/*
 * Panel / Card Component CSS — jsgui3-html
 *
 * Target class: .jsgui-panel
 * Variants: default, card, elevated, flush, well, glass, outline, hero
 * Structure: .jsgui-panel > .jsgui-panel-header + .jsgui-panel-content + .jsgui-panel-footer
 *
 * Reference: docs/control-design-book/05-control-catalogue.md §Panel
 */

/* ── Base ── */
.jsgui-panel {
    position: relative;
    display: flex;
    flex-direction: column;
    background: var(--panel-bg, var(--j-bg-elevated));
    border: 1px solid var(--panel-border, var(--j-border));
    border-radius: var(--panel-radius, var(--j-radius-lg));
    box-shadow: var(--panel-shadow, var(--j-shadow-sm));
    overflow: hidden;
    font-family: var(--j-font-sans);
    color: var(--j-fg);
    transition:
        box-shadow var(--j-duration-normal) var(--j-ease-out),
        transform var(--j-duration-normal) var(--j-ease-out),
        border-color var(--j-duration-fast) var(--j-ease-out);
}

/* ── Header ── */
.jsgui-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--j-space-3);
    padding: var(--panel-header-py, var(--j-space-4)) var(--panel-header-px, var(--j-space-5));
    border-bottom: 1px solid var(--panel-border, var(--j-border));
    background: var(--panel-header-bg, transparent);
    flex-shrink: 0;
}

.jsgui-panel-title {
    font-size: var(--panel-title-size, var(--j-text-base));
    font-weight: var(--j-font-weight-semibold);
    line-height: 1.3;
    color: var(--j-fg);
    margin: 0;
}

/* ── Content ── */
.jsgui-panel-content {
    flex: 1;
    padding: var(--panel-padding, var(--j-space-5));
    overflow: auto;
}

/* ── Footer ── */
.jsgui-panel-footer {
    display: flex;
    align-items: center;
    gap: var(--j-space-3);
    padding: var(--panel-footer-py, var(--j-space-3)) var(--panel-footer-px, var(--j-space-5));
    border-top: 1px solid var(--panel-border, var(--j-border));
    background: var(--panel-footer-bg, transparent);
    flex-shrink: 0;
}

/* ── Collapse toggle ── */
.jsgui-panel .panel-collapse-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    padding: 0;
    border: none;
    border-radius: var(--j-radius-sm);
    background: transparent;
    color: var(--j-fg-muted);
    cursor: pointer;
    font-size: 12px;
    transition:
        background var(--j-duration-fast) var(--j-ease-out),
        transform var(--j-duration-normal) var(--j-ease-out);
}

.jsgui-panel .panel-collapse-toggle:hover {
    background: var(--j-bg-muted);
    color: var(--j-fg);
}

/* ── Collapsed state ── */
.jsgui-panel.collapsed .jsgui-panel-content {
    display: none;
}

.jsgui-panel.collapsed .jsgui-panel-footer {
    display: none;
}

.jsgui-panel.collapsed .panel-collapse-toggle {
    transform: rotate(-90deg);
}

.jsgui-panel.collapsed .jsgui-panel-header {
    border-bottom: none;
}

/* ══════════════════════════════════════════
   Variants
   ══════════════════════════════════════════ */

/* ── Variant: default (already base styling) ── */

/* ── Variant: card ── */
.jsgui-panel[data-variant="card"] {
    --panel-shadow: var(--j-shadow-md);
    --panel-radius: var(--j-radius-lg);
}

.jsgui-panel[data-variant="card"]:hover {
    box-shadow: var(--j-shadow-lg);
    transform: translateY(-2px);
}

/* ── Variant: elevated ── */
.jsgui-panel[data-variant="elevated"] {
    --panel-shadow: var(--j-shadow-lg);
    --panel-border: transparent;
}

.jsgui-panel[data-variant="elevated"]:hover {
    box-shadow: var(--j-shadow-xl);
    transform: translateY(-3px);
}

/* ── Variant: flat ── */
.jsgui-panel[data-variant="flat"] {
    --panel-shadow: none;
    --panel-border: var(--j-border);
    border-radius: var(--j-radius-md);
}

/* ── Variant: flush ── */
.jsgui-panel[data-variant="flush"] {
    --panel-shadow: none;
    --panel-border: transparent;
    --panel-radius: 0;
    --panel-padding: 0;
}

.jsgui-panel[data-variant="flush"] .jsgui-panel-header {
    border-bottom-color: var(--j-border);
}

/* ── Variant: well ── */
.jsgui-panel[data-variant="well"] {
    --panel-bg: var(--j-bg-subtle);
    --panel-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.06);
    --panel-border: var(--j-border);
}

