:root {
    --primary-color: #4a90e2;
    --success-color: #2ecc71;
    --bg-color: #f4f7f6;
    --card-bg: #ffffff;
    --text-color: #333;
    --secondary-text: #666;
    --border-radius: 12px;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.container {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    width: 90%;
    max-width: 500px;
    text-align: center;
}

header h1 {
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

header p {
    color: var(--secondary-text);
    margin-bottom: 2rem;
}

.progress-section {
    margin-bottom: 2rem;
}

.progress-bar-container {
    background-color: #e0e0e0;
    border-radius: 20px;
    height: 10px;
    width: 100%;
    overflow: hidden;
}

.progress-bar {
    background-color: var(--success-color);
    height: 100%;
    width: 0%;
    transition: width 0.3s ease;
}

#progressText {
    margin-top: 0.5rem;
    font-weight: bold;
    color: var(--secondary-text);
}

.checklist-section ul {
    list-style: none;
    padding: 0;
    text-align: left;
}

.checklist-item {
    background-color: #fff;
    border: 1px solid #eee;
    padding: 1rem;
    margin-bottom: 0.5rem;
    border-radius: 8px;
    display: flex;
    align-items: center;
    cursor: pointer;
    transition: all 0.2s ease;
}

.checklist-item:hover {
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    transform: translateY(-1px);
}

.checklist-item.completed {
    background-color: #f9f9f9;
    text-decoration: line-through;
    color: #aaa;
}

.checklist-item input[type="checkbox"] {
    margin-right: 1rem;
    transform: scale(1.2);
    cursor: pointer;
}

.controls {
    margin-top: 2rem;
}

.secondary-btn {
    background: none;
    border: 1px solid #ccc;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    color: var(--secondary-text);
    transition: all 0.2s;
}

.secondary-btn:hover {
    background-color: #eee;
    color: var(--text-color);
}

/* Simple Confetti CSS */
.confetti {
    position: fixed;
    width: 10px;
    height: 10px;
    background-color: #f00;
    animation: fall linear forwards;
}

@keyframes fall {
    to {
        transform: translateY(100vh) rotate(720deg);
    }
}