:root {
  color-scheme: dark;
  --ink: #f2f5ef;
  --ink-soft: #b7bdb5;
  --ink-dim: #747c74;
  --void: #050706;
  --surface: #090c0a;
  --surface-raised: #0d110e;
  --line: #242a25;
  --line-bright: #3a423b;
  --accent: #a6ff3f;
  --accent-soft: rgba(166, 255, 63, 0.12);
  --accent-faint: rgba(166, 255, 63, 0.055);
  --danger: #ffb8a8;
  --header-height: 72px;
  --mono: "SFMono-Regular", "Cascadia Code", "Roboto Mono", Consolas, monospace;
  --sans: Inter, "SF Pro Text", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  background: var(--void);
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  margin: 0;
  background:
    linear-gradient(rgba(166, 255, 63, 0.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(166, 255, 63, 0.018) 1px, transparent 1px),
    var(--void);
  background-size: 64px 64px;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.5;
  text-rendering: optimizeLegibility;
}

button,
input,
textarea {
  color: inherit;
  font: inherit;
}

button,
a,
input,
textarea {
  -webkit-tap-highlight-color: transparent;
}

button {
  border: 0;
}

a {
  color: inherit;
}

::selection {
  background: var(--accent);
  color: var(--void);
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--void);
}

::-webkit-scrollbar-thumb {
  border: 3px solid var(--void);
  background: var(--line-bright);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent);
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 10px;
  left: 10px;
  padding: 10px 14px;
  transform: translateY(-160%);
  background: var(--accent);
  color: var(--void);
  font-family: var(--mono);
  font-weight: 800;
}

.skip-link:focus {
  transform: translateY(0);
}

.visually-hidden,
.sr-live {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.app-shell {
  min-height: 100svh;
}

.topbar {
  position: sticky;
  z-index: 30;
  top: 0;
  display: grid;
  grid-template-columns: minmax(240px, 1fr) auto minmax(240px, 1fr);
  align-items: center;
  min-height: var(--header-height);
  padding: 0 28px;
  border-bottom: 1px solid var(--line);
  background: rgba(5, 7, 6, 0.94);
  backdrop-filter: blur(16px);
  animation: topbar-in 520ms cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

.topbar::after {
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 16%;
  height: 1px;
  background: var(--accent);
  content: "";
}

.brand {
  display: inline-flex;
  width: max-content;
  align-items: center;
  gap: 13px;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border: 1px solid var(--accent);
  color: var(--accent);
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 900;
  letter-spacing: -0.08em;
  transition:
    background 160ms ease,
    color 160ms ease;
}

.brand:hover .brand-mark {
  background: var(--accent);
  color: var(--void);
}

.brand-copy {
  display: flex;
  flex-direction: column;
  line-height: 1.05;
}

.brand-copy strong {
  font-size: 17px;
  font-weight: 900;
  letter-spacing: 0.16em;
}

.brand-copy span {
  margin-top: 5px;
  color: var(--ink-dim);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.2em;
}

.network-state {
  display: flex;
  align-items: center;
  justify-self: center;
  gap: 9px;
  color: var(--ink-dim);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.signal-dot,
.status-lamp {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 14px rgba(166, 255, 63, 0.75);
  animation: signal-pulse 2.4s ease-in-out infinite;
}

.network-separator {
  color: var(--line-bright);
}

.compact-only {
  display: none;
  justify-self: end;
}

.system-notice {
  position: fixed;
  z-index: 40;
  top: calc(var(--header-height) + 12px);
  right: 22px;
  display: grid;
  max-width: min(480px, calc(100vw - 32px));
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 13px 14px;
  border: 1px solid var(--line-bright);
  border-left-color: var(--accent);
  background: #0c100d;
  box-shadow: 0 16px 50px rgba(0, 0, 0, 0.4);
  font-size: 13px;
  animation: notice-in 220ms ease-out both;
}

.system-notice[data-tone="error"] {
  border-left-color: var(--danger);
}

.notice-code {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.system-notice[data-tone="error"] .notice-code {
  color: var(--danger);
}

.notice-close {
  width: 28px;
  height: 28px;
  background: transparent;
  color: var(--ink-dim);
  cursor: pointer;
  font-size: 20px;
}

.notice-close:hover {
  color: var(--ink);
}

.workspace {
  display: grid;
  width: 100%;
  max-width: 1800px;
  min-height: calc(100svh - var(--header-height) - 42px);
  grid-template-columns: minmax(245px, 0.82fr) minmax(520px, 2.7fr) minmax(290px, 1fr);
  margin: 0 auto;
}

.level-rail,
.ranking-rail {
  position: sticky;
  top: var(--header-height);
  height: calc(100svh - var(--header-height));
  overflow: hidden;
  background: rgba(7, 10, 8, 0.8);
}

.level-rail {
  display: grid;
  grid-template-rows: auto auto minmax(0, 1fr);
  border-right: 1px solid var(--line);
}

.ranking-rail {
  display: grid;
  grid-template-rows: auto auto minmax(0, 1fr) auto;
  border-left: 1px solid var(--line);
}

.puzzle-stage {
  min-width: 0;
  padding: clamp(30px, 4vw, 68px) clamp(26px, 4.2vw, 74px) 96px;
}

.entrance {
  animation: surface-in 560ms cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

.level-rail.entrance {
  animation-delay: 70ms;
}

.puzzle-stage.entrance {
  animation-delay: 130ms;
}

.ranking-rail.entrance {
  animation-delay: 190ms;
}

.rail-heading,
.section-heading {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px;
}

.rail-heading {
  min-height: 104px;
  padding: 26px 22px 18px;
  border-bottom: 1px solid var(--line);
}

.rail-heading h1,
.rail-heading h2,
.section-heading h3 {
  margin: 5px 0 0;
  font-size: 18px;
  font-weight: 690;
  letter-spacing: -0.02em;
}

.eyebrow {
  margin: 0;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.icon-button,
.text-button {
  background: transparent;
  color: var(--ink-dim);
  cursor: pointer;
  font-family: var(--mono);
  transition:
    color 150ms ease,
    border-color 150ms ease,
    background 150ms ease;
}

.icon-button {
  display: grid;
  width: 36px;
  height: 36px;
  flex: 0 0 auto;
  place-items: center;
  border: 1px solid var(--line);
  font-size: 17px;
}

.icon-button:hover,
.text-button:hover {
  color: var(--accent);
}

.icon-button:hover {
  border-color: var(--accent);
  background: var(--accent-faint);
}

.icon-button.is-refreshing {
  animation: refresh-spin 650ms linear infinite;
}

.icon-button:disabled,
.text-button:disabled,
.primary-button:disabled {
  cursor: not-allowed;
  opacity: 0.38;
}

.text-button {
  padding: 4px 0;
  font-size: 10px;
  letter-spacing: 0.08em;
}

.search-field {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 10px;
  margin: 18px 18px 10px;
  padding: 0 12px;
  border-bottom: 1px solid var(--line-bright);
  color: var(--ink-dim);
}

.search-field:focus-within {
  border-bottom-color: var(--accent);
  color: var(--accent);
}

.search-field input {
  width: 100%;
  min-height: 40px;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--ink);
  font-size: 12px;
}

.search-field input::placeholder,
input::placeholder,
textarea::placeholder {
  color: #596059;
}

.level-list {
  min-height: 0;
  padding: 8px 0 28px;
  overflow-y: auto;
}

.level-entry {
  position: relative;
  display: grid;
  width: 100%;
  grid-template-columns: 38px minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 16px 18px 15px 20px;
  border-top: 1px solid transparent;
  border-bottom: 1px solid transparent;
  background: transparent;
  color: var(--ink-soft);
  cursor: pointer;
  text-align: left;
  transition:
    color 140ms ease,
    background 140ms ease,
    border-color 140ms ease;
}

.level-entry::before {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 2px;
  transform: scaleY(0);
  background: var(--accent);
  content: "";
  transition: transform 160ms ease;
}

