/* Page Header */
.page-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--white);
    padding: 60px 0 40px;
    margin-bottom: 60px;
    position: relative;
    overflow: hidden;
}

.page-header::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    border-radius: 50%;
}

.page-header .header-content {
    text-align: center;
    position: relative;
    z-index: 1;
}

.page-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
}

.page-header p {
    font-size: 1.1rem;
    opacity: 0.95;
}

/* Filter Tabs */
.filter-tabs {
    display: flex;
    gap: 12px;
    margin-bottom: 40px;
    overflow-x: auto;
    padding-bottom: 8px;
}

.filter-tab {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    background: var(--white);
    border: 2px solid var(--primary-light);
    border-radius: 50px;
    color: var(--text-dark);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.filter-tab:hover {
    background: var(--primary-light);
    border-color: var(--primary-color);
    color: var(--primary-dark);
    transform: translateY(-2px);
}

.filter-tab.active {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-color: var(--primary-dark);
    color: var(--white);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
    margin-bottom: 40px;
}

.stat-card {
    background: var(--white);
    border-radius: 16px;
    padding: 24px;
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    gap: 16px;
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
}

.stat-icon.high {
    background: linear-gradient(135deg, #ffebee, #ffcdd2);
    color: #c62828;
}

.stat-icon.medium {
    background: linear-gradient(135deg, #fff3e0, #ffe0b2);
    color: #ef6c00;
}

.stat-icon.low {
    background: linear-gradient(135deg, #e8f5e9, #c8e6c9);
    color: #388e3c;
}

.stat-info h3 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 4px;
}

.stat-info p {
    font-size: 0.9rem;
    color: var(--text-light);
}

/* Deadlines Container */
.deadlines-container {
    display: grid;
    gap: 24px;
    margin-bottom: 60px;
}

/* Deadline Card */
.deadline-card {
    background: var(--white);
    border-radius: 20px;
    padding: 32px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border-left: 5px solid var(--primary-color);
    position: relative;
    overflow: hidden;
}

.deadline-card.expired {
    opacity: 0.6;
    border-left-color: var(--text-light);
    background: #f5f5f5;
}

.deadline-card.expired .deadline-title {
    text-decoration: line-through;
}

.deadline-card.priority-high {
    border-left-color: #c62828;
}

.deadline-card.priority-medium {
    border-left-color: #ef6c00;
}

.deadline-card.priority-low {
    border-left-color: #388e3c;
}

.deadline-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

/* Deadline Header */
.deadline-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 16px;
    gap: 16px;
}

.deadline-title-section {
    flex: 1;
}

.deadline-title {
    font-size: 1.5rem;
    color: var(--text-dark);
    margin-bottom: 8px;
    font-weight: 700;
}

.deadline-subject {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 16px;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    background: linear-gradient(135deg, var(--primary-light), rgba(0, 188, 212, 0.2));
    color: var(--primary-dark);
}

/* Priority Badge */
.priority-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.priority-badge.high {
    background: linear-gradient(135deg, #ffebee, #ffcdd2);
    color: #c62828;
}

.priority-badge.medium {
    background: linear-gradient(135deg, #fff3e0, #ffe0b2);
    color: #ef6c00;
}

.priority-badge.low {
    background: linear-gradient(135deg, #e8f5e9, #c8e6c9);
    color: #388e3c;
}

/* Deadline Description */
.deadline-description {
    color: var(--text-dark);
    line-height: 1.6;
    margin-bottom: 20px;
    font-size: 1rem;
}

/* Deadline Footer */
.deadline-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
    padding-top: 20px;
    border-top: 2px solid var(--bg-light);
}

.deadline-time {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.deadline-date {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-dark);
    font-weight: 600;
    font-size: 1.1rem;
}

.deadline-date i {
    color: var(--primary-color);
}

/* Countdown Timer */
.countdown-timer {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: linear-gradient(135deg, #fff3e0, #ffe0b2);
    border-radius: 50px;
    font-weight: 600;
    color: #ef6c00;
}

.countdown-timer.urgent {
    background: linear-gradient(135deg, #ffebee, #ffcdd2);
    color: #c62828;
    animation: pulse 2s ease-in-out infinite;
}

.countdown-timer.expired {
    background: #f5f5f5;
    color: var(--text-light);
}

.countdown-timer i {
    font-size: 1rem;
}

/* Submit Button */
.submit-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--white);
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: var(--transition);
    box-shadow: 0 4px 12px rgba(0, 188, 212, 0.3);
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 188, 212, 0.4);
}

.submit-btn.disabled {
    background: #e0e0e0;
    color: #9e9e9e;
    cursor: not-allowed;
    box-shadow: none;
}

.submit-btn.disabled:hover {
    transform: none;
}

/* Loading & Empty States */
.loading-state {
    text-align: center;
    padding: 80px 20px;
    color: var(--text-light);
}

.loading-state i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 16px;
}

.empty-state {
    text-align: center;
    padding: 80px 20px;
    background: var(--white);
    border-radius: 20px;
    box-shadow: var(--shadow-sm);
}

.empty-state i {
    font-size: 4rem;
    color: var(--primary-light);
    margin-bottom: 24px;
}

.empty-state h3 {
    font-size: 1.8rem;
    color: var(--text-dark);
    margin-bottom: 12px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .page-header h1 {
        font-size: 1.8rem;
        flex-direction: column;
    }

    .filter-tabs {
        gap: 8px;
    }

    .filter-tab {
        padding: 10px 16px;
        font-size: 0.9rem;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .deadline-card {
        padding: 24px;
    }

    .deadline-title {
        font-size: 1.3rem;
    }

    .deadline-header {
        flex-direction: column;
    }

    .deadline-footer {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 480px) {
    .page-header h1 {
        font-size: 1.5rem;
    }

    .deadline-title {
        font-size: 1.2rem;
    }
}