/* 舒尔特训练页统一视觉层。训练配色只作用于方格区域。 */

:root {
    --grid-bg: #c8e6c9;
    --cell-bg: #ffffff;
    --cell-text: #2d4a38;
    --cell-active: #81c784;
    --cell-active-text: rgba(255, 255, 255, 0.58);
    --color-primary: #5f826f;
    --color-primary-dark: #3f6352;
}

body.training-legacy {
    display: block;
    min-height: 100vh;
    padding: 0;
    color: var(--color-text);
    background:
        radial-gradient(circle at 10% 0%, rgba(230, 184, 97, 0.12), transparent 30%),
        radial-gradient(circle at 95% 18%, rgba(95, 130, 111, 0.12), transparent 28%),
        var(--color-bg);
    font-family: ui-rounded, "SF Pro Rounded", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
    line-height: 1.75;
    user-select: auto;
}

.training-legacy .site-header {
    width: 100%;
}

.training-shell {
    width: min(calc(100% - 40px), var(--layout-content));
    margin: 0 auto;
    padding: var(--space-4xl) 0 0;
}

.training-intro {
    max-width: 760px;
    margin-bottom: var(--space-2xl);
    text-align: left;
}

.training-intro .eyebrow {
    margin-bottom: var(--space-md);
}

.training-intro .title {
    max-width: none;
    margin: 0 0 var(--space-md);
    color: var(--color-text);
    font-size: clamp(40px, 5vw, var(--font-h1));
    line-height: 1.18;
    letter-spacing: -0.035em;
    text-align: left;
}

.training-intro > p {
    max-width: 680px;
    margin-bottom: var(--space-lg);
    color: var(--color-text-muted);
    font-size: var(--font-body-lg);
}

.training-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-xs);
}

.training-guide-link {
    min-height: 32px;
    display: inline-flex;
    align-items: center;
    padding: 0 var(--space-xs);
    color: var(--color-brand-dark);
    font-size: var(--font-small);
    font-weight: 650;
    text-underline-offset: 4px;
}

.training-card {
    width: 100%;
    padding: clamp(24px, 5vw, 52px);
    overflow: hidden;
}

.training-controls {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: var(--space-xl);
    align-items: start;
    margin-bottom: var(--space-xl);
}

.training-control-group {
    min-width: 0;
}

.training-control-label {
    margin-bottom: var(--space-sm);
    color: var(--color-text);
    font-size: var(--font-small);
    font-weight: 700;
}

.training-legacy .control {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-start;
    gap: var(--space-xs);
    margin: 0;
}

.training-legacy .difficulty-btn {
    min-height: 44px;
    padding: 0 var(--space-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-control);
    color: var(--color-text);
    background: var(--color-surface);
    font-size: var(--font-small);
    font-weight: 650;
    cursor: pointer;
    transition: color 160ms ease, border-color 160ms ease, background 160ms ease, box-shadow 90ms ease, filter 90ms ease, transform 90ms ease;
}

.training-legacy .difficulty-btn.active {
    border-color: var(--color-brand-dark);
    color: var(--color-brand-dark);
    background: var(--color-brand-soft);
    box-shadow: inset 0 0 0 1px var(--color-brand-dark);
    font-weight: 700;
}

.training-legacy .difficulty-btn.active::before {
    content: "✓";
    margin-right: 6px;
}

.training-legacy .difficulty-btn:active {
    filter: brightness(0.96);
    transform: scale(0.97);
}

.training-legacy .theme-switcher {
    position: static;
    width: auto;
    display: flex;
    gap: var(--space-xs);
    align-items: center;
    justify-content: flex-start;
    padding: 0;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
    transform: none;
    backdrop-filter: none;
}

.training-legacy .theme-btn {
    position: relative;
    width: 36px;
    height: 36px;
    flex: 0 0 36px;
    padding: 0;
    border: 2px solid var(--color-surface);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 0 1px var(--color-border);
    transition: box-shadow 160ms ease, filter 90ms ease, transform 90ms ease;
}

.training-legacy .theme-btn:active {
    filter: brightness(0.94);
    transform: scale(0.92);
}

.training-legacy .theme-btn.active {
    border-color: var(--color-surface);
    box-shadow: 0 0 0 2px var(--color-brand-dark);
    transform: none;
}

.training-legacy .theme-btn.active:active {
    filter: brightness(0.94);
    transform: scale(0.92);
}

.training-legacy .theme-btn.active::after {
    content: "✓";
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    color: var(--color-surface);
    font-size: 15px;
    font-weight: 700;
    text-shadow: 0 1px 3px rgba(38, 53, 45, 0.55);
}

