:root {
  --bg: #f4f5f7; --panel: #ffffff; --panel-2: #f9fafb; --line: #e3e6ea; --line-2: #d0d5dc;
  --text: #16191d; --muted: #5d6671; --faint: #8a939e;
  --accent: #1f6feb; --accent-2: #174ea6; --accent-bg: #e8f0fe;
  --ok: #1a7f37; --ok-bg: #e6f4ea; --warn: #9a6700; --warn-bg: #fff4d6; --bad: #c62828; --bad-bg: #fdecea;
  --side: #111418; --side-text: #c5ccd4; --side-hover: #1d2228; --side-active: #252b33;
  --mono: ui-monospace, "Cascadia Mono", "SF Mono", Consolas, monospace;
  --r: 8px; --shadow: 0 1px 2px rgba(16,24,40,.06), 0 1px 3px rgba(16,24,40,.08);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0e1116; --panel: #161b22; --panel-2: #1b2129; --line: #2a313b; --line-2: #36404c;
    --text: #e6eaef; --muted: #9aa4b0; --faint: #6f7a86;
    --accent: #4c8dff; --accent-2: #79a8ff; --accent-bg: #16233a;
    --ok: #4ac26b; --ok-bg: #12261a; --warn: #d4a72c; --warn-bg: #2a220e; --bad: #ff6b6b; --bad-bg: #2c1515;
    --side: #0a0d11; --side-hover: #151a20; --side-active: #1c232b;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body { background: var(--bg); color: var(--text); font: 14px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
a { color: var(--accent); text-decoration: none; }
button, input, select, textarea { font: inherit; color: inherit; }
.mono { font-family: var(--mono); }
.muted { color: var(--muted); } .faint { color: var(--faint); }
.hidden { display: none !important; }

/* ---------- layout */
.app { display: grid; grid-template-columns: 228px 1fr; min-height: 100vh; }
.side { background: var(--side); color: var(--side-text); display: flex; flex-direction: column; padding: 16px 10px; position: sticky; top: 0; height: 100vh; }
.brand { display: flex; align-items: center; gap: 10px; padding: 4px 8px 18px; }
.brand-mark { width: 30px; height: 30px; border-radius: 7px; background: linear-gradient(135deg, #1f6feb, #0b3d91); display: grid; place-items: center; font: 700 13px var(--mono); color: #fff; letter-spacing: -.5px; }
.brand b { color: #fff; font-size: 14px; letter-spacing: .4px; display: block; }
.brand span { font-size: 11px; color: #7f8a96; }
.nav { display: flex; flex-direction: column; gap: 2px; flex: 1; overflow-y: auto; }
.nav-sec { font-size: 10.5px; text-transform: uppercase; letter-spacing: .8px; color: #6b7682; padding: 14px 10px 4px; }
.nav a { color: var(--side-text); padding: 7px 10px; border-radius: 6px; display: flex; align-items: center; gap: 9px; }
.nav a:hover { background: var(--side-hover); color: #fff; }
.nav a.on { background: var(--side-active); color: #fff; box-shadow: inset 2px 0 0 var(--accent); }
.nav .ico { width: 16px; text-align: center; opacity: .8; font-size: 13px; }
.side-foot { border-top: 1px solid #222931; padding: 10px 8px 0; font-size: 12px; color: #8b95a1; }
.side-foot button { background: none; border: 0; color: #aab3bd; cursor: pointer; padding: 0; }
.side-foot button:hover { color: #fff; }
.main { padding: 22px 28px 60px; min-width: 0; }
.head { display: flex; align-items: flex-end; justify-content: space-between; gap: 12px; margin-bottom: 18px; flex-wrap: wrap; }
.head h1 { font-size: 20px; margin: 0; letter-spacing: -.2px; }
.head p { margin: 3px 0 0; color: var(--muted); }
.menu-btn { display: none; }

