/* CircuitCalc — shared stylesheet */
/* Colors: dark PCB slate + cyan */

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

:root, [data-theme="light"] {
  --bg:        #0f1117;
  --card-bg:   #1a1c25;
  --accent:    #22d3ee;
  --text:      #e8eaed;
  --muted:     #8b95a5;
  --border:    #2a2d38;
  --input-bg:  #141620;
  --result-bg: #0c2a2e;
  --result-fg: #22d3ee;
  --tag-bg:    #0e3a40;
}
[data-theme="dark"] {
  --bg:        #141414;
  --card-bg:   #1e1e1e;
  --accent:    #22d3ee;
  --text:      #e5e5e5;
  --muted:     #8b8b8b;
  --border:    #333333;
  --input-bg:  #1a1a1a;
  --result-bg: #1a1a1a;
  --result-fg: #22d3ee;
  --tag-bg:    #2a2a2a;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg); color: var(--text); line-height: 1.5; min-height: 100vh;
  transition: background-color 0.3s, color 0.3s;
}
header { background: var(--card-bg); border-bottom: 2px solid var(--accent); padding: 18px 0; }
.header-inner {
  max-width: 860px; margin: 0 auto; padding: 0 16px;
  display: flex; align-items: baseline; gap: 16px;
}
.logo { font-size: 26px; font-weight: 800; letter-spacing: -0.5px; color: var(--text); }
.logo span { color: var(--accent); }
.tagline { font-size: 13px; color: var(--muted); }
nav { background: var(--card-bg); border-bottom: 1px solid var(--border); padding: 8px 0; }
.nav-inner {
  max-width: 860px; margin: 0 auto; padding: 0 16px;
  display: flex; gap: 8px; align-items: center; font-size: 12px; color: var(--muted);
}
.nav-inner a { color: var(--muted); text-decoration: none; }
.nav-inner a:hover { color: var(--accent); }
.nav-inner .sep { color: var(--border); }
main { max-width: 860px; margin: 0 auto; padding: 24px 16px 48px; }
.card {
  background: var(--card-bg); border: 1px solid var(--border); border-radius: 6px;
  padding: 24px; margin-bottom: 20px;
}
.card h1 { font-size: 22px; font-weight: 700; margin-bottom: 6px; letter-spacing: -0.3px; }
.card .subtitle { font-size: 13px; color: var(--muted); margin-bottom: 20px; }
.form-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 14px; margin-bottom: 16px;
}
.field { display: flex; flex-direction: column; gap: 5px; }
.field label {
  font-size: 11px; font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.6px; color: var(--muted);
}
.field input, .field select {
  background: var(--input-bg); border: 1px solid var(--border); border-radius: 4px;
  color: var(--text); font-size: 15px; padding: 9px 11px; width: 100%;
  transition: border-color 0.15s;
}
.field input:focus, .field select:focus { outline: none; border-color: var(--accent); }
.field select option { background: var(--input-bg); }
.radio-group { display: flex; gap: 12px; margin-bottom: 16px; flex-wrap: wrap; }
.radio-group label {
  display: flex; align-items: center; gap: 6px; font-size: 13px; color: var(--text);
  cursor: pointer; padding: 6px 12px; border: 1px solid var(--border);
  border-radius: 4px; transition: border-color 0.15s;
}
.radio-group input[type="radio"] { accent-color: var(--accent); }
.radio-group label:has(input:checked) { border-color: var(--accent); background: var(--tag-bg); }
.btn {
  display: inline-block; padding: 10px 22px; font-size: 14px; font-weight: 600;
  border: none; border-radius: 4px; cursor: pointer; transition: background 0.15s;
  text-decoration: none;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { opacity: 0.85; }
.btn-ghost { background: transparent; border: 1px solid var(--border); color: var(--muted); }
.btn-ghost:hover { border-color: var(--accent); color: var(--text); }
.result {
  background: var(--result-bg); border: 1px solid var(--border); border-radius: 4px;
  padding: 16px 20px; margin-top: 16px; display: none;
}
.result.visible { display: block; }
.result-row {
  display: flex; justify-content: space-between; align-items: baseline;
  padding: 5px 0; border-bottom: 1px solid var(--border); gap: 12px;
}
.result-row:last-child { border-bottom: none; }
.result-label { font-size: 12px; color: var(--muted); flex-shrink: 0; }
.result-value { font-size: 16px; font-weight: 700; color: var(--result-fg); text-align: right; }
.result-note {
  font-size: 12px; color: var(--muted); margin-top: 10px; line-height: 1.6;
  padding-top: 10px; border-top: 1px solid var(--border);
