/* Mobile Navigation */
.mobile-nav {
    position: fixed;
    top: 60px;
    left: 0;
    width: 100%;
    height: 0;
    overflow: hidden;
    background-color: var(--bs-body-bg);
    transition: height 0.3s ease;
    z-index: 1040;
}

.mobile-nav.show {
    height: auto;
    max-height: calc(100dvh - 60px);
    border-bottom: 1px solid var(--bs-border-color-translucent);
    overflow: hidden;
}

/* Panels container */
.mobile-nav-panels {
    position: relative;
    width: 200%;
    display: flex;
    transition: transform 0.3s ease;
}

.mobile-nav-panel {
    width: 50%;
    padding: 1rem 0;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, visibility 0.2s ease;
}

.mobile-nav-panel.panel-active {
    opacity: 1;
    visibility: visible;
}

#panelCategory.panel-active ~ #panelRoot,
#panelCategory.panel-active {
    opacity: 1;
    visibility: visible;
}

.mobile-nav-panels:has(#panelCategory.panel-active) {
    transform: translateX(-50%);
}

/* Level 1: Category List */
.nav-category-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.nav-category-list li {
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

[data-bs-theme="dark"] .nav-category-list li {
    border-bottom-color: rgba(255, 255, 255, 0.08);
}

.nav-category-list li:last-child {
    border-bottom: none;
}

.nav-category-btn {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    background: none;
    border: none;
    font-family: 'Work Sans', sans-serif;
    font-size: 1rem;
    font-weight: 500;
    color: var(--bs-body-color);
    cursor: pointer;
    transition: background-color 0.15s ease;
    text-align: left;
}

.nav-category-btn:hover,
.nav-category-btn:focus {
    background-color: rgba(0, 0, 0, 0.03);
    outline: none;
}

[data-bs-theme="dark"] .nav-category-btn:hover,
[data-bs-theme="dark"] .nav-category-btn:focus {
    background-color: rgba(255, 255, 255, 0.05);
}

.nav-chevron {
    color: #999;
    font-size: 0.9rem;
}

/* Level 2: Back Button */
.nav-back-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 1.5rem;
    background: none;
    border: none;
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
    font-family: 'DM Mono', monospace;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #000;
    font-weight: 600;
    cursor: pointer;
    width: 100%;
    text-align: left;
    transition: color 0.15s ease;
}

[data-bs-theme="dark"] .nav-back-btn {
    border-bottom-color: rgba(255, 255, 255, 0.08);
    color: #fff;
}

.nav-back-btn:hover,
.nav-back-btn:focus {
    color: var(--bs-body-color);
    outline: none;
}

.nav-back-btn .nav-chevron {
    font-size: 1rem;
    font-weight: 600;
}

/* Level 2: Tool List */
.nav-tool-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.nav-tool-list li {
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

[data-bs-theme="dark"] .nav-tool-list li {
    border-bottom-color: rgba(255, 255, 255, 0.05);
}

.nav-tool-list li:last-child {
    border-bottom: none;
}

.nav-tool-list a {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.875rem 1.5rem;
    font-family: 'Work Sans', sans-serif;
    font-size: 0.95rem;
    color: var(--bs-body-color);
    text-decoration: none;
    transition: background-color 0.15s ease;
}

.nav-tool-list a::after {
    content: '→';
    color: #999;
}

.nav-tool-list a:hover,
.nav-tool-list a:focus {
    background-color: rgba(0, 0, 0, 0.03);
    outline: none;
}

[data-bs-theme="dark"] .nav-tool-list a:hover,
[data-bs-theme="dark"] .nav-tool-list a:focus {
    background-color: rgba(255, 255, 255, 0.05);
}

/* View All Link */
.nav-view-all {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    margin-top: 0.5rem;
    border-top: 1px solid rgba(0, 0, 0, 0.08);
    font-family: 'DM Mono', monospace;
    font-size: 0.9rem;
    font-weight: 600;
    color: #000;
    text-decoration: none;
    transition: color 0.15s ease;
}

[data-bs-theme="dark"] .nav-view-all {
    border-top-color: rgba(255, 255, 255, 0.08);
    color: #fff;
}

.nav-view-all:hover,
.nav-view-all:focus {
    color: var(--bs-body-color);
}

/* Prevent scrolling when nav is open */
body.nav-open {
    overflow: hidden;
}

/* Navbar toggle button */
#mobileNavToggle {
    border: none;
    background: transparent;
    padding: 0.5rem;
    cursor: pointer;
    z-index: 1051;
}

#mobileNavToggle:focus {
    outline: none;
    box-shadow: none;
}

.navbar-toggler-icon {
    transition: transform 0.3s ease;
}

.show .navbar-toggler-icon {
    transform: rotate(90deg);
}