/* CalcLoop — minimal dev-tools aesthetic */

:root {
  --bg: #0a0a0b;
  --bg-elev: #131316;
  --border: #24242a;
  --text: #e4e4e7;
  --text-dim: #9a9aa3;
  --accent: #4f8cff;
  --success: #3ecf8e;
  --radius: 10px;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.6;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 20px;
}

header.site {
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: rgba(10, 10, 11, 0.85);
  backdrop-filter: blur(8px);
  z-index: 10;
}

header.site .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  flex-wrap: wrap;
}

.logo {
  font-weight: 700;
  font-size: 18px;
  color: var(--text);
  letter-spacing: -0.02em;
}
.logo span { color: var(--accent); }

nav.main-nav {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  align-items: center;
}

nav.main-nav a {
  color: var(--text-dim);
  font-size: 14px;
  padding: 8px 12px;
  border-radius: 8px;
  transition: background 0.15s, color 0.15s;
}
nav.main-nav a:hover,
nav.main-nav a.active {
  color: var(--text);
  background: var(--bg-elev);
  text-decoration: none;
}

.btn-coffee {
  background: var(--accent);
  color: #fff !important;
  padding: 8px 14px !important;
  border-radius: 8px;
  font-weight: 600;
}
.btn-coffee:hover { background: #3d7ae0; text-decoration: none !important; }

.hero {
  padding: 64px 0 40px;
  text-align: center;
}
.hero h1 {
  font-size: 40px;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin: 0 0 16px;
}
.hero p {
  color: var(--text-dim);
  font-size: 17px;
  max-width: 560px;
  margin: 0 auto;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin: 40px 0 64px;
}

.tool-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: border-color 0.15s, transform 0.15s;
}
.tool-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}
.tool-card h3 {
  margin: 0 0 8px;
  font-size: 17px;
}
.tool-card h3 a { color: var(--text); }
.tool-card p {
  color: var(--text-dim);
  font-size: 14px;
  margin: 0;
}

.calc-header { padding: 40px 0 8px; }
.calc-header h1 { font-size: 30px; letter-spacing: -0.02em; margin: 0 0 8px; }
.calc-header p.lead { color: var(--text-dim); font-size: 16px; max-width: 640px; }

.calc-box {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  margin: 24px 0 40px;
}

.field-row {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}
.field {
  flex: 1;
  min-width: 160px;
}
.field label {
  display: block;
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 6px;
}
.field input,
.field select {
  width: 100%;
  background: #0d0d10;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 12px;
  border-radius: 8px;
  font-family: var(--mono);
  font-size: 14px;
}
.field input:focus,
.field select:focus {
  outline: none;
  border-color: var(--accent);
}

.btn-calc {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 11px 22px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  margin-top: 4px;
}
.btn-calc:hover { background: #3d7ae0; }

.results {
  margin-top: 24px;
  border-top: 1px solid var(--border);
  padding-top: 20px;
}
.result-row {
  display: flex;
  justify-content: space-between;
  padding: 8px 0;
  font-family: var(--mono);
  font-size: 14px;
  border-bottom: 1px dashed var(--border);
}
.result-row:last-child { border-bottom: none; }
.result-row .k { color: var(--text-dim); }
.result-row .v { color: var(--success); font-weight: 600; }

.article {
  color: var(--text-dim);
  font-size: 15px;
}
.article h2 {
  color: var(--text);
  font-size: 20px;
  margin: 32px 0 12px;
}
.article p { margin: 0 0 14px; }

.faq-item { margin-bottom: 16px; }
.faq-item h3 { font-size: 15px; color: var(--text); margin: 0 0 4px; }
.faq-item p { color: var(--text-dim); font-size: 14px; margin: 0; }

.source-note {
  font-size: 12.5px;
  color: var(--text-dim);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 14px;
  margin: 20px 0 40px;
}
.source-note strong { color: var(--text); font-weight: 600; }
.source-note.live { border-color: rgba(62,207,142,0.35); }
.source-note.live strong { color: var(--success); }

.donate-box {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 20px;
}
.donate-box h3 { margin-top: 0; font-size: 16px; }
.wallet {
  font-family: var(--mono);
  font-size: 13px;
  background: #0d0d10;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  word-break: break-all;
  margin-top: 8px;
  color: var(--accent);
}

.legal { color: var(--text-dim); font-size: 15px; padding: 40px 0 60px; }
.legal h1 { color: var(--text); font-size: 28px; margin-bottom: 8px; }
.legal .updated { font-size: 13px; margin-bottom: 32px; }
.legal h2 { color: var(--text); font-size: 18px; margin: 28px 0 10px; }
.legal p, .legal li { margin: 0 0 12px; }

footer.site {
  border-top: 1px solid var(--border);
  margin-top: 60px;
  padding: 32px 0;
  color: var(--text-dim);
  font-size: 13px;
}
footer.site .foot-row {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
footer.site nav a {
  color: var(--text-dim);
  margin-right: 16px;
  font-size: 13px;
}
footer.site nav a:hover { color: var(--text); }

@media (max-width: 640px) {
  header.site .wrap { flex-direction: column; height: auto; padding: 12px 20px; gap: 10px; }
  .hero h1 { font-size: 28px; }
}