:root {
  --asagi: #33a6b8;
  --ai: #0d5661;
  --shinbashi: #0089a7;
  --tetsuonando: #255359;
  --kamenozoki: #a5dee4;
  --yamabuki: #ffb11b;
  --nanohana: #f7d94c;
  --tamarokoshi: #e8b647;
  --kohbai: #e16b8c;
  --momo: #f596aa;
  --karakurenai: #d0104c;
  --accent: #2cb1bc;
  --accent-strong: #ff6b6b;
  --accent-soft: #f6c453;
  --accent-rgb: 44, 177, 188;
  --accent-strong-rgb: 255, 107, 107;
  --accent-soft-rgb: 246, 196, 83;
  --shadow: rgba(0, 0, 0, 0.08);
  --shadow-strong: rgba(0, 0, 0, 0.16);
  --glow: rgba(51, 166, 184, 0.04);
  --mono: "JetBrains Mono", "SFMono-Regular", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-family: "PingFang SC", "PingFang TC", "PingFang HK", "PingFang", "Helvetica Neue", "SF Pro Text", "SF Pro Display", system-ui, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
}

.light-theme {
  --bg: #f1f3f6;
  --bg-alt: #fbfcfe;
  --text: #1c1c1e;
  --panel: #ffffff;
  --panel-border: rgba(15, 23, 42, 0.08);
  --muted: #6b6b73;
  --button-bg: #ffffff;
  --button-border: rgba(15, 23, 42, 0.12);
  --button-text: #1c1c1e;
  --button-hover: rgba(15, 23, 42, 0.06);
  --canvas-border: rgba(15, 23, 42, 0.12);
  --divider: rgba(15, 23, 42, 0.08);
  --overlay-bg: rgba(255, 255, 255, 0.78);
  --overlay-border: rgba(15, 23, 42, 0.12);
  --overlay-shadow: rgba(15, 23, 42, 0.1);
  --panel-shadow: 0 10px 24px rgba(15, 23, 42, 0.08), 0 1px 3px rgba(15, 23, 42, 0.05);
  --panel-inset: inset 0 1px 0 rgba(255, 255, 255, 0.9);
}

.dark-theme {
  --bg: #0f1114;
  --bg-alt: #171b20;
  --text: #f2f2f7;
  --panel: #14171b;
  --panel-border: rgba(255, 255, 255, 0.08);
  --muted: #a1a1aa;
  --button-bg: #14171b;
  --button-border: rgba(255, 255, 255, 0.12);
  --button-text: #f2f2f7;
  --button-hover: rgba(255, 255, 255, 0.08);
  --canvas-border: rgba(255, 255, 255, 0.12);
  --divider: rgba(255, 255, 255, 0.1);
  --overlay-bg: rgba(20, 23, 28, 0.78);
  --overlay-border: rgba(255, 255, 255, 0.16);
  --overlay-shadow: rgba(0, 0, 0, 0.4);
  --panel-shadow: 0 14px 28px rgba(0, 0, 0, 0.45), 0 2px 6px rgba(0, 0, 0, 0.3);
  --panel-inset: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

.hidden {
  display: none !important;
}

.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: linear-gradient(180deg, var(--bg-alt), var(--bg));
  position: relative;
  overflow: hidden;
}

.app::before {
  content: "";
  position: absolute;
  inset: -10% -10% auto -10%;
  height: 50%;
  background: radial-gradient(circle at 30% 35%, var(--glow), transparent 70%);
  pointer-events: none;
  opacity: 0.06;
}

.app > * {
  position: relative;
  z-index: 1;
}

.topbar {
  height: 52px;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--divider);
  background: var(--panel);
  font-weight: 600;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.topbar-title {
  font-size: 16px;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.main-layout {
  flex: 1;
  min-height: 0;
  display: flex;
  gap: 20px;
  padding: 20px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  min-height: 0;
  overflow: auto;
  box-shadow: var(--panel-shadow);
  position: relative;
}

.panel::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 12px;
  box-shadow: var(--panel-inset);
  pointer-events: none;
}

.left-panel,
.right-panel {
  width: 260px;
}

.canvas-area {
  flex: 1;
  min-width: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.14), 0 2px 6px rgba(0, 0, 0, 0.08);
  position: relative;
  overflow: hidden;
}

.canvas-area::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.18), transparent 55%);
  pointer-events: none;
  opacity: 0.3;
}

.viz-stage {
  width: 100%;
  height: 100%;
  min-height: 320px;
  position: relative;
}

canvas.fade-reset {
  animation: resetFade 360ms ease-in-out;
  will-change: opacity;
}

@keyframes resetFade {
  0% {
    opacity: 1;
  }
  50% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}

