:root {
    --primary-color: #2c3e50;
    --secondary-color: #34495e;
    --accent-color: #3498db;
    --light-bg: #ecf0f1;
    --text-color: #2c3e50;
    --success-color: #27ae60;
}

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

body {
    font-family: system-ui, -apple-system, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--light-bg);
}

.container {
    display: grid;
    grid-template-columns: 1fr 2fr 1fr;
    gap: 2rem;
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

.card {
    background: white;
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

h1 {
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 2rem;
}

h2 {
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

/* Categories Column */
.categories {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.category {
    padding: 0.5rem;
    background: var(--light-bg);
    border-radius: 4px;
    cursor: pointer;
}

.category.active {
    background: var(--accent-color);
    color: white;
}

/* Tasks Column */
.tasks {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.task-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    background: var(--light-bg);
    border-radius: 4px;
    gap: 1rem;
}

.task-info {
    flex-grow: 1;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.task-points {
    font-weight: bold;
    color: var(--accent-color);
}

.add-task {
    margin-top: 1rem;
    padding: 0.5rem;
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.task-complete-btn {
    padding: 0.5rem 1rem;
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.task-complete-btn:disabled {
    background: #bdc3c7;
    cursor: not-allowed;
}

/* Certification Column */
.certification-tiers {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.tier {
    padding: 0.75rem;
    background: var(--light-bg);
    border-radius: 4px;
    display: flex;
    justify-content: space-between;
}

.tier.achieved {
    background: var(--success-color);
    color: white;
}

.points-total {
    font-size: 1.5rem;
    font-weight: bold;
    text-align: center;
    margin: 1rem 0;
}

.progress-bar {
    width: 100%;
    height: 10px;
    background: var(--light-bg);
    border-radius: 5px;
    margin: 0.5rem 0;
}

.progress-bar-fill {
    height: 100%;
    background: var(--accent-color);
    border-radius: 5px;
    transition: width 0.3s ease;
}

/* Task Form */
.task-form {
    display: none;
    margin-top: 1rem;
}

.task-form.active {
    display: block;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.form-actions {
    display: flex;
    gap: 1rem;
}

.btn {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

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

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

.export-import {
    margin-top: 1rem;
    display: flex;
    gap: 1rem;
}

/* History section */
.history {
    margin-top: 2rem;
    border-top: 1px solid #ddd;
    padding-top: 1rem;
}

.history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem;
    border-bottom: 1px solid #eee;
    font-size: 0.9rem;
}

.history-date {
    color: #666;
}