/* ========================================================================
   drona-brain.css
   Act A — The Regulatory Brain (Revision Round 1 — "Specimen on Navy")

   Concept: cream paper = structured truth (the brand's answer); navy void
   = the unresolved black-box. Each failure-mode tab is a bento card; the
   active one flips from navy-glass to cream paper, visually becoming the
   "With Drona" answer. A red hairline traces from the active chip across
   to the cream paper card — provenance, drawn.
   ======================================================================== */

/* ---------- Section-scoped palette ---------- */
.kl-drona {
    --kl-navy:     #0a2f52;          /* main blue — matches body, no step-down */
    --kl-navy-2:   #224d78;          /* subtler blue — hover/active layered surfaces */
    --kl-cream:    #f4ebd0;          /* secondary white — text on navy */
    --kl-cream-2:  #f7f5ee;          /* subtler white — With Drona paper card */
    --kl-orange:   #db4a2b;          /* accent — active rule, indices, trace ink */
}

/* ---------- Section ---------- */
.kl-drona {
    position: relative;
    width: 100%;
    box-sizing: border-box;
    background: transparent;
    color: var(--kl-cream);
    padding: clamp(96px, 11vw, 156px) clamp(16px, 4vw, 40px);
    overflow: hidden;
    z-index: 1;
}

/* Faint paper-grain on navy — adds atmospheric tooth */
.kl-drona::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.96  0 0 0 0 0.92  0 0 0 0 0.82  0 0 0 0.04 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
    background-size: 160px 160px;
    mix-blend-mode: overlay;
    opacity: 0.55;
    pointer-events: none;
    z-index: 1;
}

.kl-drona__inner {
    position: relative;
    z-index: 2;
    max-width: 1280px;
    margin: 0 auto;
}

/* ---------- Header ---------- */
.kl-drona__header {
    max-width: 880px;
    margin: 0 auto clamp(56px, 7vw, 88px);
    text-align: center;
}

.kl-drona__eyebrow {
    display: inline-block;
    font-family: 'Inter', system-ui, sans-serif;
    font-size: 0.625rem;
    font-weight: 600;
    letter-spacing: 0.32em;
    text-transform: uppercase;
    color: rgba(244, 235, 208, 0.42);
    margin-bottom: 1.2rem;
}

.kl-drona__title {
    font-family: 'Cormorant Garamond', Georgia, serif;
    font-weight: 400;
    font-style: italic;
    font-size: clamp(1.85rem, 3.8vw, 2.9rem);
    line-height: 1.12;
    letter-spacing: -0.01em;
    color: var(--kl-cream);
    margin: 0;
}

.kl-drona__title em {
    font-style: normal;
    color: var(--kl-orange);
}

/* ---------- Stage: two-column ---------- */
.kl-drona__stage {
    display: grid;
    grid-template-columns: minmax(320px, 0.95fr) 1.35fr;
    gap: clamp(28px, 3.4vw, 52px);
    align-items: start;
    position: relative;
}

/* ---------- Left rail: bento chips ---------- */
.kl-drona__tabs {
    display: flex;
    flex-direction: column;
    gap: clamp(10px, 1.2vw, 14px);
    role: tablist;
}

.kl-drona__tab {
    appearance: none;
    position: relative;
    display: grid;
    grid-template-columns: auto 1fr;
    align-items: center;
    column-gap: 1rem;
    width: 100%;
    text-align: left;
    padding: clamp(1rem, 1.6vw, 1.25rem) clamp(1.1rem, 1.8vw, 1.4rem);
    min-height: 88px;
    cursor: pointer;
    color: rgba(244, 235, 208, 0.72);
    font-family: 'Cormorant Garamond', Georgia, serif;
    font-style: italic;
    font-size: clamp(1rem, 1.18vw, 1.12rem);
    line-height: 1.4;
    letter-spacing: -0.005em;

