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

:root {
  --bg: #2b2b2b;
  --bg-deeper: #1e1e1e;
  --card-dark: #111111;
  --surface: #1f1f1f;
  --surface-2: #252525;

  --border: rgba(255, 255, 255, 0.07);
  --border-md: rgba(255, 255, 255, 0.11);

  --text-pri: #f0f0f0;
  --text-sec: rgba(255, 255, 255, 0.38);
  --text-dim: rgba(255, 255, 255, 0.18);

  --accent: #c97f50;

  --radius: 18px;
  --radius-sm: 10px;

  --font-ui: "Inter", system-ui, sans-serif;
  --font-mono: "Space Mono", monospace;

  --fs-2xs: clamp(10px, 0.18vw + 9px, 12px);
  --fs-xs: clamp(11px, 0.24vw + 9px, 13px);
  --fs-sm: clamp(12px, 0.3vw + 10px, 14px);
  --fs-md: clamp(13px, 0.4vw + 10px, 16px);
  --fs-lg: clamp(16px, 0.7vw + 11px, 22px);

  --clr-green: #6ca965;
  --clr-red: #cd5c5c;
  --clr-yellow: #c8b653;
  --clr-gray: #787c7f;
  --clr-empty: #1a1a1a;
  --clr-empty-border: rgba(255, 255, 255, 0.13);
}

html,
body {
  height: 100%;
  background: var(--bg);
  color: var(--text-pri);
  font-family: var(--font-ui);
  -webkit-font-smoothing: antialiased;
}

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  padding: 18px 28px;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--border);
  background: rgba(43, 43, 43, 0.92);
  backdrop-filter: blur(8px);
}

.header-title {
  font-size: var(--fs-md);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.header-dot {
  width: 6px;
  height: 6px;
  border-radius: 99px;
  background: var(--clr-green);
}

.header-sub {
  font-family: var(--font-mono);
  color: var(--text-sec);
  font-size: var(--fs-xs);
}

.header-tags {
  display: flex;
  gap: 6px;
  margin-left: auto;
}

.setting-tag {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 5px 10px;
  border-radius: 7px;
  border: 1px solid rgba(108, 169, 101, 0.25);
  color: var(--clr-green);
  background: rgba(108, 169, 101, 0.12);
}

.mode-link {
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text-sec);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 10px;
  transition: color 0.12s, border-color 0.12s, background 0.12s;
}

.mode-link:hover {
  color: var(--text-pri);
  border-color: var(--border-md);
  background: var(--surface);
}

.icon-btn {
  width: 40px;
  height: 34px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-ui);
  font-size: 18px;
  font-weight: 600;
  line-height: 1;
  transition: color 0.12s, border-color 0.12s, background 0.12s;
}

.icon-btn:hover {
  color: var(--text-sec);
  border-color: var(--border-md);
  background: var(--surface);
}

.icon-btn.active {
  color: var(--text-pri);
  border-color: rgba(255, 255, 255, 0.18);
  background: var(--surface-2);
}

.guesses-left-badge {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.04em;
  background: rgba(201, 127, 80, 0.1);
  border: 1px solid rgba(201, 127, 80, 0.2);
  border-radius: 8px;
  padding: 6px 12px;
}

.main {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  min-height: 100vh;
  overflow-x: hidden;
  overflow-y: auto;
  padding: 72px 16px 64px;
}

.solver-layout {
  display: flex;
  gap: 16px;
  width: 100%;
  max-width: 1280px;
  height: 100%;
  align-items: stretch;
}

.left-panel {
  flex: 0 0 360px;
  min-width: 220px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  overflow-y: auto;
  overflow-x: hidden;
}

.left-panel {
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.1) transparent;
}

.left-panel::-webkit-scrollbar {
  width: 4px;
}

.left-panel::-webkit-scrollbar-track {
  background: transparent;
}

.left-panel::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 2px;
}

.right-panel {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer {
  position: fixed;
  bottom: 0;
  left: 0;
  padding: 14px 28px;
  z-index: 10;
}

.footer-credit {
  font-family: var(--font-mono);
  font-size: var(--fs-2xs);
  color: var(--text-dim);
}

