/* Interactive system-design workbench. All outcomes come from the model;
   flow motion is an optional diagram aid, never a representation of latency. */
.design-lab { --design-blue: #82b8ee; --design-violet: #b49af2; --design-amber: #e4bd76; max-width: 1440px; margin: 0 auto; min-width: 0; }
.design-lab *, .design-lab *::before, .design-lab *::after { box-sizing: border-box; }
.design-lab button { font-size: 12px; }
.design-lab .design-icon { width: 16px; height: 16px; stroke: currentColor; fill: none; stroke-width: 1.65; stroke-linecap: round; stroke-linejoin: round; flex-shrink: 0; }
.design-lab .design-small { color: #9ca19d; font-size: 11px; line-height: 1.8; }
.design-page-heading { display: flex; justify-content: space-between; align-items: flex-start; gap: 24px; margin-bottom: 27px; }
.design-page-heading .eyebrow { font-size: 10px; letter-spacing: .13em; }
.design-page-heading h1 { margin: 10px 0 9px; font-size: 34px; letter-spacing: -.045em; }
.design-page-heading p { color: #aaaeab; font-size: 14px; margin-bottom: 0; }
.design-alpha-label { display: inline-flex; gap: 7px; align-items: center; font-size: 10px; color: #a9b1a3; white-space: nowrap; padding-top: 7px; }
.design-alpha-label > span { width: 5px; height: 5px; background: #a2b490; border-radius: 50%; }

/* Challenge and actions stay separate from the canvas tools. */
.design-challenge-bar { display: flex; gap: 18px; align-items: center; padding: 18px 22px; background: #1c2222; border: 1px solid #3f4241; border-radius: 10px; }
.design-challenge-index { font: 25px/1.2 ui-monospace, SFMono-Regular, Consolas, monospace; color: #d4dbce; letter-spacing: -1px; white-space: nowrap; }
.design-challenge-index > span { display: block; color: #868e82; font-size: 10px; letter-spacing: 0; text-align: right; margin-top: 2px; }
.design-challenge-choice { min-width: 0; flex: 1; max-width: 440px; }
.design-challenge-choice > label { display: block; font-size: 9px; letter-spacing: .12em; font-weight: 600; color: #9ca499; margin-bottom: 5px; }
.design-challenge-choice > select { display: block; width: 100%; min-width: 0; padding: 3px 27px 3px 0; color: #e7eae3; font-size: 16px; font-weight: 550; border: 0; border-radius: 3px; background: transparent; text-overflow: ellipsis; }
.design-challenge-choice > select:focus-visible { outline-offset: 3px; }
.design-challenge-choice option { background: #202928; color: #e7eae3; font-size: 13px; }
.design-challenge-meta { display: flex; align-items: center; gap: 10px; font-size: 10px; color: #a6afa2; white-space: nowrap; }
.design-challenge-meta > span:first-child { border: 1px solid #4b5147; background: #2e312d; color: #bdc8af; padding: 3px 7px; border-radius: 4px; }
.design-primary-actions { display: flex; gap: 9px; margin-left: auto; flex-shrink: 0; }
.design-primary-actions button { min-height: 39px; padding: 9px 13px; font-size: 11px; white-space: nowrap; }
.design-primary-actions .primary { gap: 8px; }
.design-primary-actions .primary .design-icon { width: 14px; height: 14px; }
.design-brief { margin: 17px 2px 23px; max-width: 1000px; }
.design-brief > p { margin: 0 0 8px; font-size: 13px; line-height: 1.8; color: #b5bbb3; }
.design-brief details { color: #abb3a8; font-size: 12px; line-height: 1.8; }
.design-brief summary { color: #c1cab8; cursor: pointer; font-size: 11px; padding: 3px 0; }
.design-brief details p { margin: 12px 0 8px; font-size: 12px; color: #b2bbad; }
.design-brief ul { padding-left: 19px; }
.design-brief li { margin: 8px 0; }

/* Workbench chrome */
.design-workspace { border: 1px solid #394248; border-radius: 11px; background: #171d20; overflow: hidden; min-width: 0; }
.design-controls { display: flex; justify-content: space-between; align-items: center; gap: 16px; padding: 11px 15px; border-bottom: 1px solid #333d42; background: #1c2327; }
.design-view-tabs { display: flex; gap: 3px; align-items: center; padding: 3px; border: 1px solid #363f44; background: #151c20; border-radius: 7px; }
.design-view-tabs > button { min-height: 28px; padding: 5px 10px; background: transparent; border: 1px solid transparent; color: #97a6aa; font-size: 10px; border-radius: 4px; }
.design-view-tabs > button.selected { background: #303a3e; color: #e3e7e4; border-color: #494d4c; }
.design-view-tabs > button:hover:not(:disabled) { color: #e0e5e1; border-color: #5e615f; }
.design-toolbar-tools { display: flex; align-items: center; gap: 7px; }
.design-toolbar-tools > button { min-height: 31px; font-size: 10px; padding: 6px 9px; border-color: #3c484b; background: #242e32; color: #c1c8c6; border-radius: 5px; gap: 6px; }
.design-toolbar-tools > button[aria-pressed="true"] { border-color: #99ab84; color: #dbe4d2; background: #393e37; }
.design-toolbar-tools > button.text-btn { background: transparent; border-color: transparent; margin-left: 4px; color: #a6ada7; }
.design-toolbar-tools .design-icon { width: 14px; height: 14px; }
.design-toolbar-tools .design-redo .design-icon { transform: scaleX(-1); }
.design-toolbar-tools > button:disabled { opacity: .36; }
