:root {
  --color-paper: #F7F3EA;
  --color-navy: #12233F;
  --color-olive: #5F6F3A;
  --color-signal: #E86A2C;
  --color-dusty: #7C9BB5;
  --color-graphite: #3A3F45;
  --color-sand: #E6DCC8;
  --color-paper-strong: #FFFDF8;
  --color-success: #3F7A4A;
  --color-danger: #B23A2E;

  --font-heading: "Barlow Condensed", sans-serif;
  --font-body: "Source Sans 3", sans-serif;

  --text-display-size: clamp(2.5rem, 6vw, 3.5rem);
  --text-h1-size: clamp(2rem, 4.5vw, 2.5rem);
  --text-h2-size: clamp(1.5rem, 3vw, 1.75rem);
  --text-h3-size: 1.25rem;
  --text-body-size: 1rem;
  --text-small-size: 0.875rem;
  --text-micro-size: 0.75rem;

  --text-display-leading: 1.05;
  --text-h1-leading: 1.1;
  --text-h2-leading: 1.2;
  --text-h3-leading: 1.3;
  --text-body-leading: 1.6;
  --text-small-leading: 1.5;
  --text-micro-leading: 1.4;

  --text-display-weight: 700;
  --text-h1-weight: 700;
  --text-h2-weight: 600;
  --text-h3-weight: 600;
  --text-body-weight: 400;
  --text-small-weight: 400;
  --text-micro-weight: 600;

  --space-2xs: 0.25rem;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  --container-max: 1200px;
  --container-reading: 72ch;

  --surface-paper: var(--color-paper);
  --surface-sand: var(--color-sand);
  --surface-paper-strong: var(--color-paper-strong);
  --surface-olive: var(--color-olive);
  --surface-dusty: var(--color-dusty);

  --border-hairline: 1px solid rgba(58, 63, 69, 0.2);
  --border-diagram: 2px solid var(--color-graphite);
  --border-navy: 2px solid var(--color-navy);
  --border-navy-hairline: 1px solid rgba(18, 35, 63, 0.15);

  --shadow-card: 0 2px 8px rgba(18, 35, 63, 0.08);

  --radius-0: 0;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  --transition-fast: 150ms ease-out;
  --transition-panel: 250ms ease-out;

  --focus-ring: 3px solid var(--color-signal);
  --focus-offset: 2px;
}

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

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

body {
  min-height: 100vh;
  background-color: var(--surface-paper);
  color: var(--color-navy);
  font-family: var(--font-body);
  font-size: var(--text-body-size);
  font-weight: var(--text-body-weight);
  line-height: var(--text-body-leading);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

button {
  background: none;
  border: none;
  cursor: pointer;
}

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

a:hover {
  text-decoration: underline;
  text-decoration-color: var(--color-graphite);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
[tabindex]:focus-visible {
  outline: var(--focus-ring);
  outline-offset: var(--focus-offset);
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  color: var(--color-navy);
  line-height: var(--text-h1-leading);
  font-weight: var(--text-h1-weight);
}

.display {
  font-family: var(--font-heading);
  font-size: var(--text-display-size);
  line-height: var(--text-display-leading);
  font-weight: var(--text-display-weight);
  color: var(--color-navy);
}

h1 {
  font-size: var(--text-h1-size);
  line-height: var(--text-h1-leading);
  font-weight: var(--text-h1-weight);
  margin-block-end: var(--space-md);
}

h2 {
  font-size: var(--text-h2-size);
  line-height: var(--text-h2-leading);
  font-weight: var(--text-h2-weight);
  margin-block-end: var(--space-sm);
}

h3 {
  font-size: var(--text-h3-size);
  line-height: var(--text-h3-leading);
  font-weight: var(--text-h3-weight);
  margin-block-end: var(--space-xs);
}

p {
  margin-block-end: var(--space-md);
  line-height: var(--text-body-leading);
}

p:last-child {
  margin-block-end: 0;
}

ul,
ol {
  margin-block-end: var(--space-md);
  padding-inline-start: var(--space-lg);
}

ul:last-child,
ol:last-child {
  margin-block-end: 0;
}

li {
  line-height: var(--text-body-leading);
}

blockquote {
  margin-block-end: var(--space-md);
  padding: var(--space-lg);
  background-color: var(--surface-sand);
  border-inline-start: 4px solid var(--color-olive);
  color: var(--color-navy);
  border-radius: var(--radius-md);
}

blockquote:last-child {
  margin-block-end: 0;
}

blockquote p {
  margin-block-end: var(--space-sm);
}

blockquote p:last-child {
  margin-block-end: 0;
}

figure {
  margin-block-end: var(--space-lg);
}

figure:last-child {
  margin-block-end: 0;
}

figcaption {
  font-size: var(--text-small-size);
  line-height: var(--text-small-leading);
  font-weight: var(--text-small-weight);
  color: var(--color-navy);
  text-align: left;
  margin-block-start: var(--space-xs);
}

small {
  font-size: var(--text-small-size);
  line-height: var(--text-small-leading);
}

.micro {
  font-size: var(--text-micro-size);
  line-height: var(--text-micro-leading);
  font-weight: var(--text-micro-weight);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-md);
}

.container--reading {
  max-width: var(--container-reading);
}

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

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

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

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

.card {
  background-color: var(--surface-sand);
  border: var(--border-hairline);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
}

.card--elevated {
  background-color: var(--surface-paper-strong);
  box-shadow: var(--shadow-card);
}

.card--info {
  background-color: var(--surface-dusty);
  color: var(--color-navy);
  border: var(--border-navy-hairline);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
}

.card > :last-child {
  margin-block-end: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding-inline: var(--space-lg);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: var(--text-small-size);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  transition:
    background-color var(--transition-fast),
    transform var(--transition-fast),
    border-color var(--transition-fast);
  border: var(--border-navy);
  cursor: pointer;
}

.btn:hover {
  text-decoration: none;
}

.btn--primary {
  background-color: var(--color-signal);
  color: var(--color-navy);
  border: var(--border-navy);
}

.btn--primary:hover {
  background-color: #d15f27;
  transform: translateY(1px);
}

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

.btn--secondary:hover {
  background-color: rgba(18, 35, 63, 0.06);
  transform: translateY(1px);
}

.badge {
  display: inline-block;
  padding: var(--space-2xs) var(--space-sm);
  border-radius: var(--radius-sm);
  font-size: var(--text-micro-size);
  line-height: var(--text-micro-leading);
  font-weight: var(--text-micro-weight);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.badge--olive {
  background-color: var(--color-olive);
  color: var(--color-paper);
}

.badge--dusty {
  background-color: var(--color-dusty);
  color: var(--color-navy);
}

.step-dot {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: var(--color-signal);
  color: var(--color-navy);
  font-family: var(--font-heading);
  font-size: var(--text-small-size);
  font-weight: 700;
  line-height: 1;
}

.route-line {
  display: block;
  height: 2px;
  background-color: var(--color-graphite);
  border-radius: 2px;
}

.figure-frame {
  border: var(--border-diagram);
  border-radius: var(--radius-0);
  background-color: var(--surface-paper);
  overflow: hidden;
}

.figure-frame img {
  width: 100%;
  height: auto;
  display: block;
}

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

@media (min-width: 768px) {
  .container {
    padding-inline: var(--space-xl);
  }
}

@media (min-width: 1024px) {
  .container {
    padding-inline: var(--space-2xl);
  }
}