:root {
  --bg: #ffffff;
  --surface: #f7f9fb;
  --surface-strong: #ffffff;
  --ink: #202428;
  --muted: #56616d;
  --line: rgba(32, 36, 40, 0.14);
  --accent: #245f8f;
  --accent-soft: rgba(36, 95, 143, 0.08);
  --shadow: none;
  --radius: 10px;
  --max: 1020px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Manrope", "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--bg);
  min-height: 100vh;
}

body::before {
  content: none;
}

.page-shell {
  width: min(calc(100% - 40px), var(--max));
  margin: 0 auto;
  padding-bottom: 30px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0 9px;
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(8px);
  background: rgba(255, 255, 255, 0.92);
}

.brand,
.site-nav a,
.button,
.language-switch button {
  text-decoration: none;
  color: inherit;
}

.brand {
  font-family: "Noto Serif SC", serif;
  font-size: 1.05rem;
  letter-spacing: 0.04em;
}

.site-nav {
  display: flex;
  gap: 13px;
  font-size: 0.9rem;
  color: var(--muted);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.site-nav a {
  position: relative;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -5px;
  width: 100%;
  height: 1px;
  background: var(--ink);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 220ms ease;
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after {
  transform: scaleX(1);
}

.language-switch {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
  font-size: 0.86rem;
  white-space: nowrap;
}

.language-switch button {
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
  font: inherit;
}

.language-switch button:hover,
.language-switch button:focus-visible,
.language-switch button.is-active {
  color: var(--accent);
}

.language-switch button.is-active {
  cursor: default;
  font-weight: 700;
}

.language-switch button:disabled {
  opacity: 1;
}

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(300px, 0.8fr);
  gap: 20px;
  align-items: start;
  min-height: auto;
  padding: 22px 0 16px;
}

.hero-copy {
  position: relative;
  z-index: 1;
  max-width: 780px;
}

.hero h1,
.section-intro h2,
.notes-head h2,
.contact h2 {
  margin: 0;
  font-family: "Noto Serif SC", serif;
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.02em;
}

.hero h1 {
  font-size: clamp(2.15rem, 4.4vw, 3.1rem);
  max-width: none;
}

.hero-text {
  max-width: 48rem;
  margin: 10px 0 0;
  font-size: 0.98rem;
  line-height: 1.65;
  color: var(--muted);
}

.hero-role {
  margin: 16px 0 0;
  font-size: 1.08rem;
  line-height: 1.8;
  color: var(--accent);
}

.hero-meta {
  margin-top: 10px;
  color: var(--muted);
  line-height: 1.5;
}

.hero-actions {
  display: flex;
  gap: 8px;
  margin-top: 12px;
  flex-wrap: wrap;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 34px;
  padding: 0 12px;
  border-radius: 6px;
  border: 1px solid transparent;
  transition:
    background-color 220ms ease,
    border-color 220ms ease;
}

.button:hover,
.button:focus-visible {
  border-color: var(--accent);
}

.button-primary {
  background: var(--accent);
  color: #fbfbf9;
}

.button-secondary {
  border-color: var(--line);
  background: var(--surface-strong);
}

.hero-panel {
  position: relative;
  padding: 16px 14px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-strong);
  box-shadow: var(--shadow);
}

.hero-side {
  display: grid;
  gap: 8px;
  padding-top: 34px;
}

.signal-list {
  margin: 0;
  padding-left: 18px;
  list-style: disc;
  display: grid;
  gap: 4px;
}

.signal-list li {
  padding-bottom: 0;
  border-bottom: 0;
  font-size: 0.94rem;
  line-height: 1.5;
}

.panel-note {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
}

.panel-note span {
  display: inline-block;
  margin-bottom: 5px;
  color: var(--accent);
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.panel-note p {
  margin: 0;
  color: var(--muted);
  line-height: 1.5;
}

.panel-lead {
  margin: 0 0 8px;
  color: var(--muted);
  line-height: 1.5;
}

.hero-glow {
  display: none;
}

.section-grid,
.notes,
.contact {
  margin-top: 28px;
  padding: 16px 0 0;
  border-top: 1px solid var(--line);
}

.section-grid {
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr);
  gap: 24px;
}

.section-intro h2,
.notes-head h2,
.contact h2 {
  font-size: clamp(1.25rem, 2.4vw, 1.65rem);
  max-width: none;
}

.contact-layout h2 {
  font-size: clamp(1.25rem, 2.3vw, 1.7rem);
  line-height: 1.12;
  max-width: 16ch;
}

