diff --git a/frontend/src/platform/ClassroomTab.jsx b/frontend/src/platform/ClassroomTab.jsx
new file mode 100644
index 0000000..cf125c2
--- /dev/null
+++ b/frontend/src/platform/ClassroomTab.jsx
@@ -0,0 +1,146 @@
+import { useState, useEffect, useCallback, useRef } from 'react'
+import { api } from './api'
+import styles from './Platform.module.css'
+
+const HEARTBEAT_MS = 25000  // §15 — "browser heartbeat every 20-30 seconds"
+const POLL_MS = 5000
+
+const HELP_CATEGORIES = [
+  { value: 'lab_problem', label: 'Lab problem' },
+  { value: 'dont_understand', label: "Don't understand the task" },
+  { value: 'validation_failing', label: 'Validation failing' },
+  { value: 'other', label: 'Other' },
+]
+
+// Phase 5A §22 — the live classroom experience. No live classroom -> a quiet "nothing live
+// right now" state. Live -> title, current activity (guidance only — a link into the student's
+// own Lab, never an auto-redirect), announcements, Need Help, and the student's own Lab status
+// (reusing the exact same /api/environment/* the My Learning tab uses — no second Lab-status
+// system). Heartbeats fire only while this tab is mounted and a classroom is actually joined.
+export default function ClassroomTab() {
+  const [live, setLive] = useState(null)
+  const [detail, setDetail] = useState(null)
+  const [envStatus, setEnvStatus] = useState(null)
+  const [joined, setJoined] = useState(false)
+  const [helpCategory, setHelpCategory] = useState('lab_problem')
+  const [helpMessage, setHelpMessage] = useState('')
+  const [helpSent, setHelpSent] = useState(false)
+  const [error, setError] = useState(null)
+  const heartbeatRef = useRef(null)
+  const pollRef = useRef(null)
+
+  const loadLive = useCallback(() => {
+    api.liveClassroom().then((r) => setLive(r.classroom)).catch((e) => setError(e.message))
+  }, [])
+  useEffect(() => { loadLive() }, [loadLive])
+
+  const loadDetail = useCallback((id) => {
+    api.classroom(id).then(setDetail).catch((e) => setError(e.message))
+    api.environmentStatus().then(setEnvStatus).catch(() => {})
+  }, [])
+
+  useEffect(() => {
+    if (!live) return
+    loadDetail(live.classroom_session_id)
+    pollRef.current = setInterval(() => loadDetail(live.classroom_session_id), POLL_MS)
+    return () => clearInterval(pollRef.current)
+  }, [live, loadDetail])
+
+  useEffect(() => {
+    if (!joined || !live) return
+    heartbeatRef.current = setInterval(() => api.classroomHeartbeat(live.classroom_session_id).catch(() => {}), HEARTBEAT_MS)
+    api.classroomHeartbeat(live.classroom_session_id).catch(() => {}) // one immediately on join, not just after the first interval
+    return () => clearInterval(heartbeatRef.current)
+  }, [joined, live])
+
+  const join = async () => {
+    try { await api.joinClassroom(live.classroom_session_id); setJoined(true) }
+    catch (e) { setError(e.message) }
+  }
+
+  const sendHelp = async (e) => {
+    e.preventDefault()
+    try {
+      await api.requestHelp(live.classroom_session_id, helpCategory, helpMessage)
+      setHelpSent(true); setHelpMessage('')
+    } catch (e) { setError(e.message) }
+  }
+
+  const launchLab = async () => {
+    try { setEnvStatus(await api.launchEnvironment()) } catch (e) { setError(e.message) }
+  }
+
+  if (!live) {
+    return (
+      <div className={styles.card}>
+        <h2>Classroom</h2>
+        <p className={styles.muted}>No live class right now. Check back at your scheduled class time.</p>
+      </div>
+    )
+  }
+
+  return (
+    <div>
+      <div className={styles.card}>
+        <p className={styles.livePill}>LIVE NOW</p>
+        <h2 style={{ margin: '0.4rem 0' }}>{live.title}</h2>
