/* ============================================================
   Theme Variables – Light Mode
   ============================================================ */
:root {
  --bg-primary:   #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-card:      #ffffff;
  --text-primary:   #212529;
  --text-secondary: #6c757d;
  --text-muted:     #666666;
  --border-color:   #dee2e6;
  --nav-link-color:       rgba(0, 0, 0, 0.8);
  --nav-link-hover-color: rgba(0, 0, 0, 0.6);
  --card-hover-bg:   #1a1a1a;
  --card-hover-text: #ffffff;
  --shadow-color: rgba(0, 0, 0, 0.1);
  --course-border: #ccc;
}

/* ============================================================
   Theme Variables – Dark Mode
   ============================================================ */
[data-theme="dark"] {
  --bg-primary:   #121212;
  --bg-secondary: #1e1e1e;
  --bg-card:      #252525;
  --text-primary:   #e0e0e0;
  --text-secondary: #a0a0a0;
  --text-muted:     #999999;
  --border-color:   #383838;
  --nav-link-color:       rgba(255, 255, 255, 0.85);
  --nav-link-hover-color: rgba(255, 255, 255, 0.6);
  --card-hover-bg:   #3a3a3a;
  --card-hover-text: #ffffff;
  --shadow-color: rgba(0, 0, 0, 0.5);
  --course-border: #383838;
  color-scheme: dark;
}

/* ============================================================
   Base
   ============================================================ */
html, body {
  overflow-x: hidden;
}

html {
  scroll-behavior: smooth;
}

@media screen and (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  transition: background-color 0.3s ease, color 0.3s ease;
}

.section {
  scroll-margin-top: 2rem;
}

/* ============================================================
   Dark Mode – Global Bootstrap Overrides
   ============================================================ */
[data-theme="dark"] .bg-light {
  background-color: var(--bg-secondary) !important;
}

[data-theme="dark"] .navbar {
  background-color: var(--bg-secondary) !important;
}

[data-theme="dark"] .text-secondary {
  color: var(--text-secondary) !important;
}

[data-theme="dark"] footer {
  background-color: var(--bg-secondary) !important;
  color: var(--text-primary);
}

[data-theme="dark"] .card {
  background-color: var(--bg-card);
  border-color: var(--border-color);
  color: var(--text-primary);
}

[data-theme="dark"] .card-title {
  color: var(--text-primary);
}

[data-theme="dark"] .card-text {
  color: var(--text-secondary);
}

[data-theme="dark"] .btn-outline-secondary {
  color: var(--text-secondary);
  border-color: var(--border-color);
}

[data-theme="dark"] .btn-outline-secondary:hover,
[data-theme="dark"] .btn-outline-secondary.active {
  background-color: var(--bg-card);
  color: var(--text-primary);
  border-color: var(--border-color);
}

[data-theme="dark"] .btn-secondary {
  background-color: #3a3a3a;
  border-color: #555;
  color: #e0e0e0;
}

[data-theme="dark"] .btn-secondary:hover {
  background-color: #484848;
  border-color: #666;
}

[data-theme="dark"] .shadow-sm {
  box-shadow: 0 0.125rem 0.25rem var(--shadow-color) !important;
}

[data-theme="dark"] .navbar-toggler {
  border-color: rgba(255, 255, 255, 0.3);
}

[data-theme="dark"] .navbar-toggler-icon {
  filter: invert(1);
}

/* ============================================================
   Dark Mode Toggle Button
   ============================================================ */
#theme-toggle {
  border: 1px solid rgba(0, 0, 0, 0.2);
  border-radius: 50%;
  width: 32px;
  height: 32px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  background: transparent;
  color: var(--text-primary);
  cursor: pointer;
  flex-shrink: 0;
  transition: background-color 0.2s, border-color 0.2s, color 0.2s;
}

#theme-toggle:hover {
  background-color: var(--bg-card);
}

[data-theme="dark"] #theme-toggle {
  border-color: rgba(255, 255, 255, 0.25);
  color: #e0e0e0;
}

/* ============================================================
   Header & Navbar
   ============================================================ */
.site-title {
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 3rem;
  text-decoration: none;
}

@media (min-width: 48em) {
  .site-title {
    float: left;
  }
}

.nav-link {
  font-weight: 700;
  color: var(--nav-link-color) !important;
  transition: color 0.2s;
}

.social-nav .nav-link {
  padding: 0 0.5rem;
  font-size: 1.1rem;
  line-height: 2.5rem;
}

.nav-link:hover,
.nav-link:focus,
.active .nav-link {
  color: var(--nav-link-hover-color) !important;
}

/* ============================================================
   Hero Section
   ============================================================ */
.intro-title {
  font-weight: 800;
}

@keyframes animateWave {
  0%   { transform: scale(1, 0); }
  100% { transform: scale(1, 1); }
}

.wave-bg {
  display: block;
  height: 220px;
  width: 100%;
  min-width: 600px;
  transform-origin: top;
  animation: animateWave 2000ms cubic-bezier(0.23, 1, 0.32, 1) forwards;
  background-image: url("../images/wave-bg.svg");
  background-position: center;
  background-repeat: no-repeat;
}

