:root {
    /* ライトモードのデフォルトカラー変数を定義 */
    --bg-color-light: #f5f5f5;
    --text-color-light: #333;
    --container-bg-light: white;
    --header-text-light: #408a5c; 
    --timer-text-light: #408a5c;
    --status-text-light: #408a5c;
    --input-border-light: #ddd;
    --input-bg-light: white;
    --input-text-light: #333;
    --btn-primary-bg-light: #408a5c;
    --btn-primary-text-light: white; 
    --btn-primary-hover-bg-light: #2c6e4a; 
    --btn-reset-bg-light: #ca4f4f;
    --btn-reset-text-light: white;
    --btn-reset-hover-bg-light: #e0e0e0; 
    --btn-secondary-bg-light: #6c757d; 
    --btn-secondary-text-light: white;
    --btn-secondary-hover-bg-light: #5a6268;
    --btn-bgm-on-bg-light: #3082d6; 
    --btn-bgm-on-text-light: white; 
    --indicator-dot-color-light: #ccc;
    --indicator-dot-active-color-light: var(--header-text-light);
    --heart-empty-color-light: #ccc;
    --heart-filled-color-light: #ff69b4; /* ピンク系 */
    /* ★追加: 空ハートの影の色 */
    --heart-empty-shadow-light: rgba(0, 0, 0, 0.2);


    /* ダークモードのカラー変数を定義 */
    --bg-color-dark: #121212;
    --text-color-dark: #e0e0e0;
    --container-bg-dark: #1e1e1e;
    --header-text-dark: #69b884; 
    --timer-text-dark: #69b884;
    --status-text-dark: #69b884;
    --input-border-dark: #555;
    --input-bg-dark: #2a2a2a;
    --input-text-dark: #e0e0e0;
    --btn-primary-bg-dark: #52a871; 
    --btn-primary-text-dark: white; 
    --btn-primary-hover-bg-dark: #3f8c5e;
    --btn-reset-bg-dark: #c76161; 
    --btn-reset-text-dark: white;
    --btn-reset-hover-bg-dark: #a54343; 
    --btn-secondary-bg-dark: #495057; 
    --btn-secondary-text-dark: #e0e0e0;
    --btn-secondary-hover-bg-dark: #5a6268;
    --btn-bgm-on-bg-dark: #3082d6;  
    --btn-bgm-on-text-dark: white; 
    --indicator-dot-color-dark: #555;
    --indicator-dot-active-color-dark: var(--header-text-dark);
    --heart-empty-color-dark: #555;
    --heart-filled-color-dark: #ff85c0; /* やや明るめのピンク系 */
    /* ★追加: 空ハートの影の色 (ダークモード) */
    --heart-empty-shadow-dark: rgba(255, 255, 255, 0.15);


    /* プログレスバーの色 */
    --progress-work-color: #408a5c;
    --progress-break-color: #3082d6;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Noto Sans JP', sans-serif;
}

body {
    background-color: var(--bg-color-light);
    color: var(--text-color-light);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
    position: relative; 
    overflow-x: hidden; 
}

.container {
    max-width: 600px; 
    margin: 0 auto;
    padding: 1rem; 
    text-align: center;
    position: relative; 
}

#hearts-container {
    position: absolute;
    top: 10px;
    left: 10px;
    display: flex;
    gap: 5px;
    font-size: 1.8rem; 
    z-index: 100;
}

#hearts-container span {
    color: var(--heart-empty-color-light);
    transition: color 0.3s ease, text-shadow 0.3s ease;
    /* ★変更: 空のハートに影を追加して視認性向上 */
    text-shadow: 0 0 1px var(--heart-empty-shadow-light), 0 0 3px var(--heart-empty-shadow-light);
}

