@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.how-to-use {
    padding: 8rem 2rem;
    background: linear-gradient(180deg, var(--bg-dark) 0%, var(--bg-darker) 100%);
    overflow: visible;
}

.how-to-use-container {
    max-width: 1400px;
    margin: 0 auto;
}

.how-to-use-header {
    text-align: center;
    margin-bottom: 6rem;
}

.how-to-use-title {
    font-size: 3.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--text-light) 30%, var(--pink-primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
/* Arabic typography */
html[dir="rtl"] .how-to-use-title,
html[dir="rtl"] .how-to-use-subtitle,
html[dir="rtl"] .how-to-use-step-title,
html[dir="rtl"] .how-to-use-step-description { letter-spacing: 0; }
html[dir="rtl"] .how-to-use-step-description { line-height: 1.7; }

.how-to-use-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

.how-to-use-steps {
    display: flex;
    flex-direction: column;
    gap: 8rem;
}

.how-to-use-step {
    display: flex;
    align-items: center;
    gap: 4rem;
}

.how-to-use-step:nth-child(even) {
    flex-direction: row-reverse;
}

.how-to-use-step-content {
    flex: 0.8;
    padding: 2rem;
}

.how-to-use-step-number {
    width: 48px;
    height: 48px;
    background: var(--surface-overlay);
    backdrop-filter: blur(10px);
    border: 1px solid var(--color-border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--pink-primary);
    transition: all 0.3s ease;
}

.how-to-use-step:hover .how-to-use-step-number {
    transform: translateY(-5px);
    background: var(--surface-overlay-strong);
    border-color: var(--pink-primary);
    box-shadow: var(--shadow-md);
}

.how-to-use-step-title {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--text-light);
    line-height: 1.2;
}

.how-to-use-step-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.6;
    max-width: 480px;
}

.how-to-use-step-image {
    flex: 1.2;
    position: relative;
}

.how-to-use-img {
    width: 100%;
    height: auto;
    border-radius: 1rem;
    box-shadow: var(--shadow-lg);
    background: var(--surface-subtle);
    backdrop-filter: blur(10px);
    transition: transform 0.3s ease, opacity 0.3s ease;
    opacity: 0.95;
}

.how-to-use-img:hover {
    transform: translateY(-5px);
    opacity: 1;
}

/* 添加图片加载时的占位样式 */
.how-to-use-img:not([src]) {
    min-height: 300px;
    background: var(--surface-subtle);
}

/* 修改装饰性背景，防止溢出 */
.how-to-use-step-image::before {
    content: '';
    position: absolute;
    top: -10%;
    right: -10%;
    width: 100%; /* 减小宽度 */
    height: 120%;
    background: radial-gradient(circle at center, var(--surface-subtle), transparent 70%);
    pointer-events: none;
    z-index: -1;
}

/* RTL: swap decorative halo side to match flow */
html[dir="rtl"] .how-to-use-step-image::before { right: auto; left: -10%; }

/* 添加连接线效果 */
.how-to-use-steps::before {
    content: '';
    position: absolute;
    top: 24px;
    left: 25%;
    right: 25%;
    height: 1px;
    background: linear-gradient(
        to right,
        transparent,
        var(--pink-primary) 20%,
        var(--pink-primary) 80%,
        transparent
    );
    opacity: 0.3;
    z-index: -1;
}

@media (max-width: 1200px) {
    .how-to-use {
        padding: 6rem 2rem;
    }

    .how-to-use-step {
        gap: 3rem;
    }
}

@media (max-width: 992px) {
    .how-to-use-title {
        font-size: 2.5rem;
    }

    .how-to-use-steps {
        gap: 6rem;
    }

    .how-to-use-step,
    .how-to-use-step:nth-child(even) {
        flex-direction: column;
        gap: 2rem;
        text-align: center;
    }

    .how-to-use-step-content {
        padding: 0;
    }

    .how-to-use-step-description {
        margin: 0 auto;
    }

    .how-to-use-steps::before {
        display: none;
    }

    .how-to-use-step-number {
        margin: 0 auto 1.5rem;
    }
}

@media (max-width: 734px) {
    .how-to-use-title {
        font-size: 2rem;
    }
    .how-to-use-subtitle{
        font-size: 1rem;
    }
    .how-to-use-step-title{
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .how-to-use {
        padding: 4rem 1.5rem;
    }

    .how-to-use-header {
        margin-bottom: 4rem;
    }

    .how-to-use-steps {
        gap: 4rem;
    }
}