/* ============================================================
   cardcenter.app — VAULT design system
   Shared styles for Home, Tool, Guide
   ============================================================ */

:root {
  --vault-0: #05070B;
  --vault-1: #0A0D13;
  --vault-2: #0E1218;
  --vault-3: #131821;
  --vault-4: #1A2030;
  --vault-5: #222935;

  --line-1: #171C25;
  --line-2: #222935;
  --line-3: #2E3746;
  --pewter-hi: #B8C2D0;
  --pewter-mid: #6B7585;
  --pewter-lo: #2B3340;

  --ink-0: #F2F4F7;
  --ink-1: #D5DAE3;
  --ink-2: #8993A4;
  --ink-3: #5A6474;
  --ink-4: #3A424F;

  --mint: #5DCAA5;
  --mint-hi: #8EDBC0;
  --mint-lo: #2E8F70;
  --mint-deep: #0F2E26;

  --cyan: #6FC2D9;
  --amber: #E5B84E;
  --coral: #E89A8C;

  --sans: 'Geist', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', sans-serif;
  --serif: 'Instrument Serif', 'Times New Roman', serif;
  --mono: 'JetBrains Mono', ui-monospace, Menlo, monospace;

  --max: 1200px;
  --gutter: 28px;

  --r-sm: 8px;
  --r-md: 10px;
  --r-lg: 14px;
  --r-xl: 18px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }
body {
  background: var(--vault-1);
  color: var(--ink-1);
  font-family: var(--sans);
  font-weight: 400;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  background-image:
    radial-gradient(ellipse 1200px 600px at 50% -100px, rgba(93,202,165,0.06), transparent 60%),
    radial-gradient(ellipse 900px 500px at 90% 40%, rgba(107,117,133,0.05), transparent 60%),
    linear-gradient(180deg, var(--vault-1), var(--vault-0));
  background-attachment: fixed;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.eyebrow {
  font-family: var(--mono);
  font-size: 11px; font-weight: 500;
  letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--ink-3);
  display: inline-flex; align-items: center; gap: 8px;
}
.eyebrow::before { content: ''; width: 18px; height: 1px; background: var(--pewter-mid); }
.eyebrow.mint { color: var(--mint); }
.eyebrow.mint::before { background: var(--mint); }

/* ============ NAV ============ */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(10,13,19,0.72);
  backdrop-filter: blur(14px) saturate(1.1);
  -webkit-backdrop-filter: blur(14px) saturate(1.1);
  border-bottom: 1px solid var(--line-1);
}
.nav-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter);
  height: 64px;
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px;
}
.brand {
  display: flex; align-items: center; gap: 12px;
  font-weight: 500; letter-spacing: -0.01em;
}
.brand-mark { width: 28px; height: 40px; display: grid; place-items: center; position: relative; }
.brand-mark svg { width: 100%; height: 100%; }
.brand-word { font-size: 16px; letter-spacing: -0.015em; display: flex; align-items: baseline; gap: 0; }
.brand-word b { font-weight: 600; color: var(--ink-0); }
.brand-word span { font-weight: 400; color: var(--ink-0); }
.brand-word i { font-style: normal; font-family: var(--mono); font-size: 12px; color: var(--mint); margin-left: 4px; letter-spacing: 0; position: relative; top: -1px; }

.nav-links { display: flex; gap: 4px; align-items: center; list-style: none; }
.nav-links a {
  font-size: 13.5px; font-weight: 500;
  color: var(--ink-2);
  padding: 8px 14px; border-radius: 8px;
  display: inline-flex; align-items: center; gap: 6px;
  transition: color .15s, background .15s;
}
.nav-links a:hover, .nav-links a.active { color: var(--ink-0); background: var(--vault-2); }
.nav-links a.active::before {
  content: ''; width: 4px; height: 4px; border-radius: 50%;
  background: var(--mint); box-shadow: 0 0 6px var(--mint);
}
.nav-cta {
  font-size: 13px; font-weight: 500;
  padding: 9px 16px;
  border: 1px solid var(--line-3);
  background: linear-gradient(180deg, var(--vault-3), var(--vault-2));
  color: var(--ink-0);
  border-radius: 8px;
  display: inline-flex; align-items: center; gap: 8px;
  transition: all .18s;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.04);
}
.nav-cta:hover { border-color: var(--mint); color: var(--mint); }
.nav-cta .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--mint); box-shadow: 0 0 8px var(--mint); }

