/* ============================================
   calculator.css — Shared calculator tool styles
   ============================================ */

/* --- Tools intro accordion --- */
.tools-intro {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 48px;
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
}

.tools-intro__item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  grid-template-rows: auto auto;
  gap: 0 16px;
  align-items: center;
  padding: 16px 20px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  width: 100%;
  text-align: left;
  font-family: var(--font);
  color: inherit;
  transition: border-color 0.2s ease;
}

.tools-intro__item:hover {
  border-color: var(--border-hover);
}

.tools-intro__number {
  grid-row: 1;
  grid-column: 1;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent-light);
  background: rgba(124, 58, 237, 0.12);
  border: 1px solid rgba(124, 58, 237, 0.2);
  border-radius: var(--radius-pill);
  padding: 3px 9px;
  white-space: nowrap;
}

.tools-intro__title {
  grid-row: 1;
  grid-column: 2;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.tools-intro__arrow {
  grid-row: 1;
  grid-column: 3;
  color: var(--text-muted);
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

.tools-intro__item[aria-expanded="true"] .tools-intro__arrow {
  transform: rotate(180deg);
}

.tools-intro__text {
  grid-row: 2;
  grid-column: 1 / -1;
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, margin 0.35s ease, opacity 0.25s ease;
  opacity: 0;
  margin-top: 0;
}

.tools-intro__item[aria-expanded="true"] .tools-intro__text {
  max-height: 200px;
  opacity: 1;
  margin-top: 12px;
}

/* --- Tools index cards --- */
.tools-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 48px;
}

@media (min-width: 768px) {
  .tools-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.tool-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: border-color 0.2s ease, transform 0.2s ease;
  text-decoration: none;
  color: inherit;
}

.tool-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
}

.tool-card--blue:hover {
  border-color: #3B82F6;
  box-shadow: 0 8px 32px rgba(59, 130, 246, 0.15);
}

.tool-card--green:hover {
  border-color: #10B981;
  box-shadow: 0 8px 32px rgba(16, 185, 129, 0.15);
}

.tool-card--gold:hover {
  border-color: #F59E0B;
  box-shadow: 0 8px 32px rgba(245, 158, 11, 0.15);
}

.tool-card__icon {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  position: relative;
  transform: perspective(400px) rotateX(8deg) rotateY(-4deg);
  transform-style: preserve-3d;
  transition: transform 0.3s ease;
  box-shadow:
    0 1px 0 rgba(255,255,255,0.25) inset,
    0 -2px 4px rgba(0,0,0,0.4) inset,
    0 8px 20px rgba(0,0,0,0.5),
    0 2px 6px rgba(0,0,0,0.3),
    4px 8px 16px rgba(0,0,0,0.25);
  border: 1px solid rgba(255,255,255,0.15);
}

.tool-card:hover .tool-card__icon {
  transform: perspective(400px) rotateX(2deg) rotateY(-1deg) translateY(-2px) scale(1.05);
}

.tool-card__icon::before {
  content: "";
  position: absolute;
  top: 1px;
  left: 1px;
  right: 1px;
  height: 50%;
  border-radius: 15px 15px 50% 50%;
  background: linear-gradient(180deg, rgba(255,255,255,0.3) 0%, rgba(255,255,255,0.05) 60%, transparent 100%);
  pointer-events: none;
}

.tool-card--blue .tool-card__icon {
  box-shadow:
    0 1px 0 rgba(255,255,255,0.25) inset,
    0 -2px 4px rgba(0,0,0,0.4) inset,
    0 8px 20px rgba(59,130,246,0.3),
    0 2px 6px rgba(0,0,0,0.3),
    4px 8px 16px rgba(59,130,246,0.15);
}

.tool-card--green .tool-card__icon {
  box-shadow:
    0 1px 0 rgba(255,255,255,0.25) inset,
    0 -2px 4px rgba(0,0,0,0.4) inset,
    0 8px 20px rgba(16,185,129,0.3),
    0 2px 6px rgba(0,0,0,0.3),
    4px 8px 16px rgba(16,185,129,0.15);
}

.tool-card--gold .tool-card__icon {
  box-shadow:
    0 1px 0 rgba(255,255,255,0.25) inset,
    0 -2px 4px rgba(0,0,0,0.4) inset,
    0 8px 20px rgba(245,158,11,0.3),
    0 2px 6px rgba(0,0,0,0.3),
    4px 8px 16px rgba(245,158,11,0.15);
}

