/* kefinance.xyz — Currency Converter
   Visual identity: dark slate + electric blue, monospace accents,
   sharp 0px corners, trader-UI aesthetic, dense layout. */

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 15px; line-height: 1.6;
  color: #d8e0eb; background: #0f1822;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: #00d4ff; text-decoration: none; }
a:hover { color: #ffffff; text-decoration: underline; }

h1, h2, h3, h4 {
  font-family: -apple-system, "Segoe UI", sans-serif;
  font-weight: 700;
  letter-spacing: -.01em;
  color: #f0f5fb;
  line-height: 1.2; margin: 0 0 .55em;
}
h1 { font-size: clamp(1.9rem, 4vw, 2.7rem); font-weight: 800; }
h2 { font-size: clamp(1.3rem, 2.4vw, 1.65rem); margin-top: 1.5em; }
h3 { font-size: 1.05rem; font-family: "JetBrains Mono", Consolas, monospace; text-transform: uppercase; letter-spacing: .08em; font-weight: 700; color: #00d4ff; }
p { margin: 0 0 1em; }

code, kbd, samp, .mono {
  font-family: "JetBrains Mono", "Cascadia Mono", Consolas, monospace;
  font-size: .92em; background: #1a2332; padding: .12em .4em; border-radius: 0;
  color: #00d4ff;
  border: 1px solid #2a3a4f;
}

:root {
  --bg: #0f1822;
  --panel: #1a2332;
  --panel-2: #243248;
  --line: #2a3a4f;
  --cyan: #00d4ff;
  --cyan-dim: #008cb3;
  --green: #00ff88;
  --red: #ff4d6a;
  --text: #d8e0eb;
  --muted: #7c8aa0;
  --hi: #f0f5fb;
}

.container { width: min(1100px, 92%); margin: 0 auto; }

/* ---- Header ---- */
.site-header {
  background: var(--panel);
  border-bottom: 1px solid var(--cyan-dim);
  position: sticky; top: 0; z-index: 50;
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: .8rem 0;
}
.brand { display: inline-flex; align-items: center; gap: .65rem; line-height: 1.1; }
.brand-mark {
  width: 34px; height: 34px;
  background: var(--bg); color: var(--cyan);
  border: 1px solid var(--cyan);
  display: grid; place-items: center;
  font-family: "JetBrains Mono", monospace; font-weight: 700; font-size: .85rem; letter-spacing: 0;
  flex-shrink: 0;
}
.brand-text { display: inline-flex; flex-direction: column; gap: 1px; }
.brand-name {
  color: var(--hi); font-family: -apple-system, sans-serif; font-weight: 700;
  font-size: .95rem;
}
.brand-tagline {
  font-size: .68rem; font-weight: 600; color: var(--cyan);
  font-family: "JetBrains Mono", monospace;
  text-transform: uppercase; letter-spacing: .15em;
}
@media (max-width: 720px) { .brand-tagline { display: none; } }

.nav { display: flex; flex-wrap: wrap; gap: .25rem .9rem; align-items: center; row-gap: .25rem; }
.nav a {
  font-family: "JetBrains Mono", monospace; font-weight: 500; color: var(--text);
  font-size: .82rem; padding: .25rem 0; white-space: nowrap;
  text-transform: uppercase; letter-spacing: .04em;
}
.nav a:hover { color: var(--cyan); text-decoration: none; }
.nav-toggle {
  display: none; background: transparent; border: 0; padding: .4rem; cursor: pointer;
}
.nav-toggle span {
  display: block; width: 22px; height: 2px; background: var(--cyan);
  margin: 5px 0;
}

/* ---- Hero (split-pane) ---- */
.hero {
  padding: 3rem 0 2rem;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, var(--bg) 0%, var(--panel) 100%);
}
.hero-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 2.5rem; align-items: center;
}
.eyebrow {
  font-family: "JetBrains Mono", monospace;
  font-size: .75rem; letter-spacing: .15em; text-transform: uppercase;
  color: var(--cyan); font-weight: 600;
  margin-bottom: 1rem; display: inline-block;
  border-left: 3px solid var(--cyan); padding-left: .8rem;
}
.lead { font-size: 1.05rem; color: var(--muted); }

