/* Coastal Technology Solutions. Colors come from the lighthouse logo: its navy and its sea blues. Coastal Tax gold
   appears only on the sister-company box. Every color is a token; dark mode follows the device setting. */
:root {
  --navy: #0B2A66;          /* the logo's navy */
  --blue: #1F5FB8;          /* the logo's blue, darkened for links and buttons: 6.2 to 1 on white */
  --link-hover: #184C94;
  --sky: #E4EDF9;           /* the logo's sky band */
  --gold: #BF9F00;
  --ink: #1F2A33;
  --muted: #55626E;
  --page: #FFFFFF;
  --tint: #F3F6FA;
  --card: #FFFFFF;
  --line: #DCE3EE;
  --header-bg: #FFFFFF;
  --heading: var(--navy);
  --link: var(--blue);
  --button-bg: var(--blue);
  --button-text: #FFFFFF;
  --cta-bg: var(--navy);
  --cta-text: #FFFFFF;
  --focus: #F2B705;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(21, 58, 91, .06), 0 6px 20px rgba(21, 58, 91, .06);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #E6EDF2;
    --muted: #A9B6C1;
    --page: #0D1726;
    --tint: #111F33;
    --card: #152740;
    --line: #233A57;
    --header-bg: #0D1726;
    --heading: #E6EDF2;
    --link: #7FB0F0;
    --button-bg: #7FB0F0;
    --button-text: #0B1626;
    --cta-bg: #111F33;
    --cta-text: #E6EDF2;
    --link-hover: #A3C7F5;
    --shadow: none;
    color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0; background: var(--page); color: var(--ink);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
img { max-width: 100%; height: auto; }
a { color: var(--link); text-underline-offset: 3px; }
a:hover { color: var(--link-hover); }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; border-radius: 4px; }
h1, h2, h3 { color: var(--heading); line-height: 1.2; margin: 0 0 .5em; }
h1 { font-size: clamp(2rem, 4.5vw, 3rem); letter-spacing: -.02em; }
h2 { font-size: clamp(1.4rem, 2.6vw, 1.9rem); }
h3 { font-size: 1.15rem; }
p { margin: 0 0 1em; }

.wrap { width: min(1120px, 100% - 32px); margin-inline: auto; }
.narrow > * { max-width: 760px; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--card); padding: 8px 12px; z-index: 10; }
.skip:focus { left: 16px; }

/* header */
.site-header { background: var(--header-bg); border-bottom: 1px solid var(--line); border-top: 4px solid var(--navy);
  position: sticky; top: 0; z-index: 5; }
.header-row { display: flex; align-items: center; gap: 24px; min-height: 72px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--heading); margin-right: auto; }
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-text strong { font-size: 1.35rem; font-weight: 600; letter-spacing: .22em; text-transform: uppercase; }
.brand-text small { color: var(--link); font-size: .72rem; font-weight: 600; letter-spacing: .14em; text-transform: uppercase; }
.site-nav { display: flex; align-items: center; gap: 24px; }
.site-nav ul { display: flex; gap: 22px; list-style: none; margin: 0; padding: 0; }
.site-nav a:not(.button) { color: var(--ink); text-decoration: none; font-weight: 500; }
.site-nav a:not(.button):hover, .site-nav a[aria-current="page"] { color: var(--link); }
.site-nav a[aria-current="page"] { text-decoration: underline; text-decoration-thickness: 2px; }
.menu-button { display: none; }

/* buttons */
.button { display: inline-block; background: var(--button-bg); color: var(--button-text); padding: 12px 22px;
  border-radius: 999px; text-decoration: none; font-weight: 600; border: 2px solid var(--button-bg); cursor: pointer;
  font-size: 1rem; }
.button:hover { background: var(--link-hover); border-color: var(--link-hover); color: var(--button-text); }
.button-small { padding: 8px 16px; font-size: .95rem; }
.button-ghost { background: transparent; color: var(--link); }
.button-ghost:hover { background: var(--link); color: var(--button-text); }
.button-light { background: #FFFFFF; color: var(--navy); border-color: #FFFFFF; }
.button-light:hover { background: #E6EDF2; border-color: #E6EDF2; color: var(--navy); }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 8px; }

/* sections */
.hero { padding: 72px 0 64px; background: linear-gradient(180deg, var(--sky), var(--page)); }
@media (prefers-color-scheme: dark) { .hero { background: linear-gradient(180deg, var(--tint), var(--page)); } }
.hero-grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 48px; align-items: center; }
.hero-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px;
  box-shadow: var(--shadow); border-left: 4px solid var(--link); }
.eyebrow { text-transform: uppercase; letter-spacing: .1em; font-size: .8rem; font-weight: 700; color: var(--link); margin-bottom: .6em; }
.tagline { font-size: 1.3rem; font-weight: 600; color: var(--heading); margin-top: -.2em; }
.lead strong { color: var(--heading); }
.lead { font-size: 1.15rem; color: var(--muted); max-width: 62ch; }
.page-head { padding: 64px 0 40px; background: var(--tint); border-bottom: 1px solid var(--line); }
.page-short { padding-bottom: 56px; }
.section { padding: 64px 0; }
.section-tint { background: var(--tint); }
.section-title { margin-bottom: .8em; }
.section-intro { max-width: 70ch; color: var(--muted); }
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }

