:root {
    --primary-color: #7c4dff;
    --primary-dark: #5e35b1;
    --primary-light: #b39ddb;
    --secondary-color: #ff4081;
    --secondary-dark: #c60055;
    --secondary-light: #ff79b0;
    --success-color: #00c853;
    --warning-color: #ffab00;
    --neutral-dark: #455a64;
    --neutral-light: #eceff1;
    --white: #ffffff;
    --box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Poppins', sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #e2e8f0 100%);
    color: var(--neutral-dark);
    line-height: 1.6;
    padding: 20px;
    min-height: 100vh;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
    color: var(--primary-color);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    color: transparent;
}

header p {
    color: var(--neutral-dark);
    font-size: 1.1rem;
}

.calculator-card {
    background: var(--white);
    border-radius: 16px;
    box-shadow: var(--box-shadow);
    overflow: hidden;
    margin-bottom: 30px;
}

.tabs {
    display: flex;
    border-bottom: 1px solid var(--neutral-light);
    background-color: var(--neutral-light);
}

.tab-btn {
    flex: 1;
    padding: 15px;
    background: none;
    border: none;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    color: var(--neutral-dark);
    position: relative;
    overflow: hidden;
}

.tab-btn:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 3px;
    background: var(--primary-color);
    transition: var(--transition);
}

.tab-btn:hover {
    color: var(--primary-color);
}

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

.tab-btn.active:after {
    width: 100%;
}

.tab-content {
    padding: 30px;
}

.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    0% { opacity: 0; transform: translateY(10px); }
    100% { opacity: 1; transform: translateY(0); }
}

.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}

.form-control {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--neutral-light);
    border-radius: 8px;
    font-size: 1rem;
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-light);
    box-shadow: 0 0 0 3px rgba(124, 77, 255, 0.2);
}

.input-group {
    position: relative;
}

.currency-symbol {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--neutral-dark);
}

.input-group .form-control {
    padding-left: 30px;
}

.button-group {
    display: flex;
    justify-content: space-between;
    margin-top: 30px;
}

button {
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
    border: none;
    font-family: 'Poppins', sans-serif;
}

.next-btn, .btn-calculate {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 12px 24px;
    border-radius: 8px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.next-btn:hover, .btn-calculate:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 10px rgba(0, 0, 0, 0.1);
}

.prev-btn {
    background-color: var(--neutral-light);
    color: var(--neutral-dark);
    padding: 12px 24px;
    border-radius: 8px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.prev-btn:hover {
    background-color: #dde2e6;
}

.btn-reset {
    background-color: var(--warning-color);
    color: var(--white);
    padding: 12px 24px;
    border-radius: 8px;
}

.btn-reset:hover {
    background-color: #f09000;
}

.btn-add-project {
    background-color: var(--secondary-color);
    color: var(--white);
    padding: 10px 20px;
    border-radius: 8px;
    margin-right: 10px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-add-project:hover {
    background-color: var(--secondary-dark);
}

#project-count-info {
    color: var(--neutral-dark);
    font-style: italic;
}

/* Projects Styling */
.projects-info {
    margin-bottom: 20px;
    color: var(--neutral-dark);
}

.project-controls {
    display: flex;
    align-items: center;
    margin: 20px 0;
}

#projects-container {
    max-height: 550px;
    overflow-y: auto;
    padding: 5px;
}

.project-card {
    background-color: var(--neutral-light);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
    position: relative;
    border-left: 5px solid var(--primary-color);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.project-number {
    color: var(--primary-color);
}

.remove-project-btn {
    background: none;
    border: none;
    color: #ff5252;
    font-size: 1.2rem;
    cursor: pointer;
    transition: var(--transition);
}

.remove-project-btn:hover {
    transform: scale(1.2);
}

/* Results Styling */
.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.result-box {
    background: linear-gradient(135deg, var(--neutral-light), #f9f9f9);
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--neutral-light);
}

.result-box:hover {
    transform: translateY(-5px);
    box-shadow: var(--box-shadow);
}

