:root {
    --primary-color: #4CAF50;
    --secondary-color: #8BC34A;
    --accent-color: #FFC107;
    --bg-color: #E8F5E9;
    --rail-color: #9E9E9E;
    --rail-accent: #795548;
    --text-color: #333;
    --train-color: #F44336;
    --station-color: #2196F3;
}

* {
    box-sizing: border-box;
    user-select: none;
    touch-action: none;
}

body {
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, #a8edea, #fed6e3);
    font-family: 'Hiragino Maru Gothic ProN', 'Rounded M+ 1c', sans-serif;
    color: var(--text-color);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

#app-container {
    width: 100%;
    max-width: 1024px;
    height: 100%;
    max-height: 768px;
    border-radius: 24px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
    position: relative;
    overflow: hidden;
}

/* ============================
   画面切り替え共通
============================= */
.screen {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.screen.active {
    opacity: 1;
    pointer-events: auto;
}

/* ============================
   トップ画面
============================= */
#screen-top {
    background: linear-gradient(160deg, #f9fff9 0%, #e8f5e9 100%);
    align-items: center;
    justify-content: center;
    padding: 30px 20px;
    gap: 20px;
}

.top-header {
    text-align: center;
}

.top-okojo {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    overflow: hidden;
    animation: bob 2.5s infinite ease-in-out;
    display: inline-block;
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.15);
    border: 4px solid white;
    box-sizing: content-box;
}

.top-okojo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.top-header h1 {
    margin: 10px 0 4px;
    font-size: 2rem;
    color: var(--primary-color);
    line-height: 1.3;
    text-shadow: 0 2px 0 rgba(0, 0, 0, 0.07);
}

.top-sub {
    margin: 0;
    font-size: 1.1rem;
    color: #777;
}

.step-cards {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    justify-content: center;
}

.step-card {
    background: linear-gradient(145deg, #ffffff 0%, #f5fff5 100%);
    border: 2px solid rgba(76, 175, 80, 0.15);
    border-radius: 22px;
    padding: 20px 14px 16px;
    width: 140px;
    cursor: pointer;
    box-shadow: 0 4px 18px rgba(0, 0, 0, 0.08);
    transition: transform 0.18s, box-shadow 0.18s, border-color 0.18s;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.step-card:hover,
.step-card:active {
    transform: translateY(-5px) scale(1.05);
    box-shadow: 0 12px 32px rgba(76, 175, 80, 0.2);
    border-color: var(--primary-color);
}

.card-icon {
    font-size: 40px;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 48px;
    height: 48px;
}

.card-label {
    font-size: 1rem;
    font-weight: bold;
    color: var(--primary-color);
    line-height: 1.4;
}

.card-label span {
    font-size: 0.75rem;
    font-weight: normal;
    color: #555;
}

/* ============================
   ゲーム画面
============================= */
#screen-game {
    background: #fff;
}

header {
    background: var(--primary-color);
    color: white;
    padding: 12px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    z-index: 10;
}

#btn-home {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    padding: 8px 14px;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: background 0.2s;
}

#btn-home:hover {
    background: rgba(255, 255, 255, 0.35);
}

#step-indicator {
    background: rgba(255, 255, 255, 0.2);
    padding: 6px 20px;
    border-radius: 20px;
    font-weight: bold;
    font-size: 1.05rem;
}

#play-area {
    flex: 1;
    position: relative;
    background: #F1F8E9;
    overflow: hidden;
}

#game-svg {
    display: block;
    width: 100%;
    height: 100%;
    cursor: crosshair;
}

.rail-path {
    fill: none;
    stroke: var(--rail-color);
    stroke-width: 20;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.rail-ties {
    fill: none;
    stroke: var(--rail-accent);
    stroke-width: 10;
    stroke-dasharray: 10 20;
    stroke-linecap: butt;
}

.train {
    cursor: pointer;
}

.train.active {
    /* CSS transform: scale() は SVG transform属性と競合するため使用しない */
    filter: drop-shadow(0 4px 12px rgba(255, 100, 0, 0.5));
}

.station {
    fill: var(--station-color);
    stroke: #ffffff;
    stroke-width: 4;
}

footer {
    background: #fff;
    padding: 12px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 2px solid #eee;
    z-index: 10;
}

#okojo-guide {
    display: flex;
    align-items: center;
    gap: 12px;
}

.okojo-avatar {
    width: 64px;
    height: 64px;
    background: #fff;
    border-radius: 50%;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
    border: 3px solid #fff;
    animation: bob 2s infinite ease-in-out;
    flex-shrink: 0;
}

.okojo-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

@keyframes bob {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-5px);
    }
}

.speech-bubble {
    background: #fff;
    border: 3px solid var(--accent-color);
    padding: 10px 18px;
    border-radius: 20px;
    font-size: 1.1rem;
    font-weight: bold;
    position: relative;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: transform 0.15s;
}

.speech-bubble::before {
    content: '';
    position: absolute;
    left: -12px;
    top: 50%;
    transform: translateY(-50%);
    border-width: 10px 15px 10px 0;
    border-style: solid;
    border-color: transparent var(--accent-color) transparent transparent;
}

