:root {
  color-scheme: light;
  --bg: #f7f9fc;
  --surface: #ffffff;
  --surface-soft: #eef4fb;
  --text: #102033;
  --muted: #5d6d80;
  --line: #dce5ef;
  --brand: #0046d5;
  --brand-deep: #061a75;
  --brand-mid: #0a57e8;
  --accent: #ff9500;
  --accent-text: #002f9f;
  --button-text: #ffffff;
  --shadow: rgba(18, 42, 80, 0.12);
  --content: clamp(1040px, 68vw, 1320px);
  --gutter: clamp(18px, 3.2vw, 56px);
  --text-measure: 34rem;
  --pad: clamp(18px, 3vw, 48px);
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #07101e;
  --hero-left: #0c1930;
  --hero-right: #102954;
  --surface: #0e1a2b;
  --surface-soft: #101f35;
  --text: #f4f8ff;
  --muted: #aab8ca;
  --line: rgba(255, 255, 255, 0.13);
  --brand: #1b63ff;
  --brand-deep: #06105c;
  --brand-mid: #0b42c8;
  --accent: #ff9b17;
  --accent-text: #8fb0ff;
  --button-text: #07101e;
  --shadow: rgba(0, 0, 0, 0.28);
}

:root {
  --hero-left: #eaf2ff;
  --hero-right: #c9dcf7;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: "DM Sans", "Noto Sans JP", sans-serif;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
p { margin-top: 0; }

.shell {
  width: 100%;
}

.site-header {
  width: 100%;
  height: 86px;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  position: relative;
  z-index: 3;
}

.header-inner {
  width: min(calc(100% - var(--gutter) * 2), var(--content));
  height: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  font-size: clamp(20px, 1.3vw, 23px);
  color: var(--brand-deep);
}

:root[data-theme="dark"] .brand { color: var(--text); }

.brand-mark {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: linear-gradient(145deg, #ffffff, #eef5ff);
  box-shadow: inset 0 0 0 1px rgba(0, 70, 213, 0.12), 0 8px 20px rgba(20, 45, 90, 0.12);
  overflow: hidden;
}

:root[data-theme="dark"] .brand-mark {
  background: linear-gradient(145deg, rgba(28, 70, 138, 0.34), rgba(255, 255, 255, 0.06));
  box-shadow: inset 0 0 0 1px rgba(111, 166, 255, 0.26), 0 8px 22px rgba(0,0,0,.22);
  padding: 3px;
}

.brand-mark img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.brand-mark-dark {
  transform: scale(1.03);
  border-radius: 11px;
}

.brand-mark-dark { display: none!important; }

:root[data-theme="dark"] .brand-mark-light { display: none!important; }
:root[data-theme="dark"] .brand-mark-dark { display: block!important; }

nav {
  display: flex;
  align-items: center;
  gap: clamp(18px, 1.6vw, 28px);
  margin-left: auto;
}

nav a {
  color: var(--text);
  font-size: clamp(13px, .82vw, 14px);
  font-weight: 700;
}

nav a:hover { color: var(--brand); }

.theme-toggle {
  height: 40px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface-soft);
  color: var(--text);
  font: inherit;
  font-size: 13px;
  font-weight: 800;
  cursor: pointer;
}

.theme-toggle-icon {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid currentColor;
  background: linear-gradient(90deg, currentColor 0 50%, transparent 50% 100%);
}

.header-cta {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 22px;
  border-radius: 999px;
  background: var(--brand);
  color: #fff;
  font-size: 14px;
  font-weight: 800;
}

.hero {
  width: 100%;
  min-height: clamp(520px, 62vh, 680px);
  margin: 0;
  background:
    radial-gradient(ellipse at 78% 24%, color-mix(in srgb, var(--brand) 18%, transparent), transparent 42%),
    radial-gradient(ellipse at 22% 28%, color-mix(in srgb, var(--brand) 7%, transparent), transparent 38%),
    linear-gradient(90deg, var(--hero-left) 0%, color-mix(in srgb, var(--hero-left) 72%, var(--hero-right)) 48%, var(--hero-right) 100%);
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid color-mix(in srgb, var(--line) 82%, transparent);
}

