:root {
    --primary-color: #113B7A;
    --secondary-color: #1D5FD1;
    --btn-gradient: linear-gradient(180deg, #2B73F6 0%, #1144A6 100%);
    --card-bg: #10233F;
    --text-main: #F3F8FF;
    --text-secondary: #AFC4E8;
    --border-color: #244D84;
    --glow-color: #4FA8FF;
    --gold-color: #F2C14E;
    --divider-color: #1B3357;
    --deep-navy: #08162B;
    --gold-color-rgb: 242, 193, 78;
    --primary-color-rgb: 17, 59, 122;
}

.page-khuyen-mai {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-main);
    background-color: var(--deep-navy);
}

.page-khuyen-mai__container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px 15px;
}

.page-khuyen-mai__section-title {
    font-size: 36px;
    font-weight: bold;
    color: var(--gold-color);
    text-align: center;
    margin-bottom: 40px;
    position: relative;
    padding-bottom: 15px;
}

.page-khuyen-mai__section-title::after {
    content: '';
    position: absolute;
    left: 50%;
    bottom: 0;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: var(--gold-color);
    border-radius: 2px;
}

.page-khuyen-mai__section-title--light {
    color: var(--gold-color);
}

.page-khuyen-mai__text-block {
    font-size: 18px;
    line-height: 1.8;
    text-align: center;
    max-width: 900px;
    margin: 0 auto 50px auto;
    color: var(--text-main);
}

.page-khuyen-mai__text-block--light {
    color: var(--text-main);
}

.page-khuyen-mai__btn-primary,
.page-khuyen-mai__btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 15px 30px;
    border-radius: 8px;
    font-size: 18px;
    font-weight: bold;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    max-width: 100%;
    box-sizing: border-box;
    white-space: normal;
    word-wrap: break-word;
}

.page-khuyen-mai__btn-primary {
    background: var(--btn-gradient);
    color: #ffffff;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.page-khuyen-mai__btn-primary:hover {
    opacity: 0.9;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

.page-khuyen-mai__btn-secondary {
    background: transparent;
    color: var(--gold-color);
    border: 2px solid var(--gold-color);
}

.page-khuyen-mai__btn-secondary:hover {
    background: rgba(var(--gold-color-rgb), 0.1);
    transform: translateY(-2px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.page-khuyen-mai__btn-small {
    padding: 10px 20px;
    font-size: 16px;
}

.page-khuyen-mai__btn-large {
    padding: 18px 35px;
    font-size: 20px;
}

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

.page-khuyen-mai__cta-wrapper {
    text-align: center;
    margin-top: 50px;
}

.page-khuyen-mai__card {
    background: var(--card-bg);
    border-radius: 10px;
    padding: 30px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
    color: var(--text-main);
}

.page-khuyen-mai img {
    max-width: 100%;
    height: auto;
    display: block;
    border-radius: 8px;
}

.page-khuyen-mai__hero-section {
    position: relative;
    padding-top: 10px;
    margin-bottom: 60px;
}

.page-khuyen-mai__hero-image-wrapper {
    position: relative;
    width: 100%;
    height: 600px;
    overflow: hidden;
    border-radius: 10px;
}

.page-khuyen-mai__hero-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.page-khuyen-mai__hero-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: #ffffff;
    z-index: 10;
    max-width: 900px;
    padding: 20px;
    background: rgba(0, 0, 0, 0.5);
    border-radius: 10px;
}

.page-khuyen-mai__main-title {
    font-size: clamp(32px, 4vw, 56px);
    color: var(--gold-color);
    margin-bottom: 20px;
    line-height: 1.2;
    font-weight: 700;
}

.page-khuyen-mai__description {
    font-size: clamp(16px, 1.5vw, 20px);
    margin-bottom: 30px;
    color: var(--text-secondary);
}

.page-khuyen-mai__overview-section {
    background-color: var(--deep-navy);
    padding: 60px 0;
}

.page-khuyen-mai__features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.page-khuyen-mai__feature-card {
    text-align: center;
}

.page-khuyen-mai__feature-icon {
    width: 100%;
    height: auto;
    max-width: 200px;
    margin: 0 auto 20px auto;
    object-fit: contain;
}

