:root {
    --primary:    #4361ee;
    --primary-dark:#3f37c9;
    --accent:     #f72585;
    --success:    #4cc9f0;
    --warning:    #ff9f1c;
    --danger:     #f94144;
    --light:      #f8f9fa;
    --dark:       #212529;
    --gradient:   linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --card-shadow:0 10px 30px rgba(67,97,238,0.18);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* { box-sizing: border-box; }

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Open Sans', sans-serif;
    background: linear-gradient(135deg, #f5f7ff 0%, #f0f4ff 100%);
    color: #333;
    min-height: 100vh;
    margin: 0;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, .display-4 {
    font-family: 'Poppins', sans-serif;
    font-weight: 700;
    color: var(--primary);
    letter-spacing: -0.5px;
}

.navbar { 
    background: var(--gradient) !important; 
    padding: 1.1rem 0;
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.2);
}

/* Cards */
.card {
    border: none;
    border-radius: 1.2rem;
    overflow: hidden;
    box-shadow: 0 8px 24px rgba(67,97,238,0.15);
    transition: var(--transition);
    background: white;
    border: 1px solid rgba(255,255,255,0.8);
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(67,97,238,0.25);
}

.card-header {
    background: linear-gradient(135deg, rgba(67,97,238,0.1) 0%, rgba(118,75,162,0.05) 100%);
    border-bottom: 2px solid rgba(67,97,238,0.1);
    padding: 1.5rem;
}

.card-header h3 {
    margin: 0;
    font-size: 1.5rem;
}

/* Buttons */
.btn {
    border-radius: 50px;
    padding: 0.75rem 2rem;
    font-weight: 600;
    transition: var(--transition);
    border: none;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-size: 0.9rem;
    box-shadow: 0 4px 12px rgba(67,97,238,0.25);
}

.btn:hover {
    box-shadow: 0 8px 20px rgba(67,97,238,0.35);
}

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

.btn-primary:hover { 
    background-color: var(--primary-dark); 
    border-color: var(--primary-dark); 
    transform: translateY(-3px);
}

.btn-primary:active {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(67,97,238,0.25);
}

.btn-outline-primary { 
    border: 2px solid var(--primary); 
    color: var(--primary);
    background-color: white;
    box-shadow: none;
}

.btn-outline-primary:hover { 
    background-color: var(--primary); 
    color: white;
    box-shadow: 0 8px 20px rgba(67,97,238,0.35);
}

.btn-sm {
    padding: 0.5rem 1.2rem;
    font-size: 0.85rem;
}

/* Badges */
.badge-whiz { background: linear-gradient(90deg, #ffd700, #ffea80); color: #333; font-weight: 600; padding: 0.6em 1.2em; border-radius: 50px; }
.badge-good { background: linear-gradient(90deg, #c0c0c0, #e8e8e8); color: #333; }
.badge-try { background: linear-gradient(90deg, #cd7f32, #e8a55f); color: white; }

/* List group items (dashboard cards) */
.list-group-item {
    border: none !important;
    border-radius: 1rem !important;
    margin-bottom: 1.5rem;
    padding: 1.5rem;
    background: white;
    box-shadow: 0 6px 18px rgba(0,0,0,0.06);
    transition: var(--transition);
    border-left: 4px solid var(--primary) !important;
}

.list-group-item:hover {
    transform: translateX(10px);
    box-shadow: 0 12px 32px rgba(67,97,238,0.22);
    background: linear-gradient(90deg, rgba(67,97,238,0.05), white);
}

/* Animations */
.fade-in-up { 
    animation: fadeInUp 0.6s ease-out forwards; 
}

@keyframes fadeInUp {
    from { 
        opacity: 0; 
        transform: translateY(30px); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0); 
    }
}

.bounce { 
    animation: bounce 1.2s ease-in-out; 
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}

