:root {
  --bg: #f6f4ef; --panel: #ffffff; --ink: #1f1e1c; --muted: #6b6760; --line: #e3dfd6;
  --accent: #2f5d50; --accent-ink: #ffffff; --me: #e7efe9; --error: #a1322a;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #1c1b19; --panel: #262522; --ink: #ece9e3; --muted: #a39e94; --line: #3a3833;
          --accent: #7fb7a4; --accent-ink: #10201b; --me: #2d3a35; --error: #f08a80; }
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body { background: var(--bg); color: var(--ink);
       font: 17px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; }
[hidden] { display: none !important; }
button { font: inherit; border: 0; border-radius: 10px; padding: 0.7em 1em; cursor: pointer;
         background: var(--accent); color: var(--accent-ink); }
button.secondary { background: transparent; color: var(--accent); border: 1px solid var(--line); }
button.icon { background: transparent; color: var(--ink); font-size: 1.3rem; padding: 0.3em 0.6em; }
input, textarea { font: inherit; color: var(--ink); background: var(--panel); border: 1px solid var(--line);
                  border-radius: 10px; padding: 0.65em 0.8em; width: 100%; }
label { display: block; margin: 0 0 0.9em; color: var(--muted); font-size: 0.9rem; }
label input { margin-top: 0.3em; font-size: 1.05rem; }
.error { color: var(--error); min-height: 1.5em; }
.hint { color: var(--muted); font-size: 0.85rem; }

.card { max-width: 380px; margin: 12vh auto 0; padding: 0 16px; }
.card h1 { font-weight: 600; letter-spacing: -0.01em; }
.card form button { width: 100%; margin-top: 0.3em; }
.card > .secondary { width: 100%; margin-top: 0.8em; }

#app { display: flex; flex-direction: column; height: 100dvh; }
header { display: flex; align-items: center; justify-content: space-between; padding: 6px 8px;
         padding-top: max(6px, env(safe-area-inset-top)); border-bottom: 1px solid var(--line); background: var(--bg); }
.brand { font-weight: 600; }
#drawer { position: fixed; z-index: 5; top: 0; left: 0; bottom: 0; width: min(320px, 85vw); overflow-y: auto;
          background: var(--panel); border-right: 1px solid var(--line); padding: 16px;
          padding-top: max(16px, env(safe-area-inset-top)); display: flex; flex-direction: column; gap: 10px; }
#conv-list { list-style: none; margin: 0; padding: 0; flex: 1; }
#conv-list button { width: 100%; text-align: left; background: transparent; color: var(--ink);
                    padding: 0.6em 0.5em; border-radius: 8px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
#conv-list button.current { background: var(--me); }
.drawer-foot { border-top: 1px solid var(--line); padding-top: 10px; display: flex; flex-direction: column; gap: 8px; }
.drawer-foot p { margin: 0; color: var(--muted); font-size: 0.85rem; }

#chat { flex: 1; overflow-y: auto; -webkit-overflow-scrolling: touch; }
#messages { max-width: 760px; margin: 0 auto; padding: 16px; display: flex; flex-direction: column; gap: 12px; }
.msg { max-width: 92%; padding: 0.6em 0.9em; border-radius: 14px; overflow-wrap: anywhere; }
.msg.user { align-self: flex-end; background: var(--me); white-space: pre-wrap; }
.msg.assistant { align-self: flex-start; background: var(--panel); border: 1px solid var(--line); }
.msg.assistant p { margin: 0 0 0.6em; } .msg.assistant p:last-child { margin-bottom: 0; }
.msg.assistant ul, .msg.assistant ol { margin: 0.2em 0 0.6em; padding-left: 1.3em; }
.msg.assistant code { font-size: 0.9em; background: var(--bg); padding: 0.1em 0.3em; border-radius: 4px; }
.msg.assistant pre { background: var(--bg); padding: 0.6em; border-radius: 8px; overflow-x: auto; }
.msg.assistant table { border-collapse: collapse; font-size: 0.9em; margin: 0.2em 0 0.6em; display: block; overflow-x: auto; }
.msg.assistant td, .msg.assistant th { border: 1px solid var(--line); padding: 0.25em 0.5em; }
.status { align-self: flex-start; color: var(--muted); font-size: 0.85rem; }
.notice { align-self: center; text-align: center; color: var(--muted); font-size: 0.9rem; border: 1px dashed var(--line);
          border-radius: 10px; padding: 0.5em 0.8em; max-width: 92%; }
.empty { color: var(--muted); text-align: center; margin-top: 20vh; }

#composer { display: flex; gap: 8px; align-items: flex-end; padding: 8px; border-top: 1px solid var(--line);
            padding-bottom: max(8px, env(safe-area-inset-bottom)); max-width: 760px; width: 100%; margin: 0 auto; }
#input { resize: none; max-height: 40vh; line-height: 1.4; }
#send { padding: 0.65em 0.9em; }
#send:disabled { opacity: 0.5; }