.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;
}

html,
body,
#app {
    min-height: 100%;
    background:
        radial-gradient(circle at top, rgba(119, 181, 127, 0.18), transparent 34%),
        linear-gradient(180deg, #112019 0%, #09120e 100%);
}

html {
    color-scheme: dark;
}

body {
    margin: 0;
    font-family: "Trebuchet MS", "Segoe UI", sans-serif;
    background:
        radial-gradient(circle at top, rgba(119, 181, 127, 0.18), transparent 34%),
        linear-gradient(180deg, #112019 0%, #09120e 100%);
    color: #eef6ef;
}

button {
    font: inherit;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.game-shell {
    min-height: 100vh;
    box-sizing: border-box;
    padding: clamp(0.75rem, 2vw, 1.25rem);
    display: grid;
    gap: 1rem;
    max-width: 980px;
    margin: 0 auto;
}

.settings-panel,
.game-panel,
.metric-card,
.piece-card {
    background: rgba(12, 24, 19, 0.8);
    border: 1px solid rgba(184, 228, 193, 0.12);
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.28);
    backdrop-filter: blur(18px);
}

.settings-panel,
.game-panel,
.metric-card,
.piece-card {
    border-radius: 1.25rem;
}

.settings-panel,
.game-panel {
    padding: 1rem;
}

.settings-panel {
    display: grid;
    gap: 0.85rem;
}

.metric-strip {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.75rem;
}

.metric-card {
    display: grid;
    gap: 0.35rem;
    padding: 0.85rem 1rem;
}

.metric-card span,
.select-group span,
.piece-copy span {
    color: #9ab6a0;
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
}

.metric-card strong {
    font-size: clamp(1.25rem, 4vw, 1.8rem);
}

.settings-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.action-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.select-group {
    display: grid;
    gap: 0.35rem;
}

.action-button {
    border: 0;
    border-radius: 999px;
    color: #142013;
    padding: 0.75rem 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: transform 120ms ease, box-shadow 120ms ease;
}

.restart-button {
    background: linear-gradient(135deg, #f4b400 0%, #fb8500 100%);
}

.undo-button {
    background: linear-gradient(135deg, #7bdff2 0%, #5390d9 100%);
    color: #061823;
}

.select-group select {
    min-width: 8rem;
    border: 1px solid rgba(191, 225, 198, 0.12);
    border-radius: 0.9rem;
    background: rgba(21, 35, 28, 0.96);
    color: #eef6ef;
    padding: 0.7rem 0.85rem;
    font: inherit;
}

.action-button:hover,
.action-button:focus-visible,
.select-group select:focus-visible {
    transform: translateY(-1px);
}

.restart-button:hover,
.restart-button:focus-visible {
    box-shadow: 0 10px 26px rgba(244, 180, 0, 0.24);
}

.undo-button:hover,
.undo-button:focus-visible {
    box-shadow: 0 10px 26px rgba(83, 144, 217, 0.24);
}

.action-button:disabled {
    opacity: 0.5;
    cursor: default;
    transform: none;
    box-shadow: none;
}

.board-frame {
    position: relative;
    padding: 0.7rem;
    background: linear-gradient(180deg, rgba(33, 54, 44, 0.95), rgba(18, 29, 24, 0.95));
    border-radius: 1.25rem;
    margin-bottom: 1rem;
}

.incoming-shape-flash {
    position: absolute;
    inset: 0;
    z-index: 4;
    display: grid;
    place-items: center;
    pointer-events: none;
}

.incoming-shape-card {
    padding: 1rem;
    border-radius: 1.2rem;
    background: rgba(245, 250, 246, 0.08);
    box-shadow:
        inset 0 0 0 1px rgba(244, 255, 247, 0.12),
        0 18px 40px rgba(0, 0, 0, 0.24);
    backdrop-filter: blur(10px);
    animation: incoming-shape-flash 520ms ease-out forwards;
}

.incoming-shape-preview {
    display: grid;
    grid-template-columns: repeat(var(--preview-cols), minmax(0, 1fr));
    grid-template-rows: repeat(var(--preview-rows), minmax(0, 1fr));
    gap: 0.36rem;
}

