/* Hero Section */
.hero-section {
  position: relative;
  overflow: hidden;
  padding-top: calc(var(--nav-height) + var(--space-xl));
  color: var(--color-text-inverse);
}

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

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  background-image: url('https://images.unsplash.com/photo-1600585154340-be6161a56a0c?w=1920&q=80');
  background-size: cover;
  background-position: center;
  will-change: transform, opacity;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(17,17,17,0.95) 0%, rgba(17,17,17,0.82) 40%, rgba(17,17,17,0.55) 100%);
  z-index: 1;
}

.hero-airflow-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 3;
  overflow: hidden;
}

.hero-subtitle {
  font-size: clamp(1.35rem, 2.5vw, 1.85rem);
  font-weight: 500;
  color: #F5F5F5;
  margin-bottom: var(--space-lg);
  max-width: 820px;
  line-height: 1.45;
}

.hero-description {
  color: #E8E8E8;
  font-size: clamp(1.15rem, 1.5vw, 1.35rem);
  line-height: 1.7;
  max-width: 780px;
}

.hero-ctas {
  display: flex;
  gap: var(--space-md);
  margin-top: var(--space-xl);
  flex-wrap: wrap;
}

.hero-ctas .btn-primary {
  background-color: #FFFFFF;
  color: #111111;
  font-weight: 700;
  border: 1px solid #FFFFFF;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}
.hero-ctas .btn-primary:hover {
  background-color: #F0F0F0;
  transform: translateY(-2px);
}

.hero-ctas .btn-secondary {
  background-color: rgba(255, 255, 255, 0.12);
  color: #FFFFFF;
  border: 1px solid rgba(255, 255, 255, 0.45);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  font-weight: 600;
}
.hero-ctas .btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.22);
  border-color: #FFFFFF;
  transform: translateY(-2px);
}

.hero-sensors {
  display: flex;
  gap: var(--space-md);
  margin-top: var(--space-xl);
  flex-wrap: wrap;
}

.sensor-badge {
  background: rgba(18, 22, 28, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 8px;
  padding: var(--space-sm) var(--space-md);
}

.sensor-label {
  font-size: 0.7rem;
  color: #93C5FD;
  font-weight: 700;
  letter-spacing: 0.08em;
  display: block;
  margin-bottom: 4px;
}

.sensor-value {
  font-size: 1.05rem;
  font-weight: 600;
  color: #FFFFFF;
}

.sensor-value .text-mono {
  color: #34D399;
  font-weight: 700;
  margin-left: 4px;
}

.scroll-indicator {
  position: absolute;
  bottom: var(--space-lg);
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
}

.mouse-icon {
  display: block;
  width: 24px;
  height: 36px;
  border: 2px solid rgba(255,255,255,0.5);
  border-radius: 12px;
  position: relative;
}

.mouse-icon::after {
  content: '';
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 6px;
  background-color: white;
  border-radius: 2px;
  animation: bounce 2s infinite;
}

/* Problem Section */
.problem-cards {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

/* System Approach */
.missing-system-section {
  padding-bottom: 0;
}
.feature-success {
  color: var(--color-accent-green);
  font-weight: 600;
  font-size: 1.2rem;
}
.limitations-list {
  text-align: left;
  display: inline-block;
  margin-top: var(--space-sm);
  color: var(--color-text-secondary);
}
.limitations-list li {
  margin-bottom: 4px;
  font-size: 1rem;
  line-height: 1.8;
}

.system-nodes {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
}
.node-container {
  display: flex;
  justify-content: center;
  gap: var(--space-lg);
  flex-wrap: wrap;
}
.node {
  background: white;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: var(--space-md);
  text-align: center;
  font-weight: 600;
  font-size: 0.9rem;
  width: 120px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.05);
}
.node-result {
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 2px dashed var(--color-border);
  color: var(--color-accent-blue);
}

/* Interactive Room */
.interactive-room-container {
  position: relative;
  background: var(--color-bg-secondary);
  border-radius: 12px;
  padding: var(--space-xl);
  min-height: 500px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

#room-svg-wrapper {
  width: 100%;
  max-width: 800px;
  height: auto;
}

.info-panel {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  width: 320px;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-radius: 12px;
  padding: var(--space-lg);
  box-shadow: 0 20px 60px rgba(0,0,0,0.12), 0 2px 8px rgba(0,0,0,0.06);
  transform: translateX(110%) scale(0.95);
  opacity: 0;
  transition: transform 0.6s var(--ease-spring),
              opacity 0.4s var(--ease-out-quint);
  pointer-events: none;
  z-index: 20;
}

.info-panel.active {
  transform: translateX(0) scale(1);
  opacity: 1;
  pointer-events: all;
}

.btn-close {
  position: absolute;
  top: var(--space-sm);
  right: var(--space-sm);
  font-size: 1.5rem;
  width: 32px;
  height: 32px;
  color: var(--color-text-tertiary);
}

/* Equation */
.huge-text {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  line-height: 1;
  letter-spacing: -0.03em;
}

#engineering-principle {
  position: relative;
  overflow: hidden;
}

.equation-diagram {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}
.eq-box {
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.15);
  padding: var(--space-md) var(--space-lg);
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.9rem;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  transition: border-color 0.4s ease, box-shadow 0.4s ease;
}
.eq-box:hover {
  border-color: rgba(255,255,255,0.3);
}
.eq-box.highlighted {
  background: var(--color-accent-blue);
  border-color: var(--color-accent-blue);
  color: white;
}
.eq-operator {
  font-size: 2rem;
  color: var(--color-text-inverse-sec);
}
.eq-equals {
  font-size: 2rem;
  color: var(--color-text-inverse-sec);
}

