/* ==========================================================================
   1. 变量定义 (CSS Variables)
   ========================================================================== */
:root {
  --color-base: #FFFFFF;
  --color-contrast: #32354d;
  --color-accent: #5152c5;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-background-light: #f8f9fa;
  --color-border: #e9ecef;
  --font-main: 'Noto Sans CJK SC', serif;
  --font-sans: "Microsoft YaHei", sans-serif;
  --font-size-xs: .75rem;
  --font-size-sm: .875rem;
  --font-size-md: 1rem;
  --font-size-lg: clamp(1.25rem, 1.25rem + ((1vw - 0.2rem) * 0.2), 1.5rem);
  --font-size-xl: clamp(1.75rem, 1.75rem + ((1vw - 0.2rem) * 0.3), 2rem);
  --font-size-xxl: clamp(2rem, 2rem + ((1vw - 0.2rem) * 0.5), 2.5rem);
  --spacing-xs: .75rem;
  --spacing-sm: 1.25rem;
  --spacing-md: 2rem;
  --spacing-lg: 3rem;
  --spacing-xl: 4rem;
  --container-md: min(90%, 1200px);
  --container-lg: min(95%, 1400px);
  --radius-sm: 1px;
  --radius-md: 2px;
  --radius-lg: 4px;
  --transition-fast: .2s ease;
  --transition-normal: .3s ease;
  /* 按钮相关变量 */
  --btn-padding-sm: .75rem 1.5rem;
  --btn-padding-lg: 0.5rem 3rem;
  --btn-font-size-sm: var(--font-size-sm);
  --btn-font-size-lg: var(--font-size-md);
}

/* ==========================================================================
   2. 字体与图标 (Fonts & Icons)
   ========================================================================== */
@font-face {
  font-family: 'Material Icons';
  font-style: normal;
  font-weight: 400;
  src: url('./fonts/MaterialIcons-Regular.woff2') format('woff2'),
       url('./fonts/MaterialIcons-Regular.ttf') format('truetype');
}

.material-icons {
  font-family: 'Material Icons';
  font-weight: normal;
  font-style: normal;
  font-size: 24px;
  line-height: 1;
  letter-spacing: normal;
  text-transform: none;
  display: inline-block;
  white-space: nowrap;
  word-wrap: normal;
  direction: ltr;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: 'liga';
}

/* 图标尺寸 */
.material-icons.md-18 { font-size: 18px; }
.material-icons.md-24 { font-size: 24px; }
.material-icons.md-36 { font-size: 36px; }
.material-icons.md-48 { font-size: 48px; }

/* 图标颜色 */
.material-icons.md-dark { color: rgba(0, 0, 0, 0.54); }
.material-icons.md-dark.md-inactive { color: rgba(0, 0, 0, 0.26); }
.material-icons.md-light { color: rgba(255, 255, 255, 1); }
.material-icons.md-light.md-inactive { color: rgba(255, 255, 255, 0.3); }

/* ==========================================================================
   3. 基础重置与通用样式 (Reset & Base)
   ========================================================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-main);
  font-size: var(--font-size-md);
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  text-rendering: optimizeLegibility;
}

.container {
  width: var(--container-md);
  max-width: 100%;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ==========================================================================
   4. 文本排版 (Typography)
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 400;
  line-height: 1.2;
  color: var(--color-contrast);
  margin-bottom: var(--spacing-sm);
}

h1 { font-size: var(--font-size-xxl); }
h2 { font-size: var(--font-size-xl); }
h3 { font-size: var(--font-size-lg); }

p { margin-bottom: var(--spacing-sm); }

.tagline {
  font-size: var(--font-size-xs);
  color: var(--color-text-light);
  font-weight: 400;
}

.description {
  font-size: var(--font-size-md);
  max-width: 400px;
  margin-bottom: var(--spacing-md);
  font-weight: 300;
}

a {
  color: var(--color-contrast);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

a:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* ==========================================================================
   5. 按钮组件 (Buttons)
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--btn-padding-sm);
  font-size: var(--btn-font-size-sm);
  font-weight: 400;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  text-align: center;
  text-decoration: none;
  transition: all var(--transition-normal);
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-contrast);
  color: var(--color-base);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.btn-primary:hover {
  background: var(--color-accent);
  color: var(--color-base);
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.btn-secondary {
  background: transparent;
  color: var(--color-contrast);
  border: 2px solid var(--color-contrast);
}

.btn-secondary:hover {
  background: var(--color-accent);
  color: var(--color-base);
  border-color: var(--color-accent);
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.btn-secondary:active {
  transform: translateY(0);
}

/* ==========================================================================
   6. 导航栏 (Header & Navigation)
   ========================================================================== */
.header {
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--color-border);
  position: relative;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  margin-top: 1.2rem;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.brand-text h1 {
  font-size: var(--font-size-lg);
  margin-bottom: .25rem;
}

.brand-text h1 a:hover {
  text-decoration: none;
}

/* 导航切换按钮 - 默认隐藏 */
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid transparent;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-contrast);
  padding: .25rem .5rem;
  border-radius: var(--radius-sm);
}

