/* ===================================
   MedObsMind Landing Page Styles
   Mobile-first, WCAG AA Compliant
   =================================== */

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

:root {
    /* Color Palette */
    --gradient-start: #e6f7ff;
    --gradient-end: #f0f9ff;
    --teal-primary: #2a9d8f;
    --teal-dark: #1a7d6f;
    --teal-light: #4db8a9;
    --accent-coral: #e76f51;
    --dark-text: #264653;
    --medium-text: #666;
    --light-text: #999;
    --white: #ffffff;
    --shadow-light: rgba(42, 157, 143, 0.1);
    --shadow-medium: rgba(42, 157, 143, 0.2);
    --shadow-dark: rgba(42, 157, 143, 0.3);
    
    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.6;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* === Typography === */
body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--dark-text);
    background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
    background-attachment: fixed;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Accessible focus styles */
*:focus {
    outline: 3px solid var(--teal-primary);
    outline-offset: 2px;
}

*:focus:not(:focus-visible) {
    outline: none;
}

*:focus-visible {
    outline: 3px solid var(--teal-primary);
    outline-offset: 2px;
}

/* === Layout === */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

/* === Navigation === */
.nav {
    padding: var(--spacing-md) 0;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px var(--shadow-light);
}

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

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--teal-primary);
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    align-items: center;
}

.nav-links a {
    color: var(--dark-text);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
}

.nav-links a:hover,
.nav-links a:focus {
    color: var(--teal-primary);
    background: rgba(42, 157, 143, 0.05);
}

.cta-button {
    background: var(--teal-primary);
    color: var(--white) !important;
    padding: var(--spacing-xs) var(--spacing-md) !important;
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: all var(--transition-medium);
}

.cta-button:hover,
.cta-button:focus {
    background: var(--teal-dark) !important;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow-medium);
}

/* === Hero Section === */
.hero {
    min-height: 90vh;
    display: flex;
    flex-direction: column;
}

.hero-content {
    flex: 1;
    display: flex;
    align-items: center;
    padding: var(--spacing-xxl) 0;
}

.hero-content .container {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

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

.hero-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--dark-text);
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
    letter-spacing: -1px;
    animation: fadeInUp 0.8s ease;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--medium-text);
    margin-bottom: var(--spacing-lg);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    animation: fadeInUp 0.8s ease 0.2s backwards;
}

.primary-button {
    background: var(--teal-primary);
    color: var(--white);
    border: none;
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-medium);
    box-shadow: 0 4px 16px var(--shadow-medium);
    animation: fadeInUp 0.8s ease 0.4s backwards;
}

.primary-button:hover,
.primary-button:focus {
    background: var(--teal-dark);
    transform: translateY(-3px);
    box-shadow: 0 8px 24px var(--shadow-dark);
}

.primary-button.large {
    padding: 1.125rem 2.5rem;
    font-size: 1.125rem;
}

/* === Hero Badges === */
.hero-badges {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    justify-content: center;
}

.badge {
    background: var(--white);
    color: var(--teal-primary);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    font-weight: 600;
    box-shadow: 0 2px 8px var(--shadow-light);
    animation: fadeInUp 0.8s ease 0.5s backwards;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

@media (min-width: 768px) {
    .hero-badges {
        justify-content: flex-start;
    }
}

/* === Brainwave Animation === */
.hero-visual {
    display: flex;
    justify-content: center;
    animation: fadeIn 1s ease 0.6s backwards;
}

.brainwave-animation {
    width: 100%;
    max-width: 400px;
    height: auto;
    filter: drop-shadow(0 10px 30px var(--shadow-light));
}

