 0.1);
}

.circle-1 {
  width: 200px;
  height: 200px;
  top: 10%;
  right: 10%;
  animation-delay: 0s;
}

.circle-2 {
  width: 150px;
  height: 150px;
  bottom: 20%;
  left: 5%;
  animation-delay: 2s;
}

.circle-3 {
  width: 100px;
  height: 100px;
  top: 50%;
  left: 80%;
  animation-delay: 4s;
}

@keyframes float {
  0%, 100% {
    transform: translateY(0px) rotate(0deg);
  }
  50% {
    transform: translateY(-20px) rotate(180deg);
  }
}

/* 滚动提示 */
.scroll-indicator {
  position: absolute;
  bottom: var(--spacing-lg);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--color-text-light);
  animation: bounce 2s infinite;
  transition: color var(--transition-base);
}

/* 暗色主题下的滚动提示 */
[data-theme="dark"] .scroll-indicator {
  color: var(--color-accent);
  text-shadow: 0 0 10px rgba(212, 175, 55, 0.5);
}

[data-theme="dark"] .scroll-arrow {
  border-color: var(--color-accent);
  filter: drop-shadow(0 0 5px rgba(212, 175, 55, 0.3));
}

.scroll-text {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
}

.scroll-arrow {
  width: 20px;
  height: 20px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg);
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% {
    transform: translateX(-50%) translateY(0);
  }
  40% {
    transform: translateX(-50%) translateY(-10px);
  }
  60% {
    transform: translateX(-50%) translateY(-5px);
  }
}

/* ==========================================================================
   作品展示区域样式
   ========================================================================== */

.featured-works {
  padding: var(--spacing-3xl) 0;
  background-color: var(--color-secondary);
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
}

.section-title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-light);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
}

@media (min-width: 768px) {
  .section-title {
    font-size: var(--font-size-4xl);
  }
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.8;
}

/* 作品网格 */
.works-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
  max-width: 1000px;
  margin: 0 auto;
}

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

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

/* 作品卡片 */
.work-card {
  background-color: var(--color-primary);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
  cursor: pointer;
}

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

.card-image {
  position: relative;
  aspect-ratio: 4/3;
  overflow: hidden;
}

.card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

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

/* 卡片遮罩层 */
.card-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    to bottom,
    rgba(0, 0, 0, 0.1) 0%,
    rgba(0, 0, 0, 0.7) 100%
  );
  display: flex;
  align-items: flex-end;
  padding: var(--spacing-lg);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.work-card:hover .card-overlay {
  opacity: 1;
}

.overlay-content {
  color: white;
}

.card-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-xs);
}

.card-description {
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-md);
  opacity: 0.9;
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-accent-light);
  text-decoration: none;
  transition: color var(--transition-base);
}

.card-link:hover {
  color: white;
}

/* ==========================================================================
   作品分类展示样式
   ========================================================================== */

.portfolio-categories {
  padding: var(--spacing-3xl) 0;
}

.categories-grid {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-3xl);
}

.category-section {
  margin-bottom: var(--spacing-2xl);
}

.category-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.category-title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
}

.category-description {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  max-width: 500px;
  margin: 0 auto;
}

/* 作品集网格 */
.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.portfolio-item {
  background-color: var(--color-primary);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
  cursor: pointer;
}

.portfolio-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-base);
}

.portfolio-item img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  transition: transform var(--transition-base);
}

.portfolio-item:hover img {
  transform: scale(1.02);
}

.item-info {
  padding: var(--spacing-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.item-info h4 {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
}

.item-date {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
}

/* ==========================================================================
   文章展示区域样式 - 参考Linea Calì设计
   ========================================================================== */

.articles-section {
  padding: var(--spacing-3xl) 0;
  background-color: var(--color-primary);
  position: relative;
}

/* 文章分类导航 */
.articles-nav {
  display: flex;
  justify-content: center;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-3xl);
  flex-wrap: wrap;
}

.article-filter {
  padding: var(--spacing-sm) var(--spacing-lg);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-full);
  background-color: transparent;
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.article-filter:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-2px);
}

