:root {
  --background: #07111f;
  --background-alt: #0b1b2f;
  --surface: #102640;
  --surface-alt: #16304e;
  --text: #f7fbff;
  --muted: #a8bdd2;
  --accent: #48d7ff;
  --accent-alt: #8bf0c5;
  --accent-contrast: #07111f;
  --font-family: Inter, system-ui, sans-serif;
  --border: color-mix(in srgb, var(--text) 14%, transparent);
  --shadow: 0 22px 60px rgb(0 0 0 / 35%);
  --radius: 18px;
  --max-width: 1220px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 12% 0%, color-mix(in srgb, var(--accent) 15%, transparent), transparent 28rem),
    radial-gradient(circle at 88% 12%, color-mix(in srgb, var(--accent-alt) 12%, transparent), transparent 26rem),
    linear-gradient(180deg, var(--background), var(--background-alt));
  color: var(--text);
  font-family: var(--font-family);
  line-height: 1.6;
}

button,
input {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  min-height: 72px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 12px max(20px, calc((100vw - var(--max-width)) / 2));
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--background) 88%, transparent);
  backdrop-filter: blur(16px);
}

.brand {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 14px;
  color: var(--text);
  text-decoration: none;
}

.brand-logo {
  display: none;
  width: auto;
  max-width: 190px;
  height: 42px;
  object-fit: contain;
}

.brand-divider {
  width: 1px;
  height: 28px;
  background: var(--border);
}

.brand-label {
  overflow: hidden;
  color: var(--accent-alt);
  font-size: .8rem;
  font-weight: 800;
  letter-spacing: .12em;
  text-overflow: ellipsis;
  text-transform: uppercase;
  white-space: nowrap;
}

.event-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.event-nav a {
  padding: 8px 12px;
  border-radius: 999px;
  color: var(--muted);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .05em;
  text-decoration: none;
  text-transform: uppercase;
}

.event-nav a:hover,
.event-nav a:focus-visible {
  background: color-mix(in srgb, var(--text) 7%, transparent);
  color: var(--text);
}

.event-nav .nav-cta {
  background: var(--accent);
  color: var(--accent-contrast);
}

.hero,
.content-section {
  width: min(var(--max-width), calc(100% - 40px));
  margin-inline: auto;
}

.hero {
  display: grid;
  min-height: 470px;
  place-content: center;
  padding-block: 80px;
  text-align: center;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent-alt);
  font-size: .78rem;
  font-weight: 800;
  letter-spacing: .18em;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  max-width: 980px;
  margin-bottom: 12px;
  font-size: clamp(3.2rem, 9vw, 7rem);
  font-weight: 900;
  letter-spacing: -.07em;
  line-height: .88;
  text-transform: uppercase;
}

h1 em {
  color: var(--accent);
  font-style: normal;
}

h2 {
  margin-bottom: 8px;
  font-size: clamp(2rem, 4vw, 3.5rem);
  letter-spacing: -.04em;
  line-height: 1.05;
}

.tagline {
  margin-bottom: 8px;
  color: var(--accent-alt);
  font-size: clamp(1.15rem, 2.5vw, 1.6rem);
  font-weight: 700;
}

.hero-copy,
.section-copy {
  max-width: 760px;
  color: var(--muted);
  font-size: 1.05rem;
}

.hero-copy {
  margin: 0 auto 26px;
}

.button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border: 1px solid transparent;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 800;
  text-decoration: none;
}

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

.button-secondary {
  border-color: var(--border);
  background: color-mix(in srgb, var(--text) 5%, transparent);
  color: var(--text);
}

.content-section {
  padding-block: 64px 100px;
  border-top: 1px solid var(--border);
}

.filter-bar,
.tools,
.view-toggle,
.dialog-actions,
.calendar-links {
  display: flex;
  align-items: center;
  gap: 10px;
}

.filter-bar {
  flex-wrap: wrap;
  margin-block: 32px 16px;
}

.filter-button,
.view-button {
  padding: 9px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-weight: 700;
}

.filter-button.is-active,
.view-button.is-active {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  color: var(--text);
}

.tools {
  justify-content: space-between;
  margin-bottom: 32px;
}

.search {
  width: min(100%, 480px);
}

.search input,
.field input {
  width: 100%;
  padding: 12px 15px;
  border: 1px solid var(--border);
  border-radius: 12px;
  outline: none;
  background: color-mix(in srgb, var(--surface) 82%, transparent);
  color: var(--text);
}

.search input:focus,
.field input:focus {
  border-color: var(--accent);
}

.day-group + .day-group {
  margin-top: 56px;
}

.day-heading {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 18px;
  font-size: 1.25rem;
}

.day-heading::after {
  width: 100%;
  height: 1px;
  background: var(--border);
  content: "";
}