.panel {
  background: var(--card-dark);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: 0 12px 48px rgba(0, 0, 0, 0.55), 0 2px 8px rgba(0, 0, 0, 0.3);
  padding: 22px 20px 20px;
}

.float-panel {
  position: fixed;
  top: 54px;
  right: 90px;
  background: var(--card-dark);
  border: 1px solid var(--border-md);
  border-radius: var(--radius-sm);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.65);
  z-index: 200;
  display: none;
}

.float-panel.open {
  display: block;
}

.settings-panel {
  width: min(360px, calc(100vw - 24px));
  padding: 14px 16px;
}

.compact-input {
  margin-bottom: 8px;
  font-size: var(--fs-md);
  letter-spacing: 0.06em;
}

.compact-row {
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 8px;
}

.keybind-grid {
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.keybind-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 10px 12px;
}

.keybind-row:last-child {
  border-bottom: none;
}

.keybind-input {
  width: 96px;
  border: 1px solid var(--border-md);
  border-radius: 7px;
  padding: 6px 8px;
  background: var(--card-dark);
  color: var(--text-pri);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  text-align: center;
  text-transform: uppercase;
}

.keybind-input:focus {
  border-color: rgba(255, 255, 255, 0.2);
}

.panel-title {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-sec);
  margin-bottom: 8px;
  font-family: var(--font-mono);
}

.section-label {
  display: block;
  margin-bottom: 4px;
  font-size: var(--fs-2xs);
  color: var(--text-dim);
  font-family: var(--font-mono);
  text-transform: uppercase;
}

.word-input {
  width: 100%;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-md);
  background: var(--surface);
  color: var(--text-pri);
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  letter-spacing: 0.04em;
  margin-bottom: 8px;
}

.slider {
  width: 100%;
  accent-color: var(--accent);
}

.hint-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-sec);
  font-size: var(--fs-2xs);
}

:where(a, button, input, textarea, select, [role="button"]):focus-visible {
  outline: 2px solid rgba(201, 127, 80, 0.9);
  outline-offset: 2px;
}

.toggle-list {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow-y: auto;
  overflow-x: hidden;
  max-height: 260px;
  margin-bottom: 8px;
}

.toggle-list {
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.1) transparent;
}

.toggle-list::-webkit-scrollbar {
  width: 4px;
}

.toggle-list::-webkit-scrollbar-track {
  background: transparent;
}

.toggle-list::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 2px;
}

.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.toggle-row:last-child {
  border-bottom: none;
}

.toggle-label {
  font-size: var(--fs-sm);
  color: var(--text-pri);
}

.btn-analyze {
  width: 100%;
  padding: 16px;
  border-radius: var(--radius-sm);
  background: var(--text-pri);
  color: #111;
  font-family: var(--font-mono);
  font-size: clamp(15px, 0.45vw + 12px, 18px);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: none;
  cursor: pointer;
  transition: opacity 0.12s, transform 0.08s;
  margin-top: 6px;
}

.btn-analyze:hover {
  opacity: 0.88;
  transform: translateY(-1px);
}

.btn-analyze:active {
  opacity: 0.78;
  transform: translateY(0);
}

.row-buttons {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.btn-reset {
  flex: 1;
  min-width: 136px;
  padding: 13px 12px;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-sec);
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border: 1px solid var(--border);
  cursor: pointer;
  transition: color 0.12s, border-color 0.12s, transform 0.08s;
}

.btn-reset:hover {
  color: var(--text-pri);
  border-color: var(--border-md);
  transform: translateY(-1px);
}

.btn-reset:disabled,
.btn-analyze:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

.btn-correct {
  color: var(--clr-green);
  border-color: rgba(108, 169, 101, 0.35);
  background: rgba(108, 169, 101, 0.08);
}

.btn-correct:hover {
  color: #b8e4b4;
  border-color: rgba(108, 169, 101, 0.5);
  background: rgba(108, 169, 101, 0.16);
}

.btn-wrong {
  color: var(--clr-red);
  border-color: rgba(205, 92, 92, 0.35);
  background: rgba(205, 92, 92, 0.08);
}

.btn-wrong:hover {
  color: #efb1b1;
  border-color: rgba(205, 92, 92, 0.5);
  background: rgba(205, 92, 92, 0.16);
}

