:root {
    --primary-color: #2F6BFF;
    --secondary-color: #6FA3FF;
    --button-gradient: linear-gradient(180deg, #4A8BFF 0%, #2F6BFF 100%);
    --card-bg: #FFFFFF;
    --background-color: #F4F7FB; /* Body background from shared.css */
    --text-main: #1F2D3D;
    --text-custom-black: #000000;
    --border-color: #D6E2FF;
    --glow-color: #A5C4FF;
    --header-offset: 122px; /* Placeholder, actual value from shared.css */
}

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

/* Hero Section */
.page-about__hero-section {
    position: relative;
    overflow: hidden;
    padding-top: 10px; /* Small top padding, body handles --header-offset */
    background-color: var(--primary-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.page-about__hero-image {
    width: 100%;
    max-height: 70vh; /* Limit height for hero image */
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 20px; /* Space between image and content */
}

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

.page-about__hero-content {
    max-width: 900px;
    padding: 0 20px 40px;
    z-index: 1;
    color: var(--card-bg); /* White text for contrast on primary color bg */
}

.page-about__main-title {
    font-size: clamp(2.5rem, 5vw, 3.5rem); /* H1 font size with clamp */
    font-weight: 700;
    margin-bottom: 15px;
    line-height: 1.2;
    color: var(--card-bg);
}

.page-about__intro-description {
    font-size: clamp(1rem, 2vw, 1.2rem);
    margin-bottom: 30px;
    color: var(--card-bg);
}

.page-about__cta-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap; /* Ensure buttons wrap on smaller screens */
    width: 100%; /* For mobile button wrap */
    max-width: 500px; /* Limit button group width */
    margin: 0 auto;
    box-sizing: border-box;
    padding: 0 15px;
}

.page-about__btn-primary,
.page-about__btn-secondary {
    display: inline-block;
    padding: 15px 30px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    cursor: pointer;
    text-align: center;
    white-space: normal; /* Allow text to wrap */
    word-wrap: break-word; /* Allow text to break words */
    box-sizing: border-box;
    max-width: 100%; /* Ensure button doesn't overflow */
}

.page-about__btn-primary {
    background: var(--button-gradient);
    color: var(--card-bg);
    border: none;
}

.page-about__btn-primary:hover {
    opacity: 0.9;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.page-about__btn-secondary {
    background: var(--card-bg);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.page-about__btn-secondary:hover {
    background: var(--primary-color);
    color: var(--card-bg);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

/* General Section Styling */
.page-about__section {
    padding: 60px 0;
    background-color: var(--background-color);
}

.page-about__section--mission,
.page-about__section--why-choose,
.page-about__section--faq,
.page-about__section--contact {
    background-color: var(--background-color);
}

.page-about__dark-bg {
    background-color: var(--primary-color);
    color: var(--card-bg);
}

.page-about__section-title {
    font-size: clamp(2rem, 4vw, 2.8rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: 40px;
    color: var(--text-custom-black);
}

.page-about__section-title--light {
    color: var(--card-bg);
}

.page-about__section-description {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 40px;
    font-size: 1.1rem;
    color: var(--text-main);
}

.page-about__dark-bg .page-about__section-description {
    color: var(--card-bg);
}

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

.page-about__card {
    background: var(--card-bg);
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    padding: 30px;
    text-align: left;
    color: var(--text-main);
}

/* Mission Section */
.page-about__mission-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.page-about__mission-heading {
    font-size: 1.6rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.page-about__mission-text {
    font-size: 1rem;
    color: var(--text-main);
}

/* History Section */
.page-about__history-content {
    max-width: 900px;
    margin: 0 auto 40px;
    font-size: 1.05rem;
    color: var(--text-main);
}

.page-about__history-content p {
    margin-bottom: 1em;
}

.page-about__history-subtitle {
    font-size: 1.4rem;
    font-weight: 600;
    margin-top: 30px;
    margin-bottom: 15px;
    color: var(--primary-color);
}

/* Why Choose Section */
.page-about__advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}

.page-about__advantage-heading {
    font-size: 1.6rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.page-about__advantage-text {
    font-size: 1rem;
    color: var(--text-main);
    margin-bottom: 15px;
}

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

.page-about__game-list li {
    background: var(--background-color);
    padding: 10px 15px;
    border-radius: 5px;
    margin-bottom: 8px;
    font-size: 0.95rem;
    color: var(--text-main);
}

.page-about__cta-buttons--centered {
    margin-top: 50px;
    display: flex;
    justify-content: center;
    gap: 20px;
}

/* Responsibility Section */
.page-about__responsibility-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.page-about__responsibility-item {
    padding: 30px;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.15); /* Slightly transparent white on dark background */
    color: var(--card-bg); /* White text */
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

.page-about__responsibility-heading {
    font-size: 1.6rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--card-bg); /* White text */
}

.page-about__responsibility-text {
    font-size: 1rem;
    color: var(--card-bg); /* White text */
}

