:root {
  --bg: #0e1014;
  --panel: #161922;
  --panel-2: #1d2230;
  --border: #2a3142;
  --text: #e6e8ee;
  --muted: #8a93a6;
  --accent: #f0b75a;
  --accent-2: #b48cff;
  --success: #6ee7a0;
  --danger: #ff7676;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 15px;
}

.hidden { display: none !important; }
.muted { color: var(--muted); }
.error { color: var(--danger); }

a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }

/* =========================================================================
   Button system
   ========================================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 9px 16px;
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  transition: background .15s, border-color .15s, color .15s, opacity .15s;
  white-space: nowrap;
}
.btn:focus-visible {
  outline: 2px solid var(--accent-2);
  outline-offset: 2px;
}
.btn:disabled {
  opacity: .45;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--accent);
  color: #1a1306;
}
.btn-primary:hover:not(:disabled) { background: #ffc771; }

.btn-secondary {
  background: transparent;
  color: var(--muted);
  border-color: var(--border);
}
.btn-secondary:hover:not(:disabled) {
  color: var(--text);
  border-color: #3a4358;
}

.btn-link {
  background: none;
  border: none;
  padding: 0;
  color: var(--muted);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
}
.btn-link:hover { color: var(--accent-2); text-decoration: underline; }

/* logo */
.logo { width: 56px; height: 56px; flex: 0 0 56px; }
.logo-lg { width: 96px; height: 96px; flex: 0 0 96px; align-self: center; }

/* login modal */
.modal {
  position: fixed; inset: 0;
  background: radial-gradient(ellipse at center, #1b1f2a 0%, #06070a 75%);
  display: flex; align-items: center; justify-content: center;
  z-index: 50;
}
.login-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px 32px 32px;
  width: 100%; max-width: 380px;
  display: flex; flex-direction: column; gap: 12px;
  align-items: stretch;
  box-shadow: 0 12px 60px rgba(0,0,0,.6);
}
.login-card h1 {
  margin: 0; font-size: 20px; letter-spacing: .02em; text-align: center;
}
.login-card .muted { text-align: center; margin: -4px 0 8px; }
.login-card input {
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 15px;
}

/* =========================================================================
   Layout
   ========================================================================= */
#app {
  display: grid;
  grid-template-columns: 340px 1fr;
  height: 100vh;
}

.sidebar {
  background: var(--panel);
  border-right: 1px solid var(--border);
  padding: 20px 18px 16px;
  display: flex; flex-direction: column; gap: 14px;
  overflow-y: auto;
}
.brand {
  display: flex;
  gap: 12px;
  align-items: center;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}
.brand-text h1 { margin: 0; font-size: 17px; letter-spacing: .02em; }
.brand-text p { margin: 4px 0 0; font-size: 12px; line-height: 1.4; }
.levels {
  list-style: none; padding: 0; margin: 0;
  display: flex; flex-direction: column; gap: 6px;
}
.levels li {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  cursor: pointer;
  display: flex; align-items: flex-start; gap: 10px;
  transition: border-color .15s, background .15s;
}
.levels li:hover { border-color: #3a4358; }
.levels li.active { border-color: var(--accent); background: #221a0e; }
.levels li.locked { opacity: .55; cursor: not-allowed; }
.levels li.won { border-color: var(--success); }
.levels li .badge {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
  width: 22px; flex: 0 0 22px;
  text-align: center;
  padding-top: 1px;
}
.levels li.won .badge { color: var(--success); }
.levels li.locked .badge { color: var(--muted); }
.levels li .title-row { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.levels li strong { font-size: 13px; font-weight: 600; }
.levels li span { font-size: 11px; color: var(--muted); line-height: 1.35; }

.sidebar-footer {
  margin-top: auto;
  padding-top: 14px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 6px;
}
.sidebar-footer .sep { color: var(--border); }

