:root {
  --bg: #0a0f1c;
  --panel: #111827;
  --card: #0f172a;
  --border: #1f2937;

  --text: #e5e7eb;
  --muted: #9ca3af;

  --accent-blue: #00d4ff;
  --accent-green: #00ff9c;

  --glow-blue: 0 0 8px #00d4ff;
  --glow-green: 0 0 8px #00ff9c;
  --container: 1040px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top, rgba(0, 212, 255, 0.08), transparent 28%),
    radial-gradient(circle at bottom right, rgba(0, 255, 156, 0.08), transparent 24%),
    var(--bg);
}

body.is-lightbox-open {
  overflow: hidden;
}

[hidden] {
  display: none !important;
}

a {
  color: var(--accent-blue);
  text-decoration: none;
}

a:hover {
  color: #8cefff;
}

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

.container {
  width: min(calc(100% - 2rem), var(--container));
  margin: 0 auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(10, 15, 28, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(31, 41, 55, 0.9);
}

.topbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 70px;
}

.brand {
  color: var(--text);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.brand:hover {
  color: var(--accent-blue);
  text-decoration: none;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border-radius: 12px;
  border: 1px solid rgba(0, 212, 255, 0.35);
  background: rgba(15, 23, 42, 0.92);
  color: var(--accent-blue);
  align-items: center;
  justify-content: center;
  gap: 0.28rem;
  flex-direction: column;
  cursor: pointer;
  transition: 0.2s ease;
}

.nav-toggle:hover {
  border-color: var(--accent-blue);
  box-shadow: var(--glow-blue);
}

.nav-toggle__bar {
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background: currentColor;
  transition: 0.2s ease;
}

.nav-toggle.is-open .nav-toggle__bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle.is-open .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle.is-open .nav-toggle__bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.site-nav__link {
  padding: 0.5rem 0.85rem;
  border-radius: 999px;
  color: var(--muted);
  transition: 0.2s ease;
}

.site-nav__link:hover {
  color: var(--text);
  box-shadow: var(--glow-blue);
}

.site-nav__link.is-active {
  color: var(--accent-blue);
  box-shadow: var(--glow-blue);
}

.page-hero {
  padding: 2.75rem 0 1.5rem;
}

.page-home .page-hero {
  min-height: calc(100vh - 70px - 58px);
  display: flex;
  align-items: center;
}

.page-home .page-shell {
  display: none;
}

.page-home #breadcrumbs-root,
.page-home .page-eyebrow {
  display: none;
}

.page-home .container {
  text-align: center;
}

.page-home #page-title {
  max-width: 14ch;
  margin: 0 auto;
}

.page-home .page-subtitle {
  max-width: 36rem;
  margin-left: auto;
  margin-right: auto;
}

.page-home .page-actions {
  justify-content: center;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.breadcrumbs:empty {
  display: none;
}

.breadcrumbs__separator {
  color: #4b5563;
}

.page-eyebrow {
  margin: 0 0 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.74rem;
  color: var(--accent-green);
}

#page-title {
  margin: 0;
  font-size: clamp(1.9rem, 4vw, 3rem);
  line-height: 1.08;
}

.page-subtitle {
  max-width: 54rem;
  margin: 0.9rem 0 0;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.6;
}

.page-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.page-shell {
  padding: 1.2rem 0 3rem;
}

.stack {
  display: grid;
  gap: 1rem;
}

.stack-lg {
  display: grid;
  gap: 1.5rem;
}

.grid {
  display: grid;
  gap: 1rem;
}

.grid--2 {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.grid--3 {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.section-card,
.card,
.empty-state,
.not-found {
  background: var(--panel);
  border: 1px solid rgba(31, 41, 55, 0.9);
  border-radius: 16px;
}

.section-card {
  padding: 1.15rem;
}

.section-title {
  margin: 0 0 0.6rem;
  font-size: 1rem;
  color: var(--text);
}

.section-text {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

.card {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  padding: 1rem;
  background: var(--card);
  border: 1px solid var(--border);
  transition: 0.2s ease;
}

