/* style/about.css */

:root {
    --primary-color: #2F6BFF;
    --secondary-color: #6FA3FF;
    --button-gradient: linear-gradient(180deg, #4A8BFF 0%, #2F6BFF 100%);
    --card-bg: #FFFFFF;
    --page-bg: #F4F7FB;
    --text-main: #1F2D3D;
    --text-dark: #000000;
    --border-color: #D6E2FF;
    --glow-color: #A5C4FF;
}

.page-about {
    font-family: Arial, sans-serif;
    color: var(--text-main);
    background-color: var(--page-bg);
    line-height: 1.6;
}

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

.page-about__hero-section {
    position: relative;
    width: 100%;
    padding-top: 10px; /* Small top padding, body handles header offset */
    padding-bottom: 0;
    overflow: hidden;
    background-color: var(--primary-color);
    color: #ffffff;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.page-about__hero-image {
    width: 100%;
    height: auto;
    display: block;
    object-fit: cover;
    filter: brightness(0.7);
    max-height: 600px; /* Limit height for desktop */
}

.page-about__hero-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 10;
    max-width: 800px;
    padding: 20px;
    background: rgba(0, 0, 0, 0.4); /* Slightly darker overlay for text readability */
    border-radius: 8px;
}

.page-about__main-title {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 15px;
    color: #ffffff;
}

.page-about__hero-description {
    font-size: clamp(1rem, 2vw, 1.25rem);
    margin-bottom: 30px;
    color: #f0f0f0;
}

.page-about__cta-button {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: bold;
    font-size: 1rem;
    transition: all 0.3s ease;
    max-width: 100%;
    box-sizing: border-box;
    white-space: normal;
    word-wrap: break-word;
}

.page-about__btn-primary {
    background: var(--button-gradient);
    color: #ffffff;
    border: 2px solid transparent;
}

.page-about__btn-primary:hover {
    opacity: 0.9;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--glow-color);
}

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

.page-about__btn-secondary:hover {
    background: var(--primary-color);
    color: #ffffff;
    box-shadow: 0 4px 12px var(--glow-color);
}

.page-about__section-title {
    font-size: clamp(2rem, 4vw, 2.8rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: 20px;
    color: var(--text-dark);
}

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

.page-about__sub-title {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 600;
    margin-top: 30px;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.page-about__grid-two-cols {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
    margin-bottom: 40px;
}

.page-about__text-block p {
    margin-bottom: 15px;
    color: var(--text-main);
}

.page-about__image-block img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 12px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    min-width: 200px;
    min-height: 200px;
}

.page-about__mission-vision-section {
    padding: 60px 0;
    background-color: var(--card-bg);
}

.page-about__core-values-section {
    padding: 60px 0;
    background-color: var(--page-bg);
}

.page-about__values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.page-about__value-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.page-about__value-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.page-about__card-title {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--primary-color);
}

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

.page-about__products-overview-section {
    padding: 60px 0;
    background-color: var(--card-bg);
}

.page-about__product-list {
    list-style: none;
    padding-left: 0;
    margin-bottom: 30px;
}

.page-about__product-list li {
    margin-bottom: 15px;
    padding-left: 25px;
    position: relative;
    color: var(--text-main);
}

.page-about__product-list li::before {
    content: '✓';
    color: var(--primary-color);
    position: absolute;
    left: 0;
    font-weight: bold;
}

.page-about__security-section {
    padding: 60px 0;
    background-color: var(--primary-color);
    color: #ffffff;
}

.page-about__security-section .page-about__section-title,
.page-about__security-section .page-about__section-description,
.page-about__security-section .page-about__sub-title,
.page-about__security-section .page-about__text-block p {
    color: #ffffff;
}

.page-about__security-section .page-about__image-block img {
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

.page-about__faq-section {
    padding: 60px 0;
    background-color: var(--page-bg);
}

.page-about__faq-list {
    max-width: 900px;
    margin: 40px auto 0 auto;
}

.page-about__faq-item {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 20px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.page-about__faq-item summary {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    list-style: none;
    color: var(--text-dark);
    background-color: #fcfcfc;
}

