/* =============================================
   CLCU Online – Tool Pages Stylesheet
   ============================================= */

/* ── Breadcrumb ── */
.breadcrumb-bar { background: var(--light); border-bottom: 1px solid var(--border); padding: .6rem 0; }
.breadcrumb { font-size: .82rem; color: var(--gray); }
.breadcrumb a { color: var(--gray); }
.breadcrumb a:hover { color: var(--primary); text-decoration: none; }
.breadcrumb .sep { margin: 0 .4rem; }

/* ── Tool Layout ── */
.tool-main { padding: 2.5rem 0 4rem; }
.tool-layout { display: grid; grid-template-columns: 1fr 300px; gap: 2.5rem; align-items: start; }

/* ── Tool Header ── */
.tool-header { margin-bottom: 1.75rem; }
.tool-header h1 { font-size: clamp(1.6rem, 3.5vw, 2.25rem); font-weight: 800; margin-bottom: .5rem; letter-spacing: -.3px; line-height: 1.2; }
.tool-header .tool-desc { color: var(--gray); font-size: 1rem; line-height: 1.7; }

/* ── Calculator Box ── */
.calculator-box {
  background: var(--white);
  border: 2px solid var(--primary);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  margin-bottom: 2.5rem;
  box-shadow: var(--shadow-md);
}
.calc-title { font-size: 1rem; font-weight: 700; color: var(--primary); margin-bottom: 1.25rem; display: flex; align-items: center; gap: .5rem; }
.calc-title::before { content: "🔢"; font-size: 1.1rem; }

/* Input Groups */
.input-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 1rem; margin-bottom: 1.25rem; }
.input-group { display: flex; flex-direction: column; gap: .4rem; }
.input-group label { font-size: .82rem; font-weight: 600; color: var(--dark); }
.input-group input, .input-group select {
  padding: .65rem .85rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: .95rem;
  color: var(--dark);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
  background: var(--white);
  width: 100%;
}
.input-group input:focus, .input-group select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,.1);
}
.unit-toggle { display: flex; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border); width: fit-content; margin-bottom: .85rem; }
.unit-btn {
  padding: .35rem .85rem;
  font-size: .8rem;
  font-weight: 600;
  background: var(--white);
  border: none;
  color: var(--gray);
  cursor: pointer;
  transition: all var(--transition);
}
.unit-btn.active { background: var(--primary); color: var(--white); }

/* Double-height input area (for courses etc.) */
.calc-rows { display: flex; flex-direction: column; gap: .6rem; margin-bottom: 1rem; }
.calc-row { display: flex; gap: .6rem; align-items: center; }
.calc-row input, .calc-row select { flex: 1; }
.calc-row .btn-remove { background: none; border: 1px solid #fca5a5; border-radius: 4px; color: #ef4444; padding: .3rem .55rem; font-size: .85rem; }
.calc-row .btn-remove:hover { background: #fef2f2; }
.btn-add-row { background: none; border: 1px dashed var(--primary); border-radius: var(--radius); color: var(--primary); padding: .5rem 1rem; font-size: .85rem; font-weight: 600; width: 100%; margin-bottom: 1rem; transition: all var(--transition); }
.btn-add-row:hover { background: var(--primary-lt); }

/* Calculate button */
.btn-calc {
  background: var(--primary);
  color: var(--white);
  border: none;
  border-radius: var(--radius);
  padding: .85rem 2rem;
  font-size: 1rem;
  font-weight: 700;
  width: 100%;
  transition: background var(--transition), transform var(--transition);
  letter-spacing: .01em;
}
.btn-calc:hover { background: var(--primary-dk); transform: translateY(-1px); }
.btn-calc:active { transform: translateY(0); }

/* Results */
.calc-results {
  margin-top: 1.25rem;
  background: var(--primary-lt);
  border: 1px solid #bfdbfe;
  border-radius: var(--radius);
  padding: 1.25rem;
}
.result-main { font-size: 2rem; font-weight: 800; color: var(--primary); margin-bottom: .25rem; line-height: 1; }
.result-label { font-size: .82rem; color: var(--gray); margin-bottom: 1rem; }
.result-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: .75rem; }
.result-item { background: var(--white); border-radius: var(--radius); padding: .75rem; text-align: center; }
.result-item .ri-val { font-size: 1.15rem; font-weight: 700; color: var(--dark); }
.result-item .ri-lbl { font-size: .72rem; color: var(--gray); margin-top: .15rem; }
.result-badge {
  display: inline-block;
  padding: .35rem 1rem;
  border-radius: 20px;
  font-weight: 700;
  font-size: .9rem;
  margin-top: .5rem;
}
.badge-green  { background: #d1fae5; color: #065f46; }
.badge-yellow { background: #fef3c7; color: #92400e; }
.badge-red    { background: #fee2e2; color: #991b1b; }
.badge-blue   { background: #dbeafe; color: #1e40af; }