.article-filter.active {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: white;
  box-shadow: var(--shadow-base);
}

/* 暗色主题下的筛选按钮 */
[data-theme="dark"] .article-filter.active {
  background: var(--gradient-metal);
  color: #000;
  font-weight: var(--font-weight-semibold);
  box-shadow: 
    0 4px 12px rgba(212, 175, 55, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

[data-theme="dark"] .article-filter.active::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.6s ease;
}

[data-theme="dark"] .article-filter.active:hover::before {
  left: 100%;
}

/* 文章网格布局 */
.articles-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-3xl);
}

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

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

/* 文章卡片样式 */
.article-card {
  background-color: var(--color-primary);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
  cursor: pointer;
  border: 1px solid var(--color-border);
  position: relative;
}

.article-card:hover {
  transform: translateY(-12px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(184, 134, 11, 0.2);
}

/* 暗色主题下的文章卡片 */
[data-theme="dark"] .article-card {
  background: linear-gradient(145deg, #1a1a1a, #0f0f0f);
  border-color: #333;
}

[data-theme="dark"] .article-card:hover {
  box-shadow: 
    0 20px 40px rgba(0, 0, 0, 0.4),
    0 0 20px rgba(212, 175, 55, 0.1);
  border-color: rgba(212, 175, 55, 0.3);
}

/* 文章图片区域 */
.article-image {
  position: relative;
  aspect-ratio: 16/10;
  overflow: hidden;
}

.article-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.article-card:hover .article-image img {
  transform: scale(1.08);
}

/* 文章图片遮罩层 */
.article-overlay {
  position: absolute;
  top: var(--spacing-md);
  left: var(--spacing-md);
  z-index: 2;
}

.article-category {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-sm);
  background: linear-gradient(135deg, rgba(184, 134, 11, 0.9), rgba(218, 165, 32, 0.9));
  color: white;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-full);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

/* 暗色主题下的分类标签 */
[data-theme="dark"] .article-category {
  background: var(--gradient-metal);
  color: #000;
  box-shadow: 
    0 2px 8px rgba(0, 0, 0, 0.4),
    inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

/* 文章内容区域 */
.article-content {
  padding: var(--spacing-lg);
}

/* 文章元信息 */
.article-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-xs);
  color: var(--color-text-light);
}

.article-meta time {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.article-meta time::before {
  content: '';
  width: 4px;
  height: 4px;
  background-color: var(--color-accent);
  border-radius: 50%;
}

.read-time {
  position: relative;
  padding-left: var(--spacing-md);
}

.read-time::before {
  content: '';
  position: absolute;
  left: var(--spacing-xs);
  top: 50%;
  transform: translateY(-50%);
  width: 1px;
  height: 12px;
  background-color: var(--color-border);
}

/* 文章标题 */
.article-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  line-height: 1.4;
  margin-bottom: var(--spacing-md);
  transition: color var(--transition-base);
}

.article-card:hover .article-title {
  color: var(--color-accent);
}

/* 暗色主题下的文章标题悬停效果 */
[data-theme="dark"] .article-card:hover .article-title {
  background: var(--gradient-metal);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* 文章摘要 */
.article-excerpt {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--spacing-lg);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* 文章底部区域 */
.article-footer {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

/* 文章标签 */
.article-tags {
  display: flex;
  gap: var(--spacing-xs);
  flex-wrap: wrap;
}

.tag {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-sm);
  background-color: rgba(184, 134, 11, 0.1);
  color: var(--color-accent);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-base);
  border: 1px solid rgba(184, 134, 11, 0.2);
  transition: all var(--transition-base);
}

.tag:hover {
  background-color: rgba(184, 134, 11, 0.2);
  transform: translateY(-1px);
}

/* 暗色主题下的标签 */
[data-theme="dark"] .tag {
  background: rgba(212, 175, 55, 0.15);
  border-color: rgba(212, 175, 55, 0.3);
  color: var(--color-accent);
}

