/* Design Tokens Implementation */
:root {
  /* Colors */
  --color-primary-50: #E6F0FF;
  --color-primary-100: #CCE0FF;
  --color-primary-500: #0066FF;
  --color-primary-600: #0052CC;
  --color-primary-900: #003D99;
  
  --color-neutral-50: #FAFAFA;
  --color-neutral-100: #F5F5F5;
  --color-neutral-200: #E5E5E5;
  --color-neutral-500: #A3A3A3;
  --color-neutral-700: #404040;
  --color-neutral-900: #171717;
  
  --color-success: #22C55E;
  --color-error: #EF4444;
  --color-warning: #F59E0B;
  --color-info: #3B82F6;
  
  --color-bg-page: #FAFAFA;
  --color-bg-surface: #FFFFFF;
  
  /* Typography */
  --font-family-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-hero: 72px;
  --font-size-title: 48px;
  --font-size-subtitle: 32px;
  --font-size-body-lg: 20px;
  --font-size-body: 16px;
  --font-size-small: 14px;
  --font-size-caption: 12px;
  
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  --line-height-tight: 1.1;
  --line-height-snug: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.6;
  
  --letter-spacing-tight: -0.02em;
  --letter-spacing-normal: 0;
  --letter-spacing-wide: 0.01em;
  
  /* Spacing */
  --space-2: 8px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;
  --space-12: 48px;
  --space-16: 64px;
  --space-24: 96px;
  --space-32: 128px;
  
  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-hover: 0 10px 15px rgba(0, 0, 0, 0.1), 0 4px 6px rgba(0, 0, 0, 0.05);
  --shadow-modal: 0 20px 25px rgba(0, 0, 0, 0.1), 0 10px 10px rgba(0, 0, 0, 0.04);
  
  /* Animation */
  --duration-fast: 200ms;
  --duration-normal: 250ms;
  --duration-slow: 300ms;
  --easing-default: ease-out;
  --easing-smooth: ease-in-out;
  
  /* Container */
  --container-max-width: 1280px;
  --container-padding-desktop: 64px;
  --container-padding-mobile: 24px;
}

/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-regular);
  line-height: var(--line-height-normal);
  color: var(--color-neutral-900);
  background-color: var(--color-bg-page);
  overflow-x: hidden;
}

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

a {
  color: var(--color-primary-500);
  text-decoration: none;
  transition: color var(--duration-fast) var(--easing-default);
}

a:hover {
  color: var(--color-primary-600);
}

/* Container */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding-desktop);
}

/* Preloader */
.preloader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--color-bg-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity var(--duration-slow) var(--easing-smooth);
}

.preloader.hidden {
  opacity: 0;
  pointer-events: none;
}

.preloader-content {
  text-align: center;
}

.logo {
  font-size: var(--font-size-title);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary-500);
  margin-bottom: var(--space-8);
  animation: pulse 1s ease-in-out infinite alternate;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-neutral-200);
  border-top: 3px solid var(--color-primary-500);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto;
}

@keyframes pulse {
  0% {
    opacity: 0.5;
    transform: scale(0.95);
  }
  100% {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 72px;
  background-color: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-neutral-200);
  z-index: 100;
  transition: box-shadow var(--duration-normal) var(--easing-default);
}

.nav.scrolled {
  box-shadow: var(--shadow-sm);
}

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

.nav-logo .logo-text {
  font-size: var(--font-size-subtitle);
  font-weight: var(--font-weight-bold);
  color: var(--color-neutral-900);
}

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

.nav-link {
  font-weight: var(--font-weight-medium);
  color: var(--color-neutral-700);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  transition: all var(--duration-fast) var(--easing-default);
}

.nav-link:hover {
  color: var(--color-primary-500);
  background-color: var(--color-primary-50);
}

.nav-cta {
  padding: var(--space-3) var(--space-6);
  background-color: var(--color-primary-500);
  color: white;
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-md);
  transition: all var(--duration-fast) var(--easing-default);
}

.nav-cta:hover {
  background-color: var(--color-primary-600);
  color: white;
  transform: translateY(-2px);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  cursor: pointer;
  gap: 4px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background-color: var(--color-neutral-900);
  transition: all var(--duration-fast) var(--easing-default);
}

/* Hero Section */
.hero {
  position: relative;
  min-height: 500px;
  padding: var(--space-32) 0;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: -1;
}

.hero-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.1;
}

.hero-content {
  position: relative;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
  z-index: 1;
}

