/* ==========================================================================
   Zarem.mx — layout.css
   Mobile-first flexbox layout. Tailwind handles color/spacing/type utilities;
   this file owns structure: page shell, header + nav, hero wallpaper, sections.
   ========================================================================== */

:root {
  --zarem-blue: #1d4ed8;
  --zarem-blue-deep: #17398f;
  --zarem-ice: #f2f7ff;
  --zarem-line: #d6e3fb;
  --zarem-ink: #0e2259;

  /* Optional photo wallpaper. Drop a file at /assets/wallpaper.jpg and
     uncomment the next line — the twill pattern below stays on top of it. */
  /* --wallpaper-image: url("../assets/wallpaper.jpg"); */

  --header-h: 4rem;
  --gutter: 1.25rem;
  --max: 68rem;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: var(--header-h); }

body {
  margin: 0;
  color: var(--zarem-ink);
  background: #fff;
  -webkit-font-smoothing: antialiased;
}

/* ---------- Page shell: header / main / footer stacked in a column ---------- */
.site-shell {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
}
.site-main { flex: 1 0 auto; display: flex; flex-direction: column; }

.container {
  width: 100%;
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: #fff;
  border-bottom: 1px solid var(--zarem-line);
}
.site-header__bar {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-h);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: .625rem;
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  color: var(--zarem-blue);
  text-decoration: none;
}
.brand__mark {
  display: grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border-radius: .5rem;
  background: var(--zarem-blue);
  color: #fff;
  font-size: 1.05rem;
}

/* Nav — mobile: dropdown panel under the bar, toggled with [data-open] */
.nav {
  display: none;
  flex-direction: column;
  position: absolute;
  top: 100%;
  left: calc(var(--gutter) * -1);
  right: calc(var(--gutter) * -1);
  padding: .5rem var(--gutter) 1rem;
  background: #fff;
  border-bottom: 1px solid var(--zarem-line);
}
.nav[data-open="true"] { display: flex; }
.nav a {
  padding: .875rem 0;
  border-bottom: 1px solid var(--zarem-ice);
  font-weight: 600;
  color: var(--zarem-ink);
  text-decoration: none;
}
.nav a:last-child { border-bottom: 0; }
.nav a:hover { color: var(--zarem-blue); }

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  border: 1px solid var(--zarem-line);
  border-radius: .625rem;
  background: #fff;
  color: var(--zarem-blue);
  cursor: pointer;
}

/* ---------- Hero with wallpaper ---------- */
.hero {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: calc(100dvh - var(--header-h) - 6rem);
  padding-block: 4rem;
  color: #fff;
  background-color: var(--zarem-blue);
  /* Layers, top → bottom: optional photo, twill weave lines, blue gradient */
  background-image:
    var(--wallpaper-image, none),
    repeating-linear-gradient(
      135deg,
      transparent 0 18px,
      rgba(255, 255, 255, .09) 18px 19px
    ),
    linear-gradient(180deg, var(--zarem-blue) 0%, var(--zarem-blue-deep) 100%);
  background-size: cover, auto, cover;
  background-position: center;
}
.hero__inner {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  max-width: 40rem;
}
.hero__actions {
  display: flex;
  flex-direction: column;
  gap: .75rem;
}

/* ---------- Content sections ---------- */
.section { padding-block: 3.5rem; }
.section--ice { background: var(--zarem-ice); }
.section__inner { display: flex; flex-direction: column; gap: 2rem; }
.section__head { display: flex; flex-direction: column; gap: .75rem; max-width: 38rem; }

/* Rows: label on the left, description on the right at wider sizes */
.rows { display: flex; flex-direction: column; margin: 0; padding: 0; }
.row {
  display: flex;
  flex-direction: column;
  gap: .375rem;
  padding-block: 1.25rem;
  border-top: 1px solid var(--zarem-line);
}
.row:last-child { border-bottom: 1px solid var(--zarem-line); }
.row dt { font-weight: 700; }
.row dd { margin: 0; max-width: 34rem; color: #3b4d80; line-height: 1.6; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding-inline: 1.5rem;
  border-radius: .75rem;
  font-weight: 700;
  text-decoration: none;
  border: 2px solid transparent;
  transition: background-color .15s ease, color .15s ease, border-color .15s ease;
}
.btn--solid { background: #fff; color: var(--zarem-blue); }
.btn--solid:hover { background: var(--zarem-ice); }
.btn--ghost { border-color: rgba(255, 255, 255, .6); color: #fff; }
.btn--ghost:hover { background: rgba(255, 255, 255, .12); border-color: #fff; }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--zarem-line); }
.site-footer__bar {
  display: flex;
  flex-direction: column;
  gap: .5rem;
  padding-block: 1.5rem;
  font-size: .9rem;
  color: #3b4d80;
}

/* ---------- Focus + motion ---------- */
:focus-visible {
  outline: 3px solid #7aa2ff;
  outline-offset: 3px;
  border-radius: .25rem;
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn { transition: none; }
}

/* ==========================================================================
   ≥ 640px
   ========================================================================== */
@media (min-width: 640px) {
  :root { --gutter: 2rem; }
  .hero__actions { flex-direction: row; }
  .row { flex-direction: row; gap: 2rem; }
  .row dt { flex: 0 0 14rem; }
}

/* ==========================================================================
   ≥ 768px — nav becomes a horizontal row, toggle disappears
   ========================================================================== */
@media (min-width: 768px) {
  :root { --header-h: 4.5rem; }
  .nav-toggle { display: none; }
  .nav {
    position: static;
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 2rem;
    padding: 0;
    background: transparent;
    border: 0;
  }
  .nav a { padding: .5rem 0; border: 0; }
  .nav a.nav__cta {
    padding: .5rem 1.125rem;
    border-radius: .625rem;
    background: var(--zarem-blue);
    color: #fff;
  }
  .nav a.nav__cta:hover { background: var(--zarem-blue-deep); color: #fff; }

  .section { padding-block: 5rem; }
  .site-footer__bar { flex-direction: row; justify-content: space-between; }
}