.card:hover,
.section-card:hover {
  border-color: var(--accent-blue);
  box-shadow: var(--glow-blue);
}

.card__meta {
  margin: 0;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-green);
}

.card__title {
  margin: 0;
  font-size: 1.05rem;
  line-height: 1.35;
}

.card__text {
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
}

.card__footer {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  margin-top: auto;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.24rem 0.65rem;
  border-radius: 999px;
  border: 1px solid rgba(0, 255, 156, 0.28);
  color: var(--accent-green);
  font-size: 0.82rem;
}

.button,
.button-link {
  background: transparent;
  border: 1px solid var(--accent-blue);
  color: var(--accent-blue);
  padding: 6px 12px;
  border-radius: 6px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  width: fit-content;
  transition: 0.2s ease;
}

.button:hover,
.button-link:hover {
  background: var(--accent-blue);
  color: black;
  box-shadow: var(--glow-blue);
  text-decoration: none;
}

.detail-card {
  padding: 0;
}

.detail-card__meta {
  margin: 0;
  color: var(--accent-blue);
  font-size: 0.92rem;
  font-weight: 600;
}

.detail-card__summary {
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
}

.info-grid {
  display: grid;
  gap: 0.7rem;
}

.info-grid__row {
  padding: 0.8rem 0.95rem;
  border-radius: 12px;
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid rgba(31, 41, 55, 0.75);
}

.info-grid__label {
  display: block;
  margin-bottom: 0.2rem;
  color: var(--accent-green);
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.info-grid__value {
  color: var(--text);
  line-height: 1.45;
  word-break: break-word;
}

.resource-list,
.plain-list {
  margin: 0;
  padding-left: 1.1rem;
}

.resource-list li + li,
.plain-list li + li {
  margin-top: 0.5rem;
}

.materials-section {
  gap: 0.4rem;
  padding: 0.75rem;
}

.materials-section > .section-title {
  margin-bottom: 0.1rem;
}

.materials-section .section-card {
  padding: 0.6rem 0.75rem;
  border-radius: 10px;
}

.materials-section .section-title {
  margin-bottom: 0.22rem;
  font-size: 0.92rem;
}

.materials-section .resource-list,
.materials-section .plain-list {
  padding-left: 0.95rem;
  line-height: 1.32;
}

.materials-section .resource-list li + li,
.materials-section .plain-list li + li {
  margin-top: 0.12rem;
}

.materials-section .section-text {
  line-height: 1.35;
}

.resource-note {
  color: var(--muted);
}

.speaker-card {
  display: grid;
  gap: 0.9rem;
  align-items: center;
  grid-template-columns: 72px 1fr;
  padding: 0.9rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
}

.speaker-profile {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: minmax(180px, 220px) 1fr;
}

.speaker-card__photo,
.speaker-profile__photo {
  display: flex;
  align-items: center;
  justify-content: center;
}

.speaker-profile__photo {
  align-items: flex-start;
}

.speaker-photo-trigger {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
}

.speaker-photo-trigger__hint {
  position: absolute;
  bottom: -0.2rem;
  right: -0.2rem;
  padding: 0.22rem 0.5rem;
  border-radius: 999px;
  background: rgba(10, 15, 28, 0.88);
  border: 1px solid rgba(0, 212, 255, 0.4);
  color: var(--accent-blue);
  font-size: 0.72rem;
  box-shadow: var(--glow-blue);
  opacity: 0;
  transform: translateY(4px);
  transition: 0.2s ease;
  pointer-events: none;
}

.speaker-photo-trigger:hover .speaker-photo-trigger__hint,
.speaker-photo-trigger:focus-visible .speaker-photo-trigger__hint {
  opacity: 1;
  transform: translateY(0);
}

.speaker-photo-trigger:focus-visible {
  outline: 2px solid var(--accent-blue);
  outline-offset: 6px;
  border-radius: 20px;
}

.speaker-photo {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  border: 2px solid var(--accent-green);
  box-shadow: var(--glow-green);
  object-fit: cover;
}

