/* 
HSK 趣学中文 - 着陆页样式
*/

/* ========== 基础设置 ========== */
:root {
  --color-primary: #E62E2E;      /* 中国红 */
  --color-secondary: #FFD700;    /* 金黄色 */
  --color-accent: #4A90E2;       /* 蓝色强调 */
  --color-background: #F8F5E6;   /* 米白色背景 */
  --color-text: #333333;         /* 深灰色文字 */
  --color-text-light: #666666;   /* 浅灰色文字 */
  --color-border: #E5E5E5;       /* 边框颜色 */
  
  --font-sans: 'Noto Sans SC', sans-serif;
  --font-serif: 'Noto Serif SC', serif;
  
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.1);
  
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 12px;
  
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
}

/* 重置默认样式 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

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

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

ul, ol {
  list-style: none;
}

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

/* ========== 布局设置 ========== */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

section {
  padding: 80px 0;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  color: var(--color-text);
  text-align: center;
  margin-bottom: 40px;
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 80px;
  height: 4px;
  background-color: var(--color-primary);
  margin: 15px auto 0;
  border-radius: var(--border-radius-sm);
}

.section-description {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 40px;
  color: var(--color-text-light);
  font-size: 1.1rem;
}

/* ========== 按钮样式 ========== */
.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: var(--border-radius-md);
  font-weight: 500;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-normal);
  font-size: 1rem;
}

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

.btn-primary:hover {
  background-color: #CC2828;
  border-color: #CC2828;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
  background-color: rgba(230, 46, 46, 0.1);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

.btn-outline:hover {
  background-color: var(--color-primary);
  color: white;
  transform: translateY(-2px);
}

.btn-small {
  padding: 8px 16px;
  font-size: 0.9rem;
}

.btn-large {
  padding: 14px 32px;
  font-size: 1.1rem;
  font-weight: 600;
}

/* ========== 头部导航 ========== */
.site-header {
  background-color: white;
  padding: 15px 0;
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
}

.logo-image {
  height: 40px;
  margin-right: 10px;
}

.logo-text {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  color: var(--color-primary);
  font-weight: 600;
}

.main-nav ul {
  display: flex;
  gap: 30px;
}

.main-nav a {
  color: var(--color-text);
  font-weight: 500;
  position: relative;
}

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

.main-nav a::after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: -5px;
  left: 0;
  background-color: var(--color-primary);
  transition: width var(--transition-normal);
}

.main-nav a:hover::after {
  width: 100%;
}

.language-switch {
  display: flex;
  align-items: center;
  gap: 10px;
}

.language-switch a {
  color: var(--color-text-light);
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

.language-switch a:hover,
.language-switch a.active {
  color: var(--color-primary);
  font-weight: 500;
}

.separator {
  color: var(--color-text-light);
}

/* ========== 英雄区域 ========== */
.hero {
  background: linear-gradient(135deg, #FFF8E6 0%, #FFF 100%);
  padding: 100px 0;
}

.hero .container {
  display: flex;
  align-items: center;
  gap: 60px;
}

.hero-content {
  flex: 1;
}

.hero-image {
  flex: 1;
  display: flex;
  justify-content: center;
}

.hero h1 {
  font-family: var(--font-serif);
  font-size: 3rem;
  line-height: 1.2;
  margin-bottom: 20px;
  color: var(--color-text);
}

.hero p {
  font-size: 1.2rem;
  color: var(--color-text-light);
  margin-bottom: 30px;
  max-width: 90%;
}

.hero-buttons {
  display: flex;
  gap: 20px;
}

/* ========== 特色部分 ========== */
.features {
  background-color: white;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
}

.feature-card {
  background-color: white;
  border-radius: var(--border-radius-lg);
  padding: 30px;
  box-shadow: var(--shadow-md);
  text-align: center;
  transition: transform var(--transition-normal);
}

.feature-card:hover {
  transform: translateY(-5px);
}

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 1.4rem;
  margin-bottom: 15px;
  color: var(--color-primary);
}

.feature-card p {
  color: var(--color-text-light);
}

/* ========== 游戏展示 ========== */
.games {
  background-color: var(--color-background);
}

.games-showcase {
  display: flex;
  flex-direction: column;
  gap: 60px;
}

.game-card {
  display: flex;
  align-items: center;
  gap: 40px;
  background-color: white;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  padding: 30px;
}

.game-card.reverse {
  flex-direction: row-reverse;
}

.game-image {
  flex: 1;
  display: flex;
  justify-content: center;
}

.game-info {
  flex: 1;
}

.game-info h3 {
  font-size: 1.8rem;
  color: var(--color-primary);
  margin-bottom: 15px;
  font-family: var(--font-serif);
}

.game-info p {
  margin-bottom: 25px;
  color: var(--color-text-light);
}

/* ========== 词汇学习部分 ========== */
.vocabulary {
  background-color: white;
}

.vocab-themes {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
  margin-bottom: 40px;
}

