/* =========================================================================
   Better Trove Tools - Documentation styles
   Shares the brand palette with the landing page (style.css).
   ========================================================================= */

:root {
    --bg-dark: #12161c;
    --bg-panel: #1d232b;
    --bg-elev: #232a34;
    --bg-code: #0d1117;
    --border-color: #2d3542;
    --border-soft: #232a34;
    --text-main: #ffffff;
    --text-muted: #a3adc2;
    --text-dim: #79839a;
    --accent-blue: #5ec6ff;
    --accent-orange: #ff9800;
    --accent-yellow: #fbc02d;
    --accent-green: #46d39a;
    --accent-purple: #b794f6;
    --accent-red: #ff6b6b;
    --discord-blurple: #5865F2;
    --sidebar-w: 280px;
    --navbar-h: 60px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body, html {
    margin: 0;
    padding: 0;
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    line-height: 1.65;
}

a { color: var(--accent-blue); text-decoration: none; }
a:hover { text-decoration: underline; }

.highlight-blue { color: var(--accent-blue); }
.highlight-orange { color: var(--accent-orange); }
.highlight-yellow { color: var(--accent-yellow); }

/* ---------------------------------------------------------------- Navbar */
.navbar {
    position: fixed; top: 0; left: 0; width: 100%;
    height: var(--navbar-h);
    display: flex; align-items: center;
    background: rgba(18, 22, 28, 0.92);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
}
.nav-container {
    width: 100%; max-width: 1500px; margin: 0 auto;
    display: flex; justify-content: space-between; align-items: center;
    padding: 0 20px; gap: 16px;
}
.nav-logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.05rem; }
/* See style.css note - favicon.png has transparent padding; bump to 32px so
   the actual visible artwork matches the wordmark height instead of reading
   as a small/cropped icon. */
.nav-logo img { height: 32px; width: auto; }
.nav-actions { display: flex; align-items: center; gap: 8px; }
.nav-link {
    color: var(--text-muted); font-size: 0.9rem; font-weight: 600;
    padding: 8px 14px; border-radius: 8px; transition: 0.18s; white-space: nowrap;
    display: inline-flex; align-items: center; gap: 8px;
}
.nav-link:hover { color: #fff; background: rgba(255,255,255,0.06); text-decoration: none; }
.nav-link.primary { background: var(--accent-blue); color: #06131c; }
.nav-link.primary:hover { background: #7ad2ff; }
.nav-link.discord { background: var(--discord-blurple); color: #fff; }
.nav-link.discord:hover { background: #6b76f4; }

.mobile-menu-btn {
    display: none; background: transparent; border: 1px solid var(--border-color);
    color: var(--text-main); width: 40px; height: 40px; border-radius: 8px;
    font-size: 1.1rem; cursor: pointer;
}

/* Language switcher */
.lang-picker { position: relative; display: inline-flex; align-items: center; }
.lang-picker-icon {
    position: absolute; left: 11px; top: 50%; transform: translateY(-50%);
    font-size: 0.8rem; color: var(--accent-blue); pointer-events: none;
}
.lang-select {
    appearance: none; -webkit-appearance: none; -moz-appearance: none;
    background-color: var(--bg-panel); color: #fff;
    border: 1px solid var(--border-color); border-radius: 8px;
    padding: 8px 32px 8px 32px;
    font-size: 0.85rem; font-weight: 600; cursor: pointer; font-family: inherit;
    outline: none; transition: 0.2s;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23a3adc2' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'><polyline points='6 9 12 15 18 9'/></svg>");
    background-repeat: no-repeat; background-position: right 11px center;
}
.lang-select:hover { background-color: var(--bg-elev); border-color: var(--accent-blue); }
.lang-select:focus-visible { border-color: var(--accent-blue); box-shadow: 0 0 0 3px rgba(94,198,255,0.25); }
.lang-picker:hover .lang-picker-icon { color: #7ad2ff; }
.lang-select option { background: var(--bg-panel); color: #fff; }