.problem-meta {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.known-chip {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  font-weight: 700;
  padding: 5px 10px;
  border-radius: 7px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.chip-green {
  background: rgba(108, 169, 101, 0.15);
  color: var(--clr-green);
  border: 1px solid rgba(108, 169, 101, 0.3);
}

.chip-yellow {
  background: rgba(200, 182, 83, 0.15);
  color: var(--clr-yellow);
  border: 1px solid rgba(200, 182, 83, 0.3);
}

.equation-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px;
}

.equation-label {
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-sec);
  font-family: var(--font-mono);
  margin-bottom: 8px;
}

.equation-latex {
  min-height: 54px;
  display: flex;
  align-items: center;
  color: var(--text-pri);
  font-size: clamp(17px, 0.8vw + 14px, 28px);
  overflow-x: auto;
}

.countdown-block {
  margin-bottom: 2px;
}

.countdown-value {
  font-family: var(--font-mono);
  font-size: clamp(22px, 1vw + 16px, 34px);
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--accent);
  line-height: 1.15;
}

.countdown-hint {
  margin-top: 6px;
  color: var(--text-sec);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.03em;
}

.hidden {
  display: none;
}

.answer-input {
  width: 100%;
  min-height: 90px;
  resize: vertical;
  padding: 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-md);
  background: var(--surface);
  color: var(--text-pri);
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
}

.stats-bar {
  display: flex;
  gap: 10px;
}

.stat-chip {
  flex: 1;
  padding: 13px 16px;
  border-radius: var(--radius-sm);
  background: var(--surface);
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.stat-val {
  font-family: var(--font-mono);
  font-size: var(--fs-lg);
  font-weight: 700;
  color: var(--text-pri);
  letter-spacing: -0.02em;
}

.stat-lbl {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-sec);
}

.stat-possible .stat-val {
  color: var(--clr-green);
}

.stat-guesses .stat-val {
  color: var(--accent);
}

.stat-chip.stat-toggle {
  cursor: pointer;
  user-select: none;
}

.stat-chip.stat-toggle:hover {
  border-color: var(--border-md);
}

.aon-prompt-backdrop {
  position: fixed;
  inset: 0;
  z-index: 600;
  background: rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(2px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 14px;
}

.aon-prompt-panel {
  width: min(360px, calc(100vw - 28px));
  background: var(--surface-2);
  border: 1px solid var(--border-md);
  border-radius: 12px;
  box-shadow: 0 16px 42px rgba(0, 0, 0, 0.5);
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.aon-prompt-title {
  font-family: var(--font-ui);
  font-size: var(--fs-sm);
  color: var(--text-pri);
}

.aon-prompt-input {
  width: 100%;
  border-radius: 8px;
  border: 1px solid var(--border-md);
  background: var(--card-dark);
  color: var(--text-pri);
  font-family: var(--font-mono);
  font-size: var(--fs-md);
  padding: 10px 12px;
}

.aon-prompt-input:focus {
  border-color: rgba(255, 255, 255, 0.25);
}

.aon-prompt-error {
  display: none;
  font-family: var(--font-mono);
  font-size: var(--fs-2xs);
  color: var(--clr-red);
}

.aon-prompt-panel.invalid .aon-prompt-input {
  border-color: rgba(205, 92, 92, 0.6);
}

.aon-prompt-panel.invalid .aon-prompt-error {
  display: block;
}

.aon-prompt-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}

.aon-btn-cancel {
  min-width: 86px;
  flex: 0 0 auto;
}

.aon-btn-ok {
  min-width: 64px;
  padding: 8px 12px;
  width: auto;
  flex: 0 0 auto;
  margin-top: 0;
}

.history-title {
  margin-top: 8px;
}

.history-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
  padding-right: 2px;
}

.history-list {
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.1) transparent;
}

.history-list::-webkit-scrollbar {
  width: 4px;
}

.history-list::-webkit-scrollbar-track {
  background: transparent;
}

.history-list::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 2px;
}

.guess-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
}

.guess-rank {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-dim);
  width: 32px;
  flex-shrink: 0;
}

.guess-word {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-pri);
  flex: 1;
}