#hearts-container span.filled {
    color: var(--heart-filled-color-light);
    text-shadow: none; /* 埋まったハートは影なし */
}

body.dark-mode #hearts-container span {
    color: var(--heart-empty-color-dark);
    text-shadow: 0 0 1px var(--heart-empty-shadow-dark), 0 0 3px var(--heart-empty-shadow-dark);
}
body.dark-mode #hearts-container span.filled {
    color: var(--heart-filled-color-dark);
    text-shadow: none;
}


header {
    position: relative;
    margin-bottom: 0.5rem; 
    height: 40px; 
    display: flex; 
    justify-content: flex-end; 
    align-items: center; 
}

.theme-btn {
    padding: 0.4rem 0.8rem; 
    font-size: 0.8rem;    
    font-weight: bold;
    border: 2px solid var(--header-text-light); 
    border-radius: 20px; 
    cursor: pointer;
    background-color: transparent;
    color: var(--header-text-light); 
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease, transform 0.15s ease;
}

.theme-btn:hover {
    background-color: var(--header-text-light); 
    color: var(--bg-color-light); 
}
.theme-btn:active {
    transform: scale(0.95); 
}

.character-section { 
    margin: 1rem 0;
    position: relative;
    display: flex; 
    flex-direction: column; 
    align-items: center; 
}

.character-display-area {
    display: flex; 
    align-items: center; 
    justify-content: center; 
    gap: 10px; /* ボタンとアイコンコンテナの間隔 */
    position: relative; 
}

.character-image-container {
    position: relative; 
    width: 190px; /* スライドマスクより少し小さく */
    height: 190px;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 0.5rem; 
    overflow: visible; /* ハートエフェクトが見えるように */
    border-radius: 50%;
    cursor: pointer; 
    transition: transform 0.15s ease-out; /* box-shadow の transition は削除 */
    /* ★変更: box-shadow を削除 */
    /* box-shadow: 0 2px 4px rgba(0,0,0,0.1);  */
}

.character-image-container:active {
    transform: scale(0.95); 
    /* ★変更: box-shadow を削除 */
    /* box-shadow: 0 1px 2px rgba(0,0,0,0.1);  */
}

#click-effects-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none; 
    overflow: hidden; 
    border-radius: 50%; 
}

.flying-heart {
    position: absolute;
    font-size: 2rem; 
    color: var(--heart-filled-color-light);
    animation: flyAndFade 0.8s ease-out forwards;
    pointer-events: none;
    opacity: 1;
    z-index: 5; 
}
body.dark-mode .flying-heart {
    color: var(--heart-filled-color-dark);
}

@keyframes flyAndFade {
    0% {
        transform: translate(-50%, -50%) scale(0.5);
        opacity: 1;
    }
    100% {
        transform: translate(-50%, -150px) scale(1.2); 
        opacity: 0;
    }
}


.character {
    max-width: 160px;
    height: auto;
    position: absolute; 
    z-index: 1; 
}


/* スライドアニメーションクラス */
.character.slide-out-left {
    animation: slideOutLeft 0.35s cubic-bezier(0.25, 0.1, 0.25, 1) forwards;
}
.character.slide-in-from-right {
    animation: slideInFromRight 0.35s cubic-bezier(0.25, 0.1, 0.25, 1) forwards;
}
.character.slide-out-right {
    animation: slideOutRight 0.35s cubic-bezier(0.25, 0.1, 0.25, 1) forwards;
}
.character.slide-in-from-left {
    animation: slideInFromLeft 0.35s cubic-bezier(0.25, 0.1, 0.25, 1) forwards;
}