/* ---------- componentes */
.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--r); box-shadow: var(--shadow); }
.card-h { padding: 12px 16px; border-bottom: 1px solid var(--line); display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.card-h h2 { font-size: 14px; margin: 0; }
.card-b { padding: 16px; }
.grid { display: grid; gap: 14px; }
.g2 { grid-template-columns: repeat(2, minmax(0, 1fr)); } .g3 { grid-template-columns: repeat(3, minmax(0, 1fr)); } .g4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.kpi { padding: 14px 16px; }
.kpi .v { font-size: 26px; font-weight: 650; letter-spacing: -.5px; font-variant-numeric: tabular-nums; }
.kpi .l { color: var(--muted); font-size: 12.5px; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; border: 1px solid var(--line-2); background: var(--panel); padding: 7px 12px; border-radius: 7px; cursor: pointer; font-weight: 550; white-space: nowrap; }
.btn:hover { border-color: var(--faint); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn.pri { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.pri:hover { background: var(--accent-2); }
.btn.ok { background: var(--ok); border-color: var(--ok); color: #fff; }
.btn.bad { color: var(--bad); }
.btn.sm { padding: 4px 9px; font-size: 12.5px; }
.btn.ghost { border-color: transparent; background: transparent; }
.row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.spacer { flex: 1; }
label.f { display: flex; flex-direction: column; gap: 4px; font-size: 12.5px; color: var(--muted); font-weight: 550; }
input.i, select.i, textarea.i { border: 1px solid var(--line-2); background: var(--panel); border-radius: 7px; padding: 7px 10px; width: 100%; min-width: 0; }
input.i:focus, select.i:focus, textarea.i:focus { outline: 2px solid var(--accent-bg); border-color: var(--accent); }
textarea.i { resize: vertical; }
.chk { display: inline-flex; align-items: center; gap: 6px; cursor: pointer; font-size: 13px; }
.tag { display: inline-block; padding: 1px 7px; border-radius: 99px; font-size: 11.5px; font-weight: 600; background: var(--panel-2); border: 1px solid var(--line); color: var(--muted); }
.tag.ok { background: var(--ok-bg); color: var(--ok); border-color: transparent; }
.tag.warn { background: var(--warn-bg); color: var(--warn); border-color: transparent; }
.tag.bad { background: var(--bad-bg); color: var(--bad); border-color: transparent; }
.tag.acc { background: var(--accent-bg); color: var(--accent); border-color: transparent; }
.msg { padding: 9px 12px; border-radius: 7px; font-size: 13px; margin: 6px 0; }
.msg.bad { background: var(--bad-bg); color: var(--bad); }
.msg.warn { background: var(--warn-bg); color: var(--warn); }
.msg.ok { background: var(--ok-bg); color: var(--ok); }
.msg.info { background: var(--accent-bg); color: var(--accent-2); }
.msg ul { margin: 0; padding-left: 18px; }

/* ---------- tablas */
.tw { overflow-x: auto; }
table.t { width: 100%; border-collapse: collapse; font-size: 13px; }
.t th { text-align: left; font-weight: 600; color: var(--muted); font-size: 12px; padding: 8px 10px; border-bottom: 1px solid var(--line); background: var(--panel-2); white-space: nowrap; position: sticky; top: 0; }
.t td { padding: 7px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
.t tr.click { cursor: pointer; }
.t tr.click:hover td { background: var(--panel-2); }
.t td.sku { font-family: var(--mono); font-weight: 600; white-space: nowrap; }
.t td.num { font-family: var(--mono); white-space: nowrap; color: var(--muted); }
.t input.i, .t select.i { padding: 4px 7px; }
.empty { padding: 36px 16px; text-align: center; color: var(--muted); }

/* ---------- generador */
.sku-big { font: 700 34px/1.1 var(--mono); letter-spacing: 1px; padding: 18px 16px; text-align: center; border-radius: var(--r); background: var(--panel-2); border: 1px dashed var(--line-2); word-break: break-all; }
.sku-big.ok { border: 1px solid var(--ok); background: var(--ok-bg); color: var(--ok); }
.sku-big.bad { border: 1px solid var(--bad); background: var(--bad-bg); color: var(--bad); }
.bloques { display: flex; justify-content: center; gap: 6px; margin-top: 10px; flex-wrap: wrap; }
.bloque { text-align: center; font-size: 11px; color: var(--muted); }
.bloque b { display: block; font: 700 15px var(--mono); color: var(--text); background: var(--panel); border: 1px solid var(--line); border-radius: 5px; padding: 3px 8px; margin-bottom: 2px; }
.lista-mini { max-height: 260px; overflow-y: auto; font-size: 12.5px; }
.lista-mini div { padding: 3px 0; border-bottom: 1px dashed var(--line); display: flex; gap: 10px; }
.lista-mini .mono { font-weight: 600; min-width: 120px; }

