/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #10B981;
    --primary-dark: #059669;
    --primary-light: #D1FAE5;
    --secondary-color: #6366F1;
    --accent-color: #F59E0B;
    --text-dark: #1F2937;
    --text-gray: #6B7280;
    --text-light: #9CA3AF;
    --bg-white: #FFFFFF;
    --bg-light: #F9FAFB;
    --bg-gray: #F3F4F6;
    --border-color: #E5E7EB;
    --danger: #EF4444;
    --warning: #F59E0B;
    --success: #10B981;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    color: var(--text-dark);
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* Navigation */
.navbar {
    background: var(--bg-white);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 1rem 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.logo i {
    font-size: 1.8rem;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s;
}

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

.cta-button {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.cta-button:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #ECFDF5 0%, #D1FAE5 50%, #E0E7FF 100%);
    padding: 6rem 0;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(124, 58, 237, 0.1) 0%, transparent 70%);
    border-radius: 50%;
    animation: float 8s ease-in-out infinite;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -5%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(16, 185, 129, 0.15) 0%, transparent 70%);
    border-radius: 50%;
    animation: float 10s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-30px);
    }
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: linear-gradient(135deg, #F3E8FF 0%, #E9D5FF 100%);
    border-radius: 20px;
    margin-bottom: 1.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: #7C3AED;
}

.hero-badge i {
    font-size: 1rem;
    color: #7C3AED;
}

.hero-text h1 {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
    background: linear-gradient(135deg, #059669 0%, #10B981 50%, #34D399 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-gray);
    margin-bottom: 2rem;
}

.hero-features {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

.hero-feature {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 500;
}

.hero-feature i {
    color: var(--primary-color);
    font-size: 1.25rem;
}

.primary-button {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 1rem 2.5rem;
    border-radius: 12px;
    font-size: 1.125rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.primary-button:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(16, 185, 129, 0.4);
}

.hero-note {
    margin-top: 1rem;
    font-size: 0.875rem;
    color: var(--text-gray);
}

/* AI Assistant Preview */
.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.ai-assistant-preview {
    background: white;
    border-radius: 24px;
    padding: 2.5rem;
    box-shadow: 0 20px 60px rgba(16, 185, 129, 0.15);
    width: 100%;
    max-width: 450px;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

.ai-avatar {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.avatar-circle {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: linear-gradient(135deg, #10B981 0%, #059669 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 10px 30px rgba(16, 185, 129, 0.3);
    position: relative;
    z-index: 2;
}

.avatar-circle i {
    font-size: 3.5rem;
    color: white;
}

.ai-pulse {
    position: absolute;
    width: 120px;
    height: 120px;
    border-radius: 50%;
    border: 3px solid var(--primary-color);
    opacity: 0.5;
    animation: pulse-ring 2s infinite;
}

@keyframes pulse-ring {
    0% {
        transform: scale(1);
        opacity: 0.5;
    }
    50% {
        transform: scale(1.3);
        opacity: 0;
    }
    100% {
        transform: scale(1);
        opacity: 0;
    }
}

.ai-chat-container {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.chat-messages {
    max-height: 200px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding-right: 0.5rem;
}

.chat-messages::-webkit-scrollbar {
    width: 4px;
}

.chat-messages::-webkit-scrollbar-track {
    background: var(--bg-light);
    border-radius: 4px;
}

.chat-messages::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

.message-bubble {
    padding: 0.875rem 1.25rem;
    border-radius: 16px;
    max-width: 85%;
    word-wrap: break-word;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.ai-bubble {
    background: linear-gradient(135deg, #F3F4F6 0%, #E5E7EB 100%);
    border-top-left-radius: 4px;
    align-self: flex-start;
}

.user-bubble {
    background: linear-gradient(135deg, #10B981 0%, #059669 100%);
    border-top-right-radius: 4px;
    align-self: flex-end;
}

.user-bubble p {
    color: white !important;
}

.message-bubble p {
    margin: 0;
    color: var(--text-dark);
    font-weight: 500;
    font-size: 0.9375rem;
    line-height: 1.5;
}

