/* ==========================================================================
   GTM✕CON — Design tokens (from GTMXCON Brand Kit v1.0)
   ========================================================================== */
:root {
  /* Colour */
  --paper:        #FFFFFF;
  --mist:         #F4F6F1;
  --volt:         #C4FF3D;
  --volt-tint:    #EEFFCC;
  --volt-deep:    #3D5C00;
  --ink:          #0A0E0C;
  --graphite:     #5C6661;
  --hairline:     #E6E9E2;
  --slate:        #2B4A7E;

  /* Type */
  --font-display: "Inter Tight", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-body:    "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono:    "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  /* Space */
  --s-1: 4px;   --s-2: 8px;   --s-3: 16px;  --s-4: 24px;
  --s-5: 32px;  --s-6: 48px;  --s-7: 64px;  --s-8: 96px;
  --s-9: 128px; --s-10: 192px;

  /* Radius */
  --r-sm: 4px;  --r-btn: 8px; --r-md: 12px; --r-pill: 999px;

  /* Elevation */
  --shadow: 0 2px 8px rgba(10, 14, 12, 0.06);

  /* Motion */
  --ease: cubic-bezier(0.2, 0, 0.2, 1);
  --dur-fast: 150ms;
  --dur-base: 240ms;
  --dur-slow: 400ms;

  --max-width: 1280px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}

/* ==========================================================================
   Reset & base
   ========================================================================== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 700; margin: 0; letter-spacing: -0.02em; }
p { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }
button { font-family: inherit; cursor: pointer; }

:focus-visible {
  outline: 3px solid var(--volt-deep);
  outline-offset: 2px;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--s-7);
}
@media (max-width: 768px) {
  .container { padding: 0 var(--s-4); }
}

section { padding: var(--s-8) 0; }
@media (max-width: 768px) { section { padding: var(--s-6) 0; } }

.bg-mist { background: var(--mist); }
.bg-ink { background: var(--ink); color: var(--paper); }

/* ==========================================================================
   Type scale
   ========================================================================== */
.display-xl { font-size: 88px; line-height: 88px; letter-spacing: -0.03em; }
.display-l  { font-size: 64px; line-height: 68px; letter-spacing: -0.03em; }
.display-m  { font-size: 48px; line-height: 52px; letter-spacing: -0.02em; }
.heading-l  { font-size: 32px; line-height: 40px; letter-spacing: -0.02em; }
.heading-m  { font-size: 24px; line-height: 32px; letter-spacing: -0.01em; font-family: var(--font-display); font-weight: 600; }
.heading-s  { font-size: 20px; line-height: 28px; font-family: var(--font-body); font-weight: 600; }
.body-l { font-size: 18px; line-height: 28px; }
.body-m { font-size: 16px; line-height: 26px; }
.body-s { font-size: 14px; line-height: 22px; color: var(--graphite); }
.label {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 12px;
  line-height: 16px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.code { font-family: var(--font-mono); font-weight: 500; font-size: 14px; line-height: 22px; }

@media (max-width: 768px) {
  .display-xl { font-size: 48px; line-height: 48px; }
  .display-l  { font-size: 36px; line-height: 40px; }
  .display-m  { font-size: 32px; line-height: 38px; }
  .heading-l  { font-size: 26px; line-height: 32px; }
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  color: var(--volt-deep);
  margin-bottom: var(--s-3);
}
.eyebrow::before {
  content: "";
  width: 24px;
  height: 4px;
  background: var(--volt);
  display: inline-block;
}

.rule {
  width: 64px;
  height: 4px;
  background: var(--volt);
  border: 0;
  margin: var(--s-4) 0;
}

/* ==========================================================================
   Header / nav
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--paper);
  border-bottom: 1px solid var(--hairline);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--s-3) var(--s-7);
  max-width: var(--max-width);
  margin: 0 auto;
}
@media (max-width: 768px) { .nav { padding: var(--s-3) var(--s-4); } }

.wordmark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.03em;
  text-transform: uppercase;
  display: inline-flex;
  align-items: baseline;
}
.wordmark .x { color: var(--volt-deep); }
.wordmark small {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 11px;
  color: var(--graphite);
  letter-spacing: 0.04em;
  text-transform: none;
  margin-left: var(--s-2);
}