[data-theme="dark"] .tag:hover {
  background: rgba(212, 175, 55, 0.25);
  box-shadow: 0 0 8px rgba(212, 175, 55, 0.2);
}

/* 阅读更多链接 */
.read-more {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-accent);
  text-decoration: none;
  transition: all var(--transition-base);
  position: relative;
}

.read-more:hover {
  color: var(--color-accent-light);
  transform: translateX(4px);
}

.read-more svg {
  transition: transform var(--transition-base);
}

.read-more:hover svg {
  transform: translate(2px, -2px);
}

/* 暗色主题下的阅读更多链接 */
[data-theme="dark"] .read-more {
  color: var(--color-accent);
}

[data-theme="dark"] .read-more:hover {
  color: #FFD700;
  text-shadow: 0 0 8px rgba(255, 215, 0, 0.3);
}

/* 查看更多按钮区域 */
.articles-cta {
  text-align: center;
  margin-top: var(--spacing-2xl);
}

/* 文章筛选动画 */
.article-card.hidden {
  opacity: 0;
  transform: scale(0.8) translateY(20px);
  pointer-events: none;
}

.article-card.visible {
  opacity: 1;
  transform: scale(1) translateY(0);
  pointer-events: auto;
}

/* 加载状态 */
.articles-grid.loading .article-card {
  opacity: 0.5;
  pointer-events: none;
}

/* 响应式优化 */
@media (max-width: 640px) {
  .articles-nav {
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-2xl);
  }
  
  .article-filter {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-xs);
  }
  
  .articles-grid {
    gap: var(--spacing-lg);
  }
  
  .article-content {
    padding: var(--spacing-md);
  }
  
  .article-title {
    font-size: var(--font-size-base);
  }
  
  .article-footer {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-sm);
  }
}

/* 大屏幕优化 */
@media (min-width: 1200px) {
  .articles-grid {
    gap: var(--spacing-3xl);
  }
  
  .article-card:hover {
    transform: translateY(-16px) scale(1.02);
  }
}

/* 打印样式 */
@media print {
  .articles-nav,
  .articles-cta {
    display: none;
  }
  
  .articles-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .article-card {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid #ccc;
  }
  
  .article-image {
    aspect-ratio: 16/9;
  }
}

/* 可访问性增强 */
@media (prefers-reduced-motion: reduce) {
  .article-card,
  .article-filter,
  .read-more,
  .tag {
    transition: none;
  }
  
  .article-card:hover {
    transform: none;
  }
  
  .article-image img {
    transition: none;
  }
  
  .article-card:hover .article-image img {
    transform: none;
  }
}

/* 高对比度模式 */
@media (prefers-contrast: high) {
  .article-card {
    border: 2px solid var(--color-text-primary);
  }
  
  .article-category {
    background: var(--color-text-primary);
    color: var(--color-primary);
  }
  
  .tag {
    border: 2px solid var(--color-accent);
    background: transparent;
  }
}

/* ==========================================================================
   AI对话窗口区域样式
   ========================================================================== */

.ai-chat-section {
  padding: var(--spacing-3xl) 0;
  background-color: var(--color-secondary);
  position: relative;
}

.ai-chat-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-2xl);
  max-width: 1200px;
  margin: 0 auto;
}

@media (min-width: 1024px) {
  .ai-chat-container {
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-3xl);
  }
}

/* AI对话窗口框架 */
.chat-frame {
  background-color: var(--color-primary);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  position: relative;
  min-height: 760px;
}

/* 暗色主题下的对话框架 */
[data-theme="dark"] .chat-frame {
  background: linear-gradient(145deg, #1a1a1a, #0f0f0f);
  border-color: #333;
  box-shadow: 
    0 20px 40px rgba(0, 0, 0, 0.4),
    0 0 20px rgba(212, 175, 55, 0.1);
}

/* 对话窗口头部 */
.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) var(--spacing-lg);
  background: linear-gradient(135deg, #f8f9fa, #ffffff);
  border-bottom: 1px solid var(--color-border);
  position: relative;
}