/* Footer */
.site-footer {
  padding: var(--space-xl) 0;
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-secondary);
}
.site-footer .brand {
  font-weight: 700;
  font-size: 0.85rem;
}

/* Utilities */
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mx-auto { margin-left: auto; margin-right: auto; }
.max-w-800 { max-width: 800px; }

/* Additional Utility Classes used in HTML */
.border-bottom { border-bottom: 1px solid var(--color-border); }
.border-dark { border-color: rgba(255, 255, 255, 0.1); }
.border-top { border-top: 1px solid var(--color-border); }

.p-xs { padding: var(--space-xs); }
.p-sm { padding: var(--space-sm); }
.p-md { padding: var(--space-md); }
.p-lg { padding: var(--space-lg); }

.m-0 { margin: 0; }
.mb-xs { margin-bottom: var(--space-xs); }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

.mt-xs { margin-top: var(--space-xs); }

.pt-xl { padding-top: var(--space-xl); }
.pb-sm { padding-bottom: var(--space-sm); }
.pb-xs { padding-bottom: var(--space-xs); }

.font-600 { font-weight: 600; }

.text-muted { color: var(--color-text-tertiary); }
.dark-section .text-muted { color: rgba(255, 255, 255, 0.5); }
.dark-section p { color: #E8E8E8; }
.section.dark-section p { color: #E8E8E8; }
.dark-section .text-caption { color: #D0D0D0; }
.dark-section h3, .dark-section h4 { color: #FFFFFF; }

.flow-diagram {
  font-size: 1rem;
}

/* Table specific */
.table-container {
  background: rgba(255, 255, 255, 0.03);
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.1);
}
th { font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; font-size: 0.8rem; }

/* Dashboard Cards */
#mvp .card-dark {
  border: 1px solid #333;
}

.card-dark p {
  color: #D5D5D5;
}
.dark-section .card-dark p {
  color: #D5D5D5;
}

.text-inverse strong {
  color: #FFFFFF;
}
strong.text-inverse {
  color: #FFFFFF;
}

/* ============================================================
   Readability & High-Contrast Typography Overrides
   ============================================================ */
.dark-section h2 {
  color: #FFFFFF;
}
.dark-section .limitations-list {
  color: #E2E8F0;
}
.dark-section .limitations-list li {
  color: #E2E8F0;
  font-size: 1.05rem;
  line-height: 1.8;
}
.dark-section .border-bottom {
  border-bottom-color: rgba(255, 255, 255, 0.15);
}
.dark-section .border-dark {
  border-color: rgba(255, 255, 255, 0.15);
}
.dark-section .status-badge {
  background: rgba(59, 125, 216, 0.2);
  color: #93C5FD;
  border: 1px solid rgba(147, 197, 253, 0.35);
  font-weight: 600;
}
.dark-section .text-label {
  color: #94A3B8;
  font-weight: 700;
}
.dark-section .text-mono {
  color: #38BDF8;
  font-weight: 600;
}

/* Light Card Typography (only cards without .card-dark) */
.card:not(.card-dark) h3, .card:not(.card-dark) h4 {
  color: #0F172A;
  font-weight: 700;
}
.card:not(.card-dark) p {
  color: #334155;
  font-size: 1.05rem;
  line-height: 1.7;
}
.card:not(.card-dark) .text-caption {
  color: #475569;
  font-size: 0.95rem;
  line-height: 1.6;
}
.card:not(.card-dark) .limitations-list {
  color: #334155;
}
.card:not(.card-dark) .limitations-list li {
  color: #334155;
  font-size: 1rem;
  line-height: 1.75;
}

/* Dark Card & Dark Section Typography Overrides */
.card-dark,
.card.card-dark,
.dark-section .card {
  color: #F8FAFC;
}

.card-dark h3, .card-dark h4,
.card.card-dark h3, .card.card-dark h4,
.dark-section .card h3, .dark-section .card h4 {
  color: #FFFFFF !important;
  font-weight: 700;
}

.card-dark p,
.card.card-dark p,
.dark-section .card p {
  color: #E2E8F0 !important;
  font-size: 1.05rem;
  line-height: 1.7;
}

.card-dark .text-caption,
.card.card-dark .text-caption,
.dark-section .card .text-caption {
  color: #CBD5E1 !important;
  font-size: 0.95rem;
  line-height: 1.6;
}

.card-dark strong,
.card.card-dark strong,
.dark-section .card strong {
  color: #FFFFFF !important;
}

.card-dark ul, .card-dark ol, .card-dark li,
.card.card-dark ul, .card.card-dark ol, .card.card-dark li,
.dark-section .card ul, .dark-section .card ol, .dark-section .card li,
.card-dark .limitations-list,
.card-dark .limitations-list li,
.card.card-dark .limitations-list,
.card.card-dark .limitations-list li,
.dark-section .limitations-list,
.dark-section .limitations-list li {
  color: #F1F5F9 !important;
  font-size: 1.05rem;
  line-height: 1.8;
}

.dark-section .text-caption {
  color: #CBD5E1 !important;
}

/* Competitor Table */
.table-container th {
  color: #F8FAFC;
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  padding: 1rem;
  background: rgba(255, 255, 255, 0.05);
}
.table-container td {
  color: #E2E8F0;
  font-size: 1rem;
  padding: 1rem;
}
.table-container td.text-muted {
  color: #64748B;
}

/* Interactive Room Info Panel */
.info-panel .panel-number {
  color: #3B7DD8;
  font-weight: 700;
  font-size: 0.9rem;
}
.info-panel .panel-title {
  color: #0F172A;
  font-size: 1.35rem;
  font-weight: 700;
  margin-top: 4px;
}
.info-panel .panel-desc {
  color: #334155;
  font-size: 1.05rem;
  line-height: 1.65;
}