.design-palette { display: flex; align-items: center; gap: 6px; padding: 12px 15px; overflow-x: auto; border-bottom: 1px solid #343e43; background: #192125; scrollbar-width: thin; scrollbar-color: #4b4e4d transparent; }
.design-palette > span { font-size: 9px; color: #919998; letter-spacing: .12em; margin-right: 4px; flex-shrink: 0; }
.design-palette-item { flex: 0 0 auto; display: inline-flex; align-items: center; gap: 6px; min-height: 31px; padding: 6px 9px; border: 1px solid #3d494b; background: #232e32; color: #c1c9c7; font-size: 10px !important; border-radius: 5px; white-space: nowrap; }
.design-palette-item .design-icon { width: 13px; height: 13px; color: #adb6af; }
.design-palette-item:hover:not(:disabled) { border-color: #8b9682; background: #313633; color: #e4e9df; }
.design-palette-item[data-type="gateway"] .design-icon, .design-palette-item[data-type="server"] .design-icon { color: var(--design-blue); }
.design-palette-item[data-type="load-balancer"] .design-icon { color: var(--design-violet); }
.design-palette-item[data-type="cache"] .design-icon { color: #b6c5a1; }
.design-palette-item[data-type="database"] .design-icon, .design-palette-item[data-type="queue"] .design-icon { color: var(--design-amber); }

/* Board geometry mirrors the engine's 1000 × 560 model coordinates. */
.design-stage { display: grid; grid-template-columns: minmax(0,1fr) 250px; align-items: stretch; min-width: 0; }
.design-stage-main { min-width: 0; background: #141b20; }
.design-canvas-top { display: flex; justify-content: space-between; align-items: center; gap: 15px; padding: 12px 16px; border-bottom: 1px solid #2a373d; color: #899da3; font: 9px/1.5 ui-monospace, SFMono-Regular, Consolas, monospace; }
.design-canvas-top > span:first-child { display: inline-flex; align-items: center; gap: 7px; color: #a8b0ad; letter-spacing: .07em; }
.design-status-dot { display: inline-block; width: 5px; height: 5px; border: 1px solid #728883; border-radius: 50%; }
.design-status-dot.is-live { background: #b9e580; border-color: #b9e580; }
.design-board-viewport { width: 100%; overflow: auto; scrollbar-width: thin; scrollbar-color: #575c5a #182126; overscroll-behavior: contain; }
.design-board { position: relative; width: 100%; min-width: 690px; aspect-ratio: 1000 / 560; background-color: #141c21; background-image: radial-gradient(circle, #4a5b60 .7px, transparent .8px); background-size: 20px 20px; isolation: isolate; }
.design-edges, .design-nodes { position: absolute; inset: 0; width: 100%; height: 100%; }
.design-edges { color: #738b91; pointer-events: none; overflow: visible; }
.design-edge { fill: none; stroke: #5d7882; stroke-width: 1.65; vector-effect: non-scaling-stroke; opacity: .8; }
.design-edge.has-flow { stroke: #8aa8af; opacity: 1; }
.design-flow { fill: none; stroke: #cced9c; stroke-width: 2.2; stroke-dasharray: 3 19; stroke-linecap: round; vector-effect: non-scaling-stroke; animation: design-request-flow 1.7s linear infinite; opacity: .95; }
.design-nodes { pointer-events: none; }
.design-node { --node-accent: #acc4c9; --node-border: #506872; --node-fill: #24343d; position: absolute; width: 14.4%; height: 14.642857%; min-height: 0; border: 1px solid var(--node-border); border-top: 2px solid var(--node-accent); border-radius: 7px; background: var(--node-fill); box-shadow: 0 4px 12px #0004; padding: clamp(4px, .6vw, 8px) clamp(6px, .7vw, 10px); display: flex; flex-direction: column; justify-content: center; align-items: stretch; gap: 1px; color: #edf2ed; text-align: left; pointer-events: auto; touch-action: none; cursor: grab; overflow: hidden; user-select: none; }
.design-node:active { cursor: grabbing; }
.design-node:hover:not(:disabled) { background: var(--node-fill); border-color: var(--node-accent); box-shadow: 0 0 0 2px #a0c3bd18, 0 5px 16px #0005; }
.design-node.selected { border-color: #d8f6a9; box-shadow: 0 0 0 2px #c4f26d44, 0 6px 18px #0005; z-index: 3; }
.design-node.connecting { outline: 2px dashed #d5eeaa; outline-offset: 4px; z-index: 4; }
.design-node:focus-visible { outline: 2px solid #eef9d6; outline-offset: 4px; z-index: 4; }
.design-node-top { display: flex; justify-content: space-between; align-items: center; height: 15px; margin-bottom: 2px; }
.design-node-top .design-icon { width: 14px; height: 14px; color: var(--node-accent); }
.design-dot { display: inline-block; flex-shrink: 0; width: 5px; height: 5px; border-radius: 50%; background: #8ca5a5; }
.design-node.healthy .design-dot, .design-dot.healthy { background: #c5e98b; }
.design-node.warning .design-dot, .design-dot.warning { background: #f1c574; }
.design-node.danger .design-dot, .design-dot.danger { background: #ffab9d; }
.design-node.danger { border-color: #a75b57; color: #f5ddd6; background: #3a282b; }
.design-node.warning { border-color: #a38752; }
.design-node > strong { display: block; min-width: 0; font-size: 12px; font-weight: 550; letter-spacing: -.015em; line-height: 1.3; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; color: inherit; }
