:root {
    --primary-color: #6d5aee;
    --secondary-color: #9c5fff;
    --accent-color: #ff2a6d;
    --success-color: #05ffa1;
    --warning-color: #f7b538;
    --danger-color: #ff5252;
    --dark-bg: #121212;
    --card-bg: #1e1e1e;
    --surface-1: #252525;
    --surface-2: #2d2d2d;
    --text-primary: #f8f9fa;
    --text-secondary: #b0b0b0;
    --text-tertiary: #808080;
    --border-color: #333333;
    --border-radius: 10px;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    --transition: all 0.3s ease;
    --card-hover-transform: translateY(-5px);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    background-color: var(--dark-bg);
    color: var(--text-primary);
    min-height: 100vh;
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(109, 90, 238, 0.05) 0%, transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(255, 42, 109, 0.05) 0%, transparent 30%);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
    padding: 20px 0;
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    z-index: 1;
}

header h1 {
    color: var(--primary-color);
    margin-bottom: 5px;
    font-weight: 700;
    letter-spacing: 1px;
}

header p {
    color: var(--text-secondary);
}

section {
    margin-bottom: 30px;
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 20px;
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 5px;
    height: 100%;
    background: linear-gradient(180deg, var(--primary-color), var(--secondary-color));
    z-index: 1;
}

h2 {
    color: var(--text-primary);
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--border-color);
    font-weight: 600;
    letter-spacing: 0.5px;
}

h3 {
    color: var(--text-primary);
    font-size: 1.1rem;
    margin-bottom: 10px;
    font-weight: 500;
}

/* Dashboard */
.dashboard {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.exam-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 15px;
    margin-top: 15px;
}

.exam-card {
    background-color: var(--surface-1);
    border-radius: var(--border-radius);
    padding: 15px;
    border-left: 5px solid var(--primary-color);
    transition: var(--transition);
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.2);
}

.exam-card:hover {
    transform: var(--card-hover-transform);
    box-shadow: 0 15px 20px rgba(0, 0, 0, 0.3);
    background-color: var(--surface-2);
}

.exam-card h3 {
    font-size: 1.2rem;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.exam-date {
    font-size: 0.9rem;
    color: var(--text-tertiary);
    margin-bottom: 15px;
}

.countdown {
    font-weight: bold;
    font-size: 1.5rem;
    color: var(--primary-color);
    text-shadow: 0 0 10px rgba(109, 90, 238, 0.3);
}

.confidence {
    margin-top: 10px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.confidence-level {
    display: inline-block;
    height: 10px;
    border-radius: 5px;
    background-color: var(--border-color);
    width: 100%;
    margin-top: 5px;
    overflow: hidden;
    position: relative;
}

.confidence-fill {
    height: 100%;
    border-radius: 5px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    position: relative;
}

.confidence-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        90deg, 
        rgba(255, 255, 255, 0.1) 0%, 
        rgba(255, 255, 255, 0.2) 50%, 
        rgba(255, 255, 255, 0.1) 100%
    );
    background-size: 200% 100%;
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { background-position: 100% 0; }
    100% { background-position: -100% 0; }
}

/* Progress metrics */
.progress-metrics {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 15px;
}

.metric {
    background-color: var(--surface-1);
    border-radius: var(--border-radius);
    padding: 15px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.metric:hover {
    transform: translateY(-3px);
    background-color: var(--surface-2);
    box-shadow: 0 10px 15px rgba(0, 0, 0, 0.2);
}

.metric-value {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-top: 10px;
    text-shadow: 0 0 10px rgba(109, 90, 238, 0.3);
}

.progress-bar-container {
    height: 15px;
    background-color: var(--border-color);
    border-radius: 7.5px;
    margin-top: 15px;
    overflow: hidden;
    position: relative;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--success-color));
    width: 0%;
    transition: width 0.8s ease;
    position: relative;
}

/* Subject progress */
.subject-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 15px;
}

.subject-card {
    background-color: var(--surface-1);
    border-radius: var(--border-radius);
    padding: 15px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
}

