/* ==========================================
   CSS VARIABLES (Design System)
   ========================================== */
:root {
  /* Colors */
  --color-primary: #2563EB;
  --color-primary-dark: #1E40AF;
  --color-accent: #10B981;
  --color-dark: #0F172A;
  --color-light: #F8FAFC;
  --color-text: #475569;
  --color-border: #E2E8F0;
  --color-white: #FFFFFF;
  --color-error: #EF4444;
  --color-success: #10B981;

  /* Typography */
  --font-family: 'Inter', system-ui, -apple-system, sans-serif;
  --font-size-base: 1rem;
  --line-height-base: 1.6;

  /* Spacing */
  --spacing-unit: 1rem;
  --max-width: 1200px;

  /* Borders */
  --border-radius: 0.5rem;
  --border-radius-lg: 0.75rem;

  /* Transitions */
  --transition: all 0.3s ease;
}

/* ==========================================
   GLOBAL RESET & BASE STYLES
   ========================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--color-text);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ==========================================
   TYPOGRAPHY
   ========================================== */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-dark);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
}

h1 {
  font-size: 2.5rem;
  font-weight: 800;
}

h2 {
  font-size: 1.875rem;
}

h3 {
  font-size: 1.5rem;
}

p {
  margin-bottom: 1rem;
}

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

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

/* ==========================================
   LAYOUT UTILITIES
   ========================================== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section-title {
  text-align: center;
  margin-bottom: 3rem;
  font-size: 2rem;
}

/* ==========================================
   NAVIGATION
   ========================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: transparent;
  z-index: 1000;
  padding: 1rem 0;
  transition: var(--transition);
}

.navbar.scrolled {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

.navbar-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.navbar-logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-white);
  text-decoration: none;
  transition: var(--transition);
}

.navbar.scrolled .navbar-logo {
  color: var(--color-dark);
}

.navbar-logo:hover {
  opacity: 0.8;
}

.navbar.scrolled .navbar-logo:hover {
  color: var(--color-primary);
  opacity: 1;
}

.navbar-menu {
  display: flex;
  list-style: none;
  gap: 2rem;
  align-items: center;
}

.navbar-menu li a {
  color: var(--color-white);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
  padding: 0.5rem 0;
}

.navbar.scrolled .navbar-menu li a {
  color: var(--color-text);
}

.navbar-menu li a:hover {
  opacity: 0.8;
}

.navbar.scrolled .navbar-menu li a:hover {
  color: var(--color-primary);
  opacity: 1;
}

.navbar-cta {
  background-color: var(--color-primary);
  color: var(--color-white) !important;
  padding: 0.5rem 1.5rem !important;
  border-radius: var(--border-radius);
  font-weight: 600;
}

.navbar-cta:hover {
  background-color: var(--color-primary-dark);
  color: var(--color-white) !important;
  transform: translateY(-2px);
}

/* ==========================================
   BUTTONS
   ========================================== */
.btn {
  display: inline-block;
  padding: 1rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  text-align: center;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: var(--transition);
  border: none;
  text-decoration: none;
  min-height: 44px;
  min-width: 44px;
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-white);
  box-shadow: 0 4px 6px rgba(37, 99, 235, 0.2);
}

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 12px rgba(37, 99, 235, 0.3);
  color: var(--color-white);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-submit {
  width: 100%;
  margin-top: 1rem;
}

.btn-submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* ==========================================
   HERO SECTION
   ========================================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #0F172A 0%, #1E293B 100%);
  color: var(--color-white);
  padding: 4rem 0;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(circle at 20% 50%, rgba(37, 99, 235, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 50%, rgba(16, 185, 129, 0.1) 0%, transparent 50%);
  pointer-events: none;
}

/* Background image layer (add after you have the image) */
.hero::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: url('/images/hero-background.jpg');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  opacity: 0.15;
  pointer-events: none;
  z-index: 0;
}

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

.hero-title {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-white);
  margin-bottom: 1.5rem;
  line-height: 1.1;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: #CBD5E1;
  margin-bottom: 2.5rem;
  line-height: 1.6;
}

/* ==========================================
   SERVICES SECTION
   ========================================== */
.services {
  padding: 6rem 0;
  background-color: var(--color-white);
}

.services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

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

.service-card:hover {
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  transform: translateY(-5px);
  border-color: var(--color-primary);
}

.service-icon {
  color: var(--color-primary);
  margin-bottom: 1.5rem;
}

.service-title {
  color: var(--color-dark);
  margin-bottom: 1rem;
  font-size: 1.5rem;
}

.service-description {
  color: var(--color-text);
  margin-bottom: 1.5rem;
  font-size: 1rem;
  line-height: 1.6;
}

.service-features {
  list-style: none;
  padding: 0;
}

.service-features li {
  position: relative;
  padding-left: 1.75rem;
  margin-bottom: 0.75rem;
  color: var(--color-text);
}

