:root {
  --bg: #0d1117;
  --bg-elev: #161b22;
  --bg-elev-2: #1c2128;
  --border: #30363d;
  --border-muted: #21262d;
  --text: #e6edf3;
  --text-muted: #8d96a0;
  --accent: #2f81f7;
  --accent-grad-1: #a371f7;
  --accent-grad-2: #2f81f7;
  --accent-grad-3: #3fb950;
  --success: #3fb950;
  --warn: #d29922;
  --danger: #f85149;
  --radius: 10px;
  --shadow: 0 8px 24px rgba(1, 4, 9, 0.6);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background:
    radial-gradient(1200px 600px at 80% -200px, rgba(163, 113, 247, 0.15), transparent 60%),
    radial-gradient(900px 500px at -10% 10%, rgba(47, 129, 247, 0.12), transparent 60%),
    var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

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

.container {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header + co-brand */
.site-header {
  border-bottom: 1px solid var(--border-muted);
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: saturate(140%) blur(8px);
  position: sticky;
  top: 0;
  z-index: 10;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand { display: inline-flex; align-items: center; color: var(--text); }
.brand:hover { text-decoration: none; }
.cobrand { display: inline-flex; align-items: center; gap: 12px; }
.gh-mark { color: var(--text); }
.cobrand-x { color: var(--text-muted); font-size: 18px; line-height: 1; }
.eficode-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: #fff;
  border-radius: 8px;
  padding: 4px 8px;
  height: 34px;
}
.eficode-chip img { display: block; }
.external { color: var(--text-muted); font-size: 14px; }

/* Hero */
.hero { padding: 56px 0 24px; }
.eyebrow {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  margin-bottom: 18px;
}
h1 {
  font-size: clamp(28px, 4.4vw, 44px);
  line-height: 1.15;
  margin: 0 0 14px;
  letter-spacing: -0.02em;
  font-weight: 700;
}
.grad {
  background: linear-gradient(90deg, var(--accent-grad-1), var(--accent-grad-2) 50%, var(--accent-grad-3));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.lede {
  font-size: 18px;
  color: var(--text-muted);
  max-width: 70ch;
  margin: 0 0 24px;
}

/* Meta row */
.meta-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin: 0 0 22px;
}
.meta-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elev);
}
.meta-k { font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-muted); }
.meta-v { font-size: 14px; color: var(--text); font-weight: 600; }
@media (max-width: 720px) { .meta-row { grid-template-columns: 1fr 1fr; } }

.cta-inline { margin: 4px 0 28px; }
.btn-lg { padding: 12px 26px !important; font-size: 16px !important; }

.callouts { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-bottom: 8px; }
@media (max-width: 640px) { .callouts { grid-template-columns: 1fr; } }
.callout {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elev);
}
.callout strong { color: var(--text); }
.callout span { color: var(--text-muted); }
.callout.info { border-left: 3px solid var(--accent); }
.callout.warn { border-left: 3px solid var(--warn); }

/* Section headings */
section > h2 { font-size: 24px; margin: 40px 0 16px; letter-spacing: -0.01em; }

/* Outcomes */
.outcome-grid {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
@media (max-width: 640px) { .outcome-grid { grid-template-columns: 1fr; } }
.outcome-grid li {
  position: relative;
  padding: 14px 16px 14px 40px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elev);
  color: var(--text-muted);
  font-size: 15px;
}
.outcome-grid li strong { color: var(--text); }
.outcome-grid li::before {
  content: "✓";
  position: absolute;
  left: 14px;
  top: 13px;
  color: var(--success);
  font-weight: 700;
}

/* Agenda timeline */
.timeline { list-style: none; padding: 0; margin: 0; counter-reset: step; }
.timeline li {
  display: grid;
  grid-template-columns: 84px 1fr;
  gap: 16px;
  align-items: start;
  padding: 16px 0;
  border-bottom: 1px solid var(--border-muted);
}
.timeline li:last-child { border-bottom: none; }
.t-dur {
  font-size: 12px;
  font-weight: 700;
  color: var(--accent);
  background: rgba(47, 129, 247, 0.12);
  border: 1px solid rgba(47, 129, 247, 0.35);
  border-radius: 999px;
  padding: 4px 0;
  text-align: center;
}
.t-body { display: flex; flex-direction: column; gap: 3px; }
.t-body strong { color: var(--text); font-size: 16px; }
.t-body span { color: var(--text-muted); font-size: 14px; }

