/* Tổng quan */
    :root {
        --c54-primary: #1A237E; /* Dark Blue */
        --c54-secondary: #FFD700; /* Gold */
        --c54-text-light: #FFFFFF;
        --c54-text-dark: #333333;
        --c54-bg-light: #F5F5F5;
        --c54-bg-dark: #2C3E50; /* Slightly lighter dark for contrast */
        --c54-accent-hover: #E6C200;
    }

    .page-c54dangnhap {
        font-family: 'Arial', sans-serif;
        color: var(--c54-text-dark);
        line-height: 1.6;
        background-color: var(--c54-bg-light);
    }

    /* Các phần chính */
    .page-c54dangnhap__hero-section {
        position: relative;
        padding-top: var(--header-offset, 120px); /* Đảm bảo không bị che bởi header */
        padding-bottom: 60px;
        color: var(--c54-text-light);
        text-align: center;
        overflow: hidden;
        background: linear-gradient(135deg, var(--c54-primary), #3F51B5);
    }

    .page-c54dangnhap__hero-background {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        object-fit: cover;
        z-index: 1;
        opacity: 0.3;
    }

    .page-c54dangnhap__hero-content {
        position: relative;
        z-index: 2;
        max-width: 900px;
        margin: 0 auto;
        padding: 0 20px;
    }

    .page-c54dangnhap__hero-title {
        font-size: 3.2em;
        margin-bottom: 20px;
        color: var(--c54-text-light);
        text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.4);
        word-wrap: break-word; /* Ensure long titles break */
        overflow-wrap: break-word;
    }

    .page-c54dangnhap__hero-subtitle {
        font-size: 1.4em;
        margin-bottom: 30px;
        color: var(--c54-text-light);
        text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.3);
        word-wrap: break-word;
        overflow-wrap: break-word;
    }

    .page-c54dangnhap__cta-button {
        display: inline-block;
        background-color: var(--c54-secondary);
        color: var(--c54-primary);
        padding: 15px 35px;
        border-radius: 50px;
        font-size: 1.2em;
        font-weight: bold;
        text-decoration: none;
        transition: background-color 0.3s ease, transform 0.3s ease;
        box-shadow: 0 6px 15px rgba(0, 0, 0, 0.3);
        border: none;
        cursor: pointer;
    }

    .page-c54dangnhap__cta-button:hover {
        background-color: var(--c54-accent-hover);
        transform: translateY(-3px);
    }

    .page-c54dangnhap__section {
        padding: 60px 20px;
        max-width: 1200px;
        margin: 0 auto;
        background-color: var(--c54-bg-light);
        box-sizing: border-box;
    }

    .page-c54dangnhap__section--dark {
        background-color: var(--c54-bg-dark);
        color: var(--c54-text-light);
    }

    .page-c54dangnhap__section-title {
        font-size: 2.5em;
        color: var(--c54-primary);
        text-align: center;
        margin-bottom: 40px;
        position: relative;
        word-wrap: break-word;
        overflow-wrap: break-word;
    }

    .page-c54dangnhap__section--dark .page-c54dangnhap__section-title {
        color: var(--c54-secondary);
    }

    .page-c54dangnhap__section-title::after {
        content: '';
        display: block;
        width: 80px;
        height: 4px;
        background-color: var(--c54-secondary);
        margin: 15px auto 0;
        border-radius: 2px;
    }

    .page-c54dangnhap__section--dark .page-c54dangnhap__section-title::after {
        background-color: var(--c54-primary);
    }

    .page-c54dangnhap__content-text {
        font-size: 1.1em;
        text-align: center;
        margin-bottom: 40px;
        max-width: 800px;
        margin-left: auto;
        margin-right: auto;
        word-wrap: break-word;
        overflow-wrap: break-word;
    }

    .page-c54dangnhap__card-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 30px;
    }

    .page-c54dangnhap__card {
        background-color: #FFFFFF;
        border-radius: 12px;
        box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
        padding: 30px;
        text-align: center;
        transition: transform 0.3s ease, box-shadow 0.3s ease;
        box-sizing: border-box;
    }

    .page-c54dangnhap__card:hover {
        transform: translateY(-10px);
        box-shadow: 0 12px 25px rgba(0, 0, 0, 0.15);
    }

    .page-c54dangnhap__card-icon {
        width: 80px; /* Min size 200x200px. This is a placeholder for a larger image, using a smaller visual representation. */
        height: 80px;
        margin-bottom: 20px;
        display: block;
        margin-left: auto;
        margin-right: auto;
        object-fit: contain;
        max-width: 100%;
        height: auto;
    }

    .page-c54dangnhap__card-title {
        font-size: 1.5em;
        color: var(--c54-primary);
        margin-bottom: 15px;
        word-wrap: break-word;
        overflow-wrap: break-word;
    }

    .page-c54dangnhap__card-description {
        font-size: 1em;
        color: var(--c54-text-dark);
        word-wrap: break-word;
        overflow-wrap: break-word;
    }

    .page-c54dangnhap__steps-container {
        display: flex;
        flex-direction: column;
        gap: 30px;
    }

