:root {
    --bg-color: #FBFBFD;
    --text-primary: #1D1D1F;
    --text-secondary: #86868B;
    --accent-color: #6E6E73;
    /* Graphite/Cool Gray */
    --button-bg: #1D1D1F;
    --button-text: #FFFFFF;
    --spacing-unit: 8px;
    --font-stack: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

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

body {
    font-family: var(--font-stack);
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.container {
    max-width: 680px;
    margin: 0 auto;
    padding: 80px 24px;
    flex: 1;
}

/* Typography */
h1,
h2,
h3 {
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

p {
    font-weight: 400;
    color: var(--text-secondary);
}

/* Hero */
.hero {
    text-align: center;
    margin-bottom: 60px;
}

.app-icon {
    margin-bottom: 24px;
    opacity: 0.9;
}

.app-name {
    font-size: 32px;
    margin-bottom: 8px;
}

.tagline {
    font-size: 20px;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.sub-tagline {
    font-size: 15px;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Fourth Option */
.fourth-option {
    text-align: center;
    margin-bottom: 80px;
}

.option-grid {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-bottom: 24px;
    font-size: 14px;
    font-weight: 500;
}

.option-item.muted {
    color: var(--text-secondary);
    opacity: 0.5;
    text-decoration: line-through;
}

.option-item.active {
    color: var(--text-primary);
    border-bottom: 2px solid var(--accent-color);
}

.option-text {
    font-size: 16px;
    color: var(--text-primary);
    line-height: 1.6;
}

/* Visual Proof */
.visual-proof {
    text-align: center;
    margin-bottom: 80px;
}

.screenshot-container {
    max-width: 480px;
    margin: 0 auto 16px;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
    /* Subtle shadow */
}

.app-screenshot {
    width: 100%;
    height: auto;
    display: block;
}

.proof-caption {
    font-size: 13px;
    color: var(--text-secondary);
}

/* How It Works */
.how-it-works {
    text-align: center;
    margin-bottom: 100px;
}

.steps {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 16px;
    margin-bottom: 12px;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-primary);
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #E5E5EA;
    color: var(--text-secondary);
    font-size: 11px;
    margin-right: 6px;
}

.step-divider {
    color: var(--text-secondary);
    opacity: 0.5;
}

.step-note {
    font-size: 13px;
    color: var(--text-secondary);
}

/* Features */
.features {
    margin-bottom: 100px;
}

.feature-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 48px;
}

@media (min-width: 600px) {
    .feature-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 24px;
    }
}

.feature-item h3 {
    font-size: 16px;
    margin-bottom: 8px;
}

.feature-item p {
    font-size: 14px;
    line-height: 1.4;
}

/* Trust */
.trust {
    text-align: center;
    margin-bottom: 80px;
    padding: 40px;
    background: #F5F5F7;
    border-radius: 12px;
}

.trust h2 {
    font-size: 20px;
    margin-bottom: 16px;
}

.trust p {
    font-size: 15px;
    margin-bottom: 16px;
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
}

.permission-note {
    font-size: 13px;
    color: var(--text-secondary);
    opacity: 0.8;
}

/* Download */
.download {
    text-align: center;
    margin-bottom: 80px;
}

.download-button {
    display: inline-block;
    background-color: var(--button-bg);
    color: var(--button-text);
    padding: 12px 32px;
    border-radius: 980px;
    /* Pill shape */
    text-decoration: none;
    font-weight: 500;
    font-size: 15px;
    transition: opacity 0.2s ease;
}

.download-button:hover {
    opacity: 0.9;
}

.requirements {
    margin-top: 16px;
    font-size: 13px;
}

/* Support */
.support {
    text-align: center;
    margin-bottom: 60px;
}

.support p {
    font-size: 14px;
    margin-bottom: 8px;
}

.support-link {
    font-size: 14px;
    color: var(--text-primary);
    text-decoration: underline;
    text-decoration-color: var(--text-secondary);
    text-underline-offset: 4px;
}

.support-link:hover {
    color: var(--text-secondary);
}

/* Footer */
footer {
    text-align: center;
    padding: 40px 0;
    border-top: 1px solid #E5E5EA;
    margin-top: auto;
}

.footer-links {
    margin-bottom: 16px;
    display: flex;
    justify-content: center;
    gap: 24px;
}

.footer-links a {
    font-size: 13px;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

footer p {
    font-size: 12px;
    color: var(--text-secondary);
    opacity: 0.8;
}