/* ===== Reset & Base ===== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --teal: #1a7a7a;
  --teal-light: #0d8a8a;
  --teal-dark: #14605f;
  --teal-bg: rgba(26, 122, 122, 0.08);
  --bg: #f5f7fa;
  --bg-white: #ffffff;
  --text: #2d3436;
  --text-light: #636e72;
  --text-lighter: #b2bec3;
  --border: #dfe6e9;
  --shadow: 0 2px 16px rgba(0,0,0,0.06);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.1);
  --radius: 12px;
  --radius-sm: 8px;
  --nav-height: 72px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Network Pattern SVG Background ===== */
.hero-bg-pattern {
  position: absolute;
  inset: 0;
  opacity: 0.06;
  background-image: url("data:image/svg+xml,%3Csvg width='400' height='400' viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' stroke='%231a7a7a' stroke-width='1'%3E%3Ccircle cx='50' cy='50' r='4'/%3E%3Ccircle cx='150' cy='80' r='3'/%3E%3Ccircle cx='250' cy='40' r='5'/%3E%3Ccircle cx='350' cy='70' r='3'/%3E%3Ccircle cx='100' cy='150' r='4'/%3E%3Ccircle cx='200' cy='130' r='3'/%3E%3Ccircle cx='300' cy='160' r='4'/%3E%3Ccircle cx='50' cy='250' r='3'/%3E%3Ccircle cx='150' cy='220' r='5'/%3E%3Ccircle cx='250' cy='260' r='3'/%3E%3Ccircle cx='350' cy='230' r='4'/%3E%3Ccircle cx='100' cy='340' r='3'/%3E%3Ccircle cx='200' cy='310' r='4'/%3E%3Ccircle cx='300' cy='350' r='3'/%3E%3Ccircle cx='50' cy='370' r='4'/%3E%3Ccircle cx='350' cy='380' r='3'/%3E%3Cline x1='50' y1='50' x2='150' y2='80'/%3E%3Cline x1='150' y1='80' x2='250' y2='40'/%3E%3Cline x1='250' y1='40' x2='350' y2='70'/%3E%3Cline x1='50' y1='50' x2='100' y2='150'/%3E%3Cline x1='150' y1='80' x2='200' y2='130'/%3E%3Cline x1='250' y1='40' x2='300' y2='160'/%3E%3Cline x1='350' y1='70' x2='300' y2='160'/%3E%3Cline x1='100' y1='150' x2='200' y2='130'/%3E%3Cline x1='200' y1='130' x2='300' y2='160'/%3E%3Cline x1='100' y1='150' x2='50' y2='250'/%3E%3Cline x1='200' y1='130' x2='150' y2='220'/%3E%3Cline x1='300' y1='160' x2='250' y2='260'/%3E%3Cline x1='300' y1='160' x2='350' y2='230'/%3E%3Cline x1='50' y1='250' x2='150' y2='220'/%3E%3Cline x1='150' y1='220' x2='250' y2='260'/%3E%3Cline x1='250' y1='260' x2='350' y2='230'/%3E%3Cline x1='50' y1='250' x2='100' y2='340'/%3E%3Cline x1='150' y1='220' x2='200' y2='310'/%3E%3Cline x1='250' y1='260' x2='300' y2='350'/%3E%3Cline x1='350' y1='230' x2='300' y2='350'/%3E%3Cline x1='100' y1='340' x2='200' y2='310'/%3E%3Cline x1='200' y1='310' x2='300' y2='350'/%3E%3Cline x1='50' y1='370' x2='100' y2='340'/%3E%3Cline x1='300' y1='350' x2='350' y2='380'/%3E%3C/g%3E%3C/svg%3E");
  background-size: 400px 400px;
  pointer-events: none;
}

/* ===== Navbar ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 1000;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: background 0.3s, box-shadow 0.3s;
}

.navbar.scrolled {
  background: rgba(255,255,255,0.95);
  box-shadow: 0 1px 8px rgba(0,0,0,0.08);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-logo-img {
  height: 40px;
  width: auto;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.2s;
}

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

.nav-cta {
  background: var(--teal);
  color: #fff !important;
  padding: 8px 20px;
  border-radius: 6px;
  font-weight: 600 !important;
  transition: background 0.2s, transform 0.2s !important;
}

.nav-cta:hover {
  background: var(--teal-dark) !important;
  transform: translateY(-1px);
}

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

.nav-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: calc(var(--nav-height) + 40px) 24px 80px;
  overflow: hidden;
}