.design-node-metric { display: block; font: 9px/1.4 ui-monospace, SFMono-Regular, Consolas, monospace; color: #b5c8c9; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.node-client { --node-accent: #a4c8cc; --node-border: #577178; --node-fill: #26373e; }
.node-cdn { --node-accent: #88c4c9; --node-border: #4b7c83; --node-fill: #223b43; }
.node-gateway { --node-accent: #8dbbe9; --node-border: #497396; --node-fill: #243c51; }
.node-rate-limiter { --node-accent: #d0c879; --node-border: #7c7d4e; --node-fill: #3a3e29; }
.node-load-balancer { --node-accent: #bca3ec; --node-border: #7b689b; --node-fill: #38304d; }
.node-server { --node-accent: #86b7ed; --node-border: #4f7299; --node-fill: #273b52; }
.node-cache { --node-accent: #badc8f; --node-border: #758d57; --node-fill: #34442c; }
.node-database { --node-accent: #e3bd79; --node-border: #90764e; --node-fill: #463c2b; }
.node-queue { --node-accent: #e0b68f; --node-border: #967652; --node-fill: #46382d; }
.node-worker { --node-accent: #a0c7ba; --node-border: #62887b; --node-fill: #2c433e; }
.design-empty-board { position: absolute; inset: 0; display: grid; place-items: center; color: #b8c1bd; font-size: 13px; padding: 40px; text-align: center; }
.design-canvas-footer { display: flex; justify-content: space-between; align-items: center; gap: 14px; padding: 8px 15px; border-top: 1px solid #303c41; background: #182126; color: #8ca19f; font-size: 9px; line-height: 1.7; }
.design-canvas-footer > span { max-width: 580px; }
.design-canvas-footer > span > strong { color: #cdd7c1; }
.design-canvas-footer .text-btn { font-size: 9px; color: #c0c9bc; min-height: 29px; white-space: nowrap; }

/* Inspector */
.design-inspector { min-width: 0; padding: 21px 18px; background: #1b2428; border-left: 1px solid #36444a; overflow: auto; max-height: 660px; scrollbar-width: thin; scrollbar-color: #585c5a transparent; }
.design-inspector-empty { padding: 21px 1px 0; }
.design-inspector-empty > .design-icon { width: 26px; height: 26px; color: #879591; margin-bottom: 19px; }
.design-inspector-empty h3 { font-size: 16px; color: #d7ded6; line-height: 1.45; letter-spacing: -.025em; margin: 0 0 10px; }
.design-inspector-empty > p { font-size: 12px; line-height: 1.8; color: #99a39f; }
.design-inspector-tip { border-top: 1px solid #414643; padding-top: 19px; margin-top: 23px; }
.design-inspector-tip strong { font-size: 11px; font-weight: 550; color: #bac3b3; }
.design-inspector-tip p { font-size: 11px; color: #959f92; line-height: 1.8; margin: 7px 0 0; }
.design-inspector-head { display: flex; align-items: center; gap: 10px; }
.design-type-icon { display: grid; place-items: center; width: 33px; height: 35px; border: 1px solid var(--node-border, #536b62); border-radius: 7px; background: var(--node-fill, #2b3d35); color: var(--node-accent, #a8c98d); }
.design-type-icon .design-icon { width: 19px; height: 19px; }
.design-inspector-head .eyebrow { font-size: 8px; color: #96a198; letter-spacing: .12em; }
.design-inspector-head h3 { font-size: 15px; color: #dde3da; letter-spacing: -.025em; margin: 2px 0 0; }
.design-description { font-size: 11px; color: #a6aea5; line-height: 1.8; margin: 15px 0 18px; }
.design-field { display: block; font-size: 10px; font-weight: 500; color: #bdc5b9; margin: 13px 0; min-width: 0; }
.design-field > input { display: block; width: 100%; margin-top: 6px; min-height: 34px; font-size: 12px; padding: 8px 9px; border-color: #4a504b; border-radius: 5px; background: #191c1b; color: #dbe2d6; }
.design-input-unit { display: flex; align-items: center; background: #191c1b; border: 1px solid #4a504b; border-radius: 5px; margin-top: 6px; }
.design-input-unit > input { width: 100%; min-width: 0; border: 0; background: transparent; min-height: 33px; padding: 7px 8px; font: 12px ui-monospace, SFMono-Regular, Consolas, monospace; color: #dbe2d6; border-radius: 5px 0 0 5px; }
.design-input-unit > span { padding: 0 9px 0 3px; color: #939d90; font-size: 9px; white-space: nowrap; }
.design-failure-switch { display: flex; align-items: center; justify-content: space-between; gap: 11px; margin: 19px 0; padding-top: 16px; border-top: 1px solid #414642; }
.design-failure-switch strong { display: block; font-size: 11px; color: #d4dad0; font-weight: 500; }
.design-failure-switch small { display: block; font-size: 9px; line-height: 1.7; color: #97a195; margin-top: 3px; }
.design-failure-switch input { appearance: none; flex-shrink: 0; position: relative; width: 29px; height: 17px; border-radius: 20px; border: 1px solid #636c60; background: #373b35; margin: 0; padding: 0; cursor: pointer; }
.design-failure-switch input::before { content: ""; position: absolute; left: 2px; top: 2px; width: 11px; height: 11px; border-radius: 50%; background: #bac0b4; }
.design-failure-switch input:checked { background: #854742; border-color: #c58572; }
.design-failure-switch input:checked::before { left: 14px; background: #ffe0c3; }
.design-node-observation { font-size: 11px; background: #243328; border: 1px solid #425c3b; border-radius: 7px; padding: 11px; margin: 16px 0; }
.design-node-observation > strong { font-size: 10px; text-transform: capitalize; font-weight: 500; color: #d4e6c4; margin-left: 5px; }
