header {
    height: var(--header-height);
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 100;
    gap: 12px;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo {
    font-size: 1.3rem;
    font-weight: bold;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
}

.menu-button {
    display: flex;
    background: transparent;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    font-size: 24px;
    padding: 0;
    flex-shrink: 0;
    transition: transform 0.15s ease;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

.search-container {
    position: relative;
    flex: 1;
    max-width: 300px;
}

.search-input {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 8px 12px;
    border-radius: 4px;
    width: 100%;
    font-size: 0.9rem;
    padding-left: 32px;
}

.search-icon {
    position: absolute;
    left: 10px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    font-size: 16px;
    pointer-events: none;
}

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

.progress-bar {
    position: fixed;
    top: var(--header-height);
    left: 0;
    height: 2px;
    width: 0%;
    background-color: var(--accent);
    z-index: 99;
    transition: width 0.1s linear;
    opacity: 0;
}

.dyslexia-toggle,
.light-mode-toggle {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    width: 36px;
    height: 36px;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.15s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    flex-shrink: 0;
}

.dyslexia-toggle:hover,
.light-mode-toggle:hover {
    background-color: var(--bg-primary);
    border-color: var(--accent);
    color: var(--accent);
}

.dyslexia-toggle.active,
.light-mode-toggle.active {
    background-color: var(--accent);
    color: var(--accent-text);
    border-color: var(--accent);
}

.content-wrapper {
    display: flex;
    flex: 1;
    margin-top: var(--header-height);
}

.main-content {
    flex: 1;
    padding: 30px;
    margin-left: var(--sidebar-width);
    max-width: calc(100% - var(--sidebar-width));
}

.content-container {
    max-width: 900px;
    margin: 0 auto;
}

.sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    height: calc(100vh - var(--header-height));
    position: fixed;
    top: var(--header-height);
    left: 0;
    transition: transform 0.15s ease;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    font-weight: bold;
    display: none;
}

.sidebar-menu {
    padding: 10px 0;
}

.sidebar.hidden {
    transform: translateX(-100%);
}

.main-content.expanded {
    margin-left: 0;
    max-width: 100%;
}

.menu-category {
    padding: 5px 20px;
    color: var(--text-secondary);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-top: 15px;
}

.menu-item {
    padding: 8px 20px;
    cursor: pointer;
    transition: background-color 0.15s ease;
    font-size: 0.95rem;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
}

.menu-item-date {
    font-size: 0.75rem;
    color: var(--text-secondary);
    opacity: 0.7;
}

.menu-item-title {
    color: var(--text-primary);
}

.menu-item.active {
    border-left: 3px solid var(--accent);
    background-color: var(--bg-tertiary);
    font-weight: 500;
    padding-left: 17px;
}

.menu-item.active .menu-item-title {
    color: var(--accent);
}

.menu-item.active .menu-item-date {
    color: var(--accent);
    opacity: 0.8;
}