/* ==========================================================================
   Antigravity Core Stylesheet - High Cohesion & WCAG AA Compliant
   ========================================================================== */

:root {
  --bg-primary: hsl(42, 20%, 8%);
  --bg-card: hsl(42, 16%, 14%);
  --bg-card-hover: hsl(42, 16%, 17%);
  --border-subtle: hsl(42, 15%, 22%);
  --border-highlight: hsl(42, 22%, 32%);
  --accent: hsl(42, 86%, 63%);
  --accent-hover: hsl(42, 86%, 56%);
  --accent-subtle: hsla(42, 86%, 63%, 0.16);
  --accent-glow: hsla(42, 86%, 63%, 0.38);
  --accent-text: #0A0A0A;
  --text-main: #F8F9FA;
  --text-muted: #B3B3B3;
  --text-dim: #8E8E93;
  --input-bg: hsl(42, 16%, 9%);
  --input-border: hsl(42, 18%, 23%);
  --success-bg: #064e3b;
  --success-text: #a7f3d0;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --transition: all 0.22s ease-in-out;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Accessibility: Visually Hidden for Screen Readers */
.c-sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

/* Focus States for Accessibility */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* Layout Utilities */
.c-container {
  width: 100%;
  max-width: 1180px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* Header & Navigation */
.local-zone-item {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background-color: rgba(10, 10, 15, 0.85);
  border-bottom: 1px solid var(--border-subtle);
}

.local-frame-block {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.direct-wrapper-group {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-main);
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.hub-node-deck {
  width: 32px;
  height: 32px;
  color: var(--accent);
}

.metro-sector-item {
  display: flex;
  align-items: center;
  gap: 22px;
  list-style: none;
}

.apex-module-action {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition);
}

.apex-module-action:hover {
  color: var(--text-main);
}

.site-node-group {
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  color: var(--accent-text);
  padding: 9px 20px;
  border-radius: var(--radius-full);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.site-node-group:hover {
  opacity: 0.92;
  transform: translateY(-1px);
}

/* Hero Section */
.core-wrapper-view {
  padding: 56px 0 68px;
  position: relative;
  overflow: hidden;
}

.prime-wrapper-deck {
  display: grid;
  grid-template-columns: 1.15fr 0.95fr;
  gap: 48px;
  align-items: center;
}

.metro-unit-flow {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.hub-unit-flow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  width: fit-content;
}

.site-zone-stage {
  display: inline-flex;
  align-items: center;
  margin-right: 2px;
}

.direct-card-item {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: 2px solid var(--bg-card);
  margin-left: -8px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
  object-fit: cover;
  background-color: var(--input-bg);
}

.direct-card-item:first-child {
  margin-left: 0;
}

.hub-node-action {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background-color: #10b981;
  box-shadow: 0 0 10px #10b981;
}

.apex-wrapper-stage {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

.prime-box-view {
  color: var(--text-main);
  font-weight: 700;
}

.apex-wrapper-portal {
  font-size: clamp(2.2rem, 4vw, 3.2rem);
  font-weight: 850;
  line-height: 1.15;
  letter-spacing: -0.03em;
}

.hub-card-deck {
  color: var(--accent);
  text-shadow: 0 0 32px var(--accent-glow);
}

.metro-box-base {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 540px;
  line-height: 1.65;
}

.hub-zone-action {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 10px;
}

.site-box-block {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.site-frame-block {
  color: var(--accent);
}

/* 2-Step Micro-Interactions Funnel Card */
.core-sector-stage {
  position: relative;
}

.apex-panel-block {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 30px 28px;
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.45);
  position: relative;
  overflow: hidden;
}

.hub-module-block {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-subtle);
}

.hub-box-group {
  font-size: 1.25rem;
  font-weight: 750;
  letter-spacing: -0.01em;
}

.core-wrapper-group {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent);
  background-color: var(--accent-subtle);
  padding: 4px 10px;
  border-radius: var(--radius-full);
}

.metro-module-portal {
  display: flex;
  flex-direction: column;
  gap: 20px;
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.metro-module-portal.is-hidden {
  display: none !important;
}

.hub-zone-portal {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.apex-unit-stage {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-main);
  display: block;
}

/* Pill Selectors */
.hub-sector-block {
  display: grid;
  gap: 10px;
}

.hub-sector-block.two-col {
  grid-template-columns: 1fr 1fr;
}

.hub-sector-block.three-col {
  grid-template-columns: 1fr 1fr 1fr;
}

.hub-sector-block.four-col {
  grid-template-columns: repeat(4, 1fr);
}

.metro-sector-block {
  position: relative;
  display: block;
  cursor: pointer;
}

