/* PhysicsIQ Shared Stylesheet - SEO Multi-Page Architecture */

:root {
  /* Core Backgrounds */
  --bg-primary: #030712;
  --bg-secondary: #0B1120;
  --bg-card: #111827;
  --bg-card-hover: #1F2937;
  --bg-card-deep: #0B1120;
  
  /* Accents */
  --accent-blue: #3b82f6;
  --accent-blue-dark: #2563eb;
  --accent-blue-light: #60a5fa;
  --accent-gold: #f59e0b;
  --accent-yellow: #FFD700;
  --accent-yellow-dim: #D4AF37;
  --accent-yellow-glow: rgba(255, 215, 0, 0.15);
  --accent-green: #10B981;
  --accent-red: #EF4444;
  --accent-purple: #8B5CF6;
  --accent-cyan: #06b6d4;
  --accent-orange: #F97316;
  
  /* Typography Colors */
  --text-primary: #F9FAFB;
  --text-secondary: #9CA3AF;
  --text-muted: #6B7280;
  
  /* Borders */
  --border-color: #374151;
  --border-subtle: rgba(255,255,255,0.05);
  
  /* Gradients */
  --gradient-hero: linear-gradient(135deg, #030712 0%, #0B1120 50%, #111827 100%);
  --gradient-accent: linear-gradient(135deg, #3b82f6 0%, #8B5CF6 100%);
  --gradient-gold: linear-gradient(135deg, #FFD700 0%, #f59e0b 100%);
  
  /* Fonts */
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-heading: 'Outfit', 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
  
  /* Utils */
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  
  --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 24px rgba(59, 130, 246, 0.3);
  --shadow-glow-gold: 0 0 24px rgba(255, 215, 0, 0.25);
  
  --transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  --transition-smooth: all 0.3s ease;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
}

/* HEADER */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(10,15,30,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 0;
}
.header-inner {
  max-width: 1280px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  height: 68px;
}
.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.logo-icon {
  width: 38px; height: 38px; background: var(--accent-blue);
  border-radius: 9px; display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 16px; color: white; letter-spacing: -1px;
}
.logo-text { font-size: 1.2rem; font-weight: 700; color: var(--text-primary); }
.logo-text span { color: var(--accent-blue); }

.nav-menu { display: flex; align-items: center; gap: 0.2rem; list-style: none; }
.nav-item { position: relative; }
.nav-link {
  display: block; padding: 0.5rem 0.85rem;
  color: var(--text-secondary); text-decoration: none;
  font-size: 0.88rem; font-weight: 500;
  border-radius: var(--radius-sm);
  transition: color 0.2s, background 0.2s;
  white-space: nowrap;
}
.nav-link:hover { color: var(--text-primary); background: rgba(255,255,255,0.05); }
.nav-link.active { color: var(--accent-blue); }

.nav-dropdown { position: relative; }
.nav-dropdown-toggle { cursor: pointer; }
.nav-dropdown-toggle::after {
  content: '▾'; margin-left: 4px; font-size: 0.75rem;
  display: inline-block; transition: transform 0.2s;
}
.nav-dropdown:hover .nav-dropdown-toggle::after { transform: rotate(180deg); }

.dropdown-menu {
  display: none; position: absolute; top: calc(100% ); left: 50%;
  transform: translateX(-50%);
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius-md); padding: 0.5rem;
  min-width: 220px; box-shadow: var(--shadow-card);
  z-index: 100;
}
.nav-dropdown:hover .dropdown-menu { display: block; }
.dropdown-item {
  display: block; padding: 0.6rem 1rem;
  color: var(--text-secondary); text-decoration: none;
  font-size: 0.85rem; border-radius: var(--radius-sm);
  transition: color 0.2s, background 0.2s;
}
.dropdown-item:hover { color: var(--text-primary); background: rgba(59,130,246,0.1); }

