* {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            -webkit-tap-highlight-color: transparent;
            -webkit-user-select: none;
            user-select: none;
            touch-action: manipulation;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-color: #000000;
            color: #E0E0E0;
            display: flex;
            flex-direction: column;
            height: 100vh;
            overflow: hidden;
        }

        input[type="text"], input[type="number"] {
            -webkit-user-select: text;
            user-select: text;
        }

        header {
            background-color: #121212;
            border-bottom: 1px solid #222;
            display: flex;
            justify-content: space-around;
            padding: 8px;
            flex-shrink: 0;
        }

        .tab-btn {
            flex: 1;
            padding: 12px;
            background: none;
            border: none;
            color: #888;
            font-size: 16px;
            font-weight: bold;
            cursor: pointer;
            border-bottom: 3px solid transparent;
            transition: all 0.2s;
        }

        .tab-btn.active {
            color: #FF9800;
            border-bottom-color: #FF9800;
        }

        main {
            flex: 1;
            overflow-y: auto;
            position: relative;
        }

        .tab-content {
            display: none;
            height: 100%;
            flex-direction: column;
            padding: 15px;
        }

        .tab-content.active {
            display: flex;
        }

        .multi-timer-container {
            display: flex;
            flex-direction: column;
            gap: 15px;
            max-width: 450px;
            margin: 0 auto;
            width: 100%;
        }

        .accordion-card {
            background-color: #121212;
            border-radius: 16px;
            border: 1px solid #222;
            overflow: hidden;
            transition: all 0.3s ease;
        }

        .accordion-header {
            width: 100%;
            padding: 16px;
            background-color: #1A1A1A;
            color: #FF9800;
            font-size: 16px;
            font-weight: bold;
            border: none;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
        }

        .accordion-icon {
            font-size: 14px;
            transition: transform 0.3s ease;
        }

        .accordion-card.open .accordion-icon {
            transform: rotate(180deg);
        }

        .accordion-body {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease-out, padding 0.35s ease-out;
            padding: 0 15px;
            display: flex;
            flex-direction: column;
            gap: 15px;
        }

        .accordion-card.open .accordion-body {
            max-height: 380px;
            padding: 15px;
        }

        .label-input {
            width: 100%;
            padding: 10px;
            background-color: #1E1E1E;
            border: 1px solid #333;
            border-radius: 8px;
            color: #FFF;
            font-size: 14px;
        }

        .label-input:focus {
            outline: none;
            border-color: #FF9800;
        }

        .wheel-picker-wrapper {
            position: relative;
            width: 100%;
            height: 160px;
            display: flex;
            justify-content: center;
            align-items: center;
            background-color: #000000;
            border-radius: 12px;
            overflow: hidden;
        }

        .wheel-selection-bar {
            position: absolute;
            top: 50%;
            left: 8px;
            right: 8px;
            height: 40px;
            transform: translateY(-50%);
            background-color: rgba(255, 255, 255, 0.15);
            border-radius: 8px;
            pointer-events: none;
            z-index: 2;
        }

        .wheel-column-group {
            display: flex;
            width: 100%;
            height: 100%;
            justify-content: space-evenly;
            align-items: center;
            z-index: 1;
        }

        .wheel-column {
            display: flex;
            align-items: center;
            position: relative;
        }

        .wheel-container {
            width: 55px;
            height: 160px;
            overflow: hidden;
            position: relative;
            cursor: grab;
            touch-action: none;
        }

        .wheel-list {
            position: absolute;
            width: 100%;
            top: 60px;
            left: 0;
            list-style: none;
        }

        .wheel-item {
            height: 40px;
            line-height: 40px;
            text-align: center;
            font-size: 22px;
            font-weight: 300;
            color: #666;
            cursor: pointer;
        }

        .wheel-item.selected {
            color: #FFF;
            font-weight: bold;
            font-size: 25px;
        }

        .wheel-unit {
            font-size: 13px;
            color: #FFF;
            font-weight: bold;
            margin-left: 2px;
            pointer-events: none;
        }

        .add-btn {
            width: 100%;
            padding: 12px;
            background-color: #FF9800;
            color: #000;
            border: none;
            border-radius: 10px;
            font-weight: bold;
            font-size: 16px;
            cursor: pointer;
        }

        .add-btn:active {
            opacity: 0.8;
        }

        .timers-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .timer-card {
            background-color: #121212;
            border-radius: 16px;
            padding: 15px;
            border: 1px solid #222;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .timer-card-left {
            display: flex;
            align-items: center;
            gap: 15px;
        }

        .progress-circle-wrapper {
            position: relative;
            width: 65px;
            height: 65px;
        }

        .progress-svg {
            transform: rotate(-90deg);
            width: 100%;
            height: 100%;
        }

        .circle-bg {
            fill: none;
            stroke: #222;
            stroke-width: 6;
        }

        .circle-bar {
            fill: none;
            stroke: #FF9800;
            stroke-width: 6;
            stroke-linecap: round;
            stroke-dasharray: 188;
            stroke-dashoffset: 0;
            transition: stroke-dashoffset 0.2s linear;
        }

