* { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #f7f6f3;
  --panel: #ffffff;
  --ink: #1f2430;
  --ink-soft: #5b6270;
  --line: #e6e2da;
  --accent: #4f46e5;
  --accent-soft: #eef2ff;
  --code-bg: #1e2430;
  --code-ink: #e8ecf4;
  --radius: 14px;
  font-size: 16px;
}

body {
  font-family: "Avenir Next", "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.65;
}

.layout { display: flex; min-height: 100vh; }

/* ── Sidebar ─────────────────────────────────────────── */
.sidebar {
  width: 300px;
  flex-shrink: 0;
  background: var(--panel);
  border-right: 1px solid var(--line);
  padding: 28px 20px;
  display: flex;
  flex-direction: column;
  gap: 24px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}

.brand-title { font-size: 1.35rem; font-weight: 700; letter-spacing: -0.02em; }
.brand-tagline { font-size: 0.82rem; color: var(--ink-soft); margin-top: 6px; }

.lesson-nav { display: flex; flex-direction: column; gap: 6px; flex: 1; }

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid transparent;
  background: none;
  text-align: left;
  font: inherit;
  cursor: pointer;
  color: var(--ink);
  width: 100%;
}
.nav-item:hover { background: var(--accent-soft); }
.nav-item.active { background: var(--accent-soft); border-color: #c7d2fe; }
.nav-item.locked { cursor: default; opacity: 0.45; }
.nav-item.locked:hover { background: none; }

.nav-num {
  width: 30px; height: 30px;
  flex-shrink: 0;
  border-radius: 50%;
  display: grid; place-items: center;
  font-size: 0.85rem; font-weight: 700;
  background: var(--accent); color: #fff;
}
.nav-item.locked .nav-num { background: #cfd3dc; color: #fff; }
.nav-text { min-width: 0; }
.nav-title { font-weight: 600; font-size: 0.95rem; }
.nav-sub { font-size: 0.78rem; color: var(--ink-soft); }
.nav-badge {
  margin-left: auto;
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-soft);
  flex-shrink: 0;
}

.sidebar-footer { font-size: 0.75rem; color: var(--ink-soft); }
.sidebar-footer .footer-link { color: var(--ink-soft); text-decoration: underline; }
.sidebar-footer .footer-link:hover { color: var(--accent); }

/* ── Content ─────────────────────────────────────────── */
.content { flex: 1; padding: 48px clamp(24px, 6vw, 96px); max-width: 980px; }
.loading { color: var(--ink-soft); padding: 40px 0; }

.stage-kicker {
  color: var(--accent);
  font-weight: 700;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}
h1 { font-size: 2.3rem; letter-spacing: -0.03em; margin: 6px 0 4px; }
.lesson-subtitle { font-size: 1.15rem; color: var(--ink-soft); margin-bottom: 20px; }
.lesson-intro {
  font-size: 1.08rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius);
  padding: 18px 22px;
  margin-bottom: 36px;
}

section.lesson-section { margin-bottom: 36px; }
section.lesson-section h2 { font-size: 1.45rem; letter-spacing: -0.02em; margin-bottom: 10px; }
section.lesson-section p { margin-bottom: 12px; }
section.lesson-section a { color: var(--accent); font-weight: 600; }
section.lesson-section ul { margin: 0 0 12px 22px; }
section.lesson-section li { margin-bottom: 6px; }

code {
  font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  font-size: 0.88em;
  background: #edeae3;
  padding: 1px 5px;
  border-radius: 5px;
}

