:root {
  --bg: #f6f7fb;
  --panel: #ffffff;
  --text: #0c1222;
  --muted: #4b5568;
  --border: rgba(12, 18, 34, 0.12);
  --shadow: 0 16px 50px rgba(12, 18, 34, 0.08);
  --accent: #1b5cff;
  --accent2: #00b894;
  --warning: #cc5f00;
  --radius: 16px;
  --radius-sm: 12px;
  --container: 1100px;
  --serif: "DM Serif Display", ui-serif, Georgia, serif;
  --sans: "IBM Plex Sans", ui-sans-serif, system-ui, -apple-system, Segoe UI, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background: radial-gradient(1200px 700px at 15% 0%, rgba(27, 92, 255, 0.10), transparent 60%),
    radial-gradient(1200px 700px at 85% 10%, rgba(0, 184, 148, 0.10), transparent 62%),
    var(--bg);
  font-family: var(--sans);
  line-height: 1.5;
}

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

.container {
  max-width: var(--container);
  padding: 0 20px;
  margin: 0 auto;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 10px;
  background: var(--panel);
  border: 1px solid var(--border);
  padding: 10px 12px;
  border-radius: 10px;
  z-index: 1000;
}
.skip-link:focus {
  left: 12px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: rgba(246, 247, 251, 0.72);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(12, 18, 34, 0.08);
}

.header-inner {
  display: flex;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
}
.brand-mark {
  width: 14px;
  height: 14px;
  border-radius: 5px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  box-shadow: 0 10px 26px rgba(27, 92, 255, 0.25);
}
.brand-text {
  letter-spacing: 0.2px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-toggle {
  display: none;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.6);
  border-radius: 999px;
  padding: 8px 12px;
  font-weight: 600;
  cursor: pointer;
}

.nav-links {
  display: flex;
  gap: 18px;
  align-items: center;
  font-weight: 500;
  color: rgba(12, 18, 34, 0.86);
}
.nav-links a {
  padding: 8px 10px;
  border-radius: 999px;
}
.nav-links a:hover {
  background: rgba(12, 18, 34, 0.06);
}

.hero {
  padding: 52px 0 18px;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.5fr 0.9fr;
  gap: 22px;
  align-items: stretch;
}

.hero-eyebrow {
  margin: 0 0 10px;
  color: var(--muted);
  font-weight: 600;
}

.hero-title {
  font-family: var(--serif);
  font-size: clamp(34px, 4.2vw, 54px);
  line-height: 1.04;
  margin: 0 0 14px;
  letter-spacing: -0.4px;
}

.hero-lede {
  margin: 0 0 18px;
  color: rgba(12, 18, 34, 0.82);
  max-width: 64ch;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 12px 0 16px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.66);
  font-weight: 600;
}
.button:hover {
  background: rgba(255, 255, 255, 0.92);
}
.button.primary {
  background: linear-gradient(135deg, rgba(27, 92, 255, 1), rgba(0, 184, 148, 1));
  color: #fff;
  border: none;
  box-shadow: 0 18px 55px rgba(27, 92, 255, 0.22);
}
.button.primary:hover {
  filter: brightness(1.03);
}

.hero-meta {
  list-style: none;
  padding: 0;
  margin: 10px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(12, 18, 34, 0.10);
  color: rgba(12, 18, 34, 0.86);
  font-weight: 600;
  font-size: 13px;
}
.pill .dot {
  width: 8px;
  height: 8px;
  border-radius: 3px;
  background: var(--accent);
}
.pill.tbd .dot {
  background: var(--warning);
}

.hero-card {
  border-radius: var(--radius);
  border: 1px solid rgba(12, 18, 34, 0.10);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.86), rgba(255, 255, 255, 0.70));
  box-shadow: var(--shadow);
  overflow: hidden;
  position: relative;
}
.hero-card::before {
  content: "";
  position: absolute;
  inset: -140px -60px auto auto;
  width: 260px;
  height: 260px;
  background: radial-gradient(circle at 30% 30%, rgba(27, 92, 255, 0.22), transparent 60%);
  transform: rotate(8deg);
}
.hero-card-inner {
  position: relative;
  padding: 16px 16px 14px;
}
.card-title {
  margin: 0 0 10px;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.9px;
  color: rgba(12, 18, 34, 0.72);
}

