/* =========================================
   MAIN.CSS — Variables, Reset, Base Styles
   ========================================= */

/* --- Custom Properties --- */
:root {
  /* Color — green primary + muted grays */
  --color-primary:       #1e6b45;
  --color-primary-dark:  #155538;
  --color-primary-light: #edf5f0;
  --color-dark:          #252524;
  --color-gray:          #6b6b68;
  --color-light-bg:      #f2f2f0;
  --color-white:         #ffffff;
  --color-border:        #cccbc5;
  --color-footer-bg:     #1a1a18;

  /* Typography */
  --font-primary: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-size-base: 1rem;
  --line-height-base: 1.7;

  /* Layout */
  --container-max: 1200px;
  --container-padding: 1.5rem;
  --header-height: 116px;

  /* Radius */
  --radius-sm: 3px;
  --radius-md: 6px;
  --radius-lg: 12px;

  /* Shadows — neutral, not colored */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.07);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.09);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);

  --transition: 0.22s ease;
}

/* --- Reset --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--color-dark);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover { color: var(--color-primary-dark); }

ul { list-style: none; }

/* --- Focus visible — accesibilidad --- */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* --- Container --- */
.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-padding);
}

/* --- Section Base --- */
.section {
  padding-block: 5rem;
}

.section--bg {
  background-color: var(--color-light-bg);
}

.section__header {
  text-align: center;
  margin-bottom: 3.5rem;
}

.section__label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
}

.section__title {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 700;
  color: var(--color-dark);
  line-height: 1.25;
}

.section__subtitle {
  font-size: 1.05rem;
  color: var(--color-gray);
  margin-top: 1rem;
  max-width: 600px;
  margin-inline: auto;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 1.875rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: 2px solid transparent;
  transition:
    background-color var(--transition),
    color var(--transition),
    border-color var(--transition),
    box-shadow var(--transition),
    transform var(--transition);
  line-height: 1;
}

.btn:active { transform: translateY(1px); }

.btn--primary {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.btn--primary:hover {
  background-color: var(--color-primary-dark);
  color: var(--color-white);
  box-shadow: 0 4px 14px rgba(30,107,69,0.30);
}

.btn--outline {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn--outline:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.btn--ghost {
  background-color: transparent;
  color: var(--color-dark);
  border-color: var(--color-border);
}

.btn--ghost:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn--white {
  background-color: var(--color-white);
  color: var(--color-primary);
}

.btn--white:hover {
  background-color: var(--color-primary-light);
  color: var(--color-primary-dark);
}

.btn--sm {
  padding: 0.55rem 1.1rem;
  font-size: 0.85rem;
}

.btn--lg {
  padding: 1rem 2.25rem;
  font-size: 1rem;
}

/* --- Utilities --- */
.text-center { text-align: center; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
}