/* 
   Styles for eHealthAI
   Minimalist single page website for healthcare AI
*/

/* ===== VARIABLES ===== */
:root {
    /* Corporate colors */
    --green: #3CB371;
    --dark-gray: #4F5359;
    --light-gray: #8A9299;
    --white: #FFFFFF;
    --off-white: #F9FAFB;
    
    /* Secondary colors from brain image */
    --blue: #3498DB;
    --yellow: #F1C40F;
    --magenta: #E91E63;
    --purple: #9B59B6;
    --turquoise: #1ABC9C;
    --light-green: #7ED957;
    --orange: #F39C12;
    
    /* Spacing */
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;
}

/* ===== RESET & BASE STYLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: 'Montserrat', sans-serif;
    background-color: var(--white);
    color: var(--dark-gray);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

h1, h2, h3 {
    font-weight: 700;
    line-height: 1.2;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--dark-gray);
}

h2 {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
    color: var(--green);
}

p {
    margin-bottom: var(--spacing-sm);
}

/* ===== CIRCLES OVERLAY ===== */
.circles-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: radial-gradient(circle at 10% 20%, rgba(60, 179, 113, 0.03) 10px, transparent 80px),
                      radial-gradient(circle at 90% 30%, rgba(52, 152, 219, 0.03) 20px, transparent 100px),
                      radial-gradient(circle at 30% 70%, rgba(241, 196, 15, 0.03) 15px, transparent 70px),
                      radial-gradient(circle at 70% 80%, rgba(155, 89, 182, 0.03) 25px, transparent 120px);
    z-index: -1;
    pointer-events: none;
}

/* ===== HEADER ===== */
header {
    padding: var(--spacing-md) 0;
    background-color: var(--white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.logo-container {
    display: flex;
    justify-content: center;
    align-items: center;
}

.logo {
    max-width: 300px;
    height: auto;
}

/* ===== HERO SECTION ===== */
.hero {
    padding: var(--spacing-lg) 0;
    text-align: center;
    position: relative;
}

.hero h1 {
    background: linear-gradient(to right, var(--green), var(--blue));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    display: inline-block;
    padding-bottom: 10px;
    position: relative;
}

.hero h1::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 25%;
    width: 50%;
    height: 3px;
    background: linear-gradient(to right, var(--green), var(--blue));
}

.tagline {
    font-size: 1.2rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto var(--spacing-lg);
}

.brain-image-container {
    max-width: 300px;
    margin: 0 auto;
    opacity: 0.9;
    transition: transform 0.5s ease;
}

.brain-image {
    width: 100%;
    height: auto;
}

.brain-image-container:hover {
    transform: scale(1.05);
}

/* ===== PILLARS SECTION ===== */
.pillars {
    padding: var(--spacing-xl) 0;
    background-color: var(--off-white);
}

.pillar-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.pillar {
    text-align: center;
    padding: var(--spacing-md);
    border-radius: 8px;
    background-color: var(--white);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
    overflow: hidden;
}

.pillar::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(to right, var(--green), var(--blue));
}

.pillar:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.pillar-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.pillar-icon::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: conic-gradient(from 0deg, var(--green), var(--blue), var(--green));
    animation: rotate 8s linear infinite;
}

.pillar-icon::after {
    content: '';
    position: absolute;
    width: 90%;
    height: 90%;
    border-radius: 50%;
    background-color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
}

@keyframes rotate {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

.brain-icon::after {
    content: '🧠';
    font-size: 1.8rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.data-icon::after {
    content: '📊';
    font-size: 1.8rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.system-icon::after {
    content: '⚙️';
    font-size: 1.8rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.pillar p {
    color: var(--light-gray);
}

/* ===== GRADIENT SECTION ===== */
.gradient-section {
    padding: var(--spacing-xl) 0;
    text-align: center;
    background-color: var(--white);
}

.gradient-text {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
}

.gradient-word {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(to right, var(--green), var(--blue));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    padding: 0 var(--spacing-sm);
    position: relative;
}

.gradient-word::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(to right, var(--green), var(--blue));
    transform: scaleX(0);
    transition: transform 0.3s ease;
    transform-origin: left;
}

.gradient-word:hover::after {
    transform: scaleX(1);
}

/* ===== FOOTER ===== */
footer {
    padding: var(--spacing-lg) 0;
    background-color: var(--off-white);
    border-top: 1px solid rgba(0, 0, 0, 0.05);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.copyright, .brand-info, .contact {
    font-size: 0.9rem;
    color: var(--light-gray);
}

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

.contact {
    color: var(--green);
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    html {
        font-size: 14px;
    }
    
    .pillar-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .gradient-text {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .brain-image-container {
        max-width: 200px;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 12px;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .gradient-word {
        font-size: 2rem;
    }
    
    .logo {
        max-width: 200px;
    }
}