.quick-links {
  display: grid;
  gap: 10px;
}

.quick-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 12px 12px;
  border-radius: 14px;
  border: 1px solid rgba(12, 18, 34, 0.10);
  background: rgba(255, 255, 255, 0.72);
}
.quick-link strong {
  font-size: 14px;
}
.quick-link span {
  color: var(--muted);
  font-weight: 600;
  font-size: 12px;
}
.quick-link:hover {
  background: rgba(255, 255, 255, 0.92);
}
.quick-link.tbd span {
  color: var(--warning);
}

.hero-card {
  align-self: start;
}

.section {
  padding: 34px 0;
}

.section-head {
  display: grid;
  gap: 6px;
  margin-bottom: 14px;
}
.section-head h2 {
  margin: 0;
  font-size: 22px;
  letter-spacing: -0.2px;
}
.section-subtitle {
  margin: 0;
  color: rgba(12, 18, 34, 0.68);
}

.box {
  background: var(--panel);
  border: 1px solid rgba(12, 18, 34, 0.10);
  border-radius: var(--radius);
  box-shadow: 0 14px 50px rgba(12, 18, 34, 0.06);
  padding: 16px;
}
.box-wide {
  padding: 18px;
}

.prose p {
  margin: 0 0 12px;
  color: rgba(12, 18, 34, 0.82);
}
.prose p:last-child {
  margin-bottom: 0;
}

.grid {
  display: grid;
  gap: 14px;
}
.presenters-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  grid-auto-rows: 1fr;
}
.callouts-grid {
  grid-template-columns: 1fr;
}
.schedule-grid {
  grid-template-columns: 1fr;
}
.reading-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.materials-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.presenter-card {
  display: grid;
  grid-template-columns: 68px 1fr;
  gap: 12px;
  align-items: center;
  height: 100%;
  min-height: 118px;
}

.presenter-link {
  display: block;
}
.presenter-link-card {
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
  will-change: transform;
}
.presenter-link:hover .presenter-link-card {
  transform: translateY(-4px);
  border-color: rgba(27, 92, 255, 0.26);
  box-shadow: 0 22px 70px rgba(12, 18, 34, 0.10);
}

.avatar {
  width: 68px;
  height: 68px;
  border-radius: 10px; /* square, not circle */
  border: 1px solid rgba(12, 18, 34, 0.14);
  object-fit: cover;
  background: rgba(12, 18, 34, 0.05);
}

.presenter-name {
  margin: 0;
  font-weight: 700;
  letter-spacing: -0.1px;
  line-height: 1.15;
}
.presenter-affil {
  margin: 4px 0 0;
  color: rgba(12, 18, 34, 0.70);
  font-weight: 600;
  font-size: 13px;
}
.presenter-email {
  margin: 8px 0 0;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 13px;
  color: rgba(27, 92, 255, 0.92);
}
.presenter-email:hover {
  text-decoration: underline;
}

.callout-title {
  margin: 0 0 10px;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.7px;
  color: rgba(12, 18, 34, 0.72);
}

