:root {
  --blue: #4285F4;
  --red: #EA4335;
  --yellow: #FBBC05;
  --green: #34A853;
  --text: #202124;
  --text-secondary: #5f6368;
  --border: #e8eaed;
  --bg: #ffffff;
  --bg-alt: #f8f9fa;
}

* { box-sizing: border-box; }

html { overflow-x: hidden; }

body {
  margin: 0;
  font-family: 'Google Sans', 'Roboto', Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

a { color: inherit; }

/* Header */
.site-header {
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(6px);
  z-index: 10;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-name {
  font-size: 18px;
  font-weight: 500;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 14px;
  font-weight: 500;
}

.site-nav a {
  text-decoration: none;
  color: var(--text-secondary);
}

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

.nav-cta {
  background: var(--blue);
  color: #fff !important;
  padding: 8px 20px;
  border-radius: 20px;
}

.nav-cta:hover { background: #1a73e8; }

/* Hero */
.hero {
  padding: 80px 0 64px;
  background: var(--bg-alt);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 48px;
  align-items: center;
}

.eyebrow {
  color: var(--blue);
  font-weight: 500;
  font-size: 14px;
  letter-spacing: 0.3px;
  margin: 0 0 12px;
}

.eyebrow.center { text-align: center; }

.hero-copy h1 {
  font-size: 44px;
  line-height: 1.15;
  margin: 0 0 20px;
  font-weight: 400;
}

.hero-desc {
  font-size: 17px;
  line-height: 1.6;
  color: var(--text-secondary);
  margin: 0 0 32px;
  max-width: 560px;
}

/* Countdown */
.countdown {
  display: flex;
  gap: 16px;
  margin-bottom: 32px;
}

.countdown-unit {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 18px;
  text-align: center;
  min-width: 72px;
}

.countdown-num {
  display: block;
  font-size: 28px;
  font-weight: 500;
  color: var(--blue);
}

.countdown-label {
  display: block;
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 4px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  font-size: 15px;
  font-weight: 500;
  padding: 12px 28px;
  border-radius: 24px;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s ease, box-shadow 0.15s ease;
}

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

.btn-primary:hover {
  background: #1a73e8;
  box-shadow: 0 1px 6px rgba(66,133,244,0.4);
}

.btn-block {
  width: 100%;
  text-align: center;
}

.hero-meta {
  font-size: 14px;
  color: var(--text-secondary);
}

.hero-visual {
  display: flex;
  justify-content: center;
}

.visual-card {
  width: 280px;
  height: 280px;
  border-radius: 24px;
  background: #fff;
  border: 1px solid var(--border);
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: 16px;
  padding: 32px;
}

.dot {
  border-radius: 16px;
}

.dot-blue { background: var(--blue); }
.dot-red { background: var(--red); }
.dot-yellow { background: var(--yellow); }
.dot-green { background: var(--green); }

/* Sections */
.section-title {
  font-size: 32px;
  font-weight: 400;
  margin: 0 0 40px;
}

.section-title.center { text-align: center; }

.agenda, .speakers {
  padding: 72px 0;
}

.speakers { background: var(--bg-alt); }

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

.card {
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px;
}

.card-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 500;
  font-size: 14px;
  color: #fff;
  margin-bottom: 20px;
}

.icon-blue { background: var(--blue); }
.icon-red { background: var(--red); }
.icon-yellow { background: var(--yellow); color: #202124; }

.card h3 {
  font-size: 19px;
  font-weight: 500;
  margin: 0 0 12px;
}

.card p {
  font-size: 15px;
  line-height: 1.6;
  color: var(--text-secondary);
  margin: 0;
}

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

.speaker-avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 26px;
  font-weight: 500;
}

.avatar-blue { background: var(--blue); }
.avatar-red { background: var(--red); }
.avatar-green { background: var(--green); }

.speaker h4 {
  margin: 0 0 4px;
  font-size: 17px;
  font-weight: 500;
}

.speaker p {
  margin: 0;
  font-size: 14px;
  color: var(--text-secondary);
}

/* Register */
.register-section {
  padding: 72px 0;
}

.register-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.register-copy p {
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.6;
}

.register-form {
  background: var(--bg-alt);
  border-radius: 16px;
  padding: 32px;
  display: grid;
  gap: 18px;
}

.form-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-row label {
  font-size: 13px;
  color: var(--text-secondary);
}

.form-row input[type="text"],
.form-row input[type="email"] {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 15px;
  font-family: inherit;
}

.form-row input[type="text"]:focus,
.form-row input[type="email"]:focus {
  outline: 2px solid var(--blue);
  outline-offset: 1px;
}

.checkbox-row {
  flex-direction: row;
  align-items: center;
  gap: 10px;
}

.checkbox-row label {
  font-size: 14px;
  color: var(--text);
}

.form-note {
  font-size: 14px;
  color: var(--green);
  margin: 0;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 24px 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-secondary);
}

.footer-links a {
  text-decoration: none;
  margin-left: 16px;
  color: var(--text-secondary);
}

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

@media (max-width: 860px) {
  .hero-grid, .register-inner { grid-template-columns: 1fr; }
  .hero-visual { display: none; }
  .card-grid, .speaker-grid { grid-template-columns: 1fr; }
  .hero-copy h1 { font-size: 34px; }
  .hero { padding: 48px 0 40px; }
  .agenda, .speakers, .register-section { padding: 48px 0; }
  .section-title { font-size: 26px; margin-bottom: 28px; }
}

@media (max-width: 640px) {
  .container { padding: 0 16px; }

  .header-inner { height: 56px; }
  .brand-name { font-size: 16px; }
  .site-nav { gap: 14px; font-size: 13px; }
  .nav-cta { padding: 6px 14px; }

  .hero-copy h1 { font-size: 28px; }
  .hero-desc { font-size: 15px; }

  .countdown {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
  }
  .countdown-unit { min-width: 0; padding: 10px 6px; }
  .countdown-num { font-size: 20px; }
  .countdown-label { font-size: 10px; }

  .hero-actions { flex-direction: column; align-items: stretch; gap: 12px; }
  .btn { text-align: center; }
  .hero-meta { text-align: center; }

  .card { padding: 24px; }
  .register-form { padding: 24px; }

  .footer-inner { flex-direction: column; gap: 8px; text-align: center; }
  .footer-links a { margin: 0 8px; }
}