:root {
  color-scheme: light;
  --bg-base: #f7f1e8;
  --bg-glow: rgba(255, 255, 255, 0.75);
  --grid-dot: rgba(95, 72, 47, 0.12);
  --surface: rgba(255, 252, 247, 0.88);
  --surface-strong: #fffaf4;
  --surface-border: rgba(64, 42, 27, 0.12);
  --text-strong: #2a1f18;
  --text-soft: #786354;
  --shadow-soft: 0 18px 40px rgba(74, 47, 29, 0.08);
  --shadow-selected: 0 0 0 3px rgba(219, 126, 76, 0.22);
  --root-color: #2c2421;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: "Avenir Next", "Hiragino Sans", "Yu Gothic", sans-serif;
  color: var(--text-strong);
  background:
    radial-gradient(circle at top left, rgba(255, 239, 219, 0.92), transparent 30%),
    radial-gradient(circle at bottom right, rgba(252, 230, 214, 0.82), transparent 28%),
    var(--bg-base);
}

button,
input,
textarea {
  font: inherit;
}

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto auto 1fr;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  padding: 18px 22px 14px;
  position: relative;
  z-index: 20;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-mark {
  width: 52px;
  height: 52px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 16px;
  background: rgba(255, 252, 247, 0.85);
  border: 1px solid rgba(64, 42, 27, 0.08);
  box-shadow: 0 14px 28px rgba(73, 49, 31, 0.08);
}

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

.brand-copy {
  display: grid;
  gap: 2px;
}

.brand h1 {
  margin: 0;
  font-size: 1.55rem;
  font-weight: 600;
  letter-spacing: -0.03em;
}

.toolbar {
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  gap: 4px;
  max-width: 100%;
  overflow: visible;
  padding: 8px 10px;
  border-radius: 18px;
  background: rgba(255, 252, 247, 0.74);
  border: 1px solid rgba(64, 42, 27, 0.08);
  box-shadow: 0 12px 24px rgba(56, 39, 26, 0.06);
}

.menu-group {
  position: relative;
  flex: 0 0 auto;
}

.menu-trigger {
  display: block;
  list-style: none;
  border: 0;
  background: transparent;
  font: inherit;
  cursor: pointer;
  user-select: none;
  padding: 9px 12px;
  border-radius: 10px;
  color: var(--text-strong);
  transition: background-color 140ms ease;
}

.menu-trigger::-webkit-details-marker {
  display: none;
}

.menu-trigger:hover,
.menu-group[open] .menu-trigger {
  background: rgba(255, 255, 255, 0.72);
}

.menu-panel {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  z-index: 20;
  min-width: 240px;
  display: grid;
  gap: 6px;
  padding: 10px;
  border-radius: 18px;
  border: 1px solid rgba(64, 42, 27, 0.08);
  background: rgba(255, 252, 247, 0.96);
  box-shadow: 0 20px 34px rgba(56, 39, 26, 0.12);
}

.menu-field {
  display: grid;
  gap: 8px;
  padding: 8px 10px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.76);
  border: 1px solid rgba(64, 42, 27, 0.05);
}

.menu-field span {
  font-size: 0.86rem;
  color: var(--text-soft);
}

.menu-item,
.menu-link {
  display: block;
  width: 100%;
  border: 0;
  background: transparent;
  color: var(--text-strong);
  padding: 10px 12px;
  border-radius: 12px;
  text-align: left;
  cursor: pointer;
  text-decoration: none;
}

.menu-item:hover,
.menu-link:hover,
.menu-item-label:hover {
  background: rgba(255, 255, 255, 0.78);
}

.menu-item-label {
  position: relative;
  overflow: hidden;
  cursor: pointer;
}

.menu-item:disabled {
  opacity: 0.48;
  cursor: default;
}

.toolbar-select-wrap {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid var(--surface-border);
  background: var(--surface);
  box-shadow: 0 10px 24px rgba(56, 39, 26, 0.06);
}

.toolbar-select-wrap span {
  font-size: 0.9rem;
  color: var(--text-soft);
}

.toolbar-select {
  border: 0;
  background: transparent;
  color: var(--text-strong);
  min-width: 180px;
  outline: none;
}

