/* =========================================================
   APBEC 2026 Symposium — Shared Stylesheet
   Colors from SNU Medicine logo:
     Navy  : #2C3E70  (primary / dark)
     Green : #5B8C6A  (accent)
     Light : #EAF0F6  (background light)
   ========================================================= */

@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:wght@400;600;700&family=Inter:wght@300;400;500;600;700&display=swap');

/* ---------- Reset & Base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --navy: #2C3E70;
  --navy-dark: #1b2748;
  --navy-mid: #3d5490;
  --green: #5B8C6A;
  --green-dark: #3e6349;
  --green-light: #87b897;
  --light: #EAF0F6;
  --white: #ffffff;
  --gray-100: #f8f9fc;
  --gray-200: #e8eef5;
  --gray-400: #9aafc5;
  --gray-600: #5a6e87;
  --gray-800: #2d3748;
  --text: #1e2a3a;
  --shadow-sm: 0 2px 8px rgba(44, 62, 112, .12);
  --shadow-md: 0 8px 32px rgba(44, 62, 112, .16);
  --shadow-lg: 0 20px 60px rgba(44, 62, 112, .22);
  --radius: 10px;
  --radius-lg: 20px;
  --transition: .3s ease;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', sans-serif;
  color: var(--text);
  background: var(--white);
  line-height: 1.65;
  min-height: 100vh;
}

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

img {
  max-width: 100%;
  display: block;
}

ul {
  list-style: none;
}

/* ---------- Typography ---------- */
h1,
h2,
h3,
h4 {
  font-family: 'Playfair Display', serif;
  line-height: 1.2;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.6rem);
  font-weight: 700;
}

h2 {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 600;
}

h3 {
  font-size: clamp(1.2rem, 2vw, 1.6rem);
}

p {
  font-size: 1rem;
}

/* ---------- Header / Navigation ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, .96);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(44, 62, 112, .12);
  box-shadow: var(--shadow-sm);
  transition: background var(--transition);
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Logo */
.site-logo {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-shrink: 0;
}

.site-logo .logo-main {
  height: 44px;
  width: auto;
  object-fit: contain;
}

.site-logo .logo-symposium {
  height: 48px;
  width: auto;
  object-fit: contain;
}

.logo-divider {
  width: 1px;
  height: 32px;
  background: var(--gray-400);
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.logo-text .sym-name {
  font-family: 'Playfair Display', serif;
  font-size: 1rem;
  font-weight: 700;
  color: var(--navy);
  letter-spacing: .02em;
}

.logo-text .sym-year {
  font-size: .78rem;
  color: var(--green);
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
}

/* Nav */
.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  padding: 8px 14px;
  font-size: .88rem;
  font-weight: 500;
  color: var(--gray-800);
  border-radius: 6px;
  transition: background var(--transition), color var(--transition);
  white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
  background: var(--light);
  color: var(--navy);
}

.nav-link.btn-register {
  background: var(--green);
  color: var(--white);
  margin-left: 8px;
  padding: 8px 18px;
}

.nav-link.btn-register:hover {
  background: var(--green-dark);
}

/* Hamburger */
.nav-toggle {
  display: none;
  cursor: pointer;
  background: none;
  border: none;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--navy);
  border-radius: 2px;
  margin: 5px 0;
  transition: transform var(--transition), opacity var(--transition);
}

/* Mobile Nav */
@media (max-width: 1120px) {
  .nav-toggle {
    display: block;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    align-items: stretch;
    padding: 12px 24px 24px;
    border-bottom: 2px solid var(--light);
    box-shadow: var(--shadow-md);
  }

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

  .nav-link {
    padding: 12px 8px;
    border-bottom: 1px solid var(--gray-200);
    border-radius: 0;
  }

  .nav-link.btn-register {
    margin: 12px 0 0;
    border-radius: var(--radius);
    border: none;
    text-align: center;
  }
}

