/* ============================================================
   about-us.css - About 页面
   结构: 1. 基础样式  2. 响应式(按断点合并)
   ============================================================ */

/* ========== 1. 基础样式 ========== */
.about-us__banner {
    width: 100%;
}

.about-us__banner img {
    display: block;
    width: 100%;
    height: auto;
}

.about-us {
    padding: 80px 0;
    background: #EEEEEE;
}

.about-us__title {
    font-weight: 900;
    font-style: Black;
    font-size: var(--font-size-banner);
    letter-spacing: 0;
    margin-bottom: 170px;
}

.about-us__content {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: end;
    max-width: var(--container-width);
}

.about-us__icon {
    max-width: 140px;
}

.about-us__icon img {
    display: block;
    width: 100%;
    height: auto;
}

.about-us__desc {
    font-size: var(--font-size-4xl);
    font-weight: 900;
}

.about-us__desc p {
    line-height: 1;
}

.about-us__desc-highlight {
    color: var(--color-primary);
}

.about-us__section {
    display: flex;
    flex-direction: row;
}

.about-us__section--one {
    width: 100%;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 840px 1fr;
    align-items: stretch;
}

.about-us__section--two {
    width: 100%;
    max-width: 1920px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 840px;
    align-items: stretch;
}

.about-us__section--two .about-us__section-content {
    display: flex;
    align-items: center;
    height: 100%;
    line-height: 1.25;
    background: #EEEEEE;
}

.about-us__section-img {
    width: 100%;
    overflow: hidden;
}

.about-us__section-img img {
    width: 100%;
    height: auto;
    display: block;
}

.about-us__section--one .about-us__section-img img {
    width: 100%;
    height: auto;
    display: block;
}

.about-us__section-content {
    display: flex;
    align-items: center;
}

.about-us__section-desc {
    font-size: var(--font-size-4xl);
    font-weight: 600;
    padding: 80px;
}

.about-us__section--three {
    padding: 80px 0;
}

.about-us__section--three .about-us__section-img {
    max-width: 840px;
}

.about-us__cta {
    width: 100%;
    margin: 0 auto;
    text-align: center;
    padding: 150px 0;
    display: flex;
    justify-content: center;
    align-items: center;
    max-width: 280px;
}

.about-us__cta img {
    display: block;
    width: 100%;
    height: auto;
}

/* ========== 2. 响应式 (按断点合并) ========== */

/* --- 2.1 笔记本 1024–1919px --- */
@media (min-width: 1024px) and (max-width: 1919px) {
    .about-us {
        padding: 60px 0;
    }

    .about-us__title {
        font-size: var(--font-size-hero-sm);
        margin-bottom: 120px;
    }

    .about-us__icon {
        max-width: 120px;
    }

    .about-us__desc {
        font-size: var(--font-size-3xl);
    }

    .about-us__section--one {
        grid-template-columns: 680px 1fr;
    }

    .about-us__section--two {
        grid-template-columns: 1fr 680px;
    }

    .about-us__section-desc {
        font-size: var(--font-size-2xl);
        padding: 60px;
    }

    .about-us__section--three {
        padding: 60px 0;
    }

    .about-us__section--three .about-us__section-img {
        max-width: 680px;
    }

    .about-us__cta {
        padding: 120px 0;
        max-width: 240px;
    }
}

/* --- 2.2 max-width: 1280px --- */
@media (max-width: 1280px) {
    .about-us__section--one {
        grid-template-columns: 520px 1fr;
    }

    .about-us__section-desc {
        font-size: var(--font-size-2xl);
        padding: 48px;
    }

    .about-us__section--two {
        grid-template-columns: 1fr 520px;
    }
}

/* --- 2.3 平板/手机 max-width: 768px --- */
@media (max-width: 768px) {
    .about-us {
        padding: 40px 0;
    }
    .about-us__title {
        font-size: var(--font-size-title);
        margin-bottom: 60px;
    }
    .about-us__content {
        flex-direction: column;
        align-items: center;
        gap: 1.5rem;
        text-align: center;
    }
    .about-us__icon {
        max-width: 100px;
    }
    .about-us__desc {
        font-size: var(--font-size-lg);
    }
    .about-us__section--one {
        grid-template-columns: 1fr;
    }
    .about-us__section-desc {
        font-size: var(--font-size-lead);
        padding: 24px 20px;
    }
    .about-us__section--two {
        grid-template-columns: 1fr;
    }
    .about-us__section--two .about-us__section-img,
    .about-us__section--two .about-us__section-img img {
        height: auto;
    }
    .about-us__section--three {
        padding: 40px 0;
    }
    .about-us__section--three .about-us__section-img {
        max-width: 100%;
    }
    .about-us__cta {
        padding: 80px 0;
        max-width: 200px;
    }
}

/* --- 2.4 小屏 max-width: 480px --- */
@media (max-width: 480px) {
    .about-us {
        padding: 28px 0;
    }

    .about-us__title {
        font-size: var(--font-size-2xl);
        margin-bottom: 40px;
    }

    .about-us__icon {
        max-width: 80px;
    }

    .about-us__desc {
        font-size: var(--font-size-lead);
    }

    .about-us__section-desc {
        font-size: var(--font-size-body);
        padding: 20px 16px;
    }

    .about-us__section--three {
        padding: 28px 0;
        flex-direction: column;
    }

    .about-us__cta {
        padding: 60px 0;
        max-width: 160px;
    }
}