/* ============================================================
   HYDROPHOBICITY & ENVIRONMENTAL STABILITY — Landing Page Styles
   Premium Deep-Tech Scientific-Industrial Design
   ============================================================ */

/* --- Custom palette extensions for hydrophobicity theme --- */
:root {
  --accent-water: #4da8da;
  --accent-water-light: #7cc4e8;
  --accent-water-glow: rgba(77, 168, 218, 0.12);
  --accent-water-subtle: rgba(77, 168, 218, 0.06);
  --accent-moisture: #3a7bd5;
  --accent-moisture-light: #5a9be6;
  --accent-stability: #2ecc71;
  --accent-stability-muted: rgba(46, 204, 113, 0.12);
}

/* ============================================================
   STICKY SECTION NAVIGATION
   ============================================================ */
.hy-nav {
  position: sticky;
  top: 72px;
  z-index: 900;
  background: rgba(10, 12, 16, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  transform: translateY(-100%);
  opacity: 0;
  transition: transform 0.4s ease, opacity 0.4s ease;
}

.hy-nav.visible {
  transform: translateY(0);
  opacity: 1;
}

.hy-nav__inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 32px;
  display: flex;
  align-items: center;
  gap: 0;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.hy-nav__inner::-webkit-scrollbar {
  display: none;
}

.hy-nav__link {
  flex-shrink: 0;
  padding: 14px 16px;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  transition: all var(--transition-fast);
  position: relative;
  white-space: nowrap;
}

.hy-nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 16px;
  right: 16px;
  height: 2px;
  background: var(--accent-water);
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.hy-nav__link:hover {
  color: var(--text-secondary);
}

.hy-nav__link.active {
  color: var(--accent-water-light);
}

.hy-nav__link.active::after {
  transform: scaleX(1);
}

.hy-nav__cta {
  flex-shrink: 0;
  margin-left: auto;
  padding-left: 16px;
}

/* ============================================================
   HERO SECTION
   ============================================================ */
.hy-hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 72px;
  overflow: hidden;
  background: var(--bg-primary);
}

.hy-hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hy-hero__bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.015) 1px, transparent 1px);
  background-size: 60px 60px;
}

/* Water droplet particle effects */
.hy-hero__particle-field {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.hy-hero__particle {
  position: absolute;
  border-radius: 50%;
  animation: hy-float 20s ease-in-out infinite;
}

.hy-hero__particle:nth-child(1) {
  width: 500px; height: 500px;
  top: 5%; right: -10%;
  background: radial-gradient(circle, rgba(77, 168, 218, 0.08) 0%, transparent 70%);
  animation-delay: 0s;
}
.hy-hero__particle:nth-child(2) {
  width: 350px; height: 350px;
  bottom: 10%; left: -5%;
  background: radial-gradient(circle, rgba(232, 81, 45, 0.06) 0%, transparent 70%);
  animation-delay: -5s;
}
.hy-hero__particle:nth-child(3) {
  width: 250px; height: 250px;
  top: 35%; right: 15%;
  background: radial-gradient(circle, rgba(201, 209, 220, 0.04) 0%, transparent 70%);
  animation-delay: -10s;
}
.hy-hero__particle:nth-child(4) {
  width: 600px; height: 600px;
  top: -15%; left: 25%;
  background: radial-gradient(circle, rgba(77, 168, 218, 0.05) 0%, transparent 70%);
  animation-delay: -3s;
}

@keyframes hy-float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  25% { transform: translate(25px, -15px) scale(1.04); }
  50% { transform: translate(-15px, 25px) scale(0.96); }
  75% { transform: translate(10px, 10px) scale(1.02); }
}

/* Animated SVG water droplets */
.hy-hero__water-scene {
  position: absolute;
  right: -60px;
  top: 50%;
  transform: translateY(-50%);
  width: 720px;
  height: 720px;
  opacity: 0.18;
  z-index: 0;
}

