:root {
  --bg: #f7f6f3; --panel: #ffffff; --side: #efede8; --text: #1f1e1c; --muted: #6f6b64;
  --border: #e2dfd8; --accent: #c4623d; --accent-text: #fff; --user-bubble: #ece8e0;
  --code-bg: #f1efea; --error: #b3261e; --ok: #2e7d32; --radius: 12px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1d1c1a; --panel: #262523; --side: #191816; --text: #ecebe8; --muted: #a29e96;
    --border: #3a3835; --accent: #d97757; --user-bubble: #34322e; --code-bg: #2f2d2a;
    --error: #ff8a80; --ok: #81c784; color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font: 15px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
[hidden] { display: none !important; }
h1 { font-size: 1.6rem; margin: 0 0 .25rem; } h2 { font-size: 1.15rem; margin: 0; } h3 { font-size: 1rem; margin: 1.2rem 0 .5rem; }
.muted { color: var(--muted); } .small { font-size: .85rem; } .error { color: var(--error); min-height: 1em; margin: .4rem 0; }
code, .mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: .88em; }
.row { display: flex; gap: .5rem; align-items: center; flex-wrap: wrap; } .spread { justify-content: space-between; }

button, .button { font: inherit; cursor: pointer; border-radius: 8px; border: 1px solid var(--border); background: var(--panel); color: var(--text); padding: .5rem .9rem; display: inline-flex; align-items: center; gap: .3rem; }
button:disabled { opacity: .5; cursor: default; }
.primary { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }
.ghost { background: transparent; } .ghost:hover { background: var(--user-bubble); }
.icon { background: transparent; border: 0; font-size: 1.2rem; padding: .3rem .5rem; }
.block { width: 100%; justify-content: flex-start; }
button.small, label.small { padding: .3rem .6rem; font-size: .85rem; }
input, select, textarea { font: inherit; color: var(--text); background: var(--bg); border: 1px solid var(--border); border-radius: 8px; padding: .55rem .7rem; width: 100%; }
input:focus, select:focus, textarea:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
label { display: block; font-size: .9rem; color: var(--muted); margin-bottom: .7rem; }
label > input, label > select, label > textarea { margin-top: .25rem; }
label.check { display: flex; gap: .5rem; align-items: center; color: var(--text); padding-top: 1.6rem; }
label.check input { width: auto; margin: 0; }

.center { min-height: 100%; display: grid; place-items: center; padding: 1rem; }
.card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.4rem; margin-bottom: 1rem; }
.narrow { width: 100%; max-width: 380px; }
.narrow .primary[type=submit] { width: 100%; justify-content: center; margin-top: .5rem; }
.notice { background: var(--user-bubble); border-radius: var(--radius); padding: 1rem; margin-bottom: 1rem; }

/* Layout */
#view-app { display: flex; height: 100dvh; }
#sidebar { width: 270px; flex-shrink: 0; background: var(--side); border-right: 1px solid var(--border); display: flex; flex-direction: column; padding: .8rem; gap: .6rem; padding-top: calc(.8rem + env(safe-area-inset-top, 0px)); }
.side-top { display: flex; justify-content: space-between; align-items: center; }
.brand { font-size: 1.05rem; } #close-sidebar, #open-sidebar { display: none; }
#conv-list { flex: 1; overflow-y: auto; display: flex; flex-direction: column; gap: 2px; }
.conv { display: flex; align-items: center; border-radius: 8px; }
.conv a { flex: 1; padding: .45rem .6rem; color: var(--text); text-decoration: none; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; font-size: .92rem; }
.conv:hover, .conv.active { background: var(--user-bubble); }
.conv .del { visibility: hidden; border: 0; background: transparent; color: var(--muted); padding: .2rem .5rem; }
.conv:hover .del { visibility: visible; }
.side-bottom { border-top: 1px solid var(--border); padding-top: .6rem; display: flex; flex-direction: column; gap: .4rem; }
.me { display: flex; flex-direction: column; padding: .2rem .3rem; }

#main { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.topbar { display: flex; align-items: center; gap: .5rem; padding: .7rem 1rem; border-bottom: 1px solid var(--border); min-height: 52px; padding-top: calc(.7rem + env(safe-area-inset-top, 0px)); }
.topbar h2 { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; font-weight: 600; }
.panel { flex: 1; display: flex; flex-direction: column; min-height: 0; }
.scroll { overflow-y: auto; }
.content { max-width: 1100px; width: 100%; margin: 0 auto; padding: 1.2rem 1rem 3rem; }

