/* 舒尔特方格 - 样式表 */
:root {
    --bg-color: #f0f0f0;
    --container-bg-color: #ffffff;
    --text-color: #333333;
    --cell-bg-color: #e0e0e0;
    --cell-text-color: #333333;
    --cell-border-color: #cccccc;
    --cell-hover-bg-color: #d0d0d0;
    --cell-clicked-bg-color: #4CAF50;
    --cell-clicked-text-color: #ffffff;
    --accent-color: #007bff;
    --font-size-base: 24px;
    --grid-gap: 8px;
    --panel-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    --panel-gap: 40px;
    --panel-gap-mobile: 30px;
    --transition-duration: 0.3s; /* Slightly faster */
    --bg-gradient: linear-gradient(135deg, var(--bg-color) 0%, var(--accent-color) 150%);
}

* {
    box-sizing: border-box;
    transition: all var(--transition-duration) ease-out;
}

body {
    font-family: 'Segoe UI', Roboto, 'Microsoft YaHei', sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    background: var(--bg-gradient);
    background-attachment: fixed;
    color: var(--text-color);
    margin: 0;
    padding: 20px;
    overflow-x: hidden;
}

.app-container {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--panel-gap);
    width: 100%;
    max-width: 1200px;
    margin-top: 20px;
    align-items: flex-start;
    transition: none;
}

.main-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: var(--container-bg-color);
    padding: 30px;
    border-radius: 16px;
    box-shadow: var(--panel-shadow);
    width: 100%;
    max-width: 550px;
    position: relative;
    flex-shrink: 1;
}

.game-header {
    text-align: center;
    width: 100%;
    margin-bottom: 20px;
}

h1 {
    color: #2c3e50;
    font-size: 2.2rem;
    margin: 0 0 20px 0;
    background: linear-gradient(90deg, #3498db, #2ecc71);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 800;
    transition: none;
}

.controls {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
    flex-wrap: wrap;
    justify-content: center;
}

.control-btn {
    padding: 10px 22px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    border: none;
    border-radius: 25px;
    color: white;
    background: #3498db;
    box-shadow: 0 3px 6px rgba(0, 0, 0, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    white-space: nowrap;
}

.control-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 10px rgba(0, 0, 0, 0.15);
    opacity: 0.9;
}

.control-btn:active {
    transform: translateY(0px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

#settings-btn {
    background: #9b59b6;
}

#restart-btn {
    background: #e67e22;
}

.game-info {
    display: flex;
    justify-content: space-around;
    width: 100%;
    margin-bottom: 20px;
    font-size: 1.1rem;
    flex-wrap: wrap;
    gap: 5px 10px;
    font-weight: 600;
    background-color: rgba(0, 0, 0, 0.03);
    border: 1px solid rgba(0, 0, 0, 0.05);
    color: var(--text-color);
    padding: 10px 15px;
    border-radius: 10px;
}

.game-info span > span {
    color: var(--accent-color);
    font-weight: 800;
    font-variant-numeric: tabular-nums;
}

#next-target-value.hint {
    font-style: italic;
    opacity: 0.7;
    font-weight: 600;
    color: var(--text-color);
}

#grid-container {
    display: grid;
    gap: var(--grid-gap);
    margin-bottom: 25px;
    width: 100%;
    max-width: min(85vw, 85vh, 480px);
    margin-left: auto;
    margin-right: auto;
    aspect-ratio: 1 / 1;
    border: 2px solid var(--cell-border-color);
    padding: var(--grid-gap);
    border-radius: 12px;
    background-color: var(--cell-border-color);
}

.grid-cell {
    display: flex;
    justify-content: center;
    align-items: center;
    aspect-ratio: 1 / 1;
    background-color: var(--cell-bg-color);
    color: var(--cell-text-color);
    border-radius: 8px;
    font-size: var(--font-size-base);
    font-weight: bold;
    cursor: pointer;
    user-select: none;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    backface-visibility: hidden;
}

/* Allow hover only if not clicked/disappeared/updating */
.grid-cell:not(.clicked):not(.clicked-disappear):not(.updating):hover {
    background-color: var(--cell-hover-bg-color);
    transform: scale(1.08);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
    z-index: 2;
}

/* Style for cell during value update transition */
.grid-cell.updating {
    background-color: var(--cell-clicked-bg-color);
    color: var(--cell-clicked-text-color);
    transform: scale(0.95);
    pointer-events: none;
}

.grid-cell.clicked {
    /* Final round non-disappear */
    background-color: var(--cell-clicked-bg-color);
    color: var(--cell-clicked-text-color);
    transform: scale(0.9);
    pointer-events: none;
}

.grid-cell.clicked-disappear {
    opacity: 0;
    transform: scale(0.3);
    pointer-events: none;
    background-color: transparent;
    box-shadow: none;
}

.grid-cell.wrong-click {
    animation: shake 0.3s ease-in-out;
    background-color: #e74c3c;
    color: white;
}

@keyframes shake {
    0%, 100% {
        transform: translateX(0);
    }
    25% {
        transform: translateX(-5px);
    }
    50% {
        transform: translateX(5px);
    }
    75% {
        transform: translateX(-5px);
    }
}