.hy-hero__content {
  position: relative;
  z-index: 2;
  max-width: 720px;
}

.hy-hero__category {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 16px 7px 8px;
  background: rgba(77, 168, 218, 0.06);
  border: 1px solid rgba(77, 168, 218, 0.12);
  border-radius: 100px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-water-light);
  margin-bottom: 32px;
}

.hy-hero__category-icon {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: rgba(77, 168, 218, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
}

.hy-hero__category-icon svg {
  width: 12px;
  height: 12px;
}

.hy-hero__title {
  font-size: clamp(2.75rem, 5.5vw, 4.5rem);
  font-weight: 800;
  line-height: 1.04;
  letter-spacing: -0.04em;
  color: var(--text-primary);
  margin-bottom: 24px;
}

.hy-hero__title em {
  font-style: normal;
  background: linear-gradient(135deg, var(--accent-water-light) 0%, #C9D1DC 40%, var(--accent-heat-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hy-hero__subtitle {
  font-size: 1.1875rem;
  line-height: 1.8;
  color: var(--text-secondary);
  max-width: 600px;
  margin-bottom: 32px;
}

.hy-hero__micro-summary {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 40px;
  max-width: 680px;
}

.hy-hero__micro-item {
  background: rgba(17, 19, 24, 0.9);
  padding: 16px 20px;
  text-align: center;
}

.hy-hero__micro-value {
  font-family: var(--font-mono);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--accent-water-light);
  margin-bottom: 2px;
}

.hy-hero__micro-label {
  font-size: 0.6875rem;
  color: var(--text-tertiary);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.hy-hero__actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* ============================================================
   SECTION INTRO PATTERN (reusable)
   ============================================================ */
.hy-section-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}

.hy-section-intro--reverse {
  direction: rtl;
}

.hy-section-intro--reverse > * {
  direction: ltr;
}

/* ============================================================
   WHY HYDROPHOBICITY MATTERS
   ============================================================ */
.hy-why__risks {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 48px;
}

.hy-risk-card {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.hy-risk-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-water), var(--accent-moisture));
  opacity: 0;
  transition: opacity var(--transition-base);
}

.hy-risk-card:hover {
  border-color: var(--border-medium);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}

.hy-risk-card:hover::before {
  opacity: 1;
}

.hy-risk-card__icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  margin-bottom: 16px;
  background: rgba(77, 168, 218, 0.08);
}

.hy-risk-card__title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.hy-risk-card__desc {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Moisture risk visual */
.hy-moisture-risk-visual {
  margin-top: 48px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 48px;
  position: relative;
  overflow: hidden;
}

.hy-moisture-risk-visual::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(77, 168, 218, 0.03) 0%, transparent 50%, rgba(232, 81, 45, 0.02) 100%);
}

.hy-moisture-risk-visual svg {
  width: 100%;
  height: auto;
  position: relative;
}

/* ============================================================
   SURFACE CHEMISTRY SECTION
   ============================================================ */
.hy-surface__demo {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-top: 48px;
}

.hy-contact-angle-visual {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 48px 32px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hy-contact-angle-visual::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 60%, rgba(77, 168, 218, 0.04) 0%, transparent 70%);
}

.hy-contact-angle-visual svg {
  max-width: 320px;
  margin: 0 auto 24px;
  display: block;
  position: relative;
}

.hy-contact-angle__value {
  font-family: var(--font-mono);
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--accent-water-light);
  line-height: 1;
  margin-bottom: 8px;
  position: relative;
}

.hy-contact-angle__label {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
  position: relative;
}

.hy-contact-angle__sublabel {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-heat-light);
  margin-top: 8px;
  position: relative;
}

/* Comparison panel */
.hy-surface__comparison-panel {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.hy-surface__comparison-panel-title {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 8px;
}

.hy-surface-compare-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  background: var(--bg-surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-fast);
}

.hy-surface-compare-item:hover {
  border-color: var(--border-medium);
  background: var(--bg-elevated);
}

.hy-surface-compare-item__droplet {
  width: 42px;
  height: 42px;
  flex-shrink: 0;
}

.hy-surface-compare-item__info {
  flex: 1;
}

.hy-surface-compare-item__name {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.hy-surface-compare-item__angle {
  font-size: 0.6875rem;
  color: var(--text-tertiary);
}

