:root {
  --primary: #4361ee;
  --secondary: #3f37c9;
  --text: #2b2d42;
  --muted: #8d99ae;
  --bg: #f8f9fa;
  --white: #ffffff;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Segoe UI", sans-serif;
}
body {
  background-color: var(--bg);
  color: var(--text);
  overflow-x: hidden;
}

#loader-overlay {
  position: fixed;
  inset: 0;
  background: var(--white);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9999;
  transition:
    opacity 0.5s ease,
    visibility 0.5s;
}

#loader-overlay.fade-out {
  opacity: 0;
  visibility: hidden;
}
.loader-content {
  text-align: center;
}
.spinner {
  width: 50px;
  height: 50px;
  border: 5px solid #f3f3f3;
  border-top: 5px solid var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 20px;
}
@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

.landing-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}
.landing-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 30px 0;
}
.logo h2 {
  color: var(--primary);
  font-weight: 800;
}
.logo span {
  color: var(--text);
}
.btn-login {
  text-decoration: none;
  color: var(--primary);
  font-weight: 600;
  padding: 10px 25px;
  border: 2px solid var(--primary);
  border-radius: 30px;
  transition: 0.3s;
}
.btn-login:hover {
  background: var(--primary);
  color: var(--white);
}

.hero {
  text-align: center;
  padding: 80px 0;
  max-width: 800px;
  margin: 0 auto;
}
.hero h1 {
  font-size: 3.5rem;
  line-height: 1.2;
  margin-bottom: 20px;
}
.hero h1 span {
  color: var(--primary);
}
.hero p {
  font-size: 1.2rem;
  color: var(--muted);
  margin-bottom: 40px;
}
.hero-buttons {
  display: flex;
  gap: 20px;
  justify-content: center;
}
.btn-primary {
  text-decoration: none;
  background: var(--primary);
  color: var(--white);
  padding: 15px 35px;
  border-radius: 30px;
  font-weight: 600;
  box-shadow: 0 10px 20px rgba(67, 97, 238, 0.2);
  transition: 0.3s;
}
.btn-secondary {
  text-decoration: none;
  background: var(--white);
  color: var(--text);
  padding: 15px 35px;
  border-radius: 30px;
  font-weight: 600;
  border: 1px solid #ddd;
  transition: 0.3s;
}
.btn-primary:hover {
  transform: translateY(-3px);
}

.dashboard-preview {
  margin-top: 50px;
  perspective: 1000px;
}
.preview-window {
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.12);
  overflow: hidden;
  border: 1px solid #eee;
  transform: rotateX(5deg);
}
.window-header {
  background: #f1f1f1;
  padding: 12px 20px;
  display: flex;
  gap: 8px;
}
.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}
.red {
  background: #ff5f56;
}
.yellow {
  background: #ffbd2e;
}
.green {
  background: #27c93f;
}
.preview-image {
  padding: 20px;
  background: #f8f9fa;
}

.skeleton-dashboard {
  display: flex;
  gap: 20px;
  height: 400px;
}
.sk-sidebar {
  width: 200px;
  background: #fff;
  border-radius: 8px;
  padding: 20px;
}
.sk-line {
  height: 15px;
  background: #eee;
  margin-bottom: 15px;
  border-radius: 4px;
}
.sk-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.sk-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.sk-card {
  height: 100px;
  background: #fff;
  border-radius: 8px;
}
.sk-main-area {
  flex: 1;
  background: #fff;
  border-radius: 8px;
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
  padding: 100px 0;
}
.feature-card {
  background: var(--white);
  padding: 40px;
  border-radius: 20px;
  text-align: center;
  transition: 0.3s;
  border: 1px solid #f0f0f0;
}
.feature-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.05);
}
.feature-icon {
  font-size: 3rem;
  margin-bottom: 20px;
}
.landing-footer {
  text-align: center;
  padding: 50px 0;
  border-top: 1px solid #eee;
  color: var(--muted);
}

@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.5rem;
  }
  .hero-buttons {
    flex-direction: column;
  }
  .sk-sidebar {
    display: none;
  }
  .sk-cards {
    grid-template-columns: 1fr;
  }
}