:root {
    --bg: #0f1115;
    --bg-elevated: #171a21;
    --surface: #161a22;
    --surface-soft: #1b202a;
    --surface-hover: #212735;
    --text-primary: #edf2ff;
    --text-secondary: #a7b2c7;
    --text-muted: #8792a8;
    --stroke: #2b3342;
    --stroke-soft: #242c39;
    --primary: #7c95ff;
    --primary-hover: #93a7ff;
    --accent: #4bd4bf;
    --danger: #ff6a76;
    --success: #47d18c;
    --shadow-soft: 0 24px 56px rgba(0, 0, 0, 0.34);
    --radius-lg: 18px;
    --radius-md: 12px;
    --bg-glow-a: rgba(124, 149, 255, 0.12);
    --bg-glow-b: rgba(75, 212, 191, 0.1);
    --topbar-bg: rgba(13, 16, 22, 0.82);
    --chip-bg: rgba(255, 255, 255, 0.02);
    --hero-glow-a: rgba(75, 212, 191, 0.12);
    --hero-glow-b: rgba(124, 149, 255, 0.16);
    --hero-sheen: rgba(255, 255, 255, 0.02);
    --panel-bg-tint: rgba(255, 255, 255, 0.015);
    --canvas-glow: rgba(124, 149, 255, 0.12);
    --canvas-grad-top: #171b24;
    --canvas-grad-bottom: #141821;
    --soft-control-bg: rgba(255, 255, 255, 0.02);
    --soft-control-bg-hover: rgba(255, 255, 255, 0.06);
    --soft-ghost-hover: rgba(255, 255, 255, 0.03);
    --output-bg: rgba(255, 255, 255, 0.01);
    --nav-active-bg: rgba(124, 149, 255, 0.16);
    --uf-edge: #596886;
    --uf-node-fill: #2a3550;
    --uf-node-stroke: #5f77b5;
    --uf-node-label: #f6f8ff;
    --uf-sub-label: #aeb8ce;
    --uf-node-root-fill: rgba(75, 212, 191, 0.25);
    --uf-node-highlight-fill: rgba(147, 167, 255, 0.35);
    --uf-node-highlight-stroke: #a6b7ff;
}

:root[data-theme="light"] {
    --bg: #edf2fb;
    --bg-elevated: #ffffff;
    --surface: #ffffff;
    --surface-soft: #eff4fb;
    --surface-hover: #e5edf9;
    --text-primary: #1a2438;
    --text-secondary: #4b5b78;
    --text-muted: #687996;
    --stroke: #c7d4e8;
    --stroke-soft: #d6e0ef;
    --primary: #3c63e8;
    --primary-hover: #5477ee;
    --accent: #19b89a;
    --danger: #d84559;
    --success: #1fa76b;
    --shadow-soft: 0 20px 45px rgba(30, 53, 92, 0.15);
    --bg-glow-a: rgba(95, 131, 255, 0.18);
    --bg-glow-b: rgba(45, 190, 164, 0.12);
    --topbar-bg: rgba(244, 248, 255, 0.88);
    --chip-bg: rgba(255, 255, 255, 0.66);
    --hero-glow-a: rgba(45, 190, 164, 0.16);
    --hero-glow-b: rgba(95, 131, 255, 0.2);
    --hero-sheen: rgba(255, 255, 255, 0.6);
    --panel-bg-tint: rgba(255, 255, 255, 0.7);
    --canvas-glow: rgba(95, 131, 255, 0.2);
    --canvas-grad-top: #f3f7ff;
    --canvas-grad-bottom: #e9f0fb;
    --soft-control-bg: rgba(255, 255, 255, 0.8);
    --soft-control-bg-hover: rgba(255, 255, 255, 0.98);
    --soft-ghost-hover: rgba(91, 119, 195, 0.12);
    --output-bg: rgba(255, 255, 255, 0.66);
    --nav-active-bg: rgba(60, 99, 232, 0.14);
    --uf-edge: #88a0c8;
    --uf-node-fill: #dfe9fb;
    --uf-node-stroke: #6f8fc7;
    --uf-node-label: #18243a;
    --uf-sub-label: #5d7197;
    --uf-node-root-fill: rgba(25, 184, 154, 0.26);
    --uf-node-highlight-fill: rgba(84, 119, 238, 0.22);
    --uf-node-highlight-stroke: #6b8ef0;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Inter, "Segoe UI", -apple-system, BlinkMacSystemFont, sans-serif;
    background:
        radial-gradient(circle at 20% -10%, var(--bg-glow-a), transparent 34%),
        radial-gradient(circle at 85% 0%, var(--bg-glow-b), transparent 26%),
        var(--bg);
    color: var(--text-primary);
    line-height: 1.45;
    overflow-x: hidden;
}