.hy-surface-compare-item__status {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 100px;
}

.hy-surface-compare-item__status--super {
  background: rgba(77, 168, 218, 0.1);
  color: var(--accent-water-light);
  border: 1px solid rgba(77, 168, 218, 0.2);
}

.hy-surface-compare-item__status--moderate {
  background: rgba(245, 158, 11, 0.08);
  color: #F59E0B;
  border: 1px solid rgba(245, 158, 11, 0.15);
}

.hy-surface-compare-item__status--poor {
  background: rgba(90, 98, 117, 0.1);
  color: var(--text-tertiary);
  border: 1px solid var(--border-subtle);
}

/* ============================================================
   MOISTURE & THERMAL STABILITY SECTION
   ============================================================ */
.hy-stability__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-top: 48px;
}

.hy-stability-card {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 40px 32px;
  position: relative;
  overflow: hidden;
  transition: all var(--transition-base);
}

.hy-stability-card:hover {
  border-color: var(--border-medium);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}

.hy-stability-card--wet {
  background: linear-gradient(180deg, rgba(77, 168, 218, 0.04) 0%, var(--bg-tertiary) 100%);
}

.hy-stability-card--dry {
  background: linear-gradient(180deg, rgba(232, 81, 45, 0.04) 0%, var(--bg-tertiary) 100%);
}

.hy-stability-card__header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
}

.hy-stability-card__icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.hy-stability-card--wet .hy-stability-card__icon {
  background: rgba(77, 168, 218, 0.1);
}

.hy-stability-card--dry .hy-stability-card__icon {
  background: rgba(232, 81, 45, 0.08);
}

.hy-stability-card__title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
}

.hy-stability-card__subtitle {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hy-stability-card--wet .hy-stability-card__subtitle { color: var(--accent-water-light); }
.hy-stability-card--dry .hy-stability-card__subtitle { color: var(--accent-heat-light); }

.hy-stability-card__desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
}

/* Performance bar comparison */
.hy-perf-bars {
  margin-top: 48px;
}

.hy-perf-bars__title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 24px;
}

.hy-perf-bar-group {
  margin-bottom: 24px;
}

.hy-perf-bar-group__label {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.hy-perf-bar-set {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.hy-perf-bar {
  display: flex;
  align-items: center;
  gap: 12px;
}

.hy-perf-bar__label {
  width: 70px;
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-tertiary);
  text-align: right;
}

.hy-perf-bar__track {
  flex: 1;
  height: 28px;
  background: var(--bg-surface);
  border-radius: 6px;
  position: relative;
  overflow: hidden;
}

.hy-perf-bar__fill {
  height: 100%;
  border-radius: 6px;
  display: flex;
  align-items: center;
  padding: 0 10px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  transition: width 1.5s ease-out;
}

.hy-perf-bar__fill--levron-dry {
  background: linear-gradient(90deg, rgba(77, 168, 218, 0.2), rgba(77, 168, 218, 0.08));
  color: var(--accent-water-light);
}

.hy-perf-bar__fill--levron-wet {
  background: linear-gradient(90deg, rgba(77, 168, 218, 0.18), rgba(77, 168, 218, 0.07));
  color: var(--accent-water-light);
}

.hy-perf-bar__fill--conv-dry {
  background: rgba(138, 147, 164, 0.12);
  color: var(--text-tertiary);
}

.hy-perf-bar__fill--conv-wet {
  background: rgba(138, 147, 164, 0.06);
  color: var(--text-muted);
}

/* ============================================================
   ENVIRONMENTAL STABILITY AS ADVANTAGE
   ============================================================ */
.hy-environ__matrix {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 48px;
}

.hy-environ-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.hy-environ-card:hover {
  border-color: var(--border-medium);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}

.hy-environ-card__icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.375rem;
  margin-bottom: 20px;
  background: rgba(77, 168, 218, 0.06);
}

.hy-environ-card__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.hy-environ-card__metric {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-water-light);
  margin-bottom: 12px;
}