/* 暗色主题下的头部 */
[data-theme="dark"] .chat-header {
  background: linear-gradient(135deg, #2a2a2a, #1a1a1a);
  border-bottom-color: #333;
}

/* 控制按钮 */
.chat-controls {
  display: flex;
  gap: var(--spacing-xs);
}

.control-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  transition: transform var(--transition-base);
}

.control-dot:hover {
  transform: scale(1.2);
}

.control-dot.red {
  background-color: #ff5f57;
}

.control-dot.yellow {
  background-color: #ffbd2e;
}

.control-dot.green {
  background-color: #28ca42;
}

/* 对话标题 */
.chat-title {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

.ai-icon {
  color: var(--color-accent);
}

/* 暗色主题下的AI图标 */
[data-theme="dark"] .ai-icon {
  color: var(--color-accent);
  filter: drop-shadow(0 0 5px rgba(212, 175, 55, 0.3));
}

/* 状态指示器 */
.chat-status {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.status-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  position: relative;
}

.status-indicator.online {
  background-color: #28ca42;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(40, 202, 66, 0.7);
  }
  70% {
    box-shadow: 0 0 0 10px rgba(40, 202, 66, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(40, 202, 66, 0);
  }
}

/* iframe容器 */
.chat-iframe-container {
  position: relative;
  width: 100%;
  min-height: 700px;
  overflow: hidden;
}

.ai-chat-iframe {
  width: 100%;
  height: 100%;
  border: none;
  background-color: transparent;
}

/* 加载状态 */
.chat-loading {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
  color: var(--color-text-secondary);
  z-index: 10;
  opacity: 1;
  transition: opacity var(--transition-base);
}

.chat-loading.hidden {
  opacity: 0;
  pointer-events: none;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-border);
  border-top: 3px solid var(--color-accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

/* AI功能介绍 */
.ai-features {
  background-color: var(--color-primary);
  padding: var(--spacing-2xl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-base);
  border: 1px solid var(--color-border);
}

/* 暗色主题下的功能介绍 */
[data-theme="dark"] .ai-features {
  background: linear-gradient(145deg, #1a1a1a, #0f0f0f);
  border-color: #333;
}

.features-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-lg);
  text-align: center;
}

/* 暗色主题下的功能标题 */
[data-theme="dark"] .features-title {
  background: var(--gradient-metal);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
}

@media (min-width: 640px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.feature-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  background-color: rgba(184, 134, 11, 0.05);
  border: 1px solid rgba(184, 134, 11, 0.1);
  transition: all var(--transition-base);
}

.feature-item:hover {
  transform: translateY(-4px);
  background-color: rgba(184, 134, 11, 0.1);
  border-color: rgba(184, 134, 11, 0.2);
}

/* 暗色主题下的功能项 */
[data-theme="dark"] .feature-item {
  background: rgba(212, 175, 55, 0.1);
  border-color: rgba(212, 175, 55, 0.2);
}

[data-theme="dark"] .feature-item:hover {
  background: rgba(212, 175, 55, 0.15);
  border-color: rgba(212, 175, 55, 0.3);
  box-shadow: 0 4px 12px rgba(212, 175, 55, 0.1);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-light));
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-md);
  color: white;
  box-shadow: var(--shadow-base);
}

/* 暗色主题下的功能图标 */
[data-theme="dark"] .feature-icon {
  background: var(--gradient-metal);
  color: #000;
  box-shadow: 
    0 4px 12px rgba(212, 175, 55, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.feature-item h4 {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-xs);
}

.feature-item p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* 响应式优化 */
@media (max-width: 768px) {
  .ai-chat-container {
    gap: var(--spacing-xl);
  }
  
  .chat-frame {
    min-height: 600px;
  }
  
  .chat-iframe-container {
    min-height: 540px;
  }
  
  .chat-header {
    padding: var(--spacing-sm) var(--spacing-md);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
  }
  
  .chat-title {
    order: -1;
    flex-basis: 100%;
    justify-content: center;
  }
  
