:root {
  --bg: #0b1220;
  --text: #ffffff;
  --primary: #7c3aed;
  --accent: #06b6d4;

  --glass-bg: rgba(255, 255, 255, 0.08);
  --glass-border: rgba(255, 255, 255, 0.18);
}

body {
  font-family: "Poppins", sans-serif;
  background: var(--bg);
  color: var(--text);
}

/* Light mode */
body.light-mode {
  --bg: #f8fafc;
  --text: #0f172a;
  --primary: #2563eb;
  --accent: #22c55e;

  --glass-bg: rgba(255, 255, 255, 0.55);
  --glass-border: rgba(0, 0, 0, 0.10);
}

/* Background Glow */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background: radial-gradient(circle at top left, rgba(124, 58, 237, 0.25), transparent 50%),
              radial-gradient(circle at bottom right, rgba(6, 182, 212, 0.20), transparent 50%);
  z-index: -1;
}

body.light-mode::before {
  background: radial-gradient(circle at top left, rgba(37, 99, 235, 0.20), transparent 50%),
              radial-gradient(circle at bottom right, rgba(34, 197, 94, 0.18), transparent 50%);
}

/* Navbar */
.glass-navbar {
  background: var(--glass-bg);
  border-bottom: 1px solid var(--glass-border);
  backdrop-filter: blur(14px);
}

.navbar-brand .brand-text {
  font-weight: 900;
  font-size: 1.3rem;
}

.navbar-brand .brand-id {
  font-weight: 900;
  font-size: 1.3rem;
  color: var(--primary);
}

.nav-link {
  font-weight: 700;
  opacity: 0.75;
  color: var(--text) !important;
}

.nav-link.active {
  opacity: 1;
  color: var(--primary) !important;
}

/* Buttons */
.btn-glass {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text);
  border-radius: 14px;
  padding: 10px 14px;
  font-weight: 700;
}

.btn-outline-custom {
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  color: var(--text);
  padding: 12px 18px;
  border-radius: 14px;
  font-weight: 700;
  transition: 0.2s;
}

.btn-outline-custom:hover {
  border-color: var(--primary);
  color: var(--primary);
}

/* Header */
.page-header {
  padding: 70px 0 40px;
}

.page-title {
  font-size: 2.6rem;
  font-weight: 900;
}

.page-subtitle {
  opacity: 0.8;
  max-width: 720px;
  margin: 0 auto;
}

/* Filter */
.filter-glass {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 18px;
  backdrop-filter: blur(14px);
}

.search-box {
  position: relative;
}

.search-box i {
  position: absolute;
  top: 50%;
  left: 14px;
  transform: translateY(-50%);
  opacity: 0.7;
}

.search-box input {
  padding-left: 40px;
  border-radius: 14px;
  background: rgba(0, 0, 0, 0.15);
  border: 1px solid var(--glass-border);
  color: var(--text);
}

body.light-mode .search-box input {
  background: rgba(255, 255, 255, 0.6);
}

.form-select {
  border-radius: 14px;
  border: 1px solid var(--glass-border);
  background: rgba(0, 0, 0, 0.15);
  color: var(--text);
}

body.light-mode .form-select {
  background: rgba(255, 255, 255, 0.6);
}

/* Courses */
.courses-section {
  padding: 50px 0 90px;
}

.course-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 18px;
  padding: 25px;
  height: 100%;
  transition: 0.25s ease;
  backdrop-filter: blur(14px);
}

.course-card:hover {
  transform: translateY(-8px);
  border-color: var(--primary);
  box-shadow: 0 0 25px rgba(124, 58, 237, 0.35);
}

body.light-mode .course-card:hover {
  box-shadow: 0 0 25px rgba(37, 99, 235, 0.20);
}

.course-card h4 {
  font-weight: 900;
  margin-bottom: 10px;
}

.course-card p {
  opacity: 0.85;
  font-size: 0.95rem;
}

.course-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 18px;
}

.level-badge {
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 800;
  border: 1px solid var(--glass-border);
}

.level-beginner {
  color: #22c55e;
  background: rgba(34, 197, 94, 0.15);
}

.level-intermediate {
  color: #3b82f6;
  background: rgba(59, 130, 246, 0.15);
}