.page-khuyen-mai__feature-title {
    font-size: 24px;
    color: var(--gold-color);
    margin-bottom: 15px;
}

.page-khuyen-mai__feature-description {
    font-size: 16px;
    color: var(--text-secondary);
}

.page-khuyen-mai__promo-types-section {
    background-color: var(--primary-color);
    padding: 80px 0;
}

.page-khuyen-mai__promo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.page-khuyen-mai__promo-card {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.page-khuyen-mai__promo-image {
    width: 100%;
    height: 250px;
    object-fit: cover;
    margin-bottom: 20px;
}

.page-khuyen-mai__promo-title {
    font-size: 22px;
    color: var(--gold-color);
    margin-bottom: 15px;
    flex-grow: 1;
}

.page-khuyen-mai__promo-description {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 20px;
    flex-grow: 1;
}

.page-khuyen-mai__how-to-claim-section {
    background-color: var(--deep-navy);
    padding: 80px 0;
}

.page-khuyen-mai__steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.page-khuyen-mai__step-card {
    text-align: center;
    position: relative;
    padding-top: 60px;
}

.page-khuyen-mai__step-number {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gold-color);
    color: var(--deep-navy);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    font-weight: bold;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
}

.page-khuyen-mai__step-title {
    font-size: 22px;
    color: var(--gold-color);
    margin-bottom: 15px;
}

.page-khuyen-mai__step-description {
    font-size: 16px;
    color: var(--text-secondary);
}

.page-khuyen-mai__terms-section {
    background-color: var(--primary-color);
    padding: 80px 0;
}

.page-khuyen-mai__terms-list {
    list-style: none;
    padding: 0;
    max-width: 800px;
    margin: 30px auto;
    text-align: left;
}

.page-khuyen-mai__terms-list li {
    background: var(--card-bg);
    padding: 15px 20px;
    margin-bottom: 10px;
    border-radius: 8px;
    font-size: 17px;
    color: var(--text-secondary);
    border-left: 5px solid var(--gold-color);
}

.page-khuyen-mai__faq-section {
    background-color: var(--deep-navy);
    padding: 80px 0;
}

.page-khuyen-mai__faq-list {
    max-width: 900px;
    margin: 50px auto 0 auto;
}

details.page-khuyen-mai__faq-item {
    margin-bottom: 15px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    overflow: hidden;
    background: var(--card-bg);
    color: var(--text-main);
}
details.page-khuyen-mai__faq-item summary.page-khuyen-mai__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;
}
details.page-khuyen-mai__faq-item summary.page-khuyen-mai__faq-question::-webkit-details-marker {
    display: none;
}
details.page-khuyen-mai__faq-item summary.page-khuyen-mai__faq-question:hover {
    background: rgba(var(--gold-color-rgb), 0.1);
}
.page-khuyen-mai__faq-qtext {
    flex: 1;
    font-size: 18px;
    font-weight: 600;
    line-height: 1.5;
    text-align: left;
    color: var(--text-main);
}
.page-khuyen-mai__faq-toggle {
    font-size: 28px;
    font-weight: bold;
    color: var(--gold-color);
    flex-shrink: 0;
    margin-left: 15px;
    width: 32px;
    text-align: center;
}
details.page-khuyen-mai__faq-item .page-khuyen-mai__faq-answer {
    padding: 0 20px 20px;
    background: rgba(var(--primary-color-rgb), 0.5);
    border-radius: 0 0 10px 10px;
    color: var(--text-secondary);
    font-size: 16px;
}
details.page-khuyen-mai__faq-item .page-khuyen-mai__faq-answer p {
    margin-bottom: 0;
}

.page-khuyen-mai__final-cta-section {
    background-color: var(--primary-color);
    padding: 80px 0;
    text-align: center;
}

