.toast {
    position: fixed;
    left: 50%;
    bottom: 24px;
    transform: translate(-50%, 100%);
    background: #111827;
    color: white;
    padding: 12px 20px;
    border-radius: 5px;
    transition: transform 0.3s ease, opacity 0.3s ease;
    opacity: 0;
    z-index: 1000;
    box-shadow: 0 10px 25px rgba(15, 23, 42, 0.25);
    pointer-events: none;
}

.toast.show {
    transform: translate(-50%, 0);
    opacity: 1;
}

#sidebar-left .sidebar-link {
    display: block;
    padding: 10px 5px;
    border-radius: 8px;
    color: #e5e7eb;
    transition: background-color 0.2s ease, color 0.2s ease;
}

#sidebar-left .sidebar-link:hover {
    color: #34d399;
}

#sidebar-left .sidebar-link.sidebar-link-active {
    background: rgba(59, 130, 246, 0.18);
    color: #93c5fd;
}

#sidebar-left .sidebar-link.sidebar-link-active span {
    color: inherit;
}

#current-time-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.35rem;
}

#current-date {
    font-size: 0.75rem;
    letter-spacing: 0.32em;
    text-transform: uppercase;
    color: #9ca3af;
}

#current-time {
    font-size: 1.875rem;
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.12em;
}

.lang-select-mobile {
    min-width: 140px;
    max-width: 180px;
    background: white;
    border: 1px solid #d1d5db;
    border-radius: 9999px;
    padding: 0.4rem 1rem;
    font-size: 0.85rem;
    color: #1f2937;
    line-height: 1.25rem;
    appearance: none;
    background-image: linear-gradient(45deg, transparent 50%, #6b7280 50%), linear-gradient(135deg, #6b7280 50%, transparent 50%);
    background-position: calc(100% - 18px) calc(1rem - 2px), calc(100% - 12px) calc(1rem - 2px);
    background-size: 6px 6px, 6px 6px;
    background-repeat: no-repeat;
    padding-right: 2rem;
    transition: box-shadow 0.2s ease, border 0.2s ease;
}

.lang-select-mobile:focus {
    outline: none;
    border-color: #3b82f6;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.25);
}

.lang-select-mobile::-ms-expand {
    display: none;
}

.sidebar-slide-enter {
    transform: translateX(-16px);
    opacity: 0;
}

.sidebar-slide-enter-active {
    transform: translateX(0);
    opacity: 1;
    transition: transform 0.2s ease-out, opacity 0.2s ease-out;
}

.sidebar-slide-exit {
    transform: translateX(0);
    opacity: 1;
}

.sidebar-slide-exit-active {
    transform: translateX(-16px);
    opacity: 0;
    transition: transform 0.15s ease-in, opacity 0.15s ease-in;
}

.case-action-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: 0.75rem 1rem;
    border-radius: 0.75rem;
    font-size: 0.9rem;
    font-weight: 600;
    color: #f9fafb;
    background: linear-gradient(135deg, #2563eb, #3b82f6);
    box-shadow: 0 6px 16px rgba(37, 99, 235, 0.2);
    transition: transform 0.18s ease, box-shadow 0.18s ease, filter 0.18s ease;
}

.case-action-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 10px 20px rgba(37, 99, 235, 0.25);
    filter: brightness(1.02);
}

.case-action-btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.35);
}

.case-action-secondary {
    background: linear-gradient(135deg, #6366f1, #818cf8);
    box-shadow: 0 6px 16px rgba(99, 102, 241, 0.2);
}

.case-action-danger {
    background: linear-gradient(135deg, #ef4444, #f87171);
    box-shadow: 0 6px 16px rgba(239, 68, 68, 0.22);
}

.case-input-area {
    padding-bottom: 2.75rem;
}

.case-input-counter {
    position: absolute;
    right: 18px;
    bottom: 14px;
    font-size: 0.75rem;
    font-weight: 600;
    color: #6b7280;
    background: rgba(255, 255, 255, 0.88);
    border-radius: 9999px;
    padding: 0.25rem 0.7rem;
    pointer-events: none;
}

.case-input-area:focus + .case-input-counter,
.case-input-area:focus-visible + .case-input-counter {
    color: #2563eb;
}

.symbol-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(40px, 1fr));
    gap: 8px;
}

.symbol-btn {
    width: 40px;
    height: 40px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: white;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.symbol-btn:hover {
    background: #f3f4f6;
    border-color: #d1d5db;
    transform: scale(1.05);
}

.symbol-btn:active {
    transform: scale(0.95);
}

/* 分类导航样式 */
[id$='-arrow'] {
    transition: transform 0.3s ease;
}

[id$='-arrow'].rotate-180 {
    transform: rotate(180deg);
}

.category-submenu {
    overflow: hidden;
    transition: max-height 0.3s ease-in-out, opacity 0.3s ease-in-out;
    max-height: 0;
    opacity: 0;
}

.category-submenu.expanded {
    opacity: 1;
}

.category-submenu.collapsed {
    opacity: 0;
    pointer-events: none;
}