/* ===================================
   CSS Variables & Reset
   =================================== */
:root {
    /* Colors - Medical/Clinical Palette */
    --primary-blue: #0066cc;
    --primary-blue-dark: #004d99;
    --primary-blue-light: #3385d6;
    --secondary-teal: #00a3a3;
    --accent-purple: #6366f1;

    /* Neutrals */
    --white: #ffffff;
    --off-white: #f8f9fa;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;

    /* Functional Colors */
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Playfair Display', Georgia, serif;

    /* Spacing */
    --section-padding: 120px;
    --container-max-width: 1200px;

    /* Transitions */
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    color: var(--gray-800);
    line-height: 1.7;
    background-color: var(--white);
    overflow-x: hidden;
}

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

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

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
}

/* ===================================
   Utility Classes
   =================================== */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-teal) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section {
    padding: var(--section-padding) 0;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-title {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: 1.25rem;
    color: var(--gray-600);
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.8;
}

/* ===================================
   Navigation
   =================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--gray-200);
    z-index: 1000;
    transition: var(--transition-smooth);
}

.navbar.scrolled {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--primary-blue);
}

.logo-icon {
    width: 36px;
    height: 36px;
}

.logo-text {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 40px;
    align-items: center;
}

.nav-links a {
    font-weight: 500;
    color: var(--gray-700);
    position: relative;
}

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

.nav-links a:not(.btn-secondary)::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-blue);
    transition: width 0.3s ease;
}

.nav-links a:not(.btn-secondary):hover::after {
    width: 100%;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 2px;
    background: var(--gray-700);
    transition: var(--transition-smooth);
}

/* ===================================
   Buttons
   =================================== */
.btn-primary,
.btn-secondary,
.btn-outline {
    padding: 14px 32px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition-smooth);
    display: inline-block;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-dark) 100%);
    color: var(--white);
    box-shadow: 0 4px 15px rgba(0, 102, 204, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(0, 102, 204, 0.4);
}

.btn-secondary {
    background: var(--gray-900);
    color: var(--white);
}

.btn-secondary:hover {
    background: var(--gray-800);
}

.btn-outline {
    background: transparent;
    color: var(--gray-700);
    border: 2px solid var(--gray-300);
}

.btn-outline:hover {
    border-color: var(--primary-blue);
    color: var(--primary-blue);
}

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

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, #f0f7ff 0%, #e6f2ff 50%, #f5f9ff 100%);
    z-index: -1;
}

.hero-background::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 1000px;
    height: 1000px;
    background: radial-gradient(circle, rgba(0, 102, 204, 0.08) 0%, transparent 70%);
    border-radius: 50%;
}

.hero-background::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(0, 163, 163, 0.06) 0%, transparent 70%);
    border-radius: 50%;
}

.hero-content {
    max-width: 900px;
    text-align: center;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-family: var(--font-display);
    font-size: 4.5rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 24px;
    color: var(--gray-900);
    letter-spacing: -0.03em;
}

.hero-subtitle {
    font-size: 1.375rem;
    color: var(--gray-600);
    margin-bottom: 40px;
    line-height: 1.7;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-cta {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-bottom: 60px;
}

.trust-badges {
    display: flex;
    gap: 40px;
    justify-content: center;
    flex-wrap: wrap;
}

.badge {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--gray-600);
    font-size: 0.95rem;
    font-weight: 500;
}

.badge svg {
    color: var(--primary-blue);
}

/* ===================================
   How It Works Section
   =================================== */
.how-it-works {
    background: var(--white);
}

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

.step {
    position: relative;
    padding: 40px 30px;
    background: var(--gray-50);
    border-radius: 16px;
    border: 2px solid transparent;
    transition: var(--transition-smooth);
}

.step:hover {
    border-color: var(--primary-blue);
    transform: translateY(-5px);
    box-shadow: 0 12px 40px rgba(0, 102, 204, 0.1);
}

.step-number {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-teal) 100%);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 24px;
    font-family: var(--font-display);
}

.step-content h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 12px;
}

.step-content p {
    color: var(--gray-600);
    line-height: 1.7;
}

/* ===================================
   Mission Section
   =================================== */
.mission {
    background: linear-gradient(180deg, var(--white) 0%, var(--gray-50) 100%);
}

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

.mission-content {
    max-width: 550px;
}

.mission-text {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--gray-700);
    margin-bottom: 24px;
}

.mission-values {
    display: grid;
    gap: 24px;
    margin-top: 40px;
}

.value {
    padding: 24px;
    background: var(--white);
    border-left: 4px solid var(--primary-blue);
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.value h4 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 8px;
}

.value p {
    color: var(--gray-600);
    line-height: 1.6;
}

.mission-visual {
    display: flex;
    justify-content: center;
}

.visual-card {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-teal) 100%);
    padding: 60px 50px;
    border-radius: 24px;
    box-shadow: 0 20px 60px rgba(0, 102, 204, 0.3);
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.stat-number {
    font-family: var(--font-display);
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--white);
    line-height: 1;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.9);
    font-weight: 500;
}