.tool-card__title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
}

.tool-card__desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  flex: 1;
}

.tool-card__cta {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-light);
  display: flex;
  align-items: center;
  gap: 6px;
}

/* --- How to use section --- */
.calc__howto {
  max-width: 680px;
  margin: 0 auto 40px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
}

.calc__howto-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 28px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-primary);
  font-family: var(--font);
}

.calc__howto-toggle:hover {
  background: rgba(255,255,255,0.02);
  border-radius: var(--radius-md);
}

.calc__howto-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.calc__howto-arrow {
  transition: transform 0.3s ease;
  color: var(--text-muted);
  flex-shrink: 0;
}

.calc__howto.open .calc__howto-arrow {
  transform: rotate(180deg);
}

.calc__howto-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 28px;
}

.calc__howto.open .calc__howto-content {
  max-height: 400px;
  padding: 0 28px 24px;
}

.calc__howto-steps {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-left: 20px;
  margin: 0;
}

.calc__howto-steps li {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  padding-left: 4px;
}

.calc__howto-steps li::marker {
  color: var(--accent-light);
  font-weight: 700;
}

.calc__howto-steps strong {
  color: var(--text-primary);
}

/* --- Calculator layout --- */
.calc {
  max-width: 720px;
  margin: 0 auto;
}

.calc__form {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 32px;
}

.calc__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-bottom: 20px;
}

@media (min-width: 600px) {
  .calc__row--half {
    grid-template-columns: 1fr 1fr;
  }
}

.calc__field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.calc__label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.calc__input {
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.2s ease;
  width: 100%;
}

.calc__input:focus {
  border-color: var(--accent);
}

/* Hide number input spinners */
.calc__input[type="number"]::-webkit-inner-spin-button,
.calc__input[type="number"]::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.calc__input[type="number"] {
  -moz-appearance: textfield;
}

.calc__input::placeholder {
  color: var(--text-muted);
}

.calc__select {
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.2s ease;
  width: 100%;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238E8EA0' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

.calc__select:focus {
  border-color: var(--accent);
}

/* --- Results panel --- */
.calc__results {
  margin-top: 24px;
  background: var(--bg-surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 28px 32px;
  display: none;
}

.calc__results.visible {
  display: block;
  animation: resultsFadeIn 0.3s ease-out;
}

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

.calc__results-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

@media (min-width: 600px) {
  .calc__results-grid--3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

.calc__result-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.calc__result-label {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.calc__result-value {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
}

.calc__result-value--positive {
  color: var(--accent-green);
}

.calc__result-value--negative {
  color: #ef4444;
}

/* --- Calculate button --- */
.calc__btn {
  width: 100%;
  margin-top: 8px;
}

/* --- Loader overlay --- */
.calc__loader {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 40px 0;
}

.calc__loader.active {
  display: flex;
}

.calc__loader-dots {
  display: flex;
  gap: 8px;
}

.calc__loader-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  animation: loaderBounce 1.4s ease-in-out infinite both;
}

.calc__loader-dot:nth-child(1) {
  background: var(--accent-blue);
  animation-delay: 0s;
}

.calc__loader-dot:nth-child(2) {
  background: var(--accent);
  animation-delay: 0.16s;
}

.calc__loader-dot:nth-child(3) {
  background: var(--accent-green);
  animation-delay: 0.32s;
}

.calc__loader-dot:nth-child(4) {
  background: var(--accent-gold);
  animation-delay: 0.48s;
}

.calc__loader-text {
  font-size: 0.82rem;
  color: var(--text-muted);
  animation: loaderTextPulse 2s ease-in-out infinite;
}

@keyframes loaderBounce {
  0%, 80%, 100% { transform: scale(0.4); opacity: 0.3; }
  40% { transform: scale(1); opacity: 1; }
}

@keyframes loaderTextPulse {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}

/* --- Explainer beneath results --- */
.calc__explainer {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.calc__explainer p {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.calc__explainer strong {
  color: var(--text-secondary);
  font-weight: 600;
}

/* --- Disclaimer --- */
.calc__disclaimer {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* --- Calculator page hero --- */
.calc-hero {
  padding-top: 120px;
  padding-bottom: 40px;
  text-align: center;
}

.calc-hero__title {
  font-size: var(--text-section);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.calc-hero__subtitle {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 540px;
  margin: 0 auto;
  line-height: 1.7;
}

/* --- Bottom CTA on calculator pages --- */
.calc-cta {
  text-align: center;
  padding: 64px 0;
}

.calc-cta__title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.calc-cta__subtitle {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 24px;
}