/* ---------- Base Styles ---------- */
:root {
    /* Corporate Color Palette */
    --primary: #0055a4; /* Primary brand color */
    --primary-light: #3375b9; /* Lighter shade of primary */
    --primary-dark: #003b6f; /* Darker shade of primary */
    --secondary: #00396b; /* Secondary brand color */
    --accent: #e67e22; /* Accent color for CTAs */
    --success: #2e7d32; /* Success messaging */
    --danger: #c62828; /* Error messaging */
    --warning: #f57c00; /* Warning messaging */
    --info: #0288d1; /* Information messaging */
    --text-primary: #333333; /* Primary text color */
    --text-secondary: #666666; /* Secondary text color */
    --text-light: #999999; /* Light text color */
    --border-color: #e0e0e0; /* Standard border color */
    --background-light: #f8f9fa; /* Light background color */
    --background-medium: #eef1f5; /* Medium background color */
    --white: #ffffff; /* White */
    /* Typography */
    --font-primary: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-secondary: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-base: 16px;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-bold: 600;
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    /* Border Radius */
    --border-radius-sm: 0.25rem;
    --border-radius-md: 0.375rem;
    --border-radius-lg: 0.5rem;
    /* Box Shadow */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 8px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 8px 16px rgba(0, 0, 0, 0.1);
    /* Transitions */
    --transition-fast: all 0.2s ease;
    --transition-normal: all 0.3s ease;
    --transition-slow: all 0.5s ease;
}

html, body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    color: var(--text-primary);
    background-color: var(--background-light);
    line-height: 1.5;
    margin: 0;
    padding: 0;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
    margin-top: 0;
    margin-bottom: var(--spacing-md);
    font-weight: var(--font-weight-medium);
    line-height: 1.2;
    color: var(--text-primary);
}

h1 {
    font-size: 2.25rem;
}

h2 {
    font-size: 1.875rem;
}

h3 {
    font-size: 1.5rem;
}

h4 {
    font-size: 1.25rem;
}

h5 {
    font-size: 1.125rem;
}

h6 {
    font-size: 1rem;
}

h1:focus {
    outline: none;
}

p {
    margin-top: 0;
    margin-bottom: var(--spacing-md);
}

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

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

code {
    color: #0a5082;
    font-family: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    font-size: 0.875em;
    background-color: rgba(0, 85, 164, 0.05);
    padding: 0.2em 0.4em;
    border-radius: var(--border-radius-sm);
}

/* ---------- Button Styles ---------- */
.btn {
    display: inline-block;
    font-weight: var(--font-weight-medium);
    text-align: center;
    white-space: nowrap;
    vertical-align: middle;
    user-select: none;
    border: 1px solid transparent;
    padding: 0.5rem 1rem;
    font-size: 1rem;
    line-height: 1.5;
    border-radius: var(--border-radius-md);
    transition: var(--transition-normal);
    cursor: pointer;
}

    .btn:focus, .btn:active:focus {
        outline: 0;
        box-shadow: 0 0 0 0.2rem rgba(0, 85, 164, 0.25);
    }

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

    .btn-primary:hover {
        color: var(--white) !important;
        background-color: var(--primary-dark);
        border-color: var(--primary-dark);
    }

.btn-secondary {
    color: var(--white);
    background-color: var(--secondary);
    border-color: var(--secondary);
}

    .btn-secondary:hover {
        color: var(--white) !important;
        background-color: #002847;
        border-color: #00233e;
    }

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

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

.btn-link {
    font-weight: var(--font-weight-normal);
    color: var(--primary);
    background-color: transparent;
    border: none;
}

    .btn-link:hover {
        color: var(--primary-dark) !important;
        text-decoration: underline;
        background-color: transparent;
        border-color: transparent;
    }

/* ---------- Form Controls ---------- */
.form-control {
    display: block;
    width: 100%;
    padding: 0.5rem 0.75rem;
    font-size: 1rem;
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--white);
    background-clip: padding-box;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    transition: var(--transition-normal);
}