        .timer-info {
            display: flex;
            flex-direction: column;
            gap: 4px;
        }

        .timer-name {
            font-size: 14px;
            font-weight: bold;
            color: #AAA;
        }

        .timer-time-text {
            font-size: 26px;
            font-weight: 300;
            font-variant-numeric: tabular-nums;
            color: #FFF;
        }

        .timer-controls {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .sm-circle-btn {
            width: 42px;
            height: 42px;
            border-radius: 50%;
            border: none;
            font-size: 12px;
            font-weight: bold;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #FFF;
        }

        .btn-start { background-color: #2E7D32; color: #81C784; }
        .btn-pause { background-color: #E65100; color: #FFB74D; }
        .btn-reset { background-color: #222; color: #AAA; }
        .btn-delete { background-color: transparent; color: #E57373; font-size: 16px; border: 1px solid #333; width: 30px; height: 30px; }

        .presen-container {
            display: flex;
            flex-direction: column;
            gap: 15px;
            max-width: 450px;
            margin: 0 auto;
            width: 100%;
        }

        .presen-timer-card {
            background-color: #121212;
            border-radius: 16px;
            padding: 20px;
            text-align: center;
            border: 1px solid #222;
        }

        .presen-time-display {
            font-size: 64px;
            font-weight: bold;
            color: #FFF;
            font-variant-numeric: tabular-nums;
            margin: 10px 0;
        }

        .bell-settings-card {
            background-color: #121212;
            border-radius: 16px;
            padding: 15px;
            border: 1px solid #222;
        }

        .card-title {
            font-size: 14px;
            color: #888;
            margin-bottom: 12px;
            border-bottom: 1px solid #222;
            padding-bottom: 6px;
        }

        .bell-row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 12px;
        }

        .bell-row-left {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .bell-tag {
            background-color: #222;
            color: #FFB74D;
            padding: 4px 8px;
            border-radius: 6px;
            font-size: 12px;
            font-weight: bold;
            min-width: 75px;
            text-align: center;
        }

        .bell-time-inputs {
            display: flex;
            align-items: center;
            gap: 4px;
        }

        .mini-input {
            width: 45px;
            padding: 6px;
            background-color: #1E1E1E;
            border: 1px solid #333;
            border-radius: 6px;
            color: #FFF;
            text-align: center;
            font-size: 14px;
        }

        .switch {
            position: relative;
            display: inline-block;
            width: 44px;
            height: 24px;
        }

        .switch input { opacity: 0; width: 0; height: 0; }

        .slider {
            position: absolute;
            cursor: pointer;
            top: 0; left: 0; right: 0; bottom: 0;
            background-color: #333;
            transition: .2s;
            border-radius: 24px;
        }

        .slider:before {
            position: absolute;
            content: "";
            height: 18px;
            width: 18px;
            left: 3px;
            bottom: 3px;
            background-color: white;
            transition: .2s;
            border-radius: 50%;
        }

        input:checked + .slider { background-color: #4CAF50; }
        input:checked + .slider:before { transform: translateX(20px); }

        .manual-bell-btn {
            width: 100%;
            padding: 16px;
            background-color: #D84315;
            color: #FFF;
            border: none;
            border-radius: 12px;
            font-size: 17px;
            font-weight: bold;
            cursor: pointer;
            box-shadow: 0 4px 12px rgba(216, 67, 21, 0.3);
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
        }

        .manual-bell-btn:active {
            transform: scale(0.98);
            opacity: 0.9;
        }

        .empty-msg {
            text-align: center;
            color: #555;
            padding: 30px 0;
            font-size: 14px;
        }

        /* MRS TOOLS リンク（追加分のみ） */
        .footer-link-container {
            width: 100%;
            margin-top: 24px;
            margin-bottom: 12px;
            text-align: center;
        }

        .btn-footer-link {
            display: inline-block;
            color: #888888;
            font-size: 0.85rem;
            font-weight: normal;
            text-decoration: underline;
            background: none;
            border: none;
            border-radius: 0;
            min-height: auto;
            padding: 4px 8px;
            transition: color 0.2s;
        }

        .btn-footer-link:active,
        .btn-footer-link:hover {
            color: #cccccc;
            background-color: transparent;
            transform: none;
        }


/* Added for advertisement and bell-count alignment; existing visual design is unchanged. */
.ad-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #121212;
    z-index: 1000;
    padding-top: 1px;
    padding-bottom: calc(1px + env(safe-area-inset-bottom));
    border-top: 1px solid #333;
}

.bell-count {
    width: 28px;
    flex-shrink: 0;
    text-align: center;
    font-size: 12px;
    color: #4CAF50;
}


/* Align the 1回 label with the 2回/3回 labels by reserving the switch space. */
.switch-placeholder {
    display: inline-block;
    width: 44px;
    height: 24px;
    flex-shrink: 0;
    visibility: hidden;
}