.subject-card:hover {
    transform: var(--card-hover-transform);
    box-shadow: 0 15px 20px rgba(0, 0, 0, 0.3);
    background-color: var(--surface-2);
}

.subject-name {
    font-weight: bold;
    margin-bottom: 10px;
    color: var(--text-primary);
    font-size: 1.1rem;
}

.subject-exam-date {
    font-size: 0.9rem;
    color: var(--text-tertiary);
    margin-bottom: 10px;
}

.subject-progress-bar {
    height: 8px;
    background-color: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 10px;
    position: relative;
}

.subject-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--success-color));
    transition: width 0.8s ease;
    position: relative;
}

.subject-sessions {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

/* Study Days Tracking */
.subject-study-days {
    font-size: 0.9rem;
    margin-top: 10px;
    padding-top: 8px;
    border-top: 1px dashed var(--border-color);
}

.remaining-days {
    font-weight: 500;
    margin-bottom: 4px;
    color: var(--text-secondary);
}

.days-count {
    font-weight: bold;
    font-size: 1.1rem;
    color: var(--accent-color);
}

.study-days-progress {
    font-size: 0.85rem;
    color: var(--text-tertiary);
}

.completed-days, .total-days {
    font-weight: 600;
    color: var(--text-secondary);
}

/* Filter controls */
.filter-controls {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.filter-btn {
    background-color: var(--surface-1);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 8px 16px;
    border-radius: 50px;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

.filter-btn:hover {
    background-color: var(--surface-2);
    transform: translateY(-2px);
}

.filter-btn.active {
    background-color: var(--primary-color);
    color: var(--text-primary);
    border-color: var(--primary-color);
}

/* Study schedule */
.study-day {
    background-color: var(--surface-1);
    border-radius: var(--border-radius);
    margin-bottom: 15px;
    border: 1px solid var(--border-color);
    overflow: hidden;
    transition: var(--transition);
}

.study-day:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.study-day-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 15px;
    background-color: var(--surface-2);
    border-bottom: 1px solid var(--border-color);
}

.study-date {
    font-weight: 600;
    color: var(--text-primary);
}

.day-status {
    padding: 4px 10px;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
}

.status-upcoming {
    background-color: rgba(109, 90, 238, 0.2);
    color: var(--primary-color);
    border: 1px solid rgba(109, 90, 238, 0.3);
}

.status-today {
    background-color: rgba(255, 42, 109, 0.2);
    color: var(--accent-color);
    border: 1px solid rgba(255, 42, 109, 0.3);
}

.status-completed {
    background-color: rgba(5, 255, 161, 0.2);
    color: var(--success-color);
    border: 1px solid rgba(5, 255, 161, 0.3);
}

.status-exam {
    background-color: rgba(247, 181, 56, 0.2);
    color: var(--warning-color);
    border: 1px solid rgba(247, 181, 56, 0.3);
}

.study-day-content {
    padding: 15px;
}

.study-session {
    display: flex;
    margin-bottom: 12px;
    padding-bottom: 12px;
    border-bottom: 1px dashed var(--border-color);
}

.study-session:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.session-subject {
    font-weight: bold;
    font-size: 1.1rem;
    margin-bottom: 5px;
}

.session-focus {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.session-checkbox {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background-color: var(--surface-2);
    border: 2px solid var(--border-color);
    margin-right: 12px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    color: transparent;
    font-weight: bold;
}

.session-checkbox:hover {
    transform: scale(1.1);
    border-color: var(--primary-color);
}

.session-checkbox.completed {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.session-details {
    flex-grow: 1;
}

/* Responsive adjustments */
@media screen and (max-width: 768px) {
    .dashboard {
        grid-template-columns: 1fr;
    }
    
    .subject-cards, 
    .progress-metrics, 
    .exam-cards {
        grid-template-columns: 1fr;
    }
    
    .filter-controls {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .filter-btn {
        margin-bottom: 8px;
    }
    
    section::before {
        width: 100%;
        height: 5px;
    }
}