/**
 * LeadSync Design System 2026
 * CSS Custom Properties & Design Tokens
 */

:root {
  /* ========================================
     COLORS
     ======================================== */

  /* Primary Brand Colors */
  --ls-primary: #0F172A;          /* Deep navy */
  --ls-primary-light: #1E293B;    /* Slate for cards */
  --ls-primary-lighter: #334155;  /* Lighter slate */
  --ls-accent: #3B82F6;           /* Bright blue CTAs */
  --ls-accent-hover: #2563EB;     /* Darker blue on hover */
  --ls-accent-light: #60A5FA;     /* Light blue for highlights */

  /* Success/Status Colors */
  --ls-success: #10B981;          /* Emerald green */
  --ls-success-light: #34D399;
  --ls-warning: #F59E0B;          /* Amber */
  --ls-error: #EF4444;            /* Red */

  /* Platform Brand Colors */
  --ls-facebook: #1877F2;
  --ls-instagram: #E4405F;
  --ls-tiktok: #000000;
  --ls-linkedin: #0A66C2;
  --ls-google: #4285F4;

  /* Neutrals */
  --ls-white: #FFFFFF;
  --ls-gray-50: #F8FAFC;
  --ls-gray-100: #F1F5F9;
  --ls-gray-200: #E2E8F0;
  --ls-gray-300: #CBD5E1;
  --ls-gray-400: #94A3B8;
  --ls-gray-500: #64748B;
  --ls-gray-600: #475569;
  --ls-gray-700: #334155;
  --ls-gray-800: #1E293B;
  --ls-gray-900: #0F172A;

  /* Gradients */
  --ls-gradient-hero: linear-gradient(135deg, #0F172A 0%, #1E293B 100%);
  --ls-gradient-cta: linear-gradient(135deg, #3B82F6 0%, #1D4ED8 100%);
  --ls-gradient-accent: linear-gradient(90deg, #60A5FA, #34D399);

  /* ========================================
     TYPOGRAPHY
     ======================================== */

  /* Font Families */
  --ls-font-heading: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --ls-font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --ls-font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Fluid Font Sizes */
  --ls-text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);      /* 12-14px */
  --ls-text-sm: clamp(0.875rem, 0.8rem + 0.375vw, 1rem);        /* 14-16px */
  --ls-text-base: clamp(1rem, 0.9rem + 0.5vw, 1.125rem);        /* 16-18px */
  --ls-text-lg: clamp(1.125rem, 1rem + 0.625vw, 1.25rem);       /* 18-20px */
  --ls-text-xl: clamp(1.25rem, 1.1rem + 0.75vw, 1.5rem);        /* 20-24px */
  --ls-text-2xl: clamp(1.5rem, 1.25rem + 1.25vw, 2rem);         /* 24-32px */
  --ls-text-3xl: clamp(1.875rem, 1.5rem + 1.875vw, 2.5rem);     /* 30-40px */
  --ls-text-4xl: clamp(2.25rem, 1.75rem + 2.5vw, 3.5rem);       /* 36-56px */
  --ls-text-5xl: clamp(3rem, 2rem + 5vw, 4.5rem);               /* 48-72px */

  /* Font Weights */
  --ls-weight-regular: 400;
  --ls-weight-medium: 500;
  --ls-weight-semibold: 600;
  --ls-weight-bold: 700;

  /* Line Heights */
  --ls-leading-tight: 1.1;
  --ls-leading-snug: 1.25;
  --ls-leading-normal: 1.5;
  --ls-leading-relaxed: 1.625;

  /* Letter Spacing */
  --ls-tracking-tight: -0.025em;
  --ls-tracking-normal: 0;
  --ls-tracking-wide: 0.025em;

  /* ========================================
     SPACING (8px base)
     ======================================== */
  --ls-space-1: 0.25rem;   /* 4px */
  --ls-space-2: 0.5rem;    /* 8px */
  --ls-space-3: 0.75rem;   /* 12px */
  --ls-space-4: 1rem;      /* 16px */
  --ls-space-5: 1.25rem;   /* 20px */
  --ls-space-6: 1.5rem;    /* 24px */
  --ls-space-8: 2rem;      /* 32px */
  --ls-space-10: 2.5rem;   /* 40px */
  --ls-space-12: 3rem;     /* 48px */
  --ls-space-16: 4rem;     /* 64px */
  --ls-space-20: 5rem;     /* 80px */
  --ls-space-24: 6rem;     /* 96px */
  --ls-space-32: 8rem;     /* 128px */

  /* ========================================
     BORDERS & RADIUS
     ======================================== */
  --ls-radius-sm: 0.25rem;    /* 4px */
  --ls-radius-md: 0.5rem;     /* 8px */
  --ls-radius-lg: 0.75rem;    /* 12px */
  --ls-radius-xl: 1rem;       /* 16px */
  --ls-radius-2xl: 1.5rem;    /* 24px */
  --ls-radius-full: 9999px;