.cards { display: grid; gap: 20px; }
.cards-3 { grid-template-columns: repeat(3, 1fr); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px;
  box-shadow: var(--shadow); display: flex; flex-direction: column; }
.card p { color: var(--muted); }
.card .more { margin-top: auto; font-weight: 600; }

.check-list { list-style: none; padding: 0; margin: 0 0 1em; }
.check-list li { position: relative; padding-left: 30px; margin: .55em 0; }
.check-list li::before { content: ""; position: absolute; left: 2px; top: .45em; width: 16px; height: 9px;
  border-left: 3px solid var(--link); border-bottom: 3px solid var(--link); transform: rotate(-45deg); }

.steps { list-style: none; counter-reset: step; padding: 0; margin: 0; display: grid;
  grid-template-columns: repeat(4, 1fr); gap: 20px; }
.steps li { counter-increment: step; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.steps li::before { content: counter(step); display: inline-grid; place-items: center; width: 34px; height: 34px;
  border-radius: 50%; background: var(--navy); color: #FFFFFF; font-weight: 700; margin-bottom: 12px; }
.steps p { color: var(--muted); margin: 0; }
@media (prefers-color-scheme: dark) { .steps li::before { background: var(--link); color: var(--button-text); } }

.sister { background: var(--card); border: 1px solid var(--line); border-top: 4px solid var(--gold);
  border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow); }

details { border-bottom: 1px solid var(--line); padding: 14px 0; }
summary { cursor: pointer; font-weight: 600; color: var(--heading); }
details p { margin: 10px 0 0; color: var(--muted); }

.cta { background: var(--cta-bg); color: var(--cta-text); padding: 48px 0; }
.cta h2 { color: var(--cta-text); margin-bottom: .2em; }
.cta p { margin: 0; opacity: .85; }
.cta-row { display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; }

.prose h2 { font-size: 1.3rem; margin-top: 1.5em; }

/* contact */
.contact-grid { display: grid; grid-template-columns: 1.6fr 1fr; gap: 48px; }
.form label { display: block; font-weight: 600; margin-bottom: 16px; }
.form input, .form select, .form textarea { display: block; width: 100%; margin-top: 6px; padding: 11px 12px;
  font: inherit; color: var(--ink); background: var(--card); border: 1px solid var(--line); border-radius: 8px; }
.form input:focus, .form select:focus, .form textarea:focus { border-color: var(--link); outline: 2px solid var(--link); outline-offset: 0; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.req { font-weight: 400; font-size: .85rem; color: var(--muted); }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.form-error { background: #FDECEC; color: #8A1C1C; border: 1px solid #F3B9B9; padding: 12px 14px; border-radius: 8px; }
.small { font-size: .9rem; color: var(--muted); margin-top: 12px; }
.contact-side h2 { font-size: 1.05rem; margin: 1.4em 0 .3em; }
.contact-side h2:first-child { margin-top: 0; }
.contact-side .big { font-size: 1.5rem; font-weight: 700; }

/* footer */
.site-footer { border-top: 1px solid var(--line); padding-top: 48px; font-size: .95rem; color: var(--muted); }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 32px; }
.site-footer h2 { font-size: .85rem; text-transform: uppercase; letter-spacing: .08em; color: var(--heading); }
.footer-brand { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--heading); }
.plain { list-style: none; padding: 0; margin: 0; }
.plain li { margin: .35em 0; }
.footer-base { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; border-top: 1px solid var(--line);
  margin-top: 32px; padding: 18px 0 28px; }
.footer-base p { margin: 0; }

/* phones and tablets */
@media (max-width: 900px) {
  .hero-grid, .split, .contact-grid { grid-template-columns: 1fr; gap: 32px; }
  .cards-3 { grid-template-columns: 1fr 1fr; }
  .steps { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 760px) {
  .menu-button { display: inline-block; background: none; border: 1px solid var(--line); color: var(--ink);
    border-radius: 8px; padding: 8px 14px; font: inherit; font-weight: 600; cursor: pointer; }
  .site-nav { display: none; position: absolute; left: 0; right: 0; top: 100%; background: var(--header-bg);
    border-bottom: 1px solid var(--line); flex-direction: column; align-items: stretch; padding: 8px 16px 20px; gap: 12px; }
  .site-nav.open { display: flex; }
  .site-nav ul { flex-direction: column; gap: 0; }
  .site-nav ul a { display: block; padding: 12px 0; border-bottom: 1px solid var(--line); }
  .site-nav .button { text-align: center; }
  .cards-3, .steps, .field-row, .footer-grid { grid-template-columns: 1fr; }
  .hero { padding: 48px 0; }
  .section { padding: 48px 0; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }