/* ---------- тема ---------- */
:root {
  color-scheme: light;
  --bg: #f4f5f7;
  --panel: #ffffff;
  --panel-2: #eef0f4;
  --border: #e1e4e9;
  --text: #15171c;
  --muted: #6b7280;
  --accent: #4f46e5;
  --accent-2: #4338ca;
  --on-accent: #ffffff;
  --asst-bubble: #ffffff;
  --user-bubble: #4f46e5;
  --user-text: #ffffff;
  --danger: #dc2626;
  --code-bg: #f6f8fa;
  --shadow: 0 6px 24px rgba(15, 17, 28, 0.08);
  --radius: 14px;
  --sidebar-w: 284px;
}
html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0e1014;
  --panel: #16181e;
  --panel-2: #1c1f26;
  --border: #2a2e37;
  --text: #e7e9ee;
  --muted: #99a1af;
  --accent: #6366f1;
  --accent-2: #818cf8;
  --on-accent: #ffffff;
  --asst-bubble: #181b22;
  --user-bubble: #4338ca;
  --user-text: #ffffff;
  --danger: #f87171;
  --code-bg: #0b0d12;
  --shadow: 0 8px 28px rgba(0, 0, 0, 0.45);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Color Emoji", sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}
button, input, textarea, select { font: inherit; color: inherit; }

/* ---------- каркас ---------- */
.app { display: grid; grid-template-columns: var(--sidebar-w) 1fr; height: 100dvh; }

.sidebar {
  display: flex; flex-direction: column; min-width: 0;
  background: var(--panel); border-right: 1px solid var(--border);
}
.sidebar-head { padding: 14px; display: flex; flex-direction: column; gap: 12px; }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 700; letter-spacing: .2px; }
.brand-dot { width: 12px; height: 12px; border-radius: 4px; background: linear-gradient(135deg, var(--accent), #22d3ee); }
.sidebar-foot { padding: 12px 14px 16px; border-top: 1px solid var(--border); }

.chat-list { flex: 1; overflow-y: auto; padding: 6px 8px; display: flex; flex-direction: column; gap: 2px; }
.chat-item {
  display: flex; align-items: center; gap: 8px;
  padding: 9px 10px; border-radius: 10px; cursor: pointer;
  color: var(--text); border: 1px solid transparent;
}
.chat-item:hover { background: var(--panel-2); }
.chat-item.active { background: color-mix(in srgb, var(--accent) 12%, transparent); border-color: color-mix(in srgb, var(--accent) 30%, transparent); }
.chat-item .ci-title { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.chat-item .ci-del {
  opacity: 0; border: 0; background: transparent; color: var(--muted);
  cursor: pointer; padding: 2px 4px; border-radius: 6px; line-height: 1;
}
.chat-item:hover .ci-del { opacity: 1; }
.chat-item .ci-del:hover { color: var(--danger); background: var(--panel-2); }

.main { display: flex; flex-direction: column; min-width: 0; height: 100dvh; }

.topbar {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 14px; border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--panel) 88%, transparent);
  backdrop-filter: blur(8px);
}
.title-block { flex: 1; min-width: 0; }
.chat-title { font-weight: 650; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.chat-sub { font-size: 12px; color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.model-select {
  max-width: 190px; background: var(--panel-2); border: 1px solid var(--border);
  border-radius: 10px; padding: 7px 10px; cursor: pointer;
}

/* ---------- кнопки ---------- */
.btn {
  border: 1px solid var(--border); background: var(--panel-2); color: var(--text);
  border-radius: 10px; padding: 8px 14px; cursor: pointer; transition: .15s background, .15s border-color, .15s opacity;
  user-select: none;
}
.btn:hover { background: color-mix(in srgb, var(--text) 7%, var(--panel-2)); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn.wide { width: 100%; }
.btn.icon { padding: 8px 11px; min-width: 40px; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--on-accent); font-weight: 600; }
.btn.primary:hover { background: var(--accent-2); border-color: var(--accent-2); }
.btn.ghost { background: transparent; }
.btn.danger { color: var(--danger); border-color: color-mix(in srgb, var(--danger) 40%, var(--border)); background: transparent; }

/* ---------- сообщения ---------- */
.messages { flex: 1; overflow-y: auto; padding: 22px 18px 8px; scroll-behavior: smooth; }
.messages-inner { max-width: 900px; margin: 0 auto; }

