:root {
  --os-dark: #142850;
  --os-md-dark: #27496d;
  --os-md-light: #0c7b93;
  --os-light: #00a8cc;
  --os-white: #ffffff;
  --os-radius-lg: 18px;
  --os-radius-md: 14px;
  --os-radius-sm: 10px;
  --os-shadow-soft: 0 18px 40px rgba(0, 0, 0, 0.14);
  --os-shadow-subtle: 0 10px 25px rgba(0, 0, 0, 0.08);
  --os-transition: 150ms ease-out;
}
html[data-theme="light"] {
  --os-bg: #ffffff;
  --os-bg-soft: #f6f8fb;
  --os-bg-card: #ffffff;
  --os-bg-accent: #e9f7fb;
  --os-text: #0e1422;
  --os-muted: #5b677a;
  --os-border: rgba(0, 0, 0, 0.08);
  --os-pill-bg: #eef4ff;
}
html[data-theme="dark"] {
  --os-bg: var(--os-dark);
  --os-bg-soft: #1d355a;
  --os-bg-card: #193154;
  --os-bg-accent: #163a45;
  --os-text: #f5f8ff;
  --os-muted: #a8b6cf;
  --os-border: rgba(255, 255, 255, 0.1);
  --os-pill-bg: rgba(0, 168, 204, 0.16);
}
*,
:before,
:after {
  box-sizing: border-box;
}
body {
  margin: 0;
  font-family: "Lato", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--os-text);
  background: radial-gradient(
      circle at top left,
      rgba(0, 168, 204, 0.18),
      transparent 55%
    ),
    var(--os-bg);
  -webkit-font-smoothing: antialiased;
}
main {
  padding-top: 80px;
}
a {
  text-decoration: none;
  color: inherit;
}
/* Header */
.os-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 40;
  backdrop-filter: blur(18px);
  background: linear-gradient(
    to bottom,
    rgba(246, 248, 251, 0.92),
    rgba(246, 248, 251, 0.82)
  );
  border-bottom: 1px solid var(--os-border);
}
html[data-theme="dark"] .os-header {
  background: linear-gradient(
    to bottom,
    rgba(20, 40, 80, 0.92),
    rgba(20, 40, 80, 0.82)
  );
}
.os-header-inner {
  max-width: 1120px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  gap: 18px;
}
.os-logo {
  display: flex;
  align-items: center;
  gap: 10px;
}
.os-logo-img {
  height: 26px;
  width: auto;
  display: block;
}
.os-nav {
  display: flex;
  gap: 18px;
  font-size: 14px;
}
.os-nav a {
  color: var(--os-muted);
  padding: 6px 10px;
  border-radius: 999px;
  transition: background-color var(--os-transition), color var(--os-transition);
}
.os-nav a:hover {
  color: var(--os-text);
  background-color: rgba(0, 0, 0, 0.04);
}
html[data-theme="dark"] .os-nav a:hover {
  background-color: rgba(255, 255, 255, 0.06);
}
.os-header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}
.os-link-ghost {
  font-size: 14px;
  color: var(--os-muted);
}
.os-link-ghost:hover {
  color: var(--os-text);
}
/* Buttons */
.os-btn-primary,
.os-btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 16px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 700;
  border: none;
  cursor: pointer;
  transition: transform var(--os-transition), box-shadow var(--os-transition),
    background-color var(--os-transition), color var(--os-transition);
}
.os-btn-lg {
  padding: 11px 22px;
  font-size: 15px;
}
.os-btn-primary {
  background: linear-gradient(135deg, var(--os-light), var(--os-md-light));
  color: #061016;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.16);
}
.os-btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 16px 32px rgba(0, 0, 0, 0.22);
}
.os-btn-secondary {
  background: transparent;
  border: 1px solid var(--os-border);
  color: var(--os-text);
}
.os-btn-secondary:hover {
  background-color: rgba(0, 0, 0, 0.03);
}
html[data-theme="dark"] .os-btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.06);
}
/* Theme toggle */
.os-theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--os-border);
  background-color: rgba(255, 255, 255, 0.85);
  cursor: pointer;
  font-size: 12px;
  color: var(--os-muted);