/* ---------- Page wrapper ---------- */
.page-wrapper {
  padding-top: 72px;
}

/* ---------- Hero (used by index.html) ---------- */
.hero {
  position: relative;
  min-height: calc(100vh - 72px);
  display: flex;
  align-items: center;
  overflow: hidden;
  background-color: var(--navy-dark);
  background-image: url('../images/main-banner.jpeg');
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(27, 39, 72, 0.8), rgba(27, 39, 72, 0.4));
  z-index: 1;
}

/* Animated floating particles */
.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle, rgba(255, 255, 255, .08) 1px, transparent 1px),
    radial-gradient(circle, rgba(255, 255, 255, .05) 1px, transparent 1px);
  background-size: 60px 60px, 30px 30px;
  animation: particleFloat 20s linear infinite;
}

@keyframes particleFloat {
  0% {
    transform: translateY(0);
  }

  100% {
    transform: translateY(-60px);
  }
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1280px;
  margin: 0 auto;
  padding: 80px 24px;
  text-align: center;
  color: var(--white);
}

.hero-badge {
  display: inline-block;
  background: rgba(255, 255, 255, .15);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, .25);
  border-radius: 50px;
  padding: 8px 24px;
  font-size: .85rem;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  margin-bottom: 28px;
  color: rgba(255, 255, 255, .9);
}

.hero-title {
  font-family: 'Playfair Display', serif;
  font-size: clamp(1.8rem, 5vw, 3.8rem);
  font-weight: 700;
  margin-bottom: 12px;
  text-shadow: 0 4px 30px rgba(0, 0, 0, 0.8), 0 0 20px rgba(0, 0, 0, 0.4);
}

.hero-title .accent {
  color: #9ecfaf;
}

.hero-subtitle {
  font-size: clamp(1.0rem, 2.5vw, 1.4rem);
  font-weight: 400;
  color: #fff;
  margin-bottom: 36px;
  letter-spacing: .02em;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.8);
}

.hero-date-venue {
  display: flex;
  justify-content: center;
  gap: 40px;
  margin-bottom: 52px;
  flex-wrap: wrap;
}

.hero-date-venue .dv-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.05rem;
  color: rgba(255, 255, 255, .9);
}

.hero-date-venue .dv-icon {
  width: 36px;
  height: 36px;
  background: rgba(255, 255, 255, .15);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}

/* Countdown */
.countdown {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.countdown-unit {
  background: rgba(255, 255, 255, .12);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, .2);
  border-radius: var(--radius-lg);
  padding: 20px 32px;
  min-width: 100px;
  text-align: center;
}

.countdown-num {
  font-size: 2.8rem;
  font-weight: 700;
  font-family: 'Inter', sans-serif;
  line-height: 1;
  color: #9ecfaf;
}

.countdown-label {
  font-size: .78rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, .7);
  margin-top: 6px;
}

.hero-ctas {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-ctas .btn-submitted-abstract {
  flex-basis: 100%;
  width: fit-content;
  margin: 4px auto 0;
  border-color: rgba(158, 207, 175, .72);
  background: rgba(27, 39, 72, .22);
  color: var(--white);
}

.hero-ctas .btn-submitted-abstract:hover {
  border-color: #9ecfaf;
  background: rgba(158, 207, 175, .16);
}

.btn-primary {
  background: var(--green);
  color: var(--white);
  border: 2px solid var(--green);
  padding: 14px 36px;
  border-radius: 50px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  display: inline-block;
}

.btn-primary:hover {
  background: var(--green-dark);
  border-color: var(--green-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(91, 140, 106, .4);
}

.btn-outline {
  background: transparent;
  color: var(--white);
  border: 2px solid rgba(255, 255, 255, .5);
  padding: 14px 36px;
  border-radius: 50px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  display: inline-block;
}

.btn-outline:hover {
  border-color: var(--white);
  background: rgba(255, 255, 255, .1);
  transform: translateY(-2px);
}

/* ---------- Section Common ---------- */
.section {
  padding: 96px 24px;
}

.section-alt {
  background: var(--gray-100);
}

.section-dark {
  background: var(--navy);
  color: var(--white);
}

.container {
  max-width: 1280px;
  margin: 0 auto;
}

.container-sm {
  max-width: 860px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-tag {
  display: inline-block;
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .15em;
  text-transform: uppercase;
  color: var(--green);
  background: rgba(91, 140, 106, .1);
  border-radius: 50px;
  padding: 6px 18px;
  margin-bottom: 16px;
}

