/* ==========================================================================
   flow-vision-viewer.css
   Interaktiver Architektur-Viewer fuer das Zero-Friction-SVG.
   Token-First (alle Werte aus tokens.css), Dark-Only Liquid Glass,
   WCAG 2.2 AA (Focus-Indikatoren, prefers-reduced-motion, 44px Touch-Targets).
   ========================================================================== */

/* ---------- Layout-Grid ----------------------------------------------------- */
.zfa-viewer {
    position: relative;
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(280px, 360px);
    grid-template-rows: auto auto;
    grid-template-areas:
        "stage panel"
        "caption caption";
    gap: var(--spacing-lg);
    margin-top: var(--spacing-2xl);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-lg);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(var(--blur-amount)) saturate(var(--blur-saturate));
    -webkit-backdrop-filter: blur(var(--blur-amount)) saturate(var(--blur-saturate));
    box-shadow: var(--glass-shadow);
    isolation: isolate;
}

.zfa-viewer__hint {
    position: absolute;
    inset-inline-start: 1rem;
    inset-block-start: 1rem;
    margin: 0;
    color: var(--text-alpha-70);
    font-size: 0.85rem;
}

/* ---------- Toolbar (schwebend, Glass) ------------------------------------- */
.zfa-toolbar {
    position: absolute;
    inset-block-start: var(--spacing-md);
    inset-inline-end: calc(360px + var(--spacing-lg) + var(--spacing-md));
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 6px;
    border-radius: var(--border-radius-pill);
    background: var(--glass-bg-strong);
    border: 1px solid var(--glass-border-strong);
    backdrop-filter: blur(var(--blur-amount)) saturate(var(--blur-saturate));
    -webkit-backdrop-filter: blur(var(--blur-amount)) saturate(var(--blur-saturate));
    box-shadow: var(--glass-shadow);
    z-index: var(--z-raised);
}

.zfa-btn {
    appearance: none;
    border: 1px solid transparent;
    background: transparent;
    color: var(--text-primary);
    font-family: var(--font-family-ui);
    font-weight: var(--font-weight-bold);
    font-size: 1.1rem;
    line-height: 1;
    min-width: 44px;
    min-height: 44px;
    padding: 0 var(--spacing-sm);
    border-radius: var(--border-radius-pill);
    cursor: pointer;
    transition: var(--transition-fast);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.zfa-btn:hover,
.zfa-btn:focus-visible {
    background: var(--purple-tint-15);
    border-color: var(--purple-tint-35);
    color: var(--purple-hover);
}

.zfa-btn:focus-visible {
    outline: var(--focus-outline);
    outline-offset: 2px;
    box-shadow: var(--focus-ring);
}

.zfa-btn--label {
    font-size: 0.85rem;
    min-width: 56px;
    letter-spacing: 0.05em;
}

.zfa-btn__label {
    font-variant-numeric: tabular-nums;
}

.zfa-btn--divider {
    margin-inline-start: var(--spacing-xs);
    border-inline-start: 1px solid var(--glass-border);
    border-radius: var(--border-radius-pill);
    padding-inline-start: var(--spacing-md);
}

/* ---------- Stage / Canvas -------------------------------------------------- */
.zfa-stage {
    grid-area: stage;
    position: relative;
    overflow: hidden;
    border-radius: var(--border-radius);
    background: var(--bg-secondary);
    aspect-ratio: 1600 / 1080;
    min-height: 360px;
    box-shadow: inset 0 0 0 1px var(--glass-border);
    cursor: grab;
    touch-action: none;
}

.zfa-stage.is-panning {
    cursor: grabbing;
}

.zfa-canvas {
    position: absolute;
    inset: 0;
    transform-origin: 0 0;
    will-change: transform;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.zfa-stage.is-interacting .zfa-canvas {
    transition: none;
}

.zfa-svg,
.zfa-svg-fallback {
    width: 100%;
    height: 100%;
    display: block;
    pointer-events: none; /* Drag laeuft ueber .zfa-stage */
}

/* SVG-Section-Highlight (Inline-Selektoren wirken erst, wenn das SVG
   im selben Dokument lebt — JS spielt das Inline-SVG ein und setzt
   data-zfa-active auf das aktive <g>). */
.zfa-svg[data-zfa-svg] [data-zfa-section] {
    cursor: pointer;
    transition: filter 0.25s cubic-bezier(0.4, 0, 0.2, 1),
                opacity 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.zfa-stage[data-zfa-has-active] [data-zfa-section] {
    opacity: 0.45;
}

.zfa-stage[data-zfa-has-active] [data-zfa-section][data-zfa-active="true"] {
    opacity: 1;
    filter: drop-shadow(0 0 12px rgba(183, 148, 246, 0.85))
            drop-shadow(0 0 24px rgba(183, 148, 246, 0.45));
}

