.valid.modified:not([type=checkbox]) {
    outline: 1px solid #26b050;
}

.invalid {
    outline: 1px solid red;
}

.validation-message {
    color: red;
}

#blazor-error-ui {
    color-scheme: light only;
    background: lightyellow;
    bottom: 0;
    box-shadow: 0 -1px 2px rgba(0, 0, 0, 0.2);
    box-sizing: border-box;
    display: none;
    left: 0;
    padding: 0.6rem 1.25rem 0.7rem 1.25rem;
    position: fixed;
    width: 100%;
    z-index: 1000;
}

    #blazor-error-ui .dismiss {
        cursor: pointer;
        position: absolute;
        right: 0.75rem;
        top: 0.5rem;
    }

.blazor-error-boundary {
    background: url(data:image/svg+xml;base64,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) no-repeat 1rem/1.8rem, #b32121;
    padding: 1rem 1rem 1rem 3.7rem;
    color: white;
}

    .blazor-error-boundary::after {
        content: "An error has occurred."
    }

.loading-progress {
    position: absolute;
    display: block;
    width: 8rem;
    height: 8rem;
    inset: 20vh 0 auto 0;
    margin: 0 auto 0 auto;
}

    .loading-progress circle {
        fill: none;
        stroke: #e0e0e0;
        stroke-width: 0.6rem;
        transform-origin: 50% 50%;
        transform: rotate(-90deg);
    }

        .loading-progress circle:last-child {
            stroke: #1b6ec2;
            stroke-dasharray: calc(3.141 * var(--blazor-load-percentage, 0%) * 0.8), 500%;
            transition: stroke-dasharray 0.05s ease-in-out;
        }

.loading-progress-text {
    position: absolute;
    text-align: center;
    font-weight: bold;
    inset: calc(20vh + 3.25rem) 0 auto 0.2rem;
}

    .loading-progress-text:after {
        content: var(--blazor-load-percentage-text, "Loading");
    }

code {
    color: #c02d76;
}

.form-floating > .form-control-plaintext::placeholder, .form-floating > .form-control::placeholder {
    color: var(--bs-secondary-color);
    text-align: end;
}

.form-floating > .form-control-plaintext:focus::placeholder, .form-floating > .form-control:focus::placeholder {
    text-align: start;
}

/* App shell: a dark banner (chalkboard) holding the puzzle controls, above a
   paper-toned page where the puzzle grid itself stays classic black-on-white. */

:root {
    --ink: #1b1e2b;
    --ink-soft: #3a3f55;
    --paper: #ecebe6;
    --chalk: #e7b84b;
    --chalk-hover: #f0c862;
    --line: rgba(255, 255, 255, 0.12);
}

body {
    margin: 0;
    background: var(--paper);
    color: var(--ink);
    font-family: "Space Grotesk", ui-sans-serif, system-ui, -apple-system, sans-serif;
}

.app-banner {
    background: var(--ink);
}

.app-banner__inner {
    max-width: 64rem;
    margin: 0 auto;
    padding: 1.1rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.app-banner__title {
    margin: 0;
    font-size: 1.4rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    color: #f5f4f0;
}

.app-banner__controls {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    flex-wrap: wrap;
}

.control-group {
    display: flex;
    gap: 0.4rem;
}

.control-group:not(:first-child) {
    padding-left: 0.75rem;
    border-left: 1px solid var(--line);
}

.app-banner button {
    background: transparent;
    color: #f5f4f0;
    border: 1px solid var(--line);
    border-radius: 6px;
    padding: 0.45rem 0.85rem;
    font: inherit;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.15s ease, border-color 0.15s ease;
}

.app-banner button:hover {
    background: var(--ink-soft);
    border-color: var(--ink-soft);
}

.app-banner button:focus-visible,
.app-banner select:focus-visible {
    outline: 2px solid var(--chalk);
    outline-offset: 2px;
}

.app-banner button.primary {
    background: var(--chalk);
    border-color: var(--chalk);
    color: var(--ink);
    font-weight: 600;
}

.app-banner button.primary:hover {
    background: var(--chalk-hover);
    border-color: var(--chalk-hover);
}

.app-banner select {
    appearance: none;
    background-color: var(--ink-soft);
    background-image: linear-gradient(45deg, transparent 50%, #f5f4f0 50%), linear-gradient(135deg, #f5f4f0 50%, transparent 50%);
    background-position: calc(100% - 1.15rem) 55%, calc(100% - 0.85rem) 55%;
    background-size: 5px 5px, 5px 5px;
    background-repeat: no-repeat;
    color: #f5f4f0;
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 0.45rem 2.1rem 0.45rem 1rem;
    font: inherit;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
}

.app-main {
    max-width: 64rem;
    margin: 0 auto;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.status-message {
    align-self: flex-start;
    min-height: 1.3rem;
    margin: 0 0 1rem 0;
    color: var(--ink-soft);
    font-size: 0.9rem;
}

/* A Samurai Hexadoku composite (40x40 cells) is wider than most viewports --
   let it scroll horizontally, centered when it fits, rather than clipping or
   sitting flush against one edge. */
.grid-scroll {
    width: 100%;
    overflow-x: auto;
    display: flex;
    justify-content: center;
}

.app-banner__title:focus-visible {
    outline: 2px solid var(--chalk);
    outline-offset: 4px;
}

@media (max-width: 640px) {
    .control-group:not(:first-child) {
        border-left: none;
        padding-left: 0;
    }
}

.puzzle-grid, .samurai-grid {
    display: grid;
    width: fit-content;
}

.puzzle-grid {
    grid-template-columns: repeat(var(--order), 2rem);
    grid-template-rows: repeat(var(--order), 2rem);
}

/* See Components/SamuraiGridView.razor -- one grid over physical coordinates,
   sized to the composite's full bounding square rather than one board. */
.samurai-grid {
    grid-template-columns: repeat(var(--total-size), 2rem);
    grid-template-rows: repeat(var(--total-size), 2rem);
}

.cell {
    box-sizing: border-box;
    width: 2rem;
    height: 2rem;
    text-align: center;
    font-family: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
    font-size: 1rem;
    padding: 0;
    border: 0.5px solid #999;
    border-radius: 0;
    background: white;
    color: black;
}

.cell.box-left {
    border-left: 2px solid black;
}

.cell.box-top {
    border-top: 2px solid black;
}

.cell.edge-right {
    border-right: 2px solid black;
}

.cell.edge-bottom {
    border-bottom: 2px solid black;
}

.cell.given {
    background: #e8e8e8;
    font-weight: bold;
}

.cell.conflict {
    color: red;
}

.cell:read-only {
    caret-color: transparent;
}