.guess-score {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-sec);
}

.warn-banner {
  padding: 9px 12px;
  border-radius: 8px;
  background: rgba(201, 127, 80, 0.1);
  border: 1px solid rgba(201, 127, 80, 0.22);
  font-size: 11px;
  color: var(--accent);
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
  line-height: 1.5;
}

.zen-page {
  background: var(--card-dark);
}

.zen-main {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 86px 14px 24px;
  background: var(--card-dark);
}

.zen-panel {
  width: min(980px, 100%);
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: var(--card-dark);
  border: none;
  box-shadow: none;
  border-radius: 0;
  padding: 0;
}

.zen-expression-shell {
  min-height: clamp(340px, 60vh, 620px);
  border: none;
  border-radius: 0;
  background: var(--card-dark);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: stretch;
  padding: 20px 12px;
}

.zen-derivative-wrap {
  min-height: clamp(160px, 35vh, 310px);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 0 8px;
}

.zen-derivative {
  width: 100%;
  text-align: center;
  color: var(--text-pri);
  font-family: var(--font-mono);
  font-size: clamp(34px, 6.8vw, 98px);
  line-height: 1.05;
}

.zen-derivative .katex-display {
  margin: 0;
}

.zen-reveal-block {
  min-height: clamp(78px, 11vh, 120px);
  border-top: 1px dashed var(--border);
  margin-top: 14px;
  padding-top: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease;
}

.zen-reveal-block.visible {
  opacity: 1;
  visibility: visible;
}

.zen-original {
  color: var(--text-sec);
  text-align: center;
  font-size: clamp(20px, 2.8vw, 34px);
  min-height: 40px;
}

.zen-original .katex-display {
  margin: 0;
}

.zen-timer-wrap {
  position: relative;
  width: 100%;
  height: 20px;
  border-radius: 999px;
  background: #161616;
  border: 1px solid var(--border);
  overflow: hidden;
}

.zen-timer-bar {
  width: 100%;
  height: 100%;
  background: hsl(120 42% 42%);
  transition: width 0.1s linear, background 0.2s linear;
}

.zen-timer-text {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: #0f0f0f;
  mix-blend-mode: screen;
}

.zen-actions .btn-analyze {
  margin-top: 0;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.zen-actions {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.zen-actions.judging #zenRevealBtn {
  opacity: 0;
  transform: translateY(-8px);
  pointer-events: none;
}

.zen-judge-panel {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transform: translateY(-8px);
  pointer-events: none;
  transition: max-height 0.26s ease, opacity 0.2s ease, transform 0.24s ease;
}

.zen-judge-panel.open {
  max-height: 170px;
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.zen-judge-title {
  margin-top: 6px;
  margin-bottom: 10px;
}

.zen-judge-buttons .btn-reset {
  min-width: 120px;
}

.zen-layout {
  width: min(1500px, 100%);
  display: flex;
  gap: 20px;
  align-items: center;
}

.idx-main {
  align-items: center;
}

.zen-layout .zen-panel {
  flex: 1 1 auto;
  min-width: 0;
  transition: flex-basis 0.2s ease;
}

.zen-settings-side {
  flex: 0 0 25%;
  width: auto;
  min-width: 300px;
  max-width: 420px;
  max-height: calc(100vh - 112px);
  overflow-y: auto;
  overflow-x: hidden;
  position: sticky;
  top: 86px;
  display: flex;
  flex-direction: column;
  padding: 16px 16px 14px;
  transition: max-width 0.24s ease, min-width 0.24s ease, opacity 0.18s ease, transform 0.24s ease, padding 0.2s ease, border-color 0.2s ease;
}

.zen-layout:not(.settings-open) .zen-settings-side {
  max-width: 0;
  min-width: 0;
  padding: 0;
  border-color: transparent;
  opacity: 0;
  transform: translateX(10px);
  pointer-events: none;
  overflow: hidden;
}

.zen-layout.settings-open .zen-panel {
  flex-basis: 75%;
}

.zen-layout:not(.settings-open) .zen-panel {
  flex-basis: 100%;
}

.idx-layout {
  display: flex;
  gap: 20px;
  width: 100%;
  max-width: 1500px;
  align-items: center;
}