/* FAQ Section */
.page-about__faq-list {
    max-width: 900px;
    margin: 0 auto;
}

details.page-about__faq-item {
    margin-bottom: 15px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    overflow: hidden;
    background: var(--card-bg);
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}
details.page-about__faq-item summary.page-about__faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 20px;
    cursor: pointer;
    user-select: none;
    list-style: none;
    transition: background-color 0.3s ease;
    font-weight: 600;
    color: var(--text-main);
}
details.page-about__faq-item summary.page-about__faq-question::-webkit-details-marker {
    display: none;
}
details.page-about__faq-item summary.page-about__faq-question:hover {
    background: #f8f8f8;
}
.page-about__faq-qtext {
    flex: 1;
    font-size: 1.1rem;
    line-height: 1.5;
    text-align: left;
    color: var(--text-main);
}
.page-about__faq-toggle {
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-color);
    flex-shrink: 0;
    margin-left: 15px;
    width: 28px;
    text-align: center;
}
details.page-about__faq-item .page-about__faq-answer {
    padding: 0 20px 20px;
    background: #fcfcfc;
    border-top: 1px solid var(--border-color);
    border-radius: 0 0 8px 8px;
    color: var(--text-main);
}
details.page-about__faq-item .page-about__faq-answer p {
    margin-bottom: 15px;
}
details.page-about__faq-item .page-about__faq-answer .page-about__btn-primary {
    margin-top: 10px;
    display: inline-block;
    width: auto;
    padding: 10px 20px;
    font-size: 1rem;
}

/* Contact Section */
.page-about__section--contact {
    padding-bottom: 80px;
}

.page-about__contact-card {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    padding: 50px 30px;
}

.page-about__contact-card .page-about__section-description {
    margin-bottom: 30px;
}

/* Image styling */
.page-about__content-image {
    display: block;
    max-width: 100%;
    height: auto;
    margin: 40px auto;
    border-radius: 10px;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.1);
}

/* --- Mobile Responsive Styles (max-width: 768px) --- */
@media (max-width: 768px) {
    /* General */
    .page-about {
        font-size: 16px;
        line-height: 1.6;
    }

    .page-about__container {
        padding: 0 15px;
        max-width: 100% !important;
        width: 100% !important;
        box-sizing: border-box !important;
    }

    .page-about__section {
        padding: 40px 0;
    }

    .page-about__section-title {
        font-size: 1.8rem;
        margin-bottom: 30px;
    }

    .page-about__section-description {
        font-size: 1rem;
        margin-bottom: 30px;
        padding: 0 10px;
    }

    /* HERO 主图区域 */
    .page-about__hero-section {
        padding-top: 10px;
        padding-bottom: 30px;
    }

    .page-about__hero-image {
        margin-bottom: 15px;
        max-height: unset;
    }
    
    .page-about__hero-image img {
        max-width: 100% !important;
        height: auto !important;
        object-fit: contain !important; /* Prevent cropping on mobile */
        aspect-ratio: unset !important; /* Reset aspect ratio for object-fit: contain */
    }

    .page-about__hero-content {
        padding: 0 15px 20px;
    }

    .page-about__main-title {
        font-size: 2rem;
        margin-bottom: 10px;
    }

    .page-about__intro-description {
        font-size: 0.95rem;
        margin-bottom: 20px;
    }

    .page-about__cta-buttons {
        flex-direction: column;
        gap: 15px;
        padding: 0 15px;
        max-width: 100% !important;
        width: 100% !important;
        box-sizing: border-box !important;
    }

    /* 按钮与按钮容器 */
    .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: 12px 20px;
        font-size: 1rem;
    }
    
    .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__cta-buttons {
        display: flex;
        flex-direction: column;
    }

    /* Mission Section */
    .page-about__mission-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .page-about__mission-item {
        padding: 25px;
    }

    .page-about__mission-heading {
        font-size: 1.4rem;
    }

    /* History Section */
    .page-about__history-content {
        padding: 0 10px;
        margin-bottom: 30px;
    }

    .page-about__history-subtitle {
        font-size: 1.2rem;
        margin-top: 25px;
    }

    /* Why Choose Section */
    .page-about__advantages-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .page-about__advantage-item {
        padding: 25px;
    }

    .page-about__advantage-heading {
        font-size: 1.4rem;
    }

    .page-about__game-list li {
        padding: 8px 12px;
        font-size: 0.9rem;
    }

    .page-about__cta-buttons--centered {
        margin-top: 30px;
        flex-direction: column;
        gap: 15px;
    }

    /* Responsibility Section */
    .page-about__responsibility-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .page-about__responsibility-item {
        padding: 25px;
    }

    .page-about__responsibility-heading {
        font-size: 1.4rem;
    }

    /* FAQ Section */
    .page-about__faq-list {
        padding: 0 10px;
    }

    details.page-about__faq-item summary.page-about__faq-question {
        padding: 15px;
    }
    .page-about__faq-qtext {
        font-size: 1rem;
    }
    .page-about__faq-toggle {
        font-size: 20px;
        width: 24px;
        margin-left: 10px;
    }
    details.page-about__faq-item .page-about__faq-answer {
        padding: 0 15px 15px;
    }
    details.page-about__faq-item .page-about__faq-answer .page-about__btn-primary {
        width: 100% !important;
        max-width: 100% !important;
        font-size: 0.95rem;
        padding: 10px 15px;
    }

    /* Contact Section */
    .page-about__contact-card {
        padding: 30px 20px;
    }
    
    /* 通用图片与容器 */
    .page-about img {
        max-width: 100% !important;
        width: 100% !important;
        height: auto !important;
        display: block;
    }

    .page-about__section,
    .page-about__card,
    .page-about__container,
    .page-about__text-block {
        max-width: 100% !important;
        width: 100% !important;
        box-sizing: border-box !important;
        padding-left: 15px;
        padding-right: 15px;
    }
    .page-about__text-block {
        padding-left: 15px !important;
        padding-right: 15px !important;
    }
}