.header-right { display: flex; align-items: center; gap: 0.8rem; }
.header-cta { display: flex; align-items: center; gap: 0.7rem; }
.btn-call {
  display: flex; align-items: center; gap: 6px;
  padding: 0.5rem 1rem; border: 1px solid var(--border-color);
  border-radius: var(--radius-sm); color: var(--text-secondary);
  text-decoration: none; font-size: 0.85rem; font-weight: 500;
  transition: all 0.2s;
}
.btn-call:hover { border-color: var(--accent-blue); color: var(--accent-blue); }
.btn-book {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 0.55rem 1.2rem;
  background: var(--accent-blue); color: white;
  border-radius: var(--radius-sm); text-decoration: none;
  font-size: 0.88rem; font-weight: 600;
  transition: background 0.2s, transform 0.15s;
  box-shadow: 0 2px 12px rgba(59,130,246,0.35);
}
.btn-book:hover { background: var(--accent-blue-dark); transform: translateY(-1px); }
section { padding: 24px 0; }
/* MOBILE HAMBURGER */
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 6px; }
.hamburger span { display: block; width: 24px; height: 2px; background: var(--text-secondary); border-radius: 2px; transition: 0.3s; }
.mobile-nav { display: none; position: fixed; top: 68px; left: 0; right: 0; bottom: 0; background: var(--bg-secondary); padding: 1.5rem; overflow-y: auto; z-index: 999; }
.mobile-nav.open { display: block; }
.mobile-nav-link { display: block; padding: 0.9rem 0; border-bottom: 1px solid var(--border-color); color: var(--text-secondary); text-decoration: none; font-size: 1rem; }
.mobile-nav-link:hover { color: var(--text-primary); }
.mobile-nav-section { padding: 0.5rem 0; border-bottom: 1px solid var(--border-color); }
.mobile-nav-section-title { font-size: 0.75rem; font-weight: 700; color: var(--accent-blue); text-transform: uppercase; letter-spacing: 1px; padding: 0.5rem 0; }
.mobile-nav-sub { display: block; padding: 0.7rem 0.5rem; color: var(--text-secondary); text-decoration: none; font-size: 0.9rem; }
.mobile-nav-sub:hover { color: var(--text-primary); }

/* STICKY CTA BAR (mobile) */
.sticky-cta {
  display: none; position: fixed; bottom: 0; left: 0; right: 0; z-index: 900;
  background: var(--bg-secondary); border-top: 1px solid var(--border-color);
  padding: 0.75rem 1rem; gap: 0.75rem;
  will-change: transform;
  transform: translateZ(0);
}
@media (max-width: 768px) { .sticky-cta { display: flex; } }
.sticky-cta a { flex: 1; text-align: center; padding: 0.7rem; border-radius: var(--radius-sm); text-decoration: none; font-size: 0.9rem; font-weight: 600; }
.sticky-cta .sticky-call { border: 1px solid var(--border-color); color: var(--text-secondary); }
.sticky-cta .sticky-book { background: var(--accent-blue); color: white; }

/* MAIN LAYOUT */
main { padding-top: 72px; }

.page-hero {
  padding: 1rem 1.5rem 4rem;
  background: var(--gradient-hero);
  position: relative; overflow: hidden;
}
.page-hero::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(ellipse at 20% 50%, rgba(59,130,246,0.08) 0%, transparent 70%);
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(59,130,246,0.1); border: 1px solid rgba(59,130,246,0.3);
  border-radius: 50px; padding: 0.4rem 1rem;
  font-size: 0.8rem; font-weight: 600; color: var(--accent-blue);
  margin-bottom: 1.5rem; text-transform: uppercase; letter-spacing: 0.5px;
}
.hero-badge::before { content: '⚡'; }
.page-hero h1 { font-size: clamp(2rem, 5vw, 3.2rem); font-weight: 800; line-height: 1.2; margin-bottom: 1.2rem; max-width: 800px; }
.page-hero h1 .highlight { color: var(--accent-blue); }

.hero-pills { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-bottom: 2rem; }
.hero-pill {
  background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.1);
  border-radius: 50px; padding: 0.35rem 0.9rem; font-size: 0.8rem;
  color: var(--text-secondary);
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 1rem; margin-bottom: 2.5rem; }







/* ================= HERO SYSTEM ================= */

/* glow */
.page-hero::after {
  content: "";
  position: absolute;
  right: 5%;
  top: 20%;
  width: 420px;
  height: 420px;
  background: radial-gradient(circle, rgba(59,130,246,0.18), transparent 70%);
  filter: blur(90px);
  z-index: 0;
}

