:root {
  --bg: #000000;
  --ink: #eaf6ff;
  --muted: #91b7d6;
  --surface: #0a1220;
  --line: #1d3550;
  --brand: #2aaeff;
  --brand-strong: #1865d8;
  --accent: #25ddd3;
  --warm: #ff9f00;
  --magenta: #e4007f;
  --yellow: #fff000;
  --green: #2eff00;
  --shadow: 0 20px 40px rgba(0, 0, 0, 0.45);
  --radius: 18px;
  --shell: min(1120px, 92vw);
  --font-title: "Cascadia Code", "Cascadia Mono", "Segoe UI Mono", Consolas, monospace;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-title);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.55;
}

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

a {
  color: var(--brand);
}

a:hover {
  color: var(--brand-strong);
}

.skip-link {
  position: absolute;
  top: -40px;
  left: 12px;
  background: var(--brand);
  color: #fff;
  padding: 8px 12px;
  border-radius: 8px;
  z-index: 1000;
}

.skip-link:focus {
  top: 12px;
}

.shell {
  width: var(--shell);
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  border-bottom: 1px solid rgba(37, 221, 211, 0.22);
  backdrop-filter: blur(8px);
  background: rgba(2, 4, 10, 0.88);
}

.nav-wrap {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  text-decoration: none;
  color: var(--ink);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 34px;
  aspect-ratio: 1;
  border-radius: 9px;
  color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--accent));
  font-weight: 700;
}

.brand-text {
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 1.05rem;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 18px;
}

.site-nav a {
  text-decoration: none;
  font-weight: 600;
}

.site-nav a[aria-current="page"] {
  color: var(--brand-strong);
}

.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  border-radius: 10px;
  padding: 8px 10px;
  font-weight: 700;
}

.hero {
  position: relative;
  overflow: clip;
  padding: 74px 0 62px;
}

.hero-bg {
  position: absolute;
  inset: -30% -20% auto;
  height: 430px;
  background: none;
  pointer-events: none;
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 34px;
  align-items: center;
}

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  color: var(--brand-strong);
  text-transform: uppercase;
  font-size: 0.82rem;
  letter-spacing: 0.09em;
  font-weight: 700;
  font-family: var(--font-title);
}

.kicker::before {
  content: "";
  width: 26px;
  height: 2px;
  background: linear-gradient(90deg, var(--brand), var(--accent));
}

h1,
h2,
h3 {
  font-family: var(--font-title);
  line-height: 1.08;
  margin: 0 0 0.55em;
}

h1 {
  font-size: clamp(2.15rem, 5.2vw, 4.2rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.5rem, 3.2vw, 2.3rem);
}

h3 {
  font-size: 1.14rem;
}

p {
  margin-top: 0;
}

.lead {
  font-size: 1.12rem;
  color: var(--muted);
  max-width: 56ch;
}

.lead.compact {
  max-width: 72ch;
  margin-bottom: 22px;
}

.subtle {
  color: var(--muted);
  font-size: 0.94rem;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 24px 0 10px;
}

.hero-image-card {
  margin: 0;
  border-radius: calc(var(--radius) + 2px);
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid rgba(220, 226, 255, 0.9);
  transform: rotate(0.5deg);
}

.btn {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 999px;
  padding: 11px 18px;
  border: 1px solid transparent;
  font-weight: 700;
  transition: transform 120ms ease, box-shadow 160ms ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:focus-visible,
.nav-toggle:focus-visible,
.filter-btn:focus-visible {
  outline: 3px solid rgba(8, 178, 184, 0.4);
  outline-offset: 2px;
}

.btn-primary {
  color: #070c17;
  background: var(--brand);
  box-shadow: 0 10px 24px rgba(42, 174, 255, 0.3);
}

.btn-primary:hover {
  background: var(--brand-strong);
}

.btn-ghost {
  background: var(--surface);
  border-color: var(--line);
  color: var(--ink);
}

.btn-quiet {
  background: var(--surface);
  border-color: var(--line);
  padding-inline: 14px;
}

.section {
  padding: 64px 0;
}

.section-soft {
  padding: 38px 0;
}

.two-col {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 28px;
  align-items: start;
}

.check-list {
  list-style: none;
  margin: 0;
  padding: 22px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.check-list li {
  position: relative;
  padding-left: 26px;
  margin: 0 0 12px;
  color: var(--muted);
}

.check-list li::before {
  content: "";
  position: absolute;
  top: 0.55em;
  left: 0;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--yellow), var(--warm), var(--magenta));
}

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

.feature-card {
  padding: 20px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.feature-card p {
  margin: 0;
  color: var(--muted);
}

.section-band {
  padding: 32px 0;
}

.band-layout {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 22px;
  border-radius: var(--radius);
  color: #f6feff;
  background: linear-gradient(120deg, #0f2a80 0%, #166ec5 44%, #1fb7d2 70%, #2ca15f 100%);
}

.band-text {
  margin: 0;
  max-width: 52ch;
  font-weight: 600;
}

.speaker-list {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 10px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.speaker-list li {
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: 12px;
  padding: 14px 12px;
  text-align: center;
  font-weight: 600;
}

.page-title {
  font-family: var(--font-title);
  margin-top: 8px;
  margin-bottom: 14px;
}

.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 20px;
}

.filter-btn {
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  padding: 8px 12px;
  border-radius: 999px;
  font-weight: 700;
  cursor: pointer;
}

.filter-btn.is-active {
  color: #070c17;
  border-color: transparent;
  background: linear-gradient(125deg, var(--yellow), var(--warm), var(--magenta));
}

.agenda {
  display: grid;
  gap: 14px;
}

.session-card {
  display: grid;
  grid-template-columns: 170px 1fr;
  gap: 14px;
  align-items: start;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
}

.session-time {
  font-family: var(--font-title);
  font-weight: 700;
  color: var(--brand-strong);
}

.tag {
  margin: 0 0 6px;
  display: inline-block;
  border-radius: 999px;
  background: #112a4e;
  color: #6ec5ff;
  padding: 4px 10px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.session-main h2 {
  font-size: 1.2rem;
  margin-bottom: 8px;
}

.session-main p {
  margin-bottom: 0;
  color: var(--muted);
}

.lab-steps {
  margin: 10px 0 0;
  padding-left: 20px;
  color: var(--muted);
}

.lab-steps li {
  margin-bottom: 8px;
}

.session-links {
  margin-top: 14px;
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.mini-band {
  margin-top: 24px;
  margin-bottom: 8px;
}

.site-footer {
  border-top: 1px solid var(--line);
  margin-top: 40px;
  background: rgba(4, 9, 18, 0.9);
}

.footer-layout {
  min-height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.footer-layout p {
  margin: 0;
  color: var(--muted);
  font-weight: 600;
}

.footer-links {
  display: flex;
  gap: 14px;
  align-items: center;
}

.footer-links a {
  text-decoration: none;
  font-weight: 700;
}

[hidden] {
  display: none !important;
}

@media (max-width: 960px) {
  .hero-grid,
  .two-col,
  .speaker-list {
    grid-template-columns: 1fr;
  }

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

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

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

@media (max-width: 760px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    top: 72px;
    right: 4vw;
    left: 4vw;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 12px;
    border-radius: 14px;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
    background: var(--surface);
  }

  .site-nav a {
    padding: 8px 4px;
  }

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

  .band-layout,
  .footer-layout {
    flex-direction: column;
    align-items: flex-start;
  }
}