}
.ref-table { width: 100%; border-collapse: collapse; font-size: 13px; margin-top: 6px; }
.ref-table th {
  font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px;
  color: var(--muted); text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--border);
}
.ref-table td { padding: 6px 8px; border-bottom: 1px solid var(--border); color: var(--text); }
.ref-table tr:last-child td { border-bottom: none; }
.ref-table tr.highlight td { color: var(--accent); font-weight: 600; }
.ad-leaderboard {
  width: 100%; height: 90px; background: var(--card-bg); border: 1px dashed var(--border);
  border-radius: 4px; display: flex; align-items: center; justify-content: center;
  font-size: 11px; color: var(--border); margin: 16px 0;
}
.ad-rectangle {
  width: 300px; height: 250px; background: var(--card-bg); border: 1px dashed var(--border);
  border-radius: 4px; display: flex; align-items: center; justify-content: center;
  font-size: 11px; color: var(--border); margin: 16px auto;
}
.tools-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 14px; margin: 20px 0;
}
.tool-card {
  background: var(--card-bg); border: 1px solid var(--border); border-radius: 6px;
  padding: 18px; text-decoration: none; color: var(--text);
  transition: border-color 0.15s, transform 0.15s; display: block;
}
.tool-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.tool-card h3 { font-size: 15px; font-weight: 700; margin-bottom: 4px; }
.tool-card p { font-size: 12px; color: var(--muted); }
.tool-card-tag {
  display: inline-block; background: var(--tag-bg); color: var(--accent);
  font-size: 10px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.6px;
  padding: 2px 6px; border-radius: 3px; margin-bottom: 8px;
}
.hero {
  background: var(--card-bg); border: 1px solid var(--border); border-radius: 6px;
  padding: 32px 24px; margin-bottom: 24px; text-align: center;
}
.hero h1 { font-size: 32px; font-weight: 800; letter-spacing: -0.5px; margin-bottom: 10px; }
.hero h1 span { color: var(--accent); }
.hero p { font-size: 15px; color: var(--muted); max-width: 520px; margin: 0 auto; line-height: 1.6; }
.badge {
  display: inline-block; background: var(--tag-bg); color: var(--accent);
  font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.8px;
  padding: 3px 8px; border-radius: 3px; margin-bottom: 14px;
}
.seo-section {
  background: var(--card-bg); border: 1px solid var(--border); border-radius: 6px;
  padding: 24px; margin-top: 32px;
}
.seo-section h2 { font-size: 18px; font-weight: 700; margin-bottom: 14px; }
.seo-section p { font-size: 14px; color: var(--muted); margin-bottom: 12px; line-height: 1.7; }
.seo-section p:last-child { margin-bottom: 0; }
.email-capture {
  background: var(--card-bg); border: 2px dashed var(--border); border-radius: 6px;
  padding: 24px; margin-top: 20px; text-align: center;
}
.email-capture h2 { font-size: 16px; font-weight: 700; margin-bottom: 6px; }
.email-capture > p { font-size: 13px; color: var(--muted); margin-bottom: 14px; }
.capture-form {
  display: flex; gap: 8px; max-width: 400px; margin: 0 auto;
}
.capture-form input[type="email"] {
  flex: 1; background: var(--input-bg); border: 1px solid var(--border); border-radius: 4px;
  color: var(--text); font-size: 14px; padding: 9px 11px;
}
.capture-form input[type="email"]:focus { outline: none; border-color: var(--accent); }
.capture-note { font-size: 11px; color: var(--muted); margin-top: 10px; }
@media (max-width: 480px) {
  .capture-form { flex-direction: column; }
}
footer {
  text-align: center; padding: 28px 16px; font-size: 12px; color: var(--muted);
  border-top: 1px solid var(--border); margin-top: 32px;
}
@media (max-width: 600px) {
  .form-grid { grid-template-columns: 1fr 1fr; }
  .tools-grid { grid-template-columns: 1fr 1fr; }
  .header-inner { flex-direction: column; gap: 4px; }
  .result-row { flex-direction: column; gap: 2px; }
  .result-value { text-align: left; }
}
@media (max-width: 400px) {
  .form-grid { grid-template-columns: 1fr; }
  .tools-grid { grid-template-columns: 1fr; }
}
@media print {
  header, nav, footer, .ad-leaderboard, .ad-rectangle, .btn { display: none; }
  .result { display: block !important; border: 1px solid #000; }
  body { background: #fff; color: #000; }
}