/* ============ BUTTONS ============ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  font-family: var(--sans); font-size: 14px; font-weight: 500;
  padding: 12px 18px;
  border-radius: var(--r-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all .18s ease;
  letter-spacing: -0.005em;
  text-decoration: none;
}
.btn-primary {
  background: var(--mint);
  color: #05201A;
  font-weight: 600;
  border-color: var(--mint);
  box-shadow:
    0 8px 24px -10px rgba(93,202,165,0.55),
    inset 0 1px 0 rgba(255,255,255,0.25);
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow:
    0 0 0 1px rgba(93,202,165,0.3),
    0 12px 30px -10px rgba(93,202,165,0.65),
    inset 0 1px 0 rgba(255,255,255,0.3);
}
.btn-secondary, .btn-ghost {
  background: var(--vault-2);
  color: var(--ink-0);
  border-color: var(--line-3);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.03);
}
.btn-secondary:hover, .btn-ghost:hover {
  border-color: var(--pewter-mid);
  background: var(--vault-3);
}
.btn-lg { padding: 14px 22px; font-size: 15px; }

/* ============ PAGE HEADERS ============ */
.page-head {
  position: relative;
  padding: 64px 0 36px;
  border-bottom: 1px solid var(--line-1);
  overflow: hidden;
}
.page-head::before {
  content: '';
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--line-1) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-1) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black 20%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black 20%, transparent 80%);
  opacity: 0.5;
  pointer-events: none;
}
.page-head-inner { position: relative; display: flex; flex-direction: column; gap: 14px; max-width: 740px; }
.page-head h1 {
  font-family: var(--sans); font-weight: 500;
  font-size: clamp(32px, 4.2vw, 52px);
  line-height: 1.04;
  letter-spacing: -0.028em;
  color: var(--ink-0);
}
.page-head h1 em { font-family: var(--serif); font-style: italic; font-weight: 400; color: var(--mint-hi); }
.page-head .lede {
  font-size: 16px;
  color: var(--ink-2);
  max-width: 580px;
  line-height: 1.6;
}

/* ============ FOOTER ============ */
.footer {
  padding: 72px 0 40px;
  background: var(--vault-0);
  border-top: 1px solid var(--line-1);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 60px;
}
.footer-brand p {
  color: var(--ink-3); font-size: 13px; margin-top: 16px; line-height: 1.6; max-width: 280px;
}
.footer-col h4 {
  font-family: var(--mono); font-size: 10.5px;
  color: var(--ink-3); letter-spacing: 0.18em; text-transform: uppercase;
  margin-bottom: 16px;
}
.footer-col a {
  display: block; padding: 6px 0;
  color: var(--ink-1); font-size: 13.5px;
  transition: color .15s;
}
.footer-col a:hover { color: var(--mint); }

.footer-bottom {
  padding-top: 28px;
  border-top: 1px solid var(--line-1);
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 16px;
  font-family: var(--mono); font-size: 11px;
  color: var(--ink-3); letter-spacing: 0.05em;
}
.footer-bottom .disclaimer {
  max-width: 720px;
  font-family: var(--sans); font-size: 12px;
  color: var(--ink-3); letter-spacing: 0; line-height: 1.6;
}
.footer-bottom .stamp {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 6px 10px;
  border: 1px solid var(--line-2);
  border-radius: 6px;
  color: var(--ink-2);
}
.footer-bottom .stamp b { color: var(--mint); font-weight: 500; }

@media (max-width: 960px) {
  .nav-links a { display: none; }
  .nav-links a.active { display: inline-flex; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
  .page-head { padding: 40px 0 28px; }
  .page-head .lede { font-size: 15px; }
}
@media (max-width: 640px) {
  :root { --gutter: 16px; }
  .nav-inner { height: 56px; gap: 12px; }
  .brand-word { font-size: 15px; }
  .brand-word i { font-size: 11px; }
  .brand-mark { width: 24px; height: 34px; }
  .nav-links a.active { font-size: 12.5px; padding: 6px 10px; }
  .nav-cta { font-size: 12px; padding: 7px 12px; }
  .page-head { padding: 28px 0 20px; }
  .page-head-inner { gap: 10px; }
  .page-head .lede { font-size: 14px; line-height: 1.55; }
  .btn { padding: 12px 16px; font-size: 13.5px; min-height: 44px; }
  .btn-lg { padding: 13px 18px; font-size: 14px; }
  .footer { padding: 44px 0 28px; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; margin-bottom: 36px; }
  .footer-bottom { font-size: 10.5px; }
  .footer-bottom .disclaimer { font-size: 11.5px; }
}