.idx-layout .idx-panel {
  flex: 1 1 auto;
  min-width: 0;
  height: auto;
  transition: flex-basis 0.2s ease;
}

.idx-settings-side {
  flex: 0 0 25%;
  width: auto;
  min-width: 300px;
  max-width: 420px;
  max-height: calc(100vh - 112px);
  overflow-y: auto;
  overflow-x: hidden;
  position: sticky;
  top: 86px;
  display: flex;
  flex-direction: column;
  padding: 16px 16px 14px;
  transition: max-width 0.24s ease, min-width 0.24s ease, opacity 0.18s ease, transform 0.24s ease, padding 0.2s ease, border-color 0.2s ease;
}

.idx-layout:not(.settings-open) .idx-settings-side {
  max-width: 0;
  min-width: 0;
  padding: 0;
  border-color: transparent;
  opacity: 0;
  transform: translateX(10px);
  pointer-events: none;
  overflow: hidden;
}

.idx-layout.settings-open .idx-panel {
  flex-basis: 75%;
}

.idx-layout:not(.settings-open) .idx-panel {
  flex-basis: 100%;
}

.pz-select {
  text-align: left;
  font-size: var(--fs-sm);
  letter-spacing: 0.02em;
  text-transform: none;
}

.pz-type-group {
  margin: 0;
  padding: 8px 12px 6px;
  background: #181818;
  border-bottom: 1px solid var(--border);
  font-size: 10px;
}

.pz-panel {
  gap: 14px;
}

.pz-main {
  align-items: center;
}

.pz-layout {
  width: min(1500px, 100%);
  display: flex;
  gap: 20px;
  align-items: center;
}

.pz-layout .pz-panel {
  flex: 1 1 auto;
  min-width: 0;
  transition: flex-basis 0.2s ease;
}

.pz-settings-side {
  flex: 0 0 25%;
  width: auto;
  min-width: 300px;
  max-width: 420px;
  max-height: calc(100vh - 112px);
  overflow-y: auto;
  overflow-x: hidden;
  position: sticky;
  top: 86px;
  display: flex;
  flex-direction: column;
  padding: 16px 16px 14px;
  overscroll-behavior: contain;
  transition: max-width 0.24s ease, min-width 0.24s ease, opacity 0.18s ease, transform 0.24s ease, padding 0.2s ease, border-color 0.2s ease;
}

.pz-layout:not(.settings-open) .pz-settings-side {
  max-width: 0;
  min-width: 0;
  padding: 0;
  border-color: transparent;
  opacity: 0;
  transform: translateX(10px);
  pointer-events: none;
  overflow: hidden;
}

.pz-layout.settings-open .pz-panel {
  flex-basis: 75%;
}

.pz-layout:not(.settings-open) .pz-panel {
  flex-basis: 100%;
}

.pz-settings-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.pz-close-btn {
  min-width: 84px;
  flex: 0 0 auto;
  padding: 6px 10px;
  font-size: 11px;
}

.pz-settings-side .panel-title {
  margin-bottom: 0;
}

.pz-settings-side .section-label {
  margin-top: 8px;
}

.pz-settings-side .word-input {
  padding: 10px 12px;
  font-size: var(--fs-sm);
  letter-spacing: 0.04em;
  border-radius: 9px;
}

.pz-settings-side .compact-input {
  margin-bottom: 6px;
}

.pz-settings-side .toggle-row {
  padding: 8px 10px;
}

.pz-settings-side .toggle-label {
  font-size: var(--fs-xs);
}

.pz-settings-side .hint-row {
  font-size: 10px;
}

.pz-settings-side .toggle-list {
  min-height: 160px;
  max-height: min(34vh, 320px);
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
}

.pz-expression-shell {
  min-height: clamp(300px, 48vh, 520px);
}

.pz-paused-placeholder {
  font-size: clamp(22px, 3.6vw, 40px);
  letter-spacing: 0.03em;
  color: var(--text-sec);
  font-family: var(--font-mono);
}

.pz-key-row .btn-analyze,
.pz-key-row .btn-reset {
  min-width: 190px;
}

.pz-stats {
  margin-top: 2px;
}

.analysis-main {
  padding-top: 78px;
}

.analysis-layout {
  max-width: 1320px;
}

.analysis-side {
  flex: 0 0 390px;
}

.analysis-stats {
  display: flex;
  flex-direction: column;
}

.analysis-main-panel {
  overflow: hidden;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.analysis-list {
  max-height: 42vh;
}

