/* ===================================================================
   sankey.css -- Sankey Diagram Styling
   Glass morphism, dark mode, responsive, accessible
   =================================================================== */

/* ── Page Layout ─────────────────────────────────────────────── */

.sankey-page {
    padding-top: 80px; /* clear fixed nav reliably */
    padding-left: var(--container-padding, var(--space-lg));
    padding-right: var(--container-padding, var(--space-lg));
    padding-bottom: calc(var(--space-2xl) + 80px);
    max-width: 1400px;
    margin: 0 auto;
}

.sankey-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
    flex-wrap: wrap;
}

.sankey-header-left {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.sankey-title {
    font-size: var(--text-title);
    font-weight: var(--font-bold);
    color: var(--text-primary);
}

.sankey-date-label {
    font-size: var(--text-body);
    color: var(--text-secondary);
}

/* ── Month Navigation ────────────────────────────────────────── */

.sankey-month-nav {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.sankey-month-btn {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    border: 1px solid var(--border-light);
    background: var(--glass-bg);
    -webkit-backdrop-filter: blur(var(--glass-blur));
    backdrop-filter: blur(var(--glass-blur));
    color: var(--text-primary);
    font-size: 18px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--duration) var(--ease);
    min-width: 44px;
    min-height: 44px;
}

.sankey-month-btn:hover {
    background: var(--bg-secondary);
    border-color: var(--primary);
    color: var(--primary);
}

/* ── Header Actions ──────────────────────────────────────────── */

.sankey-header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.sankey-export-btn {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    border: 1px solid var(--border-light);
    background: var(--glass-bg);
    -webkit-backdrop-filter: blur(var(--glass-blur));
    backdrop-filter: blur(var(--glass-blur));
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--duration) var(--ease);
    min-width: 44px;
    min-height: 44px;
}

.sankey-export-btn:hover {
    background: var(--bg-secondary);
    border-color: var(--primary);
    color: var(--primary);
}

/* ── Mode Toggle (Monthly / Yearly) ─────────────────────────── */

.sankey-mode-toggle {
    display: flex;
    background: var(--bg-secondary);
    border-radius: var(--radius-full);
    padding: 3px;
    gap: 2px;
    border: 1px solid var(--border-light);
}

.sankey-mode-btn {
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-full);
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: var(--text-caption);
    font-weight: var(--font-medium);
    cursor: pointer;
    transition: all var(--duration) var(--ease);
    min-height: 44px;
    min-width: 80px;
}

.sankey-mode-btn.active {
    background: var(--bg-tertiary);
    color: var(--primary);
    font-weight: var(--font-semibold);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.sankey-mode-btn:hover:not(.active) {
    color: var(--text-primary);
}

/* ── Person Filter Controls ──────────────────────────────────── */

.sankey-filter-controls {
    margin-bottom: var(--space-md);
}

.sankey-filter-row {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.sankey-filter-label {
    font-size: var(--text-caption);
    font-weight: var(--font-semibold);
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.sankey-filter-chips {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.sankey-chip {
    padding: 6px 14px;
    border-radius: var(--radius-full);
    border: 1.5px solid var(--border-light);
    background: transparent;
    color: var(--text-secondary);
    font-size: var(--text-caption);
    font-weight: var(--font-medium);
    cursor: pointer;
    transition: all var(--duration) var(--ease);
    min-height: 36px;
    white-space: nowrap;
}

.sankey-chip:hover {
    background: var(--bg-secondary);
}

.sankey-chip.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    font-weight: var(--font-semibold);
}

.sankey-anon-toggle {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    border: 1px solid var(--border-light);
    background: var(--glass-bg);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    transition: all var(--duration) var(--ease);
    margin-left: auto;
    min-width: 44px;
    min-height: 44px;
}

.sankey-anon-toggle:hover {
    background: var(--bg-secondary);
    border-color: var(--primary);
}

.sankey-anon-toggle.active {
    background: var(--bg-secondary);
    border-color: var(--text-secondary);
}

/* ── Chart Container (no card box — let the diagram breathe) ── */

.sankey-chart-container {
    width: 100%;
    min-height: 440px;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    overflow-x: auto;
    overflow-y: visible;
    -webkit-overflow-scrolling: touch;
}

.sankey-svg {
    display: block;
    height: auto;
    max-width: 100%;
}

/* ── SVG Styles ──────────────────────────────────────────────── */

.sankey-flow {
    opacity: 0.55;
    transition: opacity var(--duration) var(--ease);
    cursor: pointer;
}

.sankey-hover-active .sankey-flow {
    opacity: 0.15;
}

.sankey-flow-highlight {
    opacity: 0.75 !important;
}

.sankey-flow-dim {
    opacity: 0.08 !important;
}

.sankey-node rect {
    transition: opacity var(--duration) var(--ease);
    cursor: pointer;
}

.sankey-node-active rect {
    stroke: var(--text-primary);
    stroke-width: 2;
}

.sankey-label {
    font-size: 12px;
    font-weight: 600;
    fill: var(--text-primary);
    pointer-events: none;
}

.sankey-amount {
    font-size: 10.5px;
    font-weight: 500;
    fill: var(--text-secondary);
    pointer-events: none;
}

.sankey-tooltip-label {
    font-size: var(--text-caption);
    color: var(--text-secondary);
    margin-bottom: 2px;
}

/* ── Type Group Bands ────────────────────────────────────────── */

.sankey-band {
    pointer-events: none;
}

/* ── Entrance Animation ──────────────────────────────────────── */

.sankey-animate-in .sankey-flow {
    animation: sankeyFlowIn 0.8s var(--ease) both;
}

