:root {
    --primary: #FF6B00;
    --primary-hover: #E65A00;
    --dark: #121213;
    --dark-grey: #1E1E1F;
    --light: #F4F4F6;
    --white: #FFFFFF;
    --text-main: #333333;
    --text-muted: #666666;
    --glass: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: var(--text-main);
    background-color: var(--white);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header */
header {
    background-color: rgba(18, 18, 19, 0.95);
    backdrop-filter: blur(10px);
    color: white;
    padding: 16px 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 24px;
    font-weight: 800;
    letter-spacing: -1px;
}

.logo span {
    color: var(--primary);
}

nav ul {
    display: flex;
    list-style: none;
    align-items: center;
}

nav ul li {
    margin-left: 32px;
}

nav ul li a {
    color: white;
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    transition: var(--transition);
}

nav ul li a:hover {
    color: var(--primary);
}

.btn-nav {
    background-color: var(--primary);
    padding: 10px 20px;
    border-radius: 8px;
}

/* Hero Section */
#hero {
    padding: 160px 0 100px;
    background: radial-gradient(circle at 100% 0%, #222224 0%, var(--dark) 100%);
    color: white;
    position: relative;
    overflow: hidden;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 60px;
    align-items: center;
}

.badge {
    display: inline-block;
    background-color: rgba(255, 107, 0, 0.15);
    color: var(--primary);
    padding: 6px 16px;
    border-radius: 99px;
    font-size: 14px;
    font-weight: 800;
    margin-bottom: 24px;
    border: 1px solid var(--primary);
}

h1 {
    font-size: 56px;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -2px;
}

.subtitle {
    font-size: 18px;
    color: #AAA;
    margin-bottom: 40px;
    max-width: 500px;
}

.cta-group {
    display: flex;
    gap: 16px;
    margin-bottom: 40px;
}

.btn-primary {
    background-color: var(--primary);
    color: white;
    padding: 16px 32px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 800;
    transition: var(--transition);
    display: inline-block;
    border: none;
    cursor: pointer;
    text-align: center;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(255, 107, 0, 0.4);
}

.btn-secondary {
    border: 1px solid #444;
    color: white;
    padding: 16px 32px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 800;
    transition: var(--transition);
}

.btn-secondary:hover {
    background-color: rgba(255,255,255,0.05);
}

.hero-image {
    position: relative;
}

.hero-image img {
    width: 100%;
    height: auto;
    filter: drop-shadow(0 20px 50px rgba(0,0,0,0.5));
}

.floating {
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
    100% { transform: translateY(0px); }
}

.experience-tag {
    position: absolute;
    bottom: 20px;
    right: 0;
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(10px);
    padding: 16px 24px;
    border-radius: 12px;
    border: 1px solid rgba(255,255,255,0.1);
}

.experience-tag strong {
    display: block;
    font-size: 24px;
    color: var(--primary);
}

/* Pain Points */
#pain-points {
    padding: 100px 0;
    background-color: var(--light);
}

.section-title {
    font-size: 40px;
    font-weight: 800;
    margin-bottom: 60px;
    letter-spacing: -1px;
    text-align: center;
}

.section-title.white { color: white; }

.pain-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.pain-card {
    background: white;
    padding: 32px;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    transition: var(--transition);
    overflow: hidden;
    text-align: center;
}

.pain-img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-radius: 12px;
    margin-bottom: 24px;
}

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

/* Comparison Section */
#comparison {
    padding: 100px 0;
    background: radial-gradient(circle at 50% 50%, #1a1a1c 0%, #121213 100%);
    color: white;
}

.comparison-box {
    padding: 60px;
    border-radius: 40px;
    text-align: center;
}

.comparison-header {
    margin-bottom: 60px;
}

.comparison-header p {
    color: #888;
    font-size: 18px;
}

.comparison-grid {
    display: grid;
    grid-template-columns: 1fr 80px 1fr;
    gap: 40px;
    align-items: center;
    margin-bottom: 60px;
}

.compare-card {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.05);
    padding: 40px;
    border-radius: 30px;
    text-align: left;
    transition: var(--transition);
}

.compare-card:hover {
    background: rgba(255, 255, 255, 0.04);
}

.compare-tag {
    display: inline-block;
    padding: 6px 16px;
    background: #444;
    color: #AAA;
    border-radius: 99px;
    font-size: 12px;
    font-weight: 800;
    margin-bottom: 24px;
}

