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

:root {
  --primary: #6C3CE1;
  --primary-dark: #4A1DB5;
  --accent: #00E5A0;
  --accent-glow: rgba(0, 229, 160, 0.3);
  --bg-dark: #0A0E1A;
  --bg-card: #121829;
  --bg-card-hover: #1A2240;
  --text: #E8EAF0;
  --text-muted: #8B92A8;
  --gradient-1: linear-gradient(135deg, #6C3CE1, #00E5A0);
  --gradient-2: linear-gradient(135deg, #6C3CE1, #E040FB);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Noto Sans JP', 'Inter', sans-serif;
  background-color: var(--bg-dark);
  color: var(--text);
  line-height: 1.8;
  overflow-x: hidden;
}

/* ===== Navigation ===== */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1rem 2rem;
  background: rgba(10, 14, 26, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(108, 60, 225, 0.15);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

nav .logo {
  font-family: 'Inter', sans-serif;
  font-weight: 800;
  font-size: 1.3rem;
  background: var(--gradient-1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 2rem;
}

nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  transition: color 0.3s;
}

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

/* ===== Hero ===== */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 8rem 2rem 4rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -40%;
  left: -20%;
  width: 80%;
  height: 80%;
  background: radial-gradient(circle, rgba(108, 60, 225, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  right: -20%;
  width: 60%;
  height: 60%;
  background: radial-gradient(circle, rgba(0, 229, 160, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero-badge {
  display: inline-block;
  padding: 0.4rem 1.2rem;
  border: 1px solid var(--accent);
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--accent);
  margin-bottom: 2rem;
  background: rgba(0, 229, 160, 0.05);
  letter-spacing: 0.05em;
}

.hero h1 {
  font-family: 'Inter', sans-serif;
  font-size: clamp(3rem, 8vw, 6.5rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
  position: relative;
}

.hero h1 .gradient-text {
  background: var(--gradient-1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-date {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.5rem;
}

.hero-venue {
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 2.5rem;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

.btn {
  display: inline-block;
  padding: 0.9rem 2.4rem;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 700;
  text-decoration: none;
  transition: all 0.3s;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--gradient-1);
  color: #fff;
  box-shadow: 0 4px 24px rgba(108, 60, 225, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(108, 60, 225, 0.45);
}

.btn-outline {
  border: 2px solid rgba(255, 255, 255, 0.15);
  color: var(--text);
  background: transparent;
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

/* ===== Stats ===== */
.stats {
  display: flex;
  justify-content: center;
  gap: 4rem;
  padding: 3rem 2rem;
  margin-top: 2rem;
  flex-wrap: wrap;
}

.stat {
  text-align: center;
}

.stat-number {
  font-family: 'Inter', sans-serif;
  font-size: 2.8rem;
  font-weight: 800;
  background: var(--gradient-1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* ===== Section Common ===== */
section {
  padding: 6rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.section-label {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 1rem;
}

.section-desc {
  color: var(--text-muted);
  max-width: 600px;
  margin-bottom: 3rem;
}

/* ===== Topics ===== */
.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.topic-card {
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 16px;
  padding: 2rem;
  transition: all 0.3s;
}

.topic-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(108, 60, 225, 0.3);
  transform: translateY(-4px);
}

.topic-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1.2rem;
  background: rgba(108, 60, 225, 0.12);
}

.topic-card h3 {
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
}

.topic-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ===== Speakers ===== */
.speakers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.speaker-card {
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 16px;
  padding: 2rem;
  text-align: center;
  transition: all 0.3s;
}

.speaker-card:hover {
  border-color: rgba(0, 229, 160, 0.3);
  transform: translateY(-4px);
}

.speaker-avatar {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  margin: 0 auto 1.2rem;
  background: var(--gradient-2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  font-weight: 800;
  color: #fff;
  font-family: 'Inter', sans-serif;
}

.speaker-card h3 {
  font-size: 1.15rem;
  margin-bottom: 0.25rem;
}

.speaker-role {
  font-size: 0.85rem;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.speaker-talk {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ===== Timetable ===== */
.timetable {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.timetable-item {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 2rem;
  padding: 1.8rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  align-items: start;
}

