.doc-layout {
    display: grid;
    grid-template-areas:
        "header header"
        "sidebar content";
    grid-template-columns: var(--doc-sidebar-width) 1fr;
    grid-template-rows: var(--doc-header-height) 1fr;
    min-height: 100vh;
}

.doc-header {
    grid-area: header;
    position: sticky;
    top: 0;
    z-index: var(--doc-z-header);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--doc-header-height);
    padding: 0 var(--doc-spacing-lg);
    background: var(--doc-bg-header);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--doc-border-primary);
}

.doc-header__left {
    display: flex;
    align-items: center;
    gap: var(--doc-spacing-md);
    min-width: 0;
}

.doc-header__menu-btn {
    display: none;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--doc-radius-md);
    transition: background var(--doc-transition-fast);
}

.doc-header__menu-btn:hover {
    background: var(--doc-bg-hover);
}

.hamburger {
    display: block;
    width: 18px;
    height: 2px;
    background: var(--doc-text-primary);
    position: relative;
    transition: background var(--doc-transition-fast);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--doc-text-primary);
    transition: transform var(--doc-transition-normal);
}

.hamburger::before {
    top: -6px;
}

.hamburger::after {
    bottom: -6px;
}

.doc-header__menu-btn.active .hamburger {
    background: transparent;
}

.doc-header__menu-btn.active .hamburger::before {
    transform: rotate(45deg) translate(4px, 4px);
}

.doc-header__menu-btn.active .hamburger::after {
    transform: rotate(-45deg) translate(4px, -4px);
}

.doc-header__brand {
    display: flex;
    align-items: center;
    gap: var(--doc-spacing-sm);
    text-decoration: none;
    color: var(--doc-text-heading);
    font-weight: 600;
    font-size: var(--doc-font-size-md);
    white-space: nowrap;
}

.doc-header__icon {
    font-size: 1.25rem;
}

.doc-header__badge {
    font-size: var(--doc-font-size-xs);
    font-weight: 500;
    padding: 2px 8px;
    border-radius: var(--doc-radius-full);
    background: var(--doc-bg-badge);
    color: var(--doc-accent-primary);
}

.doc-header__center {
    flex: 1;
    display: flex;
    justify-content: center;
    max-width: 480px;
    margin: 0 var(--doc-spacing-xl);
}

.doc-header__right {
    display: flex;
    align-items: center;
    gap: var(--doc-spacing-sm);
}

.doc-header__theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--doc-radius-md);
    color: var(--doc-text-secondary);
    transition: all var(--doc-transition-fast);
}

.doc-header__theme-toggle:hover {
    background: var(--doc-bg-hover);
    color: var(--doc-text-primary);
}

[data-theme="light"] .icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: none; }

.doc-header__github {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--doc-radius-md);
    color: var(--doc-text-secondary);
    transition: all var(--doc-transition-fast);
}

.doc-header__github:hover {
    background: var(--doc-bg-hover);
    color: var(--doc-text-primary);
}

.doc-sidebar {
    grid-area: sidebar;
    position: sticky;
    top: var(--doc-header-height);
    height: calc(100vh - var(--doc-header-height));
    overflow-y: auto;
    background: var(--doc-bg-sidebar);
    border-right: 1px solid var(--doc-border-primary);
    padding: var(--doc-spacing-lg) 0;
}

.doc-sidebar__nav {
    padding: 0 var(--doc-spacing-md);
}

.doc-sidebar__section {
    margin-bottom: var(--doc-spacing-lg);
}

.doc-sidebar__heading {
    display: block;
    font-size: var(--doc-font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--doc-text-tertiary);
    padding: var(--doc-spacing-sm) var(--doc-spacing-md);
    margin-bottom: var(--doc-spacing-xs);
}

.doc-sidebar__list {
    display: flex;
    flex-direction: column;
    gap: 1px;
}

.doc-sidebar__link {
    display: block;
    padding: var(--doc-spacing-sm) var(--doc-spacing-md);
    font-size: var(--doc-font-size-sm);
    color: var(--doc-text-secondary);
    border-radius: var(--doc-radius-md);
    transition: all var(--doc-transition-fast);
    text-decoration: none;
}

.doc-sidebar__link:hover {
    color: var(--doc-text-primary);
    background: var(--doc-bg-hover);
}

.doc-sidebar__link.active {
    color: var(--doc-accent-primary);
    background: var(--doc-accent-light);
    font-weight: 500;
}

.doc-sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    z-index: var(--doc-z-overlay);
    background: var(--doc-bg-overlay);
    opacity: 0;
    transition: opacity var(--doc-transition-normal);
}

.doc-sidebar-overlay.visible {
    display: block;
    opacity: 1;
}

.doc-content {
    grid-area: content;
    min-height: calc(100vh - var(--doc-header-height));
    padding: var(--doc-spacing-3xl) var(--doc-spacing-3xl) var(--doc-spacing-lg) var(--doc-spacing-3xl);
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

.doc-content__inner {
    max-width: var(--doc-content-max-width);
    margin: 0 auto;
    width: 100%;
    flex: 1 0 auto;
}

.doc-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--doc-spacing-3xl);
    color: var(--doc-text-tertiary);
    gap: var(--doc-spacing-md);
}

.doc-spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--doc-border-primary);
    border-top-color: var(--doc-accent-primary);
    border-radius: 50%;
    animation: doc-spin 0.8s linear infinite;
}

@keyframes doc-spin {
    to { transform: rotate(360deg); }
}

.doc-footer {
    max-width: var(--doc-content-max-width);
    margin: var(--doc-spacing-2xl) auto 0 auto;
    padding-top: var(--doc-spacing-md);
    border-top: 1px solid var(--doc-border-primary);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--doc-spacing-md);
}

.doc-footer__copyright,
.doc-footer__ai {
    font-size: var(--doc-font-size-xs);
    color: var(--doc-text-tertiary);
    margin: 0;
    line-height: var(--doc-line-height-tight);
}

@media (max-width: 640px) {
    .doc-footer {
        flex-direction: column;
        gap: var(--doc-spacing-xs);
        text-align: center;
        margin-top: var(--doc-spacing-xl);
    }
}