/* ===== CSS Variables ===== */
:root {
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-primary-light: #3b82f6;
  --color-text: #111827;
  --color-text-light: #4b5563;
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-border: #e2e8f0;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.07), 0 2px 4px -2px rgb(0 0 0 / 0.05);
  --shadow-lg: 0 10px 25px -5px rgb(0 0 0 / 0.08), 0 8px 10px -6px rgb(0 0 0 / 0.04);
  --shadow-xl: 0 20px 40px -10px rgb(0 0 0 / 0.1);
  --radius: 8px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --transition: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --focus-ring: 0 0 0 3px rgba(37, 99, 235, 0.3);
}

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

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

/* Focus styles for accessibility */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

/* Skip link for accessibility */
.skip-link {
  position: absolute;
  top: -100%;
  left: 50%;
  transform: translateX(-50%);
  padding: 1rem 2rem;
  background: var(--color-primary);
  color: white;
  font-weight: 600;
  border-radius: var(--radius);
  z-index: 1000;
  transition: top var(--transition);
}

.skip-link:focus {
  top: 1rem;
}

/* ===== Container ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

@media (min-width: 640px) {
  .container { padding: 0 2rem; }
}

@media (min-width: 1024px) {
  .container { padding: 0 3rem; }
}

/* ===== Navigation ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
}

.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.logo {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

.nav-links {
  display: none;
  align-items: center;
  gap: 2.5rem;
}

.nav-links a {
  font-weight: 500;
  font-size: 0.9375rem;
  color: var(--color-text-light);
  transition: color var(--transition);
  cursor: pointer;
}

.nav-links a:hover,
.nav-links a:focus {
  color: var(--color-primary);
}

.nav-links a.btn {
  color: white;
}

.nav-links a.btn:hover,
.nav-links a.btn:focus {
  color: white;
}

@media (min-width: 768px) {
  .nav-links { display: flex; }
  .mobile-menu-btn { display: none !important; }
}

/* Mobile Menu Button */
.mobile-menu-btn {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 10px;
  background: none;
  border: none;
  cursor: pointer;
  border-radius: var(--radius);
}

.mobile-menu-btn span {
  width: 22px;
  height: 2px;
  background: var(--color-text);
  transition: var(--transition);
  border-radius: 1px;
}

.mobile-menu-btn.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Menu */
.mobile-menu {
  position: fixed;
  top: 80px;
  left: 0;
  right: 0;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: 1.5rem;
  display: none;
  flex-direction: column;
  gap: 0.5rem;
  z-index: 99;
  box-shadow: var(--shadow-lg);
}

.mobile-menu.active {
  display: flex;
}

.mobile-menu a {
  padding: 1rem 1.25rem;
  font-weight: 500;
  font-size: 1rem;
  color: var(--color-text);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
}

.mobile-menu a:hover,
.mobile-menu a:focus {
  background: var(--color-bg-alt);
  color: var(--color-primary);
}

@media (min-width: 768px) {
  .mobile-menu { display: none !important; }
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  letter-spacing: -0.01em;
}

.btn-primary {
  background: var(--color-primary);
  color: white;
  box-shadow: 0 1px 2px rgba(37, 99, 235, 0.2);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: white;
  transform: translateY(-1px);
}

.btn-lg {
  padding: 1rem 2rem;
  font-size: 1rem;
}

.btn-full {
  width: 100%;
}

/* ===== Hero ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    linear-gradient(160deg, rgba(248, 250, 252, 0.92) 0%, rgba(239, 246, 255, 0.88) 50%, rgba(219, 234, 254, 0.85) 100%),
    url("https://images.unsplash.com/photo-1600585154340-be6161a56a0c?w=1920&q=80");
  background-size: cover;
  background-position: center;
  padding: 7rem 1.5rem 5rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%232563eb' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  opacity: 0.3;
}

.hero-content {
  max-width: 720px;
  position: relative;
  z-index: 1;
}

.hero h1 {
  font-size: clamp(2.75rem, 7vw, 4.5rem);
  font-weight: 800;
  line-height: 1.05;
  margin-bottom: 1.75rem;
  color: var(--color-text);
  letter-spacing: -0.03em;
}

.hero p {
  font-size: 1.25rem;
  color: var(--color-text-light);
  margin-bottom: 2.5rem;
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}

/* ===== Sections ===== */
.section {
  padding: 6rem 0;
}

@media (min-width: 768px) {
  .section { padding: 8rem 0; }
}

.section-alt {
  background: var(--color-bg-alt);
}

.section-title {
  font-size: clamp(1.875rem, 4vw, 2.5rem);
  font-weight: 700;
  text-align: center;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-light);
  text-align: center;
  margin-bottom: 4rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ===== Services Grid ===== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.service-card {
  background: var(--color-bg);
  padding: 2.5rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}

.service-card:hover {
  box-shadow: var(--shadow-xl);
  transform: translateY(-4px);
  border-color: transparent;
}

.service-icon {
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
  color: var(--color-primary);
  border-radius: var(--radius-lg);
  margin-bottom: 1.5rem;
}

.service-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  letter-spacing: -0.01em;
}

.service-card p {
  color: var(--color-text-light);
  font-size: 1rem;
  line-height: 1.7;
}

/* ===== Gallery ===== */
.gallery-filter {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 3rem;
}

.filter-btn {
  padding: 0.625rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 600;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 100px;
  cursor: pointer;
  transition: all var(--transition);
}

.filter-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.filter-btn.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: white;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

.gallery-item {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  border-radius: var(--radius-lg);
  cursor: pointer;
  box-shadow: var(--shadow-md);
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.gallery-item:hover img,
.gallery-item:focus-within img {
  transform: scale(1.08);
}

