/* modules/panel.css
 * Phase 5: Panel/tab system migrated from components/shared/panel.css
 * Panel kept modular due to size; generic card/table/form styles remain in components-core.css.
 */
.panel {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    width: 100%;
    min-width: 0;
}

.panel__tabs {
    display: flex;
    background: var(--color-gray-50);
    border-bottom: 1px solid var(--color-border);
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
    justify-content: stretch;
}

.panel__tabs::-webkit-scrollbar {
    display: none;
}

.panel__tab {
    flex: 1;
    min-width: 0;
    padding: var(--spacing-md) var(--spacing-lg);
    background: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: color .2s ease, background-color .2s ease, border-color .2s ease;
    white-space: nowrap;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow: hidden;
    text-overflow: ellipsis;
}

.panel__tab::after {
    content: attr(data-text);
    font-weight: 600;
    height: 0;
    visibility: hidden;
    overflow: hidden;
    user-select: none;
    pointer-events: none;
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    padding: var(--spacing-md) var(--spacing-lg);
}

.panel__tab:hover {
    background: var(--color-surface-hover);
    color: var(--color-text);
}

.panel__tab--active {
    background: var(--color-surface);
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
    font-weight: 600;
}

.panel__tab:focus {
    outline: none;
    box-shadow: inset 0 0 0 2px rgba(59, 130, 246, 0.2);
}

.panel__content {
    position: relative;
    min-height: 200px;
    width: 100%;
    overflow: hidden;
}

.panel__pane {
    display: none;
    padding: var(--spacing-md);
    animation: fadeIn .2s ease-in-out;
    width: 100%;
    box-sizing: border-box;
    overflow-x: hidden;
    word-wrap: break-word;
}

.panel__pane--active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.panel-empty {
    padding: var(--spacing-xl);
    text-align: center;
    color: var(--color-text-muted);
    font-style: italic;
}

@media (max-width:768px) {
    .panel__tab {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: var(--font-size-xs);
    }

    .panel__pane {
        padding: var(--spacing-md);
    }
}

@container (max-width:400px) {
    .panel__tabs {
        justify-content: flex-start;
        overflow-x: auto;
    }

    .panel__tab {
        flex: none;
        min-width: fit-content;
    }
}

@media (max-width:400px) {
    .panel__tabs {
        justify-content: flex-start;
        overflow-x: auto;
    }

    .panel__tab {
        flex: none;
        min-width: fit-content;
    }
}

.panel .panel {
    margin-top: var(--spacing-md);
}

.panel .panel .panel__tabs {
    background: var(--color-gray-100);
}

.panel .panel .panel__tab {
    font-size: var(--font-size-xs);
    padding: var(--spacing-sm) var(--spacing-md);
}

/* Card integration */
.card .panel {
    border: none;
    box-shadow: none;
    border-radius: 0;
}

.card .panel__tabs {
    background: var(--color-gray-50);
    border-bottom: 1px solid var(--color-border);
    margin: calc(-1 * var(--spacing-lg)) calc(-1 * var(--spacing-lg)) 0;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.card .panel__pane {
    padding: var(--spacing-md) 0 0 0;
}

/* Strategy builder context */
.builder__sidebar .panel {
    border: none;
    box-shadow: none;
    border-radius: var(--radius-md);
    height: 100%;
    display: flex;
    flex-direction: column;
}

.builder__sidebar .panel__tabs {
    background: var(--color-gray-50);
    border-bottom: 1px solid var(--color-border);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    margin: 0;
}

.builder__sidebar .panel__content {
    flex: 1;
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.builder__sidebar .panel__pane {
    padding: var(--spacing-md);
    height: 100%;
    box-sizing: border-box;
}

.panel__tab .badge {
    margin-left: var(--spacing-xs);
    font-size: var(--font-size-xs);
}

.panel__tab .icon {
    margin-right: var(--spacing-xs);
    font-size: var(--font-size-sm);
}

.panel__pane--loading {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 200px;
    color: var(--color-text-muted);
}