.training-legacy .theme-green {
    background: #73b382;
}

.training-legacy .theme-blue {
    background: #73a3b3;
}

.training-legacy .theme-pink {
    background: #b37393;
}

.training-legacy .theme-yellow {
    background: #b3a373;
}

.training-legacy .theme-dark {
    background: #3a4655;
}

.time-panel {
    display: grid;
    justify-items: center;
    gap: 4px;
    margin: var(--space-lg) 0 var(--space-xl);
}

.time-panel > span {
    color: var(--color-text-muted);
    font-size: var(--font-small);
    font-weight: 600;
}

.training-legacy .time {
    margin: 0;
    padding: 0;
    color: var(--color-text);
    background: transparent;
    font-size: clamp(34px, 6vw, 48px);
    font-variant-numeric: tabular-nums;
    font-weight: 700;
    letter-spacing: -0.025em;
    box-shadow: none;
    backdrop-filter: none;
}

.training-legacy .grid-container {
    width: 100%;
    max-width: 100%;
    margin: 0;
    padding: var(--space-xs);
    overflow-x: auto;
    overflow-y: hidden;
    border-radius: var(--radius-card);
    touch-action: pan-x;
    scrollbar-width: thin;
}

.training-legacy .grid {
    --grid-gap: 12px;
    --cell-size: 100px;
    --cell-font: 34px;
    width: max-content;
    display: grid;
    grid-template-columns: repeat(var(--grid-size, 3), var(--cell-size)) !important;
    gap: var(--grid-gap);
    margin: 0 auto;
    padding: var(--space-md);
    border-radius: var(--radius-card);
    background: var(--grid-bg);
    box-shadow: none;
    touch-action: manipulation;
}

.training-legacy .grid[data-size="3"] {
    --cell-size: 112px;
    --grid-gap: 14px;
    --cell-font: 36px;
}

.training-legacy .grid[data-size="4"] {
    --cell-size: 96px;
    --grid-gap: 12px;
    --cell-font: 32px;
}

.training-legacy .grid[data-size="5"] {
    --cell-size: 84px;
    --grid-gap: 10px;
    --cell-font: 28px;
}

.training-legacy .grid[data-size="6"] {
    --cell-size: 74px;
    --grid-gap: 8px;
    --cell-font: 24px;
}

.training-legacy .grid[data-size="7"] {
    --cell-size: 66px;
    --grid-gap: 6px;
    --cell-font: 21px;
}

.training-legacy .cell {
    position: relative;
    top: 0;
    width: var(--cell-size);
    height: var(--cell-size);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 0;
    padding: 0;
    border-radius: var(--radius-control);
    color: var(--cell-text);
    background: var(--cell-bg);
    font-size: var(--cell-font);
    font-weight: 700;
    cursor: pointer;
    user-select: none;
    touch-action: manipulation;
    box-shadow: 0 4px 12px rgba(42, 62, 51, 0.09);
    transform: scale(1);
    transition: color 160ms ease, background 160ms ease, box-shadow 100ms ease, filter 100ms ease, transform 100ms ease;
}

.training-legacy .cell:hover {
    top: 0;
    box-shadow: 0 4px 12px rgba(42, 62, 51, 0.09);
    transform: scale(1);
}

.training-legacy .cell:active,
.training-legacy .cell.pressed {
    top: 0;
    filter: brightness(0.94);
    transform: translateY(2px) scale(0.92);
    box-shadow:
        inset 0 2px 4px rgba(42, 62, 51, 0.12),
        0 1px 3px rgba(42, 62, 51, 0.06);
    transition-duration: 40ms;
}

.training-legacy .cell.active {
    top: 0;
    color: var(--cell-active-text);
    background: var(--cell-active);
    box-shadow: none;
    filter: none;
    transform: scale(1);
    pointer-events: none;
}

.training-legacy .cell.active.pressed {
    filter: brightness(0.94);
    transform: translateY(2px) scale(0.92);
    box-shadow:
        inset 0 2px 4px rgba(42, 62, 51, 0.12),
        0 1px 3px rgba(42, 62, 51, 0.06);
    transition-duration: 40ms;
}

@keyframes gentle-nudge {
    0%,
    100% {
        transform: translateX(0);
    }
    35% {
        transform: translateX(-6px);
    }
    70% {
        transform: translateX(6px);
    }
}

.training-legacy .cell.wrong {
    border: 0;
    animation: gentle-nudge 250ms ease-out;
}

.training-legacy .result {
    min-height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: var(--space-lg) auto 0;
    padding: var(--space-sm) var(--space-md);
    border: 0;
    border-radius: var(--radius-control);
    color: var(--color-text);
    background: var(--color-brand-soft);
    font-size: var(--font-body);
    font-weight: 600;
    line-height: 1.6;
    text-align: center;
    box-shadow: none;
}