.hy-environ-card__desc {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ============================================================
   KEY PERFORMANCE HIGHLIGHTS
   ============================================================ */
.hy-metrics__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.hy-metric-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  text-align: center;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.hy-metric-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-water), var(--accent-heat-light));
  opacity: 0;
  transition: opacity var(--transition-base);
}

.hy-metric-card:hover {
  border-color: var(--border-medium);
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
}

.hy-metric-card:hover::before {
  opacity: 1;
}

.hy-metric-card__icon {
  font-size: 1.5rem;
  margin-bottom: 12px;
}

.hy-metric-card__value {
  font-family: var(--font-mono);
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--accent-water-light);
  margin-bottom: 6px;
  line-height: 1.2;
}

.hy-metric-card__label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.hy-metric-card__sublabel {
  font-size: 0.6875rem;
  color: var(--text-tertiary);
  line-height: 1.5;
}

/* Large metric cards (span 2) */
.hy-metric-card--wide {
  grid-column: span 2;
  text-align: left;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 24px;
  align-items: center;
}

.hy-metric-card--wide .hy-metric-card__icon {
  font-size: 2rem;
  margin-bottom: 0;
}

/* ============================================================
   COMPARISON TABLE
   ============================================================ */
.hy-compare__table-wrap {
  margin-top: 48px;
  overflow-x: auto;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
}

.hy-compare-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  min-width: 700px;
}

.hy-compare-table thead {
  background: var(--bg-surface);
}

.hy-compare-table th {
  padding: 18px 24px;
  text-align: left;
  font-weight: 600;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-medium);
  font-size: 0.8125rem;
}

.hy-compare-table th:first-child {
  width: 220px;
}

.hy-compare-table th.hy-compare-table__levron {
  color: var(--accent-water-light);
  background: rgba(77, 168, 218, 0.04);
}

.hy-compare-table td {
  padding: 16px 24px;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.8125rem;
  vertical-align: top;
}

.hy-compare-table tr:last-child td {
  border-bottom: none;
}

.hy-compare-table tbody tr {
  transition: background var(--transition-fast);
}

.hy-compare-table tbody tr:hover {
  background: rgba(255, 255, 255, 0.02);
}

.hy-compare-table td:first-child {
  font-weight: 500;
  color: var(--text-primary);
}

.hy-compare-table td.hy-compare-table__levron-cell {
  color: var(--accent-water-light);
  font-weight: 500;
  background: rgba(77, 168, 218, 0.02);
}

/* Radar chart section */
.hy-radar-wrap {
  margin-top: 48px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.hy-radar-chart-container {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 32px;
  position: relative;
}

.hy-radar-chart-container svg {
  width: 100%;
  height: auto;
}

.hy-radar-legend {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.hy-radar-legend-item {
  display: flex;
  align-items: center;
  gap: 12px;
}

.hy-radar-legend-item__color {
  width: 16px;
  height: 16px;
  border-radius: 4px;
  flex-shrink: 0;
}

.hy-radar-legend-item__name {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
}

.hy-radar-legend-item__desc {
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

/* ============================================================
   FIRE, HEAT & ENVIRONMENTAL RESILIENCE
   ============================================================ */
.hy-resilience__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 48px;
}

.hy-resilience-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.hy-resilience-card:hover {
  border-color: var(--border-medium);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}

.hy-resilience-card__header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.hy-resilience-card__icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.375rem;
}

.hy-resilience-card__icon--heat { background: rgba(232, 81, 45, 0.08); }
.hy-resilience-card__icon--fire { background: rgba(245, 158, 11, 0.08); }
.hy-resilience-card__icon--water { background: rgba(77, 168, 218, 0.08); }
.hy-resilience-card__icon--struct { background: rgba(201, 209, 220, 0.08); }
.hy-resilience-card__icon--combo { background: rgba(46, 204, 113, 0.08); }
.hy-resilience-card__icon--shock { background: rgba(255, 107, 61, 0.08); }

.hy-resilience-card__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.hy-resilience-card__value {
  font-family: var(--font-mono);
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--accent-heat-light);
  margin-bottom: 12px;
}

