/* =============================================
   BankQR Design Tokens
   Adapted from VOS Design Skill
   ============================================= */

:root {
  /* === Colors — Light Theme (Nếp-inspired warm cream) === */
  --bg-base: #F6F6F4;
  --bg-surface: #FFFFFF;
  --bg-surface-l2: #F0EFED;
  --bg-hover: #E8E7E5;
  --bg-overlay: rgba(0, 0, 0, 0.4);

  --text-primary: #212B3A;
  --text-secondary: #6B7280;
  --text-tertiary: #9CA3AF;
  --text-accent: #B8860B;
  --text-danger: #EF4444;
  --text-success: #10B981;
  --text-warning: #F59E0B;
  --text-on-dark: #FFFFFF;

  --accent-primary: #212B3A;
  --accent-primary-fg: #FFFFFF;
  --accent-success: #10B981;
  --accent-danger: #EF4444;
  --accent-warning: #F59E0B;

  /* === Typography === */
  --font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display",
                 "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --fs-xs: 11px;
  --fs-sm: 13px;
  --fs-base: 15px;
  --fs-md: 17px;
  --fs-lg: 20px;
  --fs-xl: 22px;
  --fs-2xl: 28px;
  --fs-3xl: 34px;
  --fw-normal: 400;
  --fw-medium: 500;
  --fw-semibold: 600;
  --fw-bold: 700;
  --lh-tight: 1.2;
  --lh-normal: 1.5;

  /* === Spacing === */
  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 20px;
  --sp-6: 24px;
  --sp-8: 32px;
  --sp-10: 40px;
  --sp-12: 48px;

  /* === Borders & Radius === */
  --radius-xs: 6px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 9999px;
  --border-color: rgba(0, 0, 0, 0.06);
  --border-color-strong: rgba(0, 0, 0, 0.1);

  /* === Shadows === */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.03);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.08);
  --shadow-xl: 0 12px 40px rgba(0, 0, 0, 0.12);
  --shadow-nav: 0 -2px 12px rgba(0, 0, 0, 0.05);

  /* === Layout === */
  --touch-min: 44px;
  --nav-height: 56px;
  --fab-size: 56px;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-left: env(safe-area-inset-left, 0px);
  --safe-right: env(safe-area-inset-right, 0px);
  --content-px: var(--sp-4);

  /* === Transitions === */
  --ease-out: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --duration-slow: 400ms;
}