#app {
    min-height: 100vh;
    animation: appFadeIn 420ms ease-out;
    display: flex;
    flex-direction: column;
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    flex-wrap: wrap;
    padding: 20px 28px 16px;
    border-bottom: 1px solid var(--stroke-soft);
    background: var(--topbar-bg);
    backdrop-filter: blur(14px);
    position: sticky;
    top: 0;
    z-index: 10;
}

.app-title {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 570;
    letter-spacing: -0.01em;
}

.app-subtitle {
    margin: 4px 0 0;
    color: var(--text-muted);
    font-size: 0.82rem;
}

.chip {
    border: 1px solid var(--stroke);
    border-radius: 999px;
    padding: 6px 12px;
    color: var(--text-secondary);
    font-size: 0.8125rem;
    background: var(--chip-bg);
}

.topbar-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    justify-content: flex-end;
    flex-wrap: wrap;
}

.top-nav {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 6px;
}

.top-nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    border: 1px solid var(--stroke-soft);
    background: var(--soft-control-bg);
    border-radius: 999px;
    padding: 6px 12px;
    font-size: 0.82rem;
    line-height: 1.1;
    transition: all 150ms ease;
}

.top-nav-link:hover {
    color: var(--text-primary);
    background: var(--soft-control-bg-hover);
    border-color: var(--stroke);
}

.top-nav-link-active {
    color: var(--text-primary);
    border-color: var(--primary);
    background: var(--nav-active-bg);
}

.home-page {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: clamp(14px, 2vw, 24px);
    display: grid;
    gap: 14px;
}

.catalog-toolbar {
    padding: 14px;
    display: grid;
    gap: 8px;
}

.catalog-note {
    margin: 0;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.home-hero {
    padding: clamp(18px, 3vw, 32px);
    background:
        radial-gradient(circle at 88% 15%, var(--hero-glow-a), transparent 32%),
        radial-gradient(circle at 16% 0%, var(--hero-glow-b), transparent 34%),
        linear-gradient(180deg, var(--hero-sheen), transparent);
}

.eyebrow {
    margin: 0 0 10px;
    font-size: 0.74rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--accent);
    font-weight: 620;
}

.hero-title {
    margin: 0;
    font-size: clamp(1.3rem, 2.4vw, 2rem);
    letter-spacing: -0.015em;
}

.hero-copy {
    margin: 10px 0 0;
    color: var(--text-secondary);
    max-width: 70ch;
}

.catalog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 14px;
}

.viz-card {
    padding: 16px;
    display: grid;
    gap: 10px;
    align-content: start;
}

.viz-card h3 {
    margin: 0;
    font-size: 1.08rem;
}

.viz-card p {
    margin: 0;
    color: var(--text-secondary);
}

.viz-points {
    margin: 2px 0 4px;
    padding-left: 18px;
    color: var(--text-muted);
    display: grid;
    gap: 5px;
    font-size: 0.9rem;
}

.viz-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: fit-content;
    border-radius: 999px;
    border: 1px solid rgba(71, 209, 140, 0.4);
    color: var(--success);
    background: rgba(71, 209, 140, 0.08);
    padding: 4px 10px;
    font-size: 0.7rem;
    font-weight: 630;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.viz-badge-muted {
    border-color: var(--stroke);
    color: var(--text-muted);
    background: rgba(255, 255, 255, 0.02);
}

.viz-card-disabled {
    opacity: 0.84;
}

.workspace-page {
    flex: 1;
    display: grid;
    align-content: start;
    gap: 10px;
    padding: 8px clamp(10px, 1.2vw, 18px) clamp(10px, 1.2vw, 18px);
}

.workspace-heading {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 6px 4px 0;
}

.workspace-heading h2 {
    margin: 0;
    font-size: 1rem;
    letter-spacing: -0.01em;
}

.workspace-subtitle {
    margin: 2px 0 0;
    color: var(--text-muted);
    font-size: 0.82rem;
}

