/* ============================================
   SIDEBAR COMPONENT - VERSION CORRIGÉE
   ============================================ */

.sidebar {
    width: var(--sidebar-width);
    height: 100%;
    background: var(--bg-primary);
    border-right: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* ==========================================
   SIDEBAR HEADER
   ========================================== */

.sidebar-header {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.sidebar-title {
    font-family: var(--font-display);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-new-notebook {
    padding: var(--spacing-sm) var(--spacing-md);
    background: linear-gradient(135deg, var(--color-cyan), var(--color-magenta));
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-family: var(--font-body);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    transition: all var(--transition-base);
}

.btn-new-notebook:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-glow-magenta);
}

.btn-new-notebook:active {
    transform: translateY(0);
}

/* ==========================================
   SIDEBAR SEARCH
   ========================================== */

.sidebar-search {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-light);
}

.search-input {
    width: 100%;
    padding: 10px 12px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: var(--font-size-base);
    transition: all var(--transition-base);
}

.search-input:focus {
    border-color: var(--color-cyan);
    box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.1);
}

.search-input::placeholder {
    color: var(--text-muted);
}

/* ==========================================
   NOTEBOOKS LIST
   ========================================== */

.notebooks-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-sm);
}

/* ==========================================
   NOTEBOOK ITEM
   ========================================== */

.notebook-item {
    padding: 12px 14px;
    margin-bottom: 4px;
    background-color: transparent;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
}

.notebook-item:hover {
    background-color: var(--bg-secondary);
    border-color: var(--border-light);
}

.notebook-item.active {
    background-color: var(--bg-secondary);
    border-color: var(--color-magenta);
    box-shadow: 0 2px 8px rgba(217, 70, 239, 0.15);
}

.notebook-item-title {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    color: var(--text-primary);
    margin-bottom: 4px;
}

.notebook-item.active .notebook-item-title {
    color: var(--color-magenta);
    font-weight: var(--font-weight-semibold);
}

.notebook-item-meta {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    display: flex;
    gap: 12px;
}

/* ==========================================
   EMPTY STATE
   ========================================== */

.notebooks-empty {
    text-align: center;
    padding: var(--spacing-2xl) var(--spacing-lg);
    color: var(--text-muted);
}

.notebooks-empty-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-md);
    opacity: 0.3;
}

.notebooks-empty-text {
    font-size: var(--font-size-sm);
}

/* ==========================================
   RESPONSIVE
   ========================================== */

@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        max-width: 280px;
        position: fixed;
        left: 0;
        top: var(--header-height);
        bottom: 0;
        transform: translateX(-100%);
        transition: transform var(--transition-slow);
        z-index: var(--z-dropdown);
        box-shadow: var(--shadow-lg);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
}