* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Montserrat', 'Inter', sans-serif;
}

body {
    background-color: #f8f9fa;
    color: #333;
    line-height: 1.6;
}

/* Biến màu sắc */
:root {
    --primary-red: #a81c1c; /* Đỏ mận/Đỏ sâm */
    --dark-red: #8b0000;
    --text-dark: #333;
    --text-light: #fff;
    --bg-dark: #111;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 5%;
    background: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.logo img {
    height: 80px;
    object-fit: contain;
    transform: scale(1.8);
    transform-origin: left center;
    mix-blend-mode: multiply; /* Làm trong suốt viền trắng thừa của ảnh */
}

.slogan {
    color: var(--primary-red);
    font-weight: 700;
    font-size: 1.4rem;
    font-style: italic;
    text-transform: uppercase;
    letter-spacing: 1px;
    text-align: center;
    flex: 1;
}

.contact-info {
    font-weight: bold;
    color: var(--primary-red);
}

.phone-number {
    color: var(--primary-red);
    font-weight: bold;
    font-size: 1.2rem;
    text-decoration: none;
}

nav {
    background-color: var(--primary-red);
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
}

nav ul li {
    padding: 15px 30px;
}

nav ul li a {
    color: var(--text-light);
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    text-transform: uppercase;
    transition: color 0.3s;
}

nav ul li a:hover {
    color: #ffd700;
}

/* Hero Section */
.hero {
    background-color: #ffffff;
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 80px 5%;
    gap: 40px;
}

.hero-content {
    flex: 1;
    max-width: 600px;
}

.hero-image {
    flex: 1;
    text-align: right;
}

.hero-image img {
    max-width: 100%;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.hero-subtitle {
    color: var(--primary-red);
    font-weight: 700;
    font-size: 1.2rem;
    margin-bottom: 10px;
    letter-spacing: 2px;
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-desc {
    font-size: 1.2rem;
    margin-bottom: 30px;
    color: #555;
}

.cta-button {
    display: inline-block;
    background-color: var(--primary-red);
    color: var(--text-light);
    padding: 15px 40px;
    font-size: 1.2rem;
    font-weight: bold;
    text-decoration: none;
    border-radius: 5px;
    transition: background 0.3s, transform 0.3s;
    box-shadow: 0 4px 15px rgba(168, 28, 28, 0.4);
}

.cta-button:hover {
    background-color: var(--dark-red);
    transform: translateY(-3px);
}

/* Vấn đề (Pain Points) */
.pain-points {
    padding: 80px 5%;
    text-align: center;
    background-color: #fff;
}

.section-title {
    font-size: 2.5rem;
    color: var(--primary-red);
    margin-bottom: 40px;
}

.pain-grid {
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
}

.pain-card {
    background: #f9f9f9;
    padding: 30px;
    border-radius: 10px;
    width: 300px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    border-top: 4px solid var(--primary-red);
}

.pain-card h3 {
    margin-bottom: 15px;
    color: var(--text-dark);
}

/* Giải pháp - Khu vực Đen */
.solution {
    background-color: var(--bg-dark);
    color: var(--text-light);
    padding: 80px 5%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 50px;
}

.solution-content {
    flex: 1;
}

.solution-content h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: #fff;
}

.solution-content p {
    font-size: 1.1rem;
    margin-bottom: 20px;
    color: #ddd;
}

.solution-content ul {
    list-style: none;
    margin-bottom: 30px;
}

.solution-content ul li {
    font-size: 1.2rem;
    margin-bottom: 10px;
    padding-left: 30px;
    position: relative;
}

.solution-content ul li::before {
    content: '✓';
    color: var(--primary-red);
    font-weight: bold;
    position: absolute;
    left: 0;
}

.solution-image {
    flex: 1;
    text-align: center;
}

.solution-image img {
    max-width: 100%;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(255,255,255,0.1);
}

/* Sản phẩm */
.products {
    padding: 80px 5%;
    text-align: center;
}

.product-grid {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
    margin-top: 40px;
}

.product-card {
    background: #fff;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    width: 350px;
    transition: transform 0.3s;
    display: flex;
    flex-direction: column;
}

.product-card:hover {
    transform: translateY(-10px);
}

.product-card img {
    width: 100%;
    height: 300px;
    object-fit: cover;
}

.product-info {
    padding: 20px;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.product-info .cta-button {
    margin-top: auto;
    align-self: center;
}

.product-info h3 {
    color: var(--primary-red);
    font-size: 1.5rem;
    margin-bottom: 10px;
}

/* Feedback khách hàng */
.feedbacks {
    padding: 80px 5%;
    text-align: center;
    background-color: #f4f6f8;
}

.feedback-grid {
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
    margin-top: 40px;
}

