diff --git a/game.py b/game.py
index 41ec031..6f6e6ce 100644
--- a/game.py
+++ b/game.py
@@ -1883,10 +1883,10 @@ SEASON_DAYS = 7
 # `speed` multiplies action time (below 1 is faster), `yield` multiplies output,
 # `food` multiplies what the townsfolk eat, `firewood` is logs per person per hour.
 WEATHER = {
-    "clear": {"name": "Clear skies", "icon": "🌤️", "text": "Nothing out of the ordinary"},
+    "clear": {"name": "Clear skies", "icon": "🌤️", "text": "No effect on work or the city"},
     "rain": {"name": "Rain", "icon": "🌧️", "speed": {"farming": 0.9}, "text": "Farming 10% faster"},
     "heat": {"name": "Heat wave", "icon": "🥵", "speed": {"farming": 0.85}, "food": 1.15,
-             "text": "Farming 15% faster, but food spoils faster"},
+             "text": "Farming 15% faster, but food spoils: the city eats 15% more"},
     "storm": {"name": "Storm", "icon": "⛈️", "speed": {"fishing": 1.25}, "text": "Fishing 25% slower"},
     "fog": {"name": "Fog", "icon": "🌫️", "speed": {"reconnaissance": 1.3, "hunting": 1.1},
             "text": "Scouting 30% and hunting 10% slower"},
@@ -2609,5 +2609,5 @@ def content() -> dict:
         "city_uses": {item: city_uses(item) for item in ITEMS},
         "prayers": [{**prayer, "text": describe_prayer(prayer)} for prayer in PRAYERS], "max_prayers": MAX_PRAYERS,
         "potion_charges": POTION_CHARGES, "problems": PROBLEMS, "fittings": list(FITTING_BY_ID.values()),
-        "equip_slots": EQUIP_SLOTS, "eat_below": EAT_BELOW, "regen_per_hour": REGEN_PER_HOUR,
+        "equip_slots": EQUIP_SLOTS, "eat_below": EAT_BELOW, "class_speed": CLASS_SPEED, "regen_per_hour": REGEN_PER_HOUR,
     }
diff --git a/static/app.js b/static/app.js
index 8774762..59ee241 100644
--- a/static/app.js
+++ b/static/app.js
@@ -217,8 +217,8 @@ function setMenu(open) {
   document.documentElement.classList.toggle("menu-open", open);
 }
 
-function nav(id, icon, label, meta = "", extra = "") {
-  return `<button class="nav ${page === id ? "on" : ""}" data-nav="${id}"><span class="ic">${icon}</span><span class="label">${label}</span>${extra}<span class="meta">${meta}</span></button>`;
+function nav(id, icon, label, meta = "", extra = "", tip = "") {
+  return `<button class="nav ${page === id ? "on" : ""}" data-nav="${id}"${tip ? ` title="${esc(tip)}"` : ""}><span class="ic">${icon}</span><span class="label">${label}</span>${extra}<span class="meta">${meta}</span></button>`;
 }
 
 function sidebar() {
@@ -230,16 +230,16 @@ function sidebar() {
     <div class="me">
       <div class="who">${esc(me.name)}</div>
       <div class="cls">${cls.icon} ${cls.name} · ${HEART} ${fmt(me.hp)}/${me.max_hp}</div>
-      <div class="purse"><span class="gold" title="Gold">${COIN} ${fmt(me.gold)}</span><span class="favour" title="Favour">${FAVOUR} ${fmt(me.favour)}</span></div>
+      <div class="purse"><span class="gold" title="Gold: from fights and selling. Fund buildings with it or give it to the treasury">${COIN} ${fmt(me.gold)}</span><span class="favour" title="Favour: earned by giving to the city. Spend it on the Council page, or on extra bank slots">${FAVOUR} ${fmt(me.favour)}</span></div>
     </div>
     <div class="navhead">City</div>
-    ${nav("town", "🏘️", "Town square", `${S.city.population}`)}
-    ${nav("council", "📜", "Council & threats", "", raid ? `<span class="alert"></span>` : "")}
+    ${nav("town", "🏘️", "Town square", `${S.city.population}`, "", `Population ${S.city.population}`)}
+    ${nav("council", "📜", "Council & threats", "", raid ? `<span class="alert"></span>` : "", raid ? "A threat is coming" : "")}
     ${nav("board", "💬", "Town board")}
-    ${nav("roster", "👥", "Guild roster", `${S.players.length}`)}
+    ${nav("roster", "👥", "Guild roster", `${S.players.length}`, "", `${S.players.length} ${S.players.length === 1 ? "adventurer" : "adventurers"}`)}
     <div class="navhead">You</div>
-    ${nav("character", cls.icon, "Character", `${skillOf("combat").icon} ${me.levels.combat}`)}
-    ${nav("bank", "🏦", "Bank", `${me.slots_used}/${me.slots}`)}`;
+    ${nav("character", cls.icon, "Character", `${skillOf("combat").icon} ${me.levels.combat}`, "", `Combat level ${me.levels.combat}`)}
+    ${nav("bank", "🏦", "Bank", `${me.slots_used}/${me.slots}`, "", `${me.slots_used} of ${me.slots} bank slots used`)}`;
   let group = null;
   for (const skill of C.skills) {
     if (skill.class && skill.class !== me.cls) continue;
@@ -283,7 +283,7 @@ function topbar() {
     chips += `<span class="chip muted">Idle${S.me.stopped ? ` · ${esc(S.me.stopped)}` : ""}</span>`;
   }
   const w = S.happenings?.weather;
-  if (w) chips += `<button class="chip" data-nav="town" title="${esc(w.name)}: ${esc(w.text)}">${w.icon}</button>`;
+  if (w) chips += `<button class="chip" data-nav="town" title="${esc(weatherTip(w))}">${w.icon}</button>`;
   if (S.upcoming) chips += `<button class="chip ${["raid", "dragon"].includes(S.upcoming.kind) ? "threat" : ""}" data-nav="council">${eventIcon(S.upcoming.kind)} ${eventWhen(S.upcoming, true)}</button>`;
   return `<button class="menu-btn" data-menu aria-label="Menu">☰</button><h1>${esc(title)}</h1>${chips}`;
 }
@@ -317,7 +317,7 @@ function itemChip(id, qty, have) {
 
