:root {
    --color-primary: #113B7A;
    --color-secondary: #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;
}

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

.page-khuyen-mai__hero-section {
    position: relative;
    padding-top: 10px;
    margin-bottom: 40px;
    text-align: center;
    overflow: hidden;
}

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

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

.page-khuyen-mai__hero-content {
    max-width: 900px;
    margin: 0 auto;
    padding: 30px 20px;
    position: relative;
    z-index: 2;
    background: rgba(0, 0, 0, 0.5);
    border-radius: 10px;
    margin-top: -150px;
}

.page-khuyen-mai__hero-title {
    font-size: clamp(2.5rem, 4vw, 3.5rem);
    color: var(--gold-color);
    margin-bottom: 15px;
    font-weight: 700;
    line-height: 1.2;
}

.page-khuyen-mai__hero-description {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 30px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.page-khuyen-mai__hero-cta .page-khuyen-mai__btn-primary {
    display: inline-block;
    padding: 15px 30px;
    background: var(--btn-gradient);
    color: var(--text-main);
    text-decoration: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 700;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

.page-khuyen-mai__hero-cta .page-khuyen-mai__btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.4);
}

.page-khuyen-mai__intro-section,
.page-khuyen-mai__how-to-claim,
.page-khuyen-mai__faq-section,
.page-khuyen-mai__final-cta-section {
    padding: 60px 0;
    margin-bottom: 40px;
}

.page-khuyen-mai__promotions-grid,
.page-khuyen-mai__terms-section {
    padding: 60px 0;
    margin-bottom: 40px;
}

.page-khuyen-mai__dark-section {
    background-color: var(--color-primary);
    color: var(--text-main);
}

.page-khuyen-mai__light-bg {
    background-color: #f8f8f8;
    color: #333333;
}

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

.page-khuyen-mai__section-title {
    font-size: clamp(2rem, 3.5vw, 2.8rem);
    color: var(--gold-color);
    text-align: center;
    margin-bottom: 20px;
    font-weight: 700;
}

.page-khuyen-mai__light-bg .page-khuyen-mai__section-title {
    color: var(--color-primary);
}

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

.page-khuyen-mai__light-bg .page-khuyen-mai__section-description {
    color: #555555;
}

.page-khuyen-mai__text-main {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
    text-align: justify;
}

.page-khuyen-mai__light-bg .page-khuyen-mai__text-main {
    color: #444444;
}

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

.page-khuyen-mai__card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    color: var(--text-main);
}

.page-khuyen-mai__card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

.page-khuyen-mai__card img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    display: block;
}

.page-khuyen-mai__card-title {
    font-size: 1.5rem;
    color: var(--gold-color);
    padding: 20px 20px 10px;
    font-weight: 600;
}

.page-khuyen-mai__card-text {
    font-size: 0.95rem;
    color: var(--text-secondary);
    padding: 0 20px 20px;
    flex-grow: 1;
    text-align: justify;
}

.page-khuyen-mai__card .page-khuyen-mai__btn-secondary {
    display: block;
    width: calc(100% - 40px);
    margin: 0 20px 20px;
    padding: 12px 20px;
    background: transparent;
    border: 2px solid var(--gold-color);
    color: var(--gold-color);
    text-align: center;
    text-decoration: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.page-khuyen-mai__card .page-khuyen-mai__btn-secondary:hover {
    background-color: var(--gold-color);
    color: var(--color-primary);
}

.page-khuyen-mai__steps-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    counter-reset: step-counter;
}

.page-khuyen-mai__steps-list .page-khuyen-mai__list-item {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 30px;
    text-align: center;
    position: relative;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
}