/* ─────────────────────────────────────────────────────────────────────────────
   arena.css — three-pane agentic playground
   ───────────────────────────────────────────────────────────────────────── */

/* ── Theme tokens ─────────────────────────────────────────────────────────── */
:root {
  --bg:           #0c0c0c;
  --panel:        #161616;
  --panel-2:      #1d1d1d;
  --panel-3:      #111111;
  --canvas-bg:    #0c0c0c;
  --canvas-dot:   #2a2a2a;
  --border:       #262626;
  --border-soft:  #1f1f1f;
  --text:         #e8e8e8;
  --text-strong:  #ffffff;
  --muted:        #888;
  --muted-2:      #666;
  --accent:       #6366f1;
  --accent-soft:  #6366f126;
  --accent-text:  #ffffff;
  --ok:           #22c55e;
  --warn:         #eab308;
  --err:          #ef4444;
  --err-bg:       #2a0e0e;
  --err-text:     #fca5a5;
  --err-border:   #5a1f1f;
  --input-bg:     #0d0d0d;
  --tool-bg:      #131313;
  --shadow:       0 1px 2px rgba(0,0,0,0.3);
  --shadow-lg:    0 4px 16px rgba(0,0,0,0.35);
}

:root[data-theme="light"] {
  --bg:           #f5f5f5;
  --panel:        #ffffff;
  --panel-2:      #f7f7f7;
  --panel-3:      #fafafa;
  --canvas-bg:    #f5f5f5;
  --canvas-dot:   #d4d4d4;
  --border:       #e5e5e5;
  --border-soft:  #f0f0f0;
  --text:         #1a1a1a;
  --text-strong:  #000000;
  --muted:        #666666;
  --muted-2:      #888888;
  --accent:       #6366f1;
  --accent-soft:  #6366f114;
  --accent-text:  #ffffff;
  --ok:           #16a34a;
  --warn:         #ca8a04;
  --err:          #dc2626;
  --err-bg:       #fef2f2;
  --err-text:     #991b1b;
  --err-border:   #fca5a5;
  --input-bg:     #ffffff;
  --tool-bg:      #fafafa;
  --shadow:       0 1px 2px rgba(0,0,0,0.04);
  --shadow-lg:    0 4px 20px rgba(0,0,0,0.08);
}

* { box-sizing: border-box; }

html, body {
  margin: 0; height: 100%;
  background: var(--bg); color: var(--text);
  font-family: 'IBM Plex Mono', ui-monospace, Menlo, monospace;
  font-size: 14px;
  overflow: hidden;
  transition: background 0.2s, color 0.2s;
}

::-webkit-scrollbar         { width: 10px; height: 10px; }
::-webkit-scrollbar-track   { background: transparent; }
::-webkit-scrollbar-thumb   { background: var(--border); border-radius: 5px; }
::-webkit-scrollbar-thumb:hover { background: var(--muted-2); }

/* ── WebGPU gate ──────────────────────────────────────────────────────────── */
#webgpu-wall {
  display: none; position: fixed; inset: 0; z-index: 9999;
  background: var(--bg); color: var(--text);
  flex-direction: column; align-items: center; justify-content: center;
  text-align: center; padding: 2rem; gap: 1rem;
}
#webgpu-wall.show { display: flex; }
#webgpu-wall h2 { margin: 0; }
#webgpu-wall p { color: var(--muted); max-width: 420px; line-height: 1.6; margin: 0; }
#webgpu-wall a { color: var(--accent); text-decoration: none; margin-top: 1rem; }

