/* Virethi Tech — base stylesheet */

:root {
    --bg: #ffffff;
    --fg: #14161a;
    --muted: #5b6270;
    --accent: #2f6df6;
    --border: #e3e6eb;
    --card: #f7f8fa;
    --maxw: 68rem;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0f1115;
        --fg: #e8eaed;
        --muted: #9aa2b1;
        --accent: #6b9bff;
        --border: #262a33;
        --card: #171a21;
    }
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--fg);
    font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    -webkit-text-size-adjust: 100%;
}

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

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

/* Layout ------------------------------------------------------------- */

.container,
.site-header,
.site-footer {
    max-width: var(--maxw);
    margin-inline: auto;
    padding-inline: 1.25rem;
}

.site-header {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: center;
    justify-content: space-between;
    padding-block: 1.25rem;
    border-bottom: 1px solid var(--border);
}

.brand {
    font-weight: 700;
    font-size: 1.15rem;
    text-decoration: none;
    color: var(--fg);
}

.site-header nav {
    display: flex;
    gap: 1.25rem;
}

.site-header nav a {
    text-decoration: none;
}

.site-header nav a:hover {
    text-decoration: underline;
}

.site-footer {
    margin-top: 4rem;
    padding-block: 2rem;
    border-top: 1px solid var(--border);
    color: var(--muted);
    font-size: 0.9rem;
}

/* Sections ----------------------------------------------------------- */

section {
    padding-block: 3rem;
}

.hero {
    padding-block: 5rem 3rem;
}

.hero h1 {
    margin: 0 0 0.5rem;
    font-size: clamp(2rem, 6vw, 3.25rem);
    line-height: 1.15;
    letter-spacing: -0.02em;
}

.lead {
    margin: 0 0 1.5rem;
    font-size: 1.2rem;
    color: var(--muted);
}

h2 {
    font-size: 1.6rem;
    letter-spacing: -0.01em;
}

/* Components --------------------------------------------------------- */

.button {
    display: inline-block;
    padding: 0.7rem 1.4rem;
    border-radius: 0.5rem;
    background: var(--accent);
    color: #fff;
    font-weight: 600;
    text-decoration: none;
}

.button:hover {
    filter: brightness(1.08);
}

.grid {
    display: grid;
    gap: 1.25rem;
    grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
}

.card {
    padding: 1.5rem;
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    background: var(--card);
}

.card h3 {
    margin-top: 0;
}