/* CHANGHAI blue-silver brand refinement. */
.ch-about {
    --red: #0b4f83;
    --ch-blue: #0b4f83;
    --ch-blue-dark: #062844;
    --ch-blue-black: #071b2a;
    --ch-blue-light: #3779a8;
    --ch-silver: #aebbc6;
    --ch-silver-soft: #edf1f4;
}

.ch-about__hero,
.ch-about__section--soft {
    background-image:
        linear-gradient(rgba(11, 79, 131, 0.025) 1px, transparent 1px),
        linear-gradient(90deg, rgba(11, 79, 131, 0.025) 1px, transparent 1px);
    background-size: 36px 36px;
}

.ch-about__hero-panel {
    border-top: 3px solid var(--ch-blue);
    background:
        linear-gradient(145deg, rgba(11, 79, 131, 0.18), transparent 42%),
        #0b0c0f;
}

.ch-about__hero-panel::after {
    content: "PROJECT DELIVERY / STATUS VISIBLE";
    margin-top: 30px;
    padding-top: 13px;
    color: rgba(255, 255, 255, 0.48);
    border-top: 1px solid rgba(174, 187, 198, 0.3);
    font-size: 0.62rem;
    font-weight: 700;
    letter-spacing: 0.11em;
}

.ch-about__button--red {
    background: var(--ch-blue);
    border-color: var(--ch-blue);
}

.ch-about__button--red:hover,
.ch-about__button--red:focus-visible {
    background: var(--ch-blue-dark);
    border-color: var(--ch-blue-dark);
}

.ch-about__promise-grid,
.ch-about__cards,
.ch-about__proof,
.ch-about__responsibility {
    border-color: rgba(174, 187, 198, 0.72);
}

.ch-about__promise-grid > div,
.ch-about__cards article,
.ch-about__proof > div,
.ch-about__responsibility > div + div {
    border-color: rgba(174, 187, 198, 0.72);
}

.ch-about__promise-grid > div:nth-child(4) span {
    color: #b64949;
}

.ch-about__founder-grid {
    grid-template-columns: minmax(220px, 264px) minmax(0, 1fr);
    gap: clamp(54px, 8vw, 100px);
    align-items: start;
}

.ch-about__founder-mark {
    width: 100%;
    max-width: 264px;
    overflow: hidden;
    background: #fff;
    border: 1px solid rgba(85, 109, 128, 0.2);
    border-radius: 16px;
    box-shadow: 0 15px 38px rgba(6, 40, 68, 0.08);
}

.ch-about__founder-mark > img {
    width: 100%;
    min-height: 0;
    aspect-ratio: 4 / 4.6;
    display: block;
    object-fit: cover;
    object-position: center 14%;
    filter: grayscale(6%) contrast(1.02);
}

.ch-about__founder-mark > span {
    min-height: 304px;
}

.ch-about__founder-mark > div {
    border: 0;
    border-top: 2px solid var(--ch-blue);
    padding: 20px 22px;
}

.ch-about__founder-mark > div strong {
    font-size: 1rem;
}

.ch-about__founder-mark > div small {
    margin-top: 3px;
    font-size: 0.78rem;
}

.ch-about__proof strong {
    color: var(--ch-blue-dark);
    font-size: 1.2rem;
}

.ch-about__section--dark {
    background:
        linear-gradient(120deg, rgba(11, 79, 131, 0.2), transparent 38%),
        var(--ch-blue-black);
}

.ch-about__principles > div {
    border-color: rgba(174, 187, 198, 0.22);
}

.ch-about__cta {
    background:
        linear-gradient(118deg, #062844 0%, #0a3858 58%, #071b2a 100%);
    border-top: 1px solid rgba(174, 187, 198, 0.25);
}

.ch-about__cta .ch-about__eyebrow {
    color: #b8d4e8 !important;
    opacity: 1;
}

.ch-about__button--light {
    color: var(--ch-blue-dark) !important;
    background: #fff;
    border-color: rgba(255, 255, 255, 0.8);
    box-shadow: 0 8px 22px rgba(0, 0, 0, 0.12);
}

.ch-about__button--light:hover,
.ch-about__button--light:focus-visible {
    color: #fff !important;
    background: var(--ch-blue);
    border-color: var(--ch-blue);
}

@media (max-width: 900px) {
    .ch-about__founder-grid {
        grid-template-columns: minmax(210px, 244px) minmax(0, 1fr);
        gap: 48px;
    }
}

@media (max-width: 640px) {
    .ch-about__founder-grid {
        grid-template-columns: 1fr;
    }

    .ch-about__founder-mark {
        width: min(100%, 244px);
        margin-inline: auto;
    }

    .ch-about h1 {
        max-width: 100%;
        overflow-wrap: normal;
        word-break: normal;
    }

    .ch-about__button {
        min-height: 52px;
    }
}