/* ==========================================================================
   KURD AI — ka-nav component ("Futuristic Glass v4" navigation standard)
   Wires the ka-* vocabulary used by resources/views/partials/nav.blade.php:
     .ka-nav, .ka-nav__shell, .ka-navlinks, .ka-navlinks__pill,
     .ka-navlink(.is-active), .ka-wordmark, .ka-gradient-text, .ka-icon-btn,
     .ka-burger, .ka-drawer, .ka-glass
   Same high-FPS glass / tech / FLIP treatment as kurdai-design.css.
   Pure presentation: no markup, logic or data is touched.

   v4 adds:
     • Animated aurora hairline along the nav's bottom edge when scrolled.
     • Conic aurora ring around the active FLIP pill + neon glow.
     • Glowing mobile drawer with aurora top edge, data-grid drift and
       staggered link entrance.
     • Icon buttons get a neon halo + specular edge on hover.
     • Wordmark neon aurora glow (composited only — no filter stacking).
   ========================================================================== */

/* ---------- tokens used by the nav partial's inline styles ---------- */
:root {
    --ka-brand-gradient: linear-gradient(120deg, #2563eb, #06b6d4, #7c3aed);
    --ka-line-soft: rgba(120, 140, 180, .18);
    --ka-ease: cubic-bezier(.22, 1, .36, 1);
    --ka-spring: cubic-bezier(.34, 1.56, .64, 1);
    --ka-glass-bg: rgba(255, 255, 255, .58);
    --ka-glass-brd: rgba(255, 255, 255, .70);
}

html.dark {
    --ka-line-soft: rgba(122, 152, 214, .16);
    --ka-glass-bg: rgba(17, 25, 42, .55);
    --ka-glass-brd: rgba(122, 152, 214, .16);
}

/* ---------- shell ---------- */
.ka-nav {
    position: sticky;
    top: 0;
    z-index: 50;
    background: color-mix(in srgb, var(--kai-canvas, #f5f7fb) 70%, transparent);
    -webkit-backdrop-filter: blur(22px) saturate(180%);
    backdrop-filter: blur(22px) saturate(180%);
    border-bottom: 1px solid transparent;
    transition:
        background-color .45s var(--ka-ease),
        border-color .45s var(--ka-ease),
        box-shadow .45s var(--ka-ease),
        padding .45s var(--ka-ease);
    contain: layout style;
}

/* micro-nodes baked into the glass itself (same trick as glass-cards) */
.ka-nav {
    background-image:
        radial-gradient(circle at 8% 50%,  var(--kai-nodule, rgba(37,99,235,.3)) 0 1.2px, transparent 2.5px),
        radial-gradient(circle at 94% 40%, var(--kai-nodule, rgba(37,99,235,.3)) 0 1.2px, transparent 2.5px);
    background-repeat: no-repeat, no-repeat;
}

/* condensed state toggled by kurdai-nav.js on scroll */
.ka-nav.kai-nav-scrolled {
    background-color: color-mix(in srgb, var(--kai-canvas, #f5f7fb) 88%, transparent);
    border-bottom-color: var(--ka-line-soft);
    box-shadow: 0 8px 30px -14px rgba(16, 24, 40, .22);
}

html.dark .ka-nav.kai-nav-scrolled {
    box-shadow: 0 10px 34px -14px rgba(0, 0, 0, .75);
}

/* ---- animated aurora hairline along the bottom edge (on scroll) ---- */
.ka-nav::after {
    content: '';
    position: absolute;
    bottom: -1px;
    inset-inline: 0;
    height: 1px;
    z-index: 1;
    pointer-events: none;
    background: linear-gradient(90deg,
        transparent 0%,
        var(--kai-aurora-1, rgba(37,99,235,.85)) 18%,
        var(--kai-aurora-2, rgba(6,182,212,.80)) 36%,
        var(--kai-aurora-3, rgba(124,58,237,.85)) 54%,
        var(--kai-aurora-4, rgba(236,72,153,.80)) 72%,
        transparent 100%);
    background-size: 220% auto;
    background-position: 0% center;
    opacity: 0;
    transition: opacity .5s var(--ka-ease);
}

.ka-nav.kai-nav-scrolled::after {
    opacity: 1;
    animation: kaAuroraFlow 9s linear infinite;
}

@keyframes kaAuroraFlow {
    to { background-position: 220% center; }
}

.ka-nav__shell {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding-block: .75rem;
}

.ka-nav.kai-nav-scrolled .ka-nav__shell { padding-block: .45rem; }

/* ---------- wordmark ---------- */
.ka-vt-logo img {
    transition: transform .5s var(--ka-spring);
}

/* exit flourish while the page veil fades (class set by kurdai-ui.js) */
.kai-vt .ka-vt-logo img {
    animation: kaVtLogo .7s var(--ka-spring) both;
}

@keyframes kaVtLogo {
    0%   { transform: rotate(0deg) scale(1); }
    40%  { transform: rotate(-10deg) scale(1.14); }
    100% { transform: rotate(0deg) scale(1); }
}

