/* ── CSS Variables ── */
:root {
  --bg: #0d0f1a;
  --surface: #161927;
  --surface2: #1e2235;
  --border: #2a2f4a;
  --text: #e8eaf6;
  --muted: #7b82a8;
  --accent: #5c7cfa;
  --green: #2ecc71;
  --red: #e74c3c;
}

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

body {
  background: var(--bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
  font-family: 'Segoe UI', system-ui, sans-serif;
  padding-bottom: 40px;
  color: var(--text);
}

#appVersion {
  position: fixed;
  bottom: 8px;
  right: 10px;
  font-size: 10px;
  color: #2a2f4a;
  pointer-events: none;
}

/* ── Topbar ── */
.topbar {
  width: 100%;
  max-width: 480px;
  padding: 16px 16px 8px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  padding: 8px 14px;
  flex-shrink: 0;
  -webkit-tap-highlight-color: transparent;
  transition: background 0.15s, border-color 0.15s;
}
.back-btn .arrow { color: var(--accent); }
.back-btn:active { background: var(--surface2); border-color: var(--accent); }

.menu-wrapper { position: relative; flex: 1; }

.menu-btn {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 10px;
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 500;
  height: auto;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  -webkit-tap-highlight-color: transparent;
  transition: background 0.15s, border-color 0.15s;
  font-family: inherit;
}
.menu-btn:active { background: var(--surface2); border-color: var(--accent); }
.menu-btn .arrow { font-size: 10px; color: var(--accent); transition: transform 0.2s; margin-left: auto; }
.menu-btn.open .arrow { transform: rotate(180deg); }
.menu-btn.open { border-color: var(--accent); }

.dropdown {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  right: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 8px 32px rgba(0,0,0,0.6);
  z-index: 10;
}
.dropdown.open { display: block; }

.dropdown-item {
  padding: 13px 16px;
  color: var(--text);
  font-size: 14px;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition: background 0.12s, color 0.12s;
  border-bottom: 1px solid var(--border);
}
.dropdown-item:last-child { border-bottom: none; }
.dropdown-item:hover,
.dropdown-item.active { background: rgba(92,124,250,0.12); color: var(--accent); }
.dropdown-item.disabled { color: #3a4060; cursor: default; font-style: italic; }

/* ── Card ── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 24px;
  width: calc(100% - 32px);
  max-width: 480px;
  animation: fadeIn 0.25s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Calc title ── */
.calc-title {
  color: var(--accent);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 18px;
}

/* ── Knapper ── */
button {
  border: none;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  height: 48px;
  cursor: pointer;
  transition: transform 0.08s, opacity 0.08s;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
  font-family: inherit;
}

button:active { transform: scale(0.95); opacity: 0.85; }

.action-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 18px;
}

.btn-secondary {
  background: transparent;
  border: 1.5px solid rgba(231,76,60,0.45);
  color: var(--red);
  font-size: 14px;
  height: 46px;
  border-radius: 10px;
  transition: background 0.15s;
}
.btn-secondary:active { background: rgba(231,76,60,0.1); }

.btn-primary {
  background: var(--surface2);
  border: 1.5px solid var(--border);
  color: var(--muted);
  font-size: 14px;
  height: 46px;
  border-radius: 10px;
  cursor: not-allowed;
  transition: background 0.2s, color 0.2s, border-color 0.2s, box-shadow 0.2s;
}
.btn-primary.ready {
  background: var(--accent);
  border-color: transparent;
  color: #fff;
  cursor: pointer;
  box-shadow: 0 4px 18px rgba(92,124,250,0.35);
}
.btn-primary.ready:active { transform: scale(0.96); }

.hint {
  text-align: center;
  color: var(--muted);
  font-size: 12px;
  margin-top: 12px;
}

/* ── Toggle-gruppe ── */
.toggle-group {
  display: flex;
  background: var(--bg);
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--border);
}

.toggle-btn {
  background: transparent;
  color: var(--muted);
  font-size: 13px;
  height: 32px;
  padding: 0 12px;
  border-radius: 0;
  font-weight: 600;
  letter-spacing: 0.3px;
  transition: background 0.15s, color 0.15s;
  font-family: inherit;
}
.toggle-btn.active {
  background: var(--accent);
  color: #fff;
}

/* ── Ohms lov ── */
.ohm-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 16px;
}

.ohm-field {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 14px 10px;
}

.ohm-field label {
  display: block;
  font-size: 10px;
  font-weight: 700;
  color: var(--muted);
  margin-bottom: 6px;
  letter-spacing: 0.8px;
  text-transform: uppercase;
}

.ohm-field .ohm-symbol {
  font-size: 20px;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 4px;
}

.ohm-field input {
  width: 100%;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  font-size: 22px;
  font-weight: 300;
  outline: none;
  padding: 2px 0;
  -webkit-tap-highlight-color: transparent;
}

.ohm-field input::placeholder { color: #2a2f4a; }
.ohm-field.calculated { background: rgba(46,204,113,0.07); border-color: rgba(46,204,113,0.3); }
.ohm-field.calculated input { color: var(--green); }

.ohm-multiplier {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.ohm-multiplier label {
  font-size: 10px;
  font-weight: 700;
  color: var(--muted);
  letter-spacing: 0.8px;
  text-transform: uppercase;
}

.ohm-multiplier input {
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  font-size: 20px;
  font-weight: 300;
  width: 80px;
  text-align: right;
  outline: none;
}

/* ── Kabel og vern ── */
.kabel-form {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 16px;
}

.kabel-row {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.kabel-row label {
  font-size: 12px;
  font-weight: 500;
  color: var(--muted);
  flex-shrink: 0;
}

.kabel-row select {
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 13px;
  border-radius: 8px;
  padding: 6px 8px;
  outline: none;
  max-width: 160px;
  font-family: inherit;
}

.kabel-input-unit {
  display: flex;
  align-items: center;
  gap: 6px;
}

.kabel-input-unit input {
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  font-size: 18px;
  font-weight: 300;
  width: 72px;
  text-align: right;
  outline: none;
  -webkit-tap-highlight-color: transparent;
}

.kabel-input-unit span {
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
}

.kabel-result {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  margin-bottom: 12px;
}

.kabel-result-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.kr-item  { text-align: center; }
.kr-label {
  font-size: 10px;
  font-weight: 700;
  color: var(--muted);
  letter-spacing: 0.8px;
  text-transform: uppercase;
  margin-bottom: 4px;
}
.kr-value { font-size: 26px; font-weight: 300; color: var(--green); }
.kr-unit  { font-size: 12px; color: var(--accent); margin-top: 2px; font-weight: 600; }

.kr-warning {
  margin-top: 12px;
  font-size: 12px;
  color: var(--red);
  line-height: 1.6;
  padding: 10px 14px;
  background: rgba(231,76,60,0.07);
  border-radius: 8px;
  border: 1px solid rgba(231,76,60,0.2);
}

.kabel-utregning-box {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px;
  margin-top: 12px;
}

.kabel-utregning-title {
  font-size: 10px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 10px;
}

.kabel-utregning {
  font-family: 'Courier New', monospace;
  font-size: 11.5px;
  color: var(--muted);
  white-space: pre;
  line-height: 1.7;
  overflow-x: auto;
}

/* ── Felles ── */
.hidden { display: none; }