.section-dark .section-tag {
  color: #9ecfaf;
  background: rgba(158, 207, 175, .15);
}

.section-title {
  color: var(--navy);
}

.section-dark .section-title {
  color: var(--white);
}

.section-lead {
  color: var(--gray-600);
  font-size: 1.08rem;
  margin-top: 16px;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}

.section-dark .section-lead {
  color: rgba(255, 255, 255, .7);
}

.divider-line {
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--navy), var(--green));
  border-radius: 2px;
  margin: 20px auto 0;
}

/* ---------- Cards ---------- */
.card {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow var(--transition), transform var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

/* ---------- Speaker Cards ---------- */
.speaker-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
}

.speaker-card {
  text-align: center;
  padding: 40px 28px 32px;
  border-radius: var(--radius-lg);
  background: var(--white);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition);
  border: 1px solid var(--gray-200);
}

.speaker-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-6px);
}

.speaker-avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  margin: 0 auto 20px;
  overflow: hidden;
  border: 4px solid var(--light);
  box-shadow: 0 4px 16px rgba(44, 62, 112, .2);
}

.speaker-avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.speaker-avatar-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.4rem;
  font-weight: 700;
  font-family: 'Playfair Display', serif;
  color: var(--white);
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-mid) 50%, var(--green) 100%);
}

.speaker-name {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 6px;
}

.speaker-title {
  font-size: .88rem;
  color: var(--green-dark);
  font-weight: 600;
  margin-bottom: 4px;
}

.speaker-affil {
  font-size: .84rem;
  color: var(--gray-600);
  margin-bottom: 16px;
}

.speaker-bio {
  font-size: .9rem;
  color: var(--gray-600);
  line-height: 1.65;
}

.speaker-tag {
  display: inline-block;
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  padding: 4px 12px;
  border-radius: 50px;
  margin-bottom: 16px;
}

.tag-keynote {
  background: rgba(44, 62, 112, .1);
  color: var(--navy);
}

.tag-young {
  background: rgba(91, 140, 106, .12);
  color: var(--green-dark);
}

/* ---------- Program Table ---------- */
.submitted-abstract-section {
  background:
    linear-gradient(180deg, rgba(234, 240, 246, .72) 0%, rgba(255, 255, 255, 1) 42%),
    var(--white);
}

.submitted-abstract-section .section-header {
  margin-bottom: 48px;
}

.submitted-abstract-section .section-title {
  font-size: clamp(2rem, 4vw, 3rem);
}

.abstract-chart-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
  align-items: stretch;
}

.abstract-chart-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: 34px;
}

.abstract-chart-card:first-child {
  order: 2;
}

.abstract-chart-card:last-child {
  order: 1;
}

.abstract-chart-copy {
  text-align: center;
  margin-bottom: 24px;
}

.abstract-chart-copy h2,
.abstract-chart-copy h3 {
  color: var(--navy);
  font-family: 'Inter', sans-serif;
  font-size: 1.15rem;
  font-weight: 700;
}

.pie-chart-wrap {
  display: flex;
  justify-content: center;
  margin: 0 auto 22px;
}

.pie-chart-svg {
  display: block;
  width: min(280px, 72vw);
  aspect-ratio: 1;
  border-radius: 50%;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .7), 0 16px 36px rgba(44, 62, 112, .16);
}

.pie-chart-svg path {
  stroke: rgba(255, 255, 255, .9);
  stroke-width: 1.6;
  stroke-linejoin: round;
}

.pie-chart-svg text {
  color: var(--white);
  dominant-baseline: middle;
  fill: var(--white);
  font-family: 'Inter', sans-serif;
  font-size: 10px;
  font-weight: 700;
  paint-order: stroke;
  stroke: rgba(0, 0, 0, .26);
  stroke-width: 2px;
  text-anchor: middle;
}

