:root {
  --bg: #0f1420;
  --card: #171e2e;
  --border: #263049;
  --text: #e8ecf4;
  --muted: #9aa4bd;
  --accent: #4f8cff;
  --accent-soft: rgba(79, 140, 255, .12);
  --ok: #3ddc84;
  --err: #ff6b6b;
  --radius: 14px;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}
.site-header {
  border-bottom: 1px solid var(--border);
  background: rgba(15, 20, 32, .9);
  position: sticky; top: 0; z-index: 10;
}
.nav {
  max-width: 860px; margin: 0 auto; padding: .8rem 1rem;
  display: flex; justify-content: space-between; align-items: center;
}
.brand { font-weight: 800; font-size: 1.15rem; color: var(--text); text-decoration: none; }
.brand:hover { color: var(--accent); }
.nav-links { display: flex; gap: .4rem; }
.nav-links a {
  color: var(--muted); text-decoration: none; font-size: .92rem;
  padding: .45rem .8rem; border-radius: 8px;
}
.nav-links a:hover { color: var(--text); background: var(--accent-soft); }
.nav-links a.active { color: var(--text); background: var(--accent-soft); }
.lang-select {
  background: var(--card); color: var(--text); border: 1px solid var(--border);
  border-radius: 8px; padding: .45rem .6rem; font-size: .9rem; cursor: pointer;
}
.lang-select:hover { border-color: var(--accent); }
.lang-select option { background: var(--card); }
main { max-width: 860px; margin: 0 auto; padding: 1rem 1rem 3rem; }
.hero { text-align: center; padding: 2.2rem 0 1.4rem; }
.hero h1 { font-size: clamp(1.7rem, 4.5vw, 2.5rem); margin: 0 0 .5rem; letter-spacing: -.02em; }
.hero .sub { color: var(--muted); margin: 0 auto; max-width: 34rem; }
.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.4rem; margin-bottom: 1.4rem;
}
.tool label { display: block; font-weight: 600; margin-bottom: .5rem; }
.tool input {
  width: 100%; font-size: 1.25rem; padding: .8rem 1rem;
  border-radius: 10px; border: 1px solid var(--border);
  background: var(--bg); color: var(--text); font-family: ui-monospace, monospace;
}
.tool input:focus { outline: 2px solid var(--accent); border-color: var(--accent); }
.error { color: var(--err); font-size: .9rem; margin: .4rem 0 0; }
.result-row { display: flex; gap: .7rem; margin-top: 1rem; align-items: stretch; }
.result-box {
  flex: 1; background: var(--accent-soft); border: 1px solid var(--accent);
  border-radius: 10px; padding: .8rem 1rem; min-width: 0;
}
.result-label { display: block; font-size: .78rem; color: var(--muted); text-transform: uppercase; letter-spacing: .06em; }
.result-box output {
  display: block; font-size: 1.5rem; font-weight: 700;
  font-family: ui-monospace, monospace; word-break: break-all;
}
.btn {
  border: none; border-radius: 10px; padding: .8rem 1.2rem;
  font-size: 1rem; font-weight: 600; cursor: pointer;
  background: var(--accent); color: #fff;
}
.btn.secondary { background: transparent; border: 1px solid var(--border); color: var(--text); }
.btn.secondary:hover { border-color: var(--accent); color: var(--accent); }
.bits-row { display: flex; align-items: center; gap: .7rem; margin-top: 1rem; flex-wrap: wrap; color: var(--muted); font-size: .95rem; }
.bits { display: flex; gap: .4rem; flex-wrap: wrap; }
.chip {
  border: 1px solid var(--border); background: transparent; color: var(--muted);
  border-radius: 999px; padding: .35rem .9rem; cursor: pointer; font-size: .9rem;
}
.chip.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.breakdown { margin-top: 1.2rem; border-top: 1px solid var(--border); padding-top: 1rem; }
.breakdown h2 { font-size: 1.1rem; margin: 0 0 .6rem; }
table { width: 100%; border-collapse: collapse; font-size: .95rem; }
th, td { text-align: left; padding: .5rem .6rem; border-bottom: 1px solid var(--border); font-family: ui-monospace, monospace; }
th { color: var(--muted); font-family: inherit; font-weight: 600; font-size: .85rem; text-transform: uppercase; letter-spacing: .05em; }
.sum { color: var(--muted); font-size: .95rem; }
.content h2 { font-size: 1.3rem; margin: 1.6rem 0 .6rem; }
.content h2:first-child { margin-top: 0; }
.content h3 { font-size: 1.05rem; margin: 1.1rem 0 .3rem; }
.content p, .content li { color: #c9d1e3; }
.content a { color: var(--accent); }
.ref-table { max-width: 340px; }
.site-footer {
  text-align: center; color: var(--muted); font-size: .88rem;
  padding: 1.6rem 1rem 2.4rem; border-top: 1px solid var(--border);
}
.site-footer a { color: var(--muted); }
@media (max-width: 560px) {
  .result-row { flex-direction: column; }
  .btn.secondary { width: 100%; }
}

/* Extra tool pages */
.tool textarea {
  width: 100%; font-size: 1.1rem; padding: .8rem 1rem;
  border-radius: 10px; border: 1px solid var(--border);
  background: var(--bg); color: var(--text); font-family: ui-monospace, monospace;
  resize: vertical;
}
.tool textarea:focus { outline: 2px solid var(--accent); border-color: var(--accent); }
.result-row .result {
  flex: 1; font-size: 1.2rem; padding: .8rem 1rem;
  border-radius: 10px; border: 1px solid var(--accent);
  background: var(--accent-soft); color: var(--text); font-family: ui-monospace, monospace;
  min-width: 0;
}
.copy-btn {
  border: 1px solid var(--border); background: transparent; color: var(--text);
  border-radius: 10px; padding: .8rem 1.1rem; font-size: 1.2rem; cursor: pointer;
}
.copy-btn:hover { border-color: var(--accent); color: var(--accent); }
.table-wrap { overflow-x: auto; }
.more-tools h2 { font-size: 1.2rem; margin: 0 0 .8rem; }
.tools-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: .6rem; }
.tools-grid a {
  display: block; padding: .8rem .6rem; border: 1px solid var(--border);
  border-radius: 10px; color: var(--text); text-decoration: none;
  text-align: center; font-weight: 600; font-size: .92rem;
}
.tools-grid a:hover { border-color: var(--accent); color: var(--accent); }
.ad-slot {
  margin: 0 0 1.4rem; min-height: 90px; display: flex;
  align-items: center; justify-content: center;
  border: 1px dashed var(--border); border-radius: var(--radius);
}
.ad-slot .adsbygoogle { width: 100%; }
.nav-links { flex-wrap: wrap; align-items: center; }