diff --git a/src/app.rs b/src/app.rs
index e758e77..352cf47 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -17,6 +17,12 @@ use crate::{
     prelude::*
 };
 
+/// Root component of the app.
+///
+/// Sets up meta context, creates the `Store<Dashboard>` (mock data for now)
+/// and injects it as context, then renders the shell: header, sidebar, nav
+/// and the routed page. Routes: `/` character, `/inv` inventories,
+/// `/wiki` wiki; anything else falls to `NotFound`.
 #[component]
 pub fn App() -> impl IntoView {
     // Provides context that manages stylesheets, titles, meta tags, etc.
diff --git a/src/components/header.rs b/src/components/header.rs
index e4832c6..8cafbdc 100644
--- a/src/components/header.rs
+++ b/src/components/header.rs
@@ -2,6 +2,9 @@ use crate::prelude::*;
 use chrono::TimeDelta;
 use leptos::prelude::*;
 
+/// Campaign header: editable name, campaign image, in-game date and
+/// session steppers, and Save/Load/Clear buttons (not wired yet — see
+/// ROADMAP phase 1).
 #[component]
 pub fn Header () -> impl IntoView {
     let state = expect_context::<Context>();
@@ -10,10 +13,12 @@ pub fn Header () -> impl IntoView {
     let session = state.session();
     let image = state.campaign_image();
 
+    // Shifts the in-game date by ±1 day (saturating, via checked_add_signed).
     let adjust_day = move |adjustment: i64| date.update(|d| {
         *d = d.checked_add_signed(TimeDelta::days(adjustment)).unwrap();
     });
 
+    // Shifts the session counter by ±1, guarding against underflow.
     let adjust_session = move |adjustment: isize| session.update(|s| {
         if let Some(new) = s.checked_add_signed(adjustment) {
             *s = new;
diff --git a/src/components/inventory.rs b/src/components/inventory.rs
index 01b818f..61d5415 100644
--- a/src/components/inventory.rs
+++ b/src/components/inventory.rs
@@ -2,6 +2,9 @@ use leptos::{logging, prelude::*};
 use reactive_stores::Field;
 use crate::{ components::{ item::Item as ItemRow, numput::Numput }, prelude::* };
 
+/// One inventory section: a titled balance block (five `Numput`s) and the
+/// item rows. `kind` decides personal/common styling and the move
+/// direction.
 #[component]
 pub fn Inventory (
     kind: InventoryKind,
@@ -11,10 +14,12 @@ pub fn Inventory (
 
     let state = expect_context::<Context>();
 
+    // Removes the row at `idx` from this inventory.
     let rm = move |idx: usize| inventory.update(|v| {
         v.rows.remove(idx);
     });
 
+    // Moves the row at `idx` to the other inventory (personal ↔ common).
     let mv = move |idx: usize| {
         let (from, to): (Field<Inventory>, Field<Inventory>) = match kind.dst() {
             InventoryKind::Personal => (state.common().inventory().into(), state.player().inventory().into()),
diff --git a/src/components/item.rs b/src/components/item.rs
index 1a720ec..53193c0 100644
--- a/src/components/item.rs
+++ b/src/components/item.rs
@@ -3,6 +3,9 @@ use leptos::prelude::*;
 
 use reactive_stores::{Field, OptionStoreExt};
 
+/// One inventory row: name, quantity stepper + `Numput`, weight stepper +
+/// `Numput`, and more/swap/remove buttons. A weight-based tag drives the
+/// CSS class. The "…" button is not wired yet (ROADMAP phase 3).
 #[component]
 pub fn Item (
     idx: ReadSignal<usize>,
@@ -16,10 +19,14 @@ pub fn Item (
 
     let empty = String::new();
 
+    // CSS class from the item's weight tag ("weight" key).
     let class = move || format!("item {}", item().tags().get().get("weight").unwrap_or(&empty));
 
+    // Weight shown as a decimal: basis points → "x.yy".
     let weight_display = move || item().weight().with(|f| f.to_decimal_string());
 
+    // Parses weight input: "+n"/"-n" adjust relative, plain numbers set
+    // absolutely, anything else restores the current value.
     let weight_change = move |ev: Targeted<Event, HtmlInputElement>| {
         let old = item().weight().get_untracked();
         let new = ev.target().value();
diff --git a/src/components/mod.rs b/src/components/mod.rs
index 38922cd..1d73e2a 100644
--- a/src/components/mod.rs
+++ b/src/components/mod.rs
@@ -1,3 +1,9 @@
+//! UI components.
+//!
+//! `header`, `sidebar` and `nav` form the app shell; `inventory`, `item`
+//! and `numput` implement the inventories page; the page components
+//! (`Character`, `Inventories`, `Wiki`) and the item search live in this
+//! module root.
 use leptos::prelude::*;
 use nucleo_matcher::{ pattern::{ CaseMatching, Pattern, Normalization }, Config, Matcher };
 use reactive_stores::Field;
@@ -11,6 +17,8 @@ pub mod inventory;
 pub mod numput;
 pub mod item;
 