    .form-control:focus {
        color: var(--text-primary);
        background-color: var(--white);
        border-color: var(--primary-light);
        outline: 0;
        box-shadow: 0 0 0 0.2rem rgba(0, 85, 164, 0.25);
    }

.form-select {
    display: block;
    width: 100%;
    padding: 0.5rem 2.25rem 0.5rem 0.75rem;
    font-size: 1rem;
    font-weight: var(--font-weight-normal);
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--white);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 16 16'%3E%3Cpath fill='%23333' d='M4.646 6.646a.5.5 0 0 1 .708 0L8 9.293l2.646-2.647a.5.5 0 0 1 .708.708l-3 3a.5.5 0 0 1-.708 0l-3-3a.5.5 0 0 1 0-.708z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    background-size: 16px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    appearance: none;
}

    .form-select:focus {
        border-color: var(--primary-light);
        outline: 0;
        box-shadow: 0 0 0 0.2rem rgba(0, 85, 164, 0.25);
    }

    .form-select option {
        padding: 0.5rem;
        font-size: 1rem;
        background-color: var(--white);
        color: var(--text-primary);
    }

        .form-select option[data-level="0"] {
            font-weight: var(--font-weight-medium);
            color: var(--text-primary);
            background-color: var(--background-light);
        }

        .form-select option[data-level="1"] {
            color: var(--text-secondary);
            background-color: var(--white);
            padding-left: 1.25rem;
        }

        .form-select option:hover {
            background-color: var(--background-medium);
        }

        .form-select option:disabled {
            color: var(--text-light);
            background-color: var(--background-light);
        }

.form-check-input {
    width: 1rem;
    height: 1rem;
    margin-top: 0.25rem;
    vertical-align: top;
    background-color: var(--white);
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
    border: 1px solid var(--border-color);
    appearance: none;
}

    .form-check-input:checked {
        background-color: var(--primary);
        border-color: var(--primary);
    }

    .form-check-input:focus {
        border-color: var(--primary-light);
        outline: 0;
        box-shadow: 0 0 0 0.2rem rgba(0, 85, 164, 0.25);
    }

/* ---------- Validation Styles ---------- */
.invalid {
    border-color: var(--danger);
}

.validation-message {
    color: var(--danger);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

/* ---------- Header & Navigation ---------- */
.header-top {
    background: var(--white);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.875rem;
    position: sticky;
    top: 0;
    transition: var(--transition-normal);
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.hide-header-top {
    transform: translateY(-100%);
}

.nav-item .nav-link {
    color: var(--text-primary);
    text-decoration: none;
    padding: 0.5rem 1rem;
    transition: var(--transition-normal);
}

    .nav-item .nav-link:hover {
        color: var(--primary);
    }

    .nav-item .nav-link.active {
        color: var(--primary);
        font-weight: var(--font-weight-medium);
        border-bottom: 2px solid var(--primary);
    }

/* ---------- Cards & Content ---------- */
.content {
    padding-top: var(--spacing-lg);
}

.course-cards {
    background-color: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    text-align: center;
    padding: var(--spacing-md);
    transition: var(--transition-normal);
    position: relative;
    height: 100%;
}

    .course-cards:hover {
        box-shadow: var(--shadow-lg);
        transform: translateY(-2px);
    }

.course-image {
    width: 100%;
    height: auto;
    object-fit: contain;
    margin-bottom: var(--spacing-sm);
    border-radius: var(--border-radius-sm);
}

.course-title {
    font-size: 1.1rem;
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
    height: 3rem;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

.course-level {
    display: inline-block;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    padding: 0.25rem 0.75rem;
    background-color: var(--background-light);
    border-radius: var(--border-radius-sm);
}

.course-pricing {
    display: flex;
    justify-content: center;
    align-items: baseline;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.course-price {
    font-size: 1.25rem;
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
}