.toolbar-button {
  border: 1px solid var(--surface-border);
  background: var(--surface);
  color: var(--text-strong);
  padding: 10px 14px;
  border-radius: 999px;
  cursor: pointer;
  backdrop-filter: blur(18px);
  box-shadow: 0 10px 24px rgba(56, 39, 26, 0.06);
  transition:
    transform 160ms ease,
    background-color 160ms ease,
    box-shadow 160ms ease;
}

.toolbar-button:hover {
  transform: translateY(-1px);
  background: var(--surface-strong);
  box-shadow: 0 14px 26px rgba(56, 39, 26, 0.09);
}

.file-button {
  position: relative;
  overflow: hidden;
}

.hintbar {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 16px;
  padding: 0 22px 16px;
  color: var(--text-soft);
  font-size: 0.92rem;
}

.status-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.save-indicator {
  padding: 7px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(64, 42, 27, 0.08);
  color: var(--text-soft);
}

.save-indicator.is-dirty {
  color: #985a33;
  background: rgba(255, 242, 232, 0.92);
}

.drive-indicator.is-error {
  color: #8f3e3e;
  background: rgba(255, 236, 236, 0.96);
}

.ai-indicator.is-ready {
  color: #2f6f63;
  background: rgba(234, 248, 244, 0.96);
}

.ai-indicator.is-error {
  color: #8f3e3e;
  background: rgba(255, 236, 236, 0.96);
}

.toolbar-button:disabled {
  cursor: default;
  opacity: 0.5;
  transform: none;
  box-shadow: 0 10px 24px rgba(56, 39, 26, 0.04);
}

.workspace {
  padding: 0 18px 18px;
}

.stage-shell {
  position: relative;
  min-height: calc(100vh - 132px);
  overflow: hidden;
  border-radius: 28px;
  border: 1px solid rgba(92, 66, 43, 0.08);
  background:
    radial-gradient(circle, var(--grid-dot) 1.1px, transparent 1.2px) 0 0 / 28px 28px,
    linear-gradient(180deg, rgba(255, 255, 255, 0.62), rgba(255, 253, 249, 0.82));
  box-shadow: var(--shadow-soft);
  touch-action: none;
}

.connections-layer,
.nodes-layer {
  position: absolute;
  inset: 0;
  transform-origin: 0 0;
}

.connections-layer {
  overflow: visible;
}

.nodes-layer {
  pointer-events: none;
}

.node-shell {
  position: absolute;
  left: 0;
  top: 0;
  pointer-events: auto;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  --branch-color: #db7e4c;
}

.node-shell.side-left {
  flex-direction: row-reverse;
}

.node-card {
  min-width: 132px;
  max-width: 228px;
  padding: 12px 16px;
  border-radius: 20px;
  background: rgba(255, 252, 248, 0.96);
  border: 1px solid color-mix(in srgb, var(--branch-color) 26%, white);
  box-shadow: 0 16px 26px rgba(73, 49, 31, 0.08);
}

.node-shell.is-root .node-card {
  min-width: 180px;
  max-width: 260px;
  padding: 16px 20px;
  border-radius: 24px;
  background: rgba(44, 36, 33, 0.96);
  border-color: rgba(44, 36, 33, 0.82);
  box-shadow: 0 22px 44px rgba(44, 36, 33, 0.18);
}

.node-shell.is-selected .node-card {
  box-shadow: var(--shadow-selected), 0 18px 30px rgba(73, 49, 31, 0.1);
}

.node-body {
  outline: none;
  border: 0;
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.45;
  font-size: 0.98rem;
  min-height: 1.45em;
}

.node-shell.is-root .node-body {
  color: #fff8f4;
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.node-body[data-empty="true"]::before {
  content: attr(data-placeholder);
  color: rgba(120, 99, 84, 0.7);
}

.node-shell.is-root .node-body[data-empty="true"]::before {
  color: rgba(255, 245, 236, 0.55);
}

.node-toggle {
  width: 28px;
  height: 28px;
  border: 0;
  border-radius: 999px;
  background: color-mix(in srgb, var(--branch-color) 18%, white);
  color: color-mix(in srgb, var(--branch-color) 84%, black);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 10px 18px rgba(61, 40, 25, 0.08);
}

.node-toggle[hidden] {
  display: none;
}

.node-grip {
  width: 20px;
  height: 42px;
  border: 0;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 10px 18px rgba(61, 40, 25, 0.08);
  position: relative;
  cursor: grab;
  opacity: 0.38;
  transition: opacity 140ms ease, background-color 140ms ease;
}

