:root {
    --bg-color: #f4f7f9;
    --card-bg-color: #ffffff;
    --text-color: #333;
    --primary-color: #007bff;
    --primary-light-color: #e6f2ff;
    --border-color: #e0e0e0;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    --font-sans: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 2rem;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 2rem;
}

h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.subject-card {
    background-color: var(--card-bg-color);
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    box-shadow: var(--shadow);
    text-decoration: none;
    color: var(--text-color);
    transition: transform 0.2s, box-shadow 0.2s;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.subject-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}

.subject-card h2 {
    margin-top: 0;
    font-size: 1.5rem;
}

.subject-link {
    color: var(--primary-color);
    font-weight: 600;
    margin-top: 1rem;
}

/* Progress Circle */
.progress-circle, .main-progress-container {
    position: relative;
    margin: 1rem auto;
    width: 120px;
    height: 120px;
}

.main-progress-container {
    width: 150px;
    height: 150px;
}

.progress-circle svg {
    transform: rotate(-90deg);
}

.progress-circle__track, .progress-circle__progress {
    fill: none;
    stroke-width: 10;
}

.progress-circle__track {
    stroke: #eee;
}

.progress-circle__progress {
    stroke: var(--primary-color);
    transition: stroke-dashoffset 0.5s ease;
}

.progress-circle__text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
}

.main-progress-container .progress-circle__text {
    font-size: 2rem;
}

/* Checklist Page */
.page-header {
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 1.5rem;
    margin-bottom: 2rem;
}

.back-link {
    display: inline-block;
    margin-bottom: 1rem;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
}

#checklist-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.checklist-section {
    background: var(--card-bg-color);
    border-radius: 12px;
    box-shadow: var(--shadow);
    padding: 1.5rem 2rem;
}

.checklist-section h3 {
    font-size: 1.75rem;
    color: var(--primary-color);
    margin-top: 0;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.75rem;
    margin-bottom: 1rem;
}

.checklist-item {
    display: flex;
    align-items: center;
    padding: 0.75rem 0;
    border-bottom: 1px solid #f0f0f0;
}
.checklist-item:last-child {
    border-bottom: none;
}

.checklist-item label {
    display: flex;
    align-items: center;
    cursor: pointer;
    flex-grow: 1;
}

.checklist-item input[type="checkbox"] {
    width: 1.25rem;
    height: 1.25rem;
    margin-right: 1rem;
    accent-color: var(--primary-color);
}

.checklist-item .item-text {
    flex-grow: 1;
}

.checklist-item .item-weight {
    font-size: 0.9rem;
    color: #888;
    background-color: #f4f7f9;
    padding: 0.2rem 0.6rem;
    border-radius: 6px;
}

.checklist-item input:checked + .item-text {
    text-decoration: line-through;
    color: #999;
}