:root {
  --color-bg: #f6f7f4;
  --color-surface: #ffffff;
  --color-surface-muted: #edf1ee;
  --color-text: #18211d;
  --color-muted: #5d6b63;
  --color-border: #d9e0db;
  --color-accent: #147d90;
  --color-accent-soft: #e2f4f6;
  --color-warning: #a15c00;
  --color-highlight: #fff0a6;
  --color-danger: #8c1d18;
  --color-danger-soft: #fff1f0;
  --color-danger-border: #ffccc7;
  --color-code-bg: #111817;
  --color-code-text: #edf7f5;
  --space-page: 1.25rem;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
}

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

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

button {
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
  min-height: 2.4rem;
  padding: 0.45rem 0.65rem;
}

button:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

textarea {
  width: 100%;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  padding: 0.65rem;
  resize: vertical;
}

input,
select {
  width: 100%;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  min-height: 2.4rem;
  padding: 0.5rem 0.6rem;
}

.shell {
  display: grid;
  grid-template-columns: 19rem minmax(0, 1fr) 24rem;
  min-height: 100vh;
}

.sidebar,
.assistant-panel {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: auto;
  background: var(--color-surface);
}

.sidebar {
  border-right: 1px solid var(--color-border);
  padding: var(--space-page);
}

.assistant-panel {
  border-left: 1px solid var(--color-border);
  padding: var(--space-page);
}

.brand {
  margin-bottom: 1rem;
}

.brand strong {
  display: block;
}

.brand span,
small {
  color: var(--color-muted);
}

.doc-list {
  display: grid;
  gap: 0.2rem;
}

.doc-link {
  color: var(--color-text);
  display: block;
  font-size: 0.92rem;
  padding: 0.5rem 0.6rem;
}

.doc-link:hover,
.doc-link[aria-current="page"] {
  background: var(--color-accent-soft);
  color: var(--color-accent);
  text-decoration: none;
}

.content-wrap {
  min-width: 0;
  padding: 1.5rem;
}

.topbar {
  align-items: center;
  gap: 1rem;
  display: flex;
  justify-content: space-between;
  margin: 0 auto 1rem;
  max-width: 76rem;
}

.logout-form {
  align-items: center;
  display: flex;
  gap: 0.5rem;
  margin-left: auto;
}

.article {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  margin: 0 auto;
  max-width: 76rem;
  padding: 2rem;
}

.article :first-child {
  margin-top: 0;
}

.article h1,
.article h2,
.article h3 {
  line-height: 1.2;
}

.article h1 {
  font-size: 2rem;
}

.article h2 {
  border-top: 1px solid var(--color-border);
  font-size: 1.35rem;
  margin-top: 2rem;
  padding-top: 1.25rem;
}

.article h3 {
  font-size: 1.08rem;
  margin-top: 1.5rem;
}

.article table {
  border-collapse: collapse;
  display: block;
  overflow-x: auto;
  width: 100%;
}

.article th,
.article td {
  border: 1px solid var(--color-border);
  padding: 0.55rem 0.65rem;
  text-align: left;
  vertical-align: top;
}

.article th {
  background: var(--color-surface-muted);
}

.article code {
  background: var(--color-surface-muted);
  padding: 0.08rem 0.28rem;
}

.article pre {
  background: var(--color-code-bg);
  color: var(--color-code-text);
  overflow-x: auto;
  padding: 1rem;
}

.article pre code {
  background: transparent;
  color: inherit;
  padding: 0;
}

.doc-block {
  position: relative;
}

.doc-block.is-annotated {
  outline: 2px solid var(--color-accent-soft);
  outline-offset: 0.2rem;
}

.annotation-highlight {
  background: var(--color-highlight);
  box-decoration-break: clone;
  padding: 0.06rem 0.12rem;
}

.doc-block.is-annotated::after {
  color: var(--color-accent);
  content: "nota";
  font-size: 0.72rem;
  font-weight: 700;
  position: absolute;
  right: -0.2rem;
  top: -0.7rem;
}

.panel-section {
  border-bottom: 1px solid var(--color-border);
  padding: 0 0 1rem;
  margin-bottom: 1rem;
}

.panel-section h2 {
  font-size: 1rem;
  margin: 0;
}

.panel-title {
  align-items: center;
  display: flex;
  gap: 0.6rem;
  justify-content: space-between;
  margin: 0 0 0.75rem;
}

