:root {
    --hw-bg: #f4f5f7;
    --hw-panel-bg: #ffffff;
    --hw-border: #e0e2e8;
    --hw-text: #1e222a;
    --hw-text-muted: #6b7280;
    --hw-accent: #3454d1;
    --hw-accent-hover: #2a44ac;
    --hw-accent-soft: #e8ecfd;
    --hw-warning-bg: #fff4e5;
    --hw-warning-border: #f2c078;
    --hw-warning-text: #7a4a00;
    --hw-danger-bg: #fdecec;
    --hw-danger-border: #e88b8b;
    --hw-danger-text: #8a1f1f;
    --hw-radius: 10px;
    --hw-font: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
}

html, body {
    height: 100%;
    background: var(--hw-bg);
    color: var(--hw-text);
    font-family: var(--hw-font);
    font-size: 14px;
}

.hw-app {
    display: grid;
    grid-template-columns: 400px 1fr;
    grid-template-rows: auto 1fr;
    grid-template-areas:
        "topbar topbar"
        "sidebar main";
    min-height: 100vh;
}

.hw-topbar {
    grid-area: topbar;
    padding: 14px 22px;
    background: var(--hw-panel-bg);
    border-bottom: 1px solid var(--hw-border);
    display: flex;
    align-items: baseline;
    gap: 12px;
}

.hw-topbar h1 {
    font-size: 18px;
    font-weight: 700;
}

.hw-subtitle {
    color: var(--hw-text-muted);
    font-size: 12.5px;
}

.hw-sidebar {
    grid-area: sidebar;
    overflow-y: auto;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 14px;
    border-right: 1px solid var(--hw-border);
    max-height: calc(100vh - 54px);
}

.hw-main {
    grid-area: main;
    padding: 16px 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    min-width: 0;
}

.hw-panel {
    background: var(--hw-panel-bg);
    border: 1px solid var(--hw-border);
    border-radius: var(--hw-radius);
    padding: 14px 16px;
}

.hw-panel > h2 {
    font-size: 12.5px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--hw-text-muted);
    margin-bottom: 10px;
    font-weight: 700;
}

.hw-field {
    display: flex;
    flex-direction: column;
    gap: 4px;
    font-size: 12.5px;
    color: var(--hw-text-muted);
    margin-bottom: 10px;
    flex: 1;
    min-width: 0;
}

.hw-field > span {
    display: flex;
    justify-content: space-between;
}

.hw-field input[type="text"],
.hw-field input[type="number"],
.hw-field select,
.hw-field textarea {
    background: #fbfbfc;
    border: 1px solid var(--hw-border);
    border-radius: 6px;
    padding: 6px 8px;
    color: var(--hw-text);
    font-size: 13px;
}

.hw-field textarea {
    resize: vertical;
    font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
    font-size: 12.5px;
    line-height: 1.5;
}

.hw-field input[type="range"] {
    width: 100%;
    accent-color: var(--hw-accent);
}

.hw-field output {
    font-size: 11.5px;
    color: var(--hw-text-muted);
    text-align: right;
}

.hw-checkbox {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
}

.hw-checkbox input {
    accent-color: var(--hw-accent);
    width: 16px;
    height: 16px;
}

.hw-row {
    display: flex;
    gap: 10px;
    align-items: flex-end;
}

.hw-row--4 {
    flex-wrap: wrap;
}

.hw-row--4 .hw-field {
    min-width: 100px;
}

.hw-field--grow {
    flex: 2;
}

.hw-btn {
    background: #eef0f4;
    border: 1px solid var(--hw-border);
    border-radius: 7px;
    padding: 8px 12px;
    font-size: 12.5px;
    font-weight: 600;
    white-space: nowrap;
    transition: background 0.12s ease;
}

.hw-btn:hover {
    background: #e3e6ec;
}

.hw-btn--primary {
    background: var(--hw-accent);
    color: #fff;
    border-color: var(--hw-accent);
}

.hw-btn--primary:hover {
    background: var(--hw-accent-hover);
}

.hw-btn--ghost {
    background: transparent;
    color: var(--hw-text-muted);
    width: 100%;
    margin-top: 4px;
}

.hw-btn--icon {
    padding: 6px 10px;
    font-size: 13px;
}

.hw-btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

.hw-preset-group {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
    margin-bottom: 10px;
}

.hw-preset-btn {
    background: #fbfbfc;
    border: 1px solid var(--hw-border);
    border-radius: 7px;
    padding: 9px 6px;
    font-size: 12.5px;
    font-weight: 600;
    text-align: center;
}

.hw-preset-btn.active {
    background: var(--hw-accent-soft);
    border-color: var(--hw-accent);
    color: var(--hw-accent);
}

.hw-advanced {
    margin-top: 6px;
    border-top: 1px dashed var(--hw-border);
    padding-top: 8px;
}

.hw-advanced summary {
    cursor: pointer;
    font-size: 12.5px;
    font-weight: 600;
    color: var(--hw-text-muted);
    margin-bottom: 8px;
}

.hw-slider {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    column-gap: 8px;
    row-gap: 2px;
}

.hw-slider > span {
    grid-column: 1 / 3;
}

.hw-slider input[type="range"] {
    grid-column: 1;
}

.hw-slider output {
    grid-column: 2;
}

.hw-warning {
    background: var(--hw-warning-bg);
    border: 1px solid var(--hw-warning-border);
    color: var(--hw-warning-text);
    border-radius: 7px;
    padding: 8px 10px;
    font-size: 12px;
    margin-bottom: 10px;
    line-height: 1.4;
}