.service-features li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: 700;
  font-size: 1.1rem;
}

/* ==========================================
   WHY CHOOSE US SECTION
   ========================================== */
.why-us {
  padding: 6rem 0;
  background-color: var(--color-white);
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  max-width: 900px;
  margin: 0 auto;
}

.feature-card {
  position: relative;
  background: var(--color-white);
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: 2.5rem;
  transition: var(--transition);
  text-align: left;
}

.feature-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.1);
  transform: translateX(8px);
}

.feature-number {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-primary);
  background: rgba(37, 99, 235, 0.1);
  padding: 0.25rem 0.75rem;
  border-radius: 2rem;
  margin-bottom: 1rem;
  letter-spacing: 0.5px;
}

.feature-title {
  color: var(--color-dark);
  margin-bottom: 0.75rem;
  font-size: 1.375rem;
  font-weight: 700;
}

.feature-description {
  color: var(--color-text);
  line-height: 1.7;
  font-size: 1rem;
  margin: 0;
}

/* ==========================================
   CONTACT SECTION
   ========================================== */
.contact {
  padding: 6rem 0;
  background: linear-gradient(135deg, #0F172A 0%, #1E293B 100%);
  color: var(--color-white);
}

.contact .section-title {
  color: var(--color-white);
  margin-bottom: 1rem;
}

.contact-subtitle {
  text-align: center;
  color: #CBD5E1;
  font-size: 1.125rem;
  margin-bottom: 3rem;
}

.contact-content {
  max-width: 700px;
  margin: 0 auto;
}

.contact-form {
  background: var(--color-white);
  padding: 3rem;
  border-radius: var(--border-radius-lg);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  color: var(--color-dark);
  font-weight: 500;
  font-size: 0.875rem;
  line-height: 1.4;
}

.required {
  color: var(--color-error);
  margin-left: 2px;
}

.form-group input,
.form-group select,
.form-group textarea {
  padding: 0.625rem 0.75rem;
  font-size: 0.875rem;
  border: 1px solid #E2E8F0;
  border-radius: 0.375rem;
  font-family: var(--font-family);
  transition: all 0.15s ease;
  background-color: var(--color-white);
  color: var(--color-dark);
  line-height: 1.5;
}

.form-group input:hover,
.form-group select:hover,
.form-group textarea:hover {
  border-color: #CBD5E1;
}

.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, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: #94A3B8;
}

.form-group select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23475569' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  background-size: 12px;
  padding-right: 2.5rem;
  cursor: pointer;
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

.error-message {
  color: var(--color-error);
  font-size: 0.75rem;
  margin-top: -0.25rem;
  display: none;
  font-weight: 500;
}

.error-message.visible {
  display: block;
}

.form-group input.error,
.form-group select.error,
.form-group textarea.error {
  border-color: var(--color-error);
  background-color: #FEF2F2;
}

.form-group input.error:focus,
.form-group select.error:focus,
.form-group textarea.error:focus {
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.success-message,
.form-error-message {
  padding: 1rem;
  border-radius: var(--border-radius);
  margin-top: 1.5rem;
  text-align: center;
  font-weight: 500;
}

.success-message {
  background-color: #D1FAE5;
  color: #065F46;
  border: 1px solid var(--color-success);
}

.form-error-message {
  background-color: #FEE2E2;
  color: #991B1B;
  border: 1px solid var(--color-error);
}

.privacy-note {
  text-align: center;
  color: #94A3B8;
  font-size: 0.875rem;
  margin-top: 1.5rem;
  margin-bottom: 0;
}

/* ==========================================
   FOOTER
   ========================================== */
.footer {
  padding: 2rem 0;
  background-color: var(--color-dark);
  color: #94A3B8;
  text-align: center;
}

.footer-text {
  margin: 0;
  font-size: 0.875rem;
}

/* ==========================================
   RESPONSIVE DESIGN
   ========================================== */

/* Tablet: 768px+ */
@media (min-width: 768px) {
  .hero-title {
    font-size: 3rem;
  }

  .hero-subtitle {
    font-size: 1.375rem;
  }

  .section-title {
    font-size: 2.5rem;
  }

  .services-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 2.5rem;
  }

  .features-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 2.5rem;
  }

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

/* Desktop: 1024px+ */
@media (min-width: 1024px) {
  .hero-title {
    font-size: 3.5rem;
  }

  .hero-subtitle {
    font-size: 1.5rem;
  }

  .services {
    padding: 8rem 0;
  }

  .why-us {
    padding: 8rem 0;
  }

  .contact {
    padding: 8rem 0;
  }
}

/* ==========================================
   ACCESSIBILITY
   ========================================== */

/* Focus visible styles for keyboard navigation */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  .btn-primary {
    border: 2px solid var(--color-white);
  }

  .service-card,
  .contact-form {
    border-width: 2px;
  }
}