+/// Character page (route `/`). Stub: renders a placeholder until
+/// ROADMAP phase 2.
 #[component]
 pub fn Character () -> impl IntoView {
     view! {
@@ -18,6 +26,8 @@ pub fn Character () -> impl IntoView {
     }
 }
 
+/// Inventories page (route `/inv`): the player's and the party's
+/// inventories side by side, each with money and item rows.
 #[component]
 pub fn Inventories () -> impl IntoView {
     let state = expect_context::<Context>();
@@ -40,6 +50,8 @@ pub fn Inventories () -> impl IntoView {
     }
 }
 
+/// Wiki page (route `/wiki`). Stub: renders a placeholder until
+/// ROADMAP phase 7.
 #[component]
 pub fn Wiki () -> impl IntoView {
     view! {
@@ -47,6 +59,11 @@ pub fn Wiki () -> impl IntoView {
     }
 }
 
+/// Fuzzy item search over the bundled item names.
+///
+/// Re-matches on every keystroke (nucleo) and renders result cards. The
+/// "+" buttons on the cards are not wired to the inventory yet (ROADMAP
+/// phase 3).
 #[component]
 pub fn ItemSearchField () -> impl IntoView {
     let (query, set_query) = signal("".to_owned());
@@ -86,6 +103,7 @@ pub fn ItemSearchField () -> impl IntoView {
 }
 
 
+/// One search result: name, weight, rarity and an (unwired) add button.
 #[component]
 pub fn ItemSearchCard <'a> (item: &'a BookItem) -> impl IntoView {
     let card_class = format!("item-search-card {}", item.rarity.as_ref().unwrap_or(&String::new()));
diff --git a/src/components/nav.rs b/src/components/nav.rs
index 52b3328..d81084c 100644
--- a/src/components/nav.rs
+++ b/src/components/nav.rs
@@ -2,6 +2,7 @@ use crate::prelude::*;
 use leptos::prelude::*;
 use leptos_router::components::A;
 
+/// Top navigation: links to the three routes (character, inventory, wiki).
 #[component]
 pub fn Nav () -> impl IntoView {
     view! {
diff --git a/src/components/numput.rs b/src/components/numput.rs
index 47bc70a..3abeb33 100644
--- a/src/components/numput.rs
+++ b/src/components/numput.rs
@@ -5,6 +5,11 @@ use num_format::{Locale, ToFormattedString};
 use num_traits::{ SaturatingSub, SaturatingAdd };
 use crate::prelude::*;
 
+/// Number input bound to a reactive field.
+///
+/// `+n` / `-n` adjust the current value relatively, a plain number sets it
+/// absolutely, and anything else is rejected (the input is restored). The
+/// value renders with thousands separators (`num_format`).
 #[component]
 pub fn Numput <T, U, 'a> (
     field: U,
@@ -37,6 +42,11 @@ pub fn Numput <T, U, 'a> (
     }
 }
 
+/// `Numput` with caller-supplied display and change handlers.
+///
+/// For fields whose display differs from the stored value (e.g. weights
+/// in basis points): `field_with` renders the input, `change` parses the
+/// edit.
 #[component]
 pub fn NumputChange <U, G, 'a> (
     mut field_with: U,
diff --git a/src/components/sidebar.rs b/src/components/sidebar.rs
index f1d3ff4..9e478a1 100644
--- a/src/components/sidebar.rs
+++ b/src/components/sidebar.rs
@@ -1,3 +1,5 @@
+//! Character sidebar: portrait, names, class/level/XP, HP, hit dice,
+//! death saves and spell slots.
 use crate::prelude::*;
 use leptos::prelude::*;
 
@@ -9,6 +11,8 @@ mod hit_dice;
 mod death_saving_throws;
 mod spell_slots;
 
+/// Left-hand character panel. Reads `Context` and stacks the sub-panels
+/// (image, names, about, HP, hit dice, death saves, spell slots).
 #[component]
 pub fn Sidebar () -> impl IntoView {
     view! {
diff --git a/src/components/sidebar/about.rs b/src/components/sidebar/about.rs
index 4b5e2dc..19dce0f 100644
--- a/src/components/sidebar/about.rs
+++ b/src/components/sidebar/about.rs
@@ -1,6 +1,7 @@
 use crate::prelude::*;
 use leptos::prelude::*;
 
