:root {
  --color-bg: #fafaf7;
  --color-surface: #ffffff;
  --color-text: #1f2933;
  --color-muted: #6b7280;
  --color-accent: #2f5d50;
  --color-accent-light: #e6efe9;
  --color-border: #e5e7eb;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.06);
  --radius: 12px;
  --max-width: 960px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Hiragino Sans",
    "Yu Gothic UI", "Segoe UI", sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: opacity 0.2s ease;
}

a:hover {
  opacity: 0.7;
}

img {
  max-width: 100%;
  display: block;
}

/* ===== Header / Navigation ===== */
.site-header {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: saturate(180%) blur(10px);
}

.site-header__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.site-logo {
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 0.04em;
  color: var(--color-text);
}

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 1.5rem;
}

.site-nav a {
  color: var(--color-muted);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.site-nav a:hover,
.site-nav a.is-active {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
  opacity: 1;
}

/* ===== Main / Layout ===== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

.section {
  margin-bottom: 4rem;
}

.section-title {
  font-size: 1.5rem;
  margin: 0 0 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border);
}

.section-title span {
  display: inline-block;
  border-bottom: 2px solid var(--color-accent);
  padding-bottom: 0.4rem;
  margin-bottom: -1px;
}

/* ===== Hero (top page) ===== */
.hero {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 2.5rem;
  align-items: center;
  padding: 2rem 0 3rem;
}

.hero__avatar img {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  object-fit: cover;
  box-shadow: var(--shadow-md);
}

.hero__name {
  font-size: 2rem;
  margin: 0 0 0.25rem;
  letter-spacing: 0.02em;
}

.hero__role {
  color: var(--color-muted);
  margin: 0 0 1rem;
  font-size: 1rem;
}

.hero__lead {
  margin: 0;
  font-size: 1rem;
  color: var(--color-text);
}

/* ===== Profile / Lists ===== */
.profile-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 140px 1fr;
  row-gap: 0.75rem;
  column-gap: 1rem;
}

.profile-list dt {
  color: var(--color-muted);
  font-weight: 500;
  font-size: 0.9rem;
}

.profile-list dd {
  margin: 0;
}

/* ===== Works (cards) ===== */
.work-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.5rem;
}

.work-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  display: flex;
  flex-direction: column;
}

.work-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.work-card__thumb {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  background-color: var(--color-accent-light);
}

.work-card__body {
  padding: 1.25rem;
  flex: 1;
}

.work-card__title {
  font-size: 1.05rem;
  margin: 0 0 0.5rem;
}

.work-card__desc {
  color: var(--color-muted);
  font-size: 0.9rem;
  margin: 0 0 0.75rem;
}

.tag-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tag {
  background-color: var(--color-accent-light);
  color: var(--color-accent);
  font-size: 0.75rem;
  padding: 0.15rem 0.6rem;
  border-radius: 999px;
}

/* ===== Hobbies ===== */
.hobby-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.hobby-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-align: center;
}

.hobby-card img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: var(--radius);
  margin-bottom: 1rem;
}

.hobby-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
}

.hobby-card p {
  color: var(--color-muted);
  font-size: 0.9rem;
  margin: 0;
}

/* ===== Contact ===== */
.contact-lead {
  font-size: 1rem;
  color: var(--color-muted);
  margin-bottom: 2rem;
}

.contact-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  max-width: 560px;
}

.contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.contact-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--color-border);
  gap: 1rem;
}

.contact-list li:last-child {
  border-bottom: none;
}

.contact-list__label {
  color: var(--color-muted);
  font-size: 0.9rem;
  flex-shrink: 0;
}

.contact-list__value {
  text-align: right;
  word-break: break-all;
}

.contact-form {
  display: grid;
  gap: 1rem;
  margin-top: 2rem;
}

.contact-form label {
  display: grid;
  gap: 0.35rem;
  font-size: 0.9rem;
  color: var(--color-muted);
}

.contact-form input,
.contact-form textarea {
  font: inherit;
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background-color: var(--color-surface);
  color: var(--color-text);
  transition: border-color 0.2s ease;
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}

.contact-form button {
  justify-self: start;
  background-color: var(--color-accent);
  color: #fff;
  border: none;
  padding: 0.7rem 1.6rem;
  border-radius: 999px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s ease;
}

.contact-form button:hover {
  opacity: 0.85;
}

/* ===== Footer ===== */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 2rem 1.5rem;
  text-align: center;
  color: var(--color-muted);
  font-size: 0.85rem;
}

/* ===== Responsive ===== */
@media (max-width: 640px) {
  .hero {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 1.5rem;
  }

  .hero__avatar img {
    margin: 0 auto;
    width: 160px;
    height: 160px;
  }

  .profile-list {
    grid-template-columns: 1fr;
    row-gap: 0.25rem;
  }

  .profile-list dt {
    margin-top: 0.5rem;
  }

  .site-header__inner {
    padding: 0.85rem 1rem;
  }

  .site-nav ul {
    gap: 1rem;
  }

  .contact-list li {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }

  .contact-list__value {
    text-align: left;
  }
}