:root {
  --bg: #f6f7fb;
  --surface: #ffffff;
  --surface-soft: #eef2f8;
  --surface-muted: #f2f5fa;
  --text: #152033;
  --text-soft: #4c5b73;
  --text-muted: #70809a;
  --line: #d8e0ec;
  --line-strong: #c5d1e2;
  --accent: #2458d6;
  --accent-deep: #173f9c;
  --accent-soft: rgba(36, 88, 214, 0.10);
  --shadow: 0 24px 60px rgba(16, 35, 68, 0.08);
  --shadow-soft: 0 14px 36px rgba(16, 35, 68, 0.06);
  --radius-xl: 32px;
  --radius-lg: 24px;
  --radius-md: 18px;
  --container: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top left, rgba(36, 88, 214, 0.09), transparent 34%),
    linear-gradient(180deg, #fbfcfe 0%, var(--bg) 100%);
  color: var(--text);
  font-family:
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    "Helvetica Neue",
    Arial,
    "Hiragino Kaku Gothic ProN",
    "Yu Gothic",
    YuGothic,
    sans-serif;
  line-height: 1.7;
}

img {
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: min(calc(100% - 48px), var(--container));
  margin: 0 auto;
}

.section {
  padding: 108px 0;
}

.section-soft {
  background: rgba(255, 255, 255, 0.46);
  border-top: 1px solid rgba(216, 224, 236, 0.72);
  border-bottom: 1px solid rgba(216, 224, 236, 0.72);
}

.section-anchor {
  scroll-margin-top: 96px;
}

/* =========================================================
   HEADER
========================================================= */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid rgba(216, 224, 236, 0.78);
  background: rgba(251, 252, 254, 0.88);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.header-inner {
  width: min(calc(100% - 48px), var(--container));
  min-height: 76px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.brand-mark {
  width: 14px;
  height: 14px;
  display: inline-block;
  border-radius: 50%;
  background:
    radial-gradient(circle at 30% 30%, #7fa2ff, var(--accent) 60%, var(--accent-deep));
  box-shadow: 0 0 0 6px rgba(36, 88, 214, 0.12);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 24px;
  color: var(--text-soft);
  font-size: 14px;
  font-weight: 600;
}

.site-nav a {
  transition:
    color 0.2s ease,
    transform 0.2s ease;
}

.site-nav a:hover {
  color: var(--accent);
  transform: translateY(-1px);
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
  cursor: pointer;
  padding: 0;
}

.menu-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 5px auto;
  border-radius: 999px;
  background: var(--text);
}

/* =========================================================
   HERO
========================================================= */

.hero {
  padding: 82px 0 68px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.18fr) minmax(340px, 0.82fr);
  gap: 54px;
  align-items: center;
}

.hero-kicker,
.section-kicker {
  margin: 0 0 16px;
  color: var(--accent);
  font-size: 42px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  max-width: 800px;
  font-size: clamp(32px, 4.5vw, 56px);
  line-height: 1.08;
  letter-spacing: -0.055em;
  color: #000;
}

.hero h1 span {
  color: inherit;
}

.hero-description {
  max-width: 720px;
  margin: 28px 0 0;
  color: var(--text-soft);
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.75;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.hero-tags span {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.78);
  color: var(--text-soft);
  font-size: 14px;
  font-weight: 600;
  box-shadow: var(--shadow-soft);
}

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

.button {
  min-height: 52px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 22px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 800;
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease,
    background 0.2s ease,
    border-color 0.2s ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 18px 32px rgba(36, 88, 214, 0.22);
}

.button-primary:hover {
  background: var(--accent-deep);
}

.button-outline {
  border: 1px solid var(--line-strong);
  background: var(--surface);
  color: var(--text);
  box-shadow: var(--shadow-soft);
}

.button-ghost {
  color: var(--accent);
  background: var(--accent-soft);
}

.profile-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: rgba(255, 255, 255, 0.88);
  box-shadow: var(--shadow);
}

.profile-image-wrap {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background:
    radial-gradient(circle at 50% 30%, rgba(36, 88, 214, 0.18), transparent 56%),
    #eaf0fb;
}

.profile-image {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  object-position: center;
}

.profile-card-body {
  padding: 26px 28px 30px;
}

.profile-label {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.profile-card h2 {
  margin: 0;
  font-size: 28px;
  line-height: 1.25;
  letter-spacing: -0.03em;
}

.profile-affiliation {
  margin: 8px 0 22px;
  color: var(--text-soft);
  font-size: 15px;
}

.profile-meta {
  margin: 0;
  display: grid;
  gap: 14px;
}

.profile-meta div {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
}

.profile-meta dt {
  color: var(--text-muted);
  font-size: 13px;
  font-weight: 800;
}

.profile-meta dd {
  margin: 0;
  color: var(--text);
  font-size: 14px;
  font-weight: 600;
}

/* =========================================================
   QUICK FACTS
========================================================= */