.design-node-observation > p { font: 10px/1.7 ui-monospace, SFMono-Regular, Consolas, monospace; color: #a3be94; margin: 6px 0 0; }
.design-inspector-connect { margin-top: 20px; }
.design-inspector-connect > label { display: block; color: #bbc6b7; font-size: 10px; margin-bottom: 7px; }
.design-inspector-connect > div { display: flex; gap: 6px; }
.design-inspector-connect select { width: 100%; min-width: 0; font-size: 11px; padding: 8px; min-height: 34px; border-color: #525951; background: #212623; border-radius: 5px; }
.design-inspector-connect button { flex-shrink: 0; min-height: 34px; padding: 7px; border-radius: 5px; background: #343a34; border-color: #545d50; }
.design-inspector-links { margin: 10px 0 14px; }
.design-inspector-links:empty { margin: 0 0 12px; }
.design-inspector-links > div { display: flex; justify-content: space-between; align-items: center; gap: 8px; font-size: 10px; color: #a7b3a2; border-bottom: 1px solid #3d443d; padding: 3px 0; }
.design-inspector-links .text-btn { font-size: 17px; color: #b1bdaa; min-width: 27px; min-height: 27px; justify-content: center; }
.design-inspector > .danger { font-size: 10px; color: #e3ab92; min-height: 31px; }

/* Controls and outcome summaries */
.design-load-controls { display: grid; grid-template-columns: minmax(0,1.25fr) minmax(0,1fr) 145px auto; align-items: center; gap: 25px; padding: 22px; background: #202a2a; border-top: 1px solid #414644; border-bottom: 1px solid #414644; }
.design-load-controls > label { min-width: 0; }
.design-load-controls > label > span { display: flex; justify-content: space-between; align-items: center; gap: 10px; color: #adb5a9; font-size: 11px; margin-bottom: 12px; }
.design-load-controls strong { color: #dee4d8; font: 11px ui-monospace, SFMono-Regular, Consolas, monospace; white-space: nowrap; }
.design-load-controls input[type="range"] { display: block; width: 100%; height: 5px; padding: 0; margin: 0; accent-color: #b4c49d; cursor: pointer; }
.design-window-label { color: #acb6a9; font-size: 10px; }
.design-window-label > select { display: block; width: 100%; font-size: 11px; min-height: 34px; padding: 7px 9px; margin-top: 7px; border-color: #515850; background: #1f2421; }
.design-load-controls > .text-btn { max-width: 100px; color: #b2beab; font-size: 10px; line-height: 1.6; text-align: left; min-height: 34px; }
.design-metrics { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); background: #1b2424; }
.design-metric { padding: 20px 23px; min-width: 0; }
.design-metric + .design-metric { border-left: 1px solid #3a403d; }
.design-metric > span { font-size: 10px; color: #a7b1a4; }
.design-metric > strong { display: flex; align-items: baseline; flex-wrap: wrap; column-gap: 7px; color: #e5eadf; font: 25px/1.3 ui-monospace, SFMono-Regular, Consolas, monospace; letter-spacing: -.8px; margin: 9px 0 6px; font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.design-metric > strong > small { font-size: 10px; letter-spacing: 0; color: #97a393; }
.design-metric > em { font-style: normal; color: #939d90; font-size: 9px; line-height: 1.6; }
.design-good { color: #c9e89e !important; }
.design-warn { color: #efc28e !important; }
.design-feedback { border-top: 1px solid #414643; background: #212423; padding: 18px 22px; }
.design-feedback-idle { display: flex; gap: 15px; align-items: baseline; flex-wrap: wrap; color: #9ba79a; font-size: 11px; }
.design-feedback-idle > strong { color: #c2cdbb; font-size: 12px; font-weight: 500; }
.design-run-label { color: #9bab94; font-size: 9px; letter-spacing: .1em; font-weight: 600; }
.design-run-summary > p { color: #c3cdbc; font-size: 12px; margin: 9px 0 8px; line-height: 1.8; }
.design-latency { color: #93a08e; font-size: 10px; line-height: 1.8; }
.design-warning-list { margin: 14px 0 0; padding: 12px 12px 12px 29px; border: 1px solid #6a6741; border-radius: 6px; background: #2c2c27; color: #d4ca9f; font-size: 11px; line-height: 1.8; }
.design-warning-list li + li { margin-top: 7px; }
.design-feedback-errors > strong { color: #f1bf9e; font-size: 12px; }
.design-feedback-errors > ul { color: #d6b296; font-size: 12px; line-height: 1.8; padding-left: 18px; margin-bottom: 0; }

/* Accessible graph alternative */
.design-table-wrap { width: 100%; overflow-x: auto; padding: 17px; scrollbar-width: thin; }
.design-data-table { width: 100%; border-collapse: collapse; text-align: left; white-space: nowrap; font-size: 11px; color: #bcc6bd; }
.design-data-table caption { text-align: left; padding: 0 0 14px; font-size: 10px; color: #94a197; }
.design-data-table th, .design-data-table td { padding: 11px 12px; border-bottom: 1px solid #3d423f; font-weight: 400; }
.design-data-table thead th { background: #272d2a; color: #c6d1c2; font-size: 10px; }
.design-data-table tbody th { color: #d5ded1; }
.design-data-table tbody th > small { display: block; color: #929f91; font-size: 9px; margin-top: 2px; }
.design-data-table .text-btn { font-size: 10px; color: #bfcdb7; }
.design-connections-list { padding: 3px 23px 22px; }
