/* ==========================================================================
   Demo Kit — shared component primitives for the newer /demos walkthroughs.
   Loaded AFTER demo-ui.css. Each demo scopes tokens on its root class:

     .myapp { --bg:…; --panel:…; --ink:…; --muted:…; --line:…;
              --brand:…; --brand2:…; --radius:16px; }

   Classes are prefixed k- and inherit the app palette, so one stylesheet
   serves many visually distinct demos.
   ========================================================================== */

.k-app {
    --radius: 16px;
    --brand: #6366f1;
    --brand2: #8b5cf6;
    --bg: #f6f7fb;
    --panel: #ffffff;
    --panel2: #f1f2f7;
    --ink: #0f172a;
    --muted: #64748b;
    --line: #e2e8f0;
    background: var(--bg);
    color: var(--ink);
    min-height: 100vh;
    font: 400 15px/1.55 Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
    -webkit-font-smoothing: antialiased;
}

.k-wrap { max-width: 1180px; margin: 0 auto; padding: 0 1.25rem; }

/* ---- Mobile safety net (shared by the whole kit family) --------------- */
.k-app img, .k-app svg, .k-app video, .k-app canvas { max-width: 100%; height: auto; }
.k-app pre { max-width: 100%; overflow-x: auto; white-space: pre-wrap; word-break: break-word; }
.k-field input, .k-field select, .k-field textarea { width: 100%; max-width: 100%; }
.k-table-wrap { max-width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; }
@media (max-width: 620px) {
    .k-topbar { flex-wrap: wrap; gap: .6rem; }
    .k-topbar nav { margin-left: 0; width: 100%; flex-wrap: nowrap; overflow-x: auto; scrollbar-width: none; }
    .k-topbar nav::-webkit-scrollbar { display: none; }
    .k-field-row { grid-template-columns: 1fr; }
    .k-wrap { padding: 0 1rem; }
    .k-card { overflow-x: auto; }
    .k-btn { white-space: normal; }
    .k-tabs { display: flex; width: 100%; flex-wrap: nowrap; overflow-x: auto; scrollbar-width: none; }
    .k-tabs::-webkit-scrollbar { display: none; }
}

/* ---- Topbar ------------------------------------------------------------ */
.k-topbar {
    position: sticky; top: 41px; z-index: 50;
    display: flex; align-items: center; gap: 1rem;
    padding: .8rem 1.25rem;
    background: color-mix(in srgb, var(--panel) 86%, transparent);
    backdrop-filter: saturate(150%) blur(10px);
    border-bottom: 1px solid var(--line);
}
.k-brand { display: flex; align-items: center; gap: .65rem; font-weight: 800; letter-spacing: -.01em; }
.k-brand .k-logo {
    width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center;
    background: linear-gradient(135deg, var(--brand), var(--brand2)); color: #fff; font-size: 1.05rem;
    box-shadow: 0 6px 14px -6px color-mix(in srgb, var(--brand) 70%, transparent);
}
.k-brand small { display: block; font-weight: 500; color: var(--muted); font-size: .72rem; letter-spacing: .02em; }
.k-topbar nav { display: flex; gap: .25rem; margin-left: auto; flex-wrap: wrap; }
.k-navbtn {
    border: 0; background: transparent; color: var(--muted); cursor: pointer;
    font: 600 .83rem/1 inherit; padding: .5rem .8rem; border-radius: 9px;
    transition: background .18s, color .18s;
}
.k-navbtn:hover { background: var(--panel2); color: var(--ink); }
.k-navbtn.active { background: color-mix(in srgb, var(--brand) 12%, transparent); color: var(--brand); }

/* ---- Buttons / chips ---------------------------------------------------- */
.k-btn {
    display: inline-flex; align-items: center; justify-content: center; gap: .45rem;
    border: 0; cursor: pointer; border-radius: 11px; padding: .62rem 1.1rem;
    font: 700 .85rem/1 inherit; color: #fff;
    background: linear-gradient(135deg, var(--brand), var(--brand2));
    box-shadow: 0 8px 18px -8px color-mix(in srgb, var(--brand) 75%, transparent);
    transition: transform .14s var(--ds-ease, ease), box-shadow .2s, filter .2s;
}
.k-btn:hover { filter: brightness(1.06); transform: translateY(-1px); }
.k-btn:active { transform: translateY(0) scale(.98); }
.k-btn.ghost {
    background: var(--panel); color: var(--ink);
    border: 1px solid var(--line); box-shadow: none;
}
.k-btn.ghost:hover { border-color: var(--brand); color: var(--brand); }
.k-btn.sm { padding: .4rem .75rem; font-size: .78rem; border-radius: 9px; }