.abstract-response-count {
  color: var(--gray-600);
  font-size: .88rem;
  font-weight: 600;
  text-align: center;
  margin: -8px 0 18px;
}

.abstract-legend {
  display: grid;
  gap: 10px;
  max-width: 520px;
  margin: 0 auto;
}

.abstract-legend li {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr) auto;
  gap: 10px;
  align-items: start;
  color: var(--gray-800);
  font-size: .86rem;
  line-height: 1.35;
}

.abstract-legend strong {
  color: var(--navy);
  font-size: .82rem;
  font-weight: 700;
  white-space: nowrap;
}

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  margin-top: .25em;
  box-shadow: 0 0 0 3px rgba(44, 62, 112, .06);
}

@media (max-width: 900px) {
  .abstract-chart-grid {
    grid-template-columns: 1fr;
  }

  .abstract-chart-card {
    padding: 28px 22px;
  }
}

@media (max-width: 520px) {
  .hero-ctas .btn-submitted-abstract {
    width: 100%;
  }

  .abstract-legend li {
    grid-template-columns: 12px minmax(0, 1fr);
  }

  .abstract-legend strong {
    grid-column: 2;
  }
}

.screen-reader-text {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.program-banner-tag {
  color: #9ecfaf;
  background: rgba(158, 207, 175, .2);
}

.program-section {
  background: var(--gray-100);
}

.program-section,
.poster-section,
.submitted-abstract-section,
.program-day-card {
  scroll-margin-top: 88px;
}

.program-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 34px;
  padding: 18px 20px;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.program-jump-nav,
.program-downloads {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.program-jump-nav a {
  color: var(--navy);
  font-size: .86rem;
  font-weight: 700;
  padding: 8px 12px;
  border-radius: 6px;
  transition: color var(--transition), background var(--transition);
}

.program-jump-nav a:hover {
  color: var(--green-dark);
  background: rgba(91, 140, 106, .1);
}

.program-download-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  color: var(--white);
  background: var(--green);
  border: 1px solid var(--green);
  border-radius: 6px;
  padding: 8px 14px;
  font-size: .82rem;
  font-weight: 700;
  transition: background var(--transition), border-color var(--transition);
}

.program-download-link:hover {
  background: var(--green-dark);
  border-color: var(--green-dark);
}

.program-download-secondary {
  color: var(--navy);
  background: var(--white);
  border-color: var(--gray-400);
}

.program-download-secondary:hover {
  color: var(--white);
  background: var(--navy);
  border-color: var(--navy);
}

.program-day-card {
  margin-bottom: 38px;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  background: var(--white);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.program-day-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  padding: 24px 28px;
  color: var(--white);
  background: linear-gradient(100deg, var(--navy-dark), var(--navy) 65%, var(--green-dark));
}

.program-day-header h3 {
  margin-top: 4px;
  color: var(--white);
  font-size: clamp(1.35rem, 2.3vw, 1.9rem);
}

.program-day-kicker,
.program-venue-label {
  display: block;
  color: #b8dfc6;
  font-size: .72rem;
  font-weight: 800;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.program-venue {
  min-width: 250px;
  padding-left: 24px;
  border-left: 1px solid rgba(255, 255, 255, .22);
  text-align: right;
}

.program-venue strong,
.program-venue span:last-child {
  display: block;
}

.program-venue strong {
  font-size: .94rem;
}

.program-venue span:last-child {
  color: rgba(255, 255, 255, .72);
  font-size: .84rem;
}

.program-table-scroll,
.poster-table-scroll {
  overflow-x: auto;
  overscroll-behavior-inline: contain;
}

.program-table-scroll:focus-visible,
.poster-table-scroll:focus-visible {
  outline: 3px solid rgba(91, 140, 106, .45);
  outline-offset: -3px;
}

.program-schedule-table,
.poster-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--white);
}

.program-schedule-table {
  min-width: 920px;
}

.program-schedule-table thead th,
.poster-table thead th {
  padding: 12px 16px;
  color: var(--navy);
  background: var(--light);
  border-bottom: 2px solid #d4dfeb;
  font-size: .72rem;
  font-weight: 800;
  letter-spacing: .09em;
  text-align: left;
  text-transform: uppercase;
}

