/* =============================================
   E-Learning Platform — Main Stylesheet
   Author: Clean & Secure
   ============================================= */

/* ---------- CSS Variables (easy to customize) ---------- */
:root {
  --color-primary:      #28a745;
  --color-primary-dark: #1e7e34;
  --color-primary-soft: #e9f7ed;
  --color-dark:         #1a1a2e;
  --color-text:         #444444;
  --color-muted:        #6c757d;
  --color-bg-light:     #f8f9fa;
  --color-bg-section:   #f1f8f3;
  --color-white:        #ffffff;
  --color-border:       #dee2e6;
  --shadow-sm:          0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md:          0 4px 20px rgba(0, 0, 0, 0.12);
  --radius:             10px;
  --transition:         all 0.3s ease;
  --font-main:          'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

/* ---------- Base Reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-main);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
}

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

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

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

/* ---------- Hero Header ---------- */
.hero-header {
  background: linear-gradient(135deg, var(--color-primary-soft) 0%, #ffffff 100%);
  border-bottom: 1px solid var(--color-border);
}

.hero-header h1 {
  line-height: 1.2;
  font-weight: 700;
}

.hero-header .lead {
  font-size: 1.05rem;
  color: var(--color-text);
}

/* ---------- Section Shared Styles ---------- */
section {
  padding: 60px 0;
}

.section-title {
  margin-bottom: 2.5rem;
}

.section-title h2 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-dark);
  position: relative;
  display: inline-block;
  padding-bottom: 12px;
}

.section-title h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 50px;
  height: 3px;
  background-color: var(--color-primary);
  border-radius: 2px;
}

.section-title p {
  color: var(--color-muted);
  font-size: 1rem;
  margin-top: 0.5rem;
}

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

.about img {
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  width: 100%;
  object-fit: cover;
  max-height: 420px;
}

.about h2 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-dark);
  line-height: 1.4;
}

.about p {
  color: var(--color-muted);
  font-size: 1rem;
}

/* ---------- Mission & Vision Section ---------- */
#mission-vision {
  background-color: var(--color-bg-light);
}

/* ---------- Values Section ---------- */
#values {
  background-color: var(--color-bg-section);
}

/* ---------- Icon Box (cards) ---------- */
.icon-box {
  background-color: var(--color-white);
  padding: 1.75rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  width: 100%;
  transition: var(--transition);
  border-left: 4px solid transparent;
}

.icon-box:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
  border-left-color: var(--color-primary);
}

.icon-box-green {
  border-left-color: var(--color-primary);
}

.icon-box h4,
.icon-box h5 {
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 0.75rem;
}

.icon-box p {
  color: var(--color-muted);
  font-size: 0.95rem;
  margin-bottom: 0;
  line-height: 1.7;
}

/* ---------- CTA Section ---------- */
.cta {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-white);
  padding: 50px 0;
}

.cta h3 {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 0.4rem;
}

.cta p {
  color: rgba(255, 255, 255, 0.9);
  font-size: 1rem;
  margin-bottom: 0;
}

.cta-btn {
  display: inline-block;
  background-color: var(--color-white);
  color: var(--color-primary-dark);
  font-weight: 600;
  padding: 0.75rem 1.75rem;
  border-radius: 50px;
  border: 2px solid var(--color-white);
  transition: var(--transition);
  white-space: nowrap;
}

.cta-btn:hover {
  background-color: transparent;
  color: var(--color-white);
}

/* ---------- Carousel ---------- */
#heroCarousel .carousel-inner {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

#heroCarousel img {
  width: 100%;
  height: 380px;
  object-fit: cover;
}

#heroCarousel .carousel-caption {
  bottom: 20px;
}

#heroCarousel .carousel-caption .btn {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  font-weight: 600;
  border-radius: 50px;
  padding: 0.5rem 1.5rem;
  color: var(--color-white);
}

#heroCarousel .carousel-caption .btn:hover {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
}

#heroCarousel .carousel-control-prev,
#heroCarousel .carousel-control-next {
  width: 40px;
  height: 40px;
  background-color: var(--color-primary);
  border-radius: 50%;
  top: 50%;
  transform: translateY(-50%);
  opacity: 1;
}

#heroCarousel .carousel-control-prev {
  left: 10px;
}

#heroCarousel .carousel-control-next {
  right: 10px;
}

#heroCarousel .carousel-indicators [data-bs-target] {
  background-color: var(--color-primary);
  width: 10px;
  height: 10px;
  border-radius: 50%;
  opacity: 0.5;
}

#heroCarousel .carousel-indicators .active {
  opacity: 1;
}

/* ---------- Buttons ---------- */
.btn-success {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  font-weight: 600;
  border-radius: 50px;
  padding: 0.6rem 1.75rem;
  transition: var(--transition);
}

.btn-success:hover,
.btn-success:focus {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  box-shadow: 0 4px 12px rgba(40, 167, 69, 0.35);
}

.btn-outline-success {
  color: var(--color-primary);
  border-color: var(--color-primary);
  font-weight: 600;
  border-radius: 50px;
  padding: 0.6rem 1.75rem;
  transition: var(--transition);
}

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

/* ---------- Utility ---------- */
.text-success {
  color: var(--color-primary) !important;
}

.bg-light {
  background-color: var(--color-bg-light) !important;
}

.shadow-sm {
  box-shadow: var(--shadow-sm) !important;
}

.rounded {
  border-radius: var(--radius) !important;
}

.fw-bold   { font-weight: 700 !important; }
.fw-semibold { font-weight: 600 !important; }

/* ---------- Responsive ---------- */
@media (max-width: 991.98px) {
  .hero-header {
    text-align: center;
  }

  .hero-header h1 {
    font-size: 2rem;
  }

  #heroCarousel img {
    height: 280px;
  }

  .about img {
    max-height: 300px;
    margin-bottom: 1.5rem;
  }

  section {
    padding: 40px 0;
  }

  .cta h3 {
    font-size: 1.4rem;
  }
}

@media (max-width: 575.98px) {
  .hero-header h1 {
    font-size: 1.6rem;
  }

  .section-title h2 {
    font-size: 1.5rem;
  }

  .icon-box {
    padding: 1.25rem;
  }
}

/* ---------- Accessibility: reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}