/* FIX CLICK ISSUE */
.page-hero::before,
.page-hero::after {
  pointer-events: none;
}

.hero-actions {
  position: relative;
  z-index: 10;
}

.btn-primary,
.btn-secondary {
  position: relative;
  z-index: 11;
}
/* layout */
.hero-wrapper {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 3rem;
}

/* text */
.hero-content {
  flex: 1;
  max-width: 620px;
  position: relative;
  z-index: 2;
  min-height: 400px; /* Reserve space */
}


/* image container */
.hero-image {
  flex: 1;
  max-width: 520px;
  display: flex;
  justify-content: flex-end;
  align-items: center;
  position: relative;
  z-index: 1;
}

/* image */
.hero-image img {
  max-height: 540px;
  width: 100%;
  height: auto;
  aspect-ratio: 689 / 815;
  object-fit: contain;

  filter: brightness(0.92) contrast(1.08);

  mask-image: linear-gradient(to left, black 75%, transparent 100%);
  -webkit-mask-image: linear-gradient(to left, black 75%, transparent 100%);

  transition: transform 0.6s ease;
  will-change: transform;
}

/* motion */
.page-hero:hover .hero-image img {
  transform: translateY(-4px);
}

/* text readability */
.page-hero .hero-desc {
  max-width: 520px;
  line-height: 1.75;
  font-size: 1.05rem;
}

.btn-whatsapp {
  display: inline-flex;
  align-items: center;
  gap: 10px;

  height:56px;

  padding: 0.9rem 1.6rem;
  border-radius: 10px;

  background: linear-gradient(135deg, #25D366, #1ebe5d);
  color: #ffffff;

  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;

  box-shadow: 0 6px 20px rgba(37, 211, 102, 0.35);

  transition: all 0.2s ease;
}

.btn-whatsapp:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(37, 211, 102, 0.45);
}

/* ICON FIX */
.btn-whatsapp img {
  width: 18px;
  height: 18px;
}

/* TEXT STRUCTURE */
.btn-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.btn-label {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  opacity: 0.85;
}


@media (max-width: 768px) {

  .hero-actions {
    display: flex;
    flex-direction: column;
    gap: 12px;
  }

  .hero-actions a {
    width: 100%;
    justify-content: center;
  }

}

/* ================= MOBILE ================= */

@media (max-width: 768px) {

  .page-hero { padding: 0 1.2rem 1.5rem; }

  .hero-wrapper {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 2rem;
  }

  .hero-content {
    max-width: 100%;
  }

  .hero-image {
    order: -1; /* move image ABOVE text */
    justify-content: center;
    align-items: center;
  }

  .hero-image img {
    max-height: 340px;  /* increase size */
    width: auto;
    mask-image: none;
    -webkit-mask-image: none;
    margin-top: -45px;
  }

  .hero-stats {
    justify-content: center;
    gap: 1.2rem;
  }

  .page-hero::after {
    right: 50%;
    transform: translateX(50%);
  }
}

.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 0.85rem 2rem; background: var(--accent-blue);
  color: white; border-radius: var(--radius-sm); text-decoration: none;
  font-size: 1rem; font-weight: 700;
  box-shadow: 0 4px 20px rgba(59,130,246,0.4);
  transition: all 0.2s;
}
.btn-primary:hover { background: var(--accent-blue-dark); transform: translateY(-2px); box-shadow: 0 6px 28px rgba(59,130,246,0.5); }
.btn-secondary {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 0.85rem 2rem; border: 1.5px solid var(--border-color);
  color: var(--text-secondary); border-radius: var(--radius-sm); text-decoration: none;
  font-size: 1rem; font-weight: 600; transition: all 0.2s;
}
.btn-secondary:hover { border-color: var(--accent-blue); color: var(--accent-blue); }
.hero-stats { display: flex; flex-wrap: wrap; gap: 1.5rem; }
.hero-stat { text-align: left; }
.hero-stat .stat-number { font-size: 1.8rem; font-weight: 800; color: var(--text-primary); }
.hero-stat .stat-label { font-size: 0.78rem; color: var(--text-muted); margin-top: 2px; }

