/* ============================================================
   optimalizace.ai — chat interface
   Editorial paper aesthetic · amber accent · light + dark
   ============================================================ */

:root {
  /* type */
  --font-serif: "Instrument Serif", "Iowan Old Style", Georgia, serif;
  --font-sans: "Geist", ui-sans-serif, system-ui, -apple-system, "Helvetica Neue", sans-serif;
  --font-mono: "Geist Mono", ui-monospace, "SF Mono", Menlo, monospace;

  /* light palette (warm paper) */
  --paper: oklch(0.977 0.006 75);
  --paper-2: oklch(0.962 0.008 75);
  --paper-3: oklch(0.945 0.010 75);
  --line: oklch(0.905 0.010 75);
  --line-strong: oklch(0.855 0.012 75);
  --ink: oklch(0.215 0.012 60);
  --ink-2: oklch(0.380 0.012 60);
  --ink-3: oklch(0.560 0.012 60);
  --ink-4: oklch(0.720 0.010 60);

  --amber: oklch(0.685 0.165 55);
  --amber-ink: oklch(0.420 0.140 50);
  --amber-soft: oklch(0.935 0.055 75);
  --amber-line: oklch(0.880 0.080 70);

  --danger: oklch(0.580 0.180 25);
  --success: oklch(0.620 0.130 145);

  --shadow-xs: 0 1px 0 0 oklch(0.20 0.01 60 / 0.04);
  --shadow-sm: 0 1px 2px oklch(0.20 0.01 60 / 0.06), 0 0 0 0.5px oklch(0.20 0.01 60 / 0.04);
  --shadow-md: 0 2px 4px oklch(0.20 0.01 60 / 0.04), 0 8px 24px oklch(0.20 0.01 60 / 0.08);
  --shadow-pop: 0 12px 32px oklch(0.20 0.01 60 / 0.14), 0 0 0 0.5px oklch(0.20 0.01 60 / 0.08);

  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
}

[data-theme="dark"] {
  --paper: oklch(0.175 0.008 60);
  --paper-2: oklch(0.215 0.010 60);
  --paper-3: oklch(0.255 0.010 60);
  --line: oklch(0.295 0.010 60);
  --line-strong: oklch(0.360 0.012 60);
  --ink: oklch(0.945 0.008 75);
  --ink-2: oklch(0.825 0.010 75);
  --ink-3: oklch(0.665 0.010 75);
  --ink-4: oklch(0.480 0.010 75);

  --amber: oklch(0.770 0.155 60);
  --amber-ink: oklch(0.860 0.130 65);
  --amber-soft: oklch(0.280 0.060 55);
  --amber-line: oklch(0.380 0.090 55);

  --shadow-xs: 0 1px 0 0 oklch(0 0 0 / 0.20);
  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.30), 0 0 0 0.5px oklch(0 0 0 / 0.30);
  --shadow-md: 0 2px 4px oklch(0 0 0 / 0.25), 0 8px 24px oklch(0 0 0 / 0.40);
  --shadow-pop: 0 12px 32px oklch(0 0 0 / 0.50), 0 0 0 0.5px oklch(0 0 0 / 0.40);
}

* { box-sizing: border-box; }

html, body, #root {
  height: 100%;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  font-feature-settings: "ss01", "cv11";
  color: var(--ink);
  background: var(--paper);
  font-size: 14px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

button {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

input, textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

::selection { background: var(--amber-soft); color: var(--amber-ink); }

/* ============================================================
   APP SHELL
   ============================================================ */

.app {
  display: grid;
  grid-template-columns: 272px 1fr;
  height: 100vh;
  background: var(--paper);
  overflow: hidden;
}

.app.sidebar-collapsed { grid-template-columns: 0 1fr; }

/* ============================================================
   SIDEBAR
   ============================================================ */

.sidebar {
  background: var(--paper-2);
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

.sidebar-head {
  padding: 18px 16px 12px;
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px solid var(--line);
}

