/* Design System Tokens */
:root {
  --color-primary: #2563EB;
  --color-primary-light: #3B82F6;
  --color-cta: #F97316;
  --color-cta-hover: #EA580C;
  --color-bg: #0A0E17;
  --color-bg-elevated: #111827;
  --color-bg-card: #1A2234;
  --color-border: rgba(255, 255, 255, 0.08);
  --color-text: #F1F5F9;
  --color-text-muted: #94A3B8;
  --color-accent-green: #10B981;
  --font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --shadow-glow: 0 0 40px rgba(37, 99, 235, 0.15);
  --transition: 200ms ease-out;
  --header-height: 72px;
  --container-max: 1200px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, select, textarea { font-family: inherit; font-size: 16px; }

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  z-index: 9999;
  padding: 12px 20px;
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-sm);
  font-weight: 600;
}
.skip-link:focus { top: 16px; }

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(10, 14, 23, 0.8);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition);
}

.header.scrolled {
  background: rgba(10, 14, 23, 0.95);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.125rem;
  cursor: pointer;
}

.logo-icon {
  color: var(--color-primary-light);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-links a {
  padding: 8px 16px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
  min-height: 44px;
  display: flex;
  align-items: center;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--color-text);
  background: rgba(255, 255, 255, 0.05);
  outline: none;
}

.nav-cta {
  background: var(--color-primary) !important;
  color: #fff !important;
  margin-left: 8px;
}

.nav-cta:hover {
  background: var(--color-primary-light) !important;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  color: var(--color-text);
  border-radius: var(--radius-sm);
}

.nav-toggle:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: transform var(--transition), background var(--transition), box-shadow var(--transition);
  min-height: 48px;
  cursor: pointer;
}

.btn:focus-visible {
  outline: 2px solid var(--color-primary-light);
  outline-offset: 2px;
}

.btn-primary {
  background: var(--color-cta);
  color: #fff;
  box-shadow: 0 4px 20px rgba(249, 115, 22, 0.3);
}

.btn-primary:hover {
  background: var(--color-cta-hover);
  transform: translateY(-1px);
  box-shadow: 0 6px 24px rgba(249, 115, 22, 0.4);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-1px);
}

.btn-block { width: 100%; }

/* Hero */
.hero {
  position: relative;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  padding: calc(var(--header-height) + 48px) 0 80px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(37, 99, 235, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(37, 99, 235, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black, transparent);
}

.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
}

.hero-glow-1 {
  width: 500px;
  height: 500px;
  background: rgba(37, 99, 235, 0.2);
  top: -100px;
  right: -100px;
}

.hero-glow-2 {
  width: 400px;
  height: 400px;
  background: rgba(249, 115, 22, 0.1);
  bottom: 0;
  left: -100px;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: 100px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-accent-green);
  margin-bottom: 24px;
}

.badge-dot {
  width: 8px;
  height: 8px;
  background: var(--color-accent-green);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}

.gradient-text {
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-cta));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: 0 0 40px rgba(37, 99, 235, 0.3);
}

.hero-desc {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  max-width: 600px;
  margin-bottom: 36px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 64px;
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
}

.stat-num {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-text);
  font-variant-numeric: tabular-nums;
}

.stat-suffix {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary-light);
}

.stat-label {
  display: block;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-top: 4px;
}

/* Sections */
.section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 64px;
}

.section-tag {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary-light);
  margin-bottom: 12px;
}

.section-header h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 16px;
}

.section-desc {
  color: var(--color-text-muted);
  font-size: 1.0625rem;
}

/* About */
.about-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.about-card {
  padding: 32px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.about-card:hover {
  transform: translateY(-4px);
  border-color: rgba(37, 99, 235, 0.3);
  box-shadow: var(--shadow-glow);
}

.about-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(37, 99, 235, 0.1);
  border-radius: var(--radius-md);
  color: var(--color-primary-light);
  margin-bottom: 20px;
}

.about-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.about-card p {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
  line-height: 1.7;
}

/* Projects */
.projects {
  background: var(--color-bg-elevated);
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-bottom: 48px;
}

.filter-btn {
  padding: 10px 20px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  border-radius: 100px;
  min-height: 44px;
  transition: all var(--transition);
}

.filter-btn:hover,
.filter-btn:focus-visible {
  color: var(--color-text);
  border-color: rgba(255, 255, 255, 0.2);
  outline: none;
}

.filter-btn.active {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.project-card {
  display: flex;
  flex-direction: column;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition), opacity var(--transition);
}

.project-card:hover {
  transform: translateY(-4px);
  border-color: rgba(37, 99, 235, 0.25);
  box-shadow: var(--shadow-glow);
}

.project-card.hidden {
  display: none;
}

.project-visual {
  height: 140px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.6);
}

.project-visual-edu { background: linear-gradient(135deg, #1e3a5f, #2563EB33); }
.project-visual-parking { background: linear-gradient(135deg, #1a3a2a, #10B98133); }
.project-visual-charge { background: linear-gradient(135deg, #3a2a1a, #F9731633); }
.project-visual-park { background: linear-gradient(135deg, #2a1a3a, #8B5CF633); }
.project-visual-farm { background: linear-gradient(135deg, #1a3a1a, #22C55E33); }
.project-visual-ems { background: linear-gradient(135deg, #1a2a3a, #06B6D433); }
.project-visual-fire { background: linear-gradient(135deg, #3a1a1a, #EF444433); }
.project-visual-robot { background: linear-gradient(135deg, #2a2a1a, #EAB30833); }