.wave {
    animation: waveFlow 3s ease-in-out infinite;
}

.wave-1 {
    animation-delay: 0s;
}

.wave-2 {
    animation-delay: 0.3s;
}

.wave-3 {
    animation-delay: 0.6s;
}

.brain-outline {
    animation: pulse 4s ease-in-out infinite;
}

@keyframes waveFlow {
    0%, 100% {
        transform: translateX(0) scaleY(1);
        opacity: 0.7;
    }
    50% {
        transform: translateX(-5px) scaleY(1.1);
        opacity: 1;
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 0.4;
        transform: scale(1);
    }
    50% {
        opacity: 0.7;
        transform: scale(1.05);
    }
}

/* === Cards with 3D Effect === */
.card {
    background: var(--white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: 0 10px 40px var(--shadow-light);
    transition: all var(--transition-medium);
}

.card-3d {
    position: relative;
    transform-style: preserve-3d;
    perspective: 1000px;
}

.card-3d::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, var(--teal-primary), var(--teal-light));
    opacity: 0;
    transition: opacity var(--transition-medium);
    z-index: -1;
    transform: translateZ(-50px);
}

.card-3d:hover {
    transform: translateY(-10px) rotateX(2deg) rotateY(-2deg);
    box-shadow: 0 20px 60px var(--shadow-medium);
}

.card-3d:hover::before {
    opacity: 0.05;
}

.card h3 {
    font-size: 1.75rem;
    color: var(--dark-text);
    margin-bottom: var(--spacing-md);
    font-weight: 700;
}

.card p {
    color: var(--medium-text);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

/* === Section Headers === */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xxl);
}

.section-header h2 {
    font-size: 2.5rem;
    color: var(--dark-text);
    margin-bottom: var(--spacing-md);
    font-weight: 700;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--medium-text);
    max-width: 700px;
    margin: 0 auto;
}

/* === Story Timeline Section === */
.story-section {
    background: rgba(255, 255, 255, 0.5);
}

.story-timeline {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.timeline-item {
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
}

.timeline-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    display: block;
}

.timeline-item h3 {
    font-size: 1.25rem;
    color: var(--teal-primary);
    margin-bottom: var(--spacing-sm);
}

.timeline-item p {
    font-size: 0.9375rem;
    line-height: 1.6;
    margin-bottom: 0;
}

/* === Vision Section === */
.vision-section {
    background: linear-gradient(135deg, rgba(42, 157, 143, 0.03) 0%, rgba(42, 157, 143, 0.08) 100%);
}

.vision-card {
    max-width: 1000px;
    margin: 0 auto;
}

.vision-card h2 {
    text-align: center;
    font-size: 2rem;
    color: var(--dark-text);
    margin-bottom: var(--spacing-md);
}

.vision-intro {
    text-align: center;
    font-size: 1.125rem;
    color: var(--medium-text);
    margin-bottom: var(--spacing-xl);
}

.vision-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.vision-point {
    background: rgba(42, 157, 143, 0.05);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    transition: all var(--transition-medium);
}

.vision-point:hover {
    background: rgba(42, 157, 143, 0.1);
    transform: translateY(-5px);
}

.vision-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
    display: block;
}

.vision-point h4 {
    color: var(--teal-primary);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xs);
}

.vision-point p {
    font-size: 0.9375rem;
    line-height: 1.6;
    margin-bottom: 0;
}

/* === Use Cases Section === */
.usecases-section {
    background: var(--white);
}

.usecases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
}

.usecase-card {
    background: var(--gradient-start);
    padding: var(--spacing-xl);
    text-align: center;
}

.usecase-icon {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-md);
    display: block;
}

.usecase-card h3 {
    font-size: 1.5rem;
    color: var(--teal-primary);
    margin-bottom: var(--spacing-md);
}

.usecase-card p {
    font-size: 0.9375rem;
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
    text-align: left;
}

.usecase-features {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    justify-content: center;
    margin-top: var(--spacing-md);
}

.feature-tag {
    background: var(--teal-primary);
    color: var(--white);
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
}

/* === Technology Section === */
.technology-section {
    background: rgba(255, 255, 255, 0.3);
}