.speaker-profile__photo .speaker-photo {
  width: 180px;
  height: 180px;
  border-radius: 20px;
}

.contact-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.photo-gallery {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(190px, 220px));
}

.photo-gallery__item {
  display: block;
  overflow: hidden;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--card);
  transition: 0.2s ease;
}

.photo-gallery__item:hover {
  border-color: var(--accent-green);
  box-shadow: var(--glow-green);
}

.photo-gallery__thumb {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: rgba(15, 23, 42, 0.92);
}

.photo-gallery__item img {
  width: 100%;
  height: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.photo-gallery__item:hover img {
  transform: scale(1.04);
  opacity: 0.82;
}

.photo-gallery__hint {
  position: absolute;
  right: 0.7rem;
  bottom: 0.7rem;
  padding: 0.28rem 0.55rem;
  border-radius: 999px;
  background: rgba(10, 15, 28, 0.82);
  border: 1px solid rgba(0, 212, 255, 0.4);
  color: var(--accent-blue);
  font-size: 0.78rem;
  box-shadow: var(--glow-blue);
}

.photo-gallery__caption {
  padding: 0.75rem 0.85rem 0.9rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.photo-lightbox {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: grid;
  place-items: center;
  padding: 1.5rem;
  background: rgba(4, 7, 16, 0.86);
  backdrop-filter: blur(8px);
}

.photo-lightbox__surface {
  position: relative;
  width: min(100%, 1100px);
  max-height: calc(100vh - 3rem);
  padding: 1rem;
  border-radius: 20px;
  border: 1px solid rgba(0, 212, 255, 0.22);
  background: rgba(10, 15, 28, 0.96);
  box-shadow: 0 24px 90px rgba(0, 0, 0, 0.45);
}

.photo-lightbox__image {
  width: 100%;
  max-height: calc(100vh - 9rem);
  object-fit: contain;
  border-radius: 14px;
}

.photo-lightbox__caption {
  margin: 0.85rem 0 0;
  color: var(--muted);
  text-align: center;
  line-height: 1.5;
}

.photo-lightbox__close {
  position: absolute;
  top: 0.7rem;
  right: 0.7rem;
  background: rgba(15, 23, 42, 0.95);
  border: 1px solid rgba(0, 212, 255, 0.35);
  color: var(--accent-blue);
  border-radius: 999px;
  padding: 0.45rem 0.8rem;
  cursor: pointer;
  transition: 0.2s ease;
}

.photo-lightbox__close:hover {
  box-shadow: var(--glow-blue);
}

.empty-state,
.not-found {
  padding: 1.4rem;
  color: var(--muted);
  text-align: center;
}

.home-spacer {
  min-height: 1px;
}

.site-footer {
  border-top: 1px solid rgba(31, 41, 55, 0.9);
  background: rgba(10, 15, 28, 0.92);
}

.site-footer__inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 1rem 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.site-footer__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  margin: 0;
}

.site-version-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.22rem 0.55rem;
  border-radius: 999px;
  border: 1px solid rgba(0, 212, 255, 0.45);
  color: var(--accent-blue);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  box-shadow: var(--glow-blue);
}

@media (max-width: 760px) {
  .topbar__inner {
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    padding: 0.9rem 0;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    display: none;
    width: 100%;
    flex-direction: column;
    gap: 0.55rem;
    padding-top: 0.35rem;
  }

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

  .site-nav__link {
    width: 100%;
    border-radius: 12px;
    padding: 0.75rem 0.95rem;
    background: rgba(15, 23, 42, 0.92);
    border: 1px solid rgba(31, 41, 55, 0.85);
  }

  .page-hero {
    padding-top: 2.2rem;
  }

  .speaker-card {
    grid-template-columns: 1fr;
    justify-items: start;
  }

  .speaker-profile {
    grid-template-columns: 1fr;
  }

  .speaker-profile__photo .speaker-photo {
    width: 132px;
    height: 132px;
  }
}