.incoming-shape-preview .piece-preview-cell {
    width: 1.45rem;
    border-radius: 0.32rem;
    background: rgba(41, 61, 51, 0.6);
}

.board-grid {
    display: grid;
    grid-template-columns: repeat(var(--board-size), minmax(0, 1fr));
    gap: 0.3rem;
    aspect-ratio: 1;
}

.board-cell {
    position: relative;
    border: 0;
    border-radius: 0.45rem;
    background: #21352b;
    box-shadow: inset 0 0 0 1px rgba(191, 225, 198, 0.08);
    cursor: pointer;
    overflow: hidden;
    isolation: isolate;
    transform-origin: center;
    transition: transform 120ms ease, background-color 120ms ease, box-shadow 120ms ease;
}

.board-cell:hover:not(:disabled),
.board-cell:focus-visible:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: inset 0 0 0 1px rgba(191, 225, 198, 0.16);
}

.board-cell:disabled {
    cursor: default;
}

.board-cell::before,
.board-cell::after {
    content: "";
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.board-cell.filled {
    background: linear-gradient(180deg, #d9c6ff 0%, #b48cff 100%);
    box-shadow:
        inset 0 0 0 1px rgba(247, 241, 255, 0.52),
        0 10px 20px rgba(180, 140, 255, 0.18);
}

.board-cell.placed {
    animation: place-pop 320ms ease-out;
}

.board-cell.clearing {
    background: linear-gradient(180deg, #ffe29a 0%, #ffb347 100%);
    box-shadow:
        inset 0 0 0 1px rgba(255, 248, 224, 0.72),
        0 0 22px rgba(255, 209, 102, 0.42);
    animation: clear-flash 480ms ease forwards;
}

.board-cell.clearing::before,
.board-cell.clearing::after {
    clip-path: polygon(50% 0%, 61% 34%, 98% 35%, 68% 57%, 79% 94%, 50% 71%, 21% 94%, 32% 57%, 2% 35%, 39% 34%);
    background: linear-gradient(180deg, #fff8d8 0%, #ffe08a 100%);
    filter: drop-shadow(0 0 6px rgba(255, 248, 224, 0.9));
    animation: star-burst 360ms ease-out forwards;
}

.board-cell.clearing::before {
    width: 34%;
    aspect-ratio: 1;
    left: 11%;
    top: 9%;
    animation-delay: 120ms;
}

.board-cell.clearing::after {
    width: 24%;
    aspect-ratio: 1;
    right: 12%;
    bottom: 13%;
    animation-delay: 200ms;
}

.board-cell.preview-valid {
    background: linear-gradient(180deg, #73d2a2 0%, #43aa8b 100%);
}

.board-cell.preview-invalid {
    background: linear-gradient(180deg, rgba(255, 201, 201, 0.7) 0%, rgba(255, 145, 145, 0.82) 100%);
    box-shadow: inset 0 0 0 1px rgba(255, 232, 232, 0.35);
}

.board-cell.preview-conflict {
    background: rgba(255, 255, 255, 0.04);
    box-shadow:
        inset 0 0 0 2px rgba(232, 67, 67, 0.92),
        0 0 12px rgba(232, 67, 67, 0.12);
}

.board-cell.hint {
    background: linear-gradient(180deg, rgba(179, 235, 203, 0.3) 0%, rgba(96, 191, 144, 0.42) 100%);
    box-shadow:
        inset 0 0 0 2px rgba(149, 226, 185, 0.55),
        0 0 16px rgba(115, 210, 162, 0.12);
}

.piece-tray {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.75rem;
}

.piece-card {
    display: grid;
    justify-items: center;
    align-content: center;
    gap: 0.75rem;
    width: 100%;
    text-align: center;
    padding: 0.9rem 0.75rem;
    color: inherit;
    cursor: pointer;
    transition: transform 120ms ease, border-color 120ms ease, background-color 120ms ease;
}

.piece-card:hover:not(:disabled),
.piece-card:focus-visible:not(:disabled) {
    transform: translateY(-1px);
    border-color: rgba(191, 225, 198, 0.18);
}

.piece-card.selected {
    border-color: rgba(244, 180, 0, 0.68);
    background: rgba(50, 44, 18, 0.92);
}