/* ── Top bar ──────────────────────────────────────────────────────────────── */
.arena-topbar {
  position: fixed; top: 0; left: 0; right: 0; height: 48px;
  display: flex; align-items: center; gap: 1rem;
  padding: 0 1.25rem;
  background: var(--panel); border-bottom: 1px solid var(--border);
  z-index: 10;
  box-shadow: var(--shadow);
}
.arena-title { display: flex; flex-direction: column; line-height: 1.1; }
.arena-eyebrow { color: var(--accent); font-size: 0.65rem; letter-spacing: 0.1em; text-transform: uppercase; font-weight: 600; }
.arena-name { font-weight: 600; font-size: 0.95rem; color: var(--text-strong); }
.arena-status {
  display: flex; align-items: center; gap: 0.5rem;
  font-size: 0.78rem; color: var(--muted);
}
.arena-backend {
  margin-left: auto; display: flex; align-items: center; gap: 0.75rem;
  font-size: 0.72rem;
}
.gpu-info {
  color: var(--muted-2); white-space: nowrap; max-width: 22ch;
  overflow: hidden; text-overflow: ellipsis;
}
.backend-toggle {
  display: inline-flex; border: 1px solid var(--border); border-radius: 6px;
  overflow: hidden; background: var(--panel-2);
}
.backend-toggle button {
  background: transparent; color: var(--muted); border: 0;
  padding: 4px 10px; font: inherit; font-size: 0.72rem; cursor: pointer;
  border-right: 1px solid var(--border); transition: background .15s, color .15s;
}
.backend-toggle button:last-child { border-right: 0; }
.backend-toggle button:hover { color: var(--text); }
.backend-toggle button[aria-pressed="true"] {
  background: var(--accent); color: var(--accent-text); cursor: default;
}
.backend-toggle button:disabled { opacity: 0.4; cursor: not-allowed; }
#ai-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--warn); transition: background .2s;
}
#ai-dot.ready  { background: var(--ok); }
#ai-dot.error  { background: var(--err); }
#ai-dot.busy   { background: var(--accent); animation: pulse 1.2s infinite; }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:0.4} }

/* ── Layout ───────────────────────────────────────────────────────────────── */
.arena-layout {
  position: fixed; top: 48px; left: 0; right: 0; bottom: 0;
  display: grid; grid-template-columns: 240px 1fr 380px;
  min-height: 0;
}

/* ── Sidebar (left) ───────────────────────────────────────────────────────── */
.arena-sidebar {
  display: flex; flex-direction: column;
  background: var(--panel); border-right: 1px solid var(--border);
  overflow: hidden;
}
.sidebar-header {
  padding: 1rem 1rem 0.5rem;
  font-size: 0.7rem; color: var(--muted);
  letter-spacing: 0.1em; text-transform: uppercase; font-weight: 600;
}
.sidebar-list { flex: 1; min-height: 0; overflow-y: auto; padding: 0.5rem; }
.sidebar-footer {
  padding: 0.6rem 1rem;
  border-top: 1px solid var(--border-soft);
  display: flex; align-items: center; justify-content: space-between;
  font-size: 0.78rem;
}
.sidebar-back { color: var(--muted); text-decoration: none; }
.sidebar-back:hover { color: var(--text); }

.ex-card {
  display: block; width: 100%; text-align: left;
  background: transparent; border: 1px solid transparent;
  border-radius: 8px; padding: 0.7rem 0.8rem;
  cursor: pointer; font-family: inherit; color: var(--text);
  transition: background .15s, border-color .15s, transform .15s;
  margin-bottom: 0.3rem;
  position: relative;
}
.ex-card:hover { background: var(--panel-2); border-color: var(--border); }
.ex-card--active {
  background: var(--panel-2);
  border-color: var(--ex-accent);
  box-shadow: inset 3px 0 0 var(--ex-accent);
}
.ex-card__head {
  display: flex; align-items: center; gap: 0.5rem;
  font-size: 0.86rem; font-weight: 600; color: var(--text-strong);
  margin-bottom: 0.25rem;
}
.ex-card__icon { font-size: 1rem; }
.ex-card__name { color: var(--text-strong); }
.ex-card__tag {
  font-size: 0.7rem; color: var(--muted); line-height: 1.45;
}

.theme-toggle {
  background: transparent; border: 1px solid var(--border); color: var(--muted);
  width: 28px; height: 28px; border-radius: 6px;
  cursor: pointer; font-family: inherit; font-size: 0.95rem;
  display: flex; align-items: center; justify-content: center;
}
.theme-toggle:hover { color: var(--text); border-color: var(--accent); }

/* ── Workspace (centre) ───────────────────────────────────────────────────── */
.arena-workspace {
  display: flex; flex-direction: column;
  background: var(--bg);
  min-width: 0; min-height: 0;
}

.ex-header {
  display: flex; align-items: center; gap: 0.75rem;
  padding: 0.75rem 1.25rem;
  border-bottom: 1px solid var(--border-soft);
  background: var(--panel);
}
.ex-header .ex-icon {
  font-size: 1.4rem; line-height: 1;
  width: 32px; height: 32px; border-radius: 8px;
  background: var(--accent-soft);
  display: flex; align-items: center; justify-content: center;
}
.ex-header .ex-meta { display: flex; flex-direction: column; }
.ex-header .ex-name { font-size: 0.92rem; font-weight: 600; color: var(--text-strong); }
.ex-header .ex-desc { font-size: 0.74rem; color: var(--muted); margin-top: 1px; }

