/* ===== Design tokens ===== */
:root {
  --bg: #f5f7fb;
  --bg-elev: #ffffff;
  --fg: #0b1d33;
  --fg-mute: #4a5c75;
  --border: #e3e8f0;
  --brand: #1f6feb;
  --brand-2: #16b1a4;
  --accent: #f59e0b;
  --danger: #e5484d;
  --shadow: 0 10px 30px rgba(11, 29, 51, 0.08);
  --radius: 14px;
  --radius-lg: 22px;
  --maxw: 1180px;
  --ease: cubic-bezier(.2, .7, .2, 1);
  --nav-h: 68px;
}

[data-theme="dark"] {
  --bg: #0a1424;
  --bg-elev: #10203a;
  --fg: #e8eefc;
  --fg-mute: #a6b4cc;
  --border: #1e3050;
  --brand: #6aa1ff;
  --brand-2: #2fd4c2;
  --accent: #ffb44a;
  --shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ===== Base ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-h);
}
body {
  margin: 0;
  font-family: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3 {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin: 0 0 0.5rem;
}
p { margin: 0 0 0.75rem; color: var(--fg-mute); }
a { color: inherit; }
img { max-width: 100%; display: block; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--brand);
  color: white;
  padding: 0.5rem 0.75rem;
  z-index: 1000;
}
.skip-link:focus { left: 8px; top: 8px; }

/* ===== Header / Nav ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 900;
  background: color-mix(in oklab, var(--bg-elev) 82%, transparent);
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}
.site-header.scrolled { border-bottom-color: var(--border); }

.nav-wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 1.25rem;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--fg);
  font-weight: 800;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.35rem;
  letter-spacing: 0.01em;
}
.brand-mark {
  width: 28px; height: 28px; border-radius: 8px;
  background:
    radial-gradient(900px 500px at 80% 90%, rgba(22,177,164,0.25), transparent 60%),
    url('./img/Logo.png') center/cover no-repeat;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.15), 0 4px 12px rgba(31,111,235,0.35);
}

.primary-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}
.primary-nav ul {
  display: flex;
  gap: 0.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.primary-nav a {
  position: relative;
  display: inline-block;
  padding: 0.55rem 0.85rem;
  color: var(--fg-mute);
  text-decoration: none;
  font-size: 0.95rem;
  border-radius: 8px;
  transition: color 0.25s var(--ease), background 0.25s var(--ease);
}
.primary-nav a:hover { color: var(--fg); background: color-mix(in oklab, var(--fg) 6%, transparent); }
.primary-nav a.active { color: var(--fg); }
.primary-nav a.active::after {
  content: "";
  position: absolute;
  left: 0.85rem;
  right: 0.85rem;
  bottom: 0.25rem;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--brand), var(--brand-2));
  animation: nav-underline 0.35s var(--ease);
}
@keyframes nav-underline {
  from { transform: scaleX(0); transform-origin: left; }
  to { transform: scaleX(1); transform-origin: left; }
}

.theme-toggle {
  margin-left: 0.5rem;
  background: transparent;
  color: var(--fg-mute);
  border: 1px solid var(--border);
  width: 38px; height: 38px;
  border-radius: 10px;
  display: inline-flex; align-items: center; justify-content: center;
  cursor: pointer;
  transition: transform 0.25s var(--ease), color 0.25s var(--ease), border-color 0.25s var(--ease);
}
.theme-toggle:hover { color: var(--fg); transform: rotate(-12deg); border-color: var(--brand); }

.nav-toggle {
  display: none;
  margin-left: auto;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 10px;
  width: 42px; height: 42px;
  padding: 0;
  cursor: pointer;
}
.nav-toggle span {
  display: block; height: 2px; width: 20px;
  background: var(--fg); margin: 4px auto;
  transition: transform 0.3s var(--ease), opacity 0.2s var(--ease);
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.25rem;
  font-weight: 600;
  border-radius: 12px;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  font-size: 1rem;
  transition: transform 0.2s var(--ease), background 0.25s var(--ease), color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  color: white;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  box-shadow: 0 8px 24px rgba(31,111,235,0.35);
}
.btn-primary:hover { box-shadow: 0 12px 32px rgba(31,111,235,0.45); transform: translateY(-1px); }
.btn-ghost {
  color: var(--fg);
  background: transparent;
  border-color: var(--border);
}
.btn-ghost:hover { border-color: var(--brand); color: var(--brand); }

