/* Atlantic Exchange — design system: Exaggerated Minimalism / Trust & Authority
   Palette: navy #0F172A bg · gold #F59E0B primary · IBM Plex Sans/Mono */

/* fonts loaded via <link preconnect + stylesheet> in each page head (faster than @import) */

:root {
  --bg: #0F172A;
  --bg-raise: #16213B;
  --muted: #272F42;
  --border: #334155;
  --fg: #F8FAFC;
  --fg-dim: #94A3B8;
  --primary: #F59E0B;
  --primary-strong: #FBBF24;
  --on-primary: #0F172A;
  --buy: #10B981;
  --sell: #F87171;
  --danger: #EF4444;
  --radius: 14px;
  --maxw: 1120px;
  --sans: 'IBM Plex Sans', system-ui, -apple-system, sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}
body {
  background: var(--bg); color: var(--fg);
  font-family: var(--sans); font-size: 16px; line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img, svg { max-width: 100%; display: block; }
a { color: var(--primary-strong); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }
.mono { font-family: var(--mono); }

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(15, 23, 42, 0.88); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner { display: flex; align-items: center; gap: 28px; height: 68px; }
.nav-logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; color: var(--fg); letter-spacing: -0.02em; }
.nav-logo:hover { text-decoration: none; }
.nav-links { display: flex; gap: 22px; margin-left: auto; align-items: center; }
.nav-links a { color: var(--fg-dim); font-size: 14.5px; font-weight: 500; }
.nav-links a:hover { color: var(--fg); text-decoration: none; }
.nav-cta {
  background: var(--primary); color: var(--on-primary) !important;
  padding: 9px 18px; border-radius: 10px; font-weight: 600;
  transition: background 180ms ease, transform 180ms ease;
}
.nav-cta:hover { background: var(--primary-strong); transform: translateY(-1px); text-decoration: none; }
.nav-burger { display: none; margin-left: auto; background: none; border: 1px solid var(--border); color: var(--fg); border-radius: 8px; padding: 8px 10px; cursor: pointer; }
@media (max-width: 820px) {
  .nav-links { display: none; position: absolute; top: 68px; left: 0; right: 0; background: var(--bg-raise); border-bottom: 1px solid var(--border); flex-direction: column; padding: 18px 20px; align-items: flex-start; }
  .nav-links.open { display: flex; }
  .nav-burger { display: block; }
}
/* short nav variant (exchange/compliance): always an inline row, even on mobile */
.nav-links.nav-links-inline,
.nav-links.nav-links-inline.open {
  display: flex; position: static; padding: 0; border: 0; background: none;
  flex-direction: row; align-items: center; margin-left: auto;
}

/* keyboard focus everywhere, not just form fields */
a:focus-visible, button:focus-visible, summary:focus-visible, [role='tab']:focus-visible {
  outline: 2px solid var(--primary); outline-offset: 2px; border-radius: 6px;
}

/* ---------- ticker ---------- */
.ticker { border-bottom: 1px solid var(--border); background: var(--bg-raise); overflow: hidden; }
.ticker-inner { display: flex; gap: 34px; padding: 9px 20px; overflow-x: auto; scrollbar-width: none; white-space: nowrap; }
.ticker-inner::-webkit-scrollbar { display: none; }
.tick { font-family: var(--mono); font-size: 13px; color: var(--fg-dim); }
.tick b { color: var(--fg); font-weight: 600; }
.tick .up { color: var(--buy); }

/* ---------- hero ---------- */
.hero { padding: 84px 0 40px; }
.hero h1 {
  font-size: clamp(2.6rem, 7vw, 5.2rem); font-weight: 700; line-height: 1.04;
  letter-spacing: -0.045em; max-width: 15ch;
}
.hero h1 em { font-style: normal; color: var(--primary); }
.hero p.lede { margin-top: 22px; font-size: clamp(1.05rem, 2vw, 1.25rem); color: var(--fg-dim); max-width: 56ch; }
.hero-ctas { display: flex; gap: 14px; margin-top: 34px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 14px 26px; border-radius: 12px; font-weight: 600; font-size: 15.5px;
  border: 1px solid transparent; cursor: pointer; font-family: var(--sans);
  transition: background 180ms ease, transform 180ms ease, border-color 180ms ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--primary); color: var(--on-primary); }
.btn-primary:hover { background: var(--primary-strong); }
.btn-ghost { background: transparent; color: var(--fg); border-color: var(--border); }
.btn-ghost:hover { border-color: var(--fg-dim); }
.btn-buy { background: var(--buy); color: #052E22; }
.btn-sell { background: var(--sell); color: #450A0A; }
.btn:disabled { opacity: 0.45; cursor: not-allowed; transform: none; }
.trust-row { display: flex; gap: 26px; margin-top: 44px; flex-wrap: wrap; color: var(--fg-dim); font-size: 13.5px; }
.trust-row span { display: inline-flex; gap: 8px; align-items: center; }
.trust-row svg { width: 16px; height: 16px; stroke: var(--primary); flex: none; }