.timetable-time {
  font-family: 'Inter', sans-serif;
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--accent);
  padding-top: 0.15rem;
}

.timetable-content h3 {
  font-size: 1.1rem;
  margin-bottom: 0.3rem;
}

.timetable-content p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.timetable-tag {
  display: inline-block;
  padding: 0.15rem 0.6rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 700;
  margin-top: 0.5rem;
  background: rgba(108, 60, 225, 0.15);
  color: #B794F6;
}

.timetable-tag.keynote {
  background: rgba(0, 229, 160, 0.12);
  color: var(--accent);
}

.timetable-tag.workshop {
  background: rgba(224, 64, 251, 0.12);
  color: #E89CFC;
}

/* ===== Ticket ===== */
#ticket {
  text-align: center;
}

.ticket-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.ticket-card {
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 16px;
  padding: 2.5rem 2rem;
  transition: all 0.3s;
  position: relative;
}

.ticket-card.featured {
  border-color: var(--accent);
  box-shadow: 0 0 40px rgba(0, 229, 160, 0.08);
}

.ticket-card.featured::before {
  content: 'POPULAR';
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent);
  color: var(--bg-dark);
  font-size: 0.75rem;
  font-weight: 800;
  padding: 0.2rem 1rem;
  border-radius: 4px;
}

.ticket-card:hover {
  transform: translateY(-4px);
}

.ticket-type {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
}

.ticket-price {
  font-family: 'Inter', sans-serif;
  font-size: 3rem;
  font-weight: 900;
  margin-bottom: 0.25rem;
}

.ticket-price span {
  font-size: 1rem;
  font-weight: 400;
  color: var(--text-muted);
}

.ticket-features {
  list-style: none;
  margin: 1.5rem 0;
  text-align: left;
}

.ticket-features li {
  padding: 0.4rem 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.ticket-features li::before {
  content: '\2713';
  color: var(--accent);
  font-weight: 700;
  margin-right: 0.75rem;
}

.ticket-card .btn {
  width: 100%;
  text-align: center;
  margin-top: 0.5rem;
}

/* ===== Sponsors ===== */
#sponsors {
  text-align: center;
}

.sponsor-tier {
  margin-bottom: 3rem;
}

.sponsor-tier-label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  font-weight: 700;
}

.sponsor-logos {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 3rem;
  flex-wrap: wrap;
}

.sponsor-logo {
  width: 140px;
  height: 56px;
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Inter', sans-serif;
  font-weight: 800;
  font-size: 0.9rem;
  color: var(--text-muted);
  transition: all 0.3s;
}

.sponsor-logo:hover {
  border-color: rgba(108, 60, 225, 0.3);
  color: var(--text);
}

.sponsor-logo.platinum {
  width: 180px;
  height: 72px;
  font-size: 1.1rem;
}

/* ===== Access ===== */
.access-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.access-info h3 {
  font-size: 1.3rem;
  margin-bottom: 1rem;
}

.access-detail {
  margin-bottom: 1.5rem;
}

.access-detail dt {
  font-size: 0.8rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.access-detail dd {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.access-map {
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 16px;
  height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* ===== CTA ===== */
.cta {
  text-align: center;
  padding: 6rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
}

.cta::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(108, 60, 225, 0.1) 0%, transparent 70%);
  pointer-events: none;
}

.cta h2 {
  font-size: 2.8rem;
  font-weight: 900;
  margin-bottom: 1rem;
}

.cta p {
  color: var(--text-muted);
  margin-bottom: 2rem;
  font-size: 1.1rem;
}

/* ===== Footer ===== */
footer {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding: 3rem 2rem;
  text-align: center;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.85rem;
  transition: color 0.3s;
}

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

.footer-copy {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  nav ul {
    display: none;
  }

  .stats {
    gap: 2rem;
  }

  .timetable-item {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }

  .access-wrapper {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 2.5rem;
  }

  .cta h2 {
    font-size: 2rem;
  }
}

/* ===== Animations ===== */
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.hero-badge {
  animation: float 4s ease-in-out infinite;
}

/* Grid BG pattern */
.hero {
  background-image:
    linear-gradient(rgba(108, 60, 225, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(108, 60, 225, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
}