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

:root {
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --dark-text: #1a1a1a;
    --light-text: #666666;
    --border-color: #e0e0e0;
    --spacing-sm: 10px;
    --spacing-md: 20px;
    --spacing-lg: 30px;
    --font-size-sm: 12px;
    --font-size-base: 14px;
    --font-size-lg: 16px;
    --font-size-xl: 24px;
    --font-size-2xl: 32px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--dark-text);
    line-height: 1.6;
    background: white;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* NAVIGATION */
nav {
    background: white;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 15px 0;
}

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

.logo {
    font-size: var(--font-size-xl);
    font-weight: 600;
    letter-spacing: 1px;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 30px;
}

.nav-links a {
    text-decoration: none;
    color: var(--dark-text);
    font-size: var(--font-size-base);
    transition: color 0.3s;
}

.nav-links a:hover {
    color: var(--primary-color);
}

/* HERO SECTION */
.hero {
    padding: 60px 0;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
}

.hero-text h1 {
    font-size: var(--font-size-2xl);
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
    color: var(--dark-text);
}

.hero-text > p {
    font-size: var(--font-size-base);
    color: var(--light-text);
    margin-bottom: var(--spacing-lg);
}

.trust-badge {
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.trust-badge h3 {
    font-size: var(--font-size-lg);
    margin-bottom: 10px;
}

.trust-badge p {
    font-size: var(--font-size-sm);
    color: var(--light-text);
    margin-bottom: 10px;
}

.trust-badge a {
    color: var(--primary-color);
    text-decoration: none;
}

.stripe-guarantee {
    background: #f0f9ff;
    color: var(--primary-color);
    padding: 10px;
    border-radius: 4px;
    font-weight: 600;
    font-size: var(--font-size-sm);
    margin-top: 10px;
}

.cta-button {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 15px 40px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    font-size: var(--font-size-base);
    transition: transform 0.3s, box-shadow 0.3s;
    border: none;
    cursor: pointer;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.3);
}

.hero-image img {
    width: 100%;
    height: auto;
    border-radius: 12px;
}

/* FEATURES SECTION */
.features {
    padding: 80px 0;
    background: white;
}

.features h2 {
    font-size: var(--font-size-2xl);
    text-align: center;
    margin-bottom: 50px;
}

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

.feature-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 30px;
    transition: box-shadow 0.3s, transform 0.3s;
}

.feature-card:hover {
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transform: translateY(-5px);
}

.feature-card h3 {
    font-size: var(--font-size-lg);
    margin-bottom: 10px;
    color: var(--dark-text);
}

.feature-card p {
    font-size: var(--font-size-base);
    color: var(--light-text);
}

/* SPECS SECTION */
.specs {
    padding: 80px 0;
    background: #f9f9f9;
}

.specs h2 {
    font-size: var(--font-size-2xl);
    text-align: center;
    margin-bottom: 50px;
}

.specs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.spec-item {
    background: white;
    border-radius: 8px;
    padding: 20px;
    text-align: center;
    border: 1px solid var(--border-color);
}

.spec-item h3 {
    font-size: var(--font-size-base);
    color: var(--light-text);
    margin-bottom: 10px;
}

.spec-item .value {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--primary-color);
}

/* VIDEO SECTION */
.video-section {
    padding: 80px 0;
    background: white;
}

.video-section h2 {
    font-size: var(--font-size-2xl);
    text-align: center;
    margin-bottom: 50px;
}

.video-container {
    max-width: 800px;
    margin: 0 auto;
}

.video-placeholder {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    border-radius: 8px;
}

.video-placeholder iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

/* SOCIAL PROOF SECTION */
.social-proof {
    padding: 80px 0;
    background: #f9f9f9;
}

.social-proof h2 {
    font-size: var(--font-size-2xl);
    text-align: center;
    margin-bottom: 50px;
}

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

.testimonial {
    background: white;
    border-left: 4px solid var(--primary-color);
    padding: 30px;
    border-radius: 4px;
}

.testimonial p {
    font-size: var(--font-size-base);
    color: var(--dark-text);
    margin-bottom: 15px;
    font-style: italic;
}

.testimonial .author {
    font-size: var(--font-size-sm);
    color: var(--light-text);
    font-weight: 600;
}

/* VIETNAM PARTNERSHIP SECTION */
.vietnam-partnership {
    padding: 80px 0;
    background: white;
}

.vietnam-partnership h2 {
    font-size: var(--font-size-2xl);
    margin-bottom: 50px;
}

.partnership-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
}

.partnership-text h3 {
    font-size: var(--font-size-xl);
    margin-bottom: 20px;
}

.partnership-text p {
    font-size: var(--font-size-base);
    color: var(--light-text);
    margin-bottom: 15px;
    line-height: 1.8;
}

.partnership-image img {
    width: 100%;
    height: auto;
    border-radius: 8px;
}

/* ROADMAP SECTION */
.roadmap {
    padding: 80px 0;
    background: #f9f9f9;
}

.roadmap h2 {
    font-size: var(--font-size-2xl);
    text-align: center;
    margin-bottom: 50px;
}