.hero::before {
  content: "";
  position: absolute;
  top: 9%;
  right: 6%;
  width: min(46vw, 760px);
  height: 68%;
  background: color-mix(in srgb, var(--surface) 84%, var(--hero-left));
  border-radius: 999px 0 0 999px;
  opacity: .54;
  pointer-events: none;
  z-index: 0;
}

:root[data-theme="dark"] .hero::before {
  background: color-mix(in srgb, var(--hero-right) 68%, #2456a5);
  opacity: .38;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 0%, transparent 72%, color-mix(in srgb, var(--bg) 72%, transparent) 100%);
  pointer-events: none;
  z-index: 0;
}

:root[data-theme="dark"] .hero::after {
  background: linear-gradient(180deg, transparent 0%, transparent 72%, rgba(7, 16, 30, .45) 100%);
}

.hero-layout {
  width: min(calc(100% - var(--gutter) * 2), var(--content));
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(360px, 0.9fr) minmax(420px, 1.1fr);
  gap: clamp(34px, 4.2vw, 64px);
  align-items: center;
  padding: clamp(42px, 5vh, 64px) 0 clamp(62px, 7vh, 88px);
  color: var(--text);
  position: relative;
  z-index: 1;
}

.hero-inner {
  position: relative;
  z-index: 1;
}

.hero-visual {
  min-height: clamp(330px, 31vw, 420px);
  position: relative;
  overflow: hidden;
  border-radius: 44px 10px 44px 10px;
  background: var(--surface-soft);
  box-shadow: 0 26px 70px var(--shadow);
}

.hero-visual::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, color-mix(in srgb, var(--surface) 88%, transparent), transparent 42%);
  z-index: 1;
  pointer-events: none;
}

.hero-visual img {
  width: 100%;
  height: 100%;
  min-height: clamp(330px, 31vw, 420px);
  object-fit: cover;
  display: block;
}

.eyebrow {
  margin: 0 0 22px;
  color: var(--accent-text);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 1.8px;
  text-transform: uppercase;
}

h1, h2, h3 {
  margin: 0;
  letter-spacing: 0;
  font-family: "Noto Sans JP", sans-serif;
}

h1 {
  max-width: 11em;
  font-size: clamp(40px, 4.1vw, 68px);
  line-height: 1.1;
  font-weight: 800;
}

.lead {
  max-width: var(--text-measure);
  margin: 24px 0 0;
  color: var(--muted);
  font-size: clamp(15px, .98vw, 17px);
  line-height: 1.82;
  font-weight: 500;
}

.hero-actions,
.card-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.button {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 0 28px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 800;
  transition: transform 0.2s, box-shadow 0.2s;
}

.button:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 30px rgba(0, 0, 0, 0.16);
}

.button-primary {
  background: var(--accent);
  color: #101010;
}

.button-secondary {
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.hero-meta span {
  padding: 8px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: var(--surface);
  font-size: clamp(11px, .75vw, 12px);
  font-weight: 800;
}

.shortcut-section {
  width: min(calc(100% - var(--gutter) * 2), var(--content));
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  border: 0;
  padding: 48px 0;
  background: transparent;
  position: relative;
  isolation: isolate;
}

.shortcut-section::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0;
  width: 100vw;
  height: 100%;
  transform: translateX(-50%);
  background: linear-gradient(180deg, #d4e3f7 0%, #eef4fb 100%);
  z-index: -1;
}

:root[data-theme="dark"] .shortcut-section::before {
  background: linear-gradient(180deg, #15345f 0%, #0b1c31 100%);
}

.shortcut-card {
  min-height: 156px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 28px;
  border-radius: 7px;
  color: #fff;
  background:
    radial-gradient(circle at 86% 16%, rgba(0, 190, 255, 0.38), transparent 34%),
    linear-gradient(135deg, #004ecb, #06196f);
  box-shadow: 0 24px 55px var(--shadow);
  position: relative;
}

