:root {
  --bg: #f6f5f2; --panel: #ffffff; --side: #efede8; --text: #1f1e1c; --muted: #6b6862;
  --border: #e2dfd8; --accent: #c4532d; --accent-text: #ffffff; --user: #e9e5dc; --danger: #b3261e;
  --code: #f1efea;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1d1c1a; --panel: #262523; --side: #22211f; --text: #ecebe8; --muted: #a29f98;
    --border: #3a3835; --accent: #e07a52; --accent-text: #1d1c1a; --user: #34322e; --danger: #f2756a;
    --code: #2f2e2b;
  }
}
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body { background: var(--bg); color: var(--text); font: 15px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
[hidden] { display: none !important; }
button { font: inherit; cursor: pointer; border-radius: 8px; border: 1px solid transparent; padding: 8px 14px; color: var(--text); background: none; }
button:disabled { opacity: .5; cursor: default; }
.primary { background: var(--accent); color: var(--accent-text); font-weight: 600; }
.ghost { border-color: var(--border); }
.ghost:hover { background: var(--panel); }
.danger { color: var(--danger); }
.danger-btn { background: var(--danger); color: #fff; font-weight: 600; }
.icon { padding: 6px 10px; }
.wide { width: 100%; }
.error { color: var(--danger); margin: 0; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; }
.logo { display: inline-grid; place-items: center; width: 30px; height: 30px; border-radius: 8px; background: var(--accent); color: var(--accent-text); font-weight: 800; }

/* Connexion */
.login { min-height: 100%; display: grid; place-items: center; padding: 16px; }
.login-card { width: 100%; max-width: 360px; background: var(--panel); border: 1px solid var(--border); border-radius: 14px; padding: 28px; display: grid; gap: 16px; }
.login-card label { display: grid; gap: 6px; font-weight: 600; font-size: 14px; }
input, textarea { font: inherit; color: var(--text); background: var(--bg); border: 1px solid var(--border); border-radius: 8px; padding: 10px 12px; width: 100%; }
input:focus, textarea:focus { outline: 2px solid var(--accent); outline-offset: -1px; }

/* Application */
.app { display: grid; grid-template-columns: 270px 1fr; height: 100%; }
.sidebar { background: var(--side); border-right: 1px solid var(--border); display: flex; flex-direction: column; gap: 14px; padding: 16px; min-height: 0; }
.conv-list { flex: 1; overflow-y: auto; display: grid; align-content: start; gap: 2px; }
.conv-item { text-align: left; padding: 8px 10px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; color: var(--text); }
.conv-item:hover { background: var(--panel); }
.conv-item.active { background: var(--panel); border-color: var(--border); font-weight: 600; }
.conv-item .dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--accent); margin-right: 6px; animation: pulse 1.2s infinite; }
.sidebar-foot { display: flex; align-items: center; justify-content: space-between; gap: 8px; color: var(--muted); font-size: 13px; }

.main { display: flex; flex-direction: column; min-width: 0; min-height: 0; height: 100%; }
.topbar { display: flex; align-items: center; gap: 8px; padding: 10px 16px; border-bottom: 1px solid var(--border); }
.topbar h1 { flex: 1; font-size: 16px; margin: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
#toggle-sidebar { display: none; }

.messages { flex: 1; overflow-y: auto; padding: 24px 16px; }
.messages > * { max-width: 820px; margin-left: auto; margin-right: auto; }
.empty { text-align: center; color: var(--muted); margin-top: 12vh; }
.empty h2 { color: var(--text); }
.msg { margin-bottom: 22px; }
.msg.user .bubble { background: var(--user); border-radius: 14px; padding: 10px 14px; margin-left: auto; width: fit-content; max-width: 85%; white-space: pre-wrap; overflow-wrap: anywhere; }
.msg.user { display: flex; flex-direction: column; align-items: flex-end; gap: 6px; }
.msg.assistant .content { overflow-wrap: anywhere; }
.content p { margin: 0 0 10px; }
.content pre { background: var(--code); padding: 10px; border-radius: 8px; overflow-x: auto; }
.content code { background: var(--code); padding: 1px 4px; border-radius: 4px; font-size: 13px; }
.content pre code { background: none; padding: 0; }
.content a { color: var(--accent); }
.content table { border-collapse: collapse; display: block; overflow-x: auto; }
.content th, .content td { border: 1px solid var(--border); padding: 4px 8px; }
.content img { max-width: 100%; }
.steps { font-size: 13px; color: var(--muted); margin-bottom: 8px; }
.steps summary { cursor: pointer; }
.steps ul { margin: 6px 0; padding-left: 18px; }
.live-step { font-size: 13px; color: var(--muted); display: flex; gap: 8px; align-items: center; margin: 6px 0; }
.spinner { width: 12px; height: 12px; border: 2px solid var(--border); border-top-color: var(--accent); border-radius: 50%; animation: spin .8s linear infinite; flex: none; }
.note { color: var(--muted); font-size: 14px; border-left: 2px solid var(--border); padding-left: 10px; margin: 6px 0; }
.msg-error { color: var(--danger); font-size: 14px; margin-top: 6px; }

.files { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.file { display: inline-flex; align-items: center; gap: 8px; padding: 8px 12px; border: 1px solid var(--border); border-radius: 10px; background: var(--panel); color: var(--text); text-decoration: none; font-size: 14px; max-width: 100%; }
.file:hover { border-color: var(--accent); }
.file .fname { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.file .fsize { color: var(--muted); font-size: 12px; flex: none; }
.preview { display: block; margin-top: 10px; max-width: 100%; border: 1px solid var(--border); border-radius: 10px; }

.composer { border-top: 1px solid var(--border); padding: 12px 16px 16px; }
.composer > * { max-width: 820px; margin: 0 auto; }
.composer.drag { background: var(--user); }
.attachments { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 8px; }
.attachments:empty { display: none; }
.chip { display: inline-flex; gap: 6px; align-items: center; background: var(--user); border-radius: 999px; padding: 3px 4px 3px 10px; font-size: 13px; max-width: 100%; }
.chip span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.chip button { padding: 0 6px; }
.composer-row { display: flex; gap: 8px; align-items: flex-end; }
.composer-row textarea { resize: none; max-height: 220px; }
.attach { cursor: pointer; display: inline-flex; align-items: center; border: 1px solid var(--border); border-radius: 8px; height: 42px; }

@keyframes spin { to { transform: rotate(360deg); } }
@keyframes pulse { 50% { opacity: .3; } }

@media (max-width: 760px) {
  .app { grid-template-columns: 1fr; }
  .sidebar { position: fixed; inset: 0 auto 0 0; width: 82%; max-width: 300px; z-index: 10; transform: translateX(-100%); transition: transform .2s; }
  .sidebar.open { transform: none; box-shadow: 0 0 40px rgba(0,0,0,.3); }
  #toggle-sidebar { display: inline-block; }
  #rename-conv { display: none; }
  .messages { padding: 16px; }
  .composer { padding: 10px 16px 14px; }
  #send { padding: 8px 10px; }
}