    .page-c54dangnhap__step-item {
        display: flex;
        align-items: center;
        background-color: #FFFFFF;
        border-radius: 12px;
        box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
        padding: 25px;
        box-sizing: border-box;
    }

    .page-c54dangnhap__step-number {
        font-size: 2.5em;
        font-weight: bold;
        color: var(--c54-secondary);
        background-color: var(--c54-primary);
        border-radius: 50%;
        width: 60px;
        height: 60px;
        display: flex;
        justify-content: center;
        align-items: center;
        flex-shrink: 0;
        margin-right: 25px;
    }

    .page-c54dangnhap__step-content {
        flex-grow: 1;
    }

    .page-c54dangnhap__step-title {
        font-size: 1.4em;
        color: var(--c54-primary);
        margin-bottom: 10px;
        word-wrap: break-word;
        overflow-wrap: break-word;
    }

    .page-c54dangnhap__step-description {
        font-size: 1em;
        color: var(--c54-text-dark);
        word-wrap: break-word;
        overflow-wrap: break-word;
    }

    .page-c54dangnhap__troubleshooting-list {
        list-style: none;
        padding: 0;
        margin: 0;
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 20px;
    }

    .page-c54dangnhap__troubleshooting-item {
        background-color: #FFFFFF;
        border-left: 5px solid var(--c54-primary);
        padding: 20px;
        border-radius: 8px;
        box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
        box-sizing: border-box;
    }

    .page-c54dangnhap__troubleshooting-title {
        font-size: 1.3em;
        color: var(--c54-primary);
        margin-bottom: 10px;
        word-wrap: break-word;
        overflow-wrap: break-word;
    }

    .page-c54dangnhap__troubleshooting-text {
        font-size: 0.95em;
        color: var(--c54-text-dark);
        word-wrap: break-word;
        overflow-wrap: break-word;
    }

    .page-c54dangnhap__game-categories {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 25px;
    }

    .page-c54dangnhap__category-item {
        background-color: var(--c54-primary);
        color: var(--c54-text-light);
        border-radius: 12px;
        padding: 25px;
        text-align: center;
        box-shadow: 0 6px 15px rgba(0, 0, 0, 0.2);
        transition: transform 0.3s ease, background-color 0.3s ease;
        box-sizing: border-box;
    }

    .page-c54dangnhap__category-item:hover {
        transform: translateY(-8px);
        background-color: #3F51B5;
    }

    .page-c54dangnhap__category-icon {
        width: 100px;
        height: 100px;
        margin-bottom: 15px;
        display: block;
        margin-left: auto;
        margin-right: auto;
        object-fit: contain;
        max-width: 100%;
        height: auto;
    }

    .page-c54dangnhap__category-title {
        font-size: 1.4em;
        font-weight: bold;
        color: var(--c54-secondary);
        word-wrap: break-word;
        overflow-wrap: break-word;
    }

    .page-c54dangnhap__faq-container {
        max-width: 900px;
        margin: 0 auto;
        padding: 0 20px;
    }

    .page-c54dangnhap__faq-item {
        background-color: #FFFFFF;
        border-radius: 10px;
        margin-bottom: 15px;
        box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
        overflow: hidden;
        box-sizing: border-box;
    }

    .page-c54dangnhap__faq-question {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 20px 25px;
        background-color: var(--c54-primary);
        color: var(--c54-text-light);
        cursor: pointer;
        user-select: none;
        transition: background-color 0.3s ease;
        box-sizing: border-box;
    }

    .page-c54dangnhap__faq-question:hover {
        background-color: #3F51B5;
    }

    .page-c54dangnhap__faq-question h3 {
        margin: 0;
        font-size: 1.2em;
        flex-grow: 1;
        pointer-events: none; /* Prevent h3 from blocking click event */
        word-wrap: break-word;
        overflow-wrap: break-word;
    }

    .page-c54dangnhap__faq-toggle {
        font-size: 1.8em;
        font-weight: bold;
        margin-left: 15px;
        pointer-events: none; /* Prevent toggle icon from blocking click event */
        color: var(--c54-secondary);
    }

    .page-c54dangnhap__faq-answer {
        max-height: 0;
        overflow: hidden;
        padding: 0 25px;
        transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.4s ease;
        opacity: 0;
        color: var(--c54-text-dark);
        background-color: #F9F9F9;
        box-sizing: border-box;
    }

    .page-c54dangnhap__faq-item.active .page-c54dangnhap__faq-answer {
        max-height: 2000px !important; /* Sufficiently large */
        padding: 20px 25px !important;
        opacity: 1;
    }

    .page-c54dangnhap__faq-answer p {
        margin: 0;
        font-size: 1em;
        word-wrap: break-word;
        overflow-wrap: break-word;
    }

    /* Floating Buttons */
    .page-c54dangnhap__floating-button {
        position: fixed;
        bottom: 20px;
        padding: 12px 25px;
        border-radius: 50px;
        font-weight: bold;
        font-size: 16px;
        cursor: pointer;
        z-index: 1000;
        box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
        transition: all 0.3s ease;
        border: none;
        text-align: center;
    }