.hero-venue-bg {
  position: absolute;
  inset: 0;
  background: url('../img/venue.jpg') center center / cover no-repeat;
  z-index: 0;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(255,255,255,0.92) 0%,
    rgba(245,247,250,0.88) 40%,
    rgba(224,240,240,0.82) 70%,
    rgba(26,122,122,0.15) 100%
  );
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
}

.hero-logo {
  height: 72px;
  width: auto;
  margin-bottom: 32px;
}

.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text);
  line-height: 1.15;
  margin-bottom: 16px;
}

.hero-title .year {
  color: var(--teal);
}

.hero-date {
  font-size: 1.15rem;
  color: var(--text-light);
  font-weight: 500;
  margin-bottom: 12px;
}

.hero-tagline {
  font-size: 1.25rem;
  color: var(--teal);
  font-weight: 600;
  font-style: italic;
  margin-bottom: 40px;
}

/* Hero Stats */
.hero-stats {
  display: flex;
  justify-content: center;
  gap: 40px;
  margin-top: 56px;
  flex-wrap: wrap;
}

.hero-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 28px;
  min-width: 130px;
  transition: transform 0.2s, box-shadow 0.2s;
}

.hero-stat:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.hero-stat-number {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--teal);
  line-height: 1;
  margin-bottom: 6px;
}

.hero-stat-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ===== Buttons ===== */
.btn {
  display: inline-block;
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  border-radius: 8px;
  padding: 12px 32px;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
}

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

.btn-primary:hover {
  background: var(--teal-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(26, 122, 122, 0.3);
}

.btn-lg {
  padding: 16px 48px;
  font-size: 1.1rem;
  border-radius: 10px;
}

/* ===== Sections ===== */
.section {
  padding: 100px 0;
}

.section:nth-child(even) {
  background: var(--bg-white);
}

.section-title {
  text-align: center;
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  font-weight: 800;
  color: var(--text);
  margin-bottom: 56px;
  letter-spacing: -0.01em;
}

.section-title::after {
  content: '';
  display: block;
  width: 48px;
  height: 3px;
  background: var(--teal);
  margin: 16px auto 0;
  border-radius: 2px;
}

/* ===== About ===== */
.about-description {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 56px;
  font-size: 1.1rem;
  color: var(--text-light);
  line-height: 1.8;
}

.topics-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.topic-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  transition: transform 0.2s, box-shadow 0.2s;
}

.topic-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.topic-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 16px;
  color: var(--teal);
}

.topic-icon svg {
  width: 100%;
  height: 100%;
}

.topic-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--teal);
  margin-bottom: 8px;
}

.topic-card p {
  font-size: 0.9rem;
  color: var(--text-light);
}

/* ===== Speakers ===== */
.speakers {
  background: var(--bg) !important;
}

.speakers-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.speaker-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 28px 28px;
  text-align: center;
  transition: transform 0.2s, box-shadow 0.2s;
  position: relative;
}

.speaker-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.speaker-avatar {
  width: 110px;
  height: 110px;
  border-radius: 50%;
  border: 3px solid var(--teal);
  overflow: hidden;
  margin: 0 auto 16px;
  box-shadow: 0 4px 12px rgba(26, 122, 122, 0.25);
}

.speaker-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.speaker-topic-badge {
  display: inline-block;
  background: var(--teal-bg);
  color: var(--teal);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 14px;
  letter-spacing: 0.02em;
}

.speaker-name {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 6px;
}

.speaker-role {
  font-size: 0.85rem;
  color: var(--teal);
  font-weight: 500;
  margin-bottom: 14px;
  line-height: 1.4;
}

.speaker-bio {
  font-size: 0.85rem;
  color: var(--text-light);
  line-height: 1.6;
  margin-bottom: 16px;
}

.speaker-linkedin {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--teal);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  transition: color 0.2s;
}

.speaker-linkedin:hover {
  color: var(--teal-dark);
}

.speaker-linkedin svg {
  width: 18px;
  height: 18px;
}

/* ===== Schedule ===== */
.timeline {
  max-width: 700px;
  margin: 0 auto;
  position: relative;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 120px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border);
}

.timeline-item {
  display: flex;
  gap: 32px;
  padding: 20px 0;
  position: relative;
}

.timeline-item::after {
  content: '';
  position: absolute;
  left: 114px;
  top: 28px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--bg-white);
  border: 3px solid var(--border);
}

.timeline-session::after {
  border-color: var(--teal);
  background: var(--teal-bg);
}

.timeline-break::after {
  border-color: var(--text-lighter);
}

.timeline-time {
  min-width: 100px;
  text-align: right;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-light);
  padding-top: 4px;
  flex-shrink: 0;
}

