/* ============================================================
   CALCULATOR COMPONENT — Reusable CSS
   A single generic card component for all calculators.
   Mobile-first (320px+). Uses Vitals design tokens from :root.
   ============================================================ */

/* ── CARD ─────────────────────────────────────────────────── */

.calc-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
  overflow: hidden;
  width: 100%;
  max-width: var(--max-w);
}

/* ── HEADER ───────────────────────────────────────────────── */

.calc-card-header {
  padding: 24px 28px 20px;
  border-bottom: 1px solid var(--border);
}

.calc-card-title {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.3;
  color: var(--text);
  margin: 0;
}

.calc-card-description {
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 4px;
  line-height: 1.45;
}

/* ── BODY (form area) ─────────────────────────────────────── */

.calc-card-body {
  padding: 24px 28px;
}

/* ── FORM LAYOUT ──────────────────────────────────────────── */

.calc-form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 18px;
}

.calc-form-row:last-child {
  margin-bottom: 0;
}

.calc-form-row > .calc-form-group {
  margin-bottom: 0;
}

.calc-form-group {
  margin-bottom: 18px;
}

.calc-form-group:last-child {
  margin-bottom: 0;
}

/* ── LABELS ───────────────────────────────────────────────── */

.calc-label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 6px;
  letter-spacing: 0.01em;
}

/* ── INPUTS ───────────────────────────────────────────────── */

.calc-input {
  width: 100%;
  padding: 10px 14px;
  font-family: var(--font);
  font-size: 15px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-alt);
  color: var(--text);
  outline: none;
  transition: border-color 0.15s, background 0.15s, box-shadow 0.15s;
}

.calc-input::placeholder {
  color: var(--text-faint);
}

/* Focus state */
.calc-input:focus {
  border-color: var(--accent);
  background: var(--surface);
  box-shadow: 0 0 0 3px var(--accent-bg);
}

/* Disabled state */
.calc-input:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

/* ── DROPDOWNS (select) ───────────────────────────────────── */

select.calc-input {
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' fill='none'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%236b6b65' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 32px;
  cursor: pointer;
}

/* ── BUTTONS ──────────────────────────────────────────────── */

.calc-btn-primary {
  margin-top: 24px;
  width: 100%;
  padding: 13px 20px;
  background: var(--accent);
  color: #fff;
  font-family: var(--font);
  font-size: 15px;
  font-weight: 600;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  letter-spacing: -0.01em;
  transition: background 0.15s;
}

.calc-btn-primary:hover {
  background: var(--accent-hover);
}

.calc-btn-primary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.calc-btn-primary:active {
  transform: scale(0.99);
}

.calc-btn-primary:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.calc-btn-secondary {
  margin-top: 10px;
  width: 100%;
  padding: 11px 20px;
  background: none;
  color: var(--text-muted);
  font-family: var(--font);
  font-size: 14px;
  font-weight: 500;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s, background 0.15s;
}

.calc-btn-secondary:hover {
  border-color: var(--border-strong);
  color: var(--text);
  background: var(--surface-alt);
}

.calc-btn-secondary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ── RESULT CONTAINER ─────────────────────────────────────── */

.calc-result[hidden] {
  display: none;
}

/* ── ERROR STYLES ─────────────────────────────────────────── */

.calc-error {
  color: #d32f2f; /* Material error red */
  font-size: 14px;
  margin-top: 4px;
}

/* ── RESPONSIVE — mobile-first (320px+) ───────────────────── */

@media (max-width: 480px) {
  .calc-form-row {
    grid-template-columns: 1fr;
  }

  .calc-card-header {
    padding: 20px 18px 16px;
  }

  .calc-card-body {
    padding: 20px 18px;
  }

  .calc-card-title {
    font-size: 18px;
  }

  .calc-card-description {
    font-size: 13px;
  }

  .calc-btn-primary {
    padding: 12px 16px;
    font-size: 14px;
  }

  .calc-btn-secondary {
    padding: 10px 16px;
    font-size: 13px;
  }
}

@media (max-width: 360px) {
  .calc-card-header {
    padding: 16px 14px 14px;
  }

  .calc-card-body {
    padding: 16px 14px;
  }

  .calc-card-title {
    font-size: 17px;
  }

  .calc-input {
    padding: 9px 12px;
    font-size: 14px;
  }

  select.calc-input {
    padding-right: 30px;
  }
}

.calc-info {
  padding: 16px 0 4px;
  border-top: 1px solid var(--border);
  margin-top: 16px;
}
.calc-info h3 {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.calc-info p {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 8px;
}
.calc-info p:last-child { margin-bottom: 0; }