/* =========================================================================
   Main pane / level header
   ========================================================================= */
.main-pane {
  display: grid;
  grid-template-rows: auto 1fr auto;
  height: 100vh;
  overflow: hidden;
}
.level-header {
  padding: 18px 28px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}
.level-header-top {
  display: flex;
  align-items: center;
  gap: 18px;
}
.level-marker {
  font-family: var(--mono);
  font-size: 28px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -.02em;
  white-space: nowrap;
}
.level-marker .level-num-sep {
  color: var(--border);
  margin: 0 2px;
  font-weight: 400;
}
.level-marker #level-total {
  color: var(--muted);
  font-size: 18px;
  font-weight: 500;
}
.level-title-wrap { flex: 1; min-width: 0; }
.level-title-wrap h2 { margin: 0 0 2px; font-size: 19px; letter-spacing: .01em; }
.level-title-wrap p { margin: 0; font-size: 13px; }

.tries-counter {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  white-space: nowrap;
}
.tries-counter #tries-num { color: var(--text); font-weight: 600; }

.level-header .target {
  margin-top: 12px;
  font-size: 14px;
  color: var(--text);
  line-height: 1.45;
}
.level-header .target strong { color: var(--accent); }

/* =========================================================================
   Pipeline diagram
   ========================================================================= */
.pipeline {
  margin-top: 16px;
  display: flex;
  align-items: stretch;
  gap: 0;
  overflow-x: auto;
  padding-bottom: 4px;
}
.pipe-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 8px 10px;
  min-width: 78px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--panel-2);
  transition: border-color .2s, background .2s, color .2s, box-shadow .2s;
  position: relative;
}
.pipe-node.anchor {
  border-color: var(--accent-2);
  background: rgba(180,140,255,.08);
  color: var(--accent-2);
}
.pipe-node.anchor .pipe-icon { color: var(--accent-2); }
.pipe-node.guard.on {
  border-color: var(--accent);
  background: rgba(240,183,90,.10);
  color: var(--accent);
  box-shadow: 0 0 0 1px rgba(240,183,90,.2);
}
.pipe-node.guard.off {
  opacity: .45;
}
.pipe-node .pipe-icon {
  font-size: 16px;
  line-height: 1;
  color: var(--muted);
}
.pipe-node.guard.on .pipe-icon { color: var(--accent); }
.pipe-node .pipe-label {
  font-family: var(--mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: .06em;
  line-height: 1.2;
  text-align: center;
  color: var(--muted);
}
.pipe-node.anchor .pipe-label { color: var(--accent-2); }
.pipe-node.guard.on .pipe-label { color: var(--accent); }
.pipe-node .pipe-state {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: .1em;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 1px 4px;
  margin-top: 2px;
}
.pipe-node.guard.on .pipe-state {
  color: var(--accent);
  border-color: var(--accent);
}

.pipe-arrow {
  flex: 0 0 24px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--border);
}
.pipe-arrow::after {
  content: "→";
  font-size: 18px;
  line-height: 1;
}
.pipe-arrow.lit { color: var(--accent); }

@keyframes pulseRed {
  0%   { box-shadow: 0 0 0 0 rgba(255,118,118,0); }
  20%  { box-shadow: 0 0 0 6px rgba(255,118,118,.45), inset 0 0 0 1px var(--danger); }
  100% { box-shadow: 0 0 0 0 rgba(255,118,118,0); }
}
.pipe-node.pulse {
  animation: pulseRed .8s ease-out;
}

/* =========================================================================
   Defense note (collapsible)
   ========================================================================= */
details.defense-note {
  margin-top: 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel-2);
  font-size: 13px;
}
details.defense-note summary {
  cursor: pointer;
  padding: 10px 14px;
  color: var(--accent-2);
  font-weight: 600;
  list-style: none;
  user-select: none;
  display: flex;
  align-items: center;
  gap: 6px;
}
details.defense-note summary::-webkit-details-marker { display: none; }
details.defense-note summary::before {
  content: "▸";
  display: inline-block;
  transition: transform .15s;
}
details.defense-note[open] summary::before { transform: rotate(90deg); }
details.defense-note #defense-note {
  padding: 0 14px 12px;
  color: var(--text);
  line-height: 1.55;
  white-space: pre-wrap;
}