.nav-toggle:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* 导航菜单 - 默认横向 */
.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-md);
  align-items: center;
  margin: 0;
  padding: 0;
}

.nav-menu li a {
  padding: .5rem .75rem;
  font-weight: 500;
  display: block;
}

.nav-menu a.active {
  color: var(--color-accent);
  font-weight: 600;
}

/* ==========================================================================
   7. 主要内容区 (Main Content)
   ========================================================================== */
.main {
  padding: var(--spacing-xl) 0;
  min-height: 60vh;
}

.profile {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.profile-image {
  width: 120px;
  height: 120px;
  border-radius: 0;
  object-fit: cover;
}

.profile-actions {
  display: flex;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
}

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

.content-section {
  padding: var(--spacing-md);
  background: var(--color-base);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

/* ==========================================================================
   8. 页脚 (Footer)
   ========================================================================== */
.footer {
  background: var(--color-background-light);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-xl) 0 var(--spacing-lg);
}

.footer-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: var(--spacing-xs);
}

.footer-links a {
  color: var(--color-text-light);
}

.footer-links a:hover {
  color: var(--color-contrast);
}

.copyright {
  border-top: 1px solid var(--color-border);
  padding-top: var(--spacing-md);
  font-size: var(--font-size-xs);
  color: var(--color-text-light);
}

/* ==========================================================================
   9. 联系页面特定样式 (Contact Page)
   ========================================================================== */
.page-header {
  margin-bottom: var(--spacing-xl);
  text-align: center;
}

.page-header h1 {
  margin-bottom: var(--spacing-sm);
}

.contact-details,
.social-media-links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-md);
}

.contact-item,
.social-item,
.tips-item {
  padding: var(--spacing-md);
  background: var(--color-background-light);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--color-accent);
}

.contact-item h3,
.social-item h3,
.tips-item h3 {
  font-size: var(--font-size-md);
  margin-bottom: var(--spacing-xs);
  color: var(--color-accent);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.contact-value {
  font-weight: 500;
  padding: 0.25rem 0.5rem;
  background: rgba(62, 80, 182, 0.1);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
}

.contact-value:hover {
  background: rgba(62, 80, 182, 0.2);
}

.social-description {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  margin-top: var(--spacing-xs);
}

/* ==========================================================================
   10. 响应式设计 (Responsive Design)
   ========================================================================== */

/* 电脑版样式 (768px及以上) */
@media (min-width: 768px) {
  .profile {
    flex-direction: row;
    align-items: center;
    gap: var(--spacing-xl);
  }

  .profile-image {
    width: 150px;
    height: 150px;
  }

  .btn {
    padding: var(--btn-padding-lg);
    font-size: var(--btn-font-size-lg);
    min-height: 3rem;
  }

  .profile-actions {
    gap: var(--spacing-md);
    flex-wrap: wrap;
  }

  .content {
    flex-direction: row;
    flex-wrap: wrap;
    gap: var(--spacing-xl);
  }

  .content-section {
    flex: 1;
    min-width: 300px;
  }

  .footer-content {
    flex-direction: row;
    justify-content: space-between;
    gap: var(--spacing-xl);
  }

  .footer-section {
    flex: 1;
    min-width: 200px;
  }

  .contact-details,
  .social-media-links {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .contact-item,
  .social-item {
    flex: 1;
    min-width: 250px;
  }

  .tips-item {
    margin-bottom: var(--spacing-md);
  }

  .nav-toggle {
    display: none !important;
  }

  .nav-menu {
    display: flex !important;
    flex-direction: row;
    position: static;
    background: none;
    box-shadow: none;
    padding: 0;
    width: auto;
  }
}

/* 中等屏幕优化 */
@media (min-width: 1024px) {
  .profile-actions {
    gap: var(--spacing-lg);
  }
}

/* 移动端样式 (767px及以下) */
@media (max-width: 767px) {
  .container {
    padding: 0 var(--spacing-sm);
  }

  .nav {
    position: relative;
  }

  .nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    padding: 0;
    border: none;
    background: transparent;
    cursor: pointer;
  }

  .nav-toggle .material-icons {
    font-size: 2rem;
    line-height: 1;
    color: #333333;
  }

  .nav-menu {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-base);
    padding: var(--spacing-md);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    gap: var(--spacing-sm);
  }

  .nav-menu.active {
    display: flex;
  }

  .nav-menu li {
    width: 100%;
  }

  .nav-menu li a {
    padding: 0.75rem 0;
    display: block;
  }

  .profile-actions {
    flex-direction: column;
    width: 100%;
  }

  .btn {
    width: 100%;
    min-height: 2.75rem;
  }

  .content-section {
    padding: var(--spacing-sm);
  }
}

/* 打印样式 */
@media print {
  .header, .footer, .btn { display: none; }
  body { font-size: 12pt; line-height: 1.5; }
  .container { width: 100%; padding: 0; }
  h1, h2, h3 { page-break-after: avoid; }
  img { max-width: 50% !important; }
  * { background: transparent !important; color: #000 !important; box-shadow: none !important; }
}