html { scroll-behavior: smooth; }

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}
.animate-float { animation: float 6s ease-in-out infinite; }

body { padding-top: 58px; }

.mobile-nav { display: none; }
.mobile-nav.is-open { display: block; }

/* 首页 / 下载页 FAQ 折叠 */
.page-faq-answer { display: none; }
.page-faq-item.is-open .page-faq-answer { display: block; }
.page-faq-item.is-open .page-faq-icon { transform: rotate(180deg); }
.page-faq-icon { transition: transform 0.2s; }
.page-faq-list { display: flex; flex-direction: column; gap: 1rem; }
.page-faq-actions { margin-top: 3rem; padding-top: 1rem; }
.page-faq-toggle { gap: 1rem; }

/* 用户评价区 */
.review-bar-fill { transition: width 0.6s ease; }
.reviews-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}
@media (min-width: 1024px) {
    .reviews-layout {
        grid-template-columns: 340px 1fr;
        gap: 3rem;
        align-items: start;
    }
}
.reviews-cards {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}
@media (min-width: 768px) {
    .reviews-cards { grid-template-columns: repeat(2, 1fr); }
}
.reviews-star-row { display: flex; align-items: center; gap: 0.75rem; }
.reviews-star-row .bar-label { width: 2rem; flex-shrink: 0; color: #9ca3af; font-size: 0.875rem; }
.reviews-star-row .bar-pct { width: 2.5rem; flex-shrink: 0; text-align: right; color: #9ca3af; font-size: 0.875rem; }
.reviews-star-row .bar-track { flex: 1; min-width: 0; height: 0.5rem; background: rgba(255,255,255,0.1); border-radius: 9999px; overflow: hidden; }
.reviews-summary-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }

/* FAQ 专页 */
.faq-answer { display: none; }
.faq-item.is-open .faq-answer { display: block; }
.faq-item.is-open .faq-icon { transform: rotate(180deg); }
.faq-icon { transition: transform 0.2s; }
.faq-item.is-hidden { display: none !important; }

/* 页脚 */
.site-footer-inner {
    padding-top: 2rem;
    padding-bottom: 2rem;
}
.site-footer-nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    column-gap: 2.5rem;
    row-gap: 1rem;
    margin-bottom: 1.75rem;
    font-size: 0.875rem;
}
.site-footer-nav a {
    padding: 0.375rem 1rem;
}
.site-footer-copy {
    text-align: center;
    font-size: 0.75rem;
    color: #6b7280;
    padding-top: 1.25rem;
    border-top: 1px solid #e5e7eb;
}

/* 404 页面 */
.error-page {
    min-height: calc(100vh - 58px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 4rem 1rem;
    background: linear-gradient(to bottom right, #111827, #1f2937, #000);
}
.error-page-inner {
    text-align: center;
    max-width: 40rem;
    width: 100%;
}
.error-page-code {
    font-size: clamp(5rem, 18vw, 9rem);
    font-weight: 700;
    line-height: 1;
    color: #fbbf24;
    margin-bottom: 1rem;
}
.error-page-title {
    font-size: clamp(1.5rem, 4vw, 2rem);
    font-weight: 700;
    color: #fff;
    margin-bottom: 1rem;
}
.error-page-desc {
    font-size: 1.125rem;
    color: #9ca3af;
    line-height: 1.75;
    margin-bottom: 2rem;
}
.error-page-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2.5rem;
}
.error-page-btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    background: #fbbf24;
    color: #000;
    font-weight: 700;
    border-radius: 0.75rem;
    text-decoration: none;
    transition: transform 0.2s, background 0.2s;
}
.error-page-btn-primary:hover {
    background: rgba(251, 191, 36, 0.9);
    transform: scale(1.03);
}
.error-page-btn-outline {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    border: 2px solid #fbbf24;
    color: #fbbf24;
    font-weight: 700;
    border-radius: 0.75rem;
    text-decoration: none;
    transition: background 0.2s, color 0.2s;
}
.error-page-btn-outline:hover {
    background: #fbbf24;
    color: #000;
}
.error-page-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    max-width: 28rem;
    margin: 0 auto;
}
@media (max-width: 480px) {
    .error-page-links { grid-template-columns: 1fr; max-width: 14rem; }
}
.error-page-links a {
    padding: 0.75rem 1rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 0.75rem;
    color: #d1d5db;
    font-size: 0.875rem;
    text-decoration: none;
    transition: border-color 0.2s, color 0.2s;
}
.error-page-links a:hover {
    border-color: rgba(251, 191, 36, 0.5);
    color: #fbbf24;
}