:root {
    --bg: #0f172a;
    --bg2: #0b1220;
    --fg: #e5e7eb;
    --muted: #94a3b8;
    --brand: #22d3ee;
    --accent: #38bdf8;
    --card: #111827;
    --border: rgba(148, 163, 184, .15);
    --max: 1080px;
}

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

html,
body {
    background: linear-gradient(180deg, var(--bg2), var(--bg) 40%, var(--bg2));
    color: var(--fg);
    font: 16px/1.6 system-ui, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
}

/* links */
a {
    color: var(--accent);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* general containers */
.container {
    max-width: var(--max);
    margin: 0 auto;
    padding: 0 16px;
}

/* header */
header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(15, 23, 42, .7);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 0;
}

/* branding */
.brand {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: radial-gradient(circle at 30% 30%, var(--brand), transparent 60%), #0ea5e9;
    box-shadow: 0 0 24px rgba(56, 189, 248, .35);
}

.brand h1 {
    font-size: 20px;
    margin: 0;
}

/* menu */
.menu {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    font-size: 15px;
}

/* pill */
.pill {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 999px;
    font-size: 12px;
    color: var(--muted);
    border: 1px solid rgba(255, 255, 255, .15);
}

/* button */
.btn {
    display: inline-block;
    padding: 10px 16px;
    background: var(--accent);
    color: #0b1220 !important;
    border-radius: 12px;
    font-weight: 600;
    border: 1px solid rgba(255, 255, 255, .16);
}

.btn:hover {
    filter: brightness(1.1);
    text-decoration: none;
}

/* hero */
.hero {
    padding: 70px 0;
}

.hero h2 {
    font-size: clamp(26px, 4.8vw, 44px);
    margin: 10px 0 14px;
    line-height: 1.15;
}

.hero p {
    color: var(--muted);
    max-width: 740px;
    margin-bottom: 18px;
}

.hero .cta {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

/* sections */
section {
    padding: 50px 0;
    border-top: 1px solid var(--border);
}

/* cards */
.card {
    background: var(--card);
    border: 1px solid var(--border);
    padding: 20px;
    border-radius: 16px;
}

.card p {
    color: var(--muted);
}

/* grids */
.grid {
    display: grid;
    gap: 18px;
}

@media (min-width:768px) {
    .grid.cols-2 {
        grid-template-columns: repeat(2, 1fr);
    }

    .grid.cols-3 {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* kicker */
.kicker {
    color: var(--brand);
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .08em;
}

/* footer */
footer {
    padding: 30px 0;
    border-top: 1px solid var(--border);
    color: var(--muted);
    text-align: center;
}

footer a {
    color: var(--accent);
}

/* contact special */
.contact {
    display: grid;
    gap: 20px;
}

@media(min-width:768px) {
    .contact {
        grid-template-columns: 2fr 1fr;
    }
}

.note {
    color: var(--muted);
    margin-top: 8px;
    font-size: 14px;
}

/* full width single-column grid for dost siteler (12/12) */
.grid.cols-1 {
    grid-template-columns: 1fr;
}