/* =========================================================
   Akito Kuranari — Portfolio
   シンプル・クリーンなレスポンシブスタイル
   ========================================================= */

:root {
  --ink: #1f2937;
  --ink-strong: #111827;
  --muted: #6b7280;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --border: #e5e7eb;
  --radius: 12px;
  --container: 960px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Inter", "Noto Sans JP", system-ui, -apple-system, "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 24px;
}

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav__logo {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--ink-strong);
  letter-spacing: 0.02em;
}
.nav__logo:hover { text-decoration: none; }

.nav__menu {
  display: flex;
  gap: 28px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav__menu a {
  color: var(--ink);
  font-size: 0.92rem;
  font-weight: 500;
}

/* ---------- Hero ---------- */
.hero {
  padding: 96px 0 80px;
  background: linear-gradient(180deg, var(--bg-alt), var(--bg));
  border-bottom: 1px solid var(--border);
}

.hero__eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero__title {
  margin: 0;
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--ink-strong);
  line-height: 1.2;
}

.hero__tagline {
  margin: 16px 0 0;
  font-size: clamp(1rem, 2.4vw, 1.25rem);
  font-weight: 600;
  color: var(--ink);
}

.hero__lead {
  margin: 24px 0 0;
  color: var(--muted);
  max-width: 620px;
}
.hero__lead strong { color: var(--ink); }

.hero__actions {
  margin-top: 36px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 28px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.15s ease, background 0.15s ease, box-shadow 0.15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-2px); }

.btn--primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 6px 18px rgba(37, 99, 235, 0.28);
}
.btn--primary:hover { background: var(--accent-dark); }

.btn--ghost {
  background: #fff;
  color: var(--ink);
  border: 1px solid var(--border);
}
.btn--ghost:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- Sections ---------- */
.section { padding: 80px 0; }
.section--alt { background: var(--bg-alt); }

.section__title {
  margin: 0 0 8px;
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--ink-strong);
  position: relative;
  padding-bottom: 14px;
}
.section__title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 44px;
  height: 3px;
  border-radius: 3px;
  background: var(--accent);
}

.section__intro {
  margin: 0 0 36px;
  color: var(--muted);
}

/* ---------- About ---------- */
.about { max-width: 700px; }
.about p { margin: 0 0 18px; }
.about strong { color: var(--ink-strong); }

/* ---------- Skills ---------- */
.skills {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.skill-group {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
}
.skill-group__title {
  margin: 0 0 16px;
  font-size: 1.05rem;
  color: var(--ink-strong);
}
.tags {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.tags li {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  color: var(--ink);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 6px 14px;
  border-radius: 999px;
}

/* ---------- Strength ---------- */
.strength {
  display: flex;
  align-items: stretch;
  gap: 16px;
  flex-wrap: wrap;
}
.strength__step {
  flex: 1;
  min-width: 200px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  position: relative;
}
.strength__num {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.1em;
  margin-bottom: 10px;
}
.strength__step h3 {
  margin: 0 0 8px;
  font-size: 1.1rem;
  color: var(--ink-strong);
}
.strength__step p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--muted);
}
.strength__arrow {
  display: flex;
  align-items: center;
  color: var(--accent);
  font-size: 1.5rem;
  font-weight: 700;
}
.strength__note {
  margin: 28px 0 0;
  font-size: 0.88rem;
  color: var(--muted);
}

/* ---------- Works ---------- */
.works {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}
.work-card {
  display: block;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  color: inherit;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}
.work-card:hover {
  text-decoration: none;
  transform: translateY(-4px);
  box-shadow: 0 16px 36px rgba(17, 24, 39, 0.10);
}
.work-card__thumb {
  height: 180px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 1.4rem;
  letter-spacing: 0.08em;
}
.work-card__thumb--cafe { background: linear-gradient(135deg, #b45309, #f59e0b); }
.work-card__thumb--clinic { background: linear-gradient(135deg, #0e7490, #22d3ee); }
.work-card__thumb--construction { background: linear-gradient(135deg, #0f2c4c, #1d6fb8); }
.work-card__thumb--kinyoku { background: linear-gradient(135deg, #3f4690, #8a90d8); }
.work-card__body { padding: 24px; }
.work-card__title {
  margin: 0 0 8px;
  font-size: 1.1rem;
  color: var(--ink-strong);
}
.work-card__desc {
  margin: 0 0 16px;
  font-size: 0.92rem;
  color: var(--muted);
}
.work-card__tags {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
}
.work-card__tags li {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  font-size: 0.78rem;
  padding: 4px 12px;
  border-radius: 999px;
  color: var(--muted);
}

/* ---------- Contact ---------- */
.contact {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}
.contact__item {
  flex: 1;
  min-width: 240px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 28px;
  color: inherit;
  transition: border-color 0.15s ease;
}
.contact__item:hover { text-decoration: none; border-color: var(--accent); }
.contact__label {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}
.contact__value {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--ink-strong);
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px 0;
  background: var(--bg-alt);
}
.site-footer p {
  margin: 0;
  text-align: center;
  font-size: 0.85rem;
  color: var(--muted);
}

/* ---------- Responsive ---------- */
@media (max-width: 760px) {
  .nav__menu { display: none; }
  .hero { padding: 72px 0 60px; }
  .section { padding: 60px 0; }
  .skills { grid-template-columns: 1fr; }
  .works { grid-template-columns: 1fr; }
  .strength__arrow { display: none; }
}