.level-entry:hover {
  background: rgba(255, 255, 255, 0.018);
  color: var(--ink);
}

.level-entry[aria-current="true"] {
  border-color: var(--line);
  background: var(--accent-faint);
  color: var(--ink);
}

.level-entry[aria-current="true"]::before {
  transform: scaleY(1);
}

.level-number {
  color: var(--ink-dim);
  font-family: var(--mono);
  font-size: 10px;
}

.level-entry[aria-current="true"] .level-number {
  color: var(--accent);
}

.level-copy {
  min-width: 0;
}

.level-copy strong {
  display: block;
  overflow: hidden;
  font-size: 13px;
  font-weight: 620;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.level-copy span {
  display: block;
  margin-top: 3px;
  overflow: hidden;
  color: var(--ink-dim);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.04em;
  text-overflow: ellipsis;
  text-transform: uppercase;
  white-space: nowrap;
}

.level-rate {
  color: var(--ink-dim);
  font-family: var(--mono);
  font-size: 9px;
}

.stage-empty {
  display: flex;
  min-height: 52svh;
  align-items: flex-start;
  justify-content: center;
  flex-direction: column;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.stage-empty h2 {
  max-width: 700px;
  margin: 18px 0 10px;
  font-size: clamp(36px, 5vw, 76px);
  line-height: 0.96;
  letter-spacing: -0.055em;
}

.stage-empty p:last-child {
  margin: 0;
  color: var(--ink-dim);
}

.puzzle-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: start;
  gap: 34px;
  padding-bottom: 34px;
  border-bottom: 1px solid var(--line-bright);
}

.puzzle-heading h2 {
  max-width: 820px;
  margin: 14px 0 18px;
  font-size: clamp(38px, 5.6vw, 82px);
  font-weight: 760;
  line-height: 0.94;
  letter-spacing: -0.06em;
}

.puzzle-story {
  max-width: 700px;
  margin: 0;
  color: var(--ink-soft);
  font-size: 16px;
  line-height: 1.75;
}

.difficulty-stamp {
  display: flex;
  min-width: 92px;
  align-items: flex-end;
  padding: 0 0 10px 14px;
  border-left: 1px solid var(--accent);
  flex-direction: column;
  text-align: right;
}

.difficulty-stamp span {
  color: var(--ink-dim);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.12em;
}

.difficulty-stamp strong {
  margin-top: 5px;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.level-facts {
  display: flex;
  align-items: stretch;
  border-bottom: 1px solid var(--line);
}

.level-fact {
  min-width: 0;
  flex: 1 1 0;
  padding: 18px 18px 16px 0;
}

.level-fact + .level-fact {
  padding-left: 18px;
  border-left: 1px solid var(--line);
}

.level-fact dt {
  margin: 0 0 5px;
  color: var(--ink-dim);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.level-fact dd {
  margin: 0;
  overflow: hidden;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 12px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.examples-section,
.session-section,
.query-section,
.answer-section {
  padding-top: 50px;
}

.section-heading {
  margin-bottom: 18px;
}

.section-heading > p {
  max-width: 52%;
  margin: 0;
  color: var(--ink-dim);
  font-family: var(--mono);
  font-size: 9px;
  line-height: 1.6;
  text-align: right;
}

.section-heading kbd {
  padding: 1px 4px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 8px;
}

.examples-list {
  border-top: 1px solid var(--line-bright);
}

.example-row {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr) 24px minmax(0, 1fr);
  align-items: start;
  gap: 12px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
}

.example-index {
  padding-top: 4px;
  color: var(--ink-dim);
  font-family: var(--mono);
  font-size: 9px;
}

.example-row code,
.challenge-input code {
  overflow-wrap: anywhere;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.65;
}

.example-arrow {
  color: var(--accent);
  font-family: var(--mono);
  text-align: center;
}

.session-form {
  padding: 22px 0 24px;
  border-top: 1px solid var(--line-bright);
  border-bottom: 1px solid var(--line);
}

