/* JavaSber stand — strict, minimalist, authorial */
:root {
  --bg:        #0c0c0e;
  --bg-2:      #111114;
  --line:      #1f2025;
  --line-2:    #2b2c33;
  --fg:        #e9e9ec;
  --fg-dim:    #8a8a93;
  --fg-faint:  #4b4c54;
  --accent:    #ff5b1f;
  --accent-2:  #ffd47a;
  --ok:        #6ee7b7;
  --err:       #ff6b6b;
  --mono:      "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans:      "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--fg); font-family: var(--sans); }
body {
  min-height: 100vh;
  font-feature-settings: "ss01","ss02","cv11";
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ────────────── background grid */
.grid-bg {
  position: fixed; inset: 0;
  background:
    linear-gradient(to right, var(--line) 1px, transparent 1px) 0 0 / 80px 80px,
    linear-gradient(to bottom, var(--line) 1px, transparent 1px) 0 0 / 80px 80px,
    radial-gradient(circle at 20% 0%, rgba(255,91,31,0.07), transparent 50%),
    radial-gradient(circle at 80% 100%, rgba(255,212,122,0.04), transparent 50%);
  z-index: -1;
  mask-image: linear-gradient(to bottom, black 0%, black 70%, transparent 100%);
}

/* ────────────── topbar */
.topbar {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 32px;
  background: rgba(12,12,14,0.78);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.02em;
}
.brand { display: flex; align-items: baseline; gap: 8px; }
.brand__mark  { color: var(--accent); font-weight: 800; }
.brand__name  { font-weight: 700; }
.brand__div   { color: var(--fg-faint); }
.brand__sub   { color: var(--fg-dim); }
.topbar__meta { display: flex; align-items: center; gap: 10px; color: var(--fg-dim); }
.topbar__sep  { color: var(--fg-faint); }
.author       { color: var(--fg-dim); }
.dot {
  width: 8px; height: 8px; border-radius: 999px; background: var(--fg-dim);
  box-shadow: 0 0 0 0 rgba(255,255,255,0); transition: background .2s ease;
}
.dot[data-state="idle"]   { background: var(--fg-dim); }
.dot[data-state="loading"]{ background: var(--accent-2); animation: pulse 1s ease-in-out infinite; }
.dot[data-state="ok"]     { background: var(--ok); }
.dot[data-state="err"]    { background: var(--err); }
@keyframes pulse {
  0%,100% { box-shadow: 0 0 0 0 rgba(255,212,122,0.4); }
  50%     { box-shadow: 0 0 0 6px rgba(255,212,122,0); }
}

/* ────────────── page */
.page { max-width: 1280px; margin: 0 auto; padding: 64px 32px 96px; }

/* ────────────── hero */
.hero { display: grid; grid-template-columns: 1fr; gap: 28px; padding: 28px 0 88px; }
.hero__num {
  font-family: var(--mono);
  font-size: 14px; letter-spacing: 0.06em;
  color: var(--fg-faint);
}
.hero__num [data-counter] { color: var(--accent); }
.hero__title {
  font-family: var(--sans);
  font-weight: 800;
  font-size: clamp(48px, 9vw, 128px);
  line-height: 0.94;
  letter-spacing: -0.03em;
  margin: 0;
}
.hero__title .accent {
  color: var(--accent);
  font-style: italic;
  font-weight: 700;
}
.hero__lead {
  max-width: 56ch;
  color: var(--fg-dim);
  font-size: 18px;
  line-height: 1.55;
  margin: 0;
}
.hero__lead em { color: var(--fg); font-style: normal; border-bottom: 1px dashed var(--accent); padding-bottom: 1px; }
.hero__row { display: flex; align-items: center; gap: 12px; color: var(--fg-dim); font-family: var(--mono); font-size: 13px; }
.hero__hint { letter-spacing: 0.06em; }
kbd {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 28px; height: 28px; padding: 0 6px;
  border: 1px solid var(--line-2);
  border-radius: 4px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg);
  background: var(--bg-2);
  animation: bob 2.2s ease-in-out infinite;
}
@keyframes bob { 0%,100% { transform: translateY(0); } 50% { transform: translateY(3px); } }

