/* ===============================
   🎨 GLOBAL VARIABLES
================================ */
:root {
  --bg-light: #f0f4f8;
  --bg-white: #ffffff;
  --text-dark: #333333;
  --text-muted: #777777;
  --accent-blue: #2c3e50;
  --accent-orange: #e67e22;
  --accent-hover: #d35400;
  --accent-charcoal: #333333;
}

/* ===============================
   🔹 LANDING PAGE
================================ */
.calculator-landing {
  text-align: center;
  background-color: var(--bg-white);
  padding: 2rem;
}

.calculator-grid {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.calculator-box {
  background: var(--bg-white);
  border: 1px solid #ccc;              /* Normal border for all sides */
  border-top: 4px solid transparent;   /* Thicker top edge (transparent by default) */
  border-radius: 8px;
  padding: 1.5rem;
  width: 280px;
  color: inherit;
  text-decoration: none;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
  transition: all 0.25s ease;
}

.calculator-box:hover {
  transform: translateY(-4px);
  border-top-color: #ff7a00; /* 🟠 Only top border turns orange */
  box-shadow: 0 6px 14px rgba(255, 122, 0, 0.25);
}

.calculator-box h3 {
  margin-bottom: 0.5rem;
  color: var(--accent-blue);
  transition: color 0.2s ease;
}

.calculator-box:hover h3 {
  color: #ff7a00; /* optional: title turns orange on hover */
}

.calculator-box p {
  font-size: 0.9rem;
  color: var(--text-dark);
}


/* 🔹 Calculator Section */
.calculator-section {
  background-color: var(--bg-white);
  padding: 2rem;
  border-radius: 8px;
  max-width: 1200px;
  margin: 0 auto; /* ✅ This centers it */
  overflow-x: auto;
  display: none;
}


.calculator-section.active {
  display: block;
}

.calculator-section h2 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  text-align: center;
  color: var(--accent-blue);
}

/* 🔢 Grid Layouts */
#tmtRows .calculator-row,
#tmt-calculator .calculator-footer,
#tmt-calculator .calculator-header {
  display: grid;
  grid-template-columns: repeat(10, 0.7fr);
  gap: 1rem;
  margin-bottom: 1rem;
  align-items: end;
}

#msPipeRows .calculator-row,
#ms-pipe-calculator .calculator-footer,
#ms-pipe-calculator .calculator-header {
  display: grid;
  grid-template-columns: repeat(11, 0.7fr);
  gap: 1rem;
  margin-bottom: 1rem;
  align-items: end;
}

#msSquarePipeRows .calculator-row,
#ms-square-pipe-calculator .calculator-footer,
#ms-square-pipe-calculator .calculator-header {
  display: grid;
  grid-template-columns: repeat(12, 0.7fr);
  gap: 1rem;
  margin-bottom: 1rem;
  align-items: end;
}

#msChannelRows .calculator-row,
#ms-channel-calculator .calculator-footer,
#ms-channel-calculator .calculator-header {
  display: grid;
    grid-template-columns:
    repeat(9, 0.5fr)   /* First 9 smaller columns */
    repeat(5, 0.7fr);    /* Last 5 larger columns */
  gap: 1rem;
  margin-bottom: 1rem;
  align-items: end;
}

#msAngleRows .calculator-row,
#ms-angle-calculator .calculator-footer,
#ms-angle-calculator .calculator-header {
  display: grid;
  grid-template-columns: repeat(12, 0.7fr);
  gap: 1rem;
  margin-bottom: 1rem;
  align-items: end;
}

#msRoundBarRows .calculator-row,
#ms-round-bar-calculator .calculator-footer,
#ms-round-bar-calculator .calculator-header{
  display: grid;
  grid-template-columns: repeat(10, 0.8fr);
  gap: 1rem;
  margin-bottom: 1rem;
  align-items: end;
}

/* 🏷️ Column Labels */
.calculator-header label {
  display: flex;
  flex-direction: column;
  font-weight: 500;
  color: var(--text-dark);
  text-align: center;
}