.session-form > label,
.query-form > label {
  display: block;
  margin-bottom: 9px;
  color: var(--ink-dim);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.inline-control {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
}

input,
textarea {
  border: 1px solid var(--line-bright);
  border-radius: 0;
  outline: 0;
  background: #070a08;
  color: var(--ink);
}

input:focus,
textarea:focus {
  border-color: var(--accent);
  box-shadow: inset 3px 0 0 var(--accent);
}

.inline-control input {
  min-height: 48px;
  padding: 0 15px;
  border-right: 0;
}

.primary-button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 22px;
  padding: 0 19px;
  background: var(--accent);
  color: #071003;
  cursor: pointer;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.04em;
  transition:
    filter 140ms ease,
    transform 140ms ease;
}

.primary-button:hover:not(:disabled) {
  filter: brightness(1.12);
}

.primary-button:active:not(:disabled) {
  transform: translateY(1px);
}

.primary-button.is-busy .button-state,
.primary-button.is-busy > span:first-child {
  opacity: 0.55;
}

.session-strip {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: stretch;
  border-bottom: 1px solid var(--line);
  background: var(--accent-faint);
}

.session-strip > div {
  display: flex;
  min-width: 122px;
  align-items: center;
  gap: 10px;
  padding: 16px 18px;
  border-right: 1px solid var(--line);
  color: var(--accent);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.1em;
}

.session-strip dl {
  display: grid;
  min-width: 0;
  grid-template-columns: 1.3fr 0.8fr 0.8fr;
  margin: 0;
}

.session-strip dl > div {
  min-width: 0;
  padding: 13px 16px;
}

.session-strip dl > div + div {
  border-left: 1px solid var(--line);
}

.session-strip dt {
  color: var(--ink-dim);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.08em;
}

.session-strip dd {
  margin: 4px 0 0;
  overflow: hidden;
  font-family: var(--mono);
  font-size: 11px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.query-form {
  border-top: 1px solid var(--line-bright);
  padding-top: 20px;
}

.query-form textarea {
  display: block;
  width: 100%;
  min-height: 92px;
  padding: 14px 15px;
  resize: vertical;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.65;
}

textarea:disabled,
input:disabled {
  color: var(--ink-dim);
  cursor: not-allowed;
}

.query-actions,
.submission-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 12px 0 0;
}

.query-actions p,
.submission-bar p {
  margin: 0;
  color: var(--ink-dim);
  font-family: var(--mono);
  font-size: 9px;
}

.console-output {
  margin-top: 22px;
  border: 1px solid var(--line);
  background: #050806;
}

.console-header {
  display: flex;
  min-height: 38px;
  align-items: center;
  justify-content: space-between;
  padding: 0 13px;
  border-bottom: 1px solid var(--line);
  color: var(--ink-dim);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.12em;
}

.console-output ol {
  max-height: 380px;
  margin: 0;
  padding: 0;
  overflow: auto;
  list-style: none;
}

.console-empty {
  padding: 26px 14px;
  color: var(--ink-dim);
  font-family: var(--mono);
  font-size: 10px;
  text-align: center;
}

.console-line {
  position: relative;
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) auto;
  gap: 11px;
  padding: 13px 14px;
  border-bottom: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 10px;
}

.console-line:last-child {
  border-bottom: 0;
}

.console-line.is-new {
  animation: result-in 420ms cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

.console-line.is-new::before {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 2px;
  background: var(--accent);
  content: "";
  animation: query-trace 700ms ease-out both;
}

.console-sequence {
  color: var(--accent);
}

.console-io {
  min-width: 0;
}

.console-io div {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
  gap: 8px;
}

.console-io div + div {
  margin-top: 5px;
}

.console-io span {
  color: var(--ink-dim);
}

.console-io code {
  overflow-wrap: anywhere;
  color: var(--ink-soft);
  line-height: 1.5;
}

.console-line[data-tone="error"] .console-io code {
  color: var(--danger);
}

.console-meta {
  color: var(--ink-dim);
  font-size: 8px;
  white-space: nowrap;
}