.back-btn {
    white-space: nowrap;
}

.app-shell {
    width: 100%;
    max-width: none;
    margin: 0;
    padding: clamp(10px, 1.2vw, 18px);
    display: grid;
    grid-template-columns: minmax(0, 3fr) minmax(360px, 1fr);
    gap: clamp(10px, 1vw, 14px);
    min-width: 0;
}

.surface {
    background: var(--surface);
    border: 1px solid var(--stroke-soft);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-soft);
    transition: border-color 180ms ease, background-color 180ms ease, transform 180ms ease;
}

.canvas-surface {
    grid-column: 1;
    min-height: calc(100vh - 130px);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    animation: riseIn 420ms cubic-bezier(0.2, 0.7, 0.2, 1) both;
}

.canvas-container {
    flex: 1;
    min-height: 480px;
    position: relative;
    cursor: grab;
    background:
        radial-gradient(circle at 20% 15%, var(--canvas-glow), transparent 30%),
        linear-gradient(180deg, var(--canvas-grad-top) 0%, var(--canvas-grad-bottom) 100%);
}

.canvas-container.dragging {
    cursor: grabbing;
}

.canvas-container canvas {
    width: 100%;
    height: 100%;
    display: block;
}

.canvas-empty-msg {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    pointer-events: none;
    font-size: 0.92rem;
}

.canvas-toolbar {
    position: absolute;
    top: 12px;
    right: 12px;
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 6px;
    max-width: 230px;
}

.icon-btn {
    width: 34px;
    height: 34px;
    border: 1px solid var(--stroke);
    border-radius: 10px;
    background: var(--soft-control-bg);
    color: var(--text-secondary);
    transition: all 160ms ease, transform 120ms ease;
}

.icon-btn:hover {
    color: var(--text-primary);
    border-color: #3b4558;
    background: var(--soft-control-bg-hover);
    transform: translateY(-1px);
}

.icon-btn:active {
    transform: translateY(0) scale(0.97);
}

.output-bar {
    border-top: 1px solid var(--stroke);
    padding: 12px 16px 13px;
    display: flex;
    gap: 10px;
    align-items: baseline;
    background: var(--output-bg);
}

.output-label {
    color: var(--text-muted);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.output-values {
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    color: var(--primary);
    font-size: 0.9rem;
}

.panel-grid {
    grid-column: 2;
    display: grid;
    gap: clamp(10px, 1vw, 14px);
    align-content: start;
    min-width: 0;
}

.panel {
    padding: 16px;
    display: grid;
    gap: 10px;
    align-content: start;
    background: linear-gradient(180deg, var(--panel-bg-tint), transparent);
    animation: riseIn 500ms cubic-bezier(0.2, 0.7, 0.2, 1) both;
}

.panel-title {
    margin: 0 0 4px;
    font-size: 0.86rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-muted);
    font-weight: 620;
}

.field-label {
    color: var(--text-muted);
    font-size: 0.69rem;
    text-transform: uppercase;
    letter-spacing: 0.09em;
    margin-top: 2px;
}

input,
select {
    border: 1px solid var(--stroke);
    border-radius: var(--radius-md);
    padding: 10px 12px;
    font: inherit;
    color: var(--text-primary);
    background: var(--surface-soft);
    transition: border-color 140ms ease, background-color 140ms ease;
}

input:focus,
select:focus {
    outline: none;
    border-color: #4a5b7f;
    background: var(--surface-hover);
}

.btn-row {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.btn {
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    padding: 9px 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font: inherit;
    font-weight: 540;
    transition: all 160ms ease, transform 120ms ease;
    cursor: pointer;
    text-decoration: none;
}

.btn:disabled {
    opacity: 0.44;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--primary);
    color: #0a0d16;
}

.btn-primary:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

.btn:active:not(:disabled) {
    transform: translateY(0) scale(0.985);
}

.btn-secondary {
    border-color: var(--stroke);
    background: var(--surface-soft);
    color: var(--text-primary);
}

.btn-secondary:hover:not(:disabled) {
    border-color: #3b4659;
    background: var(--surface-hover);
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    border-color: var(--stroke-soft);
}

.btn-ghost:hover:not(:disabled) {
    background: var(--soft-ghost-hover);
}

.btn-accent {
    background: var(--accent);
    color: #08211c;
}

.btn-accent:hover:not(:disabled) {
    filter: brightness(1.03);
    transform: translateY(-1px);
}

