/* ===============================================
   LMS Global UI Enhancement Stylesheet
   Modern polish layered on existing design.
   Palette: #667eea -> #764ba2 -> #f093fb
   NOTE: Purely visual. No layout/structure changes
   that would affect functionality.
   =============================================== */

:root {
    --lms-primary: #667eea;
    --lms-secondary: #764ba2;
    --lms-accent: #f093fb;
    --lms-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    --lms-gradient-soft: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --lms-shadow-sm: 0 4px 12px rgba(102, 126, 234, 0.12);
    --lms-shadow-md: 0 10px 30px rgba(102, 126, 234, 0.18);
    --lms-shadow-lg: 0 20px 50px rgba(102, 126, 234, 0.25);
    --lms-radius: 16px;
}

/* === Smooth scrolling & font smoothing === */
html {
    scroll-behavior: smooth;
}

body {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* === Enhanced Navbar Brand Logo === */
.navbar-brand {
    transition: transform 0.3s ease, filter 0.3s ease;
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none !important;
}

.navbar-brand .logo-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    border-radius: 12px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    font-size: 20px;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.4s ease;
    flex-shrink: 0;
}

.navbar-brand:hover .logo-badge {
    transform: rotate(-8deg) scale(1.1);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.55);
}

.navbar-brand .logo-text {
    font-size: 28px;
    font-weight: 800;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    background-size: 200% 200%;
    animation: logoGradientShift 4s ease infinite;
    letter-spacing: -0.5px;
    line-height: 1;
}

@keyframes logoGradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.navbar-brand:hover {
    transform: translateY(-2px) scale(1.02);
    filter: drop-shadow(0 4px 10px rgba(102, 126, 234, 0.35));
}

/* === Animated Nav Link Underline === */
.navbar-nav .nav-link {
    position: relative;
    transition: color 0.3s ease;
}

.navbar-nav .nav-link::after {
    content: '';
    position: absolute;
    left: 12px;
    right: 12px;
    bottom: 4px;
    height: 2px;
    background: var(--lms-gradient);
    border-radius: 2px;
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease;
}

.navbar-nav .nav-link:hover::after,
.navbar-nav .nav-link.active::after {
    transform: scaleX(1);
}

/* === Card Enhancements === */
.card,
.card-custom,
.course-card,
.category-card,
.contact-card,
.image-card,
.stat-card {
    border: none;
    border-radius: var(--lms-radius);
    box-shadow: var(--lms-shadow-sm);
    transition: transform 0.35s cubic-bezier(0.175, 0.885, 0.32, 1.275),
                box-shadow 0.35s ease;
    overflow: hidden;
}

.card:hover,
.card-custom:hover,
.course-card:hover,
.category-card:hover,
.contact-card:hover,
.image-card:hover,
.stat-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--lms-shadow-lg);
}

/* Subtle top accent bar on cards */
.course-card,
.category-card {
    position: relative;
}

.course-card::before,
.category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--lms-gradient);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
    z-index: 5;
}

.course-card:hover::before,
.category-card:hover::before {
    transform: scaleX(1);
}

/* === Button Enhancements === */
.btn {
    border-radius: 10px;
    font-weight: 600;
    letter-spacing: 0.2px;
    transition: transform 0.25s ease, box-shadow 0.25s ease, filter 0.25s ease;
}

.btn-primary,
.btn-submit,
.btn-login {
    background: var(--lms-gradient-soft);
    border: none;
}

.btn-primary:hover,
.btn-submit:hover,
.btn-login:hover {
    background: var(--lms-gradient-soft);
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(102, 126, 234, 0.4);
    filter: brightness(1.05);
}

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

.btn-outline-primary:hover {
    background: var(--lms-gradient-soft);
    border-color: transparent;
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(102, 126, 234, 0.35);
}

/* Shine effect on primary buttons */
.btn-primary,
.btn-submit,
.btn-login {
    position: relative;
    overflow: hidden;
}

.btn-primary::after,
.btn-submit::after,
.btn-login::after {
    content: '';
    position: absolute;
    top: 0;
    left: -120%;
    width: 60%;
    height: 100%;
    background: linear-gradient(120deg, transparent, rgba(255, 255, 255, 0.35), transparent);
    transition: left 0.6s ease;
}

