/* Base Styles */
:root {
    --primary-color: #4a6bff;
    --primary-hover: #3a5bd9;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --info-color: #17a2b8;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --light: #f8f9fa;
    --dark: #343a40;
    --border-color: #dee2e6;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

/* Layout */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background: transparent;
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    transition: var(--transition);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

header:not(.header) {
    /* background: linear-gradient(135deg, #4a6bff, #6c5ce7); */
    color: white;
    padding: 2rem 0;
    text-align: center;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
    margin-top: 70px;
}

/* Calculator Grid */
.calculator-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

/* Cards */
.calculator-card {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: var(--transition);
}

.calculator-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.card-header {
    background: var(--primary-color);
    color: white;
    padding: 1rem 1.5rem;
}

.card-header h2 {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 600;
}

.card-body {
    padding: 1.5rem;
}

/* Form Elements */
.form-group {
    margin-bottom: 1.25rem;
}

.form-group:last-child {
    margin-bottom: 0;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--dark);
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    transition: var(--transition);
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(74, 107, 255, 0.25);
    outline: none;
}

.input-group {
    display: flex;
    align-items: center;
}

.input-group .form-control {
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
}

.input-group-text {
    padding: 0.75rem 1rem;
    background-color: var(--light);
    border: 1px solid var(--border-color);
    border-left: none;
    border-radius: 0 4px 4px 0;
    color: var(--secondary-color);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: var(--transition);
}

.btn i {
    margin-right: 0.5rem;
}

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

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

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

.btn-secondary:hover {
    background-color: #5a6268;
    transform: translateY(-2px);
}

.w-100 {
    width: 100%;
}

/* Distribution Buttons */
.distribution-buttons {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
}

.distribution-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 1rem 0.5rem;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

.distribution-btn i {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.distribution-btn:hover {
    border-color: var(--primary-color);
    background-color: rgba(74, 107, 255, 0.05);
}

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

.distribution-btn.active i {
    color: white;
}

/* Form Check */
.form-check {
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
}

.form-check-input {
    margin-right: 0.5rem;
    width: 1.1em;
    height: 1.1em;
}

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

/* Results */
#result {
    min-height: 200px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 2rem 0;
}

.result-placeholder {
    text-align: center;
    color: var(--secondary-color);
}

.result-placeholder i {
    margin-bottom: 1rem;
    opacity: 0.5;
}

.result-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1rem;
    text-align: center;
}

.result-percent {
    font-size: 1.5rem;
    color: var(--secondary-color);
    margin-left: 0.5rem;
}

.result-formula {
    font-family: 'Courier New', monospace;
    background: var(--light);
    padding: 0.75rem 1rem;
    border-radius: 4px;
    margin-top: 1rem;
    text-align: center;
}

/* Chart */
#probabilityChart {
    width: 100% !important;
    height: 250px !important;
}

/* How to Use Section */
.how-to-use {
    margin: 3rem 0;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: 2rem;
}

.how-to-use h2 {
    color: var(--dark);
    margin-bottom: 1.5rem;
    text-align: center;
}

.accordion-item {
    border: 1px solid var(--border-color);
    border-radius: 4px;
    margin-bottom: 0.75rem;
    overflow: hidden;
}

.accordion-button {
    width: 100%;
    text-align: left;
    padding: 1rem 1.5rem;
    background: white;
    border: none;
    font-weight: 500;
    color: var(--dark);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.accordion-button:not(.collapsed) {
    background-color: rgba(74, 107, 255, 0.05);
    color: var(--primary-color);
}

.accordion-button::after {
    content: '\f078';
    font-family: 'Font Awesome 5 Free';
    font-weight: 900;
    transition: var(--transition);
}

.accordion-button:not(.collapsed)::after {
    transform: rotate(-180deg);
}

.accordion-body {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-color);
}

/* Responsive Design */
@media (max-width: 768px) {
    .calculator-grid {
        grid-template-columns: 1fr;
    }
    
    .distribution-buttons {
        grid-template-columns: 1fr;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .result-value {
        font-size: 2rem;
    }
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeIn 0.3s ease-out forwards;
}

/* Utility Classes */
.d-none {
    display: none !important;
}

.text-center {
    text-align: center;
}

.mt-4 {
    margin-top: 1.5rem;
}

.mb-3 {
    margin-bottom: 1rem;
}

.text-muted {
    color: #6c757d !important;
}