/* Loading Spinner */
.loading-spinner {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 9999;
}

.loading-spinner.active {
    display: block;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid var(--background-light);
    border-top: 5px solid var(--accent-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Scroll to Top Button */
.scroll-to-top {
    display: none;
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: var(--primary-color);
    color: var(--light-text);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    text-align: center;
    line-height: 40px;
    cursor: pointer;
    z-index: 1000;
    transition: all var(--transition-speed) ease;
    opacity: 0.7;
}

.scroll-to-top:hover {
    opacity: 1;
    transform: translateY(-3px);
}

.scroll-to-top.visible {
    display: block;
}

/* Dark Mode Toggle */
.dark-mode-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    background: none;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    padding: 8px;
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-speed) ease;
}

.dark-mode-toggle:hover {
    background-color: rgba(0, 0, 0, 0.1);
}

/* Progress Indicator */
.progress-indicator {
    height: 4px;
    background-color: var(--accent-color);
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1001;
    transition: width var(--transition-speed) ease;
}

/* Favorite Button */
.favorite-btn {
    background: none;
    border: none;
    color: #ccc;
    cursor: pointer;
    transition: color var(--transition-speed) ease;
}

.favorite-btn.active {
    color: #ffd700;
}

/* Tags */
.tag {
    display: inline-block;
    padding: 4px 8px;
    margin: 2px;
    background-color: var(--primary-color);
    color: var(--light-text);
    border-radius: var(--border-radius-sm);
    font-size: 0.8em;
}

/* Notes Section */
.notes-section {
    background-color: rgba(255, 255, 255, 0.95);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
    margin-top: var(--spacing-lg);
    box-shadow: var(--box-shadow);
}

.notes-input {
    width: 100%;
    min-height: 100px;
    padding: var(--spacing-sm);
    border: 1px solid #ddd;
    border-radius: var(--border-radius-sm);
    margin-bottom: var(--spacing-sm);
    resize: vertical;
}

/* Toast Notifications */
.toast {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: var(--primary-color);
    color: var(--light-text);
    padding: 12px 24px;
    border-radius: var(--border-radius-md);
    box-shadow: var(--box-shadow);
    opacity: 0;
    transition: opacity var(--transition-speed) ease;
    z-index: 1000;
}

.toast.show {
    opacity: 1;
}