.brand-mark {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: var(--ink);
  color: var(--paper);
  display: grid;
  place-items: center;
  font-family: var(--font-serif);
  font-size: 19px;
  line-height: 1;
  font-style: italic;
  letter-spacing: -0.02em;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}
.brand-text .title {
  font-family: var(--font-serif);
  font-size: 18px;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.brand-text .sub {
  font-size: 11px;
  color: var(--ink-3);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.sidebar-collapse {
  margin-left: auto;
  width: 26px;
  height: 26px;
  border-radius: 6px;
  display: grid;
  place-items: center;
  color: var(--ink-3);
  transition: background 0.15s, color 0.15s;
}
.sidebar-collapse:hover { background: var(--paper-3); color: var(--ink); }

.new-chat-row {
  padding: 12px 12px 8px;
  display: flex;
  gap: 6px;
}

.new-chat {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  background: var(--ink);
  color: var(--paper);
  border-radius: var(--radius);
  font-weight: 500;
  font-size: 13px;
  transition: opacity 0.15s, transform 0.05s;
}
.new-chat:hover { opacity: 0.88; }
.new-chat:active { transform: translateY(1px); }
.new-chat .kbd {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 10px;
  color: oklch(from var(--paper) l c h / 0.55);
  padding: 1px 5px;
  border: 1px solid oklch(from var(--paper) l c h / 0.20);
  border-radius: 4px;
}

.icon-btn {
  width: 34px;
  height: 34px;
  border-radius: var(--radius);
  background: var(--paper);
  border: 1px solid var(--line);
  display: grid;
  place-items: center;
  color: var(--ink-2);
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}
.icon-btn:hover { background: var(--paper-3); color: var(--ink); border-color: var(--line-strong); }

.search {
  margin: 0 12px 12px;
  position: relative;
  display: flex;
  align-items: center;
}
.search svg { position: absolute; left: 10px; color: var(--ink-4); pointer-events: none; }
.search input {
  width: 100%;
  padding: 7px 10px 7px 32px;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  outline: none;
  font-size: 13px;
  transition: border-color 0.15s, background 0.15s;
}
.search input:focus { border-color: var(--line-strong); background: var(--paper); }
.search input::placeholder { color: var(--ink-4); }
.search .kbd-hint {
  position: absolute;
  right: 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--ink-4);
  padding: 1px 5px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--paper);
}

.sidebar-scroll {
  flex: 1;
  overflow-y: auto;
  padding: 4px 8px 16px;
  scrollbar-width: thin;
  scrollbar-color: var(--line-strong) transparent;
}
.sidebar-scroll::-webkit-scrollbar { width: 8px; }
.sidebar-scroll::-webkit-scrollbar-thumb { background: var(--line); border-radius: 4px; }

.sb-section {
  margin-top: 10px;
}
.sb-section-head {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 8px;
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-3);
  font-weight: 500;
}
.sb-section-head .count {
  color: var(--ink-4);
  font-weight: 400;
}
.sb-section-head .add-btn {
  margin-left: auto;
  width: 20px;
  height: 20px;
  border-radius: 5px;
  display: grid;
  place-items: center;
  color: var(--ink-3);
}
.sb-section-head .add-btn:hover { background: var(--paper-3); color: var(--ink); }

.project {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 7px 10px;
  border-radius: 8px;
  color: var(--ink-2);
  cursor: pointer;
  font-size: 13px;
  transition: background 0.12s;
  position: relative;
}
.project:hover { background: var(--paper-3); color: var(--ink); }
.project .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  flex-shrink: 0;
}
.project .meta {
  margin-left: auto;
  font-size: 11px;
  color: var(--ink-4);
  font-variant-numeric: tabular-nums;
}

.chat-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 8px 10px;
  border-radius: 8px;
  cursor: pointer;
  color: var(--ink-2);
  transition: background 0.12s, color 0.12s;
  position: relative;
}
.chat-item:hover { background: var(--paper-3); color: var(--ink); }
.chat-item.active {
  background: var(--paper);
  color: var(--ink);
  box-shadow: var(--shadow-xs), inset 0 0 0 1px var(--line);
}
.chat-item.active::before {
  content: "";
  position: absolute;
  left: -8px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: var(--amber);
  border-radius: 2px;
}
.chat-item .title {
  font-size: 13px;
  font-weight: 450;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  letter-spacing: -0.005em;
}
.chat-item .preview {
  font-size: 11.5px;
  color: var(--ink-4);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  letter-spacing: -0.005em;
}