#anTypeBreakdown.analysis-list {
  min-height: 0;
  max-height: none;
  flex: 1;
}

#anRecent.analysis-list {
  min-height: 0;
  max-height: none;
  flex: 1;
}

.analysis-title-gap {
  margin-top: 12px;
}

.analysis-train-controls {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.analysis-train-controls .btn-analyze {
  margin-top: 0;
}

.analysis-train-hint {
  margin-top: 2px;
}

.analysis-view-menu {
  display: flex;
  gap: 6px;
  padding: 4px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface);
}

.analysis-view-btn {
  flex: 1;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  color: var(--text-sec);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 8px 8px;
  cursor: pointer;
  transition: color 0.14s ease, border-color 0.14s ease, background 0.14s ease;
}

.analysis-view-btn:hover {
  color: var(--text-pri);
  border-color: var(--border-md);
}

.analysis-view-btn.active {
  color: var(--text-pri);
  border-color: rgba(201, 127, 80, 0.35);
  background: rgba(201, 127, 80, 0.12);
}

.analysis-pane {
  display: none;
}

.analysis-pane.active {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
}

.analysis-type-card {
  cursor: pointer;
  user-select: none;
  flex-wrap: wrap;
  transition: border-color 0.16s ease, background 0.16s ease;
}

.analysis-type-card:hover {
  border-color: var(--border-md);
}

.analysis-type-card.active {
  border-color: rgba(201, 127, 80, 0.36);
  background: linear-gradient(180deg, rgba(201, 127, 80, 0.08) 0%, rgba(255, 255, 255, 0.02) 100%);
}

.analysis-type-detail {
  flex-basis: 100%;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transform: translateY(-6px);
  transition: max-height 0.26s ease, opacity 0.2s ease, transform 0.22s ease, margin-top 0.18s ease;
  margin-top: 0;
  border-top: 1px solid transparent;
}

.analysis-type-detail.open {
  max-height: 380px;
  opacity: 1;
  transform: translateY(0);
  margin-top: 8px;
  padding-top: 8px;
  border-top-color: rgba(255, 255, 255, 0.12);
}

.analysis-type-detail-head {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-sec);
}

.analysis-type-detail-stat {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent);
  margin-top: 4px;
}

.analysis-type-detail-label {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  margin-top: 8px;
}

.analysis-type-detail-code {
  margin-top: 4px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.25);
  color: var(--text-pri);
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 7px 8px;
  white-space: pre-wrap;
  word-break: break-word;
}

.analysis-type-detail-math {
  margin-top: 4px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.25);
  color: var(--text-pri);
  padding: 8px 10px;
  overflow-x: auto;
}

.analysis-type-detail-math .katex-display {
  margin: 0;
}

.analysis-type-detail-note {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-sec);
  line-height: 1.45;
}

.analysis-graph-controls {
  display: grid;
  grid-template-columns: repeat(3, minmax(140px, 1fr));
  gap: 8px;
}

.analysis-select {
  margin-bottom: 0;
  padding: 10px 12px;
  font-size: var(--fs-xs);
  letter-spacing: 0.05em;
}

.analysis-graph-input-row {
  grid-column: 1 / -1;
}

.analysis-graph-controls .hint-row {
  grid-column: 1 / -1;
  margin-top: 0;
  align-items: center;
  gap: 12px;
}

.analysis-graph-controls .hint-row span {
  white-space: nowrap;
}

.analysis-graph-input-row .word-input {
  margin-bottom: 0;
  font-size: var(--fs-xs);
  padding: 10px 12px;
}

.analysis-graph-input-row .btn-reset {
  min-width: 0;
  padding: 10px 12px;
}

.analysis-graph-wrap {
  margin-top: 8px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.03) 0%, rgba(255, 255, 255, 0.01) 100%);
  min-height: 232px;
  position: relative;
  overflow: hidden;
}

.analysis-graph-svg {
  width: 100%;
  height: 232px;
  display: block;
}

.analysis-graph-empty {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--text-sec);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: rgba(17, 17, 17, 0.65);
}