/* Speakers */
.speaker-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 640px) { .speaker-grid { grid-template-columns: 1fr; } }
.speaker {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elev);
}
.avatar {
  flex: 0 0 auto;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 18px;
  color: #fff;
  background: linear-gradient(135deg, var(--accent-grad-1), var(--accent-grad-2));
  letter-spacing: 0.02em;
}
.speaker-body { display: flex; flex-direction: column; }
.speaker-body strong { color: var(--text); font-size: 16px; }
.speaker-org { color: var(--text-muted); font-size: 14px; }

/* Card / form */
.card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  margin: 40px 0;
  scroll-margin-top: 84px;
}
.card-title { font-size: 22px; margin: 0 0 6px; }
.card-sub { color: var(--text-muted); margin: 0 0 20px; }
.group-title {
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin: 4px 0 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-muted);
}
.group-title + .grid { margin-bottom: 4px; }
.agenda + .speakers h2 { margin-top: 40px; }

form .grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-bottom: 18px;
}
@media (max-width: 640px) {
  form .grid { grid-template-columns: 1fr; }
  .card { padding: 20px; }
}

.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 18px; }
.field:last-of-type { margin-bottom: 0; }
.grid .field { margin-bottom: 0; }

label { font-size: 14px; font-weight: 600; color: var(--text); }
.req { color: var(--danger); margin-left: 2px; }
.hint { color: var(--text-muted); font-size: 12px; }
.hint-inline { color: var(--text-muted); font-size: 12px; font-weight: 400; }

input[type="text"],
input[type="email"],
select,
textarea {
  width: 100%;
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 10px 12px;
  font: inherit;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
select { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 16 16'%3E%3Cpath fill='%238d96a0' d='M4.427 6.427 8 10l3.573-3.573A.25.25 0 0 0 11.396 6H4.604a.25.25 0 0 0-.177.427Z'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 12px center; padding-right: 34px; }
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(47, 129, 247, 0.35);
}

.radio-row, .check-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 4px; }
.radio, .chip-check {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  font-weight: 500;
  font-size: 14px;
}
.radio input, .chip-check input { accent-color: var(--accent); }
.radio:hover, .chip-check:hover { border-color: var(--accent); }

.checkbox .check {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px;
  align-items: start;
  font-weight: 400;
  color: var(--text-muted);
  background: var(--bg-elev-2);
  padding: 14px 16px;
  border-radius: 8px;
  border: 1px solid var(--border);
}
.checkbox input { margin-top: 4px; accent-color: var(--accent); }
.checkbox strong { color: var(--text); }

.actions { display: flex; align-items: center; gap: 16px; margin-top: 24px; flex-wrap: wrap; }

.btn-primary {
  appearance: none;
  border: 1px solid rgba(240, 246, 252, 0.1);
  background: linear-gradient(180deg, #2ea043, #2c974b);
  color: #fff;
  padding: 10px 20px;
  font-weight: 600;
  border-radius: 8px;
  cursor: pointer;
  font-size: 15px;
  transition: filter 0.15s ease, transform 0.05s ease;
  display: inline-block;
}
.btn-primary:hover { filter: brightness(1.08); text-decoration: none; }
.btn-primary:active { transform: translateY(1px); }
.btn-primary:disabled { opacity: 0.65; cursor: not-allowed; }

.form-message { font-size: 14px; }
.form-message.success { color: var(--success); }
.form-message.error { color: var(--danger); }

/* FAQ */
.faq h2 { font-size: 22px; margin: 40px 0 12px; letter-spacing: -0.01em; }
details {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 16px;
  background: var(--bg-elev);
  margin-bottom: 10px;
}
summary { cursor: pointer; font-weight: 600; color: var(--text); }
details[open] summary { margin-bottom: 8px; }
details p { color: var(--text-muted); margin: 0; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border-muted);
  margin-top: 48px;
  padding: 20px 0;
  color: var(--text-muted);
  font-size: 13px;
}
.footer-inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 8px; }
.footer-links { display: inline-flex; gap: 16px; }