    /* Bento card surface */
    background: rgba(34, 77, 120, 0.18);
    border: 1px solid rgba(244, 235, 208, 0.12);
    border-left: 2px solid transparent;
    transition:
        background 320ms ease,
        border-color 320ms ease,
        color 320ms ease,
        box-shadow 320ms ease,
        transform 320ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* Hover — bring the navy-2 layer forward */
.kl-drona__tab:hover {
    background: rgba(34, 77, 120, 0.55);
    border-color: rgba(244, 235, 208, 0.22);
    color: var(--kl-cream);
    transform: translateX(2px);
}

/* Focus visible for keyboard users */
.kl-drona__tab:focus-visible {
    outline: 2px solid var(--kl-orange);
    outline-offset: 3px;
}

/* Active — solid navy-2 card with orange left rule + cream type */
.kl-drona__tab[aria-selected="true"] {
    background: var(--kl-navy-2);
    border-color: rgba(244, 235, 208, 0.28);
    border-left-color: var(--kl-orange);
    color: var(--kl-cream);
    box-shadow:
        0 14px 36px -16px rgba(0, 0, 0, 0.55),
        inset 0 0 0 1px rgba(244, 235, 208, 0.06);
}

.kl-drona__tab-index {
    display: inline-block;
    font-family: 'Inter', system-ui, sans-serif;
    font-style: normal;
    font-size: 0.62rem;
    font-weight: 600;
    letter-spacing: 0.28em;
    color: rgba(244, 235, 208, 0.38);
    align-self: start;
    margin-top: 0.18em;
    transition: color 320ms ease;
}

.kl-drona__tab:hover .kl-drona__tab-index {
    color: rgba(244, 235, 208, 0.7);
}

.kl-drona__tab[aria-selected="true"] .kl-drona__tab-index {
    color: var(--kl-orange);
}

/* Desktop-only trace ink: red hairline from active chip's right edge */
@media (min-width: 1024px) {
    .kl-drona__tab[aria-selected="true"]::after {
        content: '';
        position: absolute;
        right: -1px;
        top: 50%;
        width: clamp(28px, 3.4vw, 52px);
        height: 1px;
        background: var(--kl-orange);
        transform: translate(100%, -50%);
        pointer-events: none;
        z-index: 3;
    }
    /* Hover preview at half opacity */
    .kl-drona__tab:hover:not([aria-selected="true"])::after {
        content: '';
        position: absolute;
        right: -1px;
        top: 50%;
        width: clamp(28px, 3.4vw, 52px);
        height: 1px;
        background: var(--kl-orange);
        opacity: 0.4;
        transform: translate(100%, -50%);
        pointer-events: none;
        z-index: 3;
    }
}

/* ---------- Right side: two contrast cards ---------- */
.kl-drona__panels {
    display: flex;
    flex-direction: column;
    gap: clamp(18px, 2.2vw, 28px);
    align-self: stretch;
}

.kl-drona__panel {
    position: relative;
    padding: clamp(1.5rem, 2.4vw, 2.1rem);
    box-sizing: border-box;
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: 168px;
    overflow: hidden;
    transition: opacity 320ms ease, transform 320ms ease;
}

/* Without Drona — dashed outline ghost on a whisper of navy-2 */
.kl-drona__panel[data-state="without"] {
    background: rgba(34, 77, 120, 0.18);
    border: 1px dashed rgba(244, 235, 208, 0.32);
    color: rgba(244, 235, 208, 0.62);
}

/* With Drona — cream paper card. The only warm surface in the section. */
.kl-drona__panel[data-state="with"] {
    background: var(--kl-cream-2);
    border: 1px solid rgba(10, 47, 82, 0.12);
    color: var(--kl-navy);
    box-shadow: 0 22px 50px -20px rgba(0, 0, 0, 0.45);
}

/* Paper grain inside the With Drona card */
.kl-drona__panel[data-state="with"]::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.42  0 0 0 0 0.28  0 0 0 0 0.14  0 0 0 0.06 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
    background-size: 160px 160px;
    mix-blend-mode: multiply;
    opacity: 0.55;
    pointer-events: none;
    z-index: 0;
}

/* Top rule for With Drona — the "answer line" in orange */
.kl-drona__panel[data-state="with"]::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--kl-orange);
    z-index: 1;
}