/* ── Code block ──────────────────────────────────────── */
.code-card { border-radius: var(--radius); overflow: hidden; border: 1px solid #2c3444; margin-top: 8px; }
.code-details { margin-bottom: 36px; }
.code-details > summary {
  cursor: pointer;
  font-weight: 700;
  font-size: 1.45rem;
  letter-spacing: -0.02em;
}
.code-details > summary:hover { color: var(--accent); }
.code-details[open] > summary { margin-bottom: 10px; }
.code-details > .lesson-section { margin-bottom: 0; }
.code-header {
  display: flex; align-items: center; gap: 8px;
  background: #171c26;
  color: #97a1b3;
  font-family: ui-monospace, monospace;
  font-size: 0.8rem;
  padding: 10px 16px;
}
.code-dot { width: 10px; height: 10px; border-radius: 50%; }
.code-download {
  margin-left: auto;
  font: inherit;
  font-size: 0.75rem;
  color: #97a1b3;
  background: none;
  border: 1px solid #2c3444;
  border-radius: 6px;
  padding: 3px 10px;
  cursor: pointer;
}
.code-download:hover { color: #fff; border-color: #97a1b3; }
pre.code {
  background: var(--code-bg);
  color: var(--code-ink);
  padding: 18px 20px;
  overflow-x: auto;
  font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  font-size: 0.85rem;
  line-height: 1.6;
}
pre.code code { background: none; padding: 0; font-size: inherit; }
.tok-kw { color: #c792ea; }
.tok-str { color: #a5d6a7; }
.tok-com { color: #6b7688; font-style: italic; }
.tok-num { color: #f2c078; }
.tok-fn { color: #82aaff; }

/* ── Playground ──────────────────────────────────────── */
.playground {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 28px;
  margin: 44px 0 60px;
  box-shadow: 0 8px 30px rgba(31, 36, 48, 0.06);
}
.playground h2 { font-size: 1.45rem; margin-bottom: 6px; }
.playground > p { color: var(--ink-soft); margin-bottom: 18px; }

.param-label { display: block; font-weight: 600; font-size: 0.9rem; margin-bottom: 6px; }
.param-select {
  width: 100%;
  font: inherit;
  padding: 10px 14px;
  border-radius: 10px;
  border: 1.5px solid var(--line);
  background: var(--bg);
  margin-bottom: 14px;
  cursor: pointer;
}
.param-select:focus { outline: none; border-color: var(--accent); }

.slider-value {
  display: inline-block;
  min-width: 28px;
  text-align: center;
  font-weight: 700;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 6px;
  padding: 0 6px;
}
.param-range {
  width: 100%;
  margin: 4px 0 16px;
  accent-color: var(--accent);
}

.raw-io { margin: 8px 0 12px; }
.raw-io summary {
  cursor: pointer;
  font-size: 0.82rem;
  color: var(--ink-soft);
}
.raw-io summary:hover { color: var(--accent); }
.raw-io .chat-template-box { margin-top: 8px; }

.cache-note {
  font-size: 0.82rem;
  color: var(--ink-soft);
  background: var(--accent-soft);
  border-radius: 8px;
  padding: 6px 12px;
  margin: 14px 0 4px;
}

.run-btn {
  font: inherit;
  font-weight: 700;
  font-size: 1rem;
  color: #fff;
  background: var(--accent);
  border: none;
  border-radius: 10px;
  padding: 12px 28px;
  cursor: pointer;
}
.run-btn:hover { background: #4338ca; }
.run-btn:disabled { background: #a5b4fc; cursor: wait; }

.run-error {
  margin-top: 14px;
  color: #b3261e;
  background: #fdecea;
  border: 1px solid #f5c6c1;
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 0.9rem;
}

/* ── Results ─────────────────────────────────────────── */
.results { margin-top: 26px; }
.stats-row { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 20px; }
.stat {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 20px;
  min-width: 120px;
}
.stat-value { font-size: 1.5rem; font-weight: 700; letter-spacing: -0.02em; }
.stat-label { font-size: 0.78rem; color: var(--ink-soft); text-transform: uppercase; letter-spacing: 0.06em; }
.stat.highlight { border-color: #c7d2fe; background: var(--accent-soft); }
.stat.highlight .stat-value { color: var(--accent); }

.results h3 { font-size: 1.05rem; margin-bottom: 10px; }
.result-hint { font-size: 0.85rem; color: var(--ink-soft); font-weight: 400; }