/* ────────────── labs */
.labs { display: flex; flex-direction: column; gap: 12px; }
.lab {
  border: 1px solid var(--line);
  background: var(--bg-2);
  overflow: hidden;
  transition: border-color .25s ease, background .25s ease, transform .25s ease;
}
.lab:hover { border-color: var(--line-2); }
.lab__head {
  display: grid;
  grid-template-columns: 80px 1fr auto auto auto;
  align-items: center;
  gap: 16px;
  padding: 24px 28px;
  cursor: pointer;
  user-select: none;
}
.lab__num {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--accent);
  letter-spacing: 0.08em;
}
.lab__title {
  font-size: 24px; font-weight: 600; letter-spacing: -0.01em; margin: 0;
}
.lab__sub {
  display: block; margin-top: 2px;
  font-size: 13px; color: var(--fg-dim); font-weight: 400; letter-spacing: 0;
}
.lab__count {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg-dim);
  padding: 4px 10px;
  border: 1px solid var(--line-2);
  border-radius: 999px;
}
.lab__caret {
  width: 28px; height: 28px;
  display: inline-flex; align-items: center; justify-content: center;
  color: var(--fg-dim);
  transition: transform .35s cubic-bezier(.2,.7,.2,1), color .25s ease;
  font-family: var(--mono);
}
.lab.open .lab__caret { transform: rotate(90deg); color: var(--accent); }

.lab__body {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows .4s cubic-bezier(.2,.7,.2,1);
}
.lab.open .lab__body { grid-template-rows: 1fr; }
.lab__inner {
  overflow: hidden;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
.col {
  padding: 24px 28px;
  border-right: 1px solid var(--line);
}
.col:last-child { border-right: none; }
.col__head {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--fg-dim);
  text-transform: uppercase;
  margin-bottom: 14px;
}
.col__empty { color: var(--fg-faint); font-size: 13px; font-style: italic; }
.col__list { display: flex; flex-direction: column; gap: 2px; }
.task {
  display: grid;
  grid-template-columns: 28px 1fr 16px;
  align-items: center;
  gap: 10px;
  padding: 10px 8px;
  cursor: pointer;
  border-left: 2px solid transparent;
  transition: background .15s ease, border-color .15s ease, padding .15s ease;
}
.task:hover {
  background: rgba(255,91,31,0.04);
  border-left-color: var(--accent);
  padding-left: 12px;
}
.task__num  { font-family: var(--mono); font-size: 12px; color: var(--fg-faint); }
.task__name { font-size: 14px; color: var(--fg); }
.task__arr  { color: var(--fg-faint); font-family: var(--mono); transition: transform .15s ease, color .15s ease; }
.task:hover .task__arr { color: var(--accent); transform: translateX(3px); }

/* ────────────── section headers */
.section-head {
  display: grid;
  grid-template-columns: 80px 1fr auto;
  align-items: baseline;
  gap: 16px;
  margin: 0 0 22px;
  padding: 0 4px;
}
.section-head__num {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--accent);
  letter-spacing: 0.08em;
}
.section-head__title {
  font-size: 22px; font-weight: 700; letter-spacing: -0.01em; margin: 0;
}
.section-head__sub {
  display: block; margin-top: 2px;
  font-size: 13px; color: var(--fg-dim); font-weight: 400; letter-spacing: 0;
}
.section-head__badge {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 999px;
  padding: 5px 12px;
  background: rgba(255,91,31,0.07);
  white-space: nowrap;
}

