/* Reset and base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --color-bg: #fafafa;
    --color-text: #1a1a1a;
    --color-text-muted: #666;
    --color-accent: #1e3a5f;
    --color-accent-hover: #2d4a6f;
    --color-border: #e0e0e0;
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

main {
    max-width: 680px;
    margin: 0 auto;
    padding: 4rem 1.5rem;
}

/* Hero */
.hero {
    margin-bottom: 3rem;
    text-align: center;
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: 0.5rem;
    color: var(--color-text);
}

.tagline {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    font-weight: 400;
}

/* Intro */
.intro {
    margin-bottom: 3rem;
    text-align: center;
}

.intro p {
    font-size: 1.125rem;
    color: var(--color-text);
    max-width: 560px;
    margin: 0 auto;
}

/* Signup */
.signup {
    background: white;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 2rem;
    margin-bottom: 3rem;
    text-align: center;
}

.signup h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.signup > p {
    color: var(--color-text-muted);
    margin-bottom: 1.5rem;
    font-size: 0.9375rem;
}

.signup-form {
    display: flex;
    gap: 0.75rem;
    max-width: 420px;
    margin: 0 auto;
}

.signup-form input[type="email"] {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-size: 1rem;
    font-family: inherit;
    background: var(--color-bg);
    transition: border-color 0.15s ease;
}

.signup-form input[type="email"]:focus {
    outline: none;
    border-color: var(--color-accent);
}

.signup-form button {
    padding: 0.75rem 1.5rem;
    background: var(--color-accent);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: background-color 0.15s ease;
}

.signup-form button:hover {
    background: var(--color-accent-hover);
}

.form-note {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    margin-top: 1rem;
}

/* Coverage */
.coverage {
    margin-bottom: 3rem;
}

.coverage h2 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
}

.topics {
    list-style: none;
}

.topics li {
    padding: 1rem 0;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.topics li:last-child {
    border-bottom: none;
}

.topics li strong {
    font-weight: 600;
    color: var(--color-text);
}

.topics li span {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
}

/* Independence */
.independence {
    background: var(--color-accent);
    color: white;
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 3rem;
}

.independence p {
    font-size: 0.9375rem;
    line-height: 1.7;
}

.independence strong {
    display: block;
    margin-bottom: 0.25rem;
}

/* Footer */
footer {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
}

.contact {
    margin-bottom: 1rem;
    font-size: 0.9375rem;
}

.contact a {
    color: var(--color-accent);
    text-decoration: none;
}

.contact a:hover {
    text-decoration: underline;
}

.copyright {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

/* Responsive */
@media (max-width: 600px) {
    main {
        padding: 2.5rem 1.25rem;
    }

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

    .signup-form {
        flex-direction: column;
    }

    .signup-form button {
        width: 100%;
    }
}