.panel-title button {
  min-height: 1.9rem;
  padding: 0.25rem 0.5rem;
}

.panel-title small {
  font-size: 0.78rem;
}

#selected-text {
  border-left: 3px solid var(--color-accent);
  color: var(--color-muted);
  margin: 0 0 0.75rem;
  max-height: 8rem;
  min-height: 3rem;
  overflow: auto;
  padding-left: 0.75rem;
  resize: vertical;
}

#selected-text.is-expanded {
  max-height: 65vh;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.55rem;
}

.assistant-answer {
  background: var(--color-surface-muted);
  min-height: 5rem;
  padding: 0.75rem;
}

.assistant-answer :first-child {
  margin-top: 0;
}

.assistant-answer :last-child {
  margin-bottom: 0;
}

.assistant-answer p,
.assistant-answer ul,
.assistant-answer ol,
.assistant-answer pre {
  margin: 0 0 0.75rem;
}

.assistant-answer ul,
.assistant-answer ol {
  padding-left: 1.35rem;
}

.assistant-answer li + li {
  margin-top: 0.25rem;
}

.assistant-answer code {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 0.08rem 0.25rem;
}

.assistant-answer pre {
  background: var(--color-code-bg);
  color: var(--color-code-text);
  overflow-x: auto;
  padding: 0.75rem;
}

.assistant-answer pre code {
  background: transparent;
  border: 0;
  color: inherit;
  padding: 0;
}

.annotation-list {
  display: grid;
  gap: 0.6rem;
}

.annotation {
  border-left: 3px solid var(--color-accent);
  background: var(--color-surface-muted);
  padding: 0.7rem;
}

.annotation-head,
.annotation-actions,
.reply-form {
  align-items: center;
  display: flex;
  gap: 0.45rem;
}

.annotation-head {
  justify-content: space-between;
}

.annotation-head span {
  color: var(--color-muted);
  font-size: 0.82rem;
}

.annotation-actions {
  flex-wrap: wrap;
  margin-top: 0.55rem;
}

.annotation-actions button,
.reply-form button {
  min-height: 2rem;
  padding: 0.3rem 0.5rem;
}

.reply-list {
  display: grid;
  gap: 0.35rem;
  margin-top: 0.6rem;
}

.reply {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 0.45rem;
}

.reply strong {
  display: block;
  font-size: 0.82rem;
}

.reply-form {
  margin-top: 0.55rem;
}

.annotation.is-resolved {
  border-left-color: var(--color-muted);
  opacity: 0.72;
}

.annotation p {
  margin: 0.35rem 0;
}

.selection-toolbar {
  background: var(--color-text);
  box-shadow: 0 0.5rem 1.5rem rgb(0 0 0 / 18%);
  display: flex;
  gap: 0.3rem;
  padding: 0.35rem;
  position: absolute;
  z-index: 20;
}

.selection-toolbar button {
  background: var(--color-text);
  border-color: var(--color-muted);
  color: var(--color-surface);
}

.mermaid {
  border: 1px solid var(--color-border);
  overflow-x: auto;
  padding: 1rem;
}

.auth-page {
  display: grid;
  min-height: 100vh;
  place-items: center;
}

.auth-box,
.admin-page {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  margin: 2rem auto;
  max-width: 78rem;
  padding: 1.5rem;
}

.auth-box {
  width: min(26rem, calc(100vw - 2rem));
}

.form-stack,
.admin-form {
  display: grid;
  gap: 0.8rem;
}

.form-stack label,
.admin-form label {
  color: var(--color-muted);
  display: grid;
  gap: 0.25rem;
}

.form-error {
  background: var(--color-danger-soft);
  border: 1px solid var(--color-danger-border);
  color: var(--color-danger);
  padding: 0.65rem;
}

.admin-layout {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: minmax(0, 1fr) 22rem;
}

.user-table {
  border-collapse: collapse;
  width: 100%;
}

.user-table th,
.user-table td {
  border-bottom: 1px solid var(--color-border);
  padding: 0.55rem;
  text-align: left;
}

@media (max-width: 1120px) {
  .shell {
    grid-template-columns: 16rem minmax(0, 1fr);
  }

  .assistant-panel {
    grid-column: 1 / -1;
    height: auto;
    position: static;
  }
}

@media (max-width: 760px) {
  .shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    height: auto;
    position: static;
  }

  .content-wrap {
    padding: 1rem;
  }

  .article {
    padding: 1.25rem;
  }

  .admin-layout {
    grid-template-columns: 1fr;
  }
}