/*
  Atop Clouds Limited — static landing page styles
  Focus: readable, modern, accessible, responsive.
*/

:root {
  color-scheme: dark;

  --bg: #070b12;
  --bg2: #0b1220;
  --card: rgba(255, 255, 255, 0.06);
  --card2: rgba(255, 255, 255, 0.08);
  --border: rgba(255, 255, 255, 0.12);
  --text: rgba(255, 255, 255, 0.92);
  --muted: rgba(255, 255, 255, 0.7);
  --faint: rgba(255, 255, 255, 0.55);

  --primary: #7c3aed;
  --primary2: #22c55e;
  --warn: #f59e0b;

  --shadow: 0 20px 60px rgba(0, 0, 0, 0.55);
  --radius: 18px;
  --radius2: 26px;

  --container: 1120px;
  --gap: 18px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family: Inter, "Noto Sans SC", system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  line-height: 1.6;
  color: var(--text);
  background:
    radial-gradient(1100px 700px at 10% 10%, rgba(124, 58, 237, 0.18), transparent 55%),
    radial-gradient(900px 600px at 88% 16%, rgba(34, 197, 94, 0.15), transparent 55%),
    radial-gradient(900px 650px at 50% 90%, rgba(14, 165, 233, 0.10), transparent 55%),
    linear-gradient(180deg, var(--bg), var(--bg2));
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: min(var(--container), calc(100% - 48px));
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 12px;
  background: #111827;
  border: 1px solid var(--border);
  padding: 10px 12px;
  border-radius: 10px;
  z-index: 50;
}

.skip-link:focus {
  left: 12px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  background: rgba(7, 11, 18, 0.6);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
  gap: 16px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 220px;
}

.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 12px;
  background:
    radial-gradient(12px 12px at 25% 30%, rgba(255, 255, 255, 0.75), transparent 55%),
    linear-gradient(135deg, rgba(124, 58, 237, 0.95), rgba(34, 197, 94, 0.85));
  box-shadow: 0 14px 30px rgba(124, 58, 237, 0.25);
}

.brand-text {
  display: grid;
  line-height: 1.05;
}

.brand-name {
  font-weight: 700;
  letter-spacing: 0.2px;
}

.brand-sub {
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.3px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-link {
  padding: 8px 12px;
  border-radius: 12px;
  color: var(--muted);
  transition: background 160ms ease, color 160ms ease;
}

.nav-link:hover,
.nav-link:focus-visible {
  background: rgba(255, 255, 255, 0.07);
  color: var(--text);
  outline: none;
}

.nav-cta {
  background: rgba(124, 58, 237, 0.18);
  border: 1px solid rgba(124, 58, 237, 0.35);
  color: rgba(255, 255, 255, 0.92);
}

.nav-cta:hover,
.nav-cta:focus-visible {
  background: rgba(124, 58, 237, 0.26);
}

.hero {
  padding: 56px 0 26px;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.08fr 0.92fr;
  gap: 26px;
  align-items: start;
}

.kicker {
  margin: 0 0 10px;
  font-weight: 600;
  letter-spacing: 0.5px;
  color: rgba(255, 255, 255, 0.74);
}

.hero-title {
  margin: 0 0 12px;
  font-size: clamp(30px, 3.5vw, 52px);
  letter-spacing: -0.6px;
  line-height: 1.12;
}

.hero-desc {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 16px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin: 6px 0 18px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 44px;
  padding: 0 16px;
  border-radius: 14px;
  font-weight: 600;
  border: 1px solid transparent;
  transition: transform 120ms ease, background 160ms ease, border-color 160ms ease;
  user-select: none;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.95), rgba(34, 197, 94, 0.88));
  box-shadow: 0 18px 36px rgba(124, 58, 237, 0.18);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: linear-gradient(135deg, rgba(124, 58, 237, 1), rgba(34, 197, 94, 0.95));
  outline: none;
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.12);
  color: rgba(255, 255, 255, 0.9);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  background: rgba(255, 255, 255, 0.09);
  outline: none;
}

.btn-block {
  width: 100%;
}

.hero-metrics {
  margin: 0;
  padding: 14px 0 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.metric {
  padding: 10px 12px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.metric dt {
  font-size: 12px;
  color: var(--faint);
  letter-spacing: 0.4px;
}