.technology-section .card {
    max-width: 1000px;
    margin: 0 auto;
}

.technology-section h2 {
    text-align: center;
    font-size: 2rem;
    color: var(--dark-text);
    margin-bottom: var(--spacing-md);
}

.tech-intro {
    text-align: center;
    font-size: 1.125rem;
    color: var(--medium-text);
    margin-bottom: var(--spacing-xl);
}

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

.tech-feature {
    background: rgba(42, 157, 143, 0.05);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    transition: all var(--transition-medium);
}

.tech-feature:hover {
    background: rgba(42, 157, 143, 0.1);
    transform: translateX(5px);
}

.tech-feature h4 {
    color: var(--teal-primary);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-sm);
}

.tech-feature p {
    font-size: 0.9375rem;
    line-height: 1.6;
    margin-bottom: 0;
}

/* === Privacy Section === */
.privacy-section .card {
    text-align: center;
}

.card-icon {
    margin-bottom: var(--spacing-lg);
    display: flex;
    justify-content: center;
}

.shield-icon {
    width: 100px;
    height: 120px;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

.feature-list {
    list-style: none;
    text-align: left;
    max-width: 400px;
    margin: var(--spacing-lg) auto 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--spacing-sm);
}

.feature-list li {
    padding: var(--spacing-sm);
    background: rgba(42, 157, 143, 0.05);
    border-radius: var(--radius-sm);
    color: var(--dark-text);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.feature-list li:hover {
    background: rgba(42, 157, 143, 0.1);
    transform: translateX(5px);
}

/* === Insights Section === */
.insights-section {
    background: rgba(255, 255, 255, 0.3);
}

.card-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.data-viz-mockup {
    margin-top: var(--spacing-lg);
}

.data-viz-mockup svg {
    width: 100%;
    height: auto;
    max-width: 500px;
    display: block;
    margin: 0 auto;
}

.bar {
    animation: barGrow 1s ease backwards;
}

.bar-1 { animation-delay: 0.1s; }
.bar-2 { animation-delay: 0.2s; }
.bar-3 { animation-delay: 0.3s; }
.bar-4 { animation-delay: 0.4s; }
.bar-5 { animation-delay: 0.5s; }

@keyframes barGrow {
    from {
        transform: scaleY(0);
        transform-origin: bottom;
    }
    to {
        transform: scaleY(1);
        transform-origin: bottom;
    }
}

.trend-line {
    stroke-dasharray: 1000;
    stroke-dashoffset: 1000;
    animation: drawLine 2s ease forwards 0.6s;
}

@keyframes drawLine {
    to {
        stroke-dashoffset: 0;
    }
}

.data-point {
    animation: pointPop 0.5s ease backwards;
}

.data-point:nth-child(1) { animation-delay: 0.8s; }
.data-point:nth-child(2) { animation-delay: 1s; }
.data-point:nth-child(3) { animation-delay: 1.2s; }
.data-point:nth-child(4) { animation-delay: 1.4s; }
.data-point:nth-child(5) { animation-delay: 1.6s; }

@keyframes pointPop {
    0% {
        transform: scale(0);
        opacity: 0;
    }
    50% {
        transform: scale(1.3);
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

.viz-caption {
    text-align: center;
    margin-top: var(--spacing-md);
    font-style: italic;
    color: var(--medium-text);
}

/* === Ethics Section === */
.ethics-section .card {
    text-align: center;
}

.badge-container {
    display: flex;
    justify-content: center;
    margin-bottom: var(--spacing-lg);
}

.ethics-badge {
    width: 150px;
    height: 150px;
    animation: rotate3D 20s linear infinite, float 3s ease-in-out infinite;
    filter: drop-shadow(0 10px 30px var(--shadow-medium));
}

@keyframes rotate3D {
    0% {
        transform: rotateY(0deg);
    }
    100% {
        transform: rotateY(360deg);
    }
}

