:root {
  --bg-top: #cdb07a;
  --bg-bottom: #8b6736;
  --surface: rgba(239, 229, 198, 0.94);
  --surface-soft: #efe0b6;
  --surface-strong: #f7ebc9;
  --surface-border: rgba(121, 88, 31, 0.9);
  --surface-border-strong: #ca9b3a;
  --text: #3f2e16;
  --muted: #6a5530;
  --heading: #5a3f18;
  --subheading: #6f5727;
  --button-text: #2c200d;
  --button-bg: linear-gradient(180deg, #e2c46e 0%, #b7862c 100%);
  --button-bg-hover: linear-gradient(180deg, #edcf79 0%, #c49233 100%);
  --button-shadow: 0 9px 20px rgba(78, 53, 14, 0.18);
  --button-shadow-hover: 0 12px 24px rgba(78, 53, 14, 0.24);
  --theme-button-bg: linear-gradient(180deg, #f4e8c4 0%, #d0ae66 100%);
  --tree-bg: linear-gradient(180deg, #f1e5c4 0%, #d4bc89 100%);
  --code-bg: linear-gradient(180deg, #24314b 0%, #182236 100%);
  --code-text: #f4e1a1;
  --code-placeholder: #c7b27f;
  --code-border: #81642d;
  --output-bg: linear-gradient(180deg, rgba(39, 52, 79, 0.96), rgba(24, 33, 51, 0.98));
  --output-text: #f2deab;
  --panel-shadow: 0 16px 34px rgba(52, 34, 11, 0.22);
  --panel-inset: inset 0 1px 0 rgba(255, 250, 233, 0.42);
  --focus-ring: rgba(202, 155, 58, 0.26);
  --moon-bg: linear-gradient(180deg, #ffe37c 0%, #e2b447 58%, #a87718 100%);
  --moon-cutout: #efe4c2;
  --moon-shadow:
    inset -7px -7px 0 rgba(255, 248, 214, 0.4),
    0 12px 22px rgba(113, 81, 21, 0.3);
  --node-border: #8a6425;
  --node-bg: #f7ebc8;
  --node-highlight-border: #ca9b3a;
  --node-highlight-bg: #fff3c7;
  --node-text: #4e3919;
  --edge-color: #8c6c34;
  --font-ui: Tahoma, Verdana, sans-serif;
  --font-display: Georgia, "Palatino Linotype", serif;
  --font-code: "Cascadia Code", Consolas, monospace;
}

:root[data-theme="dark"] {
  --bg-top: #10172a;
  --bg-bottom: #08101c;
  --surface: rgba(17, 26, 45, 0.94);
  --surface-soft: #1b2944;
  --surface-strong: #223455;
  --surface-border: rgba(129, 98, 42, 0.95);
  --surface-border-strong: #d2a64a;
  --text: #efe4c0;
  --muted: #ccb98c;
  --heading: #f2db92;
  --subheading: #ddc171;
  --button-text: #32240d;
  --button-bg: linear-gradient(180deg, #e2c46e 0%, #b7862c 100%);
  --button-bg-hover: linear-gradient(180deg, #f0d57f 0%, #ca9939 100%);
  --button-shadow: 0 12px 24px rgba(0, 0, 0, 0.28);
  --button-shadow-hover: 0 14px 26px rgba(0, 0, 0, 0.38);
  --theme-button-bg: linear-gradient(180deg, #f5e2a9 0%, #cf9f35 100%);
  --tree-bg: linear-gradient(180deg, #18243e 0%, #0c1527 100%);
  --code-bg: #050507;
  --code-text: #f4a9c4;
  --code-placeholder: #9d6b86;
  --code-border: #8a6c33;
  --output-bg: linear-gradient(180deg, #16213a 0%, #0d1527 100%);
  --output-text: #f2deaa;
  --panel-shadow: 0 16px 34px rgba(0, 0, 0, 0.4);
  --panel-inset: inset 0 1px 0 rgba(255, 246, 220, 0.08);
  --focus-ring: rgba(210, 166, 74, 0.32);
  --moon-bg: linear-gradient(180deg, #ffe790 0%, #f0c54d 55%, #bb8418 100%);
  --moon-cutout: #15203a;
  --moon-shadow:
    inset -7px -7px 0 rgba(255, 248, 214, 0.22),
    0 12px 24px rgba(0, 0, 0, 0.36);
  --node-border: #cda44a;
  --node-bg: #1e2b48;
  --node-highlight-border: #f0d27b;
  --node-highlight-bg: #26375b;
  --node-text: #f7ecc8;
  --edge-color: #c9a453;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: var(--font-ui);
  background: linear-gradient(180deg, var(--bg-top) 0%, var(--bg-bottom) 100%);
}

.app-shell {
  width: min(1180px, calc(100% - 28px));
  margin: 24px auto;
}

.topbar,
.panel {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  box-shadow: var(--panel-shadow), var(--panel-inset);
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 18px;
  padding: 22px 24px;
  border-radius: 18px;
}