.level-advanced {
  color: #f97316;
  background: rgba(249, 115, 22, 0.15);
}

.course-link {
  font-weight: 800;
  text-decoration: none;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: 0.2s;
}

.course-link:hover {
  gap: 14px;
  color: var(--accent);
}

.search-box input {
  padding: 12px 14px 12px 42px !important;
  border-radius: 16px !important;
  background: var(--glass-bg) !important;
  border: 1px solid var(--glass-border) !important;
  color: var(--text) !important;
  font-weight: 600;
}

.form-select {
  padding: 12px 14px !important;
  border-radius: 16px !important;
  background: var(--glass-bg) !important;
  border: 1px solid var(--glass-border) !important;
  color: var(--text) !important;
  font-weight: 700;
}

/* Footer */
.footer-section {
  padding: 30px 0;
  border-top: 1px solid var(--glass-border);
  background: rgba(255, 255, 255, 0.03);
}

.dev-link {
  font-weight: 900;
  color: var(--primary);
  text-decoration: none;
}

.dev-link:hover {
  color: var(--accent);
}

/* =========================
   Custom Select Glass
========================= */
.form-select {
  padding: 12px 14px !important;
  border-radius: 16px !important;
  background: var(--glass-bg) !important;
  border: 1px solid var(--glass-border) !important;
  color: var(--text) !important;
  font-weight: 700;
  cursor: pointer;
  backdrop-filter: blur(14px);
  transition: 0.2s ease;
}

.form-select:focus {
  border-color: var(--primary) !important;
  box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.25) !important;
}

/* Dropdown options (important fix) */
.form-select option {
  background: #0b1220;
  color: white;
  font-weight: 600;
}

/* Light mode options */
body.light-mode .form-select option {
  background: #f8fafc;
  color: #0f172a;
}

.form-select {
  background-image: none !important;
}

.select-wrapper {
  position: relative;
}

.select-wrapper::after {
  content: "\F282"; /* bootstrap icon caret-down-fill */
  font-family: "bootstrap-icons";
  position: absolute;
  top: 50%;
  right: 14px;
  transform: translateY(-50%);
  pointer-events: none;
  opacity: 0.8;
}

.form-select {
  background-image: none !important;
}

.select-wrapper {
  position: relative;
}

.select-wrapper::after {
  content: "\F282"; /* bootstrap icon caret-down-fill */
  font-family: "bootstrap-icons";
  position: absolute;
  top: 50%;
  right: 14px;
  transform: translateY(-50%);
  pointer-events: none;
  opacity: 0.8;
}

/* =========================
   Projects Section
========================= */
.projects-section {
  padding: 90px 0;
}

.project-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 18px;
  padding: 28px;
  backdrop-filter: blur(14px);
  transition: 0.25s ease;
  height: 100%;
  position: relative;
  overflow: hidden;
}

.project-card:hover {
  transform: translateY(-8px);
  border-color: var(--primary);
  box-shadow: 0 0 25px rgba(37, 99, 235, 0.18);
}

body.dark-mode .project-card:hover {
  box-shadow: 0 0 30px rgba(124, 58, 237, 0.35),
              0 0 40px rgba(6, 182, 212, 0.18);
}

/* Header */
.project-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 18px;
}

.project-icon {
  font-size: 1.2rem;
  opacity: 0.8;
}

/* Badge */
.project-badge {
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 700;
  border: 1px solid var(--glass-border);
}

.badge-beginner {
  background: rgba(34, 197, 94, 0.15);
  color: #22c55e;
}

.badge-intermediate {
  background: rgba(59, 130, 246, 0.15);
  color: #3b82f6;
}

.badge-advanced {
  background: rgba(249, 115, 22, 0.15);
  color: #f97316;
}

/* Title & text */
.project-card h4 {
  font-weight: 800;
  margin-bottom: 10px;
}

.project-card p {
  opacity: 0.85;
  font-size: 0.95rem;
  margin-bottom: 16px;
}

/* Tags */
.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.project-tags span {
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  border: 1px solid var(--glass-border);
  background: rgba(255, 255, 255, 0.08);
}

/* Link */
.project-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  text-decoration: none;
  color: var(--primary);
  transition: 0.2s;
}

.project-link:hover {
  gap: 14px;
  color: var(--accent);
}