.ethics-principles {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.principle {
    padding: var(--spacing-md);
    background: rgba(42, 157, 143, 0.05);
    border-radius: var(--radius-md);
    transition: all var(--transition-medium);
}

.principle:hover {
    background: rgba(42, 157, 143, 0.1);
    transform: translateY(-5px);
}

.principle h4 {
    color: var(--teal-primary);
    margin-bottom: var(--spacing-xs);
    font-size: 1.125rem;
}

.principle p {
    margin-bottom: 0;
    font-size: 0.9375rem;
}

/* === CTA Section === */
.cta-section {
    background: linear-gradient(135deg, var(--teal-primary) 0%, var(--teal-dark) 100%);
    color: var(--white);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    animation: rotate 30s linear infinite;
}

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

.cta-content {
    position: relative;
    z-index: 1;
}

.cta-section h3 {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
    color: var(--white);
}

.cta-section p {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-lg);
    color: rgba(255, 255, 255, 0.9);
}

.cta-section .primary-button {
    background: var(--white);
    color: var(--teal-primary);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.cta-section .primary-button:hover,
.cta-section .primary-button:focus {
    background: var(--gradient-start);
    transform: translateY(-3px) scale(1.05);
}

/* === Footer === */
.footer {
    background: var(--dark-text);
    color: var(--white);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-section h4 {
    margin-bottom: var(--spacing-sm);
    color: var(--teal-light);
}

.footer-section ul {
    list-style: none;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color var(--transition-fast);
    display: block;
    margin-bottom: var(--spacing-xs);
}

.footer-section a:hover,
.footer-section a:focus {
    color: var(--teal-light);
}

.footer-section p {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.6;
}

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

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

/* === Animations === */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

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

/* === Responsive Design === */

/* Small devices (landscape phones, 576px and up) */
@media (min-width: 576px) {
    .hero-title {
        font-size: 3rem;
    }
}

/* Medium devices (tablets, 768px and up) */
@media (min-width: 768px) {
    :root {
        --font-size-base: 18px;
    }
    
    .hero-content .container {
        grid-template-columns: 1fr 1fr;
    }
    
    .hero-text {
        text-align: left;
    }
    
    .hero-title {
        font-size: 3.5rem;
    }
    
    .hero-subtitle {
        margin-left: 0;
        margin-right: 0;
    }
    
    .nav-links {
        gap: var(--spacing-lg);
    }
}

/* Large devices (desktops, 992px and up) */
@media (min-width: 992px) {
    .hero-title {
        font-size: 4rem;
    }
    
    .section {
        padding: var(--spacing-xxl) 0;
    }
}

/* Extra large devices (large desktops, 1200px and up) */
@media (min-width: 1200px) {
    .container {
        padding: 0 var(--spacing-lg);
    }
}

/* Mobile menu for smaller screens */
@media (max-width: 767px) {
    .nav-links {
        display: flex;
        flex-direction: column;
        gap: var(--spacing-xs);
    }
    
    .logo h1 {
        font-size: 1.25rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .card {
        padding: var(--spacing-md);
    }
    
    .ethics-principles {
        grid-template-columns: 1fr;
    }
}

/* Reduced motion for accessibility */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation: none !important;
        transition: none !important;
        scroll-behavior: auto !important;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .card {
        border: 2px solid var(--teal-primary);
    }
    
    .primary-button {
        border: 2px solid var(--white);
    }
}

/* Dark mode support (optional) */
@media (prefers-color-scheme: dark) {
    :root {
        --gradient-start: #1a2a3a;
        --gradient-end: #2a3a4a;
        --dark-text: #e0e0e0;
        --medium-text: #b0b0b0;
    }
    
    .card {
        background: rgba(255, 255, 255, 0.05);
        backdrop-filter: blur(10px);
    }
    
    .nav {
        background: rgba(0, 0, 0, 0.8);
    }
}