.program-schedule-table thead th:first-child {
  width: 92px;
}

.program-schedule-table thead th:nth-child(2) {
  width: 280px;
}

.program-schedule-table thead th:nth-child(3) {
  width: 100px;
  text-align: center;
}

.program-schedule-table tbody + tbody {
  border-top: 3px solid var(--light);
}

.program-schedule-table td,
.program-schedule-table tbody th {
  padding: 16px;
  border-bottom: 1px solid var(--gray-200);
  vertical-align: top;
}

.program-schedule-table tbody tr:last-child td,
.program-schedule-table tbody tr:last-child th {
  border-bottom: 0;
}

.program-start {
  color: var(--green-dark);
  background: rgba(91, 140, 106, .05);
  font-size: .9rem;
  font-weight: 800;
  text-align: left;
  white-space: nowrap;
}

.program-session {
  border-left: 1px solid var(--gray-200);
  border-right: 1px solid var(--gray-200);
}

.program-session > strong,
.program-session > span {
  display: block;
}

.program-session > strong {
  color: var(--navy);
  font-size: .93rem;
}

.program-session > span {
  margin-top: 3px;
  color: var(--gray-600);
  font-size: .8rem;
  line-height: 1.5;
}

.program-chair {
  margin-top: 10px;
  padding-top: 9px;
  border-top: 1px solid var(--gray-200);
  font-size: .78rem;
  line-height: 1.45;
}

.program-chair span,
.program-chair strong {
  display: block;
}

.program-chair span {
  color: var(--green-dark);
  font-size: .68rem;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.program-chair strong {
  margin-top: 2px;
  color: var(--navy);
  font-weight: 700;
}

.program-duration {
  color: var(--green-dark);
  font-size: .83rem;
  font-weight: 700;
  text-align: center;
  white-space: nowrap;
}

.program-detail {
  font-size: .87rem;
}

.program-speaker strong {
  color: var(--navy);
}

.program-speaker > span:not(.student-mark):not(.screen-reader-text) {
  color: var(--gray-600);
}

.student-mark {
  color: #a45122;
  font-weight: 800;
}

.program-talk-title {
  margin-top: 3px;
  color: var(--gray-800);
  line-height: 1.5;
}

.program-talk-detail {
  color: var(--gray-800);
  font-weight: 500;
}

.program-group-break td,
.program-group-break th {
  background: #fbfcfe;
}

.program-footnote {
  margin-top: -18px;
  color: var(--gray-600);
  font-size: .84rem;
  text-align: right;
}

.poster-section {
  background: var(--white);
}

.poster-tracks {
  display: grid;
  gap: 20px;
}

.poster-track {
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  background: var(--white);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.poster-track summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 21px 24px;
  color: var(--navy);
  background: var(--gray-100);
  cursor: pointer;
  font-size: .98rem;
  font-weight: 700;
  list-style: none;
}

.poster-track summary::-webkit-details-marker {
  display: none;
}

.poster-track summary::after {
  content: '+';
  flex: 0 0 auto;
  width: 26px;
  height: 26px;
  color: var(--white);
  background: var(--green);
  border-radius: 50%;
  font-size: 1.1rem;
  line-height: 25px;
  text-align: center;
}

.poster-track[open] summary::after {
  content: '−';
}

.poster-track summary strong {
  margin-left: auto;
  color: var(--green-dark);
  font-size: .76rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  white-space: nowrap;
}

.poster-table {
  min-width: 980px;
}

.poster-table thead th:first-child {
  width: 64px;
  text-align: center;
}

.poster-table thead th:nth-child(2) {
  width: 55%;
}

.poster-table thead th:nth-child(3) {
  width: 180px;
}

.poster-table thead th:nth-child(4) {
  width: 270px;
}

.poster-table td,
.poster-table tbody th {
  padding: 14px 16px;
  border-bottom: 1px solid var(--gray-200);
  font-size: .83rem;
  line-height: 1.5;
  text-align: left;
  vertical-align: top;
}

