:root {
    --primary-color: #1A73E8;
    --primary-dark: #1557B0;
    --secondary-color: #34A853;
    --text-dark: #202124;
    --text-gray: #5F6368;
    --text-light: #80868B;
    --background: #FFFFFF;
    --background-light: #F8F9FA;
    --border-color: #DADCE0;
    --shadow-sm: 0 1px 2px 0 rgba(60,64,67,0.3), 0 1px 3px 1px rgba(60,64,67,0.15);
    --shadow-md: 0 1px 3px 0 rgba(60,64,67,0.3), 0 4px 8px 3px rgba(60,64,67,0.15);
    --shadow-lg: 0 4px 6px -2px rgba(60,64,67,0.3), 0 10px 15px -3px rgba(60,64,67,0.15);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text-dark);
    line-height: 1.6;
    background: var(--background);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Navbar */
.navbar {
    background: var(--background);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

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

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    font-size: 20px;
    color: var(--text-dark);
}

.logo-icon {
    width: 32px;
    height: 32px;
    color: var(--primary-color);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-gray);
    font-weight: 500;
    transition: color 0.2s;
}

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

/* Buttons */
.btn-primary, .btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.2s;
    border: none;
    cursor: pointer;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
    background: rgba(26, 115, 232, 0.05);
}

.btn-large {
    padding: 16px 32px;
    font-size: 16px;
}

.btn-icon {
    width: 20px;
    height: 20px;
}

/* Hero */
.hero {
    padding: 80px 0;
    background: linear-gradient(135deg, #EBF4FF 0%, #F8F9FA 100%);
}

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

.hero-content {
    max-width: 540px;
}

.hero-title {
    font-size: 56px;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
    background: linear-gradient(135deg, #1A73E8 0%, #34A853 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--text-gray);
    margin-bottom: 32px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
}

/* Phone Mockup */
.phone-mockup {
    width: 280px;
    height: 560px;
    background: #1F1F1F;
    border-radius: 40px;
    padding: 12px;
    box-shadow: var(--shadow-lg);
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: #EBF0F8;
    border-radius: 32px;
    overflow: hidden;
}

.app-preview {
    padding: 40px 20px;
}

.preview-header {
    font-size: 18px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 120px;
}

.preview-input {
    background: white;
    padding: 16px;
    border-radius: 12px;
    text-align: center;
    color: var(--text-light);
    margin-bottom: 16px;
    box-shadow: var(--shadow-sm);
}

.preview-button {
    background: var(--primary-color);
    color: white;
    padding: 16px;
    border-radius: 12px;
    text-align: center;
    font-weight: 600;
    margin-top: 80px;
}

/* Features */
.features {
    padding: 100px 0;
}

.section-title {
    text-align: center;
    font-size: 48px;
    font-weight: 800;
    margin-bottom: 16px;
}

.section-subtitle {
    text-align: center;
    font-size: 20px;
    color: var(--text-gray);
    margin-bottom: 60px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.feature-card {
    padding: 32px;
    background: var(--background);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    transition: all 0.3s;
}

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

.feature-icon {
    width: 48px;
    height: 48px;
    background: rgba(26, 115, 232, 0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.feature-icon svg {
    width: 28px;
    height: 28px;
    color: var(--primary-color);
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-gray);
    line-height: 1.6;
}

/* How It Works */
.how-it-works {
    padding: 100px 0;
    background: var(--background-light);
}

.steps {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 40px;
    margin-bottom: 60px;
}

.step {
    text-align: center;
    max-width: 200px;
}

.step-number {
    width: 56px;
    height: 56px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 700;
    margin: 0 auto 16px;
}

.step h3 {
    font-size: 20px;
    margin-bottom: 8px;
}

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

.step-arrow {
    font-size: 32px;
    color: var(--primary-color);
    font-weight: 700;
}

.analysis-details {
    max-width: 600px;
    margin: 0 auto;
    padding: 32px;
    background: white;
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
}

.analysis-details h3 {
    font-size: 24px;
    margin-bottom: 20px;
}

.analysis-list {
    list-style: none;
}

.analysis-list li {
    padding: 12px 0;
    padding-left: 32px;
    position: relative;
    color: var(--text-gray);
}

.analysis-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--secondary-color);
    font-weight: 700;
    font-size: 20px;
}

/* Download */
.download {
    padding: 100px 0;
    text-align: center;
}

.app-store-badge {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 12px 24px;
    background: black;
    color: white;
    border-radius: 12px;
    text-decoration: none;
    margin-top: 40px;
    transition: transform 0.2s;
}

.app-store-badge:hover {
    transform: scale(1.05);
}

.apple-icon {
    width: 32px;
    height: 32px;
}

.badge-text-small {
    font-size: 12px;
    text-align: left;
}

.badge-text-large {
    font-size: 20px;
    font-weight: 600;
    text-align: left;
}

/* Footer */
.footer {
    background: var(--text-dark);
    color: white;
    padding: 60px 0 30px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    font-size: 20px;
}

.footer-links {
    display: flex;
    gap: 32px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    color: rgba(255, 255, 255, 0.5);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 30px;
}

/* Responsive */
@media (max-width: 768px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-image {
        display: flex;
        justify-content: center;
    }

    .hero-title {
        font-size: 36px;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .steps {
        flex-direction: column;
    }

    .step-arrow {
        transform: rotate(90deg);
    }

    .nav-links {
        display: none;
    }
}