* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  color-scheme: dark;
  --bg: #0b0f1a;
  --surface: rgba(16, 23, 41, 0.9);
  --card: rgba(20, 29, 52, 0.9);
  --accent: #7c5cff;
  --accent-light: #9c86ff;
  --mint: #41f0c1;
  --text: #f4f6ff;
  --muted: #b4bedb;
  --shadow: 0 20px 60px rgba(12, 18, 36, 0.45);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Manrope", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  opacity: 0;
  transition: opacity 1.2s ease;
}

body.page-ready {
  opacity: 1;
}

img {
  width: 100%;
  display: block;
  border-radius: 18px;
}

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

.container {
  width: min(1200px, 92%);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 14, 25, 0.8);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(124, 92, 255, 0.15);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
  gap: 24px;
}

.logo {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: 0.5px;
}

.logo span {
  color: var(--accent-light);
}

.nav {
  display: flex;
  gap: 22px;
  font-weight: 500;
  color: var(--muted);
}

.nav a {
  transition: color 0.2s ease;
}

.nav a:hover {
  color: var(--text);
}

.nav-toggle {
  display: none;
  border: none;
  background: transparent;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  margin: 5px 0;
  transition: transform 0.3s ease;
}

.hero {
  position: relative;
  min-height: 90vh;
  display: grid;
  align-items: center;
  overflow: hidden;
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(1.1);
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at top, rgba(12, 16, 32, 0.2), var(--bg));
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  padding: 140px 0 110px;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 1.4s ease, transform 1.4s ease;
}

.demo-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(65, 240, 193, 0.12);
  border: 1px solid rgba(65, 240, 193, 0.35);
  color: var(--mint);
  font-weight: 600;
  font-size: 0.8rem;
  letter-spacing: 0.6px;
  margin-bottom: 16px;
}

body.page-ready .hero-content {
  opacity: 1;
  transform: translateY(0);
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 2px;
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--mint);
  margin-bottom: 12px;
}

h1 {
  font-size: clamp(2.6rem, 5vw, 4.5rem);
  line-height: 1.1;
  margin-bottom: 20px;
}

.tagline {
  max-width: 540px;
  color: var(--muted);
  margin-bottom: 28px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}

.btn {
  padding: 12px 26px;
  border-radius: 999px;
  font-weight: 600;
  border: 1px solid transparent;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.3s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn.primary {
  background: linear-gradient(120deg, var(--accent), var(--accent-light));
  color: white;
  box-shadow: 0 14px 35px rgba(124, 92, 255, 0.35);
}

.btn.primary:hover {
  transform: translateY(-2px) scale(1.01);
}

.btn.ghost {
  border-color: rgba(255, 255, 255, 0.2);
  color: var(--text);
}

.btn.ghost:hover {
  background: rgba(255, 255, 255, 0.08);
}

.countdown {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(90px, 1fr));
  gap: 16px;
  max-width: 520px;
}

.countdown div {
  background: rgba(12, 18, 36, 0.6);
  border: 1px solid rgba(124, 92, 255, 0.2);
  border-radius: 16px;
  padding: 16px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: transform 0.3s ease;
}

.countdown div:hover {
  transform: translateY(-4px);
}

.countdown span {
  font-size: 1.8rem;
  font-weight: 700;
  display: block;
}

section {
  padding: 90px 0;
}

.section-heading {
  max-width: 680px;
  margin-bottom: 40px;
}

.section-heading h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: 12px;
}

.section-heading p {
  color: var(--muted);
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 24px;
}

.about-card {
  background: var(--card);
  padding: 26px;
  border-radius: 20px;
  box-shadow: var(--shadow);
  border: 1px solid rgba(124, 92, 255, 0.2);
  transition: transform 0.3s ease, border 0.3s ease;
}

.about-card:hover {
  transform: translateY(-6px);
  border-color: rgba(124, 92, 255, 0.6);
}

.about-card .icon {
  font-size: 1.6rem;
  display: inline-block;
  margin-bottom: 12px;
}

.speakers {
  background: linear-gradient(180deg, rgba(9, 13, 26, 0.8), rgba(9, 13, 26, 1));
}

.speaker-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 22px;
}

.speaker-card {
  perspective: 1000px;
}

.speaker-inner {
  position: relative;
  width: 100%;
  min-height: 340px;
  transform-style: preserve-3d;
  transition: transform 0.6s ease;
}