.hero-headline {
  font-size: var(--font-size-hero);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  letter-spacing: var(--letter-spacing-tight);
  color: var(--color-neutral-900);
  margin-bottom: var(--space-6);
}

.hero-subheadline {
  font-size: var(--font-size-body-lg);
  font-weight: var(--font-weight-regular);
  line-height: var(--line-height-relaxed);
  color: var(--color-neutral-700);
  margin-bottom: var(--space-8);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4) var(--space-8);
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--duration-fast) var(--easing-default);
  cursor: pointer;
  border: none;
  min-height: 56px;
}

.btn-primary {
  background-color: var(--color-primary-500);
  color: white;
}

.btn-primary:hover {
  background-color: var(--color-primary-600);
  color: white;
  transform: translateY(-2px);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-primary-500);
  border: 2px solid var(--color-primary-500);
}

.btn-secondary:hover {
  background-color: var(--color-primary-500);
  color: white;
}

.btn-full {
  width: 100%;
}

/* Sections */
section {
  padding: var(--space-24) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-12);
}

.section-title {
  font-size: var(--font-size-title);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-snug);
  letter-spacing: var(--letter-spacing-tight);
  color: var(--color-neutral-900);
  margin-bottom: var(--space-6);
}

.section-subtitle {
  font-size: var(--font-size-body-lg);
  color: var(--color-neutral-700);
  max-width: 600px;
  margin: 0 auto;
}

/* Services Section */
.services {
  background-color: var(--color-bg-page);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
  margin-top: var(--space-12);
}

.service-card {
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  text-align: center;
  transition: all var(--duration-normal) var(--easing-default);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary-500), var(--color-primary-600));
  transform: scaleX(0);
  transition: transform var(--duration-normal) var(--easing-default);
}

.service-card:hover::before {
  transform: scaleX(1);
}

.service-card:hover {
  transform: translateY(-4px) scale(1.02);
  box-shadow: var(--shadow-hover);
  border-color: var(--color-primary-100);
}

.service-icon {
  color: var(--color-primary-500);
  margin-bottom: var(--space-4);
  display: flex;
  justify-content: center;
}

.service-title {
  font-size: var(--font-size-subtitle);
  font-weight: var(--font-weight-semibold);
  color: var(--color-neutral-900);
  margin-bottom: var(--space-4);
}

.service-description {
  color: var(--color-neutral-700);
  line-height: var(--line-height-normal);
}

/* About Section */
.about {
  background-color: var(--color-neutral-100);
}

.about-content {
  display: grid;
  grid-template-columns: 5fr 7fr;
  gap: var(--space-12);
  align-items: center;
}

.about-image {
  position: relative;
}

.portrait {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.about-text {
  padding-left: var(--space-8);
}

.about-subtitle {
  font-size: var(--font-size-subtitle);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary-500);
  margin-bottom: var(--space-6);
}

.about-description {
  font-size: var(--font-size-body);
  color: var(--color-neutral-700);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-6);
}

.about-contact {
  margin-top: var(--space-8);
}

.contact-item {
  margin-bottom: var(--space-4);
}

.contact-item strong {
  color: var(--color-neutral-900);
  font-weight: var(--font-weight-semibold);
}

.contact-item a {
  color: var(--color-primary-500);
  font-weight: var(--font-weight-medium);
}

/* Contact Section */
.contact {
  background-color: var(--color-bg-page);
}

.contact-content {
  display: grid;
  grid-template-columns: 6fr 6fr;
  gap: var(--space-12);
  margin-top: var(--space-12);
}

.contact-form-container {
  background-color: var(--color-bg-surface);
  padding: var(--space-12);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.form-group {
  display: flex;
  flex-direction: column;
}

.form-label {
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-medium);
  color: var(--color-neutral-700);
  margin-bottom: var(--space-2);
}

.form-input,
.form-textarea {
  padding: var(--space-4);
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  font-family: var(--font-family-primary);
  font-size: var(--font-size-body);
  background-color: var(--color-bg-surface);
  transition: border-color var(--duration-fast) var(--easing-default);
  min-height: 52px;
}

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

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-primary-500);
  box-shadow: 0 0 0 2px var(--color-primary-100);
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.info-item h4 {
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-semibold);
  color: var(--color-neutral-900);
  margin-bottom: var(--space-2);
}

.info-item p {
  color: var(--color-neutral-700);
  line-height: var(--line-height-relaxed);
}

/* Footer */
.footer {
  background-color: var(--color-neutral-900);
  color: var(--color-neutral-300);
  padding: var(--space-12) 0 var(--space-8);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-8);
}