/* 🧮 Inputs and Buttons */
.calculator-row input[type="number"],
.calculator-row input[type="text"],
.calculator-footer input[type="text"],
.calculator-row button,
.calculator-footer button {
  padding: 0.5rem;
  margin-top: 0.25rem;
  font-size: 1rem;
  border-radius: 4px;
  border: 1px solid #ccc;
  height: 40px;
  box-sizing: border-box;
  background-color: var(--bg-white);
  color: var(--text-dark);
  width: 100%;
}

input:focus,
button:focus {
  outline: 2px solid var(--accent-orange);
  outline-offset: 2px;
}

/* ➕➖ Row Actions */
.row-actions {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
  align-items: center;
}

.add-row-btn,
.delete-row-btn {
  border: none;
  border-radius: 50%;
  font-size: 1.2rem;
  height: 40px;
  width: 40px;
  cursor: pointer;
  color: var(--bg-white);
}

.add-row-btn {
  background-color: var(--accent-blue);
}

.add-row-btn:hover {
  background-color: var(--accent-hover);
}

.add-row-btn:disabled {
  background-color: #ccc;
  cursor: not-allowed;
}

.delete-row-btn {
  background-color: var(--accent-orange);
}

.delete-row-btn:hover {
  background-color: var(--accent-hover);
}

/* 🧮 Calculate Buttons */
#calculateBtn,
#pipeCalculateBtn {
  background-color: var(--accent-orange);
  color: var(--bg-white);
  border: none;
  padding: 0.5rem 1rem;
  font-size: 1rem;
  border-radius: 4px;
  cursor: pointer;
}

#calculateBtn:hover,
#pipeCalculateBtn:hover {
  background-color: var(--accent-hover);
}

/* ===============================
   🧾 INTRO SECTION
================================ */
.intro {
  max-width: 1200px;
  margin: 0 auto 2rem;
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-dark);
  text-align: left;
  margin-top: 2rem;
}

.intro strong {
  color: var(--accent-blue);
  font-weight: 700;
}

.intro a {
  color: var(--accent-orange);
  font-weight: 600;
  text-decoration: underline;
  transition: color 0.2s ease;
}

.intro a:hover {
  color: var(--accent-hover);
}

/* ===============================
   💬 FORMULA NOTE
================================ */
.formula-note {
  margin-top: 2rem;
  font-size: 0.95rem;
  text-align: center;
  color: var(--text-muted);
}

/* ===============================
   🔗 CTA LINKS
================================ */
.cta-link {
  color: var(--accent-orange);
  font-weight: 500;
  text-decoration: underline;
  transition: color 0.2s ease;
}
.cta-link:hover {
  color: var(--accent-hover);
}

/* ===============================
   📘 CALCULATOR INFO
================================ */
.calculator-info {
  max-width: 1200px;
  margin: 3rem auto;
  padding: 0 1rem;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-dark);
}

.calculator-info h2,
.calculator-info h3 {
  color: var(--accent-blue);
  margin-top: 2rem;
}

.calculator-info ul {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

.calculator-info p {
  margin-bottom: 1rem;
}

/* ===============================
   🤝 RELATED INLINE CALCULATORS
================================ */
.related-inline {
  max-width: 1100px;
  margin: 2rem auto 0;
  padding: 1rem 1.5rem;
  background: #f9fafc;
  border-left: 4px solid var(--accent-hover);
  border-radius: 6px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.04);
  font-size: 1rem;
  line-height: 1.6;
}

.related-inline a {
  color: var(--accent-orange);
  font-weight: 600;
  text-decoration: none;
}
.related-inline a:hover {
  text-decoration: underline;
  color: var(--accent-hover);
}

/* ===============================
   📋 SPEC TABLE (Hidden Titles)
================================ */
.spec-section h2,
.spec-note {
  display: none;
}

.spec-table {
  max-width: 1000px;
  font-size: 0.75rem;
  border-collapse: collapse;
  table-layout: fixed;
  font-family: 'Poppins', sans-serif;
}

