img { max-width: 100%; height: auto; display: block; }
.container { max-width: 1320px; margin: 0 auto; padding: 0 22px; }
.page-main { font-family: "Microsoft YaHei", Arial, sans-serif; }
ul { list-style: none; margin: 0; padding: 0; }
:root {
    --primary-green: #00a040;
    --text-gray: #666;
}

.hero-banner {
    width: 100%;
    position: relative;
    background-color: #f0f0f0;
    aspect-ratio: 4 / 1;
    overflow: hidden;
}
.hero-banner img { width: 100%; height: 100%; object-fit: cover; }

.tabs-section { padding: 50px 0; }
.tabs {
    display: flex;
    justify-content: center;
    border-bottom: 1px solid #eee;
    margin-bottom: 60px;
    flex-wrap: wrap;
}
.tabs li {
    padding: 15px 60px;
    font-size: 20px;
    color: #666;
    cursor: default;
    position: relative;
}
.tabs li.active { color: var(--primary-green); }
.tabs li.active::after {
    content: "";
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--primary-green);
}
.intro-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
}
.intro-text { flex: 1; }
.intro-text h2 {
    font-size: 54px;
    color: #2b2f33;
    line-height: 1.08;
    margin-bottom: 12px;
    letter-spacing: 1px;
    font-weight: 600;
    font-family: "Microsoft YaHei", Arial, sans-serif;
}
.intro-text h3 {
    font-size: 20px;
    color: rgba(44, 49, 53, 0.62);
    font-weight: normal;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-family: Arial, sans-serif;
}
.intro-map { flex: 1.2; }

.stats-section {
    background-color: var(--primary-green);
    color: #fff;
    padding: 45px 0;
}
.stats-grid { display: flex; justify-content: space-between; gap: 40px; }
.stat-item { flex: 1; }
.stat-number { font-size: 76px; font-weight: 700; line-height: 1; letter-spacing: 1px; }
.stat-title { font-size: 20px; margin-top: 24px; font-weight: normal; color: rgba(255, 255, 255, 0.92); }

.stats-desc-section { background: #fff; padding: 40px 0 60px; }
.stats-desc-grid { display: flex; justify-content: space-between; gap: 40px; }
.stat-desc-item {
    flex: 1;
    font-size: 17px;
    color: rgba(38, 42, 46, 0.86);
    line-height: 2.05;
    text-align: justify;
    font-family: "Microsoft YaHei", Arial, sans-serif;
}