 // Progress towards a building cost: "have / need".
 function costChip(icon, name, need, have) {
-  return `<span class="item-chip ${have < need ? "short" : ""}" title="${esc(name)}">${icon} ${fmt(have)} <span class="have">/ ${fmt(need)}</span></span>`;
+  return `<span class="item-chip ${have < need ? "short" : ""}" title="${esc(`${name}: ${have < need ? `${fmt(need - have)} more needed` : "done"}`)}">${icon} ${fmt(have)} <span class="have">/ ${fmt(need)}</span></span>`;
 }
 
 // --- skill pages ----------------------------------------------------------
@@ -532,7 +532,7 @@ function bank() {
     return parts;
   });
   let slots = stacks.map(([id, q]) => `
-    <button class="slot ${selected === id ? "on" : ""}" data-select="${id}" title="${esc(item(id).name)}: ${fmt(me.bank[id])} in all">
+    <button class="slot ${selected === id ? "on" : ""}" data-select="${id}" title="${esc(item(id).name)}: ${fmt(me.bank[id])}${me.bank[id] > me.stack ? ` across ${Math.ceil(me.bank[id] / me.stack)} slots` : ""}">
       <span class="qty ${q >= me.stack ? "full" : ""}">${fmt(q)}</span>${item(id).icon}<span class="nm">${esc(item(id).name)}</span>
     </button>`).join("");
   for (let i = stacks.length; i < me.slots; i++) slots += `<div class="slot empty"></div>`;
@@ -665,9 +665,15 @@ function siteBanner() {
   </div></div>`;
 }
 
+// "Rain: farming 10% faster. Clear skies in 3h 20m."
+function weatherTip(w) {
+  const next = w.next === w.kind ? `Staying ${w.name.toLowerCase()}` : w.next_name;
+  return `${w.name}: ${w.text.charAt(0).toLowerCase()}${w.text.slice(1)}. ${next} in ${dur(w.until - serverNow())}.`;
+}
+
 function weatherCard() {
   const h = S.happenings, w = h.weather;
-  return `<div class="stat" title="${esc(w.text)}"><div class="k">${h.season.icon} ${h.season.name}, day ${h.season.day}</div>
+  return `<div class="stat" title="${esc(`${weatherTip(w)} Weather changes every few hours; each season lasts a week.`)}"><div class="k">${h.season.icon} ${h.season.name}, day ${h.season.day}</div>
     <div class="v">${w.icon} <small>${esc(w.name)}</small></div>
     <div class="note">${w.next === w.kind ? `Staying ${esc(w.name.toLowerCase())}` : `${w.next_icon} ${esc(w.next_name)}`} in ${countdown(w.until)}</div></div>`;
 }
@@ -883,7 +889,7 @@ function board() {
 function roster() {
   return `<div class="grid wide">${S.players.map((p) => {
     const cls = C.classes[p.cls];
-    const levels = C.skills.filter((s) => !s.class || s.class === p.cls).map((s) => `<div class="lvl ${p.levels[s.id] <= 1 ? "low" : ""}" title="${s.name}"><span class="ico">${s.icon}</span><span class="nm">${s.name}</span><b>${p.levels[s.id]}</b></div>`).join("");
+    const levels = C.skills.filter((s) => !s.class || s.class === p.cls).map((s) => `<div class="lvl ${p.levels[s.id] <= 1 ? "low" : ""}" title="${s.name} level ${p.levels[s.id]}"><span class="ico">${s.icon}</span><span class="nm">${s.name}</span><b>${p.levels[s.id]}</b></div>`).join("");
     return `<div class="panel person"><div class="top"><span class="ico">${cls.icon}</span><div>
       <b>${esc(p.name)}</b> <span class="muted small">${cls.name} · total level ${p.total}</span>
       <div class="small">${p.doing ? `${skillOf(p.skill).icon} ${esc(p.doing)}` : `<span class="muted">Idle</span>`}${p.garrison ? ` · <span class="tag warn">On guard</span>` : ""}</div>
@@ -925,8 +931,8 @@ function characterSheet(uid) {
     const floor = C.xp_table[level], ceil = C.xp_table[level + 1];
     const pct = ceil ? (xp - floor) / (ceil - floor) * 100 : 100;
     const tool = p.equip[`tool_${s.id}`];
-    const marks = (cls.fast.includes(s.id) ? `<span title="${cls.name} bonus">${cls.icon}</span>` : "")
-      + (tool ? `<span title="${esc(item(tool).name)}">${item(tool).icon}</span>` : "");
+    const marks = (cls.fast.includes(s.id) ? `<span title="${cls.name}: ${Math.round((1 - C.class_speed) * 100)}% faster">${cls.icon}</span>` : "")
+      + (tool ? `<span title="${esc(`${item(tool).name}: ${Math.round(item(tool).speed * 100)}% faster`)}">${item(tool).icon}</span>` : "");
     return `<${mine ? `button data-nav="skill:${s.id}"` : "div"} class="sheet-skill">
       <span class="ico">${s.icon}</span>
       <span class="grow"><span class="row1"><b>${s.name}</b><span class="marks">${marks}</span><span class="lv">${level}</span></span>