/* ===================================
   Science Section
   =================================== */
.science {
    background: var(--white);
}

.science-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.science-card {
    padding: 40px 32px;
    background: var(--gray-50);
    border-radius: 16px;
    border: 2px solid var(--gray-200);
    transition: var(--transition-smooth);
}

.science-card:hover {
    border-color: var(--secondary-teal);
    box-shadow: 0 12px 40px rgba(0, 163, 163, 0.15);
    transform: translateY(-5px);
}

.science-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--secondary-teal) 0%, var(--primary-blue) 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
}

.science-icon svg {
    color: var(--white);
}

.science-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 16px;
}

.science-card p {
    color: var(--gray-600);
    line-height: 1.7;
}

/* ===================================
   FAQ Section
   =================================== */
.faq {
    background: var(--gray-50);
}

.faq-list {
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    background: var(--white);
    border-radius: 12px;
    margin-bottom: 16px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.faq-question {
    width: 100%;
    padding: 24px 28px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    text-align: left;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-900);
    transition: var(--transition-smooth);
}

.faq-question:hover {
    color: var(--primary-blue);
}

.faq-question svg {
    transition: transform 0.3s ease;
    flex-shrink: 0;
}

.faq-item.active .faq-question svg {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.4s ease;
}

.faq-item.active .faq-answer {
    max-height: 500px;
    padding: 0 28px 24px 28px;
}

.faq-answer p {
    color: var(--gray-700);
    line-height: 1.8;
}

/* ===================================
   Contact Section
   =================================== */
.contact {
    background: linear-gradient(180deg, var(--white) 0%, var(--off-white) 100%);
}

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

.contact-content {
    padding-top: 40px;
}

.contact-text {
    font-size: 1.125rem;
    color: var(--gray-700);
    line-height: 1.8;
    margin-bottom: 40px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px;
    background: var(--white);
    border-radius: 12px;
    border: 2px solid var(--gray-200);
    font-weight: 500;
    color: var(--gray-700);
}

.contact-item svg {
    color: var(--primary-blue);
    flex-shrink: 0;
}

.contact-form-wrapper {
    background: var(--white);
    padding: 48px;
    border-radius: 20px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

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

.form-group label {
    font-weight: 600;
    color: var(--gray-800);
    font-size: 0.95rem;
}

.form-group input,
.form-group textarea {
    padding: 14px 16px;
    border: 2px solid var(--gray-300);
    border-radius: 8px;
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition-smooth);
    background: var(--white);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.form-group textarea {
    resize: vertical;
}

.form-privacy {
    font-size: 0.875rem;
    color: var(--gray-500);
    text-align: center;
    margin-top: 8px;
}

.form-privacy a {
    color: var(--primary-blue);
    text-decoration: underline;
}

/* ===================================
   Footer
   =================================== */
.footer {
    background: var(--gray-900);
    color: var(--gray-300);
    padding: 80px 0 32px;
}

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

.footer-section .logo {
    color: var(--white);
    margin-bottom: 16px;
}

.footer-tagline {
    color: var(--gray-400);
    line-height: 1.6;
}

.footer-section h4 {
    color: var(--white);
    font-weight: 600;
    margin-bottom: 20px;
    font-size: 1rem;
}

.footer-section ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-section a {
    color: var(--gray-400);
    transition: var(--transition-smooth);
}

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

.footer-bottom {
    border-top: 1px solid var(--gray-800);
    padding-top: 32px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    text-align: center;
}

.footer-bottom p {
    color: var(--gray-500);
    font-size: 0.9rem;
}

.footer-disclaimer {
    font-size: 0.85rem;
    color: var(--gray-600);
    font-style: italic;
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 3.5rem;
    }

    .section-title {
        font-size: 2.5rem;
    }

    .mission-grid,
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 50px;
    }

    .visual-card {
        max-width: 400px;
        margin: 0 auto;
    }

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

@media (max-width: 768px) {
    :root {
        --section-padding: 80px;
    }

    .nav-links {
        display: none;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .hero-title {
        font-size: 2.75rem;
    }

    .hero-subtitle {
        font-size: 1.125rem;
    }

    .hero-cta {
        flex-direction: column;
        align-items: stretch;
    }

    .section-title {
        font-size: 2rem;
    }

    .section-subtitle {
        font-size: 1.125rem;
    }

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

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

    .contact-form-wrapper {
        padding: 32px 24px;
    }

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

@media (max-width: 480px) {
    .hero-title {
        font-size: 2.25rem;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .trust-badges {
        flex-direction: column;
        gap: 20px;
    }

    .stat-number {
        font-size: 2.75rem;
    }
}

/* ===================================
   Animations
   =================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-content > * {
    animation: fadeInUp 0.8s ease-out forwards;
}

.hero-title {
    animation-delay: 0.1s;
}

.hero-subtitle {
    animation-delay: 0.2s;
}

.hero-cta {
    animation-delay: 0.3s;
}

.trust-badges {
    animation-delay: 0.4s;
}

/* Smooth scroll offset for fixed navbar */
html {
    scroll-padding-top: 80px;
}