:root {
  --bg: #f6f9fd;
  --surface: #ffffff;
  --surface-2: #eef3fa;
  --ink: #0b1320;
  --ink-2: #1a2540;
  --muted: #5b6478;
  --line: #e3eaf3;
  --line-2: #d6dfee;
  --accent: #2563eb;
  --accent-2: #0078d4;
  --accent-soft: #e8f0fe;
  --shadow-sm: 0 1px 2px rgba(15,23,42,0.05);
  --shadow-md: 0 8px 28px rgba(15,23,42,0.08);
  --radius: 12px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.6;
  font-feature-settings: 'cv11', 'ss01';
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(246,249,253,0.85);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; letter-spacing: -0.01em; }
.brand-mark {
  width: 22px; height: 22px; display: inline-grid;
  grid-template-columns: 1fr 1fr; grid-template-rows: 1fr 1fr; gap: 2px;
}
.brand-mark::before, .brand-mark::after {
  content: ''; background: var(--accent-2);
}
.brand-mark {
  background:
    linear-gradient(#f25022,#f25022) 0 0/10px 10px no-repeat,
    linear-gradient(#7fba00,#7fba00) 12px 0/10px 10px no-repeat,
    linear-gradient(#00a4ef,#00a4ef) 0 12px/10px 10px no-repeat,
    linear-gradient(#ffb900,#ffb900) 12px 12px/10px 10px no-repeat;
}
.brand-mark::before, .brand-mark::after { display: none; }
.nav-links { display: flex; gap: 28px; }
.nav-links a { color: var(--muted); font-size: 14px; font-weight: 500; transition: color .15s; }
.nav-links a:hover { color: var(--ink); }

/* Buttons */
.btn {
  display: inline-block; padding: 12px 22px; border-radius: 8px;
  font-weight: 600; font-size: 15px;
  transition: transform .12s, box-shadow .15s, background .15s, border-color .15s;
  border: 1px solid transparent; cursor: pointer; letter-spacing: -0.005em;
}
.btn-sm { padding: 8px 16px; font-size: 13px; }
.btn-lg { padding: 14px 28px; font-size: 16px; }
.btn-primary {
  background: var(--ink);
  color: #ffffff;
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover { background: #000; transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn-ghost {
  background: transparent; color: var(--ink); border-color: var(--line-2);
}
.btn-ghost:hover { background: var(--surface); border-color: var(--ink); }

/* Hero */
.hero {
  position: relative; overflow: hidden;
  padding: 112px 0 96px;
  background:
    radial-gradient(900px 500px at 80% -10%, rgba(37,99,235,0.10), transparent 60%),
    radial-gradient(800px 480px at -10% 30%, rgba(0,120,212,0.08), transparent 65%);
  border-bottom: 1px solid var(--line);
}
/* Info cards (hero) */
.info-cards {
  list-style: none; padding: 0; margin: 0 0 36px;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px;
  text-align: left;
}
.info-card {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 22px 22px 20px;
  box-shadow: 0 1px 0 rgba(15,23,42,0.02), 0 12px 28px rgba(15,23,42,0.05);
  transition: transform .15s, box-shadow .15s, border-color .15s;
}
.info-card:hover {
  transform: translateY(-2px);
  border-color: #dde6f3;
  box-shadow: 0 1px 0 rgba(15,23,42,0.02), 0 18px 36px rgba(15,23,42,0.08);
}
.info-icon {
  width: 28px; height: 28px; color: #2f5cff;
  margin-bottom: 18px;
}
.info-label {
  display: block; font-size: 12px; letter-spacing: 0.18em;
  text-transform: uppercase; color: #9aa3b5;
  font-weight: 600; margin-bottom: 8px;
}
.info-value {
  display: block; font-size: 17px; font-weight: 700;
  color: var(--ink); letter-spacing: -0.01em; line-height: 1.35;
}
@media (max-width: 980px) {
  .info-cards { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 520px) {
  .info-cards { grid-template-columns: 1fr; }
}

.tagline {
  font-size: 20px; margin: 0 0 36px;
  color: var(--muted); font-weight: 500;
  letter-spacing: -0.005em; line-height: 1.5;
}

