6 files changed, 304 insertions, 0 deletions
diff --git a/frontend/components/prism/AppShell.tsx b/frontend/components/prism/AppShell.tsx
new file mode 100644
index 0000000..63fd62b
--- /dev/null
+++ b/frontend/components/prism/AppShell.tsx
@@ -0,0 +1,20 @@
+import type { ReactNode } from "react";
+
+type Props = {
+  sidebar: ReactNode;
+  topbar: ReactNode;
+  children: ReactNode;
+};
+
+export function AppShell({ sidebar, topbar, children }: Props) {
+  return (
+    <main className="prism-app">
+      {sidebar}
+      <div className="psm-main">
+        {topbar}
+        <section className="psm-content">{children}</section>
+      </div>
+    </main>
+  );
+}
+
diff --git a/frontend/components/prism/ChartCard.tsx b/frontend/components/prism/ChartCard.tsx
new file mode 100644
index 0000000..bc650d7
--- /dev/null
+++ b/frontend/components/prism/ChartCard.tsx
@@ -0,0 +1,55 @@
+import { PriceChart } from "@/components/PriceChart";
+import type { HistoryPoint } from "@/types/api";
+
+const PERIODS = [
+  { key: "1m", label: "1M" },
+  { key: "3m", label: "3M" },
+  { key: "6m", label: "6M" },
+  { key: "1y", label: "1Y" },
+  { key: "5y", label: "5Y" }
+];
+
+type Props = {
+  symbol: string;
+  period: string;
+  points: HistoryPoint[];
+  chartState: "idle" | "loading" | "ready" | "error";
+  chartError: string | null;
+  onChangePeriod: (period: string) => void;
+};
+
+export function ChartCard({ symbol, period, points, chartState, chartError, onChangePeriod }: Props) {
+  return (
+    <section className="psm-card">
+      <div className="psm-card-head">
+        <div>
+          <div className="psm-eyebrow">Price History</div>
+          <h2 className="psm-card-title">{symbol}</h2>
+        </div>
+        <div className="psm-tabs" role="tablist" aria-label="Chart range">
+          {PERIODS.map((option) => (
+            <button
+              key={option.key}
+              type="button"
+              role="tab"
+              className={`psm-tab${period === option.key ? " active" : ""}`}
+              aria-selected={period === option.key}
+              onClick={() => onChangePeriod(option.key)}
+            >
+              {option.label}
+            </button>
+          ))}
+        </div>
+      </div>
+
+      <p className="psm-chart-meta">Chart loading is isolated from the rest of Overview. A history miss only affects this card.</p>
+
+      <div className="psm-chart-frame">
+        {chartState === "loading" ? <div className="psm-card-empty">Loading {period.toUpperCase()} history…</div> : null}
+        {chartState === "error" ? <div className="psm-card-empty psm-error-copy">{chartError || "Could not load chart history."}</div> : null}
+        {chartState === "ready" ? <PriceChart symbol={symbol} points={points} /> : null}
+      </div>
+    </section>
+  );
+}
+
diff --git a/frontend/components/prism/KPIStrip.tsx b/frontend/components/prism/KPIStrip.tsx
new file mode 100644
index 0000000..b3cd34c
--- /dev/null
+++ b/frontend/components/prism/KPIStrip.tsx
@@ -0,0 +1,16 @@
+import type { KpiItem } from "@/lib/overview";
+
+export function KPIStrip({ items }: { items: KpiItem[] }) {
+  return (
+    <section className="psm-card psm-kpis" aria-label="Key metrics">
+      {items.map((item) => (
+        <div className="psm-kpi" key={item.key}>
+          <span className="psm-kpi-key">{item.key}</span>
+          <span className={`psm-kpi-value${item.missing ? " missing" : ""}`}>{item.value}</span>
+          <span className="psm-kpi-sub">{item.sublabel}</span>
+        </div>
+      ))}
+    </section>
+  );
+}
+
diff --git a/frontend/components/prism/Sidebar.tsx b/frontend/components/prism/Sidebar.tsx
new file mode 100644
index 0000000..15a2947
--- /dev/null
+++ b/frontend/components/prism/Sidebar.tsx
@@ -0,0 +1,101 @@
+import Image from "next/image";
+import type { NavItem } from "@/lib/overview";
+import { deltaClass, fmtCurrency, fmtPct } from "@/lib/format";
+import { watchlistSubtitle } from "@/lib/overview";
+import type { WatchlistResponse } from "@/types/api";
+
+type Props = {
+  navItems: NavItem[];
+  selectedKey: string;
+  currentTicker: string;
+  watchlist: WatchlistResponse;
+  watchlistError: string | null;