/* ----------------------------------------------------------- Page layout */
.docs-layout {
    display: flex;
    /* Match the site-wide ~92% content width (style.css --content-max) so the
       sidebar + content use ≥80% of the desktop instead of a 1500px column. */
    max-width: 92vw;
    margin: 0 auto;
    padding-top: var(--navbar-h);
}

/* --------------------------------------------------------------- Sidebar */
.sidebar {
    position: sticky;
    top: var(--navbar-h);
    align-self: flex-start;
    width: var(--sidebar-w);
    flex-shrink: 0;
    height: calc(100vh - var(--navbar-h));
    overflow-y: auto;
    padding: 24px 16px 60px;
    border-right: 1px solid var(--border-color);
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) transparent;
}
.sidebar::-webkit-scrollbar { width: 8px; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 8px; }

.sidebar-search {
    position: relative; margin-bottom: 20px;
}
.sidebar-search i {
    position: absolute; left: 12px; top: 50%; transform: translateY(-50%);
    color: var(--text-dim); font-size: 0.85rem; pointer-events: none;
}
.sidebar-search input {
    width: 100%; padding: 10px 12px 10px 34px;
    background: var(--bg-code); border: 1px solid var(--border-color);
    border-radius: 8px; color: var(--text-main); font-size: 0.9rem;
    outline: none; transition: border-color 0.18s;
}
.sidebar-search input:focus { border-color: var(--accent-blue); }
.sidebar-search input::placeholder { color: var(--text-dim); }

.nav-group { margin-bottom: 22px; }
.nav-group-title {
    font-size: 0.72rem; font-weight: 700; text-transform: uppercase;
    letter-spacing: 1.2px; color: var(--text-dim);
    padding: 0 12px 8px; display: flex; align-items: center; gap: 8px;
}
.nav-group ul { list-style: none; margin: 0; padding: 0; }
.nav-group li a {
    display: flex; align-items: center; gap: 10px;
    padding: 8px 12px; border-radius: 8px;
    color: var(--text-muted); font-size: 0.92rem; font-weight: 500;
    transition: 0.15s; border-left: 2px solid transparent;
}
.nav-group li a i { width: 18px; text-align: center; font-size: 0.85rem; color: var(--text-dim); transition: 0.15s; }
.nav-group li a:hover {
    color: #fff; background: rgba(255,255,255,0.04); text-decoration: none;
}
.nav-group li a.active {
    color: var(--accent-blue); background: rgba(94, 198, 255, 0.10);
    border-left-color: var(--accent-blue);
}
.nav-group li a.active i { color: var(--accent-blue); }
.nav-empty {
    display: none; padding: 12px; color: var(--text-dim); font-size: 0.85rem; text-align: center;
}

/* --------------------------------------------------------------- Content */
.content {
    flex: 1;
    min-width: 0;
    padding: 40px 48px 120px;
    /* Fill the space beside the sidebar (was capped at 980px) so the page uses
       the full ≥80% layout width. */
    max-width: none;
}

.docs-hero {
    margin-bottom: 48px;
    padding-bottom: 36px;
    border-bottom: 1px solid var(--border-color);
}
.docs-hero .eyebrow {
    color: var(--accent-blue); font-weight: 700; font-size: 0.8rem;
    text-transform: uppercase; letter-spacing: 1.5px; margin: 0 0 10px;
}
.docs-hero h1 { font-size: clamp(2rem, 5vw, 2.8rem); margin: 0 0 14px; line-height: 1.15; }
.docs-hero p { color: var(--text-muted); font-size: 1.12rem; margin: 0; max-width: 720px; }

.hero-badges { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.hero-badge {
    display: inline-flex; align-items: center; gap: 8px;
    background: var(--bg-panel); border: 1px solid var(--border-color);
    padding: 8px 14px; border-radius: 999px; font-size: 0.85rem; color: var(--text-muted);
}
.hero-badge i { color: var(--accent-blue); }