.nav-links {
  display: flex;
  gap: var(--s-5);
  align-items: center;
}
.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
  transition: color var(--dur-fast) var(--ease);
}
.nav-links a:hover { color: var(--volt-deep); }
.nav-links a.active { color: var(--volt-deep); }

.nav-cta { display: flex; align-items: center; gap: var(--s-4); }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  padding: var(--s-2);
}
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--ink);
  position: relative;
  transition: transform var(--dur-fast) var(--ease);
}
.nav-toggle span::before, .nav-toggle span::after { content: ""; position: absolute; }
.nav-toggle span::before { top: -7px; }
.nav-toggle span::after { top: 7px; }

@media (max-width: 860px) {
  .nav-links { position: fixed; inset: 61px 0 0 0; background: var(--paper); flex-direction: column; padding: var(--s-6) var(--s-4); gap: var(--s-5); transform: translateY(-8px); opacity: 0; pointer-events: none; transition: opacity var(--dur-base) var(--ease), transform var(--dur-base) var(--ease); }
  .nav-links.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .nav-links a { font-size: 20px; }
  .nav-toggle { display: block; }
  .nav-cta .btn-secondary { display: none; }
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--s-2);
  padding: 14px 24px;
  border-radius: var(--r-btn);
  font-weight: 600;
  font-size: 15px;
  border: 1px solid transparent;
  transition: background var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
  white-space: nowrap;
}
.btn-primary {
  background: var(--volt);
  color: var(--ink);
}
.btn-primary:hover { background: var(--ink); color: var(--volt); }
.btn-secondary {
  background: transparent;
  color: var(--ink);
  border-color: var(--ink);
}
.btn-secondary:hover { background: var(--ink); color: var(--paper); }
.btn-ink {
  background: var(--ink);
  color: var(--volt);
}
.btn-ink:hover { background: var(--volt-deep); color: var(--paper); }
.btn-sm { padding: 10px 18px; font-size: 14px; }

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  padding: var(--s-8) 0 var(--s-7);
  position: relative;
  overflow: hidden;
}
.hero-grid {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: var(--s-6);
  align-items: end;
}
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
}
.hero h1 { max-width: 11ch; }
.hero-sub { max-width: 46ch; margin-top: var(--s-4); color: var(--graphite); }
.hero-meta {
  display: flex;
  gap: var(--s-5);
  margin-top: var(--s-6);
  flex-wrap: wrap;
}
.hero-meta div { display: flex; flex-direction: column; gap: var(--s-1); }
.hero-actions { display: flex; gap: var(--s-3); margin-top: var(--s-6); flex-wrap: wrap; }

.x-motif {
  position: absolute;
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--volt-tint);
  font-size: 640px;
  line-height: 1;
  right: -140px;
  top: -160px;
  z-index: -1;
  user-select: none;
  pointer-events: none;
}
@media (max-width: 900px) { .x-motif { font-size: 340px; right: -100px; top: -60px; } }

/* ==========================================================================
   Cards / grid
   ========================================================================== */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s-5); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--s-5); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--s-4); }
@media (max-width: 860px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

.card {
  background: var(--paper);
  border: 1px solid var(--hairline);
  border-radius: var(--r-md);
  padding: var(--s-5);
  box-shadow: var(--shadow);
}
.card.on-mist { background: var(--mist); border-color: transparent; }

.pillar-card { padding: var(--s-6) var(--s-5); }
.pillar-card .label { margin-bottom: var(--s-3); }

/* placeholder speaker / avatar block */
.avatar-blank {
  aspect-ratio: 1;
  border-radius: var(--r-md);
  background: var(--mist);
  background-image: repeating-linear-gradient(135deg, var(--hairline) 0 1px, transparent 1px 12px);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--graphite);
  font-family: var(--font-mono);
  font-size: 12px;
}

