/* 1. RESET & BOX-SIZING */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* 2. ROOT VARIABLES (THEME) */
:root {
  /* Colors */
  --color-primary: #0d6efd;
  --color-secondary: #6c757d;
  --color-light: #f8f9fa;
  --color-dark: #000000;
  --color-success: #198754;
  --color-danger: #dc3545;

  /* Typography */
  --font-sans: "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-serif: Georgia, "Times New Roman", Times, serif;
  --base-font-size: 1rem; /* 16px */
  --heading-weight: 700;
  --body-weight: 400;

  /* Spacing */
  --section-padding-y: 4rem;
}

/* 3. BASE TYPOGRAPHY */
html {
  font-family: var(--font-sans);
  font-size: var(--base-font-size);
  scroll-behavior: smooth;
  color: var(--color-dark);
}

body {
  line-height: 1.6;
  font-weight: var(--body-weight);
  background-color: #fff;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--heading-weight);
  line-height: 1.2;
  margin-bottom: 1rem;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }

/* Paragraphs */
p {
  margin-bottom: 1rem;
  color: #000000;
}

/* 4. LINKS & BUTTONS */
a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color .2s;
}
a:hover,
a:focus {
  color: var(--color-primary);
  text-decoration: underline;
}

.btn-primary {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
}
.btn-primary:hover {
  background-color: darken(var(--color-primary), 10%);
  border-color: darken(var(--color-primary), 10%);
}

/* 5. CONTAINERS & SECTIONS */
.container {
  max-width: 1140px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1rem;
  padding-right: 1rem;
}

section {
  padding-top: var(--section-padding-y);
  padding-bottom: var(--section-padding-y);
  min-height: 100vh;
  width: 100%;
  position: relative;

}

/* 6. CUSTOM UTILITIES */
.text-center {
  text-align: center !important;
}

.mt-5 {
  margin-top: 3rem !important;
}

.mb-5 {
  margin-bottom: 3rem !important;
}

/* 7. OVERRIDES FOR BOOTSTRAP DEFAULTS */
.bg-light {
  background-color: var(--color-light) !important;
}

.bg-dark {
  background-color: var(--color-dark) !important;
}
.text-white {
  color: #fff !important;
}

/* 8. RESPONSIVE TYPOGRAPHY (optional) */
@media (min-width: 768px) {
  h1 { font-size: 3rem; }
  h2 { font-size: 2.5rem; }
}