/* translateX の値を調整して、マスク範囲内で収まるようにする */
/* 例: コンテナ幅 190px, マスクエリア幅 210px の場合、 translateX は +/- 105px 程度で隠れる */
@keyframes slideOutLeft {
    from { transform: translateX(0) scale(1); opacity: 1; }
    to { transform: translateX(-110%) scale(1); opacity: 0; } /* 少し大きめに移動して確実に隠す */
}
@keyframes slideInFromRight {
    from { transform: translateX(110%) scale(1); opacity: 0; }
    to { transform: translateX(0) scale(1); opacity: 1; }
}
@keyframes slideOutRight {
    from { transform: translateX(0) scale(1); opacity: 1; }
    to { transform: translateX(110%) scale(1); opacity: 0; }
}
@keyframes slideInFromLeft {
    from { transform: translateX(-110%) scale(1); opacity: 0; }
    to { transform: translateX(0) scale(1); opacity: 1; }
}


.progress-ring {
    position: absolute;
    width: 200px;
    height: 200px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) rotate(-90deg);
    z-index: 2; 
    pointer-events: none; 
}

.progress-ring-circle {
    transition: stroke-dashoffset 0.35s, stroke 0.35s;
}

.character-indicator {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px; 
    margin-top: 0px; 
    margin-bottom: 0.5rem; 
}

.indicator-dot {
    width: 10px; 
    height: 10px; 
    border-radius: 50%;
    background-color: var(--indicator-dot-color-light);
    transition: background-color 0.3s ease;
}

.indicator-dot.active {
    background-color: var(--indicator-dot-active-color-light);
}


.character-nav-btn {
    background-color: transparent;
    border: none; 
    color: var(--header-text-light);
    padding: 0.5rem; 
    font-size: 1.5rem; 
    line-height: 1;
    border-radius: 50%;
    cursor: pointer;
    transition: color 0.3s ease, transform 0.15s ease; 
    width: 40px; 
    height: 40px; 
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10; /* スライドアニメーションより手前に表示 */
}
.character-nav-btn:active {
    transform: scale(0.90); 
}


.status {
    font-size: 1.5rem; 
    font-weight: bold;
    color: var(--status-text-light);
    transition: color 0.3s ease;
    text-align: center; 
}

.timer-display {
    font-size: 3.5rem; 
    font-weight: bold;
    margin: 0.7rem 0;
    color: var(--timer-text-light);
    font-family: 'Courier New', monospace;
}

.controls {
    background-color: var(--container-bg-light); 
    padding: 1rem; 
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    margin-top: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1rem; 
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.time-controls {
    display: flex;
    justify-content: space-around; 
    gap: 1rem; 
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.time-setting {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex-basis: calc(50% - 0.5rem); 
    max-width: calc(50% - 0.5rem);
}

.time-setting label {
    margin-bottom: 0.3rem; 
    font-weight: bold;
    font-size: 0.9em;
}

.time-setting select {
    width: 100px; 
    padding: 0.6rem; 
    border: 2px solid var(--input-border-light);
    border-radius: 5px;
    text-align: center;
    font-size: 0.9rem;
    background-color: var(--input-bg-light);
    color: var(--input-text-light);
    -webkit-appearance: none; 
    -moz-appearance: none;    
    appearance: none;         
    background-image: url('data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%23007CB2%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E');
    background-repeat: no-repeat;
    background-position: right 0.7em top 50%, 0 0;
    background-size: 0.65em auto, 100%;
    cursor: pointer;
}
body.dark-mode .time-setting select {
    border-color: var(--input-border-dark);
    background-color: var(--input-bg-dark);
    color: var(--input-text-dark);
    background-image: url('data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%23cccccc%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E');
}


.volume-controls {
    display: flex;
    justify-content: space-around; 
    align-items: flex-start; 
    gap: 1rem; 
    flex-wrap: wrap; 
    margin-top: 1rem; 
}

.volume-setting {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.3rem; 
}

.volume-setting label {
    font-weight: bold;
    color: var(--text-color-light); 
    transition: color 0.3s ease;
    font-size: 0.9em;
}

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

.volume-setting span { 
    font-size: 0.8em; 
    min-width: 35px;
    text-align: center;
    color: var(--text-color-light); 
    transition: color 0.3s ease;
}

