:root {
    --main-color: #11A84E; /* 主色调 */
    --secondary-color: #22C768; /* 辅助色 */
    --button: linear-gradient(180deg, #2AD16F 0%, #13994A 100%); /* 按钮 */
    --card-bg: #11271B; /* Card BG */
    --background: #08160F; /* 背景 */
    --text-main: #F2FFF6; /* Text Main */
    --text-secondary: #A7D9B8; /* Text Secondary */
    --border: #2E7A4E; /* 边框 */
    --glow: #57E38D; /* Glow */
    --glow-rgb: 87, 227, 141; /* RGB for glow shadow */
    --gold: #F2C14E; /* Gold */
    --divider: #1E3A2A; /* Divider */
    --deep-green: #0A4B2C; /* Deep Green */
}

/* --- Base Styles & Layout --- */
.page-download {
    font-family: Arial, sans-serif;
    color: var(--text-main); /* Default text color from custom palette */
    background-color: var(--background); /* Default background color from custom palette */
}

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

.page-download__hero-section {
    position: relative;
    padding: 60px 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    overflow: hidden; /* Ensure content doesn't spill */
    padding-top: 10px; /* Small top padding, body handles --header-offset */
}

.page-download__hero-image-wrapper {
    width: 100%;
    max-height: 700px; /* Limit hero image height */
    overflow: hidden;
    margin-bottom: 30px;
}

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

.page-download__hero-content {
    max-width: 900px;
    margin-top: 20px;
}

.page-download__main-title {
    font-size: clamp(2em, 4vw, 3em); /* Responsive font size */
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-main);
    margin-bottom: 20px;
    max-width: 90%; /* Prevent title from being too wide on large screens */
    margin-left: auto;
    margin-right: auto;
}

.page-download__description {
    font-size: 1.1em;
    line-height: 1.6;
    color: var(--text-secondary);
    margin-bottom: 30px;
}

.page-download__cta-buttons {
    display: flex;
    flex-wrap: wrap; /* Allow wrapping on smaller screens */
    justify-content: center;
    gap: 20px;
    margin-top: 30px;
    width: 100%; /* Ensure container takes full width for responsive buttons */
    box-sizing: border-box;
}

.page-download__btn-primary,
.page-download__btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 15px 30px;
    border-radius: 8px;
    font-size: 1.1em;
    font-weight: 700;
    text-decoration: none;
    transition: all 0.3s ease;
    min-width: 200px; /* Minimum width for buttons */
    box-sizing: border-box;
    white-space: normal; /* Allow text to wrap */
    word-wrap: break-word;
    text-align: center;
}

.page-download__btn-primary {
    background: var(--button); /* Custom button gradient */
    color: var(--text-main); /* White text for primary button */
    border: 2px solid transparent;
}

.page-download__btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(var(--glow-rgb), 0.4);
}

.page-download__btn-secondary {
    background: transparent;
    color: var(--text-main); /* Green text for secondary button */
    border: 2px solid var(--border); /* Custom border color */
}

.page-download__btn-secondary:hover {
    background: var(--deep-green); /* Darker green on hover */
    color: var(--text-main);
}

.page-download__section-title {
    font-size: clamp(1.8em, 3.5vw, 2.5em); /* Responsive font size */
    font-weight: 700;
    color: var(--text-main);
    text-align: center;
    margin-bottom: 40px;
    padding-top: 40px;
}

.page-download__text-block {
    font-size: 1em;
    line-height: 1.6;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 30px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

/* --- Why App Section --- */
.page-download__why-app-section {
    background-color: var(--card-bg); /* Custom card background */
    padding: 60px 0;
}

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

.page-download__feature-card {
    background-color: var(--background); /* Lighter background for feature cards */
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease;
    border: 1px solid var(--divider);
}

.page-download__feature-card:hover {
    transform: translateY(-5px);
}

.page-download__feature-icon {
    width: 200px; /* Min size 200x200 */
    height: 200px; /* Min size 200x200 */
    object-fit: contain;
    margin-bottom: 20px;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

.page-download__feature-title {
    font-size: 1.4em;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 15px;
}

.page-download__feature-text {
    font-size: 0.95em;
    line-height: 1.6;
    color: var(--text-secondary);
}

/* --- How To Download Section --- */
.page-download__how-to-download-section {
    padding: 60px 0;
}

.page-download__download-guide {
    margin-bottom: 50px;
}

.page-download__guide-subtitle {
    font-size: 1.6em;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 25px;
    text-align: center;
}

.page-download__guide-list {
    list-style: none;
    padding: 0;
    counter-reset: step-counter;
    max-width: 800px;
    margin: 0 auto;
}

.page-download__guide-item {
    background-color: var(--card-bg);
    border-left: 5px solid var(--main-color);
    padding: 20px 25px;
    margin-bottom: 15px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
    display: flex;
    flex-direction: column;
    gap: 10px;
    font-size: 1.05em;
    line-height: 1.6;
    color: var(--text-secondary);
}

.page-download__guide-item::before {
    counter-increment: step-counter;
    content: "Bước " counter(step-counter) ":";
    font-weight: 700;
    color: var(--text-main);
    font-size: 1.1em;
    margin-right: 10px;
}

.page-download__step-number {
    display: none; /* Hide original step number, use ::before */
}

.page-download__guide-image {
    width: 100%;
    max-width: 400px; /* Constrain image width within guide item */
    height: auto;
    display: block;
    margin: 15px auto 0;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