.node-grip::before {
  content: "";
  position: absolute;
  inset: 0;
  margin: auto;
  width: 4px;
  height: 4px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--branch-color) 78%, black);
  box-shadow:
    0 -10px 0 color-mix(in srgb, var(--branch-color) 78%, black),
    0 10px 0 color-mix(in srgb, var(--branch-color) 78%, black),
    6px -10px 0 color-mix(in srgb, var(--branch-color) 78%, black),
    6px 0 0 color-mix(in srgb, var(--branch-color) 78%, black),
    6px 10px 0 color-mix(in srgb, var(--branch-color) 78%, black);
}

.node-shell:hover .node-grip,
.node-shell.is-selected .node-grip {
  opacity: 1;
}

.node-grip:hover {
  background: rgba(255, 255, 255, 0.92);
}

.node-grip:active {
  cursor: grabbing;
}

.workspace-hud {
  position: absolute;
  left: 20px;
  right: 20px;
  bottom: 20px;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 16px;
  pointer-events: none;
}

.hud-card {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  padding: 12px 14px;
  border-radius: 18px;
  background: rgba(255, 252, 247, 0.86);
  border: 1px solid rgba(64, 42, 27, 0.08);
  color: var(--text-strong);
  backdrop-filter: blur(16px);
  box-shadow: 0 12px 28px rgba(73, 49, 31, 0.08);
}

.hud-card.muted {
  color: var(--text-soft);
}

.hud-card strong {
  font-size: 0.92rem;
}

.hud-card span {
  font-size: 0.88rem;
}

path.connection {
  fill: none;
  stroke-linecap: round;
  stroke-width: 3;
  opacity: 0.8;
}

.overlay-panel {
  position: fixed;
  inset: 0;
  background: rgba(42, 31, 24, 0.24);
  backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 30;
}

.overlay-panel[hidden] {
  display: none !important;
}

.overlay-card {
  width: min(760px, 100%);
  max-height: min(80vh, 760px);
  overflow: auto;
  border-radius: 28px;
  background: rgba(255, 252, 247, 0.96);
  border: 1px solid rgba(64, 42, 27, 0.1);
  box-shadow: 0 24px 50px rgba(42, 31, 24, 0.18);
  padding: 22px;
}

.overlay-card-wide {
  width: min(900px, 100%);
}

.overlay-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
}

.overlay-kicker {
  margin: 0 0 4px;
  color: var(--text-soft);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.overlay-header h2 {
  margin: 0;
  font-size: 1.2rem;
}

.overlay-summary {
  margin: 16px 0 0;
  color: var(--text-soft);
}

.overlay-context-panel {
  margin-top: 16px;
  display: grid;
  gap: 10px;
  padding: 14px 16px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(64, 42, 27, 0.08);
}

.overlay-context-row {
  display: grid;
  gap: 4px;
}

.overlay-context-row strong {
  color: var(--text-soft);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.overlay-context-row span {
  color: var(--text-strong);
  font-size: 1rem;
  line-height: 1.5;
}

.overlay-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.overlay-list {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.overlay-row {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  border-radius: 18px;
  border: 1px solid rgba(64, 42, 27, 0.08);
  background: rgba(255, 255, 255, 0.8);
}

.overlay-row input {
  width: 18px;
  height: 18px;
}

.overlay-row.is-current {
  border-color: rgba(219, 126, 76, 0.34);
  background: rgba(255, 245, 238, 0.9);
}

.overlay-row-copy {
  display: grid;
  gap: 4px;
}

.overlay-row-title {
  font-weight: 600;
}

.overlay-row-meta {
  color: var(--text-soft);
  font-size: 0.88rem;
}

.overlay-field {
  margin-top: 16px;
}

.overlay-check {
  margin-top: 16px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text-soft);
}

.overlay-check input {
  width: 18px;
  height: 18px;
}

.overlay-textarea {
  width: 100%;
  resize: vertical;
  min-height: 96px;
  border: 1px solid rgba(64, 42, 27, 0.1);
  border-radius: 16px;
  padding: 12px 14px;
  background: rgba(255, 255, 255, 0.86);
  color: var(--text-strong);
}

.overlay-textarea:focus {
  outline: 2px solid rgba(219, 126, 76, 0.2);
  border-color: rgba(219, 126, 76, 0.3);
}