  --ls-border-width: 1px;
  --ls-border-color: var(--ls-gray-200);

  /* ========================================
     SHADOWS
     ======================================== */
  --ls-shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --ls-shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --ls-shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --ls-shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --ls-shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
  --ls-shadow-glow: 0 0 40px rgb(59 130 246 / 0.3);

  /* ========================================
     TRANSITIONS
     ======================================== */
  --ls-transition-fast: 150ms ease;
  --ls-transition-base: 200ms ease;
  --ls-transition-slow: 300ms ease;
  --ls-transition-slower: 500ms ease;

  /* Custom Bezier Curves */
  --ls-ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ls-ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);

  /* ========================================
     Z-INDEX SCALE
     ======================================== */
  --ls-z-base: 0;
  --ls-z-above: 10;
  --ls-z-dropdown: 100;
  --ls-z-sticky: 200;
  --ls-z-overlay: 300;
  --ls-z-modal: 400;
  --ls-z-toast: 500;

  /* ========================================
     BREAKPOINTS (for reference)
     ======================================== */
  --ls-breakpoint-sm: 640px;
  --ls-breakpoint-md: 768px;
  --ls-breakpoint-lg: 1024px;
  --ls-breakpoint-xl: 1280px;
  --ls-breakpoint-2xl: 1536px;

  /* ========================================
     CONTAINER
     ======================================== */
  --ls-container-sm: 640px;
  --ls-container-md: 768px;
  --ls-container-lg: 1024px;
  --ls-container-xl: 1200px;
  --ls-container-2xl: 1400px;
}

/* ========================================
   BASE RESETS & UTILITIES
   ======================================== */

/* Box sizing */
*, *::before, *::after {
  box-sizing: border-box;
}

/* Remove default margin/padding */
* {
  margin: 0;
  padding: 0;
}

/* Smooth scrolling */
html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography defaults */
body {
  font-family: var(--ls-font-body);
  font-size: var(--ls-text-base);
  line-height: var(--ls-leading-normal);
  color: var(--ls-gray-900);
  background-color: var(--ls-white);
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--ls-font-heading);
  font-weight: var(--ls-weight-bold);
  line-height: var(--ls-leading-tight);
  letter-spacing: var(--ls-tracking-tight);
}

/* Links */
a {
  color: var(--ls-accent);
  text-decoration: none;
  transition: color var(--ls-transition-fast);
}

a:hover {
  color: var(--ls-accent-hover);
}

/* Images */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Buttons reset */
button {
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* Focus styles for accessibility */
:focus-visible {
  outline: 2px solid var(--ls-accent);
  outline-offset: 2px;
}

/* ========================================
   UTILITY CLASSES
   ======================================== */

/* Container */
.ls-container {
  width: 100%;
  max-width: var(--ls-container-xl);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--ls-space-4);
  padding-right: var(--ls-space-4);
}

@media (min-width: 768px) {
  .ls-container {
    padding-left: var(--ls-space-6);
    padding-right: var(--ls-space-6);
  }
}

@media (min-width: 1024px) {
  .ls-container {
    padding-left: var(--ls-space-8);
    padding-right: var(--ls-space-8);
  }
}

/* Text utilities */
.ls-text-center { text-align: center; }
.ls-text-left { text-align: left; }
.ls-text-right { text-align: right; }

/* Display utilities */
.ls-flex { display: flex; }
.ls-grid { display: grid; }
.ls-hidden { display: none; }

/* Flex utilities */
.ls-items-center { align-items: center; }
.ls-justify-center { justify-content: center; }
.ls-justify-between { justify-content: space-between; }
.ls-flex-col { flex-direction: column; }
.ls-flex-wrap { flex-wrap: wrap; }
.ls-gap-2 { gap: var(--ls-space-2); }
.ls-gap-4 { gap: var(--ls-space-4); }
.ls-gap-6 { gap: var(--ls-space-6); }
.ls-gap-8 { gap: var(--ls-space-8); }

/* Spacing utilities */
.ls-mt-4 { margin-top: var(--ls-space-4); }
.ls-mt-8 { margin-top: var(--ls-space-8); }
.ls-mb-4 { margin-bottom: var(--ls-space-4); }
.ls-mb-8 { margin-bottom: var(--ls-space-8); }
.ls-py-16 { padding-top: var(--ls-space-16); padding-bottom: var(--ls-space-16); }
.ls-py-24 { padding-top: var(--ls-space-24); padding-bottom: var(--ls-space-24); }

/* Screen reader only */
.ls-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}