.hero-panel {
  background: var(--panel); border: 1px solid var(--line);
  padding: 1.5rem;
}
.hero-panel h3 { margin-top: 0; }
.hero-panel .stat {
  display: flex; justify-content: space-between; align-items: baseline;
  padding: .45rem 0;
  border-bottom: 1px solid var(--line);
  font-family: "JetBrains Mono", monospace; font-size: .92rem;
}
.hero-panel .stat:last-child { border-bottom: none; }
.hero-panel .stat .k { color: var(--muted); }
.hero-panel .stat .v { color: var(--green); font-weight: 600; }

/* ---- Tool ---- */
.tool {
  background: var(--panel); border: 1px solid var(--cyan-dim);
  padding: 1.6rem; margin: 2rem 0;
  border-top: 3px solid var(--cyan);
}
.tool h2 { margin-top: 0; }
.converter {
  display: grid; grid-template-columns: 1fr auto 1fr; gap: 1rem;
  align-items: end;
}
.converter-pane {
  background: var(--bg); border: 1px solid var(--line); padding: 1.2rem;
}
.converter-pane label {
  display: block; font-family: "JetBrains Mono", monospace; font-size: .72rem;
  color: var(--muted); text-transform: uppercase; letter-spacing: .1em;
  margin-bottom: .5rem;
}
.converter-pane input {
  font-family: "JetBrains Mono", monospace; font-size: 2rem; font-weight: 700;
  width: 100%; padding: .35rem 0;
  background: transparent; color: var(--hi);
  border: none; border-bottom: 2px solid var(--cyan-dim);
  outline: none;
}
.converter-pane input:focus { border-bottom-color: var(--cyan); }
.converter-pane select {
  font-family: "JetBrains Mono", monospace; font-size: .95rem; font-weight: 600;
  width: 100%; padding: .55rem .7rem; margin-top: .8rem;
  background: var(--panel-2); color: var(--cyan);
  border: 1px solid var(--line);
  outline: none;
}
.swap-btn {
  background: transparent; color: var(--cyan); border: 1px solid var(--cyan);
  padding: .55rem .7rem; font-size: 1.1rem; cursor: pointer;
  font-family: "JetBrains Mono", monospace;
  align-self: end; height: 38px;
}
.swap-btn:hover { background: var(--cyan); color: var(--bg); }

.rate-display {
  margin-top: 1.4rem; padding: 1rem 1.2rem;
  background: var(--bg); border-left: 3px solid var(--green);
  font-family: "JetBrains Mono", monospace; font-size: .95rem;
}
.rate-display .label { color: var(--muted); font-size: .72rem; text-transform: uppercase; letter-spacing: .1em; }
.rate-display .rate { color: var(--green); font-weight: 700; font-size: 1.2rem; }
.rate-display .meta { color: var(--muted); font-size: .8rem; margin-top: .3rem; }

.privacy-note {
  font-family: "JetBrains Mono", monospace; font-size: .82rem; color: var(--muted);
  border-left: 3px solid var(--cyan-dim);
  padding: .5rem .9rem; margin-top: 1.2rem;
}

/* ---- Content ---- */
.content { padding: 1.5rem 0 3rem; }
.content section { margin-bottom: 2rem; }

.author-card {
  display: grid; grid-template-columns: 84px 1fr; gap: 1.4rem;
  align-items: center; padding: 1.4rem;
  background: var(--panel); border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  margin: 1.2rem 0;
}
.author-avatar {
  width: 84px; height: 84px;
  background: var(--bg); color: var(--cyan);
  border: 1.5px solid var(--cyan);
  font-family: "JetBrains Mono", monospace;
  font-size: 1.7rem; font-weight: 700;
  display: grid; place-items: center;
}
.author-meta { color: var(--muted); font-size: .88rem; margin: 0 0 .4rem; font-family: "JetBrains Mono", monospace; }
.cred-row { display: flex; flex-wrap: wrap; gap: .35rem; margin-top: .5rem; }
.cred-row span {
  display: inline-block; padding: .15rem .55rem;
  background: var(--bg); border: 1px solid var(--line);
  font-size: .72rem; color: var(--cyan);
  font-family: "JetBrains Mono", monospace;
  text-transform: uppercase; letter-spacing: .04em;
}