/* Section */
.doc-section { scroll-margin-top: calc(var(--navbar-h) + 20px); margin-bottom: 28px; }
.section-heading {
    display: flex; align-items: center; gap: 14px;
    margin: 56px 0 8px; padding-top: 8px;
}
.section-heading:first-of-type { margin-top: 0; }
.section-heading .sec-icon {
    flex-shrink: 0; width: 46px; height: 46px; border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.25rem; background: var(--bg-panel);
    border: 1px solid var(--border-color); color: var(--accent-blue);
}
.section-heading h2 { font-size: 1.75rem; margin: 0; }
.section-lead { color: var(--text-muted); font-size: 1.05rem; margin: 0 0 24px 60px; }
@media (max-width: 600px) { .section-lead { margin-left: 0; } }

/* Feature card */
.feature-block {
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    padding: 28px;
    margin-bottom: 24px;
}
.feature-head { display: flex; align-items: center; gap: 14px; margin-bottom: 8px; }
.feature-head .f-icon {
    width: 42px; height: 42px; border-radius: 10px; flex-shrink: 0;
    display: flex; align-items: center; justify-content: center; font-size: 1.15rem;
    background: var(--bg-elev); border: 1px solid var(--border-color);
}
.feature-head .kicker {
    margin: 0; font-size: 0.72rem; font-weight: 700; text-transform: uppercase;
    letter-spacing: 1px; color: var(--accent-purple);
}
.feature-head h3 { margin: 2px 0 0; font-size: 1.3rem; }
.feature-block > p { color: var(--text-muted); }
.feature-block > p:first-of-type { margin-top: 14px; }

/* Callouts */
.callout {
    border-radius: 0 10px 10px 0;
    padding: 16px 20px;
    margin: 20px 0;
    border-left: 4px solid var(--accent-blue);
    background: rgba(94, 198, 255, 0.06);
}
.callout h4 {
    margin: 0 0 10px; font-size: 1rem; color: var(--accent-blue);
    display: flex; align-items: center; gap: 8px;
}
.callout ol, .callout ul { margin: 0; padding-left: 22px; }
.callout li { margin-bottom: 8px; }
.callout li:last-child { margin-bottom: 0; }
.callout p { margin: 8px 0 0; }
.callout p:first-child { margin-top: 0; }

.callout.tip { border-left-color: var(--accent-green); background: rgba(70, 211, 154, 0.07); }
.callout.tip h4 { color: var(--accent-green); }
.callout.warn { border-left-color: var(--accent-orange); background: rgba(255, 152, 0, 0.07); }
.callout.warn h4 { color: var(--accent-orange); }
.callout.danger { border-left-color: var(--accent-red); background: rgba(255, 107, 107, 0.08); }
.callout.danger h4 { color: var(--accent-red); }

/* Inline UI references */
.ui-btn {
    background: var(--bg-code); padding: 2px 9px; border: 1px solid var(--border-color);
    border-radius: 6px; font-family: 'Consolas', monospace; color: #fff; font-size: 0.88em;
    white-space: nowrap;
}
kbd {
    background: var(--bg-elev); border: 1px solid var(--border-color);
    border-bottom-width: 2px; border-radius: 6px; padding: 2px 8px;
    font-family: 'Consolas', monospace; font-size: 0.85em; color: #fff; white-space: nowrap;
}
code {
    background: var(--bg-code); border: 1px solid var(--border-soft);
    padding: 1px 6px; border-radius: 5px; font-family: 'Consolas', monospace;
    font-size: 0.88em; color: var(--accent-orange);
}

/* Screenshot */
.shot { margin: 22px 0 4px; }
.shot img {
    width: 100%; height: auto; display: block;
    border-radius: 12px; border: 1px solid var(--border-color);
    box-shadow: 0 18px 40px rgba(0,0,0,0.45);
}
.shot figcaption { margin-top: 10px; color: var(--text-dim); font-size: 0.85rem; text-align: center; }

/* Feature pill list */
.pill-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 16px 0; }
.pill {
    display: inline-flex; align-items: center; gap: 7px;
    background: var(--bg-elev); border: 1px solid var(--border-color);
    border-radius: 999px; padding: 6px 13px; font-size: 0.85rem; color: var(--text-muted);
}
.pill i { color: var(--accent-blue); font-size: 0.8rem; }