.poster-table tbody th {
  color: var(--green-dark);
  background: rgba(91, 140, 106, .045);
  font-weight: 800;
  text-align: center;
}

.poster-table tbody td:nth-child(2) {
  color: var(--gray-800);
  font-weight: 500;
}

.poster-table tbody td:nth-child(3) {
  color: var(--navy);
  font-weight: 700;
}

.poster-table tbody tr:hover td,
.poster-table tbody tr:hover th {
  background: #fbfcfe;
}

@media (max-width: 760px) {
  .program-toolbar,
  .program-day-header {
    align-items: stretch;
    flex-direction: column;
  }

  .program-toolbar {
    padding: 16px;
  }

  .program-jump-nav,
  .program-downloads {
    width: 100%;
  }

  .program-downloads a {
    flex: 1 1 130px;
  }

  .program-day-header {
    padding: 22px 20px;
  }

  .program-venue {
    min-width: 0;
    padding-top: 14px;
    padding-left: 0;
    border-top: 1px solid rgba(255, 255, 255, .22);
    border-left: 0;
    text-align: left;
  }

  .poster-track summary {
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 10px;
    padding: 18px;
  }

  .poster-track summary strong {
    margin-left: 0;
  }

  .poster-track summary::after {
    margin-left: auto;
  }
}

@media print {
  .site-header,
  .site-footer,
  .program-toolbar,
  .back-to-top,
  .submitted-abstract-section {
    display: none !important;
  }

  .program-table-scroll,
  .poster-table-scroll {
    overflow: visible;
  }

  .program-schedule-table,
  .poster-table {
    min-width: 0;
  }

  .program-day-card,
  .poster-track {
    break-inside: avoid;
    box-shadow: none;
  }
}

/* ---------- Registration ---------- */
.registration-methods-section {
  background: var(--white);
}

.registration-methods,
.registration-google-card {
  display: grid;
  gap: 28px;
}

.registration-methods {
  grid-template-columns: minmax(0, .85fr) minmax(0, 1.35fr);
  align-items: stretch;
}

.registration-methods-single {
  grid-template-columns: minmax(0, 860px);
  justify-content: center;
}

.registration-method-card {
  padding: 34px;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  background: var(--white);
  box-shadow: var(--shadow-sm);
}

.registration-method-card h3 {
  margin: 10px 0;
  color: var(--navy);
}

.registration-method-card p {
  color: var(--gray-600);
}

.registration-method-number {
  display: inline-block;
  color: var(--green-dark);
  font-size: .72rem;
  font-weight: 800;
  letter-spacing: .13em;
  text-transform: uppercase;
}

.registration-method-button {
  margin-top: 24px;
}

.registration-google-card {
  grid-template-columns: minmax(0, 1fr) 220px;
  align-items: center;
  background:
    linear-gradient(135deg, rgba(234, 240, 246, .65), rgba(255, 255, 255, .95)),
    var(--white);
  border-color: rgba(91, 140, 106, .28);
}

.registration-qr-link {
  display: block;
  padding: 14px;
  border: 1px solid var(--gray-200);
  border-radius: 14px;
  background: var(--white);
  box-shadow: var(--shadow-sm);
  text-align: center;
  transition: box-shadow var(--transition), transform var(--transition);
}

.registration-qr-link:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.registration-qr-link img {
  width: 100%;
  height: auto;
  aspect-ratio: 1;
  object-fit: contain;
}

.registration-qr-link span {
  display: block;
  margin-top: 8px;
  color: var(--navy);
  font-size: .78rem;
  font-weight: 700;
}

@media (max-width: 900px) {
  .registration-methods {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .registration-method-card {
    padding: 28px 22px;
  }

  .registration-google-card {
    grid-template-columns: 1fr;
  }

  .registration-qr-link {
    width: min(100%, 240px);
    margin: 0 auto;
  }
}

/* ---------- Venue ---------- */
.venue-visual {
  width: 100%;
  height: 400px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
  background: linear-gradient(135deg, var(--navy-dark) 0%, var(--navy) 50%, var(--green-dark) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 48px;
  box-shadow: var(--shadow-lg);
}

