/* ========== Design tokens ========== */
:root {
    --bg: #070708;
    --bg-elev: #0d0d10;
    --bg-elev-2: #141418;
    --fg: #e8e8ea;
    --fg-dim: #8a8a92;
    --fg-mute: #55555c;
    --line: #1f1f26;
    --line-strong: #2e2e38;

    --cyan: oklch(0.85 0.15 200);
    --cyan-dim: oklch(0.65 0.13 200);
    --cyan-glow: oklch(0.85 0.15 200 / 0.35);

    --burgundy: oklch(0.52 0.16 15);
    --burgundy-dim: oklch(0.40 0.14 15);
    --burgundy-glow: oklch(0.52 0.16 15 / 0.35);

    /* accent = lead accent; swap via [data-accent] */
    --accent: var(--cyan);
    --accent-dim: var(--cyan-dim);
    --accent-glow: var(--cyan-glow);
    --accent-sec: var(--burgundy);

    --mono: 'JetBrains Mono', 'Andale Mono', ui-monospace, Menlo, monospace;
    --display: 'Space Grotesk', ui-sans-serif, system-ui, sans-serif;

    --glow: 0 0 24px var(--accent-glow), 0 0 1px var(--accent);
    --glow-soft: 0 0 60px var(--accent-glow);
}

[data-accent="burgundy"] {
    --accent: var(--burgundy);
    --accent-dim: var(--burgundy-dim);
    --accent-glow: var(--burgundy-glow);
    --accent-sec: var(--cyan);
}

* { box-sizing: border-box; }
html, body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--fg);
    font-family: var(--mono);
    font-size: 14px;
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
    font-feature-settings: "ss01", "ss02", "calt", "liga";
}

a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }

/* ========== Global grid overlay + noise ========== */
body::before {
    content: "";
    position: fixed; inset: 0;
    background-image:
            linear-gradient(to right, rgba(255,255,255,0.018) 1px, transparent 1px),
            linear-gradient(to bottom, rgba(255,255,255,0.018) 1px, transparent 1px);
    background-size: 64px 64px;
    pointer-events: none;
    z-index: 1;
}
body::after {
    content: "";
    position: fixed; inset: 0;
    background:
            radial-gradient(circle at 20% 10%, var(--accent-glow), transparent 50%),
            radial-gradient(circle at 85% 85%, oklch(0.52 0.16 15 / 0.15), transparent 55%);
    opacity: 0.55;
    pointer-events: none;
    z-index: 0;
    filter: blur(40px);
}

main, nav, footer, header { position: relative; z-index: 2; }

/* ========== NAV ========== */
.nav {
    position: sticky;
    top: 0;
    z-index: 50;
    backdrop-filter: blur(18px);
    background: color-mix(in oklab, var(--bg) 78%, transparent);
    border-bottom: 1px solid var(--line);
}
.nav-inner {
    max-width: 1440px;
    margin: 0 auto;
    padding: 18px 48px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 48px;
}
.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    font-size: 13px;
}
.nav-links {
    display: flex;
    gap: 36px;
    font-size: 12px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--fg-dim);
}
.nav-links a {
    transition: color 0.2s;
    position: relative;
}
.nav-links a:hover { color: var(--accent); text-shadow: 0 0 8px var(--accent-glow); }
.nav-links a.active {
    color: var(--fg);
}
.nav-links a.active::before {
    content: ""; position: absolute; left: -10px; top: 50%; transform: translateY(-50%);
    width: 4px; height: 4px; background: var(--accent); border-radius: 50%;
    box-shadow: 0 0 8px var(--accent-glow);
}
.nav-cta {
    font-size: 11px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    border: 1px solid var(--line-strong);
    padding: 10px 18px;
    transition: all 0.25s;
    display: flex; align-items: center; gap: 10px;
}
.nav-cta:hover {
    border-color: var(--accent);
    color: var(--accent);
    box-shadow: var(--glow);
}