.hero-inner { position: relative; z-index: 2; max-width: 880px; }
.hero-center { max-width: 980px; margin: 0 auto; text-align: center; }
.hero-center .tagline { margin-left: auto; margin-right: auto; }
.hero-center .hero-meta { justify-content: center; }
.hero-center .hero-cta { justify-content: center; }
.hero-architecture {
  margin: 48px auto 0 !important;
  max-width: 980px;
  border-radius: 20px;
}
.hero-center .info-cards { margin-top: 50px !important; }
.hero-architecture img { padding: 32px; }
@media (max-width: 820px) {
  .hero-architecture { margin: 32px auto 28px; border-radius: 14px; }
  .hero-architecture img { padding: 14px; }
}
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 14px; border-radius: 999px;
  background: var(--surface); border: 1px solid var(--line);
  font-size: 12px; color: var(--ink-2); letter-spacing: 0.06em; text-transform: uppercase;
  margin-bottom: 28px; font-weight: 600; box-shadow: var(--shadow-sm);
}
.eyebrow::before {
  content: ''; width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent); box-shadow: 0 0 0 4px rgba(37,99,235,0.18);
}
.hero h1 {
  font-size: clamp(40px, 5.6vw, 68px);
  line-height: 1.04; letter-spacing: -0.03em; margin: 0 0 22px;
  font-weight: 800; color: var(--ink);
}
.hero h1 .grad {
  background: linear-gradient(120deg, #0078d4 0%, #2563eb 50%, #6b3eea 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.tagline { font-size: 19px; color: var(--muted); margin: 0 0 36px; max-width: 660px; line-height: 1.55; }
.hero-meta {
  list-style: none; padding: 0; margin: 0 0 40px;
  display: flex; flex-wrap: wrap; gap: 10px 22px;
  color: var(--muted); font-size: 15px;
}
.hero-meta strong { color: var(--ink); font-weight: 600; }
.hero-meta li { position: relative; padding-right: 22px; }
.hero-meta li:not(:last-child)::after {
  content: ''; position: absolute; right: 0; top: 50%;
  width: 4px; height: 4px; border-radius: 50%; background: var(--line-2);
  transform: translateY(-50%);
}
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; }

.hero-texture { position: absolute; inset: 0; pointer-events: none; opacity: 0.55; }
.hero-texture svg { width: 100%; height: 100%; }

/* Sections */
.section { padding: 56px 0; border-bottom: 1px solid var(--line); }
.section-alt { background: var(--surface); }
.section-head { margin-bottom: 36px; max-width: 760px; }
.kicker {
  display: inline-block; font-size: 12px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--accent-2); margin-bottom: 14px; font-weight: 700;
}
.section h2 {
  font-size: clamp(28px, 3.4vw, 42px); letter-spacing: -0.025em; margin: 0;
  font-weight: 700; line-height: 1.15; color: var(--ink);
}
.two-col {
  display: grid; grid-template-columns: 1.05fr 1fr; gap: 64px; align-items: center;
}
.two-col h2 { font-size: clamp(26px, 3vw, 38px); }
.lead { font-size: 17px; color: var(--muted); margin: 0; line-height: 1.65; }

/* Agenda */
.agenda { list-style: none; padding: 0; margin: 0; border-top: 1px solid var(--line); }
.agenda li {
  display: grid; grid-template-columns: 140px 1fr auto;
  gap: 24px; padding: 24px 8px; align-items: center;
  border-bottom: 1px solid var(--line);
  transition: background .15s, padding-left .15s;
}
.agenda li:hover { background: var(--surface); padding-left: 18px; }
.agenda .time { color: var(--accent-2); font-weight: 600; font-variant-numeric: tabular-nums; font-size: 15px; }
.agenda .title { color: var(--ink); font-weight: 500; font-size: 17px; letter-spacing: -0.01em; }
.agenda .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--line-2); }
.agenda li:hover .dot { background: var(--accent); }

/* Cards */
.cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.card {
  padding: 32px; border-radius: var(--radius);
  background: var(--bg); border: 1px solid var(--line);
  transition: transform .2s, border-color .2s, box-shadow .2s;
}
.section-alt .card { background: var(--bg); }
.card:hover { transform: translateY(-3px); border-color: var(--line-2); box-shadow: var(--shadow-md); }
.card-icon {
  width: 40px; height: 40px; border-radius: 8px;
  background: var(--accent-soft); color: var(--accent-2);
  display: grid; place-items: center; margin-bottom: 18px;
  font-weight: 700;
}
.card h3 { margin: 0 0 10px; font-size: 19px; letter-spacing: -0.015em; color: var(--ink); }
.card p { margin: 0; color: var(--muted); font-size: 15px; line-height: 1.6; }