.metric dd {
  margin: 2px 0 0;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.92);
}

.hero-card {
  border-radius: var(--radius2);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.03));
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.card-grid {
  display: grid;
  grid-template-columns: 1fr;
}

.card {
  padding: 18px 18px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.card:last-child {
  border-bottom: none;
}

.card-title {
  margin: 0 0 6px;
  font-size: 18px;
  letter-spacing: -0.2px;
}

.card-desc {
  margin: 0 0 10px;
  color: var(--muted);
}

.card-list {
  margin: 0;
  padding: 0 0 0 18px;
  color: rgba(255, 255, 255, 0.84);
}

.card-list li {
  margin: 6px 0;
}

.hero-note {
  padding: 14px 18px 16px;
  background: rgba(0, 0, 0, 0.22);
}

.hero-note p {
  margin: 0;
  color: var(--muted);
}

.section {
  padding: 52px 0;
}

.section-alt {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0.01));
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.section-head {
  max-width: 760px;
}

.section-title {
  margin: 0 0 10px;
  font-size: clamp(22px, 2.2vw, 34px);
  letter-spacing: -0.4px;
  line-height: 1.2;
}

.section-desc {
  margin: 0;
  color: var(--muted);
}

.tiles {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--gap);
  margin-top: 22px;
}

.tile {
  padding: 18px 18px 16px;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.10);
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.24);
}

.tile-title {
  margin: 0 0 8px;
  font-size: 18px;
}

.tile-desc {
  margin: 0 0 10px;
  color: var(--muted);
}

.tile-meta {
  margin: 0;
  font-size: 12px;
  color: var(--faint);
  letter-spacing: 0.2px;
}

.steps {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--gap);
}

.step {
  padding: 18px 18px 16px;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.10);
}

.step-title {
  margin: 0 0 8px;
  font-size: 16px;
}

.step-desc {
  margin: 0;
  color: var(--muted);
}

.about-grid {
  margin-top: 22px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap);
}

.about-card {
  padding: 18px 18px 16px;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.10);
}

.about-title {
  margin: 0 0 10px;
  font-size: 18px;
}

.about-desc {
  margin: 0;
  color: var(--muted);
}

.about-list {
  margin: 0;
  padding: 0 0 0 18px;
  color: rgba(255, 255, 255, 0.84);
}

.about-list li {
  margin: 8px 0;
}

.section-contact {
  padding-bottom: 64px;
}

.contact-inner {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 26px;
  align-items: start;
}

.contact-card {
  border-radius: var(--radius2);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: var(--shadow);
  padding: 18px;
}

.contact-row {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.contact-row:last-of-type {
  border-bottom: none;
}

.contact-label {
  color: var(--faint);
  font-size: 13px;
}

.contact-value {
  color: rgba(255, 255, 255, 0.92);
  font-weight: 600;
}

.link {
  color: rgba(255, 255, 255, 0.92);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(255, 255, 255, 0.30);
}

.link:hover,
.link:focus-visible {
  text-decoration-color: rgba(255, 255, 255, 0.65);
  outline: none;
}

.contact-actions {
  margin-top: 14px;
}

.contact-footnote {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.site-footer {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(0, 0, 0, 0.18);
  padding: 22px 0 18px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.footer-brand {
  font-weight: 700;
}

.footer-meta {
  color: var(--muted);
  font-size: 13px;
}

.footer-right {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  color: var(--muted);
}

.footer-bottom {
  margin-top: 14px;
  color: var(--faint);
  font-size: 12px;
}

@media (max-width: 980px) {
  .hero-inner,
  .contact-inner {
    grid-template-columns: 1fr;
  }

  .tiles {
    grid-template-columns: 1fr;
  }

  .steps {
    grid-template-columns: 1fr 1fr;
  }

  .about-grid {
    grid-template-columns: 1fr;
  }

  .brand {
    min-width: auto;
  }

  .nav {
    gap: 2px;
  }
}

@media (max-width: 560px) {
  .nav {
    display: none;
  }

  .hero {
    padding-top: 40px;
  }

  .steps {
    grid-template-columns: 1fr;
  }

  .hero-metrics {
    grid-template-columns: 1fr;
  }
}

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