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

.session-grid.is-list {
  grid-template-columns: 1fr;
}

.session-card {
  display: flex;
  min-width: 0;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: linear-gradient(145deg, var(--surface), var(--surface-alt));
  box-shadow: 0 12px 30px rgb(0 0 0 / 14%);
  cursor: pointer;
}

.session-card:hover,
.session-card:focus-visible {
  border-color: color-mix(in srgb, var(--accent) 55%, var(--border));
  transform: translateY(-2px);
}

.session-card-main {
  display: grid;
  grid-template-columns: 92px 1fr;
  gap: 16px;
  padding: 20px;
}

.avatar {
  position: relative;
  width: 92px;
  height: 92px;
  overflow: hidden;
  border-radius: 14px;
  background: color-mix(in srgb, var(--accent) 18%, var(--background));
}

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

.avatar-fallback {
  display: grid;
  width: 100%;
  height: 100%;
  place-items: center;
  color: var(--accent);
  font-size: 1.6rem;
  font-weight: 900;
}

.session-time {
  margin-bottom: 4px;
  color: var(--accent-alt);
  font-size: .78rem;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.session-title {
  margin-bottom: 5px;
  font-size: 1.15rem;
  font-weight: 800;
  line-height: 1.2;
}

.session-mentor,
.session-description {
  margin-bottom: 0;
  color: var(--muted);
}

.session-description {
  display: -webkit-box;
  padding: 0 20px 20px;
  overflow: hidden;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
}

.session-card-footer {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: auto;
  padding: 12px 20px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: .78rem;
  font-weight: 700;
}

.status {
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--muted);
  background: var(--surface);
}

.status-error {
  border-color: #ef7777;
  color: #ffd0d0;
}

.site-footer {
  padding: 48px 20px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  text-align: center;
}

.site-footer p {
  margin-bottom: 4px;
}

.site-footer a {
  color: var(--accent);
}

.footer-logo {
  display: none;
  max-width: 180px;
  max-height: 58px;
  margin: 0 auto 18px;
}

.dialog {
  width: min(620px, calc(100% - 32px));
  max-height: calc(100vh - 32px);
  padding: 32px;
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: 22px;
  background: var(--background-alt);
  color: var(--text);
  box-shadow: var(--shadow);
}

.dialog-wide {
  width: min(920px, calc(100% - 32px));
}

.dialog-small {
  width: min(420px, calc(100% - 32px));
}

.dialog::backdrop {
  background: rgb(0 0 0 / 72%);
  backdrop-filter: blur(5px);
}

.dialog-close {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 38px;
  height: 38px;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  font-size: 1.5rem;
}

.session-detail {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  gap: 30px;
}

.detail-mentor {
  color: var(--accent-alt);
  font-size: 1.1rem;
  font-weight: 700;
}

.detail-block {
  margin-top: 22px;
}

.detail-block h3 {
  margin-bottom: 5px;
  color: var(--accent-alt);
  font-size: .76rem;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.detail-block p {
  color: var(--muted);
  white-space: pre-line;
}

.detail-photo {
  width: 100%;
  border-radius: 18px;
}

.dialog-actions {
  flex-wrap: wrap;
  margin-top: 28px;
}

.calendar-links {
  align-items: stretch;
  flex-direction: column;
}

.field {
  display: grid;
  gap: 6px;
  margin-top: 16px;
  font-weight: 700;
}

.checkbox {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-top: 16px;
  color: var(--muted);
}

.checkbox input {
  margin-top: 5px;
}

fieldset {
  min-width: 0;
  margin: 22px 0;
  padding: 0;
  border: 0;
}

legend {
  margin-bottom: 8px;
  font-weight: 800;
}

.registration-sessions {
  display: grid;
  max-height: 280px;
  gap: 8px;
  padding: 10px;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
}

.registration-option {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px;
  padding: 8px;
  border-radius: 8px;
  cursor: pointer;
}

.registration-option:hover {
  background: var(--surface-alt);
}

.registration-option small {
  display: block;
  color: var(--muted);
}

.form-message {
  min-height: 1.5em;
  color: var(--accent-alt);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

[hidden] {
  display: none !important;
}

@media (max-width: 920px) {
  .event-nav a:not(.nav-cta) {
    display: none;
  }

  .session-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 680px) {
  .site-header {
    min-height: 64px;
  }

  .brand-divider,
  .brand-label {
    display: none;
  }

  .hero {
    min-height: 390px;
    padding-block: 56px;
  }

  .session-grid {
    grid-template-columns: 1fr;
  }

  .tools,
  .session-detail {
    display: grid;
    grid-template-columns: 1fr;
  }

  .view-toggle {
    display: none;
  }

  .detail-photo-wrap {
    grid-row: 1;
    max-width: 220px;
  }

  .dialog {
    padding: 28px 20px;
  }
}