.msg { display: flex; gap: 12px; margin-bottom: 20px; }
.msg.user { flex-direction: row-reverse; }
.avatar {
  flex: 0 0 34px; width: 34px; height: 34px; border-radius: 10px;
  display: grid; place-items: center; font-size: 12px; font-weight: 700;
  background: var(--panel-2); border: 1px solid var(--border); color: var(--muted);
}
.msg.user .avatar { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.bubble {
  max-width: min(760px, 84%); border-radius: var(--radius); padding: 12px 15px;
  background: var(--asst-bubble); border: 1px solid var(--border); box-shadow: var(--shadow);
  overflow-wrap: anywhere; min-width: 0;
}
.msg.user .bubble { background: var(--user-bubble); color: var(--user-text); border-color: transparent; }
.msg.assistant { align-items: flex-start; }

.reasoning { margin: -2px 0 10px; }
.reasoning summary {
  cursor: pointer; font-size: 12.5px; color: var(--muted); list-style: none;
  display: inline-flex; align-items: center; gap: 6px; padding: 3px 8px;
  border: 1px dashed var(--border); border-radius: 999px;
}
.reasoning summary::-webkit-details-marker { display: none; }
.reasoning[open] summary { margin-bottom: 8px; }
.reasoning-body {
  white-space: pre-wrap; font-size: 13px; color: var(--muted);
  border-left: 2px solid var(--border); padding-left: 10px; max-height: 320px; overflow: auto;
}
.content { min-width: 0; }
.content.streaming { white-space: pre-wrap; }
.content:empty::after { content: "…"; color: var(--muted); }

.content p { margin: 0 0 10px; }
.content p:last-child { margin-bottom: 0; }
.content ul, .content ol { margin: 0 0 10px; padding-left: 22px; }
.content li { margin: 3px 0; }
.content h1, .content h2, .content h3 { margin: 14px 0 8px; line-height: 1.3; }
.content h1 { font-size: 1.4em; } .content h2 { font-size: 1.22em; } .content h3 { font-size: 1.08em; }
.content a { color: var(--accent-2); }
.content blockquote { margin: 0 0 10px; padding: 4px 12px; border-left: 3px solid var(--border); color: var(--muted); }
.content table { border-collapse: collapse; margin: 0 0 10px; display: block; overflow-x: auto; max-width: 100%; }
.content th, .content td { border: 1px solid var(--border); padding: 6px 10px; text-align: left; }
.content hr { border: 0; border-top: 1px solid var(--border); margin: 14px 0; }
.content img { max-width: 100%; border-radius: 8px; }

.content pre {
  position: relative; background: var(--code-bg); border: 1px solid var(--border);
  border-radius: 10px; padding: 12px; overflow-x: auto; margin: 0 0 10px;
}
.content pre code { background: none; padding: 0; font-size: 13px; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.content code { background: var(--code-bg); border: 1px solid var(--border); border-radius: 6px; padding: 1px 5px; font-size: .9em; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.copy-code {
  position: absolute; top: 8px; right: 8px; font-size: 11px; padding: 2px 8px;
  border-radius: 7px; border: 1px solid var(--border); background: var(--panel);
  color: var(--muted); cursor: pointer; opacity: 0; transition: opacity .15s;
}
.content pre:hover .copy-code { opacity: 1; }

.atts { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 8px; }
.att-chip {
  display: inline-flex; align-items: center; gap: 6px; font-size: 12.5px;
  background: color-mix(in srgb, currentColor 10%, transparent); border-radius: 8px; padding: 4px 9px;
  max-width: 100%;
}
.att-chip .att-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 220px; }
.att-thumb { max-height: 180px; max-width: 100%; border-radius: 10px; display: block; margin-bottom: 8px; }
body:not(.dark) .att-chip { background: rgba(0,0,0,.06); }

.msg-actions { display: flex; gap: 4px; margin-top: 8px; opacity: 0; transition: opacity .15s; }
.msg:hover .msg-actions, .msg:focus-within .msg-actions { opacity: 1; }
.msg-actions button {
  font-size: 12px; padding: 3px 9px; border-radius: 8px; border: 1px solid var(--border);
  background: transparent; color: var(--muted); cursor: pointer;
}
.msg-actions button:hover { color: var(--text); background: var(--panel-2); }
.msg.error .bubble { border-color: color-mix(in srgb, var(--danger) 55%, var(--border)); }
.err-note { color: var(--danger); font-size: 13.5px; }

