:root {
    --primary-color: #0CAA4F;
    --text-color: #000000;
    --bg-color: #ffffff;
    --bg-secondary: #f4f4f4;
    --white: #ffffff;
    --gray-text: #666666;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --radius: 8px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    overflow-x: hidden;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    text-decoration: none;
    color: inherit;
}

.container {
    width: 90%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 15px;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 15px 30px;
    border-radius: var(--radius);
    font-weight: 700;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    text-transform: uppercase;
    font-size: 1rem;
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--white);
    box-shadow: 0 4px 15px rgba(12, 170, 79, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(12, 170, 79, 0.6);
    background-color: #0a8f42;
}

.btn-large {
    font-size: 1.2rem;
    width: 100%;
    padding: 20px;
}

/* Typography */
h1, h2, h3 {
    line-height: 1.2;
    margin-bottom: 1rem;
    font-weight: 900;
}

h1 {
    font-size: 2rem;
}

h2 {
    font-size: 1.75rem;
    text-align: center;
}

.section-title {
    margin-bottom: 2rem;
    position: relative;
    padding-bottom: 10px;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background-color: var(--primary-color);
    margin: 10px auto 0;
    border-radius: 2px;
}

/* Hero Section */
.hero {
    padding: 60px 0;
    text-align: center;
    background: linear-gradient(to bottom, #ffffff, #f9f9f9);
}

.hero h1 {
    color: #111;
    margin-bottom: 20px;
}

.subheadline {
    font-size: 1.1rem;
    color: var(--gray-text);
    margin-bottom: 30px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

/* Benefits Section */
.benefits {
    padding: 60px 0;
    background-color: var(--bg-secondary);
}

.benefits-grid {
    display: grid;
    gap: 30px;
}

.benefit-item {
    background: var(--white);
    padding: 30px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
}

.benefit-item:hover {
    transform: translateY(-5px);
}

.benefit-item .icon {
    font-size: 3rem;
    margin-bottom: 15px;
    display: inline-block;
}

/* Social Proof */
.social-proof {
    padding: 60px 0;
}

.testimonials-grid {
    display: grid;
    gap: 20px;
}

.testimonial-card {
    background: var(--bg-secondary);
    padding: 20px;
    border-radius: var(--radius);
    border-left: 4px solid var(--primary-color);
}

.user-info {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
}

.avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    margin-right: 15px;
    background-size: cover;
    background-position: center;
}

.stars {
    color: #FFD700;
    font-size: 0.9rem;
}

/* Authority */
.authority {
    padding: 60px 0;
    background-color: #111;
    color: var(--white);
}

.authority-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 30px;
}

.instructor-photo {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    border: 5px solid var(--primary-color);
    background-size: cover;
    background-position: center;
}

.authority h2 {
    color: var(--white);
}

/* Offer Section */
.offer {
    padding: 80px 0;
    text-align: center;
    background: linear-gradient(135deg, #f4f4f4 0%, #ffffff 100%);
}

.offer-box {
    background: var(--white);
    padding: 40px 20px;
    border-radius: var(--radius);
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    border: 2px solid var(--primary-color);
    max-width: 600px;
    margin: 0 auto;
}

.timer-container {
    background: #000;
    color: #fff;
    display: inline-block;
    padding: 10px 20px;
    border-radius: 50px;
    margin-bottom: 20px;
    font-weight: bold;
}

#timer {
    font-size: 1.5rem;
    font-family: monospace;
}

.price {
    margin: 30px 0;
}

.old-price {
    display: block;
    text-decoration: line-through;
    color: var(--gray-text);
    font-size: 1.2rem;
}

.new-price {
    display: block;
    font-size: 2rem;
    font-weight: 900;
    color: var(--primary-color);
}

.guarantee {
    margin-top: 20px;
    font-size: 0.9rem;
    color: var(--gray-text);
    display: flex;
    align-items: center;
    justify-content: center;
}

/* FAQ */
.faq {
    padding: 60px 0;
    background-color: var(--bg-secondary);
}

details {
    background: var(--white);
    margin-bottom: 15px;
    border-radius: var(--radius);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    overflow: hidden;
}

summary {
    padding: 20px;
    cursor: pointer;
    font-weight: 600;
    list-style: none;
    position: relative;
}

summary::-webkit-details-marker {
    display: none;
}

summary::after {
    content: '+';
    position: absolute;
    right: 20px;
    font-size: 1.5rem;
    color: var(--primary-color);
    transition: transform 0.3s;
}

details[open] summary::after {
    transform: rotate(45deg);
}

details p {
    padding: 0 20px 20px;
    color: var(--gray-text);
    border-top: 1px solid #eee;
    margin-top: 10px;
}

/* Footer */
footer {
    background: #000;
    color: #888;
    text-align: center;
    padding: 40px 0 80px; /* Extra padding for floating btn */
}

footer a {
    color: var(--white);
    text-decoration: underline;
}

/* Floating CTA */
.floating-cta {
    position: fixed;
    bottom: 20px;
    left: 20px;
    right: 20px;
    z-index: 1000;
    box-shadow: 0 5px 20px rgba(0,0,0,0.3);
    border-radius: var(--radius);
    display: none; /* Hidden by default, shown via JS or media query */
}

.floating-cta .btn {
    width: 100%;
    border-radius: var(--radius);
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive */
@media (min-width: 768px) {
    h1 { font-size: 3rem; }
    .benefits-grid { grid-template-columns: repeat(2, 1fr); }
    .testimonials-grid { grid-template-columns: repeat(3, 1fr); }
    .authority-content { flex-direction: row; text-align: left; }
    .btn-large { width: auto; min-width: 300px; }
    footer { padding-bottom: 40px; }
    
    /* Hide floating CTA on desktop if preferred, or keep it */
    .mobile-only { display: none; }
}

@media (min-width: 1024px) {
    .benefits-grid { grid-template-columns: repeat(3, 1fr); }
    .container { width: 80%; }
}