/* ── 牧牧工作室 · 品牌主题系统 ── */
/* 设计羊 UI 规格 v1.0 */

:root {
  /* 品牌色板 */
  --color-brand: #D4A574;
  --color-green: #8BB87C;
  --color-blue: #7EB8DA;
  --color-brown-dark: #A0785A;

  /* 学科色 */
  --color-english: #7EB8DA;
  --color-english-deep: #5B9EC2;
  --color-english-light: rgba(126, 184, 218, 0.2);
  --color-math: #8BB87C;
  --color-math-deep: #6B9A5C;
  --color-math-light: rgba(139, 184, 124, 0.2);
  --color-history: #D4A574;
  --color-history-deep: #B0845C;
  --color-history-light: rgba(212, 165, 116, 0.2);

  /* 文字色 */
  --text-primary: #3D3226;
  --text-secondary: #6B5D4F;
  --text-tertiary: #9B8D7F;

  /* 背景 */
  --bg-page: #FDF8F1;
  --bg-card: #FFFFFF;
  --bg-card-hover: #FFFBF5;
  --border-card: rgba(212, 165, 116, 0.12);

  /* 阴影 */
  --shadow-card: 0 2px 8px rgba(212, 165, 116, 0.08);
  --shadow-hover: 0 4px 16px rgba(212, 165, 116, 0.12);
  --shadow-tooltip: 0 4px 16px rgba(0, 0, 0, 0.1);

  /* 圆角 */
  --radius-card: 12px;
  --radius-button: 8px;
  --radius-chart: 16px;
  --radius-pill: 20px;

  /* 动效 */
  --transition-fast: 200ms ease-out;
  --transition-slow: 400ms ease-out;

  /* 导航 */
  --nav-height: 56px;
  --nav-bg: rgba(253, 248, 241, 0.92);
  --nav-border: rgba(212, 165, 116, 0.15);
  --bottom-nav-height: 0px;
}

/* ── 深色模式 ── */
[data-theme="dark"] {
  --text-primary: #F0EDE8;
  --text-secondary: #C5BFB5;
  --text-tertiary: #8A8480;
  --bg-page: #1E1B18;
  --bg-card: rgba(255, 255, 255, 0.03);
  --bg-card-hover: rgba(255, 255, 255, 0.06);
  --border-card: rgba(255, 255, 255, 0.06);
  --shadow-card: 0 0 0 1px rgba(255, 255, 255, 0.04), 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 0 0 1px rgba(255, 255, 255, 0.06), 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-tooltip: 0 4px 16px rgba(0, 0, 0, 0.4);
  --nav-bg: rgba(30, 27, 24, 0.92);
  --nav-border: rgba(255, 255, 255, 0.06);
}

/* ── 全局重置 ── */
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: 'Noto Sans SC', 'PingFang SC', -apple-system, sans-serif;
  background: var(--bg-page);
  color: var(--text-primary);
  min-height: 100vh;
  min-height: 100dvh; /* iOS Safari 动态视口，避免地址栏遮挡 */
  transition: background var(--transition-slow), color var(--transition-slow);
  padding-top: var(--nav-height);
  padding-bottom: var(--bottom-nav-height);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overscroll-behavior: none; /* 禁止 iOS 橡皮筋回弹露出白色背景 */
  -webkit-overflow-scrolling: touch;
}
/* iOS safe-area：底部加安全区 */
@supports (padding-bottom: env(safe-area-inset-bottom)) {
  body {
    padding-bottom: calc(var(--bottom-nav-height) + env(safe-area-inset-bottom));
  }
}

/* ── 页码主容器 ── */
.page-container {
  max-width: 1050px;
  margin: 0 auto;
  padding: 1rem;
}

/* ── 页面标题 ── */
.page-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-bottom: 1.5rem;
}
.section-title {
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: -0.3px;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--border-card);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

/* ── 焦点状态 ── */
:focus-visible {
  outline: 2px solid var(--color-brand);
  outline-offset: 2px;
}

/* ── 动效降级 ── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ── 响应式 ── */
@media (max-width: 640px) {
  .page-title { font-size: 1.2rem; }
}