body {
    font-family: 'Segoe UI', Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    transition: background-color 0.3s ease;
}

/* 工作主题（番茄色） */
body.work-theme {
    background: #fdf2e9;
}

/* 休息主题（绿色） */
body.break-theme {
    background: #e8f5e8;
}

.container {
    background: #fff;
    padding: 32px 40px;
    border-radius: 16px;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
    text-align: center;
}

h1 {
    margin-bottom: 24px;
    color: #d35400;
    transition: color 0.3s ease;
}

/* 休息主题下的标题颜色 */
body.break-theme h1 {
    color: #27ae60;
}

#timer {
    font-size: 64px;
    margin-bottom: 24px;
    color: #333;
    letter-spacing: 2px;
}

.controls button {
    font-size: 18px;
    margin: 0 8px;
    padding: 8px 24px;
    border: none;
    border-radius: 6px;
    background: #d35400;
    color: #fff;
    cursor: pointer;
    transition: background 0.3s ease;
}

.controls button:hover {
    background: #e67e22;
}

/* 休息主题下的按钮样式 */
body.break-theme .controls button {
    background: #27ae60;
}

body.break-theme .controls button:hover {
    background: #2ecc71;
}

.status {
    margin-top: 20px;
    font-size: 20px;
    color: #888;
    transition: color 0.3s ease;
}

/* 休息主题下的状态文字颜色 */
body.break-theme .status {
    color: #27ae60;
}