.ex-presets {
  display: flex; flex-wrap: wrap; gap: 0.4rem;
  padding: 0.6rem 1.25rem;
  border-bottom: 1px solid var(--border-soft);
  background: var(--panel-3);
}
.preset-chip {
  background: var(--panel); border: 1px solid var(--border);
  color: var(--muted); padding: 0.3rem 0.7rem;
  border-radius: 999px; font-family: inherit; font-size: 0.74rem;
  cursor: pointer;
  transition: color .15s, border-color .15s, background .15s, transform .1s;
}
.preset-chip:hover {
  color: var(--text-strong); border-color: var(--accent);
  transform: translateY(-1px);
}
.preset-chip:disabled { opacity: 0.5; cursor: not-allowed; }
.preset-chip--primary {
  background: var(--accent); color: var(--accent-text); border-color: var(--accent);
}
.preset-chip--primary:hover { color: var(--accent-text); filter: brightness(1.1); }

.ex-body {
  flex: 1; min-height: 0; position: relative; overflow: hidden;
  animation: fadein 0.25s ease;
}
@keyframes fadein { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }

.ws-loading {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  color: var(--muted); font-size: 0.8rem;
}

/* ── Workspace variants ───────────────────────────────────────────────────── */
.ws-canvas {
  position: relative; height: 100%;
  background-color: var(--canvas-bg);
  background-image: radial-gradient(circle, var(--canvas-dot) 1px, transparent 1px);
  background-size: 18px 18px;
  overflow: auto;
}
.canvas-empty {
  position: absolute; inset: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  color: var(--muted); pointer-events: none; user-select: none;
  text-align: center; padding: 1rem;
}
.canvas-empty.hidden { display: none; }
.canvas-empty-icon { font-size: 2rem; margin-bottom: 0.5rem; opacity: 0.5; }
.canvas-empty-title { font-size: 0.95rem; color: var(--text); margin-bottom: 0.4rem; }
.canvas-empty-sub { font-size: 0.78rem; max-width: 360px; line-height: 1.55; }

.canvas-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  grid-auto-rows: 60px;
  gap: 12px;
  padding: 16px;
  min-height: 100%;
}
.canvas-slot {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px;
  overflow: hidden;
  position: relative;
  display: flex; flex-direction: column;
  box-shadow: var(--shadow);
  animation: pop-in 0.25s ease;
}
@keyframes pop-in {
  from { opacity: 0; transform: scale(0.96); }
  to   { opacity: 1; transform: scale(1); }
}
.canvas-slot__close {
  position: absolute; top: 6px; right: 6px;
  width: 22px; height: 22px;
  background: transparent; border: none; color: var(--muted);
  cursor: pointer; border-radius: 4px; font-size: 1rem; line-height: 1;
}
.canvas-slot__close:hover { background: var(--border); color: var(--text); }
.canvas-slot__body { flex: 1; min-height: 0; display: flex; flex-direction: column; }
/* render_html mounts arbitrary Tailwind-styled markup; let it use the full slot. */
.canvas-slot__body--html { display: block; overflow: auto; }
.canvas-slot__body--html > * { max-width: 100%; }

/* Fallback notice banner shown above render_html bodies. */
.canvas-slot--html { padding-top: 8px; }
.canvas-slot__notice {
  flex-shrink: 0;
  margin: 0 0 0.6rem;
  padding: 0.35rem 0.6rem;
  font-size: 0.7rem; line-height: 1.4;
  color: var(--warn);
  background: color-mix(in srgb, var(--warn) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--warn) 35%, transparent);
  border-radius: 6px;
  letter-spacing: 0.01em;
}
.canvas-slot__notice::before { content: "ⓘ "; opacity: 0.85; }

.ws-form, .ws-doc, .ws-code {
  height: 100%; padding: 1.25rem; overflow: auto;
  background: var(--bg);
}
.ws-form--with-voice {
  display: flex; flex-direction: column; gap: 1rem;
}
.ws-form--with-voice voice-controls { flex-shrink: 0; }
.ws-form--with-voice sample-form { flex: 1; min-height: 0; }
.ws-code { display: flex; flex-direction: column; }
.ws-code code-sandbox { flex: 1; min-height: 0; }

