/* ============================================
   CSS Variables & Reset
   ============================================ */

:root {
    /* Colors */
    --color-primary: #1a1a1a;
    --color-secondary: #2A52BE;
    --color-accent: #ffcc00;
    --color-bg: #fafafa;
    --color-bg-alt: #ffffff;
    --color-text: #1a1a1a;
    --color-text-muted: #666666;
    --color-border: #e0e0e0;
    --color-highlight: #fff8e1;
    
    /* Typography */
    --font-display: 'Bitter', serif;
    --font-body: 'Work Sans', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Layout */
    --container-width: 1200px;
    --container-wide: 1400px;
    --border-radius: 4px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.6;
    font-size: 16px;
    overflow-x: hidden;
}

/* ============================================
   Typography
   ============================================ */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

h1 { font-size: clamp(2.5rem, 6vw, 5rem); }
h2 { font-size: clamp(2rem, 4vw, 3.5rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: var(--spacing-sm);
    max-width: 70ch;
}

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

/* ============================================
   Layout Utilities
   ============================================ */

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.container-wide {
    max-width: var(--container-wide);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

.section-title {
    margin-bottom: var(--spacing-md);
    position: relative;
}

.section-intro {
    font-size: 1.25rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-lg);
    max-width: 60ch;
}

/* ============================================
   Navigation
   ============================================ */

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--color-bg-alt);
    border-bottom: 2px solid var(--color-primary);
    z-index: 1000;
    transition: transform var(--transition-normal);
}

.nav-container {
    max-width: var(--container-wide);
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-display);
    font-weight: 900;
    font-size: 1.25rem;
    letter-spacing: -0.02em;
}

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

.nav-link {
    font-weight: 500;
    text-transform: uppercase;
    font-size: 0.875rem;
    letter-spacing: 0.05em;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-secondary);
    transition: width var(--transition-normal);
}

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

.nav-cta {
    background: var(--color-primary);
    color: var(--color-bg);
    padding: 0.5rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.875rem;
    letter-spacing: 0.05em;
}

.nav-cta:hover {
    background: var(--color-secondary);
    transform: translateY(-2px);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-primary);
    transition: all var(--transition-normal);
}

/* ============================================
   Hero Section
   ============================================ */

.hero {
    min-height: 100vh;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
    padding-top: calc(var(--spacing-xl) + 60px);
    padding-bottom: var(--spacing-xl);
    max-width: var(--container-wide);
    margin: 0 auto;
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-md);
}

.hero-content {
    animation: fadeInUp 0.8s ease;
}

.hero-badge {
    display: inline-block;
    background: var(--color-primary);
    color: var(--color-bg);
    padding: 0.5rem 1rem;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: var(--spacing-md);
}

.hero-title {
    margin-bottom: var(--spacing-md);
}

.highlight {
    position: relative;
    display: inline-block;
}

.highlight::after {
    content: '';
    position: absolute;
    bottom: 0.1em;
    left: 0;
    right: 0;
    height: 0.3em;
    background: var(--color-accent);
    z-index: -1;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-muted);
    max-width: 50ch;
}

.hero-cta-group {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.hero-visual {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    animation: fadeInRight 1s ease 0.2s backwards;
}

.tablet-mockup {
    width: 300px;
    height: 400px;
    background: var(--color-primary);
    border-radius: 20px;
    padding: 1rem;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    position: relative;
    z-index: 2;
}

.tablet-screen {
    width: 100%;
    height: 100%;
    background: #e8e8e8;
    border-radius: 10px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr 1fr;
    gap: 1rem;
    padding: 1rem;
}

.fake-app {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 8px;
    animation: pulse 2s ease-in-out infinite;
}

.fake-app:nth-child(2) {
    animation-delay: 0.2s;
}

.fake-app:nth-child(3) {
    animation-delay: 0.4s;
}

.fake-app:nth-child(4) {
    animation-delay: 0.6s;
}

.visual-accent {
    position: absolute;
    width: 400px;
    height: 400px;
    background: var(--color-accent);
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.3;
    z-index: 1;
    animation: float 6s ease-in-out infinite;
}

/* ============================================
   Buttons
   ============================================ */

.btn {
    display: inline-block;
    padding: 1rem 2rem;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.875rem;
    letter-spacing: 0.05em;
    border-radius: var(--border-radius);
    transition: all var(--transition-normal);
    cursor: pointer;
    border: none;
    font-family: var(--font-body);
}

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

.btn-primary:hover {
    background: #cc0000;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(255, 68, 68, 0.3);
}

.btn-secondary {
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

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

.btn-large {
    padding: 1.25rem 3rem;
    font-size: 1rem;
}

/* ============================================
   How It Works Section
   ============================================ */

.how-it-works {
    background: var(--color-bg-alt);
}

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

.step {
    position: relative;
}

.step-number {
    font-family: var(--font-display);
    font-size: 5rem;
    font-weight: 900;
    color: var(--color-accent);
    line-height: 1;
    margin-bottom: var(--spacing-sm);
    opacity: 0.3;
}

.step h3 {
    margin-bottom: var(--spacing-sm);
}

.step p {
    color: var(--color-text-muted);
}

/* ============================================
   Benefits Section
   ============================================ */

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

.benefits .section-title {
    color: var(--color-bg);
}

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

.benefit-card {
    background: rgba(255, 255, 255, 0.05);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    transition: all var(--transition-normal);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.benefit-card:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-4px);
}

.benefit-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.benefit-card h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--color-accent);
}

.benefit-card p {
    color: rgba(255, 255, 255, 0.8);
}

/* ============================================
   How To Do It Section
   ============================================ */

