/**
 * Tech Sutro — Infrastructure Page (Bold Tech / Dark Glass)
 * assets/css/infrastructure.css
 * Rewritten: preserves every selector from original; self-contained; uses tokens.
 */

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

.infrastructure-hero {
  padding-top: clamp(5rem, 10vw, 9rem);
  padding-bottom: clamp(5rem, 9vw, 8rem);
}

.infrastructure-hero h1 {
  max-width: 900px;
  margin-inline: auto;
  font-size: clamp(3rem, 7vw, 6.5rem);
  line-height: 0.98;
  letter-spacing: -0.055em;
}

.infrastructure-hero-description {
  max-width: 720px;
  margin: 1.75rem auto 0;
  font-size: clamp(1rem, 1.5vw, 1.15rem);
  line-height: 1.8;
  color: var(--text-secondary);
}

.infrastructure-hero-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.7rem;
  margin-top: 2.5rem;
}

.infrastructure-hero-meta span {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 0.9rem;
  border: 1px solid color-mix(in oklab, var(--border-color), var(--glass-border) 50%);
  border-radius: var(--radius-full);
  background: var(--glass-bg-soft);
  backdrop-filter: blur(var(--glass-blur)) saturate(140%);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(140%);
  box-shadow: inset 0 1px 0 var(--glass-highlight);
  color: var(--text-secondary);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: border-color var(--transition-base), color var(--transition-base), box-shadow var(--transition-base);
}

.infrastructure-hero-meta span:hover {
  border-color: color-mix(in oklab, var(--accent-primary), var(--border-color) 45%);
  color: var(--text-primary);
  box-shadow:
    inset 0 1px 0 var(--glass-highlight),
    0 0 20px var(--accent-glow);
}

.infrastructure-hero-meta svg {
  width: 15px;
  height: 15px;
  color: var(--accent-primary);
  stroke-width: 1.7;
}


/* =========================================================
   CATEGORY SECTION
   ========================================================= */

.infrastructure-category-section {
  scroll-margin-top: 100px;
}

.infrastructure-category-section
+ .infrastructure-category-section {
  padding-top: clamp(5rem, 9vw, 8rem);
}


/* =========================================================
   SECTION HEADER
   ========================================================= */

.infrastructure-section-header {
  display: grid;
  grid-template-columns: minmax(170px, 0.35fr) minmax(0, 1fr);
  gap: clamp(2rem, 6vw, 7rem);
  align-items: start;
  margin-bottom: 3rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid color-mix(in oklab, var(--border-color), var(--glass-border) 60%);
  position: relative;
}

/* Gradient hairline under the section header. */
.infrastructure-section-header::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: min(240px, 40%);
  height: 1px;
  background: var(--accent-gradient);
  opacity: 0.85;
  pointer-events: none;
}

.infrastructure-section-index {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.infrastructure-section-index > span:first-child {
  font-size: clamp(2rem, 3vw, 3rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.05em;
  font-family: var(--font-mono);
  background: var(--accent-gradient);
  -webkit-background-clip: text;
          background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}

.infrastructure-section-index > span:last-child {
  color: var(--text-tertiary);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  font-family: var(--font-mono);
}

.infrastructure-section-heading {
  max-width: 800px;
}

.infrastructure-section-heading h2 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.6rem);
  line-height: 1.05;
  letter-spacing: -0.045em;
}

.infrastructure-section-heading p {
  max-width: 680px;
  margin: 1rem 0 0;
  font-size: 0.98rem;
  line-height: 1.7;
  color: var(--text-secondary);
}


/* =========================================================
   DETAIL GRID
   ========================================================= */

.infrastructure-detail-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4);
}

.infrastructure-detail-grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.infrastructure-detail-grid-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}


/* =========================================================
   DETAIL CARD (builds on shared .card frosted glass)
   ========================================================= */

.infrastructure-detail-card {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 365px;
  padding: clamp(1.5rem, 2.5vw, 2rem);
  border: 1px solid var(--card-border);
  border-radius: var(--card-radius);
  background: var(--card-bg);
  overflow: hidden;

  backdrop-filter: blur(var(--glass-blur)) saturate(140%);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(140%);

  transition:
    transform var(--transition-slow),
    border-color var(--transition-base),
    background var(--transition-base),
    box-shadow var(--transition-slow);
}