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: calc(100vh - var(--nav-h));
  display: grid;
  place-items: center;
  padding: 4rem 1.25rem 6rem;
  overflow: hidden;
  isolation: isolate;
}
.hero-bg {
  position: absolute; inset: 0; z-index: -1;
  background:
    radial-gradient(1200px 600px at 20% 10%, rgba(31,111,235,0.25), transparent 60%),
    radial-gradient(900px 500px at 80% 90%, rgba(22,177,164,0.25), transparent 60%),
    url('./img/Blue_Marble_2002.png') center/cover no-repeat;
  filter: saturate(1.05);
}
.hero-bg::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(180deg, color-mix(in oklab, var(--bg) 15%, transparent) 0%, var(--bg) 100%);
}
.hero-inner {
  max-width: var(--maxw);
  width: 100%;
  text-align: center;
}
.hero-title {
  font-size: clamp(2.5rem, 8vw, 6rem);
  color: var(--fg);
  text-shadow: 0 4px 30px color-mix(in oklab, var(--bg) 40%, transparent);
}
.hero-title .line { display: block; }
.hero-title .accent {
  background: linear-gradient(90deg, var(--brand), var(--brand-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-size: clamp(1.1rem, 3.5vw, 2rem);
  min-height: 1.4em;
  font-family: 'Inter', sans-serif;
  font-weight: 600;
  letter-spacing: 0;
}
.hero-title .accent::after {
  content: "|";
  margin-left: 2px;
  color: var(--brand-2);
  animation: caret 1s steps(1) infinite;
}
@keyframes caret { 50% { opacity: 0; } }

.hero-sub {
  max-width: 720px;
  margin: 1rem auto 2rem;
  font-size: clamp(1rem, 1.5vw, 1.15rem);
  color: var(--fg-mute);
}
.hero-cta { display: flex; gap: 0.75rem; justify-content: center; flex-wrap: wrap; }

.hero-stats {
  margin-top: 3rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  max-width: 720px;
  margin-inline: auto;
}
.stat {
  background: color-mix(in oklab, var(--bg-elev) 80%, transparent);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  backdrop-filter: blur(6px);
}
.stat .num {
  display: block;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--fg);
}
.stat .lbl { font-size: 0.85rem; color: var(--fg-mute); }

.scroll-hint {
  position: absolute;
  bottom: 1.25rem; left: 50%;
  transform: translateX(-50%);
  width: 26px; height: 42px;
  border: 2px solid var(--fg-mute);
  border-radius: 14px;
  display: inline-block;
  opacity: 0.7;
}
.scroll-hint span {
  display: block;
  width: 3px; height: 6px; margin: 6px auto 0;
  background: var(--fg-mute);
  border-radius: 2px;
  animation: scroll-dot 1.6s var(--ease) infinite;
}
@keyframes scroll-dot {
  0% { transform: translateY(0); opacity: 1; }
  70% { transform: translateY(14px); opacity: 0; }
  100% { transform: translateY(0); opacity: 0; }
}

/* ===== Sections ===== */
.section {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 6rem 1.25rem;
}
.section-head { text-align: center; max-width: 720px; margin: 0 auto 3rem; }
.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--brand);
  margin: 0 0 0.75rem;
}
.section-head h2 { font-size: clamp(1.75rem, 3.5vw, 2.5rem); }
.lede { font-size: 1.05rem; color: var(--fg-mute); }

/* Cards (services) */
.cards {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}
.card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), border-color 0.3s var(--ease);
  position: relative;
  overflow: hidden;
}
.card::before {
  content: "";
  position: absolute; inset: 0;
  background: radial-gradient(400px 200px at var(--mx, 50%) var(--my, 50%), color-mix(in oklab, var(--brand) 12%, transparent), transparent 60%);
  opacity: 0;
  transition: opacity 0.35s var(--ease);
  pointer-events: none;
}
.card:hover { transform: translateY(-4px); border-color: color-mix(in oklab, var(--brand) 40%, var(--border)); }
.card:hover::before { opacity: 1; }
.card .icon {
  width: 44px; height: 44px;
  border-radius: 12px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, color-mix(in oklab, var(--brand) 20%, var(--bg-elev)), color-mix(in oklab, var(--brand-2) 20%, var(--bg-elev)));
  color: var(--brand);
  margin-bottom: 1rem;
  font-size: 1.4rem;
}
.card h3 { font-size: 1.15rem; margin-bottom: 0.35rem; }

/* Chips (audience) */
.chips {
  display: flex; flex-wrap: wrap; gap: 0.75rem;
  justify-content: center; list-style: none; padding: 0; margin: 0;
}
.chip {
  padding: 0.65rem 1rem;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--fg);
  font-weight: 500;
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease), color 0.25s var(--ease);
}
.chip:hover { transform: translateY(-2px); border-color: var(--brand); color: var(--brand); }

