/* ---------- Design tokens ---------- */
:root {
  --bg: #0b0f0e;
  --bg-elev: #121715;
  --bg-elev-2: #171e1b;
  --border: #24302b;
  --text: #eaf2ee;
  --text-dim: #9fb0a9;
  --text-faint: #6c7d75;
  --accent: #34d399;
  --accent-dim: #1f8f6b;
  --accent-bg: rgba(52, 211, 153, 0.12);
  --tag-bg: #172420;
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
  --radius: 14px;
  --max-width: 880px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
    "Hiragino Kaku Gothic ProN", "Noto Sans JP", Roboto, Helvetica, Arial,
    sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Code", "Roboto Mono", Menlo,
    Consolas, monospace;
}

:root[data-theme="light"] {
  --bg: #f7faf8;
  --bg-elev: #ffffff;
  --bg-elev-2: #eef3f0;
  --border: #dde6e0;
  --text: #10201a;
  --text-dim: #4b5f57;
  --text-faint: #7c8b84;
  --accent: #0f9d68;
  --accent-dim: #0c7d54;
  --accent-bg: rgba(15, 157, 104, 0.1);
  --tag-bg: #eaf5ef;
  --shadow: 0 8px 30px rgba(20, 40, 30, 0.08);
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f7faf8;
    --bg-elev: #ffffff;
    --bg-elev-2: #eef3f0;
    --border: #dde6e0;
    --text: #10201a;
    --text-dim: #4b5f57;
    --text-faint: #7c8b84;
    --accent: #0f9d68;
    --accent-dim: #0c7d54;
    --accent-bg: rgba(15, 157, 104, 0.1);
    --tag-bg: #eaf5ef;
    --shadow: 0 8px 30px rgba(20, 40, 30, 0.08);
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  transition: background 0.2s ease, color 0.2s ease;
  overflow-x: hidden;
}

::selection { background: var(--accent); color: #04140d; }

/* ---------- Lang toggling ---------- */
html:not([data-lang="ja"]) .ja { display: none; }
html[data-lang="ja"] .en { display: none; }
html[data-lang="ja"] body { font-feature-settings: "palt"; }

a { color: inherit; }

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(180%) blur(14px);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  text-decoration: none;
  letter-spacing: -0.01em;
  color: var(--text);
  white-space: nowrap;
}
.brand-badge {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dim));
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  color: #04140d;
  flex: none;
}
.nav-links {
  display: flex;
  gap: 22px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 14.5px;
}
.nav-links a {
  text-decoration: none;
  color: var(--text-dim);
  transition: color 0.15s ease;
}
.nav-links a:hover { color: var(--accent); }

.nav-controls { display: flex; align-items: center; gap: 8px; }

.icon-btn {
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text-dim);
  border-radius: 8px;
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease;
}
.icon-btn:hover { border-color: var(--accent); color: var(--accent); }
.icon-btn svg { width: 16px; height: 16px; }

.lang-toggle {
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text-dim);
  border-radius: 8px;
  height: 34px;
  padding: 0 10px;
  font-size: 12.5px;
  font-weight: 600;
  font-family: var(--mono);
  cursor: pointer;
  letter-spacing: 0.02em;
}
.lang-toggle:hover { border-color: var(--accent); color: var(--accent); }

.theme-icon-dark { display: inline; }
.theme-icon-light { display: none; }
:root[data-theme="light"] .theme-icon-dark { display: none; }
:root[data-theme="light"] .theme-icon-light { display: inline; }
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) .theme-icon-dark { display: none; }
  :root:not([data-theme="dark"]) .theme-icon-light { display: inline; }
}

/* ---------- Hero ---------- */
.hero { padding: 72px 0 40px; }
.eyebrow {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--accent);
  letter-spacing: 0.04em;
  margin: 0 0 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.eyebrow::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-bg);
}
h1.name {
  font-size: clamp(34px, 5vw, 50px);
  line-height: 1.1;
  margin: 0 0 10px;
  letter-spacing: -0.02em;
  font-weight: 800;
}
.role {
  font-size: clamp(17px, 2.3vw, 20px);
  color: var(--text-dim);
  margin: 0 0 22px;
  font-weight: 500;
}
.pitch {
  font-size: 16.5px;
  color: var(--text-dim);
  max-width: 62ch;
  margin: 0 0 30px;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 30px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 18px;
  border-radius: 9px;
  font-size: 14.5px;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.12s ease, opacity 0.15s ease, border-color 0.15s ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent); color: #04140d; }
.btn-primary:hover { opacity: 0.88; }
.btn-ghost { background: transparent; border-color: var(--border); color: var(--text); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

.contact-row {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  font-size: 14px;
  color: var(--text-dim);
}
.contact-row a { text-decoration: none; color: var(--text-dim); }
.contact-row a:hover { color: var(--accent); }
.contact-row span { display: inline-flex; align-items: center; gap: 6px; }
.contact-row svg { width: 15px; height: 15px; flex: none; opacity: 0.8; }

