/* Modern CSS Reset and Base Styles */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    /* New Brand Color Palette */
    --primary-orange: #F78631;
    --primary-blue: #2A7BD7;
    --primary-blue-dark: #2570D5;
    --primary-blue-light: #3DB3E1;
    --secondary-light-blue: #B4E0EE;
    --accent-bright-blue: #3FC3E6;
    --accent-medium-blue: #39A9DF;
    --background-light-blue: #CEF5FE;
    --background-very-light: #D8F2F3;
    
    /* Updated color references for consistency */
    --secondary-purple: #3FC3E6; /* Changed from purple to bright blue */
    --accent-green: #3DB3E1; /* Changed from green to medium blue */
    --accent-orange: #F78631; /* Updated to brand orange */
    
    /* Neutrals - keeping existing but with slight adjustments */
    --gray-50: #FDFEFD;
    --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;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 3.75rem;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
}

/* Base Styles */
html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--gray-50);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--space-4);
    color: var(--gray-900);
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-4xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }

p {
    margin-bottom: var(--space-4);
    color: var(--gray-600);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--gray-50);
    border-bottom: 1px solid var(--gray-200);
    z-index: 1000;
    transition: var(--transition-normal);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.nav-logo {
    height: 40px;
    width: auto;
    border-radius: var(--radius-md);
}

.nav-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--gray-900);
}

.nav-menu {
    display: flex;
    gap: var(--space-8);
}

.nav-link {
    color: var(--gray-600);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-fast);
    position: relative;
}

.nav-link:hover {
    color: var(--primary-orange);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-orange);
    transition: var(--transition-fast);
}

.nav-link:hover::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.bar {
    width: 25px;
    height: 3px;
    background: var(--gray-700);
    border-radius: var(--radius-full);
    transition: var(--transition-fast);
}

/* Hero Section */
.hero {
    padding: 120px 0 var(--space-24);
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-dark) 100%);
    color: white;
    overflow: hidden;
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 1000"><defs><radialGradient id="a" cx="50%" cy="50%"><stop offset="0%" stop-color="%23ffffff" stop-opacity="0.1"/><stop offset="100%" stop-color="%23ffffff" stop-opacity="0"/></radialGradient></defs><circle cx="200" cy="200" r="100" fill="url(%23a)"/><circle cx="800" cy="300" r="150" fill="url(%23a)"/><circle cx="400" cy="700" r="120" fill="url(%23a)"/></svg>');
    opacity: 0.3;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content {
    animation: fadeInUp 1s ease-out;
}

.hero-title {
    font-size: var(--font-size-6xl);
    font-weight: 700;
    margin-bottom: var(--space-6);
    line-height: 1.1;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary-orange), #ffffff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    margin-bottom: var(--space-8);
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: var(--space-4);
    margin-bottom: var(--space-12);
}

.hero-stats {
    display: flex;
    gap: var(--space-8);
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--primary-orange);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.8);
}

/* Phone Mockup */
.hero-image {
    display: flex;
    justify-content: center;
    animation: fadeInRight 1s ease-out;
}

.phone-mockup {
    width: 300px;
    height: 600px;
    background: linear-gradient(145deg, var(--primary-blue-dark), var(--primary-blue));
    border-radius: 40px;
    padding: 20px;
    box-shadow: var(--shadow-xl);
    position: relative;
}

.phone-mockup::before {
    content: '';
    position: absolute;
    top: 15px;
    left: 50%;
    transform: translateX(-50%);
    width: 120px;
    height: 6px;
    background: #1a202c;
    border-radius: var(--radius-full);
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: var(--background-light-blue);
    border-radius: 30px;
    overflow: hidden;
    position: relative;
}

.app-screenshot {
    max-width: 300px;
    height: auto;
    border-radius: 40px;
    border: 4px solid #000000;
    box-shadow: var(--shadow-xl);
    animation: fadeInRight 1s ease-out;
}

.app-interface {
    padding: var(--space-6);
    height: 100%;
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

.cognitive-score {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    text-align: center;
    box-shadow: var(--shadow-md);
}

.cognitive-score h3 {
    font-size: var(--font-size-lg);
    color: var(--gray-800);
    margin-bottom: var(--space-4);
}

.score-display {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    color: var(--primary-blue);
    margin-bottom: var(--space-2);
}

.score-change {
    color: var(--accent-green);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.feature-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3);
}

.feature-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    text-align: center;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
}

.feature-card .icon {
    font-size: var(--font-size-2xl);
}

.feature-card .label {
    font-size: var(--font-size-xs);
    color: var(--gray-600);
    font-weight: 500;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-lg);
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition-fast);
    cursor: pointer;
    border: none;
    font-size: var(--font-size-base);
}

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

.btn-primary:hover {
    background: var(--primary-blue-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
}

.btn-large {
    padding: var(--space-4) var(--space-8);
    font-size: var(--font-size-lg);
}

.btn-icon {
    font-size: var(--font-size-xl);
}

/* Section Headers */
.section-header {
    text-align: center;
    margin-bottom: var(--space-16);
}

