/* ===== CSS Variables ===== */
:root {
    --primary: #00a67d;
    --primary-dark: #008c6a;
    --primary-light: #4ecba8;
    --secondary: #1a365d;
    --secondary-light: #2d4a7c;
    --accent: #00d4a0;
    --text-dark: #1a202c;
    --text-medium: #4a5568;
    --text-light: #718096;
    --bg-light: #f7fafc;
    --bg-white: #ffffff;
    --border: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 50px rgba(0,0,0,0.15);
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-full: 9999px;
    --transition: all 0.3s ease;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-dark);
    background: var(--bg-white);
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

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

ul {
    list-style: none;
}

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

/* ===== Typography ===== */
h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-dark);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.25rem, 2vw, 1.5rem); }
h4 { font-size: 1.125rem; }

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    border: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

.btn-primary {
    background: var(--primary);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

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

.btn-lg {
    padding: 16px 36px;
    font-size: 1rem;
}

.btn-nav {
    padding: 10px 24px;
    background: var(--primary);
    color: white !important;
}

.btn-nav:hover {
    background: var(--primary-dark);
    color: white !important;
}

/* ===== Navigation ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    padding: 16px 0;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 800;
}

.logo-pure {
    color: var(--secondary);
}

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

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-medium);
}

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

.nav-links a.btn-nav {
    color: white !important;
}

.nav-links a.btn-nav:hover {
    color: white !important;
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-dark);
    border-radius: 2px;
    transition: var(--transition);
}

/* ===== Hero Section ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding: 120px 0 80px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    right: 0;
    width: 60%;
    height: 100%;
    background: linear-gradient(135deg, var(--bg-light) 0%, rgba(0, 166, 125, 0.05) 100%);
    clip-path: polygon(20% 0, 100% 0, 100% 100%, 0% 100%);
    z-index: -1;
}

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

.hero-text {
    max-width: 600px;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 24px;
}

.badge-icon {
    width: 18px;
    height: 18px;
    background: white;
    color: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
}

.hero h1 {
    margin-bottom: 24px;
}

.highlight {
    color: var(--primary);
    position: relative;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--text-medium);
    margin-bottom: 32px;
    line-height: 1.7;
}

.hero-features {
    display: flex;
    flex-wrap: wrap;
    gap: 24px;
    margin-bottom: 40px;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
    color: var(--text-dark);
}

.feature-icon {
    width: 20px;
    height: 20px;
    color: var(--primary);
}

.hero-cta {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.product-showcase {
    position: relative;
}

.product-img {
    max-height: 500px;
    width: auto;
    filter: drop-shadow(0 30px 60px rgba(0, 166, 125, 0.3));
    animation: float 6s ease-in-out infinite;
}

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

.product-glow {
    position: absolute;
    bottom: -20%;
    left: 50%;
    transform: translateX(-50%);
    width: 80%;
    height: 40%;
    background: radial-gradient(ellipse, rgba(0, 166, 125, 0.2) 0%, transparent 70%);
    filter: blur(20px);
}

.hero-scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-light);
    font-size: 0.875rem;
}

.scroll-indicator {
    width: 24px;
    height: 40px;
    border: 2px solid var(--border);
    border-radius: 12px;
    position: relative;
}

.scroll-indicator::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--primary);
    border-radius: 2px;
    animation: scroll 2s ease-in-out infinite;
}

@keyframes scroll {
    0%, 100% { opacity: 1; top: 8px; }
    50% { opacity: 0.5; top: 20px; }
}

/* ===== Section Styles ===== */
section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 60px;
}

.section-tag {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(0, 166, 125, 0.1);
    color: var(--primary);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.section-header p {
    color: var(--text-medium);
    font-size: 1.125rem;
    margin-top: 16px;
}

/* ===== Problem Section ===== */
.problem-section {
    background: var(--bg-light);
}

.problem-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 60px;
}

.problem-card {
    background: white;
    padding: 32px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.problem-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.problem-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.problem-icon svg {
    width: 28px;
    height: 28px;
    color: white;
}

.problem-card h3 {
    margin-bottom: 12px;
}

.problem-card p {
    color: var(--text-medium);
    font-size: 0.95rem;
}

.anatomy-visual {
    text-align: center;
}

.anatomy-img {
    max-width: 700px;
    margin: 0 auto;
    border-radius: var(--radius-lg);
}

