/* Layout: chat — barre latérale des conversations, fil centré (~760px), compositeur fixé en bas */
:root {
  --bg: #f6f5f1; --surface: #ffffff; --side: #eeece6; --sunk: #e9e6de; --line: #dcd8cd;
  --fg: #1d1b16; --muted: #6b665a; --accent: #c98a00; --accent-ink: #1d1500; --accent-soft: #f6e7bf;
  --user: #ebe7dc; --think: #7a6f55; --bad: #b8322a; --ok: #2f7d4a;
  --f-ui: "Segoe UI Variable Text", "Segoe UI", system-ui, -apple-system, Roboto, sans-serif;
  --f-read: "Iowan Old Style", "Charter", "Georgia", "Cambria", serif;
  --f-mono: "Cascadia Code", "JetBrains Mono", ui-monospace, Consolas, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) { :root {
  --bg: #17150f; --surface: #1f1c15; --side: #121009; --sunk: #2a261d; --line: #332e23;
  --fg: #ece6d6; --muted: #a39b87; --accent: #f2b72b; --accent-ink: #1d1500; --accent-soft: #3a2f12;
  --user: #2c281e; --think: #b3a684; --bad: #ff7a6e; --ok: #63c98a;
  color-scheme: dark;
} }

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body { background: var(--bg); color: var(--fg); font: 15px/1.55 var(--f-ui); -webkit-font-smoothing: antialiased; }
button { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
[hidden] { display: none !important; }

/* ---------- login ---------- */
.auth { min-height: 100%; display: grid; place-items: center; padding: 24px 16px; }
.auth-card { width: 100%; max-width: 380px; background: var(--surface); border: 1px solid var(--line); border-radius: 18px; padding: 28px; display: flex; flex-direction: column; gap: 16px; }
.logo { display: flex; align-items: center; gap: 10px; font: 700 1.25rem var(--f-read); letter-spacing: -.01em; }
.logo-mark { width: 32px; height: 32px; border-radius: 9px; background: var(--accent); color: var(--accent-ink); display: grid; place-items: center; }
.logo-mark svg { width: 18px; height: 18px; }
.field { display: flex; flex-direction: column; gap: 6px; font-size: .88rem; font-weight: 600; }
.field input { font: 1rem var(--f-ui); color: var(--fg); background: var(--sunk); border: 1px solid var(--line); border-radius: 10px; padding: 11px 12px; width: 100%; }
.field input:focus { border-color: var(--accent); outline: none; }
.field input.code { font-family: var(--f-mono); letter-spacing: .35em; text-align: center; font-size: 1.15rem; }
.hint { font-weight: 400; color: var(--muted); font-size: .8rem; }
.error { color: var(--bad); font-size: .88rem; min-height: 1.3em; margin: 0; }
.btn { border: 1px solid var(--line); background: var(--surface); border-radius: 10px; padding: 10px 16px; cursor: pointer; font-weight: 600; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn:disabled { opacity: .55; cursor: progress; }

/* ---------- shell ---------- */
.shell { display: grid; grid-template-columns: 270px minmax(0, 1fr); height: 100%; }
.side { background: var(--side); border-right: 1px solid var(--line); display: flex; flex-direction: column; min-height: 0; }
.side-top { padding: 14px 12px 8px; display: flex; flex-direction: column; gap: 12px; }
.new-chat { display: flex; align-items: center; gap: 8px; border: 1px solid var(--line); background: var(--surface); border-radius: 10px; padding: 9px 12px; cursor: pointer; font-weight: 600; text-align: left; }
.new-chat:hover { border-color: var(--accent); }
.conv-list { flex: 1; overflow-y: auto; padding: 4px 8px 12px; display: flex; flex-direction: column; gap: 1px; }
.conv-group { font-size: .7rem; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); font-weight: 600; padding: 12px 8px 4px; }
.conv { display: flex; align-items: center; gap: 4px; border-radius: 8px; }
.conv a { flex: 1; min-width: 0; padding: 7px 8px; color: var(--fg); text-decoration: none; font-size: .9rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; border-radius: 8px; }
.conv:hover, .conv.active { background: var(--sunk); }
.conv .del { opacity: 0; border: 0; background: transparent; cursor: pointer; color: var(--muted); padding: 4px 6px; border-radius: 6px; }
.conv:hover .del, .conv .del:focus-visible { opacity: 1; }
.conv .del:hover { color: var(--bad); }
.side-foot { border-top: 1px solid var(--line); padding: 10px 12px; display: flex; justify-content: space-between; align-items: center; gap: 8px; font-size: .82rem; color: var(--muted); }
.link-btn { border: 0; background: transparent; cursor: pointer; color: var(--muted); padding: 4px; }
.link-btn:hover { color: var(--fg); }
.engine { display: inline-flex; align-items: center; gap: 6px; }
.engine .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--muted); }
.engine.ok .dot { background: var(--ok); }
.engine.bad .dot { background: var(--bad); }