+        {live.description && <p className={styles.muted}>{live.description}</p>}
+        {live.meeting_url && (
+          <p><a className={styles.primaryBtn} href={live.meeting_url} target="_blank" rel="noreferrer">Join Video Class</a></p>
+        )}
+        {!joined ? (
+          <button className={styles.primaryBtn} onClick={join}>Join Classroom</button>
+        ) : (
+          <p className={styles.muted}>You're in this classroom.</p>
+        )}
+      </div>
+
+      {joined && detail && (
+        <>
+          {detail.classroom.current_scenario_id && (
+            <div className={styles.card}>
+              <h3>Current class activity</h3>
+              <p>{detail.classroom.current_scenario_id}</p>
+              <p className={styles.muted}>Open it from the My Learning tab when you're ready — nothing here jumps you there automatically.</p>
+            </div>
+          )}
+
+          <div className={styles.card}>
+            <h3>Your Lab</h3>
+            {envStatus?.status === 'running'
+              ? <p><a className={styles.primaryBtn} href={envStatus.launch_path}>Open Lab</a></p>
+              : <button className={styles.primaryBtn} onClick={launchLab} disabled={envStatus?.status === 'provisioning'}>
+                  {envStatus?.status === 'provisioning' ? 'Starting…' : 'Launch Lab'}
+                </button>}
+          </div>
+
+          <div className={styles.card}>
+            <h3>Announcements</h3>
+            {!detail.announcements.length ? <p className={styles.muted}>None yet.</p> : (
+              <ul>
+                {detail.announcements.map((a) => <li key={a.announcement_id}>{a.message}</li>)}
+              </ul>
+            )}
+          </div>
+
+          <div className={styles.card}>
+            <h3>Need help?</h3>
+            {helpSent ? <p className={styles.muted}>Help requested — your instructor has been notified.</p> : (
+              <form onSubmit={sendHelp}>
+                <label className={styles.label}>What's going on?</label>
+                <select className={styles.select} value={helpCategory} onChange={(e) => setHelpCategory(e.target.value)}>
+                  {HELP_CATEGORIES.map((c) => <option key={c.value} value={c.value}>{c.label}</option>)}
+                </select>
+                <label className={styles.label}>Details (optional)</label>
+                <input className={styles.input} value={helpMessage} onChange={(e) => setHelpMessage(e.target.value)} />
+                <button className={styles.primaryBtn} type="submit">Need Help</button>
+              </form>
+            )}
+          </div>
+        </>
+      )}
+
+      {error && <div className={styles.errorBox}>{error}</div>}
+    </div>
+  )
+}
diff --git a/frontend/src/platform/ForgotPasswordScreen.jsx b/frontend/src/platform/ForgotPasswordScreen.jsx
new file mode 100644
index 0000000..59729cb
--- /dev/null
+++ b/frontend/src/platform/ForgotPasswordScreen.jsx
@@ -0,0 +1,59 @@
+import { useState } from 'react'
+import { api } from './api'
+import styles from './Platform.module.css'
+
+// Phase 5A §6/§9 — self-service reset REQUEST. No email delivery exists yet
+// (docs/PHASE5A_STUDENT_IDENTITY_REMOTE_CLASSROOM.md §5) — this always shows the same generic
+// message regardless of whether the identifier exists (anti-enumeration, matches the server's
+// own response shape exactly). In dev/test, the server includes dev_reset_token in its
+// response so this screen can offer a direct link — a real deployment omits it, and completing
+// the flow needs an instructor to run the admin-side reset instead (see
+// docs/RUNBOOK_RESET_STUDENT_PASSWORD.md).
