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

:root {
  --color-primary: #2563eb;
  --color-primary-light: #3b82f6;
  --color-text: #1f2937;
  --color-text-light: #6b7280;
  --color-bg: #ffffff;
  --color-bg-alt: #f9fafb;
  --color-border: #e5e7eb;
  --color-card-shadow: rgba(0, 0, 0, 0.08);
  --max-width: 960px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* ── Header ── */
.header {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.header-logo {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
}

.header-nav {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.header-nav a {
  font-size: 0.875rem;
  color: var(--color-text-light);
  text-decoration: none;
  transition: color 0.2s;
}

.header-nav a:hover {
  color: var(--color-primary);
}

/* ── Sections ── */
.section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 4rem 1.5rem;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.section-subtitle {
  color: var(--color-text-light);
  margin-bottom: 2.5rem;
}

/* ── Hero ── */
.hero {
  padding: 5rem 1.5rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.hero-label {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-primary);
  background: #eff6ff;
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  margin-bottom: 1.25rem;
}

.hero h1 {
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 1rem;
}

.hero-catch {
  font-size: 1.125rem;
  color: var(--color-text-light);
  margin-bottom: 1.5rem;
}

.hero-bio {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  max-width: 600px;
  line-height: 1.8;
}

/* ── Services ── */
.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.service-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 1.5rem;
}

.service-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
  background: #eff6ff;
  color: var(--color-primary);
}

.service-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.375rem;
}

.service-card p {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ── Works ── */
.works-bg {
  background: var(--color-bg-alt);
}

.works-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.work-card {
  background: var(--color-bg);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 1px 3px var(--color-card-shadow), 0 4px 12px var(--color-card-shadow);
  transition: box-shadow 0.2s;
}

.work-card:hover {
  box-shadow: 0 2px 6px var(--color-card-shadow), 0 8px 24px rgba(0, 0, 0, 0.12);
}

a.work-card--link {
  display: block;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
}

.work-thumb {
  width: 100%;
  aspect-ratio: 16 / 10;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8125rem;
  font-weight: 600;
  color: #fff;
  position: relative;
}

.work-thumb--web {
  background: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
}

.work-thumb--mobile {
  background: linear-gradient(135deg, #059669 0%, #0891b2 100%);
}

.work-thumb--desktop {
  background: linear-gradient(135deg, #1e293b 0%, #475569 100%);
}

.work-thumb--ai {
  background: linear-gradient(135deg, #d97706 0%, #dc2626 100%);
}

.work-thumb--saas {
  background: linear-gradient(135deg, #2563eb 0%, #06b6d4 100%);
}

.work-thumb--cafe {
  background: linear-gradient(135deg, #92400e 0%, #d4a574 100%);
}

.work-thumb--nursery {
  background: linear-gradient(135deg, #86efac 0%, #fde68a 100%);
}

.work-thumb--ec {
  background: linear-gradient(135deg, #1c1917 0%, #ea580c 100%);
}

.work-thumb--architect {
  background: linear-gradient(135deg, #166534 0%, #4ade80 100%);
}

.work-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top;
}

.work-thumb-label {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  opacity: 0.3;
  position: absolute;
}

.work-thumb-type {
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
  font-size: 0.6875rem;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.2);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
}

.work-body {
  padding: 1.25rem;
}

.work-body h3 {
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: 0.375rem;
}

.work-body p {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 0.75rem;
}

.work-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
  margin-bottom: 0.75rem;
}

.work-tag {
  font-size: 0.6875rem;
  font-weight: 500;
  color: var(--color-primary);
  background: #eff6ff;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
}

.work-link {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-primary);
  text-decoration: none;
}

.work-link:hover {
  text-decoration: underline;
}

.work-status {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-light);
  background: var(--color-bg-alt);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
}

.works-category-title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--color-text-light);
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  padding-left: 0.75rem;
  border-left: 3px solid var(--color-primary);
}

.works-category-title:first-of-type {
  margin-top: 0;
}

.works-category-desc {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  margin-bottom: 1rem;
  margin-top: -0.5rem;
}

.work-card--mock {
  border: 2px dashed var(--color-border);
  box-shadow: none;
  opacity: 0.7;
}

.work-card--mock:hover {
  box-shadow: none;
}

.work-card--mock .work-thumb {
  opacity: 0.5;
}

.work-card--mock .work-body h3 {
  color: var(--color-text-light);
}

.work-card--mock .work-body p {
  font-style: italic;
}

/* ── Skills ── */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1.25rem;
}

.skill-group h3 {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-text-light);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
}

.skill-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.skill-list li {
  font-size: 0.875rem;
  padding-left: 0.75rem;
  position: relative;
}

.skill-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--color-primary);
}

/* ── Contact ── */
.contact-bg {
  background: var(--color-bg-alt);
}

.contact-box {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 2rem;
  text-align: center;
  max-width: 520px;
  margin: 0 auto;
}

.contact-box p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  margin-bottom: 1.25rem;
}

.contact-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-bg);
  background: var(--color-primary);
  padding: 0.625rem 1.5rem;
  border-radius: 8px;
  text-decoration: none;
  transition: background 0.2s;
}

.contact-link:hover {
  background: var(--color-primary-light);
}

.contact-link svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

/* ── Footer ── */
.footer {
  text-align: center;
  padding: 2rem 1.5rem;
  font-size: 0.75rem;
  color: var(--color-text-light);
  border-top: 1px solid var(--color-border);
}

/* ── Responsive ── */
@media (max-width: 640px) {
  .hero h1 {
    font-size: 1.625rem;
  }

  .hero-catch {
    font-size: 1rem;
  }

  .services-grid,
  .works-grid {
    grid-template-columns: 1fr;
  }

  .header-nav {
    gap: 1rem;
  }

  .header-nav a {
    font-size: 0.8125rem;
  }

  .section {
    padding: 3rem 1.25rem;
  }

  .hero {
    padding: 3rem 1.25rem;
  }

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