  .ai-features {
    padding: var(--spacing-lg);
  }
  
  .features-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
}

/* 大屏幕优化 */
@media (min-width: 1200px) {
  .chat-frame {
    min-height: 760px;
  }
  
  .chat-iframe-container {
    min-height: 700px;
  }
}

/* 可访问性增强 */
@media (prefers-reduced-motion: reduce) {
  .control-dot,
  .feature-item,
  .loading-spinner {
    transition: none;
    animation: none;
  }
  
  .status-indicator.online {
    animation: none;
  }
}

/* 打印样式 */
@media print {
  .ai-chat-section {
    display: none;
  }
}

/* ==========================================================================
   社交媒体区域样式
   ========================================================================== */

.social-section {
  padding: var(--spacing-3xl) 0;
  background-color: var(--color-secondary);
}

.social-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
  max-width: 600px;
  margin: 0 auto;
}

@media (min-width: 640px) {
  .social-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.social-card {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  background-color: var(--color-primary);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
  text-decoration: none;
  color: inherit;
}

.social-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-base);
  color: inherit;
}

.social-icon {
  flex-shrink: 0;
  width: 60px;
  height: 60px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-base);
}

.social-card:hover .social-icon {
  transform: scale(1.1);
}

.social-card.xiaohongshu .social-icon {
  background: linear-gradient(135deg, #ff2442, #ff6b6b);
  color: white;
}

.social-card.douyin .social-icon {
  background: linear-gradient(135deg, #000000, #333333);
  color: white;
}

.social-info h3 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-xs);
}

.social-info p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

/* ==========================================================================
   关于我区域样式
   ========================================================================== */

.about-section {
  padding: var(--spacing-3xl) 0;
}

.about-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-2xl);
  align-items: center;
}

@media (min-width: 1024px) {
  .about-content {
    grid-template-columns: 1fr 400px;
    gap: var(--spacing-3xl);
  }
}

.about-text {
  max-width: 600px;
}

.about-description {
  margin-bottom: var(--spacing-xl);
}

.about-description p {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: var(--spacing-md);
}

.about-image {
  position: relative;
  aspect-ratio: 3/4;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.about-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ==========================================================================
   联系区域样式
   ========================================================================== */

.contact-section {
  padding: var(--spacing-3xl) 0;
  background-color: var(--color-secondary);
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-2xl);
  max-width: 1000px;
  margin: 0 auto;
}

@media (min-width: 1024px) {
  .contact-content {
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-3xl);
  }
}

/* 联系表单 */
.contact-form {
  background-color: var(--color-primary);
  padding: var(--spacing-2xl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-base);
}

.form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.form-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
}

.form-input,
.form-textarea {
  padding: var(--spacing-md);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-base);
  font-size: var(--font-size-base);
  font-family: inherit;
  color: var(--color-text-primary);
  background-color: var(--color-primary);
  transition: border-color var(--transition-base);
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}

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

.submit-btn {
  margin-top: var(--spacing-md);
  align-self: flex-start;
}

/* 联系信息 */
.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  background-color: var(--color-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.contact-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background-color: rgba(184, 134, 11, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
}

.contact-details h4 {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-xs);
}

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

/* ==========================================================================
   页脚样式
   ========================================================================== */

.footer {
  padding: var(--spacing-3xl) 0 var(--spacing-xl);
  background-color: var(--color-text-primary);
  color: white;
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
}

@media (min-width: 768px) {
  .footer-content {
    grid-template-columns: 1fr 1fr 1fr;
    gap: var(--spacing-2xl);
  }
}

.footer-brand h3 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-xs);
}

.footer-brand p {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.7);
}

.footer-links {
  display: flex;
  gap: var(--spacing-xl);
}

.link-group h4 {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-md);
}

.link-group ul {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.link-group a {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.7);
  transition: color var(--transition-base);
}

.link-group a:hover {
  color: var(--color-accent-light);
}

.footer-social {
  display: flex;
  gap: var(--spacing-md);
}

.social-link {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background-color: rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.7);
  transition: all var(--transition-base);
}

.social-link:hover {
  background-color: var(--color-accent);
  color: white;
  transform: translateY(-2px);
}