.theme-card {
  background-color: #FAFAFA;
  border-radius: var(--border-radius-md);
  padding: 25px;
  box-shadow: var(--shadow-sm);
  border-top: 4px solid var(--color-primary);
}

.theme-card h3 {
  font-size: 1.4rem;
  margin-bottom: 20px;
  text-align: center;
  color: var(--color-primary);
}

.vocab-sample {
  margin-bottom: 25px;
}

.vocab-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  border-bottom: 1px solid var(--color-border);
  padding: 12px 0;
}

.vocab-item:last-child {
  border-bottom: none;
}

.vocab-item .chinese {
  font-size: 1.8rem;
  font-weight: 600;
  margin-bottom: 5px;
}

.vocab-item .pinyin {
  color: var(--color-accent);
  margin-bottom: 3px;
  font-size: 0.9rem;
}

.vocab-item .english {
  color: var(--color-text-light);
  font-size: 0.9rem;
}

.theme-card .btn {
  display: block;
  margin: 0 auto;
  width: fit-content;
}

.cta-container {
  text-align: center;
  margin-top: 50px;
}

/* ========== 关于部分 ========== */
.about {
  background-color: var(--color-background);
}

.about .container {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 60px;
}

.about-content p {
  margin-bottom: 20px;
  color: var(--color-text-light);
}

.testimonials h3 {
  font-size: 1.6rem;
  margin-bottom: 25px;
  color: var(--color-primary);
  font-family: var(--font-serif);
}

.testimonial {
  background-color: white;
  padding: 25px;
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-sm);
  margin-bottom: 25px;
}

.testimonial:last-child {
  margin-bottom: 0;
}

.quote {
  font-style: italic;
  position: relative;
  padding-left: 25px;
  margin-bottom: 15px;
}

.quote::before {
  content: '"';
  font-size: 3rem;
  color: var(--color-primary);
  opacity: 0.2;
  position: absolute;
  left: 0;
  top: -15px;
}

.author {
  text-align: right;
  color: var(--color-text-light);
  font-weight: 500;
}

/* ========== 号召行动部分 ========== */
.cta-section {
  background: linear-gradient(135deg, var(--color-primary) 0%, #FF4B4B 100%);
  color: white;
  text-align: center;
  padding: 80px 0;
}

.cta-section h2 {
  font-size: 2.2rem;
  margin-bottom: 15px;
}

.cta-section p {
  margin-bottom: 30px;
  font-size: 1.2rem;
  opacity: 0.9;
}

.cta-section .btn-primary {
  background-color: white;
  color: var(--color-primary);
  border-color: white;
}

.cta-section .btn-primary:hover {
  background-color: transparent;
  color: white;
}

/* ========== 页脚 ========== */
.site-footer {
  background-color: #222;
  color: #999;
  padding-top: 60px;
}

.footer-content {
  text-align: center;
  margin-bottom: 40px;
}

.footer-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 15px;
}

.logo-image-small {
  height: 30px;
  margin-right: 10px;
}

.footer-tagline {
  color: #777;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 30px;
  margin-bottom: 40px;
}

.footer-column h4 {
  color: white;
  margin-bottom: 20px;
  font-size: 1.1rem;
}

.footer-column ul li {
  margin-bottom: 12px;
}

.footer-column a {
  color: #999;
  transition: color var(--transition-fast);
}

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

.copyright {
  background-color: #111;
  padding: 15px 0;
  text-align: center;
  font-size: 0.9rem;
  color: #777;
}

/* ========== 响应式设计 ========== */
@media (max-width: 992px) {
  .section-title {
    font-size: 2.2rem;
  }
  
  .hero .container {
    flex-direction: column;
    text-align: center;
  }
  
  .hero h1 {
    font-size: 2.5rem;
  }
  
  .hero p {
    max-width: 100%;
  }
  
  .hero-buttons {
    justify-content: center;
  }
  
  .about .container {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .game-card {
    flex-direction: column;
    text-align: center;
  }
  
  .game-card.reverse {
    flex-direction: column;
  }
}

@media (max-width: 768px) {
  section {
    padding: 60px 0;
  }
  
  .site-header .container {
    flex-wrap: wrap;
    gap: 15px;
  }
  
  .main-nav {
    order: 3;
    width: 100%;
  }
  
  .main-nav ul {
    justify-content: center;
    gap: 20px;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
    max-width: 500px;
    margin: 0 auto;
  }
  
  .vocab-themes {
    grid-template-columns: 1fr;
    max-width: 500px;
    margin: 0 auto 40px;
  }
}

@media (max-width: 576px) {
  .section-title {
    font-size: 1.8rem;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .hero-buttons {
    flex-direction: column;
    gap: 15px;
  }
  
  .btn {
    width: 100%;
  }
  
  .game-card {
    padding: 20px;
  }
  
  .footer-links {
    grid-template-columns: 1fr;
    gap: 25px;
  }
}