.chat-input-container {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.chat-input-container input {
    flex: 1;
    padding: 0.875rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-size: 0.9375rem;
    transition: all 0.3s;
}

.chat-input-container input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

.send-button {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: var(--primary-color);
    border: none;
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s;
    flex-shrink: 0;
}

.send-button:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.send-button:active {
    transform: translateY(0);
}

.send-button:disabled {
    background: var(--text-light);
    cursor: not-allowed;
    transform: none;
}

.chat-hint {
    font-size: 0.75rem;
    color: var(--text-gray);
    text-align: center;
    margin: 0;
}

.typing-indicator {
    display: flex;
    gap: 0.375rem;
    padding-left: 1rem;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--primary-color);
    animation: typing 1.4s infinite;
}

.typing-indicator span:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-indicator span:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typing {
    0%, 60%, 100% {
        transform: translateY(0);
        opacity: 0.5;
    }
    30% {
        transform: translateY(-10px);
        opacity: 1;
    }
}

.health-cards {
    display: flex;
    gap: 0.75rem;
    width: 100%;
}

.health-card {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 0.75rem;
    border-radius: 12px;
    transition: all 0.3s;
    cursor: pointer;
}

.health-card.prediction {
    background: linear-gradient(135deg, #DBEAFE 0%, #BFDBFE 100%);
}

.health-card.wearable {
    background: linear-gradient(135deg, #D1FAE5 0%, #A7F3D0 100%);
}

.health-card.report {
    background: linear-gradient(135deg, #FEE2E2 0%, #FECACA 100%);
}

.health-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
}

.health-card i {
    font-size: 1.75rem;
}

.health-card.prediction i {
    color: #3B82F6;
}

.health-card.wearable i {
    color: #10B981;
}

.health-card.report i {
    color: #EF4444;
}

.health-card span {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-dark);
    text-align: center;
}

.ai-features-list {
    display: flex;
    gap: 0.75rem;
    width: 100%;
    justify-content: center;
}

.feature-tag {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--bg-light);
    border-radius: 20px;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--text-gray);
    transition: all 0.3s;
}

.feature-tag:hover {
    background: var(--primary-light);
    color: var(--primary-color);
}

.feature-tag i {
    font-size: 0.875rem;
    color: var(--primary-color);
}

/* Problem Section */
.problem-section {
    padding: 5rem 0;
    background: var(--bg-white);
}

.problem-content {
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.problem-content h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.problem-content > p {
    font-size: 1.25rem;
    color: var(--text-gray);
    margin-bottom: 3rem;
}

.problem-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 3rem;
    margin-top: 3rem;
}

.stat h3 {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat p {
    color: var(--text-gray);
}

/* Features Section */
.features-section {
    padding: 5rem 0;
    background: var(--bg-light);
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.section-header p {
    font-size: 1.125rem;
    color: var(--text-gray);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 16px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    transition: all 0.3s;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    background: var(--primary-light);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.feature-icon i {
    font-size: 1.75rem;
    color: var(--primary-color);
}

.feature-card h3 {
    font-size: 1.375rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.feature-card > p {
    color: var(--text-gray);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

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

.feature-list li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
    color: var(--text-gray);
    font-size: 0.9375rem;
}

.feature-list i {
    color: var(--primary-color);
    font-size: 0.875rem;
}

/* How It Works */
.how-it-works {
    padding: 5rem 0;
    background: white;
}

.steps-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
    margin-top: 3rem;
}

.step {
    flex: 1;
    text-align: center;
}

.step-number {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--primary-color);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: 700;
    margin: 0 auto 1.5rem;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.step-content h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.step-content p {
    color: var(--text-gray);
    line-height: 1.7;
}

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

/* Benefits Section */
.benefits-section {
    padding: 5rem 0;
    background: var(--bg-light);
}

.benefits-section h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--text-dark);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.benefit {
    text-align: center;
}

.benefit i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.benefit h3 {
    font-size: 1.125rem;
    margin-bottom: 0.75rem;
    color: var(--text-dark);
}

.benefit p {
    color: var(--text-gray);
    font-size: 0.9375rem;
}

/* Register Section */
.register-section {
    padding: 5rem 0;
    background: linear-gradient(135deg, #ECFDF5 0%, #D1FAE5 100%);
}