.design-connections-list h3 { font-size: 14px; color: #c2cfbc; margin: 13px 0; }
.design-connections-list > div { display: flex; gap: 12px; align-items: center; border-bottom: 1px solid #3c443e; padding: 7px 0; color: #b6c2b1; font-size: 11px; }
.design-connections-list > div > span:first-child { flex: 1; }
.design-connections-list > div > span:nth-child(2) { font: 10px ui-monospace, SFMono-Regular, Consolas, monospace; color: #94a38e; white-space: nowrap; }
.design-connections-list .text-btn { color: #c8b69c; font-size: 10px; }
.design-connections-list > p { color: #a2af9f; font-size: 12px; line-height: 1.8; }

/* Learning, requirements, and progress */
.design-bottom-grid { display: grid; grid-template-columns: minmax(0,1.8fr) minmax(0,1fr); gap: 20px; margin-top: 23px; align-items: start; }
.design-learning, .design-checks-panel { padding: 24px; background: #1e201f; border: 1px solid #414541; border-radius: 10px; min-width: 0; }
.design-learning-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; margin-bottom: 22px; flex-wrap: wrap; }
.design-learning-head .eyebrow, .design-checks-title .eyebrow { font-size: 9px; color: #a2aa9b; }
.design-learning h2 { font-size: 21px; line-height: 1.35; letter-spacing: -.035em; margin: 9px 0 0; color: #e4e9e0; }
.design-help-actions { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.design-help-actions > button { font-size: 10px; min-height: 33px; }
.design-help-actions > .ghost { padding: 7px 10px; background: #2d312d; border-color: #50564e; }
.design-help-actions > .text-btn { color: #b5bfab; }
.design-hints { border: 1px solid #5b6256; background: #2b2f29; border-radius: 7px; padding: 14px; margin: 18px 0; }
.design-hints p { font-size: 12px; color: #becbb5; line-height: 1.8; margin: 0; }
.design-hints p + p { margin-top: 12px; }
.design-hints strong { color: #dbe2cc; font-size: 10px; display: block; margin-bottom: 4px; }
.design-walkthrough { border-left: 2px solid #a5b292; padding: 3px 0 5px 16px; margin: 18px 0 23px; }
.design-walkthrough h3 { color: #d6decb; font-size: 16px; margin: 0 0 12px; }
.design-walkthrough h4 { color: #c5cfbb; font-size: 12px; margin: 18px 0 8px; }
.design-walkthrough p { font-size: 12px; color: #b0bda8; line-height: 1.9; }
.design-walkthrough > .ghost { min-height: 34px; font-size: 11px; background: #353a34; border-color: #636b5e; color: #d1dcc5; }
.design-walkthrough .design-small { color: #9eac98; font-size: 10px; margin: 12px 0 0; }
.design-explanation-label { display: block; color: #c4cebc; font-size: 11px; margin: 18px 0 9px; }
#design-notes { width: 100%; min-height: 180px; resize: vertical; background: #181b19; border-color: #474e46; color: #d2ddc8; font-size: 12px; line-height: 1.9; padding: 14px; border-radius: 7px; }
#design-notes::placeholder { color: #7e8c7a; }
.design-notes-footer { display: flex; justify-content: space-between; gap: 10px; align-items: center; flex-wrap: wrap; margin: 11px 0 20px; }
.design-notes-footer > span { color: #8d9a88; font-size: 9px; }
.design-notes-footer > a { display: inline-flex; align-items: center; gap: 7px; color: #b7c6ad; font-size: 10px; }
.design-notes-footer .design-icon { width: 13px; height: 13px; }
.design-assumptions { border-top: 1px solid #424941; padding-top: 16px; margin-top: 18px; color: #afbca8; font-size: 11px; line-height: 1.9; }
.design-assumptions summary { color: #b6c2ab; font-size: 11px; cursor: pointer; }
.design-assumptions p { color: #97a592; font-size: 11px; line-height: 1.9; margin: 13px 0 10px; }
.design-sources { display: flex; flex-direction: column; align-items: flex-start; gap: 6px; margin-top: 15px; }
.design-sources a { color: #b5c4ab; font-size: 10px; text-decoration: underline; text-decoration-color: #5e675a; text-underline-offset: 3px; overflow-wrap: anywhere; }
.design-checks-title h2 { font-size: 19px; color: #dee5d6; margin: 9px 0 10px; }
.design-checks-title p { color: #a1ad9a; font-size: 11px; line-height: 1.8; margin-bottom: 19px; }
.design-checks-empty p { color: #9eab97; font-size: 12px; line-height: 1.9; margin: 0 0 20px; }
.design-check-summary { display: flex; flex-direction: column; gap: 4px; padding: 13px; border: 1px solid #606657; background: #30342d; border-radius: 7px; margin-bottom: 17px; }
.design-check-summary strong { font-size: 12px; color: #d5dcc6; font-weight: 550; }
.design-check-summary span { font: 10px ui-monospace, SFMono-Regular, Consolas, monospace; color: #a8b49b; }
.design-check-summary.needs-work { background: #3b3422; border-color: #806d44; }
.design-check-summary.needs-work strong { color: #ead3a2; }
.design-check-summary.needs-work span { color: #c4b58d; }
.design-check-item { display: flex; gap: 10px; border-top: 1px solid #40473e; padding: 12px 0; min-width: 0; }
.design-check-item > span { font-size: 14px; line-height: 1.5; }
.design-check-item > div { min-width: 0; }
.design-check-item strong { font-size: 11px; font-weight: 500; color: #cad4c2; line-height: 1.7; display: block; }
.design-check-item p { color: #9faf97; font-size: 10px; line-height: 1.8; margin: 5px 0 0; overflow-wrap: anywhere; }