/* 资质证书板块：与首页 index #s3 一致（背景 / 排版 / 图片组合 / 飞入动效） */
.cert-section-about {
    position: relative;
    padding: 100px 0 110px;
    background: #f1f3f5;
    color: #0f172a;
    overflow: hidden;
}
.cert-section-about::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        linear-gradient(135deg, rgba(255, 255, 255, 0.72) 0 36%, rgba(235, 238, 242, 0.62) 36% 64%, rgba(255, 255, 255, 0.72) 64% 100%);
    pointer-events: none;
}
.cert-section-about > .container {
    position: relative;
    max-width: 1320px;
    z-index: 2;
}
.cert-section-about .cert-layout {
    display: grid;
    grid-template-columns: 430px 1fr;
    align-items: center;
    gap: 26px;
}
.cert-section-about .cert-content {
    padding-left: 18px;
}
.cert-section-about .cert-title {
    font-size: 54px;
    margin: 0;
    line-height: 1;
    color: #2b2f33;
    font-family: "Microsoft YaHei", Arial, sans-serif;
}
.cert-section-about .cert-line {
    width: 52px;
    height: 4px;
    border-radius: 2px;
    background: #00d971;
    margin: 24px 0 28px;
}
.cert-section-about .cert-desc {
    margin: 0;
    max-width: 360px;
    font-size: 17px;
    line-height: 2.05;
    color: rgba(38, 42, 46, 0.86);
    font-family: "Microsoft YaHei", Arial, sans-serif;
}
.cert-section-about .cert-board-shell {
    width: 100%;
    display: flex;
    justify-content: flex-end;
}
.cert-section-about .cert-board {
    position: relative;
    width: 950px;
    height: 560px;
    max-width: 100%;
    margin-left: auto;
}
.cert-section-about .cert-img {
    position: absolute;
    max-width: none;
    height: auto;
    opacity: 0;
    transform: translate3d(var(--from-x), var(--from-y), 0) rotate(var(--from-r)) scale(0.84);
    transition: transform 1.08s cubic-bezier(0.2, 0.8, 0.2, 1), opacity 0.85s ease;
    will-change: transform, opacity;
    object-fit: cover;
    filter: drop-shadow(0 8px 20px rgba(0, 0, 0, 0.16));
    backface-visibility: hidden;
}
.cert-section-about.is-visible .cert-img {
    opacity: 1;
    transform: translate3d(0, 0, 0) rotate(0deg) scale(1);
}
.cert-section-about .cert-img.t1 {
    left: 18px;
    top: 30px;
    width: 240px;
    height: 290px;
    --from-x: -520px;
    --from-y: -240px;
    --from-r: -18deg;
    transition-delay: 0.08s;
}
.cert-section-about .cert-img.t2 {
    left: 285px;
    top: 26px;
    width: 240px;
    height: 295px;
    --from-x: 0;
    --from-y: -320px;
    --from-r: 10deg;
    transition-delay: 0.18s;
}
.cert-section-about .cert-img.t3 {
    left: 552px;
    top: 30px;
    width: 240px;
    height: 290px;
    --from-x: 520px;
    --from-y: -220px;
    --from-r: 16deg;
    transition-delay: 0.28s;
}
.cert-section-about .cert-img.b4 {
    left: 18px;
    top: 336px;
    width: 240px;
    height: 176px;
    --from-x: -460px;
    --from-y: 260px;
    --from-r: -16deg;
    transition-delay: 0.22s;
}
.cert-section-about .cert-img.b5 {
    left: 285px;
    top: 336px;
    width: 240px;
    height: 176px;
    --from-x: 0;
    --from-y: 320px;
    --from-r: 8deg;
    transition-delay: 0.32s;
}
.cert-section-about .cert-img.b6 {
    left: 552px;
    top: 336px;
    width: 240px;
    height: 176px;
    --from-x: 500px;
    --from-y: 280px;
    --from-r: 16deg;
    transition-delay: 0.42s;
}
.cert-section-about .cert-img.cover {
    left: 205px;
    top: 164px;
    width: 398px;
    height: 234px;
    z-index: 2;
    --from-x: 0;
    --from-y: -300px;
    --from-r: 0deg;
    transition-delay: 0.5s;
    transition-duration: 1.2s, 0.8s;
    transition-timing-function: cubic-bezier(0.16, 0.84, 0.24, 1), ease;
}

@media (max-width: 1200px) {
    .cert-section-about .cert-layout {
        grid-template-columns: 1fr;
        gap: 48px;
    }
    .cert-section-about .cert-desc {
        max-width: none;
    }
    .cert-section-about .cert-board-shell {
        justify-content: center;
        overflow-x: auto;
        overflow-y: hidden;
        padding-bottom: 8px;
        -webkit-overflow-scrolling: touch;
    }
    .cert-section-about .cert-board {
        flex-shrink: 0;
        margin-right: auto;
        margin-left: auto;
    }
}
@media (max-width: 992px) {
    .cert-section-about .cert-title {
        font-size: 42px;
    }
}

.features-section { padding: 100px 0 60px; }
.feature-row {
    display: flex;
    align-items: center;
    margin-bottom: 80px;
    gap: 60px;
}
.feature-row.reverse { flex-direction: row-reverse; }
.feature-text { flex: 1; }
.feature-text h3 { font-size: 30px; color: var(--primary-green); margin-bottom: 12px; font-weight: 500; line-height: 1.25; font-family: "Microsoft YaHei", Arial, sans-serif; }
.feature-text p { font-size: 17px; color: rgba(38, 42, 46, 0.86); line-height: 2.05; font-family: "Microsoft YaHei", Arial, sans-serif; }
.feature-image { flex: 1; }

@media (max-width: 992px) {
    .tabs li { padding: 15px 30px; font-size: 18px; }
    .intro-text h2 { font-size: 40px; }
    .intro-text h3 { font-size: 16px; }
    .stat-number { font-size: 56px; }
    .stat-title { font-size: 17px; margin-top: 18px; }
}
@media (max-width: 768px) {
    .tabs li { padding: 10px 20px; width: 33.33%; text-align: center; font-size: 16px; }
    .stat-number { font-size: 48px; }
    .intro-content, .feature-row, .feature-row.reverse { flex-direction: column; }
    .stats-grid { flex-direction: column; text-align: center; }
    .stats-desc-grid { flex-direction: column; gap: 20px; }
    .intro-map, .feature-image { width: 100%; margin-top: 30px; }
    .feature-row { margin-bottom: 50px; gap: 30px; }
}