:root {
    --primary-color: #4CAF50;
    --primary-dark: #388E3C;
    --bg-grad-start: #E0F7FA;
    --bg-grad-end: #FCE4EC;
    --text-color: #333;
    --white: #FFF;
    --btn-shadow: 0 4px 0 var(--primary-dark);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    touch-action: manipulation;
}

body {
    font-family: 'M PLUS Rounded 1c', sans-serif;
    background: linear-gradient(135deg, var(--bg-grad-start), var(--bg-grad-end));
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    overflow: hidden;
    user-select: none;
    -webkit-user-select: none;
}

#app-container {
    width: 100%;
    max-width: 100%;
    /* 全画面へ拡張 */
    height: 100vh;
    background-color: rgba(255, 255, 255, 0.4);
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
    position: relative;
    overflow: hidden;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
}

.screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    visibility: hidden;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.screen.active {
    visibility: visible;
    opacity: 1;
}

/* Title Screen */
.title-text {
    font-size: 3rem;
    color: var(--primary-dark);
    text-align: center;
    margin-top: 10vh;
    text-shadow: 2px 2px 4px rgba(255, 255, 255, 0.8);
    line-height: 1.3;
}

.character-img {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
    margin: 20px 0;
    border: 6px solid var(--white);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.menu-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 30px;
    width: 90%;
    max-width: 600px;
}

.game-mode-section {
    background: rgba(255, 255, 255, 0.6);
    padding: 20px;
    border-radius: 20px;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.05);
}

.mode-title {
    font-size: 1.4rem;
    font-weight: bold;
    color: var(--primary-dark);
    margin-bottom: 15px;
}

.level-btn-container {
    display: flex;
    gap: 15px;
    justify-content: center;
    width: 100%;
}

.level-btn {
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    border-radius: 12px;
    padding: 15px 20px;
    font-size: 1.2rem;
    font-weight: bold;
    font-family: inherit;
    cursor: pointer;
    box-shadow: 0 4px 0 var(--primary-dark);
    transition: transform 0.1s;
    flex: 1;
}

.level-btn:active {
    transform: translateY(4px);
    box-shadow: none;
}

.menu-btn,
.back-btn {
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    border-radius: 20px;
    padding: 15px 40px;
    font-size: 1.6rem;
    font-weight: bold;
    font-family: 'M PLUS Rounded 1c', sans-serif;
    cursor: pointer;
    box-shadow: var(--btn-shadow);
    transition: transform 0.1s;
    line-height: 1.2;
}

.menu-btn:active,
.back-btn:active {
    transform: translateY(4px);
    box-shadow: none;
}

.furigana {
    display: block;
    font-size: 1rem;
    font-weight: normal;
    margin-top: 5px;
}

/* Game Screens Header */
.header {
    width: 100%;
    display: flex;
    align-items: center;
    padding: 20px;
    background-color: rgba(255, 255, 255, 0.7);
    border-bottom: 2px solid rgba(0, 0, 0, 0.05);
}

.back-btn {
    font-size: 1.2rem;
    padding: 12px 24px;
    border-radius: 16px;
}

.header h2 {
    font-size: 1.8rem;
    margin-left: 15px;
    color: var(--primary-dark);
    flex-grow: 1;
    text-align: center;
}

.level-info {
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: var(--primary-color);
    color: white;
    padding: 5px 15px;
    border-radius: 12px;
    margin-left: 10px;
    min-width: 90px;
    box-shadow: inset 0 -2px 0 rgba(0, 0, 0, 0.1);
}

.level-text {
    font-size: 1.1rem;
    font-weight: bold;
}

.progress-text {
    font-size: 0.9rem;
    opacity: 0.9;
}

/* Game Areas */
.game-area {
    flex-grow: 1;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px 20px 0 20px;
    overflow-y: auto;
}