.brand-block,
.actions,
.page-switcher,
.keyword-list {
  display: flex;
}

.brand-block {
  align-items: center;
  gap: 16px;
}

.actions {
  gap: 10px;
}

.page-switcher,
.docs-layout,
.keyword-list {
  gap: 16px;
}

.moon-logo {
  position: relative;
  width: 54px;
  height: 54px;
  flex: 0 0 auto;
  border-radius: 50%;
  border: 2px solid var(--surface-border-strong);
  background: var(--moon-bg);
  box-shadow: var(--moon-shadow);
}

.moon-logo::after {
  content: "";
  position: absolute;
  inset: 7px auto auto 17px;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--moon-cutout);
}

.topbar h1,
.panel-heading h2,
.output-panel h2,
.spell-card h3 {
  font-family: var(--font-display);
}

.topbar h1 {
  margin: 0 0 10px;
  color: var(--heading);
  font-size: 2rem;
  letter-spacing: 0.03em;
  text-shadow: 0 1px 0 rgba(255, 248, 222, 0.2);
}

.panel-heading h2,
.output-panel h2 {
  margin: 0;
  color: var(--subheading);
  font-size: 1.1rem;
}

.topbar p,
.panel-heading p,
.spell-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

.topbar p {
  max-width: 760px;
}

.panel-heading p {
  margin-top: 8px;
}

button {
  padding: 11px 16px;
  border: 1px solid var(--surface-border-strong);
  border-radius: 12px;
  background: var(--button-bg);
  color: var(--button-text);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  box-shadow: var(--button-shadow);
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

button:hover {
  transform: translateY(-1px);
  box-shadow: var(--button-shadow-hover);
  background: var(--button-bg-hover);
}

button:focus-visible {
  outline: 2px solid var(--surface-border-strong);
  outline-offset: 2px;
}

#theme-toggle {
  background: var(--theme-button-bg);
  color: var(--heading);
}

.page-switcher {
  margin-top: 16px;
}

.tab-button {
  min-width: 120px;
  background: var(--surface-soft);
  color: var(--heading);
  box-shadow: none;
}

.tab-button:hover {
  background: var(--surface-strong);
  box-shadow: var(--button-shadow);
}

.tab-button.is-active {
  background: var(--button-bg);
  color: var(--button-text);
  box-shadow: var(--button-shadow);
}

.tab-button.is-active:hover {
  background: var(--button-bg-hover);
}

.page-view[hidden] {
  display: none !important;
}

.workspace {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 16px;
  margin-top: 16px;
}

.panel {
  padding: 18px;
  border-radius: 16px;
}

#tree,
.spell-card,
#coding-space,
.status-card,
#output-log {
  border-radius: 12px;
}

#tree,
.spell-card,
#coding-space,
.status-card,
#output-log,
.fallback-node {
  border: 1px solid var(--surface-border);
}

#tree {
  height: 360px;
  margin-top: 14px;
  background: var(--tree-bg);
  overflow: hidden;
  box-shadow: inset 0 1px 0 rgba(255, 248, 214, 0.18);
}

#tree.fallback-map {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 12px;
  overflow: auto;
}

.fallback-node,
.spell-card,
.status-card {
  background: var(--surface-soft);
}

.fallback-node {
  width: 100%;
  text-align: left;
  box-shadow: none;
}

.spell-card,
.output-panel,
.status-row {
  margin-top: 14px;
}

.spell-card {
  padding: 14px;
}

.spell-card h3 {
  margin: 0 0 8px;
  color: var(--heading);
}

#coding-space,
#output-log {
  width: 100%;
  padding: 14px 16px;
  font-family: var(--font-code);
  line-height: 1.6;
}

#coding-space {
  min-height: 430px;
  resize: vertical;
  background: var(--code-bg);
  color: var(--code-text);
  border-color: var(--code-border);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
  font-size: 0.96rem;
}

#coding-space::placeholder {
  color: var(--code-placeholder);
}

#coding-space:focus {
  outline: 2px solid var(--focus-ring);
  border-color: var(--surface-border-strong);
}

.status-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.status-card {
  padding: 12px 14px;
  color: var(--muted);
}

#output-log {
  min-height: 150px;
  margin: 12px 0 0;
  background: var(--output-bg);
  color: var(--output-text);
  white-space: pre-wrap;
}

.docs-view {
  margin-top: 16px;
}

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

.docs-card {
  padding: 22px;
}

.docs-card h2,
.keyword-item h3 {
  margin: 0;
  color: var(--heading);
  font-family: var(--font-display);
}

.docs-card p,
.keyword-item p {
  margin: 12px 0 0;
  color: var(--muted);
  line-height: 1.7;
}

.keyword-list {
  flex-direction: column;
  margin-top: 16px;
}

.keyword-item {
  padding: 14px 16px;
  border: 1px solid var(--surface-border);
  border-radius: 16px;
  background: var(--surface-soft);
}

@media (max-width: 900px) {
  .topbar,
  .brand-block,
  .actions {
    flex-direction: column;
  }

  .workspace,
  .status-row,
  .docs-layout {
    grid-template-columns: 1fr;
  }

  .actions,
  .actions button {
    width: 100%;
  }

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

  .page-switcher {
    flex-wrap: wrap;
  }

  .tab-button {
    width: 100%;
  }
}