+  onSelectTicker: (symbol: string) => void;
+  onRemoveTicker: (symbol: string) => void;
+};
+
+export function Sidebar({
+  navItems,
+  selectedKey,
+  currentTicker,
+  watchlist,
+  watchlistError,
+  onSelectTicker,
+  onRemoveTicker
+}: Props) {
+  return (
+    <aside className="psm-side">
+      <div className="psm-brand">
+        <Image className="psm-brand-mark" src="/design-system/logo-monogram.svg" alt="" width={34} height={34} />
+        <div className="psm-brand-copy">
+          <div className="psm-brand-name">Prism</div>
+          <div className="psm-brand-sub">Market Workbench</div>
+        </div>
+      </div>
+
+      <div className="psm-side-section">
+        <div className="psm-side-label">Workspace</div>
+      </div>
+
+      <nav className="psm-nav" aria-label="Primary">
+        {navItems.map((item) => {
+          const active = item.key === selectedKey;
+          return (
+            <button
+              key={item.key}
+              type="button"
+              className={`psm-nav-item${active ? " active" : ""}${item.disabled ? " disabled" : ""}`}
+              aria-disabled={item.disabled ? "true" : undefined}
+            >
+              <span className={`psm-icon icon-${item.icon}`} aria-hidden />
+              <span className="psm-nav-copy">
+                <span>{item.label}</span>
+                {item.disabled ? <span className="psm-nav-coming">Soon</span> : null}
+              </span>
+            </button>
+          );
+        })}
+      </nav>
+
+      <div className="psm-side-section">
+        <div className="psm-side-label">Watchlist</div>
+      </div>
+
+      <div className="psm-watch">
+        <div className="psm-watch-toolbar">
+          <div className="psm-watch-limit">
+            {watchlist.items.length}/{watchlist.limit}
+          </div>
+        </div>
+
+        {watchlist.items.length === 0 ? <div className="psm-watch-empty">Saved tickers will appear here.</div> : null}
+
+        {watchlist.items.map((item) => {
+          const active = item.symbol === currentTicker;
+          return (
+            <div key={item.symbol} className={`psm-watch-row${active ? " active" : ""}`}>
+              <button type="button" className="psm-watch-select" onClick={() => onSelectTicker(item.symbol)}>
+                <span className="psm-watch-main">
+                  <span className="psm-watch-symbol">{item.symbol}</span>
+                  <span className="psm-watch-date">{watchlistSubtitle(item)}</span>
+                </span>
+                <span className="psm-watch-price">{fmtCurrency(item.quote?.price)}</span>
+                <span className={`psm-watch-change ${deltaClass(item.quote?.change_pct)}`}>{fmtPct(item.quote?.change_pct, 2, true)}</span>
+              </button>
+              <button
+                type="button"
+                aria-label={`Remove ${item.symbol} from watchlist`}
+                className="psm-watch-remove"
+                onClick={() => onRemoveTicker(item.symbol)}
+              >
+                ×
+              </button>
+            </div>
+          );
+        })}
+
+        {watchlistError ? <p className="psm-muted-copy psm-error-copy">{watchlistError}</p> : null}
+      </div>
+    </aside>
+  );
+}
diff --git a/frontend/components/prism/TickerHeader.tsx b/frontend/components/prism/TickerHeader.tsx
new file mode 100644
index 0000000..23254f8
--- /dev/null
+++ b/frontend/components/prism/TickerHeader.tsx
@@ -0,0 +1,51 @@
+import { deltaClass, fmtCurrency, fmtPct } from "@/lib/format";
+import { buildIdentityLine, rangePercent } from "@/lib/overview";
+import type { TickerOverview } from "@/types/api";
+
+type Props = {
+  overview: TickerOverview;
+  onToggleWatchlist: () => void;
+  isSaved: boolean;
+};
+
+export function TickerHeader({ overview, onToggleWatchlist, isSaved }: Props) {
+  const pct = rangePercent(overview);
+
+  return (
+    <header className="psm-ticker-head">
+      <div className="psm-header-left">
+        <span className="psm-identity-line psm-eyebrow">{overview.profile.symbol}</span>
+        <div className="psm-heading-row">
+          <span className="psm-symbol">{overview.profile.symbol}</span>
