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

:root {
  --rust: #b7410e;
  --rust-dark: #8b2f08;
  --rust-light: #e05a2b;
  --bg: #0f0f0f;
  --bg-section: #1a1a1a;
  --text: #f0f0f0;
  --text-muted: #999;
  --border: #2e2e2e;
}

body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

a {
  color: var(--rust-light);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* Header */

header {
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--rust-light);
  letter-spacing: -0.5px;
}

.logo span {
  color: var(--text-muted);
  font-weight: 400;
}

nav a {
  margin-left: 2rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  transition: color 0.2s;
}

nav a:hover {
  color: var(--text);
  text-decoration: none;
}

/* Hero */

.hero {
  background: linear-gradient(135deg, #0f0f0f 0%, #1c0c05 50%, #0f0f0f 100%);
  padding: 7rem 2rem 6rem;
  text-align: center;
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 50% at 50% 0%, rgba(183, 65, 14, 0.18) 0%, transparent 70%);
  pointer-events: none;
}

.hero-tag {
  display: inline-block;
  background: rgba(183, 65, 14, 0.2);
  border: 1px solid var(--rust);
  color: var(--rust-light);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.3rem 0.9rem;
  border-radius: 2rem;
  margin-bottom: 2rem;
}

.hero h1 {
  font-size: clamp(2.8rem, 6vw, 5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -1px;
  margin-bottom: 1.5rem;
  color: var(--text);
}

.hero h1 .accent {
  color: var(--rust-light);
}

.hero-sub {
  font-size: 1.25rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.hero-place {
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 3rem;
}

.hero-place strong {
  color: var(--text);
}

.btn {
  display: inline-block;
  padding: 0.85rem 2.2rem;
  border-radius: 6px;
  font-size: 1rem;
  font-weight: 600;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--rust);
  color: #fff;
}

.btn-primary:hover {
  background: var(--rust-light);
  text-decoration: none;
}

.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
  margin-left: 1rem;
}

.btn-outline:hover {
  border-color: var(--rust-light);
  color: var(--rust-light);
  text-decoration: none;
}

/* Sections */

section {
  padding: 5rem 2rem;
  border-bottom: 1px solid var(--border);
}

.container {
  max-width: 1100px;
  margin: 0 auto;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  letter-spacing: -0.5px;
}

.section-sub {
  color: var(--text-muted);
  margin-bottom: 3rem;
}

/* About */

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

.about-card {
  background: var(--bg-section);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 2rem;
}

.about-card .icon {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.about-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.about-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* Speakers */

.speakers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
}

.speaker-card {
  background: var(--bg-section);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 2rem 1.5rem;
  text-align: center;
}

.speaker-avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--rust-dark), var(--rust-light));
  margin: 0 auto 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  font-weight: 700;
  color: #fff;
}

.speaker-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

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

/* Schedule */

.schedule-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.schedule-day {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--rust-light);
  margin-bottom: 0.5rem;
  margin-top: 1.5rem;
}

.schedule-day:first-child {
  margin-top: 0;
}

.schedule-item {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 1.5rem;
  background: var(--bg-section);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  align-items: start;
}

.schedule-time {
  color: var(--rust-light);
  font-size: 0.9rem;
  font-weight: 600;
  padding-top: 0.1rem;
}

.schedule-talk h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.2rem;
}

.schedule-talk p {
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* Venue */

.venue-info {
  background: var(--bg-section);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 2.5rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.venue-info h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.venue-info p {
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
}

.venue-info strong {
  color: var(--text);
}

.venue-map {
  background: var(--border);
  border-radius: 8px;
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Registration */

.reg-section {
  background: linear-gradient(135deg, #1a0a04, #0f0f0f);
  text-align: center;
}

.reg-section .section-title {
  margin-bottom: 1rem;
}

.reg-section .section-sub {
  margin-bottom: 2.5rem;
}

.reg-form {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.reg-form input[type="email"] {
  padding: 0.85rem 1.25rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg-section);
  color: var(--text);
  font-size: 1rem;
  width: 320px;
  max-width: 100%;
}

.reg-form input[type="email"]:focus {
  outline: none;
  border-color: var(--rust);
}

.reg-form input::placeholder {
  color: var(--text-muted);
}

/* Footer */

footer {
  background: var(--bg);
  padding: 2.5rem 2rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
}

.footer-logo {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--rust-light);
  margin-bottom: 0.5rem;
}

/* Responsive */

@media (max-width: 768px) {
  nav {
    display: none;
  }

  .venue-info {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .btn-outline {
    margin-left: 0;
    margin-top: 0.75rem;
  }

  .hero-buttons {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
  }

  .hero-buttons .btn-outline {
    margin-left: 0;
  }
}