/* ============================================================
   The TechX — unified site navigation
   Used on index, tools, resources, claude_playbook,
   privacy-policy, terms&conditions
   ============================================================ */

:root {
    --site-nav-height: 72px;
    --site-nav-text: #4b5563;
    --site-nav-text-strong: #111827;
    --site-nav-muted: #6b7280;
    --site-nav-bg: rgba(255, 255, 255, 0.88);
    --site-nav-border: #e5e7eb;
    --site-nav-primary: #dc2626;
    --site-nav-primary-dark: #b91c1c;
    --site-nav-soft: #fef2f2;
}

body.has-site-nav { padding-top: var(--site-nav-height); }

/* ---------- Header shell ---------- */
.site-header {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--site-nav-height);
    z-index: 1200;
    background: var(--site-nav-bg);
    -webkit-backdrop-filter: saturate(180%) blur(14px);
    backdrop-filter: saturate(180%) blur(14px);
    border-bottom: 1px solid transparent;
    transition: background .25s ease, border-color .25s ease, box-shadow .25s ease;
}
.site-header.scrolled {
    background: rgba(255, 255, 255, 0.96);
    border-bottom-color: var(--site-nav-border);
    box-shadow: 0 6px 24px -16px rgba(15, 23, 42, .18);
}

.site-header-inner {
    max-width: 1200px;
    height: 100%;
    margin: 0 auto;
    padding: 0 clamp(20px, 4vw, 40px);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.site-logo { display: inline-flex; align-items: center; line-height: 1; }
.site-logo img { height: 48px; width: auto; display: block; transition: transform .25s ease; }
.site-logo:hover img { transform: scale(1.03); }

@media (max-width: 600px) {
    .site-logo img { height: 40px; }
}

/* ---------- Nav links ---------- */
.site-nav {
    display: flex;
    align-items: center;
    gap: 4px;
}

.site-nav > a,
.site-nav-item > .site-nav-trigger {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 9px 14px;
    border-radius: 999px;
    font-family: inherit;
    font-size: .9rem;
    font-weight: 500;
    line-height: 1;
    color: var(--site-nav-text);
    text-decoration: none;
    background: transparent;
    border: none;
    cursor: pointer;
    white-space: nowrap;
    transition: color .2s ease, background .2s ease;
}
.site-nav > a,
.site-nav > a:hover,
.site-nav > a:focus,
.site-nav > a:active,
.site-nav-item > .site-nav-trigger:hover,
.site-nav-item > .site-nav-trigger:focus {
    text-decoration: none;
}

.site-nav > a:hover,
.site-nav-item > .site-nav-trigger:hover {
    color: var(--site-nav-primary);
    background: var(--site-nav-soft);
}

.site-nav > a.active,
.site-nav-item.active > .site-nav-trigger {
    color: var(--site-nav-primary);
    background: var(--site-nav-soft);
    font-weight: 600;
}

/* ---------- Dropdown ---------- */
.site-nav-item { position: relative; }

.site-nav-trigger .chev {
    display: inline-block;
    width: 7px;
    height: 7px;
    border-right: 1.6px solid currentColor;
    border-bottom: 1.6px solid currentColor;
    transform: rotate(45deg) translate(-2px, -2px);
    opacity: .7;
    transition: transform .2s ease, opacity .2s ease;
}
.site-nav-item:hover .site-nav-trigger .chev,
.site-nav-item.open .site-nav-trigger .chev {
    transform: rotate(225deg) translate(-2px, -2px);
    opacity: 1;
}

.site-nav-dropdown {
    position: absolute;
    top: calc(100% + 10px);
    left: 50%;
    min-width: 260px;
    padding: 8px;
    background: #fff;
    border: 1px solid var(--site-nav-border);
    border-radius: 16px;
    box-shadow: 0 24px 48px -20px rgba(15, 23, 42, .22);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translate(-50%, -8px);
    transition: opacity .22s ease, transform .22s ease, visibility .22s;
}

/* Invisible hover bridge so the dropdown stays open while traveling */
.site-nav-dropdown::before {
    content: "";
    position: absolute;
    top: -12px;
    left: 0;
    right: 0;
    height: 12px;
}

.site-nav-item:hover > .site-nav-dropdown,
.site-nav-item:focus-within > .site-nav-dropdown,
.site-nav-item.open > .site-nav-dropdown {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translate(-50%, 0);
}

