:root{
  color-scheme:light;
  --bg:#f7f0e6;
  --bg-soft:#fbf7f0;
  --panel:#fffdf8;
  --panel-2:#f0e7d8;
  --panel-soft:#f5ecdc;
  --text:#2f2a26;
  --muted:#7a7068;
  --faint:#a89c8b;
  --line:#e8ddcb;
  --line-soft:#efe6d4;
  --accent:#c97b5a;
  --accent-strong:#b56a4c;
  --accent-soft:#f5ddcc;
  --accent-ink:#ffffff;
  --accent-2:#8aa97f;
  --me-bubble:#f3decd;
  --me-bubble-ink:#4a2c1f;
  --them-bubble:#ffffff;
  --them-bubble-ink:#2f2a26;
  --danger:#b85a4d;
  --danger-soft:#f5dcd6;
  --shadow-sm:0 1px 2px rgba(80,60,35,.05);
  --shadow-md:0 6px 18px rgba(80,60,35,.07);
  --shadow-lg:0 18px 38px rgba(80,60,35,.10);
  --radius:8px;
  --radius-lg:8px;
  --radius-pill:999px;
}
body[data-theme="dark"]{
  color-scheme:dark;
  --bg:#1f1b17;
  --bg-soft:#262119;
  --panel:#2b2620;
  --panel-2:#332c25;
  --panel-soft:#2e2922;
  --text:#f0e8db;
  --muted:#a89a87;
  --faint:#7d6f5d;
  --line:#3a322a;
  --line-soft:#322b24;
  --accent:#e09775;
  --accent-strong:#ec9f7a;
  --accent-soft:#4a342a;
  --accent-ink:#1f1b17;
  --accent-2:#9bb38b;
  --me-bubble:#4a342a;
  --me-bubble-ink:#f3decd;
  --them-bubble:#2e2922;
  --them-bubble-ink:#f0e8db;
  --danger:#e0786f;
  --danger-soft:#3f2622;
  --shadow-sm:0 1px 2px rgba(0,0,0,.25);
  --shadow-md:0 6px 18px rgba(0,0,0,.25);
  --shadow-lg:0 18px 38px rgba(0,0,0,.4);
}

*{box-sizing:border-box}
html,body,#app{height:100%}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font:15px/1.5 -apple-system,BlinkMacSystemFont,"SF Pro Text","PingFang SC","Helvetica Neue",Arial,sans-serif;
  letter-spacing:0;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
button,input,textarea,select{font:inherit;color:inherit}

button{
  border:1px solid var(--line);
  background:var(--panel);
  color:var(--text);
  border-radius:var(--radius);
  padding:.5rem .85rem;
  cursor:pointer;
  transition:background .15s,border-color .15s,color .15s,transform .08s;
}
button:hover:not(:disabled){background:var(--panel-soft)}
button:active:not(:disabled){transform:translateY(.5px)}
button.primary{
  background:var(--accent);
  border-color:var(--accent);
  color:var(--accent-ink);
  font-weight:600;
  box-shadow:var(--shadow-sm);
}
button.primary:hover:not(:disabled){background:var(--accent-strong);border-color:var(--accent-strong)}
button.ghost{background:transparent;border-color:transparent;color:var(--muted)}
button.ghost:hover:not(:disabled){background:var(--panel-soft);color:var(--text)}
button.danger{background:var(--danger-soft);border-color:transparent;color:var(--danger)}
button:disabled{opacity:.5;cursor:not-allowed}

input,textarea,select{
  width:100%;
  border:1px solid var(--line);
  background:var(--panel);
  border-radius:var(--radius);
  padding:.6rem .75rem;
  outline:none;
  transition:border-color .15s,box-shadow .15s;
}
input:focus,textarea:focus,select:focus{
  border-color:var(--accent);
  box-shadow:0 0 0 3px var(--accent-soft);
}
textarea{min-height:96px;resize:vertical;line-height:1.5}
label{display:block;color:var(--muted);font-size:.78rem;margin:0 0 .3rem;font-weight:500}

/* Layout shell */
.app-shell{min-height:100%;display:flex}
.layout{display:grid;grid-template-columns:260px minmax(0,1fr);width:100%;min-height:100vh}

