:root {
    --bg-light: #fbfbfd;
    --bg-card: #ffffff;
    --text-main: #1d1d1f;
    --text-muted: #86868b;
    --accent: #0066cc;
    --accent-glow: rgba(0, 102, 204, 0.2);
    --border: rgba(0, 0, 0, 0.08);
    --glass: rgba(255, 255, 255, 0.72);
    --glass-border: rgba(0, 0, 0, 0.1);
}

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

body {
    background-color: var(--bg-light);
    color: var(--text-main);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.47059;
    font-weight: 400;
    letter-spacing: -0.022em;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1000px;
    /* Slimmer for that elegant Apple feel */
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Glass Navigation */
.glass-nav {
    position: fixed;
    top: 0;
    width: 100%;
    height: 52px;
    /* Apple standard */
    background: var(--glass);
    backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--glass-border);
    z-index: 9999;
}

.glass-nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.logo {
    font-size: 1.2rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    color: var(--text-main);
    text-decoration: none;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-main);
    opacity: 0.8;
    font-size: 0.8rem;
    font-weight: 400;
    transition: opacity 0.3s;
}

.nav-links a:hover,
.nav-links a.active {
    opacity: 1;
}

.cta-button-small {
    background: #000;
    color: white !important;
    padding: 0.4rem 1rem;
    border-radius: 980px;
    /* Pill shape */
    font-size: 0.75rem !important;
    opacity: 1 !important;
    font-weight: 500 !important;
}

/* Hero Section */
.hero {
    padding-top: 150px;
    padding-bottom: 80px;
    text-align: center;
}

.hero h1 {
    font-size: 4.5rem;
    font-weight: 700;
    letter-spacing: -0.015em;
    line-height: 1.05;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

.hero h2 {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.subhead {
    max-width: 700px;
    margin: 0 auto 2.5rem;
    font-size: 1.5rem;
    color: var(--text-main);
    opacity: 0.9;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 1.2rem;
    margin-bottom: 3rem;
}

.cta-button-large {
    background: var(--accent);
    color: white;
    text-decoration: none;
    padding: 1rem 2rem;
    border-radius: 980px;
    font-weight: 500;
    font-size: 1rem;
    transition: background 0.3s, transform 0.2s;
}

.cta-button-large:hover {
    background: #0077ed;
    transform: scale(1.02);
}

.cta-button-secondary {
    color: var(--accent);
    text-decoration: none;
    font-size: 1rem;
    font-weight: 400;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.cta-button-secondary:after {
    content: "〉";
    font-size: 0.8rem;
}

.cta-button-secondary:hover {
    text-decoration: underline;
}

.trust-line {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Page Content Base */
.page-content {
    padding-top: 100px;
}

/* Features Grid */
.features {
    padding: 80px 0;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.feature-card {
    background: var(--bg-card);
    padding: 2.5rem;
    border-radius: 24px;
    border: 1px solid var(--border);
    transition: box-shadow 0.4s ease;
    text-align: center;
}

.feature-card:hover {
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.05);
}

.feature-card .icon {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    display: block;
}

.feature-card h3 {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 0.8rem;
}

.feature-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Tiers Section */
.tiers {
    padding: 80px 0;
    background: #f5f5f7;
}

.section-title {
    text-align: center;
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 3rem;
}

.tier-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.tier-card {
    padding: 3rem;
    border-radius: 24px;
    background: white;
    border: 1px solid var(--border);
    transition: transform 0.3s;
}

.tier-card:hover {
    transform: scale(1.01);
}

.tier-card.archival {
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.04);
}

.tier-card h3 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    font-weight: 600;
}

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

/* Footer */
footer {
    padding: 60px 0;
    background: var(--bg-light);
    border-top: 1px solid var(--border);
    text-align: center;
}

.footer-logo {
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: 0.8rem;
}

.footer-tagline {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.4rem;
}

.footer-note {
    font-size: 0.75rem;
    color: #b0b0b5;
}

/* Tech / Common Page elements */
.section-intro {
    text-align: center;
    padding-bottom: 60px;
}

.section-intro h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.section-intro p {
    font-size: 1.5rem;
    color: var(--text-muted);
}

.flow-container {
    max-width: 800px;
    margin: 0 auto 5rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.flow-step {
    background: white;
    padding: 2rem;
    border-radius: 20px;
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 2rem;
}

.step-num {
    font-size: 2.5rem;
    font-weight: 700;
    color: #e8e8ed;
}

.flow-step h4 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.4rem;
}

.callout {
    background: #f5f5f7;
    padding: 2.5rem;
    border-radius: 24px;
    margin-bottom: 4rem;
    text-align: center;
    border: 1px solid var(--border);
}

/* Form Styles */
.form-card {
    background: white;
    padding: 3.5rem;
    border-radius: 32px;
    box-shadow: 0 30px 100px rgba(0, 0, 0, 0.06);
    border: 1px solid var(--border);
}

.form-group label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-main);
    margin-bottom: 0.5rem;
}

.form-group input,
.form-group select {
    background: #f5f5f7;
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: 12px;
    padding: 0.8rem;
    font-size: 1rem;
    color: var(--text-main);
    transition: border-color 0.2s;
}

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

/* Responsive */
@media (max-width: 768px) {

    .feature-grid,
    .tier-grid {
        grid-template-columns: 1fr;
    }

    .hero h1 {
        font-size: 2.8rem;
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .nav-links {
        display: none;
        /* Apple-style mobile nav usually hidden or hamburger */
    }
}