[data-theme="dark"] .wave-bg {
  opacity: 0.15;
}

img.avatar {
  border-radius: 30px;
}

/* ============================================================
   Skills Cards
   ============================================================ */
.card-text {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  transition: all 0.3s ease;
}

.card:hover .card-text {
  white-space: normal;
  overflow: visible;
  background-color: var(--card-hover-bg);
  color: var(--card-hover-text);
  padding: 5px;
  border-radius: 5px;
}

/* ============================================================
   Courses & Certifications
   ============================================================ */
.course-list {
  list-style: none;
  padding: 0;
}

.course-item {
  border: 1px solid var(--course-border);
  border-radius: 5px;
  padding: 15px;
  margin-bottom: 15px;
  box-shadow: 0 2px 4px var(--shadow-color);
  background-color: var(--bg-card);
  transition: background-color 0.3s, border-color 0.3s;
}

.course-item h3 {
  font-size: 18px;
  margin-bottom: 5px;
  color: var(--text-primary);
}

.course-item p {
  font-size: 14px;
  color: var(--text-muted);
  margin: 0;
}

/* ============================================================
   Masonry Portfolio Grid
   ============================================================ */
.grid:after {
  content: '';
  display: block;
  clear: both;
}

.grid-sizer,
.grid-item {
  width: 100%;
}

.grid-item {
  padding-bottom: 12px;
}

@media (min-width: 48em) {
  .grid-sizer,
  .grid-item {
    width: 25%;
  }
  .grid-item {
    float: left;
    padding: 6px;
  }
}

.grid-item img {
  display: block;
  width: 100%;
  max-width: 100%;
}

/* ============================================================
   Portfolio Items
   ============================================================ */
.portfolio-section .container {
  padding: 0;
}

.portfolio-item {
  position: relative;
  overflow: hidden;
  text-align: center;
  margin: 0;
}

.portfolio-item figcaption {
  position: absolute;
  top: auto;
  bottom: 0;
  left: 0;
  width: 100%;
  padding: 12px;
  background: rgba(255, 255, 255, 0.75);
  transition: transform 0.35s;
  transform: translate3d(0, 100%, 0);
}

.portfolio-item figcaption h4 {
  color: #222;
  font-size: 16px;
  text-transform: uppercase;
  font-weight: 700;
  margin-bottom: 3px;
}

.portfolio-item figcaption p {
  color: #444;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 0;
}

.portfolio-item:hover figcaption {
  transform: translate3d(0, 0, 0);
}

#bp_container .bp-xc {
  background: #F6E05E !important;
}

#bp_caption a {
  text-decoration: none;
}

/* ============================================================
   Footer
   ============================================================ */
footer a:not(.nav-link) {
  color: inherit;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
}

/* ============================================================
   Scroll To Top
   ============================================================ */
#scrolltop {
  display: block;
  visibility: hidden;
  opacity: 0;
  transition: visibility 0s, opacity 0.5s ease-in;
  position: fixed;
  bottom: 20px;
  right: 20px;
}

#scrolltop .btn {
  padding: 3px 11px;
  border-radius: 50%;
}

/* ============================================================
   Utilities
   ============================================================ */
.container-narrow {
  max-width: 1024px;
  margin: 0 auto;
}

.text-small {
  font-size: 0.875rem;
}

.text-uppercase {
  letter-spacing: 0.05em;
}

.hover-effect {
  transition: transform 0.18s ease-in-out;
}

.hover-effect:hover {
  transform: translateY(-2px);
}

.marker {
  position: relative;
  display: inline;
  width: auto;
}

.marker-center {
  padding-right: 0;
}

.marker:after {
  content: "";
  width: 125px;
  height: 30px;
  position: absolute;
  bottom: -25px;
  right: -30px;
  background-image: url("../images/marker.svg");
  background-repeat: no-repeat;
}

.marker-center:after {
  bottom: -30px;
  left: 50%;
  margin-left: -60px;
}

@media (max-width: 575.98px) {
  .marker {
    padding-right: 0;
  }
  .marker:after {
    bottom: -30px;
    left: 50%;
    margin-left: -60px;
  }
}

.entry-title a {
  text-decoration: none;
}

/* ============================================================
   Lab Dropdown
   ============================================================ */

/* Remove caret */
.lab-nav-link::after {
  display: none;
}

/* Align left edge of dropdown with left edge of trigger ("Laboratory") */
.lab-dd-menu {
  left: 0;
  right: auto;
  transform: none;
  margin-top: 0.4rem;
  min-width: 160px;
  border-radius: 6px;
  padding: 0.4rem 0;
  box-shadow: 0 4px 16px rgba(0,0,0,0.12);
}

.lab-dd-menu .dropdown-item {
  padding: 0.45rem 1.2rem;
  font-size: 0.875rem;
}

/* ============================================================
   Dropdown – Dark Mode Support
   ============================================================ */
[data-theme="dark"] .dropdown-menu {
  background-color: var(--bg-secondary);
  border-color: var(--border-color);
}

[data-theme="dark"] .dropdown-item {
  color: var(--text-primary);
}

[data-theme="dark"] .dropdown-item:hover,
[data-theme="dark"] .dropdown-item:focus {
  background-color: var(--bg-card);
  color: var(--text-primary);
}

[data-theme="dark"] .dropdown-divider {
  border-color: var(--border-color);
}