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

.doit .section-title {
    color: var(--color-bg);
}

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

.doit-card {
    background: rgba(255, 255, 255, 0.05);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    transition: all var(--transition-normal);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.doit-card:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-4px);
}

.doit-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.doit-card h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--color-accent);
}

.doit-card p {
    color: rgba(255, 255, 255, 0.8);
}

/* ============================================
   About Section
   ============================================ */

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-lg);
    align-items: start;
}

.about-text p {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-md);
    max-width: 100%;
}

.about-highlight {
    background: var(--color-highlight);
    padding: var(--spacing-md);
    border-left: 4px solid var(--color-accent);
    margin-top: var(--spacing-md);
    font-size: 1.125rem;
}

.about-stats {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    position: sticky;
    top: 100px;
}

.stat {
    background: var(--color-bg-alt);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    border: 2px solid var(--color-primary);
}

.stat-number {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 900;
    color: var(--color-secondary);
    line-height: 1;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
}

/* ============================================
   Blog Section
   ============================================ */

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

.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

.blog-card {
    background: var(--color-bg);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    border: 2px solid var(--color-border);
    transition: all var(--transition-normal);
}

.blog-card:hover {
    border-color: var(--color-secondary);
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.blog-date {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
}

.blog-card h3 {
    margin-bottom: var(--spacing-sm);
}

.blog-card p {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
}

.blog-link {
    font-weight: 600;
    color: var(--color-secondary);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.blog-link:hover {
    gap: 1rem;
}

/* ============================================
   Research Section
   ============================================ */

.research-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: var(--spacing-md);
}

.research-card {
    background: var(--color-bg-alt);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    border-left: 4px solid var(--color-accent);
    transition: all var(--transition-normal);
}

.research-card:hover {
    border-left-color: var(--color-secondary);
    transform: translateX(4px);
}

.research-tag {
    display: inline-block;
    background: var(--color-primary);
    color: var(--color-bg);
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-sm);
}

.research-card h3 {
    margin-bottom: var(--spacing-sm);
}

.research-card p {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
}

.research-link {
    font-weight: 600;
    color: var(--color-secondary);
}

/* ============================================
   CTA Section
   ============================================ */

.cta-section {
    background: var(--color-secondary);
    color: var(--color-bg);
    text-align: center;
}

.cta-content h2 {
    color: var(--color-bg);
    margin-bottom: var(--spacing-sm);
}

.cta-content p {
    font-size: 1.25rem;
    margin: 0 auto var(--spacing-md);
}

.cta-note {
    font-size: 0.875rem;
    opacity: 0.8;
    margin-top: var(--spacing-sm);
}

.cta-section .btn {
    background: var(--color-primary);
    color: var(--color-bg);
}

.cta-section .btn:hover {
    background: var(--color-bg);
    color: var(--color-primary);
}

/* ============================================
   Contact Section
   ============================================ */

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

.contact-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-lg);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    font-size: 0.875rem;
    letter-spacing: 0.05em;
}

.form-group input,
.form-group textarea {
    padding: 0.75rem;
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius);
    font-family: var(--font-body);
    font-size: 1rem;
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-secondary);
}

.contact-info {
    padding: var(--spacing-md);
    background: var(--color-bg);
    border-radius: var(--border-radius);
    border: 2px solid var(--color-border);
}

.contact-info h3 {
    margin-bottom: var(--spacing-sm);
}

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

.contact-info a {
    color: var(--color-secondary);
    font-weight: 600;
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.social-links a {
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.875rem;
    letter-spacing: 0.05em;
}

.social-links a:hover {
    color: var(--color-secondary);
}

/* ============================================
   Footer
   ============================================ */

.footer {
    background: var(--color-primary);
    color: var(--color-bg);
    padding: var(--spacing-lg) 0 var(--spacing-md);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.footer-logo {
    font-family: var(--font-display);
    font-weight: 900;
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.7);
}

.footer-links {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.footer-column h4 {
    margin-bottom: var(--spacing-sm);
    color: var(--color-accent);
}

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

.footer-column li {
    margin-bottom: var(--spacing-xs);
}

.footer-column a {
    color: rgba(255, 255, 255, 0.7);
    transition: color var(--transition-fast);
}

.footer-column a:hover {
    color: var(--color-bg);
}

.footer-bottom {
    text-align: center;
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.875rem;
}

/* ============================================
   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);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 0.6;
    }
    50% {
        opacity: 1;
    }
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0);
    }
    50% {
        transform: translate(20px, -20px);
    }
}

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

@media (max-width: 1024px) {
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-content {
        order: 1;
    }
    
    .hero-visual {
        order: 2;
        margin-top: var(--spacing-lg);
    }
    
    .hero-cta-group {
        justify-content: center;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .about-stats {
        position: static;
        flex-direction: row;
        flex-wrap: wrap;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-lg: 3rem;
        --spacing-xl: 4rem;
    }
    
    .nav-menu {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background: var(--color-bg-alt);
        flex-direction: column;
        padding: var(--spacing-md);
        border-bottom: 2px solid var(--color-primary);
        transform: translateY(-100%);
        opacity: 0;
        transition: all var(--transition-normal);
        pointer-events: none;
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
    }
    
    .steps-grid {
        grid-template-columns: 1fr;
    }
    
    .benefits-grid {
        grid-template-columns: 1fr;
    }
    
    .blog-grid {
        grid-template-columns: 1fr;
    }
    
    .research-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
    
    .tablet-mockup {
        width: 240px;
        height: 320px;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.75rem;
    }
    
    .hero-badge {
        font-size: 0.625rem;
        padding: 0.4rem 0.8rem;
    }
    
    .btn {
        width: 100%;
        text-align: center;
    }
    
    .hero-cta-group {
        flex-direction: column;
    }
    
    .step-number {
        font-size: 3rem;
    }
}