/*!
 * Portfolio Template - Updated for Bootstrap 5.3 and Single Page Mobile-First
 *
 * Sidebar nav focus border color (dark red): #8b0000
 */

/* ===========================================
   CSS CUSTOM PROPERTIES
   =========================================== */
:root {
  --primary-blue: #00558c;
  --secondary-blue: #0074c2;
  --text-dark: #343a40;
  --text-light: #f5f5f5;
  --sidebar-width: 17rem;
}

/* ===========================================
   BASE STYLES
   =========================================== */
html {
  scroll-behavior: smooth;
}

body {
  font-family: "Archivo", sans-serif;
  padding-top: 54px;
  color: var(--text-dark);
  position: relative;
}

@media (min-width: 992px) {
  body {
    padding-top: 0;
    padding-left: var(--sidebar-width);
  }
}

/* ===========================================
   TYPOGRAPHY
   =========================================== */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: "Roboto", sans-serif;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-dark);
}

h1 {
  font-size: clamp(2.5rem, 8vw, 5rem);
  line-height: 1.1;
}

h2 {
  font-size: clamp(2rem, 6vw, 3.5rem);
}

.subheading {
  text-transform: uppercase;
  font-weight: 500;
  font-family: "Roboto", sans-serif;
  font-size: 1.25rem;
}

p {
  font-family: "Archivo", sans-serif;
  font-size: 1.1rem;
  line-height: 1.6;
}

/* ===========================================
   UTILITY CLASSES
   =========================================== */
.bg-primary {
  background-color: var(--primary-blue) !important;
}

.text-primary {
  color: var(--primary-blue) !important;
}

.text-secondary {
  color: var(--secondary-blue) !important;
}

.text-highlight {
  background-color: var(--secondary-blue);
  color: #ffffff;
  padding: 0.1em 0.2em;
  border-radius: 2px;
}

/* ===========================================
   LINKS
   =========================================== */
a {
  color: var(--primary-blue);
  text-decoration: none;
}

a:hover,
a:focus {
  color: var(--secondary-blue);
}

/* ===========================================
   ACCESSIBILITY
   =========================================== */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: #000;
  color: #fff;
  padding: 8px 12px;
  text-decoration: none;
  z-index: 9999;
  border-radius: 0 0 4px 4px;
  font-weight: bold;
}

.skip-link:focus {
  top: 0;
  color: #fff;
}

a:focus,
button:focus {
  outline: 3px solid var(--secondary-blue);
  outline-offset: 2px;
}

/* ===========================================
   NAVIGATION
   =========================================== */
#sideNav {
  background-color: var(--primary-blue) !important;
}

#sideNav .navbar-nav .nav-item .nav-link {
  font-weight: 400;
  text-transform: uppercase;
  font-family: "Source Code Pro", sans-serif;
  color: var(--text-light);
  padding: 0.75rem 1rem;
  transition: all 0.3s ease;
  position: relative;
  min-height: 44px;
  display: flex;
  align-items: center;
}

#sideNav .navbar-nav .nav-item .nav-link:hover {
  color: #e6f3ff !important;
  background-color: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
}

#sideNav .navbar-nav .nav-item .nav-link:focus {
  color: #e6f3ff !important;
  background-color: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
  outline: none;
  border-top: 3px solid #8b0000;
  border-bottom: 3px solid #8b0000;
}

#sideNav .navbar-nav .nav-item .nav-link.active {
  background-color: rgba(255, 255, 255, 0.2);
  border-radius: 4px;
  font-weight: 600;
}

@media (min-width: 992px) {
  #sideNav {
    text-align: center;
    position: fixed;
    top: 0;
    left: 0;
    display: flex;
    flex-direction: column;
    width: var(--sidebar-width);
    height: 100vh;
    overflow-y: auto;
  }

  #sideNav .navbar-brand {
    display: flex;
    margin: auto auto 0;
    padding: 0.5rem;
  }

  #sideNav .navbar-brand .img-profile {
    max-width: 10rem;
    max-height: 10rem;
    border: 0.5rem solid rgba(255, 255, 255, 0.2);
  }

  #sideNav .navbar-collapse {
    display: flex;
    align-items: flex-start;
    flex-grow: 0;
    width: 100%;
    margin-bottom: auto;
  }

  #sideNav .navbar-collapse .navbar-nav {
    flex-direction: column;
    width: 100%;
  }

  #sideNav .navbar-collapse .navbar-nav .nav-item {
    display: block;
  }

  #sideNav .navbar-collapse .navbar-nav .nav-item .nav-link {
    display: block;
  }
}

/* ===========================================
   SECTION NAVIGATION INDICATORS
   =========================================== */
.section-nav {
  position: fixed;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 1000;
  display: none;
}

@media (min-width: 992px) {
  .section-nav {
    display: block;
  }
}

.section-nav-item {
  display: block;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(0, 85, 140, 0.3);
  margin: 8px 0;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
}

.section-nav-item.active {
  background: var(--primary-blue);
  transform: scale(1.3);
}

/* ===========================================
   PROGRESS BAR
   =========================================== */
.progress-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: rgba(255, 255, 255, 0.1);
  z-index: 9999;
}

.progress-bar-scroll {
  height: 4px;
  background: linear-gradient(
    90deg,
    var(--primary-blue),
    var(--secondary-blue)
  );
  width: 0%;
  transition: width 0.1s ease;
}

/* ===========================================
   SECTIONS
   =========================================== */
.main-section {
  min-height: 100vh;
  padding: 4rem 0;
  position: relative;
  scroll-margin-top: 2rem;
}