+export default function ForgotPasswordScreen({ onCancel, onHaveToken }) {
+  const [identifier, setIdentifier] = useState('')
+  const [sent, setSent] = useState(null)
+  const [loading, setLoading] = useState(false)
+
+  const submit = async (e) => {
+    e.preventDefault()
+    setLoading(true)
+    try {
+      const result = await api.requestPasswordReset(identifier)
+      setSent(result)
+    } finally {
+      setLoading(false)
+    }
+  }
+
+  return (
+    <div className={styles.entryWrap}>
+      <div className={styles.entryCard}>
+        <div className={styles.brand}>
+          <span className={styles.brandIcon}>⎈</span> RootNode Academy
+        </div>
+        <p className={styles.tagline}>Reset your password</p>
+
+        {!sent ? (
+          <form onSubmit={submit}>
+            <label className={styles.label}>Email or login</label>
+            <input className={styles.input} type="text" value={identifier} onChange={(e) => setIdentifier(e.target.value)} required />
+            <button className={styles.primaryBtn} type="submit" disabled={loading}>{loading ? 'Sending…' : 'Send reset link'}</button>
+          </form>
+        ) : (
+          <>
+            <p style={{ color: 'var(--text-2)', fontSize: '0.9rem' }}>{sent.message}</p>
+            {sent.dev_reset_token && (
+              <p style={{ fontSize: '0.8rem', color: 'var(--text-3)' }}>
+                Dev/test only (never shown in production):{' '}
+                <button className={styles.linkBtn} onClick={() => onHaveToken(sent.dev_reset_token)}>use this reset token</button>
+              </p>
+            )}
+          </>
+        )}
+        <p style={{ marginTop: '1rem', textAlign: 'center' }}>
+          <button className={styles.linkBtn} onClick={onCancel}>Back to sign in</button>
+        </p>
+      </div>
+    </div>
+  )
+}
diff --git a/frontend/src/platform/LoginScreen.jsx b/frontend/src/platform/LoginScreen.jsx
new file mode 100644
index 0000000..0643a1c
--- /dev/null
+++ b/frontend/src/platform/LoginScreen.jsx
@@ -0,0 +1,63 @@
+import { useState } from 'react'
+import { api } from './api'
+import styles from './Platform.module.css'
+
+// Phase 5A §6 — the real, credentialed student login. This is now the default entry point
+// (see PlatformShell.jsx); EntryScreen (pilot, no password) is still reachable for
+// not-yet-converted accounts via the link at the bottom, not removed — see
+// docs/PHASE5A_STUDENT_IDENTITY_REMOTE_CLASSROOM.md §7.
+export default function LoginScreen({ onLogin, onShowPilotEntry, onShowForgotPassword }) {
+  const [identifier, setIdentifier] = useState('')
+  const [password, setPassword] = useState('')
+  const [loading, setLoading] = useState(false)
+  const [error, setError] = useState(null)
+
+  const handleLogin = async (e) => {
+    e.preventDefault()
+    if (!identifier || !password) return
+    setLoading(true)
+    setError(null)
+    try {
+      const student = await api.studentLogin(identifier, password)
+      onLogin(student)
+    } catch (err) {
+      setError(err.message)
+    } finally {
+      setLoading(false)
+    }
+  }
+
+  return (
+    <div className={styles.entryWrap}>
+      <div className={styles.entryCard}>
+        <div className={styles.brand}>
+          <span className={styles.brandIcon}>⎈</span> RootNode Academy
+        </div>
+        <p className={styles.tagline}>Sign in to continue your learning.</p>
+
+        {error && <div className={styles.errorBox}>{error}</div>}
+
+        <form onSubmit={handleLogin}>
+          <label className={styles.label}>Email or login</label>
+          <input className={styles.input} type="text" autoComplete="username" value={identifier}
+            onChange={(e) => setIdentifier(e.target.value)} required />
+
+          <label className={styles.label}>Password</label>
+          <input className={styles.input} type="password" autoComplete="current-password" value={password}
+            onChange={(e) => setPassword(e.target.value)} required />
+