/* ---------- sections ---------- */
section { padding: 72px 0; }
.sec-kicker { font-family: var(--mono); font-size: 12.5px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--primary); margin-bottom: 12px; }
.sec-title { font-size: clamp(1.7rem, 4vw, 2.6rem); font-weight: 700; letter-spacing: -0.03em; line-height: 1.15; max-width: 24ch; }
.sec-sub { color: var(--fg-dim); margin-top: 12px; max-width: 60ch; }

/* ---------- calculator ---------- */
.calc-card {
  background: var(--bg-raise); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px; max-width: 560px; box-shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
}
.calc-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 48px; align-items: start; }
@media (max-width: 900px) { .calc-grid { grid-template-columns: 1fr; } .calc-card { max-width: none; } }
.side-toggle { display: grid; grid-template-columns: 1fr 1fr; background: var(--muted); border-radius: 11px; padding: 4px; margin-bottom: 18px; }
.side-toggle button {
  padding: 11px 0; border: 0; border-radius: 8px; background: transparent; color: var(--fg-dim);
  font-weight: 600; font-size: 15px; cursor: pointer; font-family: var(--sans); transition: background 160ms ease, color 160ms ease;
}
.side-toggle button.active-buy { background: var(--buy); color: #052E22; }
.side-toggle button.active-sell { background: var(--sell); color: #450A0A; }
.field { margin-bottom: 15px; }
.field label { display: block; font-size: 12.5px; font-weight: 600; letter-spacing: 0.05em; text-transform: uppercase; color: var(--fg-dim); margin-bottom: 7px; }
.field input, .field select, .field textarea {
  width: 100%; background: var(--bg); border: 1px solid var(--border); color: var(--fg);
  border-radius: 10px; padding: 13px 14px; font-size: 16px; font-family: var(--sans);
  transition: border-color 160ms ease;
}
.field input:focus, .field select:focus, .field textarea:focus { outline: 2px solid var(--primary); outline-offset: 1px; border-color: var(--primary); }
.field input.mono-in { font-family: var(--mono); }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 480px) { .two-col { grid-template-columns: 1fr; } }
.calc-out { border-top: 1px dashed var(--border); margin-top: 6px; padding-top: 16px; }
.calc-row { display: flex; justify-content: space-between; font-size: 14px; color: var(--fg-dim); padding: 3.5px 0; gap: 12px; }
.calc-row b { color: var(--fg); font-family: var(--mono); font-weight: 600; text-align: right; }
.calc-total { display: flex; justify-content: space-between; align-items: baseline; margin-top: 10px; gap: 12px; }
.calc-total .lbl { font-size: 14px; color: var(--fg-dim); }
.calc-total .val { font-family: var(--mono); font-size: clamp(1.4rem, 3.4vw, 1.9rem); font-weight: 600; color: var(--primary-strong); text-align: right; }
.rate-note { font-size: 12.5px; color: var(--fg-dim); margin-top: 12px; line-height: 1.55; }
.rate-note .stale { color: var(--danger); font-weight: 600; }

/* ---------- cards / grids ---------- */
.cards-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 40px; }
.cards-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 40px; }
@media (max-width: 900px) { .cards-3, .cards-4 { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .cards-3, .cards-4 { grid-template-columns: 1fr; } }
.card { background: var(--bg-raise); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; }
.card h3 { font-size: 17px; font-weight: 600; letter-spacing: -0.01em; margin: 14px 0 8px; }
.card p { font-size: 14.5px; color: var(--fg-dim); }
.card .icn { width: 38px; height: 38px; border-radius: 10px; background: var(--muted); display: flex; align-items: center; justify-content: center; }
.card .icn svg { width: 20px; height: 20px; stroke: var(--primary); }
.step-num { font-family: var(--mono); color: var(--primary); font-size: 13px; font-weight: 600; }

/* coin chips */
.coin-grid { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 30px; }
.coin-chip {
  display: inline-flex; align-items: center; gap: 9px; background: var(--bg-raise);
  border: 1px solid var(--border); border-radius: 999px; padding: 9px 16px; font-size: 14px; font-weight: 500;
}
.coin-chip .net { color: var(--fg-dim); font-size: 12.5px; font-family: var(--mono); }
.coin-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--primary); }