.buttons {
    display: flex;
    justify-content: center;
    gap: 0.8rem; 
    margin-top: 1rem;
    flex-wrap: wrap;
}

.btn {
    padding: 0.7rem 0; 
    min-width: 100px;  
    width: calc(33.333% - 0.53rem); 
    max-width: 150px; 
    font-size: 0.9rem; 
    border: none;
    border-radius: 20px; 
    cursor: pointer;
    transition: background-color 0.3s ease, color 0.3s ease, box-shadow 0.3s ease, transform 0.15s ease; 
    font-weight: bold;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1); 
    text-align: center; 
}
.btn:active {
    transform: scale(0.95); 
    box-shadow: 0 1px 2px rgba(0,0,0,0.1); 
}


#start-pause {
    background-color: var(--btn-primary-bg-light);
    color: var(--btn-primary-text-light); 
}
#start-pause:hover {
    background-color: var(--btn-primary-hover-bg-light);
}

#reset {
    background-color: var(--btn-reset-bg-light);
    color: var(--btn-reset-text-light);
}
#reset:hover {
    background-color: var(--btn-reset-hover-bg-light);
    color: var(--text-color-light); 
}

#toggle-bgm {
    background-color: var(--btn-secondary-bg-light); 
    color: var(--btn-secondary-text-light);
}
#toggle-bgm:hover {
    background-color: var(--btn-secondary-hover-bg-light);
}
#toggle-bgm.bgm-on {
    background-color: var(--btn-bgm-on-bg-light);
    color: var(--btn-bgm-on-text-light);
}


/* ダークモードのスタイル */
body.dark-mode {
    background-color: var(--bg-color-dark);
    color: var(--text-color-dark);
}
body.dark-mode .theme-btn {
    border-color: var(--header-text-dark);
    color: var(--header-text-dark);
}
body.dark-mode .theme-btn:hover {
    background-color: var(--header-text-dark);
    color: var(--btn-primary-text-dark); 
}

body.dark-mode .character-nav-btn {
    color: var(--header-text-dark);
}

body.dark-mode .indicator-dot {
    background-color: var(--indicator-dot-color-dark);
}
body.dark-mode .indicator-dot.active {
    background-color: var(--indicator-dot-active-color-dark);
}


body.dark-mode .status {
    color: var(--status-text-dark);
}
body.dark-mode .timer-display {
    color: var(--timer-text-dark);
}
body.dark-mode .controls {
    background-color: var(--container-bg-dark);
    box-shadow: 0 4px 8px rgba(255, 255, 255, 0.05);
}
body.dark-mode .time-setting label {
    color: var(--text-color-dark);
}
body.dark-mode .volume-setting label {
    color: var(--text-color-dark);
}
body.dark-mode .volume-setting span {
    color: var(--text-color-dark);
}

body.dark-mode #start-pause {
    background-color: var(--btn-primary-bg-dark);
    color: var(--btn-primary-text-dark); 
}
body.dark-mode #start-pause:hover {
    background-color: var(--btn-primary-hover-bg-dark);
}

body.dark-mode #reset {
    background-color: var(--btn-reset-bg-dark);
    color: var(--btn-reset-text-dark);
}
body.dark-mode #reset:hover {
    background-color: var(--btn-reset-hover-bg-dark);
}

body.dark-mode #toggle-bgm { 
    background-color: var(--btn-secondary-bg-dark);
    color: var(--btn-secondary-text-dark);
}
body.dark-mode #toggle-bgm:hover {
    background-color: var(--btn-secondary-hover-bg-dark);
}

body.dark-mode #toggle-bgm.bgm-on {
    background-color: var(--btn-bgm-on-bg-dark); 
    color: var(--btn-bgm-on-text-dark);
}