/* ---------- chat */
.chat { display: flex; flex-direction: column; height: calc(100vh - 150px); min-height: 480px; }
.chat-log { flex: 1; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 14px; }
.burbuja { max-width: 760px; padding: 10px 14px; border-radius: 10px; white-space: pre-wrap; }
.burbuja.user { align-self: flex-end; background: var(--accent); color: #fff; border-bottom-right-radius: 3px; }
.burbuja.bot { align-self: flex-start; background: var(--panel-2); border: 1px solid var(--line); border-bottom-left-radius: 3px; }
.chat-in { border-top: 1px solid var(--line); padding: 12px; display: flex; gap: 8px; align-items: flex-end; }
.chat-in textarea { min-height: 46px; max-height: 180px; }
.propuesta { border: 1px solid var(--line); border-radius: var(--r); background: var(--panel); padding: 12px 14px; max-width: 880px; width: 100%; }
.propuesta.creada { border-color: var(--ok); }
.propuesta .sku-edit { font: 700 20px var(--mono); letter-spacing: .5px; }
.propuesta .motivo { font-size: 12.5px; color: var(--muted); margin: 4px 0 8px; }
.ejemplos { display: flex; gap: 6px; flex-wrap: wrap; padding: 0 16px 12px; }
.ejemplos button { font-size: 12.5px; }
.pensando { color: var(--muted); font-style: italic; }
.pensando::after { content: ""; animation: pts 1.2s steps(4) infinite; }
@keyframes pts { 0% { content: ""; } 25% { content: "."; } 50% { content: ".."; } 75% { content: "..."; } }

/* ---------- panel lateral / modal */
.velo { position: fixed; inset: 0; background: rgba(0,0,0,.35); z-index: 40; }
.drawer { position: fixed; top: 0; right: 0; bottom: 0; width: min(560px, 100vw); background: var(--panel); border-left: 1px solid var(--line); z-index: 41; overflow-y: auto; box-shadow: -8px 0 24px rgba(0,0,0,.15); }
.drawer .card-h { position: sticky; top: 0; background: var(--panel); z-index: 1; }
.toast { position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%); background: #111418; color: #fff; padding: 10px 16px; border-radius: 8px; z-index: 60; box-shadow: var(--shadow); max-width: 90vw; }
.toast.bad { background: var(--bad); }

/* ---------- login */
.login { min-height: 100vh; display: grid; place-items: center; padding: 16px; background: radial-gradient(1200px 600px at 20% -10%, rgba(31,111,235,.15), transparent), var(--bg); }
.login .card { width: min(380px, 100%); }
.login .brand { padding: 0 0 18px; }
.login .brand b { color: var(--text); }

.estado-dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--faint); margin-right: 6px; }
.estado-dot.ok { background: var(--ok); } .estado-dot.bad { background: var(--bad); } .estado-dot.warn { background: var(--warn); }
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--line); margin-bottom: 14px; }
.tabs button { background: none; border: 0; padding: 8px 12px; cursor: pointer; color: var(--muted); border-bottom: 2px solid transparent; font-weight: 550; }
.tabs button.on { color: var(--text); border-bottom-color: var(--accent); }
.gravedad-alta { box-shadow: inset 3px 0 0 var(--bad); }
.gravedad-media { box-shadow: inset 3px 0 0 var(--warn); }
.gravedad-baja { box-shadow: inset 3px 0 0 var(--accent); }
.gravedad-info { box-shadow: inset 3px 0 0 var(--line-2); }

/* ---------- movil */
@media (max-width: 900px) {
  .app { grid-template-columns: 1fr; }
  .side { position: fixed; left: 0; top: 0; bottom: 0; width: 240px; z-index: 50; transform: translateX(-100%); transition: transform .2s; }
  .side.abierto { transform: none; }
  .menu-btn { display: inline-flex; }
  .main { padding: 14px 16px 60px; }
  .g2, .g3, .g4 { grid-template-columns: 1fr; }
  .g4.kpis { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .sku-big { font-size: 24px; }
  .chat { height: calc(100vh - 120px); }
}