/* =========================================================
   APPXADS — DESIGN TOKENS
   ========================================================= */
:root {
  /* Color */
  --bg: #0A0E1A;
  --bg-elevated: #0E1326;
  --bg-card: #121834;
  --border: #232B4A;
  --border-soft: rgba(91, 140, 255, 0.18);

  --text-primary: #F4F6FC;
  --text-secondary: #99A2C3;
  --text-tertiary: #5D6690;

  --demand: #5B8CFF;   /* advertiser / demand side */
  --demand-soft: rgba(91, 140, 255, 0.12);
  --supply: #00D9B5;   /* publisher / supply side */
  --supply-soft: rgba(0, 217, 181, 0.12);
  --warm: #FF6B4A;

  --grad-signal: linear-gradient(135deg, var(--demand), var(--supply));

  /* Type */
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'IBM Plex Sans', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;

  /* Layout */
  --container-w: 1240px;
  --section-pad: 128px;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
}

@media (max-width: 900px) {
  :root { --section-pad: 80px; }
}
@media (max-width: 600px) {
  :root { --section-pad: 64px; }
}

/* =========================================================
   RESET
   ========================================================= */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; margin: 0; padding: 0; }
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 600; margin: 0; line-height: 1.15; }
p { margin: 0; }
button { font-family: inherit; cursor: pointer; }

/* Background: faint data-grid texture across the whole page */
body {
  background-image:
    linear-gradient(rgba(91,140,255,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(91,140,255,0.05) 1px, transparent 1px);
  background-size: 56px 56px;
  background-position: center top;
}

/* Focus visibility */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible, select:focus-visible {
  outline: 2px solid var(--demand);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--bg-card);
  color: var(--text-primary);
  padding: 12px 20px;
  z-index: 1000;
  border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

.container {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 32px;
}
@media (max-width: 600px) {
  .container { padding: 0 20px; }
}

/* =========================================================
   REVEAL ON SCROLL
   ========================================================= */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* =========================================================
   UTILITIES — BUTTONS / EYEBROW
   ========================================================= */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--supply);
  margin: 0 0 14px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 15px;
  border: 1px solid transparent;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, border-color 0.2s ease;
  white-space: nowrap;
}
.btn--primary {
  background: var(--grad-signal);
  color: #06101F;
}
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 10px 30px -10px rgba(91,140,255,0.55); }

.btn--ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--text-primary);
}
.btn--ghost.btn--supply:hover {
  border-color: var(--supply);
  color: var(--supply);
  transform: translateY(-2px);
}

.btn--sm { padding: 10px 20px; font-size: 14px; }

/* =========================================================
   NAVIGATION
   ========================================================= */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 14, 26, 0.72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.nav__inner {
  display: flex;
  align-items: center;
  gap: 32px;
  height: 76px;
}
.nav__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  margin-right: auto;
}
.logo-x {
  background: var(--grad-signal);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.nav__links {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 14.5px;
  font-weight: 500;
  color: var(--text-secondary);
}
.nav__links a { transition: color 0.2s ease; }
.nav__links a:hover { color: var(--text-primary); }

.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  padding: 0;
}
.nav__toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}
.nav__toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav__toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-menu {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 12px 20px 24px;
  border-top: 1px solid var(--border);
  background: var(--bg-elevated);
}
.mobile-menu.is-open { display: flex; }
.mobile-menu a {
  padding: 14px 8px;
  font-size: 15px;
  font-weight: 500;
  border-bottom: 1px solid var(--border);
  color: var(--text-secondary);
}
.mobile-menu .btn { margin-top: 12px; align-self: flex-start; }

@media (max-width: 900px) {
  .nav__links { display: none; }
  .nav__cta { display: none; }
  .nav__toggle { display: flex; }
}

/* =========================================================
   HERO
   ========================================================= */
.hero {
  padding: 72px 0 var(--section-pad);
  overflow: hidden;
}
.hero__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.hero__title {
  font-size: clamp(2.4rem, 4.4vw, 3.6rem);
  letter-spacing: -0.01em;
  margin: 0 0 22px;
}
.hero__subtitle {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 46ch;
  margin-bottom: 34px;
}
.hero__ctas {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}
.hero__stats { display: flex; }
.stat-chip {
  display: flex;
  gap: 8px;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-tertiary);
  border: 1px solid var(--border);
  padding: 8px 16px;
  border-radius: 999px;
}
.stat-chip span:nth-child(1), .stat-chip span:nth-child(3), .stat-chip span:nth-child(5) { color: var(--text-secondary); }
.stat-chip span:nth-child(2), .stat-chip span:nth-child(4) { color: var(--supply); }

.hero__visual { position: relative; }
.exchange-diagram { width: 100%; height: auto; }

.node circle, .node rect { fill: var(--bg-card); stroke: var(--border); stroke-width: 1.5; }
.node text { font-family: var(--font-mono); font-size: 15px; fill: var(--text-secondary); }
.node--pub circle { stroke: var(--supply); }
.node--adv circle { stroke: var(--demand); }
.node--hub rect { fill: var(--bg-elevated); stroke: url(#navGrad); stroke-width: 2; }
.node--hub path { stroke: var(--text-primary); }
.node-label { font-family: var(--font-mono); font-size: 13px; fill: var(--text-tertiary); letter-spacing: 0.04em; }