/* Sidebar */
.sidebar{
  border-right:1px solid var(--line-soft);
  background:var(--bg-soft);
  padding:1.1rem .85rem;
  display:flex;
  flex-direction:column;
  gap:1rem;
}
.brand{display:flex;align-items:center;gap:.75rem;padding:.1rem .25rem .25rem}
.brand-mark{
  width:38px;height:38px;
  border-radius:8px;
  background:var(--accent);
  color:var(--accent-ink);
  display:grid;place-items:center;
  font-weight:700;
  letter-spacing:0;
  box-shadow:var(--shadow-sm);
}
.brand-title{font-weight:700;font-size:.95rem;letter-spacing:0}
.brand-subtitle{font-size:.74rem;color:var(--muted);margin-top:.1rem}

.nav{display:grid;gap:2px}
.nav button{
  display:flex;
  align-items:center;
  gap:.65rem;
  padding:.55rem .7rem;
  background:transparent;
  border:1px solid transparent;
  border-radius:8px;
  color:var(--muted);
  font-weight:500;
  text-align:left;
}
.nav button:hover{background:var(--panel-soft);color:var(--text)}
.nav button.active{
  background:var(--panel);
  border-color:var(--line-soft);
  color:var(--text);
  box-shadow:var(--shadow-sm);
}
.nav .nav-icon{display:inline-flex;width:18px;height:18px;color:currentColor;flex:0 0 auto}
.nav .nav-icon svg{width:100%;height:100%;display:block}
.nav .nav-label{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.nav .nav-short{display:none}
.nav .count{
  color:var(--faint);
  font-size:.72rem;
  font-variant-numeric:tabular-nums;
  background:transparent;
  padding:0 .15rem;
}
.nav button.active .nav-icon,
.nav button.active .count{color:var(--accent)}

.side-footer{
  margin-top:auto;
  color:var(--muted);
  font-size:.75rem;
  display:grid;
  gap:.2rem;
  padding:.6rem .25rem 0;
  border-top:1px solid var(--line-soft);
}

/* Main */
.main{min-width:0;display:flex;flex-direction:column;max-height:100vh;background:var(--bg)}
.topbar{
  height:64px;
  border-bottom:1px solid var(--line-soft);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:.75rem;
  padding:0 1.5rem;
  background:var(--bg);
}
.topbar h1{font-size:1.05rem;margin:0;font-weight:700;letter-spacing:0}
.topbar p{margin:.1rem 0 0;color:var(--muted);font-size:.78rem}
.status-pill{
  border:1px solid var(--line);
  background:var(--panel);
  border-radius:var(--radius-pill);
  padding:.3rem .65rem;
  color:var(--muted);
  font-size:.74rem;
  white-space:nowrap;
  flex:0 0 auto;
}
.content{flex:1;min-height:0;overflow:auto;padding:1.1rem 1.5rem 1.25rem}

/* Chat */
.chat-view{
  height:100%;
  display:grid;
  grid-template-rows:minmax(0,1fr) auto;
  gap:.85rem;
  max-width:900px;
  margin:0 auto;
  width:100%;
}
.message-list{
  min-height:0;
  min-width:0;
  overflow-y:auto;
  overflow-x:hidden;
  display:flex;
  flex-direction:column;
  gap:.7rem;
  padding:.15rem .1rem .25rem;
}
.message-row{display:flex;gap:.55rem;align-items:flex-start;min-width:0;max-width:100%}
.message-row.me{margin-left:auto;flex-direction:row-reverse}

.avatar{
  width:30px;height:30px;
  border-radius:50%;
  background:var(--panel-soft);
  border:1px solid var(--line-soft);
  display:grid;place-items:center;
  color:var(--muted);
  font-weight:600;
  font-size:.7rem;
  letter-spacing:0;
  flex:0 0 auto;
}
.message-row.me .avatar{background:var(--accent-soft);color:var(--accent-strong);border-color:transparent}

.bubble{
  max-width:min(640px,76%);
  min-width:0;
  background:var(--them-bubble);
  color:var(--them-bubble-ink);
  border:1px solid var(--line-soft);
  border-radius:8px 8px 8px 3px;
  padding:.55rem .8rem .65rem;
  box-shadow:var(--shadow-sm);
  overflow-wrap:anywhere;
}
.message-row.me .bubble{
  background:var(--me-bubble);
  color:var(--me-bubble-ink);
  border-color:transparent;
  border-radius:8px 8px 3px 8px;
}
.meta{
  display:flex;gap:.5rem;align-items:center;
  color:var(--muted);font-size:.7rem;
  margin-bottom:.2rem;
}
.meta strong{font-weight:600;color:inherit}
.message-row.me .meta{color:rgba(74,44,31,.65)}
body[data-theme="dark"] .message-row.me .meta{color:rgba(243,222,205,.6)}
.body-text{white-space:pre-wrap;word-break:break-word;line-height:1.5}

