/* ═══════════════════════════════════════════════════════════
   Calculator Yến Mạch Giảm Cân — mobile-first
   Palette: primary #3B7A57 | accent #F4A261 | bg #FAFAF5 | text #2C3E2D
   ═══════════════════════════════════════════════════════════ */

.yenmach-calculator {
  --calc-primary: #3B7A57;
  --calc-accent:  #F4A261;
  --calc-bg:      #FAFAF5;
  --calc-card:    #ffffff;
  --calc-text:    #2C3E2D;
  --calc-muted:   #8B9A87;
  --calc-border:  #d9e5d6;
  --calc-red:     #d9534f;
  --calc-radius:  10px;
  --calc-shadow:  0 2px 12px rgba(59,122,87,.10);

  font-family: 'Inter', sans-serif;
  color: var(--calc-text);
  background: var(--calc-bg);
  border: 1px solid var(--calc-border);
  border-radius: var(--calc-radius);
  padding: 1.5rem;
  margin: 2rem 0;
  box-shadow: var(--calc-shadow);
}

/* ── Heading ─────────────────────────────────────────────── */
.calc-heading {
  font-family: 'Fraunces', serif;
  font-size: 1.25rem;
  color: var(--calc-primary);
  margin: 0 0 1.25rem;
}

/* ── Form ────────────────────────────────────────────────── */
.calc-form {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

@media (min-width: 600px) {
  .calc-form {
    grid-template-columns: 1fr 1fr;
  }
  .calc-field-slider {
    grid-column: 1 / -1;
  }
}

.calc-field {
  display: flex;
  flex-direction: column;
  gap: .35rem;
}

.calc-field label {
  font-size: .875rem;
  font-weight: 600;
  color: var(--calc-text);
}

.calc-field input[type="number"],
.calc-field select {
  padding: .55rem .75rem;
  border: 1.5px solid var(--calc-border);
  border-radius: 6px;
  font-size: .95rem;
  font-family: inherit;
  color: var(--calc-text);
  background: #fff;
  transition: border-color .2s;
  -webkit-appearance: none;
  appearance: none;
}

.calc-field input[type="number"]:focus,
.calc-field select:focus {
  outline: none;
  border-color: var(--calc-primary);
}

.calc-field input.invalid {
  border-color: var(--calc-red);
  background: #fff8f8;
}

.calc-hint {
  font-size: .75rem;
  color: var(--calc-muted);
}

/* — Radio group — */
.calc-radio-group {
  display: flex;
  gap: 1rem;
  padding-top: .2rem;
}

.calc-radio {
  display: flex;
  align-items: center;
  gap: .4rem;
  cursor: pointer;
  font-size: .95rem;
  font-weight: 400;
}

.calc-radio input[type="radio"] {
  accent-color: var(--calc-primary);
  width: 16px;
  height: 16px;
  cursor: pointer;
}

/* — Slider — */
.calc-field-slider label {
  margin-bottom: .3rem;
}

.calc-field-slider input[type="range"] {
  width: 100%;
  accent-color: var(--calc-primary);
  cursor: pointer;
  height: 6px;
}

.calc-slider-ticks {
  display: flex;
  justify-content: space-between;
  font-size: .7rem;
  color: var(--calc-muted);
  margin-top: .25rem;
}

/* — Note — */
.calc-note {
  font-size: .8rem;
  color: var(--calc-muted);
  font-style: italic;
  margin: 1rem 0 0;
  border-left: 3px solid var(--calc-border);
  padding-left: .75rem;
}

/* ── Submit button ───────────────────────────────────────── */
.calc-submit-wrap {
  margin-top: 1.25rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .5rem;
}

.calc-helper-text {
  font-size: .82rem;
  color: var(--calc-muted);
  margin: 0;
  text-align: center;
}

.calc-submit {
  display: block;
  width: 100%;
  padding: .875rem 1.75rem;
  background: var(--calc-primary);
  color: #FAFAF5;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: 999px;
  cursor: pointer;
  transition: background .2s, transform .1s;
  letter-spacing: .02em;
}

@media (min-width: 480px) {
  .calc-submit {
    width: auto;
    min-width: 220px;
  }
}

.calc-submit:hover {
  background: #2C5F42;
}

.calc-submit:active {
  transform: scale(.98);
}

/* ── Change notice ───────────────────────────────────────── */
.calc-change-notice {
  margin-top: .75rem;
  padding: .5rem .875rem;
  background: #fff8e1;
  border: 1px solid #ffe082;
  border-radius: 6px;
  font-size: .82rem;
  color: #7a5c00;
  text-align: center;
}