/* ────────────── exam */
.exam { margin: 0 0 64px; }
.exam__group { margin-bottom: 32px; }
.exam__group:last-child { margin-bottom: 0; }
.exam__grouphead {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin: 0 0 14px 4px;
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--line-2);
}
.exam__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}
.topic {
  appearance: none;
  text-align: left;
  cursor: pointer;
  display: grid;
  grid-template-columns: 56px 1fr 20px;
  align-items: center;
  gap: 14px;
  padding: 22px 24px;
  border: 1px solid var(--line);
  background: var(--bg-2);
  color: var(--fg);
  border-left: 2px solid transparent;
  transition: border-color .2s ease, background .2s ease, transform .2s ease;
  animation: slidein .5s cubic-bezier(.2,.7,.2,1) backwards;
  animation-delay: calc(var(--i) * 0.05s);
}
.topic:hover {
  border-color: var(--line-2);
  border-left-color: var(--accent);
  background: rgba(255,91,31,0.04);
  transform: translateY(-2px);
}
.topic__num {
  font-family: var(--mono);
  font-size: 26px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: -0.02em;
}
.topic__body { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.topic__title { font-size: 16px; font-weight: 600; letter-spacing: -0.01em; }
.topic__sub {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg-dim);
  line-height: 1.4;
}
.topic__arr {
  color: var(--fg-faint);
  font-family: var(--mono);
  transition: transform .2s ease, color .2s ease;
}
.topic:hover .topic__arr { color: var(--accent); transform: translateX(3px); }

.labs-section { margin-top: 8px; }

/* ────────────── footer */
.footer {
  margin-top: 96px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  display: flex; justify-content: space-between;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg-faint);
  letter-spacing: 0.08em;
}

/* ────────────── drawer (run dialog) */
.drawer {
  position: fixed; top: 0; right: 0; height: 100vh; width: min(640px, 100%);
  background: var(--bg-2);
  border-left: 1px solid var(--line-2);
  padding: 32px 32px 40px;
  transform: translateX(100%);
  transition: transform .35s cubic-bezier(.2,.7,.2,1);
  z-index: 100;
  display: flex; flex-direction: column;
  overflow-y: auto;
}
.drawer.open { transform: translateX(0); }
.drawer__head { display: flex; justify-content: space-between; align-items: center; }
.drawer__crumb {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--fg-dim);
}
.drawer__sep  { color: var(--fg-faint); margin: 0 6px; }
.drawer__close {
  appearance: none; background: transparent;
  border: 1px solid var(--line-2);
  color: var(--fg-dim);
  width: 32px; height: 32px; cursor: pointer; font-size: 14px;
  transition: color .2s, border-color .2s, transform .2s;
}
.drawer__close:hover { color: var(--accent); border-color: var(--accent); transform: rotate(90deg); }
.drawer__title {
  margin: 18px 0 8px 0;
  font-size: 32px; font-weight: 700; letter-spacing: -0.02em;
}
.drawer__desc { color: var(--fg-dim); font-size: 14px; margin: 0 0 12px 0; }
.drawer__id { font-family: var(--mono); font-size: 12px; color: var(--fg-faint); margin-bottom: 24px; }
.drawer__id code { color: var(--fg-dim); }

.drawer__lbl {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--fg-dim);
  text-transform: uppercase;
  margin-bottom: 8px;
  display: block;
}
.drawer__lbl-opt { color: var(--fg-faint); text-transform: none; letter-spacing: 0; }

/* hint block */
.hint {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 12px;
  margin-bottom: 8px;
  background: rgba(255,212,122,0.06);
  border-left: 2px solid var(--accent-2);
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.55;
  color: var(--fg);
  white-space: pre-wrap;
}
.hint--none {
  background: rgba(255,255,255,0.025);
  border-left-color: var(--line-2);
  color: var(--fg-dim);
}
.hint__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px; height: 18px;
  border: 1px solid var(--accent-2);
  border-radius: 999px;
  font-family: var(--sans);
  font-weight: 700;
  font-size: 11px;
  color: var(--accent-2);
  flex-shrink: 0;
  margin-top: 1px;
}
.hint--none .hint__icon {
  border-color: var(--fg-faint);
  color: var(--fg-faint);
}
.hint__text { flex: 1; }

textarea#d-stdin {
  width: 100%;
  min-height: 96px;
  background: var(--bg);
  border: 1px solid var(--line-2);
  color: var(--fg);
  font-family: var(--mono);
  font-size: 13px;
  padding: 12px 14px;
  resize: vertical;
  outline: none;
  transition: border-color .2s ease;
}
textarea#d-stdin:focus { border-color: var(--accent); }