.answer-editor {
  border-top: 1px solid var(--line-bright);
}

.answer-placeholder {
  display: flex;
  min-height: 112px;
  align-items: center;
  justify-content: center;
  gap: 12px;
  border-bottom: 1px solid var(--line);
  color: var(--ink-dim);
}

.answer-placeholder span {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 22px;
}

.answer-placeholder p {
  margin: 0;
  font-size: 12px;
}

.answer-row {
  display: grid;
  grid-template-columns: 42px minmax(150px, 0.8fr) minmax(180px, 1fr);
  align-items: stretch;
  border-bottom: 1px solid var(--line);
}

.answer-index {
  display: grid;
  place-items: center;
  border-right: 1px solid var(--line);
  color: var(--ink-dim);
  font-family: var(--mono);
  font-size: 9px;
}

.challenge-input {
  display: flex;
  min-width: 0;
  align-items: center;
  padding: 13px 15px;
}

.answer-row label {
  display: grid;
  min-width: 0;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: stretch;
  border-left: 1px solid var(--line);
}

.answer-row label span {
  display: grid;
  place-items: center;
  padding: 0 10px;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 9px;
}

.answer-row textarea {
  width: 100%;
  min-height: 64px;
  padding: 12px;
  border: 0;
  border-left: 1px solid var(--line);
  resize: vertical;
  font-family: var(--mono);
  font-size: 11px;
}

.answer-row textarea:focus {
  border-left-color: var(--accent);
}

.submission-result {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  align-items: center;
  margin-top: 24px;
  border-top: 1px solid var(--accent);
  border-bottom: 1px solid var(--line);
  background: var(--accent-faint);
  animation: result-verdict 360ms cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

.submission-result[data-result="fail"] {
  border-top-color: var(--danger);
  background: rgba(255, 184, 168, 0.05);
}

.result-glyph {
  display: grid;
  min-height: 82px;
  place-items: center;
  border-right: 1px solid var(--line);
  color: var(--accent);
  font-family: var(--mono);
  font-size: 24px;
}

.submission-result[data-result="fail"] .result-glyph {
  color: var(--danger);
}

.submission-result > div {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 16px 18px;
  flex-wrap: wrap;
}

.submission-result p {
  width: 100%;
  margin: 0;
  color: var(--ink-dim);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.12em;
}

.submission-result strong {
  font-size: 16px;
}

.submission-result span:last-child {
  color: var(--ink-dim);
  font-family: var(--mono);
  font-size: 10px;
}

.rank-tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-bottom: 1px solid var(--line);
}

.rank-tabs button {
  position: relative;
  min-height: 44px;
  border-right: 1px solid var(--line);
  background: transparent;
  color: var(--ink-dim);
  cursor: pointer;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.05em;
}

.rank-tabs button:last-child {
  border-right: 0;
}

.rank-tabs button::after {
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 1px;
  transform: scaleX(0);
  background: var(--accent);
  content: "";
  transition: transform 170ms ease;
}

.rank-tabs button[aria-selected="true"] {
  background: var(--accent-faint);
  color: var(--accent);
}

.rank-tabs button[aria-selected="true"]::after {
  transform: scaleX(1);
}

.ranking-panel {
  min-height: 0;
  overflow: auto;
  outline: 0;
}

.ranking-list {
  min-height: 100%;
  transition:
    opacity 160ms ease,
    transform 160ms ease;
}

.ranking-rail.is-refreshing .ranking-list {
  opacity: 0.42;
  transform: translateY(4px);
}

.ranking-rail.is-refreshing .refresh-icon {
  display: block;
  animation: refresh-spin 650ms linear infinite;
}

.ranking-row {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) auto;
  gap: 11px;
  padding: 16px 19px;
  border-bottom: 1px solid var(--line);
  animation: ranking-in 300ms ease-out both;
}

.ranking-row:nth-child(2) {
  animation-delay: 30ms;
}

.ranking-row:nth-child(3) {
  animation-delay: 60ms;
}

.ranking-row:nth-child(4) {
  animation-delay: 90ms;
}

.ranking-row:nth-child(5) {
  animation-delay: 120ms;
}

.rank-position {
  color: var(--ink-dim);
  font-family: var(--mono);
  font-size: 10px;
}