/* Footer Advice Area */
.character-footer {
    width: 100%;
    display: flex;
    align-items: center;
    padding: 10px 20px;
    background-color: rgba(255, 255, 255, 0.9);
    border-top: 2px solid rgba(0, 0, 0, 0.1);
    z-index: 50;
    box-shadow: 0 -4px 10px rgba(0, 0, 0, 0.05);
}

.footer-character-img {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    border: 3px solid var(--white);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
    margin-right: 20px;
    object-fit: cover;
}

.footer-speech-bubble {
    position: relative;
    background: #FFF;
    border: 3px solid #FFC107;
    border-radius: 12px;
    padding: 15px 25px;
    font-size: 1.4rem;
    font-weight: bold;
    color: #333;
    flex-grow: 1;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.footer-speech-bubble::before {
    content: '';
    position: absolute;
    left: -12px;
    top: 50%;
    transform: translateY(-50%);
    border-width: 8px 12px 8px 0;
    border-style: solid;
    border-color: transparent #FFC107 transparent transparent;
}

.footer-speech-bubble::after {
    content: '';
    position: absolute;
    left: -8px;
    top: 50%;
    transform: translateY(-50%);
    border-width: 6px 9px 6px 0;
    border-style: solid;
    border-color: transparent #FFF transparent transparent;
}

/* Modal Styles */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    opacity: 1;
    transition: opacity 0.3s;
}

.modal-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.modal-content {
    background-color: var(--white);
    padding: 30px;
    border-radius: 24px;
    display: flex;
    flex-direction: column;
    align-items: center;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
    max-width: 90%;
    width: 400px;
    transform: scale(1);
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.modal-overlay.hidden .modal-content {
    transform: scale(0.8);
}

.modal-character-img {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    border: 4px solid var(--primary-color);
    margin-bottom: -20px;
    z-index: 2;
    background-color: var(--white);
}

.modal-speech-bubble {
    background: #FFF;
    border: 3px solid #03A9F4;
    border-radius: 16px;
    padding: 20px;
    font-size: 1.6rem;
    font-weight: bold;
    color: #333;
    text-align: center;
    width: 100%;
    margin-bottom: 20px;
    line-height: 1.4;
    position: relative;
}

.modal-btn {
    background-color: #FF9800;
    color: var(--white);
    border: none;
    border-radius: 16px;
    padding: 15px 40px;
    font-size: 1.4rem;
    font-weight: bold;
    font-family: inherit;
    cursor: pointer;
    box-shadow: 0 4px 0 #F57C00;
}

.modal-btn:active {
    transform: translateY(4px);
    box-shadow: none;
}

/* Settings Styles */
.settings-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    background-color: var(--white);
    color: #666;
    border: 2px solid #CCC;
    border-radius: 12px;
    padding: 10px 15px;
    font-size: 1.2rem;
    font-weight: bold;
    font-family: inherit;
    cursor: pointer;
    box-shadow: 0 4px 0 #CCC;
    z-index: 100;
}

.settings-btn:active {
    transform: translateY(4px);
    box-shadow: none;
}

.settings-content {
    width: 450px;
}

.settings-content h2 {
    color: var(--primary-dark);
    margin-bottom: 20px;
    font-size: 1.8rem;
}

.settings-section {
    width: 100%;
    margin-bottom: 25px;
    background: #f9f9f9;
    padding: 15px;
    border-radius: 16px;
}

.settings-section h3 {
    margin-bottom: 10px;
    color: #666;
    font-size: 1.2rem;
}

.color-options {
    display: flex;
    justify-content: center;
    gap: 15px;
}

.color-option {
    cursor: pointer;
}

.color-option input[type="radio"] {
    display: none;
}

.color-swatch {
    display: block;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: 3px solid transparent;
    transition: all 0.2s;
}

.color-option input[type="radio"]:checked+.color-swatch {
    border-color: #333;
    transform: scale(1.1);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.mode-options {
    display: flex;
    justify-content: center;
    gap: 15px;
}

.mode-option {
    cursor: pointer;
    background: #FFF;
    border: 2px solid #CCC;
    padding: 10px 20px;
    border-radius: 12px;
    font-size: 1.2rem;
    font-weight: bold;
    transition: all 0.2s;
}