/* Speakers */
.speakers { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.speaker {
  padding: 28px 22px 24px; border-radius: var(--radius);
  background: #ffffff; border: 1px solid var(--line);
  text-align: center; transition: transform .2s, box-shadow .2s, border-color .2s;
}
.section-alt .speaker { background: #ffffff; }
.speaker:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); border-color: var(--line-2); }
.avatar {
  width: 80px; height: 80px; border-radius: 50%;
  margin: 4px auto 16px;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 22px; color: #fff;
  background: linear-gradient(135deg, #0078d4, #2563eb);
  letter-spacing: 0.02em;
  box-shadow: 0 6px 18px rgba(37,99,235,0.25);
  overflow: hidden;
}
.avatar img { width: 100%; height: 100%; object-fit: cover; object-position: center top; display: block; }
.avatar.has-img { background: #eef3fa; }
.speaker:nth-child(2n) .avatar { background: linear-gradient(135deg, #6b3eea, #2563eb); }
.speaker:nth-child(3n) .avatar { background: linear-gradient(135deg, #00a4ef, #0078d4); }
.speaker:nth-child(4n) .avatar { background: linear-gradient(135deg, #f25022, #c2185b); }
.speaker h4 { margin: 0 0 8px; font-size: 16px; color: var(--ink); font-weight: 700; }
.speaker-role { margin: 0 0 12px; color: var(--muted); font-size: 13px; line-height: 1.5; }
.speaker-company {
  margin: 0; color: #2f5cff; font-size: 11px; font-weight: 700;
  letter-spacing: 0.2em; text-transform: uppercase;
}

/* Venue */
.venue-address { color: var(--muted); margin: 18px 0 28px; font-size: 16px; line-height: 1.6; }
.venue-card {
  background: var(--bg); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 32px;
  display: grid; gap: 18px;
}
.section-alt .venue-card { background: var(--bg); }
.venue-detail {
  display: flex; justify-content: space-between; align-items: baseline;
  padding-bottom: 16px; border-bottom: 1px solid var(--line);
}
.venue-detail:last-child { border-bottom: none; padding-bottom: 0; }
.venue-detail span { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: 0.1em; font-weight: 600; }
.venue-detail strong { font-weight: 600; color: var(--ink); }

/* CTA */
.cta-section {
  background:
    radial-gradient(800px 400px at 50% 0%, rgba(37,99,235,0.08), transparent 60%),
    var(--surface);
  text-align: center;
}
.cta { max-width: 620px; margin: 0 auto; }
.cta h2 { margin: 0 0 16px; }
.cta p { color: var(--muted); margin: 0 0 32px; font-size: 18px; }

/* Footer */
.site-footer { padding: 36px 0; background: var(--bg); border-top: 1px solid var(--line); }
.foot { display: flex; justify-content: space-between; color: var(--muted); font-size: 14px; }

/* Agenda */
.agenda-shell {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 44px 48px 48px;
  box-shadow: 0 1px 0 rgba(15,23,42,0.02), 0 24px 60px rgba(15,23,42,0.06);
}
.agenda-shell .kicker { color: #2f5cff; letter-spacing: 0.22em; font-weight: 700; }
.agenda-title {
  font-size: clamp(32px, 4vw, 44px);
  letter-spacing: -0.03em; font-weight: 800;
  margin: 8px 0 32px; color: var(--ink);
}
.agenda-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
}
.agenda-item {
  display: grid; grid-template-columns: 130px 1fr; gap: 16px;
  align-items: start;
  padding: 22px 24px;
  background: #f6f8fc;
  border: 1px solid #eef1f6;
  border-radius: 12px;
  transition: background .15s, border-color .15s, transform .15s;
}
.agenda-item:hover { background: #eef3fb; border-color: #dde6f3; }
.agenda-item .time {
  color: #2f5cff; font-weight: 700; font-size: 15px;
  font-variant-numeric: tabular-nums; letter-spacing: -0.005em;
  padding-top: 1px;
}
.agenda-item .title {
  color: var(--ink); font-weight: 500; font-size: 16px;
  line-height: 1.5; letter-spacing: -0.005em;
}
@media (max-width: 820px) {
  .agenda-shell { padding: 28px 22px 30px; border-radius: 14px; }
  .agenda-grid { grid-template-columns: 1fr; gap: 12px; }
  .agenda-item { grid-template-columns: 100px 1fr; padding: 18px 18px; }
}