.canvas-overlay {
  position: absolute;
  padding: 8px 12px;
  border-radius: 10px;
  background: var(--overlay-bg);
  border: 1px solid var(--overlay-border);
  box-shadow: 0 4px 12px var(--overlay-shadow);
  backdrop-filter: blur(12px) saturate(160%);
  -webkit-backdrop-filter: blur(12px) saturate(160%);
  font-family: var(--mono);
  font-size: 11px;
  line-height: 1.3;
  pointer-events: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-width: 70%;
}

.overlay-left {
  top: 16px;
  left: 16px;
  font-size: 12px;
}

.overlay-right {
  top: 16px;
  right: 16px;
  font-size: 11px;
}

.overlay-title {
  font-family: inherit;
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 600;
}

.overlay-line {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.overlay-line.inline {
  flex-direction: row;
  align-items: center;
  gap: 8px;
}

.equation-line {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.equation-line.compact {
  font-size: 10px;
}

.overlay-label,
.equation-label {
  color: var(--muted);
  font-weight: 600;
}

.equation-operator {
  color: var(--muted);
  font-weight: 600;
}

.overlay-matrix {
  padding: 3px 8px;
}

.overlay-matrix-display {
  gap: 3px 5px;
}

.overlay-cell {
  min-width: 32px;
  padding: 3px 5px;
  font-size: 11px;
  border-radius: 6px;
}

.vector-column {
  grid-template-columns: 1fr;
}

canvas {
  width: 100%;
  height: 100%;
  display: block;
  border-radius: 12px;
  background: var(--bg);
  border: 1px solid var(--canvas-border);
  touch-action: none;
}

.section {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

#composeActions {
  align-items: center;
}

.mode-selector {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: 10px;
  border: 1px solid var(--panel-border);
  background: var(--panel);
  font-size: 12px;
  color: var(--muted);
}

.mode-selector label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}

.mode-selector input[type="radio"] {
  accent-color: var(--accent);
}

.toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text);
}

.toggle input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
}

.matrix-card {
  padding: 16px;
  border-radius: 12px;
  border: 1px solid var(--panel-border);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.card-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.matrix-bracket {
  position: relative;
  padding: 8px 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--text);
}

.matrix-bracket::before,
.matrix-bracket::after {
  content: "";
  position: absolute;
  top: 6px;
  bottom: 6px;
  width: 8px;
  border-top: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
}

.matrix-bracket::before {
  left: 0;
  border-left: 2px solid currentColor;
}

.matrix-bracket::after {
  right: 0;
  border-right: 2px solid currentColor;
}

.matrix-input {
  display: grid;
  grid-template-columns: repeat(2, 56px);
  gap: 8px;
  justify-items: center;
}

.matrix-input input[type="number"] {
  width: 56px;
  height: 46px;
  padding: 4px;
  border-radius: 6px;
  border: 1px solid var(--panel-border);
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  text-align: center;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.matrix-input input[type="number"]:focus {
  outline: none;
  border-color: rgba(var(--accent-rgb), 0.7);
  box-shadow: 0 0 0 3px rgba(var(--accent-rgb), 0.2);
}

.card-actions {
  display: flex;
  gap: 8px;
  flex-wrap: nowrap;
  justify-content: center;
}

.vector-input {
  display: grid;
  grid-template-columns: 56px;
  gap: 8px;
  justify-content: start;
  justify-items: center;
}

.vector-input input[type="number"] {
  width: 56px;
  height: 46px;
  padding: 4px;
  border-radius: 6px;
  border: 1px solid var(--panel-border);
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  text-align: center;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.vector-input input[type="number"]:focus {
  outline: none;
  border-color: rgba(var(--accent-rgb), 0.7);
  box-shadow: 0 0 0 3px rgba(var(--accent-rgb), 0.2);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: 8px;
  border: 1px solid var(--button-border);
  background: var(--button-bg);
  color: var(--button-text);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.btn svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

.btn:hover {
  background: var(--button-hover);
}

.btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px rgba(var(--accent-rgb), 0.22);
}

.apply-btn {
  background: rgba(208, 16, 76, 0.12);
  border: 1px solid rgba(208, 16, 76, 0.4);
  font-weight: 600;
  min-width: 96px;
  text-align: center;
}

.apply-btn:hover {
  background: rgba(208, 16, 76, 0.2);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.icon-btn {
  padding: 6px;
  width: 32px;
  height: 32px;
  justify-content: center;
}

.right-panel h2 {
  margin: 0;
  font-size: 16px;
}

.hint {
  color: var(--muted);
  font-size: 12px;
}

.analysis-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.analysis-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  font-size: 13px;
  color: var(--muted);
}

.analysis-value {
  font-family: var(--mono);
  color: var(--text);
  font-weight: 600;
}