.speech-bubble::after {
    content: '';
    position: absolute;
    left: -8px;
    top: 50%;
    transform: translateY(-50%);
    border-width: 8px 12px 8px 0;
    border-style: solid;
    border-color: transparent #fff transparent transparent;
}

@keyframes success-pulse {
    0% {
        filter: drop-shadow(0 0 0 rgba(255, 193, 7, 0.8));
    }

    50% {
        filter: drop-shadow(0 0 20px rgba(255, 193, 7, 0.8));
    }

    100% {
        filter: drop-shadow(0 0 0 rgba(255, 193, 7, 0));
    }
}

.success-fx {
    animation: success-pulse 1s ease-out;
}

.corner-indicator {
    fill: rgba(255, 193, 7, 0.5);
    stroke: var(--accent-color);
    stroke-width: 4;
    cursor: pointer;
    animation: corner-pulse 0.8s infinite alternate;
    pointer-events: auto;
}

@keyframes corner-pulse {
    0% {
        r: 25px;
        opacity: 0.8;
    }

    100% {
        r: 40px;
        opacity: 0.2;
    }
}

.rotate-handle {
    fill: #fff;
    stroke: var(--primary-color);
    stroke-width: 3;
    cursor: grab;
}

.rotate-handle:active {
    cursor: grabbing;
    fill: #f1f8e9;
}

/* ============================
   歯車ボタン
============================= */
.settings-gear {
    position: absolute;
    top: 16px;
    right: 16px;
    z-index: 20;
    background: rgba(255, 255, 255, 0.85);
    border: 2px solid rgba(76, 175, 80, 0.25);
    border-radius: 50%;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: #4CAF50;
    box-shadow: 0 3px 12px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s, box-shadow 0.2s;
}

.settings-gear:hover {
    transform: rotate(30deg) scale(1.1);
    box-shadow: 0 5px 18px rgba(0, 0, 0, 0.15);
}

/* ============================
   設定モーダル
============================= */
.settings-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
    animation: fade-in 0.2s ease;
}

.settings-overlay.hidden {
    display: none;
}

.settings-card {
    background: #fff;
    border-radius: 28px;
    padding: 30px 36px;
    width: 90%;
    max-width: 420px;
    box-shadow: 0 12px 48px rgba(0, 0, 0, 0.25);
    animation: pop-in 0.25s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.settings-card h2 {
    text-align: center;
    font-size: 1.5rem;
    color: var(--primary-color);
    margin: 0 0 20px;
}

.settings-section {
    margin-bottom: 20px;
}

.settings-section-label {
    display: block;
    font-size: 0.95rem;
    font-weight: bold;
    color: var(--text-color);
    margin-bottom: 10px;
}

.round-buttons {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.round-btn {
    padding: 8px 16px;
    border: 2px solid var(--primary-color);
    border-radius: 20px;
    background: #fff;
    color: var(--primary-color);
    font-size: 0.9rem;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.18s;
}

.round-btn.active {
    background: var(--primary-color);
    color: #fff;
    transform: scale(1.08);
}

.round-btn:hover {
    background: var(--secondary-color);
    color: #fff;
    border-color: var(--secondary-color);
}

/* カラーパレット */
.color-palette {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.color-swatch {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    border: 3px solid transparent;
    cursor: pointer;
    transition: transform 0.15s, border-color 0.15s, box-shadow 0.15s;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
}

.color-swatch:hover {
    transform: scale(1.15);
}

.color-swatch.active {
    border-color: var(--text-color);
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.15), 0 3px 8px rgba(0, 0, 0, 0.2);
    transform: scale(1.12);
}

.settings-close-btn {
    display: block;
    width: 100%;
    padding: 12px;
    background: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: 16px;
    font-size: 1.05rem;
    font-family: inherit;
    font-weight: bold;
    cursor: pointer;
    margin-top: 8px;
    transition: background 0.2s;
}

.settings-close-btn:hover {
    background: var(--secondary-color);
}

/* ============================
   クリア後オーバーレイ
============================= */
.clear-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    animation: fade-in 0.25s ease;
}

.clear-overlay.hidden {
    display: none;
}

.clear-card {
    background: #fff;
    border-radius: 24px;
    padding: 32px 40px;
    text-align: center;
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.25);
    animation: pop-in 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.clear-emoji {
    font-size: 3rem;
    margin-bottom: 8px;
}

.clear-message {
    font-size: 1.6rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 6px;
}

.clear-progress {
    font-size: 1rem;
    color: #888;
    margin-bottom: 20px;
}

.clear-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
}

.clear-btn {
    padding: 12px 28px;
    border: none;
    border-radius: 18px;
    font-size: 1.05rem;
    font-family: inherit;
    cursor: pointer;
    transition: transform 0.15s;
}

.clear-btn:active {
    transform: scale(0.96);
}

.continue-btn {
    background: var(--primary-color);
    color: #fff;
    font-weight: bold;
}

.back-btn {
    background: #eee;
    color: #555;
}

@keyframes fade-in {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes pop-in {
    from {
        transform: scale(0.8);
        opacity: 0;
    }

    to {
        transform: scale(1);
        opacity: 1;
    }
}