:root {
    --primary-color: #007AFF; /* Tech Blue */
    --secondary-color: #00C896; /* Medical/Regen Green */
    --bg-color: #F5F7FA;
    --text-color: #333333;
    --light-text: #666666;
    --white: #FFFFFF;
    --card-shadow: 0 10px 30px rgba(0,0,0,0.05);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Noto Sans SC', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* Navigation */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: 1px;
}

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

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: var(--transition);
}

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

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: linear-gradient(135deg, #ffffff 0%, #f0f4ff 100%);
    position: relative;
    padding-top: 70px;
}

.hero-content h1 {
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: 20px;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1.2;
}

.subtitle {
    font-size: 1.5rem;
    color: var(--light-text);
    margin-bottom: 40px;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 50px;
    margin-bottom: 50px;
}

.stat-item {
    display: flex;
    flex-direction: column;
}

.stat-num {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-color);
}

.stat-desc {
    font-size: 0.9rem;
    color: var(--light-text);
}

.btn-primary {
    display: inline-block;
    padding: 15px 40px;
    background: var(--primary-color);
    color: var(--white);
    text-decoration: none;
    border-radius: 30px;
    font-weight: 600;
    transition: var(--transition);
    box-shadow: 0 5px 15px rgba(0, 122, 255, 0.3);
    border: none;
    cursor: pointer;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 122, 255, 0.4);
}

/* Sections General */
.section {
    padding: 100px 0;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.section-desc {
    text-align: center;
    color: var(--light-text);
    margin-bottom: 60px;
    font-size: 1.1rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Pain Cards (Flip Effect) */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.pain-card {
    background-color: transparent;
    height: 350px;
    perspective: 1000px;
    cursor: pointer;
}

.card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    text-align: center;
    transition: transform 0.6s;
    transform-style: preserve-3d;
    box-shadow: var(--card-shadow);
    border-radius: 20px;
}

.pain-card.flipped .card-inner {
    transform: rotateY(180deg);
}

.card-front, .card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    border-radius: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 30px;
    background: var(--white);
}

.card-front {
    border: 1px solid #eee;
}

.card-back {
    background: linear-gradient(135deg, var(--primary-color), #0056b3);
    color: var(--white);
    transform: rotateY(180deg);
}

.icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.pain-card h3 {
    margin-bottom: 15px;
    font-size: 1.5rem;
}

.hint {
    margin-top: 20px;
    font-size: 0.8rem;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    padding: 5px 15px;
    border-radius: 15px;
}

/* Technology Loop */
.tech-loop {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    margin-bottom: 60px;
}

.loop-step {
    background: var(--white);
    padding: 30px;
    border-radius: 15px;
    text-align: center;
    box-shadow: var(--card-shadow);
    flex: 1;
    min-width: 200px;
    margin: 10px;
    transition: var(--transition);
}

.loop-step:hover {
    transform: translateY(-5px);
}

.step-icon {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.loop-arrow {
    font-size: 2rem;
    color: var(--primary-color);
    font-weight: 300;
}

.tech-highlight {
    background: #E6F2FF;
    padding: 40px;
    border-radius: 20px;
    text-align: center;
    border-left: 5px solid var(--primary-color);
}

.tech-highlight h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
}

/* Profit Calculator */
.profit-section {
    background-color: var(--white);
}

.calculator-container {
    background: #F8F9FB;
    padding: 40px;
    border-radius: 20px;
    box-shadow: var(--card-shadow);
    max-width: 800px;
    margin: 0 auto;
}

.calc-inputs {
    margin-bottom: 30px;
}

.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    margin-bottom: 10px;
    font-weight: 500;
}

.input-group input {
    width: 100%;
    margin-bottom: 10px;
}

.input-value {
    font-weight: 700;
    color: var(--primary-color);
    float: right;
}

.calc-results {
    display: flex;
    justify-content: space-around;
    border-top: 1px solid #ddd;
    padding-top: 30px;
}

.result-item {
    text-align: center;
}

.result-item .label {
    display: block;
    color: var(--light-text);
    margin-bottom: 5px;
}

.result-item .value {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-color);
}

.result-item.highlight .value {
    color: var(--secondary-color);
}

.disclaimer {
    text-align: center;
    font-size: 0.8rem;
    color: #999;
    margin-top: 20px;
}

/* Offer Section */
.offer-section {
    background: linear-gradient(135deg, #1a1a1a 0%, #333333 100%);
    color: var(--white);
}

.offer-section .section-title, .offer-section .section-desc {
    color: var(--white);
}

.offer-card {
    background: var(--white);
    color: var(--text-color);
    max-width: 600px;
    margin: 0 auto;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 20px 50px rgba(0,0,0,0.3);
}

.offer-header {
    background: var(--primary-color);
    color: var(--white);
    padding: 40px;
    text-align: center;
}

.offer-header h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
}

.price {
    font-size: 3.5rem;
    font-weight: 700;
}

.price .unit {
    font-size: 1.5rem;
}

.offer-body {
    padding: 40px;
}

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

.benefit-list li {
    margin-bottom: 15px;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.offer-footer {
    padding: 0 40px 40px;
    text-align: center;
}

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

/* Footer */
.footer {
    background: #111;
    color: #666;
    padding: 50px 0;
    text-align: center;
}

.footer-logo {
    color: var(--white);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 10px;
}

/* Animations */
.fade-in-up {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s forwards;
}

.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }
.delay-3 { animation-delay: 0.6s; }

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.scroll-reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

.scroll-reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive */
@media (max-width: 768px) {
    .hero-content h1 {
        font-size: 2.5rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 20px;
    }
    
    .loop-arrow {
        transform: rotate(90deg);
        margin: 10px 0;
        width: 100%;
        text-align: center;
    }
    
    .calc-results {
        flex-direction: column;
        gap: 20px;
    }
}