.result-box h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.1rem;
}

.result-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--neutral-dark);
}

.results-breakdown {
    background-color: var(--neutral-light);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 30px;
}

.results-breakdown h3 {
    margin-bottom: 15px;
    color: var(--primary-color);
}

.breakdown-item {
    display: flex;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.breakdown-item:last-child {
    border-bottom: none;
}

/* Project Profit Chart Styling */
.project-profit-chart {
    background-color: var(--neutral-light);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 30px;
}

.project-profit-chart h3 {
    margin-bottom: 10px;
    color: var(--primary-color);
}

.chart-description {
    color: var(--neutral-dark);
    font-size: 0.9rem;
    margin-bottom: 15px;
    font-style: italic;
}

#profit-chart-container {
    margin-top: 15px;
}

.chart-bar-container {
    display: flex;
    margin-bottom: 12px;
    align-items: center;
}

.chart-label {
    width: 120px;
    font-size: 0.9rem;
    font-weight: 500;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.chart-bar-wrapper {
    flex-grow: 1;
    background-color: rgba(0, 0, 0, 0.05);
    height: 25px;
    border-radius: 4px;
    position: relative;
    overflow: hidden;
}

.chart-bar {
    height: 100%;
    transition: width 1s ease-out;
    border-radius: 4px;
    position: relative;
}

.chart-bar.positive {
    background: linear-gradient(90deg, var(--success-color), #64dd17);
}

.chart-bar.negative {
    background: linear-gradient(90deg, #ff5252, #ff1744);
}

.chart-value {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--white);
    font-weight: 600;
    font-size: 0.85rem;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

.chart-value.outside {
    right: -65px;
    color: var(--neutral-dark);
    text-shadow: none;
}

.celebration {
    text-align: center;
    background: linear-gradient(135deg, var(--success-color), #64dd17);
    color: var(--white);
    padding: 30px;
    border-radius: 12px;
    margin: 30px 0;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(0, 200, 83, 0.4); }
    70% { box-shadow: 0 0 0 15px rgba(0, 200, 83, 0); }
    100% { box-shadow: 0 0 0 0 rgba(0, 200, 83, 0); }
}

.celebration h2 {
    margin-bottom: 15px;
    font-size: 1.8rem;
}

#celebration-profit {
    font-weight: 700;
    font-size: 1.2rem;
}

.centered {
    text-align: center;
    padding: 40px 0;
}

.btn-calculate {
    font-size: 1.2rem;
    padding: 15px 30px;
    margin-bottom: 15px;
}

.hidden {
    display: none;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
}

.modal-content {
    background-color: var(--white);
    margin: 10% auto;
    padding: 30px;
    border-radius: 12px;
    max-width: 600px;
    box-shadow: var(--box-shadow);
    position: relative;
}

.close {
    position: absolute;
    top: 15px;
    right: 15px;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}

.modal-content h2 {
    color: var(--primary-color);
    margin-bottom: 20px;
}

.modal-content ol {
    margin-left: 20px;
    margin-bottom: 20px;
}

.modal-content li {
    margin-bottom: 10px;
}

.modal-content code {
    display: block;
    background-color: var(--neutral-light);
    padding: 15px;
    border-radius: 8px;
    margin: 10px 0;
    font-family: monospace;
    white-space: pre-wrap;
}

footer {
    text-align: center;
    color: var(--neutral-dark);
    margin-top: 30px;
    font-size: 0.9rem;
}

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

/* Confetti Container */
#confetti-container {
    position: fixed;
    z-index: 100;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

/* Responsive Styles */
@media screen and (max-width: 768px) {
    .tab-content {
        padding: 20px;
    }
    
    .button-group {
        flex-direction: column;
        gap: 15px;
    }
    
    .button-group button {
        width: 100%;
    }
    
    .results-grid {
        grid-template-columns: 1fr;
    }
    
    header h1 {
        font-size: 2rem;
    }
}