/* ── Variant: outline ── */
.jsgui-panel[data-variant="outline"] {
    --panel-shadow: none;
    --panel-bg: transparent;
    --panel-border: var(--j-border-strong);
}

.jsgui-panel[data-variant="outline"]:hover {
    --panel-border: var(--j-primary);
}

/* ── Variant: hero ── */
.jsgui-panel[data-variant="hero"] {
    --panel-shadow: var(--j-shadow-xl);
    --panel-border: transparent;
    --panel-radius: var(--j-radius-xl);
    --panel-padding: var(--j-space-6);
    background:
        linear-gradient(135deg,
            color-mix(in srgb, var(--j-primary) 6%, var(--j-bg-elevated)),
            var(--j-bg-elevated) 60%);
}

.jsgui-panel[data-variant="hero"] .jsgui-panel-title {
    font-size: var(--j-text-xl);
    font-weight: var(--j-font-weight-bold);
}

/* ══════════════════════════════════════════
   Glass Variant — Glassmorphism
   ══════════════════════════════════════════ */

.jsgui-panel[data-variant="glass"] {
    --panel-border: rgba(255, 255, 255, 0.12);
    --panel-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
    background: rgba(255, 255, 255, 0.06);
    backdrop-filter: blur(16px) saturate(1.4);
    -webkit-backdrop-filter: blur(16px) saturate(1.4);
}

.jsgui-panel[data-variant="glass"] .jsgui-panel-header {
    border-bottom-color: rgba(255, 255, 255, 0.08);
    background: rgba(255, 255, 255, 0.03);
}

.jsgui-panel[data-variant="glass"] .jsgui-panel-footer {
    border-top-color: rgba(255, 255, 255, 0.08);
    background: rgba(255, 255, 255, 0.03);
}

.jsgui-panel[data-variant="glass"]:hover {
    --panel-shadow: 0 12px 40px rgba(0, 0, 0, 0.18);
    --panel-border: rgba(255, 255, 255, 0.18);
}

/* Glass on dark theme */
[data-theme="dark"] .jsgui-panel[data-variant="glass"] {
    background: rgba(255, 255, 255, 0.04);
    --panel-border: rgba(255, 255, 255, 0.08);
    --panel-shadow: 0 8px 32px rgba(0, 0, 0, 0.40);
}

[data-theme="dark"] .jsgui-panel[data-variant="glass"] .jsgui-panel-header {
    background: rgba(255, 255, 255, 0.02);
}

[data-theme="dark"] .jsgui-panel[data-variant="glass"]:hover {
    --panel-shadow: 0 12px 40px rgba(0, 0, 0, 0.55);
    --panel-border: rgba(255, 255, 255, 0.14);
}

/* ══════════════════════════════════════════
   Padding Presets
   ══════════════════════════════════════════ */

.jsgui-panel[data-padding="none"] .jsgui-panel-content {
    padding: 0;
}

.jsgui-panel[data-padding="small"] .jsgui-panel-content {
    padding: var(--j-space-3);
}

.jsgui-panel[data-padding="medium"] .jsgui-panel-content {
    padding: var(--j-space-5);
}

.jsgui-panel[data-padding="large"] .jsgui-panel-content {
    padding: var(--j-space-6);
}

.jsgui-panel[data-padding="xlarge"] .jsgui-panel-content {
    padding: var(--j-space-8);
}

/* ══════════════════════════════════════════
   Interactive: Hoverable
   ══════════════════════════════════════════ */

.jsgui-panel.hoverable {
    cursor: pointer;
}

.jsgui-panel.hoverable:hover {
    box-shadow: var(--j-shadow-lg);
    transform: translateY(-2px);
    border-color: var(--j-primary);
}

.jsgui-panel.hoverable:active {
    transform: translateY(0);
    box-shadow: var(--j-shadow-sm);
}

/* ══════════════════════════════════════════
   Focus (when panel itself is focusable)
   ══════════════════════════════════════════ */

.jsgui-panel:focus-visible {
    outline: 2px solid var(--j-primary);
    outline-offset: 2px;
}

/* ══════════════════════════════════════════
   Bordered override
   ══════════════════════════════════════════ */

.jsgui-panel.bordered {
    border: 1px solid var(--j-border-strong);
}

/* ══════════════════════════════════════════
   Reduced Motion
   ══════════════════════════════════════════ */

@media (prefers-reduced-motion: reduce) {

    .jsgui-panel,
    .jsgui-panel .panel-collapse-toggle {
        transition: none;
    }

    .jsgui-panel[data-variant="card"]:hover,
    .jsgui-panel[data-variant="elevated"]:hover,
    .jsgui-panel.hoverable:hover {
        transform: none;
    }
}