.kl-drona__panel-label {
    position: relative;
    z-index: 2;
    display: block;
    font-family: 'Inter', system-ui, sans-serif;
    font-size: 0.62rem;
    font-weight: 600;
    letter-spacing: 0.32em;
    text-transform: uppercase;
    margin-bottom: 1rem;
}

.kl-drona__panel[data-state="without"] .kl-drona__panel-label {
    color: rgba(244, 235, 208, 0.42);
}

.kl-drona__panel[data-state="with"] .kl-drona__panel-label {
    color: var(--kl-orange);
}

.kl-drona__panel-body {
    position: relative;
    z-index: 2;
    margin: 0;
    font-family: 'Cormorant Garamond', Georgia, serif;
    font-style: italic;
    font-size: clamp(1.05rem, 1.4vw, 1.3rem);
    line-height: 1.5;
    letter-spacing: -0.005em;
}

.kl-drona__panel[data-state="with"] .kl-drona__panel-body {
    color: var(--kl-navy);
}

.kl-drona__panel-body em {
    font-style: normal;
    font-weight: 500;
}

.kl-drona__panel[data-state="without"] .kl-drona__panel-body em {
    color: var(--kl-cream);
    background: linear-gradient(180deg, transparent 62%, rgba(219, 74, 43, 0.22) 62%);
    padding: 0 0.12em;
}

.kl-drona__panel[data-state="with"] .kl-drona__panel-body em {
    color: var(--kl-navy);
    background: linear-gradient(180deg, transparent 62%, rgba(219, 74, 43, 0.28) 62%);
    padding: 0 0.12em;
}

/* Cross-fade animation for panel content swap */
.kl-drona__panel.is-swapping .kl-drona__panel-body,
.kl-drona__panel.is-swapping .kl-drona__panel-label {
    opacity: 0;
    transform: translateY(4px);
}

.kl-drona__panel-body,
.kl-drona__panel-label {
    transition: opacity 220ms ease, transform 220ms ease;
}

/* ---------- Closing line ---------- */
.kl-drona__close {
    margin: clamp(48px, 6vw, 72px) auto 0;
    text-align: center;
    max-width: 720px;
}

.kl-drona__close-line {
    font-family: 'Cormorant Garamond', Georgia, serif;
    font-style: italic;
    font-size: clamp(1.1rem, 1.8vw, 1.45rem);
    color: rgba(244, 235, 208, 0.82);
    line-height: 1.5;
    margin: 0;
    letter-spacing: -0.005em;
}

.kl-drona__close-line::before,
.kl-drona__close-line::after {
    content: '';
    display: inline-block;
    width: 18px;
    height: 1px;
    background: rgba(244, 235, 208, 0.32);
    vertical-align: middle;
    margin: 0 0.9rem;
}

/* ---------- Entrance state (JS sets is-in) ---------- */
.kl-drona__header,
.kl-drona__stage,
.kl-drona__close {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 800ms ease, transform 800ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.kl-drona.is-in .kl-drona__header { transition-delay: 0ms;   opacity: 1; transform: none; }
.kl-drona.is-in .kl-drona__stage  { transition-delay: 150ms; opacity: 1; transform: none; }
.kl-drona.is-in .kl-drona__close  { transition-delay: 320ms; opacity: 1; transform: none; }

/* ========================================================================
   RESPONSIVE — Tablet portrait & mobile
   Single column. The panel block re-orders to sit directly below the
   active tab chip via a JS-set custom property on the section root.
   ======================================================================== */

@media (max-width: 1023px) {
    .kl-drona__stage {
        grid-template-columns: 1fr;
        gap: clamp(14px, 2vw, 18px);
    }

    .kl-drona__tabs {
        display: contents;     /* let each chip + the panel block share the grid */
    }

    .kl-drona__tab {
        order: var(--drona-tab-order, 0);
        min-height: 72px;
        font-size: clamp(0.98rem, 2.4vw, 1.05rem);
        grid-template-columns: auto 1fr auto; /* add chevron column */
    }

    /* Chevron — CSS-drawn downward arrow */
    .kl-drona__chevron {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 20px;
        height: 20px;
        align-self: center;
        flex-shrink: 0;
        transition: transform 320ms ease;
    }