/* Audience stacked banners (reference-like, non-clickable but hoverable) */
.audience-stacks {
  display: grid;
  gap: 18px;
  margin-top: 14px;
}
.stack-title {
  margin: 0 0 10px;
  font-size: 16px;
  letter-spacing: -0.1px;
}
.banner-list {
  display: grid;
  gap: 12px;
}
.banner-item {
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: 12px;
  align-items: center;
  padding: 14px 14px;
  border-radius: 16px;
  border: 1px solid rgba(12, 18, 34, 0.10);
  background: rgba(255, 255, 255, 0.78);
  box-shadow: 0 12px 40px rgba(12, 18, 34, 0.06);
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
  will-change: transform;
}
.banner-item:hover {
  transform: translateY(-4px);
  border-color: rgba(27, 92, 255, 0.22);
  box-shadow: 0 20px 62px rgba(12, 18, 34, 0.10);
}
.banner-icon {
  width: 36px;
  height: 36px;
  border-radius: 12px;
  border: 1px solid rgba(12, 18, 34, 0.10);
  background: rgba(12, 18, 34, 0.03);
  position: relative;
}
.banner-icon::after {
  content: "";
  position: absolute;
  inset: 8px;
  background: rgba(12, 18, 34, 0.55);
  -webkit-mask-repeat: no-repeat;
  -webkit-mask-position: center;
  -webkit-mask-size: contain;
  mask-repeat: no-repeat;
  mask-position: center;
  mask-size: contain;
}
.banner-icon.people::after {
  -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='black' d='M16 11c1.66 0 3-1.57 3-3.5S17.66 4 16 4s-3 1.57-3 3.5S14.34 11 16 11ZM8 11c1.66 0 3-1.57 3-3.5S9.66 4 8 4 5 5.57 5 7.5 6.34 11 8 11Zm0 2c-2.33 0-7 1.17-7 3.5V19h14v-2.5C15 14.17 10.33 13 8 13Zm8 0c-.29 0-.62.02-.97.05 1.16.84 1.97 1.91 1.97 3.45V19h7v-2.5C24 14.17 18.33 13 16 13Z'/%3E%3C/svg%3E");
  mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='black' d='M16 11c1.66 0 3-1.57 3-3.5S17.66 4 16 4s-3 1.57-3 3.5S14.34 11 16 11ZM8 11c1.66 0 3-1.57 3-3.5S9.66 4 8 4 5 5.57 5 7.5 6.34 11 8 11Zm0 2c-2.33 0-7 1.17-7 3.5V19h14v-2.5C15 14.17 10.33 13 8 13Zm8 0c-.29 0-.62.02-.97.05 1.16.84 1.97 1.91 1.97 3.45V19h7v-2.5C24 14.17 18.33 13 16 13Z'/%3E%3C/svg%3E");
}
.banner-icon.check::after {
  background: rgba(0, 128, 96, 0.65);
  -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='black' d='M9 16.17 4.83 12 3.41 13.41 9 19l12-12-1.41-1.41z'/%3E%3C/svg%3E");
  mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='black' d='M9 16.17 4.83 12 3.41 13.41 9 19l12-12-1.41-1.41z'/%3E%3C/svg%3E");
}
.banner-icon.spark::after {
  -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='black' d='M9 21 10 14 3 12l7-2 1-7 2 7 7 2-7 2 1 7z'/%3E%3C/svg%3E");
  mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='black' d='M9 21 10 14 3 12l7-2 1-7 2 7 7 2-7 2 1 7z'/%3E%3C/svg%3E");
}
.banner-icon.people {
  background: rgba(27, 92, 255, 0.08);
}
.banner-icon.check {
  background: rgba(0, 184, 148, 0.10);
}
.banner-icon.spark {
  background: rgba(27, 92, 255, 0.06);
}
.banner-text {
  font-weight: 650;
  color: rgba(12, 18, 34, 0.84);
}

.paper-scroll {
  max-height: 260px;
  overflow: auto;
  padding-right: 2px;
}
.paper-scroll::-webkit-scrollbar {
  width: 10px;
}
.paper-scroll::-webkit-scrollbar-track {
  background: rgba(12, 18, 34, 0.04);
  border-radius: 999px;
}
.paper-scroll::-webkit-scrollbar-thumb {
  background: rgba(12, 18, 34, 0.16);
  border-radius: 999px;
  border: 2px solid rgba(255, 255, 255, 0.65);
}
.banner-text {
  font-weight: 650;
  color: rgba(12, 18, 34, 0.84);
}

/* About section: info panel like reference */
.about-box {
  display: grid;
  gap: 14px;
}
.about-info {
  border-left: 3px solid rgba(0, 128, 96, 0.55);
  padding: 10px 12px;
  border-radius: 12px;
  background: rgba(12, 18, 34, 0.02);
}
.about-row {
  display: grid;
  grid-template-columns: 84px 1fr;
  gap: 10px;
  padding: 6px 0;
}
.about-label {
  font-weight: 800;
  color: rgba(12, 18, 34, 0.72);
}
.about-value {
  font-weight: 750;
  color: rgba(12, 18, 34, 0.84);
}

/* Audience callouts: “clickable” hover lift (not links) */
.callout-box {
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
  will-change: transform;
}
.callout-box:hover {
  transform: translateY(-4px);
  border-color: rgba(27, 92, 255, 0.26);
  box-shadow: 0 22px 70px rgba(12, 18, 34, 0.10);
}
.callout-box:active {
  transform: translateY(-2px);
}
.bullets {
  padding-left: 18px;
  margin: 0;
  color: rgba(12, 18, 34, 0.82);
}
.bullets li {
  margin: 8px 0;
}

.agenda-card {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 14px;
  align-items: start;
}
.minute-badge {
  width: 56px;
  min-height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  border: 1px solid rgba(12, 18, 34, 0.10);
  background: rgba(27, 92, 255, 0.08);
  color: rgba(27, 92, 255, 0.95);
  font-weight: 900;
  font-size: 12px;
  letter-spacing: 0.2px;
}
.agenda-main {
  display: grid;
  gap: 10px;
}
.agenda-top {
  display: flex;
  gap: 10px;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
}
.agenda-title {
  margin: 0;
  font-size: 17px;
  letter-spacing: -0.2px;
}
.agenda-subtitle {
  margin: 4px 0 0;
  color: rgba(12, 18, 34, 0.66);
  font-weight: 700;
  font-size: 13px;
}
.agenda-body {
  margin: 0;
  padding-left: 18px;
  color: rgba(12, 18, 34, 0.82);
}
.agenda-body li {
  margin: 8px 0;
}

