:root {
  --font-display: "Cabinet Grotesk", "Inter", sans-serif;
  --font-body: "Satoshi", "Inter", sans-serif;

  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.2rem);
  --text-2xl: clamp(2.5rem, 1.6rem + 3vw, 4.8rem);

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  --bg: #090b12;
  --surface: rgba(16, 20, 34, 0.78);
  --surface-strong: rgba(19, 24, 42, 0.92);
  --border: rgba(255, 255, 255, 0.12);
  --border-strong: rgba(138, 124, 255, 0.26);
  --text: #f5f7ff;
  --muted: #a9b0cb;
  --faint: #7a8099;
  --primary: #78a6ff;
  --secondary: #9a7cff;
  --accent: linear-gradient(135deg, rgba(120,166,255,0.95), rgba(154,124,255,0.95));
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
  --radius-sm: 0.75rem;
  --radius-lg: 1.5rem;
  --radius-xl: 2rem;
  --content: 1180px;
  --header-height: 5rem;
  --transition: 220ms cubic-bezier(0.16, 1, 0.3, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 6rem; }

body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(114, 143, 255, 0.16), transparent 30%),
    radial-gradient(circle at 80% 20%, rgba(140, 104, 255, 0.18), transparent 26%),
    linear-gradient(180deg, #070910 0%, #090b12 45%, #0a0d17 100%);
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input { font: inherit; }
button { cursor: pointer; border: 0; }
input { border: 0; outline: none; }

.skip-link { position: absolute; left: -9999px; top: auto; }
.skip-link:focus {
  left: var(--space-4);
  top: var(--space-4);
  z-index: 1000;
  background: #fff;
  color: #000;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm);
}

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

.section {
  padding: clamp(var(--space-16), 10vw, var(--space-24)) 0;
  position: relative;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(18px);
  background: rgba(7, 10, 18, 0.72);
  border-bottom: 1px solid transparent;
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.site-header.scrolled {
  background: rgba(7, 10, 18, 0.88);
  border-color: var(--border);
  box-shadow: 0 10px 30px rgba(0,0,0,0.18);
}

.header-inner {
  min-height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.04em;
}

.brand-mark {
  width: 2.5rem;
  height: 2.5rem;
  display: grid;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 0.9rem;
  color: var(--primary);
  background: rgba(255,255,255,0.03);
}

.brand-text { color: var(--text); }

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

.nav-toggle {
  display: none;
  min-width: 44px;
  min-height: 44px;
  padding: 0 var(--space-4);
  border-radius: 999px;
  background: rgba(255,255,255,0.05);
  color: var(--text);
  border: 1px solid var(--border);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav-menu a {
  padding: 0.75rem 1rem;
  color: var(--muted);
  font-size: var(--text-sm);
  border-radius: 999px;
  transition: color var(--transition), background var(--transition), transform var(--transition);
}

.nav-menu a:hover { color: var(--text); background: rgba(255,255,255,0.05); }

.nav-cta {
  color: var(--text) !important;
  border: 1px solid rgba(120,166,255,0.24);
  background: rgba(120,166,255,0.12);
}

.hero {
  min-height: calc(100vh - var(--header-height));
  display: flex;
  align-items: center;
  overflow: clip;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(320px, 0.8fr);
  gap: var(--space-12);
  align-items: center;
}

.hero-glow {
  position: absolute;
  border-radius: 999px;
  filter: blur(80px);
  opacity: 0.45;
  pointer-events: none;
}

.hero-glow-1 {
  width: 22rem;
  height: 22rem;
  left: -6rem;
  top: 7rem;
  background: rgba(98, 139, 255, 0.24);
}

.hero-glow-2 {
  width: 18rem;
  height: 18rem;
  right: 8%;
  top: 9rem;
  background: rgba(147, 106, 255, 0.22);
}

.eyebrow {
  display: inline-flex;
  padding: 0.45rem 0.8rem;
  border: 1px solid rgba(120,166,255,0.22);
  border-radius: 999px;
  background: rgba(255,255,255,0.03);
  color: #c9d6ff;
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  margin-bottom: var(--space-6);
}

.hero h1,
.section-head h2,
.speaker-card h3,
.card h3,
.format-item h3 {
  font-family: var(--font-display);
}

.hero h1 {
  font-size: var(--text-2xl);
  line-height: 0.98;
  letter-spacing: -0.04em;
  max-width: 12ch;
}

.hero h1 span {
  background: linear-gradient(135deg, #ffffff 0%, #c8d8ff 42%, #bcaeff 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-text {
  margin-top: var(--space-6);
  max-width: 38rem;
  color: var(--muted);
}

.hero-actions {
  margin-top: var(--space-8);
  display: flex;
  align-items: center;
  gap: var(--space-5);
  flex-wrap: wrap;
}

.seats-note {
  color: var(--faint);
  font-size: var(--text-sm);
}

.button {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-height: 48px;
  padding: 0.9rem 1.35rem;
  border-radius: 999px;
  font-size: var(--text-sm);
  font-weight: 700;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), border-color var(--transition);
}

.button:hover { transform: translateY(-2px); }

.button-primary {
  color: #09101d;
  background: var(--accent);
  box-shadow: 0 12px 30px rgba(98, 130, 255, 0.28);
}

.button-primary:hover { box-shadow: 0 18px 38px rgba(98, 130, 255, 0.34); }

.button-secondary {
  color: var(--text);
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.03);
}

.button-wide { width: 100%; }

.hero-panel {
  position: relative;
  display: grid;
  gap: var(--space-4);
}

.panel-card {
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(255,255,255,0.05), rgba(255,255,255,0.025));
  box-shadow: var(--shadow);
}