.mode-option input[type="radio"] {
    display: none;
}

.mode-option input[type="radio"]:checked+span {
    color: var(--primary-color);
}

.mode-option:has(input[type="radio"]:checked) {
    border-color: var(--primary-color);
    background: #E8F5E9;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

/* Step 5 Styles */
.target-container {
    /* 端末画面に合わせて最大サイズへ拡大 (幅/高さを最大化) */
    width: clamp(160px, 30vmin, 320px);
    height: clamp(160px, 30vmin, 320px);
    background-color: var(--white);
    border-radius: 20px;
    padding: clamp(5px, 2vmin, 15px);
    margin-bottom: clamp(10px, 4vmin, 40px);
    border: 4px solid var(--primary-color);
    position: relative;
    /* For animation anchor */
    z-index: 10;
}

.choices-container {
    display: flex;
    gap: clamp(10px, 3vmin, 40px);
    justify-content: center;
    flex-wrap: wrap;
    width: 100%;
    position: relative;
}

.choice-btn {
    width: clamp(160px, 30vmin, 320px);
    height: clamp(160px, 30vmin, 320px);
    flex-shrink: 0;
    background-color: rgba(255, 255, 255, 0.4);
    /* 透明なカード風 */
    backdrop-filter: blur(2px);
    border: 3px solid rgba(0, 0, 0, 0.15);
    /* クリアファイルのフチのような表現 */
    border-radius: 8px;
    /* カードらしく少し角を立たせる */
    padding: clamp(5px, 2vmin, 15px);
    cursor: grab;
    touch-action: none;
    box-shadow: 2px 4px 8px rgba(0, 0, 0, 0.1);
    transition: all 0.3s;
    position: relative;
    z-index: 5;
}

.choice-btn:active,
.choice-btn.dragging {
    cursor: grabbing;
    transform: scale(0.98);
    box-shadow: 4px 8px 16px rgba(0, 0, 0, 0.15);
    /* 持ち上げている感じ */
    background-color: rgba(255, 255, 255, 0.5);
    /* 持ち上げ中は少し白く */
    backdrop-filter: blur(0px);
    /* 持ち上げ中はクリアに */
}

.choice-btn.correct {
    border-color: var(--primary-color);
    background-color: #E8F5E9;
    transform: scale(1.0) !important;
    z-index: 20;
    transition: all 0.2s;
    /* Snap instantly */
}

.choice-btn.wrong {
    animation: shake 0.4s;
    border-color: #F44336;
    background-color: #FFEBEE;
}

@keyframes shake {
    0% {
        transform: translateX(0);
    }

    25% {
        transform: translateX(-5px);
    }

    50% {
        transform: translateX(5px);
    }

    75% {
        transform: translateX(-5px);
    }

    100% {
        transform: translateX(0);
    }
}

/* Confetti Effect */
.confetti {
    position: fixed;
    width: 12px;
    height: 12px;
    top: -20px;
    z-index: 9999;
    animation: fall linear forwards;
    pointer-events: none;
}

@keyframes fall {
    to {
        transform: translateY(110vh) rotate(720deg);
    }
}

/* Step 6 Styles */
.step6-model-container {
    width: clamp(160px, 30vmin, 320px);
    height: clamp(160px, 30vmin, 320px);
    background-color: rgba(255, 255, 255, 0.8);
    border: 4px dashed #999;
    border-radius: 20px;
    padding: clamp(5px, 2vmin, 15px);
    margin-bottom: clamp(10px, 4vmin, 40px);
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.step6-model-container::before {
    content: "みほん";
    position: absolute;
    top: -30px;
    font-size: 1.2rem;
    font-weight: bold;
    color: #666;
}

.interactive-piece-container {
    width: clamp(160px, 30vmin, 320px);
    height: clamp(160px, 30vmin, 320px);
    background-color: var(--white);
    border-radius: 20px;
    padding: clamp(5px, 2vmin, 15px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
    border: 4px solid var(--primary-color);
    cursor: pointer;
    transition: transform 0.1s;
    position: relative;
    /* Add position relative for the handle */
}