.hy-resilience-card__desc {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Combined resilience matrix */
.hy-resilience-matrix {
  margin-top: 48px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 40px 32px;
  overflow: hidden;
}

.hy-resilience-matrix__title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 24px;
}

.hy-resilience-matrix__items {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.hy-resilience-matrix__item {
  padding: 20px 16px;
  background: var(--bg-surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  text-align: center;
  transition: all var(--transition-fast);
}

.hy-resilience-matrix__item:hover {
  border-color: var(--border-medium);
  background: var(--bg-elevated);
}

.hy-resilience-matrix__item-icon {
  font-size: 1.5rem;
  margin-bottom: 8px;
}

.hy-resilience-matrix__item-label {
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}

.hy-resilience-matrix__item-value {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-water-light);
}

/* ============================================================
   APPLICATION RELEVANCE
   ============================================================ */
.hy-app__map {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 48px;
}

.hy-app-tile {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.hy-app-tile::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-water), var(--accent-heat-light));
  opacity: 0;
  transition: opacity var(--transition-base);
}

.hy-app-tile:hover {
  border-color: var(--border-medium);
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
}

.hy-app-tile:hover::before {
  opacity: 1;
}

.hy-app-tile__icon {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
  background: rgba(77, 168, 218, 0.06);
}

.hy-app-tile__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.hy-app-tile__desc {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
}

.hy-app-tile__relevance {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.hy-app-tile__tag {
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 100px;
  background: rgba(77, 168, 218, 0.06);
  color: var(--accent-water-light);
  border: 1px solid rgba(77, 168, 218, 0.12);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ============================================================
   MATERIAL SCIENCE DEEP DIVE
   ============================================================ */
.hy-deepdive-module {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color var(--transition-base);
}

.hy-deepdive-module:hover {
  border-color: var(--border-medium);
}

.hy-deepdive-module.active {
  border-color: rgba(77, 168, 218, 0.2);
}

.hy-deepdive-module__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 24px 28px;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.hy-deepdive-module__header:hover {
  background: rgba(255, 255, 255, 0.02);
}

.hy-deepdive-module__header-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.hy-deepdive-module__icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.125rem;
  background: rgba(77, 168, 218, 0.06);
  flex-shrink: 0;
}

.hy-deepdive-module__title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
}

.hy-deepdive-module__subtitle {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  margin-top: 2px;
}

.hy-deepdive-module__chevron {
  width: 20px;
  height: 20px;
  color: var(--text-tertiary);
  transition: transform var(--transition-base);
  flex-shrink: 0;
}

.hy-deepdive-module.active .hy-deepdive-module__chevron {
  transform: rotate(180deg);
  color: var(--accent-water-light);
}

.hy-deepdive-module__body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.5s ease;
}

.hy-deepdive-module.active .hy-deepdive-module__body {
  max-height: 800px;
}

.hy-deepdive-module__content {
  padding: 0 28px 28px;
  border-top: 1px solid var(--border-subtle);
  padding-top: 24px;
}

.hy-deepdive-module__content p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

.hy-deepdive-module__content p:last-child {
  margin-bottom: 0;
}

.hy-deepdive-module__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 16px;
}

.hy-deepdive-mini-card {
  padding: 16px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
}

.hy-deepdive-mini-card__title {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.hy-deepdive-mini-card__desc {
  font-size: 0.6875rem;
  color: var(--text-tertiary);
  line-height: 1.5;
}

/* ============================================================
   PLATFORM SECTION
   ============================================================ */
.hy-platform__ecosystem {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 48px;
}

.hy-platform-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.hy-platform-card:hover {
  border-color: var(--border-medium);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}

.hy-platform-card__icon {
  font-size: 1.5rem;
  margin-bottom: 16px;
}

.hy-platform-card__title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.hy-platform-card__desc {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  line-height: 1.5;
  flex: 1;
  margin-bottom: 16px;
}

.hy-platform-card__link {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--accent-water-light);
  letter-spacing: 0.02em;
  transition: color var(--transition-fast);
}

