/* ── Variables ──────────────────────────────────────────────────────────── */
:root {
  --bg:        oklch(0.145 0 0);
  --bg-soft:   oklch(0.175 0 0);
  --bg-hover:  oklch(0.205 0 0);
  --line:      oklch(0.25  0 0);
  --line-soft: oklch(0.22  0 0);
  --text:      oklch(0.97  0 0);
  --text-2:    oklch(0.75  0 0);
  --text-3:    oklch(0.55  0 0);
  --text-4:    oklch(0.40  0 0);
  --fg-invert: oklch(0.145 0 0);
  --ok:        oklch(0.78 0.15 150);
  --warn:      oklch(0.80 0.13 70);
  --err:       oklch(0.70 0.17 25);
}
html[data-theme="light"] {
  --bg:        oklch(0.995 0 0);
  --bg-soft:   oklch(0.975 0 0);
  --bg-hover:  oklch(0.955 0 0);
  --line:      oklch(0.89  0 0);
  --line-soft: oklch(0.93  0 0);
  --text:      oklch(0.18  0 0);
  --text-2:    oklch(0.40  0 0);
  --text-3:    oklch(0.55  0 0);
  --text-4:    oklch(0.70  0 0);
  --fg-invert: oklch(0.995 0 0);
  --ok:        oklch(0.52 0.14 150);
  --warn:      oklch(0.58 0.14 60);
  --err:       oklch(0.55 0.18 25);
}

/* ── Base ───────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }
html, body {
  background: var(--bg); color: var(--text);
  font-family: 'Inter', ui-sans-serif, system-ui, sans-serif;
  font-feature-settings: "ss01","cv11";
  -webkit-font-smoothing: antialiased;
}
body { margin: 0; }
.mono { font-family: 'JetBrains Mono', ui-monospace, monospace; }

/* ── Caption (mono uppercase label) ────────────────────────────────────── */
.cap {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10.5px; letter-spacing: .09em;
  text-transform: uppercase; color: var(--text-3);
}

/* ── Hairlines ──────────────────────────────────────────────────────────── */
.hb { border-bottom: 1px solid var(--line-soft); }
.ht { border-top:    1px solid var(--line-soft); }
.hr { border-right:  1px solid var(--line-soft); }

/* ── Buttons ────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .5rem .75rem; border-radius: 4px;
  font-size: 12.5px; font-weight: 500; line-height: 1;
  color: var(--text-2); background: transparent;
  border: 1px solid var(--line-soft);
  transition: all .12s ease; cursor: pointer;
  white-space: nowrap; font-family: inherit;
}
.btn:hover { color: var(--text); background: var(--bg-soft); border-color: var(--line); }
.btn:disabled { opacity: .4; cursor: not-allowed; pointer-events: none; }
.btn-primary {
  color: var(--fg-invert); background: var(--text); border-color: var(--text);
}
.btn-primary:hover { filter: brightness(.92); color: var(--fg-invert); }
html[data-theme="light"] .btn-primary:hover { filter: brightness(1.12); }
.btn-ghost { border-color: transparent; }
.btn-ghost:hover { border-color: transparent; background: var(--bg-soft); }
.btn-sm { padding: .35rem .55rem; font-size: 11.5px; gap: .35rem; }

/* ── Kbd badge ──────────────────────────────────────────────────────────── */
.kbd {
  font-family: 'JetBrains Mono', monospace; font-size: 10.5px;
  padding: 1px 5px; border: 1px solid var(--line); border-radius: 3px;
  color: var(--text-3); background: var(--bg-soft); line-height: 1.3;
}

/* ── Inputs ─────────────────────────────────────────────────────────────── */
.input {
  width: 100%; background: transparent; border: 1px solid var(--line);
  color: var(--text); padding: .6rem .75rem; border-radius: 4px;
  font-size: 13.5px; transition: border-color .15s; font-family: inherit;
}
.input:focus { outline: none; border-color: var(--text-3); }
.input::placeholder { color: var(--text-4); }
.label {
  display: block; font-size: 10.5px; color: var(--text-3);
  letter-spacing: .09em; text-transform: uppercase;
  font-weight: 500; margin-bottom: .4rem;
  font-family: 'JetBrains Mono', monospace;
}

/* ── Sidebar rail ───────────────────────────────────────────────────────── */
#sidebar {
  width: 52px; flex-shrink: 0;
  display: flex; flex-direction: column;
  border-right: 1px solid var(--line-soft);
  background: var(--bg); overflow: hidden;
  transition: width .15s ease;
  position: relative; z-index: 10;
}
#sidebar.expanded { width: 220px; }
.rail-label { opacity: 0; transition: opacity .12s ease; white-space: nowrap; overflow: hidden; }
#sidebar.expanded .rail-label { opacity: 1; }
.rail-item {
  display: flex; align-items: center; gap: 10px;
  padding: 7px 10px; border-radius: 4px; color: var(--text-3);
  font-size: 12.5px; width: 100%; text-align: left;
  background: transparent; border: none; cursor: pointer;
  transition: color .12s, background .12s; font-family: inherit;
}
.rail-item:hover { color: var(--text); background: var(--bg-soft); }
.rail-item.active { color: var(--text); background: var(--bg-soft); }
.rail-item .ico { width: 16px; flex-shrink: 0; display: inline-flex; justify-content: center; }