/* SECTION LAYOUT */
.section { padding: 4rem 0; }
.section + .section { padding-top: 1.5rem; }
.section-alt { background: var(--bg-secondary); }
.section-inner { max-width: 1200px; margin: 0 auto; }
.section-label { font-size: 0.78rem; font-weight: 700; text-transform: uppercase; letter-spacing: 1.5px; color: var(--accent-blue); margin-bottom: 0.75rem; }
.section-title { font-size: clamp(1.7rem, 4vw, 2.6rem); font-weight: 800; line-height: 1.25; margin-bottom: 1rem; }
.section-title span { color: var(--accent-blue); }
.section-desc { font-size: 1.05rem; color: var(--text-secondary); max-width: 680px; margin-bottom: 3rem; }

/* GRID */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }
@media (max-width: 960px) { .grid-3 { grid-template-columns: repeat(2, 1fr); } .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } }

/* CARD */
.card {
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius-md); padding: 1.75rem;
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
}
.card:hover { border-color: rgba(59,130,246,0.4); box-shadow: var(--shadow-glow); transform: translateY(-3px); }
.card-icon { font-size: 1.8rem; margin-bottom: 1rem; }
.card-title { font-size: 1.05rem; font-weight: 700; margin-bottom: 0.6rem; color: var(--text-primary); }
.card-desc { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.6; }

/* FEATURES LIST */
.feature-list { list-style: none; }
.feature-list li { display: flex; gap: 0.7rem; padding: 0.6rem 0; border-bottom: 1px solid rgba(255,255,255,0.05); font-size: 0.95rem; color: var(--text-secondary); }
.feature-list li::before { content: '✓'; color: var(--accent-blue); font-weight: 700; flex-shrink: 0; }
.feature-list li:last-child { border-bottom: none; }

/* TESTIMONIALS */
.testimonial-card {
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius-md); padding: 1.75rem;
}
.testimonial-stars { color: #f59e0b; font-size: 0.9rem; margin-bottom: 0.75rem; }
.testimonial-text { font-size: 0.95rem; color: var(--text-secondary); font-style: italic; line-height: 1.7; margin-bottom: 1.2rem; }
.testimonial-badge { display: inline-block; background: rgba(59,130,246,0.1); border: 1px solid rgba(59,130,246,0.3); color: var(--accent-blue); font-size: 0.78rem; font-weight: 700; padding: 0.3rem 0.8rem; border-radius: 50px; }

/* FAQ */
.faq-item { border-bottom: 1px solid var(--border-color); }
.faq-question {
  width: 100%; background: none; border: none; color: var(--text-primary);
  font-size: 1rem; font-weight: 600; text-align: left;
  padding: 1.25rem 0; cursor: pointer;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  font-family: var(--font-sans);
}
.faq-question:hover { color: var(--accent-blue); }
.faq-icon { font-size: 1.2rem; color: var(--accent-blue); flex-shrink: 0; transition: transform 0.3s; }
.faq-answer { display: none; padding-bottom: 1.25rem; font-size: 0.95rem; color: var(--text-secondary); line-height: 1.7; }
.faq-item.open .faq-answer { display: block; }
.faq-item.open .faq-icon { transform: rotate(45deg); }

/* CTA SECTION */
.cta-section {
  padding: 5rem 0;
  background: linear-gradient(135deg, rgba(59,130,246,0.1) 0%, rgba(37,99,235,0.05) 100%);
  border-top: 1px solid rgba(59,130,246,0.2);
  border-bottom: 1px solid rgba(59,130,246,0.2);
  text-align: center;
}
.cta-section h2 { font-size: clamp(1.8rem, 4vw, 2.8rem); font-weight: 800; margin-bottom: 1rem; }
.cta-section p { font-size: 1.05rem; color: var(--text-secondary); max-width: 560px; margin: 0 auto 2rem; }
.cta-features { display: flex; justify-content: center; flex-wrap: wrap; gap: 1rem; margin-bottom: 2rem; }
.cta-feature { display: flex; align-items: center; gap: 0.5rem; font-size: 0.9rem; color: var(--text-secondary); }
.cta-feature::before { content: '✓'; color: var(--accent-blue); font-weight: 700; }

