/* ========================================
   FigEdu 留学公司官网 - 主样式表
   公司: 爱慧课国际教育 (AVEFIG)
   ======================================== */

/* ===============================
   1. CSS变量定义
   =============================== */
:root {
  /* 品牌色彩 */
  --primary-blue: #253A85;      /* 深蓝色 */
  --accent-gold: #EDC857;        /* 金黄色 */
  --text-dark: #333333;          /* 深色 */
  --text-gray: #6C757D;          /* 中灰色 */
  --text-light: #FFFFFF;         /* 白色 */
  --bg-light: #F8F9FA;           /* 浅灰背景 */
  --bg-white: #E8EAED;            /* 页面背景 */
  --bg-header: #E8EAED;          /* Header背景 */
  --bg-footer: #E8EAED;          /* Footer背景 */
  --border-color: #E0E0E0;       /* 边框灰色 */
  
  /* 字体设置 */
  --font-heading: 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
  --font-body: 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
  
  /* 尺寸设置 */
  --header-height: 100px;
  --header-height-mobile: 90px;
  --container-max-width: 1200px;
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 32px;
  --spacing-xl: 48px;
  --spacing-xxl: 64px;
  
  /* 阴影 */
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
  --shadow-md: 0 4px 8px rgba(0,0,0,0.15);
  --shadow-lg: 0 8px 16px rgba(0,0,0,0.2);
}

/* ===============================
   2. 全局重置
   =============================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-body);
  color: var(--text-dark);
  line-height: 1.6;
  background-color: var(--bg-white);
}

/* ===============================
   3. 通用工具类
   =============================== */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.btn {
  display: inline-block;
  padding: 8px 20px;
  border-radius: 4px;
  text-decoration: none;
  font-weight: 500;
  transition: all 0.3s ease;
  cursor: pointer;
  border: none;
  font-size: 0.9rem;
}

.btn-primary {
  background-color: var(--accent-gold);
  color: #333;
}

.btn-primary:hover {
  background-color: #E0B845;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-blue {
  background-color: var(--primary-blue);
  color: var(--text-light);
}

.btn-blue:hover {
  background-color: #1e2d6b;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* 确保header-top中的按钮正确显示白字 */
.header-top .btn-blue {
  color: var(--text-light) !important;
}

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

.btn-secondary:hover {
  background-color: var(--primary-blue);
  color: var(--text-light);
}

/* ===============================
   4. Header 顶部导航
   =============================== */
.header {
  background-color: var(--bg-header);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 1000;
  width: 100%;
}

.header-top {
  background-color: var(--bg-header);
  color: var(--text-dark);
  padding: var(--spacing-xs) 0;
}

.header-top .container {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: var(--spacing-md);
  font-size: 0.875rem;
}

.header-top a {
  color: var(--text-dark);
  text-decoration: none;
  transition: opacity 0.3s ease;
}

.header-top a:hover {
  opacity: 0.8;
}

.header-main {
  background-color: var(--bg-header);
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-section {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  height: 100%;
  flex: 0 0 33%;
}

.logo-section img {
  height: 100%;
  width: auto;
}

.logo-text {
  font-size: 2rem;
  font-weight: 300;
  color: var(--primary-blue);
  line-height: 1;
  white-space: nowrap;
}

.logo-divider {
  width: 1px;
  height: 30px;
  background-color: var(--border-color);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.header-actions .btn {
  padding: 8px 20px;
  font-size: 0.9rem;
}

.nav-menu {
  display: block;
}

.nav-menu ul {
  list-style: none;
  display: flex;
  gap: var(--spacing-lg);
}

.nav-menu a {
  color: #000000;
  text-decoration: none;
  font-weight: 500;
  font-size: 1rem;
  transition: color 0.3s ease;
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-menu a:hover {
  color: var(--primary-blue);
}

/* ===============================
   5. Hero Section
   =============================== */
.hero {
  position: relative;
  height: 90vh;
  min-height: 600px;
  display: flex;
  align-items: center;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: transparent;
}

.hero-content {
  position: relative;
  z-index: 2;
  color: var(--text-light);
  max-width: 700px;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  line-height: 1.2;
}

.hero-subtitle {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-lg);
  line-height: 1.6;
  opacity: 0.95;
}

/* ===============================
   6. Main Content
   =============================== */
.main-content {
  padding: var(--spacing-xxl) 0;
}

/* ===============================
   7. Footer
   =============================== */
.footer {
  background-color: var(--bg-footer);
  color: var(--text-dark);
  padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.footer-column h3 {
  margin-bottom: var(--spacing-md);
  font-size: 1rem;
  font-weight: 600;
  color: #333333;
}

.footer-column ul {
  list-style: none;
}

.footer-column li {
  font-size: 0.875rem;
  color: #333333;
  margin-bottom: var(--spacing-xs);
}

