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

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f4f4f4;
}

/* Header Styles */
header {
    background-color: #333;
    color: #fff;
    padding: 1rem;
    text-align: center;
}

header h1 {
    margin-bottom: 0.5rem;
}

header a {
    color: #fff;
    text-decoration: none;
}

header a:hover {
    text-decoration: underline;
}

/* Main Content Styles */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

section {
    margin-bottom: 3rem;
    background-color: #fff;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

section h2 {
    margin-bottom: 1.5rem;
    color: #333;
    border-bottom: 2px solid #f4f4f4;
    padding-bottom: 0.5rem;
}

/* Subject Cards Styles */
.subject-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.subject-card {
    background-color: #f9f9f9;
    padding: 2rem;
    border-radius: 8px;
    text-align: center;
    text-decoration: none;
    color: #333;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid #e0e0e0;
}

.subject-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    background-color: #f0f0f0;
}

.subject-card h3 {
    margin: 0;
    font-size: 1.2rem;
}

/* Form Styles */
.form-group {
    margin-bottom: 1rem;
}

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

.form-group input {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

button {
    background-color: #333;
    color: #fff;
    padding: 1rem 2rem;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

button:hover {
    background-color: #555;
}

/* Planner Stats Styles */
#planner-stats {
    margin-top: 2rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

#progress-section,
#chart-section {
    padding: 1.5rem;
    background-color: #f9f9f9;
    border-radius: 8px;
}

#progress-section h3,
#chart-section h3 {
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

/* Progress Bar Styles */
.progress-bar-container {
    position: relative;
    height: 20px;
    background-color: #e0e0e0;
    border-radius: 10px;
    overflow: hidden;
    cursor: pointer;
}

.progress-bar {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    background-color: #333;
    border-radius: 10px;
    width: 0%;
    transition: width 0.5s ease;
}

.progress-handle {
    position: absolute;
    top: 50%;
    right: -8px;
    transform: translateY(-50%);
    width: 16px;
    height: 16px;
    background-color: #555;
    border-radius: 50%;
    cursor: grab;
    box-shadow: 0 1px 3px rgba(0,0,0,0.3);
}

.progress-handle:active {
    cursor: grabbing;
}

.progress-text {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: bold;
    color: #333;
    pointer-events: none;
}

/* Workload Chart Styles */
.workload-chart {
    height: 200px;
    position: relative;
    background-color: #f0f0f0;
    border-radius: 8px;
    padding: 1rem;
    overflow-x: auto;
}

.chart-column {
    position: absolute;
    bottom: 1rem;
    width: 30px;
    background-color: #333;
    border-radius: 4px 4px 0 0;
    transition: height 0.5s ease;
}

.chart-column-label {
    position: absolute;
    bottom: 0;
    width: 30px;
    text-align: center;
    font-size: 0.7rem;
    color: #666;
    white-space: nowrap;
    transform: rotate(-45deg);
    transform-origin: bottom left;
    margin-left: 15px;
    margin-bottom: 5px;
}

/* Plan Result Styles */
#plan-result {
    margin-top: 2rem;
    padding: 1rem;
    background-color: #f9f9f9;
    border-radius: 8px;
}

#plan-result h3 {
    margin-bottom: 1rem;
}

.plan-day {
    margin-bottom: 1.5rem;
    padding: 1rem;
    background-color: #fff;
    border-radius: 4px;
    border-left: 4px solid #333;
}

.plan-day h4 {
    margin-bottom: 0.5rem;
}

.plan-day ul {
    list-style-type: none;
    padding-left: 1rem;
}

.plan-day li {
    margin-bottom: 0.3rem;
}

/* Check-in Result Styles */
#check-in-result {
    margin-top: 2rem;
}

#summary-content {
    padding: 1rem;
    background-color: #f9f9f9;
    border-radius: 8px;
    margin-bottom: 1rem;
}

#study-chart {
    height: 200px;
    background-color: #f9f9f9;
    border-radius: 8px;
    padding: 1rem;
    position: relative;
}

.chart-bar {
    position: absolute;
    bottom: 1rem;
    width: 50px;
    background-color: #333;
    border-radius: 4px 4px 0 0;
    transition: height 0.5s ease;
}

.chart-label {
    position: absolute;
    bottom: 0;
    width: 50px;
    text-align: center;
    font-size: 0.8rem;
    color: #666;
}

/* Units Container Styles */
.units-container {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.unit-card {
    background-color: #f9f9f9;
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid #e0e0e0;
}

.unit-card h3 {
    margin-bottom: 1rem;
    color: #333;
}

.unit-resources {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.resource-link {
    background-color: #fff;
    padding: 0.8rem 1.2rem;
    border-radius: 4px;
    text-decoration: none;
    color: #333;
    border: 1px solid #ddd;
    transition: background-color 0.3s ease;
}

.resource-link:hover {
    background-color: #f0f0f0;
}

/* Footer Styles */
footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 1rem;
    margin-top: 3rem;
}

/* Responsive Styles */
@media (max-width: 768px) {
    main {
        padding: 1rem;
    }
    
    section {
        padding: 1.5rem;
    }
    
    .subject-cards {
        grid-template-columns: 1fr;
    }
    
    .unit-resources {
        flex-direction: column;
    }
}