/* Genμ 2.0 — academic site styling, aligned with the 2025 edition */
:root {
  --text: #333333;
  --muted: #666666;
  --link: #1a73e8;
  --line: #e0e0e0;
  --soft-line: #ececec;
  --soft-bg: #f8fafc;
  --notice-bg: #f7faff;
  --max-width: 940px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: #ffffff;
  color: var(--text);
  font-family: Roboto, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; }
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible { outline: 2px solid var(--link); outline-offset: 3px; }

.container {
  width: min(100% - 40px, var(--max-width));
  margin: 0 auto;
  padding: 24px 0 36px;
}

/* Masthead */
.site-masthead {
  padding: 0 0 14px;
  border-bottom: 1px solid var(--line);
}
.brandbox { display: block; }
.brandmark { display: none; }
.brandtext .kicker {
  margin-bottom: 3px;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 500;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}
.brandtext h1 {
  margin: 0;
  color: #444444;
  font-size: clamp(2rem, 5vw, 2.5rem);
  font-weight: 500;
  line-height: 1.2;
}
.brandtext p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 0.98rem;
}
.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}
.logo-row {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 18px;
}
.logo-row a { display: inline-flex; align-items: center; }
.logo-row img {
  width: auto;
  height: 62px;
  object-fit: contain;
}
.logo-row a:first-child img { height: 72px; }
nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px 18px;
  margin: 0 !important;
}
nav a {
  color: var(--text);
  font-size: 0.98rem;
  font-weight: 400;
  line-height: 1.35;
  white-space: nowrap;
}
nav a:hover,
nav a.active {
  color: var(--link);
  text-decoration: underline;
  text-underline-offset: 4px;
}
nav a.prev-year {
  color: var(--muted);
  font-size: 0.9rem;
}

.challenge-notice {
  margin: 18px 0 0;
  padding: 10px 14px;
  background: var(--notice-bg);
  border-left: 3px solid var(--link);
  color: #3f4b5a;
  font-size: 0.94rem;
}
.challenge-notice strong { color: #1f4f96; }

/* Intro blocks */
.hero {
  margin: 34px 0 0;
  padding: 0;
  background: transparent;
  border: 0;
  border-radius: 0;
  box-shadow: none;
}
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(230px, 0.55fr);
  gap: 38px;
  align-items: start;
}
.chip {
  display: inline-block;
  padding: 0;
  background: transparent;
  border-radius: 0;
  color: var(--link);
  font-size: 0.76rem;
  font-weight: 500;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}
.hero h2 {
  margin: 7px 0 14px;
  color: #2f2f2f;
  font-size: clamp(1.85rem, 4vw, 2.35rem);
  font-weight: 500;
  line-height: 1.25;
}
.hero p {
  margin: 0 0 13px;
  color: var(--text);
  font-size: 1.05rem;
}
.hero-card {
  padding: 0 0 0 24px;
  background: transparent;
  border: 0;
  border-left: 1px solid var(--line);
  border-radius: 0;
  box-shadow: none;
}
.hero-card .stat {
  padding: 0 0 14px;
  margin: 0 0 14px;
  border-bottom: 1px solid var(--soft-line);
}
.hero-card .stat:last-child { margin-bottom: 0; padding-bottom: 0; border-bottom: 0; }
.hero-card .stat b {
  display: block;
  margin: 0 0 3px;
  color: #3b3b3b;
  font-size: 1rem;
  font-weight: 500;
}
.hero-card .stat span { color: var(--muted); font-size: 0.93rem; }

/* Main content */
.section { margin-top: 38px; }
.section > h3,
.section h3:first-child {
  margin: 0 0 15px;
  padding-bottom: 7px;
  border-bottom: 1px solid var(--line);
  color: #333333;
  font-size: 1.55rem;
  font-weight: 600;
  letter-spacing: 0;
  text-transform: none;
}
.section .lead {
  margin: -4px 0 18px;
  color: var(--muted);
  font-size: 1rem;
}
.section-label {
  margin: 28px 0 14px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--soft-line);
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.grid-2,
.grid-3,
.timeline,
.dates-grid {
  display: grid;
  gap: 16px;
}
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.timeline,
.dates-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.card,
.date-card {
  padding: 18px;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 2px;
  box-shadow: none;
}
.card h4 {
  margin: 0 0 8px;
  color: #333333;
  font-size: 1.08rem;
  font-weight: 600;
}
.card p { margin: 0; color: var(--muted); }
.card ul { margin: 10px 0 0 20px; padding: 0; }
.card li { margin-bottom: 5px; }
.card .num { padding-left: 0; }

.badge,
.role-tag {
  display: inline-block;
  margin-bottom: 8px;
  padding: 0;
  background: transparent !important;
  border: 0;
  border-radius: 0;
  color: var(--link) !important;
  font-size: 0.76rem;
  font-weight: 500;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.callout {
  margin-top: 18px;
  padding: 12px 15px;
  background: #fffdf5;
  border: 0;
  border-left: 3px solid #c89a2b;
  border-radius: 0;
  color: #5f4a1d;
}
.callout a { color: #805e12; text-decoration: underline; }

.link-row {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin-top: 16px;
}
.link-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 7px 12px;
  background: #ffffff !important;
  border: 1px solid #cfd8e5 !important;
  border-radius: 3px;
  color: var(--link) !important;
  font-size: 0.9rem;
  font-weight: 500;
}
.link-btn:hover { background: var(--soft-bg) !important; text-decoration: none; }

