/* ============================================
   ZANOZA FPV CALCULATORS — page-specific styles
   Uses the site's :root tokens from style.css.
   ============================================ */

.fcalc { max-width: 820px; margin: 0 auto; }

/* ---- Back link ---- */
.fcalc-back {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: 'Orbitron', sans-serif; font-size: 0.6rem; font-weight: 700;
  letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted);
  margin-bottom: 28px; transition: color var(--tr);
}
.fcalc-back:hover { color: var(--accent); }
.fcalc-back svg { width: 14px; height: 14px; }

/* ============================================
   HUB — calculator tiles
   ============================================ */
.fcalc-hub {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.fcalc-tile {
  position: relative;
  display: flex; flex-direction: column;
  padding: 28px 26px 24px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--tr);
}
.fcalc-tile::before {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(160deg, rgba(204,0,0,0.10), transparent 55%);
  opacity: 0; transition: opacity var(--tr);
}
.fcalc-tile:hover {
  border-color: rgba(204,0,0,0.35);
  border-left: 2px solid var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.5);
}
.fcalc-tile:hover::before { opacity: 1; }
.fcalc-tile__num {
  position: absolute; top: 10px; right: 16px;
  font-family: 'Orbitron', sans-serif; font-size: 3.2rem; font-weight: 900;
  line-height: 1; color: rgba(255,255,255,0.05);
  transition: color var(--tr);
}
.fcalc-tile:hover .fcalc-tile__num { color: rgba(204,0,0,0.18); }
.fcalc-tile__icon {
  position: relative;
  width: 52px; height: 52px; margin-bottom: 20px;
  display: flex; align-items: center; justify-content: center;
  background: rgba(204,0,0,0.12);
  border: 1px solid rgba(204,0,0,0.3);
  color: var(--accent);
}
.fcalc-tile__icon svg { width: 26px; height: 26px; }
.fcalc-tile__title {
  position: relative;
  font-family: 'Orbitron', sans-serif; font-size: 0.82rem; font-weight: 700;
  letter-spacing: 0.06em; text-transform: uppercase; line-height: 1.3;
  margin-bottom: 12px;
}
.fcalc-tile__desc {
  position: relative;
  color: var(--muted); font-size: 0.98rem; line-height: 1.55; flex: 1;
}
.fcalc-tile__go {
  position: relative;
  display: inline-flex; align-items: center; gap: 8px; margin-top: 20px;
  font-family: 'Orbitron', sans-serif; font-size: 0.6rem; font-weight: 700;
  letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent);
}
.fcalc-tile__go svg { width: 14px; height: 14px; transition: transform var(--tr); }
.fcalc-tile:hover .fcalc-tile__go svg { transform: translateX(4px); }

/* ============================================
   WARNING BANNER + INSTRUCTIONS
   ============================================ */
.fcalc-warn {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 18px; margin-bottom: 20px;
  background: rgba(255,170,0,0.08);
  border: 1px solid rgba(255,170,0,0.35);
  border-left: 3px solid #ffaa00;
  color: #ffc247;
  font-family: 'Orbitron', sans-serif; font-size: 0.72rem; font-weight: 700;
  letter-spacing: 0.06em; text-transform: uppercase; line-height: 1.4;
}
.fcalc-warn svg { width: 22px; height: 22px; flex-shrink: 0; }

.fcalc-info {
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  margin-bottom: 22px; overflow: hidden;
}
.fcalc-info > summary {
  list-style: none; cursor: pointer; padding: 16px 20px;
  display: flex; align-items: center; justify-content: space-between;
  font-family: 'Orbitron', sans-serif; font-size: 0.68rem; font-weight: 700;
  letter-spacing: 0.12em; text-transform: uppercase; color: var(--text);
}
.fcalc-info > summary::-webkit-details-marker { display: none; }
.fcalc-info > summary::after { content: '▾'; color: var(--muted); transition: transform var(--tr); }
.fcalc-info[open] > summary::after { transform: rotate(180deg); }
.fcalc-info__body { padding: 0 20px 20px; color: #c9c9c9; font-size: 1rem; line-height: 1.6; }
.fcalc-info__body p { margin-bottom: 10px; }
.fcalc-info__body b { color: var(--text); }
.fcalc-help {
  margin-top: 14px; padding: 12px 16px;
  background: rgba(204,0,0,0.05);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 0.95rem; color: var(--muted);
}
.fcalc-help b { color: var(--text); }

/* ============================================
   CARDS + FORM
   ============================================ */
.fcalc-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 18px;
}
.fcalc-card h2 {
  font-family: 'Orbitron', sans-serif; font-size: 0.9rem; font-weight: 700;
  letter-spacing: 0.05em; margin-bottom: 6px;
}
.fcalc-section-title {
  font-family: 'Orbitron', sans-serif; font-size: 0.55rem; font-weight: 700;
  letter-spacing: 0.2em; text-transform: uppercase; color: var(--muted);
  margin: 20px 0 12px;
}
.fcalc-field { margin-bottom: 16px; }
.fcalc-field > label {
  display: block; margin-bottom: 8px;
  font-family: 'Orbitron', sans-serif; font-size: 0.52rem; font-weight: 700;
  letter-spacing: 0.18em; text-transform: uppercase; color: var(--muted);
}
.fcalc-input, .fcalc-select {
  width: 100%; padding: 13px 14px;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: 'Rajdhani', sans-serif; font-size: 1.05rem; font-weight: 600;
  outline: none; transition: border-color var(--tr);
}
.fcalc-input:focus, .fcalc-select:focus { border-color: var(--accent); }
.fcalc-select { cursor: pointer; }
.fcalc-select option { background: var(--card); color: var(--text); }

