/* ==========================================================================
   One ark — Design System & Global Stylesheet
   Architecture: Pure Modern CSS3 (Variables, Grid, Flexbox, Transitions)
   ========================================================================== */

:root {
  /* Brand Gradients (Extracted from Asset 19osiris.svg) */
  --color-solar-start: #ed932b;
  --color-solar-end: #e33a34;
  --color-solar-accent: #f6b034;
  --gradient-solar: linear-gradient(135deg, var(--color-solar-start), var(--color-solar-end));
  /* Deeper solar stops for surfaces carrying white text (both stops >= 4.5:1 against #fff) */
  --gradient-solar-cta: linear-gradient(135deg, #c24e19, #d3302a);
  
  --color-eco-start: #318440;
  --color-eco-end: #a9c13f;
  --color-eco-tint: #eef3d1;
  --gradient-eco: linear-gradient(135deg, var(--color-eco-start), var(--color-eco-end));

  /* Neutral Dark Theme Surfaces */
  --color-bg-root: #0d1117;
  --color-surface-card: #161b22;
  --color-surface-elevated: #21262d;
  --color-surface-glass: rgba(22, 27, 34, 0.85);

  /* Borders & Dividers */
  --color-border-subtle: rgba(255, 255, 255, 0.08);
  --color-border-hover: rgba(237, 147, 43, 0.35);

  /* Typography Colors */
  --color-text-primary: #f8fafc;
  --color-text-muted: #94a3b8;
  --color-text-dim: #8493a8;

  /* Typography Metrics */
  --font-sans: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.75rem;
  --text-3xl: 2.25rem;
  --text-4xl: 3rem;
  --text-5xl: 3.75rem;

  /* Spacing Grid (8px base) */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-24: 6rem;

  /* Layout Constraints */
  --container-max: 1240px;
  --header-height: 76px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  
  --shadow-subtle: 0 4px 20px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 8px 30px rgba(237, 147, 43, 0.25);
  --transition-smooth: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

/* ==========================================================================
   CSS Reset & Base Rules
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

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

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition-smooth);
}

img, svg {
  display: block;
  max-width: 100%;
}

ul {
  list-style: none;
}

button, input, textarea, select {
  font-family: inherit;
}

/* Accessibility: High-contrast focus rings for keyboard navigation */
:focus-visible {
  outline: 2px solid var(--color-solar-start);
  outline-offset: 3px;
}

/* ==========================================================================
   Global App Header & Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
  background: var(--color-surface-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border-subtle);
  display: flex;
  align-items: center;
}

.nav-container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  transition: opacity 0.2s ease;
}

.brand-logo:hover {
  opacity: 0.9;
}

.desktop-nav .nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav-link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  position: relative;
  padding: var(--space-2) 0;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-text-primary);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--gradient-solar);
  border-radius: var(--radius-full);
}

.nav-cta {
  font-size: var(--text-sm);
  font-weight: 500;
  padding: var(--space-2) var(--space-4);
  background: var(--gradient-solar-cta);
  color: #fff !important;
  border-radius: var(--radius-full);
  box-shadow: 0 2px 10px rgba(227, 58, 52, 0.3);
}

.nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 15px rgba(227, 58, 52, 0.45);
}

/* Mobile Navigation Toggle & Drawer */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
}

.hamburger-bar {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text-primary);
  margin: 5px 0;
  transition: var(--transition-smooth);
}

.mobile-drawer {
  display: none;
  position: absolute;
  top: var(--header-height);
  left: 0;
  width: 100%;
  background: var(--color-surface-card);
  border-bottom: 1px solid var(--color-border-subtle);
  padding: var(--space-6);
  box-shadow: var(--shadow-subtle);
}

.mobile-drawer.open {
  display: block;
}

.mobile-nav-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.mobile-nav-link {
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--color-text-muted);
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
  color: var(--color-text-primary);
}

.mobile-nav-link.cta {
  display: inline-block;
  margin-top: var(--space-2);
  text-align: center;
  padding: var(--space-3) var(--space-6);
  background: var(--gradient-solar-cta);
  color: #fff;
  border-radius: var(--radius-full);
}