/* Soft accent bloom in the card corner. */
.infrastructure-detail-card::after {
  content: "";
  position: absolute;
  width: 200px;
  height: 200px;
  top: -100px;
  right: -100px;
  border-radius: 50%;
  background: var(--accent-gradient-2);
  opacity: 0;
  filter: blur(70px);
  pointer-events: none;
  transition: opacity var(--transition-base);
}

.infrastructure-detail-card:hover {
  transform: translateY(-6px);
  background: var(--card-bg-hover);
  border-color: color-mix(in oklab, var(--accent-primary), var(--card-border) 55%);
  box-shadow:
    var(--card-shadow-hover),
    0 24px 60px -24px color-mix(in oklab, var(--accent-primary), transparent 84%);
}

.infrastructure-detail-card:hover::after {
  opacity: 0.16;
}


/* =========================================================
   CARD TOP
   ========================================================= */

.infrastructure-detail-top {
  position: relative;
  z-index: 2;

  display: flex;
  align-items: flex-start;
  justify-content: space-between;

  margin-bottom: 2.5rem;
}

.infrastructure-detail-number {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  line-height: 1;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
          background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
  opacity: 0.75;
  transition: opacity var(--transition-base);
}

.infrastructure-detail-card:hover .infrastructure-detail-number {
  opacity: 1;
}


/* =========================================================
   ICON
   ========================================================= */

.infrastructure-detail-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;

  width: 56px;
  height: 56px;

  border: 1px solid color-mix(in oklab, var(--accent-primary), var(--glass-border) 55%);

  border-radius: var(--radius-lg);

  color: var(--accent-primary);

  background: var(--accent-gradient-soft);

  box-shadow: inset 0 1px 0 var(--glass-highlight);

  transition:
    transform var(--transition-slow),
    border-color var(--transition-base),
    background var(--transition-base),
    color var(--transition-base),
    box-shadow var(--transition-base);
}

.infrastructure-detail-icon svg {
  width: 24px;
  height: 24px;
  stroke-width: 1.6;
}

.infrastructure-detail-card:hover
.infrastructure-detail-icon {
  transform: translateY(-4px);
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  background: var(--accent-gradient-soft);
  box-shadow:
    inset 0 1px 0 var(--glass-highlight),
    0 0 0 5px color-mix(in oklab, var(--accent-primary), transparent 93%),
    0 0 28px var(--accent-glow);
}


/* =========================================================
   CARD CONTENT
   ========================================================= */

.infrastructure-detail-content {
  position: relative;
  z-index: 2;

  display: flex;
  flex-direction: column;
  flex: 1;
}

.infrastructure-detail-label {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  width: fit-content;
  margin-bottom: 0.75rem;
  padding: 0.32rem 0.65rem;

  border: 1px solid color-mix(in oklab, var(--border-color), var(--glass-border) 50%);
  border-radius: var(--radius-full);

  color: var(--accent-primary);

  background: var(--accent-gradient-soft);

  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.14em;
  text-transform: uppercase;

  backdrop-filter: blur(var(--glass-blur)) saturate(140%);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(140%);
  box-shadow: inset 0 1px 0 var(--glass-highlight);
}

.infrastructure-detail-card h3 {
  margin: 0;

  font-size: clamp(1.3rem, 2vw, 1.65rem);
  line-height: 1.2;
  letter-spacing: -0.025em;
}

.infrastructure-detail-card p {
  max-width: 48ch;
  margin: 0.85rem 0 0;

  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--text-secondary);
}


/* =========================================================
   FEATURE LIST
   ========================================================= */

.infrastructure-feature-list {
  display: flex;
  flex-direction: column;

  gap: 0.65rem;

  margin: auto 0 0;
  padding: 1.25rem 0 0;

  border-top: 1px solid color-mix(in oklab, var(--border-color), var(--glass-border) 60%);

  list-style: none;
}

.infrastructure-feature-list li {
  position: relative;

  padding-left: 1rem;

  color: var(--text-secondary);

  font-size: 0.78rem;
  line-height: 1.5;

  transition: color var(--transition-base);
}

.infrastructure-feature-list li::before {
  content: "";

  position: absolute;
  top: 0.52em;
  left: 0;

  width: 5px;
  height: 5px;

  border-radius: 50%;

  background: var(--accent-primary);

  box-shadow: 0 0 8px var(--accent-glow);
}

.infrastructure-detail-card:hover
.infrastructure-feature-list li {
  color: var(--text-primary);
}