/* About */
.about-grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: 1.1fr 0.9fr;
  align-items: center;
}
.about-copy .eyebrow { text-align: left; }
.check-list { list-style: none; padding: 0; margin: 1rem 0 0; }
.check-list li {
  position: relative;
  padding-left: 1.75rem;
  margin-bottom: 0.5rem;
  color: var(--fg);
}
.check-list li::before {
  content: "";
  position: absolute; left: 0; top: 0.55em;
  width: 10px; height: 10px; border-radius: 3px;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
}

.about-visual { display: grid; place-items: center; min-height: 320px; }
.globe {
  width: min(360px, 80%);
  aspect-ratio: 1;
  border-radius: 50%;
  background:
    radial-gradient(circle at 30% 25%, rgba(255,255,255,0.35), transparent 45%),
    url('./img/Blue_Marble_2002.png') center/cover no-repeat;
  box-shadow: inset -30px -30px 60px rgba(0,0,0,0.4), 0 30px 60px rgba(11,29,51,0.35);
  animation: spin 40s linear infinite;
  border: 1px solid var(--border);
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Signup */
.signup-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 2rem;
  align-items: center;
  box-shadow: var(--shadow);
  background-image:
    radial-gradient(600px 300px at 100% 0%, color-mix(in oklab, var(--brand-2) 12%, transparent), transparent 60%),
    radial-gradient(500px 260px at 0% 100%, color-mix(in oklab, var(--brand) 12%, transparent), transparent 60%);
}
.signup-form { display: grid; gap: 0.85rem; }
.field { display: grid; gap: 0.35rem; }
.field span { font-size: 0.85rem; color: var(--fg-mute); font-weight: 600; }
.field input,
.field select {
  padding: 0.75rem 0.9rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--fg);
  font-size: 1rem;
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}
.field input:focus,
.field select:focus {
  outline: none;
  border-color: var(--brand);
  box-shadow: 0 0 0 4px color-mix(in oklab, var(--brand) 25%, transparent);
}
.field.invalid input,
.field.invalid select { border-color: var(--danger); }
.err { color: var(--danger); font-size: 0.8rem; font-style: normal; min-height: 1em; }
.form-status { min-height: 1.4em; font-weight: 600; }
.form-status.success { color: var(--brand-2); }
.form-status.error { color: var(--danger); }

/* Contact */
.contact .section-head .btn { margin-top: 1rem; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--fg-mute);
}
.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 2rem 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}
.footer-inner .brand-name {
  font-family: 'Space Grotesk', sans-serif;
  color: var(--fg);
  font-weight: 700;
}
.site-footer p { margin: 0; }

/* Back to top */
.to-top {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  width: 44px; height: 44px;
  border-radius: 50%;
  border: none;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  color: white;
  font-size: 1.1rem;
  cursor: pointer;
  box-shadow: 0 12px 30px rgba(31,111,235,0.4);
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease);
  z-index: 800;
}
.to-top.show { opacity: 1; transform: translateY(0); }

/* ===== Scroll-reveal ===== */
[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
  will-change: opacity, transform;
}
[data-reveal].in-view {
  opacity: 1;
  transform: none;
}

/* ===== Responsive ===== */
@media (max-width: 860px) {
  .about-grid { grid-template-columns: 1fr; }
  .signup-card { grid-template-columns: 1fr; padding: 1.75rem; }
  .about-visual { min-height: 240px; }
}
@media (max-width: 700px) {
  .nav-toggle { display: inline-flex; align-items: center; justify-content: center; }
  .primary-nav {
    position: absolute;
    top: calc(var(--nav-h) - 4px);
    right: 1.25rem;
    left: 1.25rem;
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 0.5rem;
    display: none;
    flex-direction: column;
    align-items: stretch;
  }
  .primary-nav.open { display: flex; }
  .primary-nav ul { flex-direction: column; }
  .primary-nav a { padding: 0.85rem 1rem; border-radius: 8px; }
  .primary-nav a.active::after { display: none; }
  .theme-toggle { margin: 0.25rem 0.5rem; align-self: flex-start; }
  .section { padding: 4rem 1.25rem; }

  .hero { padding: 2.5rem 1rem 4rem; min-height: auto; }
  .hero-title { font-size: clamp(2.25rem, 12vw, 3.75rem); }
  .hero-title .accent { font-size: clamp(1rem, 4.5vw, 1.5rem); min-height: 1.6em; }
  .hero-sub { margin: 0.75rem auto 1.5rem; }
  .hero-cta { flex-direction: column; align-items: stretch; gap: 0.6rem; }
  .hero-cta .btn { justify-content: center; width: 100%; }
  .hero-stats {
    margin-top: 2rem;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.6rem;
  }
  .stat { padding: 0.75rem; }
  .stat .num { font-size: 1.35rem; }
  .stat .lbl { font-size: 0.78rem; }
  .scroll-hint { display: none; }
}

@media (max-width: 380px) {
  .hero-stats { grid-template-columns: 1fr; }
}