/* Responsive Design */
@media (max-width: 480px) { 
    .container {
        padding: 0.8rem;
    }
    #hearts-container {
        font-size: 1.5rem;
        top: 5px;
        /* ★変更: スマホ版でハートの位置を少し右にずらす */
        left: 10px; 
    }
    .character-display-area {
        width: calc(165px + 20px); 
        /* ★変更: スマホ版でキャラクターアイコンとナビゲーションボタンの間隔を広げる */
        gap: 10px; 
    }
    .character-image-container {
        width: 165px;
        height: 165px;
        margin-bottom: 0.3rem; 
    }
    .character {
        max-width: 110px;
    }
    .progress-ring {
        width: 180px;
        height: 180px; 
    }
    .progress-ring-circle {
        r: 80; 
        cx: 90; 
        cy: 90; 
    }
    .character-indicator {
        gap: 6px;
        margin-bottom: 0.3rem; 
    }
    .indicator-dot {
        width: 8px;
        height: 8px;
    }

    .timer-display {
        font-size: 3rem;
    }

    .controls {
        gap: 0.4rem; /* 親コンテナのアイテム間隔を少し詰める */
        padding-top: 0.5rem; /* コントロール全体の上のパディングも少し詰める */
        padding-bottom: 0.5rem; /* コントロール全体の下のパディングも少し詰める */
    }

    .time-controls {
        margin-bottom: 0; /* 時間設定の下マージンをなくす */
        gap: 0.5rem; /* 作業時間と休憩時間設定の間のギャップを少し詰める */
    }
    .time-setting { /* 個々の時間設定（作業・休憩）のレイアウト調整 */
        flex-basis: 100%; 
        max-width: 100%;
        margin-bottom: 0.3rem; /* 各時間設定間のマージンを少し取る */
    }
    .time-setting:last-child {
        margin-bottom: 0; /* 最後の時間設定のマージンは不要 */
    }
    .time-setting select {
        width: 120px; 
    }
    .buttons {
        margin-top: 0; /* ボタン群の上マージンをなくす */
        gap: 0.5rem;
    }
    .btn {
        padding: 0.6rem 1.2rem;
        font-size: 0.85rem;
        width: 90%; 
    }
    .volume-controls { 
        /* display: none !important; */
    }
    .character-nav-btn {
        font-size: 1.3rem; 
        width: 36px;
        height: 36px;
    }
}

/* Animation */
@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}
.pulse {
    animation: pulse 1.5s infinite;
}

.app-footer {
    text-align: center; 
    padding: 1rem 0; 
    margin-top: 1rem; 
    font-size: 0.8em; 
}
.app-footer p {
    color: var(--text-color-light); 
    transition: color 0.3s ease; 
    margin-top: 0.2em; 
    margin-bottom: 0.2em; 
}
body.dark-mode .app-footer p {
    color: var(--text-color-dark); 
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.75); 
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10000; 
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0s linear 0.3s;
}
.modal-overlay.active {
    opacity: 1;
    visibility: visible;
    transition-delay: 0s;
}
.modal-content {
    background-color: var(--container-bg-light); 
    color: var(--text-color-light);             
    padding: 1.5rem; 
    border-radius: 10px;
    text-align: center;
    max-width: 90%;
    width: 320px; 
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
}
body.dark-mode .modal-content { 
    background-color: var(--container-bg-dark);
    color: var(--text-color-dark);
}
.modal-content h2 {
    margin-top: 0;
    margin-bottom: 1rem;
    color: var(--header-text-light); 
    font-size: 1.3rem; 
}
body.dark-mode .modal-content h2 {
    color: var(--header-text-dark);
}
.modal-content p {
    margin-bottom: 1rem; 
    line-height: 1.5;
    font-size: 0.9rem; 
}
.modal-content .btn { 
    background-color: var(--btn-primary-bg-light);
    color: var(--btn-primary-text-light);
    padding: 0.7rem 1.5rem; 
    width: auto; 
    max-width: none;
}
body.dark-mode .modal-content .btn {
    background-color: var(--btn-primary-bg-dark);
    color: var(--btn-primary-text-dark);
}