/* ── Canvas + side-panel (datasets + components) split ────────────────────── */
.ws-canvas-split {
  display: grid;
  grid-template-columns: 1fr 240px;
  height: 100%; min-height: 0;
}
.ws-canvas-split .ws-canvas { height: 100%; }

.ws-side {
  display: grid;
  grid-template-rows: 1fr auto;
  min-height: 0;
  background: var(--panel);
  border-left: 1px solid var(--border);
  overflow: hidden;
}
.ws-side dataset-list { border-left: none; min-height: 0; }
.ws-side component-list { max-height: 40%; min-height: 120px; }

@media (max-width: 1280px) {
  .ws-canvas-split { grid-template-columns: 1fr 200px; }
}
@media (max-width: 1100px) {
  .ws-canvas-split { grid-template-columns: 1fr; }
  .ws-side { display: none; }
}

/* ── Voice example layout ─────────────────────────────────────────────────── */
.ws-voice {
  display: flex; flex-direction: column;
  height: 100%; min-height: 0;
}
.ws-voice voice-controls {
  margin: 0.85rem 1rem 0.6rem;
}
.ws-voice .ws-canvas-split {
  flex: 1; min-height: 0;
}

/* ── Chat (right) ─────────────────────────────────────────────────────────── */
.arena-chat {
  display: flex; flex-direction: column;
  background: var(--panel); border-left: 1px solid var(--border);
  height: 100%; min-height: 0;
}
.chat-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.75rem 1rem; border-bottom: 1px solid var(--border);
  font-size: 0.85rem; color: var(--muted);
}
.chat-header button {
  background: transparent; border: 1px solid var(--border); color: var(--muted);
  padding: 0.2rem 0.5rem; border-radius: 4px; cursor: pointer; font-family: inherit;
}
.chat-header button:hover { color: var(--text); border-color: var(--accent); }
.chat-messages {
  flex: 1; min-height: 0; overflow-y: auto;
  padding: 1rem; display: flex; flex-direction: column; gap: 0.75rem;
}
.chat-msg {
  padding: 0.6rem 0.8rem; border-radius: 8px;
  font-size: 0.82rem; line-height: 1.5;
  word-wrap: break-word; white-space: pre-wrap;
  animation: slide-in 0.18s ease;
}
@keyframes slide-in { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }
.chat-msg--user      { background: var(--accent); color: var(--accent-text); align-self: flex-end; max-width: 90%; }
.chat-msg--assistant { background: var(--panel-2); color: var(--text); align-self: flex-start; max-width: 95%; border: 1px solid var(--border); }
.chat-msg--system    { background: transparent; border: 1px dashed var(--border); color: var(--muted); font-size: 0.75rem; }
.chat-msg--error     { background: var(--err-bg); color: var(--err-text); border: 1px solid var(--err-border); }

.chat-tool {
  border: 1px solid var(--border); border-radius: 6px;
  background: var(--tool-bg); align-self: stretch; font-size: 0.72rem;
  animation: slide-in 0.18s ease;
}
.chat-tool > summary {
  list-style: none; cursor: pointer; padding: 0.45rem 0.7rem;
  color: var(--muted); display: flex; align-items: center; gap: 0.5rem;
}
.chat-tool > summary::-webkit-details-marker { display: none; }
.chat-tool > summary::before { content: "▸"; font-size: 0.7rem; }
.chat-tool[open] > summary::before { content: "▾"; }
.chat-tool .chat-tool__name { color: var(--accent); font-weight: 600; }
.chat-tool .chat-tool__status { margin-left: auto; }
.chat-tool .chat-tool__status--ok  { color: var(--ok); }
.chat-tool .chat-tool__status--err { color: var(--err); }
.chat-tool pre {
  margin: 0; padding: 0.5rem 0.7rem 0.7rem;
  font-size: 0.7rem; color: var(--muted);
  background: var(--input-bg); border-top: 1px solid var(--border);
  overflow-x: auto; white-space: pre-wrap;
}