    .kl-drona__chevron::before {
        content: '';
        display: block;
        width: 7px;
        height: 7px;
        border-right: 1.5px solid rgba(244, 235, 208, 0.38);
        border-bottom: 1.5px solid rgba(244, 235, 208, 0.38);
        transform: rotate(45deg) translate(-1px, -2px);
        transition: border-color 320ms ease;
    }

    .kl-drona__tab[aria-selected="true"] .kl-drona__chevron {
        transform: rotate(180deg);
    }

    .kl-drona__tab[aria-selected="true"] .kl-drona__chevron::before {
        border-color: var(--kl-orange);
    }

    /* Panels collapsed by default; revealed when section carries has-active-tab */
    .kl-drona__panels {
        display: none;
    }

    .kl-drona.has-active-tab .kl-drona__panels {
        display: flex;
        animation: drona-panel-in 240ms ease forwards;
    }

    /* Order assignment — chips spaced by 2, so the panel block can slot
       cleanly between any two chips at an odd-integer order. */
    .kl-drona__tab[data-drona-tab="0"] { --drona-tab-order: 0; }
    .kl-drona__tab[data-drona-tab="1"] { --drona-tab-order: 2; }
    .kl-drona__tab[data-drona-tab="2"] { --drona-tab-order: 4; }
    .kl-drona__tab[data-drona-tab="3"] { --drona-tab-order: 6; }

    /* The panel block slots in immediately after the active chip.
       JS writes --drona-active-order to <section root> on every tab change. */
    .kl-drona__panels {
        order: var(--drona-active-order, 1);
        gap: clamp(14px, 2vw, 18px);
        margin: clamp(6px, 1.4vw, 10px) 0 clamp(10px, 1.8vw, 14px);
    }

    /* Active chip becomes a cream paper card on small screens too —
       it visually links to the With Drona panel below it. */
    .kl-drona__tab[aria-selected="true"] {
        background: var(--kl-cream-2);
        border-color: rgba(10, 47, 82, 0.14);
        border-left-color: var(--kl-orange);
        color: var(--kl-navy);
        box-shadow: 0 14px 30px -16px rgba(0, 0, 0, 0.45);
    }

    .kl-drona__tab[aria-selected="true"] .kl-drona__tab-index {
        color: var(--kl-orange);
    }
}

@media (max-width: 640px) {
    .kl-drona {
        padding: clamp(64px, 14vw, 96px) clamp(14px, 4vw, 22px);
    }

    .kl-drona__title {
        font-size: clamp(1.55rem, 6.5vw, 1.95rem);
    }
    .kl-drona__title br { display: none; }

    /* Mobile chip: switch from italic serif to Inter for readability at small sizes */
    .kl-drona__tab {
        min-height: 64px;
        padding: 0.95rem 1.05rem;
        column-gap: 0.85rem;
        font-family: 'Inter', system-ui, sans-serif;
        font-style: normal;
        font-size: 0.95rem;
        line-height: 1.45;
        letter-spacing: -0.005em;
    }

    .kl-drona__panel {
        padding: clamp(1.05rem, 4.5vw, 1.4rem);
        min-height: 148px;
    }

    .kl-drona__panel-body {
        font-size: 1rem;
        line-height: 1.5;
    }

    .kl-drona__close-line {
        font-size: 1rem;
    }
    .kl-drona__close-line::before,
    .kl-drona__close-line::after {
        width: 12px;
        margin: 0 0.6rem;
    }
}

/* Chevron hidden on desktop */
@media (min-width: 1024px) {
    .kl-drona__chevron { display: none; }
}

/* ---------- Mobile accordion panel entrance ---------- */
@keyframes drona-panel-in {
    from { opacity: 0; transform: translateY(-6px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
    .kl-drona.has-active-tab .kl-drona__panels {
        animation: none;
    }

    .kl-drona__header,
    .kl-drona__stage,
    .kl-drona__close,
    .kl-drona__panel,
    .kl-drona__panel-body,
    .kl-drona__panel-label,
    .kl-drona__tab {
        transition: none !important;
        transform: none !important;
    }

    .kl-drona__header,
    .kl-drona__stage,
    .kl-drona__close {
        opacity: 1 !important;
    }
}