/* ===================================================================
 * serene · 静谧 · 设计令牌
 * 气质:安静、沉思、冥想、如夜空般的深邃平静
 * 适合:冥想App/瑜伽/心理健康/深度阅读/睡眠
 * =================================================================== */
:root {
  --color-primary: #5B7C99;            /* 静谧蓝灰,如夜空将明 */
  --color-primary-soft: rgba(91, 124, 153, 0.1);
  --color-secondary: #8FA8B8;          /* 雾灰蓝 */

  --color-bg: #F2F4F7;                /* 极浅冷灰,宁静 */
  --color-card: #FFFFFF;
  --color-border: #E1E6EC;

  --color-text: #2E3A47;              /* 深岩灰 */
  --color-text-secondary: #5B6B7C;
  --color-text-muted: #94A3B0;
  --color-text-disabled: #C4CDD5;
  --color-text-inverse: #FFFFFF;

  --color-success: #6B9E8C;
  --color-warning: #C9A86A;
  --color-error: #A86B6B;
  --color-info: #5B7C99;

  --font-heading: 'Cormorant Garamond', 'Noto Serif SC', serif;  /* 细瘦衬线,沉思 */
  --font-body: 'Inter', 'PingFang SC', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --font-size-xs: 0.75rem; --font-size-sm: 0.875rem; --font-size-base: 1.0625rem;
  --font-size-lg: 1.25rem; --font-size-xl: 1.875rem; --font-size-2xl: 2.5rem; --font-size-3xl: 3.75rem;

  --font-weight-regular: 300; --font-weight-medium: 400; --font-weight-semibold: 500; --font-weight-bold: 600;

  --line-height-tight: 1.3; --line-height-normal: 1.8; --line-height-relaxed: 2.0;
  --letter-spacing-tight: -0.01em; --letter-spacing-normal: 0; --letter-spacing-wide: 0.12em;

  --space-page-x: 32px; --space-section: 96px; --space-card-pad: 32px;

  --radius-none: 0; --radius-sm: 8px; --radius-md: 16px; --radius-lg: 24px; --radius-full: 9999px;
  --border-width-thin: 1px; --border-width-normal: 1px;

  --shadow-sm: 0 2px 8px rgba(46,58,71,0.04);
  --shadow-md: 0 6px 20px rgba(46,58,71,0.06);
  --shadow-lg: 0 12px 36px rgba(46,58,71,0.08);

  --motion-duration-fast: 300ms; --motion-duration-normal: 600ms; --motion-duration-slow: 1000ms;  /* 慢,静 */
  --motion-easing-standard: cubic-bezier(0.16, 1, 0.3, 1);
  --motion-easing-decelerate: cubic-bezier(0, 0, 0.2, 1);
  --motion-easing-spring: cubic-bezier(0.16, 1, 0.3, 1);

  --container-max: 900px;  /* 窄,聚焦沉思 */
  --ratio-card: 4 / 3;
  --color-code-bg: #2E3A47; --color-code-text: #F2F4F7;
}