/* ── Results (slide-down) ────────────────────────────────── */
.calc-results {
  margin-top: 1.5rem;
  animation: calcSlideDown .35s ease both;
}

@keyframes calcSlideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* — Warning — */
.calc-warning {
  background: #fff3cd;
  border: 1px solid #ffc107;
  border-radius: 6px;
  padding: .75rem 1rem;
  font-size: .875rem;
  color: #856404;
  margin-bottom: 1rem;
}

/* — Sections — */
.calc-section {
  background: var(--calc-card);
  border: 1px solid var(--calc-border);
  border-radius: var(--calc-radius);
  padding: 1rem;
  margin-bottom: .75rem;
}

.calc-section-title {
  font-size: .95rem;
  font-weight: 700;
  color: var(--calc-primary);
  margin: 0 0 .75rem;
}

.calc-result-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: .5rem;
  padding: .3rem 0;
  border-bottom: 1px solid #f0f4f0;
  font-size: .875rem;
}

.calc-result-row:last-child {
  border-bottom: none;
}

.calc-result-label {
  color: var(--calc-muted);
  flex-shrink: 0;
}

.calc-result-value {
  font-weight: 600;
  text-align: right;
}

.calc-result-value.highlight {
  color: var(--calc-primary);
  font-size: 1rem;
}

/* — Actions — */
.calc-actions {
  display: flex;
  gap: .75rem;
  flex-wrap: wrap;
  margin: 1rem 0;
}

.calc-btn-secondary {
  padding: .5rem 1.25rem;
  border: 1.5px solid var(--calc-primary);
  border-radius: 50px;
  background: transparent;
  color: var(--calc-primary);
  font-size: .875rem;
  font-family: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: background .2s, color .2s;
}

.calc-btn-secondary:hover {
  background: var(--calc-primary);
  color: #fff;
}

/* — Products — */
.calc-products {
  margin-top: .5rem;
}

.calc-products-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: .75rem;
  margin-top: .75rem;
}

@media (min-width: 480px) {
  .calc-products-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.calc-product-card {
  background: var(--calc-card);
  border: 1px solid var(--calc-border);
  border-radius: var(--calc-radius);
  padding: .75rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .5rem;
  text-align: center;
}

@media (max-width: 479px) {
  .calc-product-card {
    flex-direction: row;
    text-align: left;
    align-items: flex-start;
  }
}

.calc-product-card img {
  width: 80px;
  height: 80px;
  object-fit: cover;
  border-radius: 6px;
  flex-shrink: 0;
}

.calc-product-info {
  display: flex;
  flex-direction: column;
  gap: .3rem;
  width: 100%;
}

.calc-product-name {
  font-size: .78rem;
  font-weight: 600;
  color: var(--calc-text);
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.calc-product-price {
  font-size: .875rem;
  font-weight: 700;
  color: var(--calc-primary);
  margin: 0;
}

.calc-product-btn {
  font-size: .78rem !important;
  padding: .4rem .75rem !important;
  width: 100%;
  text-align: center;
  display: block;
}

/* — Disclaimer — */
.calc-disclaimer {
  margin-top: 1rem;
  padding: .75rem 1rem;
  background: #f8f9fa;
  border-radius: 6px;
  font-size: .78rem;
  color: var(--calc-muted);
  border-left: 3px solid var(--calc-border);
}

.calc-disclaimer p {
  margin: 0;
}

/* ── Page-specific layout ────────────────────────────────── */
.calc-page-intro {
  max-width: 680px;
  margin: 0 auto 1rem;
  font-size: 1.05rem;
  color: var(--calc-text);
  line-height: 1.7;
}

.calc-page-links {
  margin: 2rem 0;
  padding: 1.25rem 1.5rem;
  background: var(--calc-bg);
  border: 1px solid var(--calc-border);
  border-radius: var(--calc-radius);
}

.calc-page-links h3 {
  font-size: .95rem;
  color: var(--calc-primary);
  margin: 0 0 .75rem;
}

.calc-page-links ul {
  margin: 0;
  padding-left: 1.25rem;
}

.calc-page-links li {
  margin-bottom: .4rem;
  font-size: .9rem;
}

.calc-page-links a {
  color: var(--calc-primary);
  text-decoration: none;
}

.calc-page-links a:hover {
  text-decoration: underline;
}