/* 🌿 ナチュラルテイストのベースデザイン */
body {
    background-color: #f2f7f4;
    color: #2c3e35;
    font-family: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100dvh;
    height: 100dvh;
    margin: 0;
    transition: all 0.5s ease;
    position: relative;
}

/* 🌊 休憩モード用の背景色（優しいアイスブルー） */
body.rest-mode {
    background-color: #e9f0fa;
    color: #2a3a4a;
}

/* 📦 タイマーとスイッチをまとめる中央グループ */
.timer-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 60px;
    gap: 50px;
}

/* 🎛️ ラジオスタジオ風スイッチ */
.studio-switch {
    display: flex;
    background-color: #e2ede7;
    border-radius: 6px;
    padding: 4px;
    gap: 4px;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.05);
    transition: background-color 0.5s ease;
}
body.rest-mode .studio-switch {
    background-color: #dadfe8;
}

/* スイッチのランプ単体 */
.lamp {
    font-size: 10px;
    font-weight: bold;
    letter-spacing: 1.5px;
    padding: 4px 14px;
    border-radius: 4px;
    color: #a3b8ad;
    transition: all 0.3s ease;
}
body.rest-mode .lamp {
    color: #b5c2cc;
}

/* 🟢 集中ワーク中の点灯状態 */
body:not(.rest-mode) .lamp.focus-lamp {
    background-color: #4a6b5d;
    color: #ffffff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.12);
}

/* 🔵 マインドフル休憩中の点灯状態 */
body.rest-mode .lamp.rest-lamp {
    background-color: #2b6cb0;
    color: #ffffff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.15);
}

/* ⏱️ タイマー表示部分 */
#display {
    font-size: 90px;
    font-weight: 300;
    margin: 15px 0 0 0;
    font-variant-numeric: tabular-nums;
    transition: color 0.5s ease;
}

body.rest-mode #display {
    color: #2b6cb0;
}

/* 📦 ボタンのコンテナ */
.button-group, .control-group {
    display: flex;
    justify-content: center;
    gap: 10px;
}

.button-group {
    margin-bottom: 60px;
}

/* 🖱️ ボタンの共通デザイン */
button {
    background-color: #ffffff;
    color: #4a6b5d;
    border: 1px solid #d3e2db;
    border-radius: 20px;
    padding: 8px 16px;
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.5px;
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0,0,0,0.02);
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

body.rest-mode button {
    color: #3a536b;
    border-color: #d1dfed;
}

button:hover {
    background-color: #eaf2ee;
    border-color: #b8cfc4;
}
body.rest-mode button:hover {
    background-color: #e3edf7;
    border-color: #b3c7dc;
}

button svg {
    width: 12px;
    height: 12px;
    fill: currentColor;
}

.control-group button {
    padding: 10px 0;
    font-size: 13px;
    font-weight: bold;
    border-radius: 25px;
    letter-spacing: 1px;
    min-width: 102px;
}

.btn-toggle {
    background-color: #4a6b5d;
    color: #ffffff;
    border: none;
}
.btn-toggle:hover {
    background-color: #385246;
}

.btn-toggle.running {
    background-color: #4a6b5d;
}
.btn-toggle.running:hover {
    background-color: #385246;
}

body.rest-mode .btn-toggle {
    background-color: #2b6cb0;
    color: #ffffff;
}
body.rest-mode .btn-toggle:hover {
    background-color: #1e4e80;
}

body.rest-mode .btn-toggle.running {
    background-color: #2b6cb0;
    color: #ffffff;
}
body.rest-mode .btn-toggle.running:hover {
    background-color: #1e4e80;
}

.brand-footer {
    position: absolute;
    bottom: 25px;
    font-size: 11px;
    letter-spacing: 2px;
    opacity: 0.3;
    text-transform: uppercase;
}