.analysis-graph-help {
  margin-top: 0;
}

.analysis-graph-wrap.has-data .analysis-graph-empty {
  display: none;
}

.analysis-graph-summary {
  margin-top: 6px;
}

.analysis-graph-deck {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  margin-top: 6px;
}

.analysis-mini-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.analysis-mini-head {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-sec);
}

.analysis-mini-value {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-pri);
}

.analysis-mini-svg {
  width: 100%;
  height: 72px;
  display: block;
}

.analysis-grid-line {
  stroke: rgba(255, 255, 255, 0.1);
  stroke-width: 1;
  shape-rendering: crispEdges;
}

.analysis-grid-label {
  fill: rgba(255, 255, 255, 0.48);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.02em;
}

.analysis-trend-area {
  fill: rgba(108, 169, 101, 0.16);
}

.analysis-trend-line {
  fill: none;
  stroke: var(--clr-green);
  stroke-width: 2.2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.analysis-trend-dot {
  fill: var(--clr-green);
  stroke: #101010;
  stroke-width: 1;
}

.analysis-trend-bar {
  fill: rgba(201, 127, 80, 0.72);
}

.analysis-trend-bar.time {
  fill: rgba(201, 127, 80, 0.72);
}

.analysis-trend-bar.mistake {
  fill: rgba(205, 92, 92, 0.74);
}

.analysis-trend-line.time {
  stroke: var(--accent);
}

.analysis-trend-area.time {
  fill: rgba(201, 127, 80, 0.17);
}

.analysis-trend-dot.time {
  fill: var(--accent);
}

.analysis-trend-line.mistake {
  stroke: var(--clr-red);
}

.analysis-trend-area.mistake {
  fill: rgba(205, 92, 92, 0.18);
}

.analysis-trend-dot.mistake {
  fill: var(--clr-red);
}

@media (max-width: 900px) {
  .main {
    height: auto;
    overflow: visible;
    padding: 68px 10px 60px;
  }

  .solver-layout {
    flex-direction: column;
    height: auto;
  }

  .left-panel {
    flex: none;
    width: 100%;
  }

  .right-panel {
    overflow-y: visible;
  }

  .history-list {
    overflow-y: visible;
  }

  .header {
    padding: 14px 12px;
    gap: 8px;
  }

  .header-sub {
    display: none;
  }

  .zen-main {
    padding-top: 74px;
  }

  .pz-layout {
    flex-direction: column;
    gap: 12px;
  }

  .zen-layout {
    flex-direction: column;
    gap: 12px;
  }

  .idx-layout {
    flex-direction: column;
    gap: 12px;
  }

  .pz-settings-side {
    position: static;
    width: 100%;
    min-width: 0;
    max-width: none;
    max-height: none;
    overflow: visible;
  }

  .zen-settings-side,
  .idx-settings-side {
    position: static;
    width: 100%;
    min-width: 0;
    max-width: none;
    max-height: none;
    overflow: visible;
  }

  .zen-expression-shell {
    min-height: clamp(280px, 58vh, 500px);
    padding: 14px 8px;
  }

  .zen-derivative {
    font-size: clamp(26px, 8vw, 72px);
  }

  .pz-key-row .btn-analyze,
  .pz-key-row .btn-reset {
    min-width: 100%;
  }

  .analysis-side {
    flex: none;
    width: 100%;
  }

  .analysis-list {
    max-height: none;
  }

  #anTypeBreakdown.analysis-list {
    min-height: 0;
    max-height: none;
  }

  #anRecent.analysis-list {
    min-height: 0;
    max-height: none;
  }

  .analysis-graph-controls {
    grid-template-columns: 1fr;
  }

  .analysis-graph-wrap {
    min-height: 220px;
  }

  .analysis-view-menu {
    flex-wrap: wrap;
  }

  .analysis-view-btn {
    min-width: 108px;
  }

  .analysis-graph-controls .hint-row {
    justify-content: flex-start;
    flex-wrap: wrap;
    gap: 6px 12px;
  }

  .analysis-graph-controls .hint-row span {
    white-space: normal;
  }

  .analysis-graph-deck {
    grid-template-columns: 1fr;
  }
}