+/// Class (text input), level (+/− steppers) and XP (number input).
 #[component]
 pub fn About () -> impl IntoView {
     let state = expect_context::<Context>();
@@ -10,12 +11,14 @@ pub fn About () -> impl IntoView {
     let level = player.level();
     let xp = player.xp();
 
+    // Steps the level by ±1, guarding against overflow.
     let adjust_level = move |adjustment: i8| level.update(|l| {
         if let Some(new) = l.checked_add_signed(adjustment) {
             *l = new;
         }
     });
 
+    // Applies the XP input with checked parsing (invalid text is reverted).
     let adjust_xp = move |ev: Targeted<Event, HtmlInputElement>| {
         utils::adjust_checked(ev, xp);
     };
diff --git a/src/components/sidebar/death_saving_throws.rs b/src/components/sidebar/death_saving_throws.rs
index 6338035..04b28f5 100644
--- a/src/components/sidebar/death_saving_throws.rs
+++ b/src/components/sidebar/death_saving_throws.rs
@@ -1,6 +1,8 @@
 use crate::prelude::*;
 use leptos::prelude::*;
 
+/// Three failure pips and three success pips, plus a reset button.
+/// Clicking a pip fills it; clicking the last filled pip empties it.
 #[component]
 pub fn DeathSavingThrows () -> impl IntoView {
     let state = expect_context::<Context>();
@@ -8,6 +10,7 @@ pub fn DeathSavingThrows () -> impl IntoView {
 
     let dt = player.death_save_throws();
 
+    // Toggles pip `slot_id` of the fail/success track.
     let process_dt_click = move |success: bool, slot_id: u8| {
         dt.update(|d| {
             let v = if success { &mut d.succeeded } else { &mut d.failed };
diff --git a/src/components/sidebar/hit_dice.rs b/src/components/sidebar/hit_dice.rs
index ce33f26..d02a2b5 100644
--- a/src/components/sidebar/hit_dice.rs
+++ b/src/components/sidebar/hit_dice.rs
@@ -1,6 +1,8 @@
 use crate::prelude::*;
 use leptos::prelude::*;
 
+/// Hit dice: a die-kind selector (d4 … d20) and one clickable die per
+/// character level; clicking toggles spent/unspent.
 #[component]
 pub fn HitDice () -> impl IntoView {
     let state = expect_context::<Context>();
@@ -8,6 +10,8 @@ pub fn HitDice () -> impl IntoView {
 
     let hit_dice = player.hit_dice();
     let level = player.level();
+    // Toggles die `slot_id` spent/unspent; clicking the last spent die
+    // frees it again.
     let process_die_click = move |slot_id: u8| {
         hit_dice.update(|d| {
             if slot_id < d.used {
diff --git a/src/components/sidebar/hit_points.rs b/src/components/sidebar/hit_points.rs
index 7e23970..1d3df35 100644
--- a/src/components/sidebar/hit_points.rs
+++ b/src/components/sidebar/hit_points.rs
@@ -1,6 +1,8 @@
 use crate::prelude::*;
 use leptos::prelude::*;
 
+/// Current/max HP with a fill bar, plus temp HP with its own bar.
+/// All three numbers are editable `type="number"` inputs.
 #[component]
 pub fn HitPoints () -> impl IntoView {
     let state = expect_context::<Context>();
@@ -10,6 +12,8 @@ pub fn HitPoints () -> impl IntoView {
     let max_hp = player.max_hp();
     let temp_hp = player.temp_hp();
 
+    // All three inputs parse via `utils::adjust_checked`; invalid text
+    // restores the previous value.
     let adjust_hp = move |ev: Targeted<Event, HtmlInputElement>| {
         utils::adjust_checked(ev, hp);
     };
diff --git a/src/components/sidebar/image.rs b/src/components/sidebar/image.rs
index 98aff86..ce68e29 100644
--- a/src/components/sidebar/image.rs
+++ b/src/components/sidebar/image.rs
@@ -1,6 +1,7 @@
 use crate::prelude::*;
 use leptos::prelude::*;
 
+/// Character portrait; hidden while no image URL is set.
 #[component]
 pub fn Image () -> impl IntoView {
     let state = expect_context::<Context>();
diff --git a/src/components/sidebar/names.rs b/src/components/sidebar/names.rs
index 4df6439..69df6b2 100644
--- a/src/components/sidebar/names.rs
+++ b/src/components/sidebar/names.rs
@@ -1,6 +1,8 @@
 use crate::prelude::*;
 use leptos::prelude::*;
 