.footer-column a {
  color: #333333;
  text-decoration: none;
  transition: color 0.3s ease;
  display: block;
  margin-bottom: var(--spacing-xs);
  font-size: 0.875rem;
}

.footer-column a:hover {
  color: var(--primary-blue);
}

.social-links {
  display: flex;
  gap: var(--spacing-sm);
}

.social-links a {
  display: inline-flex;
  width: 40px;
  height: 40px;
  background-color: #F5F5F5;
  border-radius: 50%;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  text-decoration: none;
  overflow: hidden;
}

.social-links a:hover {
  background-color: var(--primary-blue);
  transform: translateY(-3px);
}

.social-links a img {
  width: 24px;
  height: 24px;
  filter: brightness(0) saturate(100%);
  object-fit: contain;
}

.social-links a:hover img {
  filter: brightness(0) invert(1);
}

/* 所有社交媒体图标统一为白色风格 */

.footer-bottom {
  padding-top: var(--spacing-md);
  text-align: center;
  font-size: 0.75rem;
  color: #666666;
}

.footer-bottom a {
  color: #666666;
  text-decoration: none;
}

.footer-bottom a:hover {
  text-decoration: underline;
}

/* ===============================
   4.1 移动端汉堡菜单按钮
   =============================== */

/* 桌面端隐藏移动端专用元素 */
.nav-menu-footer,
.nav-menu-close {
  display: none;
}

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--primary-blue) 0%, #1E2D6E 100%);
  border: none;
  border-radius: 12px;
  cursor: pointer;
  padding: 0;
  z-index: 1001;
  box-shadow: 0 4px 12px rgba(37, 58, 133, 0.3);
  transition: all 0.3s ease;
}

.mobile-menu-toggle:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 20px rgba(37, 58, 133, 0.4);
}

.mobile-menu-toggle:active {
  transform: scale(0.95);
}

.mobile-menu-toggle .hamburger-line {
  display: block;
  width: 24px;
  height: 2.5px;
  background-color: white;
  border-radius: 2px;
  transition: all 0.3s ease;
  margin: 3px 0;
}

/* 汉堡菜单动画 */
.mobile-menu-toggle.active .hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.mobile-menu-toggle.active .hamburger-line:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.mobile-menu-toggle.active .hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===============================
   4.2 移动端导航覆盖样式
   =============================== */
@media (max-width: 1024px) {
  /* 显示汉堡菜单按钮 */
  .mobile-menu-toggle {
    display: flex;
  }
  
  /* 导航菜单移动端样式 - 品牌化设计 */
  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 85%;
    max-width: 360px;
    height: 100vh;
    background: linear-gradient(180deg, #FFFFFF 0%, #F8F9FA 100%);
    box-shadow: -4px 0 30px rgba(37, 58, 133, 0.2);
    padding: calc(var(--header-height-mobile) + 30px) 24px 30px;
    transition: right 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1000;
    overflow-y: auto;
    display: block !important;
  }
  
  /* 菜单顶部品牌区域 */
  .nav-menu::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-blue) 0%, var(--accent-gold) 100%);
  }
  
  .nav-menu.active {
    right: 0;
  }
  
  /* 菜单列表样式 */
  .nav-menu ul {
    flex-direction: column;
    gap: 0;
    margin-top: 20px;
  }
  
  .nav-menu li {
    border-bottom: none;
    margin-bottom: 4px;
  }
  
  .nav-menu a {
    display: flex;
    align-items: center;
    padding: 16px 20px;
    font-size: 1.1rem;
    color: var(--primary-blue);
    background-color: transparent;
    border-radius: 12px;
    transition: all 0.3s ease;
    font-weight: 500;
    position: relative;
    overflow: hidden;
  }
  
  /* 菜单项图标 */
  .nav-menu a::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 0;
    background-color: var(--accent-gold);
    border-radius: 0 4px 4px 0;
    transition: height 0.3s ease;
  }
  
  .nav-menu a:hover {
    color: var(--primary-blue);
    background-color: rgba(37, 58, 133, 0.05);
    transform: translateX(4px);
  }
  
  .nav-menu a:hover::before {
    height: 60%;
  }
  
  /* 当前页签高亮 */
  .nav-menu a.active {
    background: linear-gradient(90deg, rgba(37, 58, 133, 0.1) 0%, rgba(237, 200, 87, 0.1) 100%);
    color: var(--primary-blue);
  }
  
  .nav-menu a.active::before {
    height: 60%;
  }
  
  /* 菜单底部品牌信息 */
  .nav-menu-footer {
    position: absolute;
    bottom: 30px;
    left: 24px;
    right: 24px;
    padding-top: 20px;
    border-top: 1px solid rgba(37, 58, 133, 0.1);
    text-align: center;
  }
  