/* Beta / tag chip */
.tag {
    font-size: 0.62rem; font-weight: 700; letter-spacing: 0.5px;
    padding: 2px 7px; border-radius: 5px; text-transform: uppercase;
    background: rgba(183, 148, 246, 0.18); color: var(--accent-purple);
    border: 1px solid rgba(183, 148, 246, 0.35); vertical-align: middle;
}
.tag.exp { background: rgba(255, 152, 0, 0.16); color: var(--accent-orange); border-color: rgba(255,152,0,0.35); }

/* Grid of mini-cards (e.g. codex list, calculators) */
.mini-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 14px; margin: 18px 0;
}
.mini-card {
    background: var(--bg-elev); border: 1px solid var(--border-color);
    border-radius: 10px; padding: 16px;
}
.mini-card h4 { margin: 0 0 6px; font-size: 1rem; display: flex; align-items: center; gap: 9px; }
.mini-card h4 i { color: var(--accent-blue); }
.mini-card p { margin: 0; color: var(--text-muted); font-size: 0.9rem; }

/* FAQ */
.faq details {
    background: var(--bg-panel); border: 1px solid var(--border-color);
    border-radius: 10px; padding: 0; margin-bottom: 12px; overflow: hidden;
}
.faq summary {
    cursor: pointer; padding: 16px 20px; font-weight: 600; list-style: none;
    display: flex; align-items: center; justify-content: space-between; gap: 12px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "\f078"; font-family: "Font Awesome 6 Free"; font-weight: 900; color: var(--text-dim); font-size: 0.8rem; transition: 0.2s; }
.faq details[open] summary::after { transform: rotate(180deg); }
.faq details[open] summary { border-bottom: 1px solid var(--border-color); color: var(--accent-blue); }
.faq .faq-body { padding: 16px 20px; color: var(--text-muted); }
.faq .faq-body p { margin: 0; }

/* Footer */
.docs-footer {
    border-top: 1px solid var(--border-color);
    margin-top: 60px; padding-top: 28px;
    color: var(--text-dim); font-size: 0.9rem;
    display: flex; flex-wrap: wrap; gap: 16px; justify-content: space-between; align-items: center;
}
.docs-footer a { color: var(--text-muted); }

/* Back-to-top */
#to-top {
    position: fixed; right: 24px; bottom: 24px; z-index: 900;
    width: 46px; height: 46px; border-radius: 50%;
    background: var(--accent-blue); color: #06131c; border: none;
    font-size: 1rem; cursor: pointer; display: none;
    align-items: center; justify-content: center;
    box-shadow: 0 8px 24px rgba(0,0,0,0.45); transition: transform 0.18s;
}
#to-top:hover { transform: translateY(-3px); }
#to-top.show { display: flex; }

/* Sidebar backdrop (mobile) */
.sidebar-backdrop {
    display: none; position: fixed; inset: var(--navbar-h) 0 0 0;
    background: rgba(0,0,0,0.5); z-index: 800;
}

/* ------------------------------------------------------------ Responsive */
@media (max-width: 980px) {
    .content { padding: 32px 28px 100px; }
}

@media (max-width: 860px) {
    .mobile-menu-btn { display: inline-flex; align-items: center; justify-content: center; }
    .nav-actions .nav-link.label-only { display: none; }

    .sidebar {
        position: fixed; top: var(--navbar-h); left: 0; bottom: 0;
        width: 290px; max-width: 85vw; height: auto;
        background: var(--bg-dark); z-index: 850;
        transform: translateX(-100%); transition: transform 0.25s ease;
        box-shadow: 4px 0 24px rgba(0,0,0,0.5);
    }
    .sidebar.open { transform: translateX(0); }
    .sidebar-backdrop.show { display: block; }
    .content { padding: 28px 20px 90px; max-width: 100%; }
    .feature-block { padding: 20px; }
}