.timeline-content {
  padding-left: 20px;
  flex: 1;
}

.timeline-content h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}

.timeline-session .timeline-content h3 {
  color: var(--teal);
}

.timeline-content p {
  font-size: 0.88rem;
  color: var(--text-light);
}

.session-badge {
  display: inline-block;
  background: var(--teal);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 2px 10px;
  border-radius: 4px;
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.session-speaker {
  font-weight: 500;
  color: var(--text) !important;
}

/* ===== Pricing ===== */
.pricing {
  background: var(--bg) !important;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: start;
}

.pricing-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px 32px;
  text-align: center;
  position: relative;
  transition: transform 0.2s, box-shadow 0.2s;
}

.pricing-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.pricing-active {
  border-color: var(--teal);
  border-width: 2px;
  box-shadow: var(--shadow);
  transform: scale(1.04);
  position: relative;
}

.pricing-active::before {
  content: 'Available Now';
  position: absolute;
  top: -13px;
  right: 16px;
  background: #27ae60;
  color: #fff;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 3px 12px;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.pricing-active:hover {
  transform: scale(1.04) translateY(-4px);
}

.pricing-inactive {
  opacity: 0.5;
  filter: grayscale(0.3);
}

.pricing-inactive .btn-primary {
  background: var(--text-lighter);
  pointer-events: none;
}

.pricing-badge {
  position: absolute;
  top: -13px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--teal);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 16px;
  border-radius: 20px;
  white-space: nowrap;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.pricing-tier {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
  margin-top: 8px;
}

.pricing-price {
  font-size: 3rem;
  font-weight: 800;
  color: var(--teal);
  line-height: 1;
  margin-bottom: 4px;
}

.pricing-period {
  font-size: 0.88rem;
  color: var(--text-light);
  margin-bottom: 28px;
}

.pricing-features {
  list-style: none;
  text-align: left;
  margin-bottom: 32px;
}

.pricing-features li {
  padding: 8px 0;
  font-size: 0.9rem;
  color: var(--text-light);
  border-bottom: 1px solid var(--border);
  padding-left: 24px;
  position: relative;
}

.pricing-features li:last-child {
  border-bottom: none;
}

.pricing-features li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 14px;
  width: 14px;
  height: 14px;
  background: var(--teal-bg);
  border-radius: 50%;
  border: 2px solid var(--teal);
}

.pricing-note {
  text-align: center;
  margin-top: 40px;
  font-size: 0.95rem;
  color: var(--text-light);
}

.pricing-note strong {
  color: var(--teal);
}

/* ===== Footer ===== */
.footer {
  background: var(--text);
  color: rgba(255,255,255,0.7);
  padding: 64px 0 32px;
}

.footer-content {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand-name {
  font-size: 1.4rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 4px;
  letter-spacing: 0.05em;
}

.footer-brand p {
  font-size: 0.9rem;
}

.footer h4 {
  color: #fff;
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.footer p {
  font-size: 0.88rem;
  line-height: 1.7;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  text-align: center;
  font-size: 0.82rem;
  color: rgba(255,255,255,0.4);
}

.footer-bottom p + p {
  margin-top: 4px;
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .topics-grid,
  .speakers-grid,
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .pricing-active {
    transform: scale(1);
  }

  .pricing-active:hover {
    transform: translateY(-4px);
  }

  .footer-content {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.1);
  }

  .nav-links.active {
    display: flex;
  }

  .hero {
    min-height: auto;
    padding: calc(var(--nav-height) + 60px) 24px 80px;
  }

  .hero-logo {
    height: 56px;
  }

  .hero-stats {
    gap: 16px;
  }

  .hero-stat {
    padding: 16px 20px;
    min-width: 100px;
  }

  .hero-stat-number {
    font-size: 1.6rem;
  }

  .section {
    padding: 72px 0;
  }

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

  .speakers-grid {
    grid-template-columns: 1fr;
    max-width: 420px;
    margin: 0 auto;
  }

  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 380px;
    margin: 0 auto;
  }

  /* Schedule responsive */
  .timeline::before {
    left: 16px;
  }

  .timeline-item {
    flex-direction: column;
    gap: 8px;
    padding-left: 40px;
  }

  .timeline-item::after {
    left: 10px;
    top: 4px;
  }

  .timeline-time {
    text-align: left;
    min-width: auto;
  }

  .timeline-content {
    padding-left: 0;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

@media (max-width: 480px) {
  .topics-grid {
    grid-template-columns: 1fr;
  }

  .hero-title {
    font-size: 1.8rem;
  }

  .hero-tagline {
    font-size: 1.05rem;
  }
}