.page-about {
    color: #F3F8FF; /* Text Main for dark body background */
    font-family: Arial, sans-serif;
    line-height: 1.6;
}

.page-about__container {
    max-width: 1150px;
    margin: 0 auto;
    padding: 20px;
    box-sizing: border-box;
}

.page-about__hero-section {
    padding-top: 10px; /* Small top padding as shared.css handles body padding */
    padding-bottom: 50px;
    text-align: center;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.page-about__dark-section {
    background-color: #08162B; /* Deep Navy background */
    color: #F3F8FF;
}

.page-about__hero-image-wrapper {
    width: 100%;
    max-height: 675px;
    overflow: hidden;
}

.page-about__hero-image {
    width: 100%;
    height: auto;
    display: block;
    object-fit: cover;
    object-position: center;
}

.page-about__hero-content {
    padding: 30px 20px;
    max-width: 900px;
    margin-top: 20px;
}

.page-about__main-title {
    font-size: 2.8em;
    font-weight: 700;
    margin-bottom: 20px;
    color: #F2C14E; /* Gold for main title */
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.page-about__description {
    font-size: 1.1em;
    margin-bottom: 30px;
    color: #AFC4E8; /* Text Secondary */
}

.page-about__hero-cta-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.page-about__btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 28px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.05em;
    transition: background-color 0.3s ease, transform 0.2s ease;
    white-space: normal;
    word-wrap: break-word;
    text-align: center;
    box-sizing: border-box;
    max-width: 100%;
    min-width: 180px;
}

.page-about__btn-primary {
    background: linear-gradient(180deg, #2B73F6 0%, #1144A6 100%);
    color: #F3F8FF; /* Text Main */
    border: 2px solid transparent;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.page-about__btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

.page-about__btn-secondary {
    background-color: transparent;
    color: #4FA8FF; /* Glow color */
    border: 2px solid #2B73F6;
}

.page-about__btn-secondary:hover {
    background-color: rgba(43, 115, 246, 0.1);
    transform: translateY(-2px);
}

.page-about__section {
    padding: 60px 0;
}

.page-about__section-title {
    font-size: 2.2em;
    font-weight: 700;
    margin-bottom: 30px;
    text-align: center;
    color: #F2C14E; /* Gold for section titles */
}

.page-about__overview-section {
    background-color: #08162B;
}

.page-about__text-block {
    font-size: 1.05em;
    color: #AFC4E8; /* Text Secondary */
    margin-bottom: 20px;
    text-align: justify;
}

.page-about__values-section {
    padding-top: 80px;
    padding-bottom: 80px;
}

.page-about__grid-layout {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 40px;
    margin-bottom: 40px;
}

.page-about__grid-item {
    display: flex;
    flex-direction: column;
}

.page-about__card {
    background-color: #10233F; /* Card BG */
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
    color: #F3F8FF; /* Text Main */
    border: 1px solid #244D84; /* Border color */
    height: 100%;
    box-sizing: border-box;
}

.page-about__card-title {
    font-size: 1.6em;
    font-weight: 600;
    margin-bottom: 15px;
    color: #4FA8FF; /* Glow color */
}

.page-about__card-text {
    font-size: 1em;
    color: #AFC4E8; /* Text Secondary */
    line-height: 1.5;
}

.page-about__value-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.page-about__value-list li {
    margin-bottom: 10px;
    font-size: 1em;
    color: #AFC4E8;
}

.page-about__value-list li strong {
    color: #F3F8FF;
}

.page-about__image-block {
    text-align: center;
    margin-top: 30px;
    margin-bottom: 30px;
}

.page-about__content-image {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    display: block;
    margin: 0 auto;
}

.page-about__products-section {
    background-color: #08162B;
}

.page-about__product-list {
    list-style: none;
    padding: 0;
    margin: 30px 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.page-about__product-list li {
    background-color: #10233F;
    padding: 20px;
    border-radius: 10px;
    font-size: 1.05em;
    color: #F3F8FF;
    border-left: 4px solid #4FA8FF;
    box-shadow: 0 2px 10px rgba(0,0,0,0.15);
}

.page-about__product-list li strong {
    color: #F2C14E;
}

.page-about__cta-buttons {
    margin-top: 40px;
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.page-about__security-section {
    padding-top: 80px;
    padding-bottom: 80px;
}

.page-about__sub-title {
    font-size: 1.8em;
    font-weight: 600;
    margin-bottom: 20px;
    color: #F2C14E; /* Gold for sub-titles */
}

.page-about__security-features, .page-about__support-channels {
    list-style: disc;
    padding-left: 25px;
    margin-top: 20px;
    margin-bottom: 20px;
    color: #AFC4E8;
}

.page-about__security-features li, .page-about__support-channels li {
    margin-bottom: 8px;
    font-size: 1em;
}