.attachments{display:grid;gap:.45rem;margin-top:.55rem}
.attachment-image{
  display:block;width:auto;height:auto;
  max-width:min(380px,70vw);max-height:50vh;
  object-fit:contain;
  background:var(--panel-2);
  border-radius:8px;
  border:1px solid var(--line-soft);
}
.attachment-file{
  display:inline-flex;gap:.55rem;align-items:center;
  color:var(--text);text-decoration:none;
  border:1px solid var(--line);
  border-radius:8px;
  padding:.5rem .7rem;
  background:var(--panel);
  font-size:.85rem;
  transition:background .15s;
}
.attachment-file:hover{background:var(--panel-soft)}

/* Composer */
.composer{display:grid;gap:.45rem}
.composer-bar{
  display:flex;
  align-items:flex-end;
  gap:.3rem;
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:22px;
  padding:5px;
  box-shadow:var(--shadow-sm);
  transition:border-color .15s,box-shadow .15s;
}
.composer-bar:focus-within{
  border-color:var(--accent);
  box-shadow:0 0 0 4px var(--accent-soft);
}
.composer-bar textarea{
  flex:1;
  min-width:0;
  border:0;
  background:transparent;
  resize:none;
  padding:.55rem .4rem;
  min-height:36px;
  max-height:200px;
  line-height:1.45;
  outline:none;
  box-shadow:none;
  field-sizing:content;
}
.composer-bar textarea:focus{box-shadow:none;border:0}
.composer-btn{
  flex:0 0 auto;
  width:36px;height:36px;
  border-radius:50%;
  display:grid;place-items:center;
  padding:0;
  background:transparent;
  border:1px solid transparent;
  color:var(--muted);
  cursor:pointer;
  transition:background .15s,color .15s,transform .08s;
}
.composer-btn:hover:not(:disabled){background:var(--panel-soft);color:var(--text)}
.composer-btn:active:not(:disabled){transform:translateY(.5px)}
.composer-btn svg{width:18px;height:18px;display:block}
.composer-attach{position:relative;display:inline-grid;place-items:center}
.composer-attach input[type=file]{
  position:absolute;inset:0;
  width:100%;height:100%;
  opacity:0;cursor:pointer;
  z-index:1;
}
.composer-send{
  background:var(--accent);
  color:var(--accent-ink);
  border-color:var(--accent);
  box-shadow:var(--shadow-sm);
}
.composer-send:hover:not(:disabled){
  background:var(--accent-strong);
  border-color:var(--accent-strong);
  color:var(--accent-ink);
}
.composer-send:disabled{background:var(--panel-2);color:var(--faint);border-color:transparent;box-shadow:none}
.composer-meta{
  display:flex;
  align-items:center;
  gap:.45rem;
  flex-wrap:wrap;
  padding:0 .35rem;
  color:var(--muted);
  font-size:.74rem;
}
.pending-files{display:flex;gap:.3rem;flex-wrap:wrap}
.chip{
  display:inline-flex;align-items:center;gap:.3rem;
  background:var(--panel);
  border:1px solid var(--line-soft);
  border-radius:var(--radius-pill);
  padding:.22rem .55rem;
  color:var(--muted);
  font-size:.72rem;
  white-space:nowrap;
}

/* Split layouts */
.split{
  display:grid;
  grid-template-columns:minmax(260px,340px) minmax(0,1fr);
  gap:1rem;
  align-items:start;
  max-width:1100px;
}
.panel{
  background:var(--panel);
  border:1px solid var(--line-soft);
  border-radius:8px;
  padding:1.1rem;
  box-shadow:var(--shadow-sm);
}
.panel h2{font-size:.95rem;margin:0 0 .9rem;font-weight:700;letter-spacing:0}
.stack{display:grid;gap:.8rem}

.memory-list{display:grid;gap:.55rem}
.memory-item{
  border:1px solid var(--line-soft);
  border-radius:8px;
  background:var(--panel);
  padding:.85rem .95rem;
  box-shadow:var(--shadow-sm);
}
.memory-head{display:flex;align-items:flex-start;justify-content:space-between;gap:.75rem}
.memory-title{font-weight:700;letter-spacing:0}
.memory-content{white-space:pre-wrap;margin-top:.45rem;color:var(--text);line-height:1.5}

