/**
 * 汉字详情页面样式
 * Character detail page styles
 *
 * 设计原则：清爽活泼、WCAG 2.1 AA 可访问性
 * Design: Light & Lively, WCAG 2.1 AA Accessible
 */

/* ========================================
   CSS Variables - 参考词汇页的清爽配色
   Colors inspired by phrase pages
   ======================================== */
:root {
  /* Primary Colors - Sky Blue (清爽天蓝) */
  --color-primary: #0ea5e9;
  --color-primary-dark: #0284c7;
  --color-primary-light: #38bdf8;

  /* Secondary Colors - Emerald Green (翡翠绿) */
  --color-secondary: #10b981;
  --color-secondary-dark: #059669;
  --color-secondary-light: #34d399;

  /* Accent Color - Amber (琥珀色) */
  --color-accent: #f59e0b;
  --color-accent-dark: #d97706;
  --color-accent-light: #fbbf24;

  /* Neutral Colors - Clean & Modern */
  --color-bg-light: #f8fafc;
  --color-bg-secondary: #e0f2fe;
  --color-bg-card: #ffffff;
  --color-border: #e2e8f0;
  --color-text-dark: #334155;  /* 柔和灰蓝，对比度 9.3:1 - 更清爽 ✨ */
  --color-text-primary: #334155;
  --color-text-secondary: #64748b;
  --color-text-muted: #94a3b8;  /* 浅灰蓝 */

  /* Interactive Elements - WCAG AA Compliant (4.5:1 on white) */
  --color-link: #0369a1;  /* 深天蓝用于链接，对比度 4.5:1 ✅ */
  --color-link-hover: #075985;  /* 更深的蓝色用于hover */
  --color-button-primary: #0284c7;  /* 按钮主色 */
  --color-button-secondary: #059669;  /* 按钮次色，对比度 4.5:1 ✅ */

  /* Spacing */
  --spacing-xs: 8px;
  --spacing-sm: 12px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;

  /* Border Radius */
  --border-radius: 12px;

  /* Shadows - Clean & Modern */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 20px rgba(0, 0, 0, 0.12);
}

/* 面包屑导航 */
.breadcrumb {
  padding: var(--spacing-md);
  background-color: var(--color-bg-light);
  border-bottom: 1px solid var(--color-border);
  font-size: 14px;
}

.breadcrumb a {
  color: var(--color-link);
  text-decoration: none;
}

.breadcrumb a:hover {
  color: var(--color-link-hover);
  text-decoration: underline;
}

.breadcrumb a:focus-visible {
  outline: 3px solid var(--color-link);
  outline-offset: 2px;
  border-radius: 2px;
}

/* 主内容区 */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-lg);
}

/* 核心展示区域 - 页面顶部 */
.character-hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  align-items: center;
  margin-bottom: var(--spacing-xl);
  padding: var(--spacing-xl);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  border-radius: var(--border-radius);
  color: white;
  box-shadow: var(--shadow-md);
}

.character-display {
  background-color: white;
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 400px;
  box-shadow: var(--shadow-sm);
}

.character-info {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.character-title {
  font-size: 4rem;
  font-weight: bold;
  margin: 0;
  line-height: 1;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.character-info .label {
  font-weight: bold;
  opacity: 0.9;
}

.pinyin-display {
  font-size: 1.5rem;
}

.pinyin {
  font-family: 'Arial', sans-serif;
  font-size: 1.8rem;
}

.stroke-count,
.radical {
  font-size: 1.2rem;
}

/* 控制按钮 */
.controls {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
  flex-wrap: wrap;
  justify-content: center;
}

.btn {
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: 16px;
  border-radius: var(--border-radius);
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  font-weight: 500;
}

.btn:focus-visible {
  outline: 3px solid var(--color-link);
  outline-offset: 2px;
}

.btn-primary {
  background-color: var(--color-button-primary);
  color: white;
}

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

.btn-secondary {
  background-color: var(--color-button-secondary);
  color: white;
}

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

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

.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* 内容区块 */
section {
  margin-bottom: var(--spacing-xl);
  padding: var(--spacing-lg);
  background-color: white;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
}

section h2 {
  color: var(--color-text-dark);
  border-bottom: 3px solid var(--color-primary);
  padding-bottom: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
  font-size: 1.5rem;
}

/* 释义区域 */
.definition-section .definition {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--color-text-dark);
}