.feedback-card {
    background: #fff;
    padding: 15px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    width: 350px;
    transition: transform 0.3s;
}

.feedback-card:hover {
    transform: scale(1.03);
}

.feedback-card img {
    width: 100%;
    border-radius: 5px;
    object-fit: cover;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

/* Ưu đãi & CTA */
.promo-cta {
    background: linear-gradient(135deg, var(--primary-red), var(--dark-red));
    color: #fff;
    text-align: center;
    padding: 80px 5%;
}

.promo-box {
    background: rgba(255,255,255,0.1);
    border: 2px dashed #ffd700;
    border-radius: 10px;
    padding: 30px;
    max-width: 700px;
    margin: 0 auto 30px;
}

.promo-box h3 {
    color: #ffd700;
    font-size: 2rem;
    margin-bottom: 10px;
}

/* Form Đặt Hàng */
.order-section {
    padding: 80px 5%;
    background-color: #f8f9fa;
}

.form-container {
    max-width: 500px;
    margin: 0 auto;
    background: #fff;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    border-top: 5px solid var(--primary-red);
}

.form-container input,
.form-container select {
    width: 100%;
    padding: 15px;
    margin-bottom: 20px;
    border: 1px solid #ccc;
    border-radius: 5px;
    font-size: 1rem;
    font-family: inherit;
}

.form-container input:focus,
.form-container select:focus {
    outline: none;
    border-color: var(--primary-red);
    box-shadow: 0 0 5px rgba(168, 28, 28, 0.3);
}

.submit-btn {
    width: 100%;
    background-color: var(--primary-red);
    color: #fff;
    padding: 15px;
    font-size: 1.2rem;
    font-weight: bold;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background 0.3s;
    text-transform: uppercase;
}

.submit-btn:hover {
    background-color: var(--dark-red);
}

/* Giấy Chứng Nhận */
.certificates {
    padding: 80px 5%;
    text-align: center;
    background-color: #fff;
}

.cert-grid {
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
}

.cert-card {
    background: #fff;
    padding: 10px;
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    width: 250px;
    transition: transform 0.3s;
}

.cert-card:hover {
    transform: scale(1.05);
}

.cert-card img {
    width: 100%;
    border-radius: 5px;
    object-fit: contain;
}

/* Floating Contact Buttons */
.floating-contact {
    position: fixed;
    bottom: 20px;
    right: 20px;
    display: flex;
    flex-direction: column;
    gap: 15px;
    z-index: 9999;
}

.contact-btn {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
    transition: transform 0.3s;
    animation: pulse 2s infinite;
}

.contact-btn img {
    width: 40px;
    height: 40px;
    object-fit: contain;
}

.zalo-btn {
    background-color: #0068ff;
}

.mess-btn {
    background-color: #ffffff;
}

.contact-btn:hover {
    transform: scale(1.1);
}

@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(0, 104, 255, 0.7);
    }
    70% {
        box-shadow: 0 0 0 15px rgba(0, 104, 255, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(0, 104, 255, 0);
    }
}

/* Payment Modal */
.payment-modal {
    position: fixed;
    z-index: 10000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.3s;
}

.modal-content {
    background-color: #fefefe;
    margin: 10% auto;
    padding: 30px;
    border-radius: 15px;
    width: 90%;
    max-width: 500px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    animation: slideIn 0.3s;
}

.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    transition: color 0.3s;
}

.close:hover,
.close:focus {
    color: var(--primary-red);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* Footer */
footer {
    background-color: #fff;
    padding: 50px 5% 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 30px;
    margin-bottom: 30px;
}

.footer-col {
    flex: 1;
    min-width: 250px;
}

.footer-col h4 {
    color: var(--primary-red);
    font-size: 1.2rem;
    margin-bottom: 20px;
    text-transform: uppercase;
}

.footer-col p {
    margin-bottom: 10px;
    color: #555;
}

.footer-bottom {
    background-color: var(--primary-red);
    color: #fff;
    text-align: center;
    padding: 15px;
    margin: 0 -5.5%;
}

/* Responsive */
@media (max-width: 768px) {
    .header {
        flex-direction: column;
        gap: 15px;
        padding-top: 20px;
    }
    .slogan {
        display: none;
    }
    .logo img {
        height: 60px;
        transform: scale(1.5);
    }
    .hero {
        flex-direction: column;
        text-align: center;
        padding-top: 40px;
    }
    .hero-image {
        text-align: center;
        margin-top: 30px;
    }
    .solution {
        flex-direction: column;
    }
    .hero-title {
        font-size: 2rem;
    }
    nav ul {
        flex-direction: column;
        align-items: center;
    }
    nav ul li {
        padding: 10px;
    }
}