.agenda-papers {
  display: grid;
  gap: 8px;
}
.agenda-papers-title {
  margin: 4px 0 0;
  color: rgba(12, 18, 34, 0.72);
  font-weight: 800;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.7px;
}
.agenda-paper {
  padding: 10px 12px;
  border-radius: 14px;
  border: 1px solid rgba(12, 18, 34, 0.10);
  background: rgba(255, 255, 255, 0.72);
}
.agenda-paper-title {
  margin: 0;
  font-weight: 900;
  letter-spacing: -0.15px;
}
.agenda-paper-meta {
  margin: 6px 0 0;
  color: rgba(12, 18, 34, 0.68);
  font-weight: 600;
  font-size: 13px;
}
.agenda-paper-note {
  margin: 8px 0 0;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 900;
  font-size: 12px;
  color: rgba(0, 128, 96, 1);
}
.agenda-paper-note .star {
  width: 9px;
  height: 9px;
  border-radius: 3px;
  background: var(--accent2);
}

.reading-part-title {
  margin: 0 0 10px;
  font-size: 16px;
}

/* Make each reading-list part card a fixed-height scroll container */
.reading-part-card {
  display: flex;
  flex-direction: column;
  height: 340px;
}
.paper-scroll {
  flex: 1;
  min-height: 0;
}
.paper {
  padding: 10px 12px;
  border-radius: 14px;
  border: 1px solid rgba(12, 18, 34, 0.10);
  background: rgba(12, 18, 34, 0.02);
  margin: 10px 0 0;
}
.paper:first-of-type {
  margin-top: 0;
}
.paper-title {
  margin: 0;
  font-weight: 800;
  letter-spacing: -0.1px;
}
.paper-meta {
  margin: 6px 0 0;
  color: rgba(12, 18, 34, 0.72);
  font-weight: 600;
  font-size: 13px;
}
.paper-note {
  margin: 8px 0 0;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 800;
  font-size: 12px;
  color: rgba(0, 128, 96, 1);
}
.paper-note .star {
  width: 9px;
  height: 9px;
  border-radius: 3px;
  background: var(--accent2);
}

.material-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.material-card h3 {
  margin: 0;
  font-size: 16px;
}
.material-card p {
  margin: 0;
  color: rgba(12, 18, 34, 0.74);
}
.material-card a {
  font-weight: 800;
  color: rgba(27, 92, 255, 0.92);
}
.material-card a:hover {
  text-decoration: underline;
}
.material-card .tbd {
  font-weight: 800;
  color: var(--warning);
}

.site-footer {
  padding: 18px 0 28px;
  border-top: 1px solid rgba(12, 18, 34, 0.10);
  background: rgba(255, 255, 255, 0.52);
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.footer-note {
  margin: 0;
  color: rgba(12, 18, 34, 0.68);
  font-weight: 600;
}
.back-to-top {
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid rgba(12, 18, 34, 0.10);
  background: rgba(255, 255, 255, 0.68);
  font-weight: 700;
}
.back-to-top:hover {
  background: rgba(255, 255, 255, 0.92);
}

@media (max-width: 980px) {
  .hero-inner {
    grid-template-columns: 1fr;
  }
  .presenters-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .nav-toggle {
    display: inline-flex;
  }
  .nav-links {
    display: none;
    position: absolute;
    right: 20px;
    top: 56px;
    background: rgba(255, 255, 255, 0.95);
    border: 1px solid rgba(12, 18, 34, 0.10);
    border-radius: 16px;
    padding: 10px;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    box-shadow: var(--shadow);
    min-width: 220px;
  }
  .nav-links a {
    border-radius: 12px;
  }
  .nav-links.open {
    display: flex;
  }
  .callouts-grid,
  .schedule-grid,
  .reading-grid,
  .materials-grid {
    grid-template-columns: 1fr;
  }

  .agenda-card {
    grid-template-columns: 1fr;
  }
  .minute-badge {
    width: fit-content;
    padding: 6px 10px;
    border-radius: 999px;
    justify-self: start;
  }
}