/* =========================================================
   LARGE CARDS
   ========================================================= */

.infrastructure-detail-card-large {
  min-height: 390px;
}


/* =========================================================
   AMC SECTION
   ========================================================= */

.infrastructure-amc-section {
  padding-bottom: clamp(5rem, 9vw, 8rem);
}

.amc-panel {
  position: relative;

  padding: clamp(1.5rem, 4vw, 3rem);

  border: 1px solid color-mix(in oklab, var(--border-color), var(--glass-border) 50%);
  border-radius: var(--radius-2xl);

  background:
    linear-gradient(
      135deg,
      color-mix(in oklab, var(--accent-primary), transparent 95%),
      transparent 55%
    ),
    var(--glass-bg-strong);

  backdrop-filter: blur(var(--glass-blur)) saturate(140%);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(140%);

  box-shadow: var(--card-shadow);

  overflow: hidden;

  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.amc-panel:hover {
  border-color: color-mix(in oklab, var(--accent-primary), var(--border-color) 55%);
  box-shadow:
    var(--card-shadow),
    0 24px 64px -28px color-mix(in oklab, var(--accent-primary), transparent 84%);
}

.amc-panel::before {
  content: "";

  position: absolute;
  top: -120px;
  right: -100px;

  width: 300px;
  height: 300px;

  border-radius: 50%;

  background: var(--accent-gradient-2);

  opacity: 0.1;

  filter: blur(50px);

  pointer-events: none;
}

.amc-panel-intro {
  position: relative;
  z-index: 1;

  display: flex;
  align-items: flex-start;

  gap: 1.25rem;

  max-width: 700px;

  padding-bottom: 2rem;

  border-bottom: 1px solid color-mix(in oklab, var(--border-color), var(--glass-border) 60%);
}

.amc-panel-icon {
  flex: 0 0 auto;

  display: inline-flex;
  align-items: center;
  justify-content: center;

  width: 58px;
  height: 58px;

  border: 1px solid color-mix(in oklab, var(--accent-primary), var(--glass-border) 55%);

  border-radius: var(--radius-lg);

  color: var(--accent-primary);

  background: var(--accent-gradient-soft);

  box-shadow: inset 0 1px 0 var(--glass-highlight);
}

.amc-panel-icon svg {
  width: 24px;
  height: 24px;
  stroke-width: 1.6;
}

.amc-panel-intro h3 {
  margin: 0;

  font-size: clamp(1.4rem, 2.5vw, 2rem);
  line-height: 1.2;
  letter-spacing: -0.03em;
}

.amc-panel-intro p {
  max-width: 620px;
  margin: 0.6rem 0 0;

  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--text-secondary);
}


/* =========================================================
   AMC GRID
   ========================================================= */

.amc-grid {
  position: relative;
  z-index: 1;

  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));

  gap: var(--space-4);

  margin-top: var(--space-8);
}

.amc-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-4);

  padding: 1.5rem;

  border: 1px solid color-mix(in oklab, var(--border-color), var(--glass-border) 55%);
  border-radius: var(--radius-lg);

  background: var(--glass-bg-soft);

  backdrop-filter: blur(var(--glass-blur)) saturate(140%);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(140%);

  box-shadow: inset 0 1px 0 var(--glass-highlight);

  transition: border-color var(--transition-base), background var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base);
}

.amc-item:hover {
  transform: translateY(-3px);
  border-color: color-mix(in oklab, var(--accent-primary), var(--border-color) 50%);
  background: var(--glass-bg);
  box-shadow:
    inset 0 1px 0 var(--glass-highlight),
    0 16px 40px -22px color-mix(in oklab, var(--accent-primary), transparent 86%);
}

.amc-item-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;

  width: 44px;
  height: 44px;

  border: 1px solid color-mix(in oklab, var(--accent-primary), var(--glass-border) 60%);
  border-radius: var(--radius-md);

  color: var(--accent-primary);

  background: var(--accent-gradient-soft);

  box-shadow: inset 0 1px 0 var(--glass-highlight);
}

.amc-item-icon svg {
  width: 19px;
  height: 19px;
  stroke-width: 1.6;
}

.amc-item h4 {
  margin: 0;

  font-size: 1rem;
  line-height: 1.35;
}

.amc-item .infrastructure-feature-list {
  margin-top: var(--space-4);
  border-top-color: color-mix(in oklab, var(--border-color), var(--glass-border) 60%);
}