.gallery-item-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.7) 0%, rgba(0,0,0,0.1) 40%, transparent 60%);
  display: flex;
  align-items: flex-end;
  padding: 1.5rem;
  opacity: 0;
  transition: opacity var(--transition);
}

.gallery-item:hover .gallery-item-overlay,
.gallery-item:focus-within .gallery-item-overlay {
  opacity: 1;
}

.gallery-item-overlay span {
  color: white;
  font-weight: 600;
  font-size: 1rem;
}

.gallery-note {
  text-align: center;
  color: var(--color-text-light);
  font-size: 0.9375rem;
  margin-top: 2rem;
}

/* ===== About ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4rem;
  align-items: center;
}

@media (min-width: 768px) {
  .about-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.about-content h2 {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  margin-bottom: 2rem;
  letter-spacing: -0.02em;
}

.about-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.about-list li {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  padding-left: 1.75rem;
  border-left: 3px solid var(--color-primary);
}

.about-list strong {
  font-weight: 600;
  font-size: 1.0625rem;
}

.about-list span {
  color: var(--color-text-light);
  font-size: 0.9375rem;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  text-align: center;
}

.stat {
  padding: 2rem 1rem;
  background: linear-gradient(135deg, #f8fafc 0%, #eff6ff 100%);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

.stat-number {
  display: block;
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-light);
}

/* ===== Contact ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4rem;
  max-width: 900px;
  margin: 0 auto;
}

@media (min-width: 768px) {
  .contact-grid {
    grid-template-columns: 1fr 1.2fr;
  }
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.contact-item {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
}

.contact-item svg {
  flex-shrink: 0;
  color: var(--color-primary);
  margin-top: 3px;
}

.contact-item strong {
  display: block;
  font-weight: 600;
  margin-bottom: 0.375rem;
  font-size: 1rem;
}

.contact-item a,
.contact-item span {
  color: var(--color-text-light);
  font-size: 1rem;
  transition: color var(--transition);
}

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

/* Contact CTA */
.contact-cta {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  padding: 2rem 1.5rem;
  border-radius: var(--radius-lg);
  text-align: center;
  box-shadow: var(--shadow-xl);
}

@media (min-width: 768px) {
  .contact-cta {
    padding: 3rem;
    border-radius: var(--radius-xl);
  }
}

.contact-cta h3 {
  color: white;
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  letter-spacing: -0.01em;
}

@media (min-width: 768px) {
  .contact-cta h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
  }
}

.contact-cta p {
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 1.5rem;
  font-size: 1rem;
}

@media (min-width: 768px) {
  .contact-cta p {
    margin-bottom: 2rem;
    font-size: 1.0625rem;
  }
}

.contact-cta .btn {
  background: white;
  color: var(--color-primary);
  font-weight: 700;
  padding: 0.875rem 1.5rem;
  font-size: 1rem;
  width: 100%;
}

@media (min-width: 768px) {
  .contact-cta .btn {
    padding: 1rem 2.5rem;
    font-size: 1.0625rem;
    width: auto;
  }
}

.contact-cta .btn:hover {
  background: #f8fafc;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

/* ===== Footer ===== */
.footer {
  background: var(--color-text);
  color: white;
  padding: 4rem 0 2rem;
}

.footer-content {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  margin-bottom: 2.5rem;
}

@media (min-width: 768px) {
  .footer-content {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
  }
}

.footer-brand .logo {
  display: block;
  margin-bottom: 0.75rem;
  color: white;
}

.footer-brand p {
  color: rgba(255, 255, 255, 0.7);
  font-size: 1rem;
  max-width: 280px;
}

.footer-links {
  display: flex;
  gap: 2rem;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 1rem;
  transition: color var(--transition);
  cursor: pointer;
}

.footer-links a:hover,
.footer-links a:focus {
  color: white;
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
}

.footer-bottom p {
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.9375rem;
}

/* ===== Lightbox ===== */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.95);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.lightbox.active {
  opacity: 1;
  visibility: visible;
}

.lightbox-img {
  max-width: 90%;
  max-height: 85vh;
  object-fit: contain;
  border-radius: var(--radius-lg);
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5);
}

.lightbox-close,
.lightbox-prev,
.lightbox-next {
  position: absolute;
  background: rgba(255, 255, 255, 0.1);
  border: none;
  color: white;
  font-size: 1.75rem;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  cursor: pointer;
  transition: all var(--transition);
  backdrop-filter: blur(4px);
}

.lightbox-close:hover,
.lightbox-prev:hover,
.lightbox-next:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: scale(1.05);
}

.lightbox-close {
  top: 1.5rem;
  right: 1.5rem;
}

.lightbox-prev {
  left: 1.5rem;
  top: 50%;
  transform: translateY(-50%);
}

.lightbox-prev:hover {
  transform: translateY(-50%) scale(1.05);
}

.lightbox-next {
  right: 1.5rem;
  top: 50%;
  transform: translateY(-50%);
}

.lightbox-next:hover {
  transform: translateY(-50%) scale(1.05);
}

.lightbox-caption {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  color: white;
  font-size: 1rem;
  font-weight: 500;
  text-align: center;
  max-width: 80%;
  padding: 0.75rem 1.5rem;
  background: rgba(0, 0, 0, 0.5);
  border-radius: 100px;
  backdrop-filter: blur(4px);
}

/* ===== Utilities ===== */
.hidden {
  display: none !important;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ===== Animations ===== */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.gallery-item {
  animation: fadeIn 0.4s ease forwards;
}

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

  html {
    scroll-behavior: auto;
  }
}