.footer-bottom {
  padding-top: var(--spacing-xl);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

.footer-bottom p {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.5);
}

.footer-credit a {
  color: var(--color-accent-light);
  transition: color var(--transition-base);
}

.footer-credit a:hover {
  color: white;
}

/* ==========================================================================
   回到顶部按钮
   ========================================================================== */

.back-to-top {
  position: fixed;
  bottom: var(--spacing-lg);
  right: var(--spacing-lg);
  width: 50px;
  height: 50px;
  border-radius: var(--radius-full);
  background-color: var(--color-accent);
  color: white;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-base);
  z-index: 1000;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

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

/* ==========================================================================
   工具类样式
   ========================================================================== */

/* 文本对齐 */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

/* 显示/隐藏 */
.hidden { display: none !important; }
.visible { display: block !important; }

/* 响应式隐藏 */
@media (max-width: 767px) {
  .hidden-mobile { display: none !important; }
}

@media (min-width: 768px) {
  .hidden-desktop { display: none !important; }
}

/* 间距工具类 */
.mb-0 { margin-bottom: 0 !important; }
.mb-1 { margin-bottom: var(--spacing-xs) !important; }
.mb-2 { margin-bottom: var(--spacing-sm) !important; }
.mb-3 { margin-bottom: var(--spacing-md) !important; }
.mb-4 { margin-bottom: var(--spacing-lg) !important; }
.mb-5 { margin-bottom: var(--spacing-xl) !important; }

.mt-0 { margin-top: 0 !important; }
.mt-1 { margin-top: var(--spacing-xs) !important; }
.mt-2 { margin-top: var(--spacing-sm) !important; }
.mt-3 { margin-top: var(--spacing-md) !important; }
.mt-4 { margin-top: var(--spacing-lg) !important; }
.mt-5 { margin-top: var(--spacing-xl) !important; }

/* ==========================================================================
   动画和过渡效果
   ========================================================================== */

/* 淡入动画 */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* 从下方滑入 */
@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 从左侧滑入 */
@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* 从右侧滑入 */
@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* 缩放动画 */
@keyframes zoomIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* 滚动触发的动画类 */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s ease;
}

.animate-on-scroll.animated {
  opacity: 1;
  transform: translateY(0);
}

/* ==========================================================================
   响应式设计优化
   ========================================================================== */

/* 小屏幕优化 */
@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .hero-title {
    font-size: var(--font-size-3xl);
  }
  
  .section-title {
    font-size: var(--font-size-2xl);
  }
  
  .cta-button {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
  }
}

/* 大屏幕优化 */
@media (min-width: 1536px) {
  .container {
    max-width: 1400px;
  }
  
  .hero-title {
    font-size: 5rem;
  }
  
  .section-title {
    font-size: var(--font-size-5xl);
  }
}

/* 打印样式 */
@media print {
  .header,
  .nav-toggle,
  .back-to-top,
  .scroll-indicator {
    display: none !important;
  }
  
  body {
    font-size: 12pt;
    line-height: 1.4;
  }
  
  .hero {
    min-height: auto;
    padding: 2cm 0;
  }
  
  .section {
    page-break-inside: avoid;
  }
}

/* ==========================================================================
   可访问性优化
   ========================================================================== */

/* 减少动画的用户偏好 */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  .scroll-indicator {
    animation: none;
  }
  
  .decoration-circle {
    animation: none;
  }
}

/* 高对比度模式 */
@media (prefers-contrast: high) {
  :root {
    --color-text-primary: #000000;
    --color-text-secondary: #333333;
    --color-border: #000000;
  }
}

/* 焦点样式 */
*:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* 跳转到主要内容的链接 */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--color-accent);
  color: white;
  padding: 8px;
  text-decoration: none;
  border-radius: var(--radius-base);
  z-index: 1001;
  transition: top var(--transition-base);
}

.skip-link:focus {
  top: 6px;
}

/* ==========================================================================
   加载状态和占位符
   ========================================================================== */