.fcalc-row { display: flex; gap: 14px; }
.fcalc-row > * { flex: 1; min-width: 0; }

.fcalc-card .btn { margin-top: 6px; width: 100%; justify-content: center; }

/* band on/off flags */
.fcalc-flags { display: flex; gap: 10px; flex-wrap: wrap; }
.fcalc-flag {
  display: flex; align-items: center; gap: 8px; cursor: pointer; user-select: none;
  flex: 1; min-width: 130px;
  background: var(--surface); border: 1.5px solid var(--border);
  border-radius: var(--radius); padding: 11px 13px;
  font-family: 'Rajdhani', sans-serif; font-weight: 700; font-size: 1rem;
  transition: border-color var(--tr);
}
.fcalc-flag:hover { border-color: rgba(204,0,0,0.4); }
.fcalc-flag input { width: 18px; height: 18px; flex: 0 0 auto; accent-color: var(--accent); cursor: pointer; }
.fcalc-flag__hint { color: var(--muted); font-weight: 500; font-size: 0.85rem; }

/* drone rows (calc 1) */
.fcalc-drone-row { display: flex; align-items: center; gap: 12px; margin-bottom: 10px; }
.fcalc-drone-row .fcalc-tag {
  flex: 0 0 auto; min-width: 74px;
  font-family: 'Orbitron', sans-serif; font-size: 0.58rem; font-weight: 700;
  letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted);
}
.fcalc-drone-row .fcalc-select { flex: 1; }

/* ============================================
   RESULTS — metric, chips, badges, spectrum
   ============================================ */
.fcalc-metric { display: flex; align-items: baseline; flex-wrap: wrap; gap: 6px 14px; margin-bottom: 6px; }
.fcalc-metric__val {
  font-family: 'Orbitron', sans-serif; font-size: 2.4rem; font-weight: 900;
  color: #fff; text-shadow: 0 0 24px rgba(204,0,0,0.45); line-height: 1;
}
.fcalc-metric__label { color: var(--muted); font-size: 0.98rem; }

.fcalc-badge {
  display: inline-block; padding: 4px 12px; border-radius: 2px;
  font-family: 'Orbitron', sans-serif; font-size: 0.55rem; font-weight: 700;
  letter-spacing: 0.1em; text-transform: uppercase;
}
.fcalc-badge--ok { background: var(--green-dim); color: var(--green); border: 1px solid rgba(0,255,136,0.4); }
.fcalc-badge--warn { background: rgba(255,170,0,0.14); color: #ffb638; border: 1px solid rgba(255,170,0,0.4); }
.fcalc-badge--bad { background: rgba(204,0,0,0.15); color: #ff6a6a; border: 1px solid rgba(204,0,0,0.45); }

.fcalc-chan-list { display: flex; flex-wrap: wrap; gap: 8px; }
.fcalc-chip {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 7px 12px; border-radius: var(--radius);
  border: 1px solid var(--border); background: rgba(255,255,255,0.04);
  font-family: 'Orbitron', sans-serif; font-size: 0.72rem; font-weight: 700;
  letter-spacing: 0.03em;
}
.fcalc-chip .fcalc-freq { color: var(--muted); font-family: 'Rajdhani', sans-serif; font-weight: 600; font-size: 0.9rem; letter-spacing: 0; }
.fcalc-chip--good { background: var(--green-dim); border-color: rgba(0,255,136,0.35); color: #7ee2a0; }
.fcalc-chip--bad { background: rgba(204,0,0,0.13); border-color: rgba(204,0,0,0.4); color: #ff8f8f; }
.fcalc-chip--fixed { background: rgba(74,158,255,0.13); border-color: rgba(74,158,255,0.4); color: #a9d0ff; }
.fcalc-chip--auto { background: rgba(255,59,59,0.13); border-color: rgba(255,59,59,0.4); color: #ff9a9a; }
.fcalc-chip--good .fcalc-freq, .fcalc-chip--bad .fcalc-freq,
.fcalc-chip--fixed .fcalc-freq, .fcalc-chip--auto .fcalc-freq { color: inherit; opacity: 0.7; }

.fcalc-muted { color: var(--muted); font-size: 0.9rem; margin-bottom: 10px; }
.fcalc-empty { color: var(--muted); font-size: 0.98rem; padding: 4px 0; }

.fcalc-spectrum-wrap { width: 100%; overflow: hidden; }
.fcalc-spectrum { width: 100%; height: 160px; display: block; }
.fcalc-legend { display: flex; flex-wrap: wrap; gap: 18px; margin-top: 12px; font-size: 0.9rem; color: var(--muted); }
.fcalc-legend span { display: inline-flex; align-items: center; gap: 7px; }
.fcalc-legend i { width: 12px; height: 12px; border-radius: 2px; display: inline-block; }

.fcalc-result:empty { display: none; }
.fcalc-result { margin-top: 20px; }

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 860px) {
  .fcalc-hub { grid-template-columns: 1fr; gap: 16px; }
  .fcalc-tile { padding: 24px 22px; }
}
@media (max-width: 560px) {
  .fcalc-card { padding: 18px 16px; }
  .fcalc-row { flex-direction: column; gap: 0; }
  .fcalc-metric__val { font-size: 2rem; }
  .fcalc-flag { min-width: 0; }
  .fcalc-tile__num { font-size: 2.6rem; }
}