.timeline {
    max-width: 800px;
    margin: 0 auto;
}

.timeline-item {
    display: flex;
    gap: 30px;
    margin-bottom: 30px;
    position: relative;
}

.timeline-dot {
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 50%;
    margin-top: 5px;
    flex-shrink: 0;
}

.timeline-item:not(:last-child)::before {
    content: '';
    position: absolute;
    left: 9px;
    top: 20px;
    width: 2px;
    height: 100px;
    background: var(--border-color);
}

.timeline-content h3 {
    font-size: var(--font-size-lg);
    margin-bottom: 5px;
}

.timeline-content p {
    font-size: var(--font-size-base);
    color: var(--light-text);
}

/* FOUNDER SECTION */
.about-founder {
    padding: 80px 0;
    background: white;
}

.about-founder h2 {
    font-size: var(--font-size-2xl);
    margin-bottom: 50px;
}

.founder-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
}

.founder-image img {
    width: 100%;
    height: auto;
    border-radius: 8px;
}

.founder-text h3 {
    font-size: var(--font-size-xl);
    margin-bottom: 20px;
}

.founder-text p {
    font-size: var(--font-size-base);
    color: var(--light-text);
    margin-bottom: 15px;
    line-height: 1.8;
}

.escape-confidential-link {
    display: inline-block;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    margin-top: 15px;
    transition: color 0.3s;
}

.escape-confidential-link:hover {
    color: var(--secondary-color);
}

/* PAYMENT SECTION */
.payment-section {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
}

.payment-section h2 {
    font-size: var(--font-size-2xl);
    text-align: center;
    margin-bottom: 50px;
    color: white;
}

.payment-container {
    max-width: 600px;
    margin: 0 auto;
}

.price-display {
    text-align: center;
    margin-bottom: 40px;
    background: rgba(255, 255, 255, 0.1);
    padding: 30px;
    border-radius: 8px;
}

.price-display h3 {
    font-size: var(--font-size-base);
    margin-bottom: 10px;
    opacity: 0.9;
}

.price-display .amount {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 20px;
}

.currency-toggle {
    display: flex;
    gap: 10px;
    justify-content: center;
}

.currency-toggle button {
    padding: 10px 20px;
    border: 2px solid white;
    background: transparent;
    color: white;
    border-radius: 4px;
    cursor: pointer;
    font-size: var(--font-size-base);
    transition: all 0.3s;
}

.currency-toggle button.active {
    background: white;
    color: var(--primary-color);
}

.preorder-form-wrapper {
    background: white;
    color: var(--dark-text);
    padding: 30px;
    border-radius: 8px;
}

.currency-selector {
    margin-bottom: 30px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.currency-selector label {
    font-weight: 600;
    color: var(--dark-text);
    white-space: nowrap;
}

.currency-selector select {
    flex: 1;
    padding: 10px 12px;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    font-size: var(--font-size-base);
    cursor: pointer;
}

#payment-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

#card-element {
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    background: white;
}

#card-errors {
    color: #fa755a;
    font-size: var(--font-size-sm);
    min-height: 20px;
}

#submit-btn {
    padding: 14px 20px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: var(--font-size-lg);
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

#submit-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.4);
}

#submit-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.success-message {
    background: #f0f9ff;
    border: 2px solid #10b981;
    border-radius: 8px;
    padding: 30px;
    color: #065f46;
    text-align: center;
}

.success-message h2 {
    font-size: var(--font-size-xl);
    margin-bottom: 12px;
    color: #10b981;
}

.success-message p {
    margin: 8px 0;
    font-size: var(--font-size-base);
}

/* FOOTER */
footer {
    background: var(--dark-text);
    color: white;
    padding: 60px 0 20px;
}

footer .container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

footer h4 {
    font-size: var(--font-size-lg);
    margin-bottom: 15px;
}

footer ul {
    list-style: none;
}

footer ul li {
    margin-bottom: 10px;
}

footer a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color 0.3s;
}

footer a:hover {
    color: white;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 20px;
    text-align: center;
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.5);
}

/* MODALS */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.modal:not(.hidden) {
    display: flex;
}

.modal.hidden {
    display: none;
}

.modal-content {
    background: white;
    max-width: 600px;
    padding: 40px;
    border-radius: 8px;
    position: relative;
    max-height: 80vh;
    overflow-y: auto;
}

.modal-close {
    position: absolute;
    top: 20px;
    right: 20px;
    font-size: 28px;
    cursor: pointer;
    color: var(--light-text);
}

.modal-close:hover {
    color: var(--dark-text);
}

.modal-content h2 {
    font-size: var(--font-size-xl);
    margin-bottom: 20px;
}

.modal-content p {
    font-size: var(--font-size-base);
    color: var(--light-text);
    margin-bottom: 15px;
}

/* RESPONSIVE */
@media (max-width: 768px) {
    .nav-links {
        gap: 15px;
        font-size: var(--font-size-sm);
    }

    .hero .container,
    .partnership-content,
    .founder-content {
        grid-template-columns: 1fr;
    }

    .hero-text h1 {
        font-size: var(--font-size-xl);
    }

    .features-grid,
    .testimonials {
        grid-template-columns: 1fr;
    }

    .specs-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}