:root {
  --color-limestone: #F4EFE4;
  --color-ivory: #FBF7EE;
  --color-navy: #14243A;
  --color-navy-soft: #3A4A5E;
  --color-aegean: #2E6F8E;
  --color-aegean-deep: #22566F;
  --color-olive: #6B7A3A;
  --color-bronze: #A8792F;
  --color-terracotta: #A64B3C;
  --color-indigo: #3B3F7A;
  --color-indigo-deep: #1E2145;
  --color-line: #D8CFBE;
  --color-focus: #B98A2E;

  --font-heading: "Cormorant Garamond", Georgia, serif;
  --font-body: Inter, system-ui, -apple-system, "Segoe UI", sans-serif;

  --text-display: clamp(2.6rem, 5vw, 4.4rem);
  --text-h1: clamp(2.1rem, 3.6vw, 3.2rem);
  --text-h2: clamp(1.6rem, 2.4vw, 2.2rem);
  --text-h3: 1.25rem;
  --text-body-large: 1.125rem;
  --text-body: 1rem;
  --text-small: 0.875rem;
  --text-label: 0.75rem;

  --leading-display: 1.05;
  --leading-h1: 1.1;
  --leading-h2: 1.2;
  --leading-h3: 1.3;
  --leading-body: 1.65;
  --leading-small: 1.5;
  --leading-label: 1.2;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --space-9: 96px;
  --space-10: 128px;

  --container-max: 1120px;
  --container-pad-mobile: 24px;
  --container-pad-tablet: 32px;
  --container-pad-desktop: 48px;
  --reading-max: 720px;

  --radius-sm: 2px;
  --radius-lg: 4px;

  --shadow-soft: 0 2px 8px rgba(20, 36, 58, 0.08);

  --border-hairline: 1px solid var(--color-line);
  --border-bronze-rule: 3px solid var(--color-bronze);
  --border-olive-rule: 3px solid var(--color-olive);
  --border-terracotta-rule: 3px solid var(--color-terracotta);

  --transition-fast: 150ms ease;
  --transition-expand: 200ms ease;
}

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

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

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

img,
picture,
video,
canvas,
svg {
  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-aegean);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-aegean-deep);
  text-decoration: underline;
  text-decoration-color: var(--color-bronze);
  text-underline-offset: 3px;
}

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

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  color: var(--color-navy);
  margin-block-end: var(--space-4);
}

h1 {
  font-size: var(--text-h1);
  line-height: var(--leading-h1);
  margin-block-end: var(--space-5);
}

h2 {
  font-size: var(--text-h2);
  line-height: var(--leading-h2);
  margin-block-end: var(--space-4);
}

h3 {
  font-size: var(--text-h3);
  line-height: var(--leading-h3);
  margin-block-end: var(--space-3);
}

h4,
h5,
h6 {
  font-size: var(--text-h3);
  line-height: var(--leading-h3);
  margin-block-end: var(--space-3);
}

p {
  margin-block-end: var(--space-4);
}

ul,
ol {
  margin-block-end: var(--space-4);
  padding-inline-start: var(--space-5);
}

blockquote {
  margin-block-end: var(--space-4);
  padding-inline-start: var(--space-4);
  border-inline-start: var(--border-olive-rule);
  color: var(--color-navy-soft);
}

figure {
  margin-block-end: var(--space-5);
}

figcaption {
  font-size: var(--text-small);
  line-height: var(--leading-small);
  color: var(--color-navy-soft);
  margin-block-start: var(--space-2);
}

hr {
  border: none;
  border-top: var(--border-hairline);
  margin-block: var(--space-6);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-block-end: var(--space-5);
}

th,
td {
  padding: var(--space-3) var(--space-4);
  border: var(--border-hairline);
  text-align: start;
}

th {
  font-family: var(--font-heading);
  font-weight: 600;
  color: var(--color-navy);
  background-color: var(--color-ivory);
}

.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad-mobile);
}

.reading-column {
  max-width: var(--reading-max);
  margin-inline: auto;
}

.label {
  font-size: var(--text-label);
  line-height: var(--leading-label);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-bronze);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-sm);
  font-size: var(--text-label);
  line-height: var(--leading-label);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
  min-height: 44px;
}

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

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

.btn-primary {
  background-color: var(--color-aegean);
  color: #FFFFFF;
  border: 1px solid var(--color-aegean);
}