.token-strip { display: flex; flex-wrap: wrap; gap: 4px; row-gap: 8px; margin-bottom: 22px; }
.token-chip {
  position: relative;
  font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  font-size: 0.95rem;
  padding: 5px 8px;
  border-radius: 7px;
  white-space: pre;
  cursor: default;
  border: 1px solid rgba(31, 36, 48, 0.12);
}
.token-chip:hover { outline: 2px solid var(--accent); }
.token-chip .tip {
  display: none;
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--ink);
  color: #fff;
  font-size: 0.72rem;
  padding: 3px 9px;
  border-radius: 6px;
  white-space: nowrap;
  z-index: 5;
}
.token-chip:hover .tip { display: block; }

.id-strip {
  font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  font-size: 0.9rem;
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  row-gap: 8px;
}
.id-chip { padding: 5px 8px; border-radius: 7px; border: 1px solid rgba(31, 36, 48, 0.12); }

.vector-rows { display: flex; flex-direction: column; gap: 6px; overflow-x: auto; padding-bottom: 4px; }
.vector-row { display: flex; align-items: center; gap: 12px; }
.vector-row .token-chip { flex-shrink: 0; }
.vector-values {
  font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  font-size: 0.82rem;
  color: var(--ink-soft);
  white-space: nowrap;
}
.vector-pending {
  background: var(--bg);
  border: 1px dashed var(--line);
  border-radius: 10px;
  padding: 12px 16px;
  font-size: 0.9rem;
  color: var(--ink-soft);
}

/* ── Generation loop results (Stufe 2) ───────────────── */
.gen-answer {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px 20px;
  font-size: 1.1rem;
  margin-bottom: 20px;
  white-space: pre-wrap;
}
.gen-prompt { color: var(--ink-soft); }
.gen-text {
  color: var(--accent);
  font-weight: 600;
  background: var(--accent-soft);
  border-radius: 6px;
  padding: 1px 4px;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
}

.step-list { display: flex; flex-direction: column; gap: 14px; }
.step-card {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px 18px;
}
.step-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}
.step-num {
  font-weight: 700;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
}
.step-chosen { font-size: 0.85rem; color: var(--ink-soft); }
.chosen-chip { background: var(--accent-soft); border-color: #c7d2fe; }

.cand-list { display: flex; flex-direction: column; gap: 5px; }
.cand-row {
  display: grid;
  grid-template-columns: minmax(90px, 150px) 1fr 64px 76px;
  align-items: center;
  gap: 10px;
  padding: 3px 8px;
  border-radius: 8px;
}
.cand-row.chosen { background: var(--accent-soft); outline: 1px solid #c7d2fe; }
.cand-token {
  font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  font-size: 0.88rem;
  white-space: pre;
  overflow: hidden;
  text-overflow: ellipsis;
}
.cand-bar {
  height: 10px;
  border-radius: 999px;
  background: rgba(31, 36, 48, 0.08);
  overflow: hidden;
}
.cand-fill {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: var(--accent);
  opacity: 0.75;
}
.cand-row.chosen .cand-fill { opacity: 1; }
.cand-prob {
  font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  font-size: 0.82rem;
  text-align: right;
  white-space: nowrap;
}
.cand-pick {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent);
  white-space: nowrap;
}

@media (max-width: 640px) {
  .cand-row { grid-template-columns: minmax(70px, 110px) 1fr 56px; }
  .cand-pick { display: none; }
}

/* ── Chat template results (Stufe 4) ─────────────────── */
.chat-template-box {
  background: var(--code-bg);
  color: var(--code-ink);
  border-radius: 12px;
  padding: 16px 20px;
  font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  font-size: 0.88rem;
  line-height: 1.9;
  white-space: pre-wrap;
  word-break: break-word;
  margin-bottom: 8px;
}
.special-chip {
  background: #4f46e5;
  color: #fff;
  border-radius: 6px;
  padding: 2px 6px;
  margin: 0 1px;
  font-weight: 600;
  white-space: nowrap;
}
.think-box {
  background: var(--bg);
  border: 1px dashed var(--line);
  border-left: 4px solid #cfd3dc;
  border-radius: 10px;
  padding: 12px 16px;
  font-size: 0.9rem;
  font-style: italic;
  color: var(--ink-soft);
  white-space: pre-wrap;
  margin-bottom: 20px;
}