.course-discount-price {
    font-size: 0.875rem;
    color: var(--danger);
    text-decoration: line-through;
}

.course-duration {
    font-size: 0.875rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
}

.instructor-container {
    display: flex;
    align-items: center;
    justify-content: center;
    margin: var(--spacing-sm) 0;
}

.instructor-image {
    width: 2rem;
    height: 2rem;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--background-light);
}

/* ---------- Wishlist Button ---------- */
.wishlist-btn {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: none;
    border: none;
    font-size: 1.125rem;
    color: var(--text-light);
    cursor: pointer;
    transition: var(--transition-fast);
}

    .wishlist-btn:hover {
        color: var(--danger);
    }

/* ---------- Search & Filters ---------- */
.search-filter {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-md);
    background-color: var(--white);
    box-shadow: var(--shadow-sm);
}

.filter-widget h4 {
    font-size: 1.125rem;
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.custom-radio {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-sm);
    cursor: pointer;
}

    .custom-radio input[type="radio"] {
        display: none;
    }

.radio-mark {
    height: 1rem;
    width: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    margin-right: var(--spacing-sm);
    position: relative;
    transition: var(--transition-fast);
}

.custom-radio input[type="radio"]:checked + .radio-mark {
    border-color: var(--primary);
}

    .custom-radio input[type="radio"]:checked + .radio-mark::after {
        content: "";
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        height: 0.5rem;
        width: 0.5rem;
        background-color: var(--primary);
        border-radius: 50%;
    }

.category-list {
    padding-left: var(--spacing-lg);
    list-style-type: none;
}

.subcategory-list {
    padding-left: var(--spacing-xl);
    font-size: 0.875rem;
    color: var(--text-secondary);
    list-style-type: none;
}

.subcategory {
    margin-left: var(--spacing-xl);
}

.filter-widget i {
    margin-left: auto;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition-fast);
}

    .filter-widget i:hover {
        color: var(--primary);
    }

/* ---------- Login & Authentication ---------- */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--background-light);
}

.login-card {
    border: none;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    background-color: var(--white);
    max-width: 1000px;
    width: 100%;
}

.login-image {
    background-size: cover;
    background-position: center;
    min-height: 400px;
}

.login-form {
    padding: var(--spacing-xl);
}

.toggle-buttons button {
    border-radius: 0;
    padding: var(--spacing-sm) var(--spacing-md);
    font-weight: var(--font-weight-medium);
}

.role-buttons .btn {
    border: 1px solid var(--primary);
    color: var(--primary);
    margin: 0.2rem;
    transition: var(--transition-fast);
}

    .role-buttons .btn:hover {
        background-color: var(--primary);
        color: var(--white) !important;
    }

/* ---------- Shopping Cart ---------- */
.cart-totals {
    margin: 0.25rem var(--spacing-lg);
    float: right;
    color: var(--text-primary);
}

    .cart-totals h5 {
        font-size: 1rem;
        font-weight: var(--font-weight-bold);
        color: var(--text-primary);
    }

.cart-content {
    height: 350px;
    width: 390px;
    overflow-y: auto;
    position: relative;
    padding-right: 0;
    background-color: var(--white);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-lg);
}

    .cart-content ul {
        list-style: none;
        padding: 0;
        margin: 0 0 var(--spacing-lg);
    }

        .cart-content ul li {
            padding: var(--spacing-md) 0;
            border-bottom: 1px solid var(--border-color);
        }

            .cart-content ul li .media {
                display: flex;
                justify-content: space-between;
                align-items: center;
                padding: 0 var(--spacing-md);
            }

    .cart-content .media-body {
        overflow: hidden;
        flex: 1;
    }

    .cart-content h6 {
        text-overflow: ellipsis;
        white-space: nowrap;
        overflow: hidden;
        margin-bottom: 0.125rem;
    }

    .cart-content .media .avatar img {
        width: 84px;
        height: 63px;
        border-radius: var(--border-radius-sm);
        margin-right: var(--spacing-sm);
        object-fit: cover;
    }

