/* ========= Color System (logo-inspired) ========= */
:root {
    --bg: #1f1f1f;
    --bg-elev: #252525;
    --surface: #2e2e2e;
    --line: #1b3f4c;
    --text: #e7f6ff;
    --muted: #a7c8d6;

    --accent: #00bfff;  /* cyan from logo */
    --accent-2: #0094b8; /* teal */
    --accent-3: #016c8a; /* deep teal */
    --shadow: 0 10px 30px rgba(0, 191, 255, 0.12);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
    margin: 0;
    background: radial-gradient(1200px 600px at 20% 0%, rgba(0,191,255,.06), transparent) var(--bg);
    color: var(--text);
    font: 16px/1.6 "Inter", system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
}

/* ========= Navbar ========= */
.site-header { position: relative; background: linear-gradient(180deg, var(--surface), transparent 60%); }

.navbar {
    max-width: 1100px;
    margin: 0 auto;
    padding: 14px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text);
    font-weight: 700;
    letter-spacing: .3px;
}
.brand img { width: 36px; height: 36px; border-radius: 6px; }
.brand span { filter: drop-shadow(0 2px 8px rgba(0,191,255,.15)); }

.nav-toggle {
    appearance: none;
    border: 1px solid transparent;
    background: var(--surface);
    color: var(--text);
    border-radius: 10px;
    padding: 8px 10px;
    cursor: pointer;
    display: none;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 8px;
    margin: 0;
    padding: 0;
}
.nav-links a {
    --hover-bg: color-mix(in oklab, var(--accent-2) 18%, #000 82%);
    text-decoration: none;
    color: var(--text);
    padding: 10px 14px;
    border-radius: 10px;
    transition: background .25s, transform .15s, box-shadow .25s, color .25s;
    border: 1px solid transparent;
}
.nav-links a:hover {
    background: var(--hover-bg);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
    border-color: color-mix(in oklab, var(--accent-2) 45%, #000 55%);
}

/* ========= Hero ========= */
.hero {
    position: relative;
    padding: 72px 20px 48px;
    overflow: hidden;
}
.hero::before {
    /* subtelna „opaska” jak w logo */
    content: "";
    position: absolute;
    inset: -20% -30% auto -30%;
    height: 220px;
    transform: rotate(-6deg);
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    filter: blur(40px) saturate(1.1);
    opacity: .18;
    pointer-events: none;
}
.hero-inner {
    max-width: 1100px;
    margin: 0 auto;
    text-align: center;
}
.hero h1 {
    margin: 0 0 10px;
    font-size: clamp(34px, 5vw, 56px);
    letter-spacing: .2px;
}
.hero p {
    margin: 0 auto 22px;
    max-width: 700px;
    color: var(--muted);
    font-size: 18px;
}
.cta { display: inline-flex; gap: 12px; }

/* ========= Buttons ========= */
.btn {
    display: inline-block;
    padding: 12px 18px;
    border-radius: 12px;
    text-decoration: none;
    border: 1px solid transparent;
    transition: transform .15s, box-shadow .25s, background .25s, border-color .25s, color .25s;
    font-weight: 600;
}
.btn.primary {
    background: linear-gradient(180deg, var(--accent), var(--accent-2));
    color: #00161d;
    box-shadow: var(--shadow);
}
.btn.primary:hover { transform: translateY(-2px); }
.btn.ghost {
    background: transparent;
    color: var(--text);
    border-color: color-mix(in oklab, var(--accent-3) 50%, #000 50%);
}
.btn.ghost:hover {
    background: color-mix(in oklab, var(--accent-3) 18%, #000 82%);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}
.btn.small { padding: 10px 14px; font-size: 14px; }

/* ========= Sections & Cards ========= */
.section {
    max-width: 1100px;
    margin: 40px auto;
    padding: 0 20px;
}
.section h2 {
    font-size: clamp(24px, 3.6vw, 32px);
    margin: 0 0 16px;
    color: var(--text);
    border-left: 4px solid var(--accent);
    padding-left: 10px;
}
.grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
}
.card {
    background: linear-gradient(180deg, var(--surface), #242424);
    border: 1px solid color-mix(in oklab, var(--accent-3) 26%, #0a0a0a 74%);
    border-radius: 16px;
    padding: 18px;
    box-shadow: 0 1px 0 rgba(255,255,255,.03), 0 10px 30px rgba(0,0,0,.35);
    transition: transform .2s, box-shadow .25s, border-color .25s;
}
.card:hover {
    transform: translateY(-4px);
    border-color: color-mix(in oklab, var(--accent-2) 45%, #0a0a0a 55%);
    box-shadow: var(--shadow);
}
.card h3 { margin: 0 0 8px; font-size: 20px; }
.card p { margin: 0 0 14px; color: var(--muted); }

/* ========= Footer ========= */
.footer {
    margin-top: 60px;
    background: linear-gradient(0deg, #191919, #1b1b1b);
    border-top: 1px solid color-mix(in oklab, var(--accent-3) 25%, #000 75%);
}
.footer-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 28px 20px 40px;
    text-align: center;
}
.footer h3 { margin: 0 0 8px; }
.footer-nav {
    margin: 12px 0 8px;
    display: inline-flex;
    gap: 12px;
}
.footer-nav a {
    color: var(--text);
    text-decoration: none;
    padding: 8px 10px;
    border-radius: 10px;
    border: 1px solid transparent;
}
.footer-nav a:hover {
    background: color-mix(in oklab, var(--accent-2) 18%, #000 82%);
    border-color: color-mix(in oklab, var(--accent-2) 40%, #000 60%);
}
.small { color: var(--muted); }

/* ========= Accessibility & Misc ========= */
a:focus-visible, button:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    border-radius: 10px;
}

/* ========= Responsive ========= */
@media (max-width: 900px) {
    .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 720px) {
    .nav-toggle { display: inline-block; }
    .nav-links {
        position: absolute; right: 20px; top: 64px;
        background: var(--surface);
        padding: 10px;
        border: 1px solid color-mix(in oklab, var(--accent-3) 30%, #000 70%);
        border-radius: 12px;
        display: none;
        flex-direction: column;
        gap: 6px;
        box-shadow: var(--shadow);
    }
    .nav-links.open { display: flex; }
    .grid { grid-template-columns: 1fr; }
    .hero { padding: 56px 20px 36px; }
}