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diff --git a/Sources/NorgUI/Theme/NorgTheme.swift b/Sources/NorgUI/Theme/NorgTheme.swift
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+++ b/Sources/NorgUI/Theme/NorgTheme.swift
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+import NorgKit
+import SwiftUI
+
+/// Typography and colours used when rendering a Norg document.
+public struct NorgTheme: Sendable {
+
+  /// Font for a heading at the given (1-based) level.
+  public var heading: @Sendable (Int) -> Font
+  /// Base font for body text, list items and paragraphs.
+  public var body: Font
+  /// Font for the title of a definition, footnote or table cell.
+  public var termFont: Font
+  /// Foreground colour for `verbatim` inline spans.
+  public var verbatimColor: Color
+  /// Foreground colour for `spoiler` inline spans.
+  public var spoilerForeground: Color
+  /// Background colour for `spoiler` inline spans.
+  public var spoilerBackground: Color
+  /// Foreground colour applied to link spans.
+  public var linkColor: Color
+  /// Baseline offset applied to `superscript` spans.
+  public var superscriptOffset: CGFloat
+  /// Baseline offset applied to `subscript` spans.
+  public var subscriptOffset: CGFloat
+  /// Foreground colour for block quotes.
+  public var quoteColor: Color
+  /// Fill colour for the vertical bar drawn alongside a quote.
+  public var quoteBarColor: Color
+  /// Background fill for fenced code blocks and ranged tags.
+  public var codeBackground: AnyShapeStyle
+  /// Font for code block and ranged-tag contents.
+  public var codeFont: Font
+  /// Horizontal indentation applied per nesting level.
+  public var indentWidth: CGFloat
+  /// Tint for a task's status symbol.
+  public var statusTint: @Sendable (TaskStatus) -> Color
+  /// SF Symbol name for a task's status symbol.
+  public var statusSymbol: @Sendable (TaskStatus) -> String
+  /// Localized label for a task status, shown in the status menu and used
+  /// for accessibility. Defaults to ``TaskStatus/displayName``; override to
+  /// supply wording from your own string catalog.
+  public var statusLabel: @Sendable (TaskStatus) -> LocalizedStringResource
+
+  public init(
+    heading: @escaping @Sendable (Int) -> Font,
+    body: Font,
+    termFont: Font,
+    verbatimColor: Color,
+    spoilerForeground: Color,
+    spoilerBackground: Color,
+    linkColor: Color,
+    superscriptOffset: CGFloat,
+    subscriptOffset: CGFloat,
+    quoteColor: Color,
+    quoteBarColor: Color,
+    codeBackground: AnyShapeStyle,
+    codeFont: Font,
+    indentWidth: CGFloat,
+    statusTint: @escaping @Sendable (TaskStatus) -> Color,
+    statusSymbol: @escaping @Sendable (TaskStatus) -> String,
+    statusLabel: @escaping @Sendable (TaskStatus) -> LocalizedStringResource = { $0.displayName }
+  ) {
+    self.heading = heading
+    self.body = body
+    self.termFont = termFont
+    self.verbatimColor = verbatimColor
+    self.spoilerForeground = spoilerForeground
+    self.spoilerBackground = spoilerBackground
+    self.linkColor = linkColor
+    self.superscriptOffset = superscriptOffset
+    self.subscriptOffset = subscriptOffset
+    self.quoteColor = quoteColor
+    self.quoteBarColor = quoteBarColor
+    self.codeBackground = codeBackground
+    self.codeFont = codeFont
+    self.indentWidth = indentWidth
+    self.statusTint = statusTint
+    self.statusSymbol = statusSymbol
+    self.statusLabel = statusLabel
+  }
+
+  /// The default theme.
+  public static let `default` = NorgTheme(
+    heading: { level in
+      switch level {
+      case 1: return .title.bold()
+      case 2: return .title2.bold()
+      case 3: return .title3.bold()
+      case 4: return .headline
+      case 5: return .subheadline.bold()
+      default: return .subheadline
+      }
+    },
+    body: .body,
+    termFont: .body.bold(),
+    verbatimColor: .pink,
+    spoilerForeground: .secondary,
+    spoilerBackground: .secondary.opacity(0.25),
+    linkColor: .accentColor,
+    superscriptOffset: 5,
+    subscriptOffset: -3,
+    quoteColor: .secondary,
+    quoteBarColor: .secondary,
+    codeBackground: AnyShapeStyle(.quaternary),
+    codeFont: .system(.callout, design: .monospaced),
+    indentWidth: 18,
+    statusTint: { status in
+      switch status {
+      case .done: return .green
+      case .urgent: return .red
+      case .pending: return .blue
+      default: return .secondary
+      }
+    },
+    statusSymbol: { status in
+      switch status {
+      case .undone: return "circle"
+      case .done: return "checkmark.circle.fill"
+      case .needsInput: return "questionmark.circle"
+      case .urgent: return "exclamationmark.circle"
+      case .recurring: return "repeat.circle"
+      case .pending: return "ellipsis.circle"
+      case .onHold: return "pause.circle"
+      case .cancelled: return "xmark.circle"
+      }
+    }
+  )
+}