.btn-danger {
    background: transparent;
    color: var(--danger);
    border-color: rgba(255, 106, 118, 0.25);
}

.btn-danger:hover:not(:disabled) {
    background: rgba(255, 106, 118, 0.08);
}

.inline-group {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 8px;
}

.triple-group {
    display: grid;
    grid-template-columns: 1fr 1fr auto;
    gap: 8px;
}

.uf-surface {
    grid-column: 1;
    min-height: calc(100vh - 130px);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    animation: riseIn 420ms cubic-bezier(0.2, 0.7, 0.2, 1) both;
}

.uf-graph-wrap {
    flex: 1;
    min-height: clamp(340px, 56vh, 540px);
    position: relative;
    overflow: hidden;
    cursor: grab;
    touch-action: none;
    background:
        radial-gradient(circle at 20% 15%, var(--canvas-glow), transparent 30%),
        linear-gradient(180deg, var(--canvas-grad-top) 0%, var(--canvas-grad-bottom) 100%);
}

.uf-graph-wrap.dragging {
    cursor: grabbing;
}

.uf-graph {
    width: 100%;
    height: 100%;
    display: block;
    user-select: none;
    -webkit-user-select: none;
    touch-action: none;
}

.uf-graph-toolbar {
    max-width: none;
}

.uf-edge {
    stroke: var(--uf-edge);
    stroke-width: 2;
    opacity: 0.7;
}

.uf-edge-highlight {
    stroke: var(--accent);
    stroke-width: 3;
    opacity: 1;
}

.uf-node {
    fill: var(--uf-node-fill);
    stroke: var(--uf-node-stroke);
    stroke-width: 2;
}

.uf-node-root {
    fill: var(--uf-node-root-fill);
    stroke: var(--accent);
}

.uf-node-highlight {
    fill: var(--uf-node-highlight-fill);
    stroke: var(--uf-node-highlight-stroke);
}

.uf-node-label {
    fill: var(--uf-node-label);
    font-size: 12px;
    font-weight: 700;
    text-anchor: middle;
    dominant-baseline: middle;
    pointer-events: none;
}

.uf-sub-label {
    fill: var(--uf-sub-label);
    font-size: 10px;
    text-anchor: middle;
    pointer-events: none;
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

.uf-state-dump {
    margin: 0;
    min-height: 112px;
    border: 1px solid var(--stroke);
    border-radius: var(--radius-md);
    background: var(--surface-soft);
    padding: 10px 12px;
    color: var(--text-secondary);
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 0.82rem;
    line-height: 1.5;
    white-space: pre-wrap;
    overflow: auto;
}

.uf-shell {
    grid-template-columns: minmax(0, 1fr) minmax(300px, 360px);
}

.divider {
    height: 1px;
    background: var(--stroke-soft);
}

.speed-row {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 10px;
}

input[type="range"] {
    accent-color: var(--primary);
}

.status-row {
    grid-column: 1 / -1;
    padding: 12px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
    background: var(--bg-elevated);
    transition: background-color 200ms ease, border-color 200ms ease;
}

.theme-toggle {
    min-width: 106px;
}

.stats {
    display: flex;
    gap: 16px;
    color: var(--text-secondary);
    font-size: 0.92rem;
}

.stats strong {
    color: var(--success);
    font-weight: 620;
}

@keyframes appFadeIn {
    from {
        opacity: 0.55;
    }
    to {
        opacity: 1;
    }
}

@keyframes riseIn {
    from {
        opacity: 0;
        transform: translateY(10px) scale(0.995);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation: none !important;
        transition: none !important;
    }
}

@media (max-width: 1024px) {
    .home-page {
        padding: 12px;
    }

    .app-shell {
        grid-template-columns: 1fr;
        padding: 12px;
    }

    .canvas-surface,
    .panel-grid {
        grid-column: 1;
    }

    .canvas-surface {
        min-height: 520px;
    }

    .uf-surface {
        min-height: 520px;
    }

    .triple-group {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 1250px) {
    .uf-shell {
        grid-template-columns: 1fr;
    }

    .uf-shell .uf-surface,
    .uf-shell .panel-grid {
        grid-column: 1;
    }
}

@media (max-width: 700px) {
    .topbar {
        padding: 14px 12px;
        align-items: flex-start;
    }

    .topbar-actions {
        width: 100%;
        justify-content: flex-start;
        gap: 8px;
    }

    .workspace-heading {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
}