/* SternaWatch — Landing page styles. Mobile-first. */

:root {
    --color-primary: #0066cc;
    --color-primary-dark: #0052a3;
    --color-accent: #5dade2;
    --color-bg: #ffffff;
    --color-bg-alt: #f5f7fa;
    --color-text: #1a1a1a;
    --color-text-muted: #555;
    --color-border: #e0e0e0;
    --space-xs: 0.5rem;
    --space-sm: 0.75rem;
    --space: 1rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --radius: 8px;
    --radius-lg: 12px;
    --max-width: 1100px;
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: var(--font);
    color: var(--color-text);
    line-height: 1.6;
    background: var(--color-bg);
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space);
}

@media (min-width: 768px) {
    .container { padding: 0 var(--space-lg); }
}

a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3 { line-height: 1.25; margin: 0 0 var(--space-sm); }
h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; text-align: center; margin-bottom: var(--space-lg); }
h3 { font-size: 1.15rem; }

@media (min-width: 768px) {
    h1 { font-size: 2.75rem; }
    h2 { font-size: 2rem; }
}

.section {
    padding: var(--space-xl) 0;
}
.section-alt { background: var(--color-bg-alt); }

/* ─── Buttons ─── */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    font-weight: 600;
    text-decoration: none;
    transition: all 0.15s;
    border: 2px solid transparent;
    cursor: pointer;
    font-family: inherit;
    font-size: 1rem;
}
.btn-primary {
    background: var(--color-primary);
    color: white;
}
.btn-primary:hover { background: var(--color-primary-dark); text-decoration: none; }
.btn-secondary {
    background: white;
    color: var(--color-primary);
    border-color: var(--color-primary);
}
.btn-secondary:hover { background: var(--color-bg-alt); text-decoration: none; }

/* ─── Header ─── */
.site-header {
    border-bottom: 1px solid var(--color-border);
    background: white;
    position: sticky;
    top: 0;
    z-index: 100;
}
.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space) var(--space);
}
.brand {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
}
.site-header nav {
    display: flex;
    gap: var(--space);
    align-items: center;
}
.site-header nav a:not(.btn) {
    display: none;
}
@media (min-width: 768px) {
    .site-header nav {
        gap: var(--space-lg);
    }
    .site-header nav a:not(.btn) {
        display: inline;
    }
}

/* ─── Hero ─── */
.hero {
    padding: var(--space-xl) 0;
    background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-bg-alt) 100%);
}
.hero-inner {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
    align-items: center;
}
@media (min-width: 768px) {
    .hero-inner { flex-direction: row; }
    .hero-text { flex: 0.6; }
    .hero-image { flex: 0.4; }
}
.lead {
    font-size: 1.15rem;
    color: var(--color-text-muted);
    margin: var(--space) 0 var(--space-lg);
}
.cta-row {
    display: flex;
    gap: var(--space);
    flex-wrap: wrap;
}
.image-placeholder, .video-placeholder {
    background: var(--color-bg-alt);
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    aspect-ratio: 4/3;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
    font-size: 1.5rem;
}

/* ─── Grid 3 columns ─── */
.grid-3 {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
}
@media (min-width: 768px) {
    .grid-3 { grid-template-columns: repeat(3, 1fr); }
}

.card, .step {
    background: white;
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    text-align: center;
}
.icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-sm);
}
.step { position: relative; }
.step-num {
    position: absolute;
    top: var(--space);
    right: var(--space);
    width: 32px;
    height: 32px;
    background: var(--color-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 0.9rem;
}

.video-wrap {
    margin-top: var(--space-xl);
}

/* ─── Pricing ─── */
.pricing-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
    max-width: 700px;
    margin: 0 auto;
}
@media (min-width: 768px) {
    .pricing-grid { grid-template-columns: 1fr 1fr; }
}
.price-card {
    background: white;
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    border: 2px solid var(--color-border);
    text-align: center;
}
.price-card-premium {
    border-color: var(--color-primary);
}
.price {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--color-primary);
    margin: var(--space) 0;
}
.price-suffix {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    font-weight: normal;
}
.price-card ul {
    list-style: none;
    padding: 0;
    margin: var(--space-lg) 0;
    text-align: left;
}
.price-card ul li {
    padding: 0.4rem 0;
    border-bottom: 1px solid var(--color-bg-alt);
}
.price-card ul li::before {
    content: "✓ ";
    color: var(--color-primary);
    font-weight: bold;
}
.pricing-note {
    text-align: center;
    margin-top: var(--space-lg);
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

/* ─── FAQ ─── */
details {
    border-bottom: 1px solid var(--color-border);
    padding: var(--space) 0;
}
details summary {
    font-weight: 600;
    cursor: pointer;
    list-style: none;
    padding-right: 2rem;
    position: relative;
}
details summary::after {
    content: "+";
    position: absolute;
    right: 0;
    top: 0;
    font-size: 1.5rem;
    color: var(--color-primary);
}
details[open] summary::after { content: "−"; }
details p { margin-top: var(--space-sm); color: var(--color-text-muted); }

/* ─── Signup form ─── */
.signup {
    background: var(--color-primary);
    color: white;
}
.signup h2 { color: white; }
.signup .lead { color: rgba(255,255,255,0.9); }
#waitlist-form {
    max-width: 500px;
    margin: 0 auto;
    background: white;
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    color: var(--color-text);
}
#waitlist-form label {
    display: block;
    margin-bottom: var(--space);
    font-weight: 600;
}
#waitlist-form input,
#waitlist-form select {
    display: block;
    width: 100%;
    padding: 0.6rem;
    margin-top: 0.3rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 1rem;
    font-family: inherit;
}
#waitlist-form button {
    width: 100%;
    margin-top: var(--space);
}
.success-msg {
    text-align: center;
    background: #2e7d32;
    color: white;
    padding: var(--space);
    border-radius: var(--radius);
    margin-top: var(--space);
}

/* ─── Footer ─── */
.site-footer {
    background: #1a1a1a;
    color: #ccc;
    padding: var(--space-xl) 0;
    font-size: 0.9rem;
}
.footer-inner {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
    align-items: center;
    text-align: center;
}
.site-footer a { color: white; }
.footer-inner nav {
    display: flex;
    gap: var(--space);
    flex-wrap: wrap;
    justify-content: center;
}
.footer-copy {
    color: #888;
    font-size: 0.85rem;
}
@media (min-width: 768px) {
    .footer-inner {
        flex-direction: row;
        justify-content: space-between;
        text-align: left;
    }
}