:root {
    --primary-color: #FF4081;
    --background-color: #f5f6fa;
    --text-primary: #333333;
    --text-secondary: #666666;
    --success-color: #4CAF50;
    --warning-color: #FF9800;
    --danger-color: #f44336;
    --radius-large: 10px;
    --radius-medium: 5px;
    --shadow: 0 2px 12px rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    margin: 0;
    padding: 20px;
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

h1 {
    font-size: 28px;
    margin-bottom: 10px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 16px;
}

.card {
    background: white;
    border-radius: var(--radius-large);
    padding: 30px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}

.timer-card {
    text-align: center;
}

.time-settings {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-bottom: 30px;
}

.time-input {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.number-input {
    display: flex;
    align-items: center;
    gap: 10px;
}

.number-input input {
    width: 60px;
    text-align: center;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: var(--radius-medium);
    transition: border-color 0.3s ease;
}

.number-input button {
    width: 30px;
    height: 30px;
    border: none;
    background: var(--primary-color);
    color: white;
    border-radius: var(--radius-medium);
    cursor: pointer;
}

.timer-display {
    margin: 30px 0;
}

.timer-circle {
    position: relative;
    width: 220px;
    height: 220px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
}

.progress-ring {
    position: absolute;
    top: 0;
    left: 0;
    transform: rotate(-90deg);
}

.progress-ring-circle {
    transition: stroke-dashoffset 0.3s;
    transform-origin: 50% 50%;
}

.progress-ring-circle.background {
    stroke-dasharray: 615.75;
    stroke-dashoffset: 0;
    stroke: #eee;
}

.progress-ring-circle.foreground {
    stroke: var(--primary-color);
}

.timer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
}

.time {
    font-size: 48px;
    font-weight: bold;
}

.status {
    font-size: 18px;
    color: var(--primary-color);
    font-weight: bold;
}

/* 休息时的颜色 */
.break-mode .progress-ring-circle.foreground {
    stroke: var(--success-color);
}

.break-mode .status {
    color: var(--success-color);
}

.task-input textarea {
    width: 100%;
    padding: 15px;
    border: 1px solid #ddd;
    border-radius: var(--radius-medium);
    margin: 20px 0;
    resize: vertical;
}

.controls {
    display: flex;
    flex-direction: column;
    gap: 15px;
    align-items: center;
}

.button {
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius-medium);
    cursor: pointer;
    font-size: 16px;
    transition: all 0.3s ease;
    display: block;
    margin: 10px auto;
}

.button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.primary {
    background: var(--primary-color);
    color: white;
}

.secondary {
    background: var(--warning-color);
    color: white;
}

.danger {
    background: var(--danger-color);
    color: white;
}

.instructions {
    color: var(--text-secondary);
}

.instructions h2 {
    color: var(--text-primary);
    font-size: 24px;
    margin-bottom: 15px;
}

.instructions ul {
    padding-left: 20px;
    margin-bottom: 20px;
}

.tip {
    font-size: 14px;
    color: var(--text-secondary);
    border-top: 1px solid #eee;
    padding-top: 15px;
}

@media (max-width: 768px) {
    .time-settings {
        flex-direction: column;
        gap: 15px;
    }
    
    .controls {
        flex-direction: column;
    }
    
    .timer-circle {
        width: 180px;
        height: 180px;
    }
    
    .progress-ring {
        width: 180px;
        height: 180px;
    }
    
    .progress-ring-circle.background {
        stroke-dasharray: 490.09;
        stroke-dashoffset: 0;
    }
    
    .time {
        font-size: 36px;
    }
    
    .status {
        font-size: 16px;
    }
}

@media (min-width: 768px) {
    .controls {
        flex-direction: row;
        justify-content: center;
    }
}

/* 添加过渡动画样式 */
.mode-transition {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
}

.mode-transition.show {
    opacity: 1;
    visibility: visible;
}

.transition-content {
    text-align: center;
    color: white;
    transform: scale(0.8);
    transition: transform 0.3s ease;
}

.mode-transition.show .transition-content {
    transform: scale(1);
}

.transition-icon {
    font-size: 64px;
    margin-bottom: 20px;
    animation: bounce 0.5s ease infinite alternate;
}

.transition-message {
    font-size: 24px;
    font-weight: bold;
}

@keyframes bounce {
    from {
        transform: translateY(0);
    }
    to {
        transform: translateY(-10px);
    }
}

/* 优化输入框样式 */
.number-input input:focus {
    border-color: var(--primary-color);
    outline: none;
}

.version {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: normal;
}

.footer {
    text-align: center;
    padding: 20px 0;
    color: var(--text-secondary);
    font-size: 14px;
    border-top: 1px solid #eee;
    margin-top: 40px;
}

.footer a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer a:hover {
    color: var(--text-primary);
}