+/// First name, alias (in «»), last name — three text inputs bound to the
+/// player's name store.
 #[component]
 pub fn Names () -> impl IntoView {
     let state = expect_context::<Context>();
diff --git a/src/components/sidebar/spell_slots.rs b/src/components/sidebar/spell_slots.rs
index 0c2994a..4971c1e 100644
--- a/src/components/sidebar/spell_slots.rs
+++ b/src/components/sidebar/spell_slots.rs
@@ -1,6 +1,8 @@
 use crate::prelude::*;
 use leptos::prelude::*;
 
+/// Spell slots for all nine levels: a row of clickable pips per level.
+/// Clicking toggles a slot used/unused.
 #[component]
 pub fn SpellSlots () -> impl IntoView {
     let state = expect_context::<Context>();
@@ -8,6 +10,7 @@ pub fn SpellSlots () -> impl IntoView {
 
     let slots = player.spell_slots();
 
+    // Toggles pip `slot_id` of `level` used/unused.
     let process_spell_slot_click = move |level: usize, slot_id: u8| {
         slots.update(|s| {
             let l = &mut s.0[level];
diff --git a/src/entities/mock.rs b/src/entities/mock.rs
index a624e44..36f80fb 100644
--- a/src/entities/mock.rs
+++ b/src/entities/mock.rs
@@ -1,7 +1,14 @@
+//! Hardcoded demo data.
+//!
+//! `Dashboard::mock()` is the app's only state source until persistence
+//! lands (ROADMAP phase 1).
 use crate::prelude::*;
 use super::*;
 
 impl Dashboard {
+/// Builds a fully populated demo dashboard: a level-8 character, two
+/// inventories, quests, notes and contacts. Used at startup and as the
+/// fallback state.
     pub fn mock () -> Self {
         let (p_inv, c_inv) = generate_mock_inventory();
 
@@ -47,6 +54,8 @@ impl Dashboard {
 
 
 
+/// Demo inventories: 10 personal items and 10 common items, each with a
+/// weight, description and tags.
 fn generate_mock_inventory() -> (Inventory, Inventory) {
     let a = vec![
         InventoryEntry { id: 1, quantity: 1, item: InventoryItem { name: "Vorpal Sword".to_string(), weight: 400, description: Some("A blade that severs heads with a single swing.".to_string()), tags: HashMap::from([ ("type".to_string(), "weapon".to_string()), ("rarity".to_string(), "legendary".to_string()), ]), }, },
@@ -79,6 +88,8 @@ fn generate_mock_inventory() -> (Inventory, Inventory) {
 
 
 
+/// Demo notes: one per session, with in-game dates, real timestamps and
+/// tags.
 fn generate_mock_notebook () -> NoteBook {
     NoteBook(vec![
         Note { session: 1, content: "Met Elminster in Waterdeep; hinted at Netherese ruin.".to_string(), date_ingame: NaiveDate::from_ymd_opt(1481, 4, 15).unwrap(), date_real: NaiveDateTime::parse_from_str("2025-09-01 14:30:00", "%Y-%m-%d %H:%M:%S").unwrap(), tags: HashSet::from_iter(vec!["Elminster".to_string(), "Waterdeep".to_string()]) },
@@ -96,6 +107,7 @@ fn generate_mock_notebook () -> NoteBook {
     ])
 }
 
+/// Demo quests with givers, locations, dates and rewards.
 fn generate_mock_questbook () -> QuestBook {
     QuestBook(vec![
         Quest { title: "Slay the Bandit Chief".to_string(), location_taken: Some("Waterdeep".to_string()), location_task: Some("Phandalin".to_string()), date_taken: Some(NaiveDate::from_ymd_opt(1481, 4, 15).unwrap()), date_by: Some(NaiveDate::from_ymd_opt(1481, 5, 15).unwrap()), description: Some("Kill the bandit leader.".to_string()), from: Some(Name { first: "Dagult".to_string(), last: "Neverember".to_string(), alias: "".to_string(), ..Default::default() }), reward: Some(Balance { platinum: 0, gold: 100, electrum: 0, silver: 0, copper: 0 }) },
@@ -111,6 +123,8 @@ fn generate_mock_questbook () -> QuestBook {
     ])
 }
 
+/// Demo contacts: mostly NPCs met by the party, plus a few merchants,
+/// living legends and the dead.
 fn generate_mock_contact_book () -> ContactBook {
     let mut contacts = HashMap::new();
     // 40 Characters Met by Party (80%)
@@ -172,6 +186,7 @@ fn generate_mock_contact_book () -> ContactBook {
 }
 