.page-about__contact-cta {
    margin-top: 60px;
}

.page-about__commitment-section {
    background-color: #08162B;
}

.page-about__responsibility-list {
    list-style: decimal;
    padding-left: 25px;
    margin: 30px 0;
    color: #AFC4E8;
}

.page-about__responsibility-list li {
    margin-bottom: 10px;
    font-size: 1em;
}

.page-about__join-us-section {
    padding-top: 80px;
    padding-bottom: 80px;
}

.page-about__features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin-top: 40px;
    margin-bottom: 50px;
}

.page-about__feature-item {
    text-align: center;
}

.page-about__feature-title {
    font-size: 1.4em;
    font-weight: 600;
    margin-bottom: 10px;
    color: #4FA8FF; /* Glow color */
}

.page-about__feature-text {
    font-size: 0.95em;
    color: #AFC4E8; /* Text Secondary */
}

.page-about__final-cta {
    margin-top: 50px;
}

/* --- Responsive Styles --- */

@media (max-width: 1024px) {
    .page-about__main-title {
        font-size: 2.4em;
    }
    .page-about__section-title {
        font-size: 2em;
    }
    .page-about__container {
        padding: 15px;
    }
    .page-about__grid-layout {
        grid-template-columns: 1fr;
    }
    .page-about__products-section .page-about__product-list {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }
    .page-about__features-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }
}

@media (max-width: 768px) {
    .page-about {
        font-size: 16px;
        line-height: 1.6;
    }

    /* 1. 顶区标题 + 双 CTA */
    .page-about__hero-section {
        padding-top: 10px !important; /* Small top padding */
        padding-bottom: 30px;
    }
    .page-about__main-title {
        font-size: clamp(1.8em, 6vw, 2.2em) !important; /* Clamp for H1 */
        margin-bottom: 15px;
    }
    .page-about__description {
        font-size: 1em;
        margin-bottom: 25px;
    }
    .page-about__hero-cta-buttons {
        flex-direction: column !important;
        gap: 10px;
        padding: 0 15px;
    }
    .page-about__btn {
        width: 100% !important;
        max-width: 100% !important;
        padding: 12px 20px !important;
        font-size: 1em !important;
        box-sizing: border-box !important;
        white-space: normal !important;
        word-wrap: break-word !important;
    }

    /* 2. 单栏长文容器 */
    .page-about__container {
        padding-left: 15px !important;
        padding-right: 15px !important;
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
    }
    .page-about__section-title {
        font-size: 1.8em !important;
        margin-bottom: 25px;
    }
    .page-about__text-block {
        font-size: 1em;
        margin-bottom: 15px;
    }
    .page-about__card {
        padding: 20px !important;
        border-radius: 8px !important;
    }
    .page-about__card-title {
        font-size: 1.4em !important;
    }
    .page-about__card-text {
        font-size: 0.95em !important;
    }

    /* 3. 通用图片与 figure */
    .page-about img {
        max-width: 100% !important;
        width: 100% !important;
        height: auto !important;
        border-radius: 6px !important;
        box-shadow: 0 2px 8px rgba(0,0,0,0.1) !important;
    }
    .page-about__image-block {
        margin-top: 20px;
        margin-bottom: 20px;
    }

    /* 4. 按钮与按钮容器 */
    .page-about__cta-buttons {
        flex-direction: column !important;
        gap: 10px;
        padding: 0 15px;
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        overflow: hidden !important;
    }
    .page-about__cta-buttons .page-about__btn {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        white-space: normal !important;
        word-wrap: break-word !important;
        padding-left: 15px !important;
        padding-right: 15px !important;
    }

    /* 5. 注册教程与 FAQ 区块 (Not explicitly in this 'About Us' page, but general rule for future pages) */
    /* Placeholder for future expansion, ensuring rule compliance */
    .page-about__product-list, .page-about__responsibility-list, .page-about__security-features, .page-about__support-channels {
        padding-left: 20px !important;
    }
    .page-about__product-list li, .page-about__responsibility-list li, .page-about__security-features li, .page-about__support-channels li {
        font-size: 0.95em !important;
    }
    .page-about__sub-title {
        font-size: 1.6em !important;
    }
    .page-about__features-grid {
        grid-template-columns: 1fr !important;
        gap: 20px;
    }
    .page-about__feature-title {
        font-size: 1.2em !important;
    }
    .page-about__feature-text {
        font-size: 0.9em !important;
    }
}

@media (max-width: 480px) {
    .page-about__main-title {
        font-size: clamp(1.6em, 8vw, 2em) !important;
    }
    .page-about__section-title {
        font-size: 1.6em !important;
    }
    .page-about__sub-title {
        font-size: 1.4em !important;
    }
}