.ka-wordmark {
    transition: color .3s var(--ka-ease), text-shadow .3s var(--ka-ease);
}

.ka-vt-logo:hover .ka-wordmark {
    text-shadow: 0 0 24px color-mix(in srgb, var(--kai-brand-2, #06b6d4) 50%, transparent);
}

.ka-gradient-text {
    background: linear-gradient(110deg, var(--kai-brand-1, #2563eb), var(--kai-brand-2, #06b6d4), var(--kai-brand-3, #7c3aed));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    background-size: 220% auto;
    animation: kaGradShift 8s linear infinite;
}

@keyframes kaGradShift {
    to { background-position: 220% center; }
}

/* ---------- desktop link track + FLIP pill ---------- */
.ka-navlinks {
    position: relative;
    contain: layout style;
}

.ka-navlink {
    position: relative;
    z-index: 1;
    transition:
        color .3s var(--ka-ease),
        transform .4s var(--ka-spring),
        text-shadow .3s var(--ka-ease);
}

.ka-navlink:hover {
    transform: translateY(-1px);
    color: var(--kai-brand-1, #2563eb);
}

html.dark .ka-navlink:hover { color: #22d3ee; }

.ka-navlink.is-active {
    color: var(--kai-brand-1, #2563eb);
    text-shadow: 0 0 18px color-mix(in srgb, var(--kai-brand-1, #2563eb) 45%, transparent);
}

html.dark .ka-navlink.is-active { color: #22d3ee; }

.ka-navlink:focus-visible {
    outline: 2px solid var(--kai-brand-2, #06b6d4);
    outline-offset: 2px;
}

/* the FLIP pill — geometry is driven by kurdai-nav.js (placePill/morphPill);
   CSS owns only the surface + fade-in. v4 adds a conic aurora ring + glow. */
.ka-navlinks__pill {
    position: absolute;
    top: 0;
    left: 0;
    opacity: 0;
    z-index: 0;
    pointer-events: none;
    border-radius: 14px;
    background:
        linear-gradient(120deg, rgba(37, 99, 235, .12), rgba(6, 182, 212, .10), rgba(124, 58, 237, .12)),
        var(--ka-glass-bg);
    border: 1px solid var(--ka-glass-brd);
    box-shadow:
        0 4px 16px -6px rgba(16, 24, 40, .30),
        inset 0 1px 0 rgba(255, 255, 255, .45);
    transition: opacity .3s var(--ka-ease);
}

html.dark .ka-navlinks__pill {
    background:
        linear-gradient(120deg, rgba(56, 189, 248, .10), rgba(124, 58, 237, .10)),
        rgba(255, 255, 255, .06);
    box-shadow:
        inset 0 0 0 1px rgba(255, 255, 255, .10),
        0 4px 18px -6px rgba(0, 0, 0, .6);
}

.ka-navlinks__pill.kai-pill-on { opacity: 1; }

/* neon glow under the pill once it's live */
.ka-navlinks.kai-has-pill .ka-navlinks__pill.kai-pill-on {
    box-shadow:
        0 10px 26px -10px color-mix(in srgb, var(--kai-brand-3, #7c3aed) 45%, transparent),
        inset 0 1px 0 rgba(255, 255, 255, .45);
}

/* aurora conic ring hugging the pill (spin on hover) */
.ka-navlinks__pill::before {
    content: '';
    position: absolute;
    inset: -2px;
    border-radius: inherit;
    z-index: 0;
    padding: 2px;
    pointer-events: none;
    opacity: 0;
    transition: opacity .4s var(--ka-ease);
    background: conic-gradient(from 0deg,
        transparent 0%,
        var(--kai-aurora-1, rgba(37,99,235,.85)) 10%,
        var(--kai-aurora-2, rgba(6,182,212,.80)) 25%,
        var(--kai-aurora-3, rgba(124,58,237,.85)) 42%,
        transparent 52%,
        var(--kai-aurora-4, rgba(236,72,153,.80)) 66%,
        var(--kai-aurora-1, rgba(37,99,235,.85)) 82%,
        transparent 100%);
    -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
    mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    animation: kaRingSpin 5s linear infinite;
}

.ka-navlinks:hover .ka-navlinks__pill::before { opacity: 1; }

@keyframes kaRingSpin { to { transform: rotate(360deg); } }

/* ---------- icon buttons (lang / theme / profile / logout / burger) ---------- */
.ka-icon-btn {
    display: inline-flex;
    align-items: center;
    gap: .35rem;
    border-radius: 14px;
    background: var(--ka-glass-bg);
    border: 1px solid var(--ka-glass-brd);
    -webkit-backdrop-filter: blur(14px) saturate(160%);
    backdrop-filter: blur(14px) saturate(160%);
    box-shadow: var(--kai-shadow-1, 0 1px 2px rgba(16, 24, 40, .05));
    transition:
        transform .4s var(--ka-spring),
        box-shadow .4s var(--ka-ease),
        border-color .35s var(--ka-ease),
        color .3s var(--ka-ease),
        background-color .3s var(--ka-ease);
}