/* ==========================================================================
   Main Application Mount Container
   ========================================================================== */
#app {
  flex: 1;
  width: 100%;
}

.page-wrapper {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-12) var(--space-6);
}

/* View Transition Crossfade */
::view-transition-old(root),
::view-transition-new(root) {
  animation-duration: 0.25s;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
  position: relative;
  padding: var(--space-24) var(--space-6) var(--space-16);
  max-width: var(--container-max);
  margin: 0 auto;
  text-align: center;
}

.hero-tagline {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 6px 16px;
  background: rgba(237, 147, 43, 0.12);
  border: 1px solid rgba(237, 147, 43, 0.25);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-solar-start);
  margin-bottom: var(--space-6);
}

.hero-title {
  font-size: clamp(2.2rem, 5vw, 4rem);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-6);
}

.gradient-text-solar {
  background: var(--gradient-solar);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.gradient-text-eco {
  background: var(--gradient-eco);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-description {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--color-text-muted);
  max-width: 780px;
  margin: 0 auto var(--space-8);
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 500;
  padding: 12px 28px;
  border-radius: var(--radius-full);
  transition: var(--transition-smooth);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--gradient-solar-cta);
  color: #fff;
  box-shadow: 0 4px 16px rgba(227, 58, 52, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(227, 58, 52, 0.5);
}

.btn-secondary {
  background: var(--color-surface-card);
  border: 1px solid var(--color-border-subtle);
  color: var(--color-text-primary);
}

.btn-secondary:hover {
  border-color: var(--color-eco-end);
  background: var(--color-surface-elevated);
  transform: translateY(-2px);
}

/* ==========================================================================
   4 Core Pillars Matrix (Design, Engineering, Construction, Digital)
   ========================================================================== */
.section-header {
  text-align: center;
  margin-bottom: var(--space-12);
}

.section-label {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-eco-end);
  margin-bottom: var(--space-2);
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.01em;
}

.pillars-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-6);
  margin-bottom: var(--space-16);
}

.pillar-card {
  background: var(--color-surface-card);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  display: flex;
  flex-direction: column;
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.pillar-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--gradient-solar);
  opacity: 0;
  transition: opacity 0.25s ease;
}

.pillar-card.eco::before {
  background: var(--gradient-eco);
}

.pillar-card:hover {
  transform: translateY(-6px);
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-subtle);
}

.pillar-card:hover::before {
  opacity: 1;
}

.pillar-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(237, 147, 43, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-6);
  font-size: 24px;
}

.pillar-card.eco .pillar-icon {
  background: rgba(49, 132, 64, 0.18);
}

.pillar-card h3 {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-3);
}

.pillar-card p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: var(--space-6);
  flex: 1;
}

.pillar-link {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-solar-start);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.pillar-card.eco .pillar-link {
  color: var(--color-eco-end);
}

/* ==========================================================================
   Metrics & Stats Counter
   ========================================================================== */
.stats-strip {
  background: var(--color-surface-card);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-8);
  text-align: center;
  margin-bottom: var(--space-16);
}

.stat-item .stat-value {
  font-size: var(--text-4xl);
  font-weight: 900;
  background: var(--gradient-solar);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1;
  margin-bottom: var(--space-2);
}

.stat-item .stat-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ==========================================================================
   Projects / Portfolio Cards
   ========================================================================== */
.filter-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  flex-wrap: wrap;
  margin-bottom: var(--space-8);
}

.filter-pill {
  background: var(--color-surface-card);
  border: 1px solid var(--color-border-subtle);
  color: var(--color-text-muted);
  padding: 8px 18px;
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  cursor: pointer;
  transition: var(--transition-smooth);
}

.filter-pill.active,
.filter-pill:hover {
  background: rgba(237, 147, 43, 0.15);
  border-color: var(--color-solar-start);
  color: var(--color-text-primary);
}