.anatomy-caption {
    margin-top: 24px;
}

.anatomy-caption p {
    color: var(--text-medium);
    font-style: italic;
}

/* ===== Solution Section ===== */
.solution-section {
    background: var(--secondary);
    color: white;
}

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

.solution-text .section-tag {
    background: rgba(255, 255, 255, 0.1);
    color: var(--accent);
}

.solution-text h2 {
    color: white;
    margin-bottom: 20px;
}

.solution-text > p {
    color: rgba(255, 255, 255, 0.8);
    font-size: 1.1rem;
    margin-bottom: 40px;
}

.solution-benefits {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.benefit-item {
    display: flex;
    gap: 20px;
}

.benefit-number {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--accent) 0%, var(--primary) 100%);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.1rem;
}

.benefit-content h4 {
    color: white;
    margin-bottom: 6px;
}

.benefit-content p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.95rem;
}

.solution-image {
    display: flex;
    justify-content: center;
}

.device-img {
    max-height: 450px;
    filter: drop-shadow(0 30px 60px rgba(0, 0, 0, 0.4));
}

/* ===== How It Works Section ===== */
.how-section {
    background: white;
}

.steps-container {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: 0;
    margin-bottom: 80px;
}

.step {
    flex: 1;
    max-width: 300px;
    text-align: center;
    padding: 0 20px;
}

.step-number {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto 24px;
    box-shadow: var(--shadow-lg);
}

.step-content h3 {
    margin-bottom: 12px;
}

.step-content p {
    color: var(--text-medium);
    font-size: 0.95rem;
}

.step-connector {
    flex-shrink: 0;
    width: 80px;
    height: 2px;
    background: linear-gradient(90deg, var(--primary) 0%, var(--primary-light) 100%);
    margin-top: 32px;
}

.comparison-section {
    margin-top: 40px;
}

.comparison-section h3 {
    text-align: center;
    margin-bottom: 32px;
}

.comparison-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    max-width: 900px;
    margin: 0 auto;
}

.comparison-card {
    padding: 32px;
    border-radius: var(--radius-lg);
}

.comparison-card.before {
    background: #fef2f2;
    border: 2px solid #fecaca;
}

.comparison-card.after {
    background: #f0fdf4;
    border: 2px solid #bbf7d0;
}

.comparison-header {
    margin-bottom: 20px;
}

.comparison-label {
    font-weight: 600;
    font-size: 1rem;
}

.before .comparison-label {
    color: #dc2626;
}

.after .comparison-label {
    color: var(--primary);
}

.comparison-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.comparison-list li {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.95rem;
    color: var(--text-medium);
}

.comparison-list li::before {
    content: '';
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}

.before .comparison-list li::before {
    background: #dc2626;
}

.after .comparison-list li::before {
    background: var(--primary);
}

/* ===== Specifications Section ===== */
.specs-section {
    background: var(--bg-light);
}

.specs-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 60px;
}

.spec-card {
    background: white;
    padding: 24px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    gap: 16px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.spec-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.spec-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, rgba(0, 166, 125, 0.1) 0%, rgba(0, 166, 125, 0.2) 100%);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.spec-icon svg {
    width: 24px;
    height: 24px;
    color: var(--primary);
}

.spec-details {
    display: flex;
    flex-direction: column;
}

.spec-label {
    font-size: 0.8rem;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.spec-value {
    font-weight: 600;
    color: var(--text-dark);
}

.certifications {
    display: flex;
    justify-content: center;
    gap: 60px;
}

.cert-item {
    display: flex;
    align-items: center;
    gap: 16px;
}

.cert-badge {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.9rem;
}

.cert-badge.fda {
    background: linear-gradient(135deg, #1e40af 0%, #1e3a8a 100%);
    color: white;
}

.cert-badge.patent {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
}

.cert-item p {
    color: var(--text-medium);
    font-size: 0.95rem;
}

/* ===== Research Section ===== */
.research-section {
    background: white;
}

.research-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    margin-bottom: 60px;
}

.research-card {
    background: var(--bg-light);
    padding: 32px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    transition: var(--transition);
}

.research-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
}

.research-journal {
    font-size: 0.875rem;
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 12px;
}