.hy-platform-card__link:hover {
  color: var(--accent-water);
}

/* ============================================================
   WHY LEVRON SECTION
   ============================================================ */
.hy-why__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 48px;
}

.hy-why-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  transition: all var(--transition-base);
}

.hy-why-card:hover {
  border-color: var(--border-medium);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}

.hy-why-card__value {
  font-family: var(--font-mono);
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--accent-heat-light);
  margin-bottom: 8px;
}

.hy-why-card__label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.hy-why-card__desc {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  line-height: 1.5;
}

/* ============================================================
   RESOURCES SECTION
   ============================================================ */
.hy-resources__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 48px;
}

.hy-resource-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
}

.hy-resource-card:hover {
  border-color: var(--border-medium);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}

.hy-resource-card__icon {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.125rem;
  margin-bottom: 16px;
  background: rgba(77, 168, 218, 0.06);
}

.hy-resource-card__title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.hy-resource-card__desc {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  line-height: 1.5;
  flex: 1;
  margin-bottom: 16px;
}

.hy-resource-card__action {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--accent-water-light);
  letter-spacing: 0.02em;
}

/* FAQ Section */
.hy-faq-list {
  margin-top: 48px;
}

.hy-faq-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  margin-bottom: 8px;
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.hy-faq-item:hover {
  border-color: var(--border-medium);
}

.hy-faq-item.active {
  border-color: rgba(77, 168, 218, 0.15);
}

.hy-faq-item__question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  transition: background var(--transition-fast);
}

.hy-faq-item__question:hover {
  background: rgba(255, 255, 255, 0.02);
}

.hy-faq-item__chevron {
  width: 18px;
  height: 18px;
  color: var(--text-tertiary);
  transition: transform var(--transition-base);
  flex-shrink: 0;
}

.hy-faq-item.active .hy-faq-item__chevron {
  transform: rotate(180deg);
  color: var(--accent-water-light);
}

.hy-faq-item__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}

.hy-faq-item.active .hy-faq-item__answer {
  max-height: 400px;
}

.hy-faq-item__answer-inner {
  padding: 0 24px 20px;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.7;
  border-top: 1px solid var(--border-subtle);
  padding-top: 16px;
}

/* ============================================================
   FINAL CTA
   ============================================================ */
.hy-final-cta__paths {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

.hy-cta-path {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  text-align: center;
  transition: all var(--transition-base);
}

.hy-cta-path:hover {
  border-color: var(--border-medium);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}

.hy-cta-path__icon {
  font-size: 1.75rem;
  margin-bottom: 16px;
}

.hy-cta-path h4 {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.hy-cta-path p {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  line-height: 1.5;
  margin-bottom: 20px;
}

/* ============================================================
   QUOTE / INSIGHT CALLOUT (local)
   ============================================================ */
.hy-insight {
  margin: 64px 0;
  padding: 48px 64px;
  background: var(--bg-tertiary);
  border-left: 3px solid var(--accent-water);
  border-radius: 0 var(--radius-xl) var(--radius-xl) 0;
  position: relative;
}

.hy-insight::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(77, 168, 218, 0.04), transparent);
  border-radius: 0 var(--radius-xl) var(--radius-xl) 0;
}

.hy-insight__text {
  position: relative;
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.7;
  font-style: italic;
}

.hy-insight__attribution {
  position: relative;
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-tertiary);
  font-style: normal;
}

/* ============================================================
   PROPERTY TABLE (local)
   ============================================================ */
.hy-property-table-wrap {
  margin-top: 48px;
  overflow-x: auto;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
}

.hy-property-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  min-width: 600px;
}

.hy-property-table thead {
  background: var(--bg-tertiary);
}

.hy-property-table th {
  padding: 16px 20px;
  text-align: left;
  font-weight: 600;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-subtle);
  font-size: 0.8125rem;
}

.hy-property-table td {
  padding: 14px 20px;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.8125rem;
}

.hy-property-table tr:last-child td {
  border-bottom: none;
}

.hy-property-table tbody tr {
  transition: background var(--transition-fast);
}

.hy-property-table tbody tr:hover {
  background: rgba(255, 255, 255, 0.02);
}

.hy-property-table td:first-child {
  font-weight: 500;
  color: var(--text-primary);
}

