.c-sidebar {
    position: 固定;
    position: fixed;
    top: 0;
    left: -320px;
    width: 320px;
    height: 100vh;
    z-index: 2000;
    transition: var(--trans-smooth);
}

.c-sidebar.is-open {
    left: 0;
}

.c-sidebar__overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    opacity: 0;
    visibility: hidden;
    transition: var(--trans-smooth);
    z-index: -1;
}

.is-open .c-sidebar__overlay {
    opacity: 1;
    visibility: visible;
}

.c-sidebar__content {
    width: 100%;
    height: 100%;
    background-color: var(--clr-surface);
    display: flex;
    flex-direction: column;
    box-shadow: 10px 0 30px rgba(0, 0, 0, 0.5);
}

.c-sidebar__header {
    padding: var(--space-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--clr-overlay);
}

.c-sidebar__logo {
    font-size: var(--fs-lg);
    font-weight: 700;
    color: var(--clr-primary);
}

.c-sidebar__close {
    font-size: 2rem;
    color: var(--clr-text-dim);
}

.c-sidebar__nav {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-md) 0;
}

.c-sidebar__list {
    display: flex;
    flex-direction: column;
}

.c-sidebar__label {
    padding: var(--space-md) var(--space-lg);
    color: var(--clr-text-dim);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: 700;
    margin-top: var(--space-sm);
}

.c-sidebar__link {
    display: block;
    padding: var(--space-md) var(--space-lg);
    color: var(--clr-text-base);
    font-weight: 500;
    border-left: 3px solid transparent;
}

.c-sidebar__link:hover,
.c-sidebar__link.is-active {
    background-color: var(--clr-overlay);
    color: var(--clr-primary);
    border-left-color: var(--clr-primary);
}