.research-card h4 {
    margin-bottom: 12px;
    line-height: 1.4;
}

.research-card p {
    color: var(--text-medium);
    font-size: 0.95rem;
    margin-bottom: 16px;
}

.research-link {
    color: var(--primary);
    font-weight: 600;
    font-size: 0.95rem;
}

.research-link:hover {
    color: var(--primary-dark);
}

.stats-banner {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    background: linear-gradient(135deg, var(--secondary) 0%, var(--secondary-light) 100%);
    padding: 48px;
    border-radius: var(--radius-lg);
}

.stat {
    text-align: center;
    color: white;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 0.95rem;
    opacity: 0.8;
}

/* ===== Contact Section ===== */
.contact-section {
    background: var(--bg-light);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: start;
}

.contact-info .section-tag {
    margin-bottom: 16px;
}

.contact-info h2 {
    margin-bottom: 16px;
}

.contact-info > p {
    color: var(--text-medium);
    font-size: 1.1rem;
    margin-bottom: 32px;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 32px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 12px;
}

.contact-item svg {
    width: 24px;
    height: 24px;
    color: var(--primary);
}

.contact-item a {
    color: var(--text-dark);
    font-weight: 500;
}

.contact-item a:hover {
    color: var(--primary);
}

.social-links {
    display: flex;
    gap: 12px;
}

.social-link {
    width: 44px;
    height: 44px;
    background: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.social-link svg {
    width: 20px;
    height: 20px;
    color: var(--text-medium);
}

.social-link:hover {
    background: var(--primary);
    transform: translateY(-3px);
}

.social-link:hover svg {
    color: white;
}

.social-link.whatsapp {
    background: #25D366;
}

.social-link.whatsapp svg {
    color: white;
}

.social-link.whatsapp:hover {
    background: #128C7E;
}

.whatsapp-icon {
    color: #25D366;
}

.contact-form-container {
    background: white;
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.contact-form {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group.full-width {
    grid-column: 1 / -1;
}

.form-group label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-dark);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 14px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
    background: var(--bg-light);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    background: white;
    box-shadow: 0 0 0 3px rgba(0, 166, 125, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* ===== Footer ===== */
.footer {
    background: var(--secondary);
    color: white;
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-brand .logo {
    margin-bottom: 16px;
    display: inline-block;
}

.footer-brand .logo-pure {
    color: white;
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.95rem;
}

.footer-legal {
    margin-top: 8px;
    font-size: 0.875rem !important;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.footer-col h4 {
    color: white;
    margin-bottom: 20px;
    font-size: 1rem;
}

.footer-col ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-col a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.95rem;
}

.footer-col a:hover {
    color: var(--accent);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 30px;
    text-align: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.875rem;
}

.disclaimer {
    margin-top: 8px;
    font-style: italic;
}

/* ===== Responsive Design ===== */
@media (max-width: 1024px) {
    .problem-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

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

@media (max-width: 768px) {
    .mobile-toggle {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 20px;
        gap: 16px;
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }

    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

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

    .hero-text {
        max-width: 100%;
    }

    .hero-features {
        justify-content: center;
    }

    .hero-cta {
        justify-content: center;
    }

    .hero-image {
        order: -1;
    }

    .product-img {
        max-height: 300px;
    }

    .hero-bg {
        width: 100%;
        clip-path: none;
    }

    .hero-scroll {
        display: none;
    }

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

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

    .solution-image {
        order: -1;
    }

    .device-img {
        max-height: 300px;
    }

    .steps-container {
        flex-direction: column;
        gap: 24px;
    }

    .step {
        max-width: 100%;
    }

    .step-connector {
        width: 2px;
        height: 40px;
        margin: 0 auto;
    }

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

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

    .certifications {
        flex-direction: column;
        align-items: center;
        gap: 24px;
    }

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

    .stats-banner {
        grid-template-columns: 1fr;
        padding: 32px;
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .contact-form {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

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

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    section {
        padding: 60px 0;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.75rem;
    }

    .hero {
        padding: 100px 0 60px;
    }

    .btn-lg {
        padding: 14px 28px;
        font-size: 0.95rem;
    }

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

    .stats-banner {
        gap: 24px;
    }

    .stat-number {
        font-size: 2rem;
    }
}