.section-divider {
  height: 4px;
  background: linear-gradient(
    90deg,
    var(--primary-blue),
    var(--secondary-blue),
    var(--primary-blue)
  );
  margin: 0;
  border: none;
}

/* ===========================================
   SOCIAL ICONS
   =========================================== */
.list-social-icons a {
  color: #495057;
  transition: all 0.3s ease;
  border-radius: 50%;
  display: inline-block;
}

.list-social-icons a:hover,
.list-social-icons a:focus {
  color: var(--primary-blue);
  transform: scale(1.1);
}

.list-social-icons a .fa-lg {
  font-size: 1.75rem;
}

/* ===========================================
   COURSE CARDS
   =========================================== */
.course-card {
  background: #fff;
  border: 2px solid #e9ecef;
  border-radius: 8px;
  padding: 2rem;
  margin-bottom: 2rem;
  transition: all 0.3s ease;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  opacity: 0;
  transform: translateY(20px);
}

.course-card:hover {
  border-color: var(--secondary-blue);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  transform: translateY(-2px);
}

.course-card h3 {
  margin-bottom: 1rem;
  font-size: 1.5rem;
}

/* ===========================================
   TIMELINE
   =========================================== */
.timeline-section {
  background-color: #f8f9fa;
}

.timeline {
  position: relative;
  width: 100%;
  margin: 0;
}

/* Timeline vertical bar - MUST be lower z-index */
.timeline::after {
  content: "";
  position: absolute;
  width: 6px;
  background-color: var(--primary-blue);
  top: 0;
  bottom: 0;
  left: 50%;
  margin-left: -3px;
  z-index: 1; /* Lower than circles */
}

/* Timeline containers - establish stacking context */
.timeline-container {
  padding: 10px 40px;
  position: relative;
  background-color: inherit;
  width: 50%;
  margin-bottom: 20px;
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.6s ease;
  z-index: 2; /* Establish stacking context */
}

.timeline-container.loaded {
  opacity: 1;
  transform: translateY(0);
}

/* Timeline circles - MUST be higher z-index and positioned to overlap */
.timeline-container::after {
  content: "";
  position: absolute;
  width: 25px;
  height: 25px;
  background-color: #ffffff !important;
  border: 4px solid var(--primary-blue) !important;
  top: 15px;
  border-radius: 50%;
  z-index: 999 !important; /* Much higher than timeline bar */
  display: block !important; /* Force display */
}

/* Timeline positioning */
.timeline-left {
  left: 0;
}

.timeline-right {
  left: 50%;
}

/* Left side circles - positioned to overlap timeline bar */
.timeline-left::after {
  right: -12.5px; /* Position to overlap the center line */
}

/* Right side circles - positioned to overlap timeline bar */
.timeline-right::after {
  left: -12.5px; /* Position to overlap the center line */
}

/* Timeline arrows - medium z-index */
.timeline-left::before {
  content: " ";
  height: 0;
  position: absolute;
  top: 22px;
  width: 0;
  z-index: 5; /* Between timeline and circles */
  right: 30px;
  border: medium solid var(--primary-blue);
  border-width: 10px 0 10px 10px;
  border-color: transparent transparent transparent var(--primary-blue);
}

.timeline-right::before {
  content: " ";
  height: 0;
  position: absolute;
  top: 22px;
  width: 0;
  z-index: 5; /* Between timeline and circles */
  left: 30px;
  border: medium solid var(--primary-blue);
  border-width: 10px 10px 10px 0;
  border-color: transparent var(--primary-blue) transparent transparent;
}

/* Timeline content - highest z-index */
.timeline-content {
  padding: 20px 30px;
  background-color: white;
  position: relative;
  border: 2px solid var(--primary-blue);
  border-radius: 6px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
  z-index: 10; /* Highest for content */
}

.timeline-content h2,
.timeline-content h3 {
  color: var(--primary-blue);
  margin-bottom: 15px;
  font-size: 1.8rem;
}

.timeline-content li {
  margin-bottom: 10px;
  font-family: "Archivo", sans-serif;
  font-size: 1rem;
}

.timeline-content p {
  margin-bottom: 0;
  font-family: "Archivo", sans-serif;
  font-size: 1rem;
}

/* ===========================================
   BACK TO TOP BUTTON
   =========================================== */
.back-to-top {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: var(--primary-blue);
  color: white;
  border: none;
  border-radius: 50%;
  width: 50px;
  height: 50px;
  font-size: 1.2rem;
  cursor: pointer;
  opacity: 0;
  transform: scale(0);
  transition: all 0.3s ease;
  z-index: 1000;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.back-to-top.visible {
  opacity: 1;
  transform: scale(1);
}

.back-to-top:hover,
.back-to-top:focus {
  background: var(--secondary-blue);
  transform: scale(1.1);
}

/* ===========================================
   RESPONSIVE DESIGN
   =========================================== */
@media screen and (max-width: 991px) {
  /* Timeline mobile adjustments */
  .timeline::after {
    left: 31px;
    z-index: 1; /* Keep lower than circles */
  }

  .timeline-container {
    width: 100%;
    padding-left: 70px;
    padding-right: 25px;
    z-index: 2; /* Maintain stacking context */
  }

  .timeline-container::before {
    left: 60px;
    border: medium solid var(--primary-blue);
    border-width: 10px 10px 10px 0;
    border-color: transparent var(--primary-blue) transparent transparent;
    z-index: 5;
  }

  .timeline-container::after {
    left: 15px !important;
    right: auto !important;
    z-index: 999 !important; /* Keep circles on top */
  }

  .timeline-left::after,
  .timeline-right::after {
    left: 15px !important;
    right: auto !important;
  }

  .timeline-right {
    left: 0%;
  }

  .course-card {
    padding: 1.5rem;
  }
}