.quick-facts {
  padding: 0 0 38px;
}

.facts-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.fact-card {
  min-height: 176px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.90);
  box-shadow: var(--shadow-soft);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}

.fact-label {
  margin: 0 0 auto;
  color: var(--accent);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.fact-number {
  display: block;
  margin-top: 28px;
  font-size: 52px;
  line-height: 1;
  letter-spacing: -0.06em;
}

.fact-card span {
  margin-top: 10px;
  color: var(--text-soft);
  font-size: 15px;
  font-weight: 700;
}

/* =========================================================
   SHARED SECTION LAYOUT
========================================================= */

.section-grid {
  display: grid;
  grid-template-columns: minmax(280px, 0.82fr) minmax(0, 1.18fr);
  gap: 54px;
  align-items: start;
}

.career-grid {
  grid-template-columns: minmax(280px, 0.3fr) minmax(0, 3.28fr);
}

.section-heading {
  max-width: 450px;
}

.section-heading h2,
.contact-card h2 {
  margin: 0;
  font-size: clamp(34px, 4vw, 54px);
  line-height: 1.18;
  letter-spacing: -0.045em;
}

.section-label {
  margin: 0 0 16px;
  color: #2f5fd0;
  font-size: clamp(18px, 2vw, 28px);
  font-weight: 800;
  letter-spacing: 0.12em;
}

.section-heading p:last-child,
.contact-card p {
  margin: 22px 0 0;
  color: var(--text-soft);
  font-size: 18px;
  line-height: 1.85;
}

/* =========================================================
   ABOUT
========================================================= */

.about-content {
  display: grid;
  gap: 18px;
}

.info-card {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.92);
  box-shadow: var(--shadow-soft);
}

.info-card h3 {
  margin: 0 0 10px;
  font-size: 22px;
  line-height: 1.3;
  letter-spacing: -0.025em;
}

.info-card p {
  margin: 0;
  color: var(--text-soft);
  font-size: 16px;
}

/* =========================================================
   RESEARCH
========================================================= */

.research-list {
  display: grid;
  gap: 18px;
}

.research-card {
  display: grid;
  grid-template-columns: 82px minmax(0, 1fr);
  gap: 22px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.94);
  box-shadow: var(--shadow-soft);
}

.research-number {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 3px;
  color: var(--accent);
  font-size: 34px;
  line-height: 1;
  font-weight: 900;
  letter-spacing: -0.05em;
}

.research-body h3 {
  margin: 0 0 10px;
  font-size: 25px;
  line-height: 1.3;
  letter-spacing: -0.03em;
}

.research-body p {
  margin: 0;
  color: var(--text-soft);
  font-size: 16px;
}

.research-body ul {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.research-body li {
  min-height: 36px;
  display: inline-flex;
  align-items: center;
  padding: 0 14px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-deep);
  font-size: 13px;
  font-weight: 800;
}

/* =========================================================
   ACHIEVEMENTS
========================================================= */

.achievements-heading {
  max-width: 760px;
  margin-bottom: 38px;
}

.achievement-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.achievement-card {
  min-height: 220px;
  padding: 28px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background:
    linear-gradient(
      145deg,
      rgba(36, 88, 214, 0.10),
      rgba(255, 255, 255, 0.98) 60%
    );
  box-shadow: var(--shadow-soft);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}

.achievement-card strong {
  font-size: clamp(56px, 5vw, 76px);
  line-height: 1;
  letter-spacing: -0.07em;
}

.achievement-card span {
  margin-top: 12px;
  color: var(--accent);
  font-size: 14px;
  font-weight: 900;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.achievement-card p {
  margin: 8px 0 0;
  color: var(--text-soft);
  font-size: 16px;
  font-weight: 700;
}

.selected-achievements {
  margin-top: 28px;
  padding: 34px;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: rgba(255, 255, 255, 0.94);
  box-shadow: var(--shadow-soft);
}

.subsection-title {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 18px;
}

.subsection-title h3 {
  margin: 0;
  font-size: 28px;
  line-height: 1.3;
  letter-spacing: -0.03em;
}

.subsection-title p {
  margin: 0;
  color: var(--text-soft);
  font-size: 15px;
}

.selected-list {
  display: grid;
  gap: 0;
}

.selected-item {
  padding: 24px 0;
  border-top: 1px solid var(--line);
}

.selected-item:first-child {
  border-top: none;
}

.item-meta {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.selected-item h4 {
  margin: 0 0 10px;
  font-size: 22px;
  line-height: 1.35;
  letter-spacing: -0.025em;
}


.selected-item p:last-child {
  margin: 0;
  max-width: 880px;
  color: var(--text-soft);
  font-size: 16px;
}

/* =========================================================
   WORKS
========================================================= */

.works-columns {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  margin-top: 40px;
}

.work-block {
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.94);
  box-shadow: var(--shadow-soft);
}

.work-block-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.work-block-head h3 {
  margin: 0;
  font-size: 28px;
  line-height: 1.3;
  letter-spacing: -0.03em;
}

