/* ========================================
   Component Styles
   ======================================== */

/* Session Card */
.sessions-list {
    display: grid;
    gap: var(--spacing-lg);
}

.session-card {
    display: flex;
    gap: var(--spacing-md);
    background: var(--gradient-card);
    backdrop-filter: blur(10px);
    padding: var(--spacing-lg);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    border: 1px solid rgba(255, 255, 255, 0.3);
    position: relative;
    overflow: hidden;
}

.session-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    transition: left var(--transition-slow);
}

.session-card:hover::before {
    left: 100%;
}

.session-card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-6px) scale(1.01);
    border-color: var(--primary-light);
}

.card-time {
    flex-shrink: 0;
    text-align: center;
    padding: var(--spacing-md);
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    min-width: 85px;
    box-shadow: var(--shadow-glow);
}

.card-time .time {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-extrabold);
    color: white;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.card-time .date {
    font-size: var(--font-size-xs);
    color: rgba(255, 255, 255, 0.9);
    margin-top: var(--spacing-xs);
    font-weight: var(--font-weight-medium);
}

.card-content {
    flex: 1;
}

.card-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.card-address {
    font-size: var(--font-size-md);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.card-address::before {
    content: '📍';
}

.card-tags {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.distance {
    display: inline-block;
    margin-top: var(--spacing-xs);
    font-size: var(--font-size-xs);
    color: var(--primary-color);
    font-weight: var(--font-weight-medium);
}

.card-slots {
    display: flex;
    gap: var(--spacing-xs);
    align-items: center;
}

.slot-icon {
    font-size: 24px;
    opacity: 0.3;
    transition: var(--transition-fast);
}

.slot-icon.slot-available {
    opacity: 1;
}

/* Tags */
.tag {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    transition: var(--transition-fast);
}

.tag:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.tag-level {
    background: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 100%);
    color: #1565c0;
    border: 1px solid #90caf9;
}

.tag-genre {
    background: linear-gradient(135deg, #f3e5f5 0%, #e1bee7 100%);
    color: #6a1b9a;
    border: 1px solid #ce93d8;
}

/* Slot Item (Detail Page) */
.slots-list {
    display: grid;
    gap: var(--spacing-md);
}

.slot-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
}

.slot-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.slot-info .slot-icon {
    font-size: 32px;
}

.slot-name {
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-md);
}

.slot-count {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.slot-full {
    color: var(--danger-color);
    font-weight: var(--font-weight-medium);
}

/* Buttons */
.btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-medium);
    transition: all 0.2s ease;
    border: none;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:active::before {
    width: 300px;
    height: 300px;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, #2980b9 100%);
    color: white;
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.3);
}

.btn-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, #2980b9 0%, var(--primary-dark) 100%);
    box-shadow: 0 6px 16px rgba(52, 152, 219, 0.4);
    transform: translateY(-2px);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--border-color);
}

.btn-participate {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-sm);
}

/* ========================================
   Loading & Error States
   ======================================== */

/* Loading State */
.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
    text-align: center;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--bg-tertiary);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-md);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-state p {
    color: var(--text-secondary);
    font-size: var(--font-size-md);
    margin-top: var(--spacing-sm);
}

/* Empty State */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 80px 20px;
    text-align: center;
}

.empty-state-icon {
    font-size: 64px;
    margin-bottom: var(--spacing-md);
    opacity: 0.3;
}

.empty-state h3 {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.empty-state p {
    color: var(--text-secondary);
    font-size: var(--font-size-md);
    max-width: 400px;
}

/* Error State */
.error-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
    text-align: center;
    background: #fff3cd;
    border: 1px solid #ffc107;
    border-radius: var(--radius-lg);
    margin: var(--spacing-lg) 0;
}

.error-state-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-md);
    color: #ff9800;
}

.error-state h3 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: #856404;
    margin-bottom: var(--spacing-sm);
}

.error-state p {
    color: #856404;
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-md);
}

.error-state .btn {
    margin-top: var(--spacing-sm);
}

/* Fade In Animation */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.session-card {
    animation: fadeIn 0.5s ease;
}

.session-card:nth-child(1) { animation-delay: 0.1s; }
.session-card:nth-child(2) { animation-delay: 0.2s; }
.session-card:nth-child(3) { animation-delay: 0.3s; }
.session-card:nth-child(4) { animation-delay: 0.4s; }
.session-card:nth-child(5) { animation-delay: 0.5s; }