/* ==========================================================================
   AAC STEAM BOILER & CAPACITY SELECTION PAGE STYLES
   Scope: .boiler-page
   ========================================================================== */

:root {
  --navy: #0b1727;
  --blue: #0c4f80;
  --deep-a: #104f7d;
  --deep-b: #09263d;
  --white: #ffffff;
  --silver: #eef2f5;
  --light: #f5f7f8;
  --text: #0b1727;
  --secondary: #5e6874;
  --muted: #84909c;
  --line: #dce2e7;
  --highlight: #8fc6ec;
  --shell: min(1400px, 88vw);
}

.boiler-page {
  color: var(--text);
  background: var(--white);
  font-family: 'Geist', 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  margin: 0;
  padding: 0;
}

.boiler-page * {
  box-sizing: border-box;
}

.boiler-page a {
  color: inherit;
  text-decoration: none;
}

.boiler-page p {
  color: var(--secondary);
  margin: 0;
  font-size: clamp(1rem, 1.15vw, 1.16rem);
  line-height: 1.72;
}

.boiler-page h1,
.boiler-page h2,
.boiler-page h3 {
  letter-spacing: -0.045em;
  margin: 0;
  line-height: 1.05;
  color: var(--navy);
}

.boiler-page h1 {
  color: var(--white);
  font-size: clamp(3rem, 5.8vw, 5.8rem);
  font-weight: 650;
  max-width: 960px;
}

.boiler-page h1 span {
  color: rgba(255, 255, 255, 0.6);
  font-weight: 480;
  display: block;
}

.boiler-page h2 {
  font-size: clamp(2.2rem, 4.4vw, 4.4rem);
  font-weight: 620;
  max-width: 900px;
}

.boiler-page h2 span {
  color: var(--muted);
  font-weight: 480;
  display: block;
}

.boiler-page h3 {
  font-size: clamp(1.2rem, 1.5vw, 1.5rem);
  line-height: 1.25;
  font-weight: 650;
}

.boiler-page .page-shell,
.boiler-page .shell {
  width: var(--shell);
  margin-inline: auto;
}

.boiler-page .section {
  padding-block: clamp(80px, 8.5vw, 140px);
}

.boiler-page .silver {
  background: var(--silver);
}

.boiler-page .dark-section,
.boiler-page .navy {
  background: var(--navy);
  color: var(--white);
}

.boiler-page .dark-section h2,
.boiler-page .navy h2,
.boiler-page .expansion h2 {
  color: var(--white);
}

.boiler-page .dark-section h2 span,
.boiler-page .navy h2 span,
.boiler-page .expansion h2 span {
  color: rgba(255, 255, 255, 0.55);
}

/* Eyebrows & Section Indices */
.boiler-page .eyebrow {
  color: var(--blue) !important;
  background: transparent !important;
  border: none !important;
  border-radius: 0 !important;
  padding: 0 !important;
  display: block !important;
  gap: 0 !important;
  letter-spacing: 0.18em !important;
  text-transform: uppercase !important;
  margin-bottom: 1.25rem !important;
  font-size: 0.78rem !important;
  font-weight: 750 !important;
  line-height: 1 !important;
  width: fit-content;
}

.boiler-page .eyebrow::before {
  content: none !important;
  display: none !important;
}

.boiler-page .eyebrow.light,
.boiler-page .dark-section .eyebrow,
.boiler-page .expansion .eyebrow,
.boiler-page .conversion .eyebrow {
  color: var(--highlight) !important;
}

.boiler-page .section-index {
  color: var(--blue);
  font-size: 0.85rem;
  font-weight: 750;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
  display: block;
}

/* Hero Section */
.boiler-page .hero {
  background: var(--navy);
  align-items: center;
  min-height: 90vh;
  padding-top: 40px;
  padding-bottom: 40px;
  display: flex;
  position: relative;
  overflow: hidden;
}

.boiler-page .hero-image {
  object-fit: cover;
  object-position: center;
  width: 100%;
  height: 100%;
  position: absolute;
  inset: 0;
  z-index: 1;
}

.boiler-page .hero-shade {
  background: linear-gradient(90deg, rgba(7, 19, 33, 0.96) 0%, rgba(7, 19, 33, 0.88) 35%, rgba(7, 19, 33, 0.55) 65%, rgba(7, 19, 33, 0.2) 100%);
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
}

