/* =========================================
   1. RESET & VARIABLES
   ========================================= */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    /* Corporate Color Palette */
    --primary: #0F2C40;      /* Deep Navy - Trust/Authority */
    --accent: #2B6CB0;       /* Professional Blue - Tech/Medical */
    --accent-light: #EBF8FF; /* Very soft blue background */
    --text-dark: #1A202C;    /* Charcoal - Better than pure black */
    --text-light: #718096;   /* Cool Grey - Subtext */
    --white: #FFFFFF;
    --light-bg: #F7FAFC;     /* Off-white section bg */
    --border: #E2E8F0;

    /* Spacing & Layout */
    --container-width: 1200px;
    --header-height: 80px;
    --radius: 8px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Inter', sans-serif;
    color: var(--text-dark);
    line-height: 1.6;
    background-color: var(--white);
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
    color: var(--primary);
    line-height: 1.2;
    font-weight: 700;
}

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

ul {
    list-style: none;
}

/* =========================================
   2. UTILITY CLASSES
   ========================================= */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

.section-padding {
    padding: 100px 0;
}

.bg-light {
    background-color: var(--light-bg);
}

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

.section-title {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.section-subtitle {
    color: var(--text-light);
    font-size: 1.125rem;
    max-width: 600px;
    margin: 0 auto 3rem auto;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 14px 32px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    border: 2px solid transparent;
}

.btn-primary {
    background-color: var(--accent);
    color: var(--white);
    box-shadow: 0 4px 14px rgba(43, 108, 176, 0.3);
}

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

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

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

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

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

header.scrolled {
    box-shadow: 0 2px 20px rgba(0,0,0,0.05);
    border-bottom: 1px solid var(--border);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary);
    letter-spacing: -0.03em;
}

.logo span {
    color: var(--accent);
}

.nav-links {
    display: flex;
    gap: 40px;
}

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

.nav-links a:hover, .nav-links a.active {
    color: var(--accent);
}

.hamburger {
    display: none;
    cursor: pointer;
}

.bar {
    display: block;
    width: 25px;
    height: 3px;
    margin: 5px auto;
    background-color: var(--primary);
    transition: var(--transition);
}

/* =========================================
   4. PAGE SECTIONS
   ========================================= */

/* Hero */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #F7FAFC 0%, #EBF8FF 100%);
    padding-top: var(--header-height);
}

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

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    letter-spacing: -0.03em;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-light);
    margin-bottom: 2.5rem;
    max-width: 600px;
}

.hero-buttons {
    display: flex;
    gap: 20px;
}

/* Feature Grid */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.card {
    background: var(--white);
    padding: 40px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    transition: var(--transition);
}

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

.card-icon {
    font-size: 2rem;
    color: var(--accent);
    margin-bottom: 20px;
}

.card h3 {
    margin-bottom: 15px;
    font-size: 1.25rem;
}

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

/* How It Works (Steps) */
.steps-container {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 30px;
    counter-reset: step;
}

.step-item {
    flex: 1;
    min-width: 250px;
    position: relative;
    padding-left: 20px;
}

.step-number {
    font-size: 4rem;
    font-weight: 800;
    color: var(--accent-light);
    position: absolute;
    top: -30px;
    left: 0;
    z-index: -1;
}

/* About Page Specifics */
.about-hero {
    background-color: var(--primary);
    color: var(--white);
    padding: 120px 0;
    text-align: center;
}

.about-hero h1 {
    color: var(--white);
}

.about-hero p {
    color: #A0AEC0;
}

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

/* Contact Form */
.form-wrapper {
    max-width: 600px;
    margin: 0 auto;
    background: var(--white);
    padding: 40px;
    border-radius: var(--radius);
    box-shadow: 0 4px 20px rgba(0,0,0,0.05);
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    font-size: 0.9rem;
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-light);
}

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

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 60px;
}

.footer-col h4 {
    color: var(--white);
    margin-bottom: 20px;
}

.footer-col ul li {
    margin-bottom: 12px;
}

.footer-col a {
    color: #A0AEC0;
    font-size: 0.9rem;
}

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

.copyright {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 30px;
    text-align: center;
    color: #718096;
    font-size: 0.85rem;
}

/* =========================================
   5. MEDIA QUERIES
   ========================================= */
@media (max-width: 768px) {
    .hero h1 { font-size: 2.5rem; }
    
    .hamburger { display: block; }
    
    .nav-links {
        position: fixed;
        left: -100%;
        top: var(--header-height);
        flex-direction: column;
        background-color: var(--white);
        width: 100%;
        height: calc(100vh - var(--header-height));
        padding: 40px;
        transition: 0.3s;
        border-top: 1px solid var(--border);
    }
    
    .nav-links.active { left: 0; }
    
    .mission-vision, .steps-container {
        grid-template-columns: 1fr;
        flex-direction: column;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
}