.btn-primary:hover::after,
.btn-submit:hover::after,
.btn-login:hover::after {
    left: 130%;
}

/* === Badge Enhancements === */
.badge {
    font-weight: 600;
    letter-spacing: 0.3px;
    border-radius: 8px;
}

/* === Form Control Focus === */
.form-control:focus,
.form-select:focus {
    border-color: var(--lms-primary);
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.2);
}

/* === Carousel Enhancements === */
.carousel-item img {
    border-radius: var(--lms-radius);
}

.carousel-control-prev-icon,
.carousel-control-next-icon {
    background-color: rgba(102, 126, 234, 0.85);
    border-radius: 50%;
    padding: 18px;
    background-size: 50%;
}

.carousel-indicators [data-bs-target] {
    border-radius: 50%;
    width: 10px;
    height: 10px;
}

.carousel-caption {
    background: rgba(26, 26, 46, 0.45);
    backdrop-filter: blur(6px);
    border-radius: 12px;
}

/* === Footer Enhancements === */
footer {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    color: #fff;
    position: relative;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--lms-gradient);
}

footer a,
footer .footer-link {
    transition: color 0.3s ease, transform 0.3s ease;
}

footer .footer-link:hover {
    color: var(--lms-accent) !important;
}

/* Footer social icons */
footer .social-icon {
    transition: transform 0.3s ease, background 0.3s ease, box-shadow 0.3s ease;
}

footer .social-icon:hover {
    background: var(--lms-gradient) !important;
    transform: translateY(-4px) scale(1.1);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.45);
}

/* === Sidebar (dashboards) polish === */
.sidebar {
    background: linear-gradient(180deg, #1a1a2e 0%, #16213e 100%);
}

.sidebar .nav-link {
    border-radius: 10px;
    margin-bottom: 4px;
    transition: background 0.3s ease, transform 0.25s ease, padding-left 0.25s ease;
}

.sidebar .nav-link:hover {
    background: rgba(102, 126, 234, 0.18);
    transform: translateX(4px);
}

.sidebar .nav-link.active {
    background: var(--lms-gradient-soft);
    box-shadow: 0 6px 16px rgba(102, 126, 234, 0.4);
}

/* === Table polish === */
.table thead th {
    border-top: none;
    font-weight: 700;
    color: var(--lms-primary);
}

.table tbody tr {
    transition: background 0.2s ease;
}

.table tbody tr:hover {
    background: rgba(102, 126, 234, 0.06);
}

/* === Alerts polish === */
.alert {
    border: none;
    border-radius: 12px;
    border-left: 4px solid transparent;
}

.alert-success { border-left-color: #43e97b; }
.alert-danger  { border-left-color: #f5576c; }
.alert-warning { border-left-color: #facc15; }
.alert-info    { border-left-color: var(--lms-primary); }

/* === Modal polish === */
.modal-content {
    border: none;
    border-radius: var(--lms-radius);
    box-shadow: var(--lms-shadow-lg);
    overflow: hidden;
}

.modal-header {
    background: var(--lms-gradient-soft);
    color: #fff;
}

.modal-header .btn-close {
    filter: brightness(0) invert(1);
}

/* === Section heading accent === */
.section-title,
h2.fw-bold {
    position: relative;
}

/* === Fade-in on load for main content === */
@keyframes lmsFadeUp {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0); }
}

.card,
.card-custom,
.course-card,
.category-card,
.stat-card {
    animation: lmsFadeUp 0.5s ease both;
}

/* === Scrollbar styling === */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: rgba(102, 126, 234, 0.08);
}

::-webkit-scrollbar-thumb {
    background: var(--lms-gradient-soft);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--lms-secondary);
}

/* === Link color consistency === */
a {
    transition: color 0.25s ease;
}

/* === Image hover zoom inside cards === */
.course-card img,
.category-card img,
.image-card img {
    transition: transform 0.5s ease;
}

.course-card:hover img,
.category-card:hover img,
.image-card:hover img {
    transform: scale(1.06);
}