.site-nav-dropdown a {
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding: 10px 14px;
    border-radius: 10px;
    text-decoration: none;
    transition: background .15s ease;
}
.site-nav-dropdown a:hover,
.site-nav-dropdown a:focus { text-decoration: none; }
.site-nav-dropdown a .ddi-title {
    font-size: .9rem;
    font-weight: 600;
    color: var(--site-nav-text-strong);
    letter-spacing: -0.005em;
}
.site-nav-dropdown a .ddi-sub {
    font-size: .76rem;
    color: var(--site-nav-muted);
    font-weight: 400;
    line-height: 1.4;
}
.site-nav-dropdown a:hover,
.site-nav-dropdown a.active {
    background: var(--site-nav-soft);
}
.site-nav-dropdown a:hover .ddi-title,
.site-nav-dropdown a.active .ddi-title {
    color: var(--site-nav-primary);
}

/* ---------- CTA ---------- */
.site-nav .site-nav-cta {
    background: var(--site-nav-primary);
    color: #fff !important;
    padding: 9px 18px;
    border-radius: 999px;
    font-weight: 600 !important;
    margin-left: 6px;
    box-shadow: 0 8px 20px -10px rgba(220, 38, 38, .55);
    transition: background .2s ease, transform .2s ease, box-shadow .2s ease;
}
.site-nav .site-nav-cta:hover {
    background: var(--site-nav-primary-dark);
    color: #fff !important;
    transform: translateY(-1px);
    box-shadow: 0 12px 24px -10px rgba(220, 38, 38, .6);
    text-decoration: none;
}
.site-nav .site-nav-cta,
.site-nav .site-nav-cta:focus { text-decoration: none; }
.site-nav .site-nav-cta::after {
    content: " →";
    margin-left: 2px;
    transition: margin-left .2s ease;
}
.site-nav .site-nav-cta:hover::after { margin-left: 6px; }

/* ---------- Mobile menu button ---------- */
.site-menu-btn {
    display: none;
    width: 42px;
    height: 42px;
    border: 1px solid var(--site-nav-border);
    background: #fff;
    border-radius: 12px;
    font-size: 1.05rem;
    color: var(--site-nav-text-strong);
    cursor: pointer;
    align-items: center;
    justify-content: center;
    transition: border-color .2s ease, color .2s ease;
}
.site-menu-btn:hover {
    border-color: var(--site-nav-primary);
    color: var(--site-nav-primary);
}

/* ============================================================
   Mobile
   ============================================================ */
@media (max-width: 900px) {
    .site-menu-btn { display: inline-flex; }

    .site-nav {
        position: fixed;
        top: var(--site-nav-height);
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: stretch;
        gap: 4px;
        padding: 14px clamp(16px, 4vw, 24px) 22px;
        background: #fff;
        border-bottom: 1px solid var(--site-nav-border);
        max-height: calc(100vh - var(--site-nav-height));
        overflow-y: auto;
        transform: translateY(-110%);
        opacity: 0;
        pointer-events: none;
        transition: transform .28s ease, opacity .28s ease;
        box-shadow: 0 24px 30px -20px rgba(0, 0, 0, .18);
    }
    .site-nav.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }

    .site-nav > a,
    .site-nav-item > .site-nav-trigger {
        width: 100%;
        justify-content: space-between;
        padding: 13px 16px;
        border-radius: 12px;
        font-size: .95rem;
    }
    .site-nav-item { width: 100%; }

    .site-nav-dropdown {
        position: static;
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
        transform: none !important;
        box-shadow: none;
        border: none;
        background: transparent;
        padding: 4px 0 6px 14px;
        min-width: 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height .25s ease;
    }
    .site-nav-dropdown::before { display: none; }
    .site-nav-item.open > .site-nav-dropdown,
    .site-nav-item:focus-within > .site-nav-dropdown {
        max-height: 360px;
    }

    .site-nav-dropdown a {
        padding: 10px 12px;
        border-left: 2px solid var(--site-nav-border);
        border-radius: 0 10px 10px 0;
        margin-left: 2px;
    }
    .site-nav-dropdown a:hover,
    .site-nav-dropdown a.active {
        border-left-color: var(--site-nav-primary);
    }

    .site-nav .site-nav-cta {
        margin: 8px 0 0;
        text-align: center;
        justify-content: center;
    }
}

@media (prefers-reduced-motion: reduce) {
    .site-nav,
    .site-nav-dropdown,
    .site-nav .site-nav-cta,
    .site-nav .site-nav-cta::after,
    .site-nav-trigger .chev {
        transition: none !important;
    }
}