.venue-visual-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--white);
  text-align: center;
  padding: 32px;
}

.venue-icon {
  font-size: 5rem;
  margin-bottom: 16px;
  opacity: .9;
}

.venue-name {
  font-size: 1.8rem;
  font-weight: 700;
  font-family: 'Playfair Display', serif;
}

.venue-address {
  font-size: 1rem;
  color: rgba(255, 255, 255, .8);
  margin-top: 8px;
}

.venue-info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.venue-info-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  gap: 18px;
  align-items: flex-start;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition);
}

.venue-info-card:hover {
  box-shadow: var(--shadow-md);
}

.venue-info-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--navy), var(--navy-mid));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  flex-shrink: 0;
  color: var(--white);
}

.venue-info-body h4 {
  color: var(--navy);
  font-size: 1rem;
  margin-bottom: 6px;
  font-family: 'Inter', sans-serif;
  font-weight: 600;
}

.venue-info-body p,
.venue-info-body a {
  font-size: .9rem;
  color: var(--gray-600);
  line-height: 1.6;
}

/* ---------- Organizing Committee ---------- */
.committee-section+.committee-section {
  margin-top: 56px;
}

.committee-role-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--navy);
  border-left: 4px solid var(--green);
  padding-left: 14px;
  margin-bottom: 20px;
  font-family: 'Inter', sans-serif;
}

.committee-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}

.committee-member {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 18px 20px;
  display: flex;
  align-items: center;
  gap: 14px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition);
}

.committee-member:hover {
  box-shadow: var(--shadow-md);
}

.member-initials {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--navy), var(--green));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-weight: 700;
  font-size: .9rem;
  flex-shrink: 0;
}

.member-info .name {
  font-weight: 600;
  font-size: .95rem;
  color: var(--text);
}

.member-info .affil {
  font-size: .8rem;
  color: var(--gray-600);
  margin-top: 2px;
}

/* ---------- Contact Form ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 48px;
  align-items: start;
}

@media (max-width: 800px) {
  .contact-grid {
    grid-template-columns: 1fr;
  }
}

.contact-info-card {
  background: linear-gradient(135deg, var(--navy), var(--navy-mid));
  color: var(--white);
  border-radius: var(--radius-lg);
  padding: 40px;
}

.contact-info-card h3 {
  font-size: 1.5rem;
  margin-bottom: 28px;
}

.contact-detail {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  margin-bottom: 24px;
}

.contact-icon {
  font-size: 1.3rem;
  margin-top: 2px;
}

.contact-detail .label {
  font-size: .8rem;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: rgba(255, 255, 255, .6);
}

.contact-detail .value {
  font-size: .95rem;
  color: var(--white);
  margin-top: 2px;
  line-height: 1.5;
}

.contact-form {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-md);
}

.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: .88rem;
  font-weight: 600;
  color: var(--gray-800);
  margin-bottom: 8px;
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius);
  font-family: 'Inter', sans-serif;
  font-size: .95rem;
  color: var(--text);
  background: var(--white);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  border-color: var(--navy);
  box-shadow: 0 0 0 3px rgba(44, 62, 112, .1);
}

.form-textarea {
  resize: vertical;
  min-height: 130px;
}

.form-grid2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

@media (max-width: 500px) {
  .form-grid2 {
    grid-template-columns: 1fr;
  }
}

/* ---------- Page Banner (inner pages) ---------- */
.page-banner {
  background: linear-gradient(135deg, var(--navy-dark) 0%, var(--navy) 60%, var(--green-dark) 100%);
  padding: 80px 24px 64px;
  text-align: center;
  color: var(--white);
  position: relative;
  overflow: hidden;
}

.page-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, rgba(255, 255, 255, .05) 1px, transparent 1px);
  background-size: 40px 40px;
}

.page-banner-content {
  position: relative;
  z-index: 1;
}

.page-banner h1 {
  font-size: clamp(1.8rem, 4vw, 3rem);
  margin-bottom: 12px;
}