@media (max-width: 1024px) {
    .page-khuyen-mai__hero-image-wrapper {
        height: 500px;
    }
    .page-khuyen-mai__main-title {
        font-size: clamp(30px, 4.5vw, 50px);
    }
    .page-khuyen-mai__description {
        font-size: clamp(15px, 1.8vw, 18px);
    }
    .page-khuyen-mai__section-title {
        font-size: 32px;
    }
    .page-khuyen-mai__text-block {
        font-size: 17px;
    }
    .page-khuyen-mai__btn-primary,
    .page-khuyen-mai__btn-secondary {
        padding: 12px 25px;
        font-size: 16px;
    }
    .page-khuyen-mai__btn-large {
        padding: 15px 30px;
        font-size: 18px;
    }
    .page-khuyen-mai__feature-title,
    .page-khuyen-mai__promo-title,
    .page-khuyen-mai__step-title {
        font-size: 20px;
    }
    .page-khuyen-mai__faq-qtext {
        font-size: 17px;
    }
}

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

    .page-khuyen-mai__section-title {
        font-size: 28px;
        margin-bottom: 30px;
        padding-bottom: 10px;
    }
    .page-khuyen-mai__section-title::after {
        width: 60px;
        height: 3px;
    }

    .page-khuyen-mai__text-block {
        font-size: 16px;
        margin-bottom: 30px;
        padding: 0 10px;
    }

    /* HERO 主图区域 */
    .page-khuyen-mai__hero-section {
        padding-top: 10px; /* Small top padding */
        margin-bottom: 40px;
    }
    .page-khuyen-mai__hero-image-wrapper {
        height: 300px;
        border-radius: 5px;
    }
    .page-khuyen-mai__hero-image {
        object-fit: contain !important;
        aspect-ratio: unset !important;
    }
    .page-khuyen-mai__hero-content {
        position: relative;
        top: auto;
        left: auto;
        transform: none;
        padding: 15px;
        margin-top: 20px;
        background: transparent;
        max-width: 100%;
    }
    .page-khuyen-mai__main-title {
        font-size: clamp(28px, 8vw, 40px);
        margin-bottom: 15px;
        color: var(--gold-color);
    }
    .page-khuyen-mai__description {
        font-size: 15px;
        margin-bottom: 25px;
        color: var(--text-secondary);
    }

    /* 通用图片与容器 */
    .page-khuyen-mai img {
        max-width: 100% !important;
        width: 100% !important;
        height: auto !important;
        border-radius: 5px;
    }
    .page-khuyen-mai__overview-section,
    .page-khuyen-mai__promo-types-section,
    .page-khuyen-mai__how-to-claim-section,
    .page-khuyen-mai__terms-section,
    .page-khuyen-mai__faq-section,
    .page-khuyen-mai__final-cta-section {
        max-width: 100% !important;
        width: 100% !important;
        box-sizing: border-box !important;
        padding-left: 15px;
        padding-right: 15px;
    }

    /* 按钮与按钮容器 */
    .page-khuyen-mai__cta-buttons {
        flex-direction: column;
        gap: 15px;
        margin-top: 25px;
        padding-left: 15px;
        padding-right: 15px;
    }
    .page-khuyen-mai__btn-primary,
    .page-khuyen-mai__btn-secondary,
    .page-khuyen-mai a[class*="button"],
    .page-khuyen-mai 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 15px;
        font-size: 16px;
    }
    .page-khuyen-mai__btn-large {
        padding: 15px 20px;
        font-size: 18px;
    }
    .page-khuyen-mai__cta-wrapper {
        padding-left: 15px;
        padding-right: 15px;
    }

    /* 产品展示图区域 (features-grid, promo-grid, steps-grid) */
    .page-khuyen-mai__features-grid,
    .page-khuyen-mai__promo-grid,
    .page-khuyen-mai__steps-grid {
        grid-template-columns: 1fr;
        gap: 20px;
        margin-top: 30px;
    }

    /* Promo Card Specifics */
    .page-khuyen-mai__promo-image {
        height: 200px;
    }

    /* FAQ */
    details.page-khuyen-mai__faq-item summary.page-khuyen-mai__faq-question {
        padding: 15px;
    }
    .page-khuyen-mai__faq-qtext {
        font-size: 16px;
    }
    .page-khuyen-mai__faq-toggle {
        font-size: 24px;
        width: 28px;
    }
    details.page-khuyen-mai__faq-item .page-khuyen-mai__faq-answer {
        padding: 0 15px 15px;
        font-size: 15px;
    }

    /* Terms List */
    .page-khuyen-mai__terms-list li {
        font-size: 15px;
        padding: 12px 15px;
    }
}