.k-chip {
    display: inline-flex; align-items: center; gap: .3rem;
    font: 700 .68rem/1 inherit; letter-spacing: .04em; text-transform: uppercase;
    padding: .32rem .6rem; border-radius: 999px;
    background: color-mix(in srgb, var(--brand) 12%, transparent); color: var(--brand);
}
.k-chip.ok { background: #10b98122; color: #059669; }
.k-chip.warn { background: #f59e0b22; color: #b45309; }
.k-chip.bad { background: #ef444422; color: #dc2626; }
.k-chip.dim { background: var(--panel2); color: var(--muted); }

/* ---- Cards / grids ------------------------------------------------------ */
.k-grid { display: grid; gap: 1rem; }
.k-cols-2 { grid-template-columns: repeat(2, 1fr); }
.k-cols-3 { grid-template-columns: repeat(3, 1fr); }
.k-cols-4 { grid-template-columns: repeat(4, 1fr); }
.k-side { display: grid; grid-template-columns: 300px minmax(0, 1fr); gap: 1rem; align-items: start; }
.k-side-r { display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: 1rem; align-items: start; }
/* grid children must be allowed to shrink below their content's min width */
.k-grid > *, .k-side > *, .k-side-r > * { min-width: 0; }
@media (max-width: 900px) {
    .k-cols-3, .k-cols-4 { grid-template-columns: repeat(2, 1fr); }
    /* !important so inline `style="grid-template-columns:…"` overrides still collapse */
    .k-side, .k-side-r { grid-template-columns: minmax(0, 1fr) !important; }
}
@media (max-width: 560px) { .k-cols-2, .k-cols-3, .k-cols-4 { grid-template-columns: 1fr; } }

.k-card {
    background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
    padding: 1.1rem 1.2rem; box-shadow: 0 1px 2px rgba(15,23,42,.04);
}
.k-card h3 { margin: 0 0 .2rem; font-size: .95rem; font-weight: 800; letter-spacing: -.01em; }
.k-card .k-sub { color: var(--muted); font-size: .8rem; margin: 0 0 .9rem; }

.k-stat { position: relative; overflow: hidden; }
.k-stat .k-stat-label { color: var(--muted); font-size: .74rem; font-weight: 700; letter-spacing: .05em; text-transform: uppercase; }
.k-stat .k-stat-num { font-size: 1.7rem; font-weight: 800; letter-spacing: -.03em; margin: .25rem 0 .15rem; font-variant-numeric: tabular-nums; }
.k-stat .k-stat-trend { font-size: .75rem; font-weight: 700; }
.k-stat .k-stat-trend.up { color: #059669; } .k-stat .k-stat-trend.down { color: #dc2626; }
.k-stat::after {
    content: ""; position: absolute; inset: auto -20% -55% 40%;
    height: 120%; border-radius: 50%;
    background: radial-gradient(closest-side, color-mix(in srgb, var(--brand) 14%, transparent), transparent);
    pointer-events: none;
}

/* ---- Hero ---------------------------------------------------------------- */
.k-hero {
    position: relative; overflow: hidden; border-radius: calc(var(--radius) + 6px);
    padding: clamp(2rem, 5vw, 4rem) clamp(1.4rem, 4vw, 3rem);
    background: linear-gradient(120deg, var(--brand), var(--brand2));
    color: #fff; margin-bottom: 1.25rem;
}
.k-hero::before {
    content: ""; position: absolute; inset: 0;
    background:
        radial-gradient(600px 260px at 85% -10%, rgba(255,255,255,.22), transparent 60%),
        radial-gradient(500px 300px at -10% 110%, rgba(0,0,0,.18), transparent 60%);
    pointer-events: none;
}
.k-hero > * { position: relative; }
.k-hero h1 { margin: 0 0 .6rem; font-size: clamp(1.6rem, 3.6vw, 2.6rem); font-weight: 800; letter-spacing: -.03em; line-height: 1.12; }
.k-hero p { margin: 0 0 1.2rem; max-width: 56ch; opacity: .92; }
.k-hero .k-btn { background: #fff; color: var(--brand); box-shadow: 0 10px 24px -10px rgba(0,0,0,.35); }
.k-hero .k-btn.ghost { background: rgba(255,255,255,.14); color: #fff; border-color: rgba(255,255,255,.35); }