.boiler-page .hero-content {
  z-index: 3;
  padding-top: 50px;
  position: relative;
}

.boiler-page .hero-content > * {
  max-width: min(760px, 56vw);
}

.boiler-page .hero-copy {
  color: #c6d0d8;
  max-width: 42rem;
  margin-top: 1.8rem;
  font-size: clamp(1.05rem, 1.25vw, 1.22rem);
  line-height: 1.65;
}

.boiler-page .hero-actions {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-top: 2.2rem;
  flex-wrap: wrap;
}

.boiler-page .hero-note {
  color: rgba(255, 255, 255, 0.45);
  margin-top: 2rem;
  font-size: 0.85rem;
  letter-spacing: 0.02em;
}

/* Buttons and Links */
.boiler-page .button {
  cursor: pointer;
  border-radius: 4px;
  padding: 1rem 1.8rem;
  font-size: 0.95rem;
  font-weight: 650;
  letter-spacing: -0.01em;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s ease, background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  border: 1px solid transparent;
}

.boiler-page .button-primary,
.boiler-page .button-light {
  background: var(--white);
  color: var(--navy);
}

.boiler-page .button-primary:hover,
.boiler-page .button-light:hover {
  background: #e2e8f0;
  transform: translateY(-2px);
}

.boiler-page .text-link {
  color: var(--white);
  font-weight: 600;
  font-size: 0.95rem;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: opacity 0.2s ease, gap 0.2s ease;
}

.boiler-page .text-link:hover {
  opacity: 0.85;
  gap: 10px;
}

/* 01. Understand Section */
.boiler-page .intro {
  border-bottom: 1px solid var(--line);
}

.boiler-page .editorial-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: clamp(40px, 6vw, 80px);
  align-items: start;
}

.boiler-page .editorial-copy p {
  margin-bottom: 1.25rem;
}

.boiler-page .intro blockquote {
  margin: 3.5rem 0 0 0;
  padding: 2rem 2.5rem;
  background: var(--light);
  border-left: 4px solid var(--blue);
  border-radius: 0 4px 4px 0;
  font-size: clamp(1.15rem, 1.4vw, 1.45rem);
  color: var(--navy);
  font-weight: 550;
  line-height: 1.5;
  letter-spacing: -0.02em;
}

/* 02. Connected System (Flow) */
.boiler-page .system-flow {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
  margin-block: 3.5rem 2.5rem;
}

.boiler-page .flow-step {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 4px;
  padding: 24px 20px;
  position: relative;
  transition: background 0.3s ease, border-color 0.3s ease;
}

.boiler-page .flow-step:hover {
  background: rgba(255, 255, 255, 0.09);
  border-color: var(--highlight);
}

.boiler-page .flow-step span {
  display: block;
  font-size: 0.85rem;
  font-weight: 750;
  color: var(--highlight);
  letter-spacing: 0.1em;
  margin-bottom: 12px;
}

.boiler-page .flow-step strong {
  display: block;
  color: var(--white);
  font-size: 1.15rem;
  font-weight: 650;
  line-height: 1.25;
}

.boiler-page .dark-note {
  color: rgba(255, 255, 255, 0.65);
  font-size: 1.05rem;
  max-width: 900px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 1.5rem;
}

/* 03. Evaluate (7 Inputs) */
.boiler-page .section-heading-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 40px;
  margin-bottom: 3.5rem;
  flex-wrap: wrap;
}

.boiler-page .section-heading-row p {
  max-width: 480px;
}

.boiler-page .factor-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.boiler-page .factor-row {
  background: var(--light);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 30px 28px;
  position: relative;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.boiler-page .factor-row:hover {
  transform: translateY(-3px);
  border-color: var(--blue);
  box-shadow: 0 10px 24px rgba(11, 23, 39, 0.06);
}

.boiler-page .factor-number {
  font-size: 0.9rem;
  font-weight: 750;
  color: var(--blue);
  letter-spacing: 0.1em;
  display: block;
  margin-bottom: 14px;
}

.boiler-page .factor-row h3 {
  margin-bottom: 10px;
}

/* 04. Sizing Method (Calculation) */
.boiler-page .calculation {
  background: var(--silver);
}

