/* Design tokens — tune the whole palette here */
:root {
    --bg-page: #fbfbf8;                     /* warm off-white page ground */
    --bg-tint: rgba(236, 239, 231, .45);    /* warm section tint */
    --bg-card: #ffffff;                     /* cards stay pure white */
    --ink: #1a1a1a;
    --accent: #0066ff;
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    line-height: 1.6;
    color: var(--ink);
    background-color: var(--bg-page);
}

/* Navigation */
header {
    padding: 1.5rem 4rem;
    border-bottom: 1px solid #eaeaea;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 0.05em;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

nav ul li a {
    text-decoration: none;
    color: #1a1a1a;
    font-weight: 500;
    transition: color 0.3s;
}

nav ul li a:hover {
    color: #0066ff;
}

.btn-primary {
    background-color: #0066ff;
    color: white !important;
    padding: 0.6rem 1.5rem;
    border-radius: 6px;
    font-weight: 600;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 4rem 2rem;
    background: linear-gradient(to bottom, var(--bg-tint), var(--bg-page));
}

.hero h1 {
    font-size: 3rem;
    font-weight: 800;
    max-width: 800px;
    margin: 0 auto;
}

/* Product Cards */
.product-card {
    max-width: 800px;
    margin: 3rem auto;
    padding: 3rem;
    background: var(--bg-card);
    border-radius: 16px;
    box-shadow: 0 4px 24px rgba(0,0,0,0.06);
    border: 1px solid #f0f0f0;
}

.product-card h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.product-card h3 {
    font-weight: 400;
    font-size: 1.1rem;
    color: #4a4a4a;
    margin-bottom: 1.5rem;
}

.btn-secondary {
    display: inline-block;
    background-color: transparent;
    color: #0066ff;
    text-decoration: none;
    font-weight: 600;
    padding: 0.5rem 1rem;
    border: 2px solid #0066ff;
    border-radius: 6px;
    transition: all 0.3s;
}

.btn-secondary:hover {
    background-color: #0066ff;
    color: white;
}

/* Use Cases */
#use-cases {
    max-width: 1200px;
    margin: 4rem auto;
    padding: 0 2rem;
}

#use-cases > h2 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 1rem;
}

#use-cases > p {
    text-align: center;
    color: #666;
    margin-bottom: 3rem;
}

.use-case {
    background: var(--bg-tint);
    padding: 2.5rem;
    border-radius: 16px;
    margin-bottom: 2rem;
    border-left: 4px solid var(--accent);
}

.use-case h3 {
    font-size: 1.75rem;
    margin-bottom: 1rem;
}

.use-case ul {
    list-style: disc;
    padding-left: 1.5rem;
    margin: 1rem 0;
}

.use-case li {
    margin-bottom: 0.5rem;
}

.investor-stats {
    background: var(--bg-card);
    padding: 1.5rem;
    border-radius: 8px;
    margin-top: 1.5rem;
}

/* Stages Section */
#stages {
    max-width: 1200px;
    margin: 4rem auto;
    padding: 0 2rem;
    text-align: center;
}

.stages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.stage {
    background: var(--bg-tint);
    padding: 2rem 1rem;
    border-radius: 12px;
    font-weight: 700;
    font-size: 1.1rem;
}

.stage small {
    display: block;
    font-weight: 400;
    font-size: 0.85rem;
    color: #666;
    margin-top: 0.5rem;
}

/* FAQ Section */
#faq {
    max-width: 900px;
    margin: 4rem auto;
    padding: 0 2rem;
}

#faq h2 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 2rem;
}

.faq-item {
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid #eaeaea;
}

.faq-item h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: #1a1a1a;
}

.faq-item p {
    color: #4a4a4a;
}

.faq-links {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 2rem;
}

.faq-links a {
    color: #0066ff;
    text-decoration: none;
    font-weight: 500;
}

.faq-links a:hover {
    text-decoration: underline;
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem;
    border-top: 1px solid #eaeaea;
    color: #888;
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    header {
        padding: 1rem;
    }

    nav {
        flex-direction: column;
        gap: 1rem;
    }

    nav ul {
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .product-card {
        padding: 1.5rem;
        margin: 1.5rem 1rem;
    }

    .product-card h2 {
        font-size: 2rem;
    }

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