/* =========================================================================
   Chat + bubbles + block strips
   ========================================================================= */
.chat {
  padding: 24px 28px;
  overflow-y: auto;
  display: flex; flex-direction: column; gap: 12px;
}
.bubble {
  max-width: 720px;
  padding: 12px 14px;
  border-radius: 10px;
  line-height: 1.45;
  white-space: pre-wrap;
  word-wrap: break-word;
}
.bubble.user {
  align-self: flex-end;
  background: #25304a;
  border: 1px solid #2f3c5c;
}
.bubble.assistant {
  align-self: flex-start;
  background: var(--panel-2);
  border: 1px solid var(--border);
}
.bubble.assistant.redacted {
  border-color: var(--danger);
  background: rgba(255,118,118,.06);
  position: relative;
}
.bubble.assistant.redacted::after {
  content: "redacted by output filter";
  position: absolute;
  top: 6px; right: 10px;
  font-size: 10px;
  font-family: var(--mono);
  color: var(--danger);
  letter-spacing: .04em;
  text-transform: uppercase;
}
.bubble .label {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted);
  margin-bottom: 4px;
  letter-spacing: .04em;
  text-transform: uppercase;
}

.block-strip {
  align-self: flex-start;
  max-width: 720px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 8px;
  background: rgba(255,118,118,.06);
  border: 1px solid var(--danger);
  color: var(--danger);
  font-size: 13px;
  line-height: 1.4;
}
.block-strip .block-icon {
  font-size: 16px;
  line-height: 1;
  flex: 0 0 auto;
}
.block-strip .block-stage {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .04em;
  text-transform: uppercase;
  font-weight: 600;
  margin-right: 4px;
}
.block-strip .block-reason { color: var(--text); }

/* =========================================================================
   Composer
   ========================================================================= */
.composer {
  border-top: 1px solid var(--border);
  background: var(--panel);
  padding: 14px 28px 18px;
  display: flex; flex-direction: column; gap: 10px;
}
.composer textarea {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 12px;
  font-family: inherit;
  font-size: 14px;
  resize: vertical;
  min-height: 70px;
}
.composer textarea:focus {
  outline: none;
  border-color: var(--accent);
}
.composer-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}
.composer-row-left {
  display: flex;
  gap: 8px;
}

.hint-strip {
  border: 1px dashed var(--accent-2);
  background: rgba(180,140,255,.06);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--text);
}
.hint-strip strong {
  color: var(--accent-2);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .06em;
  text-transform: uppercase;
  margin-right: 6px;
}

/* =========================================================================
   Win toast (centered, animated)
   ========================================================================= */
.win-toast {
  position: fixed;
  top: 28px;
  left: 50%;
  transform: translateX(-50%) translateY(-12px);
  background: linear-gradient(180deg, #163d2a, #0f2d20);
  border: 1px solid var(--success);
  border-radius: 12px;
  padding: 14px 18px;
  display: flex;
  align-items: center;
  gap: 14px;
  box-shadow: 0 14px 50px rgba(0,0,0,.55), 0 0 0 1px rgba(110,231,160,.15);
  z-index: 60;
  opacity: 0;
  transition: opacity .25s ease, transform .25s ease;
  pointer-events: none;
}
.win-toast:not(.hidden) {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}
.win-toast-icon {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: var(--success);
  color: #062417;
  font-weight: 800;
  font-size: 18px;
  display: flex; align-items: center; justify-content: center;
}
.win-toast-body { display: flex; flex-direction: column; gap: 2px; }
.win-toast-body strong { color: var(--success); font-size: 15px; }
.win-toast-body #win-detail { color: var(--text); font-size: 13px; }

/* =========================================================================
   Responsive
   ========================================================================= */
@media (max-width: 800px) {
  #app { grid-template-columns: 1fr; grid-template-rows: auto 1fr; }
  .sidebar { border-right: none; border-bottom: 1px solid var(--border); max-height: 40vh; }
  .main-pane { height: auto; }
  .level-header-top { flex-wrap: wrap; }
  .pipeline { padding-bottom: 8px; }
  .pipe-node { min-width: 70px; padding: 6px 8px; }
}