.sankey-animate-in .sankey-node {
    animation: sankeyNodeIn 0.5s var(--ease) both;
}

.sankey-animate-in .sankey-node:nth-child(1) { animation-delay: 0.05s; }
.sankey-animate-in .sankey-node:nth-child(2) { animation-delay: 0.1s; }
.sankey-animate-in .sankey-node:nth-child(3) { animation-delay: 0.15s; }
.sankey-animate-in .sankey-node:nth-child(4) { animation-delay: 0.2s; }
.sankey-animate-in .sankey-node:nth-child(5) { animation-delay: 0.25s; }
.sankey-animate-in .sankey-node:nth-child(6) { animation-delay: 0.3s; }
.sankey-animate-in .sankey-node:nth-child(7) { animation-delay: 0.35s; }
.sankey-animate-in .sankey-node:nth-child(8) { animation-delay: 0.4s; }
.sankey-animate-in .sankey-node:nth-child(9) { animation-delay: 0.45s; }
.sankey-animate-in .sankey-node:nth-child(10) { animation-delay: 0.5s; }
.sankey-animate-in .sankey-node:nth-child(n+11) { animation-delay: 0.55s; }

.sankey-animate-in .sankey-flow:nth-child(1) { animation-delay: 0.2s; }
.sankey-animate-in .sankey-flow:nth-child(2) { animation-delay: 0.3s; }
.sankey-animate-in .sankey-flow:nth-child(3) { animation-delay: 0.35s; }
.sankey-animate-in .sankey-flow:nth-child(4) { animation-delay: 0.4s; }
.sankey-animate-in .sankey-flow:nth-child(5) { animation-delay: 0.45s; }
.sankey-animate-in .sankey-flow:nth-child(6) { animation-delay: 0.5s; }
.sankey-animate-in .sankey-flow:nth-child(7) { animation-delay: 0.55s; }
.sankey-animate-in .sankey-flow:nth-child(8) { animation-delay: 0.6s; }
.sankey-animate-in .sankey-flow:nth-child(9) { animation-delay: 0.65s; }
.sankey-animate-in .sankey-flow:nth-child(10) { animation-delay: 0.7s; }
.sankey-animate-in .sankey-flow:nth-child(n+11) { animation-delay: 0.75s; }

@keyframes sankeyFlowIn {
    from { opacity: 0; }
    to { opacity: 0.55; }
}

@keyframes sankeyNodeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ── Tooltip ─────────────────────────────────────────────────── */

.sankey-tooltip {
    position: fixed;
    display: none;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-md);
    font-size: var(--text-caption);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
    border: 1px solid var(--glass-border);
    pointer-events: none;
    z-index: 9999;
    white-space: nowrap;
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
}

/* ── Empty State ─────────────────────────────────────────────── */

.sankey-empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-2xl);
    text-align: center;
    min-height: 300px;
}

.sankey-empty-icon {
    font-size: 48px;
    margin-bottom: var(--space-md);
    opacity: 0.5;
}

.sankey-empty-title {
    font-size: var(--text-subheading);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

.sankey-empty-desc {
    font-size: var(--text-body);
    color: var(--text-secondary);
}

/* ── Reduced Motion ──────────────────────────────────────────── */

@media (prefers-reduced-motion: reduce) {
    .sankey-animate-in .sankey-flow,
    .sankey-animate-in .sankey-node {
        animation: none !important;
    }

    .sankey-flow,
    .sankey-node rect {
        transition: none;
    }
}

/* ── Dark Mode ───────────────────────────────────────────────── */

[data-theme="dark"] .sankey-tooltip {
    background: var(--bg-secondary);
    border-color: var(--border-light);
}

[data-theme="dark"] .sankey-flow {
    opacity: 0.45;
}

[data-theme="dark"] .sankey-hover-active .sankey-flow {
    opacity: 0.1;
}

[data-theme="dark"] .sankey-flow-highlight {
    opacity: 0.65 !important;
}

[data-theme="dark"] .sankey-chip {
    border-color: var(--border-light);
    color: var(--text-secondary);
}

[data-theme="dark"] .sankey-anon-toggle {
    border-color: var(--border-light);
}

/* ── Print ───────────────────────────────────────────────────── */

@media print {
    .sankey-flow {
        opacity: 0.4 !important;
    }

    .sankey-mode-toggle,
    .sankey-month-nav,
    .sankey-filter-controls {
        display: none !important;
    }
}

/* ── Responsive ──────────────────────────────────────────────── */

@media (max-width: 768px) {
    .sankey-page {
        padding-top: 72px;
        padding-left: var(--space-md);
        padding-right: var(--space-md);
        padding-bottom: calc(var(--space-xl) + 80px);
    }

    .sankey-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-sm);
    }

    .sankey-header-actions {
        width: 100%;
        justify-content: space-between;
    }

    .sankey-chart-container {
        min-height: 360px;
        overflow-x: auto;
    }

    .sankey-label {
        font-size: 10px;
    }

    .sankey-amount {
        font-size: 9px;
    }

    .sankey-filter-row {
        gap: var(--space-xs);
    }

    .sankey-chip {
        padding: 4px 10px;
        font-size: 12px;
        min-height: 32px;
    }
}

@media (max-width: 480px) {
    .sankey-chart-container {
        min-height: 300px;
    }

    .sankey-title {
        font-size: var(--text-subheading);
    }
}