/* ============================================================
   atmosfere Base Styles
   Source: atmosfere Brand Guidelines §18.2–18.3
   ============================================================ */

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

/* ── HTML & Body ── */
html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--text-base);
  font-weight: var(--font-regular);
  line-height: var(--leading-normal);
  color: var(--color-text-primary);
  background-color: var(--color-white);
}

/* ── Typography ── */
h1, .h1 {
  font-size: var(--text-5xl);
  font-weight: var(--font-semibold);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
}

h2, .h2 {
  font-size: var(--text-4xl);
  font-weight: var(--font-semibold);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
}

h3, .h3 {
  font-size: var(--text-3xl);
  font-weight: var(--font-medium);
  line-height: var(--leading-snug);
}

h4, .h4 { font-size: var(--text-2xl); font-weight: var(--font-medium); }
h5, .h5 { font-size: var(--text-xl);  font-weight: var(--font-medium); }
h6, .h6 { font-size: var(--text-lg);  font-weight: var(--font-medium); }

p { margin-bottom: var(--space-4); }
p:last-child { margin-bottom: 0; }

a {
  color: var(--color-brand-blue);
  text-decoration: none;
  transition: opacity var(--ease-fast);
}
a:hover { opacity: 0.8; }

ul, ol { list-style: none; }

img, svg { display: block; max-width: 100%; }

/* ── Text Utilities ── */
.text-display {
  font-size: clamp(var(--text-4xl), 5vw, var(--text-7xl));
  font-weight: var(--font-semibold);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
}

.text-lead    { font-size: var(--text-lg);  line-height: var(--leading-relaxed); color: var(--color-text-secondary); }
.text-muted   { color: var(--color-text-secondary); }
.text-caption { font-size: var(--text-sm);  color: var(--color-text-muted); }

.text-overline {
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--color-brand-blue);
}

.text-center { text-align: center; }
.text-left   { text-align: left; }

/* ── Layout ── */
.container {
  width: 100%;
  max-width: var(--container-xl);
  margin-inline: auto;
  padding-inline: var(--container-padding);
}

.container-sm  { width: 100%; max-width: var(--container-sm);  margin-inline: auto; padding-inline: var(--container-padding); }
.container-lg  { width: 100%; max-width: var(--container-lg);  margin-inline: auto; padding-inline: var(--container-padding); }
.container-2xl { width: 100%; max-width: var(--container-2xl); margin-inline: auto; padding-inline: var(--container-padding); }

.section    { padding-block: var(--space-24); }
.section-sm { padding-block: var(--space-16); }
.section-lg { padding-block: var(--space-32); }

/* ── Grid ── */
.grid   { display: grid; gap: var(--space-6); }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-6); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-6); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-6); }

/* ── Flex Utilities ── */
.flex         { display: flex; }
.flex-center  { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-col     { display: flex; flex-direction: column; }

.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* ── Accessibility ── */
.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;
}

:focus-visible {
  outline: 2px solid var(--color-brand-blue);
  outline-offset: 3px;
}

/* ── Responsive ── */
@media (max-width: 767px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .section    { padding-block: var(--space-16); }
  .section-lg { padding-block: var(--space-20); }
}

@media (min-width: 768px) and (max-width: 1023px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
  :root { --container-padding: var(--space-8); }
}