/* ========== Brand mark (original, not EPAM) ========== */
.brand-mark {
    width: 28px; height: 28px;
    display: inline-flex; align-items: center; justify-content: center;
    position: relative;
}
.brand-mark svg { width: 100%; height: 100%; }
.brand-mark .primary {
    stroke: var(--accent);
    filter: drop-shadow(0 0 8px var(--accent)) drop-shadow(0 0 16px var(--accent-glow));
}

/* ========== Shared utility ========== */
.container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 48px;
}

.section-label {
    display: flex;
    align-items: center;
    gap: 14px;
    font-size: 11px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--fg-dim);
    margin-bottom: 32px;
}
.section-label::before {
    content: ""; width: 28px; height: 1px; background: var(--accent);
}
.section-label .num { color: var(--accent); }

.eyebrow {
    font-size: 11px;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--accent);
}

h1, h2, h3, h4 { margin: 0; font-weight: 500; }

.display {
    font-family: var(--display);
    font-weight: 400;
    letter-spacing: -0.02em;
    line-height: 0.98;
}

/* Striped placeholder imagery */
.placeholder {
    position: relative;
    background: var(--bg-elev);
    border: 1px solid var(--line);
    background-image: repeating-linear-gradient(
            135deg,
            transparent 0 18px,
            rgba(255,255,255,0.018) 18px 19px
    );
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}
.placeholder::before {
    content: attr(data-label);
    font-size: 10px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--fg-mute);
    padding: 6px 10px;
    border: 1px dashed var(--line-strong);
}
.placeholder.accent::after {
    content: ""; position: absolute; inset: 0;
    background: linear-gradient(120deg, transparent, var(--accent-glow), transparent);
    mix-blend-mode: screen;
    opacity: 0.5;
}

/* Footer */
footer {
    border-top: 1px solid var(--line);
    margin-top: 120px;
    padding: 60px 0 40px;
    color: var(--fg-dim);
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 80px;
}
.footer-col h4 {
    font-size: 11px; letter-spacing: 0.2em; text-transform: uppercase;
    color: var(--fg); margin-bottom: 20px;
}
.footer-col ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 10px; font-size: 12px; }
.footer-col a:hover { color: var(--accent); }
.footer-bottom {
    display: flex; justify-content: space-between; font-size: 11px;
    letter-spacing: 0.12em; text-transform: uppercase; color: var(--fg-mute);
    padding-top: 24px; border-top: 1px solid var(--line);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 14px;
    padding: 16px 24px;
    border: 1px solid var(--accent);
    color: var(--accent);
    font-size: 12px;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    position: relative;
    transition: all 0.25s;
    background: color-mix(in oklab, var(--accent) 6%, transparent);
}
.btn:hover {
    background: var(--accent);
    color: var(--bg);
    box-shadow: var(--glow), 0 0 80px var(--accent-glow);
}
.btn.ghost {
    border-color: var(--line-strong);
    color: var(--fg);
    background: transparent;
}
.btn.ghost:hover {
    border-color: var(--fg);
    background: transparent;
    color: var(--fg);
    box-shadow: none;
}
.btn .arrow { transition: transform 0.25s; }
.btn:hover .arrow { transform: translateX(4px); }

/* Tweaks panel */
.tweaks-panel {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 200;
    background: var(--bg-elev);
    border: 1px solid var(--line-strong);
    padding: 16px 18px;
    font-size: 11px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    min-width: 240px;
    display: none;
}
.tweaks-panel.on { display: block; }
.tweaks-panel .tp-title {
    color: var(--fg-dim);
    display: flex; justify-content: space-between;
    margin-bottom: 14px;
}
.tweaks-panel .tp-row {
    display: flex; align-items: center; justify-content: space-between;
    gap: 12px; margin-bottom: 10px;
}
.tweaks-panel .tp-pill {
    display: inline-flex; gap: 4px; padding: 3px;
    border: 1px solid var(--line-strong);
}
.tweaks-panel .tp-pill button {
    padding: 6px 10px; font-size: 10px; letter-spacing: 0.14em;
    color: var(--fg-dim);
}
.tweaks-panel .tp-pill button.on {
    background: var(--accent); color: var(--bg);
}