/* =========================================================
   AMC ACTION
   ========================================================= */

.amc-action {
  position: relative;
  z-index: 1;

  margin-top: var(--space-8);
}


/* =========================================================
   CTA
   ========================================================= */

.infrastructure-cta {
  padding-top: clamp(5rem, 9vw, 8rem);
}

.infrastructure-cta h2 {
  max-width: 800px;
  margin-inline: auto;

  font-size: clamp(2rem, 4.5vw, 4rem);
  line-height: 1.05;
  letter-spacing: -0.045em;
}


/* =========================================================
   RESPONSIVE — TABLET
   ========================================================= */

@media (max-width: 1000px) {

  .infrastructure-section-header {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: var(--space-8);
  }

  .infrastructure-detail-grid-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .infrastructure-detail-card {
    min-height: 340px;
  }

  .infrastructure-detail-card-large {
    min-height: 360px;
  }

}


/* =========================================================
   RESPONSIVE — SMALL TABLET
   ========================================================= */

@media (max-width: 800px) {

  .infrastructure-hero h1 {
    font-size: clamp(2.8rem, 9vw, 4.8rem);
  }

  .infrastructure-section-header {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }

  .infrastructure-section-index {
    flex-direction: row;
    align-items: baseline;
    gap: 0.8rem;
  }

  .infrastructure-section-index > span:first-child {
    font-size: 2rem;
  }

  .infrastructure-detail-grid,
  .infrastructure-detail-grid-3,
  .infrastructure-detail-grid-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .amc-grid {
    grid-template-columns: 1fr;
  }

}


/* =========================================================
   RESPONSIVE — MOBILE
   ========================================================= */

@media (max-width: 640px) {

  .infrastructure-hero {
    padding-top: 4rem;
    padding-bottom: 4.5rem;
  }

  .infrastructure-hero h1 {
    font-size: clamp(2.5rem, 13vw, 4rem);
  }

  .infrastructure-hero-description {
    margin-top: 1.25rem;
    font-size: 0.95rem;
  }

  .infrastructure-hero-meta {
    justify-content: flex-start;
    margin-top: 2rem;
  }

  .infrastructure-hero-meta span {
    font-size: 0.66rem;
  }

  .infrastructure-category-section
  + .infrastructure-category-section {
    padding-top: 4.5rem;
  }

  .infrastructure-section-header {
    margin-bottom: 2rem;
    padding-bottom: 1.25rem;
  }

  .infrastructure-section-heading h2 {
    font-size: 2rem;
  }

  .infrastructure-section-heading p {
    font-size: 0.88rem;
  }

  .infrastructure-detail-grid,
  .infrastructure-detail-grid-3,
  .infrastructure-detail-grid-2 {
    grid-template-columns: 1fr;
  }

  .infrastructure-detail-card,
  .infrastructure-detail-card-large {
    min-height: auto;
    padding: var(--space-6);
  }

  .infrastructure-detail-top {
    margin-bottom: var(--space-8);
  }

  .infrastructure-detail-icon {
    width: 50px;
    height: 50px;
  }

  .infrastructure-detail-icon svg {
    width: 22px;
    height: 22px;
  }

  .infrastructure-feature-list {
    margin-top: var(--space-6);
  }

  .amc-panel {
    padding: var(--space-5);
    border-radius: var(--radius-xl);
  }

  .amc-panel-intro {
    flex-direction: column;
    gap: var(--space-4);
  }

  .amc-item {
    grid-template-columns: 1fr;
    padding: var(--space-5);
  }

  .amc-action .btn {
    width: 100%;
    justify-content: center;
  }

  .infrastructure-cta h2 {
    font-size: 2rem;
  }

}


/* =========================================================
   REDUCED MOTION
   ========================================================= */

@media (prefers-reduced-motion: reduce) {

  .infrastructure-detail-card,
  .infrastructure-detail-icon,
  .amc-item,
  .amc-panel,
  .infrastructure-hero-meta span,
  .infrastructure-feature-list li {
    transition: none !important;
  }

  .infrastructure-detail-card:hover {
    transform: none;
  }

  .infrastructure-detail-card:hover
  .infrastructure-detail-icon {
    transform: none;
  }

  .amc-item:hover {
    transform: none;
  }

}