.hy-property-table td:last-child {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--accent-water-light);
}

/* ============================================================
   ANIMATED WATER DROPLET (CSS)
   ============================================================ */
.hy-droplet-anim {
  position: relative;
  width: 120px;
  height: 130px;
  margin: 0 auto;
}

.hy-droplet-anim__drop {
  position: absolute;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  width: 48px;
  height: 48px;
  border-radius: 50% 50% 50% 50% / 60% 60% 40% 40%;
  background: radial-gradient(ellipse at 30% 30%, rgba(77, 168, 218, 0.25), rgba(77, 168, 218, 0.08));
  border: 1.5px solid rgba(77, 168, 218, 0.35);
  animation: hy-droplet-hover 3s ease-in-out infinite;
}

.hy-droplet-anim__surface {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 10px;
  background: linear-gradient(180deg, rgba(201, 209, 220, 0.15), rgba(201, 209, 220, 0.06));
  border-radius: 2px;
}

@keyframes hy-droplet-hover {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(-6px); }
}

/* ============================================================
   GLOSSARY
   ============================================================ */
.hy-glossary {
  margin-top: 32px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.hy-glossary-item {
  padding: 16px 20px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
}

.hy-glossary-item__term {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.hy-glossary-item__def {
  font-size: 0.75rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1200px) {
  .hy-metrics__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .hy-metric-card--wide {
    grid-column: span 1;
    display: flex;
    flex-direction: column;
    text-align: center;
  }

  .hy-platform__ecosystem {
    grid-template-columns: repeat(2, 1fr);
  }

  .hy-final-cta__paths {
    grid-template-columns: repeat(3, 1fr);
  }

  .hy-resilience-matrix__items {
    grid-template-columns: repeat(2, 1fr);
  }

  .hy-why__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 1024px) {
  .hy-section-intro {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .hy-section-intro--reverse {
    direction: ltr;
  }

  .hy-why__risks {
    grid-template-columns: repeat(2, 1fr);
  }

  .hy-surface__demo {
    grid-template-columns: 1fr;
  }

  .hy-stability__grid {
    grid-template-columns: 1fr;
  }

  .hy-environ__matrix {
    grid-template-columns: repeat(2, 1fr);
  }

  .hy-resilience__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .hy-app__map {
    grid-template-columns: repeat(2, 1fr);
  }

  .hy-radar-wrap {
    grid-template-columns: 1fr;
  }

  .hy-hero__water-scene {
    display: none;
  }

  .hy-glossary {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .hy-nav__inner {
    padding: 0 16px;
  }

  .hy-nav__link {
    padding: 12px 10px;
    font-size: 0.625rem;
  }

  .hy-nav__cta {
    display: none;
  }

  .hy-hero__micro-summary {
    grid-template-columns: repeat(2, 1fr);
    max-width: 360px;
  }

  .hy-hero__actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hy-why__risks {
    grid-template-columns: 1fr;
  }

  .hy-metrics__grid {
    grid-template-columns: 1fr;
  }

  .hy-environ__matrix {
    grid-template-columns: 1fr;
  }

  .hy-resilience__grid {
    grid-template-columns: 1fr;
  }

  .hy-app__map {
    grid-template-columns: 1fr;
  }

  .hy-platform__ecosystem {
    grid-template-columns: 1fr;
  }

  .hy-why__grid {
    grid-template-columns: 1fr;
  }

  .hy-resources__grid {
    grid-template-columns: 1fr;
  }

  .hy-final-cta__paths {
    grid-template-columns: 1fr;
  }

  .hy-deepdive-module__grid {
    grid-template-columns: 1fr;
  }

  .hy-deepdive-module__subtitle {
    display: none;
  }

  .hy-glossary {
    grid-template-columns: 1fr;
  }

  .hy-insight {
    padding: 32px 24px;
  }

  .hy-resilience-matrix__items {
    grid-template-columns: 1fr;
  }
}