/* ==========================================================================
   OnCertificates - design tokens & base styles
   Palette: white / black / sky #98D2EB / navy #12233b.
   Type: SF Pro Expanded Black (all titles), SF Pro Display (body/UI).
   ========================================================================== */

/* --- Fonts (self-hosted, subset to woff2) -------------------------------- */
@font-face {
  font-family: "SF Pro Expanded";
  src: url("fonts/sfproexpanded-black.woff2") format("woff2");
  font-weight: 900; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "SF Pro Display";
  src: url("fonts/sfprodisplay-thin.woff2") format("woff2");
  font-weight: 100; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "SF Pro Display";
  src: url("fonts/sfprodisplay-light.woff2") format("woff2");
  font-weight: 300; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "SF Pro Display";
  src: url("fonts/sfprodisplay-medium.woff2") format("woff2");
  font-weight: 500; font-style: normal; font-display: swap;
}

:root {
  /* --- Color -------------------------------------------------------------- */
  --color-navy:        #12233b; /* headings, dark sections, primary buttons */
  --color-navy-deep:   #0d1b2e; /* darkest - footer, trust section */
  --color-sky:         #98D2EB; /* brand light blue - accents, fills, borders */
  --color-sky-soft:    #eef6fb; /* faint sky wash - alternating sections */
  --color-ink:         #141414; /* body text (near-black) */
  --color-slate:       #141414; /* alias: body text */
  --color-slate-soft:  #5b6672; /* muted / secondary text */
  --color-line:        #dbe7ef; /* hairline borders, dividers */
  --color-surface:     #ffffff; /* cards, panels */
  --color-bg:          #ffffff; /* page background */
  --color-bg-alt:      #eef6fb; /* alternating section background (sky wash) */
  --color-accent:      #12233b; /* links, CTA (navy for contrast on white) */
  --color-accent-dark: #0d1b2e; /* accent hover */
  --color-on-dark:     #eaf3f9; /* text on navy backgrounds */
  --color-on-dark-soft:#98D2EB; /* sky accent on navy */

  /* --- Typography --------------------------------------------------------- */
  --font-title: "SF Pro Expanded", system-ui, -apple-system, sans-serif;         /* all titles (Black) */
  --font-body:  "SF Pro Display", -apple-system, system-ui, "Segoe UI", sans-serif; /* body, captions, UI */

  --fs-micro: 0.6875rem;  /* 11px   - micrographic */
  --fs-xs:    0.78rem;    /* 12.5px - caption */
  --fs-sm:    0.875rem;   /* 14px   - small body / buttons */
  --fs-base:  1rem;       /* 16px   - body */
  --fs-md:    1.375rem;   /* 22px   - small header */
  --fs-lg:    1.625rem;   /* 26px   - large header */
  --fs-xl:    1.625rem;   /* 26px   - section headings */
  --fs-2xl:   2.25rem;    /* 36px   - large title */

  --lh-tight: 1.15;
  --lh-snug:  1.3;
  --lh-body:  1.7;

  --fw-normal:   400;
  --fw-medium:   500;
  --fw-semibold: 600;
  --fw-bold:     700;

  /* --- Spacing scale ------------------------------------------------------ */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --space-9: 6rem;

  /* --- Layout ------------------------------------------------------------- */
  --content-max: 68rem;   /* main content width cap */
  --measure:     40rem;   /* readable line-length cap for prose */
  --radius:      10px;
  --radius-sm:   6px;
  --shadow-sm:   0 1px 2px rgba(18, 35, 59, 0.06);
  --shadow-md:   0 6px 24px rgba(18, 35, 59, 0.08);
  --border:      1px solid var(--color-line);

  --section-pad-y: var(--space-9);
}

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

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  font-weight: 300;
  font-size: var(--fs-base);
  line-height: 1.6;
  color: var(--color-ink);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* All titles - SF Pro Expanded Black, differentiated by size */
h1, h2, h3, h4 {
  margin: 0 0 var(--space-4);
  font-family: var(--font-title);
  font-weight: 900;
  color: var(--color-navy);
  line-height: var(--lh-tight);
  letter-spacing: -0.01em;
}
h1 { font-size: var(--fs-2xl); }
h2 { font-size: var(--fs-xl); }
h3 { font-size: var(--fs-md); }

p { margin: 0 0 var(--space-4); max-width: var(--measure); }

a {
  color: var(--color-accent);
  text-decoration: none;
}
a:hover { color: var(--color-accent-dark); text-decoration: underline; }

/* Visible keyboard focus for accessibility */
a:focus-visible,
button:focus-visible,
.btn:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

img { max-width: 100%; height: auto; display: block; }

/* --- Layout helpers ------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