/* ---- main / preview ---- */

.hw-toolbar {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 10px;
    background: var(--hw-panel-bg);
    border: 1px solid var(--hw-border);
    border-radius: var(--hw-radius);
    padding: 10px 12px;
}

.hw-toolbar-group {
    display: flex;
    gap: 8px;
    align-items: center;
}

.hw-toolbar select {
    background: #fbfbfc;
    border: 1px solid var(--hw-border);
    border-radius: 6px;
    padding: 7px 8px;
    font-size: 12.5px;
}

.hw-preview-wrap {
    background: var(--hw-panel-bg);
    border: 1px solid var(--hw-border);
    border-radius: var(--hw-radius);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 420px;
}

.hw-preview-viewport {
    flex: 1;
    overflow: auto;
    background: #eceef2;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

#preview-svg {
    width: 100%;
    height: 100%;
    max-height: 78vh;
    background: transparent;
    cursor: grab;
    touch-action: none;
    user-select: none;
}

#preview-svg.hw-panning {
    cursor: grabbing;
}

.hw-bed { fill: #dfe2e8; stroke: #b9bec9; stroke-width: 0.6; }
.hw-paper { fill: #ffffff; stroke: #9aa0ad; stroke-width: 0.4; filter: drop-shadow(0 0 1.5px rgba(0,0,0,0.15)); }
.hw-margins { fill: none; stroke: #c7cbd6; stroke-width: 0.25; stroke-dasharray: 1.4 1.2; }

.hw-stroke {
    fill: none;
    stroke: #23262f;
    stroke-width: 0.42;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.hw-travel {
    fill: none;
    stroke: #7d93e8;
    stroke-width: 0.2;
    stroke-dasharray: 0.8 0.8;
    opacity: 0.6;
}

.hw-debug-anchor { fill: #d1425b; }
.hw-debug-label { font-size: 2.6px; fill: #d1425b; }

.hw-simulating .hw-stroke {
    stroke: #cfd3dc;
}

.hw-ink {
    fill: none;
    stroke: #1c1f27;
    stroke-width: 0.46;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.hw-pen-marker {
    fill: #e0483f;
    stroke: #ffffff;
    stroke-width: 0.25;
}

.hw-pen-marker.hw-pen-down {
    fill: #3454d1;
}

.hw-sim-bar {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    border-top: 1px solid var(--hw-border);
    background: #fafbfc;
    flex-wrap: wrap;
}

.hw-sim-speeds {
    display: flex;
    gap: 4px;
}

.hw-sim-speed-btn {
    background: #eef0f4;
    border: 1px solid var(--hw-border);
    border-radius: 5px;
    padding: 4px 8px;
    font-size: 11.5px;
    font-weight: 600;
}

.hw-sim-speed-btn.active {
    background: var(--hw-accent);
    color: #fff;
    border-color: var(--hw-accent);
}

.hw-sim-progress {
    flex: 1;
    min-width: 100px;
    height: 6px;
    background: #e3e6ec;
    border-radius: 4px;
    overflow: hidden;
}

.hw-sim-progress-bar {
    height: 100%;
    width: 0%;
    background: var(--hw-accent);
    transition: width 0.05s linear;
}

.hw-sim-readout {
    font-family: ui-monospace, Consolas, monospace;
    font-size: 11.5px;
    color: var(--hw-text-muted);
    white-space: nowrap;
}

#sim-pen-state {
    font-weight: 700;
    color: var(--hw-accent);
}

.hw-warnings {
    background: var(--hw-danger-bg);
    border: 1px solid var(--hw-danger-border);
    color: var(--hw-danger-text);
    border-radius: var(--hw-radius);
    padding: 10px 14px;
    font-size: 12.5px;
    line-height: 1.5;
}

.hw-warnings ul {
    margin-top: 4px;
    padding-left: 18px;
    list-style: disc;
}

.hw-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 8px;
    background: var(--hw-panel-bg);
    border: 1px solid var(--hw-border);
    border-radius: var(--hw-radius);
    padding: 12px 14px;
}

.hw-stat {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.hw-stat .hw-stat-value {
    font-size: 16px;
    font-weight: 700;
}

.hw-stat .hw-stat-label {
    font-size: 11px;
    color: var(--hw-text-muted);
}

.hw-gcode-panel textarea {
    width: 100%;
    font-family: ui-monospace, Consolas, monospace;
    font-size: 11.5px;
    background: #14161c;
    color: #d7dae2;
    border: none;
    border-radius: 6px;
    padding: 10px;
    line-height: 1.5;
}

.hw-gcode-panel summary {
    cursor: pointer;
    font-weight: 700;
    font-size: 12.5px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--hw-text-muted);
    margin-bottom: 8px;
}

[data-engine][hidden] {
    display: none !important;
}

.hw-hint {
    font-size: 12px;
    line-height: 1.45;
    color: var(--hw-text-muted);
    margin: 0 0 10px;
}

.hw-gen-status {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--hw-panel-bg);
    border: 1px solid var(--hw-border);
    border-radius: var(--hw-radius);
    padding: 8px 12px;
    font-size: 13px;
}

.hw-gen-status[hidden] {
    display: none;
}

.hw-gen-progress {
    flex: 1;
    height: 6px;
    border-radius: 3px;
    background: var(--hw-border);
    overflow: hidden;
}

.hw-gen-progress-bar {
    height: 100%;
    width: 0;
    background: var(--hw-accent, #3b6fd4);
    transition: width 0.2s;
}

@media (max-width: 980px) {
    .hw-app {
        grid-template-columns: 1fr;
        grid-template-areas:
            "topbar"
            "sidebar"
            "main";
    }
    .hw-sidebar {
        max-height: none;
        border-right: none;
        border-bottom: 1px solid var(--hw-border);
    }
}