.work-block-head span {
  color: var(--accent);
  font-size: 20px;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.bibliography {
  margin: 20px 0 0;
  padding-left: 22px;
}

.bibliography li {
  padding-left: 8px;
  color: var(--text-soft);
  font-size: 22px;
  line-height: 1.95;
}

.bibliography li + li {
  margin-top: 16px;
}

.bibliography strong {
  color: var(--text);
}

/* =========================================================
   CAREER
========================================================= */

.timeline-wrap {
  display: grid;
  gap: 22px;
}

.career-block {
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.94);
  box-shadow: var(--shadow-soft);
}

.career-block h3 {
  margin: 0 0 22px;
  font-size: 25px;
  line-height: 1.3;
  letter-spacing: -0.03em;
}

.timeline-entry {
  display: grid;
  grid-template-columns: 146px minmax(0, 1fr);
  gap: 20px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
}

.timeline-entry:first-of-type {
  border-top: none;
  padding-top: 0;
}

.timeline-entry time {
  color: var(--accent);
  font-size: 14px;
  font-weight: 900;
  letter-spacing: 0.03em;
}

.timeline-entry h4 {
  margin: 0 0 6px;
  font-size: 20px;
  line-height: 1.35;
  letter-spacing: -0.02em;
}

.timeline-entry p {
  margin: 0;
  color: var(--text-soft);
  font-size: 15px;
}

/* =========================================================
   CONTACT
========================================================= */

.contact-section {
  padding-top: 120px;
  padding-bottom: 128px;
  border-top: 1px solid rgba(36, 88, 214, 0.18);
  background: linear-gradient(180deg, rgba(246, 247, 251, 0.95) 0%, rgba(255, 255, 255, 0.98) 100%);
}

.contact-card {
  display: grid;
  grid-template-columns: 1fr minmax(300px, 0.82fr);
  gap: 36px;
  align-items: center;
  padding: 46px;
  border: 1px solid rgba(36, 88, 214, 0.16);
  border-radius: var(--radius-xl);
  background:
    radial-gradient(circle at right top, rgba(36, 88, 214, 0.14), transparent 42%),
    rgba(255, 255, 255, 0.98);
  box-shadow: 0 24px 60px rgba(36, 88, 214, 0.08);
}

.contact-links {
  display: grid;
  gap: 14px;
}

.contact-links a {
  min-height: 58px;
  display: flex;
  align-items: center;
  padding: 0 18px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--surface);
  color: var(--text);
  font-weight: 800;
  transition:
    transform 0.2s ease,
    border-color 0.2s ease,
    color 0.2s ease;
}

.contact-links a:hover {
  transform: translateY(-2px);
  border-color: rgba(36, 88, 214, 0.42);
  color: var(--accent);
}

/* =========================================================
   FOOTER
========================================================= */

.site-footer {
  padding: 28px 0 42px;
  border-top: 1px solid var(--line);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  color: var(--text-muted);
  font-size: 14px;
}

.footer-inner p {
  margin: 0;
}

.footer-inner a {
  color: var(--accent);
  font-weight: 800;
}

/* =========================================================
   REVEAL ANIMATION
========================================================= */

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition:
    opacity 0.75s ease,
    transform 0.75s ease;
}

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

/* =========================================================
   RESPONSIVE
========================================================= */

@media (max-width: 1080px) {
  .hero-grid,
  .section-grid,
  .contact-card {
    grid-template-columns: 1fr;
  }

  .profile-card {
    max-width: 620px;
  }

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

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

  .section-heading {
    max-width: 720px;
  }
}

@media (max-width: 760px) {
  .container,
  .header-inner {
    width: min(calc(100% - 28px), var(--container));
  }

  .section {
    padding: 78px 0;
  }

  .site-header {
    background: rgba(251, 252, 254, 0.96);
  }

  .header-inner {
    min-height: 70px;
    position: relative;
  }

  .menu-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    min-height: 46px;
    display: flex;
    align-items: center;
    padding: 0 14px;
    border-radius: 12px;
  }

  .site-nav a:hover {
    background: var(--surface-muted);
    transform: none;
  }

  .hero {
    padding-top: 58px;
  }

  .hero h1 {
    font-size: clamp(38px, 11vw, 56px);
  }

  .hero-description,
  .section-heading p:last-child,
  .contact-card p {
    font-size: 16px;
  }

  .hero-actions {
    display: grid;
    grid-template-columns: 1fr;
  }

  .button {
    width: 100%;
  }

  .profile-card-body,
  .info-card,
  .research-card,
  .work-block,
  .career-block,
  .selected-achievements,
  .contact-card {
    padding: 22px;
  }

  .facts-grid {
    grid-template-columns: 1fr;
  }

  .fact-card {
    min-height: 152px;
  }

  .research-card {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .research-number {
    justify-content: flex-start;
  }

  .achievement-card {
    min-height: 188px;
  }

  .timeline-entry {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}