.overlay-input {
  width: 100%;
  border: 1px solid rgba(64, 42, 27, 0.1);
  border-radius: 16px;
  padding: 12px 14px;
  background: rgba(255, 255, 255, 0.86);
  color: var(--text-strong);
}

.overlay-input:focus {
  outline: 2px solid rgba(219, 126, 76, 0.2);
  border-color: rgba(219, 126, 76, 0.3);
}

.overlay-status {
  min-height: 1.4em;
}

.overlay-status.is-error {
  color: #8f3e3e;
}

.overlay-empty {
  padding: 18px 20px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px dashed rgba(64, 42, 27, 0.12);
  color: var(--text-soft);
}

.overlay-note {
  margin-top: 14px;
  padding: 14px 16px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(64, 42, 27, 0.08);
  color: var(--text-soft);
  line-height: 1.6;
}

.overlay-sources {
  margin-top: 18px;
  padding: 16px;
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.76);
  border: 1px solid rgba(64, 42, 27, 0.08);
  display: grid;
  gap: 12px;
}

.overlay-sources[hidden] {
  display: none;
}

.overlay-sources-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
}

.overlay-sources-header strong {
  font-size: 0.96rem;
}

.overlay-sources-header span {
  color: var(--text-soft);
  font-size: 0.88rem;
}

.overlay-source-list {
  display: grid;
  gap: 10px;
}

.overlay-source-item {
  display: grid;
  gap: 4px;
  padding: 12px 14px;
  border-radius: 16px;
  background: rgba(255, 247, 240, 0.92);
  border: 1px solid rgba(219, 126, 76, 0.14);
}

.overlay-source-item a {
  color: #774c35;
  text-decoration: none;
  font-weight: 600;
}

.overlay-source-item a:hover {
  text-decoration: underline;
}

.overlay-source-item span {
  color: var(--text-soft);
  font-size: 0.84rem;
  word-break: break-all;
}

.ai-children {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 4px;
}

.ai-child-chip {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(255, 247, 240, 0.92);
  border: 1px solid rgba(219, 126, 76, 0.16);
  color: #8a6248;
  font-size: 0.8rem;
}

body.help-page {
  min-height: 100vh;
  padding: 28px 18px;
}

.help-shell {
  width: min(920px, 100%);
  margin: 0 auto;
}

.help-card {
  border-radius: 30px;
  padding: 28px;
  background: rgba(255, 252, 247, 0.9);
  border: 1px solid rgba(64, 42, 27, 0.08);
  box-shadow: 0 24px 50px rgba(56, 39, 26, 0.1);
}

.help-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 18px;
  margin-bottom: 24px;
}

.help-title {
  display: grid;
  gap: 8px;
}

.help-title h1 {
  margin: 0;
  font-size: 1.8rem;
  letter-spacing: -0.03em;
}

.help-title p {
  margin: 0;
  color: var(--text-soft);
  line-height: 1.6;
}

.help-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 16px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(64, 42, 27, 0.08);
  color: var(--text-strong);
  text-decoration: none;
  white-space: nowrap;
}

.help-grid {
  display: grid;
  gap: 16px;
}

.help-section {
  padding: 18px 20px;
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(64, 42, 27, 0.06);
}

.help-section h2 {
  margin: 0 0 12px;
  font-size: 1.08rem;
}

.help-section p {
  margin: 0;
  color: var(--text-soft);
  line-height: 1.65;
}

.help-list,
.shortcut-list {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 8px;
  color: var(--text-soft);
  line-height: 1.65;
}

.shortcut-list strong {
  color: var(--text-strong);
}

@media (max-width: 900px) {
  .topbar,
  .hintbar,
  .workspace {
    padding-left: 14px;
    padding-right: 14px;
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .brand {
    align-items: flex-start;
  }

  .toolbar {
    width: 100%;
    flex-wrap: wrap;
  }

  .toolbar-select {
    min-width: 140px;
  }

  .hintbar {
    justify-content: flex-start;
  }

  .status-group {
    flex-wrap: wrap;
  }

  .stage-shell {
    min-height: calc(100vh - 208px);
  }

  .workspace-hud {
    flex-direction: column;
    align-items: stretch;
  }

  .overlay-header {
    flex-direction: column;
  }

  .help-card {
    padding: 22px;
  }

  .help-header {
    flex-direction: column;
  }
}