:root[data-theme="dark"] .shortcut-card {
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.38), inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.shortcut-card span {
  font-size: 13px;
  font-weight: 800;
  opacity: 0.82;
  text-transform: uppercase;
  letter-spacing: 1.3px;
}

.shortcut-card b {
  margin-top: 16px;
  font-size: clamp(21px, 1.45vw, 26px);
  line-height: 1.25;
}

.shortcut-card em {
  width: fit-content;
  margin-top: 24px;
  padding: 11px 20px;
  border-radius: 999px;
  background: var(--accent);
  color: #111;
  font-style: normal;
  font-size: 13px;
  font-weight: 800;
}

section {
  width: min(calc(100% - var(--gutter) * 2), var(--content));
  margin: 0 auto;
  padding: 86px 0;
}

.shortcut-section + section {
  padding-top: 96px;
}

.section-head {
  display: grid;
  grid-template-columns: minmax(260px, 0.78fr) minmax(0, 1fr);
  gap: 60px;
  align-items: end;
  margin-bottom: 32px;
}

.kicker,
.label {
  color: var(--accent-text);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 1.5px;
  text-transform: uppercase;
}

.kicker { margin: 0 0 12px; }

h2 {
  font-size: clamp(30px, 3vw, 48px);
  line-height: 1.18;
  color: var(--text);
}

.section-head p {
  color: var(--muted);
  max-width: 42rem;
  font-size: clamp(14px, .95vw, 16px);
  line-height: 1.8;
  margin: 0;
}

.link-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.link-grid .card:nth-child(1),
.link-grid .card:nth-child(2) {
  grid-column: span 1;
}

.card,
.feature-item,
.project-card,
.profile-card,
.detail-card {
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: 0 12px 30px var(--shadow);
}

.card {
  min-height: 210px;
  display: flex;
  flex-direction: column;
  padding: 24px;
  border-radius: 7px;
}

.card h3 {
  margin-top: 18px;
  color: var(--text);
  font-size: clamp(18px, 1.18vw, 21px);
  line-height: 1.35;
}

.card p {
  color: var(--muted);
  font-size: clamp(13px, .86vw, 14px);
  line-height: 1.75;
  margin: 12px 0 0;
}

.card a {
  margin-top: auto;
  padding-top: 22px;
  color: var(--accent-text);
  font-size: 13px;
  font-weight: 800;
}

.feature-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.feature-item,
.project-card {
  min-height: 180px;
  padding: 24px;
  border-radius: 7px;
}

.feature-item h3,
.project-card h3 {
  color: var(--text);
  font-size: 21px;
  line-height: 1.35;
  margin-bottom: 10px;
}

.project-card h3 {
  margin-top: 28px;
}

.feature-item p,
.project-card p {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.75;
  margin: 0;
}

.project-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.developer-layout {
  display: grid;
  grid-template-columns: minmax(310px, 0.82fr) minmax(0, 1.18fr);
  gap: 14px;
}

.profile-card,
.detail-card {
  padding: 30px;
  border-radius: 7px;
}

.profile-card {
  background:
    radial-gradient(circle at 100% 0, color-mix(in srgb, var(--brand) 18%, transparent), transparent 36%),
    var(--surface);
}

.avatar {
  width: 86px;
  height: 86px;
  display: grid;
  place-items: center;
  border: 1px solid color-mix(in srgb, var(--brand) 20%, var(--line));
  border-radius: 24px;
  background: linear-gradient(145deg, color-mix(in srgb, var(--brand) 9%, var(--surface)), var(--surface));
  box-shadow: 0 16px 38px var(--shadow);
  margin-bottom: 22px;
  overflow: hidden;
  padding: 4px;
}

:root[data-theme="dark"] .avatar {
  border-color: rgba(111, 166, 255, 0.24);
  background: linear-gradient(145deg, rgba(28, 70, 138, 0.28), rgba(255, 255, 255, 0.06));
  box-shadow: 0 18px 42px rgba(0, 0, 0, 0.34);
}

.avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 19px;
  display: block;
}