 
+/// Demo prepared spells. Currently an empty list — `Spell` is a stub.
 fn generate_prepared_spells_list () -> PreparedSpells {
     use PreparedSpell::*;
     let list = vec![
diff --git a/src/entities/mod.rs b/src/entities/mod.rs
index b498e4b..e340131 100644
--- a/src/entities/mod.rs
+++ b/src/entities/mod.rs
@@ -1,3 +1,16 @@
+//! The domain model of the campaign dashboard.
+//!
+//! Every type here is a plain data struct that derives
+//! [`reactive_stores::Store`], which makes each field independently
+//! reactive: components subscribe to single fields and re-render only when
+//! those change. The root type is [`Dashboard`], wrapped in a
+//! `Store<Dashboard>` and provided to the whole app through Leptos context
+//! (see `crate::prelude::Context`).
+//!
+//! The model is deliberately "wide": it covers the campaign header, the
+//! player character, the party's common stash, quests, notes, contacts and
+//! settings. All of it currently comes from hardcoded mock data (the `mock`
+//! module); nothing is persisted yet (see ROADMAP phase 1).
 use std::fmt::Display;
 
 use chrono::{ NaiveDate, NaiveDateTime };
@@ -7,6 +20,10 @@ use crate::prelude::*;
 
 mod mock;
 
+/// A single item as it appears in the bundled 5e.tools JSON files.
+///
+/// `rest` keeps every other JSON field verbatim, so the raw source data
+/// survives lookup (used by future item detail views).
 #[derive(Clone, Debug, Store)]
 pub struct BookItem {
     pub name: String,
@@ -16,6 +33,8 @@ pub struct BookItem {
 }
 
 impl BookItem {
+/// Parses one 5e.tools JSON object into a `BookItem`.
+/// Returns `None` when the object has no string `name` or is not an object.
     pub fn from_json (t: Value) -> Option<Self> {
         let Value::String(name) = t["name"].clone() else { return None };
         let weight = match t["weight"].clone() {
@@ -36,9 +55,17 @@ impl BookItem {
     }
 }
 
+/// Name → `BookItem` lookup, built once from the bundled JSON (see `statics`).
 #[derive(Clone, Debug, Store)]
 pub struct ItemReferenceMap (pub HashMap<String, BookItem>);
 
+/// The root application state.
+///
+/// One `Dashboard` holds everything the UI edits: campaign header data
+/// (name, image, session number, in-game date), the player character, the
+/// party's common inventory, quests, notes, contacts and settings. The
+/// whole tree derives `Store`, so every nested field is independently
+/// reactive. `Dashboard::mock()` provides the initial state.
 #[derive(Clone, Debug, Store)]
 pub struct Dashboard {
     pub campaign: String,
@@ -53,6 +80,9 @@ pub struct Dashboard {
     pub settings: Settings
 }
 
+/// The player character: identity, class, level, XP, hit points, money,
+/// spell slots, inventory, attunements, prepared spells, hit dice and
+/// death saves. This is the heart of the character sheet.
 #[derive(Clone, Debug, Store)]
 pub struct PlayerData {
     pub name: Name,
@@ -74,12 +104,15 @@ pub struct PlayerData {
 }
 
 
+/// The party's shared stash: money and items usable by everyone.
 #[derive(Clone, Debug, Store)]
 pub struct CommonData {
     pub balance: Balance,
     pub inventory: Inventory,
 }
 
+/// Currency counts per denomination, platinum through copper.
+/// Edited with `Numput` on the inventories page.
 #[derive(Clone, Debug, Store)]
 pub struct Balance {
     pub platinum: u32,
@@ -89,12 +122,17 @@ pub struct Balance {
     pub copper: u32,
 }
 
+/// A named inventory (personal or common): a list of entries.
+///
+/// `#[store(key)]` gives every entry a stable reactive key (its `id`),
+/// which keeps `For`/`ForEnumerate` updates cheap.
 #[derive(Clone, Debug, Store)]
 pub struct Inventory {
     #[store(key: u64 = |row| row.id)]
     pub rows: Vec<InventoryEntry>
 }
 
+/// One inventory row: a quantity of a single item.
 #[derive(Clone, Debug, Store, Default)]
 pub struct InventoryEntry {
     pub id: u64,
@@ -103,6 +141,7 @@ pub struct InventoryEntry {
 }
 
 impl InventoryEntry {
+/// Returns a stable key string for this entry (quantity + item name).
     pub fn key (&self) -> String {
         format!("{}-{}", self.quantity, self.item.name)
     }
@@ -114,6 +153,8 @@ impl InventoryEntry {
 //     Book (Item),
 // }
 