.ranking-row:nth-child(-n + 3) .rank-position {
  color: var(--accent);
}

.rank-identity {
  min-width: 0;
}

.rank-identity strong {
  display: block;
  overflow: hidden;
  font-size: 12px;
  font-weight: 620;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.rank-identity span {
  display: block;
  margin-top: 3px;
  overflow: hidden;
  color: var(--ink-dim);
  font-family: var(--mono);
  font-size: 8px;
  text-overflow: ellipsis;
  text-transform: uppercase;
  white-space: nowrap;
}

.rank-score {
  align-self: center;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  text-align: right;
}

.rank-score small {
  display: block;
  margin-top: 2px;
  color: var(--ink-dim);
  font-size: 7px;
  font-weight: 400;
  letter-spacing: 0.08em;
}

.ranking-empty,
.level-empty {
  display: flex;
  min-height: 190px;
  align-items: center;
  justify-content: center;
  padding: 28px;
  flex-direction: column;
  color: var(--ink-dim);
  text-align: center;
}

.ranking-empty strong,
.level-empty strong {
  color: var(--ink-soft);
  font-size: 13px;
}

.ranking-empty p,
.level-empty p {
  max-width: 240px;
  margin: 7px 0 16px;
  font-size: 11px;
}

.ranking-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 13px 18px;
  border-top: 1px solid var(--line);
  color: var(--ink-dim);
  font-family: var(--mono);
  font-size: 8px;
}

.loading-lines {
  padding: 20px;
}

.loading-lines span {
  display: block;
  width: 100%;
  height: 34px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(
    90deg,
    transparent 0,
    rgba(255, 255, 255, 0.035) 45%,
    transparent 80%
  );
  background-size: 220% 100%;
  animation: loading-sweep 1.35s ease-in-out infinite;
}

.loading-lines span:nth-child(2) {
  animation-delay: 80ms;
}

.loading-lines span:nth-child(3) {
  animation-delay: 160ms;
}

.loading-lines span:nth-child(4) {
  animation-delay: 240ms;
}

.app-footer {
  display: flex;
  min-height: 42px;
  align-items: center;
  justify-content: space-between;
  padding: 0 28px;
  border-top: 1px solid var(--line);
  color: var(--ink-dim);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.09em;
}

.boot-scan {
  position: fixed;
  z-index: 90;
  top: 0;
  right: 0;
  left: 0;
  height: 1px;
  pointer-events: none;
  background: var(--accent);
  box-shadow: 0 0 20px var(--accent);
  opacity: 0;
  animation: boot-scan 760ms 100ms cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

@keyframes topbar-in {
  from {
    opacity: 0;
    transform: translateY(-12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes surface-in {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes boot-scan {
  0% {
    opacity: 0;
    transform: translateY(0);
  }
  18% {
    opacity: 0.7;
  }
  100% {
    opacity: 0;
    transform: translateY(100svh);
  }
}

@keyframes signal-pulse {
  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.45;
    transform: scale(0.76);
  }
}

@keyframes notice-in {
  from {
    opacity: 0;
    transform: translateY(-7px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes loading-sweep {
  from {
    background-position: 180% 0;
  }
  to {
    background-position: -80% 0;
  }
}

@keyframes result-in {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes query-trace {
  0% {
    opacity: 1;
    transform: scaleY(0);
    transform-origin: top;
  }
  45% {
    transform: scaleY(1);
  }
  100% {
    opacity: 0.28;
    transform: scaleY(1);
  }
}

@keyframes result-verdict {
  from {
    opacity: 0;
    transform: translateY(9px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes ranking-in {
  from {
    opacity: 0;
    transform: translateX(6px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes refresh-spin {
  to {
    transform: rotate(360deg);
  }
}

@media (max-width: 1180px) {
  .topbar {
    grid-template-columns: 1fr auto 1fr;
  }

  .compact-only {
    display: inline-flex;
    align-items: center;
    gap: 8px;
  }

