/* css/base.css — Base styles, typography, layout primitives */
@layer base {
  html {
    font-size: 16px;
  }

  body {
    font-family: var(--font-body);
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    transition: background-color var(--transition-base), color var(--transition-base);
  }

  h1, h2, h3, h4 {
    font-family: var(--font-heading);
    line-height: 1.2;
    color: var(--color-text-primary);
  }

  h1 { font-size: clamp(2rem, 5vw, 3.5rem); font-weight: 700; }
  h2 { font-size: clamp(1.6rem, 3.5vw, 2.5rem); font-weight: 600; }
  h3 { font-size: clamp(1.2rem, 2.5vw, 1.6rem); font-weight: 600; }
  h4 { font-size: clamp(1rem, 2vw, 1.2rem); font-weight: 600; }

  p {
    line-height: 1.7;
    color: var(--color-text-secondary);
  }

  /* --- Layout Primitives --- */
  .container {
    width: 100%;
    max-width: var(--max-width);
    margin-inline: auto;
    padding-inline: clamp(1rem, 5vw, 1.5rem);
  }

  .section-padding {
    padding-block: clamp(3rem, 8vw, 5rem);
  }

  .section-header {
    text-align: center;
    margin-bottom: clamp(2rem, 5vw, 3rem);
  }

  .section-label {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--color-accent-sage);
    margin-bottom: var(--space-3);
  }

  .section-title {
    font-family: var(--font-heading);
    font-size: clamp(1.6rem, 3.5vw, 2.5rem);
    color: var(--color-text-primary);
    margin-bottom: var(--space-4);
  }

  .section-subtitle {
    font-size: 1.05rem;
    color: var(--color-text-secondary);
    max-width: 580px;
    margin-inline: auto;
  }

  /* --- Buttons --- */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: 0.75rem 1.5rem;
    min-height: 44px;
    min-width: 44px;
    border-radius: var(--radius-full);
    font-family: var(--font-body);
    font-size: 0.9375rem;
    font-weight: 600;
    line-height: 1;
    cursor: pointer;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast), color var(--transition-fast);
    text-decoration: none;
    border: 2px solid transparent;
    white-space: nowrap;
  }

  .btn:active {
    transform: scale(0.97);
  }

  .btn-primary {
    background-color: var(--color-accent-sage);
    color: #fff;
    border-color: var(--color-accent-sage);
  }

  .btn-primary:hover {
    background-color: hsl(163, 33%, 22%);
    border-color: hsl(163, 33%, 22%);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
  }

  .btn-secondary {
    background-color: transparent;
    color: var(--color-accent-sage);
    border-color: var(--color-accent-sage);
  }

  .btn-secondary:hover {
    background-color: var(--color-accent-sage-light);
    transform: translateY(-1px);
  }

  .btn-coral {
    background-color: var(--color-accent-coral);
    color: #fff;
    border-color: var(--color-accent-coral);
  }

  .btn-coral:hover {
    background-color: hsl(16, 64%, 48%);
    border-color: hsl(16, 64%, 48%);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
  }

  /* --- Divider --- */
  .divider {
    width: 48px;
    height: 3px;
    background-color: var(--color-accent-coral);
    border-radius: var(--radius-full);
    margin-block: var(--space-4);
  }

  .divider--center {
    margin-inline: auto;
  }
}

/* --- Utility Layer --- */
@layer utils {
  .sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
  }

  .visually-hidden {
    clip: rect(0 0 0 0);
    clip-path: inset(50%);
    height: 1px;
    overflow: hidden;
    position: absolute;
    white-space: nowrap;
    width: 1px;
  }

  .text-center { text-align: center; }
  .text-muted { color: var(--color-text-muted); }

  /* Reveal animation */
  .reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
  }

  .reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
  }

  @media (prefers-reduced-motion: reduce) {
    .reveal {
      opacity: 1;
      transform: none;
      transition: none;
    }
  }
}