.project-body {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.project-tag {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-primary-light);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}

.project-body h3 {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.project-body > p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  flex: 1;
  margin-bottom: 16px;
}

.project-features {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.project-features li {
  font-size: 0.75rem;
  font-weight: 500;
  padding: 4px 10px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 100px;
  color: var(--color-text-muted);
}

/* Services */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 64px;
}

.service-card {
  position: relative;
  padding: 32px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: transform var(--transition), border-color var(--transition);
}

.service-card:hover {
  transform: translateY(-4px);
}

.service-card.featured {
  border-color: rgba(249, 115, 22, 0.4);
  background: linear-gradient(180deg, rgba(249, 115, 22, 0.08), var(--color-bg-card));
}

.service-badge {
  position: absolute;
  top: -12px;
  right: 24px;
  padding: 4px 12px;
  background: var(--color-cta);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 100px;
}

.service-num {
  font-size: 2.5rem;
  font-weight: 800;
  color: rgba(255, 255, 255, 0.06);
  line-height: 1;
  margin-bottom: 16px;
  display: block;
}

.service-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.service-card > p {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
  margin-bottom: 20px;
  line-height: 1.6;
}

.service-card ul li {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  padding: 6px 0;
  padding-left: 20px;
  position: relative;
}

.service-card ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 6px;
  background: var(--color-primary-light);
  border-radius: 50%;
}

.process {
  padding: 48px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
}

.process-title {
  text-align: center;
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 40px;
}

.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.process-steps li {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.step-icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: #fff;
  font-weight: 700;
  border-radius: 50%;
  font-size: 0.875rem;
}

.process-steps strong {
  display: block;
  font-size: 1rem;
  margin-bottom: 4px;
}

.process-steps span {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

/* Tech */
.tech-categories {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.tech-group h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tech-tags span {
  padding: 8px 16px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  transition: border-color var(--transition), background var(--transition);
}

.tech-tags span:hover {
  border-color: rgba(37, 99, 235, 0.4);
  background: rgba(37, 99, 235, 0.08);
}

/* Why */
.why {
  background: var(--color-bg-elevated);
}

.why-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  padding: 64px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
}

.why-list {
  margin-top: 32px;
}

.why-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 0;
  font-size: 0.9375rem;
  color: var(--color-text-muted);
}

.why-list svg {
  flex-shrink: 0;
  color: var(--color-accent-green);
  margin-top: 2px;
}

.why-cta-box {
  padding: 40px;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(249, 115, 22, 0.05));
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.why-quote {
  font-size: 1.125rem;
  font-style: italic;
  color: var(--color-text-muted);
  margin-bottom: 24px;
  line-height: 1.7;
}

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.contact-info p {
  color: var(--color-text-muted);
  margin: 16px 0 32px;
  line-height: 1.7;
}

.contact-methods {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact-method {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  transition: color var(--transition);
  min-height: 44px;
  cursor: pointer;
}

a.contact-method:hover {
  color: var(--color-primary-light);
}

.contact-method svg {
  color: var(--color-primary-light);
  flex-shrink: 0;
}

.contact-form {
  padding: 40px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.form-group label span {
  color: var(--color-cta);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  transition: border-color var(--transition), box-shadow var(--transition);
  min-height: 48px;
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

.form-group input.error,
.form-group textarea.error {
  border-color: #EF4444;
}

.form-error {
  display: none;
  font-size: 0.8125rem;
  color: #EF4444;
  margin-top: 6px;
}

.form-group.has-error .form-error {
  display: block;
}

.form-note {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  text-align: center;
  margin-top: 16px;
}

.form-success {
  text-align: center;
  padding: 48px 24px;
}

.form-success svg {
  color: var(--color-accent-green);
  margin-bottom: 16px;
}

.form-success h3 {
  font-size: 1.25rem;
  margin-bottom: 8px;
}

.form-success p {
  color: var(--color-text-muted);
}

/* Footer */
.footer {
  padding: 40px 0;
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.footer-inner p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.footer-sub {
  margin-top: 8px;
  font-size: 0.8125rem !important;
  opacity: 0.7;
}

/* Back to top */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: #fff;
  border-radius: 50%;
  box-shadow: 0 4px 20px rgba(37, 99, 235, 0.4);
  transition: transform var(--transition), opacity var(--transition);
  z-index: 90;
}

.back-to-top:hover {
  transform: translateY(-2px);
}

.back-to-top:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 2px;
}

/* Reveal animation */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive */
@media (max-width: 1024px) {
  .about-grid,
  .services-grid {
    grid-template-columns: 1fr;
  }

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

  .why-inner {
    grid-template-columns: 1fr;
    padding: 40px;
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

@media (max-width: 768px) {
  .nav-toggle { display: flex; }

  .nav-links {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(10, 14, 23, 0.98);
    padding: 16px;
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition), opacity var(--transition);
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-links a {
    width: 100%;
    justify-content: center;
    padding: 14px;
  }

  .nav-cta { margin-left: 0 !important; }

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

  .tech-categories {
    grid-template-columns: 1fr;
  }

  .process-steps {
    grid-template-columns: 1fr;
  }

  .hero-stats {
    gap: 32px;
  }

  .section {
    padding: 64px 0;
  }

  .contact-form {
    padding: 24px;
  }
}