.day-label {
  font-size: 10.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-4);
  padding: 14px 10px 4px;
  font-weight: 500;
}

.sidebar-foot {
  border-top: 1px solid var(--line);
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: var(--paper-2);
}

.user-card {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 8px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.12s;
}
.user-card:hover { background: var(--paper-3); }

.avatar {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--amber) 0%, var(--amber-ink) 100%);
  color: oklch(0.99 0 0);
  display: grid;
  place-items: center;
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 0.02em;
}

.user-card .info {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}
.user-card .info .name { font-size: 13px; font-weight: 500; color: var(--ink); }
.user-card .info .plan { font-size: 11px; color: var(--ink-3); }
.user-card .chevron { color: var(--ink-3); }

/* ============================================================
   MAIN
   ============================================================ */

.main {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
  position: relative;
}

.topbar {
  height: 56px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 18px;
  border-bottom: 1px solid var(--line);
  background: oklch(from var(--paper) l c h / 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 5;
}

.show-sb {
  width: 30px; height: 30px;
  border-radius: 7px;
  display: grid; place-items: center;
  color: var(--ink-3);
  margin-right: 2px;
}
.show-sb:hover { background: var(--paper-3); color: var(--ink); }

.crumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--ink-3);
  min-width: 0;
  flex: 1;
}
.crumbs .sep { color: var(--ink-4); }
.crumbs .current {
  color: var(--ink);
  font-weight: 450;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
}
.crumbs .project-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 8px;
  border-radius: 6px;
  background: var(--paper-3);
  color: var(--ink-2);
  font-size: 12px;
}
.crumbs .project-tag .dot { width: 6px; height: 6px; border-radius: 50%; }

.topbar-spacer { flex: 1; }

.model-switcher {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px 6px 12px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--paper);
  font-size: 13px;
  transition: border-color 0.15s, background 0.15s;
  position: relative;
  cursor: pointer;
}
.model-switcher:hover { border-color: var(--line-strong); background: var(--paper-2); }
.model-switcher .badge {
  font-family: var(--font-mono);
  font-size: 10px;
  padding: 2px 5px;
  border-radius: 4px;
  background: var(--amber-soft);
  color: var(--amber-ink);
  letter-spacing: 0.02em;
}

.model-switcher .model-name {
  font-weight: 500;
  color: var(--ink);
  letter-spacing: -0.005em;
}

.dropdown {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  min-width: 280px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-pop);
  padding: 6px;
  z-index: 30;
  animation: dropIn 0.12s ease-out;
}
.dropdown.left { left: 0; right: auto; }
@keyframes dropIn { from { opacity: 0; transform: translateY(-4px); } to { opacity: 1; transform: translateY(0); } }

.dd-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 9px 10px;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.12s;
  width: 100%;
  text-align: left;
}
.dd-item:hover { background: var(--paper-2); }
.dd-item .dd-icon {
  width: 30px;
  height: 30px;
  border-radius: 7px;
  background: var(--paper-2);
  display: grid;
  place-items: center;
  color: var(--ink-2);
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: -0.02em;
}
.dd-item .dd-icon.amber { background: var(--amber-soft); color: var(--amber-ink); }
.dd-item .dd-body { flex: 1; min-width: 0; }
.dd-item .dd-title { font-size: 13px; font-weight: 500; color: var(--ink); display: flex; align-items: center; gap: 6px; }
.dd-item .dd-desc { font-size: 11.5px; color: var(--ink-3); margin-top: 1px; line-height: 1.4; }
.dd-item.active { background: var(--paper-2); }
.dd-item.active .check { color: var(--amber); }
.dd-item .check { color: transparent; align-self: center; }