.drawer__actions { display: flex; gap: 10px; margin-top: 16px; }
.btn {
  appearance: none; cursor: pointer; border-radius: 0;
  font-family: var(--mono); font-size: 13px; letter-spacing: 0.08em;
  padding: 12px 18px;
  border: 1px solid var(--line-2);
  background: var(--bg);
  color: var(--fg);
  display: inline-flex; align-items: center; gap: 8px;
  transition: background .2s, border-color .2s, color .2s;
}
.btn--accent {
  border-color: var(--accent);
  color: var(--accent);
}
.btn--accent:hover {
  background: var(--accent);
  color: #0c0c0e;
}
.btn--accent:hover .btn__caret { transform: translateX(4px); }
.btn__caret { transition: transform .2s ease; }
.btn--ghost:hover { color: var(--fg); border-color: var(--fg-dim); }
.btn[disabled] { opacity: 0.45; pointer-events: none; }

.output {
  margin-top: 28px;
  border: 1px solid var(--line-2);
  background: var(--bg);
  flex: 1;
  display: flex; flex-direction: column;
  min-height: 220px;
}
.output__bar {
  display: flex; justify-content: space-between;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line-2);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.output__lbl  { color: var(--fg-dim); }
.output__meta { color: var(--fg-faint); text-transform: none; letter-spacing: 0; }
.output__meta[data-state="ok"]  { color: var(--ok); }
.output__meta[data-state="err"] { color: var(--err); }

pre#d-out {
  margin: 0;
  padding: 16px;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.55;
  color: var(--fg);
  white-space: pre-wrap;
  word-break: break-word;
  overflow-y: auto;
  flex: 1;
}
pre#d-out .placeholder { color: var(--fg-faint); font-style: italic; }

/* scrim */
.scrim {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.5);
  opacity: 0; pointer-events: none;
  transition: opacity .25s ease;
  z-index: 90;
}
.scrim.show { opacity: 1; pointer-events: auto; }

/* report button on lab card */
.lab__report {
  appearance: none;
  cursor: pointer;
  background: transparent;
  color: var(--fg-dim);
  border: 1px solid var(--line-2);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  padding: 6px 12px;
  transition: color .2s, border-color .2s, background .2s;
  margin-right: 8px;
}
.lab__report:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(255,91,31,0.06);
}

/* report reader panel */
.report {
  position: fixed; top: 0; right: 0; height: 100vh; width: min(820px, 100%);
  background: var(--bg-2);
  border-left: 1px solid var(--line-2);
  transform: translateX(100%);
  transition: transform .35s cubic-bezier(.2,.7,.2,1);
  z-index: 110;
  display: flex; flex-direction: column;
}
.report.open { transform: translateX(0); }
.report__head {
  display: flex; justify-content: space-between; align-items: center;
  padding: 24px 32px;
  border-bottom: 1px solid var(--line);
}
.report__crumb {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--fg-dim);
  text-transform: uppercase;
}
.report__body {
  flex: 1;
  overflow-y: auto;
  padding: 32px 48px 64px;
}
.report__loading {
  color: var(--fg-dim);
  font-family: var(--mono);
  font-size: 13px;
}