.section-header h2 {
    margin-bottom: var(--space-4);
}

.section-header p {
    font-size: var(--font-size-lg);
    color: var(--gray-600);
    max-width: 600px;
    margin: 0 auto;
}

/* Features Section */
.features {
    padding: var(--space-24) 0;
    background: var(--background-very-light);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-8);
}

.feature-card-large {
    background: white;
    padding: var(--space-8);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
}

.feature-card-large:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.feature-icon {
    font-size: var(--font-size-5xl);
    margin-bottom: var(--space-4);
}

.feature-card-large h3 {
    margin-bottom: var(--space-4);
    color: var(--gray-900);
}

.feature-card-large p {
    margin-bottom: var(--space-6);
}

.feature-list {
    list-style: none;
    padding: 0;
}

.feature-list li {
    padding: var(--space-2) 0;
    color: var(--gray-600);
    position: relative;
    padding-left: var(--space-6);
}

.feature-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent-green);
    font-weight: 600;
}

/* Science Section */
.science {
    padding: var(--space-24) 0;
    background: white;
}

.science-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-8);
}

.science-card {
    text-align: center;
    padding: var(--space-8);
    border-radius: var(--radius-xl);
    background: linear-gradient(135deg, var(--gray-50), white);
    border: 1px solid var(--gray-200);
    transition: var(--transition-normal);
}

.science-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-orange);
}

.science-icon {
    font-size: var(--font-size-5xl);
    margin-bottom: var(--space-4);
}

.science-card h3 {
    margin-bottom: var(--space-4);
    color: var(--gray-900);
}

/* How It Works */
.how-it-works {
    padding: var(--space-24) 0;
    background: linear-gradient(135deg, var(--primary-blue-light), var(--accent-bright-blue));
    color: white;
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-12);
    margin-top: var(--space-16);
}

.step {
    text-align: center;
    position: relative;
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    background: var(--primary-orange);
    border-radius: var(--radius-full);
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--space-6);
    color: white;
    box-shadow: var(--shadow-lg);
}

.step-content h3 {
    margin-bottom: var(--space-4);
    color: white;
}

.step-content p {
    color: rgba(255, 255, 255, 0.9);
}

/* Download Section */
.download {
    padding: var(--space-24) 0;
    background: var(--gray-900);
    color: white;
    text-align: center;
}

.download-content h2 {
    color: white;
    margin-bottom: var(--space-6);
}

.download-content p {
    font-size: var(--font-size-lg);
    color: var(--gray-300);
    margin-bottom: var(--space-8);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.download-buttons {
    margin-bottom: var(--space-8);
}

.download-features {
    display: flex;
    justify-content: center;
    gap: var(--space-8);
    flex-wrap: wrap;
}

.download-feature {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.check {
    color: var(--primary-orange);
    font-weight: 600;
}

/* Footer */
.footer {
    background: var(--gray-900);
    color: var(--gray-300);
    padding: var(--space-16) 0 var(--space-8);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--space-16);
    margin-bottom: var(--space-8);
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.footer-logo {
    height: 40px;
    width: auto;
    border-radius: var(--radius-md);
}

.footer-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: white;
}

.footer-description {
    color: var(--gray-400);
    margin: 0;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-8);
}

.footer-column h4 {
    color: white;
    margin-bottom: var(--space-4);
    font-size: var(--font-size-base);
}

.footer-column a {
    display: block;
    color: var(--gray-400);
    text-decoration: none;
    padding: var(--space-1) 0;
    transition: var(--transition-fast);
}

.footer-column a:hover {
    color: var(--primary-blue-light);
}

.footer-bottom {
    border-top: 1px solid var(--gray-700);
    padding-top: var(--space-8);
    text-align: center;
}

.footer-bottom p {
    margin: 0;
    color: var(--gray-500);
}

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

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

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: var(--space-12);
        text-align: center;
    }
    
    .hero-title {
        font-size: var(--font-size-5xl);
    }
    
    .phone-mockup {
        width: 250px;
        height: 500px;
    }
    
    .features-grid {
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: var(--space-6);
        box-shadow: var(--shadow-lg);
        border-top: 1px solid var(--gray-200);
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero {
        padding: 100px 0 var(--space-16);
    }
    
    .hero-title {
        font-size: var(--font-size-4xl);
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-stats {
        justify-content: center;
        gap: var(--space-6);
    }
    
    .phone-mockup {
        width: 200px;
        height: 400px;
        padding: 15px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .science-grid {
        grid-template-columns: 1fr;
    }
    
    .steps {
        grid-template-columns: 1fr;
        gap: var(--space-8);
    }
    
    .download-features {
        flex-direction: column;
        align-items: center;
        gap: var(--space-4);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--space-8);
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-4);
    }
    
    .nav-container {
        padding: 0 var(--space-4);
    }
    
    .hero-title {
        font-size: var(--font-size-3xl);
    }
    
    .section-header h2 {
        font-size: var(--font-size-3xl);
    }
    
    .feature-card-large {
        padding: var(--space-6);
    }
    
    .science-card {
        padding: var(--space-6);
    }
}