/* ----------------------------------------------------------------------------
   Mobile navbar (≤768px): drop every desktop nav item and reduce the navbar
   to logo + ONE hamburger. The hamburger:
   - on docs.html → opens the sidebar drawer, which has been augmented with
     site nav links + lang picker at its top so it's the unified mobile menu
   - on unlock_*.html → opens a slide-down `.unlock-nav-panel` with site links
   Both pages share the same `.mobile-menu-btn` styling.
   ---------------------------------------------------------------------------- */
@media (max-width: 860px) {
    /* The hamburger (.mobile-menu-btn) already becomes visible at this same
       breakpoint above; hide the desktop nav items here so logo + hamburger
       is the only thing on the bar - no orphan tablet zone where the items
       disappear but no hamburger has shown up yet. */
    .nav-container { padding: 0 14px; gap: 10px; }
    .nav-actions > .nav-link,
    .nav-actions > .lang-picker { display: none !important; }
    .nav-actions { gap: 0; }
}

/* Sidebar header on mobile - site nav + language picker injected ABOVE the
   doc-section nav so the sidebar drawer is the complete mobile menu. */
.sidebar-mobile-nav { display: none; }  /* hidden on desktop */
@media (max-width: 860px) {
    .sidebar-mobile-nav {
        display: flex;
        flex-direction: column;
        gap: 4px;
        padding: 4px 0 14px;
        margin-bottom: 14px;
        border-bottom: 1px solid var(--border-color);
    }
    .sidebar-mobile-nav a {
        display: flex; align-items: center; gap: 10px;
        padding: 10px 12px; border-radius: 8px;
        color: var(--text-muted); font-size: 0.95rem; font-weight: 600;
        background: rgba(255, 255, 255, 0.03);
        text-decoration: none; transition: 0.15s;
    }
    .sidebar-mobile-nav a:hover { color: #fff; background: rgba(255, 255, 255, 0.07); }
    .sidebar-mobile-nav a i { width: 18px; text-align: center; color: var(--accent-blue); }
    .sidebar-mobile-nav a.primary { background: var(--accent-blue); color: #06131c; }
    .sidebar-mobile-nav a.primary i { color: #06131c; }
    .sidebar-mobile-nav a.discord { background: var(--discord-blurple); color: #fff; }
    .sidebar-mobile-nav a.discord i { color: #fff; }
    .sidebar-mobile-nav .sidebar-lang {
        margin-top: 8px;
        padding-top: 12px;
        border-top: 1px solid var(--border-color);
    }
    .sidebar-mobile-nav .sidebar-lang .lang-select {
        width: 100%; padding: 10px 32px 10px 34px; font-size: 0.9rem;
    }
}

/* Slide-down nav panel for the unlock_* pages - same shape as the home page's
   .nav-links panel but tied to docs.css's .navbar (which is the only navbar on
   those pages). Toggled by .navbar.open via inline JS in the templates. */
.unlock-nav-panel {
    position: absolute;
    top: 100%; left: 0; right: 0;
    display: flex; flex-direction: column; gap: 6px;
    padding: 12px 14px 14px;
    background: rgba(18, 22, 28, 0.98);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.18s ease, transform 0.18s ease;
    z-index: 950;
}
.navbar.open .unlock-nav-panel {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
}
.unlock-nav-panel a {
    display: flex; align-items: center; gap: 10px;
    padding: 12px 14px; border-radius: 8px;
    color: var(--text-muted); font-size: 1rem; font-weight: 600;
    background: rgba(255, 255, 255, 0.03);
    text-decoration: none;
}
.unlock-nav-panel a:hover { color: #fff; background: rgba(255, 255, 255, 0.08); }
.unlock-nav-panel a i { width: 18px; text-align: center; color: var(--accent-blue); }

/* On desktop the unlock pages hide the slide-down panel and the hamburger;
   the nav-actions items show inline as normal. Threshold matches the
   .mobile-menu-btn visibility cutoff above (≤860px). */
@media (min-width: 861px) {
    .unlock-nav-panel { display: none; }
}