.training-legacy .result.completed {
    flex-direction: column;
    gap: 4px;
    padding: var(--space-md) var(--space-lg);
    border-left: 4px solid var(--color-accent);
    background: var(--color-bg-soft);
}

.result-title {
    color: var(--color-text);
    font-size: var(--font-body-lg);
}

.result-detail {
    color: var(--color-text-muted);
    font-size: var(--font-small);
    font-weight: 500;
}

.next-number {
    margin-left: 6px;
    color: var(--color-brand-dark);
    font-size: 22px;
    font-weight: 700;
}

.training-legacy .restart-btn-wrapper {
    display: flex;
    justify-content: center;
    margin-top: var(--space-md);
}

.training-legacy #restartBtn {
    min-height: 50px;
    padding: 0 22px;
    border: 1px solid var(--color-brand);
    border-radius: var(--radius-pill);
    color: var(--color-brand-dark);
    background: transparent;
    font-size: var(--font-control);
    box-shadow: none;
}

.training-summary {
    margin-top: var(--space-lg);
}

.training-legacy .best {
    width: 100%;
    max-width: none;
    margin: 0;
    padding: var(--space-md) var(--space-lg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-control);
    color: var(--color-brand-dark);
    background: var(--color-surface);
    font-size: var(--font-body);
    font-weight: 700;
    text-align: center;
    box-shadow: none;
    backdrop-filter: none;
}

.training-legacy .history-area {
    width: 100%;
    max-width: none;
    margin: var(--space-xl) 0 0;
    padding: var(--space-xl);
    backdrop-filter: none;
}

.training-legacy .history-header {
    margin-bottom: var(--space-md);
}

.training-legacy .history-title {
    margin: 0;
    color: var(--color-text);
    font-size: var(--font-h3);
    font-weight: 700;
}

.training-legacy .history-list {
    display: grid;
    gap: var(--space-xs);
}

.training-legacy .history-item {
    display: grid;
    grid-template-columns: 84px 100px 1fr;
    gap: var(--space-md);
    align-items: center;
    min-height: 48px;
    padding: var(--space-sm) var(--space-md);
    border: 0;
    border-radius: var(--radius-control);
    background: var(--color-bg);
    box-shadow: none;
}

.training-legacy .history-item .level {
    width: auto;
    color: var(--color-brand-dark);
}

.training-legacy .history-item .score {
    width: auto;
    color: var(--color-text);
    text-align: left;
}

.training-legacy .history-item .date {
    color: var(--color-text-muted);
    font-size: var(--font-small);
}

.training-legacy .empty {
    padding: var(--space-xl) var(--space-lg);
    border: 1px dashed var(--color-border);
    border-radius: var(--radius-control);
    color: var(--color-text-muted);
    background: var(--color-bg);
    font-size: var(--font-body);
}

.parent-note {
    margin-top: var(--space-xl);
}

.parent-note h2 {
    margin-bottom: var(--space-xs);
    color: var(--color-text);
    font-size: var(--font-h3);
}

.parent-note p {
    margin-bottom: var(--space-md);
    color: var(--color-text-muted);
}

.parent-note-links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-lg);
}

.parent-note-links a {
    color: var(--color-brand-dark);
    font-size: var(--font-small);
    font-weight: 650;
    text-underline-offset: 4px;
}

.training-legacy .cache-clear-container {
    position: static;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-sm) var(--space-lg);
    margin: var(--space-lg) 0 0;
    transform: none;
}

.training-legacy .cache-size-text {
    color: var(--color-text-muted);
    font-size: var(--font-caption);
}

.training-legacy .data-clear-button {
    min-height: 44px;
    padding: 8px 2px;
    border: 0;
    color: var(--color-text-muted);
    background: transparent;
    font: inherit;
    font-size: var(--font-caption);
    text-decoration: underline;
    text-underline-offset: 4px;
    cursor: pointer;
}

.training-legacy .site-footer {
    width: 100%;
    margin-top: var(--space-4xl);
}

@media (hover: hover) and (pointer: fine) {
    .training-legacy .data-clear-button:hover {
        color: var(--color-text);
    }

    .training-legacy .difficulty-btn:hover:not(.active):not(:active) {
        border-color: var(--color-brand);
        color: var(--color-brand-dark);
        background: var(--color-brand-soft);
    }

    .training-legacy .theme-btn:hover:not(:active) {
        transform: translateY(-2px);
    }
}

@media (min-width: 1440px) {
    .training-shell {
        width: min(calc(100% - 64px), 1240px);
    }

    .training-legacy .grid[data-size="3"] {
        --cell-size: 128px;
        --grid-gap: 16px;
        --cell-font: 40px;
    }