.main { display: flex; flex-direction: column; min-width: 0; min-height: 0; }
.topbar { display: none; align-items: center; gap: 10px; padding: 10px 14px; border-bottom: 1px solid var(--line); }
.thread { flex: 1; overflow-y: auto; padding: 28px 16px 12px; }
.thread-in { max-width: 760px; margin: 0 auto; display: flex; flex-direction: column; gap: 22px; }

/* empty state */
.welcome { max-width: 760px; margin: 12vh auto 0; text-align: center; display: flex; flex-direction: column; align-items: center; gap: 10px; }
.welcome h1 { font: 600 2rem/1.15 var(--f-read); letter-spacing: -.02em; margin: 0; text-wrap: balance; }
.welcome p { color: var(--muted); margin: 0; max-width: 46ch; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-top: 14px; }
.chip { border: 1px solid var(--line); background: var(--surface); border-radius: 999px; padding: 7px 14px; cursor: pointer; font-size: .88rem; }
.chip:hover { border-color: var(--accent); }

/* messages */
.msg-user { align-self: flex-end; max-width: 85%; background: var(--user); border-radius: 16px 16px 4px 16px; padding: 10px 14px; white-space: pre-wrap; overflow-wrap: anywhere; }
.msg-ai { display: flex; flex-direction: column; gap: 8px; min-width: 0; }
.md { font: 1.02rem/1.65 var(--f-read); overflow-wrap: anywhere; }
.md > :first-child { margin-top: 0; }
.md > :last-child { margin-bottom: 0; }
.md p, .md ul, .md ol, .md pre, .md table, .md blockquote { margin: 0 0 .8em; }
.md h1, .md h2, .md h3 { font-family: var(--f-ui); line-height: 1.3; margin: 1.1em 0 .4em; }
.md h1 { font-size: 1.25rem; } .md h2 { font-size: 1.12rem; } .md h3 { font-size: 1rem; }
.md ul, .md ol { padding-left: 1.4em; }
.md li { margin: .2em 0; }
.md a { color: var(--accent); }
.md blockquote { border-left: 3px solid var(--line); padding-left: 12px; color: var(--muted); }
.md code { font: .86em var(--f-mono); background: var(--sunk); padding: .1em .35em; border-radius: 5px; }
.md pre { position: relative; background: var(--sunk); border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; overflow-x: auto; }
.md pre code { background: none; padding: 0; font-size: .84rem; line-height: 1.55; }
.md pre .copy-code { position: absolute; top: 6px; right: 6px; font: 600 .72rem var(--f-ui); border: 1px solid var(--line); background: var(--surface); border-radius: 6px; padding: 3px 8px; cursor: pointer; opacity: 0; }
.md pre:hover .copy-code, .md pre .copy-code:focus-visible { opacity: 1; }
.md table { border-collapse: collapse; display: block; overflow-x: auto; font-family: var(--f-ui); font-size: .9rem; }
.md th, .md td { border: 1px solid var(--line); padding: 6px 10px; text-align: left; }
.md th { background: var(--sunk); }
.md hr { border: 0; border-top: 1px solid var(--line); margin: 1.2em 0; }

.cursor::after { content: ""; display: inline-block; width: .5em; height: 1em; background: var(--accent); margin-left: 2px; vertical-align: -.15em; animation: blink 1s steps(2) infinite; }
@keyframes blink { 50% { opacity: 0; } }

.think { border: 1px solid var(--line); border-radius: 10px; background: color-mix(in srgb, var(--sunk) 55%, transparent); }
.think summary { cursor: pointer; list-style: none; display: flex; align-items: center; gap: 8px; padding: 8px 12px; font-size: .86rem; color: var(--think); font-weight: 600; }
.think summary::-webkit-details-marker { display: none; }
.think summary .chev { transition: transform .2s; }
.think[open] summary .chev { transform: rotate(90deg); }
.think .think-body { padding: 0 14px 12px; font-size: .86rem; line-height: 1.55; color: var(--think); white-space: pre-wrap; max-height: 320px; overflow-y: auto; }
.spark { width: 14px; height: 14px; color: var(--accent); }
.think.live .spark { animation: pulse 1.2s ease-in-out infinite; }
@keyframes pulse { 50% { opacity: .35; } }

.waiting { color: var(--muted); font-size: .9rem; display: flex; align-items: center; gap: 8px; }
.meta { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; font-size: .78rem; color: var(--muted); }
.meta .tag { background: var(--sunk); border-radius: 6px; padding: 1px 7px; font-weight: 600; }
.meta button { border: 0; background: transparent; cursor: pointer; color: var(--muted); padding: 2px 4px; border-radius: 5px; font-size: .78rem; }
.meta button:hover { color: var(--fg); background: var(--sunk); }
.msg-error { color: var(--bad); font-size: .9rem; }