/* ---- Forms ---------------------------------------------------------------- */
.k-field { display: flex; flex-direction: column; gap: .3rem; margin-bottom: .75rem; }
.k-field label { font: 700 .72rem/1 inherit; letter-spacing: .05em; text-transform: uppercase; color: var(--muted); }
.k-field input, .k-field select, .k-field textarea {
    border: 1px solid var(--line); background: var(--panel); color: var(--ink);
    border-radius: 10px; padding: .55rem .7rem; font: 500 .88rem/1.3 inherit; outline: none;
    transition: border-color .15s, box-shadow .15s;
}
.k-field input:focus, .k-field select:focus, .k-field textarea:focus {
    border-color: var(--brand); box-shadow: 0 0 0 3px color-mix(in srgb, var(--brand) 18%, transparent);
}
.k-field-row { display: grid; grid-template-columns: 1fr 1fr; gap: .7rem; }

/* ---- Table ----------------------------------------------------------------- */
.k-table { width: 100%; border-collapse: collapse; font-size: .85rem; }
.k-table th {
    text-align: left; font: 700 .68rem/1 inherit; letter-spacing: .06em; text-transform: uppercase;
    color: var(--muted); padding: .55rem .6rem; border-bottom: 1px solid var(--line);
}
.k-table td { padding: .6rem; border-bottom: 1px solid var(--line); }
.k-table tr:last-child td { border-bottom: 0; }
.k-table tr:hover td { background: var(--panel2); }

/* ---- List rows -------------------------------------------------------------- */
.k-row { display: flex; align-items: center; gap: .8rem; padding: .7rem .2rem; border-bottom: 1px solid var(--line); }
.k-row:last-child { border-bottom: 0; }
.k-row .k-ava {
    width: 38px; height: 38px; border-radius: 12px; flex: none; display: grid; place-items: center;
    background: color-mix(in srgb, var(--brand) 12%, transparent); color: var(--brand); font-weight: 800;
}
.k-row .k-row-main { flex: 1; min-width: 0; }
.k-row .k-row-main b { display: block; font-size: .88rem; }
.k-row .k-row-main small { color: var(--muted); font-size: .76rem; }

/* ---- Tabs / segmented --------------------------------------------------------- */
.k-tabs { display: inline-flex; gap: 3px; padding: 3px; background: var(--panel2); border-radius: 12px; margin-bottom: 1rem; flex-wrap: wrap; }
.k-tabs button {
    border: 0; background: transparent; color: var(--muted); cursor: pointer;
    font: 700 .8rem/1 inherit; padding: .5rem .95rem; border-radius: 9px; transition: all .16s;
}
.k-tabs button.active { background: var(--panel); color: var(--ink); box-shadow: 0 2px 6px rgba(15,23,42,.08); }

/* ---- Progress / meters --------------------------------------------------------- */
.k-meter { height: 8px; border-radius: 999px; background: var(--panel2); overflow: hidden; }
.k-meter > i {
    display: block; height: 100%; border-radius: inherit;
    background: linear-gradient(90deg, var(--brand), var(--brand2));
    transition: width .5s var(--ds-ease, ease);
}

/* ---- Timeline ------------------------------------------------------------------- */
.k-tl { position: relative; padding-left: 1.4rem; }
.k-tl::before { content: ""; position: absolute; left: 5px; top: 6px; bottom: 6px; width: 2px; background: var(--line); }
.k-tl-item { position: relative; padding: 0 0 1.1rem; }
.k-tl-item::before {
    content: ""; position: absolute; left: -1.4rem; top: 4px; width: 12px; height: 12px; border-radius: 50%;
    background: var(--panel); border: 3px solid var(--brand);
}
.k-tl-item.done::before { background: var(--brand); }
.k-tl-item b { font-size: .88rem; } .k-tl-item small { display: block; color: var(--muted); font-size: .76rem; }

/* ---- Toast ------------------------------------------------------------------------ */
.k-toast {
    position: fixed; bottom: 1.2rem; left: 50%; transform: translateX(-50%) translateY(20px);
    background: #0f172a; color: #fff; font: 600 .85rem/1.2 inherit;
    padding: .75rem 1.2rem; border-radius: 12px; box-shadow: 0 18px 40px -12px rgba(0,0,0,.5);
    opacity: 0; pointer-events: none; transition: all .3s var(--ds-ease, ease); z-index: 500;
}
.k-toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---- Misc ------------------------------------------------------------------------- */
.k-page { padding: 1.4rem 0 3rem; }
.k-h { font-size: 1.25rem; font-weight: 800; letter-spacing: -.02em; margin: 0 0 .15rem; }
.k-muted { color: var(--muted); font-size: .84rem; margin: 0 0 1.1rem; }
.k-view[hidden] { display: none; }
.k-empty {
    border: 1.5px dashed var(--line); border-radius: var(--radius); color: var(--muted);
    padding: 2rem; text-align: center; font-size: .86rem;
}