.flow-path { fill: none; stroke-width: 1.5; stroke-dasharray: 4 6; opacity: 0.55; }
.flow-path--supply { stroke: var(--supply); }
.flow-path--demand { stroke: var(--demand); }
.flow-dot { filter: drop-shadow(0 0 4px currentColor); }
.flow-dot--supply { fill: var(--supply); color: var(--supply); }
.flow-dot--demand { fill: var(--demand); color: var(--demand); }

@media (max-width: 900px) {
  .hero__inner { grid-template-columns: 1fr; }
  .hero__visual { order: -1; }
}

/* =========================================================
   MARQUEE
   ========================================================= */
.marquee-section {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--bg-elevated);
  padding: 28px 0;
}
.marquee { display: flex; align-items: center; gap: 32px; }
.marquee__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  white-space: nowrap;
  flex-shrink: 0;
  padding: 0;
  margin: 0 0 0 32px;
}
.marquee__track {
  display: flex;
  overflow: hidden;
  flex: 1;
  mask-image: linear-gradient(90deg, transparent, black 8%, black 92%, transparent);
}
.marquee__group {
  display: flex;
  gap: 40px;
  flex-shrink: 0;
  animation: marquee 28s linear infinite;
  padding-right: 40px;
}
.marquee__group span {
  font-size: 14.5px;
  color: var(--text-secondary);
  white-space: nowrap;
}
@keyframes marquee {
  from { transform: translateX(0); }
  to { transform: translateX(-100%); }
}

/* =========================================================
   SECTION SHELL
   ========================================================= */
.section { padding: var(--section-pad) 0; }
.section--elevated { background: var(--bg-elevated); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section__header { max-width: 640px; margin-bottom: 56px; }
.section__title { font-size: clamp(1.8rem, 3vw, 2.4rem); margin-bottom: 14px; }
.section__desc { color: var(--text-secondary); font-size: 16px; }

/* =========================================================
   SERVICES — BENTO GRID
   ========================================================= */
.services__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.service-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 32px;
  transition: transform 0.25s ease, border-color 0.25s ease;
}
.service-card:hover { transform: translateY(-4px); border-color: var(--border-soft); }
.service-card--large { grid-column: span 2; }
.service-card__icon {
  width: 44px; height: 44px;
  border-radius: 12px;
  background: var(--demand-soft);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 20px;
}
.service-card__icon svg { width: 22px; height: 22px; fill: none; stroke: var(--demand); stroke-width: 1.6; }
.service-card h3 { font-size: 19px; margin-bottom: 10px; }
.service-card p { color: var(--text-secondary); font-size: 15px; }

@media (max-width: 900px) {
  .services__grid { grid-template-columns: 1fr 1fr; }
  .service-card--large { grid-column: span 2; }
}
@media (max-width: 600px) {
  .services__grid { grid-template-columns: 1fr; }
  .service-card--large { grid-column: span 1; }
}

/* =========================================================
   SPLIT — ADVERTISERS / PUBLISHERS
   ========================================================= */
.split { padding: var(--section-pad) 0; background: var(--bg-elevated); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.split__grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 48px;
  align-items: start;
}
.split__divider { width: 1px; background: var(--border); align-self: stretch; }
.split__tag { font-family: var(--font-mono); font-size: 13px; letter-spacing: 0.06em; text-transform: uppercase; margin-bottom: 10px; }
.split__col--demand .split__tag { color: var(--demand); }
.split__col--supply .split__tag { color: var(--supply); }
.split__col h3 { font-size: 26px; margin-bottom: 16px; }
.split__col > p { color: var(--text-secondary); margin-bottom: 24px; }
.split__list { margin-bottom: 28px; }
.split__list li {
  position: relative;
  padding-left: 24px;
  margin-bottom: 12px;
  font-size: 15px;
  color: var(--text-primary);
}
.split__col--demand .split__list li::before { content: ""; position: absolute; left: 0; top: 8px; width: 8px; height: 8px; border-radius: 2px; background: var(--demand); }
.split__col--supply .split__list li::before { content: ""; position: absolute; left: 0; top: 8px; width: 8px; height: 8px; border-radius: 2px; background: var(--supply); }

@media (max-width: 900px) {
  .split__grid { grid-template-columns: 1fr; }
  .split__divider { display: none; }
}

/* =========================================================
   PROCESS
   ========================================================= */
.process__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.process-step {
  border-top: 2px solid var(--border-soft);
  padding-top: 20px;
}
.process-step__num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--supply);
  display: block;
  margin-bottom: 14px;
}
.process-step h3 { font-size: 18px; margin-bottom: 10px; }
.process-step p { color: var(--text-secondary); font-size: 14.5px; }

@media (max-width: 900px) {
  .process__grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  .process__grid { grid-template-columns: 1fr; }
}