.compare-tag.success {
    background: rgba(255, 107, 0, 0.15);
    color: var(--primary);
    border: 1px solid var(--primary);
}

.compare-image {
    width: 100%;
    height: 200px;
    border-radius: 20px;
    overflow: hidden;
    margin-bottom: 30px;
}

.compare-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.compare-list {
    list-style: none;
}

.compare-list li {
    margin-bottom: 16px;
    font-size: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.compare-vs {
    font-size: 40px;
    font-weight: 900;
    color: #333;
    font-style: italic;
}

.recent-order {
    position: fixed;
    bottom: 30px;
    left: 30px;
    background: white;
    padding: 12px 20px;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    display: flex;
    align-items: center;
    gap: 15px;
    z-index: 10000;
    transform: translateX(-150%);
    transition: transform 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.recent-order.show {
    transform: translateX(0);
}

.recent-order img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
}

.recent-order .info {
    font-size: 13px;
    line-height: 1.4;
}

.recent-order .info strong {
    color: var(--primary);
}

/* Features */
#features {
    padding: 100px 0;
}

.feature-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.feature-list {
    list-style: none;
    margin-top: 24px;
}

.feature-list li {
    margin-bottom: 12px;
    padding-left: 28px;
    position: relative;
}

.feature-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: 800;
}

.feature-display {
    background: #000;
    height: 450px;
    border-radius: 30px;
    position: relative;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}

.slides {
    width: 100%;
    height: 100%;
    position: relative;
}

.slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 0.8s ease-in-out;
    display: flex;
    justify-content: center;
    align-items: center;
}

.slide.active {
    opacity: 1;
}

.slide-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.5;
}

.slide-caption {
    position: absolute;
    bottom: 30px;
    left: 30px;
    background: var(--primary);
    color: white;
    padding: 8px 16px;
    border-radius: 4px;
    font-weight: 800;
    font-size: 14px;
    transform: translateY(20px);
    opacity: 0;
    transition: all 0.5s ease-out 0.3s;
}

.slide.active .slide-caption {
    transform: translateY(0);
    opacity: 1;
}

.dial-overlay {
    position: absolute;
    top: 40px;
    right: 40px;
    text-align: center;
    background: rgba(0,0,0,0.4);
    padding: 20px;
    border-radius: 20px;
    backdrop-filter: blur(5px);
    border: 1px solid rgba(255,255,255,0.1);
}

.power-dial {
    font-size: 64px;
    display: block;
    line-height: 1;
    font-weight: 800;
    color: var(--primary);
    text-shadow: 0 0 30px rgba(255, 107, 0, 0.5);
    transition: transform 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

/* Benefits */
.dark-section {
    padding: 100px 0;
    background-color: var(--dark);
    color: white;
}

.benefit-row {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 60px;
    align-items: center;
}

.benefit-image-box {
    border-radius: 30px;
    overflow: hidden;
    box-shadow: 20px 20px 60px rgba(0,0,0,0.5);
}

.benefit-main-img {
    width: 100%;
    height: auto;
    display: block;
}

.benefit-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
}

.benefit-item {
    position: relative;
    padding: 40px;
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.05);
    border-radius: 20px;
}

.count {
    font-size: 64px;
    font-weight: 800;
    color: rgba(255, 107, 0, 0.1);
    position: absolute;
    top: 10px;
    right: 20px;
}

.benefit-item h4 {
    font-size: 20px;
    margin-bottom: 16px;
    color: var(--primary);
}

/* Pricing */
#pricing {
    padding: 100px 0;
}

.price-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    margin-top: 40px;
    justify-items: center;
}

.price-card {
    background: white;
    padding: 50px 40px;
    border-radius: 24px;
    border: 1px solid #EEE;
    max-width: 380px;
    width: 100%;
    transition: var(--transition);
}

.price-card.featured {
    border: 2px solid var(--primary);
    position: relative;
    transform: scale(1.05);
    box-shadow: 0 20px 40px rgba(255, 107, 0, 0.1);
}

.hot-tag {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary);
    color: white;
    padding: 6px 16px;
    border-radius: 99px;
    font-size: 12px;
    font-weight: 800;
}