/* ── Tool calling results (Stufe 5) ──────────────────── */
.round-label {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  margin-bottom: 6px;
}
.round-reply {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 0.95rem;
  white-space: pre-wrap;
  word-break: break-word;
}
.tool-chip {
  background: #fef3c7;
  border: 1px solid #f2c078;
  border-radius: 6px;
  padding: 1px 6px;
  font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  font-size: 0.85em;
  white-space: pre-wrap;
}
.tool-exec {
  margin-top: 10px;
  background: #fffbeb;
  border: 1px solid #f2c078;
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 0.9rem;
}
.tool-exec code { background: #fef3c7; }

/* ── KV cache race (Stufe 6) ─────────────────────────── */
.timeline-row { margin-bottom: 16px; }
.timeline-label { font-size: 0.85rem; color: var(--ink-soft); margin-bottom: 6px; }
.timeline-bars {
  display: flex;
  align-items: flex-end;
  gap: 3px;
  height: 72px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 8px 10px;
}
.tl-col {
  position: relative;
  flex: 1;
  max-width: 26px;
  height: 100%;
  display: flex;
  align-items: flex-end;
}
.tl-bar { width: 100%; border-radius: 3px 3px 0 0; }
.tl-naive { background: #ef8354; }
.tl-cached { background: var(--accent); opacity: 0.85; }
.tl-col:hover .tl-bar { filter: brightness(0.8); }
.tl-col .tip {
  display: none;
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--ink);
  color: #fff;
  font-size: 0.72rem;
  padding: 3px 9px;
  border-radius: 6px;
  white-space: nowrap;
  z-index: 5;
}
.tl-col:hover .tip { display: block; }

.param-check-label { display: flex; align-items: center; gap: 8px; margin: 2px 0 14px; cursor: pointer; }
.param-check { width: 18px; height: 18px; accent-color: var(--accent); cursor: pointer; flex-shrink: 0; }

.run-history { display: flex; flex-direction: column; gap: 8px; }
.run-history-row {
  display: flex;
  align-items: baseline;
  gap: 12px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 14px;
}
.run-history-label {
  flex-shrink: 0;
  font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  font-size: 0.72rem;
  color: var(--ink-soft);
  background: #edeae3;
  border-radius: 6px;
  padding: 2px 8px;
  white-space: nowrap;
}
.run-history-text { font-size: 0.95rem; white-space: pre-wrap; }

.arrow-note {
  text-align: center;
  color: var(--ink-soft);
  font-size: 0.9rem;
  margin: 4px 0 18px;
}

/* ── Warmup banner ───────────────────────────────────── */
.warmup-banner {
  position: fixed;
  left: 50%;
  bottom: 20px;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: min(92vw, 720px);
  background: var(--ink);
  color: #fff;
  border-radius: 999px;
  padding: 10px 20px;
  font-size: 0.88rem;
  box-shadow: 0 10px 30px rgba(31, 36, 48, 0.35);
  z-index: 50;
}
.warmup-banner.done { background: #14804a; }
.warmup-banner.error { background: #8f1f1f; }
.warmup-text { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.warmup-percent { font-weight: 700; flex-shrink: 0; }
.warmup-spinner {
  width: 14px; height: 14px;
  flex-shrink: 0;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
  animation: warmup-spin 0.9s linear infinite;
}
@keyframes warmup-spin { to { transform: rotate(360deg); } }
.warmup-track {
  width: 140px;
  height: 6px;
  flex-shrink: 0;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.25);
  overflow: hidden;
}
.warmup-fill {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: #fff;
  transition: width 0.6s ease;
}
.warmup-fill.indeterminate {
  width: 40%;
  animation: warmup-slide 1.4s ease-in-out infinite;
}
@keyframes warmup-slide {
  0% { margin-left: -40%; }
  100% { margin-left: 100%; }
}

@media (max-width: 800px) {
  .layout { flex-direction: column; }
  .sidebar { width: 100%; height: auto; position: static; }
  .content { padding: 28px 18px; }
}