/* markdown body */
.markdown {
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.65;
  color: var(--fg);
}
.markdown h1 {
  font-size: 32px; font-weight: 800;
  letter-spacing: -0.02em;
  margin: 8px 0 4px;
  color: var(--fg);
}
.markdown h2 {
  font-size: 20px; font-weight: 700;
  margin: 28px 0 10px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--line);
  color: var(--fg);
}
.markdown h3 {
  font-size: 16px; font-weight: 600;
  margin: 22px 0 8px;
  color: var(--fg);
}
.markdown h4 {
  font-size: 13px; font-weight: 600;
  margin: 16px 0 6px;
  color: var(--fg-dim);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.markdown p { margin: 8px 0; color: var(--fg); }
.markdown ul, .markdown ol { padding-left: 24px; margin: 8px 0; }
.markdown li { margin: 3px 0; }
.markdown strong { color: var(--fg); }
.markdown em { color: var(--fg-dim); font-style: italic; }
.markdown hr {
  border: none;
  border-top: 1px solid var(--line);
  margin: 24px 0;
}
.markdown a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px dashed transparent;
  transition: border-color .2s ease;
}
.markdown a:hover { border-bottom-color: var(--accent); }
.markdown code {
  font-family: var(--mono);
  font-size: 0.9em;
  background: var(--bg);
  border: 1px solid var(--line);
  padding: 1px 6px;
  border-radius: 3px;
  color: var(--accent-2);
}
.markdown pre {
  background: var(--bg);
  border: 1px solid var(--line);
  padding: 14px 16px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.5;
  color: var(--fg);
  margin: 12px 0;
}
.markdown pre code {
  background: transparent;
  border: none;
  padding: 0;
  color: var(--fg);
}
.markdown table {
  width: 100%;
  border-collapse: collapse;
  margin: 14px 0;
  font-size: 13px;
}
.markdown th, .markdown td {
  text-align: left;
  padding: 8px 12px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
.markdown th {
  color: var(--fg-dim);
  font-family: var(--mono);
  font-weight: 500;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border-bottom: 1px solid var(--line-2);
}
.markdown blockquote {
  border-left: 2px solid var(--accent);
  padding: 4px 0 4px 16px;
  margin: 12px 0;
  color: var(--fg-dim);
}

/* enter animation for lab cards */
.lab { animation: slidein .5s cubic-bezier(.2,.7,.2,1) backwards; }
.lab:nth-child(1)  { animation-delay: 0.02s; }
.lab:nth-child(2)  { animation-delay: 0.06s; }
.lab:nth-child(3)  { animation-delay: 0.10s; }
.lab:nth-child(4)  { animation-delay: 0.14s; }
.lab:nth-child(5)  { animation-delay: 0.18s; }
.lab:nth-child(6)  { animation-delay: 0.22s; }
.lab:nth-child(7)  { animation-delay: 0.26s; }
.lab:nth-child(8)  { animation-delay: 0.30s; }
@keyframes slidein {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* responsive */
@media (max-width: 860px) {
  .topbar { padding: 14px 16px; }
  .page { padding: 32px 16px 80px; }
  .hero { padding: 16px 0 56px; }
  .exam__grid { grid-template-columns: 1fr; }
  .section-head { grid-template-columns: 40px 1fr; gap: 10px; }
  .section-head__badge { grid-column: 2; justify-self: start; margin-top: 4px; }
  .topic { padding: 18px 16px; grid-template-columns: 44px 1fr 18px; gap: 12px; }
  .topic__num { font-size: 22px; }
  .lab__head { grid-template-columns: 40px 1fr auto auto; gap: 10px; padding: 18px 16px; }
  .lab__count { display: none; }
  .lab__title { font-size: 18px; }
  .lab__inner { grid-template-columns: 1fr; }
  .col { border-right: none; border-bottom: 1px solid var(--line); }
  .col:last-child { border-bottom: none; }
  .drawer { width: 100%; padding: 24px 20px 32px; }
  .report { width: 100%; }
  .report__head { padding: 18px 20px; }
  .report__body { padding: 22px 20px 48px; }
  .markdown h1 { font-size: 24px; }
  .markdown h2 { font-size: 18px; }
  .lab__report { padding: 4px 8px; font-size: 11px; }
}