.sub-filter-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  flex-wrap: wrap;
  margin-top: calc(-1 * var(--space-4));
  margin-bottom: var(--space-8);
  padding: var(--space-2) var(--space-4);
  background: rgba(255, 255, 255, 0.02);
  border: 1px dashed var(--color-border-subtle);
  border-radius: var(--radius-full);
  max-width: max-content;
  margin-left: auto;
  margin-right: auto;
}

.sub-filter-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
  margin-right: var(--space-2);
}

.sub-filter-pill {
  background: var(--color-bg-root);
  border: 1px solid var(--color-border-subtle);
  color: var(--color-text-muted);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.sub-filter-pill.active,
.sub-filter-pill:hover {
  background: rgba(237, 147, 43, 0.2);
  border-color: var(--color-solar-start);
  color: var(--color-solar-start);
}

.pm-section-divider {
  grid-column: 1 / -1;
  padding-top: var(--space-4);
  margin-bottom: var(--space-2);
}

.pm-section-divider-inner {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-border-subtle);
}

.pm-section-divider-inner h2 {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text-primary);
  margin: 0;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(320px, 100%), 1fr));
  gap: var(--space-8);
}

.project-card {
  background: var(--color-surface-card);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  transition: var(--transition-smooth);
}

.project-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-border-hover);
}

.project-badge-row {
  display: flex;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.badge {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.08);
  color: var(--color-text-muted);
}

.badge-solar {
  background: rgba(237, 147, 43, 0.15);
  color: var(--color-solar-start);
}

.badge-eco {
  background: rgba(49, 132, 64, 0.2);
  color: var(--color-eco-end);
}

.project-card h3 {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-2);
}

.project-card p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  flex: 1;
}

.project-meta {
  font-size: var(--text-xs);
  color: var(--color-text-dim);
  border-top: 1px solid var(--color-border-subtle);
  padding-top: var(--space-3);
  display: flex;
  justify-content: space-between;
}

/* ==========================================================================
   Forms & Contact View
   ========================================================================== */
.contact-container {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--space-12);
  background: var(--color-surface-card);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-12);
}

.contact-info h2 {
  font-size: var(--text-3xl);
  font-weight: 800;
  margin-bottom: var(--space-4);
}

.contact-info p {
  color: var(--color-text-muted);
  margin-bottom: var(--space-8);
}

.form-group {
  margin-bottom: var(--space-4);
}

.form-group label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 500;
  margin-bottom: var(--space-2);
  color: var(--color-text-muted);
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  background: var(--color-bg-root);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-sm);
  color: var(--color-text-primary);
  font-size: var(--text-base);
  transition: var(--transition-smooth);
}

.form-control:focus {
  outline: none;
  border-color: var(--color-solar-start);
  box-shadow: 0 0 0 3px rgba(237, 147, 43, 0.2);
}

.checkbox-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2);
  margin-top: var(--space-2);
}

.checkbox-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  cursor: pointer;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background: var(--color-surface-card);
  border-top: 1px solid var(--color-border-subtle);
  padding: var(--space-16) var(--space-6) var(--space-8);
  margin-top: auto;
}

.footer-container {
  max-width: var(--container-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: var(--space-12);
  margin-bottom: var(--space-12);
}

.footer-tagline {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-top: var(--space-4);
  max-width: 340px;
}

.footer-col h4 {
  font-size: var(--text-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-4);
  color: var(--color-text-primary);
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-col a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.footer-col a:hover {
  color: var(--color-solar-start);
}

.footer-contact-item {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}

.footer-bottom {
  max-width: var(--container-max);
  margin: 0 auto;
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border-subtle);
  text-align: center;
  font-size: var(--text-xs);
  color: var(--color-text-dim);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 1024px) {
  .contact-container {
    grid-template-columns: 1fr;
  }
  .footer-container {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
  }
}

@media (max-width: 768px) {
  .desktop-nav {
    display: none;
  }
  .menu-toggle {
    display: block;
  }
  .footer-container {
    grid-template-columns: 1fr;
  }
  .contact-container {
    padding: var(--space-6);
    gap: var(--space-8);
  }
  .checkbox-group {
    grid-template-columns: 1fr;
  }
}