:root {
    --bg: #0f1115;
    --surface: #161a22;
    --surface-2: #1f2531;
    --text: #e8ebf1;
    --text-muted: #99a1b3;
    --accent: #4f8cff;
    --accent-hover: #6ea1ff;
    --border: #262c38;
    --error: #ff6b6b;
    --success: #4ec27a;
    --max-width: 1100px;
    --radius: 8px;
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--text);
    font-family: var(--font);
    font-size: 16px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }

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

h1, h2, h3 {
    line-height: 1.2;
    margin: 0 0 0.5em;
    font-weight: 600;
}
h1 { font-size: 2.25rem; }
h2 { font-size: 1.6rem; }
h3 { font-size: 1.2rem; }

p { margin: 0 0 1em; }

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.25rem;
}

.lead { font-size: 1.15rem; color: var(--text-muted); }
.muted { color: var(--text-muted); }

.sr-only {
    position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden;
    clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* Header / Nav */
.site-header {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    position: sticky; top: 0; z-index: 10;
}
.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}
.brand img { height: 36px; }
.primary-nav { display: flex; gap: 1.5rem; }
.primary-nav a { color: var(--text); }
.primary-nav a:hover { color: var(--accent); text-decoration: none; }
.nav-toggle {
    display: none;
    align-items: center; justify-content: center;
    width: 44px; height: 44px;
    background: transparent; color: var(--text);
    border: 1px solid var(--border); border-radius: var(--radius);
    padding: 0; cursor: pointer;
}
.nav-toggle-icon,
.nav-toggle-icon::before,
.nav-toggle-icon::after {
    display: block;
    width: 22px; height: 2px;
    background: currentColor;
    border-radius: 2px;
    transition: transform 0.18s ease, opacity 0.18s ease, top 0.18s ease;
}
.nav-toggle-icon { position: relative; }
.nav-toggle-icon::before,
.nav-toggle-icon::after {
    content: "";
    position: absolute; left: 0;
}
.nav-toggle-icon::before { top: -7px; }
.nav-toggle-icon::after  { top:  7px; }
.nav-toggle.is-open .nav-toggle-icon { background: transparent; }
.nav-toggle.is-open .nav-toggle-icon::before { top: 0; transform: rotate(45deg); }
.nav-toggle.is-open .nav-toggle-icon::after  { top: 0; transform: rotate(-45deg); }

.mobile-nav {
    display: none;
    flex-direction: column;
    background: var(--surface-2);
    border-top: 1px solid var(--border);
    padding: 0.25rem 1.25rem;
}
.mobile-nav a {
    display: block;
    padding: 0.9rem 0;
    min-height: 44px;
    color: var(--text);
    border-bottom: 1px solid var(--border);
}
.mobile-nav a:last-child { border-bottom: none; }

@media (max-width: 768px) {
    .primary-nav { display: none; }
    .nav-toggle { display: inline-flex; }
    .mobile-nav.is-open { display: flex; }
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.7rem 1.25rem;
    border-radius: var(--radius);
    font-weight: 600;
    cursor: pointer;
    border: 1px solid transparent;
    transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
    text-decoration: none;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); color: #fff; text-decoration: none; }
.btn-secondary {
    background: transparent; color: var(--text); border-color: var(--border);
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }

/* Hero */
.hero {
    min-height: 70vh;
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
}
.hero-overlay {
    background: linear-gradient(180deg, rgba(15,17,21,0.55), rgba(15,17,21,0.85));
    width: 100%;
    padding: 5rem 0;
}
.hero-content h1 { font-size: 3rem; margin-bottom: 0.5rem; }
.hero-content .lead { font-size: 1.35rem; max-width: 640px; margin-bottom: 1.5rem; color: #d8dde8; }

/* Page banner */
.page-banner {
    background-size: cover;
    background-position: center;
}
.page-banner-overlay {
    background: linear-gradient(180deg, rgba(15,17,21,0.55), rgba(15,17,21,0.85));
    padding: 4rem 0;
}
.page-banner h1 { font-size: 2.5rem; margin-bottom: 0.5rem; }

/* Content sections */
.content { padding: 3rem 1.25rem; }
.content-narrow { max-width: 720px; }

/* Product feature rows */
.product-feature { padding: 3.5rem 1.25rem; }
.product-feature-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
    align-items: center;
}
.product-feature-row.reverse .product-feature-image { order: 2; }
.product-feature-image img {
    border-radius: var(--radius);
    box-shadow: 0 10px 30px rgba(0,0,0,0.4);
}
.product-feature-image--phone {
    display: flex;
    justify-content: center;
}
.product-feature-image--phone img {
    max-width: 320px;
    width: 100%;
    border-radius: 0;
    box-shadow: none;
}
.product-feature-text h2 { font-size: 2rem; }
.product-feature.alt { background: var(--surface); }
.product-feature-text h3 {
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin: 1.25rem 0 0.5rem;
}
.feature-list {
    list-style: none;
    padding: 0;
    margin: 0 0 1rem;
}
.feature-list li {
    position: relative;
    padding: 0.25rem 0 0.25rem 1.5rem;
}
.feature-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.7rem;
    width: 8px; height: 8px;
    border-radius: 2px;
    background: var(--accent);
}

@media (max-width: 768px) {
    .product-feature-row { grid-template-columns: 1fr; }
    .product-feature-row.reverse .product-feature-image { order: 0; }
    .hero-content h1 { font-size: 2.25rem; }
    .hero-content .lead { font-size: 1.1rem; }
}

/* Person block */
.person {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 2rem;
    align-items: start;
}
.person-photo {
    width: 200px; height: 200px;
    border-radius: 50%; object-fit: cover;
    box-shadow: 0 10px 30px rgba(0,0,0,0.4);
}
@media (max-width: 768px) {
    .person { grid-template-columns: 1fr; }
    .person-photo { margin: 0 auto; }
}

/* CTA */
.cta {
    background: var(--surface);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    padding: 2.5rem 1.25rem;
}
.cta-inner {
    display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 1rem;
}
.cta p { margin: 0; font-size: 1.1rem; }

/* Contact form */
.contact-form { margin-top: 1.5rem; }
.form-group { margin-bottom: 1.25rem; }
.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.4rem;
}
.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.7rem 0.9rem;
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font: inherit;
}
.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(79, 140, 255, 0.25);
}
.field-error { display: block; color: var(--error); font-size: 0.9rem; margin-top: 0.3rem; }

.alert {
    padding: 0.85rem 1rem;
    border-radius: var(--radius);
    margin-bottom: 1.25rem;
    border: 1px solid var(--border);
}
.alert-success { background: rgba(78, 194, 122, 0.08); border-color: var(--success); color: var(--success); }
.alert-error { background: rgba(255, 107, 107, 0.08); border-color: var(--error); color: var(--error); }
.alert-error:empty { display: none; }

/* Footer */
.site-footer {
    background: var(--surface);
    border-top: 1px solid var(--border);
    margin-top: 3rem;
    padding-top: 2.5rem;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 2rem;
    padding-bottom: 2rem;
}
.footer-grid h2 {
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
}
.footer-grid ul { list-style: none; padding: 0; margin: 0; }
.footer-grid li { padding: 0.2rem 0; }
.footer-logo { height: 40px; margin-bottom: 1rem; }
.site-footer .social a { color: var(--text-muted); }
.copyright {
    border-top: 1px solid var(--border);
    padding: 1.25rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}
@media (max-width: 768px) {
    .footer-grid { grid-template-columns: 1fr; }
}