/* composer */
.composer-wrap { padding: 8px 16px calc(14px + env(safe-area-inset-bottom, 0px)); }
.composer { max-width: 760px; margin: 0 auto; background: var(--surface); border: 1px solid var(--line); border-radius: 18px; padding: 10px 10px 8px 14px; box-shadow: 0 6px 24px -14px rgb(0 0 0 / .35); }
.composer:focus-within { border-color: color-mix(in srgb, var(--accent) 60%, var(--line)); }
.composer textarea { width: 100%; border: 0; outline: 0; resize: none; background: transparent; color: var(--fg); font: 1rem/1.5 var(--f-ui); max-height: 240px; min-height: 26px; padding: 4px 0; }
.composer-bar { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-top: 4px; }
.effort { position: relative; }
.effort-btn { display: inline-flex; align-items: center; gap: 6px; border: 1px solid var(--line); background: transparent; border-radius: 999px; padding: 5px 11px; cursor: pointer; font-size: .84rem; font-weight: 600; }
.effort-btn:hover { background: var(--sunk); }
.effort-menu { position: absolute; bottom: calc(100% + 8px); left: 0; width: 300px; max-width: calc(100vw - 40px); background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 6px; box-shadow: 0 16px 40px -18px rgb(0 0 0 / .45); z-index: 20; }
.effort-opt { display: grid; grid-template-columns: 22px 1fr auto; align-items: start; gap: 2px 8px; width: 100%; text-align: left; border: 0; background: transparent; border-radius: 10px; padding: 9px 10px; cursor: pointer; }
.effort-opt:hover, .effort-opt[aria-checked="true"] { background: var(--sunk); }
.effort-opt .bars { grid-row: span 2; display: flex; align-items: flex-end; gap: 2px; height: 16px; padding-top: 2px; }
.effort-opt .bars i, .effort-btn .bars i { width: 3px; border-radius: 2px; background: var(--line); }
.effort-opt .bars i.on, .effort-btn .bars i.on { background: var(--accent); }
.effort-btn .bars { display: flex; align-items: flex-end; gap: 2px; height: 12px; }
.effort-opt b { font-size: .9rem; }
.effort-opt small { grid-column: 2 / span 2; color: var(--muted); font-size: .78rem; line-height: 1.35; }
.effort-opt .speed { font-size: .72rem; color: var(--muted); font-family: var(--f-mono); }
.send { width: 36px; height: 36px; border-radius: 10px; border: 0; background: var(--accent); color: var(--accent-ink); display: grid; place-items: center; cursor: pointer; flex: none; }
.send:disabled { opacity: .4; cursor: default; }
.send svg { width: 18px; height: 18px; }
.foot-note { max-width: 760px; margin: 6px auto 0; text-align: center; font-size: .74rem; color: var(--muted); }

@media (max-width: 820px) {
  .shell { grid-template-columns: minmax(0, 1fr); }
  .side { position: fixed; inset: 0 auto 0 0; width: min(300px, 85vw); z-index: 30; transform: translateX(-102%); transition: transform .2s; padding-top: env(safe-area-inset-top, 0px); }
  .shell.side-open .side { transform: none; box-shadow: 0 0 0 100vmax rgb(0 0 0 / .35); }
  .topbar { display: flex; padding-top: calc(10px + env(safe-area-inset-top, 0px)); }
  .welcome { margin-top: 8vh; }
  .welcome h1 { font-size: 1.6rem; }
}
@media (prefers-reduced-motion: reduce) { .cursor::after, .think.live .spark { animation: none; } .side { transition: none; } }
.bars i:nth-child(1) { height: 5px; } .bars i:nth-child(2) { height: 8px; } .bars i:nth-child(3) { height: 11px; } .bars i:nth-child(4) { height: 14px; }
.effort-btn .bars i:nth-child(4) { height: 12px; }

/* web search */
.composer-bar .spacer { flex: 1; }
.composer-bar { justify-content: flex-start; }
.web-btn { display: inline-flex; align-items: center; gap: 6px; border: 1px solid var(--line); background: transparent; border-radius: 999px; padding: 5px 11px; cursor: pointer; font-size: .84rem; font-weight: 600; color: var(--muted); }
.web-btn svg { width: 15px; height: 15px; }
.web-btn:hover { background: var(--sunk); }
.web-btn[aria-pressed="true"] { color: var(--accent-ink); background: var(--accent); border-color: var(--accent); }
.sources { display: flex; flex-wrap: wrap; gap: 6px; }
.source { display: inline-flex; align-items: center; gap: 6px; max-width: 100%; border: 1px solid var(--line); background: var(--surface); border-radius: 8px; padding: 4px 9px; font-size: .8rem; color: var(--fg); text-decoration: none; }
.source:hover { border-color: var(--accent); }
.source b { background: var(--sunk); border-radius: 4px; padding: 0 5px; font-size: .72rem; }
.source span { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 220px; }
.source small { color: var(--muted); }
.md a[href^="http"] { text-decoration: none; }

/* Code mode */
.effort-sep { height: 1px; background: var(--line); margin: 4px 8px; }
.effort-opt .code-ico { grid-row: span 2; width: 18px; height: 18px; color: var(--accent); margin-top: 1px; }
.effort-btn .code-ico { width: 15px; height: 15px; color: var(--accent); }