/* ---------
   RESET & VARIABLES
   --------- */
:root {
    /* Brand Colors */
    --navy: #0A192F;
    --navy-light: #112240;
    --cyan: #00E5FF;
    --cyan-dark: #00BEDA;
    --cyan-light: rgba(0, 229, 255, 0.1);
    
    /* Neutral Colors */
    --white: #FFFFFF;
    --bg-light: #F8FAFC;
    --bg-gray: #F1F5F9;
    --text-main: #1E293B;
    --text-muted: #64748B;
    --border-color: #E2E8F0;
    --footer-bg: #060F1E;
    
    /* Typography & Spacing */
    --font-main: 'Inter', sans-serif;
    --container-width: 1200px;
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    color: var(--text-main);
    background-color: var(--white);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

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

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

.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 2rem;
}

.section {
    padding: 6rem 0;
}

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

.section-header h2 {
    font-size: 2.5rem;
    color: var(--navy);
    margin-bottom: 1rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.section-header p {
    font-size: 1.125rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto;
}

/* ---------
   BUTTONS
   --------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: var(--transition);
    cursor: pointer;
}

.btn-primary {
    background-color: var(--cyan);
    color: var(--navy);
    box-shadow: 0 4px 14px var(--cyan-light);
}

.btn-primary:hover {
    background-color: var(--cyan-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 229, 255, 0.2);
}

.btn-outline {
    background: transparent;
    color: var(--navy);
    border: 1px solid var(--border-color);
}

.btn-outline:hover {
    border-color: var(--navy);
    background-color: var(--bg-light);
}

/* ---------
   NAVBAR
   --------- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 80px;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid transparent;
    z-index: 1000;
    transition: var(--transition);
}

.navbar.scrolled {
    height: 70px;
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo img {
    height: 55px;
    width: auto;
    transition: var(--transition);
}

.navbar.scrolled .logo img {
    height: 42px;
}

.nav-links {
    display: flex;
    gap: 2.5rem;
}

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

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--navy);
    cursor: pointer;
    font-size: 1.5rem;
}

/* ---------
   HERO
   --------- */
.hero {
    position: relative;
    padding: 10rem 0 7rem;
    background-color: var(--navy);
    color: var(--white);
    overflow: hidden;
    text-align: center;
}

/* Abstract Tech Background Element */
.hero-bg-accent {
    position: absolute;
    top: -50%;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(0,229,255,0.08) 0%, rgba(10,25,47,0) 70%);
    z-index: 1;
    pointer-events: none;
}

.hero-container {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero-content {
    max-width: 800px;
}

.badge {
    display: inline-block;
    padding: 0.35rem 1rem;
    background-color: var(--navy-light);
    color: var(--cyan);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    border-radius: 50px;
    margin-bottom: 2rem;
    border: 1px solid rgba(0, 229, 255, 0.2);
}

.hero-title {
    font-size: 4rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    letter-spacing: -0.03em;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: #94A3B8;
    margin-bottom: 2.5rem;
    max-width: 650px;
    margin-left: auto;
    margin-right: auto;
}

/* ---------
   TRUST BAR
   --------- */
.trust-bar {
    background-color: var(--bg-gray);
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.trust-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 3rem;
}

.trust-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

.trust-item i {
    color: var(--cyan-dark);
    width: 20px;
    height: 20px;
}

.trust-divider {
    width: 1px;
    height: 24px;
    background-color: #CBD5E1;
}

/* ---------
   METHODOLOGY
   --------- */
.methodology {
    background-color: var(--white);
}

.methodology-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2.5rem;
}

.method-card {
    background-color: var(--bg-light);
    padding: 3rem 2rem;
    border-radius: var(--radius-lg);
    text-align: center;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.method-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    border-color: var(--cyan-light);
}

.icon-wrapper {
    width: 64px;
    height: 64px;
    background-color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    box-shadow: 0 4px 10px rgba(0,0,0,0.03);
    color: var(--navy);
}

.icon-wrapper i {
    width: 32px;
    height: 32px;
}

.method-card h3 {
    font-size: 1.25rem;
    color: var(--navy);
    margin-bottom: 0.75rem;
}

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

/* ---------
   CATEGORIES
   --------- */
.categories {
    background-color: var(--bg-light);
}

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

.category-card {
    background-color: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0,0,0,0.03);
    transition: var(--transition);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.category-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0,0,0,0.08);
}

.card-image {
    position: relative;
    height: 220px;
    overflow: hidden;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.category-card:hover .card-image img {
    transform: scale(1.05);
}

.card-overlay {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 44px;
    height: 44px;
    background-color: rgba(255, 255, 255, 0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--navy);
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

.card-content {
    padding: 1.5rem;
}

.card-content h3 {
    font-size: 1.25rem;
    color: var(--navy);
    margin-bottom: 0.5rem;
}

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

/* ---------
   FOOTER
   --------- */
.footer {
    background-color: var(--footer-bg);
    color: #94A3B8;
    padding: 5rem 0 2rem;
}

.footer-top {
    display: flex;
    justify-content: space-between;
    margin-bottom: 3rem;
    flex-wrap: wrap;
    gap: 3rem;
}

.footer-brand {
    max-width: 350px;
}

.logo-wrapper {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.footer-logo {
    height: 36px;
    filter: brightness(0) invert(1);
}

.footer-brand-text {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--white);
    letter-spacing: -0.01em;
}

.footer-mission {
    font-size: 0.9rem;
    color: #cbd5e1;
}

.footer-links {
    display: flex;
    gap: 5rem;
    flex-wrap: wrap;
}

.link-column h4 {
    color: var(--white);
    font-size: 1rem;
    margin-bottom: 1.25rem;
}

.link-column a {
    display: block;
    margin-bottom: 0.75rem;
    font-size: 0.9rem;
    transition: var(--transition);
}

.link-column a:hover {
    color: var(--cyan);
    transform: translateX(3px);
}

.footer-compliance {
    border-top: 1px solid rgba(255,255,255,0.05);
    border-bottom: 1px solid rgba(255,255,255,0.05);
    padding: 2rem 0;
    margin-bottom: 2rem;
}

.fda-disclaimer {
    font-size: 0.65rem;
    text-transform: uppercase;
    text-align: justify;
    line-height: 1.6;
    color: #64748B;
    letter-spacing: 0.05em;
}

.footer-bottom {
    display: flex;
    justify-content: center;
    font-size: 0.85rem;
    color: #475569;
}

/* ---------
   RESPONSIVE
   --------- */
@media (max-width: 992px) {
    .hero-title {
        font-size: 3rem;
    }
    
    .trust-container {
        flex-wrap: wrap;
        gap: 1.5rem;
    }
    
    .trust-divider {
        display: none;
    }
    
    .methodology-grid,
    .category-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 80px;
        left: 0;
        width: 100%;
        background-color: var(--white);
        flex-direction: column;
        padding: 2rem;
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
        border-top: 1px solid var(--border-color);
        gap: 1.5rem;
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .nav-actions .btn-outline {
        display: none;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .hero {
        padding: 8rem 0 5rem;
    }
    
    .hero-title {
        font-size: 2.25rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .methodology-grid,
    .category-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-top {
        flex-direction: column;
        gap: 3rem;
    }
    
    .footer-links {
        flex-direction: column;
        gap: 2rem;
    }
}