.event-list{display:grid;gap:.5rem;max-width:900px}
.event{
  background:var(--panel);
  border:1px solid var(--line-soft);
  border-left:3px solid var(--accent);
  border-radius:3px 8px 8px 3px;
  padding:.7rem .9rem;
  box-shadow:var(--shadow-sm);
}
.event.error{border-left-color:var(--danger)}
.event.thinking{border-left-color:var(--accent-2)}
.event-title{display:flex;align-items:center;justify-content:space-between;gap:.75rem;font-weight:600}
.event-body{color:var(--muted);white-space:pre-wrap;margin-top:.3rem;font-size:.86rem;line-height:1.5}

.settings-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.85rem}
.form-row{display:grid;gap:.35rem}

.empty{
  border:1px dashed var(--line);
  border-radius:8px;
  color:var(--muted);
  padding:2rem 1rem;
  text-align:center;
  background:var(--bg-soft);
  font-size:.85rem;
}

/* Loading / auth */
.loading-screen{margin:auto;display:grid;place-items:center;gap:.25rem;text-align:center}
.loading-title{font-size:1.4rem;font-weight:700;letter-spacing:0}
.loading-subtitle{color:var(--muted);font-size:.85rem}
.auth-card{
  max-width:420px;
  margin:10vh auto;
  background:var(--panel);
  border:1px solid var(--line-soft);
  border-radius:8px;
  padding:1.5rem;
  box-shadow:var(--shadow-lg);
}
.auth-card h1{margin:0 0 .25rem;font-size:1.3rem;letter-spacing:0}

/* Subtle scrollbars (chat list) */
.message-list::-webkit-scrollbar,
.content::-webkit-scrollbar{width:10px;height:10px}
.message-list::-webkit-scrollbar-thumb,
.content::-webkit-scrollbar-thumb{background:var(--line);border-radius:999px;border:2px solid var(--bg)}
.message-list::-webkit-scrollbar-thumb:hover,
.content::-webkit-scrollbar-thumb:hover{background:var(--faint)}
.message-list::-webkit-scrollbar-track,
.content::-webkit-scrollbar-track{background:transparent}

/* Phone and narrow tablet layout */
@media (max-width:1100px){
  .layout{grid-template-columns:1fr}
  .sidebar{
    position:fixed;left:0;right:0;bottom:0;top:auto;
    z-index:10;
    flex-direction:row;
    align-items:stretch;
    border-right:0;
    border-top:1px solid var(--line);
    padding:.3rem .25rem calc(.3rem + env(safe-area-inset-bottom));
    background:var(--bg-soft);
    gap:0;
    box-shadow:0 -6px 18px rgba(80,60,35,.05);
  }
  .brand,.side-footer{display:none}
  .nav{
    width:100%;
    grid-template-columns:repeat(5,1fr);
    gap:2px;
  }
  .nav button{
    flex-direction:column;
    align-items:center;
    justify-content:center;
    gap:.15rem;
    padding:.45rem .15rem .35rem;
    font-size:.68rem;
    min-width:0;
    line-height:1;
    text-align:center;
    border-radius:8px;
    color:var(--muted);
  }
  .nav .nav-icon{width:22px;height:22px}
  .nav .nav-label{display:none}
  .nav .nav-short{display:inline;font-weight:500;line-height:1;white-space:nowrap;letter-spacing:0}
  .nav .count{display:none}
  .nav button.active{
    background:transparent;
    color:var(--accent);
    border-color:transparent;
    box-shadow:none;
  }
  .nav button.active .nav-icon{color:var(--accent)}

  .main{max-height:100dvh;padding-bottom:calc(64px + env(safe-area-inset-bottom))}
  .topbar{height:54px;padding:0 1rem}
  .topbar h1{font-size:1rem}
  .topbar p{font-size:.72rem}
  .status-pill{font-size:.7rem;padding:.25rem .55rem}
  .content{padding:.85rem .9rem 1rem}

  .split{grid-template-columns:1fr}
  .settings-grid{grid-template-columns:1fr}
  .bubble{max-width:82%}
  .composer-bar{border-radius:20px}
  .chat-view{gap:.6rem}
}

@media (max-width:480px){
  .topbar p{display:none}
  .status-pill{max-width:42vw;overflow:hidden;text-overflow:ellipsis}
  .content{padding:.75rem .75rem .9rem}
  .avatar{display:none}
  .bubble{max-width:88%;font-size:.92rem}
  .attachment-image{max-width:72vw}
}