.hidden {
    display: none !important;
}

.invisible {
    display: none !important;
}

#result-panel {
    text-align: center;
    font-size: 1.5rem;
    padding: 15px;
    background: #e8f5e9;
    color: #2c3e50;
    border-radius: 12px;
    width: 100%;
    box-shadow: 0 4px 15px rgba(76, 175, 80, 0.2);
    border: 1px solid #4CAF50;
    margin: 20px 0;
}

#result-panel #final-time {
    color: #4CAF50;
    font-weight: bold;
}

.settings-panel {
    background: var(--container-bg-color);
    padding: 25px;
    border-radius: 16px;
    box-shadow: var(--panel-shadow);
    width: 100%;
    max-width: 380px;
    height: fit-content;
    transition: opacity var(--transition-duration) ease, transform var(--transition-duration) ease, visibility var(--transition-duration) ease;
    flex-shrink: 0;
    overflow-y: auto; /* prevent overflow */
    max-height: 90vh;
}

.layout-hidden {
    display: none !important;
}

.visually-hidden {
    visibility: hidden;
    opacity: 0;
    transform: translateX(30px);
    pointer-events: none;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--cell-border-color);
}

.panel-header h2 {
    margin: 0;
    color: var(--text-color);
    font-size: 1.5rem;
    transition: none;
}

#close-settings-btn {
    background: #95a5a6;
    color: white;
    border: none;
    border-radius: 50%;
    width: 32px;
    height: 32px;
    font-size: 1.1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

#close-settings-btn:hover {
    background: #7f8c8d;
    transform: scale(1.1);
}

.settings-content {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

fieldset {
    border: 1px solid var(--cell-border-color);
    border-radius: 8px;
    padding: 15px;
    margin: 0;
}

legend {
    font-weight: 600;
    color: var(--accent-color);
    padding: 0 8px;
    font-size: 1rem;
}

.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    font-size: 0.95rem;
}

.setting-item:last-child {
    margin-bottom: 0;
}

.setting-item label {
    font-weight: 500;
    flex: 1;
    color: var(--text-color);
    padding-right: 10px;
}

.setting-item input,
.setting-item select {
    padding: 8px;
    border-radius: 6px;
    border: 1px solid #ccc;
    background: white;
    font-size: 0.9rem;
    transition: none;
}

.setting-item input[type="color"] {
    width: 40px;
    height: 34px;
    padding: 2px;
    cursor: pointer;
    border: none;
    background: none;
}

.setting-item input[type="range"] {
    width: 120px;
    cursor: pointer;
}

.setting-item input[type="number"] {
    width: 60px;
    text-align: center;
}

.setting-item input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: var(--accent-color);
}

.color-settings-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px 20px;
}

.color-settings-grid .setting-item label {
    padding-right: 5px;
}

.preset-label {
    display: inline-block;
    background: var(--accent-color);
    color: white;
    padding: 2px 8px;
    border-radius: 15px;
    font-size: 0.75rem;
    margin-left: 5px;
    vertical-align: middle;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.6s ease 0.1s forwards;
    opacity: 0;
}

/* Leaderboard */
.leaderboard-container {
    margin-top: 10px;
    text-align: left;
    background: rgba(0,0,0,0.02);
    border: 1px solid rgba(0,0,0,0.05);
    padding: 10px 15px;
    border-radius: 8px;
}

.leaderboard-container h3 {
    margin: 0 0 8px;
    font-size: 1.1rem;
    color: var(--accent-color);
}

#leaderboard-list {
    margin: 0;
    padding-left: 20px;
    font-size: 0.95rem;
}
#leaderboard-list li {
    margin-bottom: 4px;
}

@media (max-width: 960px) {
    .app-container {
        flex-direction: column;
        align-items: center;
        gap: var(--panel-gap-mobile);
    }

    .settings-panel,
    .main-container {
        max-width: 550px;
    }

    .color-settings-grid {
        grid-template-columns: 1fr;
    }

    .visually-hidden {
        transform: translateY(30px);
    }

    .settings-panel {
        max-height: 70vh;
    }
}

@media (max-width: 600px) {
    :root {
        --font-size-base: 18px;
        --grid-gap: 5px;
    }

    h1 {
        font-size: 1.8rem;
    }

    .controls {
        width: 100%;
        gap: 10px;
    }

    .control-btn {
        flex-grow: 1;
        padding: 10px 15px;
        font-size: 0.95rem;
    }

    .main-container,
    .settings-panel {
        padding: 20px;
    }

    /* game-info layout for mobile */
    .game-info {
        font-size: 1rem;
        display: grid;
        grid-template-columns: 1fr 1fr;
        text-align: center;
        padding: 8px;
    }

    .game-info span:nth-child(3) {
        grid-column: span 2; /* Make "Next" span full width */
    }

    .grid-cell {
        border-radius: 6px;
    }

    #grid-container {
        max-width: 90vw;
        padding: var(--grid-gap);
    }
}

@media (max-width: 400px) {
    :root {
        --font-size-base: 16px;
    }

    .game-info {
        font-size: 0.9rem;
    }
}

/* 无动画 / Reduced motion */
@media (prefers-reduced-motion: reduce) {
    * {
        transition: none !important;
        animation-duration: 0s !important;
    }
}