.section { padding-block: var(--section-pad-y); }
.section--alt  { background: var(--color-bg-alt); }
.section--dark { background: var(--color-navy-deep); color: var(--color-on-dark); }
.section--dark h1,
.section--dark h2,
.section--dark h3 { color: #fff; }

/* Caption / overline - SF Pro Display Medium, uppercase, tracked */
.eyebrow {
  display: inline-block;
  font-family: var(--font-body);
  font-size: var(--fs-xs);
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-navy);
  margin-bottom: var(--space-4);
}

/* Lead / intro - SF Pro Display Thin, larger */
.lead {
  font-family: var(--font-body);
  font-weight: 100;
  font-size: 1.25rem;
  line-height: 1.5;
  color: var(--color-slate);
}

/* --- Buttons -------------------------------------------------------------- */
.btn {
  display: inline-block;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: var(--fs-sm);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  line-height: 1;
  padding: 0.95rem 1.6rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}
.btn--primary {
  background: var(--color-navy);
  color: #fff;
}
.btn--primary:hover {
  background: var(--color-navy-deep);
  color: #fff;
  text-decoration: none;
}
.btn--ghost {
  background: transparent;
  border-color: var(--color-sky);
  color: var(--color-navy);
}
.btn--ghost:hover {
  background: var(--color-sky-soft);
  border-color: var(--color-sky);
  text-decoration: none;
}

/* --- Hero ----------------------------------------------------------------- */
.hero { padding-block: calc(var(--section-pad-y) + var(--space-6)); }
.hero__inner { max-width: 48rem; }
/* SF Pro Expanded is a wide face; scale fluidly so long words never clip. */
.hero h1 {
  font-size: clamp(1.375rem, 6.4vw, 2.5rem);
  line-height: 1.08;
  letter-spacing: -0.01em;
  overflow-wrap: break-word;
  margin-bottom: var(--space-5);
}
.hero__subhead { max-width: 38rem; margin-bottom: var(--space-6); }
.hero__actions { display: flex; flex-wrap: wrap; gap: var(--space-3); }
.hero__scope {
  max-width: 40rem;
  margin-top: var(--space-6);
  padding-left: var(--space-4);
  border-left: 3px solid var(--color-sky);
  color: var(--color-slate);
  font-size: var(--fs-sm);
  line-height: 1.6;
}
.hero__scope strong { color: var(--color-navy); font-weight: var(--fw-semibold); }

.btn--lg { padding: 1.05rem 1.9rem; font-size: var(--fs-base); }

/* --- Section head --------------------------------------------------------- */
.section-head { max-width: var(--measure); margin-bottom: var(--space-7); }
.section-head .lead { margin-bottom: 0; }
.eyebrow--on-dark { color: var(--color-on-dark-soft); }
.lead--on-dark { color: var(--color-on-dark); }

/* --- Trust list ----------------------------------------------------------- */
.trust {
  margin: 0;
  display: grid;
  gap: var(--space-5);
}
.trust__item {
  border: 1px solid rgba(159, 176, 195, 0.22);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.03);
  padding: var(--space-6);
}
.trust__term {
  color: #fff;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: var(--fs-md);
  letter-spacing: -0.01em;
  margin-bottom: var(--space-3);
  line-height: var(--lh-snug);
}
.trust__desc {
  margin: 0;
  max-width: 52rem;
  color: var(--color-on-dark);
}

@media (min-width: 720px) {
  .trust { grid-template-columns: 1fr; }
  .trust__item {
    display: grid;
    grid-template-columns: 18rem 1fr;
    gap: var(--space-6);
    align-items: start;
  }
  .trust__term { margin-bottom: 0; }
}

/* --- Cards (problem grid) ------------------------------------------------- */
.cards {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}
.card {
  background: var(--color-surface);
  border: var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: var(--space-5);
}
.card__title { margin-bottom: var(--space-2); }
.card__body { margin: 0; color: var(--color-slate); }

/* --- Steps (how it works) ------------------------------------------------- */
.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-5);
  counter-reset: step;
}
.step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-5);
  align-items: start;
  padding-bottom: var(--space-5);
  border-bottom: var(--border);
}
.step:last-child { border-bottom: 0; padding-bottom: 0; }
.step__num {
  flex: none;
  display: grid;
  place-items: center;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 50%;
  background: var(--color-navy);
  color: #fff;
  font-size: var(--fs-md);
  font-weight: var(--fw-semibold);
  line-height: 1;
}
.step__content { padding-top: var(--space-1); }
.step__title { margin-bottom: var(--space-2); }
.step__body { margin: 0; }

