/* ── Reset & Base ── */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-text: #1a1a1a;
    --color-text-secondary: #555;
    --color-bg: #fafafa;
    --color-accent: #2a2a2a;
    --color-link: #0055cc;
    --color-link-hover: #003d99;
    --color-border: #e0e0e0;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --max-width: 640px;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
    min-height: 100vh;
}

/* ── Links ── */
a.link {
    color: var(--color-link);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s ease;
}
a.link:hover {
    border-bottom-color: var(--color-link);
}

/* ── Homepage ── */
.home {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 2rem;
    text-align: center;
    background: url('background.jpg') center / cover no-repeat fixed;
    position: relative;
}

.home::before {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
}

.home .container {
    max-width: var(--max-width);
    position: relative;
    z-index: 1;
}

.home h1 {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
    color: #fff;
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

.home-links {
    font-size: 0.95rem;
}

.home-links a.link {
    color: rgba(255, 255, 255, 0.9);
    border-bottom-color: rgba(255, 255, 255, 0.3);
}

.home-links a.link:hover {
    color: #fff;
    border-bottom-color: #fff;
}

.home-links .divider {
    margin: 0 0.75rem;
    color: rgba(255, 255, 255, 0.4);
}

/* ── Product Page (Ball Knower) ── */
.page {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 3rem 2rem;
}

.page-header {
    margin-bottom: 2.5rem;
}

.page-header a.back {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    margin-bottom: 1.5rem;
    transition: color 0.2s ease;
}
.page-header a.back:hover {
    color: var(--color-text);
}

.page-header h1 {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    color: var(--color-accent);
    margin-bottom: 0.5rem;
}

.page-header .tagline {
    font-size: 1.05rem;
    color: var(--color-text-secondary);
}

.section {
    margin-bottom: 2rem;
}

.section h2 {
    font-size: 1.1rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-secondary);
    margin-bottom: 0.75rem;
}

.section p {
    color: var(--color-text);
    line-height: 1.7;
}

.section ul {
    list-style: none;
    padding: 0;
}

.section ul li {
    padding: 0.35rem 0;
    color: var(--color-text);
}

.section ul li::before {
    content: "—";
    margin-right: 0.5rem;
    color: var(--color-border);
}

.page-footer {
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--color-border);
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

.page-footer a.link {
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

/* ── Privacy Policy ── */
.policy p {
    margin-bottom: 1rem;
}

.policy h2 {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--color-accent);
    margin-top: 2rem;
    margin-bottom: 0.5rem;
    text-transform: none;
    letter-spacing: normal;
}

.policy ul {
    margin-bottom: 1rem;
    padding-left: 1.25rem;
}

.policy ul li {
    padding: 0.2rem 0;
}

.policy ul li::before {
    content: none;
}

.policy ul {
    list-style: disc;
}

/* ── Responsive ── */
@media (max-width: 480px) {
    .home h1 {
        font-size: 1.5rem;
    }
    .page-header h1 {
        font-size: 1.6rem;
    }
    .home-links .divider {
        display: block;
        margin: 0.25rem 0;
        visibility: hidden;
    }
    .footer-links {
        flex-direction: column;
        gap: 0.5rem;
    }
}