:root {
  --shiro: #f5f2eb;
  --sumi: #1a1a1a;
  --ai: #264653;
  --shu: #c1440e;
  --kinari: #e8e0d0;
  --nezumi: #8c8578;
  --kin: #b8960c;
}

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

body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, sans-serif;
  background: var(--shiro);
  color: var(--sumi);
  line-height: 1.7;
  letter-spacing: 0.01em;
}

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

a:hover {
  color: var(--shu);
}

main,
header,
footer {
  padding-left: clamp(2rem, 8vw, 9rem);
  padding-right: clamp(2rem, 8vw, 9rem);
}

header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding-top: 2.5rem;
  padding-bottom: 4rem;
}

.brand {
  font-family: "Noto Serif JP", serif;
  font-weight: 500;
  color: var(--ai);
  font-size: 1.25rem;
  letter-spacing: 0.02em;
}

.contact-link {
  font-size: 0.95rem;
  color: var(--sumi);
}

.hero {
  position: relative;
  max-width: 720px;
  margin-left: 0;
  margin-bottom: 6rem;
}

.accent-line {
  width: 72px;
  height: 2px;
  background: var(--shu);
  margin-left: auto;
  margin-bottom: 2.5rem;
}

.accent-line.small {
  height: 1px;
  width: 56px;
  margin: 0;
}

h1,
h2,
h3 {
  font-family: "Noto Serif JP", serif;
  color: var(--ai);
  font-weight: 500;
  margin: 0 0 1.25rem 0;
}

h1 {
  font-size: clamp(2.8rem, 5vw, 3.5rem);
  line-height: 1.2;
}

h2 {
  font-size: clamp(2rem, 3vw, 2.6rem);
}

h3 {
  font-size: 1.5rem;
}

p {
  margin: 0 0 1.2rem 0;
  font-size: 1.05rem;
  color: var(--nezumi);
}

.hero p {
  font-size: 1.1rem;
  max-width: 520px;
}

.thesis {
  margin-bottom: 6rem;
}

.essay {
  max-width: 640px;
}

.portfolio {
  margin-bottom: 6rem;
}

.section-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 720px;
  margin-bottom: 2.5rem;
}

.card {
  background: var(--kinari);
  border: 1px solid var(--nezumi);
  padding: 2.5rem;
  max-width: 720px;
  margin-bottom: 2.5rem;
}

.card a {
  display: inline-block;
  margin-bottom: 1rem;
  color: var(--sumi);
  font-size: 0.95rem;
}

.tags {
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--nezumi);
}

.about {
  max-width: 540px;
  margin-bottom: 6rem;
}

footer {
  padding-bottom: 3rem;
}

footer hr {
  border: none;
  border-top: 1px solid var(--nezumi);
  margin: 0 0 2rem 0;
}

.footer-grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  align-items: start;
}

.subtle {
  color: var(--nezumi);
  font-size: 0.95rem;
}

@media (max-width: 600px) {
  header {
    flex-direction: column;
    gap: 1rem;
  }

  .accent-line {
    margin-left: 0;
  }
}

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