.design-check-item small { color: #97a68e; font-size: 9px; line-height: 1.8; display: block; margin-top: 5px; overflow-wrap: anywhere; }
.design-check-fixture { border-top: 1px solid #40473e; padding: 12px 0; min-width: 0; }
.design-check-fixture > summary { cursor: pointer; font-size: 11px; line-height: 1.7; color: #c9d4c4; font-weight: 500; }
.design-check-fixture > summary > span { margin-right: 4px; }
.design-check-fixture > summary > small { display: inline-block; margin-left: 7px; color: #9dab97; font: 10px ui-monospace, SFMono-Regular, Consolas, monospace; }
.design-check-fixture > .design-check-item { border-top: 0; padding: 11px 0 4px 6px; }
.design-check-fixture[open] > summary { margin-bottom: 5px; }
.design-checks-panel > .primary { font-size: 11px; min-height: 37px; margin-top: 9px; }
.design-checks-panel .design-small { font-size: 10px; color: #95a38c; }
.design-history { border-top: 1px solid #464e43; padding-top: 16px; margin-top: 22px; }
.design-history > summary { cursor: pointer; font-size: 11px; color: #b3c0a7; }
.design-history > summary > span { margin-left: 7px; color: #8d9b84; font-size: 10px; }
.design-history > div { display: grid; grid-template-columns: 1fr auto; gap: 5px 10px; font-size: 9px; color: #8e9c85; border-bottom: 1px solid #3a4138; padding: 11px 0; }
.design-history > div > strong { color: #c4cfb9; font-size: 10px; font-weight: 500; }
.design-history > div > span:last-child { grid-column: 1 / -1; }
.design-backup { display: flex; justify-content: space-between; align-items: center; gap: 24px; border-top: 1px solid #3b423a; padding-top: 23px; margin-top: 27px; }
.design-backup strong { font-size: 12px; color: #bdc9b3; font-weight: 500; }
.design-backup p { color: #8b9883; font-size: 10px; margin: 6px 0 0; line-height: 1.8; }
.design-backup > div:last-child { display: flex; gap: 18px; align-items: center; }
.design-backup button { font-size: 10px; min-height: 35px; }
.design-backup .ghost { background: transparent; border-color: #4f574b; color: #bfcab5; }
.design-backup .text-btn { color: #b1bda6; }
.design-import-confirm { margin-top: 20px; border: 1px solid #8a8553; border-radius: 8px; background: #2f3029; padding: 20px; }
.design-import-confirm > strong { color: #e1e1b6; font-size: 14px; }
.design-import-confirm p { color: #b2b6a4; font-size: 12px; line-height: 1.8; }
.design-import-confirm button { margin-right: 10px; margin-top: 5px; }

@keyframes design-request-flow { to { stroke-dashoffset: -44; } }
@media (max-width: 1300px) {
  .design-stage { grid-template-columns: minmax(0,1fr); }
  .design-inspector { border-left: 0; border-top: 1px solid #424745; max-height: none; padding: 20px 22px; display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); align-items: start; gap: 10px 17px; }
  .design-inspector-empty { grid-column: 1 / -1; padding: 0; display: grid; grid-template-columns: 30px minmax(0,1fr) minmax(0,.85fr); gap: 7px 17px; }
  .design-inspector-empty > .design-icon { grid-column: 1; grid-row: 1 / span 2; margin: 3px 0 0; }
  .design-inspector-empty > h3 { grid-column: 2; margin-bottom: 0; font-size: 15px; }
  .design-inspector-empty > p { grid-column: 2; margin: 0; font-size: 11px; }
  .design-inspector-tip { grid-column: 3; grid-row: 1 / span 2; border-top: 0; border-left: 1px solid #474d45; padding: 0 0 0 21px; margin: 0; }
  .design-inspector-tip p { margin-top: 5px; }
  .design-inspector-head { grid-column: 1 / span 2; }
  .design-description { grid-column: 3 / span 2; margin: 0; font-size: 10px; }
  .design-field { margin: 5px 0; }
  .design-failure-switch { margin: 4px 0; padding-top: 7px; border-top: 0; min-height: 54px; }
  .design-node-observation { margin: 3px 0; min-height: 58px; }
  .design-inspector-connect { margin-top: 5px; }
  .design-inspector-links { margin: 4px 0; }
  .design-inspector > .danger { align-self: end; justify-self: start; }
  .design-challenge-bar { gap: 15px; padding: 17px 19px; }
  .design-challenge-meta { flex-direction: column; gap: 4px; }
  .design-challenge-choice > select { font-size: 15px; }
  .design-metric { padding: 19px 20px; }
  .design-metric > strong { font-size: 24px; }
  .design-learning, .design-checks-panel { padding: 22px; }
  .design-bottom-grid { gap: 18px; grid-template-columns: minmax(0,1.55fr) minmax(0,1fr); }
}
@media (max-width: 1080px) {
  .design-page-heading h1 { font-size: 31px; }
  .design-page-heading p { font-size: 12px; }
  .design-alpha-label { font-size: 9px; }
  .design-challenge-bar { flex-wrap: wrap; gap: 13px; }
  .design-challenge-index { font-size: 23px; }
  .design-challenge-choice { max-width: none; }
  .design-challenge-meta { flex-direction: row; gap: 7px; }
  .design-primary-actions { width: 100%; justify-content: flex-end; border-top: 1px solid #424840; padding-top: 13px; }
  .design-controls { padding: 10px 12px; gap: 9px; }
  .design-view-tabs > button { padding: 5px 8px; font-size: 9px; }
  .design-toolbar-tools { gap: 5px; }
  .design-toolbar-tools > button { padding: 6px 8px; font-size: 9px; }
  .design-toolbar-tools > button.text-btn { margin-left: 0; }
