:root {
    --primary-color: #0d6efd;
    --secondary-color: #6c757d;
    --success-color: #198754;
    --danger-color: #dc3545;
    --dark-color: #212529;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f8f9fa;
    margin: 0;
    padding: 0;
}

main {
    min-height: calc(100vh - 60px);
}

main.login-page {
    min-height: 100vh;
    margin: 0;
    padding: 0;
}

/* Login Page Styles */
.login-page {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 0;
    margin: 0;
}

.login-page .container-fluid {
    padding: 0;
    margin: 0;
}

.login-page .row {
    margin: 0;
}

.login-page .card {
    border: none;
    border-radius: 15px;
    backdrop-filter: blur(10px);
}

.login-page .nav-pills .nav-link {
    border-radius: 10px;
    font-weight: 500;
}

.login-page .nav-pills .nav-link.active {
    background-color: var(--primary-color);
}

/* Card Hover Effects */
.hover-card {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.hover-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15) !important;
}

/* Score Icon */
.score-icon {
    opacity: 0.8;
}

/* Navbar Styles */
.modern-navbar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.modern-navbar .navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    color: white !important;
    transition: transform 0.3s ease;
}

.modern-navbar .navbar-brand:hover {
    transform: scale(1.05);
}

.brand-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 10px;
    font-size: 1.3rem;
}

.brand-text {
    font-size: 1.4rem;
    letter-spacing: 0.5px;
}

.modern-navbar .nav-link {
    color: rgba(255, 255, 255, 0.9) !important;
    font-weight: 500;
    font-size: 1rem;
    padding: 0.5rem 1rem !important;
    border-radius: 8px;
    transition: all 0.3s ease;
    position: relative;
}

.modern-navbar .nav-link:hover {
    background: rgba(255, 255, 255, 0.15);
    color: white !important;
    transform: translateY(-2px);
}

.modern-navbar .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: white;
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.modern-navbar .nav-link:hover::after {
    width: 80%;
}

.navbar-toggler {
    padding: 0.5rem 0.75rem;
    border: 2px solid rgba(255, 255, 255, 0.3) !important;
    border-radius: 8px;
}

.navbar-toggler:focus {
    box-shadow: 0 0 0 0.25rem rgba(255, 255, 255, 0.25);
}

.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255, 255, 255, 1%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

.language-selector {
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: white;
    border-radius: 8px;
    padding: 0.4rem 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 80px;
}

.language-selector:hover {
    background: rgba(255, 255, 255, 0.3);
}

.language-selector option {
    background: #764ba2;
    color: white;
}

.logout-btn {
    border: 2px solid rgba(255, 255, 255, 0.5) !important;
    color: white !important;
    border-radius: 8px;
    padding: 0.4rem 1rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.logout-btn:hover {
    background: rgba(255, 255, 255, 0.2) !important;
    border-color: white !important;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* Top bar for non-authenticated pages */
.top-bar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.top-bar .btn-outline-light {
    border: 2px solid rgba(255, 255, 255, 0.5);
    color: white;
    border-radius: 8px;
    padding: 0.4rem 1rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.top-bar .btn-outline-light:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.language-selector-light {
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 6px;
    padding: 0.3rem 0.6rem;
    font-weight: 500;
    min-width: 70px;
}

.language-selector-light option {
    background: white;
    color: #764ba2;
}

/* Responsive navbar adjustments */
@media (max-width: 991px) {
    .modern-navbar .navbar-collapse {
        background: rgba(0, 0, 0, 0.1);
        border-radius: 10px;
        padding: 1rem;
        margin-top: 1rem;
    }

    .modern-navbar .nav-link {
        margin: 0.25rem 0;
    }

    .modern-navbar .d-flex {
        margin-top: 1rem;
        justify-content: space-between;
        width: 100%;
    }
}

/* Card Styles */
.card {
    border: none;
    border-radius: 10px;
    overflow: hidden;
}

.card-header {
    border-bottom: none;
    font-weight: 600;
}

/* Form Styles */
.form-control:focus,
.btn:focus {
    box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
}

/* Button Styles */
.btn {
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    background-color: #0b5ed7;
    transform: translateY(-2px);
}

.btn-success:hover {
    background-color: #157347;
    transform: translateY(-2px);
}

.btn-danger:hover {
    background-color: #bb2d3b;
}

/* Table Styles */
.table {
    background-color: white;
}

.table thead th {
    border-bottom: 2px solid var(--primary-color);
    font-weight: 600;
    color: var(--dark-color);
}

/* Alert Styles */
.alert {
    border: none;
    border-radius: 10px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* Code Styles */
code {
    background-color: #f8f9fa;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    font-size: 0.95rem;
    color: var(--dark-color);
    border: 1px solid #dee2e6;
}

/* List Group Styles */
.list-group-item {
    border: 1px solid rgba(0, 0, 0, 0.125);
    margin-bottom: 0.5rem;
    border-radius: 8px !important;
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    .display-4 {
        font-size: 2rem;
    }

    .card-body {
        padding: 1rem;
    }
}

/* Modern Footer */
.modern-footer {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.1);
    font-weight: 500;
    letter-spacing: 0.5px;
}

.modern-footer p {
    margin: 0;
    opacity: 0.95;
}

/* Alphabetical Section Headers */
.alphabet-header {
    display: flex;
    align-items: center;
    margin: 2rem 0 1rem 0;
}

.alphabet-letter {
    font-size: 3.5rem;
    font-weight: 800;
    color: #667eea;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 4px 8px rgba(102, 126, 234, 0.3);
    letter-spacing: 2px;
}