:root {
  --primary-color: #1e3a8a; /* Slate 900 / Deep Blue */
  --primary-light: #3b82f6; /* Blue 500 */
  --secondary-color: #f1f5f9; /* Slate 100 */
  --text-dark: #0f172a; /* Slate 900 */
  --text-light: #64748b; /* Slate 500 */
  --white: #ffffff;
  --success: #10b981;
  --transition: all 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-dark);
  background-color: var(--secondary-color);
  overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
}

h1 {
  font-size: 3.5rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 2.5rem;
  text-align: center;
  color: var(--primary-color);
}

p {
  font-size: 1.125rem;
  color: var(--text-light);
  margin-bottom: 1.5rem;
}

/* Base Components */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.btn {
  display: inline-block;
  padding: 0.875rem 2rem;
  border-radius: 9999px;
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background-color: var(--primary-color);
  color: var(--white);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.btn-primary:hover {
  background-color: var(--primary-light);
  transform: translateY(-2px);
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

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

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

/* Header & Navigation */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  border-bottom: 1px solid rgba(0,0,0,0.05);
  transition: var(--transition);
}

header.scrolled {
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

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

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary-color);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

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

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

.nav-links a {
  text-decoration: none;
  color: var(--text-dark);
  font-weight: 500;
  transition: var(--transition);
}

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

.login-btn {
  background-color: var(--primary-light);
  color: white !important;
  padding: 0.5rem 1.5rem;
  border-radius: 9999px;
  font-weight: 600;
}

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

/* Mobile Menu */
.hamburger {
  display: none;
  cursor: pointer;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--primary-color);
}

/* Hero Section */
.hero {
  padding: 160px 0 100px;
  background: linear-gradient(135deg, var(--secondary-color) 0%, var(--white) 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

/* Decorative background blur */
.hero::before {
  content: '';
  position: absolute;
  top: -10%;
  right: -5%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(59,130,246,0.15) 0%, rgba(255,255,255,0) 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero-content {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.5fr);
  gap: 2rem;
  align-items: center;
}

.hero-text h1 {
  color: var(--primary-color);
  margin-bottom: 1.5rem;
  animation: fadeUp 0.8s ease forwards;
  opacity: 0;
  min-width: 0;
}

.hero-text p {
  font-size: 1.25rem;
  margin-bottom: 2.5rem;
  animation: fadeUp 0.8s ease 0.2s forwards;
  opacity: 0;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  animation: fadeUp 0.8s ease 0.4s forwards;
  opacity: 0;
}

/* Hero Image Mockup (Pre-rendered images) */
.hero-image-wrapper {
  position: relative;
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  animation: fadeIn 1.2s ease 0.3s forwards;
  opacity: 0;
  /* Aspect ratio trick to preserve space, laptop_1.webp is 2134x1393 */
  aspect-ratio: 2134 / 1393;
}

.hero-slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  opacity: 0;
  /* 4 images * 2 seconds each = 8 seconds total loop */
  animation: heroCrossfade 8s infinite;
}

/* Delays for each of the 4 images (2 seconds apart) */
.slide-1 { animation-delay: 0s; }
.slide-2 { animation-delay: 2s; }
.slide-3 { animation-delay: 4s; }
.slide-4 { animation-delay: 6s; }

/* 2s per image in an 8s loop */
@keyframes heroCrossfade {
  0%   { opacity: 0; }
  5%   { opacity: 1; }
  25%  { opacity: 1; }
  30%  { opacity: 0; }
  100% { opacity: 0; }
}

/* Features Section */
.features {
  padding: 100px 0;
  background-color: white;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.5rem;
  margin-top: 4rem;
}

.feature-card {
  background-color: var(--secondary-color);
  padding: 2.5rem 2rem;
  border-radius: 16px;
  transition: var(--transition);
  text-align: center;
}

.feature-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  background-color: white;
  border: 1px solid rgba(0,0,0,0.05);
}

.feature-img {
  width: 100%;
  height: auto;
  border-radius: 8px;
  margin-bottom: 1.5rem;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  border: 1px solid rgba(0,0,0,0.05);
  transition: transform 0.3s ease;
}

.feature-card:hover .feature-img {
  transform: scale(1.02);
}

.feature-card h3 {
  color: var(--primary-color);
  font-size: 1.25rem;
}

/* Call To Action */
.cta {
  padding: 100px 0;
  background-color: var(--primary-color);
  color: white;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(45deg, rgba(59,130,246,0.3) 0%, transparent 100%);
  pointer-events: none;
}

.cta h2 {
  color: white;
}

.cta p {
  color: rgba(255,255,255,0.8);
  max-width: 600px;
  margin: 0 auto 2rem;
}

/* Footer Section */
footer {
  background-color: #0f172a;
  color: #94a3b8;
  padding: 4rem 0 2rem;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-col h3 {
  color: white;
  font-size: 1.25rem;
  margin-bottom: 1.5rem;
}

.footer-col p {
  color: #94a3b8;
  font-size: 0.95rem;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.75rem;
}

.footer-links a {
  color: #94a3b8;
  text-decoration: none;
  transition: var(--transition);
}

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

.legal-short {
    font-size: 0.85rem;
    line-height: 1.5;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 2rem;
  text-align: center;
  font-size: 0.875rem;
}

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

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* Responsive Design */
@media (max-width: 968px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .hero-buttons {
    justify-content: center;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  h1 { font-size: 2.5rem; }
  h2 { font-size: 2rem; }
  
  .hamburger {
    display: block;
  }
  
  .nav-links {
    display: none;
    position: absolute;
    top: 80px;
    left: 0;
    width: 100%;
    background: white;
    flex-direction: column;
    padding: 2rem;
    box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1);
  }
  
  .nav-links.active {
    display: flex;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: 2rem;
    text-align: center;
  }
}

/* --- Image Lightbox Modal --- */
.feature-img {
  cursor: zoom-in;
}

.image-modal {
  display: flex;
  position: fixed;
  z-index: 9999;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(15, 23, 42, 0.9);
  backdrop-filter: blur(5px);
  justify-content: center;
  align-items: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.image-modal.active {
  opacity: 1;
  pointer-events: auto;
}

.image-modal-content {
  position: relative;
  max-width: 90%;
  max-height: 90vh;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  border-radius: 8px;
  transform: scale(0.95);
  transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

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

.image-modal-content img {
  display: block;
  max-width: 100%;
  max-height: 90vh;
  border-radius: 8px;
  object-fit: contain;
}

.close-modal {
  position: absolute;
  top: -40px;
  right: 0;
  color: #fff;
  font-size: 2rem;
  font-weight: bold;
  cursor: pointer;
  transition: color 0.2s ease;
  background: none;
  border: none;
  padding: 0;
}

.close-modal:hover {
  color: var(--primary-light);
}