.chat-input-row {
  display: flex; gap: 0.5rem; padding: 0.75rem; border-top: 1px solid var(--border);
}
#chat-input {
  flex: 1; resize: none;
  background: var(--input-bg); color: var(--text);
  border: 1px solid var(--border); border-radius: 6px;
  padding: 0.5rem 0.7rem; font-family: inherit; font-size: 0.85rem;
  outline: none;
}
#chat-input:focus { border-color: var(--accent); }
#chat-input:disabled { opacity: 0.5; }
#chat-send-btn {
  background: var(--accent); color: var(--accent-text); border: none;
  width: 38px; border-radius: 6px; cursor: pointer; font-size: 1rem;
}
#chat-send-btn:disabled { background: var(--border); color: var(--muted); cursor: not-allowed; }

/* ── Mobile drawer plumbing (hidden on desktop) ───────────────────────────── */
.mobile-toggle {
  display: none;
  background: transparent; border: 1px solid var(--border);
  color: var(--text); width: 34px; height: 34px; border-radius: 6px;
  font-size: 1rem; cursor: pointer; align-items: center; justify-content: center;
  padding: 0; flex-shrink: 0;
}
.mobile-toggle:hover { color: var(--text-strong); border-color: var(--accent); }
.drawer-close {
  display: none;
  background: transparent; border: 0; color: var(--muted);
  font-size: 1.5rem; line-height: 1; cursor: pointer; padding: 4px 10px;
}
.drawer-close:hover { color: var(--text-strong); }
.arena-backdrop {
  display: none;
  position: fixed; inset: 48px 0 0 0; background: rgba(0,0,0,0.55);
  z-index: 15; opacity: 0; transition: opacity .2s;
}
.arena-backdrop.show { display: block; opacity: 1; }
.chat-header-actions { display: flex; align-items: center; gap: 0.25rem; }

/* ── Smaller screens ──────────────────────────────────────────────────────── */
@media (max-width: 1100px) {
  .arena-layout { grid-template-columns: 200px 1fr 320px; }
}

@media (max-width: 768px) {
  /* Topbar — keep one row, drop low-priority labels, shrink toggle. */
  .arena-topbar { gap: 0.5rem; padding: 0 0.6rem; }
  .arena-title  { display: none; }
  .arena-eyebrow { display: none; }
  .arena-status { font-size: 0.7rem; gap: 0.25rem; }
  #ai-status-text { max-width: 12ch; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .arena-backend { gap: 0.4rem; margin-left: auto; }
  .gpu-info { display: none; }
  .backend-toggle button { padding: 4px 8px; font-size: 0.66rem; }
  .mobile-toggle { display: inline-flex; }
  #chat-open-btn { margin-left: 0.25rem; }

  /* Layout — single column, workspace fills the screen. */
  .arena-layout { grid-template-columns: 1fr; }

  /* Sidebar becomes a left drawer. */
  .arena-sidebar {
    position: fixed; top: 48px; left: 0; bottom: 0;
    width: min(85vw, 320px); z-index: 20;
    transform: translateX(-100%); transition: transform .22s ease;
    border-right: 1px solid var(--border);
  }
  .arena-sidebar.open { transform: translateX(0); }

  /* Chat becomes a right drawer. */
  .arena-chat {
    position: fixed; top: 48px; right: 0; bottom: 0;
    width: min(95vw, 420px); z-index: 20;
    transform: translateX(100%); transition: transform .22s ease;
    border-left: 1px solid var(--border);
  }
  .arena-chat.open { transform: translateX(0); }

  /* Show in-drawer close buttons only on mobile. */
  .drawer-close { display: inline-flex; }
  .arena-sidebar .drawer-close {
    position: absolute; top: 6px; right: 8px; z-index: 1;
  }

  /* Workspace tightening. */
  .ex-header   { padding: 0.55rem 0.75rem; gap: 0.5rem; }
  .ex-presets  { padding: 0.5rem 0.75rem; }
  .ex-body     { padding: 0.5rem; }
  .preset-chip { font-size: 0.7rem; padding: 0.25rem 0.55rem; }

  /* Chat input + messages tightening. */
  .chat-messages { padding: 0.6rem; }
  .chat-input-row { padding: 0.6rem; gap: 0.4rem; }
  #chat-input { font-size: 16px; }   /* iOS: ≥16px stops auto-zoom on focus */
}

@media (max-width: 380px) {
  .arena-name { font-size: 0.8rem; }
  .backend-toggle button { padding: 3px 6px; font-size: 0.62rem; }
  #ai-status-text { max-width: 8ch; }
}