+          <button className={styles.primaryBtn} type="submit" disabled={loading}>
+            {loading ? 'Signing in…' : 'Sign in'}
+          </button>
+        </form>
+
+        <p style={{ marginTop: '1rem', textAlign: 'center' }}>
+          <button className={styles.linkBtn} onClick={onShowForgotPassword}>Forgot password?</button>
+        </p>
+        <p style={{ marginTop: '0.5rem', textAlign: 'center' }}>
+          <button className={styles.linkBtn} onClick={onShowPilotEntry}>Pick your name instead (pilot cohorts)</button>
+        </p>
+      </div>
+    </div>
+  )
+}
diff --git a/frontend/src/platform/Platform.module.css b/frontend/src/platform/Platform.module.css
index 32a8cf9..810c114 100644
--- a/frontend/src/platform/Platform.module.css
+++ b/frontend/src/platform/Platform.module.css
@@ -36,7 +36,7 @@
 
 .label { display: block; font-size: 0.8rem; color: var(--text-2); margin: 0.9rem 0 0.3rem; }
 
-.select {
+.select, .input {
   width: 100%;
   padding: 0.55rem 0.6rem;
   background: var(--surface2);
@@ -45,6 +45,7 @@
   color: var(--text);
   font-family: var(--sans);
   font-size: 0.9rem;
+  box-sizing: border-box;
 }
 
 .primaryBtn {
@@ -179,5 +180,12 @@ table.dataTable { width: 100%; border-collapse: collapse; font-size: 0.85rem; }
 .pillErr { background: var(--red-dim); color: var(--red); }
 .pillMuted { background: var(--surface3); color: var(--text-2); }
 
+/* Phase 5A — classroom/profile screens */
+.livePill {
+  display: inline-block; background: var(--red-dim); color: var(--red); font-family: var(--mono);
+  font-size: 0.72rem; font-weight: 700; letter-spacing: 0.05em; padding: 0.2rem 0.6rem; border-radius: 999px;
+}
+.pager { display: flex; align-items: center; gap: 0.75rem; margin-top: 0.75rem; }
+
 .lockedBox { text-align: center; padding: 2rem 1rem; color: var(--text-2); }
 .checklistItem { display: flex; align-items: center; gap: 0.5rem; padding: 0.35rem 0; font-size: 0.88rem; }
diff --git a/frontend/src/platform/PlatformShell.jsx b/frontend/src/platform/PlatformShell.jsx
index e479f04..5b51131 100644
--- a/frontend/src/platform/PlatformShell.jsx
+++ b/frontend/src/platform/PlatformShell.jsx
@@ -1,17 +1,28 @@
 import { useState, useEffect } from 'react'
 import { api, getCachedDisplay } from './api'
+import LoginScreen from './LoginScreen'
 import EntryScreen from './EntryScreen'
+import SetPasswordScreen from './SetPasswordScreen'
+import ForgotPasswordScreen from './ForgotPasswordScreen'
 import StudentDashboard from './StudentDashboard'
 
-// Top-level Platform Shell: entry screen if no valid session, dashboard otherwise. Session
-// validity is decided by the server (GET /api/session/whoami against the rn_session cookie),
-// not by anything read from localStorage/sessionStorage — those only cache the display name
-// for a snappier first paint, per api.js.
+// Top-level Platform Shell. Phase 5A: the credentialed LoginScreen is now the default entry
+// point (was EntryScreen's pilot name-picker); an activation/reset link
+// (?activate=<token> or ?reset=<token>) short-circuits straight to SetPasswordScreen before
+// any session check, since neither flow requires an existing session. Session validity is
+// still decided by the server (GET /api/session/whoami against the rn_session cookie), not by
+// anything read from localStorage/sessionStorage.
 export default function PlatformShell() {
   const [student, setStudent] = useState(null)
   const [checking, setChecking] = useState(true)
+  const params = new URLSearchParams(window.location.search)
+  const [view, setView] = useState(
+    params.get('activate') ? 'activate' : params.get('reset') ? 'reset' : 'login'
+  )
+  const [resetToken, setResetToken] = useState(params.get('reset') || null)
 
   useEffect(() => {
+    if (view === 'activate' || view === 'reset') { setChecking(false); return }
     const cached = getCachedDisplay()
     if (cached) setStudent(cached) // optimistic paint while we confirm with the server
     api.whoami()