.page-about__faq-item summary::-webkit-details-marker {
    display: none;
}

.page-about__faq-item summary:focus {
    outline: none;
}

.page-about__faq-qtext {
    flex-grow: 1;
    color: var(--text-dark);
}

.page-about__faq-toggle {
    font-size: 1.5rem;
    font-weight: bold;
    line-height: 1;
    width: 20px;
    text-align: center;
    color: var(--primary-color);
}

.page-about__faq-item[open] .page-about__faq-toggle {
    content: '−';
}

.page-about__faq-answer {
    padding: 0 20px 20px 20px;
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text-main);
}

.page-about__cta-section {
    padding: 60px 0;
    background-color: var(--primary-color);
    text-align: center;
    color: #ffffff;
}

.page-about__cta-section .page-about__section-title,
.page-about__cta-section .page-about__section-description {
    color: #ffffff;
}

.page-about__cta-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 40px;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    overflow: hidden;
}

/* --- Mobile Responsiveness --- */
@media (max-width: 1024px) {
    .page-about__hero-content {
        max-width: 600px;
        padding: 15px;
    }

    .page-about__main-title {
        font-size: clamp(2rem, 4vw, 3rem);
    }

    .page-about__hero-description {
        font-size: clamp(0.9rem, 1.8vw, 1.1rem);
    }

    .page-about__grid-two-cols {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .page-about__image-block {
        order: -1;
    }

    .page-about__section-title {
        font-size: clamp(1.8rem, 3.5vw, 2.5rem);
    }
}

@media (max-width: 768px) {
    /* 1. HERO 主图区域 */
    .page-about__hero-section {
        padding-top: 10px !important;
        min-height: 400px;
    }
    .page-about__hero-image {
        max-height: 400px;
    }
    .page-about__hero-content {
        position: static;
        transform: none;
        padding: 15px;
        margin: 0 auto;
        background: rgba(0, 0, 0, 0.6);
        width: 100%;
        box-sizing: border-box;
        border-radius: 0;
    }
    .page-about__main-title {
        font-size: 2rem !important;
    }
    .page-about__hero-description {
        font-size: 0.9rem !important;
        margin-bottom: 20px;
    }

    /* 2. 产品展示图区域 (Non-homepage, so general grid styling) */
    .page-about__values-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    /* 3. 通用图片与容器 */
    .page-about img {
        max-width: 100% !important;
        width: 100% !important;
        height: auto !important;
        display: block;
    }
    .page-about__container,
    .page-about__mission-vision-section,
    .page-about__core-values-section,
    .page-about__products-overview-section,
    .page-about__security-section,
    .page-about__faq-section,
    .page-about__cta-section {
        max-width: 100% !important;
        width: 100% !important;
        box-sizing: border-box !important;
        padding-left: 15px !important;
        padding-right: 15px !important;
    }

    /* 4. 按钮与按钮容器 */
    .page-about__cta-button,
    .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 !important;
        padding-right: 15px !important;
    }
    .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: 0 !important;
        padding-right: 0 !important;
        flex-direction: column !important;
        gap: 10px !important;
    }

    /* 5. 其他内容模块 */
    .page-about__section-title {
        font-size: 1.5rem !important;
    }
    .page-about__section-description {
        font-size: 0.95rem !important;
        margin-bottom: 20px;
    }
    .page-about__sub-title {
        font-size: 1.3rem !important;
    }
    .page-about p,
    .page-about li,
    .page-about__faq-answer {
        font-size: 15px !important;
    }
    .page-about__faq-item summary {
        font-size: 1rem !important;
        padding: 15px;
    }
    .page-about__faq-answer {
        padding: 0 15px 15px 15px;
    }
    .page-about__value-card {
        padding: 20px;
    }
    .page-about__card-title {
        font-size: 1.2rem;
    }
    .page-about__product-list li {
        padding-left: 20px;
    }
}