:root {
    --bg-primary:   #0d1117;
    --bg-card:      #161b22;
    --border:       #30363d;
    --text-primary: #e6edf3;
    --text-muted:   #8b949e;
    --accent:       #2f81f7;
    --accent-dim:   #1a5fb4;
    --success:      #3fb950;
    --error:        #f85149;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ------------------------------------------------------------------ */
/* Navigation                                                          */
/* ------------------------------------------------------------------ */
nav {
    border-bottom: 1px solid var(--border);
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.02em;
}

.nav-brand span { color: var(--accent); }

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

nav ul a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s;
}

nav ul a:hover,
nav ul a.active { color: var(--text-primary); }

/* ------------------------------------------------------------------ */
/* Main content                                                        */
/* ------------------------------------------------------------------ */
main { flex: 1; }

/* ------------------------------------------------------------------ */
/* Hero                                                                */
/* ------------------------------------------------------------------ */
.hero {
    text-align: center;
    padding: 5rem 2rem 4rem;
    max-width: 860px;
    margin: 0 auto;
}

.badge {
    display: inline-block;
    background: rgba(47, 129, 247, 0.12);
    border: 1px solid rgba(47, 129, 247, 0.3);
    color: var(--accent);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    padding: 0.3rem 0.9rem;
    border-radius: 2rem;
    margin-bottom: 1.5rem;
}

.hero h1 {
    font-size: clamp(2rem, 5vw, 3.25rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.15;
    margin-bottom: 1.25rem;
}

.hero h1 span { color: var(--accent); }

.hero p {
    font-size: 1.15rem;
    color: var(--text-muted);
    max-width: 640px;
    margin: 0 auto 2.5rem;
}

/* ------------------------------------------------------------------ */
/* Notify form                                                         */
/* ------------------------------------------------------------------ */
.notify-form {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

.notify-form input[type="email"] {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 0.95rem;
    padding: 0.65rem 1rem;
    width: 280px;
    outline: none;
    transition: border-color 0.2s;
}

.notify-form input[type="email"]:focus {
    border-color: var(--accent);
}

.btn {
    background: var(--accent);
    border: none;
    border-radius: 6px;
    color: #fff;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    padding: 0.65rem 1.4rem;
    text-decoration: none;
    display: inline-block;
    transition: background 0.2s;
}

.btn:hover { background: var(--accent-dim); }

.btn-outline {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-muted);
}

.btn-outline:hover {
    background: var(--bg-card);
    color: var(--text-primary);
}

/* ------------------------------------------------------------------ */
/* Products grid                                                       */
/* ------------------------------------------------------------------ */
.products {
    padding: 3rem 2rem 5rem;
    max-width: 1000px;
    margin: 0 auto;
}

.products h2 {
    text-align: center;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-muted);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    margin-bottom: 2.5rem;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
}

.product-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
    transition: border-color 0.2s;
}

.product-card:hover { border-color: var(--accent); }

.product-icon {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
}

.product-card h3 {
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 0.4rem;
}

.product-card p {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* ------------------------------------------------------------------ */
/* Page content (about, contact)                                       */
/* ------------------------------------------------------------------ */
.page-content {
    max-width: 720px;
    margin: 0 auto;
    padding: 4rem 2rem;
}

.page-content h1 {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 0.5rem;
}

.page-content .subtitle {
    color: var(--text-muted);
    margin-bottom: 2.5rem;
}

.page-content h2 {
    font-size: 1.1rem;
    font-weight: 700;
    margin: 2rem 0 0.75rem;
    color: var(--text-primary);
}

.page-content p {
    color: var(--text-muted);
    margin-bottom: 1rem;
}

/* ------------------------------------------------------------------ */
/* Contact form                                                        */
/* ------------------------------------------------------------------ */
.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 0.4rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 0.95rem;
    padding: 0.65rem 1rem;
    outline: none;
    transition: border-color 0.2s;
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus { border-color: var(--accent); }

.form-group textarea { resize: vertical; min-height: 120px; }

/* ------------------------------------------------------------------ */
/* Flash messages                                                      */
/* ------------------------------------------------------------------ */
.flash-list { list-style: none; margin-bottom: 1.5rem; }

.flash {
    padding: 0.75rem 1rem;
    border-radius: 6px;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.flash.success {
    background: rgba(63, 185, 80, 0.1);
    border: 1px solid rgba(63, 185, 80, 0.3);
    color: var(--success);
}

.flash.error {
    background: rgba(248, 81, 73, 0.1);
    border: 1px solid rgba(248, 81, 73, 0.3);
    color: var(--error);
}

/* ------------------------------------------------------------------ */
/* Footer                                                              */
/* ------------------------------------------------------------------ */
footer {
    border-top: 1px solid var(--border);
    padding: 1.5rem 2rem;
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-muted);
}

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

/* ------------------------------------------------------------------ */
/* Responsive                                                          */
/* ------------------------------------------------------------------ */
@media (max-width: 600px) {
    nav ul { gap: 1.25rem; }
    .notify-form input[type="email"] { width: 100%; }
    .notify-form { flex-direction: column; align-items: center; }
}