/* ================================================================
   theme.css — Material Design 3 色彩体系 + CSS变量
   Legado 3.0 设计语言集成
   ================================================================ */

:root {
  /* === Material Design 3 主色调 === */
  --md-primary: #6750A4;
  --md-on-primary: #FFFFFF;
  --md-primary-container: #EADDFF;
  --md-on-primary-container: #21005D;
  --md-primary-fixed: #EADDFF;
  --md-primary-fixed-dim: #D0BCFF;

  /* === Material Design 3 次要色 === */
  --md-secondary: #625B71;
  --md-on-secondary: #FFFFFF;
  --md-secondary-container: #E8DEF8;
  --md-on-secondary-container: #1D192B;

  /* === Material Design 3 第三色 === */
  --md-tertiary: #7D5260;
  --md-on-tertiary: #FFFFFF;
  --md-tertiary-container: #FFD8E4;
  --md-on-tertiary-container: #31111D;

  /* === Material Design 3 表面色 === */
  --md-surface: #FFFBFE;
  --md-surface-dim: #DED8E1;
  --md-surface-bright: #FFFBFE;
  --md-surface-container-lowest: #FFFFFF;
  --md-surface-container-low: #F7F2FA;
  --md-surface-container: #F3EDF7;
  --md-surface-container-high: #ECE6F0;
  --md-surface-container-highest: #E6E0E9;

  /* === Material Design 3 背景色 === */
  --md-background: #FFFBFE;
  --md-on-background: #1C1B1F;

  /* === Material Design 3 表面变体 === */
  --md-surface-variant: #E7E0EC;
  --md-on-surface-variant: #49454F;
  --md-outline: #79747E;
  --md-outline-variant: #CAC4D0;

  /* === Material Design 3 语义色 === */
  --md-error: #B3261E;
  --md-on-error: #FFFFFF;
  --md-error-container: #F9DEDC;
  --md-on-error-container: #410E0B;

  /* === 项目语义色 === */
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-danger: #EF4444;
  --color-info: #3B82F6;
  --color-purple: #8B5CF6;

  /* === 温度色阶（6级） === */
  --temp-searing: #FF4500;
  --temp-hot: #FF8C00;
  --temp-warm: #FFD700;
  --temp-normal: #62A0EA;
  --temp-cool: #1A5FB4;
  --temp-frozen: #6B7280;

  /* === 学科颜色 === */
  --subj-math: #6366F1;
  --subj-chinese: #EC4899;
  --subj-english: #3B82F6;
  --subj-physics: #F59E0B;
  --subj-chemistry: #10B981;
  --subj-biology: #22D3EE;
  --subj-politics: #EF4444;
  --subj-history: #8B5CF6;
  --subj-geography: #14B8A6;

  /* === 排版 === */
  --font-sans: 'Roboto', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

  --text-display-large: 57px;
  --text-display-medium: 45px;
  --text-display-small: 36px;
  --text-headline-large: 32px;
  --text-headline-medium: 28px;
  --text-headline-small: 24px;
  --text-title-large: 22px;
  --text-title-medium: 16px;
  --text-title-small: 14px;
  --text-label-large: 14px;
  --text-label-medium: 12px;
  --text-label-small: 11px;
  --text-body-large: 16px;
  --text-body-medium: 14px;
  --text-body-small: 12px;

  /* === 圆角系统（Material Design Shape） === */
  --radius-none: 0;
  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-2xl: 28px;
  --radius-full: 9999px;

  /* === 阴影系统（Material Design Elevation） === */
  --elevation-0: none;
  --elevation-1: 0 1px 2px rgba(0,0,0,0.3), 0 1px 3px 1px rgba(0,0,0,0.15);
  --elevation-2: 0 1px 2px rgba(0,0,0,0.3), 0 2px 6px 2px rgba(0,0,0,0.15);
  --elevation-3: 0 4px 8px 3px rgba(0,0,0,0.15), 0 1px 3px rgba(0,0,0,0.3);
  --elevation-4: 0 6px 10px 4px rgba(0,0,0,0.15), 0 2px 3px rgba(0,0,0,0.3);
  --elevation-5: 0 8px 12px 6px rgba(0,0,0,0.15), 0 4px 4px rgba(0,0,0,0.3);