+          <span className="psm-company-name">{overview.profile.name || "Name unavailable"}</span>
+          {overview.meta.is_partial ? <span className="psm-partial-chip">Partial Data</span> : null}
+        </div>
+        <p className="psm-subline">{buildIdentityLine(overview)}</p>
+      </div>
+
+      <div className="psm-range">
+        <div className="psm-eyebrow">52 Week Range</div>
+        <div className="psm-range-values">
+          <span>{fmtCurrency(overview.range_52w.low)}</span>
+          <span>{fmtCurrency(overview.range_52w.price ?? overview.quote.price)}</span>
+          <span>{fmtCurrency(overview.range_52w.high)}</span>
+        </div>
+        <div className="psm-range-rail" aria-hidden>
+          {pct != null ? <span className="psm-range-indicator" style={{ left: `${pct}%` }} /> : null}
+        </div>
+      </div>
+
+      <div className="psm-price-stack">
+        <span className="psm-price">{fmtCurrency(overview.quote.price)}</span>
+        <span className={`psm-change ${deltaClass(overview.quote.change_pct)}`}>
+          {fmtCurrency(overview.quote.change)} · {fmtPct(overview.quote.change_pct, 2, true)}
+        </span>
+        <span className="psm-quote-line">Prev close {fmtCurrency(overview.quote.prev_close)}</span>
+        <button type="button" className={`psm-primary-action${isSaved ? " subtle" : ""}`} onClick={onToggleWatchlist}>
+          {isSaved ? "Remove From Watchlist" : "Save To Watchlist"}
+        </button>
+      </div>
+    </header>
+  );
+}
+
diff --git a/frontend/components/prism/TopBar.tsx b/frontend/components/prism/TopBar.tsx
new file mode 100644
index 0000000..38e8447
--- /dev/null
+++ b/frontend/components/prism/TopBar.tsx
@@ -0,0 +1,61 @@
+import type { FormEvent } from "react";
+import type { SearchResult } from "@/types/api";
+
+type Props = {
+  query: string;
+  searching: boolean;
+  results: SearchResult[];
+  marketStatus: { isOpen: boolean; status: string; time: string };
+  onChangeQuery: (value: string) => void;
+  onSubmit: (event: FormEvent<HTMLFormElement>) => void;
+  onSelectTicker: (symbol: string) => void;
+};
+
+export function TopBar({ query, searching, results, marketStatus, onChangeQuery, onSubmit, onSelectTicker }: Props) {
+  const showDropdown = query.trim().length >= 2;
+
+  return (
+    <header className="psm-top">
+      <div className="psm-search-shell">
+        <form className="psm-search-form" onSubmit={onSubmit}>
+          <span className="psm-icon icon-search" aria-hidden />
+          <input value={query} onChange={(event) => onChangeQuery(event.target.value)} placeholder="Search ticker or company" aria-label="Search ticker" />
+          <span className="psm-kbd">Enter</span>
+        </form>
+
+        {showDropdown ? (
+          <div className="psm-search-dropdown">
+            {searching ? <div className="psm-search-status">Searching...</div> : null}
+            {!searching && results.length === 0 ? <div className="psm-search-status">No matches</div> : null}
+            {!searching
+              ? results.map((result) => (
+                  <button key={`${result.symbol}-${result.exchange}`} type="button" className="psm-search-result" onClick={() => onSelectTicker(result.symbol)}>
+                    <span className="psm-search-result-symbol">{result.symbol}</span>
+                    <span className="psm-search-result-copy">
+                      {result.name}
+                      {result.exchange ? ` · ${result.exchange}` : ""}
+                    </span>
+                  </button>
+                ))
+              : null}
+          </div>
+        ) : null}
+      </div>
+
+      <div className="psm-clock-group">
+        <div className="psm-market-status">
+          <span className={`psm-market-dot${marketStatus.isOpen ? " open" : ""}`} aria-hidden />
+          <span>{marketStatus.status}</span>
+          <span>{marketStatus.time}</span>
+        </div>
+
+        <div className="psm-account">
+          <span className="psm-icon icon-user" aria-hidden />
+          <span className="psm-account-avatar">T</span>
+          <span>Local Profile</span>
+        </div>
+      </div>
+    </header>
+  );
+}
+