/* ── Drop zone ──────────────────────────────────────────────────────────── */
.drop {
  position: relative; border: 1px dashed var(--line);
  border-radius: 6px; background: transparent;
  transition: background .15s, border-color .15s; cursor: pointer;
}
.drop:hover { border-color: var(--text-3); background: var(--bg-soft); }
.drop.drag-over { border-color: var(--text); background: var(--bg-soft); }

/* ── Grid background ────────────────────────────────────────────────────── */
.grid-bg {
  background-image:
    linear-gradient(to right,  var(--line-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-soft) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 70% 60% at center, black 0%, transparent 100%);
}

/* ── Workspace tabs ─────────────────────────────────────────────────────── */
.ws-tab {
  position: relative; padding: .65rem .15rem; font-size: 13px;
  color: var(--text-3); border: none; background: transparent;
  cursor: pointer; font-weight: 400; font-family: inherit;
  transition: color .12s;
}
.ws-tab:hover { color: var(--text-2); }
.ws-tab.active { color: var(--text); font-weight: 500; }
.ws-tab.active::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -1px;
  height: 2px; background: var(--text);
}

/* ── Chat as document ───────────────────────────────────────────────────── */
.doc-msg { margin-bottom: 2rem; }
.doc-msg.user { display: flex; flex-direction: column; align-items: flex-end; }
.doc-label {
  font-family: 'JetBrains Mono', monospace; font-size: 10.5px;
  letter-spacing: .09em; text-transform: uppercase; color: var(--text-3);
  margin-bottom: .6rem; display: flex; align-items: center; gap: .75rem;
}
.doc-msg.user .doc-text {
  font-size: 14.5px; color: var(--text); line-height: 1.6;
  max-width: 85%; text-align: right; white-space: pre-wrap;
}

/* Thinking dots */
.thinking-dots { display: flex; align-items: center; gap: 4px; padding: 4px 0; }
.thinking-dots span {
  width: 5px; height: 5px; border-radius: 50%; background: var(--text-3);
  animation: thinking .9s ease-in-out infinite;
}
.thinking-dots span:nth-child(2) { animation-delay: .15s; }
.thinking-dots span:nth-child(3) { animation-delay: .3s; }
@keyframes thinking {
  0%,60%,100% { opacity: .2; transform: translateY(0); }
  30%          { opacity: 1;  transform: translateY(-3px); }
}

/* Streaming cursor */
.cursor-blink::after {
  content: "▊"; margin-left: 2px; color: var(--text-2);
  animation: blink 1s step-end infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* ── Status dot ─────────────────────────────────────────────────────────── */
.dot {
  width: 6px; height: 6px; border-radius: 999px;
  background: var(--ok); display: inline-block; flex-shrink: 0;
}

/* ── Suggested questions ────────────────────────────────────────────────── */
.suggest-item {
  display: flex; align-items: center; gap: .75rem;
  width: 100%; padding: .625rem .75rem; margin: 0 -.75rem;
  border-radius: 4px; background: transparent; border: none;
  cursor: pointer; font-size: 14px; color: var(--text-2);
  text-align: left; font-family: inherit; transition: all .12s;
}
.suggest-item:hover { color: var(--text); background: var(--bg-soft); }
.suggest-item .ico { flex-shrink: 0; color: var(--text-3); display: flex; }
.suggest-item .ico-end { margin-left: auto; opacity: 0; transition: opacity .12s; color: var(--text-4); display: flex; }
.suggest-item:hover .ico-end { opacity: 1; }