/* Blink */
@keyframes blink { 50% { opacity: 0; } }
.blink { animation: blink 1s steps(2) infinite; }

/* Scanline subtle */
.scanlines {
    position: relative;
}
.scanlines::after {
    content: "";
    position: absolute; inset: 0;
    background: repeating-linear-gradient(
            to bottom,
            transparent 0 2px,
            rgba(255,255,255,0.015) 2px 3px
    );
    pointer-events: none;
}

/* ========== HAMBURGER TOGGLE ========== */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 38px;
    height: 38px;
    cursor: pointer;
    border: 1px solid var(--line-strong);
    background: none;
    padding: 8px;
    flex-shrink: 0;
    transition: border-color 0.2s;
}
.nav-toggle:hover { border-color: var(--accent); }
.nav-toggle span {
    display: block;
    width: 18px;
    height: 1.5px;
    background: var(--fg);
    transition: transform 0.3s ease, opacity 0.2s ease, background 0.2s;
    transform-origin: center;
}
.nav-toggle[aria-expanded="true"] { border-color: var(--accent); }
.nav-toggle[aria-expanded="true"] span { background: var(--accent); }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* ========== SMOOTH SCROLL ========== */
html { scroll-behavior: smooth; }

/* ========== RESPONSIVE — 1024px ========== */
@media (max-width: 1024px) {
    .nav-inner { padding: 16px 32px; gap: 24px; }
    .container { padding: 0 32px; }
    .footer-grid { grid-template-columns: 1.5fr 1fr 1fr; gap: 32px; }
}

/* ========== RESPONSIVE — 768px ========== */
@media (max-width: 768px) {
    .nav-toggle { display: flex; }
    .nav-cta { display: none; }
    .nav-inner { padding: 14px 20px; gap: 0; }

    /* Mobile nav overlay */
    .nav-links {
        position: fixed;
        inset: 0;
        background: rgba(7, 7, 8, 0.96);
        background: color-mix(in oklab, var(--bg) 96%, transparent);
        backdrop-filter: blur(24px) saturate(1.5);
        -webkit-backdrop-filter: blur(24px) saturate(1.5);
        z-index: 49;
        flex-direction: column;
        align-items: stretch;
        justify-content: center;
        gap: 0;
        padding: 66px 28px 20px;
        overflow: hidden;
        visibility: hidden;
        opacity: 0;
        pointer-events: none;
        transform: translateY(-10px);
        transition: opacity 0.25s ease, transform 0.25s ease, visibility 0s linear 0.25s;
    }
    .nav-links.is-open {
        visibility: visible;
        opacity: 1;
        pointer-events: auto;
        transform: translateY(0);
        transition: opacity 0.25s ease, transform 0.25s ease, visibility 0s linear 0s;
    }
    .nav-links a {
        display: block;
        padding: 12px 0;
        border-bottom: 1px solid var(--line);
        font-size: 13px;
        letter-spacing: 0.06em;
        color: var(--fg);
        transition: color 0.2s ease, padding-left 0.2s ease;
    }
    .nav-links a:last-child { border-bottom: none; }
    .nav-links a:hover, .nav-links a.active {
        color: var(--accent);
        text-shadow: 0 0 10px var(--accent-glow);
        padding-left: 10px;
    }
    .nav-links a.active::before { display: none; }

    .container { padding: 0 20px; }

    /* Footer */
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; margin-bottom: 40px; }
    footer { margin-top: 60px; padding: 48px 0 32px; }
    .footer-bottom { flex-direction: column; gap: 8px; align-items: flex-start; }

    /* Tweaks panel */
    .tweaks-panel { right: 16px; bottom: 16px; min-width: auto; max-width: calc(100vw - 32px); }
}

/* ========== RESPONSIVE — 480px ========== */
@media (max-width: 480px) {
    .nav-inner { padding: 12px 16px; }
    .container { padding: 0 16px; }
    .footer-grid { grid-template-columns: 1fr; gap: 24px; }
    .footer-bottom { font-size: 10px; }
}

/* Lock scroll when mobile menu open */
body.nav-open { overflow: hidden; }