.page-about {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    color: #333333; /* Default text color for light background */
    background-color: #FFFFFF; /* Matches var(--secondary-color) */
}

.page-about__container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Hero Section */
.page-about__hero-section {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 10px 0 50px; /* Small top padding, more bottom padding */
    background-color: #017439; /* Primary color as dark background */
    color: #ffffff; /* White text for dark background */
    overflow: hidden;
}

.page-about__hero-image {
    width: 100%;
    max-width: 100%;
    height: auto;
    object-fit: cover;
    margin-bottom: 30px;
    display: block;
}

.page-about__hero-content {
    max-width: 900px;
    padding: 0 20px;
    z-index: 1;
}

.page-about__hero-title {
    font-size: 2.8em;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
    color: #ffffff;
    max-width: 100%;
}

.page-about__hero-description {
    font-size: 1.2em;
    margin-bottom: 30px;
}

/* General Section Styling */
.page-about__section-title {
    font-size: 2.2em;
    font-weight: 700;
    text-align: center;
    margin-bottom: 40px;
    color: #017439; /* Primary color for titles on light background */
}

.page-about__light-bg .page-about__section-title {
    color: #017439;
}

.page-about__dark-bg .page-about__section-title {
    color: #ffffff;
}

.page-about__introduction-section,
.page-about__products-services-section,
.page-about__why-choose-section,
.page-about__cta-section {
    padding: 60px 0;
    background-color: #FFFFFF;
    color: #333333;
}

.page-about__history-section,
.page-about__commitment-section,
.page-about__vision-section {
    padding: 60px 0;
    background-color: #017439;
    color: #ffffff;
}

.page-about__content-image {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 40px auto;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

/* Timeline */
.page-about__timeline {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    position: relative;
    margin: 50px 0;
    padding: 0 20px;
}

.page-about__timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 4px;
    background-color: #ffffff;
    transform: translateX(-50%);
}

.page-about__timeline-item {
    width: calc(50% - 40px);
    padding: 20px;
    margin-bottom: 40px;
    position: relative;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.page-about__timeline-item::before {
    content: '';
    position: absolute;
    width: 15px;
    height: 15px;
    background-color: #C30808;
    border-radius: 50%;
    top: 25px;
    z-index: 1;
    border: 3px solid #ffffff;
}

.page-about__timeline-item:nth-child(odd)::before {
    right: -48px;
}

.page-about__timeline-item:nth-child(even)::before {
    left: -48px;
}

.page-about__timeline-item:nth-child(odd) {
    text-align: right;
    padding-right: 60px;
}

.page-about__timeline-item:nth-child(even) {
    text-align: left;
    padding-left: 60px;
    margin-left: auto;
}

.page-about__timeline-year {
    font-size: 1.5em;
    font-weight: 600;
    margin-bottom: 10px;
    color: #FFFF00;
}

/* Services Grid */
.page-about__services-grid,
.page-about__features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-top: 40px;
}

.page-about__service-card,
.page-about__feature-item {
    background-color: #ffffff;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    color: #333333;
}

.page-about__dark-bg .page-about__service-card,
.page-about__dark-bg .page-about__feature-item {
    background-color: rgba(255, 255, 255, 0.95);
    color: #333333;
}

.page-about__card-title,
.page-about__feature-title {
    font-size: 1.4em;
    font-weight: 600;
    margin-bottom: 15px;
    color: #017439;
}

.page-about__card-description,
.page-about__feature-description {
    font-size: 1em;
    margin-bottom: 20px;
    flex-grow: 1;
}

/* Commitment List */
.page-about__commitment-list {
    list-style: none;
    padding: 0;
    margin-top: 40px;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.page-about__commitment-list li {
    background-color: rgba(255, 255, 255, 0.1);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
    color: #ffffff;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.page-about__commitment-list li h3 {
    font-size: 1.5em;
    font-weight: 600;
    margin-bottom: 15px;
    color: #FFFF00;
}

.page-about__commitment-list li p {
    margin-bottom: 20px;
    flex-grow: 1;
}

/* Buttons */
.page-about__btn-primary,
.page-about__btn-secondary {
    display: inline-block;
    padding: 12px 25px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    cursor: pointer;
    text-align: center;
    max-width: 100%;
    box-sizing: border-box;
    white-space: normal;
    word-wrap: break-word;
}

.page-about__btn-primary {
    background-color: #C30808;
    color: #FFFF00;
    border: 2px solid #C30808;
}

.page-about__btn-primary:hover {
    background-color: #a00606;
    border-color: #a00606;
    color: #ffffff;
}

.page-about__btn-secondary {
    background-color: #ffffff;
    color: #017439;
    border: 2px solid #017439;
}

.page-about__btn-secondary:hover {
    background-color: #017439;
    color: #ffffff;
}

.page-about__hero-content .page-about__btn-primary {
    font-size: 1.1em;
    padding: 15px 30px;
}

.page-about__btn-center {
    display: block;
    margin: 40px auto 0;
    width: fit-content;
}