.spec-table th,
.spec-table td {
  padding: 0.6rem;
  border: 1px solid #ccc;
  text-align: left;
}

.spec-table thead th {
  position: sticky;
  top: 0;
  background: #f5f7fa;
  color: var(--text-dark);
  z-index: 2;
}

.spec-table tbody tr:nth-child(even) {
  background: #f9fbfc;
}
.spec-table tbody tr:hover {
  background: #eef2f6;
  transition: background-color 0.3s ease;
}

/* ===============================
   ❓ FAQ SECTION
================================ */
.faq-box {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;              /* ✅ Adds space between FAQ items */
}

.faq-item {
  width: 100%;
}

.faq-wrapper {
  display: flex;
  flex-direction: column;
  gap: 0;                    /* ✅ No space between question and answer */
  width: 100%;
}

.faq-question,
.faq-answer {
  display: block;
  width: 100%;
  box-sizing: border-box;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  margin: 0;
  border-radius: 0;
}

/* FAQ Question */
.faq-question {
  font-weight: 600;
  background-color: var(--accent-orange);
  color: var(--bg-white);
  border: 1px solid #ddd;
  border-bottom: none;
  border-radius: 4px 4px 0 0;
}

/* FAQ Answer */
.faq-answer {
  background-color: var(--bg-light);
  color: var(--text-muted);
  border: 1px solid #ddd;
  border-top: none;
  border-radius: 0 0 4px 4px;
}

/* ===============================
   📞 CONTACT FORM
================================ */
.get-in-touch {
  background: var(--bg-white);
  padding: 60px 20px;
}

.touch-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 40px;
  max-width: 1300px;
  margin: 0 auto;
  padding: 40px;
  background: var(--bg-white);
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.touch-info,
.touch-form {
  flex: 1;
  min-width: 280px;
}

.touch-info h2 {
  font-size: 32px;
  margin-bottom: 10px;
  color: var(--accent-blue);
}

.touch-info .highlight {
  color: var(--accent-orange);
}

.touch-info p,
.touch-info ul {
  color: var(--text-muted);
  font-size: 16px;
  margin-bottom: 20px;
}

.touch-info li {
  margin-bottom: 10px;
}

.touch-form {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.touch-form input,
.touch-form textarea {
  padding: 10px;
  border: 1px solid #ccc;
  border-radius: 6px;
  font-size: 14px;
}

.touch-form button {
  background: var(--accent-orange);
  color: white;
  border: none;
  padding: 12px;
  border-radius: 6px;
  font-weight: bold;
  cursor: pointer;
  transition: background 0.3s ease;
}
.touch-form button:hover {
  background: var(--accent-hover);
}

/* ===============================
   📮 POPUP OVERLAY
================================ */
.popup-overlay {
  display: none;
  justify-content: center;
}

/* ===============================
   ⚙️ FOOTER
================================ */
footer {
  background: #2c3e50;
  color: white;
  text-align: center;
  padding: 20px;
}

/* ===== Breadcrumb Styling ===== */
.breadcrumb {
  display: none;
}

/* ===== MEDIA: Mobile Layout ===== */
@media (max-width: 768px) {
  /* Hide desktop layout */
  #tmtRows,
  #msAngleRows,
  #msRoundBarRows,
  #msPipeRows,
  #msSquarePipeRows,
  #msChannelRows,
  .calculator-footer,
  #calculateBtn {
    display: none !important;
  }

  /* Mobile container */
  #mobileCalculator {
    display: block;
    overflow-x: auto;
    margin-top: 1.5rem;
    padding: 1rem;
    background-color: var(--bg-white);
    border-radius: 6px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
    transition: box-shadow 0.3s ease;
  }

  /* Transposed rows */
  .mobile-row {
    display: grid;
    grid-template-columns: repeat(6, 80px);
    gap: 0.25rem;
    padding: 0.4rem 0;
    border-bottom: 1px solid #eee;
    min-width: 100%;
    animation: fadeIn 0.3s ease;
  }