@media (max-width: 640px) {
  .cards { grid-template-columns: 1fr; }
}

/* --- Contact -------------------------------------------------------------- */
.contact {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-7);
}
.contact__intro { max-width: var(--measure); }
.contact__email { font-size: var(--fs-sm); color: var(--color-slate-soft); }
.contact__email a { font-weight: var(--fw-medium); }

.contact__form {
  background: var(--color-surface);
  border: var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: var(--space-6);
}
.field { margin-bottom: var(--space-4); }
.field label {
  display: block;
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--color-navy);
  margin-bottom: var(--space-2);
}
.field input,
.field textarea {
  width: 100%;
  font: inherit;
  font-size: var(--fs-sm);
  color: var(--color-navy);
  background: var(--color-bg);
  border: var(--border);
  border-radius: var(--radius-sm);
  padding: 0.7rem 0.85rem;
}
.field textarea { resize: vertical; min-height: 7rem; }
.field input:focus,
.field textarea:focus {
  border-color: var(--color-accent);
  background: #fff;
  outline: none;
  box-shadow: 0 0 0 3px rgba(31, 95, 139, 0.15);
}
.contact__form .btn { margin-top: var(--space-2); }
.contact__note { margin: var(--space-4) 0 0; font-size: var(--fs-sm); min-height: 1.25rem; }
.contact__note--ok  { color: var(--color-accent-dark); }
.contact__note--err { color: #a12b2b; }

@media (min-width: 820px) {
  .contact {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
    align-items: start;
  }
}

/* --- Results / stats (used when the Results block is uncommented) --------- */
.stats {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}
.stat {
  background: var(--color-surface);
  border: var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: var(--space-6);
  text-align: center;
}
.stat__value {
  margin: 0 0 var(--space-2);
  font-size: var(--fs-2xl);
  font-weight: var(--fw-bold);
  color: var(--color-navy);
  line-height: 1;
  letter-spacing: -0.02em;
}
.stat__label { margin: 0; font-size: var(--fs-sm); color: var(--color-slate-soft); }

@media (max-width: 640px) {
  .stats { grid-template-columns: 1fr; }
}

/* --- Header / nav --------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: saturate(1.2) blur(8px);
  border-bottom: var(--border);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 4rem;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-title);
  font-weight: 900;
  font-size: 1.2rem;
  color: var(--color-navy);
  letter-spacing: -0.01em;
}
.brand:hover { text-decoration: none; }
.brand__mark {
  width: 30px;
  height: 30px;
  border-radius: 7px;
  flex: none;
}
.site-nav { display: flex; align-items: center; gap: var(--space-6); }
.site-nav .nav-link {
  color: var(--color-slate);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
}
.site-nav .nav-link:hover { color: var(--color-navy); text-decoration: none; }

/* --- Footer --------------------------------------------------------------- */
.site-footer {
  background: var(--color-navy-deep);
  color: var(--color-on-dark-soft);
  padding-block: var(--space-7);
  font-size: var(--fs-sm);
  border-top: 1px solid rgba(159, 176, 195, 0.15);
}
.site-footer a { color: var(--color-on-dark); }
.footer__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-title);
  font-weight: 900;
  font-size: 1.2rem;
  color: #fff;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-3);
}
.footer__mark {
  width: 28px;
  height: 28px;
  border-radius: 7px;
  flex: none;
}
.footer__tagline { max-width: 34rem; margin: 0 0 var(--space-5); }
.footer__nav { display: flex; flex-wrap: wrap; gap: var(--space-5); margin-bottom: var(--space-5); }
.footer__nav a { font-weight: var(--fw-medium); }
.footer__legal { margin: 0; color: var(--color-on-dark-soft); font-size: var(--fs-xs); }

/* --- Utilities ------------------------------------------------------------ */
.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute; left: var(--space-4); top: -3rem;
  background: var(--color-navy); color: #fff;
  padding: var(--space-2) var(--space-4); border-radius: var(--radius-sm);
  transition: top 0.15s ease; z-index: 20;
}
.skip-link:focus { top: var(--space-3); text-decoration: none; }

/* --- Responsive ----------------------------------------------------------- */
@media (max-width: 640px) {
  :root {
    --section-pad-y: var(--space-8);
  }
  .site-nav { gap: var(--space-4); }
  .site-nav .nav-link { display: none; } /* hide secondary links, keep CTA */
  /* The expanded wordmark is wide; shrink it so it clears the CTA on phones. */
  .brand { font-size: 1rem; gap: var(--space-2); }
  .brand__mark { width: 26px; height: 26px; }
  .site-header .btn--primary { padding: 0.7rem 1rem; font-size: var(--fs-xs); }
}

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