/* 图片加载占位符 */
.image-placeholder {
  background-color: var(--color-secondary);
  background-image: linear-gradient(
    45deg,
    transparent 40%,
    rgba(255, 255, 255, 0.5) 50%,
    transparent 60%
  );
  background-size: 200% 100%;
  animation: shimmer 2s infinite;
}

@keyframes shimmer {
  0% {
    background-position: -200% 0;
  }
  100% {
    background-position: 200% 0;
  }
}

/* 加载动画 */
.loading-spinner {
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-border);
  border-top: 2px solid var(--color-accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  display: inline-block;
  margin-right: var(--spacing-xs);
}

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

/* 表单错误样式 */
.form-input.error,
.form-textarea.error {
  border-color: #e74c3c;
  background-color: rgba(231, 76, 60, 0.05);
}

.error-message {
  color: #e74c3c;
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-xs);
  display: block;
}

/* 页面加载状态 */
body:not(.loaded) {
  opacity: 0;
}

/* 头部滚动状态 */
.header.scrolled {
  background-color: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow-base);
}

[data-theme="dark"] .header.scrolled {
  background-color: rgba(26, 26, 26, 0.98);
}

/* 暗色主题下的移动端菜单 */
[data-theme="dark"] .nav-menu {
  background-color: rgba(10, 10, 10, 0.98);
}

/* 暗色主题下的导航栏 */
[data-theme="dark"] .header {
  background-color: rgba(10, 10, 10, 0.95);
  border-bottom-color: var(--color-border);
}

[data-theme="dark"] .header.scrolled {
  background-color: rgba(10, 10, 10, 0.98);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

/* 暗色主题下的品牌名金属效果 */
[data-theme="dark"] .brand-text {
  background: var(--gradient-metal);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: var(--font-weight-bold);
}

/* 增强的悬停效果 */
.work-card:hover,
.portfolio-item:hover,
.social-card:hover {
  transform: translateY(-8px) scale(1.02);
}

/* 平滑的主题切换动画 */
* {
  transition: background-color var(--transition-base), 
              color var(--transition-base), 
              border-color var(--transition-base);
}

/* ==========================================================================
   AI工具推荐板块 - 紧凑卡片样式
   ========================================================================== */

.ai-tools-section {
  padding: 4rem 0;
  background: var(--color-primary);
}

.ai-tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.25rem;
  margin-top: 2.5rem;
}

/* 紧凑卡片样式 */
.tool-card-compact {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.25rem;
  background: var(--color-secondary);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  text-decoration: none;
  transition: all 0.3s ease;
}

.tool-card-compact:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(184, 134, 11, 0.15);
  border-color: rgba(184, 134, 11, 0.3);
}

.tool-icon-compact {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.tool-content-compact {
  flex: 1;
  min-width: 0;
}

.tool-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.tool-name-compact {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.tool-badge-compact {
  flex-shrink: 0;
  padding: 0.25rem 0.625rem;
  background: rgba(184, 134, 11, 0.1);
  color: var(--color-accent);
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 500;
}

.tool-desc-compact {
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--color-text-secondary);
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* 暗色主题适配 */
[data-theme="dark"] .tool-card-compact {
  background: var(--color-secondary);
  border-color: var(--color-border);
}

[data-theme="dark"] .tool-card-compact:hover {
  box-shadow: 0 8px 24px rgba(212, 175, 55, 0.2);
  border-color: rgba(212, 175, 55, 0.4);
}

[data-theme="dark"] .tool-badge-compact {
  background: rgba(212, 175, 55, 0.15);
  color: var(--color-accent-light);
}

/* 响应式设计 */
@media (max-width: 768px) {
  .ai-tools-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  
  .tool-card-compact {
    padding: 1rem;
  }
  
  .tool-icon-compact {
    width: 42px;
    height: 42px;
  }
  
  .tool-name-compact {
    font-size: 1rem;
  }
  
  .tool-desc-compact {
    font-size: 0.8125rem;
  }
}

@media (min-width: 1200px) {
  .ai-tools-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}