  .workspace {
    grid-template-columns: minmax(235px, 0.72fr) minmax(0, 2fr);
  }

  .ranking-rail {
    position: static;
    height: auto;
    min-height: 430px;
    grid-column: 1 / -1;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .ranking-panel {
    max-height: 560px;
  }

  .ranking-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .ranking-row:nth-child(odd) {
    border-right: 1px solid var(--line);
  }
}

@media (max-width: 760px) {
  :root {
    --header-height: 62px;
  }

  body {
    background-size: 44px 44px;
  }

  .topbar {
    grid-template-columns: 1fr auto;
    padding: 0 16px;
  }

  .brand-mark {
    width: 34px;
    height: 34px;
  }

  .brand-copy strong {
    font-size: 14px;
  }

  .network-state {
    display: none;
  }

  .workspace {
    display: block;
  }

  .level-rail,
  .ranking-rail {
    position: static;
    height: auto;
  }

  .level-rail {
    display: block;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .rail-heading {
    min-height: 86px;
    padding: 20px 16px 14px;
  }

  .search-field {
    margin: 12px 16px 5px;
  }

  .level-list {
    display: grid;
    grid-auto-columns: minmax(240px, 82vw);
    grid-auto-flow: column;
    padding: 8px 8px 18px;
    overflow-x: auto;
    overflow-y: hidden;
    overscroll-behavior-inline: contain;
    scroll-snap-type: x proximity;
  }

  .level-entry {
    scroll-snap-align: start;
    border-right: 1px solid var(--line);
  }

  .puzzle-stage {
    padding: 38px 18px 72px;
  }

  .puzzle-header {
    grid-template-columns: 1fr;
    gap: 22px;
  }

  .puzzle-heading h2 {
    font-size: clamp(40px, 12.5vw, 56px);
  }

  .difficulty-stamp {
    align-items: flex-start;
    padding: 0 0 0 12px;
    text-align: left;
  }

  .level-facts {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .level-fact,
  .level-fact + .level-fact {
    padding: 14px 12px;
    border-left: 0;
  }

  .level-fact:nth-child(even) {
    border-left: 1px solid var(--line);
  }

  .level-fact:nth-child(n + 3) {
    border-top: 1px solid var(--line);
  }

  .section-heading {
    align-items: flex-start;
    flex-direction: column;
    gap: 7px;
  }

  .section-heading > p {
    max-width: none;
    text-align: left;
  }

  .example-row {
    grid-template-columns: 28px minmax(0, 1fr);
  }

  .example-arrow {
    display: none;
  }

  .example-row code:last-child {
    grid-column: 2;
    padding-top: 8px;
    border-top: 1px dashed var(--line);
  }

  .inline-control {
    grid-template-columns: 1fr;
  }

  .inline-control input {
    border-right: 1px solid var(--line-bright);
    border-bottom: 0;
  }

  .session-strip {
    grid-template-columns: 1fr;
  }

  .session-strip > div {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .session-strip dl {
    grid-template-columns: 1fr 1fr;
  }

  .session-strip dl > div:first-child {
    grid-column: 1 / -1;
    border-bottom: 1px solid var(--line);
  }

  .session-strip dl > div:nth-child(2) {
    border-left: 0;
  }

  .query-actions,
  .submission-bar {
    align-items: stretch;
    flex-direction: column;
  }

  .query-actions .primary-button,
  .submission-bar .primary-button {
    width: 100%;
  }

  .console-line {
    grid-template-columns: 30px minmax(0, 1fr);
  }

  .console-meta {
    grid-column: 2;
  }

  .answer-row {
    grid-template-columns: 36px minmax(0, 1fr);
  }

  .answer-index {
    grid-row: 1 / 3;
  }

  .answer-row label {
    grid-column: 2;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .ranking-list {
    display: block;
  }

  .ranking-row:nth-child(odd) {
    border-right: 0;
  }

  .app-footer {
    align-items: flex-start;
    padding: 15px 18px;
    flex-direction: column;
    gap: 5px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}