.ref-table-wrap { overflow-x: auto; border: 1px solid var(--line); background: var(--panel); }
.ref-table { width: 100%; border-collapse: collapse; font-size: .9rem; min-width: 480px; font-family: "JetBrains Mono", monospace; }
.ref-table th, .ref-table td {
  padding: .65rem .85rem; text-align: left;
  border-bottom: 1px solid var(--line);
}
.ref-table thead th {
  background: var(--bg); color: var(--cyan);
  font-weight: 700; text-transform: uppercase; font-size: .75rem; letter-spacing: .08em;
  border-bottom: 2px solid var(--cyan-dim);
}
.ref-table tbody tr:hover td { background: var(--panel-2); }

.callout {
  border-left: 3px solid var(--cyan);
  background: var(--panel);
  padding: .9rem 1.1rem;
  margin: 1.2rem 0; font-size: .92rem;
  font-family: "JetBrains Mono", monospace;
}

/* Forms */
.form-card {
  background: var(--panel); border: 1px solid var(--line);
  padding: 1.6rem;
  margin: 1rem 0 2rem;
  border-top: 3px solid var(--cyan);
}
.form-card label { display: grid; gap: .35rem; margin-bottom: 1rem; font-family: "JetBrains Mono", monospace; font-size: .82rem; color: var(--cyan); text-transform: uppercase; letter-spacing: .05em; }
.form-card input, .form-card textarea, .form-card select {
  font: inherit; font-family: -apple-system, sans-serif; padding: .65rem .8rem;
  background: var(--bg); color: var(--text);
  border: 1px solid var(--line);
}
.form-card input:focus, .form-card textarea:focus, .form-card select:focus {
  outline: none; border-color: var(--cyan);
}
.btn {
  display: inline-block; padding: .65rem 1.4rem;
  font-family: "JetBrains Mono", monospace; font-weight: 700; font-size: .85rem;
  cursor: pointer; text-transform: uppercase; letter-spacing: .08em;
  border: 1px solid var(--cyan); background: transparent; color: var(--cyan);
}
.btn:hover { background: var(--cyan); color: var(--bg); }

/* Footer */
.site-footer {
  background: var(--bg); color: var(--muted);
  padding: 2.4rem 0 1.4rem;
  border-top: 1px solid var(--cyan-dim);
}
.site-footer a { color: var(--cyan); }
.site-footer a:hover { color: var(--hi); }
.site-footer .brand-name { color: var(--hi); }
.site-footer .brand-tagline { color: var(--cyan); }
.footer-grid {
  display: grid; gap: 1.6rem;
  grid-template-columns: 2fr 1fr 1fr;
  margin-bottom: 1.4rem;
}
.site-footer h4 {
  color: var(--cyan); font-family: "JetBrains Mono", monospace; font-size: .8rem;
  margin-bottom: .8rem; text-transform: uppercase; letter-spacing: .1em;
}
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin: .35rem 0; font-size: .9rem; }
.footer-bottom {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: .8rem;
  padding-top: 1.2rem; border-top: 1px solid var(--line);
  font-family: "JetBrains Mono", monospace; font-size: .76rem;
}

/* Responsive */
@media (max-width: 880px) {
  .hero-grid { grid-template-columns: 1fr; }
  .converter { grid-template-columns: 1fr; }
  .swap-btn { width: 100%; }
  .footer-grid { grid-template-columns: 1fr; }
  .author-card { grid-template-columns: 1fr; }

  .nav-toggle { display: block; }
  .nav {
    position: absolute; top: 100%; right: 4%; left: 4%;
    background: var(--panel); border: 1px solid var(--line);
    flex-direction: column; align-items: stretch; gap: 0;
    padding: .5rem; display: none;
  }
  .nav.open { display: flex; }
  .nav a { padding: .65rem .8rem; }
  .nav a:hover { background: var(--bg); color: var(--cyan); }
}