.footer-logo .logo-text {
  color: var(--color-neutral-300);
  font-size: var(--font-size-subtitle);
  font-weight: var(--font-weight-bold);
}

.footer-links {
  display: flex;
  gap: var(--space-6);
}

.footer-link {
  color: var(--color-neutral-300);
  font-size: var(--font-size-small);
  transition: color var(--duration-fast) var(--easing-default);
}

.footer-link:hover {
  color: var(--color-primary-100);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-neutral-700);
}

.footer-bottom p {
  font-size: var(--font-size-caption);
  color: var(--color-neutral-500);
}

/* Modals */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1000;
}

.modal.active {
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  opacity: 0;
  transition: opacity var(--duration-slow) var(--easing-smooth);
}

.modal.active .modal-overlay {
  opacity: 1;
}

.modal-content {
  background-color: var(--color-bg-surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-modal);
  max-width: 640px;
  max-height: 80vh;
  width: 90%;
  overflow: hidden;
  transform: scale(0.95);
  transition: transform var(--duration-slow) var(--easing-smooth);
  position: relative;
  z-index: 1;
}

.modal.active .modal-content {
  transform: scale(1);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-6);
  border-bottom: 1px solid var(--color-neutral-200);
}

.modal-header h3 {
  font-size: var(--font-size-subtitle);
  font-weight: var(--font-weight-bold);
  color: var(--color-neutral-900);
}

.modal-close {
  background: none;
  border: none;
  font-size: 24px;
  color: var(--color-neutral-500);
  cursor: pointer;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  transition: all var(--duration-fast) var(--easing-default);
}

.modal-close:hover {
  background-color: var(--color-neutral-100);
  color: var(--color-neutral-700);
}

.modal-body {
  padding: var(--space-6);
  max-height: 60vh;
  overflow-y: auto;
}

.modal-body h4 {
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-semibold);
  color: var(--color-neutral-900);
  margin-bottom: var(--space-4);
  margin-top: var(--space-6);
}

.modal-body h4:first-child {
  margin-top: 0;
}

.modal-body p {
  color: var(--color-neutral-700);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-4);
}

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-on-scroll {
  animation: fadeInUp var(--duration-normal) var(--easing-default);
}

/* Responsive Design */
@media (max-width: 1280px) {
  :root {
    --font-size-hero: 56px;
    --font-size-title: 40px;
    --font-size-subtitle: 28px;
  }
}

@media (max-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .about-content {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }
  
  .about-text {
    padding-left: 0;
    text-align: center;
  }
  
  .contact-content {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }
}

@media (max-width: 768px) {
  :root {
    --font-size-hero: 40px;
    --font-size-title: 32px;
    --font-size-subtitle: 24px;
    --font-size-body-lg: 18px;
    --container-padding-desktop: var(--container-padding-mobile);
    --space-24: 56px;
    --space-32: 80px;
  }
  
  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-bg-surface);
    border-top: 1px solid var(--color-neutral-200);
    flex-direction: column;
    padding: var(--space-6);
    box-shadow: var(--shadow-card);
  }
  
  .nav-menu.active {
    display: flex;
  }
  
  .nav-toggle {
    display: flex;
  }
  
  .hero {
    padding: var(--space-24) 0;
  }
  
  .hero-cta {
    flex-direction: column;
    align-items: center;
  }
  
  .btn {
    width: 100%;
    max-width: 280px;
  }
  
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-4);
  }
  
  .service-card {
    padding: var(--space-6);
  }
  
  .footer-content {
    flex-direction: column;
    gap: var(--space-6);
    text-align: center;
  }
  
  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .services-grid {
    grid-template-columns: 1fr;
  }
  
  .modal-content {
    width: 95%;
    margin: var(--space-4);
  }
  
  .modal-body {
    padding: var(--space-4);
  }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  .service-card:hover {
    transform: none;
  }
  
  .btn:hover {
    transform: none;
  }
}

/* Form Validation Styles */
.form-input:invalid:not(:placeholder-shown),
.form-textarea:invalid:not(:placeholder-shown) {
  border-color: var(--color-error);
}

.form-input:valid:not(:placeholder-shown),
.form-textarea:valid:not(:placeholder-shown) {
  border-color: var(--color-success);
}

/* Focus States for Accessibility */
.nav-link:focus,
.btn:focus,
.form-input:focus,
.form-textarea:focus,
.footer-link:focus {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
}

/* Loading States */
.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none !important;
}

.form-input:disabled,
.form-textarea:disabled {
  background-color: var(--color-neutral-100);
  cursor: not-allowed;
}