/* Minimal light icon rail — Linear / Notion style */
.kaahs-app-nav {
    width: 56px;
    background: var(--kaahs-canvas, #f7f8fa);
    flex-shrink: 0;
    z-index: 50;
    height: 100%;
    height: 100dvh;
    border-right: none;
    box-shadow: none;
}
.kaahs-app-nav .rail-btn {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.15s ease, background 0.15s ease;
    text-decoration: none;
    border: none;
    cursor: pointer;
    padding: 0;
    background: transparent;
}
.kaahs-app-nav .rail-btn-idle {
    color: #9ca3af;
}
.kaahs-app-nav .rail-btn-idle:hover {
    color: #374151;
    background: rgb(0 0 0 / 0.04);
}
.kaahs-app-nav .rail-btn-active {
    color: #111827;
    background: #ffffff;
    box-shadow: 0 1px 3px rgb(15 23 42 / 0.06), 0 2px 8px rgb(15 23 42 / 0.04);
}
.kaahs-app-nav .rail-btn i {
    line-height: 1;
    color: inherit;
    pointer-events: none;
    font-size: 0.95rem;
}
.kaahs-app-nav > a:first-of-type,
.kaahs-app-nav > a[href*="index"] {
    width: 32px !important;
    height: 32px !important;
    background: #111827 !important;
    border-radius: 10px !important;
    margin-bottom: 1.5rem;
}
.kaahs-app-nav > a:first-of-type i,
.kaahs-app-nav > a[href*="index"] i {
    color: #fff !important;
    font-size: 0.85rem !important;
}
.kaahs-app-nav > a:first-of-type:hover,
.kaahs-app-nav > a[href*="index"]:hover {
    background: #1f2937 !important;
}

html[data-theme="dark"] .kaahs-app-nav {
    background: #0f1115;
}
html[data-theme="dark"] .kaahs-app-nav .rail-btn-idle {
    color: #6b7280;
}
html[data-theme="dark"] .kaahs-app-nav .rail-btn-idle:hover {
    color: #e5e7eb;
    background: rgb(255 255 255 / 0.06);
}
html[data-theme="dark"] .kaahs-app-nav .rail-btn-active {
    color: #f9fafb;
    background: #1e2129;
    box-shadow: 0 1px 3px rgb(0 0 0 / 0.3);
}