.panel-accent {
  border-color: var(--border-strong);
  background: linear-gradient(180deg, rgba(120,166,255,0.14), rgba(154,124,255,0.08));
}

.panel-label {
  color: var(--muted);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: var(--space-3);
}

.panel-value {
  font-size: var(--text-lg);
  line-height: 1.35;
}

.section-head { margin-bottom: var(--space-10); }

.section-head h2 {
  font-size: var(--text-xl);
  max-width: 14ch;
  letter-spacing: -0.03em;
}

.section-head p {
  margin-top: var(--space-4);
  color: var(--muted);
  max-width: 34rem;
}

.section-grid { display: grid; gap: var(--space-10); }

.about-cards,
.speakers-grid,
.format-points {
  display: grid;
  gap: var(--space-5);
}

.about-cards { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.card,
.speaker-card,
.format-item,
.register-form,
.agenda-item {
  border: 1px solid var(--border);
  background: var(--surface);
  backdrop-filter: blur(12px);
}

.card,
.speaker-card,
.format-item {
  padding: var(--space-6);
  border-radius: var(--radius-lg);
}

.card h3,
.speaker-card h3,
.format-item h3 {
  font-size: 1.35rem;
  margin-bottom: var(--space-3);
}

.card p,
.speaker-card p,
.format-item p { color: var(--muted); }

.featured-card {
  background: linear-gradient(180deg, rgba(255,255,255,0.06), rgba(120,166,255,0.08));
}

.agenda-list {
  display: grid;
  gap: var(--space-3);
}

.agenda-item {
  display: grid;
  grid-template-columns: 6rem 1fr;
  align-items: center;
  gap: var(--space-4);
  padding: 1.1rem 1.25rem;
  border-radius: 1.1rem;
  transition: border-color var(--transition), transform var(--transition);
}

.agenda-item span {
  color: #d4defd;
  font-variant-numeric: tabular-nums;
  font-size: var(--text-sm);
}

.agenda-item strong {
  font-size: 1.02rem;
  font-weight: 500;
}

.agenda-item:hover {
  border-color: rgba(120,166,255,0.24);
  transform: translateY(-1px);
}

.speakers-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.avatar {
  width: 4rem;
  aspect-ratio: 1;
  border-radius: 50%;
  display: grid;
  place-items: center;
  margin-bottom: var(--space-5);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #ecf2ff;
  background: linear-gradient(135deg, rgba(120,166,255,0.24), rgba(154,124,255,0.28));
  border: 1px solid rgba(255,255,255,0.12);
  box-shadow: inset 0 0 30px rgba(255,255,255,0.04);
}

.format-layout { display: grid; gap: var(--space-10); }
.format-points { grid-template-columns: 1.1fr 1fr 1fr; }

.register-section {
  padding-bottom: clamp(var(--space-20), 12vw, 8rem);
}

.register-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 0.8fr);
  gap: var(--space-10);
  align-items: start;
}

.register-form {
  padding: var(--space-6);
  border-radius: var(--radius-xl);
  display: grid;
  gap: var(--space-4);
  background: var(--surface-strong);
  box-shadow: var(--shadow);
}

.register-form label {
  display: grid;
  gap: var(--space-2);
}

.register-form span {
  color: #dce5ff;
  font-size: var(--text-sm);
}

.register-form input {
  min-height: 3.35rem;
  padding: 0 1rem;
  color: var(--text);
  border-radius: 0.95rem;
  border: 1px solid rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.04);
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}

.register-form input::placeholder { color: var(--faint); }

.register-form input:focus {
  border-color: rgba(120,166,255,0.5);
  box-shadow: 0 0 0 4px rgba(120,166,255,0.12);
  background: rgba(255,255,255,0.06);
}

.form-message {
  display: none;
  padding: 1rem 1.1rem;
  border-radius: 1rem;
  border: 1px solid rgba(112, 235, 179, 0.26);
  background: rgba(72, 181, 132, 0.12);
  color: #dcffee;
}

.form-message.is-visible { display: block; }

.site-footer {
  border-top: 1px solid var(--border);
  background: rgba(6, 8, 14, 0.88);
}

.footer-inner {
  min-height: 7rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  padding: var(--space-6) 0;
}

.footer-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  margin-bottom: 0.2rem;
}

.site-footer p { color: var(--muted); }

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 700ms ease, transform 700ms cubic-bezier(0.16, 1, 0.3, 1);
  transition-delay: var(--delay, 0ms);
}

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

@media (max-width: 960px) {
  .hero-grid,
  .register-grid,
  .about-cards,
  .speakers-grid,
  .format-points {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: var(--space-12);
  }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .nav-menu {
    position: absolute;
    top: calc(100% - 0.5rem);
    right: 1rem;
    left: 1rem;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-3);
    border-radius: 1.25rem;
    border: 1px solid var(--border);
    background: rgba(11, 14, 24, 0.96);
    box-shadow: var(--shadow);
  }

  .nav-menu.open { display: flex; }
  .nav-menu a { padding: 0.95rem 1rem; }
}

@media (max-width: 720px) {
  :root { --header-height: 4.5rem; }
  .container { width: min(calc(100% - 1.25rem), var(--content)); }
  .section { padding: var(--space-16) 0; }
  .hero h1 { max-width: 10ch; }
  .hero-actions { align-items: stretch; }
  .button-primary, .button-secondary { width: 100%; }

  .agenda-item {
    grid-template-columns: 1fr;
    gap: var(--space-2);
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation: none !important;
    transition-duration: 0.01ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}