.metro-sector-block input[type="radio"] {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.site-module-base {
  background-color: var(--input-bg);
  border: 1px solid var(--border-subtle);
  padding: 12px 14px;
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  gap: 3px;
  transition: var(--transition);
  min-height: 56px;
}

.apex-frame-flow {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-main);
}

.core-zone-action {
  font-size: 0.72rem;
  color: var(--text-dim);
}

.metro-sector-block input[type="radio"]:checked + .site-module-base {
  background-color: var(--accent-subtle);
  border-color: var(--accent);
  box-shadow: 0 0 14px var(--accent-glow);
}

.metro-sector-block input[type="radio"]:checked + .site-module-base .apex-frame-flow {
  color: var(--accent);
}

.metro-sector-block:hover .site-module-base {
  border-color: var(--border-highlight);
}

/* Custom Select & Inputs */
.urban-frame-deck {
  position: relative;
}

.quick-node-base {
  width: 100%;
  background-color: var(--input-bg);
  border: 1px solid var(--input-border);
  color: var(--text-main);
  padding: 13px 16px;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-family: inherit;
  appearance: none;
  cursor: pointer;
  transition: var(--transition);
}

.quick-node-base:focus {
  border-color: var(--accent);
}

.local-wrapper-block {
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
  color: var(--text-muted);
}

/* Funnel Action Buttons */
.site-card-block {
  display: flex;
  gap: 12px;
  margin-top: 8px;
}

.site-card-group, .apex-module-flow {
  flex: 1;
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  color: var(--accent-text);
  border: none;
  padding: 14px 20px;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.site-card-group:hover, .apex-module-flow:hover {
  opacity: 0.93;
  transform: translateY(-1px);
}

.urban-frame-action {
  background-color: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border-subtle);
  padding: 14px 16px;
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: var(--transition);
}

.urban-frame-action:hover {
  color: var(--text-main);
  border-color: var(--border-highlight);
}

/* Step 3: 1.5s Matching Calculation Buffer Overlay */
.site-panel-deck {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--bg-card);
  border-radius: var(--radius-lg);
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 36px 24px;
  text-align: center;
  z-index: 20;
}

.apex-panel-block.is-matching .site-panel-deck {
  display: flex;
}

.prime-panel-stage {
  width: 48px;
  height: 48px;
  border: 4px solid var(--border-subtle);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: c-spin 0.8s linear infinite;
  margin-bottom: 22px;
}

.local-panel-portal {
  font-size: 1.25rem;
  font-weight: 750;
  margin-bottom: 10px;
  color: var(--text-main);
}

.apex-unit-portal {
  font-size: 0.9rem;
  color: var(--text-muted);
  max-width: 320px;
  line-height: 1.55;
  margin-bottom: 24px;
}

.direct-box-item {
  width: 100%;
  max-width: 280px;
  height: 6px;
  background-color: var(--border-subtle);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.site-unit-deck {
  width: 0%;
  height: 100%;
  background-color: var(--accent);
  border-radius: var(--radius-full);
  animation: c-fill 1.5s ease-out forwards;
}

@keyframes c-spin {
  to { transform: rotate(360deg); }
}

@keyframes c-fill {
  0% { width: 0%; }
  60% { width: 75%; }
  100% { width: 100%; }
}

/* Content Sections */
.site-box-group {
  padding: 64px 0;
  border-top: 1px solid var(--border-subtle);
}

.quick-sector-block {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 48px;
}

.hub-node-base {
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
  display: block;
}

.prime-panel-flow {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}

.metro-zone-block {
  font-size: 1.05rem;
  color: var(--text-muted);
}

/* Regional Hubs Mesh Grid */
.quick-unit-block {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 22px;
}

.prime-zone-portal {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  text-decoration: none;
  color: var(--text-main);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.direct-node-flow {
  width: 100%;
  aspect-ratio: 16 / 9;
  background-color: var(--input-bg);
  overflow: hidden;
  border-bottom: 1px solid var(--border-subtle);
}

.hub-module-portal {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.35s ease;
  display: block;
}

.prime-zone-portal:hover .hub-module-portal {
  transform: scale(1.05);
}

.prime-node-view {
  padding: 20px 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
}

.prime-zone-portal:hover {
  border-color: var(--accent);
  background-color: var(--bg-card-hover);
  transform: translateY(-3px);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.35);
}

.hub-wrapper-flow {
  width: 100%;
  max-height: 280px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-subtle);
  margin-bottom: 32px;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.4);
}

.hub-unit-portal {
  width: 100%;
  height: 100%;
  max-height: 280px;
  object-fit: cover;
  display: block;
}

.metro-node-stage {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.direct-module-block {
  font-size: 1.25rem;
  font-weight: 750;
  color: var(--text-main);
}