/* --- App Features Section --- */
.page-download__app-features-section {
    background-color: var(--card-bg);
    padding: 60px 0;
}

.page-download__features-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
}

.page-download__feature-item {
    background-color: var(--background);
    border-radius: 12px;
    padding: 25px;
    text-align: center;
    box-shadow: 0 3px 12px rgba(0, 0, 0, 0.18);
    border: 1px solid var(--divider);
}

.page-download__small-icon {
    width: 200px; /* Min size 200x200 */
    height: 200px; /* Min size 200x200 */
    object-fit: contain;
    margin-bottom: 15px;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

.page-download__feature-item-title {
    font-size: 1.3em;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 10px;
}

.page-download__feature-item-text {
    font-size: 0.9em;
    line-height: 1.5;
    color: var(--text-secondary);
}

/* --- Security Section --- */
.page-download__security-section {
    padding: 60px 0;
    text-align: center;
}

/* --- FAQ Section --- */
.page-download__faq-section {
    background-color: var(--card-bg);
    padding: 60px 0;
}

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

.page-download__faq-item {
    background-color: var(--background);
    border-radius: 8px;
    margin-bottom: 15px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    border: 1px solid var(--divider);
    overflow: hidden; /* Ensure content doesn't spill */
}

.page-download__faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 25px;
    font-size: 1.15em;
    font-weight: 600;
    color: var(--text-main);
    cursor: pointer;
    background-color: var(--card-bg); /* Slightly different background for question */
    border-bottom: 1px solid var(--divider);
    user-select: none;
}

.page-download__faq-question::-webkit-details-marker {
    display: none;
}

.page-download__faq-question::marker {
    display: none;
}

.page-download__faq-toggle {
    font-size: 1.5em;
    line-height: 1;
    color: var(--main-color);
    margin-left: 15px;
    transition: transform 0.3s ease;
}

.page-download__faq-item[open] .page-download__faq-toggle {
    transform: rotate(45deg); /* Rotate '+' to 'x' or just change to '-' */
}

.page-download__faq-answer {
    padding: 0 25px 20px;
    font-size: 1em;
    line-height: 1.6;
    color: var(--text-secondary);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
}

.page-download__faq-item[open] .page-download__faq-answer {
    max-height: 500px; /* Adjust as needed for content */
    transition: max-height 0.5s ease-in;
}

.page-download__faq-answer p {
    margin-top: 15px;
    margin-bottom: 0;
}

/* --- Bottom CTA Section --- */
.page-download__cta-bottom-section {
    padding: 60px 0;
    text-align: center;
}


/* --- Responsive Adjustments --- */
@media (max-width: 1024px) {
    .page-download__hero-section {
        padding: 40px 0;
    }

    .page-download__main-title {
        font-size: clamp(1.8em, 4.5vw, 2.5em);
    }

    .page-download__section-title {
        font-size: clamp(1.6em, 4vw, 2.2em);
    }

    .page-download__cta-buttons {
        flex-direction: column;
        gap: 15px;
        padding: 0 15px; /* Add padding to prevent overflow */
    }

    .page-download__btn-primary,
    .page-download__btn-secondary {
        width: 100%;
        max-width: 400px; /* Max width for buttons on tablets */
        margin: 0 auto;
    }

    .page-download__features-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }
}

@media (max-width: 768px) {
    .page-download__hero-section {
        padding: 30px 0;
        padding-top: 10px !important; /* body handles --header-offset, this is for visual spacing */
    }

    .page-download__hero-image-wrapper {
        margin-bottom: 20px;
    }

    .page-download__main-title {
        font-size: clamp(1.6em, 7vw, 2.2em);
        padding: 0 15px;
    }

    .page-download__description {
        font-size: 1em;
        padding: 0 15px;
    }

    .page-download__section-title {
        font-size: clamp(1.5em, 6vw, 2em);
        margin-bottom: 30px;
        padding: 0 15px;
    }

    .page-download__text-block {
        font-size: 0.95em;
        padding: 0 15px;
    }

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

    /* Images responsiveness */
    .page-download img {
        max-width: 100% !important;
        width: 100% !important;
        height: auto !important;
        display: block !important;
    }

    /* All containing elements for images */
    .page-download__hero-image-wrapper,
    .page-download__feature-card,
    .page-download__guide-item,
    .page-download__feature-item,
    .page-download__download-guide {
        max-width: 100% !important;
        width: 100% !important;
        box-sizing: border-box !important;
        padding-left: 0;
        padding-right: 0;
        overflow: hidden !important;
    }

    .page-download__feature-icon,
    .page-download__small-icon {
        width: 200px !important; /* Min size */
        height: 200px !important; /* Min size */
        margin: 0 auto 15px auto !important;
    }

    .page-download__guide-image {
        max-width: 100% !important;
        width: 100% !important;
        height: auto !important;
    }

    /* Buttons responsiveness */
    .page-download__cta-buttons {
        flex-direction: column !important;
        gap: 15px !important;
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        padding: 0 15px !important; /* Ensure padding for buttons */
        overflow: hidden !important;
    }

    .page-download__btn-primary,
    .page-download__btn-secondary,
    .page-download a[class*="button"],
    .page-download 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; /* Inner padding for text */
        padding-right: 15px !important; /* Inner padding for text */
    }

    .page-download__faq-question {
        font-size: 1em;
        padding: 15px 20px;
    }

    .page-download__faq-answer {
        padding: 0 20px 15px;
    }
}