.btn-primary:hover {
  background-color: var(--color-aegean-deep);
  border-color: var(--color-aegean-deep);
  color: #FFFFFF;
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-navy);
  border: 1px solid var(--color-navy);
}

.btn-secondary:hover {
  background-color: var(--color-navy);
  color: var(--color-ivory);
}

.btn-panel {
  background-color: transparent;
  color: var(--color-ivory);
  border: 1px solid var(--color-ivory);
}

.btn-panel:hover {
  background-color: var(--color-ivory);
  color: var(--color-navy);
}

.surface-card {
  background-color: var(--color-ivory);
  border: var(--border-hairline);
  border-radius: var(--radius-sm);
  padding: var(--space-4);
}

.surface-panel {
  background-color: var(--color-ivory);
  border: var(--border-hairline);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
}

.surface-dark {
  background-color: var(--color-navy);
  color: var(--color-ivory);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
}

.surface-dark h1,
.surface-dark h2,
.surface-dark h3,
.surface-dark h4,
.surface-dark h5,
.surface-dark h6 {
  color: var(--color-ivory);
}

.surface-challenge {
  background-color: var(--color-indigo-deep);
  color: var(--color-ivory);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
}

.surface-challenge h1,
.surface-challenge h2,
.surface-challenge h3,
.surface-challenge h4,
.surface-challenge h5,
.surface-challenge h6 {
  color: var(--color-ivory);
}

.stone-header {
  background-color: var(--color-ivory);
  border-top: var(--border-bronze-rule);
  border-bottom: var(--border-hairline);
  padding-block: var(--space-5);
  padding-inline: var(--space-4);
}

.tactical-callout {
  background-color: var(--color-limestone);
  border-inline-start: var(--border-olive-rule);
  padding: var(--space-4);
  margin-block-end: var(--space-4);
}

.tactical-callout .label {
  color: var(--color-olive);
}

.risk-callout {
  background-color: var(--color-limestone);
  border-inline-start: var(--border-terracotta-rule);
  padding: var(--space-4);
  margin-block-end: var(--space-4);
}

.risk-callout .label {
  color: var(--color-terracotta);
}

.screenshot-plate {
  background-color: var(--color-ivory);
  border: var(--border-hairline);
  border-radius: var(--radius-sm);
  padding: var(--space-2);
  margin-block-end: var(--space-4);
}

.screenshot-plate img {
  border-radius: var(--radius-sm);
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 16 / 9;
}

.screenshot-plate figcaption {
  padding: var(--space-2);
  margin-block-start: 0;
}

.hex-pattern {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='56' height='64' viewBox='0 0 56 64'%3E%3Cpath d='M28 0L56 16V48L28 64L0 48V16Z' fill='none' stroke='%23A8792F' stroke-width='1' opacity='0.08'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 56px 64px;
}

.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;
}

.content-list {
  list-style: none;
  padding-inline-start: 0;
  margin-block-end: var(--space-4);
}

.content-list li {
  margin-block-end: var(--space-2);
}

.content-list li:last-child {
  margin-block-end: 0;
}

.content-list > li:last-child {
  margin-block-end: 0;
}

.card > :last-child,
.panel > :last-child,
.surface-card > :last-child,
.surface-panel > :last-child,
.surface-dark > :last-child,
.surface-challenge > :last-child,
.stone-header > :last-child,
.tactical-callout > :last-child,
.risk-callout > :last-child,
.screenshot-plate > :last-child {
  margin-block-end: 0;
}

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

  .surface-card {
    padding: var(--space-5);
  }

  .surface-panel {
    padding: var(--space-6);
  }

  .surface-dark {
    padding: var(--space-6);
  }

  .surface-challenge {
    padding: var(--space-6);
  }

  .stone-header {
    padding-block: var(--space-6);
    padding-inline: var(--space-5);
  }
}

@media (min-width: 1024px) {
  .container {
    padding-inline: var(--container-pad-desktop);
  }

  .surface-card {
    padding: var(--space-5);
  }

  .surface-panel {
    padding: var(--space-6);
  }

  .surface-dark {
    padding: var(--space-6);
  }

  .surface-challenge {
    padding: var(--space-6);
  }

  .stone-header {
    padding-block: var(--space-6);
    padding-inline: var(--space-6);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}