}
html[data-theme="dark"] .os-theme-toggle {
  background-color: rgba(0, 0, 0, 0.22);
}
.os-theme-toggle-icon {
  width: 18px;
  height: 18px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--os-light), var(--os-md-light));
}
/* Mobile toggle */
.os-mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  border: none;
  background: transparent;
  padding: 4px;
  cursor: pointer;
}
.os-mobile-menu-toggle span {
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background-color: var(--os-text);
}
/* Hero */
.os-hero {
  padding: 96px 20px 64px;
}
.os-hero-inner {
  max-width: 1120px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  gap: 40px;
  align-items: center;
}
.os-hero-copy h1 {
  font-family: "Space Grotesk", "Roc Grotesk", sans-serif;
  font-size: 44px;
  line-height: 1.05;
  margin: 10px 0 12px;
}
.os-hero-copy p {
  margin: 0 0 16px;
  color: var(--os-muted);
  font-size: 16px;
  max-width: 620px;
}
.os-pill {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: 999px;
  background-color: var(--os-pill-bg);
  font-size: 12px;
  font-weight: 700;
  color: var(--os-md-light);
}
html[data-theme="dark"] .os-pill {
  color: var(--os-light);
}
.os-grad {
  background: linear-gradient(135deg, var(--os-light), var(--os-md-light));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.os-hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}
.os-hero-meta {
  font-size: 13px;
  color: var(--os-muted);
}
.os-hero-visual {
  display: flex;
  justify-content: flex-end;
}
.os-hero-card {
  width: 100%;
  max-width: 420px;
  background: radial-gradient(
      circle at top,
      rgba(0, 168, 204, 0.25),
      transparent 60%
    ),
    var(--os-bg-card);
  border-radius: 24px;
  padding: 18px 18px 16px;
  box-shadow: var(--os-shadow-soft);
  border: 1px solid rgba(255, 255, 255, 0.7);
}
html[data-theme="dark"] .os-hero-card {
  border: 1px solid rgba(0, 168, 204, 0.22);
}
.os-hero-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}
.os-hero-card-title {
  font-size: 14px;
  font-weight: 700;
}
.os-hero-card-badge {
  font-size: 11px;
  padding: 4px 8px;
  border-radius: 999px;
  background-color: rgba(0, 0, 0, 0.12);
  color: var(--os-white);
}
.os-hero-card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 14px;
}
.os-hero-metric {
  padding: 8px 10px;
  border-radius: 14px;
  background-color: rgba(255, 255, 255, 0.75);
  border: 1px solid rgba(0, 0, 0, 0.03);
}
html[data-theme="dark"] .os-hero-metric {
  background-color: rgba(20, 40, 80, 0.65);
  border: 1px solid rgba(255, 255, 255, 0.07);
}
.os-hero-label {
  font-size: 11px;
  color: var(--os-muted);
}
.os-hero-value {
  display: block;
  font-size: 13px;
  font-weight: 700;
  margin-top: 2px;
}
.os-hero-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.os-hero-avatars {
  display: flex;
  align-items: center;
}
.os-avatar {
  width: 26px;
  height: 26px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--os-md-light), var(--os-light));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--os-white);
  font-size: 12px;
  font-weight: 700;
  border: 2px solid var(--os-bg-card);
  margin-left: -6px;
}
.os-avatar-main {
  margin-left: 0;
}
.os-hero-note {
  font-size: 12px;
  color: var(--os-muted);
}
/* Sections */
.os-section {
  padding: 72px 20px;
}
.os-section-soft {
  background: linear-gradient(to bottom, var(--os-bg-soft), var(--os-bg));
}
.os-section-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 32px;
  max-width: 1120px;
  margin: 0 auto 40px;
}
.os-section-header-centered {
  flex-direction: column;
  text-align: center;
  align-items: center;
}