.dd-sep { height: 1px; background: var(--line); margin: 4px 2px; }

.dd-meta-row {
  display: flex;
  gap: 8px;
  padding: 2px 0 0;
  font-size: 11px;
  color: var(--ink-3);
}
.dd-meta-row .pill {
  padding: 1px 6px;
  border-radius: 4px;
  background: var(--paper-3);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.02em;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 4px;
}

.tb-btn {
  height: 32px;
  padding: 0 10px;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--ink-2);
  font-size: 12.5px;
  transition: background 0.12s, color 0.12s;
}
.tb-btn:hover { background: var(--paper-3); color: var(--ink); }
.tb-btn.icon-only { padding: 0; width: 32px; justify-content: center; }

.lang-toggle {
  display: inline-flex;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
}
.lang-toggle button {
  padding: 3px 8px;
  border-radius: 6px;
  color: var(--ink-3);
  font-weight: 500;
  transition: background 0.12s, color 0.12s;
}
.lang-toggle button.active {
  background: var(--paper);
  color: var(--ink);
  box-shadow: var(--shadow-xs);
}

/* ============================================================
   CHAT BODY
   ============================================================ */

.chat-body {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  scroll-behavior: smooth;
}

.chat-body::-webkit-scrollbar { width: 10px; }
.chat-body::-webkit-scrollbar-thumb { background: var(--line); border-radius: 6px; }
.chat-body::-webkit-scrollbar-thumb:hover { background: var(--line-strong); }

.chat-inner {
  max-width: 760px;
  width: 100%;
  margin: 0 auto;
  padding: 32px 32px 24px;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

/* ---------- welcome state ---------- */

.welcome {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 64px 32px;
  text-align: center;
}

.welcome .mark {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  background: var(--paper-2);
  border: 1px solid var(--line);
  display: grid;
  place-items: center;
  margin-bottom: 22px;
  position: relative;
}
.welcome .mark .glyph {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 34px;
  color: var(--amber);
  line-height: 1;
  letter-spacing: -0.04em;
}
.welcome .mark::after {
  content: "";
  position: absolute;
  inset: -6px;
  border-radius: 22px;
  border: 1px dashed var(--line);
  opacity: 0.6;
}

.welcome h1 {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 44px;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin: 0 0 10px;
  max-width: 600px;
}
.welcome h1 em {
  font-style: italic;
  color: var(--amber-ink);
}

.welcome .lead {
  font-size: 15px;
  color: var(--ink-3);
  max-width: 480px;
  line-height: 1.55;
  margin: 0 0 36px;
}

.prompt-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  max-width: 640px;
  width: 100%;
}

.prompt-card {
  padding: 14px 16px;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  cursor: pointer;
  text-align: left;
  transition: background 0.15s, border-color 0.15s, transform 0.1s;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.prompt-card:hover {
  background: var(--paper);
  border-color: var(--line-strong);
  transform: translateY(-1px);
}
.prompt-card .tag {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--amber-ink);
}
.prompt-card .text {
  font-size: 13.5px;
  color: var(--ink);
  letter-spacing: -0.005em;
  line-height: 1.45;
}

/* ---------- suggestions row below welcome ---------- */

.suggestion-rail {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 24px;
  max-width: 640px;
}
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 12.5px;
  color: var(--ink-2);
  cursor: pointer;
  transition: background 0.12s, color 0.12s, border-color 0.12s;
}
.chip:hover { background: var(--paper); color: var(--ink); border-color: var(--line-strong); }

/* ---------- messages ---------- */

.msg {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.msg-avatar {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  flex-shrink: 0;
  display: grid;
  place-items: center;
  font-size: 12px;
  font-weight: 600;
  margin-top: 1px;
}
.msg-avatar.user {
  background: var(--paper-3);
  color: var(--ink);
  border: 1px solid var(--line);
}
.msg-avatar.assistant {
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 16px;
  letter-spacing: -0.02em;
}

