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

:root {
  --paper: #FAFAF7;
  --ink: #1A1A1A;
  --ember: #D4580A;
  --dust: #7A6E5E;
  --sand: #C4B9A8;
  --chalk: #E8E4DD;
  --sans: 'Space Grotesk', system-ui, sans-serif;
  --mono: 'Space Mono', 'Courier New', monospace;
}

html {
  font-size: 18px;
  scroll-behavior: smooth;
}

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection {
  background: var(--ember);
  color: var(--paper);
}


/* ——— Navigation ——— */
nav {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 28px 40px 24px;
  max-width: 1200px;
  margin: 0 auto;
}

.nav-mark {
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ember);
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 24px;
}

.nav-links a {
  font-family: var(--mono);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--dust);
  text-decoration: none;
  transition: color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--ink);
}


/* ——— Hero ——— */
.hero {
  max-width: 1200px;
  margin: 0 auto;
  padding: 100px 40px 80px;
}

.hero-label {
  font-family: var(--mono);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ember);
  margin-bottom: 20px;
}

.hero h1 {
  font-family: var(--sans);
  font-size: clamp(3.2rem, 8vw, 6.5rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--ink);
  margin-bottom: 28px;
}

.hero h1 em {
  font-style: italic;
  color: var(--ember);
}

.hero-sub {
  font-size: 1.05rem;
  color: var(--dust);
  line-height: 1.6;
  max-width: 480px;
}


/* ——— Main Content ——— */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 40px 120px;
}

.principle {
  padding: 80px 0;
  border-top: 1px solid var(--chalk);
}

.principle-label {
  font-family: var(--mono);
  font-size: 0.65rem;
  font-weight: 400;
  letter-spacing: 0.1em;
  color: var(--sand);
  margin-bottom: 12px;
}

.principle h2 {
  font-family: var(--sans);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: 32px;
}

.principle-body {
  max-width: 640px;
}

.principle-body p {
  margin-bottom: 20px;
  color: var(--ink);
}

.principle-body p:last-child {
  margin-bottom: 0;
}

.principle-body strong {
  font-weight: 700;
}

.principle-body em {
  font-style: italic;
}


/* ——— Scale Demo ——— */
.example-block {
  margin: 36px 0;
  padding: 40px;
  background: white;
  border: 1px solid var(--chalk);
}

.example-label {
  font-family: var(--mono);
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--sand);
  margin-bottom: 24px;
}

.scale-demo {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.scale-small {
  font-family: var(--mono);
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ember);
}

.scale-large {
  font-family: var(--sans);
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--ink);
}

.scale-body {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--dust);
  max-width: 520px;
  margin-top: 4px;
}


/* ——— Color Study ——— */
.color-study {
  margin: 36px 0;
}

.swatch-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2px;
}

.swatch {
  padding: 32px 20px 20px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.swatch:first-child {
  border-radius: 6px 0 0 6px;
}

.swatch:last-child {
  border-radius: 0 6px 6px 0;
}

.swatch-name {
  font-family: var(--mono);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.swatch-hex {
  font-family: var(--mono);
  font-size: 0.6rem;
  opacity: 0.6;
}


/* ——— Blockquote ——— */
blockquote {
  margin: 36px 0;
  padding-left: 24px;
  border-left: 3px solid var(--ember);
}

blockquote p {
  font-size: 1.1rem;
  font-style: italic;
  line-height: 1.55;
  color: var(--ink);
}

blockquote cite {
  display: block;
  margin-top: 12px;
  font-family: var(--mono);
  font-size: 0.7rem;
  font-style: normal;
  color: var(--dust);
  letter-spacing: 0.04em;
}


/* ——— Comparison ——— */
.comparison {
  margin: 36px 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px;
}

.comparison-item {
  padding: 28px 24px;
  background: white;
  border: 1px solid var(--chalk);
}

.comparison-item:first-child {
  border-radius: 6px 0 0 6px;
}

.comparison-item:last-child {
  border-radius: 0 6px 6px 0;
}

.comparison-tag {
  font-family: var(--mono);
  font-size: 0.55rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: 20px;
}

.comparison-weak .comparison-tag {
  color: var(--sand);
}

.comparison-strong .comparison-tag {
  color: var(--ember);
}

.fake-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 16px;
  font-size: 0.72rem;
  color: var(--dust);
}

.comparison-weak .fake-nav {
  font-family: var(--sans);
  font-size: 0.65rem;
}

.comparison-strong .fake-nav {
  font-family: var(--sans);
  font-size: 0.75rem;
  gap: 20px;
  color: var(--ink);
}

.fake-nav-brand {
  font-weight: 700;
  letter-spacing: -0.02em;
}


/* ——— Color Comparison ——— */
.color-comparison {
  margin: 36px 0;
}

.palette-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.palette-title {
  font-family: var(--mono);
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--dust);
  margin-bottom: 12px;
}

.palette-swatches {
  display: flex;
  gap: 6px;
}

.mini-swatch {
  width: 40px;
  height: 40px;
  border-radius: 4px;
}


/* ——— Footer ——— */
footer {
  border-top: 1px solid var(--chalk);
  max-width: 1200px;
  margin: 0 auto;
  padding: 28px 40px;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.footer-mark {
  font-family: var(--mono);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink);
}

.footer-note {
  font-family: var(--mono);
  font-size: 0.6rem;
  color: var(--sand);
  letter-spacing: 0.02em;
}


/* ——— Mobile ——— */
@media (max-width: 640px) {
  html {
    font-size: 16px;
  }

  nav {
    padding: 20px 20px 16px;
  }

  .hero {
    padding: 60px 20px 48px;
  }

  .hero-sub br {
    display: none;
  }

  main {
    padding: 0 20px 80px;
  }

  .principle {
    padding: 48px 0;
  }

  .swatch-row {
    grid-template-columns: repeat(2, 1fr);
  }

  .comparison {
    grid-template-columns: 1fr;
  }

  .comparison-item:first-child {
    border-radius: 6px 6px 0 0;
  }

  .comparison-item:last-child {
    border-radius: 0 0 6px 6px;
  }

  .palette-row {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .example-block {
    padding: 24px;
    margin: 24px -20px;
    border-left: none;
    border-right: none;
    border-radius: 0;
  }

  footer {
    padding: 20px;
  }

  .footer-content {
    flex-direction: column;
    gap: 8px;
  }
}