.os-section-header h2 {
  font-family: "Space Grotesk", "Roc Grotesk", sans-serif;
  font-size: 32px;
  line-height: 1.2;
  margin: 0 0 8px;
}
.os-section-header p {
  margin: 0;
  color: var(--os-muted);
  max-width: 560px;
  font-size: 16px;
}
/* Value grid */
.os-value-grid {
  max-width: 1120px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}
.os-value-card {
  background-color: var(--os-bg-card);
  border-radius: var(--os-radius-md);
  padding: 16px 16px 14px;
  border: 1px solid var(--os-border);
  box-shadow: var(--os-shadow-subtle);
}
.os-value-card h3 {
  margin: 0 0 6px;
  font-size: 16px;
  font-family: "Space Grotesk", "Roc Grotesk", sans-serif;
}
.os-value-card p {
  margin: 0;
  font-size: 14px;
  color: var(--os-muted);
}
/* Product grid */
.os-product-grid {
  max-width: 1120px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}
.os-product-card {
  background-color: var(--os-bg-card);
  border-radius: var(--os-radius-md);
  padding: 16px 16px 14px;
  border: 1px solid var(--os-border);
  box-shadow: var(--os-shadow-subtle);
}
.os-product-card h3 {
  margin: 0 0 6px;
  font-family: "Space Grotesk", "Roc Grotesk", sans-serif;
  font-size: 18px;
}
.os-product-card p {
  margin: 0;
  font-size: 14px;
  color: var(--os-muted);
}
/* Split sections */
.os-section-split {
  background: var(--os-bg-soft);
}
.os-split {
  max-width: 1120px;
  margin: 0 auto 40px;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  align-items: center;
  gap: 32px;
}
.os-split-reverse {
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
}
.os-split-copy h2 {
  font-family: "Space Grotesk", "Roc Grotesk", sans-serif;
  font-size: 26px;
  margin: 0 0 10px;
}
.os-split-copy p {
  margin: 0 0 12px;
  color: var(--os-muted);
  font-size: 15px;
}
.os-bullets {
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 14px;
}
.os-bullets li {
  padding-left: 16px;
  position: relative;
  margin-bottom: 6px;
}
.os-bullets li:before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 6px;
  height: 6px;
  border-radius: 999px;
  background: var(--os-light);
}
.os-split-visual {
  display: flex;
  justify-content: center;
}
.os-split-card {
  background-color: var(--os-bg-card);
  border-radius: var(--os-radius-lg);
  padding: 16px 16px 14px;
  box-shadow: var(--os-shadow-subtle);
  border: 1px solid var(--os-border);
  width: min(420px, 100%);
}
.os-split-card h3 {
  margin: 0 0 10px;
  font-size: 16px;
}
.os-bars {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  height: 120px;
  margin-bottom: 8px;
}
.os-bar {
  flex: 1;
  border-radius: 12px;
  background: linear-gradient(180deg, var(--os-light), var(--os-md-light));
}
.os-bar-1 {
  height: 40%;
}
.os-bar-2 {
  height: 70%;
}
.os-bar-3 {
  height: 100%;
}
.os-caption {
  margin: 0;
  font-size: 12px;
  color: var(--os-muted);
}
.os-tag {
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 999px;
  background-color: rgba(0, 168, 204, 0.14);
  color: var(--os-md-dark);
  font-weight: 700;
}
html[data-theme="dark"] .os-tag {
  color: var(--os-light);
  background-color: rgba(0, 168, 204, 0.18);
}
.os-row {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
}
.os-row-sub {
  font-size: 12px;
  color: var(--os-muted);
}
.os-val {
  font-weight: 700;
}
.os-lock {
  width: 30px;
  height: 30px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--os-md-light), var(--os-light));
  margin-bottom: 8px;
}
/* Plans */
.os-plan-grid {
  max-width: 1120px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
}
.os-plan-card {
  position: relative;
  background-color: var(--os-bg-card);
  border-radius: var(--os-radius-lg);