.det-positive {
  color: var(--asagi);
}

.det-negative {
  color: var(--karakurenai);
}

.det-zero {
  color: var(--muted);
}

.vector-controls {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}

.vector-controls input[type="number"] {
  width: 100%;
  height: 36px;
  padding: 4px;
  border-radius: 6px;
  border: 1px solid var(--panel-border);
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  text-align: center;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.vector-controls input[type="number"]:focus {
  outline: none;
  border-color: rgba(var(--accent-rgb), 0.7);
  box-shadow: 0 0 0 3px rgba(var(--accent-rgb), 0.2);
}

.matrix-input input[type="number"],
.vector-input input[type="number"],
.vector-controls input[type="number"] {
  caret-color: var(--accent);
}

.matrix-input input[type="number"]::selection,
.vector-input input[type="number"]::selection,
.vector-controls input[type="number"]::selection {
  background: rgba(var(--accent-rgb), 0.25);
  color: var(--text);
}

.vector-value {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--text);
}

.vector-display {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.vector-block {
  display: flex;
  align-items: center;
  gap: 8px;
}

.vector-label {
  font-size: 12px;
  color: var(--muted);
  min-width: 36px;
}

.vector-matrix {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  font-family: var(--mono);
}

.inverse-panel {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 12px;
  border-radius: 12px;
  border: 1px solid var(--panel-border);
}

.inverse-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.matrix-label {
  font-size: 12px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.inverse-det {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--muted);
}

.inverse-det-value {
  font-family: var(--mono);
  font-weight: 600;
  color: var(--text);
}

.matrix-display {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px 8px;
  font-family: var(--mono);
  justify-items: center;
}

.matrix-cell {
  min-width: 64px;
  padding: 6px 8px;
  border-radius: 8px;
  border: 1px solid var(--panel-border);
  background: var(--bg);
  font-size: 13px;
  font-weight: 600;
  text-align: center;
}

.inverse-notice,
.inverse-warning {
  font-size: 12px;
  font-weight: 600;
  color: var(--karakurenai);
  padding: 6px 8px;
  border-radius: 8px;
  border: 1px solid rgba(208, 16, 76, 0.4);
  background: rgba(208, 16, 76, 0.12);
}

.matrix-multiply {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  padding: 12px;
  border-radius: 12px;
  border: 1px solid var(--panel-border);
}

.matrix-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.matrix-title {
  font-size: 11px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.matrix-operator {
  font-size: 18px;
  font-weight: 600;
  color: var(--muted);
}

.highlight-update {
  animation: highlightFade 0.7s ease;
}

@keyframes highlightFade {
  0% {
    background-color: rgba(var(--accent-soft-rgb), 0.35);
  }
  100% {
    background-color: transparent;
  }
}

@media (max-width: 1000px) {
  .main-layout {
    flex-direction: column;
    padding: 16px;
    gap: 16px;
  }

  .left-panel,
  .right-panel {
    width: 100%;
  }

  .canvas-area {
    order: 1;
    min-height: 48vh;
  }

  .left-panel {
    order: 2;
  }

  .right-panel {
    order: 3;
  }
}

@media (max-width: 720px) {
  .topbar {
    height: auto;
    padding: 12px 16px;
    flex-wrap: wrap;
    gap: 10px;
  }

  .topbar-actions {
    flex-wrap: wrap;
    gap: 8px;
  }

  .main-layout {
    padding: 12px;
    gap: 12px;
  }

  .panel {
    padding: 12px;
    gap: 16px;
  }

  .canvas-overlay {
    max-width: 90%;
    font-size: 10px;
  }

  .overlay-left,
  .overlay-right {
    font-size: 10px;
  }

  .overlay-right {
    top: auto;
    bottom: 12px;
  }

  .matrix-input {
    grid-template-columns: repeat(2, 46px);
  }

  .matrix-input input[type="number"] {
    width: 46px;
    height: 42px;
    font-size: 14px;
  }

  .vector-input input[type="number"] {
    width: 46px;
    height: 42px;
    font-size: 14px;
  }

  .btn {
    padding: 8px 12px;
  }

  .analysis-row {
    flex-wrap: wrap;
  }
}

@media (max-width: 520px) {
  .topbar-title {
    font-size: 14px;
  }

  .mode-selector {
    flex-wrap: wrap;
  }

  .matrix-input {
    grid-template-columns: repeat(2, 42px);
    gap: 6px;
  }

  .matrix-input input[type="number"] {
    width: 42px;
    height: 38px;
    font-size: 13px;
  }

  .vector-input {
    grid-template-columns: 44px;
  }

  .vector-input input[type="number"] {
    width: 44px;
    height: 38px;
    font-size: 13px;
  }

  .matrix-cell {
    min-width: 52px;
  }

  .canvas-area {
    min-height: 46vh;
    padding: 12px;
  }
}