+/// An item inside an inventory: name, weight (basis points), optional
+/// description, and free-form tags (e.g. `type`, `rarity`).
 #[derive(Clone, Debug, Store, Default)]
 pub struct InventoryItem {
     pub name: String,
@@ -122,9 +163,12 @@ pub struct InventoryItem {
     pub tags: HashMap<String, String>,
 }
 
+/// The party's quest list. No UI yet — see ROADMAP phase 4.
 #[derive(Clone, Debug, Store)]
 pub struct QuestBook (pub Vec<Quest>);
 
+/// One quest: title, locations, dates, description, giver and reward.
+/// Note: there is no completion state yet (ROADMAP phase 4 adds one).
 #[derive(Clone, Debug, Store)]
 pub struct Quest {
     pub title: String,
@@ -137,9 +181,12 @@ pub struct Quest {
     pub reward: Option<Balance>,
 }
 
+/// The party's session notes. No UI yet — see ROADMAP phase 5.
 #[derive(Clone, Debug, Store)]
 pub struct NoteBook (pub Vec<Note>);
 
+/// One note: content, in-game date, real-world timestamp, session number
+/// and tags.
 #[derive(Clone, Debug, Store)]
 pub struct Note {
     pub content: String,
@@ -149,35 +196,43 @@ pub struct Note {
     pub tags: HashSet<String>,
 }
 
+/// Spell slots for the nine spell levels (index 0 = 1st level).
 #[derive(Clone, Debug, Store)]
 pub struct SpellSlots (pub [SpellSlotLevel; 9]);
 
+/// Used/total slots for one spell level.
 #[derive(Clone, Debug, Store)]
 pub struct SpellSlotLevel {
     pub used: u8,
     pub total: u8,
 }
 
+/// Three attunement slots (D&D rules allow three attuned items).
 #[derive(Clone, Debug, Store)]
 pub struct Attunements (pub [Option<String>; 3]);
 
 
+/// The spell list the character has prepared (or is learning).
 #[derive(Clone, Debug, Store)]
 pub struct PreparedSpells (pub Vec<PreparedSpell>);
 
 
+/// One prepared-spell slot: vacant or holding a spell.
 #[derive(Clone, Debug, Store)]
 pub enum PreparedSpell {
     Vacant,
     Occupied (Spell)
 }
 
+/// A spell. Only the name exists so far; the rest is a `@TODO`
+/// (see ROADMAP phase 2).
 // @TODO
 #[derive(Clone, Debug, Store)]
 pub struct Spell {
     pub name: String
 }
 
+/// Hit dice: how many of the current die kind are already spent.
 #[derive(Clone, Debug, Store)]
 pub struct HitDice {
     pub used: u8,
@@ -185,6 +240,8 @@ pub struct HitDice {
 }
 
 
+/// Death-saving-throw counters: three failures kill, three successes
+/// stabilize.
 #[derive(Clone, Debug, Store)]
 pub struct DeathSaveThrows {
     pub failed: u8,
@@ -192,15 +249,18 @@ pub struct DeathSaveThrows {
 }
 
 impl DeathSaveThrows {
+/// Clears both counters. Bound to the ⟳ button in the sidebar.
     pub fn reset (&mut self) {
         self.failed = 0;
         self.succeeded = 0;
     }
 }
 
+/// Known NPCs keyed by name. No UI yet — see ROADMAP phase 6.
 #[derive(Clone, Debug, Store)]
 pub struct ContactBook (pub HashMap<String, Contact>);
 
+/// One NPC contact: name, optional image, status, location and notes.
 #[derive(Clone, Debug, Store)]
 pub struct Contact {
     pub name: Name,
@@ -210,6 +270,7 @@ pub struct Contact {
     pub notes: Option<String>,
 }
 
+/// Life status of a contact, used for filtering.
 #[derive(Clone, Debug, Store)]
 pub enum ContactStatus {
     Unknown,
@@ -218,6 +279,7 @@ pub enum ContactStatus {
     Alive,
 }
 
+/// A person's name: first, last, and an optional alias (nickname).
 #[derive(Clone, Debug, Store, Default)]
 pub struct Name {
     pub first: String,
@@ -226,26 +288,31 @@ pub struct Name {
 }
 
 impl Name {
+/// True when an alias is set.
     pub fn display_alias (&self) -> bool {
         !self.alias.is_empty()
     }
+/// True when a last name is set.
     pub fn display_last (&self) -> bool {
         !self.last.is_empty()
     }
 }
 