/* ---------- FAQ ---------- */
.faq details { border-bottom: 1px solid var(--border); padding: 18px 0; }
.faq summary { cursor: pointer; font-weight: 600; font-size: 16.5px; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '+'; color: var(--primary); font-family: var(--mono); }
.faq details[open] summary::after { content: '−'; }
.faq details p { color: var(--fg-dim); margin-top: 10px; max-width: 70ch; font-size: 15px; }

/* ---------- forms / status ---------- */
.form-card { background: var(--bg-raise); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; max-width: 620px; }
.form-msg { margin-top: 12px; font-size: 14.5px; display: none; }
.form-msg.ok { display: block; color: var(--buy); }
.form-msg.err { display: block; color: var(--danger); }
.hp { position: absolute; left: -9999px; opacity: 0; height: 0; overflow: hidden; }

/* ---------- exchange app ---------- */
.xc-wrap { max-width: 640px; margin: 0 auto; padding: 46px 20px 90px; }
.steps { display: flex; gap: 8px; margin-bottom: 28px; }
.steps .st { flex: 1; height: 4px; border-radius: 4px; background: var(--muted); }
.steps .st.on { background: var(--primary); }
.xc-card { background: var(--bg-raise); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; }
.xc-title { font-size: 22px; font-weight: 700; letter-spacing: -0.02em; margin-bottom: 4px; }
.xc-sub { color: var(--fg-dim); font-size: 14.5px; margin-bottom: 22px; }
.xc-actions { display: flex; gap: 12px; margin-top: 24px; flex-wrap: wrap; }
.xc-actions .btn { flex: 1; min-width: 150px; }
.quote-box { background: var(--bg); border: 1px solid var(--border); border-radius: 12px; padding: 18px; margin-top: 6px; }
.addr-box {
  background: var(--bg); border: 1px solid var(--border); border-radius: 12px; padding: 18px;
  display: flex; flex-direction: column; align-items: center; gap: 14px; text-align: center;
}
.addr-box .addr { font-family: var(--mono); font-size: 13.5px; word-break: break-all; color: var(--fg); }
.addr-box img.qr, .addr-box canvas.qr { background: #fff; padding: 10px; border-radius: 10px; width: 190px; height: 190px; }
.wallet-btns { display: grid; gap: 10px; margin-top: 16px; }
.wallet-btn {
  display: flex; align-items: center; gap: 12px; width: 100%; text-align: left;
  background: var(--bg); color: var(--fg); border: 1px solid var(--border); border-radius: 12px;
  padding: 14px 16px; font-size: 15px; font-weight: 600; cursor: pointer; font-family: var(--sans);
  transition: border-color 160ms ease, background 160ms ease;
}
.wallet-btn:hover { border-color: var(--primary); }
.wallet-btn .sub { display: block; font-size: 12.5px; color: var(--fg-dim); font-weight: 400; }
.badge { display: inline-flex; align-items: center; gap: 7px; font-size: 12.5px; font-family: var(--mono); padding: 5px 11px; border-radius: 999px; border: 1px solid var(--border); color: var(--fg-dim); }
.badge.ok { color: var(--buy); border-color: rgba(16, 185, 129, 0.4); }
.badge.warn { color: var(--primary-strong); border-color: rgba(245, 158, 11, 0.4); }
.badge.bad { color: var(--danger); border-color: rgba(239, 68, 68, 0.4); }
.countdown { font-family: var(--mono); color: var(--primary-strong); }
.spinner { width: 16px; height: 16px; border: 2px solid var(--border); border-top-color: var(--primary); border-radius: 50%; animation: spin 0.8s linear infinite; display: inline-block; vertical-align: -3px; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- footer ---------- */
footer { border-top: 1px solid var(--border); padding: 44px 0 60px; margin-top: 40px; }
.foot-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 30px; }
@media (max-width: 720px) { .foot-grid { grid-template-columns: 1fr; } }
footer h4 { font-size: 13px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--fg-dim); margin-bottom: 12px; }
footer ul { list-style: none; }
footer li { margin-bottom: 8px; }
footer li a { color: var(--fg-dim); font-size: 14.5px; }
footer li a:hover { color: var(--fg); }
.disclaimer { font-size: 12.5px; color: var(--fg-dim); line-height: 1.65; margin-top: 26px; border-top: 1px solid var(--border); padding-top: 20px; }

/* ---------- prose (compliance) ---------- */
.prose { max-width: 760px; }
.prose h2 { font-size: 24px; letter-spacing: -0.02em; margin: 40px 0 12px; }
.prose p, .prose li { color: var(--fg-dim); font-size: 15.5px; margin-bottom: 12px; }
.prose ul { padding-left: 22px; }
.prose strong { color: var(--fg); }