/* =========================================================
   WHY US
   ========================================================= */
.why__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.why-card {
  background: var(--bg-elevated);
  padding: 32px;
}
.why-card h3 { font-size: 17px; margin-bottom: 10px; }
.why-card p { color: var(--text-secondary); font-size: 14.5px; }

@media (max-width: 900px) {
  .why__grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  .why__grid { grid-template-columns: 1fr; }
}

/* =========================================================
   VERTICALS
   ========================================================= */
.verticals__grid {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.vertical-chip {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  padding: 10px 18px;
  border-radius: 999px;
  transition: border-color 0.2s ease, color 0.2s ease;
}
.vertical-chip:hover { border-color: var(--supply); color: var(--text-primary); }

/* =========================================================
   STATS BAND
   ========================================================= */
.stats-band {
  padding: 72px 0;
  background: linear-gradient(180deg, var(--bg-elevated), var(--bg));
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.stats-band__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}
.stat-block__value {
  display: block;
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 700;
  background: var(--grad-signal);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 10px;
}
.stat-block__label { color: var(--text-secondary); font-size: 14px; line-height: 1.5; }

@media (max-width: 900px) {
  .stats-band__grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  .stats-band__grid { grid-template-columns: 1fr; }
}

/* =========================================================
   CASE STUDIES (placeholder)
   ========================================================= */
.cases__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.case-card--empty {
  border: 1px dashed var(--border);
  border-radius: var(--radius-md);
  padding: 32px;
  text-align: left;
}
.case-card__plus {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px; height: 36px;
  border-radius: 10px;
  background: var(--demand-soft);
  color: var(--demand);
  font-size: 20px;
  margin-bottom: 18px;
}
.case-card--empty h3 { font-size: 17px; margin-bottom: 8px; color: var(--text-primary); }
.case-card--empty p { color: var(--text-tertiary); font-size: 14px; }

@media (max-width: 900px) {
  .cases__grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  .cases__grid { grid-template-columns: 1fr; }
}

/* =========================================================
   CTA BAND
   ========================================================= */
.cta-band {
  padding: var(--section-pad) 0;
  text-align: center;
  background: radial-gradient(ellipse at center, rgba(91,140,255,0.1), transparent 65%);
}
.cta-band__inner { max-width: 640px; margin: 0 auto; }
.cta-band h2 { font-size: clamp(1.8rem, 3.4vw, 2.4rem); margin-bottom: 16px; }
.cta-band p { color: var(--text-secondary); margin-bottom: 32px; }
.cta-band__ctas { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* =========================================================
   CONTACT
   ========================================================= */
.contact__grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 64px;
}
.contact__details { margin: 28px 0; }
.contact__details li { display: flex; flex-direction: column; gap: 4px; margin-bottom: 20px; }
.contact__label { font-family: var(--font-mono); font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-tertiary); }
.contact__details a:hover { color: var(--supply); }

.contact__social { display: flex; gap: 12px; }
.social-icon {
  width: 40px; height: 40px;
  border: 1px solid var(--border);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-secondary);
  transition: border-color 0.2s ease, color 0.2s ease;
}
.social-icon svg { width: 18px; height: 18px; fill: currentColor; }
.social-icon:hover { border-color: var(--supply); color: var(--supply); }

.contact__form {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 36px;
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.form-field { margin-bottom: 20px; display: flex; flex-direction: column; gap: 8px; }
.form-field label { font-size: 13px; color: var(--text-secondary); }
.form-field input, .form-field select, .form-field textarea {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 15px;
  resize: vertical;
}
.form-field input:focus, .form-field select:focus, .form-field textarea:focus {
  border-color: var(--demand);
}
.form-submit { width: 100%; }
.form-status { margin-top: 14px; font-size: 14px; color: var(--supply); min-height: 1.2em; }

@media (max-width: 900px) {
  .contact__grid { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .form-row { grid-template-columns: 1fr; }
}

/* =========================================================
   FOOTER
   ========================================================= */
.footer { border-top: 1px solid var(--border); padding: 72px 0 32px; background: var(--bg-elevated); }
.footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
}
.footer__col--brand p { color: var(--text-tertiary); font-size: 14px; margin-top: 16px; max-width: 32ch; }
.footer__col h4 { font-size: 14px; color: var(--text-primary); margin-bottom: 18px; }
.footer__col a { display: block; color: var(--text-secondary); font-size: 14.5px; margin-bottom: 12px; transition: color 0.2s ease; }
.footer__col a:hover { color: var(--supply); }

.footer__bottom {
  display: flex;
  justify-content: space-between;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  color: var(--text-tertiary);
  font-size: 13px;
}

@media (max-width: 900px) {
  .footer__grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  .footer__grid { grid-template-columns: 1fr; }
  .footer__bottom { flex-direction: column; gap: 8px; }
}

/* =========================================================
   REDUCED MOTION
   ========================================================= */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { transition: none; opacity: 1; transform: none; }
  .marquee__group { animation: none; }
  .flow-dot, .flow-path { display: none; }
}