.speaker-card:hover .speaker-inner {
  transform: rotateY(180deg);
}

.speaker-front,
.speaker-back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  background: var(--card);
  border-radius: 22px;
  padding: 20px;
  border: 1px solid rgba(124, 92, 255, 0.2);
  box-shadow: var(--shadow);
}

.speaker-front {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.speaker-front img {
  height: 220px;
  object-fit: cover;
}

.speaker-back {
  transform: rotateY(180deg);
  display: grid;
  place-content: center;
  text-align: center;
  gap: 10px;
}

.speaker-info {
  margin-top: 16px;
}

.speaker-info p {
  color: var(--muted);
  font-size: 0.95rem;
}

.tabs {
  background: var(--card);
  border-radius: 22px;
  padding: 24px;
  border: 1px solid rgba(124, 92, 255, 0.2);
  box-shadow: var(--shadow);
}

.tab-buttons {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.tab-btn {
  padding: 10px 18px;
  border-radius: 999px;
  border: 1px solid rgba(124, 92, 255, 0.3);
  background: transparent;
  color: var(--text);
  cursor: pointer;
  transition: background 0.3s ease;
}

.tab-btn.active,
.tab-btn:hover {
  background: rgba(124, 92, 255, 0.25);
}

.tab-panel {
  display: none;
  animation: fadeIn 0.5s ease;
}

.tab-panel.active {
  display: grid;
  gap: 16px;
}

.session {
  padding: 16px 20px;
  border-radius: 16px;
  background: rgba(9, 13, 26, 0.8);
  border: 1px solid rgba(124, 92, 255, 0.15);
}

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

.registration-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 36px;
  align-items: stretch;
}

.ticket-list {
  display: grid;
  gap: 16px;
}

.ticket-list div {
  padding: 18px 20px;
  border-radius: 16px;
  border: 1px solid rgba(124, 92, 255, 0.15);
  background: rgba(9, 13, 26, 0.7);
}

.ticket-list h4 {
  margin-bottom: 6px;
}

.registration-form {
  background: var(--card);
  border-radius: 20px;
  padding: 26px;
  box-shadow: var(--shadow);
  display: grid;
  gap: 16px;
  height: 100%;
  align-content: start;
}

.registration-form label {
  display: grid;
  gap: 6px;
  font-weight: 600;
}

.registration-form input,
.registration-form select {
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid rgba(124, 92, 255, 0.25);
  background: rgba(8, 12, 24, 0.8);
  color: var(--text);
  font-size: 0.95rem;
}

.registration-form input:focus,
.registration-form select:focus {
  outline: 2px solid rgba(124, 92, 255, 0.6);
}

.submit-btn {
  position: relative;
  overflow: hidden;
}

.submit-btn.submitted {
  background: linear-gradient(120deg, #2dd4bf, #22c55e);
  box-shadow: 0 12px 30px rgba(34, 197, 94, 0.3);
}

.submit-btn::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(255, 255, 255, 0.4), transparent);
  transform: translateX(-100%);
  transition: transform 0.5s ease;
}

.submit-btn:hover::after {
  transform: translateX(100%);
}

.form-note {
  font-size: 0.85rem;
  color: var(--muted);
}

.highlights .carousel {
  display: block;
}

.carousel-track {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 22px;
}

.carousel-item {
  background: var(--card);
  padding: 18px;
  border-radius: 20px;
  border: 1px solid rgba(124, 92, 255, 0.15);
  text-align: center;
}

.carousel-item img {
  height: 200px;
  object-fit: cover;
}

.carousel-item p {
  margin-top: 12px;
  color: var(--muted);
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.9s ease, transform 0.9s ease;
  transition-delay: var(--delay, 0s);
}

.reveal.in-view {
  opacity: 1;
  transform: translateY(0);
}

.site-footer {
  padding: 40px 0 60px;
  border-top: 1px solid rgba(124, 92, 255, 0.2);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  color: var(--muted);
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 900px) {
  .nav {
    position: absolute;
    top: 70px;
    right: 4%;
    background: rgba(10, 14, 25, 0.98);
    padding: 18px;
    border-radius: 16px;
    flex-direction: column;
    transform: translateY(-10px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease, transform 0.3s ease;
  }

  .nav.open {
    opacity: 1;
    pointer-events: all;
    transform: translateY(0);
  }

  .nav-toggle {
    display: block;
  }

  .header-content {
    position: relative;
  }
}

@media (max-width: 700px) {
  .hero-content {
    padding: 120px 0 90px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .carousel-track {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  }

  .countdown {
    grid-template-columns: repeat(2, minmax(90px, 1fr));
  }
}