/* Tagline */
.tagline {
  font-size: clamp(20px, 2.2vw, 26px);
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.015em;
  line-height: 1.4;
  max-width: 820px;
  margin: 0 auto 36px;
}
.tagline .accent { color: #2f5cff; }

/* Value grid (Why attend + What we'll cover) */
.value-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 28px;
  align-items: stretch;
}
.value-card {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 48px 48px 44px;
  box-shadow: 0 1px 0 rgba(15,23,42,0.02), 0 18px 44px rgba(15,23,42,0.06);
  display: flex; flex-direction: column;
}
.value-card .kicker {
  color: #2f5cff; letter-spacing: 0.2em; font-weight: 700; margin-bottom: 18px;
  font-size: 12px;
}
.value-card h3 {
  font-size: clamp(26px, 2.6vw, 34px);
  letter-spacing: -0.025em; line-height: 1.15;
  margin: 0 0 26px; color: var(--ink); font-weight: 800;
}
.value-card > p {
  margin: 0 0 16px; color: var(--muted);
  font-size: 15.5px; line-height: 1.7;
}
.value-card > p:last-of-type { margin-bottom: 22px; }
.value-points {
  list-style: none; padding: 0; margin: 0 0 26px;
  display: flex; flex-direction: column; gap: 10px;
}
.value-points li {
  display: flex; align-items: center; gap: 12px;
  color: var(--ink); font-size: 15px; font-weight: 500;
}
.value-points .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: #2f5cff; flex: 0 0 7px;
  box-shadow: 0 0 0 4px rgba(37,99,235,0.12);
}
.value-tag {
  margin-top: auto;
  background: rgba(37,99,235,0.06);
  border: 1px solid rgba(37,99,235,0.18);
  border-radius: 10px;
  padding: 18px 20px;
}
.value-tag-text {
  font-size: 15px; color: var(--ink); font-weight: 600; line-height: 1.55;
}
.feature-list {
  list-style: none; padding: 0; margin: 0;
  display: flex; flex-direction: column; gap: 14px;
}
.feature-item {
  display: grid; grid-template-columns: 24px 1fr; gap: 16px;
  align-items: start;
  background: #f6f8fc;
  border: 1px solid #eef1f6;
  border-radius: 10px;
  padding: 20px 22px;
  transition: background .15s, border-color .15s;
}
.feature-item:hover { background: #eef3fb; border-color: #dde6f3; }
.feature-icon {
  width: 22px; height: 22px;
  color: #2f5cff;
  margin-top: 2px;
}
.feature-item p {
  margin: 0; color: var(--muted); font-size: 15px; line-height: 1.6;
}
@media (max-width: 900px) {
  .value-grid { grid-template-columns: 1fr; }
  .value-card { padding: 30px 26px 28px; }
}

/* Architecture diagram */
.architecture {
  margin: 56px 0 0; padding: 0;
  border-radius: 16px; overflow: hidden;
  background: linear-gradient(135deg, #0b3d3a 0%, #134e4a 40%, #2dd4bf 100%);
  box-shadow: 0 20px 60px rgba(15, 23, 42, 0.18);
}
.architecture img {
  width: 100%; height: auto; display: block;
  padding: 28px;
}
.architecture figcaption {
  color: #cbd5e1; font-size: 14px; text-align: center;
  padding: 0 24px 22px; letter-spacing: -0.005em;
}
@media (max-width: 820px) {
  .architecture img { padding: 14px; }
  .architecture figcaption { padding: 0 16px 18px; font-size: 13px; }
}

/* Responsive */
@media (max-width: 820px) {
  .nav-links { display: none; }
  .two-col { grid-template-columns: 1fr; gap: 32px; }
  .cards, .speakers { grid-template-columns: repeat(2, 1fr); }
  .agenda li { grid-template-columns: 90px 1fr; gap: 14px; }
  .agenda .dot { display: none; }
  .section { padding: 44px 0; }
  .hero { padding: 80px 0 64px; }
  .foot { flex-direction: column; gap: 8px; text-align: center; }
}
@media (max-width: 520px) {
  .cards, .speakers { grid-template-columns: 1fr; }
}