/* Forms */
.form-control, .form-select {
    border-radius: 0.9rem;
    padding: 0.85rem 1.2rem;
    border: 2px solid #e0e7ff;
    background-color: white;
    font-size: 1rem;
    transition: var(--transition);
}

.form-control:focus, .form-select:focus { 
    border-color: var(--primary);
    box-shadow: 0 0 0 0.3rem rgba(67,97,238,0.15);
    background-color: white;
}

.form-control::placeholder {
    color: #b0b8d4;
    font-weight: 500;
}

.form-check {
    margin-bottom: 1rem;
    padding: 1rem;
    border: 2px solid #e0e7ff;
    border-radius: 0.9rem;
    transition: var(--transition);
}

.form-check:hover {
    border-color: var(--primary);
    background-color: rgba(67,97,238,0.03);
}

.form-check-input {
    width: 1.3rem;
    height: 1.3rem;
    margin-top: 0.25rem;
    cursor: pointer;
    border: 2px solid #d0d7e8;
    border-radius: 0.4rem;
    transition: var(--transition);
}

.form-check-input:checked {
    background-color: var(--primary);
    border-color: var(--primary);
    box-shadow: 0 0 0 0.25rem rgba(67,97,238,0.25);
}

.form-check-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 0.25rem rgba(67,97,238,0.25);
}

.form-check-label {
    cursor: pointer;
    margin-bottom: 0;
    margin-left: 0.5rem;
    font-weight: 500;
    color: #444;
}

.form-label {
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 0.6rem;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

/* Progress bars */
.progress { 
    height: 28px; 
    border-radius: 50px; 
    background-color: #e9ecef;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.06);
}

.progress-bar { 
    background: var(--gradient);
    font-weight: 600;
    box-shadow: 0 2px 8px rgba(67,97,238,0.3);
}

/* Icons */
.bi { 
    vertical-align: -0.125em;
    margin-right: 0.25rem;
}

/* Accordion for definitions */
.accordion-button { 
    border-radius: 1rem !important;
    font-weight: 600;
    padding: 1rem 1.5rem;
    background-color: white;
    color: var(--primary);
    border: 2px solid #e0e7ff !important;
}

.accordion-item { 
    box-shadow: var(--card-shadow);
    border: none !important;
    border-radius: 1rem !important;
    margin-bottom: 1rem;
    overflow: hidden;
}

.accordion-button:not(.collapsed) { 
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white !important;
    box-shadow: 0 4px 12px rgba(67,97,238,0.3);
}

.accordion-button:focus { 
    box-shadow: 0 0 0 0.25rem rgba(67,97,238,0.25);
    border-color: var(--primary) !important;
}

.accordion-body {
    padding: 1.5rem;
}

/* Badges */
.badge {
    padding: 0.7rem 1.2rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.85rem;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.badge-whiz { 
    background: linear-gradient(90deg, #ffd700, #ffea80); 
    color: #333; 
}

.badge-good { 
    background: linear-gradient(90deg, #c0c0c0, #e8e8e8); 
    color: #333; 
}

.badge-try { 
    background: linear-gradient(90deg, #cd7f32, #e8a55f); 
    color: white; 
}

/* Footer */
footer {
    background: linear-gradient(135deg, #212529 0%, #1a1f26 100%) !important;
    margin-top: auto;
    box-shadow: inset 0 2px 8px rgba(0,0,0,0.2);
}

footer p {
    margin-bottom: 0.5rem;
}

/* Responsive */
@media (max-width: 768px) {
    h1, .display-4 {
        font-size: 2rem;
    }

    .card {
        margin-bottom: 1rem;
    }

    .btn {
        width: 100%;
        margin-bottom: 0.5rem;
    }

    main.container {
        padding-left: 1rem;
        padding-right: 1rem;
    }

    .form-check {
        padding: 0.75rem;
    }
}

/* Text utilities */
.text-white-75 {
    color: rgba(255, 255, 255, 0.75) !important;
}

/* Hover effects */
a {
    transition: var(--transition);
}

a:hover {
    text-decoration: none;
}