.register-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.register-info h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.register-info > p {
    font-size: 1.125rem;
    color: var(--text-gray);
    margin-bottom: 2rem;
}

.register-benefits {
    list-style: none;
    margin-bottom: 3rem;
}

.register-benefits li {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
    font-size: 1.0625rem;
    color: var(--text-dark);
}

.register-benefits i {
    color: var(--accent-color);
    font-size: 1.25rem;
}

.trust-indicators {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.trust-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem;
    background: white;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.trust-item i {
    color: var(--primary-color);
    font-size: 1.5rem;
}

/* Register Form */
.register-form-container {
    background: white;
    padding: 2.5rem;
    border-radius: 16px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.register-form h3 {
    font-size: 1.75rem;
    margin-bottom: 2rem;
    color: var(--text-dark);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-dark);
}

.form-group input {
    width: 100%;
    padding: 0.875rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.radio-group {
    display: flex;
    gap: 1rem;
}

.radio-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    transition: all 0.3s;
}

.radio-label:hover {
    border-color: var(--primary-color);
    background: var(--primary-light);
}

.radio-label input[type="radio"] {
    width: auto;
    margin: 0;
}

.radio-label input[type="radio"]:checked + span {
    color: var(--primary-color);
    font-weight: 600;
}

.submit-button {
    width: 100%;
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 1rem;
    border-radius: 8px;
    font-size: 1.125rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.submit-button:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.form-note {
    text-align: center;
    margin-top: 1rem;
    font-size: 0.875rem;
    color: var(--text-gray);
}

.success-message {
    display: none;
    text-align: center;
    padding: 2rem;
}

.success-message.show {
    display: block;
}

.success-message i {
    font-size: 4rem;
    color: var(--success);
    margin-bottom: 1rem;
}

.success-message h3 {
    font-size: 1.75rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.success-message p {
    color: var(--text-gray);
}

/* FAQ Section */
.faq-section {
    padding: 5rem 0;
    background: white;
}

.faq-section h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--text-dark);
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.faq-item {
    padding: 2rem;
    background: var(--bg-light);
    border-radius: 12px;
    border-left: 4px solid var(--primary-color);
}

.faq-item h3 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.125rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.faq-item h3 i {
    color: var(--primary-color);
}

.faq-item p {
    color: var(--text-gray);
    line-height: 1.7;
}

/* Footer */
.footer {
    background: var(--text-dark);
    color: white;
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

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

.footer-section p {
    color: var(--text-light);
    margin-bottom: 1.5rem;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-links a {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-decoration: none;
    transition: all 0.3s;
}

.social-links a:hover {
    background: var(--primary-color);
    transform: translateY(-2px);
}

.footer-section h4 {
    margin-bottom: 1.5rem;
    font-size: 1.125rem;
}

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

.footer-section ul li {
    margin-bottom: 0.75rem;
}

.footer-section ul a {
    color: var(--text-light);
    text-decoration: none;
    transition: color 0.3s;
}

.footer-section ul a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 2rem;
    text-align: center;
    color: var(--text-light);
}

.footer-bottom p {
    margin-bottom: 0.5rem;
}

.disclaimer {
    font-size: 0.875rem;
    color: var(--text-light);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .hero-content {
        grid-template-columns: 1fr;
    }

    .hero-text h1 {
        font-size: 2.5rem;
    }

    .ai-assistant-preview {
        max-width: 100%;
        margin: 0 auto;
    }
    
    .health-cards {
        flex-direction: column;
    }
    
    .avatar-circle {
        width: 100px;
        height: 100px;
    }
    
    .avatar-circle i {
        font-size: 3rem;
    }
    
    .ai-pulse {
        width: 100px;
        height: 100px;
    }

    .problem-stats {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

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

    .steps-container {
        flex-direction: column;
    }

    .step-arrow {
        transform: rotate(90deg);
    }

    .benefits-grid {
        grid-template-columns: 1fr;
    }

    .register-content {
        grid-template-columns: 1fr;
    }

    .faq-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 1024px) and (min-width: 769px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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