.ka-icon-btn:hover {
    transform: translateY(-2px);
    border-color: color-mix(in srgb, var(--kai-brand-2, #06b6d4) 45%, var(--ka-glass-brd));
    box-shadow:
        var(--kai-shadow-2, 0 24px 48px -20px rgba(16, 24, 40, .22)),
        0 10px 30px -12px color-mix(in srgb, var(--kai-brand-2, #06b6d4) 45%, transparent);
}

.ka-icon-btn:active { transform: translateY(-1px) scale(.97); }

#ka-burger svg {
    transition: transform .45s var(--ka-spring), color .3s var(--ka-ease);
}

/* burger → X state morph */
.ka-nav.is-open #ka-burger svg {
    transform: rotate(90deg) scale(.88);
}

.ka-theme-icon {
    display: inline-block;
    transition: transform .5s var(--ka-spring);
}

.ka-icon-btn:hover .ka-theme-icon { transform: rotate(25deg) scale(1.15); }

/* ---------- mobile drawer ---------- */
.ka-drawer-inner { display: none; }

.ka-glass {
    position: relative;
    background: var(--ka-glass-bg);
    border: 1px solid var(--ka-glass-brd);
    -webkit-backdrop-filter: blur(22px) saturate(180%);
    backdrop-filter: blur(22px) saturate(180%);
    box-shadow: var(--kai-shadow-2, 0 24px 48px -20px rgba(16, 24, 40, .22));
    overflow: hidden;
    isolation: isolate;
}

/* data-grid drift inside the drawer glass */
.ka-glass::before {
    content: '';
    position: absolute;
    inset: -22px;
    border-radius: inherit;
    z-index: -1;
    pointer-events: none;
    background-image:
        linear-gradient(to right, var(--kai-grid-line, rgba(120,140,180,.07)) 1px, transparent 1px),
        linear-gradient(to bottom, var(--kai-grid-line, rgba(120,140,180,.07)) 1px, transparent 1px);
    background-size: 22px 22px;
    animation: kaGridMove 16s var(--ka-ease) infinite;
}

@keyframes kaGridMove {
    from { transform: translate3d(0, 0, 0); }
    to   { transform: translate3d(22px, 22px, 0); }
}

/* aurora top edge on the drawer */
.ka-glass::after {
    content: '';
    position: absolute;
    top: 0;
    inset-inline: 0;
    height: 2px;
    z-index: 1;
    pointer-events: none;
    background: linear-gradient(90deg,
        var(--kai-aurora-1, rgba(37,99,235,.85)),
        var(--kai-aurora-2, rgba(6,182,212,.80)) 35%,
        var(--kai-aurora-3, rgba(124,58,237,.85)) 65%,
        var(--kai-aurora-4, rgba(236,72,153,.80)));
    background-size: 220% auto;
    animation: kaAuroraFlow 8s linear infinite;
    opacity: .9;
}

#ka-drawer { max-height: 0; }
#ka-drawer[aria-hidden="false"] { max-height: none; }

#ka-drawer a {
    position: relative;
    z-index: 1;
    transition:
        transform .3s var(--ka-spring),
        background-color .3s var(--ka-ease),
        color .3s var(--ka-ease),
        box-shadow .3s var(--ka-ease);
}

#ka-drawer a:hover { transform: translateY(-2px); }

/* active drawer link: brand gradient + aurora glow (bg is set inline) */
#ka-drawer a[style*="--ka-brand-gradient"] {
    box-shadow:
        0 12px 28px -10px color-mix(in srgb, var(--kai-brand-3, #7c3aed) 55%, transparent),
        0 0 0 1px rgba(255, 255, 255, .25);
}

/* staggered entrance for drawer links (JS toggles .ka-open on the drawer) */
#ka-drawer.ka-open a {
    animation: kaDrawerIn .45s var(--ka-ease) both;
    animation-delay: calc(var(--i, 0) * 34ms);
}

@keyframes kaDrawerIn {
    from { opacity: 0; transform: translateY(10px) scale(.98); }
    to   { opacity: 1; transform: none; }
}

/* ---------- motion accessibility ---------- */
@media (prefers-reduced-motion: reduce) {
    .ka-nav,
    .ka-nav__shell,
    .ka-navlinks__pill,
    .ka-icon-btn,
    .ka-navlink,
    .ka-wordmark {
        transition-duration: .001ms !important;
    }
    .ka-navlinks__pill { opacity: 1; }
    .ka-nav::after,
    .ka-navlinks__pill::before,
    .ka-glass::before,
    .ka-glass::after,
    #ka-drawer.ka-open a { animation: none; }
    .kai-vt .ka-vt-logo img { animation: none; }
    .ka-gradient-text { animation: none; }
}

html.kai-perf .ka-navlinks__pill::before,
html.kai-perf .ka-glass::before,
html.kai-perf .ka-glass::after { animation: none; }
html.kai-perf .ka-nav::after { animation: none; }