    .cart-content h6 a {
        color: var(--text-primary);
        font-size: 0.875rem;
        font-weight: var(--font-weight-medium);
        transition: var(--transition-fast);
    }

        .cart-content h6 a:hover {
            color: var(--primary);
            text-decoration: none;
        }

    .cart-content h5 {
        color: var(--primary);
        font-size: 0.9375rem;
        font-weight: var(--font-weight-bold);
        margin-bottom: 0;
        float: right;
    }

    .cart-content p {
        color: var(--text-secondary);
        font-size: 0.75rem;
        margin-bottom: 0.125rem;
    }

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

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

/* ---------- Loading Overlay ---------- */
#loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    color: var(--white);
}

.spinner {
    width: 60px;
    height: 60px;
    position: relative;
}

.double-bounce1,
.double-bounce2 {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background-color: var(--primary);
    opacity: 0.6;
    position: absolute;
    top: 0;
    left: 0;
    animation: bounce 2.0s infinite ease-in-out;
}

.double-bounce2 {
    animation-delay: -1.0s;
}

.loading-progress-text {
    margin-top: var(--spacing-lg);
    color: var(--white);
    font-size: 1.125rem;
    font-weight: var(--font-weight-medium);
    text-align: center;
    letter-spacing: 0.03125rem;
    animation: fade-in 1.5s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% {
        transform: scale(0.0);
    }

    50% {
        transform: scale(1.0);
    }
}

@keyframes fade-in {
    0%, 100% {
        opacity: 1;
    }

    50% {
        opacity: 0.6;
    }
}

/* ---------- Error Handling ---------- */
#blazor-error-ui {
    background: #fff7cc;
    border-top: 1px solid #f0e0a2;
    bottom: 0;
    box-shadow: 0 -1px 4px rgba(0, 0, 0, 0.1);
    display: none;
    left: 0;
    padding: 0.75rem 1.25rem;
    position: fixed;
    width: 100%;
    z-index: 1000;
    color: #856404;
}

    #blazor-error-ui .dismiss {
        cursor: pointer;
        position: absolute;
        right: 0.75rem;
        top: 0.5rem;
        font-size: 1.25rem;
        color: #856404;
    }

.blazor-error-boundary {
    background: linear-gradient(to right, rgba(179, 33, 33, 0.95), rgba(179, 33, 33, 0.8));
    padding: 1.25rem 1.25rem 1.25rem 3.75rem;
    color: var(--white);
    position: relative;
    border-radius: var(--border-radius-sm);
    margin: var(--spacing-md) 0;
}

    .blazor-error-boundary::before {
        content: "⚠️";
        font-size: 1.5rem;
        position: absolute;
        left: 1.25rem;
        top: 1rem;
    }

    .blazor-error-boundary::after {
        content: "An error has occurred.";
        font-weight: var(--font-weight-medium);
    }

/* ---------- Responsive Styles ---------- */
@media (max-width: 992px) {
    :root {
        --font-size-base: 15px;
    }

    .course-cards {
        padding: var(--spacing-sm);
    }

    .course-title {
        font-size: 1rem;
    }
}

@media (max-width: 768px) {
    .top-nav {
        display: none !important;
    }

    .mobile-back {
        background-color: var(--background-medium);
        padding: 0.5rem;
        color: var(--text-primary);
        border-radius: var(--border-radius-sm);
    }

    .login-card {
        margin: 0 var(--spacing-md);
    }

    .login-image {
        min-height: 200px;
    }

    .cart-content {
        width: 100%;
        max-width: 350px;
    }
}

@media (max-width: 576px) {
    :root {
        --font-size-base: 14px;
    }

    .header-top {
        padding: 0.5rem 1rem;
    }

    .login-form {
        padding: var(--spacing-lg);
    }

    h1 {
        font-size: 1.75rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    .cart-totals {
        margin: 0.25rem var(--spacing-md);
    }
}