@@ -20,9 +31,29 @@ export default function PlatformShell() {
       })
       .catch(() => setStudent(null))
       .finally(() => setChecking(false))
-  }, [])
+  }, [view])
 
   if (checking) return null
-  if (!student) return <EntryScreen onLogin={setStudent} />
-  return <StudentDashboard student={student} onLogout={() => setStudent(null)} />
+
+  if (view === 'activate') {
+    return <SetPasswordScreen token={params.get('activate')} purpose="activation"
+      onDone={(s) => { setStudent(s); setView('dashboard'); window.history.replaceState({}, '', '/') }}
+      onCancel={() => { setView('login'); window.history.replaceState({}, '', '/') }} />
+  }
+  if (view === 'reset') {
+    return <SetPasswordScreen token={resetToken} purpose="reset"
+      onDone={() => { setView('login'); window.history.replaceState({}, '', '/') }}
+      onCancel={() => { setView('login'); window.history.replaceState({}, '', '/') }} />
+  }
+  if (view === 'forgot') {
+    return <ForgotPasswordScreen onCancel={() => setView('login')} onHaveToken={(t) => { setResetToken(t); setView('reset') }} />
+  }
+  if (view === 'pilot') {
+    return <EntryScreen onLogin={(s) => { setStudent(s); setView('dashboard') }} />
+  }
+  if (!student) {
+    return <LoginScreen onLogin={(s) => { setStudent(s); setView('dashboard') }}
+      onShowPilotEntry={() => setView('pilot')} onShowForgotPassword={() => setView('forgot')} />
+  }
+  return <StudentDashboard student={student} onLogout={() => { setStudent(null); setView('login') }} />
 }
diff --git a/frontend/src/platform/ProfileTab.jsx b/frontend/src/platform/ProfileTab.jsx
new file mode 100644
index 0000000..c9b55f1
--- /dev/null
+++ b/frontend/src/platform/ProfileTab.jsx
@@ -0,0 +1,91 @@
+import { useState, useEffect } from 'react'
+import { api } from './api'
+import styles from './Platform.module.css'
+
+// Phase 5A §10 — minimal account/profile page. Deliberately narrow: identity, cohort, progress
+// summary, achievements, active session count, and change-password. No social/profile features.
+export default function ProfileTab() {
+  const [profile, setProfile] = useState(null)
+  const [error, setError] = useState(null)
+
+  useEffect(() => { api.profile().then(setProfile).catch((e) => setError(e.message)) }, [])
+
+  if (error) return <div className={styles.errorBox}>{error}</div>
+  if (!profile) return <p className={styles.muted}>Loading…</p>
+
+  return (
+    <div>
+      <div className={styles.card}>
+        <h2>Account</h2>
+        <p><strong>{profile.student.display_name}</strong></p>
+        <p className={styles.muted}>{profile.student.email || profile.student.login_identifier || 'No login identifier set'}</p>
+        <p className={styles.muted}>
+          {profile.cohorts.length ? profile.cohorts.map((c) => c.name).join(', ') : 'Not enrolled in a cohort yet'}
+        </p>
+        <p className={styles.muted}>{profile.active_sessions} active session{profile.active_sessions === 1 ? '' : 's'}</p>
+      </div>
+
+      <div className={styles.card}>
+        <h2>Progress</h2>
+        <p>{profile.progress_summary.completed} / {profile.progress_summary.total} scenarios completed</p>
+        <div className={styles.progressBarTrack}>
+          <div className={styles.progressBarFill} style={{ width: `${profile.progress_summary.total ? Math.round(100 * profile.progress_summary.completed / profile.progress_summary.total) : 0}%` }} />
+        </div>
+      </div>
+
+      <div className={styles.card}>
+        <h2>Achievements</h2>
+        {!profile.achievements.length ? <p className={styles.muted}>None yet — keep going!</p> : (
+          <ul>
+            {profile.achievements.map((a, i) => (
+              <li key={i}>{a.achievement_type.replace(/_/g, ' ')}{a.stage_id ? ` — ${a.stage_id}` : ''}</li>
+            ))}
+          </ul>
+        )}
+      </div>
+
+      <ChangePasswordCard hasCredentials={profile.student.has_credentials} />
+    </div>
+  )
+}
+
+function ChangePasswordCard({ hasCredentials }) {
+  const [oldPassword, setOldPassword] = useState('')