.zfa-section-outline {
    fill: none;
    stroke: var(--purple-primary, #b794f6);
    stroke-width: 2.5;
    stroke-dasharray: 8 6;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.zfa-section-outline.is-visible {
    opacity: 0.95;
    animation: zfa-dash-march 1.8s linear infinite;
}

@keyframes zfa-dash-march {
    to { stroke-dashoffset: -56; }
}

/* ---------- Side-Panel ------------------------------------------------------ */
.zfa-info-panel {
    grid-area: panel;
    position: relative;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    background: var(--surface-2);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    max-height: 100%;
    overflow: hidden;
}

.zfa-info {
    overflow-y: auto;
    padding-inline-end: var(--spacing-xs);
    scrollbar-width: thin;
    scrollbar-color: var(--purple-tint-35) transparent;
}

.zfa-info__badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: var(--border-radius-pill);
    background: var(--purple-tint-15);
    border: 1px solid var(--purple-tint-30);
    color: var(--purple-hover);
    font-family: var(--font-family-ui);
    font-size: 0.72rem;
    font-weight: var(--font-weight-bold);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    margin-bottom: var(--spacing-sm);
}

.zfa-info__title {
    margin: 0 0 var(--spacing-sm);
    font-family: var(--font-family-heading);
    font-size: 1.35rem;
    line-height: var(--line-height-heading);
    color: var(--text-primary);
}

.zfa-info__lead,
.zfa-info__description {
    margin: 0;
    color: var(--text-alpha-80);
    font-size: 0.95rem;
    line-height: 1.65;
}

.zfa-info__legend {
    list-style: none;
    margin: var(--spacing-md) 0 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    color: var(--text-alpha-70);
    font-size: 0.85rem;
}

.zfa-info__legend li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.zfa-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    flex: 0 0 12px;
    background: var(--purple-tint-30);
    border: 1px solid var(--purple-tint-50);
    box-shadow: 0 0 8px var(--purple-tint-30);
}

.zfa-dot--hub {
    background: var(--purple-primary);
    box-shadow: 0 0 14px var(--purple-tint-50);
}

.zfa-dot--row {
    background: var(--purple-medium);
}

.zfa-dot--principle {
    background: var(--purple-light);
}

.zfa-info__unpin {
    align-self: flex-start;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    appearance: none;
    border: 1px solid var(--glass-border-strong);
    background: var(--glass-bg-strong);
    color: var(--text-primary);
    font-family: var(--font-family-ui);
    font-size: 0.85rem;
    padding: 8px 14px;
    border-radius: var(--border-radius-pill);
    cursor: pointer;
    transition: var(--transition-fast);
    min-height: 36px;
}

.zfa-info__unpin:hover,
.zfa-info__unpin:focus-visible {
    background: var(--purple-tint-15);
    color: var(--purple-hover);
}

.zfa-info__unpin:focus-visible {
    outline: var(--focus-outline);
    outline-offset: 2px;
}

/* ---------- Caption --------------------------------------------------------- */
.zfa-caption {
    grid-area: caption;
    text-align: center;
    color: var(--text-alpha-70);
    font-size: 0.9rem;
    font-style: italic;
    margin: 0;
    padding: 0 var(--spacing-md);
}

/* ---------- Fullscreen ----------------------------------------------------- */
.zfa-viewer:fullscreen,
.zfa-viewer.is-fullscreen {
    width: 100vw;
    height: 100vh;
    max-width: none;
    border-radius: 0;
    margin: 0;
    padding: var(--spacing-lg);
    background: var(--bg-primary);
}

.zfa-viewer:fullscreen .zfa-stage,
.zfa-viewer.is-fullscreen .zfa-stage {
    aspect-ratio: auto;
    height: 100%;
}

/* ---------- Responsive ------------------------------------------------------ */
@media (max-width: 1024px) {
    .zfa-viewer {
        grid-template-columns: minmax(0, 1fr);
        grid-template-areas:
            "stage"
            "panel"
            "caption";
    }
    .zfa-toolbar {
        inset-inline-end: var(--spacing-md);
    }
    .zfa-info-panel {
        max-height: 360px;
    }
}

@media (max-width: 768px) {
    .zfa-viewer {
        padding: var(--spacing-sm);
        gap: var(--spacing-md);
    }
    .zfa-toolbar {
        inset-block-start: auto;
        inset-block-end: calc(var(--spacing-md) + 380px);
        inset-inline-start: 50%;
        inset-inline-end: auto;
        transform: translateX(-50%);
    }
    .zfa-info-panel {
        max-height: 300px;
        padding: var(--spacing-md);
    }
    .zfa-info__title {
        font-size: 1.15rem;
    }
}

/* ---------- Reduced Motion -------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
    .zfa-canvas {
        transition: none;
    }
    .zfa-section-outline.is-visible {
        animation: none;
    }
    .zfa-svg[data-zfa-svg] [data-zfa-section] {
        transition: none;
    }
}