.boiler-page .calculation-grid {
  display: grid;
  grid-template-columns: 1fr 1.35fr;
  gap: clamp(40px, 6vw, 90px);
  align-items: start;
}

.boiler-page .sticky-copy {
  position: sticky;
  top: 100px;
}

.boiler-page .sticky-copy p:last-of-type {
  margin-top: 1.5rem;
}

.boiler-page .method-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.boiler-page .method-list li {
  display: flex;
  gap: 24px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 26px 28px;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.boiler-page .method-list li:hover {
  border-color: var(--blue);
  transform: translateX(4px);
}

.boiler-page .method-list li > span {
  font-size: 1.3rem;
  font-weight: 750;
  color: var(--blue);
  line-height: 1;
  flex-shrink: 0;
}

.boiler-page .method-list li h3 {
  margin-bottom: 8px;
  font-size: 1.15rem;
}

/* 05. Trade-offs (Undersized vs Correct vs Oversized) */
.boiler-page .tradeoff .comparison {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-block: 3.5rem 2rem;
}

.boiler-page .tradeoff article {
  background: var(--light);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
}

.boiler-page .tradeoff article:nth-child(2) {
  background: #f0f7fc;
  border-color: #badcf5;
  border-top: 4px solid var(--blue);
}

.boiler-page .tradeoff article h3 {
  font-size: 1.25rem;
  margin-bottom: 14px;
}

.boiler-page .qualification {
  font-size: 0.9rem;
  color: var(--muted);
  font-style: italic;
  margin-top: 1.5rem;
}

/* 06. Recovery Clarity */
.boiler-page .recovery {
  background: var(--silver);
}

.boiler-page .recovery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-top: 3rem;
}

.boiler-page .recovery-grid article {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 28px 24px;
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.boiler-page .recovery-grid article:hover {
  transform: translateY(-3px);
  border-color: var(--blue);
}

.boiler-page .recovery-grid article span {
  font-size: 0.85rem;
  font-weight: 750;
  color: var(--blue);
  display: block;
  margin-bottom: 12px;
}

.boiler-page .recovery-grid article h3 {
  margin-bottom: 10px;
}

/* 07. Pressure Nuance (Table) */
.boiler-page .table-wrap {
  overflow-x: auto;
  margin-block: 2.5rem 1.5rem;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--white);
}

.boiler-page table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.boiler-page thead {
  background: var(--navy);
  color: var(--white);
}

.boiler-page th,
.boiler-page td {
  padding: 18px 24px;
  border-bottom: 1px solid var(--line);
  font-size: 1rem;
}

.boiler-page thead th {
  font-weight: 650;
  letter-spacing: 0.02em;
  border-bottom: none;
}

.boiler-page tbody th {
  color: var(--navy);
  font-weight: 650;
  background: #fbfcfd;
  width: 25%;
}

.boiler-page tbody td:nth-child(2) {
  width: 45%;
  color: var(--secondary);
}

.boiler-page tbody td:nth-child(3) {
  width: 30%;
  color: var(--navy);
  font-weight: 500;
}

.boiler-page tbody tr:last-child th,
.boiler-page tbody tr:last-child td {
  border-bottom: none;
}

/* 08. India Reality */
.boiler-page .india {
  background: var(--light);
}

.boiler-page .india-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: clamp(40px, 6vw, 90px);
  align-items: start;
}

.boiler-page .india-items {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.boiler-page .india-items article {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 26px 28px;
}

.boiler-page .india-items article h3 {
  margin-bottom: 8px;
  color: var(--navy);
}

/* 09. Quote Framework (10-Item Grid) */
.boiler-page .quote-check {
  border-bottom: 1px solid var(--line);
}

.boiler-page .section-lead {
  font-size: 1.25rem;
  color: var(--navy);
  margin-top: 1rem;
  margin-bottom: 2.5rem;
  font-weight: 500;
}

.boiler-page .quote-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.boiler-page .quote-grid > div {
  background: var(--light);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 20px 22px;
  font-size: 1.05rem;
  font-weight: 650;
  color: var(--navy);
  display: flex;
  align-items: center;
  gap: 14px;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.boiler-page .quote-grid > div:hover {
  transform: translateY(-2px);
  border-color: var(--blue);
}

