* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-size: var(--text-base);
    overflow: hidden;
    height: 100vh;
    width: 100vw;
}

#app {
    display: flex;
    height: 100%;
    width: 100%;
}

/* Scrollbar Styles */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

.hidden {
    display: none !important;
}

/* SVG Global Constraint */
svg {
    width: 1em;
    height: 1em;
    vertical-align: middle;
    flex-shrink: 0;
}

/* Specific Icon Classes */
.icon {
    width: 20px;
    height: 20px;
}

.icon-sm {
    width: 16px;
    height: 16px;
}

.icon-lg {
    width: 24px;
    height: 24px;
}

/* Buttons (global for header and modals) */
.btn {
    padding: 6px 12px;
    border-radius: 4px;
    border: none;
    cursor: pointer;
    font-size: var(--text-sm);
    transition: background-color 0.2s, border-color 0.2s;
}

.btn-sm {
    padding: 4px 8px;
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-outline:hover {
    background: var(--bg-secondary);
}

.btn-primary {
    background-color: var(--accent-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--accent-hover);
}

.btn-danger {
    background-color: var(--status-offline);
    color: white;
}

/* Modal (global for dialogs appended to body) */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-content {
    background: var(--bg-primary);
    width: 400px;
    max-width: 90vw;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.modal-header {
    padding: 15px 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h4 {
    margin: 0;
    font-size: var(--text-base);
    color: var(--text-primary);
}

.modal-body {
    padding: 20px;
}

.modal-footer {
    padding: 15px 20px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-size: var(--text-sm);
    color: var(--text-secondary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    box-sizing: border-box;
}

.form-group textarea {
    height: 80px;
    resize: none;
}

.close-modal {
    cursor: pointer;
    font-size: var(--text-2xl);
    color: var(--text-secondary);
    background: none;
    border: none;
    padding: 0;
    line-height: 1;
}

.close-modal:hover {
    color: var(--text-primary);
}