  .design-inspector { grid-template-columns: repeat(3,minmax(0,1fr)); gap: 12px 16px; }
  .design-inspector-head { grid-column: 1; }
  .design-description { grid-column: 2 / span 2; }
  .design-inspector-empty { grid-template-columns: 25px minmax(0,1.2fr) minmax(0,1fr); }
  .design-inspector-empty > h3 { font-size: 14px; }
  .design-load-controls { grid-template-columns: minmax(0,1fr) minmax(0,1fr); gap: 19px 25px; }
  .design-window-label { display: flex; gap: 11px; align-items: center; }
  .design-window-label > select { width: auto; flex: 1; margin-top: 0; }
  .design-load-controls > .text-btn { justify-self: end; max-width: none; }
  .design-metric { padding: 18px 17px; }
  .design-metric > strong { font-size: 22px; }
  .design-bottom-grid { grid-template-columns: 1fr; }
  .design-learning-head { flex-wrap: nowrap; }
  .design-help-actions { flex-shrink: 0; }
  .design-check-list { display: grid; grid-template-columns: 1fr 1fr; column-gap: 22px; align-items: start; }
  .design-checks-panel > .primary { margin-top: 12px; }
}
@media (max-width: 760px) {
  .design-page-heading { display: block; margin-bottom: 23px; }
  .design-page-heading .eyebrow { font-size: 9px; }
  .design-page-heading h1 { font-size: 29px; margin-top: 9px; }
  .design-page-heading p { font-size: 12px; line-height: 1.8; max-width: 390px; }
  .design-alpha-label { padding-top: 12px; font-size: 9px; }
  .design-challenge-bar { border-radius: 8px; padding: 17px; gap: 13px; }
  .design-challenge-index { font-size: 23px; }
  .design-challenge-choice > label { font-size: 8px; }
  .design-challenge-choice > select { font-size: 14px; padding-right: 23px; }
  .design-challenge-meta { gap: 8px; font-size: 9px; }
  .design-challenge-meta > span:first-child { font-size: 8px; padding: 3px 6px; }
  .design-primary-actions { justify-content: stretch; padding-top: 13px; gap: 8px; }
  .design-primary-actions button { flex: 1; min-height: 41px; font-size: 11px; }
  .design-brief { margin: 17px 0 20px; }
  .design-brief > p { font-size: 12px; line-height: 1.9; }
  .design-brief summary { font-size: 11px; padding: 7px 0; }
  .design-brief details p { font-size: 12px; }
  .design-workspace { border-radius: 8px; }
  .design-controls { flex-wrap: wrap; gap: 10px; padding: 11px 12px; }
  .design-view-tabs > button { min-height: 32px; font-size: 10px; padding: 6px 9px; }
  .design-toolbar-tools { margin-left: auto; gap: 6px; }
  .design-toolbar-tools > button { min-height: 34px; padding: 7px 9px; font-size: 10px; }
  .design-palette { gap: 7px; padding: 11px 12px; }
  .design-palette-item { min-height: 35px; padding: 8px 10px; font-size: 10px !important; }
  .design-canvas-top { padding: 11px 12px; font-size: 8px; gap: 10px; }
  .design-canvas-top > span:first-child { letter-spacing: .02em; }
  .design-node { padding: 5px 7px; border-radius: 6px; }
  .design-node-top { height: 13px; margin-bottom: 2px; }
  .design-node-top .design-icon { width: 13px; height: 13px; }
  .design-node > strong { font-size: 11px; }
  .design-node-metric { font-size: 9px; }
  .design-canvas-footer { gap: 13px; padding: 8px 12px; align-items: flex-start; }
  .design-canvas-footer > span { font-size: 9px; line-height: 1.9; padding-top: 5px; }
  .design-canvas-footer .text-btn { font-size: 9px; min-height: 34px; }
  .design-inspector { padding: 18px; gap: 10px 15px; grid-template-columns: repeat(2,minmax(0,1fr)); }
  .design-inspector-head { grid-column: 1 / -1; }
  .design-inspector-head h3 { font-size: 16px; }
  .design-description { grid-column: 1 / -1; font-size: 11px; margin: 2px 0 4px; }
  .design-field { font-size: 10px; }
  .design-field > input { min-height: 40px; font-size: 12px; }
  .design-input-unit > input { min-height: 38px; font-size: 12px; }
  .design-input-unit > span { font-size: 9px; }
  .design-failure-switch { min-height: 63px; }
  .design-node-observation { min-height: 63px; }
  .design-inspector-connect select { min-height: 40px; font-size: 11px; }
  .design-inspector-connect button { min-height: 40px; padding: 10px; }
  .design-inspector-links .text-btn { min-height: 32px; min-width: 32px; }
  .design-inspector > .danger { min-height: 40px; font-size: 11px; }
  .design-inspector-empty { grid-template-columns: 26px minmax(0,1fr); gap: 7px 14px; }
  .design-inspector-empty > .design-icon { width: 23px; height: 23px; }
  .design-inspector-empty > h3 { font-size: 15px; }
  .design-inspector-empty > p { font-size: 11px; }
  .design-inspector-tip { grid-column: 2; grid-row: auto; border-left: 0; border-top: 1px solid #474d45; padding: 12px 0 0; margin-top: 5px; }
  .design-inspector-tip strong { font-size: 10px; }
  .design-inspector-tip p { font-size: 10px; }
  .design-load-controls { padding: 20px 18px; gap: 22px 19px; }
  .design-load-controls > label > span { font-size: 10px; flex-wrap: wrap; gap: 5px; }
  .design-load-controls strong { font-size: 10px; }
  .design-window-label { display: block; font-size: 9px; }
  .design-window-label > select { width: 100%; min-height: 39px; font-size: 11px; margin-top: 7px; }