.boiler-page .quote-grid > div span {
  font-size: 0.85rem;
  font-weight: 750;
  color: var(--blue);
  background: var(--white);
  border: 1px solid var(--line);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

/* 10. Future Capacity (Expansion - Dark) */
.boiler-page .expansion {
  background: var(--navy);
  color: var(--white);
}

.boiler-page .expansion-grid {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: clamp(40px, 6vw, 90px);
  align-items: center;
}

.boiler-page .expansion-grid p {
  color: #c6d0d8;
  margin-bottom: 1.2rem;
}

.boiler-page .expansion-grid p:last-child {
  margin-bottom: 0;
}

/* 11. Laxmi Methodology */
.boiler-page .methodology-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 3rem;
}

.boiler-page .methodology-grid article {
  background: var(--light);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 32px 28px;
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.boiler-page .methodology-grid article:hover {
  transform: translateY(-3px);
  border-color: var(--blue);
}

.boiler-page .methodology-grid article span {
  font-size: 0.9rem;
  font-weight: 750;
  color: var(--blue);
  display: block;
  margin-bottom: 14px;
}

.boiler-page .methodology-grid article h3 {
  margin-bottom: 12px;
}

/* 12. FAQ Accordion */
.boiler-page .faq {
  border-top: 1px solid var(--line);
}

.boiler-page .faq-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 3rem;
}

.boiler-page .faq-list details {
  background: var(--light);
  border: 1px solid var(--line);
  border-radius: 4px;
  overflow: hidden;
  transition: border-color 0.2s ease;
}

.boiler-page .faq-list details[open] {
  border-color: var(--blue);
  background: var(--white);
}

.boiler-page .faq-list summary {
  padding: 24px 28px;
  cursor: pointer;
  font-weight: 650;
  font-size: 1.15rem;
  color: var(--navy);
  display: flex;
  align-items: center;
  justify-content: space-between;
  list-style: none;
  user-select: none;
}

.boiler-page .faq-list summary::-webkit-details-marker {
  display: none;
}

.boiler-page .faq-list summary span {
  font-size: 0.9rem;
  font-weight: 750;
  color: var(--blue);
  margin-right: 18px;
}

.boiler-page .faq-list summary b {
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--muted);
  transition: transform 0.2s ease;
}

.boiler-page .faq-list details[open] summary b {
  transform: rotate(45deg);
  color: var(--blue);
}

.boiler-page .faq-list details > div,
.boiler-page .faq-list details > p {
  padding: 0 28px 24px 28px;
}

.boiler-page .faq-list details p {
  color: var(--secondary);
  line-height: 1.7;
}

/* 13. Conversion CTA */
.boiler-page .conversion {
  background: linear-gradient(135deg, var(--deep-a) 0%, var(--deep-b) 100%);
  color: var(--white);
  padding-block: clamp(80px, 8vw, 130px);
}

.boiler-page .conversion-grid {
  display: grid;
  grid-template-columns: 1.1fr 1.2fr;
  gap: clamp(40px, 6vw, 90px);
  align-items: center;
}

.boiler-page .conversion-copy p {
  color: #c6d0d8;
  font-size: 1.15rem;
  margin-bottom: 2rem;
}

.boiler-page .conversion-actions {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}

.boiler-page .conversion-actions a:last-child {
  color: var(--highlight);
  font-weight: 600;
  font-size: 0.95rem;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: opacity 0.2s ease, gap 0.2s ease;
}

.boiler-page .conversion-actions a:last-child:hover {
  opacity: 0.85;
  gap: 10px;
}

/* Responsive adjustments */
@media (max-width: 1024px) {
  .boiler-page .editorial-grid,
  .boiler-page .calculation-grid,
  .boiler-page .india-grid,
  .boiler-page .expansion-grid,
  .boiler-page .conversion-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .boiler-page .sticky-copy {
    position: static;
  }

  .boiler-page .system-flow {
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  }

  .boiler-page .tradeoff .comparison,
  .boiler-page .methodology-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .boiler-page .hero-content > * {
    max-width: 100%;
  }

  .boiler-page .hero-actions,
  .boiler-page .conversion-actions {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }
}