.date-card { text-align: left; }
.date-card .d-label {
  margin-bottom: 5px;
  color: var(--link);
  font-size: 0.74rem;
  font-weight: 500;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}
.date-card .d-date { margin-bottom: 4px; color: #333; font-size: 1rem; font-weight: 600; }
.date-card .d-desc { color: var(--muted); font-size: 0.88rem; }

/* Tables and formulae */
.table-wrap {
  overflow-x: auto;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 0;
  box-shadow: none;
}
table { width: 100%; border-collapse: collapse; }
.table-wrap table { min-width: 700px; }
th,
td {
  padding: 11px 12px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}
th {
  background: var(--soft-bg);
  color: #444;
  font-size: 0.9rem;
  font-weight: 600;
}
tr:last-child td { border-bottom: 0; }

.def-table { width: 100%; margin-top: 12px; border-collapse: collapse; }
.def-table td { padding: 8px 9px; border-bottom: 1px solid var(--soft-line); font-size: 0.94rem; }
.def-table td:first-child {
  padding-right: 16px;
  color: #375f91;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-weight: 600;
  white-space: nowrap;
}
.formula-box {
  margin: 14px 0;
  padding: 13px 15px;
  overflow-x: auto;
  background: var(--soft-bg);
  border: 1px solid var(--line);
  border-radius: 2px;
  color: var(--text);
}
.acro-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 9px; margin-top: 12px; }
.acro-item { padding: 9px 11px; background: #fff; border: 1px solid var(--soft-line); border-radius: 2px; font-size: 0.92rem; }
.acro-item strong { color: #375f91; }
.mjx-container { max-width: 100%; overflow-x: auto; overflow-y: hidden; }
.formula-box mjx-container { margin: 0.2em 0 !important; font-size: 1.02em; }

/* Organizers */
.person-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 30px 22px;
  margin-top: 18px;
}
.person {
  padding: 0;
  background: transparent;
  border: 0;
  border-radius: 0;
  box-shadow: none;
  text-align: center;
}
.person img {
  display: block;
  width: 150px;
  height: 150px;
  margin: 0 auto 11px;
  border: 0;
  border-radius: 50%;
  object-fit: cover;
  object-position: center;
}
.person h4 { margin: 3px 0 3px; font-size: 1.08rem; font-weight: 600; }
.person p { margin: 0 auto; max-width: 240px; color: var(--muted); font-size: 0.91rem; }

/* FAQ */
.faq-item { padding: 17px 0; border-bottom: 1px solid var(--soft-line); }
.faq-item:first-child { padding-top: 0; }
.faq-item:last-child { padding-bottom: 0; border-bottom: 0; }
.faq-item h4 { margin: 0 0 5px; font-size: 1.05rem; font-weight: 600; }
.faq-item p { margin: 0; color: var(--muted); }

.footer {
  margin: 44px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.92rem;
}

@media (max-width: 860px) {
  .container { width: min(100% - 32px, var(--max-width)); }
  .header-row { align-items: flex-start; flex-direction: column; gap: 14px; }
  nav { justify-content: flex-start; }
  .hero-grid { grid-template-columns: 1fr; gap: 24px; }
  .hero-card { padding: 18px 0 0; border-left: 0; border-top: 1px solid var(--line); }
  .grid-3, .timeline, .dates-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .person-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 600px) {
  body { font-size: 15.5px; }
  .container { width: min(100% - 24px, var(--max-width)); padding-top: 18px; }
  .brandtext h1 { font-size: 1.9rem; }
  .logo-row { width: 100%; justify-content: space-between; gap: 12px; }
  .logo-row img { height: 50px; }
  .logo-row a:first-child img { height: 58px; }
  nav { gap: 8px 14px; }
  nav a { font-size: 0.92rem; }
  .challenge-notice { font-size: 0.9rem; }
  .hero { margin-top: 28px; }
  .hero h2 { font-size: 1.72rem; }
  .grid-2, .grid-3, .timeline, .dates-grid, .acro-grid { grid-template-columns: 1fr; }
  .person-grid { grid-template-columns: 1fr; gap: 28px; }
  .person img { width: 132px; height: 132px; }
  .section { margin-top: 32px; }
  .section > h3, .section h3:first-child { font-size: 1.38rem; }
}

/* Keep long mathematical notation contained on narrow screens. */
.hero-grid > *,
.grid-2 > *,
.grid-3 > *,
.timeline > *,
.dates-grid > *,
.section,
.card { min-width: 0; }
.card, .section, td { overflow-wrap: anywhere; }

@media (max-width: 600px) {
  .def-table { table-layout: fixed; }
  .def-table td:first-child {
    width: 35%;
    white-space: normal;
    overflow-wrap: anywhere;
  }
  .def-table td { word-break: break-word; }
}


/* Submission workflow */
.form-actions { margin-top: 18px; }
.form-link.is-disabled, .form-link[aria-disabled="true"] {
  color: #6f7780;
  background: #f3f4f5;
  border-color: #cfd3d7;
  cursor: not-allowed;
  text-decoration: none;
}
.form-admin-note, .small-note { margin-top: 12px; color: var(--muted); font-size: 0.9rem; }
code { padding: 0.08em 0.28em; background: var(--soft-bg); border: 1px solid var(--soft-line); border-radius: 2px; font-size: 0.92em; }
.table-wrap code { white-space: nowrap; }