/* ===========================================================================
   销售 AI · Typography tokens
   Plus Jakarta Sans for everything UI; Space Grotesk reserved for numerics
   (timers, percentages, dates, the "9:41" clock, step-number badges).
   CJK gracefully falls back to the platform's system sans.
   =========================================================================== */
:root {
  /* ---- Families --------------------------------------------------------- */
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont,
               'PingFang SC', 'Microsoft YaHei', 'Noto Sans CJK SC', sans-serif;
  --font-numeric: 'Space Grotesk', 'Plus Jakarta Sans', ui-monospace,
               'PingFang SC', sans-serif;

  /* ---- Type scale (px) — observed in product ---------------------------- */
  --text-display: 46px;   /* marketing / page H1                            */
  --text-h1: 25px;        /* screen hero title (empty state)                */
  --text-h2: 22px;        /* sheet / dialog title                          */
  --text-h3: 19px;        /* card title, read-aloud script                 */
  --text-lg: 17px;        /* lead paragraph                                */
  --text-button: 16.5px;  /* primary button label                          */
  --text-base: 16px;      /* nav title, default body                       */
  --text-md: 15px;        /* body                                          */
  --text-sm: 14px;        /* secondary body, list rows                     */
  --text-xs: 13px;        /* captions, status-pill, meta                   */
  --text-2xs: 12px;       /* fine labels                                   */
  --text-3xs: 11px;       /* step labels, micro-meta                       */

  /* ---- Weights ---------------------------------------------------------- */
  --weight-regular: 400;
  --weight-medium: 500;
  --weight-semibold: 600;
  --weight-bold: 700;
  --weight-extrabold: 800;   /* hero titles, primary numerics              */

  /* ---- Line heights ----------------------------------------------------- */
  --leading-tight: 1.1;      /* display / hero                              */
  --leading-snug: 1.35;
  --leading-normal: 1.55;
  --leading-body: 1.65;      /* descriptive paragraphs                      */
  --leading-relaxed: 1.72;   /* read-aloud script                          */

  /* ---- Letter spacing --------------------------------------------------- */
  --tracking-display: -0.02em;  /* large headings                           */
  --tracking-tight: -0.01em;    /* sub-headings                             */
  --tracking-normal: 0;
  --tracking-wide: 0.02em;      /* status pills                             */
  --tracking-caps: 0.04em;      /* small uppercase-ish labels               */
}