  /* === 动画 === */
  --ease-standard: cubic-bezier(0.2, 0, 0, 1);
  --ease-emphasized: cubic-bezier(0.05, 0.7, 0.1, 1);
  --ease-decelerate: cubic-bezier(0, 0, 0, 1);
  --ease-accelerate: cubic-bezier(0.3, 0, 1, 1);
  --duration-short: 150ms;
  --duration-medium: 300ms;
  --duration-long: 500ms;
  --duration-extra-long: 800ms;

  /* === 间距 === */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;

  /* === 导航尺寸 === */
  --nav-height: 64px;
  --header-height: 56px;
  --fab-size: 56px;
}

/* ================================================================
   深色模式
   ================================================================ */
[data-theme="dark"] {
  --md-primary: #D0BCFF;
  --md-on-primary: #381E72;
  --md-primary-container: #4F378B;
  --md-on-primary-container: #EADDFF;
  --md-primary-fixed: #EADDFF;
  --md-primary-fixed-dim: #D0BCFF;

  --md-secondary: #CCC2DC;
  --md-on-secondary: #332D41;
  --md-secondary-container: #4A4458;
  --md-on-secondary-container: #E8DEF8;

  --md-tertiary: #EFB8C8;
  --md-on-tertiary: #492532;
  --md-tertiary-container: #633B48;
  --md-on-tertiary-container: #FFD8E4;

  --md-surface: #1C1B1F;
  --md-surface-dim: #141218;
  --md-surface-bright: #3B383E;
  --md-surface-container-lowest: #0F0D13;
  --md-surface-container-low: #1D1B20;
  --md-surface-container: #211F26;
  --md-surface-container-high: #2B2930;
  --md-surface-container-highest: #36343B;

  --md-background: #1C1B1F;
  --md-on-background: #E6E1E5;

  --md-surface-variant: #49454F;
  --md-on-surface-variant: #CAC4D0;
  --md-outline: #938F99;
  --md-outline-variant: #49454F;

  --md-error: #F2B8B5;
  --md-on-error: #601410;
  --md-error-container: #8C1D18;
  --md-on-error-container: #F9DEDC;

  --elevation-1: 0 1px 2px rgba(0,0,0,0.3), 0 1px 3px 1px rgba(0,0,0,0.15);
  --elevation-2: 0 1px 2px rgba(0,0,0,0.3), 0 2px 6px 2px rgba(0,0,0,0.15);
  --elevation-3: 0 4px 8px 3px rgba(0,0,0,0.15), 0 1px 3px rgba(0,0,0,0.3);
  --elevation-4: 0 6px 10px 4px rgba(0,0,0,0.15), 0 2px 3px rgba(0,0,0,0.3);
  --elevation-5: 0 8px 12px 6px rgba(0,0,0,0.15), 0 4px 4px rgba(0,0,0,0.3);
}

/* ================================================================
   主题切换过渡动画
   ================================================================ */
.theme-transitioning,
.theme-transitioning *,
.theme-transitioning *::before,
.theme-transitioning *::after {
  transition: background-color 0.3s var(--ease-standard),
              color 0.3s var(--ease-standard),
              border-color 0.3s var(--ease-standard),
              box-shadow 0.3s var(--ease-standard) !important;
}

/* ================================================================
   全局重置
   ================================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-body-medium);
  background: var(--md-background);
  color: var(--md-on-background);
  line-height: 1.6;
  min-height: 100vh;
  min-height: 100dvh;
  overflow-x: hidden;
  overflow-y: auto;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--md-primary); text-decoration: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; }
input, textarea, select { font-family: inherit; font-size: inherit; }

::-webkit-scrollbar { width: 4px; height: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(0,0,0,0.15); border-radius: 4px; }
[data-theme="dark"] ::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); }