.msg-body {
  flex: 1;
  min-width: 0;
}
.msg-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
}
.msg-head .who {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.005em;
}
.msg-head .who.assistant { font-family: var(--font-serif); font-weight: 400; font-style: italic; font-size: 15px; }
.msg-head .meta {
  font-size: 11px;
  color: var(--ink-4);
  font-variant-numeric: tabular-nums;
}
.msg-head .model-pill {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--ink-3);
  padding: 1px 5px;
  border-radius: 4px;
  background: var(--paper-2);
}

.msg-content {
  font-size: 14.5px;
  color: var(--ink);
  line-height: 1.65;
  letter-spacing: -0.003em;
}
.msg-content > * + * { margin-top: 12px; }
.msg-content p { margin: 0; text-wrap: pretty; }
.msg-content strong { font-weight: 600; color: var(--ink); }
.msg-content em { font-style: italic; }
.msg-content a {
  color: var(--amber-ink);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}
.msg-content ul, .msg-content ol {
  margin: 0;
  padding-left: 22px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.msg-content li::marker { color: var(--ink-4); }

.msg-content h3 {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 22px;
  letter-spacing: -0.015em;
  margin: 0;
  color: var(--ink);
}

.msg-content blockquote {
  margin: 0;
  padding: 8px 14px;
  border-left: 2px solid var(--amber);
  color: var(--ink-2);
  font-family: var(--font-serif);
  font-size: 16px;
  font-style: italic;
}

.msg-content code:not(pre code) {
  font-family: var(--font-mono);
  font-size: 0.88em;
  padding: 1px 5px;
  border-radius: 4px;
  background: var(--paper-3);
  color: var(--amber-ink);
  border: 1px solid var(--line);
}

/* ---------- code block ---------- */

.codeblock {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--paper-2);
}
.codeblock .head {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px 7px 12px;
  border-bottom: 1px solid var(--line);
  background: var(--paper-3);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-3);
  letter-spacing: 0.02em;
}
.codeblock .head .lang {
  text-transform: uppercase;
  color: var(--ink-2);
  font-weight: 600;
}
.codeblock .head .file { color: var(--ink-3); }
.codeblock .head .copy {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: var(--ink-3);
  padding: 3px 7px;
  border-radius: 5px;
  font-family: var(--font-sans);
  font-size: 11px;
  transition: background 0.12s, color 0.12s;
}
.codeblock .head .copy:hover { background: var(--paper); color: var(--ink); }

.codeblock pre {
  margin: 0;
  padding: 14px 16px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--ink);
  background: transparent;
}
.codeblock pre code { font-family: inherit; background: none; padding: 0; border: 0; color: inherit; }

/* syntax tokens */
.tk-k { color: oklch(0.50 0.18 290); font-weight: 500; }
.tk-s { color: oklch(0.48 0.13 145); }
.tk-n { color: oklch(0.55 0.14 50); }
.tk-c { color: var(--ink-4); font-style: italic; }
.tk-f { color: oklch(0.50 0.15 240); font-weight: 500; }
.tk-t { color: oklch(0.50 0.14 25); }
.tk-p { color: var(--ink-3); }

[data-theme="dark"] .tk-k { color: oklch(0.80 0.18 290); }
[data-theme="dark"] .tk-s { color: oklch(0.80 0.15 145); }
[data-theme="dark"] .tk-n { color: oklch(0.82 0.13 60); }
[data-theme="dark"] .tk-c { color: var(--ink-4); }
[data-theme="dark"] .tk-f { color: oklch(0.78 0.13 240); }
[data-theme="dark"] .tk-t { color: oklch(0.80 0.14 30); }
[data-theme="dark"] .tk-p { color: var(--ink-3); }

/* ---------- citations ---------- */

.cite-ref {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  background: var(--amber-soft);
  color: var(--amber-ink);
  border: 1px solid var(--amber-line);
  border-radius: 4px;
  vertical-align: 1px;
  margin: 0 2px;
  cursor: pointer;
  transition: background 0.12s;
}
.cite-ref:hover { background: var(--amber); color: oklch(0.99 0 0); }