.price {
    font-size: 48px;
    font-weight: 800;
    margin: 24px 0 8px;
}

.price span { font-size: 24px; vertical-align: super; }

.old-price {
    text-decoration: line-through;
    color: #AAA;
    margin-bottom: 32px;
}

.price-card ul {
    list-style: none;
    text-align: left;
    margin-bottom: 40px;
}

.price-card ul li {
    margin-bottom: 12px;
    padding-left: 24px;
    position: relative;
}

.price-card ul li::before {
    content: "•";
    color: var(--primary);
    position: absolute;
    left: 0;
    font-weight: 800;
}

.btn-outline {
    display: block;
    padding: 14px;
    border: 1px solid #AAA;
    border-radius: 8px;
    text-decoration: none;
    color: var(--text-main);
    font-weight: 800;
    transition: var(--transition);
    text-align: center;
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
}

/* Contact Box */
#contact {
    padding: 100px 0;
    background: radial-gradient(circle at 0% 100%, #222, var(--dark));
}

.contact-box {
    max-width: 600px;
    margin: 0 auto;
    padding: 60px;
    border-radius: 30px;
    text-align: center;
    color: white;
}

.glass {
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.contact-form {
    margin-top: 40px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.contact-form input, .contact-form select {
    padding: 16px;
    border-radius: 8px;
    border: 1px solid rgba(255,255,255,0.1);
    background: rgba(255,255,255,0.05);
    color: white;
    font-family: inherit;
}

.selector-label {
    text-align: left;
    font-size: 14px;
    color: #AAA;
    margin: 10px 0;
}

.combo-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 24px;
}

.combo-option {
    position: relative;
    cursor: pointer;
}

.combo-option input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.option-content {
    background: rgba(255,255,255,0.03);
    border: 2px solid rgba(255,255,255,0.1);
    border-radius: 12px;
    padding: 20px 10px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    transition: var(--transition);
    height: 100%;
}

.combo-option input:checked + .option-content {
    border-color: var(--primary);
    background: rgba(255, 107, 0, 0.05);
    box-shadow: 0 0 20px rgba(255, 107, 0, 0.1);
}

.option-name {
    font-weight: 800;
    font-size: 12px;
    letter-spacing: 0.5px;
}

.option-details {
    font-size: 11px;
    color: #888;
}

.option-price {
    font-size: 18px;
    font-weight: 800;
    color: var(--primary);
    margin-top: 5px;
}

.badge-mini {
    background: var(--primary);
    color: white;
    font-size: 9px;
    font-weight: 800;
    padding: 2px 8px;
    border-radius: 4px;
    width: fit-content;
    margin: 0 auto 5px;
}

.combo-option.recommended {
    transform: scale(1.05);
}

@media (max-width: 500px) {
    .combo-options { grid-template-columns: 1fr; }
    .combo-option.recommended { transform: scale(1); }
}

.full-width { width: 100%; }

/* Video Showcase */
#video-showcase {
    padding: 100px 0;
    background-color: var(--white);
}

.video-container {
    max-width: 800px;
    margin: 40px auto 0;
    padding: 20px;
    border-radius: 30px;
    position: relative;
    overflow: hidden;
    background: rgba(18, 18, 19, 0.03);
    border: 1px solid rgba(18, 18, 19, 0.05);
}

.video-placeholder {
    width: 100%;
    aspect-ratio: 16/9;
    background: #000;
    border-radius: 20px;
    overflow: hidden;
    position: relative;
    cursor: pointer;
}

.video-thumb {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.7;
    transition: var(--transition);
}

.video-placeholder:hover .video-thumb {
    transform: scale(1.05);
    opacity: 0.8;
}

.play-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--primary);
    color: white;
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 0 30px rgba(255, 107, 0, 0.5);
    transition: var(--transition);
}

.video-placeholder:hover .play-btn {
    scale: 1.1;
}

.video-note {
    margin-top: 20px;
    color: var(--text-muted);
    font-size: 14px;
    font-style: italic;
}

/* Testimonials */
#testimonials {
    padding: 100px 0;
    background-color: var(--light);
}

.testimonial-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-top: 40px;
}

.testimonial-card {
    background: white;
    padding: 32px;
    border-radius: 24px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.03);
    border: 1px solid #F0F0F0;
    transition: var(--transition);
}

