/* 外层只做间距，不加任何卡片样式 */
.tool-container {
    max-width: 750px;
    margin: 60px auto;
    padding: 0 24px;
}

/* 内部包裹层：负责居中、排版、内边距，无卡片效果 */
.stopwatch-inner {
    width: 100%;
    text-align: center;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
}

/* 时间显示区域 */
.time-display-area {
    margin: 40px 0 60px;
}
.main-time {
    font-size: 80px;
    font-weight: 500;
    color: #111;
    letter-spacing: 6px;
    font-variant-numeric: tabular-nums;
    line-height: 1;
    margin-bottom: 12px;
}
.sub-time {
    font-size: 18px;
    color: #888;
    letter-spacing: 1px;
}

/* 按钮组 */
.control-group {
    display: flex;
    justify-content: center;
    gap: 18px;
    margin-bottom: 50px;
    flex-wrap: wrap;
}
.control-btn {
    width: 126px;
    height: 54px;
    border-radius: 999px;
    font-size: 16px;
    font-weight: 500;
    border: none;
    cursor: pointer;
    transition: all 0.25s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}
.control-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}
.control-btn:active {
    transform: translateY(0);
}
.control-btn:disabled {
    opacity: 0.35;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

/* 按钮配色 */
.btn-start {
    background: #22c55e;
    color: #fff;
}
.btn-pause {
    background: #f59e0b;
    color: #fff;
}
.btn-record {
    background: #3b82f6;
    color: #fff;
}
.btn-reset {
    background: #ef4444;
    color: #fff;
}

/* 计次记录区域 */
.record-container {
    max-height: 300px;
    overflow-y: auto;
    text-align: left;
    padding-top: 20px;
    border-top: 1px solid #eee;
}
.record-container::-webkit-scrollbar {
    width: 5px;
}
.record-container::-webkit-scrollbar-thumb {
    background: #ddd;
    border-radius: 5px;
}
.record-title {
    font-size: 16px;
    font-weight: 500;
    color: #333;
    margin-bottom: 16px;
    padding: 0 10px;
}
.record-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 18px;
    border-radius: 16px;
    margin-bottom: 10px;
    background: #f9fafb;
    font-size: 16px;
    color: #444;
    transition: background 0.2s ease;
}
.record-item:hover {
    background: #f3f4f6;
}
.record-item .index {
    font-weight: 500;
    color: #222;
}
.record-item .time {
    font-weight: 500;
    font-variant-numeric: tabular-nums;
    letter-spacing: 1px;
}

/* 移动端适配 */
@media (max-width: 640px) {
    .main-time {
        font-size: 50px;
        letter-spacing: 3px;
    }
    .control-group {
        gap: 12px;
    }
    .control-btn {
        width: 100px;
        height: 46px;
        font-size: 15px;
    }
}