.sources {
  margin-top: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-2);
  overflow: hidden;
}
.sources .head {
  padding: 9px 14px;
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-3);
  font-weight: 500;
}
.sources .head .count { color: var(--ink-4); }
.sources .list { display: flex; flex-direction: column; }
.source {
  display: grid;
  grid-template-columns: 26px 1fr auto;
  gap: 12px;
  align-items: center;
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  cursor: pointer;
  transition: background 0.12s;
}
.source:first-child { border-top: none; }
.source:hover { background: var(--paper-3); }
.source .num {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  color: var(--amber-ink);
  background: var(--amber-soft);
  border: 1px solid var(--amber-line);
  width: 22px; height: 22px;
  border-radius: 5px;
  display: grid;
  place-items: center;
}
.source .info { min-width: 0; }
.source .info .title {
  font-size: 13px;
  color: var(--ink);
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  letter-spacing: -0.005em;
}
.source .info .domain {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-3);
  margin-top: 1px;
}
.source .ext {
  color: var(--ink-4);
}

/* ---------- msg actions ---------- */

.msg-actions {
  display: flex;
  gap: 2px;
  margin-top: 10px;
  opacity: 0;
  transition: opacity 0.15s;
}
.msg:hover .msg-actions { opacity: 1; }
.msg-actions button {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  display: grid;
  place-items: center;
  color: var(--ink-3);
  transition: background 0.12s, color 0.12s;
}
.msg-actions button:hover { background: var(--paper-3); color: var(--ink); }
.msg-actions .label { font-size: 11px; padding: 0 8px; width: auto; gap: 5px; display: inline-flex; align-items: center; }

/* ---------- composer ---------- */

.composer-wrap {
  border-top: 1px solid var(--line);
  background: oklch(from var(--paper) l c h / 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 14px 24px 18px;
}

.composer {
  max-width: 760px;
  margin: 0 auto;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  padding: 12px 14px 8px;
  transition: border-color 0.15s, box-shadow 0.15s, background 0.15s;
}
.composer:focus-within {
  border-color: var(--amber-line);
  background: var(--paper);
  box-shadow: 0 0 0 4px var(--amber-soft);
}

.composer textarea {
  width: 100%;
  border: none;
  outline: none;
  background: transparent;
  resize: none;
  font-size: 14.5px;
  line-height: 1.55;
  color: var(--ink);
  min-height: 24px;
  max-height: 200px;
  letter-spacing: -0.003em;
}
.composer textarea::placeholder { color: var(--ink-4); }

.composer-toolbar {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-top: 8px;
}

.tool-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  height: 28px;
  padding: 0 9px;
  border-radius: 7px;
  color: var(--ink-3);
  font-size: 12px;
  transition: background 0.12s, color 0.12s;
}
.tool-btn:hover { background: var(--paper-3); color: var(--ink); }
.tool-btn.icon { padding: 0; width: 28px; justify-content: center; }
.tool-btn.active {
  background: var(--amber-soft);
  color: var(--amber-ink);
}

.composer-spacer { flex: 1; }

.send-btn {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: var(--ink);
  color: var(--paper);
  display: grid;
  place-items: center;
  transition: opacity 0.15s, transform 0.05s, background 0.15s;
}
.send-btn:hover { opacity: 0.9; }
.send-btn:active { transform: translateY(1px); }
.send-btn.armed { background: var(--amber); }
.send-btn:disabled {
  background: var(--paper-3);
  color: var(--ink-4);
  cursor: not-allowed;
}

.composer-meta {
  max-width: 760px;
  margin: 8px auto 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 11px;
  color: var(--ink-4);
}
.composer-meta .left { display: inline-flex; gap: 14px; align-items: center; }
.composer-meta .kbd {
  font-family: var(--font-mono);
  font-size: 10px;
  padding: 1px 5px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--paper-2);
  color: var(--ink-3);
  margin: 0 2px;
}

/* ---------- streaming caret ---------- */
.caret {
  display: inline-block;
  width: 7px;
  height: 14px;
  background: var(--amber);
  vertical-align: -2px;
  border-radius: 1px;
  animation: blink 1s steps(2) infinite;
  margin-left: 2px;
}
@keyframes blink { 50% { opacity: 0; } }

/* utility */
.hidden { display: none !important; }