/* ==========================================================================
   dark-factory.space — base theme
   Black background, white type, technical / terminal aesthetic.
   Accents sampled from the brand hex icons: violet, cyan, amber.
   ========================================================================== */

:root {
    --df-bg: #0a0a0c;
    --df-bg-2: #101014;
    --df-surface: #14141a;
    --df-surface-2: #1a1a22;
    --df-border: #26262f;
    --df-border-strong: #34343f;

    --df-fg: #ececf0;
    --df-fg-dim: #b7b7c2;
    --df-muted: #85858f;

    --df-violet: #7c6ff0;
    --df-cyan: #3fc5da;
    --df-amber: #e0a458;

    --df-accent: var(--df-cyan);
    --df-accent-ink: #04191d;

    --df-radius: 10px;
    --df-radius-sm: 6px;
    --df-maxw: 1120px;

    --df-font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --df-font-mono: ui-monospace, "JetBrains Mono", "SFMono-Regular", "Cascadia Code", Consolas, Menlo, monospace;
}

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

html { -webkit-text-size-adjust: 100%; }

body {
    margin: 0;
    background: var(--df-bg);
    color: var(--df-fg);
    font-family: var(--df-font-sans);
    font-size: 17px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    /* faint technical grid on the black */
    background-image:
        linear-gradient(rgba(255,255,255,0.014) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.014) 1px, transparent 1px);
    background-size: 44px 44px;
    background-position: center top;
}

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

h1, h2, h3, h4 {
    line-height: 1.15;
    letter-spacing: -0.01em;
    font-weight: 650;
    margin: 0 0 .5em;
}

h1 { font-size: clamp(2.1rem, 5vw, 3.6rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.2rem); }
h3 { font-size: 1.2rem; }

p { margin: 0 0 1rem; }

.df-container {
    width: 100%;
    max-width: var(--df-maxw);
    margin-inline: auto;
    padding-inline: 24px;
}

.df-mono {
    font-family: var(--df-font-mono);
    letter-spacing: 0;
}

.df-overline {
    font-family: var(--df-font-mono);
    font-size: .78rem;
    letter-spacing: .18em;
    text-transform: uppercase;
    color: var(--df-accent);
}

/* --- Skip link --- */
.skip-link {
    position: absolute;
    left: -999px;
    top: 0;
    background: var(--df-accent);
    color: var(--df-accent-ink);
    padding: 8px 14px;
    z-index: 100;
    border-radius: 0 0 var(--df-radius-sm) 0;
}
.skip-link:focus { left: 0; }

/* --- Buttons --- */
.df-btn {
    display: inline-flex;
    align-items: center;
    gap: .5ch;
    font-family: var(--df-font-mono);
    font-size: .92rem;
    font-weight: 600;
    line-height: 1;
    padding: .8em 1.3em;
    border-radius: var(--df-radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    transition: background-color .15s ease, border-color .15s ease, color .15s ease, transform .05s ease;
    text-decoration: none;
}
.df-btn:hover { text-decoration: none; }
.df-btn:active { transform: translateY(1px); }

.df-btn-primary {
    background: var(--df-accent);
    color: var(--df-accent-ink);
    border-color: var(--df-accent);
}
.df-btn-primary:hover { background: #57d6e9; border-color: #57d6e9; }

.df-btn-outline {
    background: transparent;
    color: var(--df-fg);
    border-color: var(--df-border-strong);
}
.df-btn-outline:hover { border-color: var(--df-accent); color: var(--df-accent); }

/* --- Header --- */
.df-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(10, 10, 12, 0.82);
    backdrop-filter: saturate(140%) blur(10px);
    border-bottom: 1px solid var(--df-border);
}
.df-nav {
    display: flex;
    align-items: center;
    gap: 24px;
    min-height: 64px;
}
.df-logo {
    display: inline-flex;
    align-items: center;
    gap: .55ch;
    color: var(--df-fg);
    font-family: var(--df-font-mono);
    font-weight: 700;
    letter-spacing: -0.01em;
    font-size: 1.02rem;
}
.df-logo:hover { text-decoration: none; }
.df-logo-mark { color: var(--df-accent); font-size: .8em; }
.df-logo-tld { color: var(--df-muted); font-weight: 500; }

.df-nav-links {
    display: flex;
    gap: 22px;
    margin: 0 0 0 auto;
    padding: 0;
    list-style: none;
}
.df-nav-link {
    color: var(--df-fg-dim);
    font-size: .95rem;
    font-family: var(--df-font-mono);
}
.df-nav-link:hover { color: var(--df-fg); text-decoration: none; }
.df-nav-cta { flex: 0 0 auto; }

/* --- Footer --- */
.df-footer {
    margin-top: 96px;
    border-top: 1px solid var(--df-border);
    background: var(--df-bg-2);
}
.df-footer-inner {
    display: flex;
    flex-wrap: wrap;
    gap: 48px;
    justify-content: space-between;
    padding-block: 48px 32px;
}
.df-footer-brand { max-width: 380px; }
.df-footer-logo {
    display: flex;
    align-items: center;
    gap: .5ch;
    font-family: var(--df-font-mono);
    font-weight: 700;
    margin: 0 0 .6rem;
}
.df-footer-tagline { color: var(--df-muted); font-size: .95rem; margin: 0; }
.df-footer-nav { display: flex; gap: 56px; flex-wrap: wrap; }
.df-footer-col-title {
    font-family: var(--df-font-mono);
    font-size: .74rem;
    letter-spacing: .16em;
    text-transform: uppercase;
    color: var(--df-muted);
    margin: 0 0 .8rem;
}
.df-footer-col ul { list-style: none; margin: 0; padding: 0; display: grid; gap: .5rem; }
.df-footer-col a { color: var(--df-fg-dim); font-size: .95rem; }
.df-footer-col a:hover { color: var(--df-accent); }

.df-footer-bottom { border-top: 1px solid var(--df-border); }
.df-footer-bottom-inner {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 24px;
    justify-content: space-between;
    padding-block: 20px;
    color: var(--df-muted);
    font-size: .84rem;
}
.df-footer-bottom-inner a { color: var(--df-fg-dim); }
.df-footer-note { margin: 0; }

@media (max-width: 760px) {
    .df-nav-links { display: none; }
    .df-footer-inner { gap: 32px; }
    .df-footer-nav { gap: 40px; }
}