/* BREADCRUMB */
.breadcrumb { max-width: 1200px; margin: 0 auto; padding: 1rem 1.5rem 0; display: flex; gap: 0.5rem; align-items: center; flex-wrap: wrap; }
.breadcrumb a { color: var(--text-muted); text-decoration: none; font-size: 0.85rem; }
.breadcrumb a:hover { color: var(--accent-blue); }
.breadcrumb span { color: var(--text-muted); font-size: 0.85rem; }
.breadcrumb .current { color: var(--text-secondary); font-size: 0.85rem; }

/* INTERNAL LINKS SECTION */
.related-pages { padding: 4rem 1.5rem; background: var(--bg-secondary); }
.related-pages-inner { max-width: 1200px; margin: 0 auto; }
.related-grid { display: flex; flex-wrap: wrap; gap: 0.75rem; }
.related-link {
  display: flex; align-items: center; gap: 6px;
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: 50px; padding: 0.5rem 1.1rem;
  text-decoration: none; color: var(--text-secondary);
  font-size: 0.87rem; transition: all 0.2s;
}
.related-link:hover { border-color: var(--accent-blue); color: var(--accent-blue); background: rgba(59,130,246,0.08); }
.related-link::before { content: '→'; color: var(--accent-blue); }

/* LOCATION SECTION */
.location-card {
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius-md); padding: 1.5rem; display: flex; gap: 1rem; align-items: flex-start;
}
@media (max-width: 640px) {
  .location-card { flex-direction: column; gap: 0.75rem; padding: 1.25rem; }
}
.location-icon { font-size: 2rem; flex-shrink: 0; margin-top: 0.2rem; }
.location-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 0.5rem; }
.location-card p { font-size: 0.92rem; color: var(--text-secondary); }
.map-embed { border-radius: var(--radius-md); overflow: hidden; border: 1px solid var(--border-color); }
.map-embed iframe { display: block; width: 100%; border: none; }

/* COMPARE TABLE */
.compare-table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
.compare-table th { background: rgba(59,130,246,0.1); color: var(--text-primary); font-weight: 700; padding: 1rem 1.2rem; text-align: left; }
.compare-table td { padding: 0.9rem 1.2rem; border-bottom: 1px solid var(--border-color); color: var(--text-secondary); }
.compare-table td:first-child { font-weight: 600; color: var(--text-primary); }
.compare-table td.good { color: #4ade80; }
.compare-table td.bad { color: #f87171; }
.compare-table tr:hover td { background: rgba(255,255,255,0.02); }

/* STEP PROCESS */
.steps-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
@media (max-width: 768px) { .steps-grid { grid-template-columns: 1fr; } }
.step-card { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--radius-md); padding: 1.75rem; position: relative; }
.step-num { font-size: 3rem; font-weight: 900; color: rgba(59,130,246,0.15); position: absolute; top: 1rem; right: 1.25rem; line-height: 1; }
.step-icon { font-size: 1.75rem; margin-bottom: 0.75rem; }
.step-title { font-size: 1rem; font-weight: 700; margin-bottom: 0.5rem; }
.step-desc { font-size: 0.88rem; color: var(--text-secondary); }

