:root {
    --bg-color: #ffffff;
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --accent: #4361EE;
    --accent-soft: #f0f4ff;
    --border-color: #eeeeee;
    --container-width: 1100px;
    --section-padding: 100px 0;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    color: var(--text-primary);
    background-color: var(--bg-color);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 30px;
}

/* Typography */
h1 {
    font-size: 4rem;
    font-weight: 600;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -0.03em;
}

h2 {
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 20px;
    letter-spacing: -0.02em;
}

h3 {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 12px;
}

p {
    font-size: 1.15rem;
    color: var(--text-secondary);
}

.section-tag {
    text-transform: uppercase;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    color: var(--accent);
    margin-bottom: 16px;
}

/* Navigation */
nav {
    padding: 30px 0;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    z-index: 100;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: -0.02em;
}

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

.nav-links {
    list-style: none;
    display: flex;
    align-items: center;
    gap: 40px;
}

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

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

/* Buttons */
.btn {
    display: inline-block;
    padding: 16px 32px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.2s;
    cursor: pointer;
    border: none;
    font-size: 1rem;
}

.btn-small {
    padding: 10px 20px;
    font-size: 0.9rem;
}

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

.btn-primary:hover {
    background-color: #333;
    transform: translateY(-2px);
}

/* Hero Section */
.hero {
    padding: 120px 0;
}

.hero-subtext {
    max-width: 600px;
    font-size: 1.4rem;
    margin-bottom: 40px;
}

/* Mission Section */
.mission {
    padding: var(--section-padding);
    background-color: var(--accent-soft);
}

.mission h2 {
    max-width: 500px;
}

.mission p {
    max-width: 700px;
}

/* App Showcase */
.apps-showcase {
    padding: var(--section-padding);
}

.app-card {
    margin-top: 60px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    background: #fdfdfd;
    border: 1px solid var(--border-color);
    padding: 60px;
    border-radius: 32px;
}

.app-badge {
    display: inline-block;
    padding: 4px 12px;
    background: var(--accent-soft);
    color: var(--accent);
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.app-features {
    margin-top: 24px;
    list-style: none;
}

.app-features li {
    position: relative;
    padding-left: 24px;
    margin-bottom: 10px;
    color: var(--text-secondary);
}

.app-features li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--accent);
}

.app-visual {
    background: #f0f0f0;
    height: 300px;
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
}

.placeholder-ui {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.ui-bar {
    height: 30px;
    background: #e0e0e0;
    border-radius: 6px;
}

/* CTA Section */
.cta-section {
    padding: var(--section-padding);
}

.cta-card {
    background: var(--text-primary);
    color: white;
    padding: 80px;
    border-radius: 32px;
    text-align: center;
}

.cta-card h2 {
    color: white;
}

.cta-card p {
    color: #999;
    margin-bottom: 40px;
}

.signup-form {
    display: flex;
    max-width: 500px;
    margin: 0 auto;
    gap: 12px;
}

.signup-form input {
    flex: 1;
    padding: 16px 20px;
    border-radius: 12px;
    border: none;
    font-size: 1rem;
}

/* Footer */
footer {
    padding: 60px 0;
    border-top: 1px solid var(--border-color);
}

.footer-grid {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-brand p {
    font-size: 0.9rem;
    margin-top: 8px;
}

@media (max-width: 768px) {
    h1 { font-size: 2.8rem; }
    .nav-links { display: none; }
    .app-card {
        grid-template-columns: 1fr;
        padding: 30px;
    }
    .hero { padding: 60px 0; }
    .signup-form { flex-direction: column; }
    .cta-card { padding: 40px 20px; }
}