.section-body {
  display: grid;
  gap: 8px;
  max-width: none;
}

.fact-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 10px;
}

.fact-card {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: none;
}

.fact-label {
  display: inline-block;
  margin-bottom: 12px;
  color: var(--accent);
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.fact-card h3,
.paper-row h3 {
  margin: 0 0 10px;
  font-size: 1.3rem;
  line-height: 1.3;
}

.fact-card p,
.paper-row p {
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
}

.section-body p,
.notes-grid p,
.contact p,
.work-item p {
  margin: 0;
  color: var(--muted);
  line-height: 1.58;
  font-size: 0.97rem;
}

.work-rail {
  display: grid;
  gap: 7px;
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
  list-style: disc;
}

.work-item {
  display: list-item;
  padding: 2px 0;
}

.work-item:first-child {
  padding-top: 0;
}

.work-item h3,
.note-card h3 {
  margin: 0 0 3px;
  font-size: 1.05rem;
  font-weight: 700;
}

.work-item p {
  line-height: 1.55;
  font-size: 0.96rem;
}

.notes-head {
  display: block;
}

.notes-grid {
  margin-top: 30px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.note-card {
  padding: 24px;
  min-height: 240px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--surface);
  box-shadow: none;
}

.paper-list {
  margin-top: 10px;
  display: grid;
  gap: 6px;
}

.paper-row {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 2px 0;
}

.paper-row p {
  line-height: 1.5;
}

.paper-row a {
  color: var(--accent);
  font-weight: 700;
  text-decoration: none;
}

.paper-row a:hover,
.paper-row a:focus-visible {
  text-decoration: underline;
}

.plain-list {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.58;
}

.profile-list {
  list-style: none;
  padding-left: 0;
}

.profile-entry {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  gap: 14px;
  padding: 3px 0;
}

.profile-entry-period {
  color: var(--accent);
  font-weight: 700;
  white-space: nowrap;
}

.profile-entry-detail {
  color: var(--muted);
}

.students-groups {
  display: grid;
  gap: 14px;
}

.student-group {
  display: grid;
  gap: 6px;
}

.student-group-title {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
}

.student-group-empty {
  margin: 0;
  color: var(--muted);
  line-height: 1.58;
}

.student-group .plain-list {
  list-style: none;
  padding-left: 0;
}

.student-entry {
  display: grid;
  grid-template-columns: minmax(88px, auto) auto;
  align-items: baseline;
  gap: 4px;
}

.student-entry-name {
  min-width: 0;
  color: var(--ink);
  text-decoration: none;
}

.student-entry-period {
  color: var(--muted);
  white-space: nowrap;
}

a.student-entry-name {
  color: var(--accent);
}

a.student-entry-name:hover,
a.student-entry-name:focus-visible {
  color: var(--accent);
  text-decoration: underline;
}

.plain-list a {
  color: var(--accent);
  text-decoration: none;
}

.plain-list a:hover,
.plain-list a:focus-visible {
  text-decoration: underline;
}

.paper-year {
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.contact {
  padding-bottom: 26px;
}

.contact p {
  max-width: 42rem;
  margin: 10px 0 12px;
}

.contact-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(260px, 0.85fr);
  gap: 20px;
  align-items: center;
}

.contact-photo-card {
  margin: 0;
  padding: 5px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-strong);
  box-shadow: var(--shadow);
}

.contact-photo {
  display: block;
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  object-position: center;
  border-radius: 12px;
}

.contact-photo-stack {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  max-width: 300px;
  justify-self: end;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .button,
  .site-nav a::after {
    transition: none;
  }
}

@media (max-width: 980px) {
  .hero,
  .section-grid,
  .notes-grid,
  .fact-grid,
  .contact-layout {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 22px;
  }

  .hero-panel {
    max-width: 560px;
  }

  .hero-side {
    max-width: 560px;
    padding-top: 0;
  }

  .contact-photo-stack {
    justify-self: start;
  }
}

@media (max-width: 720px) {
  .page-shell {
    width: min(calc(100% - 28px), var(--max));
  }

  .site-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .header-actions {
    align-items: flex-start;
    flex-direction: column;
    gap: 7px;
  }

  .site-nav {
    flex-wrap: wrap;
    gap: 9px 14px;
  }

  .hero h1 {
    max-width: 10ch;
    font-size: clamp(2.15rem, 10vw, 3rem);
  }

  .hero-text {
    font-size: 0.97rem;
  }

  .work-item {
    padding: 1px 0;
  }

  .paper-row {
    grid-template-columns: 1fr;
    gap: 3px;
  }

  .student-entry {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  .profile-entry {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  .note-card {
    min-height: auto;
  }
}