/* GulfDues - one stylesheet, no framework. Navy + sand gold, system fonts (no font download: fast on any phone). */
:root {
  --navy: #0b3d4f;
  --navy-2: #082c39;
  --ink: #15202b;
  --ink-2: #33414e;
  --muted: #607080;
  --line: #e2e6ea;
  --bg: #ffffff;
  --soft: #f4f7f9;
  --gold: #f2c14e;
  --gold-d: #a57a10;
  --ok: #0d7a3e;
  --bad: #b42318;
  --radius: 12px;
  --max: 1100px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; font-family: var(--font); font-size: 17px; line-height: 1.6; color: var(--ink-2); background: var(--bg); }
a { color: var(--navy); text-underline-offset: 3px; }
h1, h2, h3, h4 { color: var(--ink); line-height: 1.25; margin: 0 0 .5em; }
h1 { font-size: clamp(1.8rem, 4.5vw, 2.6rem); }
h2 { font-size: clamp(1.35rem, 3vw, 1.8rem); }
h3 { font-size: 1.12rem; }
p { margin: 0 0 1em; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }
.muted { color: var(--muted); }
.small { font-size: .9rem; }

/* header */
.top { background: var(--navy); color: #fff; position: sticky; top: 0; z-index: 20; }
.top-row { display: flex; align-items: center; gap: 20px; min-height: 62px; }
.logo { display: flex; align-items: center; gap: 10px; color: #fff; text-decoration: none; font-weight: 800; font-size: 1.15rem; }
.logo small { display: block; font-weight: 500; font-size: .72rem; color: #b9cdd6; }
.logo-mark { width: 40px; height: 36px; border-radius: 9px; background: var(--gold); color: var(--navy); display: grid; place-items: center; font-weight: 900; font-size: .95rem; letter-spacing: -.5px; }
.menu { display: flex; gap: 18px; list-style: none; margin: 0 0 0 auto; padding: 0; }
.menu a { color: #dce8ee; text-decoration: none; font-size: .95rem; font-weight: 600; }
.menu a:hover, .menu a[aria-current="page"] { color: var(--gold); }
.menu-btn { display: none; margin-left: auto; background: none; border: 1px solid #3d6676; color: #fff; border-radius: 8px; font-size: 1.2rem; padding: 4px 12px; cursor: pointer; }
@media (max-width: 860px) {
  .menu-btn { display: block; }
  .menu { display: none; position: absolute; left: 0; right: 0; top: 62px; background: var(--navy-2); flex-direction: column; gap: 0; padding: 6px 20px 14px; }
  .menu.open { display: flex; }
  .menu a { display: block; padding: 11px 0; border-bottom: 1px solid #1d4a5a; }
}

/* page head */
.hero { background: linear-gradient(180deg, var(--soft), #fff); padding: 40px 0 26px; border-bottom: 1px solid var(--line); }
.crumbs { font-size: .88rem; color: var(--muted); margin-bottom: 10px; }
.lead { font-size: 1.1rem; color: var(--muted); max-width: 760px; }
.badges { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.badges span { background: #fff; border: 1px solid var(--line); border-radius: 999px; padding: 4px 12px; font-size: .85rem; color: var(--ink-2); }
section { padding: 34px 0; }

/* calculator */
.calc { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; align-items: start; }
@media (max-width: 860px) { .calc { grid-template-columns: 1fr; } }
.card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; box-shadow: 0 1px 2px rgba(0,0,0,.04), 0 10px 26px -16px rgba(11,61,79,.35); }
.card h2, .card h3 { margin-top: 0; }
label { display: block; font-weight: 600; font-size: .95rem; margin: 0 0 14px; color: var(--ink); }
label small { font-weight: 400; color: var(--muted); }
input, select, textarea { display: block; width: 100%; margin-top: 6px; padding: 11px 12px; border: 1px solid #c9d2da; border-radius: 9px; font: inherit; font-size: 1rem; background: #fff; color: var(--ink); }
input:focus, select:focus, textarea:focus { outline: 2px solid var(--gold); border-color: var(--gold-d); }
.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.row3 { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 10px; }
.check { display: flex; gap: 8px; align-items: flex-start; font-weight: 500; }
.check input { width: auto; margin-top: 4px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: -4px 0 14px; }
.chips button { border: 1px solid var(--line); background: var(--soft); border-radius: 999px; padding: 6px 12px; font: inherit; font-size: .88rem; cursor: pointer; }
.chips button[aria-pressed="true"] { background: var(--navy); color: #fff; border-color: var(--navy); }
.result { position: sticky; top: 80px; }
.big { font-size: 2.1rem; font-weight: 800; color: var(--navy); margin: 4px 0 2px; }
.rows { margin: 14px 0 0; }
.rows div { display: flex; justify-content: space-between; gap: 12px; padding: 8px 0; border-bottom: 1px solid var(--line); font-size: .95rem; }
.rows div b { text-align: right; color: var(--ink); }
.note { background: #fff8e6; border: 1px solid #f1dfae; border-radius: 10px; padding: 10px 12px; font-size: .9rem; margin-top: 14px; }
.warn { color: var(--bad); }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; background: var(--navy); color: #fff; border: 0; border-radius: 10px; padding: 12px 18px; font: inherit; font-weight: 700; text-decoration: none; cursor: pointer; }
.btn:hover { background: var(--navy-2); color: #fff; }
.btn-gold { background: var(--gold); color: var(--navy); }
.btn-gold:hover { background: #e5ae2c; color: var(--navy); }
.btn-ghost { background: #fff; color: var(--navy); border: 1px solid var(--line); }
.btns { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 14px; }