.page-banner p {
  color: rgba(255, 255, 255, .75);
  font-size: 1.05rem;
  max-width: 600px;
  margin: 0 auto;
}

/* ---------- Info Cards (home) ---------- */
.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.info-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition);
}

.info-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.info-card-icon {
  width: 64px;
  height: 64px;
  border-radius: 18px;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
}

.icon-navy {
  background: rgba(44, 62, 112, .1);
}

.icon-green {
  background: rgba(91, 140, 106, .12);
}

.icon-amber {
  background: rgba(255, 193, 7, .15);
}

.info-card h3 {
  color: var(--navy);
  font-size: 1.05rem;
  font-family: 'Inter', sans-serif;
  font-weight: 700;
  margin-bottom: 8px;
}

.info-card p {
  font-size: .9rem;
  color: var(--gray-600);
}

.info-card a {
  color: var(--green);
  font-weight: 600;
  font-size: .88rem;
  display: inline-block;
  margin-top: 12px;
}

.info-card a:hover {
  color: var(--green-dark);
  text-decoration: underline;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--navy-dark);
  color: rgba(255, 255, 255, .75);
  padding: 60px 24px 32px;
}

.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
}

@media (max-width: 768px) {
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

.footer-brand img {
  height: 36px;
  filter: brightness(0) invert(1);
  margin-bottom: 16px;
}

.footer-brand .tagline {
  font-size: .9rem;
  line-height: 1.65;
}

.footer-brand .sym-full {
  font-size: 1rem;
  color: var(--white);
  font-weight: 700;
  margin-top: 12px;
}

.footer-col h4 {
  color: var(--white);
  font-size: .88rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  margin-bottom: 16px;
  font-family: 'Inter', sans-serif;
}

.footer-col li {
  margin-bottom: 10px;
}

.footer-col a {
  font-size: .88rem;
  color: rgba(255, 255, 255, .65);
  transition: color var(--transition);
}

.footer-col a:hover {
  color: #9ecfaf;
}

.footer-bottom {
  max-width: 1280px;
  margin: 40px auto 0;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, .1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: .82rem;
  color: rgba(255, 255, 255, .45);
}

/* ---------- About page ---------- */
.about-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

@media (max-width: 768px) {
  .about-intro {
    grid-template-columns: 1fr;
  }
}

.about-visual {
  border-radius: var(--radius-lg);
  overflow: hidden;
  height: 380px;
  position: relative;
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-mid) 50%, var(--green-dark) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
}

.about-visual-text {
  color: var(--white);
  text-align: center;
  padding: 32px;
}

.about-visual-text .big-year {
  font-size: 6rem;
  font-weight: 700;
  opacity: .15;
  position: absolute;
}

.about-visual-text .sym-icon {
  font-size: 4rem;
  margin-bottom: 16px;
}

.about-visual-text h3 {
  font-size: 1.4rem;
}

.about-visual-text p {
  font-size: .95rem;
  color: rgba(255, 255, 255, .75);
  margin-top: 8px;
}

.about-text h2 {
  color: var(--navy);
  margin-bottom: 20px;
}

.about-text p {
  color: var(--gray-600);
  margin-bottom: 16px;
}

.stat-row {
  display: flex;
  gap: 32px;
  margin-top: 32px;
  flex-wrap: wrap;
}

.stat-item {
  text-align: center;
}

.stat-num {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--navy);
  font-family: 'Playfair Display', serif;
}

.stat-desc {
  font-size: .82rem;
  color: var(--gray-600);
  text-transform: uppercase;
  letter-spacing: .08em;
  margin-top: 4px;
}

/* ---------- Scroll animations ---------- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity .6s ease, transform .6s ease;
}

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

/* ---------- Back to Top / Active nav ---------- */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  background: var(--navy);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  box-shadow: var(--shadow-md);
  cursor: pointer;
  opacity: 0;
  transition: opacity var(--transition), transform var(--transition);
  border: none;
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
}

.back-to-top:hover {
  background: var(--green);
  transform: translateY(-3px);
}