/* ===================================================================
   PAGEFPT DESIGN SYSTEM TOKENS
   Inspired by modern telecom & high-converting SaaS aesthetics
   Optimized for Vietnamese typography (Be Vietnam Pro) & Mobile-first
   =================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:ital,wght@0,300;0,400;0,500;0,600;0,700;0,800;1,400;1,600&display=swap');

:root {
  /* Brand Identity - FPT Telecom Signature */
  --color-primary: #F26F21;
  --color-primary-hover: #FF7A29;
  --color-primary-active: #E05A10;
  --color-primary-subtle: #FFF3EB;
  --color-primary-glow: rgba(242, 111, 33, 0.25);

  --color-secondary: #0066B3;
  --color-secondary-hover: #005291;
  --color-secondary-subtle: #EBF4FC;

  /* Tech Accents & Indicators */
  --color-accent: #0284C7;
  --color-success: #10B981;
  --color-success-subtle: #ECFDF5;
  --color-success-text: #065F46;

  --color-warning: #F59E0B;
  --color-warning-subtle: #FFFBEB;
  --color-warning-text: #92400E;

  --color-danger: #EF4444;
  --color-danger-subtle: #FEF2F2;
  --color-danger-text: #991B1B;

  /* Neutral Spectrum (Light Mode) */
  --bg-app: #F8FAFC;
  --bg-surface: #FFFFFF;
  --bg-surface-elevated: #FFFFFF;
  --bg-surface-muted: #F1F5F9;
  --bg-glass: rgba(255, 255, 255, 0.88);
  --border-glass: rgba(255, 255, 255, 0.6);

  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-muted: #94A3B8;
  --text-inverted: #FFFFFF;

  --border-subtle: #E2E8F0;
  --border-strong: #CBD5E1;
  --border-focus: #F26F21;

  /* Elevation & Shadows */
  --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.05);
  --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 4px 12px -2px rgba(15, 23, 42, 0.08), 0 2px 6px -1px rgba(15, 23, 42, 0.05);
  --shadow-lg: 0 12px 24px -4px rgba(15, 23, 42, 0.12), 0 4px 8px -2px rgba(15, 23, 42, 0.06);
  --shadow-xl: 0 20px 32px -8px rgba(15, 23, 42, 0.16), 0 8px 16px -4px rgba(15, 23, 42, 0.08);
  --shadow-glow: 0 0 24px var(--color-primary-glow);

  /* Typography */
  --font-family-base: 'Be Vietnam Pro', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px - CRITICAL: prevents iOS Safari auto-zoom */
  --font-size-md: 1.125rem;   /* 18px */
  --font-size-lg: 1.25rem;    /* 20px */
  --font-size-xl: 1.5rem;     /* 24px */
  --font-size-2xl: 1.875rem;  /* 30px */
  --font-size-3xl: 2.25rem;   /* 36px */

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;

  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.65;

  /* Spacing Scale */
  --space-1: 0.25rem;  /* 4px */
  --space-2: 0.5rem;   /* 8px */
  --space-3: 0.75rem;  /* 12px */
  --space-4: 1rem;     /* 16px */
  --space-5: 1.25rem;  /* 20px */
  --space-6: 1.5rem;   /* 24px */
  --space-8: 2rem;     /* 32px */
  --space-10: 2.5rem;  /* 40px */
  --space-12: 3rem;    /* 48px */
  --space-16: 4rem;    /* 64px */

  /* Border Radii */
  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Layout Containers */
  --max-width-mobile: 480px;
  --max-width-tablet: 768px;
  --max-width-desktop: 1200px;
  --max-width-admin: 1440px;

  /* Mobile Touch & Safe Areas */
  --min-touch-target: 48px;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-top: env(safe-area-inset-top, 0px);

  /* Transitions & Animation Physics */
  --ease-snappy: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --duration-slow: 400ms;

  /* Glassmorphism */
  --glass-blur: blur(16px);
  --glass-border: 1px solid var(--border-glass);
}

/* Dark Mode Tokens (Admin & Dark preferences) */
[data-theme="dark"] {
  --bg-app: #0B1120;
  --bg-surface: #0F172A;
  --bg-surface-elevated: #1E293B;
  --bg-surface-muted: #1E293B;
  --bg-glass: rgba(15, 23, 42, 0.85);
  --border-glass: rgba(255, 255, 255, 0.08);

  --text-primary: #F8FAFC;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  --text-inverted: #0F172A;

  --border-subtle: #1E293B;
  --border-strong: #334155;

  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 12px -2px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 12px 24px -4px rgba(0, 0, 0, 0.6);
  --shadow-xl: 0 20px 32px -8px rgba(0, 0, 0, 0.7);

  --color-primary-subtle: rgba(242, 111, 33, 0.15);
  --color-secondary-subtle: rgba(0, 102, 179, 0.15);
  --color-success-subtle: rgba(16, 185, 129, 0.15);
  --color-success-text: #34D399;
}