<template>
    <!-- 悬浮按钮 - 只在最后一页显示 -->
    <div v-if="isLastPage" class="floating-buttons">
        <button 
            v-if="hasNextCourse" 
            class="floating-button next-lesson" 
            @click="handleNextCourse"
        >
            <span class="floating-button-text">下一课</span>
        </button>
        <button 
            class="floating-button back-to-start" 
            @click="handleBackToStart"
        >
            <span class="floating-button-text">回到开始</span>
        </button>
    </div>
</template>

<script>
export default {
    name: 'FloatingButtons',
    props: {
        // 是否为最后一页
        isLastPage: {
            type: Boolean,
            default: false
        },
        // 是否有下一课
        hasNextCourse: {
            type: Boolean,
            default: false
        }
    },
    methods: {
        // 跳转到下一课
        handleNextCourse() {
            this.$emit('next-course');
        },
        // 回到开始
        handleBackToStart() {
            this.$emit('back-to-start');
        }
    }
}
</script>

<style scoped>
/* 悬浮按钮样式 */
.floating-buttons {
    position: fixed;
    top: 50%;
    right: 30rpx;
    transform: translateY(-50%);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 16rpx;
}

.floating-button {
    width: 180rpx;
    height: 88rpx;
    background: linear-gradient(135deg, #06DADC 0%, #04B8BA 100%);
    border-radius: 44rpx;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 6rpx 24rpx rgba(6, 218, 220, 0.25);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: none;
    outline: none;
    position: relative;
    overflow: hidden;
}

.floating-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.2) 0%, rgba(255, 255, 255, 0.05) 100%);
    border-radius: 44rpx;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.floating-button:hover::before {
    opacity: 1;
}

.floating-button:active {
    transform: scale(0.96);
    box-shadow: 0 3rpx 12rpx rgba(6, 218, 220, 0.35);
}

.floating-button-text {
    font-family: PingFang SC, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-weight: 600;
    font-size: 26rpx;
    color: #FFFFFF;
    text-align: center;
    line-height: 1;
    letter-spacing: 0.5rpx;
    position: relative;
    z-index: 1;
}

.floating-button.next-lesson {
    background: linear-gradient(135deg, #06DADC 0%, #04B8BA 100%);
    box-shadow: 0 6rpx 24rpx rgba(6, 218, 220, 0.25);
}

.floating-button.next-lesson:active {
    box-shadow: 0 3rpx 12rpx rgba(6, 218, 220, 0.35);
}

.floating-button.back-to-start {
    background: linear-gradient(135deg, #FF7B7B 0%, #FF6B6B 100%);
    box-shadow: 0 6rpx 24rpx rgba(255, 107, 107, 0.25);
}

.floating-button.back-to-start:active {
    box-shadow: 0 3rpx 12rpx rgba(255, 107, 107, 0.35);
}

/* 响应式调整 */
@media (max-width: 750px) {
    .floating-buttons {
        top: 50%;
        right: 24rpx;
        transform: translateY(-50%);
    }
    
    .floating-button {
        width: 160rpx;
        height: 80rpx;
        border-radius: 40rpx;
    }
    
    .floating-button-text {
        font-size: 24rpx;
    }
}
</style>