/* ── Markdown document ──────────────────────────────────────────────────── */
.doc { color: var(--text); line-height: 1.65; }
.doc h1,.doc h2,.doc h3 { font-weight: 600; letter-spacing: -.015em; color: var(--text); }
.doc h1 { font-size: 26px; margin: 1.4em 0 .5em; line-height: 1.2; }
.doc h2 { font-size: 19px; margin: 1.4em 0 .4em; line-height: 1.25; }
.doc h3 { font-size: 13px; margin: 1.4em 0 .35em; color: var(--text-2); text-transform: uppercase; letter-spacing: .08em; font-weight: 500; }
.doc p  { font-size: 14.5px; margin: .5em 0; }
.doc ul,.doc ol { margin: .5em 0 .5em 1.4em; }
.doc li { font-size: 14.5px; line-height: 1.6; margin: .2em 0; }
.doc ul li { list-style: none; position: relative; padding-left: 14px; }
.doc ul li::before { content: ""; position: absolute; left: 0; top: .7em; width: 6px; height: 1px; background: var(--text-4); }
.doc code { font-family: 'JetBrains Mono', monospace; font-size: .86em; background: var(--bg-soft); padding: 1px 5px; border-radius: 3px; color: var(--text); border: 1px solid var(--line-soft); }
.doc pre { background: var(--bg-soft); border: 1px solid var(--line-soft); border-radius: 4px; padding: .8rem 1rem; overflow-x: auto; font-size: 12.5px; margin: .9em 0; }
.doc pre code { background: transparent; border: none; padding: 0; }
.doc table { width: 100%; border-collapse: collapse; margin: 1em 0; font-size: 13px; }
.doc th,.doc td { text-align: left; padding: .55rem .85rem; border-bottom: 1px solid var(--line-soft); vertical-align: top; }
.doc thead th { color: var(--text-3); font-weight: 500; font-size: 10.5px; text-transform: uppercase; letter-spacing: .08em; border-bottom-color: var(--line); }
.doc strong { color: var(--text); font-weight: 600; }
.doc em { font-style: italic; color: var(--text-2); }
.doc blockquote { border-left: 2px solid var(--line); padding-left: 1rem; color: var(--text-2); margin: .8em 0; }
.doc hr { border: none; border-top: 1px solid var(--line-soft); margin: 1.6em 0; }

/* ── Scrollbar ──────────────────────────────────────────────────────────── */
.scroll-thin::-webkit-scrollbar { width: 10px; height: 10px; }
.scroll-thin::-webkit-scrollbar-thumb { background: var(--line); border-radius: 4px; border: 2px solid var(--bg); background-clip: padding-box; }
.scroll-thin::-webkit-scrollbar-thumb:hover { background: var(--text-4); border: 2px solid var(--bg); background-clip: padding-box; }
.scroll-thin::-webkit-scrollbar-track { background: transparent; }

/* ── Export dropdown ────────────────────────────────────────────────────── */
#export-menu {
  position: absolute; right: 0; top: calc(100% + 4px);
  background: var(--bg-soft); border: 1px solid var(--line);
  border-radius: 4px; z-index: 50; min-width: 140px;
  overflow: hidden; box-shadow: 0 8px 24px rgba(0,0,0,.4);
}
.export-item {
  display: flex; align-items: center; gap: 8px;
  width: 100%; padding: .5rem .75rem;
  font-size: 12.5px; color: var(--text-2); text-align: left;
  background: transparent; border: none; cursor: pointer;
  transition: all .1s; font-family: inherit;
}
.export-item:hover { background: var(--bg-hover); color: var(--text); }

/* ── Command palette ────────────────────────────────────────────────────── */
#cmdk-overlay {
  position: fixed; inset: 0;
  background: color-mix(in oklch, var(--bg) 80%, transparent);
  backdrop-filter: blur(4px); z-index: 50;
}
#cmdk {
  position: fixed; top: 15vh; left: 50%; transform: translateX(-50%);
  width: min(560px, 90vw); background: var(--bg);
  border: 1px solid var(--line); border-radius: 8px; z-index: 51;
  overflow: hidden; box-shadow: 0 24px 64px rgba(0,0,0,.5);
}
.cmdk-item {
  display: flex; align-items: center; gap: 12px;
  width: 100%; padding: .625rem 1rem; text-align: left;
  background: transparent; border: none; cursor: pointer;
  font-size: 13.5px; color: var(--text); font-family: inherit;
  transition: background .08s;
}
.cmdk-item:hover, .cmdk-item.selected { background: var(--bg-soft); }
.cmdk-item .ico { color: var(--text-3); flex-shrink: 0; display: flex; }
.cmdk-item .sub { margin-left: auto; font-size: 11.5px; color: var(--text-3); font-family: 'JetBrains Mono', monospace; }

/* ── Animations ─────────────────────────────────────────────────────────── */
@keyframes fadeUp { from { opacity: 0; transform: translateY(3px); } to { opacity: 1; transform: none; } }
.fade-up { animation: fadeUp .25s ease both; }

/* ── Toggle switch ──────────────────────────────────────────────────────── */
.toggle {
  position: relative; width: 28px; height: 16px;
  border-radius: 999px; background: var(--line); cursor: pointer;
  transition: background .15s; flex-shrink: 0;
}
.toggle.on { background: var(--text); }
.toggle::after {
  content: ""; position: absolute; top: 2px; left: 2px;
  width: 12px; height: 12px; border-radius: 999px;
  background: var(--bg); transition: transform .15s;
}
.toggle.on::after { transform: translateX(12px); background: var(--fg-invert); }

/* ── Auth layout ────────────────────────────────────────────────────────── */
.auth-wrap { width: 100%; max-width: 380px; }

/* ── Utilities ──────────────────────────────────────────────────────────── */
.hidden { display: none !important; }
.t2 { color: var(--text-2); }
.t3 { color: var(--text-3); }
.t4 { color: var(--text-4); }
::selection { background: var(--text); color: var(--fg-invert); }