+  const [newPassword, setNewPassword] = useState('')
+  const [busy, setBusy] = useState(false)
+  const [notice, setNotice] = useState(null)
+  const [error, setError] = useState(null)
+
+  if (!hasCredentials) {
+    return (
+      <div className={styles.card}>
+        <h2>Change password</h2>
+        <p className={styles.muted}>This is still a pilot account with no password set. Ask your instructor to convert it to a real account first.</p>
+      </div>
+    )
+  }
+
+  const submit = async (e) => {
+    e.preventDefault()
+    setBusy(true); setError(null); setNotice(null)
+    try {
+      await api.changePassword(oldPassword, newPassword)
+      setNotice('Password updated.'); setOldPassword(''); setNewPassword('')
+    } catch (err) { setError(err.message) } finally { setBusy(false) }
+  }
+
+  return (
+    <div className={styles.card}>
+      <h2>Change password</h2>
+      {error && <div className={styles.errorBox}>{error}</div>}
+      {notice && <p className={styles.muted}>{notice}</p>}
+      <form onSubmit={submit}>
+        <label className={styles.label}>Current password</label>
+        <input className={styles.input} type="password" autoComplete="current-password" value={oldPassword} onChange={(e) => setOldPassword(e.target.value)} required />
+        <label className={styles.label}>New password</label>
+        <input className={styles.input} type="password" autoComplete="new-password" value={newPassword} onChange={(e) => setNewPassword(e.target.value)} required minLength={10} />
+        <button className={styles.primaryBtn} type="submit" disabled={busy}>{busy ? 'Saving…' : 'Update password'}</button>
+      </form>
+    </div>
+  )
+}
diff --git a/frontend/src/platform/SetPasswordScreen.jsx b/frontend/src/platform/SetPasswordScreen.jsx
new file mode 100644
index 0000000..544c542
--- /dev/null
+++ b/frontend/src/platform/SetPasswordScreen.jsx
@@ -0,0 +1,76 @@
+import { useState, useEffect } from 'react'
+import { api } from './api'
+import styles from './Platform.module.css'
+
+// Phase 5A §5/§6 — one screen for both flows the credential token mechanism serves:
+// activation (first login, purpose='activation') and forgot-password (purpose='reset'). Same
+// UI, different API call and success copy.
+export default function SetPasswordScreen({ token, purpose, onDone, onCancel }) {
+  const [preview, setPreview] = useState(null)
+  const [previewError, setPreviewError] = useState(null)
+  const [password, setPassword] = useState('')
+  const [confirm, setConfirm] = useState('')
+  const [loading, setLoading] = useState(false)
+  const [error, setError] = useState(null)
+
+  useEffect(() => {
+    api.credentialTokenPreview(purpose, token).then(setPreview).catch((e) => setPreviewError(e.message))
+  }, [token, purpose])
+
+  const submit = async (e) => {
+    e.preventDefault()
+    if (password.length < 10) { setError('Password must be at least 10 characters.'); return }
+    if (password !== confirm) { setError('Passwords do not match.'); return }
+    setLoading(true)
+    setError(null)
+    try {
+      if (purpose === 'activation') {
+        const student = await api.activate(token, password)
+        onDone(student)
+      } else {
+        await api.resetPassword(token, password)
+        onDone(null) // reset doesn't log the browser in — every existing session was revoked, sign in fresh
+      }
+    } catch (err) {
+      setError(err.message)
+    } finally {
+      setLoading(false)
+    }
+  }
+
+  return (
+    <div className={styles.entryWrap}>
+      <div className={styles.entryCard}>
+        <div className={styles.brand}>
+          <span className={styles.brandIcon}>⎈</span> RootNode Academy
+        </div>
+        <p className={styles.tagline}>{purpose === 'activation' ? 'Set up your account' : 'Choose a new password'}</p>
+
+        {previewError && (
+          <div className={styles.errorBox}>
+            This link is invalid or has expired. Ask your instructor for a new one.