  .nav-menu-footer p {
    font-size: 0.85rem;
    color: var(--text-gray);
    margin: 0;
  }
  
  .nav-menu-footer .brand-name {
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary-blue);
    margin-bottom: 4px;
  }
  
  /* 遮罩层 */
  .nav-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: linear-gradient(135deg, rgba(37, 58, 133, 0.8) 0%, rgba(0, 0, 0, 0.6) 100%);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 999;
    backdrop-filter: blur(4px);
  }
  
  .nav-menu.active ~ .nav-menu-overlay,
  .nav-menu.active + .nav-menu-overlay,
  .nav-menu.active + .mobile-menu-toggle + .nav-menu-overlay {
    opacity: 1;
    visibility: visible;
  }
  
  /* 关闭按钮 */
  .nav-menu-close {
    position: absolute;
    top: calc(var(--header-height-mobile) - 60px);
    right: 20px;
    width: 36px;
    height: 36px;
    background: rgba(37, 58, 133, 0.1);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
  }
  
  .nav-menu-close:hover {
    background: var(--primary-blue);
    transform: rotate(90deg);
  }
  
  .nav-menu-close::before,
  .nav-menu-close::after {
    content: '';
    position: absolute;
    width: 18px;
    height: 2px;
    background-color: var(--primary-blue);
    border-radius: 2px;
  }
  
  .nav-menu-close:hover::before,
  .nav-menu-close:hover::after {
    background-color: white;
  }
  
  .nav-menu-close::before {
    transform: rotate(45deg);
  }
  
  .nav-menu-close::after {
    transform: rotate(-45deg);
  }
}

/* ===============================
   8. 响应式设计（扩展）
   =============================== */
@media (min-width: 1025px) {
  .nav-menu {
    display: block !important;
  }
  
  .mobile-menu-toggle {
    display: none !important;
  }
}

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

@media (max-width: 767px) {
  /* 头部调整 */
  .header {
    height: var(--header-height-mobile);
  }
  
  .header-top {
    display: none;
  }
  
  .header-main {
    padding: 0 var(--spacing-sm);
    justify-content: space-between;
  }
  
  /* Logo调整 */
  .logo-section {
    flex: 0 0 auto;
    gap: var(--spacing-xs);
  }
  
  .logo-section img {
    height: 60px;
    width: auto;
  }
  
  .logo-text {
    font-size: 1rem;
    max-width: 120px;
    line-height: 1.2;
  }
  
  /* Hero调整 */
  .hero {
    height: 60vh;
    min-height: 400px;
  }
  
  .hero-title {
    font-size: 1.8rem;
  }
  
  .hero-subtitle {
    font-size: 0.95rem;
  }
  
  /* 主内容区 */
  .main-content {
    padding: var(--spacing-lg) 0;
  }
  
  /* Footer调整 */
  .footer {
    padding: var(--spacing-lg) 0 var(--spacing-md);
  }
  
  .footer-content {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
  }
  
  .footer-column {
    text-align: center;
  }
  
  .social-links {
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.5rem;
  }
  
  .hero-subtitle {
    font-size: 0.9rem;
    line-height: 1.5;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
  }
  
  .logo-text {
    font-size: 0.9rem;
    max-width: 100px;
  }
  
  .logo-section img {
    height: 50px;
  }
}

/* ===============================
   9. 申请表单样式（腾讯文档嵌入）
   =============================== */
.application-form {
  max-width: 700px;
  margin: 0 auto;
  background: white;
  padding: var(--spacing-xl);
  border-radius: 8px;
  box-shadow: var(--shadow-md);
}

.application-form iframe {
  width: 100%;
  min-height: 600px;
  border: none;
  border-radius: 8px;
  box-shadow: var(--shadow-md);
  background: white;
  display: block;
}

.application-form .form-info {
  text-align: center;
  margin-bottom: var(--spacing-md);
  padding: var(--spacing-md);
  background: #f8f9fa;
  border-radius: 8px;
  border-left: 4px solid var(--primary-blue);
}

.application-form .form-info p {
  margin: var(--spacing-xs) 0;
  font-size: 0.9rem;
  color: var(--text-gray);
}

.application-form .form-info p:first-child {
  font-size: 0.95rem;
  color: var(--text-dark);
  font-weight: 500;
}

.form-note {
  font-size: 0.875rem;
  color: var(--text-gray);
  margin-top: var(--spacing-md);
  text-align: center;
}

@media (max-width: 768px) {
  .application-form {
    padding: var(--spacing-md);
    margin: 0 var(--spacing-sm);
  }
  
  .application-form iframe {
    min-height: 800px;
  }
  
  .application-form .form-info {
    padding: var(--spacing-sm);
  }
  
  .application-form .form-info p {
    font-size: 0.85rem;
  }
}