/* ---------- Sections ---------- */
section { padding: 56px 0; border-top: 1px solid var(--border); }
.hero { border-top: none; }
.section-head { margin-bottom: 30px; }
.section-label {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin: 0 0 8px;
}
h2 {
  font-size: clamp(22px, 3vw, 27px);
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}
.section-sub { color: var(--text-dim); font-size: 15px; max-width: 60ch; margin: 0; }

.about-body { color: var(--text-dim); font-size: 15.5px; max-width: 68ch; }

/* ---------- Experience ---------- */
.job {
  padding: 22px 0;
  border-bottom: 1px solid var(--border);
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 24px;
}
.job:last-child { border-bottom: none; }
.job-meta { color: var(--text-faint); font-size: 13.5px; font-family: var(--mono); line-height: 1.5; }
.job-meta .company { color: var(--text-dim); font-weight: 600; font-family: var(--font); font-size: 14.5px; display: block; margin-top: 2px; }
.job-title { font-size: 16.5px; font-weight: 700; margin: 0 0 12px; }
.job ul { margin: 0; padding-left: 18px; color: var(--text-dim); font-size: 14.5px; }
.job li { margin-bottom: 8px; }
.job li:last-child { margin-bottom: 0; }
.job li strong { color: var(--text); font-weight: 600; }

.other-exp {
  margin-top: 20px;
  display: grid;
  gap: 10px;
}
.other-exp-item {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: 14px;
  color: var(--text-dim);
  flex-wrap: wrap;
}
.other-exp-item strong { color: var(--text); font-weight: 600; }
.other-exp-item .period { font-family: var(--mono); color: var(--text-faint); font-size: 13px; white-space: nowrap; }

/* ---------- Projects ---------- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}
.card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  display: flex;
  flex-direction: column;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.card:hover { border-color: var(--accent-dim); transform: translateY(-2px); }
.card-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 10px; margin-bottom: 10px; }
.card-title { font-size: 16.5px; font-weight: 700; margin: 0; }
.card a.card-link {
  color: var(--text-faint);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 7px;
  border: 1px solid var(--border);
  flex: none;
}
.card a.card-link:hover { color: var(--accent); border-color: var(--accent); }
.card a.card-link svg { width: 14px; height: 14px; }
.card-tagline { font-size: 14.5px; color: var(--text-dim); margin: 0 0 12px; }
.card-why { font-size: 13.5px; color: var(--text-faint); margin: 0 0 16px; padding-left: 12px; border-left: 2px solid var(--accent-dim); }
.tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: auto; }
.tag {
  font-family: var(--mono);
  font-size: 11.5px;
  background: var(--tag-bg);
  color: var(--text-dim);
  padding: 4px 8px;
  border-radius: 6px;
  border: 1px solid var(--border);
}

/* ---------- Skills ---------- */
.skills-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px 32px; }
.skill-cat h3 {
  font-size: 13.5px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  margin: 0 0 10px;
  font-weight: 600;
}
.skill-cat p { margin: 0; color: var(--text-dim); font-size: 14.5px; }

/* ---------- OSS ---------- */
.oss-list { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.oss-list .tag { font-size: 13px; padding: 6px 11px; }

/* ---------- Education / Languages ---------- */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.edu-item { margin-bottom: 14px; }
.edu-item .degree { font-weight: 600; font-size: 14.5px; }
.edu-item .school { color: var(--text-dim); font-size: 13.5px; }
.lang-item { display: flex; justify-content: space-between; font-size: 14.5px; padding: 7px 0; border-bottom: 1px solid var(--border); }
.lang-item:last-child { border-bottom: none; }
.lang-item .level { color: var(--text-faint); font-family: var(--mono); font-size: 13px; }

/* ---------- Contact / Footer ---------- */
.contact-section { text-align: left; }
.contact-cards { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 22px; }
.contact-card {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 18px;
  text-decoration: none;
  color: var(--text);
  flex: 1 1 220px;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.contact-card:hover { border-color: var(--accent); transform: translateY(-1px); }
.contact-card .icon {
  width: 36px; height: 36px; border-radius: 9px;
  background: var(--accent-bg); color: var(--accent);
  display: flex; align-items: center; justify-content: center; flex: none;
}
.contact-card .icon svg { width: 17px; height: 17px; }
.contact-card .label { font-size: 12px; color: var(--text-faint); }
.contact-card .value { font-size: 14.5px; font-weight: 600; }

footer {
  border-top: 1px solid var(--border);
  padding: 28px 0 40px;
  color: var(--text-faint);
  font-size: 13px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}
footer a { color: var(--text-faint); text-decoration: underline; text-underline-offset: 2px; }
footer a:hover { color: var(--accent); }

/* ---------- Responsive ---------- */
@media (max-width: 720px) {
  .nav-links { display: none; }
  .job { grid-template-columns: 1fr; gap: 8px; }
  .projects-grid { grid-template-columns: 1fr; }
  .skills-grid { grid-template-columns: 1fr; }
  .two-col { grid-template-columns: 1fr; gap: 24px; }
  .hero { padding: 48px 0 28px; }
  section { padding: 40px 0; }
}