+/// App settings. Empty today; will carry e.g. a persisted-format version.
 #[derive(Clone, Debug, Store, Default)]
 pub struct Settings {
 
 }
 
 
+/// Which side of the party an inventory belongs to.
 #[derive(Clone, Copy, Debug, Store)]
 pub enum InventoryKind {
     Personal,
     Common
 }
 
+/// Russian display name ("Личный" / "Общий").
 impl Display for InventoryKind {
     fn fmt (&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         write!(f, "{}", match self {
@@ -256,6 +323,7 @@ impl Display for InventoryKind {
 }
 
 impl InventoryKind {
+/// The other inventory (for the move-between button).
     pub fn dst (&self) -> Self {
         match self {
             Self::Common => Self::Personal,
@@ -263,6 +331,7 @@ impl InventoryKind {
         }
     }
 
+/// CSS classes for the inventory section (personal vs common styling).
     pub fn class (&self) -> &'static str {
         match self {
             Self::Common => "inventory inventory-common",
diff --git a/src/lib.rs b/src/lib.rs
index fd0a6c8..7ee24e3 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,3 +1,8 @@
+//! aex — a D&D 5e character sheet and campaign dashboard.
+//!
+//! Leptos 0.8 app with actix-web SSR and client-side hydration. The crate
+//! root declares the modules and the WASM entry point; `main.rs` holds the
+//! SSR server, `app.rs` the component tree.
 #![feature(type_alias_impl_trait)]
 pub mod app;
 
@@ -21,6 +26,8 @@ mod components;
 #[allow(unused_imports)]
 use prelude::*;
 
+/// WASM entry point: hydrates `App` into the server-rendered DOM.
+/// Only compiled with the `hydrate` feature.
 #[cfg(feature = "hydrate")]
 #[wasm_bindgen::prelude::wasm_bindgen]
 pub fn hydrate() {
diff --git a/src/main.rs b/src/main.rs
index 9038f32..4eb630a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,4 +1,9 @@
 
+/// SSR entry point: starts the actix-web server that renders the app.
+///
+/// Serves the WASM/CSS bundle from `/pkg`, static assets from `/assets`,
+/// and renders every route through `leptos_routes`. Only compiled with
+/// the `ssr` feature.
 #[cfg(feature = "ssr")]
 #[actix_web::main]
 async fn main() -> std::io::Result<()> {
@@ -58,6 +63,7 @@ async fn main() -> std::io::Result<()> {
     .await
 }
 
+/// Serves `/favicon.ico` from the site root.
 #[cfg(feature = "ssr")]
 #[actix_web::get("favicon.ico")]
 async fn favicon(
@@ -70,6 +76,8 @@ async fn favicon(
     ))?)
 }
 
+/// No-op `main` for builds without `ssr` or `csr`: the WASM binary is
+/// hydrated from `lib.rs` instead.
 #[cfg(not(any(feature = "ssr", feature = "csr")))]
 pub fn main() {
     // no client-side main function
@@ -78,6 +86,8 @@ pub fn main() {
     // see optional feature `csr` instead
 }
 
+/// Client-only `main` for `trunk serve --features csr`.
+/// Not the normal path — prefer `cargo leptos serve`.
 #[cfg(all(not(feature = "ssr"), feature = "csr"))]
 pub fn main() {
     // a client-side main function is required for using `trunk serve`
diff --git a/src/prelude.rs b/src/prelude.rs
index 9bf1fbf..e99d31b 100644
--- a/src/prelude.rs
+++ b/src/prelude.rs
@@ -1,3 +1,7 @@
+//! Crate-wide re-exports.
+//!
+//! Components and entities use `use crate::prelude::*` to get the common
+//! imports: collections, logging, error aliases, `Store`, entities, utils.
 #![allow(unused_imports)]
 #![allow(dead_code)]
 pub use std::collections::{ HashMap, HashSet };
@@ -16,6 +20,12 @@ pub (crate) use crate::{
     components::{ self, numput::{ Numput, NumputChange } },
 };
 