/* пустой экран */
.empty { max-width: 620px; margin: 8vh auto 0; text-align: center; color: var(--muted); }
.empty h1 { font-size: 26px; color: var(--text); margin-bottom: 8px; }
.empty .chips { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-top: 20px; }
.empty .chip {
  border: 1px solid var(--border); background: var(--panel); border-radius: 999px;
  padding: 8px 14px; cursor: pointer; color: var(--text);
}
.empty .chip:hover { background: var(--panel-2); }

/* ---------- ввод ---------- */
.composer { border-top: 1px solid var(--border); background: var(--panel); padding: 10px 14px 12px; }
.composer-inner { max-width: 900px; margin: 0 auto; }
.composer-row { display: flex; align-items: flex-end; gap: 8px; }
.composer-row textarea {
  flex: 1; resize: none; max-height: 220px; min-height: 44px; padding: 11px 12px;
  border: 1px solid var(--border); border-radius: 12px; background: var(--bg); outline: none;
  line-height: 1.5;
}
.composer-row textarea:focus { border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent); }
.composer-hint { font-size: 11.5px; color: var(--muted); margin: 7px 4px 0; text-align: center; }
.attachments { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 8px; }
.attachments .att-chip button { border: 0; background: transparent; cursor: pointer; color: inherit; opacity: .7; }
.attachments .att-chip button:hover { opacity: 1; }

/* ---------- оверлей перетаскивания ---------- */
.drop-overlay {
  position: fixed; inset: 0; z-index: 40; display: grid; place-items: center;
  background: color-mix(in srgb, var(--bg) 72%, transparent); backdrop-filter: blur(3px);
}
.drop-overlay[hidden] { display: none; }
.drop-card { border: 2px dashed var(--accent); border-radius: 18px; padding: 26px 34px; background: var(--panel); font-weight: 600; }

/* ---------- модалка ---------- */
.modal { position: fixed; inset: 0; z-index: 50; display: grid; place-items: center; background: rgba(0,0,0,.45); padding: 16px; }
.modal[hidden] { display: none; }
.modal-card { width: min(560px, 100%); max-height: 88dvh; overflow: auto; background: var(--panel); border: 1px solid var(--border); border-radius: 16px; box-shadow: var(--shadow); }
.modal-head { display: flex; align-items: center; justify-content: space-between; padding: 16px 18px; border-bottom: 1px solid var(--border); }
.modal-head h2 { margin: 0; font-size: 18px; }
.modal-body { padding: 18px; display: flex; flex-direction: column; gap: 16px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field-label { font-size: 13.5px; font-weight: 600; }
.field input[type="text"], .field input[type="password"], .field input[type="number"], .field textarea, #set-access, #set-system, #set-max-tokens {
  width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: 10px; background: var(--bg); outline: none;
}
.field textarea { resize: vertical; }
.field input:focus, .field textarea:focus { border-color: var(--accent); }
.field-hint { font-size: 12px; color: var(--muted); }
.check { display: flex; align-items: center; gap: 8px; font-size: 14px; }
.modal-actions { display: flex; justify-content: space-between; gap: 10px; margin-top: 4px; }

/* ---------- тост ---------- */
.toast {
  position: fixed; left: 50%; bottom: 26px; transform: translateX(-50%);
  background: var(--panel); border: 1px solid var(--border); color: var(--text);
  padding: 11px 16px; border-radius: 12px; box-shadow: var(--shadow); z-index: 60;
  max-width: 92vw; font-size: 14px;
}
.toast[hidden] { display: none; }
.toast.error { border-color: color-mix(in srgb, var(--danger) 60%, var(--border)); }
.toast.info { border-color: color-mix(in srgb, var(--accent) 50%, var(--border)); }

/* ---------- адаптив ---------- */
.scrim { display: none; }
@media (max-width: 860px) {
  .app { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed; z-index: 30; top: 0; bottom: 0; left: 0; width: var(--sidebar-w);
    transform: translateX(-104%); transition: transform .22s ease; box-shadow: var(--shadow);
  }
  body.sidebar-open .sidebar { transform: translateX(0); }
  body.sidebar-open .scrim { display: block; position: fixed; inset: 0; z-index: 20; background: rgba(0,0,0,.4); }
  .bubble { max-width: 88%; }
  .model-select { max-width: 130px; }
}
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; scroll-behavior: auto !important; }
}