    .page-c54dangnhap__floating-button--register {
        right: 20px;
        background-color: var(--c54-secondary); /* Gold */
        color: var(--c54-primary); /* Dark blue */
    }

    .page-c54dangnhap__floating-button--login {
        left: 20px;
        background-color: var(--c54-primary); /* Dark blue */
        color: var(--c54-text-light);
        border: 2px solid var(--c54-secondary);
    }

    .page-c54dangnhap__floating-button:hover {
        transform: translateY(-3px);
        box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
    }

    /* Responsive Design */
    @media (max-width: 1024px) {
        .page-c54dangnhap__hero-title {
            font-size: 2.8em;
        }
        .page-c54dangnhap__hero-subtitle {
            font-size: 1.2em;
        }
        .page-c54dangnhap__section-title {
            font-size: 2.2em;
        }
    }

    @media (max-width: 768px) {
        .page-c54dangnhap__hero-section {
            padding-bottom: 40px;
        }
        .page-c54dangnhap__hero-title {
            font-size: 2.2em;
            margin-bottom: 15px;
        }
        .page-c54dangnhap__hero-subtitle {
            font-size: 1em;
            margin-bottom: 25px;
        }
        .page-c54dangnhap__cta-button {
            padding: 12px 25px;
            font-size: 1em;
        }
        .page-c54dangnhap__section {
            padding: 40px 15px;
        }
        .page-c54dangnhap__section-title {
            font-size: 1.8em;
            margin-bottom: 30px;
        }
        .page-c54dangnhap__content-text {
            font-size: 1em;
            margin-bottom: 30px;
        }
        .page-c54dangnhap__card-grid {
            grid-template-columns: 1fr;
            gap: 20px;
        }
        .page-c54dangnhap__card {
            padding: 25px;
        }
        .page-c54dangnhap__card-title {
            font-size: 1.3em;
        }
        .page-c54dangnhap__step-item {
            flex-direction: column;
            text-align: center;
            padding: 20px;
        }
        .page-c54dangnhap__step-number {
            margin: 0 0 20px 0;
            width: 50px;
            height: 50px;
            font-size: 2em;
        }
        .page-c54dangnhap__step-title {
            font-size: 1.2em;
        }
        .page-c54dangnhap__troubleshooting-list {
            grid-template-columns: 1fr;
            gap: 15px;
        }
        .page-c54dangnhap__troubleshooting-item {
            padding: 15px;
        }
        .page-c54dangnhap__troubleshooting-title {
            font-size: 1.1em;
        }
        .page-c54dangnhap__game-categories {
            grid-template-columns: 1fr;
            gap: 20px;
        }
        .page-c54dangnhap__category-item {
            padding: 20px;
        }
        .page-c54dangnhap__category-icon {
            width: 80px;
            height: 80px;
        }
        .page-c54dangnhap__category-title {
            font-size: 1.2em;
        }
        .page-c54dangnhap__faq-question {
            padding: 15px 20px;
        }
        .page-c54dangnhap__faq-question h3 {
            font-size: 1.1em;
        }
        .page-c54dangnhap__faq-toggle {
            font-size: 1.5em;
            margin-left: 10px;
        }
        .page-c54dangnhap__faq-answer {
            padding: 0 20px;
        }
        .page-c54dangnhap__faq-item.active .page-c54dangnhap__faq-answer {
            padding: 15px 20px !important;
        }

        .page-c54dangnhap__floating-button {
            bottom: 15px;
            padding: 10px 20px;
            font-size: 14px;
        }
        .page-c54dangnhap__floating-button--register {
            right: 15px;
        }
        .page-c54dangnhap__floating-button--login {
            left: 15px;
        }

        /* Ensure all list items and containers are 100% width on mobile */
        .page-c54dangnhap__card,
        .page-c54dangnhap__step-item,
        .page-c54dangnhap__troubleshooting-item,
        .page-c54dangnhap__category-item,
        .page-c54dangnhap__faq-item {
            width: 100% !important;
            max-width: 100% !important;
            box-sizing: border-box !important;
            margin-left: 0 !important;
            margin-right: 0 !important;
            word-wrap: break-word !important;
            overflow-wrap: break-word !important;
        }
        .page-c54dangnhap__card-grid,
        .page-c54dangnhap__steps-container,
        .page-c54dangnhap__troubleshooting-list,
        .page-c54dangnhap__game-categories,
        .page-c54dangnhap__faq-container {
            width: 100% !important;
            max-width: 100% !important;
            padding: 0 !important;
            margin-left: 0 !important;
            margin-right: 0 !important;
            box-sizing: border-box !important;
        }

        /* Images responsive */
        .page-c54dangnhap__image,
        .page-c54dangnhap__card-icon,
        .page-c54dangnhap__category-icon {
            max-width: 100% !important;
            height: auto !important;
            box-sizing: border-box !important;
        }
        .page-c54dangnhap__image-container {
            width: 100% !important;
            max-width: 100% !important;
            overflow: hidden !important;
            box-sizing: border-box !important;
        }
    }