+          </div>
+        )}
+        {preview && <p style={{ color: 'var(--text-2)', fontSize: '0.9rem' }}>Hi, {preview.display_name}.</p>}
+        {error && <div className={styles.errorBox}>{error}</div>}
+
+        {!previewError && (
+          <form onSubmit={submit}>
+            <label className={styles.label}>New password</label>
+            <input className={styles.input} type="password" autoComplete="new-password" value={password}
+              onChange={(e) => setPassword(e.target.value)} required minLength={10} />
+            <label className={styles.label}>Confirm password</label>
+            <input className={styles.input} type="password" autoComplete="new-password" value={confirm}
+              onChange={(e) => setConfirm(e.target.value)} required minLength={10} />
+            <button className={styles.primaryBtn} type="submit" disabled={loading}>
+              {loading ? 'Saving…' : purpose === 'activation' ? 'Activate my account' : 'Set new password'}
+            </button>
+          </form>
+        )}
+        <p style={{ marginTop: '1rem', textAlign: 'center' }}>
+          <button className={styles.linkBtn} onClick={onCancel}>Back to sign in</button>
+        </p>
+      </div>
+    </div>
+  )
+}
diff --git a/frontend/src/platform/StudentDashboard.jsx b/frontend/src/platform/StudentDashboard.jsx
index 2796188..cb09f54 100644
--- a/frontend/src/platform/StudentDashboard.jsx
+++ b/frontend/src/platform/StudentDashboard.jsx
@@ -6,13 +6,17 @@ import PracticeTab from './PracticeTab'
 import AssessmentsTab from './AssessmentsTab'
 import CapstoneTab from './CapstoneTab'
 import AchievementsTab from './AchievementsTab'
+import ClassroomTab from './ClassroomTab'
+import ProfileTab from './ProfileTab'
 
 const TABS = [
   { key: 'learning', label: 'My Learning' },
+  { key: 'classroom', label: 'Classroom' },
   { key: 'practice', label: 'Practice' },
   { key: 'assessments', label: 'Assessments' },
   { key: 'capstone', label: 'Capstone' },
   { key: 'achievements', label: 'Achievements' },
+  { key: 'profile', label: 'Profile' },
 ]
 
 // Student home — tabbed as of Phase 3B (docs/PHASE3B_LEARNING_AND_ASSESSMENT.md §10): My
@@ -41,10 +45,12 @@ export default function StudentDashboard({ student, onLogout }) {
       </nav>
 
       {tab === 'learning' && <MyLearningTab />}
+      {tab === 'classroom' && <ClassroomTab />}
       {tab === 'practice' && <PracticeTab />}
       {tab === 'assessments' && <AssessmentsTab />}
       {tab === 'capstone' && <CapstoneTab />}
       {tab === 'achievements' && <AchievementsTab />}
+      {tab === 'profile' && <ProfileTab />}
     </div>
   )
 }
diff --git a/frontend/src/platform/api.js b/frontend/src/platform/api.js
index 87884f0..5f6bfb9 100644
--- a/frontend/src/platform/api.js
+++ b/frontend/src/platform/api.js
@@ -83,4 +83,40 @@ export const api = {
   capstone: () => fetch('/api/capstone').then(json),
 
   achievements: () => fetch('/api/achievements').then(json),
+
+  // ── Phase 5A: real student accounts ─────────────────────────────────────────────────────
+  // No CSRF token for login/activate/reset-request/reset — same reasoning as the pilot login
+  // above: nothing authenticated exists yet to forge into.
+  studentLogin: async (identifier, password) => {
+    const { student } = await fetch('/api/student/login', {
+      method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify({ identifier, password }),
+    }).then(json)
+    cacheDisplay(student)
+    return student
+  },
+  activate: async (token, password) => {
+    const { student } = await fetch('/api/student/activate', {
+      method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify({ token, password }),
+    }).then(json)
+    cacheDisplay(student)
+    return student
+  },
+  credentialTokenPreview: (purpose, token) => fetch(`/api/student/credential-token/${purpose}?token=${encodeURIComponent(token)}`).then(json),
+  requestPasswordReset: (identifier) => fetch('/api/student/request-password-reset', {
+    method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify({ identifier }),
+  }).then(json),
+  resetPassword: (token, password) => fetch('/api/student/reset-password', {
+    method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify({ token, password }),
+  }).then(json),
+  changePassword: (old_password, new_password) => mutate('/api/student/change-password', { old_password, new_password }),
+  profile: () => fetch('/api/student/profile').then(json),
+
+  // ── Phase 5A: remote classroom ───────────────────────────────────────────────────────────
+  liveClassroom: () => fetch('/api/classroom/live').then(json),
+  classroom: (id) => fetch(`/api/classroom/${id}`).then(json),
+  classroomAnnouncements: (id) => fetch(`/api/classroom/${id}/announcements`).then(json),
+  joinClassroom: (id) => mutate(`/api/classroom/${id}/join`),
+  leaveClassroom: (id) => mutate(`/api/classroom/${id}/leave`),
+  classroomHeartbeat: (id) => mutate(`/api/classroom/${id}/heartbeat`),
+  requestHelp: (id, category, message) => mutate(`/api/classroom/${id}/help-request`, { category, message }),
 }