/* ========== Base & Theme ========== */
:root {
  --color-navy: #0a3d62;
  --color-royal: #1e90ff;
  --color-royal-700: #197bd8;
  --color-royal-800: #1468b6;
  --color-bg: #ffffff;
  --color-text: #333333;
  --color-muted: #6b7280;   /* neutral gray */
  --color-alt: #f3f5f7;
  --color-link: #1e90ff;
  --color-link-hover: #1468b6;
  --color-footer-link: #cde2ff;

  --radius: 8px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 6px 20px rgba(0,0,0,0.12);

  --container-w: 960px;    /* wider than 800 for breathing room */
  --space-1: 6px;
  --space-2: 10px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 32px;
  --space-6: 48px;
  --space-7: 64px;
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: Arial, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.55;
}

/* Improve default text rendering */
p { margin: 0 0 var(--space-3) 0; }
h1, h2, h3 { margin: 0 0 var(--space-3) 0; line-height: 1.2; }
ul { margin: 0; padding-left: 1.2rem; }

/* Utility */
.container {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 var(--space-4);
}
.section { padding: var(--space-6) 0; }
.section.alt { background: var(--color-alt); }
.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* ========== Header / Hero ========== */
header {
  background: var(--color-navy);
  color: #ffffff;
  padding: var(--space-7) 0 var(--space-7);
  text-align: center;
}
header h1 {
  font-size: clamp(32px, 4vw, 44px);
  letter-spacing: 0.2px;
}
.subtitle {
  max-width: 720px;
  margin: var(--space-2) auto var(--space-5);
  font-size: clamp(16px, 2.2vw, 20px);
  color: #e6eef7;
}

/* CTA button */
.btn-primary {
  display: inline-block;
  background: var(--color-royal);
  color: #ffffff;
  padding: 12px 22px;
  text-decoration: none;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  font-weight: 600;
  transition: background .15s ease, transform .05s ease, box-shadow .2s ease;
}
.btn-primary:hover { background: var(--color-royal-700); }
.btn-primary:active { transform: translateY(1px); box-shadow: none; }
.btn-primary:focus-visible {
  outline: 3px solid #ffffff;
  outline-offset: 2px;
}

/* ========== Features ========== */
#features h2,
#how-it-works h2 { font-size: clamp(22px, 3vw, 28px); }

.feature-list {
  list-style: none;
  padding-left: 0;
  margin: var(--space-4) 0 0 0;
}
.feature-list li {
  margin: 10px 0;
  font-size: 1.125rem;
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

/* Optional: green tick via pseudo element if you don't want ✔ in HTML
.feature-list li::before {
  content: "✔";
  color: #10b981;
  font-weight: 700;
}
*/

/* ========== Generic links / emphasis ========== */
a { color: var(--color-link); text-decoration: none; }
a:hover { color: var(--color-link-hover); text-decoration: underline; }
strong { font-weight: 700; }

/* ========== Footer ========== */
footer {
  background: var(--color-navy);
  color: #ffffff;
  padding: var(--space-5) 0;
  text-align: center;
}
.footer-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
  margin-bottom: var(--space-2);
}
.footer-links a {
  color: var(--color-footer-link);
  text-decoration: none;
  padding: 2px 4px;
  border-radius: 6px;
}
.footer-links a:hover { text-decoration: underline; }
.footer-links a:focus-visible {
  outline: 2px solid #ffffff;
  outline-offset: 2px;
}
footer p {
  opacity: 0.95;
  margin: 0;
  font-size: 0.95rem;
}

/* ========== Responsive polish ========== */
@media (max-width: 640px) {
  .section { padding: var(--space-5) 0; }
  header { padding: var(--space-6) 0; }
  .subtitle { margin-bottom: var(--space-4); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn-primary { transition: none; }
}