/* FOOTER */
.site-footer { background: var(--bg-secondary); border-top: 1px solid var(--border-color); padding: 4rem 1.5rem 1.5rem; }
.footer-inner { max-width: 1200px; margin: 0 auto; }
.footer-grid { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 3rem; margin-bottom: 3rem; }
.footer-brand { flex: 0 0 340px; max-width: 100%; }
.footer-col { flex: 1; min-width: 150px; }
@media (max-width: 900px) { .footer-grid { justify-content: flex-start; gap: 2.5rem; } .footer-brand { flex: 0 0 100%; } .footer-col { flex: 0 0 calc(50% - 1.25rem); } }
@media (max-width: 540px) { .footer-grid { flex-direction: column; } .footer-col { flex: 0 0 100%; } }
.footer-brand .footer-desc { font-size: 0.9rem; color: var(--text-muted); margin: 1rem 0 1.5rem; max-width: 300px; line-height: 1.7; }
.footer-contact-item { display: flex; align-items: center; gap: 8px; font-size: 0.88rem; color: var(--text-secondary); margin-bottom: 0.6rem; }
.footer-contact-item a { color: var(--text-secondary); text-decoration: none; }
.footer-contact-item a:hover { color: var(--accent-blue); }
.footer-col h4 { font-size: 0.85rem; font-weight: 700; text-transform: uppercase; letter-spacing: 1px; color: var(--text-primary); margin-bottom: 1.2rem; }
.footer-link { display: block; color: var(--text-muted); text-decoration: none; font-size: 0.88rem; padding: 0.3rem 0; transition: color 0.2s; }
.footer-link:hover { color: var(--accent-blue); }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 1rem; padding-top: 1.5rem; border-top: 1px solid var(--border-color); }
.footer-bottom p { font-size: 0.82rem; color: var(--text-muted); }
.footer-bottom-links { display: flex; gap: 1.5rem; }
.footer-bottom-links a { color: var(--text-muted); text-decoration: none; font-size: 0.82rem; }
.footer-bottom-links a:hover { color: var(--accent-blue); }

/* BLOG ARTICLE */
.article-layout { display: grid; grid-template-columns: 1fr 300px; gap: 3rem; max-width: 1100px; margin: 0 auto; padding: 3rem 1.5rem; }
@media (max-width: 900px) { .article-layout { grid-template-columns: 1fr; } }
.article-body h2 { font-size: 1.6rem; font-weight: 700; margin: 2.5rem 0 1rem; color: var(--text-primary); }
.article-body h3 { font-size: 1.2rem; font-weight: 700; margin: 2rem 0 0.75rem; color: var(--text-primary); }
.article-body p { color: var(--text-secondary); margin-bottom: 1.2rem; line-height: 1.8; }
.article-body ul, .article-body ol { color: var(--text-secondary); padding-left: 1.5rem; margin-bottom: 1.2rem; }
.article-body li { padding: 0.3rem 0; line-height: 1.7; }
.article-body blockquote { border-left: 3px solid var(--accent-blue); padding: 1rem 1.5rem; background: rgba(59,130,246,0.05); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; margin: 1.5rem 0; font-style: italic; color: var(--text-secondary); }
.article-body a { color: var(--accent-blue); text-decoration: none; }
.article-body a:hover { text-decoration: underline; }
.article-sidebar { position: sticky; top: 88px; }
.sidebar-card { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--radius-md); padding: 1.5rem; margin-bottom: 1.5rem; }
.sidebar-card h4 { font-size: 0.9rem; font-weight: 700; text-transform: uppercase; letter-spacing: 1px; color: var(--accent-blue); margin-bottom: 1.2rem; }
.toc-link { display: block; color: var(--text-muted); text-decoration: none; font-size: 0.87rem; padding: 0.35rem 0; border-bottom: 1px solid rgba(255,255,255,0.04); transition: color 0.2s; }
.toc-link:hover { color: var(--accent-blue); }
.formula-box { background: rgba(59,130,246,0.07); border: 1px solid rgba(59,130,246,0.25); border-radius: var(--radius-sm); padding: 1rem 1.25rem; margin: 1.5rem 0; font-family: 'Courier New', monospace; font-size: 0.95rem; color: var(--accent-blue-light); }

/* NAP Box */
.nap-box { background: var(--bg-card); border: 1px solid rgba(59,130,246,0.3); border-radius: var(--radius-md); padding: 1.5rem 2rem; margin: 2rem 0; }
.nap-box h3 { font-size: 1rem; font-weight: 700; margin-bottom: 1rem; color: var(--text-primary); }
.nap-item { display: flex; gap: 0.75rem; margin-bottom: 0.6rem; font-size: 0.9rem; }
.nap-item span:first-child { color: var(--accent-blue); font-weight: 600; min-width: 80px; }
.nap-item a { color: var(--text-secondary); text-decoration: none; }
.nap-item a:hover { color: var(--accent-blue); }

