/* =========================
   RESET
========================= */

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

* {
  margin: 0;
}

html {
  scroll-behavior: smooth;
  text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  padding-top: var(--header-height);
  overflow-x: clip;
  font-family: var(--font-primary);
  font-size: var(--text-base);
  line-height: var(--line-body);
  color: var(--color-text);
  background:
    radial-gradient(circle at top left, rgba(216, 149, 32, 0.08), transparent 34rem),
    linear-gradient(180deg, var(--color-background), #f7efe3 42%, var(--color-background));
  text-rendering: optimizeLegibility;
}

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

img {
  height: auto;
}

input,
button,
textarea,
select {
  font: inherit;
}

button {
  border: 0;
  color: inherit;
  background: transparent;
  cursor: pointer;
}

a {
  color: inherit;
  text-decoration: none;
}

ul,
ol {
  padding: 0;
  list-style: none;
}

table {
  border-collapse: collapse;
  width: 100%;
}

/* =========================
   ACCESSIBILITY
========================= */

:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 4px;
}

::selection {
  color: var(--color-surface);
  background: var(--color-brand);
}

[hidden] {
  display: none !important;
}

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

.skip-link {
  position: absolute;
  top: var(--space-4);
  left: var(--space-4);
  z-index: var(--z-modal);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  color: var(--color-surface);
  background: var(--color-brand-dark);
  transform: translateY(-150%);
  transition: transform var(--transition-fast);
}

.skip-link:focus {
  transform: translateY(0);
}

/* =========================
   ACADEMIC NOTICE
========================= */

.academic-notice {
  position: fixed;
  right: clamp(1rem, 3vw, 2rem);
  bottom: clamp(1rem, 3vw, 2rem);
  z-index: var(--z-modal);
  width: min(42rem, calc(100vw - 2rem));
  padding: var(--space-4);
  border: 1px solid rgba(111, 31, 23, 0.24);
  border-radius: var(--radius-lg);
  color: var(--color-text);
  background: rgba(255, 247, 233, 0.98);
  box-shadow: var(--shadow-lg);
}

.academic-notice__content {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-4);
  align-items: center;
}

.academic-notice__eyebrow {
  margin-bottom: var(--space-1);
  color: var(--color-brand-dark);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.academic-notice h2 {
  margin-bottom: var(--space-2);
  font-family: var(--font-primary);
  font-size: var(--text-md);
  line-height: var(--line-heading);
}

.academic-notice p {
  color: var(--color-muted);
  font-size: var(--text-sm);
  line-height: 1.55;
}

.academic-notice__button {
  min-height: 44px;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-pill);
  color: var(--color-surface);
  font-size: var(--text-sm);
  font-weight: 700;
  background: var(--color-brand);
  box-shadow: var(--shadow-sm);
  transition:
    background var(--transition-fast),
    transform var(--transition-fast);
}

.academic-notice__button:hover {
  background: var(--color-brand-dark);
  transform: translateY(-1px);
}

@media (max-width: 42rem) {
  .academic-notice {
    right: 1rem;
    bottom: 1rem;
  }

  .academic-notice__content {
    grid-template-columns: 1fr;
  }

  .academic-notice__button {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}

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

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  color: var(--color-ink);
  line-height: var(--line-heading);
  font-weight: 700;
  letter-spacing: 0;
}

h1 {
  font-size: var(--text-hero);
  line-height: var(--line-tight);
}

h2 {
  font-size: var(--text-2xl);
}

h3 {
  font-size: var(--text-xl);
}

h4 {
  font-size: var(--text-lg);
}

h5,
h6 {
  font-size: var(--text-md);
}

p {
  max-width: 72ch;
  margin-bottom: var(--space-4);
}

strong {
  font-weight: 700;
}

small {
  font-size: var(--text-sm);
}

/* =========================
   LAYOUT
========================= */

.container {
  width: min(100% - calc(var(--container-padding) * 2), var(--container));
  margin-inline: auto;
}

.container-narrow {
  width: min(100% - calc(var(--container-padding) * 2), var(--container-narrow));
  margin-inline: auto;
}

section,
.section {
  padding-block: var(--section-y);
}

.section-header {
  max-width: var(--container-narrow);
  margin-inline: auto;
  margin-bottom: var(--space-7);
  text-align: center;
}

.section-eyebrow {
  display: inline-block;
  margin-bottom: var(--space-3);
  color: var(--color-accent-dark);
  font-family: var(--font-primary);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.section-title {
  margin-bottom: var(--space-3);
}

.section-description {
  margin-inline: auto;
  color: var(--color-muted);
  font-size: var(--text-md);
}

/* =========================
   UTILITIES
========================= */

.flow > * + * {
  margin-top: var(--space-4);
}

.stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.cluster {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-4);
}

.grid-auto {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr));
  gap: var(--space-6);
}

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

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

.surface {
  background: var(--color-surface);
}

.surface-warm {
  background: var(--color-surface-warm);
}