/* ----------------------------------------------------------------------------
   Drop-zone for the unlock pages: replaces the default <input type="file">
   chrome with a clickable / drag-and-drop area that shows the chosen file's
   name + size after pick. The <input> stays in the DOM (form submits it) but
   is visually hidden inside the label.
   ---------------------------------------------------------------------------- */
.drop-zone {
    display: block;
    position: relative;
    margin: 18px 0;
    padding: 28px 20px;
    background: var(--bg-code);
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    color: var(--text-main);
    text-align: center;
    cursor: pointer;
    transition: border-color 0.18s ease, background 0.18s ease, transform 0.12s ease;
}
.drop-zone:hover { border-color: var(--accent-blue); background: rgba(94, 198, 255, 0.04); }
.drop-zone.dragover {
    border-color: var(--accent-blue);
    background: rgba(94, 198, 255, 0.10);
    transform: scale(1.01);
}
.drop-zone.has-file { border-style: solid; border-color: var(--accent-blue); background: rgba(94, 198, 255, 0.05); }
.drop-zone input[type="file"] {
    position: absolute;
    width: 1px; height: 1px;
    opacity: 0; overflow: hidden;
    pointer-events: none;
}
.drop-zone-icon {
    font-size: 2rem;
    color: var(--accent-blue);
    margin-bottom: 8px;
    display: block;
}
.drop-zone-title { font-weight: 700; color: #fff; font-size: 1rem; line-height: 1.4; word-break: break-word; }
.drop-zone-hint  { font-size: 0.85rem; color: var(--text-muted); margin-top: 4px; }
.drop-zone-clear {
    position: absolute; top: 8px; right: 8px;
    width: 30px; height: 30px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-muted);
    cursor: pointer; padding: 0;
    display: inline-flex; align-items: center; justify-content: center;
    transition: 0.15s;
}
.drop-zone-clear:hover { background: rgba(255, 255, 255, 0.12); color: #fff; border-color: var(--accent-blue); }

/* Submit button on the unlock pages - was using .nav-link.primary (too small
   and visually wrong for a primary action). This is a proper full-width
   primary button. */
.btn-action {
    display: inline-flex; align-items: center; justify-content: center; gap: 10px;
    width: 100%;
    padding: 14px 20px;
    background: var(--accent-blue);
    color: #06131c;
    border: none; border-radius: 10px;
    font-weight: 700; font-size: 0.98rem; font-family: inherit;
    cursor: pointer;
    transition: 0.18s;
    box-sizing: border-box;
}
.btn-action:hover { background: #7ad2ff; transform: translateY(-1px); }
.btn-action:active { transform: translateY(0); }
.btn-action:disabled { opacity: 0.6; cursor: not-allowed; }

/* ----------------------------------------------------------------------------
   Shared docs footer - appears on docs.html and the unlock_* pages. Matches
   the home page footer-cta in spirit but slimmer since these pages aren't
   landing pages.
   ---------------------------------------------------------------------------- */
.docs-footer {
    margin-top: 80px;
    padding: 28px 20px;
    border-top: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.02);
    text-align: center;
}
.docs-footer .docs-footer-links {
    display: flex; flex-wrap: wrap; justify-content: center;
    gap: 8px 22px;
    margin-bottom: 10px;
}
.docs-footer .docs-footer-links a {
    color: var(--text-muted); text-decoration: none;
    font-size: 0.9rem; font-weight: 600;
    display: inline-flex; align-items: center; gap: 6px;
}
.docs-footer .docs-footer-links a:hover { color: #fff; }
.docs-footer .docs-footer-links i { color: var(--accent-blue); }
.docs-footer .docs-footer-meta { font-size: 0.82rem; color: var(--text-dim); }

/* Skip-to-content link - see style.css for the full rationale. Hidden until
   focused, then slides down so keyboard users can bypass the navbar. */
.skip-link {
    position: fixed; top: -40px; left: 12px;
    z-index: 1100;
    background: var(--accent-blue);
    color: #06131c;
    font-weight: 700; font-size: 0.9rem;
    padding: 8px 14px; border-radius: 0 0 8px 8px;
    text-decoration: none;
    transition: top 0.18s ease;
}
.skip-link:focus { top: 0; outline: 2px solid #fff; outline-offset: 2px; }