.piece-card.used {
    opacity: 0.4;
    box-shadow: none;
}

.piece-preview {
    display: grid;
    grid-template-columns: repeat(var(--preview-cols), minmax(0, 1fr));
    grid-template-rows: repeat(var(--preview-rows), minmax(0, 1fr));
    gap: 0.3rem;
    flex: 0 0 auto;
}

.piece-preview-cell {
    width: 1.1rem;
    aspect-ratio: 1;
    border-radius: 0.28rem;
    background: #293d33;
}

.piece-preview-cell.filled {
    background: var(--piece-accent);
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.18);
}

.piece-copy {
    display: grid;
    gap: 0.2rem;
}

.piece-copy strong {
    font-size: 0.92rem;
}

.result-overlay {
    position: fixed;
    inset: 0;
    z-index: 30;
    display: grid;
    place-items: center;
    padding: 1rem;
    background: rgba(4, 10, 8, 0.58);
    backdrop-filter: blur(10px);
}

.result-dialog {
    width: min(100%, 24rem);
    display: grid;
    gap: 1rem;
    padding: 1.4rem;
    border-radius: 1.4rem;
    background: linear-gradient(180deg, rgba(18, 31, 24, 0.96), rgba(10, 18, 14, 0.98));
    border: 1px solid rgba(184, 228, 193, 0.12);
    box-shadow: 0 28px 70px rgba(0, 0, 0, 0.42);
    text-align: center;
}

.result-label,
.result-stat span {
    margin: 0;
    color: #9ab6a0;
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.14em;
}

.result-dialog h2 {
    margin: 0;
    font-size: clamp(1.5rem, 4vw, 2rem);
}

.result-stats {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.75rem;
}

.result-stat {
    display: grid;
    gap: 0.35rem;
    padding: 0.9rem;
    border-radius: 1rem;
    background: rgba(35, 55, 45, 0.72);
}

.result-stat strong {
    font-size: 1.4rem;
}

.result-button {
    justify-self: center;
    min-width: 8rem;
    background: linear-gradient(135deg, #f4b400 0%, #fb8500 100%);
}

@media (max-width: 700px) {
    .settings-controls {
        flex-wrap: wrap;
    }

    .action-group {
        width: 100%;
        justify-content: flex-end;
    }
}

@keyframes place-pop {
    0% {
        transform: scale(0.72);
        box-shadow:
            inset 0 0 0 1px rgba(255, 241, 214, 0.78),
            0 0 0 rgba(251, 133, 0, 0);
    }

    55% {
        transform: scale(1.08);
        box-shadow:
            inset 0 0 0 1px rgba(255, 245, 224, 0.9),
            0 0 20px rgba(251, 133, 0, 0.32);
    }

    100% {
        transform: scale(1);
    }
}

@keyframes clear-flash {
    0% {
        transform: scale(1);
        opacity: 1;
    }

    35% {
        transform: scale(1.08);
        opacity: 1;
    }

    100% {
        transform: scale(0.58);
        opacity: 0.08;
    }
}

@keyframes star-burst {
    0% {
        opacity: 0;
        transform: translateY(0.35rem) scale(0.2) rotate(0deg);
    }

    35% {
        opacity: 1;
    }

    100% {
        opacity: 0;
        transform: translateY(-0.7rem) scale(1.25) rotate(24deg);
    }
}

@keyframes incoming-shape-flash {
    0% {
        opacity: 0;
        transform: scale(0.72);
    }

    25% {
        opacity: 1;
        transform: scale(1);
    }

    100% {
        opacity: 0;
        transform: scale(1.06);
    }
}

@media (max-width: 640px) {
    .game-shell {
        padding: 0.9rem;
    }

    .settings-panel,
    .game-panel {
        padding: 1rem;
    }

    .metric-strip,
    .piece-tray {
        grid-template-columns: 1fr;
    }

    .settings-controls {
        flex-direction: column;
        align-items: stretch;
    }

    .piece-card {
        grid-template-columns: auto 1fr;
        justify-items: start;
        text-align: left;
        padding: 0.9rem;
    }

    .piece-copy {
        align-self: center;
    }

    .result-stats {
        grid-template-columns: 1fr;
    }
}