  padding: 18px 18px 16px;
  box-shadow: var(--os-shadow-subtle);
  border: 1px solid var(--os-border);
}
.os-plan-card[data-badge]:before {
  content: attr(data-badge);
  position: absolute;
  top: 14px;
  right: 18px;
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 999px;
  background-color: rgba(0, 168, 204, 0.14);
  color: var(--os-md-dark);
  font-weight: 800;
}
html[data-theme="dark"] .os-plan-card[data-badge]:before {
  background-color: rgba(0, 168, 204, 0.18);
  color: var(--os-light);
}
.os-plan-card-accent {
  background: radial-gradient(
      circle at top,
      rgba(0, 168, 204, 0.22),
      transparent 60%
    ),
    var(--os-bg-card);
}
.os-plan-head h3 {
  margin: 0 0 4px;
  font-family: "Space Grotesk", "Roc Grotesk", sans-serif;
  font-size: 20px;
}
.os-plan-head p {
  margin: 0 0 14px;
  font-size: 14px;
  color: var(--os-muted);
}
.os-plan-features {
  list-style: none;
  padding: 0;
  margin: 0 0 12px;
  font-size: 13px;
  color: var(--os-text);
}
.os-plan-features li {
  padding-left: 16px;
  position: relative;
  margin-bottom: 4px;
}
.os-plan-features li:before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 6px;
  height: 6px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--os-light), var(--os-md-light));
}
.os-plan-cta {
  width: 100%;
  text-align: center;
  margin-bottom: 6px;
}
.os-plan-note {
  font-size: 11px;
  color: var(--os-muted);
}
/* FAQ */
.os-section-faq {
  background: var(--os-bg-soft);
}
.os-faq-grid {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.os-faq-item {
  background-color: var(--os-bg-card);
  border-radius: var(--os-radius-md);
  padding: 10px 14px;
  border: 1px solid var(--os-border);
}
.os-faq-item summary {
  cursor: pointer;
  list-style: none;
  font-weight: 800;
  font-size: 14px;
}
.os-faq-item summary::-webkit-details-marker {
  display: none;
}
.os-faq-item p {
  margin: 6px 0 4px;
  font-size: 13px;
  color: var(--os-muted);
}
/* CTA */
.os-section-cta {
  background: var(--os-bg);
  border-top: 1px solid var(--os-border);
}
.os-cta-row {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}
/* Footer */
.os-footer {
  background: var(--os-bg);
  border-top: 1px solid var(--os-border);
  padding: 24px 20px 14px;
}
.os-footer-inner {
  max-width: 1120px;
  margin: 0 auto 12px;
  display: flex;
  justify-content: space-between;
  gap: 32px;
}
.os-footer-brand {
  display: flex;
  align-items: flex-start;
  gap: 10px;
}
.os-footer-logo {
  width: 28px;
  height: 28px;
}
.os-footer-title {
  font-family: "Space Grotesk", "Roc Grotesk", sans-serif;
  font-size: 16px;
  font-weight: 700;
}
.os-footer-subtitle {
  font-size: 13px;
  color: var(--os-muted);
}
.os-footer-links {
  display: flex;
  gap: 32px;
  font-size: 13px;
}
.os-footer-links h4 {
  margin: 0 0 6px;
  font-size: 13px;
}
.os-footer-links a {
  display: block;
  margin-bottom: 4px;
  color: var(--os-muted);
}
.os-footer-links a:hover {
  color: var(--os-text);
}
.os-footer-bottom {
  max-width: 1120px;
  margin: 0 auto;
  font-size: 12px;
  color: var(--os-muted);
}
/* Responsive */
@media (max-width: 900px) {
  .os-hero-inner {
    grid-template-columns: 1fr;
  }
  .os-hero-visual {
    justify-content: flex-start;
  }
  .os-section-header {
    flex-direction: column;
  }
  .os-split,
  .os-split-reverse {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 720px) {
  .os-nav {
    display: none;
  }
  .os-header-actions {
    display: none;
  }
  .os-mobile-menu-toggle {
    display: flex;
  }
  .os-header-inner {
    padding-inline: 16px;
  }
  .os-section {
    padding-inline: 16px;
  }
}