/* ==========================================================================
   NovelLabs.ai — site styles
   Mobile-first. Colours live in CSS variables so the palette is easy to swap.
   ========================================================================== */

:root {
  --bg: #ffffff;
  --bg-alt: #f4f6fb;
  --surface: #ffffff;
  --text: #0f172a;
  --text-muted: #4b5563;
  --border: #e2e8f0;
  --brand: #012860;          /* brand navy, sampled from the logo */
  --brand-strong: #021e43;
  --accent: #02d0c5;         /* brand teal, sampled from the logo */
  --accent-strong: #01b8ac;
  --on-brand: #ffffff;
  --shadow: 0 8px 24px rgba(15, 23, 42, 0.08);

  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --radius: 14px;
  --container: 1120px;
  --header-h: 68px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1120;
    --bg-alt: #111a2e;
    --surface: #131d33;
    --text: #e6eaf2;
    --text-muted: #a5afc2;
    --border: #23304a;
    --brand: #3b5bdb;
    --brand-strong: #2f4bc0;
    --accent: #02d0c5;
    --accent-strong: #02d0c5;
    --shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
  }
}

/* Reset ------------------------------------------------------------------ */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--header-h); }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
h1, h2, h3, p, ul, ol { margin: 0; }
ul, ol { padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

/* Layout helpers --------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 1.25rem;
}
.section { padding-block: 4.5rem; }
.section-alt { background: var(--bg-alt); }
.grid { display: grid; gap: 1.5rem; }

.eyebrow {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-strong);
  margin-bottom: 0.75rem;
}
h1 { font-size: clamp(2.1rem, 5.5vw, 3.6rem); line-height: 1.1; letter-spacing: -0.02em; }
h2 { font-size: clamp(1.7rem, 3.5vw, 2.4rem); line-height: 1.2; letter-spacing: -0.015em; margin-bottom: 1rem; }
h3 { font-size: 1.15rem; line-height: 1.3; margin-bottom: 0.5rem; }
.lead { font-size: 1.15rem; color: var(--text-muted); }
.section-intro { color: var(--text-muted); max-width: 42rem; margin-bottom: 2.5rem; }
.highlight { color: var(--accent-strong); }

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  padding: 0.5rem 1rem;
  background: var(--brand);
  color: var(--on-brand);
  z-index: 100;
}
.skip-link:focus { left: 0.5rem; top: 0.5rem; }

/* Buttons ---------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 1.4rem;
  border-radius: 999px;
  font-weight: 600;
  border: 2px solid transparent;
  transition: background-color 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--brand); color: var(--on-brand); }
.btn-primary:hover { background: var(--brand-strong); }
.btn-ghost { border-color: var(--border); color: var(--text); }
.btn-ghost:hover { border-color: var(--brand); }
.btn-small { padding: 0.5rem 1rem; background: var(--brand); color: var(--on-brand); }
.btn-small:hover { background: var(--brand-strong); }
.btn-large { padding: 1rem 2rem; font-size: 1.1rem; }

/* Header / nav ----------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-h);
  position: relative;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}
.brand-mark {
  width: 32px;
  height: 32px;
}
.brand-accent { color: var(--accent-strong); }
.brand-tld { color: var(--text-muted); font-weight: 500; }

.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  gap: 5px;
  padding: 0.6rem;
  margin-right: -0.6rem;
}
.nav-toggle-bar {
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.site-nav {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  flex-direction: column;
  gap: 0.25rem;
  padding: 1rem 1.25rem 1.25rem;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.site-nav.is-open { display: flex; }
.site-nav a {
  padding: 0.75rem 0;
  font-weight: 500;
  color: var(--text-muted);
}
.site-nav a:hover { color: var(--text); }
.site-nav .btn { margin-top: 0.5rem; color: var(--on-brand); }

/* Hero ------------------------------------------------------------------- */
.hero {
  padding-block: 5rem 4.5rem;
  background:
    radial-gradient(ellipse 60% 50% at 85% 10%, color-mix(in srgb, var(--accent) 18%, transparent), transparent 70%),
    radial-gradient(ellipse 50% 40% at 10% 90%, color-mix(in srgb, var(--brand) 14%, transparent), transparent 70%);
}
.hero-inner { max-width: 48rem; }
.hero .lead { margin-top: 1.5rem; }
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2.25rem;
}

/* Cards ------------------------------------------------------------------ */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: color-mix(in srgb, var(--accent) 50%, var(--border)); }
.card p { color: var(--text-muted); font-size: 0.97rem; }
.card-icon {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  margin-bottom: 1.25rem;
  color: var(--accent-strong);
  background: color-mix(in srgb, var(--accent) 14%, transparent);
}
.card-icon svg { width: 24px; height: 24px; }

/* Process steps ---------------------------------------------------------- */
.steps {
  display: grid;
  gap: 1.5rem;
  counter-reset: step;
}
.step {
  position: relative;
  padding: 1.5rem 1.5rem 1.5rem 4.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.step-num {
  position: absolute;
  left: 1.5rem;
  top: 1.6rem;
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--accent-strong);
  font-variant-numeric: tabular-nums;
}
.step p { color: var(--text-muted); font-size: 0.97rem; }

/* Why us ----------------------------------------------------------------- */
.why-inner { display: grid; gap: 2.5rem; }
.why-inner .section-intro { margin-bottom: 0; }
.checklist { display: grid; gap: 1rem; }
.checklist li {
  position: relative;
  padding-left: 2rem;
  color: var(--text-muted);
}
.checklist li strong { color: var(--text); }
.checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.35rem;
  width: 1.1rem;
  height: 1.1rem;
  border-radius: 50%;
  background: var(--accent) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 12.5 4 4 8-8'/%3E%3C/svg%3E") center / 70% no-repeat;
}

/* CTA -------------------------------------------------------------------- */
.cta {
  background: linear-gradient(135deg, var(--brand), var(--brand-strong) 60%, var(--accent-strong));
  color: var(--on-brand);
}
.cta-inner { text-align: center; max-width: 44rem; }
.cta .lead { color: color-mix(in srgb, var(--on-brand) 82%, transparent); margin-bottom: 2rem; }
.cta .btn-primary { background: var(--on-brand); color: var(--brand-strong); }
.cta .btn-primary:hover { background: color-mix(in srgb, var(--on-brand) 90%, var(--brand)); }

/* Footer ----------------------------------------------------------------- */
.site-footer {
  padding-block: 2rem;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.9rem;
}
.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: flex-start;
}
.footer-nav { display: flex; flex-wrap: wrap; gap: 1.25rem; }
.footer-nav a:hover { color: var(--text); }

/* Responsive ------------------------------------------------------------- */
@media (min-width: 640px) {
  .container { padding-inline: 2rem; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { flex-direction: row; justify-content: space-between; align-items: center; }
}

@media (min-width: 900px) {
  .nav-toggle { display: none; }
  .site-nav {
    display: flex;
    position: static;
    flex-direction: row;
    align-items: center;
    gap: 2rem;
    padding: 0;
    background: transparent;
    border: 0;
    box-shadow: none;
  }
  .site-nav a { padding: 0; }
  .site-nav .btn { margin-top: 0; }
  .hero { padding-block: 7rem 6rem; }
  .section { padding-block: 6rem; }
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .why-inner { grid-template-columns: 1.1fr 1fr; align-items: start; gap: 4rem; }
}

@media (min-width: 1100px) {
  .steps { grid-template-columns: repeat(4, 1fr); }
}

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