.profile-card h3 {
  color: var(--text);
  font-size: 34px;
}

.role,
.detail-card > p,
.profile-card p:not(.role) {
  color: var(--muted);
  font-size: 15px;
  line-height: 1.75;
}

.role {
  color: var(--text);
  font-weight: 700;
  margin: 9px 0 18px;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 22px;
}

.tags span {
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.detail-card h3 {
  color: var(--text);
  font-size: 25px;
  margin-bottom: 12px;
}

.skill-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 22px;
}

.skill-grid div {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--surface-soft);
}

.skill-grid b,
.skill-grid span {
  display: block;
}

.skill-grid b {
  color: var(--text);
  font-size: 13px;
  margin-bottom: 7px;
}

.skill-grid span {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.65;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

footer {
  width: min(calc(100% - var(--gutter) * 2), var(--content));
  margin: 0 auto;
  padding: 36px 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.footer-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 18px;
  line-height: 1.4;
}

.footer-links a {
  min-height: 20px;
  display: inline-flex;
  align-items: center;
}

.footer-links a:hover { color: var(--brand); }

.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1050px) {
  nav { display: none; }
  .hero { background: var(--bg); }
  .hero-layout { grid-template-columns: 1fr; padding-top: 44px; }
  .hero-visual { min-height: 320px; order: -1; }
  .hero-visual img { min-height: 320px; }
  .link-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .feature-list, .project-strip, .developer-layout { grid-template-columns: 1fr; }
  .section-head { grid-template-columns: 1fr; gap: 20px; }
}

@media (max-width: 680px) {
  :root { --gutter: 18px; }
  .site-header { height: 68px; }
  .header-inner { gap: 10px; }
  .brand { font-size: 18px; gap: 8px; }
  .brand-mark { width: 34px; height: 34px; border-radius: 8px; }
  .theme-toggle { height: 36px; padding: 0 10px; margin-left: auto; }
  .theme-toggle-text, .header-cta { display: none; }
  .hero {
    min-height: 0;
    background:
      linear-gradient(180deg, var(--hero-left) 0%, color-mix(in srgb, var(--hero-left) 78%, var(--hero-right)) 100%);
  }
  .hero::before,
  .hero::after {
    display: none;
  }
  .hero-layout { padding: 28px 0 46px; gap: 24px; }
  .hero-visual { min-height: 210px; order: 0; border-radius: 22px 7px 22px 7px; }
  .hero-visual::before { background: linear-gradient(180deg, color-mix(in srgb, var(--surface) 84%, transparent), transparent 48%); }
  .hero-visual img { min-height: 210px; }
  .eyebrow { font-size: 10px; margin-bottom: 14px; }
  h1 { max-width: 100%; font-size: clamp(34px, 10vw, 46px); line-height: 1.14; }
  .lead { max-width: 100%; margin-top: 18px; font-size: 14px; line-height: 1.75; }
  .hero-actions, .card-actions { flex-direction: column; gap: 10px; margin-top: 24px; }
  .button { width: 100%; min-height: 44px; padding: 0 18px; }
  .hero-meta { margin-top: 18px; gap: 7px; }
  .hero-meta span { font-size: 11px; padding: 7px 9px; }
  .shortcut-section { grid-template-columns: 1fr; margin-top: 0; padding: 28px 0; gap: 12px; }
  .shortcut-section::before { display: block; }
  .shortcut-card { min-height: 132px; padding: 22px; }
  .shortcut-card b { font-size: 21px; }
  .shortcut-card em { margin-top: 18px; padding: 10px 16px; }
  section { padding: 56px 0; }
  .shortcut-section + section { padding-top: 60px; }
  .section-head { margin-bottom: 24px; }
  h2 { font-size: clamp(28px, 8vw, 38px); }
  .section-head p { font-size: 14px; line-height: 1.75; }
  .link-grid, .skill-grid, .contact-grid { grid-template-columns: 1fr; }
  .card, .feature-item, .project-card, .profile-card, .detail-card { padding: 20px; }
  .card { min-height: auto; }
  .footer-inner { flex-direction: column; }
}