  /* Label, total, and input cells */
  .mobile-label,
  .mobile-total,
  .box-cell,
  .mobile-cell {
    height: 36px;
    font-size: 0.85rem;
    text-align: center;
    white-space: nowrap;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    box-sizing: border-box;
    transition: background-color 0.3s ease, border-color 0.3s ease;
  }

  .mobile-label {
    font-weight: 500;
    color: var(--accent-blue);
    background-color: var(--bg-white);
    border: 1px solid #ccc;
    padding: 0.4rem;
  }

  .mobile-total {
    font-weight: 600;
    color: var(--accent-orange);
    background-color: var(--bg-white);
    border: 1px solid #ccc;
    padding: 0.4rem;
  }

  .mobile-cell {
    color: var(--text-dark);
  }

  .mobile-cell input {
    width: 100%;
    height: 32px;
    padding: 0.3rem;
    font-size: 0.85rem;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
  }

  .mobile-cell input:focus {
    border-color: var(--accent-orange);
    box-shadow: 0 0 4px rgba(230, 126, 34, 0.4);
  }

  /* Box-style buttons */
  .box-btn {
    width: 32px;
    height: 32px;
    font-size: 0.85rem;
    padding: 0.3rem 0.6rem;
    border: 1px solid #ccc;
    border-radius: 4px;
    background-color: var(--accent-blue);
    color: var(--bg-white);
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
  }

  .box-btn:hover {
    background-color: var(--accent-hover);
    transform: scale(1.05);
  }

  .delete-row-btn.box-btn {
    background-color: var(--accent-orange);
  }

  .delete-row-btn.box-btn:hover {
    background-color: var(--accent-hover);
  }

  /* Mobile stacked layout */
  .calculator-row {
    display: grid;
    grid-template-columns: 1fr 1fr auto;
    gap: 1rem;
    padding: 1rem;
    margin-bottom: 1rem;
    border: 1px solid #eee;
    border-radius: 6px;
    background-color: var(--bg-white);
  }

  .calc-col {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
  }

  .calc-col label {
    font-size: 0.85rem;
    color: var(--text-dark);
  }

  .calc-col input {
    width: 100%;
    font-size: 1rem;
    padding: 0.5rem;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
  }

  .action-col {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .row-actions {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
  }

  .add-row-btn,
  .delete-row-btn {
    width: 40px;
    height: 40px;
    font-size: 1.2rem;
    border-radius: 50%;
    border: none;
    color: var(--bg-white);
    cursor: pointer;
  }

  .add-row-btn {
    background-color: var(--accent-blue);
  }

  .delete-row-btn {
    background-color: var(--accent-orange);
  }

  .add-row-btn:hover,
  .delete-row-btn:hover {
    background-color: var(--accent-hover);
  }

  /* Animations */
  @keyframes fadeIn {
    from {
      opacity: 0;
      transform: translateY(4px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
}
/* ===============================
   📱 RESPONSIVE (Mobile)
================================ */
@media (max-width: 768px) {
  .intro {
    padding: 1rem;
    margin: 0 1rem 1.5rem;
    font-size: 0.95rem;
  }

  .related-inline {
    margin: 1.5rem 1rem 0;
    padding: 1rem;
    font-size: 0.95rem;
  }

  .breadcrumb {
    display: block;
    padding: 16px 24px;
    margin: 20px auto;
    background: var(--bg-light);
    border-radius: 8px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.05);
    font-size: 14px;
  }

  .breadcrumb-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    list-style: none;
    margin: 0;
    padding: 0;
  }

  .breadcrumb-list li:not(:last-child)::after {
    content: "/";
    margin: 0 8px;
    color: var(--accent-blue);
  }

  .breadcrumb-list a {
    color: var(--accent-orange);
    text-decoration: none;
    padding: 6px 10px;
    border-radius: 6px;
    transition: color 0.3s ease;
  }
}