/* Mensajes */
#messages { flex: 1; overflow-y: auto; padding: 1.2rem 1rem; }
.msg { max-width: 780px; margin: 0 auto 1.1rem; }
.msg.user .bubble { background: var(--user-bubble); border-radius: 16px; padding: .6rem 1rem; margin-left: auto; width: fit-content; max-width: 85%; white-space: pre-wrap; overflow-wrap: anywhere; }
.msg.assistant .md { overflow-wrap: anywhere; }
.md p { margin: .45rem 0; } .md ul, .md ol { padding-left: 1.4rem; }
.md pre { background: var(--code-bg); padding: .8rem; border-radius: 8px; overflow-x: auto; }
.md :not(pre) > code { background: var(--code-bg); padding: .1rem .3rem; border-radius: 4px; }
.md table { border-collapse: collapse; display: block; overflow-x: auto; } .md th, .md td { border: 1px solid var(--border); padding: .3rem .6rem; }
.md a { color: var(--accent); }
.tool { border: 1px solid var(--border); border-radius: 8px; margin: .5rem 0; font-size: .87rem; background: var(--panel); }
.tool summary { cursor: pointer; padding: .4rem .7rem; color: var(--muted); list-style: none; }
.tool summary::before { content: "▸ "; } .tool[open] summary::before { content: "▾ "; }
.tool pre { margin: 0; padding: .6rem .7rem; border-top: 1px solid var(--border); max-height: 300px; overflow: auto; white-space: pre-wrap; font-size: .8rem; }
.tool.err summary { color: var(--error); }
.msg-error { color: var(--error); font-size: .9rem; margin: .4rem 0; }
.cost { font-size: .75rem; color: var(--muted); }
.typing::after { content: "▍"; animation: blink 1s steps(1) infinite; color: var(--accent); }
@keyframes blink { 50% { opacity: 0; } }
.empty { text-align: center; margin-top: 18vh; }

#composer { padding: .6rem 1rem calc(.8rem + env(safe-area-inset-bottom, 0px)); }
.composer-box { max-width: 780px; margin: 0 auto; background: var(--panel); border: 1px solid var(--border); border-radius: 16px; padding: .5rem; display: flex; flex-direction: column; gap: .3rem; }
.composer-box textarea { border: 0; background: transparent; resize: none; max-height: 40vh; padding: .4rem .5rem; outline: none; }
.composer-actions { display: flex; justify-content: flex-end; gap: .4rem; align-items: center; }
.attach { margin: 0 auto 0 0; cursor: pointer; color: var(--text); border-radius: 8px; }
#composer-note { max-width: 780px; margin: .3rem auto 0; text-align: center; min-height: 1em; }

/* Admin */
.tabs { display: flex; gap: .3rem; border-bottom: 1px solid var(--border); margin-bottom: 1rem; flex-wrap: wrap; }
.tab { border: 0; border-bottom: 2px solid transparent; border-radius: 0; background: transparent; }
.tab.active { border-bottom-color: var(--accent); font-weight: 600; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 0 1rem; }
.table-wrap { overflow-x: auto; }
.table { width: 100%; border-collapse: collapse; font-size: .9rem; }
.table th, .table td { text-align: left; padding: .5rem .55rem; border-bottom: 1px solid var(--border); vertical-align: middle; white-space: nowrap; }
.table th { color: var(--muted); font-weight: 500; }
.table select, .table input { padding: .25rem .4rem; width: auto; margin: 0; }
.table input[type=number] { width: 90px; }
.badge { font-size: .75rem; padding: .1rem .5rem; border-radius: 99px; background: var(--user-bubble); }
.badge.off { color: var(--error); } .badge.on { color: var(--ok); }

@media (max-width: 760px) {
  #sidebar { position: fixed; inset: 0 auto 0 0; z-index: 10; transform: translateX(-100%); transition: transform .2s; box-shadow: 0 0 30px rgba(0,0,0,.3); }
  #sidebar.open { transform: none; }
  #close-sidebar, #open-sidebar { display: inline-flex; }
  .msg.user .bubble { max-width: 92%; }
}