    .training-legacy .grid[data-size="4"] {
        --cell-size: 106px;
        --grid-gap: 14px;
        --cell-font: 35px;
    }

    .training-legacy .grid[data-size="5"] {
        --cell-size: 92px;
        --grid-gap: 12px;
        --cell-font: 31px;
    }

    .training-legacy .grid[data-size="6"] {
        --cell-size: 80px;
        --grid-gap: 9px;
        --cell-font: 27px;
    }

    .training-legacy .grid[data-size="7"] {
        --cell-size: 74px;
        --grid-gap: 7px;
        --cell-font: 24px;
    }
}

@media (min-width: 2200px) {
    .training-shell {
        width: min(calc(100% - 96px), 1400px);
    }

    .training-legacy .grid[data-size="3"] {
        --cell-size: 140px;
        --grid-gap: 18px;
        --cell-font: 44px;
    }

    .training-legacy .grid[data-size="4"] {
        --cell-size: 116px;
        --grid-gap: 16px;
        --cell-font: 38px;
    }

    .training-legacy .grid[data-size="5"] {
        --cell-size: 104px;
        --grid-gap: 14px;
        --cell-font: 34px;
    }

    .training-legacy .grid[data-size="6"] {
        --cell-size: 90px;
        --grid-gap: 10px;
        --cell-font: 30px;
    }

    .training-legacy .grid[data-size="7"] {
        --cell-size: 82px;
        --grid-gap: 8px;
        --cell-font: 27px;
    }
}

@media (max-width: 860px) {
    .training-shell {
        padding-top: var(--space-3xl);
    }

    .training-controls {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }
}

@media (max-width: 560px) {
    .training-shell {
        width: calc(100% - 28px);
        padding-top: 54px;
    }

    .training-intro {
        margin-bottom: var(--space-xl);
    }

    .training-intro .title {
        margin-top: 0;
        font-size: 38px;
    }

    .training-intro > p {
        font-size: var(--font-body);
    }

    .training-card {
        display: flex;
        flex-direction: column;
        padding: var(--space-md);
        overflow: hidden;
    }

    .training-controls {
        display: contents;
    }

    .training-control-group:first-child {
        order: 1;
    }

    .time-panel {
        order: 2;
        margin: var(--space-lg) 0;
    }

    .training-legacy .grid-container {
        order: 3;
        width: calc(100% + 32px);
        max-width: none;
        margin-left: -16px;
        padding: 0 14px;
        border-radius: 0;
    }

    .training-legacy .result {
        order: 4;
        width: 100%;
    }

    .training-legacy .restart-btn-wrapper {
        order: 5;
    }

    .color-control-group {
        order: 6;
        margin-top: var(--space-xl);
        padding-top: var(--space-lg);
        border-top: 1px solid var(--color-border);
    }

    .training-legacy .control {
        flex-wrap: nowrap;
        justify-content: flex-start;
        padding-bottom: 4px;
        overflow-x: auto;
    }

    .training-legacy .difficulty-btn {
        flex: 0 0 auto;
    }

    .training-legacy .grid {
        padding: var(--space-xs);
    }

    .training-legacy .grid[data-size="3"] {
        --cell-size: clamp(72px, calc((100vw - 68px) / 3), 92px);
        --grid-gap: 12px;
        --cell-font: 30px;
    }

    .training-legacy .grid[data-size="4"] {
        --cell-size: clamp(60px, calc((100vw - 68px) / 4), 72px);
        --grid-gap: 8px;
        --cell-font: 25px;
    }

    .training-legacy .grid[data-size="5"] {
        --cell-size: clamp(52px, calc((100vw - 60px) / 5), 60px);
        --grid-gap: 4px;
        --cell-font: 21px;
    }

    .training-legacy .grid[data-size="6"] {
        --cell-size: clamp(46px, calc((100vw - 69px) / 6), 54px);
        --grid-gap: 5px;
        --cell-font: 18px;
    }

    .training-legacy .grid[data-size="7"] {
        --cell-size: clamp(42px, calc((100vw - 68px) / 7), 48px);
        --grid-gap: 4px;
        --cell-font: 16px;
    }

    .training-legacy .cell {
        min-width: var(--cell-size);
        min-height: var(--cell-size);
        font-size: var(--cell-font);
    }

    .training-legacy .history-area {
        padding: var(--space-lg);
    }

    .training-legacy .history-item {
        grid-template-columns: 1fr auto;
        gap: 4px var(--space-md);
    }

    .training-legacy .history-item .date {
        grid-column: 1 / -1;
        text-align: left;
    }
}

@media (prefers-reduced-motion: reduce) {
    .training-legacy .cell.wrong {
        animation: none;
        opacity: 0.86;
    }
}