.site-unit-view {
  font-size: 0.82rem;
  color: var(--accent);
  font-weight: 700;
}

.core-panel-portal {
  font-size: 0.85rem;
  color: var(--text-dim);
  line-height: 1.5;
}

.local-node-block {
  margin-top: auto;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* Features Grid */
.metro-zone-deck {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.hub-panel-stage {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 28px;
}

.core-wrapper-action {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background-color: var(--accent-subtle);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}

.urban-box-view {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.apex-frame-stage {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Accessible FAQ Accordion */
.prime-frame-item {
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-width: 820px;
  margin: 0 auto;
}

.urban-sector-group {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}

.urban-sector-group.active {
  border-color: var(--border-highlight);
}

.core-card-base {
  width: 100%;
  padding: 18px 24px;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 1.02rem;
  font-weight: 650;
  font-family: inherit;
  text-align: left;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  gap: 16px;
}

.direct-panel-base {
  color: var(--accent);
  transition: transform 0.25s ease;
  flex-shrink: 0;
}

.urban-sector-group.active .direct-panel-base {
  transform: rotate(180deg);
}

.urban-card-block {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  padding: 0 24px;
  color: var(--text-muted);
  font-size: 0.94rem;
  line-height: 1.65;
}

.urban-sector-group.active .urban-card-block {
  max-height: 400px;
  padding-bottom: 20px;
}

/* Editorial & Safety Shield Layout */
.hub-node-item {
  max-width: 860px;
  margin: 0 auto;
  padding: 40px 0;
}

.quick-frame-portal {
  margin-bottom: 36px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-subtle);
}

.prime-node-base {
  font-size: clamp(2rem, 3.5vw, 2.7rem);
  font-weight: 850;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.site-panel-group {
  font-size: 0.88rem;
  color: var(--text-dim);
}

.hub-frame-flow {
  color: var(--text-muted);
  font-size: 1.02rem;
  line-height: 1.8;
}

.hub-frame-flow h2 {
  color: var(--text-main);
  font-size: 1.5rem;
  font-weight: 750;
  margin: 36px 0 16px;
}

.hub-frame-flow h3 {
  color: var(--text-main);
  font-size: 1.2rem;
  font-weight: 700;
  margin: 28px 0 12px;
}

.hub-frame-flow p {
  margin-bottom: 20px;
}

.hub-frame-flow ul {
  margin: 16px 0 24px 24px;
}

.hub-frame-flow li {
  margin-bottom: 10px;
}

.metro-node-deck {
  background-color: var(--bg-card);
  border-left: 4px solid var(--accent);
  padding: 20px 24px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 32px 0;
}

.urban-node-group {
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 6px;
}

/* Contact Form */
.core-module-deck {
  max-width: 640px;
  margin: 0 auto;
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
}

.urban-zone-block {
  display: none;
  background-color: var(--success-bg);
  color: var(--success-text);
  padding: 16px 20px;
  border-radius: var(--radius-md);
  margin-bottom: 24px;
  font-size: 0.95rem;
  font-weight: 500;
}

.urban-sector-base, .quick-panel-stage {
  width: 100%;
  background-color: var(--input-bg);
  border: 1px solid var(--input-border);
  color: var(--text-main);
  padding: 13px 16px;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-family: inherit;
  transition: var(--transition);
}

.quick-panel-stage {
  min-height: 130px;
  resize: vertical;
}

.urban-sector-base:focus, .quick-panel-stage:focus {
  border-color: var(--accent);
}

/* Footer */
.local-panel-deck {
  margin-top: auto;
  background-color: var(--bg-card);
  border-top: 1px solid var(--border-subtle);
  padding: 48px 0 32px;
}

.urban-wrapper-portal {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 36px;
  margin-bottom: 40px;
}

.direct-unit-group p {
  color: var(--text-dim);
  font-size: 0.88rem;
  margin-top: 12px;
  max-width: 320px;
  line-height: 1.6;
}

.hub-card-flow h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-main);
}

.metro-sector-portal {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.metro-sector-portal a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.88rem;
  transition: var(--transition);
}

.metro-sector-portal a:hover {
  color: var(--accent);
}

.core-box-view {
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  color: var(--text-dim);
}

/* Responsive Breakpoints */
@media (max-width: 900px) {
  .prime-wrapper-deck {
    grid-template-columns: 1fr;
    gap: 36px;
  }
  .urban-wrapper-portal {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .hub-sector-block.four-col {
    grid-template-columns: 1fr 1fr;
  }
  .urban-wrapper-portal {
    grid-template-columns: 1fr;
  }
  .core-box-view {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
  .metro-sector-item {
    gap: 12px;
  }
  .apex-module-action {
    display: none;
  }
}