/* speaker cards */
.speaker-card {
  background: var(--paper);
  border: 1px solid var(--hairline);
  border-radius: var(--r-md);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.speaker-photo {
  aspect-ratio: 1;
  width: 100%;
  object-fit: cover;
  display: block;
  background: var(--mist);
}
.speaker-body { padding: var(--s-4); }
.speaker-stage {
  display: inline-block;
  margin-bottom: var(--s-3);
}
.speaker-name { font-family: var(--font-display); font-weight: 700; font-size: 18px; letter-spacing: -0.01em; }
.speaker-role { color: var(--graphite); font-size: 14px; margin-top: 2px; }
.speaker-bio { font-size: 14px; color: var(--ink); margin-top: var(--s-3); line-height: 22px; }
.speaker-initials {
  aspect-ratio: 1;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--mist);
  background-image: repeating-linear-gradient(135deg, var(--hairline) 0 1px, transparent 1px 12px);
  color: var(--graphite);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 32px;
}

/* ==========================================================================
   Forms
   ========================================================================== */
.form-row { display: flex; gap: var(--s-3); flex-wrap: wrap; }
.field {
  flex: 1 1 220px;
  min-width: 0;
}
.field label {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--graphite);
  margin-bottom: var(--s-2);
}
.field input, .field select, .field textarea {
  width: 100%;
  padding: 13px var(--s-3);
  border: 1px solid var(--hairline);
  border-radius: var(--r-sm);
  font-family: var(--font-body);
  font-size: 16px;
  background: var(--paper);
  color: var(--ink);
}
.field input:focus, .field select:focus, .field textarea:focus {
  border-color: var(--volt-deep);
  outline: none;
}
.honeypot { position: absolute; left: -9999px; opacity: 0; }

.form-success {
  display: none;
  background: var(--volt-tint);
  border-radius: var(--r-md);
  padding: var(--s-4);
  color: var(--volt-deep);
  font-weight: 600;
}
.form-success.show { display: block; }

/* ==========================================================================
   Table
   ========================================================================== */
table { width: 100%; border-collapse: collapse; }
th, td {
  text-align: left;
  padding: var(--s-3) var(--s-3);
  border-bottom: 1px solid var(--hairline);
}
th { font-family: var(--font-mono); font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--graphite); font-weight: 500; }
td.num { font-family: var(--font-mono); font-size: 15px; }

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  border-top: 1px solid var(--hairline);
  padding: var(--s-7) 0 var(--s-5);
}
.footer-grid {
  display: flex;
  justify-content: space-between;
  gap: var(--s-6);
  flex-wrap: wrap;
}
.footer-cols { display: flex; gap: var(--s-8); flex-wrap: wrap; }
.footer-col h4 { font-family: var(--font-mono); font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--graphite); margin-bottom: var(--s-3); font-weight: 500; }
.footer-col ul li { margin-bottom: var(--s-2); }
.footer-col a:hover { color: var(--volt-deep); }
.footer-bottom {
  margin-top: var(--s-7);
  padding-top: var(--s-4);
  border-top: 1px solid var(--hairline);
  display: flex;
  justify-content: space-between;
  color: var(--graphite);
  font-size: 13px;
  flex-wrap: wrap;
  gap: var(--s-2);
}

/* ==========================================================================
   Utility
   ========================================================================== */
.mt-2 { margin-top: var(--s-2); }
.mt-3 { margin-top: var(--s-3); }
.mt-4 { margin-top: var(--s-4); }
.mt-5 { margin-top: var(--s-5); }
.mt-6 { margin-top: var(--s-6); }
.mt-8 { margin-top: var(--s-8); }
.mb-4 { margin-bottom: var(--s-4); }
.mb-5 { margin-bottom: var(--s-5); }
.text-center { text-align: center; }
.max-60 { max-width: 60ch; }
.max-60.center { margin-left: auto; margin-right: auto; }

.pill {
  display: inline-block;
  padding: var(--s-1) var(--s-3);
  border-radius: var(--r-pill);
  background: var(--volt-tint);
  color: var(--volt-deep);
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.fade-up {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity var(--dur-slow) var(--ease), transform var(--dur-slow) var(--ease);
}
.fade-up.in { opacity: 1; transform: translateY(0); }

.ink-panel {
  background: var(--ink);
  color: var(--paper);
  border-radius: var(--r-md);
  padding: var(--s-8) var(--s-6);
  text-align: center;
}
.ink-panel .rule { margin-left: auto; margin-right: auto; }