:root {
    /* Colors */
    --bg-dark: #0f172a;
    --bg-card: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-primary: #38bdf8; /* Light Blue */
    --accent-secondary: #2dd4bf; /* Teal */
    --accent-tertiary: #fb923c; /* Orange */
    --success: #4ade80;
    --error: #f87171;
    
    /* Spacing */
    --container-width: 1200px;
    --section-padding: 80px;
    
    /* Fonts */
    --font-main: 'Inter', sans-serif;
    --font-display: 'Prompt', sans-serif;
}

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

body {
    font-family: var(--font-main);
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

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

a {
    text-decoration: none;
    color: inherit;
    transition: 0.3s ease;
}

ul {
    list-style: none;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

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

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

/* Navbar */
.navbar {
    padding: 20px 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

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

.logo {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
}

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

.nav-links a {
    margin-left: 30px;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

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

/* Hero Section */
.hero {
    padding-top: 160px;
    padding-bottom: 100px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -20%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(56, 189, 248, 0.1) 0%, rgba(15, 23, 42, 0) 70%);
    border-radius: 50%;
    z-index: -1;
}

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

.hero-text .badge {
    display: inline-block;
    padding: 6px 12px;
    background: rgba(56, 189, 248, 0.1);
    color: var(--accent-primary);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 20px;
    border: 1px solid rgba(56, 189, 248, 0.2);
}

.hero-text h1 {
    font-size: 3.5rem;
    margin-bottom: 20px;
}

.hero-text .subheadline {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    max-width: 500px;
}

.cta-group {
    display: flex;
    gap: 20px;
}

.btn {
    padding: 12px 28px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: var(--bg-dark);
    border: none;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(56, 189, 248, 0.2);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-secondary:hover {
    border-color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

/* Hero Visual & QR Placeholder */
.qr-placeholder {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.qr-code-box {
    width: 200px;
    height: 200px;
    background: white;
    border-radius: 20px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: var(--bg-dark);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    z-index: 2;
    position: relative;
}

.qr-code-box i {
    font-size: 80px;
    margin-bottom: 10px;
}

.qr-code-box span {
    font-weight: 600;
    font-size: 0.9rem;
}

.phone-mockup {
    position: absolute;
    width: 280px;
    height: 400px;
    background: var(--bg-card);
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: 30px;
    top: -40px;
    right: 20px;
    z-index: 1;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 15px;
    opacity: 0.6;
    transform: rotate(5deg);
}

.chat-bubble {
    padding: 10px 15px;
    border-radius: 12px;
    font-size: 0.8rem;
    max-width: 80%;
}

.chat-bubble.left {
    background: rgba(255, 255, 255, 0.1);
    align-self: flex-start;
    border-bottom-left-radius: 2px;
}

.chat-bubble.right {
    background: rgba(45, 212, 191, 0.2);
    color: var(--accent-secondary);
    align-self: flex-end;
    border-bottom-right-radius: 2px;
}

/* Comparison Section */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.section-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.comparison-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.card {
    background: var(--bg-card);
    padding: 40px;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: transform 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    border-color: rgba(255, 255, 255, 0.1);
}

.icon-box {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    margin-bottom: 25px;
}

.icon-box.error {
    background: rgba(248, 113, 113, 0.1);
    color: var(--error);
}

.icon-box.success {
    background: rgba(74, 222, 128, 0.1);
    color: var(--success);
}

.card h3 {
    font-size: 1.5rem;
    margin-bottom: 20px;
}

.card ul li {
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 15px;
    color: var(--text-secondary);
}

.old-way ul li i {
    color: var(--error);
}

.new-way ul li i {
    color: var(--success);
}

/* Features Section */
.features-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.group-title {
    font-size: 1.2rem;
    color: var(--accent-primary);
    margin-bottom: 30px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.feature-card {
    padding: 30px;
    margin-bottom: 20px;
    background: rgba(30, 41, 59, 0.5);
}

.feature-icon {
    font-size: 1.5rem;
    color: var(--accent-secondary);
    margin-bottom: 15px;
}

.feature-card h4 {
    font-size: 1.2rem;
    margin-bottom: 10px;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Tech Stack */
.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 30px;
}

.tech-item {
    background: var(--bg-card);
    padding: 30px 20px;
    border-radius: 16px;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: 0.3s ease;
}

.tech-item:hover {
    border-color: var(--accent-primary);
    transform: translateY(-5px);
}

.tech-icon {
    font-size: 2.5rem;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.tech-item span {
    display: block;
    font-weight: 600;
    margin-bottom: 5px;
}

.tech-item small {
    color: var(--text-secondary);
    font-size: 0.8rem;
}

/* How It Works */
.timeline {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    position: relative;
    max-width: 900px;
    margin: 0 auto;
}

.step {
    text-align: center;
    flex: 1;
    position: relative;
    z-index: 2;
}

.step-number {
    width: 60px;
    height: 60px;
    background: var(--bg-card);
    border: 2px solid var(--accent-tertiary);
    color: var(--accent-tertiary);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto 25px;
    transition: 0.3s ease;
}

.step:hover .step-number {
    background: var(--accent-tertiary);
    color: white;
}

.step-content h4 {
    margin-bottom: 10px;
    color: var(--text-primary);
}

.step-content p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    padding: 0 10px;
}

.step-connector {
    flex: 1;
    height: 2px;
    background: rgba(255, 255, 255, 0.1);
    margin-top: 30px;
}

/* Footer */
footer {
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding: 40px 0;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.credits {
    margin-top: 10px;
    color: var(--accent-primary);
}

/* Animations */
.fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

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

.delay-100 {
    transition-delay: 0.1s;
}

/* Responsive */
@media (max-width: 968px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-text .subheadline {
        margin: 0 auto 40px;
    }
    
    .cta-group {
        justify-content: center;
    }
    
    .hero-visual {
        margin-top: 50px;
    }
    
    .comparison-grid {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .timeline {
        flex-direction: column;
        align-items: center;
        gap: 30px;
    }
    
    .step-connector {
        width: 2px;
        height: 50px;
        flex: none;
        margin: 0;
    }
}

@media (max-width: 480px) {
    .hero-text h1 {
        font-size: 2.5rem;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .cta-group {
        flex-direction: column;
    }
}