/* ============================================================
   DKsystem – Shared Header / Central Menu
   Optional file for the JS-driven shared top navigation.
   - Designed to match download/contact/trust pages first
   - Safe to omit if you want to keep each page's local menu CSS
   ============================================================ */

:root {
    --content-page-h1-size: clamp(1.25rem, 3.8vw, 3.0rem);
    --site-header-text: var(--text, #1f232d);
    --site-header-muted: var(--muted, #5d6470);
    --site-header-accent: var(--accent-strong, #2e3a4d);
    --site-header-border: var(--border, rgba(31, 35, 45, 0.14));
    --site-header-surface: var(--panel-strong, rgba(255, 255, 255, 0.40));
    --site-header-shadow: var(--shadow, 0 18px 40px rgba(16, 21, 31, 0.12));
    --site-header-menu-surface: rgba(14, 20, 31, 0.52);
    --site-header-menu-surface-strong: rgba(14, 20, 31, 0.7);
    --site-header-menu-text: #ffffff;
}

.site-header {
    position: relative;
    z-index: 20;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px 24px;
    padding: 30px 50px 10px;
    width: 100%;
}

.site-header .logo {
    font-size: 1.05rem;
    font-weight: 700;
    letter-spacing: 0.16em;
}

.site-header .logo a {
    color: var(--site-header-text);
    text-decoration: none;
}

.home-page .site-header .logo a {
    color: #ffffff;
    text-shadow: 0 2px 14px rgba(0, 0, 0, 0.35);
}

.site-header .menu {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    row-gap: 10px;
    flex: 1 1 360px;
    min-width: 0;
    flex-wrap: wrap;
}

.site-header .menu a {
    position: relative;
    color: var(--site-header-menu-text);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.14em;
    text-decoration: none;
    padding: 8px 14px;
    border-radius: 999px;
    background: var(--site-header-menu-surface);
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 20px rgba(8, 12, 18, 0.16);
    text-shadow: 0 1px 8px rgba(0, 0, 0, 0.35);
    transition: color 0.25s ease, background-color 0.25s ease, opacity 0.25s ease;
    opacity: 0.92;
}

.site-header .menu a::after {
    content: "";
    position: absolute;
    left: 12px;
    bottom: 4px;
    width: calc(100% - 24px);
    height: 2px;
    background: currentColor;
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.25s ease;
}

.site-header .menu a:hover,
.site-header .menu a.active {
    color: var(--site-header-menu-text);
    background: var(--site-header-menu-surface-strong);
    opacity: 1;
}

.site-header .menu a:hover::after,
.site-header .menu a.active::after {
    transform: scaleX(1);
}

.site-header .contact-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 11px 20px;
    border-radius: 999px;
    border: 1px solid var(--site-header-border);
    background: var(--site-header-surface);
    color: var(--site-header-text);
    font-size: 0.82rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-decoration: none;
    backdrop-filter: blur(10px);
    flex-shrink: 0;
    transition: transform 0.2s ease, box-shadow 0.25s ease, background-color 0.25s ease, color 0.25s ease, border-color 0.25s ease;
}

.site-header .contact-btn:hover,
.site-header .contact-btn.active {
    transform: translateY(-2px);
    box-shadow: var(--site-header-shadow);
}

.site-header .menu a:focus-visible,
.site-header .contact-btn:focus-visible {
    outline: 2px solid var(--site-header-accent);
    outline-offset: 4px;
}

@media (max-width: 820px) {
    .site-header {
        padding: 22px 20px 8px;
        flex-direction: column;
        align-items: flex-start;
    }

    .site-header .menu {
        width: 100%;
        gap: 8px;
    }

    .site-header .contact-btn {
        width: 100%;
    }
}