/* Rotation Handle (for drag mode) */
.rotation-handle {
    position: absolute;
    top: -20px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 40px;
    background-color: #FF9800;
    border-radius: 50%;
    border: 3px solid #FFF;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
    display: none;
    /* Hidden by default, shown in drag mode */
    justify-content: center;
    align-items: center;
    cursor: grab;
    z-index: 20;
}

.rotation-handle::after {
    content: "↻";
    color: white;
    font-size: 20px;
    font-weight: bold;
}

.rotation-handle:active {
    cursor: grabbing;
}

/* Show the handle in drag mode via dataset or class on piece container */
.interactive-piece-container[data-mode="drag"] .rotation-handle,
.choice-btn[data-mode="drag"] .rotation-handle {
    display: flex;
}

.interactive-piece-container:active {
    transform: scale(0.98);
}

.interactive-piece-container.correct {
    border-color: #4CAF50;
    background-color: #E8F5E9;
    animation: correct-pulse 0.5s;
    pointer-events: none;
    /* 正解後は触れない */
}

@keyframes correct-pulse {
    0% {
        transform: scale(1);
        box-shadow: 0 0 0 rgba(76, 175, 80, 0.7);
    }

    70% {
        transform: scale(1.05);
        box-shadow: 0 0 20px rgba(76, 175, 80, 0.7);
    }

    100% {
        transform: scale(1);
        box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
    }
}

/* Step 7 Styles */
#step7-target-container {
    width: clamp(160px, 30vmin, 320px);
    height: clamp(160px, 30vmin, 320px);
    background-color: var(--white);
    border-radius: 20px;
    padding: clamp(5px, 2vmin, 15px);
    margin-bottom: clamp(10px, 4vmin, 40px);
    border: 4px solid var(--primary-color);
    position: relative;
    z-index: 10;
}

#step7-choices-container {
    display: flex;
    gap: clamp(10px, 3vmin, 40px);
    justify-content: center;
    flex-wrap: wrap;
    width: 100%;
    position: relative;
}

.rail-board {
    background-color: #81C784;
    /* 草原の色 */
    border: 6px solid var(--primary-dark);
    border-radius: 12px;
    margin-bottom: 30px;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
}

.board-cell {
    width: 100px;
    height: 100px;
    border: 1px dashed rgba(255, 255, 255, 0.4);
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.empty-slot {
    background-color: rgba(0, 0, 0, 0.15);
    box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.3);
}

.pieces-container {
    width: 100%;
    height: 120px;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: rgba(255, 255, 255, 0.6);
    border-radius: 20px;
    position: relative;
}

.draggable-piece {
    width: 100px;
    height: 100px;
    cursor: grab;
    touch-action: none;
    filter: drop-shadow(0 4px 6px rgba(0, 0, 0, 0.3));
    position: relative;
    /* Before dragging */
}

.draggable-piece:active {
    cursor: grabbing;
}

.rail-tile {
    transition: transform 0.2s ease;
    pointer-events: none;
    /* Let drag wrapper handle events */
}

/* Keep everything responsive */
@media (max-width: 600px) {
    .title-text {
        font-size: 2.2rem;
    }

    .menu-container {
        flex-direction: column;
        align-items: center;
    }

    .menu-btn {
        font-size: 1.4rem;
        width: 100%;
    }

    .header h2 {
        font-size: 1.4rem;
    }

    .footer-speech-bubble {
        font-size: 1.1rem;
        padding: 10px 15px;
    }

    .footer-character-img {
        width: 60px;
        height: 60px;
        margin-right: 15px;
    }
}

@media (max-width: 400px) {
    .title-text {
        font-size: 1.8rem;
    }

    .menu-btn {
        font-size: 1.2rem;
    }

    .header h2 {
        font-size: 1.1rem;
    }

    .footer-speech-bubble {
        font-size: 1.0rem;
    }
}