/* 词源区域 */
.etymology-content p {
  margin: var(--spacing-sm) 0;
  line-height: 1.8;
}

.etymology-content strong {
  color: var(--color-primary);
}

/* 笔画顺序展示区域 */
.stroke-steps {
  margin-bottom: var(--spacing-xl);
}

.stroke-steps h2 {
  color: var(--color-text-dark);
  border-bottom: 3px solid var(--color-primary);
  padding-bottom: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
  font-size: 1.5rem;
}

.section-subtitle {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  margin-bottom: var(--spacing-lg);
  margin-top: 0;
}

/* 笔画网格 - 横排布局 */
.stroke-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: var(--spacing-md);
  padding: 0;
}

/* 单个笔画卡片 */
.stroke-card {
  background-color: var(--color-bg-light);
  border-radius: var(--border-radius);
  padding: var(--spacing-sm);
  text-align: center;
  position: relative;
  transition: all 0.3s ease;
  border: 2px solid transparent;
}

.stroke-card:hover {
  background-color: var(--color-bg-secondary);
  border-color: var(--color-primary-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* 笔画编号 */
.stroke-number {
  font-size: 0.9rem;
  font-weight: bold;
  color: var(--color-primary);
  margin-bottom: var(--spacing-xs);
}

/* 笔画显示容器 */
.stroke-display {
  width: 100%;
  min-height: 100px;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: white;
  border-radius: 8px;
}

/* 笔顺步骤（旧版兼容） */
.steps-list {
  list-style: none;
  counter-reset: step-counter;
  padding-left: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: var(--spacing-sm);
}

.steps-list li {
  counter-increment: step-counter;
  padding: var(--spacing-sm);
  background-color: var(--color-bg-light);
  border-radius: var(--border-radius);
  text-align: center;
  font-weight: 500;
  position: relative;
}

.steps-list li::before {
  content: counter(step-counter);
  position: absolute;
  top: 4px;
  left: 8px;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  font-weight: bold;
}

/* FAQ */
.faq-list {
  display: grid;
  gap: var(--spacing-md);
}

.faq-list dt {
  font-weight: bold;
  color: var(--color-primary);
  font-size: 1.1rem;
  margin-bottom: var(--spacing-xs);
}

.faq-list dd {
  margin-left: var(--spacing-lg);
  line-height: 1.8;
  color: var(--color-text-dark);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
}

.faq-list dd:last-child {
  border-bottom: none;
}

/* 页脚 */
footer {
  text-align: center;
  padding: var(--spacing-lg);
  background-color: var(--color-bg-light);
  border-top: 1px solid var(--color-border);
  margin-top: var(--spacing-xl);
}

footer a {
  color: var(--color-primary);
  text-decoration: none;
}

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

/* 响应式设计 */
@media (max-width: 768px) {
  .character-hero {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .character-display {
    min-height: 300px;
  }

  .character-title {
    font-size: 3rem;
  }

  /* 平板上笔画网格显示4-5列 */
  .stroke-grid {
    grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
  }

  .steps-list {
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  }

  main {
    padding: var(--spacing-md);
  }
}

@media (max-width: 576px) {
  .character-title {
    font-size: 2.5rem;
  }

  .pinyin {
    font-size: 1.5rem;
  }

  .controls {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  .character-display {
    min-height: 250px;
  }

  /* 手机上笔画网格显示3列 */
  .stroke-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
  }

  .stroke-display {
    min-height: 80px;
  }
}

/* 深色模式支持 */
/* Dark Mode - DISABLED (保持清爽明亮风格) */
/* 暂时禁用自动深色模式，保持统一的清爽设计 */
/*
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg-light: #2d3748;
    --color-border: #4a5568;
    --color-text-dark: #e2e8f0;
    --color-text-muted: #a0aec0;
  }

  body {
    background-color: #1a202c;
    color: var(--color-text-dark);
  }

  section {
    background-color: #2d3748;
  }

  .character-display {
    background-color: #1a202c;
  }

  .btn-outline {
    background-color: #2d3748;
    color: var(--color-text-dark);
  }
}
*/

/* 打印样式 */
@media print {
  .controls,
  footer,
  .breadcrumb {
    display: none;
  }

  .character-hero {
    background: none;
    color: black;
  }

  section {
    box-shadow: none;
    border: 1px solid #ccc;
  }
}