/* ── Tool Article ── */
.tool-article { line-height: 1.8; }
.tool-article h2 { font-size: 1.3rem; font-weight: 700; margin: 2rem 0 .75rem; color: var(--dark); border-left: 3px solid var(--primary); padding-left: .75rem; }
.tool-article p { color: #374151; margin-bottom: 1rem; }
.tool-article ol, .tool-article ul { padding-left: 1.5rem; margin-bottom: 1rem; color: #374151; }
.tool-article li { margin-bottom: .4rem; }
.tool-article strong { color: var(--dark); }

/* Formula box */
.formula-box {
  background: #0f172a;
  color: #e2e8f0;
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  font-family: 'Courier New', monospace;
  font-size: .9rem;
  margin: 1rem 0 1.5rem;
  overflow-x: auto;
  line-height: 1.7;
}

/* Reference table */
.ref-table { width: 100%; border-collapse: collapse; margin: 1rem 0 1.5rem; font-size: .875rem; }
.ref-table th { background: var(--dark); color: var(--white); padding: .6rem 1rem; text-align: left; }
.ref-table td { padding: .55rem 1rem; border-bottom: 1px solid var(--border); }
.ref-table tbody tr:hover { background: var(--primary-lt); }

/* ── FAQ ── */
.faq-section { margin-top: 2.5rem; }
.faq-section h2 { font-size: 1.4rem; font-weight: 700; margin-bottom: 1.25rem; }
.faq-item { border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: .6rem; overflow: hidden; }
.faq-q {
  padding: 1rem 1.25rem;
  font-weight: 600;
  font-size: .9rem;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--white);
  transition: background var(--transition);
}
.faq-q:hover { background: var(--primary-lt); }
.faq-q .faq-icon { font-size: 1.2rem; color: var(--primary); transition: transform var(--transition); flex-shrink: 0; }
.faq-q.open .faq-icon { transform: rotate(45deg); }
.faq-a { display: none; padding: 0 1.25rem 1rem; color: #374151; font-size: .875rem; line-height: 1.7; border-top: 1px solid var(--border); }
.faq-a.open { display: block; }

/* ── Related Tools ── */
.related-tools { margin-top: 2.5rem; }
.related-tools h2 { font-size: 1.2rem; font-weight: 700; margin-bottom: 1rem; }
.related-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: .75rem; }
.related-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  text-align: center;
  font-size: .85rem;
  font-weight: 600;
  color: var(--primary);
  transition: all var(--transition);
  display: block;
}
.related-card:hover { background: var(--primary-lt); border-color: var(--primary); transform: translateY(-2px); text-decoration: none; }

/* ── Sidebar ── */
.tool-sidebar { display: flex; flex-direction: column; gap: 1.5rem; }
.sidebar-box { background: var(--white); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 1.25rem; }
.sidebar-box h3 { font-size: .9rem; font-weight: 700; margin-bottom: .85rem; color: var(--dark); }
.sidebar-links li { margin-bottom: .5rem; }
.sidebar-links a { font-size: .85rem; color: var(--primary); }
.ad-placeholder { background: var(--light); border: 1px dashed var(--border); border-radius: var(--radius); min-height: 250px; display: flex; align-items: center; justify-content: center; color: var(--gray); font-size: .8rem; text-align: center; }

/* ── Responsive ── */
@media (max-width: 900px) {
  .tool-layout { grid-template-columns: 1fr; }
  .tool-sidebar { order: -1; }
  .ad-placeholder { min-height: 90px; }
}
@media (max-width: 600px) {
  .input-grid { grid-template-columns: 1fr; }
  .result-grid { grid-template-columns: 1fr 1fr; }
  .result-main { font-size: 1.5rem; }
}

/* ── Content section (educational content for AdSense compliance) ── */
.content-section { margin-top: 2.5rem; padding-top: 2rem; border-top: 2px solid var(--border, #e2e8f0); }
.content-section h2 { font-size: 1.2rem; font-weight: 700; color: var(--dark, #1e293b); margin: 1.75rem 0 .6rem; padding-bottom: .3rem; border-bottom: 2px solid #eff6ff; }
.content-section h2:first-child { margin-top: 0; }
.content-section p { font-size: .97rem; line-height: 1.8; color: #374151; margin-bottom: 1.1rem; }
.content-section ul, .content-section ol { margin: 0 0 1.1rem 1.25rem; }
.content-section li { font-size: .97rem; line-height: 1.75; color: #374151; margin-bottom: .45rem; }
.content-section strong { color: #1e293b; font-weight: 600; }