@import url('https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.0.0-beta3/css/all.min.css');

:root {
  /* Variant 1: Light Theme - Blue/Green */
  --primary-color: #3498DB;    /* Main Blue */
  --secondary-color: #2980B9;  /* Darker Blue */
  --accent-color: #2ECC71;     /* Green */
  --light-color: #EBF5FB;      /* Light Blue/White */
  --dark-color: #2C3E50;       /* Dark Grey/Blue */
  --gradient-primary: linear-gradient(135deg, #3498DB 0%, #2ECC71 100%);
  --hover-color: #2980B9;
  --background-color: #FFFFFF;
  --text-color: #34495E;
  --border-color: rgba(52, 152, 219, 0.2);
  --divider-color: rgba(44, 62, 80, 0.1);
  --shadow-color-dark: rgba(44, 62, 80, 0.1);
  --shadow-color-light: #FFFFFF;
  --highlight-color: #F1C40F;  /* Yellow */
  --main-font: 'Oswald', sans-serif;
  --alt-font: 'Open Sans', sans-serif;
}

body {
  font-family: var(--alt-font);
  line-height: 1.7;
  font-display: swap;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--main-font);
  font-weight: 500;
  line-height: 1.3;
}

/* Neuromorphism Cards */
.neu-card {
  background-color: var(--background-color);
  border-radius: 20px;
  padding: 1.5rem;
  box-shadow: 10px 10px 20px var(--shadow-color-dark), 
              -10px -10px 20px var(--shadow-color-light);
  transition: all 0.3s ease;
}

.neu-card:hover {
  transform: translateY(-5px);
  box-shadow: 15px 15px 30px var(--shadow-color-dark), 
              -15px -15px 30px var(--shadow-color-light);
}

.neu-card-inset {
  border-radius: 20px;
  box-shadow: inset 8px 8px 15px var(--shadow-color-dark), 
              inset -8px -8px 15px var(--shadow-color-light);
}

/* Section Padding */
.section-padding {
  padding-top: 10dvh;
  padding-bottom: 10dvh;
}

/* Header & Footer */
.header, .footer {
  padding: 1.5rem 0;
}
.nav-link {
  padding: 0.5rem 0.75rem;
  transition: color 0.3s ease, text-decoration 0.3s ease;
  color: var(--light-color);
  text-decoration: none;
  position: relative;
}
.nav-link:hover {
  color: var(--highlight-color);
  text-decoration: underline;
}

.footer-nav ul {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
}

/* Mobile Navigation (CSS-Only) */
.nav-toggle {
  display: none;
}
.nav-toggle-label {
  display: none; /* Hide by default */
  cursor: pointer;
  z-index: 1001;
}
.nav-toggle-label span,
.nav-toggle-label span:before,
.nav-toggle-label span:after {
  content: '';
  display: block;
  height: 3px;
  width: 25px;
  background: var(--light-color);
  position: relative;
  transition: all 0.3s ease;
}
.nav-toggle-label span:before {
  top: -8px;
}
.nav-toggle-label span:after {
  top: 5px; /* (8px - 3px) */
}

/* Timeline */
.timeline {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
}
.timeline::after {
  content: '';
  position: absolute;
  width: 4px;
  background-color: var(--accent-color);
  top: 0;
  bottom: 0;
  left: 50%;
  margin-left: -2px;
  opacity: 0.5;
}
.timeline-item {
  padding: 10px 40px;
  position: relative;
  width: 50%;
}
.timeline-item:nth-child(odd) {
  left: 0;
}
.timeline-item:nth-child(even) {
  left: 50%;
}
.timeline-item::after {
  content: '';
  position: absolute;
  width: 20px;
  height: 20px;
  right: -10px;
  background-color: var(--background-color);
  border: 4px solid var(--accent-color);
  top: 25px;
  border-radius: 50%;
  z-index: 1;
}
.timeline-item:nth-child(even)::after {
  left: -10px;
}
.timeline-content {
  position: relative;
}

/* Form */
.form-input {
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: 10px;
  background-color: var(--background-color);
  border: 1px solid var(--border-color);
  color: var(--text-color);
  box-shadow: inset 4px 4px 8px var(--shadow-color-dark), 
              inset -4px -4px 8px var(--shadow-color-light);
  transition: all 0.3s ease;
}
.form-input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: inset 6px 6px 10px var(--shadow-color-dark), 
              inset -6px -6px 10px var(--shadow-color-light),
              0 0 0 2px var(--primary-color);
}

/* Button */
.btn {
  padding: 0.75rem 1.5rem;
  border-radius: 10px;
  font-weight: 600;
  font-family: var(--main-font);
  transition: all 0.3s ease;
  cursor: pointer;
  text-transform: uppercase;
}
.btn-primary {
  background-color: var(--primary-color);
  color: white;
  border: none;
  box-shadow: 6px 6px 12px var(--shadow-color-dark), 
              -6px -6px 12px var(--shadow-color-light);
}
.btn-primary:hover {
  background-color: var(--hover-color);
  transform: translateY(-2px);
  box-shadow: 8px 8px 15px var(--shadow-color-dark), 
              -8px -8px 15px var(--shadow-color-light);
}

/* Responsive */
@media (max-width: 768px) {
  .header .container {
    flex-wrap: wrap;
    justify-content: center;
  }
  .header .logo {
    width: 100%;
    text-align: center;
    margin-bottom: 1rem;
  }
  .nav-toggle-label {
    display: block;
    position: absolute;
    top: 1.75rem;
    right: 1.5rem;
  }
  .navigation {
    width: 100%;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease-out;
  }
  .navigation ul {
    flex-direction: column;
    text-align: center;
    padding: 1rem 0;
  }
  .nav-toggle:checked ~ .navigation {
    max-height: 500px;
  }
  .nav-toggle:checked ~ .nav-toggle-label span {
    background: transparent;
  }
  .nav-toggle:checked ~ .nav-toggle-label span:before {
    transform: rotate(45deg);
    top: 0;
  }
  .nav-toggle:checked ~ .nav-toggle-label span:after {
    transform: rotate(-45deg);
    top: -3px;
  }

  .footer {
    text-align: center;
  }
  .footer-nav ul {
    flex-direction: column;
  }
  .footer-nav li {
    margin: 0.25rem 0;
  }

  .timeline::after {
    left: 20px;
    margin-left: 0;
  }
  .timeline-item {
    width: 100%;
    padding-left: 50px;
    padding-right: 10px;
  }
  .timeline-item:nth-child(even) {
    left: 0;
  }
  .timeline-item::after {
    left: 10px;
  }
}