  .design-load-controls > .text-btn { justify-self: end; font-size: 10px; min-height: 40px; text-align: right; }
  .design-metrics { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .design-metric { padding: 18px; }
  .design-metric:nth-child(3) { border-left: 0; }
  .design-metric:nth-child(n+3) { border-top: 1px solid #3a403d; }
  .design-metric > span { font-size: 10px; }
  .design-metric > strong { font-size: 23px; margin-top: 8px; }
  .design-metric > em { font-size: 9px; }
  .design-feedback { padding: 18px; }
  .design-feedback-idle { flex-direction: column; gap: 7px; align-items: flex-start; line-height: 1.8; }
  .design-feedback-idle > strong { font-size: 12px; }
  .design-run-summary > p { font-size: 12px; }
  .design-latency { font-size: 10px; line-height: 1.9; }
  .design-feedback-errors > strong { font-size: 12px; }
  .design-warning-list { font-size: 11px; padding-left: 25px; }
  .design-table-wrap { padding: 14px; }
  .design-data-table th, .design-data-table td { padding: 10px; }
  .design-data-table .text-btn { min-height: 36px; font-size: 11px; }
  .design-connections-list { padding: 3px 17px 17px; }
  .design-connections-list > div { font-size: 10px; gap: 10px; flex-wrap: wrap; }
  .design-connections-list .text-btn { min-height: 36px; font-size: 10px; }
  .design-learning, .design-checks-panel { padding: 20px; }
  .design-bottom-grid { margin-top: 20px; gap: 18px; }
  .design-learning-head { flex-wrap: wrap; gap: 15px; margin-bottom: 17px; }
  .design-learning h2 { font-size: 21px; }
  .design-help-actions { width: 100%; gap: 20px; }
  .design-help-actions > button { min-height: 40px; font-size: 11px; }
  .design-learning-head .eyebrow, .design-checks-title .eyebrow { font-size: 9px; }
  .design-explanation-label { font-size: 11px; }
  #design-notes { font-size: 12px; line-height: 1.9; min-height: 190px; }
  .design-notes-footer { gap: 9px; }
  .design-notes-footer > a { min-height: 34px; font-size: 10px; }
  .design-notes-footer > span { font-size: 9px; }
  .design-assumptions summary { font-size: 11px; line-height: 1.8; }
  .design-assumptions p { font-size: 11px; }
  .design-sources a { min-height: 30px; font-size: 10px; }
  .design-checks-title h2 { font-size: 21px; }
  .design-checks-title p { font-size: 12px; }
  .design-check-list { grid-template-columns: 1fr; }
  .design-check-item strong { font-size: 12px; }
  .design-check-item p { font-size: 11px; }
  .design-check-item small { font-size: 10px; }
  .design-checks-panel > .primary { min-height: 41px; font-size: 12px; }
  .design-history > summary { min-height: 30px; font-size: 11px; }
  .design-backup { display: block; margin-top: 23px; padding-top: 20px; }
  .design-backup strong { font-size: 12px; }
  .design-backup p { font-size: 10px; }
  .design-backup > div:last-child { margin-top: 15px; gap: 22px; flex-wrap: wrap; }
  .design-backup button { min-height: 40px; font-size: 11px; }
  .design-import-confirm { padding: 18px; }
  .design-import-confirm button { min-height: 40px; }
}
@media (max-width: 480px) {
  .design-challenge-bar { gap: 11px; }
  .design-challenge-choice > select { font-size: 13px; }
  .design-challenge-meta { width: 100%; padding-left: 36px; margin-top: -2px; }
  .design-primary-actions { margin-top: 2px; }
  .design-primary-actions button { font-size: 10px; padding: 9px 11px; }
  .design-view-tabs { width: 100%; }
  .design-view-tabs > button { flex: 1; min-height: 33px; font-size: 10px; }
  .design-toolbar-tools { width: 100%; justify-content: flex-start; gap: 7px; }
  .design-toolbar-tools > button.text-btn { margin-left: auto; }
  .design-canvas-top > span:last-child { font-size: 7px; }
  .design-canvas-top > span:first-child { font-size: 8px; }
  .design-inspector { gap: 11px 13px; padding: 17px; }
  .design-inspector-empty { grid-template-columns: minmax(0,1fr); gap: 8px; }
  .design-inspector-empty > .design-icon { display: none; }
  .design-inspector-empty > h3, .design-inspector-empty > p, .design-inspector-tip { grid-column: 1; }
  .design-inspector-tip { margin-top: 4px; }
  .design-inspector-connect { grid-column: 1 / -1; }
  .design-inspector-links { grid-column: 1 / -1; }
  .design-inspector-links:empty { margin: 0; display: none; }
  .design-failure-switch strong { font-size: 10px; }
  .design-failure-switch small { font-size: 8px; }
  .design-node-observation { padding: 9px; }
  .design-node-observation > p { font-size: 9px; }
  .design-load-controls > label > span { font-size: 9px; }
  .design-load-controls strong { font-size: 9px; }
  .design-metric > strong { font-size: 21px; }
  .design-metric > strong > small { font-size: 9px; }
  .design-feedback { padding: 17px; }
  .design-learning, .design-checks-panel { padding: 18px; }
  .design-notes-footer > span { font-size: 8px; }
}
@media (prefers-reduced-motion: reduce) {
  .design-flow { animation: none !important; stroke-dasharray: 4 14; }
}
body.reduce-motion .design-flow { animation: none !important; stroke-dasharray: 4 14; }

.design-inspector-close { margin-left: auto; font-size: 21px; line-height: 1; min-width: 32px; }