.testimonial-card.highlighted {
    border: 2px solid var(--primary);
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(255, 107, 0, 0.08);
}

.testimonial-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
}

.avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--primary);
}

.user-info h4 {
    font-size: 16px;
    font-weight: 800;
}

.user-info p {
    font-size: 13px;
    color: var(--text-muted);
}

.testimonial-text {
    font-size: 15px;
    line-height: 1.6;
    color: #444;
    font-style: italic;
    margin-bottom: 20px;
}

.stars {
    color: #FFD700;
    font-size: 14px;
}

/* Footer */
footer {
    padding: 80px 0 40px;
    background-color: #0c0c0d;
    color: #666;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr 1.2fr;
    gap: 60px;
    text-align: left;
    border-bottom: 1px solid #222;
    padding-bottom: 40px;
    margin-bottom: 20px;
}

.brand-desc {
    margin-top: 16px;
    font-size: 14px;
    line-height: 1.6;
}

.footer-info h4, .footer-policy h4 {
    color: white;
    font-size: 16px;
    font-weight: 800;
    margin-bottom: 24px;
    letter-spacing: 1px;
}

.footer-info p {
    margin-bottom: 12px;
    color: #888;
    font-size: 14px;
}

.footer-policy ul {
    list-style: none;
}

.footer-policy ul li {
    margin-bottom: 12px;
    color: #888;
    font-size: 14px;
}

.copyright { text-align: center; font-size: 14px; }

/* Floating Social Share */
.social-share-floating {
    position: fixed;
    right: 20px;
    bottom: 20px;
    display: flex;
    flex-direction: column;
    gap: 15px;
    z-index: 999;
}
.share-btn {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    color: white;
    box-shadow: 0 4px 15px rgba(0,0,0,0.25);
    transition: var(--transition);
    cursor: pointer;
    text-decoration: none;
    font-family: 'Inter', sans-serif;
}
.share-btn:hover {
    transform: scale(1.15) translateY(-5px);
    color: white;
}
.share-fb { background: #1877F2; }
.share-zalo { background: #0068FF; font-weight: 800; font-size: 14px; }

/* Responsive */
@media (max-width: 992px) {
    h1 { font-size: 36px; letter-spacing: -1px; }
    .hero-grid { grid-template-columns: 1fr; text-align: center; gap: 40px; }
    .hero-content { display: flex; flex-direction: column; align-items: center; }
    .hero-image { order: -1; margin-bottom: 20px; }
    
    .pain-grid, .price-cards { grid-template-columns: 1fr !important; gap: 32px !important; }
    .price-card { max-width: 100% !important; }
    .price-card.featured { transform: scale(1) !important; margin-top: 10px; }
    
    .feature-row { grid-template-columns: 1fr; text-align: center; gap: 40px; }
    .feature-display { height: 350px; }
    
    .benefit-row { grid-template-columns: 1fr; gap: 30px; }
    .benefit-image-box { order: -1; max-width: 100%; }
    
    .contact-box { padding: 40px 24px; }
    
    .testimonial-grid, .footer-grid { grid-template-columns: 1fr; gap: 32px; }
    .footer-info, .footer-brand, .footer-policy { text-align: center; }
    .footer-policy ul li { display: inline-block; margin: 5px 10px; }
    .testimonial-card.highlighted { transform: none; }
    .footer-grid { border: none; }
    
    .dial-overlay { 
        top: 20px; 
        right: 20px; 
        padding: 10px;
        scale: 0.8;
    }

    nav { flex-direction: column; gap: 20px; }
    nav ul { flex-wrap: wrap; justify-content: center; gap: 10px; }
    nav ul li { margin: 0 10px; }

    /* Comparison Mobile */
    .comparison-grid { grid-template-columns: 1fr; gap: 20px; }
    .compare-vs { margin: 10px 0; transform: rotate(90deg); display: inline-block; }
    .comparison-box { padding: 30px 20px; }
}

@media (max-width: 576px) {
    h1 { font-size: 32px; }
    .btn-primary, .btn-secondary { width: 100%; padding: 14px 20px; font-size: 14px; }
    .cta-group { flex-direction: column; width: 100%; }
    .experience-tag { display: none; }
    .benefit-item { padding: 24px; }
    .logo { font-size: 20px; }
}