/* HIGHLIGHT BOX */
.highlight-box { background: rgba(59,130,246,0.08); border: 1px solid rgba(59,130,246,0.2); border-radius: var(--radius-md); padding: 1.5rem 2rem; margin: 2rem 0; }
.highlight-box p { margin: 0; }

/* UTILITY */
.text-blue { color: var(--accent-blue); }
.text-gold { color: var(--accent-gold); }
.text-muted { color: var(--text-muted); }
.text-center { text-align: center; }
.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mt-3 { margin-top: 3rem; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }
.mb-3 { margin-bottom: 3rem; }

/* RESPONSIVE */
@media (max-width: 768px) {
  .site-header { padding: 0; }
  .header-inner { padding: 0 1rem; }
  .nav-menu { display: none; }
  .hamburger { display: flex; }
  .header-cta .btn-call { display: none; }
  .page-hero { padding: 0 1.2rem 2.5rem; }
  .section { padding: 2.5rem 0; }
  .cta-section { padding: 3rem 1.2rem; }
  main { padding-bottom: 70px; }

  /* Mobile Readability Improvements */
  p {
    font-size: 0.95rem !important;
    line-height: 1.6 !important;
    margin-bottom: 1rem !important;
  }
  .section-title {
    font-size: 1.75rem !important;
    margin-bottom: 1rem !important;
  }
  .section-inner {
    padding-left: 1.25rem !important;
    padding-right: 1.25rem !important;
  }
  .card {
    padding: 1.25rem !important;
  }
}

/* ================= RETRIEVAL INFRASTRUCTURE ================= */

/* Definition Block */
.retrieval-definition {
  background: rgba(59, 130, 246, 0.05);
  border-left: 4px solid var(--accent-blue);
  padding: 1.5rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 2rem 0;
}
.retrieval-definition h4 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--accent-blue);
  margin-bottom: 0.5rem;
}
.retrieval-definition p {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 0;
}

/* Intuition Block */
.retrieval-intuition {
  background: rgba(245, 158, 11, 0.05);
  border: 1px solid rgba(245, 158, 11, 0.2);
  padding: 1.5rem;
  border-radius: var(--radius-md);
  margin: 2rem 0;
  position: relative;
}
.retrieval-intuition::before {
  content: '💡';
  position: absolute;
  top: -12px;
  left: 20px;
  background: var(--bg-primary);
  padding: 0 8px;
}
.retrieval-intuition h4 {
  color: var(--accent-gold);
  margin-bottom: 0.75rem;
  font-size: 1rem;
}

/* Relevance Grid */
.relevance-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin: 2rem 0;
}
@media (max-width: 768px) {
  .relevance-grid { grid-template-columns: 1fr; }
}
.relevance-card {
  padding: 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
}
.relevance-card.jee { border-top: 3px solid var(--accent-blue); }
.relevance-card.neet { border-top: 3px solid var(--accent-green); }
.relevance-card.cbse { border-top: 3px solid var(--accent-gold); }
.relevance-card h5 {
  font-size: 0.75rem;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
  opacity: 0.8;
}

/* Quick Revision Box */
.revision-summary {
  background: var(--bg-card-deep);
  border: 1px dashed var(--accent-blue);
  padding: 1.5rem;
  border-radius: var(--radius-md);
  margin: 2.5rem 0;
}
.revision-summary h4 {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 1rem;
  color: var(--accent-blue-light);
}

/* Formula Highlight */
.formula-highlight {
  font-family: var(--font-mono);
  background: rgba(59, 130, 246, 0.1);
  color: var(--accent-blue-light);
  padding: 1rem;
  border-radius: var(--radius-sm);
  text-align: center;
  font-size: 1.2rem;
  margin: 1.5rem 0;
  border: 1px solid rgba(59, 130, 246, 0.2);
}

/* Cross-chapter reference links */
.cross-chapter-link {
    color: var(--accent, #FFC62A);
    font-weight: 600;
    text-decoration: underline;
    text-decoration-style: dotted;
    text-underline-offset: 3px;
    transition: color 0.2s;
}
.cross-chapter-link:hover {
    color: var(--primary-light, #93C5FD);
    text-decoration-style: solid;
}