/* home */
.tools { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
@media (max-width: 860px) { .tools { grid-template-columns: 1fr; } }
.tool { display: block; text-decoration: none; color: inherit; }
.tool:hover { border-color: var(--gold-d); }
.tool .ic { font-size: 1.6rem; }
.tool .go { color: var(--navy); font-weight: 700; font-size: .92rem; }

/* explain + faq */
.prose { max-width: 820px; }
.prose table { border-collapse: collapse; width: 100%; margin: 10px 0 18px; font-size: .95rem; }
.prose th, .prose td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; }
.prose th { background: var(--soft); }
.faq details { border-bottom: 1px solid var(--line); padding: 12px 0; }
.faq summary { cursor: pointer; font-weight: 700; color: var(--ink); }
.faq p { margin: 8px 0 0; }
.sources { font-size: .88rem; color: var(--muted); }

/* the soft call to Alpha */
.promo { background: var(--navy); color: #dce8ee; border-radius: var(--radius); padding: 22px; display: flex; gap: 18px; align-items: center; justify-content: space-between; flex-wrap: wrap; }
.promo strong { color: #fff; font-size: 1.1rem; }
.promo p { margin: 4px 0 0; }

/* invoice */
.items .row3 { align-items: end; }
.items .del { background: none; border: 0; color: var(--bad); font-size: 1.3rem; cursor: pointer; }
.inv { border: 1px solid var(--line); border-radius: 10px; padding: 22px; background: #fff; font-size: .92rem; }
.inv-head { display: flex; justify-content: space-between; gap: 14px; flex-wrap: wrap; border-bottom: 2px solid var(--navy); padding-bottom: 12px; margin-bottom: 12px; }
.inv-title { font-size: 1.4rem; font-weight: 800; color: var(--navy); }
.inv table { width: 100%; border-collapse: collapse; margin: 10px 0; }
.inv th, .inv td { border-bottom: 1px solid var(--line); padding: 7px 6px; text-align: left; }
.inv .n { text-align: right; white-space: nowrap; }
.inv-sum { margin-left: auto; width: min(320px, 100%); }
.inv-sum div { display: flex; justify-content: space-between; padding: 5px 0; }
.inv-sum .tot { font-weight: 800; border-top: 2px solid var(--navy); margin-top: 4px; padding-top: 8px; }
.inv-qr { display: flex; gap: 14px; align-items: center; margin-top: 14px; }
.inv-qr img, .inv-qr canvas { width: 130px; height: 130px; }
/* margin 0: the browser then prints no title, address, date or page number of its own on the invoice */
@page { margin: 0; }
@media print {
  .inv { padding: 14mm 14mm 10mm !important; }
  .top, .foot, .no-print, .hero, .faq, .promo, .explain { display: none !important; }
  body { background: #fff; }
  section { padding: 0; }
  .calc { display: block; }
  .inv { border: 0; padding: 0; }
}

/* footer */
.foot { background: var(--navy-2); color: #b9cdd6; padding: 34px 0 20px; margin-top: 30px; font-size: .92rem; }
.foot a { color: #dce8ee; }
.foot strong, .foot h4 { color: #fff; }
.foot ul { list-style: none; padding: 0; margin: 0; }
.foot li { margin: 4px 0; }
.foot-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 24px; }
@media (max-width: 760px) { .foot-grid { grid-template-columns: 1fr; } }
.foot-note { border-top: 1px solid #1d4a5a; margin-top: 22px; padding-top: 14px; font-size: .82rem; }

/* guides: charts, tables, steps (2026-10-24) */
.guide h2 { margin-top: 1.6em; }
.chart { margin: 18px 0 22px; background: var(--soft); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px 6px; }
.chart figcaption { font-weight: 700; color: var(--ink); margin-bottom: 6px; }
.chart svg { width: 100%; max-width: 620px; height: auto; display: block; }
.ch-b { fill: var(--navy); }
.ch-l { font: 600 12px var(--font); fill: var(--ink-2); }
.ch-v { font: 700 12px var(--font); fill: var(--gold-d); }
.tbl { overflow-x: auto; }
.steps { list-style: none; padding: 0; margin: 18px 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 10px; counter-reset: none; }
.steps li { background: #fff; border: 1px solid var(--line); border-top: 4px solid var(--gold); border-radius: 10px; padding: 12px; font-size: .93rem; }
.steps b { display: inline-grid; place-items: center; width: 26px; height: 26px; border-radius: 50%; background: var(--navy); color: #fff; margin-right: 6px; font-size: .85rem; }
.calc-cta { margin: 22px 0; }