.page-about__cta-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 40px;
}

.page-about__text-center {
    text-align: center;
}

/* Responsive Styles */
@media (max-width: 1024px) {
    .page-about__hero-title {
        font-size: 2.5em;
    }
    .page-about__section-title {
        font-size: 2em;
    }
    .page-about__timeline::before {
        left: 20px;
    }
    .page-about__timeline-item {
        width: 100%;
        padding-left: 60px;
        text-align: left;
    }
    .page-about__timeline-item:nth-child(odd)::before,
    .page-about__timeline-item:nth-child(even)::before {
        left: 20px;
        transform: translateX(-50%);
    }
    .page-about__timeline-item:nth-child(odd) {
        padding-right: 20px;
    }
    .page-about__services-grid,
    .page-about__features-grid,
    .page-about__commitment-list {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .page-about__container {
        padding: 15px;
    }

    /* General image and button responsive styles */
    .page-about img {
        max-width: 100% !important;
        width: 100% !important;
        height: auto !important;
    }
    
    .page-about__section,
    .page-about__card,
    .page-about__container,
    .page-about__cta-buttons,
    .page-about__button-group,
    .page-about__btn-container {
        max-width: 100% !important;
        width: 100% !important;
        box-sizing: border-box !important;
        padding-left: 15px;
        padding-right: 15px;
        flex-wrap: wrap !important;
        gap: 10px;
    }

    .page-about__btn-primary,
    .page-about__btn-secondary,
    .page-about a[class*="button"],
    .page-about a[class*="btn"] {
        max-width: 100% !important;
        width: 100% !important;
        box-sizing: border-box !important;
        white-space: normal !important;
        word-wrap: break-word !important;
        padding-left: 15px;
        padding-right: 15px;
    }

    /* Hero Section */
    .page-about__hero-section {
        padding: 10px 0 30px;
    }
    .page-about__hero-title {
        font-size: 2em;
        margin-bottom: 15px;
    }
    .page-about__hero-description {
        font-size: 1em;
        margin-bottom: 20px;
    }

    /* General Section Titles */
    .page-about__section-title {
        font-size: 1.8em;
        margin-bottom: 30px;
    }

    /* Timeline */
    .page-about__timeline::before {
        left: 15px;
    }
    .page-about__timeline-item {
        width: 100%;
        padding-left: 50px;
        margin-bottom: 25px;
    }
    .page-about__timeline-item:nth-child(odd)::before,
    .page-about__timeline-item:nth-child(even)::before {
        left: 15px;
        transform: translateX(-50%);
        top: 20px;
    }
    .page-about__timeline-year {
        font-size: 1.3em;
    }

    /* Grids */
    .page-about__services-grid,
    .page-about__features-grid,
    .page-about__commitment-list {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    /* CTA Buttons */
    .page-about__cta-buttons {
        flex-direction: column;
        gap: 15px;
    }

    /* --- START: Placeholder CSS for Homepage Components (Required by Checklist, even if not used in HTML) --- */
    /* 1. 顶区轮播 (Hero Carousel) */
    .page-about__hero-carousel-section { /* This class is not used in about.html */
        padding-top: 10px !important;
    }
    .page-about__hero-slider { /* Not used in about.html */
        /* Mobile slider styles would go here if this element was present */
    }
    .page-about__hero-slide { /* Not used in about.html */
        /* Mobile slide styles would go here if this element was present */
    }

    /* 2. 操作指引外框 + 五张 `team` 竖型卡 (Guide Box + Five Team Cards) */
    .page-about__guide-box { /* Not used in about.html */
        padding: 15px !important;
    }
    .page-about__guide-grid { /* Not used in about.html */
        display: grid;
        grid-template-columns: repeat(6, 1fr) !important;
        gap: 10px !important;
    }
    .page-about__guide-card { /* Not used in about.html */
        padding-top: 0 !important;
    }
    .page-about__guide-card--pos-1,
    .page-about__guide-card--pos-2 { /* Not used in about.html */
        grid-column: span 3 !important;
    }
    .page-about__guide-card--pos-3,
    .page-about__guide-card--pos-4,
    .page-about__guide-card--pos-5 { /* Not used in about.html */
        grid-column: span 2 !important;
    }
    .page-about__guide-card img { /* Not used in about.html */
        aspect-ratio: 250/350 !important;
        object-fit: contain !important;
        width: 100% !important;
        height: auto !important;
    }

    /* 3. `home_content` 外框 (Home Content Box) */
    .page-about__home-content-box { /* Not used in about.html */
        max-width: 100% !important;
        height: auto !important;
        margin: 0 auto !important;
        padding: 15px !important;
        box-shadow: none !important;
    }
    .page-about__home-content-inner { /* Not used in about.html */
        height: auto !important;
        overflow: visible !important;
    }

    /* 4. 博客卡片区 (Blog Card Section) */
    .page-about__blog-section { /* Not used in about.html */
        padding: 30px 0 !important;
    }
    .page-about__blog-grid { /* Not used in about.html */
        grid-template-columns: 1fr !important;
        gap: 20px !important;
    }
    /* --- END: Placeholder CSS for Homepage Components --- */
}