+/// Crate-wide error type. Alias of `anyhow::Error`.
 pub type Error = anyhow::Error;
+/// Crate-wide result type. Alias of `anyhow::Result<T>`.
 pub type Result <T> = anyhow::Result<T>;
+/// The reactive application state: a `Store` wrapping [`crate::entities::Dashboard`].
+///
+/// Created once in `App` and injected through Leptos context. Components
+/// read it with `expect_context::<Context>()` and grab reactive field handles.
 pub type Context = Store<Dashboard>;
diff --git a/src/state/mod.rs b/src/state/mod.rs
index 3616db2..96c0a33 100644
--- a/src/state/mod.rs
+++ b/src/state/mod.rs
@@ -1 +1,6 @@
+//! App state.
+//!
+//! The whole dashboard lives in one `reactive_stores::Store<Dashboard>`
+//! (alias `Context`), created in `App` and shared through Leptos context.
+
 use crate::prelude::*;
diff --git a/src/statics/mod.rs b/src/statics/mod.rs
index da21bbe..27ce679 100644
--- a/src/statics/mod.rs
+++ b/src/statics/mod.rs
@@ -1,8 +1,18 @@
+//! Bundled static game data.
+//!
+//! `ITEMS_REFS` loads the 5e.tools-format JSON files (`data/*.json`,
+//! roughly 5k items) once at first use via `lazy_static` and indexes them
+//! by name. `ITEMS_NAMES` is the flat name list used for fuzzy search.
 use crate::prelude::*;
 use lazy_static::lazy_static;
 
 
 lazy_static! {
+/// All known items, indexed by name, from the bundled 5e.tools JSON files.
+///
+/// Built once at startup: entries with the same name are merged (a missing
+/// weight fills in, `rest` fields concatenate). Note `foundry.json` is
+/// currently loaded twice — see `utils::read_items`.
     pub static ref ITEMS_REFS: ItemReferenceMap = {
         let mut map = HashMap::with_capacity(5_000);
 
@@ -17,6 +27,8 @@ lazy_static! {
         ItemReferenceMap(HashMap::from_iter(map.into_iter()))
     };
 
+/// Flat list of item names; the feed for the fuzzy matcher
+/// (`ItemSearchField`).
     pub static ref ITEMS_NAMES: Vec<&'static String> = {
         ITEMS_REFS.0.keys().collect()
     };
diff --git a/src/utils/mod.rs b/src/utils/mod.rs
index 9b8cb44..465b469 100644
--- a/src/utils/mod.rs
+++ b/src/utils/mod.rs
@@ -1,3 +1,5 @@
+//! Small shared helpers: item parsing, checked input parsing, percentage
+//! math, and the `BasisPoints` display trait.
 use crate::prelude::*;
 use std::str::FromStr;
 use leptos::ev::{ Event, Targeted };
@@ -5,6 +7,11 @@ use leptos::web_sys::HtmlInputElement;
 use leptos::reactive::traits::{ Get, Set };
 
 
+/// Parses a 5e.tools-format JSON array of items into `map`, keyed by name.
+///
+/// Skips entries without a string `name` or without an object body.
+/// Duplicate names merge: the later entry's weight fills a missing one and
+/// its `rest` fields are appended. Returns the number of new names added.
 pub fn read_items (contents: &str, map: &mut HashMap<String, BookItem>) -> usize {
     let Ok(json): std::result::Result<Value, _> = serde_json::from_str(&contents) else { error!("Can't read Value from contents"); return 0 };
     let Value::Array(list) = json else { error!("Value isn't Array, skipping"); return 0 };
@@ -24,6 +31,10 @@ pub fn read_items (contents: &str, map: &mut HashMap<String, BookItem>) -> usize
     map.len() - start
 }
 
+/// Applies a text input's value to a reactive store with checked parsing.
+///
+/// On a successful parse, sets the store to the value; otherwise restores
+/// the input to the store's current value. Used for `type="number"` inputs.
 pub fn adjust_checked <T, U> (ev: Targeted<Event, HtmlInputElement>, store: U) -> ()
     where
         U: Set<Value = T> + Get<Value = T>,
@@ -39,6 +50,8 @@ pub fn adjust_checked <T, U> (ev: Targeted<Event, HtmlInputElement>, store: U) -
     }
 }
 
+/// Percent of `cur` relative to `max`; callers clamp to 100. Used for
+/// HP-bar widths.
 pub fn filled_pc <T> (cur: T, max: T) -> f32 where T: Into<f32> {
     let cur: f32 = cur.into();
     let max: f32 = max.into();
@@ -46,10 +59,13 @@ pub fn filled_pc <T> (cur: T, max: T) -> f32 where T: Into<f32> {
 }
 
 
+/// Formats an integer stored in basis points (hundredths) as a decimal
+/// string, e.g. `400` → `"4.00"`.
 pub trait BasisPoints {
     fn to_decimal_string (&self) -> String;
 }
 
+/// Weights are stored as `u32` basis points: 100 = 1.0.
 impl BasisPoints for u32 {
     fn to_decimal_string (&self) -> String {
         let int = self / 100;