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HTML
<div class="shell">

  <!-- Sidebar -->
  <nav class="sidebar">
    <div class="sidebar-brand">Atelier<br><span>Studio</span></div>
    <div class="nav-label">Navigation</div>
    <button class="nav-link active" data-target="home">
      <span class="nav-dot"></span> Overview
    </button>
    <button class="nav-link" data-target="collection">
      <span class="nav-dot"></span> Collection
    </button>
    <button class="nav-link" data-target="analytics">
      <span class="nav-dot"></span> Analytics
    </button>
    <button class="nav-link" data-target="settings">
      <span class="nav-dot"></span> Settings
    </button>
  </nav>

  <!-- Page Stack -->
  <main class="page-stack">

    <!-- Home -->
    <section class="page active" id="home">
      <div class="page-eyebrow">Welcome back</div>
      <h1 class="page-title">Good morning,<br><em>Constance.</em></h1>
      <p class="page-body">Your studio has 3 new inquiries and 2 pending approvals. The autumn collection launches in 12 days — everything is on track.</p>
      <div class="badge">New season ready</div>
      <div class="card-grid">
        <div class="card">
          <div class="card-img" style="background:#f0ebe0">🎨</div>
          <div class="card-info"><h3>Design Review</h3><p>Due tomorrow</p></div>
        </div>
        <div class="card">
          <div class="card-img" style="background:#e8f0ed">📦</div>
          <div class="card-info"><h3>Shipment #44</h3><p>In transit</p></div>
        </div>
        <div class="card">
          <div class="card-img" style="background:#f0e8e8">✉️</div>
          <div class="card-info"><h3>3 Inquiries</h3><p>Unread</p></div>
        </div>
      </div>
    </section>

    <!-- Collection -->
    <section class="page" id="collection">
      <div class="page-eyebrow">Autumn / Winter 2024</div>
      <h1 class="page-title">The<br><em>Collection</em></h1>
      <p class="page-body">Twelve pieces exploring the tension between restraint and excess. Hand-finished in our Milan atelier using deadstock fabrics sourced from Lyon.</p>
      <div class="card-grid">
        <div class="card">
          <div class="card-img" style="background:#2a241c;color:white">01</div>
          <div class="card-info"><h3>Overcoat Noir</h3><p>€2,400 · 4 left</p></div>
        </div>
        <div class="card">
          <div class="card-img" style="background:#c9a84c;color:white">02</div>
          <div class="card-info"><h3>Blazer Doré</h3><p>€1,800 · 2 left</p></div>
        </div>
        <div class="card">
          <div class="card-img" style="background:#8a7e6e;color:white">03</div>
          <div class="card-info"><h3>Trouser Taupe</h3><p>€980 · 8 left</p></div>
        </div>
        <div class="card">
          <div class="card-img" style="background:#e8e2d8">04</div>
          <div class="card-info"><h3>Shirt Ivoire</h3><p>€640 · 12 left</p></div>
        </div>
      </div>
    </section>

    <!-- Analytics -->
    <section class="page" id="analytics">
      <div class="page-eyebrow">Season performance</div>
      <h1 class="page-title">Analytics<br><em>& Insights</em></h1>
      <div class="stat-row">
        <div class="stat-box">
          <div class="stat-num">94k</div>
          <div class="stat-label">Revenue</div>
        </div>
        <div class="stat-box">
          <div class="stat-num">38</div>
          <div class="stat-label">Orders</div>
        </div>
        <div class="stat-box">
          <div class="stat-num">4.9</div>
          <div class="stat-label">Avg Rating</div>
        </div>
      </div>
      <p class="page-body">Revenue is up 22% versus the same period last year. The Overcoat Noir continues to be your strongest performer, accounting for 41% of total sales.</p>
    </section>

    <!-- Settings -->
    <section class="page" id="settings">
      <div class="page-eyebrow">Account</div>
      <h1 class="page-title">Settings &<br><em>Preferences</em></h1>
      <div class="setting-row">
        <div>
          <div class="setting-label">Email Notifications</div>
          <div class="setting-desc">Receive alerts for new orders and inquiries</div>
        </div>
        <div class="toggle on" onclick="this.classList.toggle('on')"></div>
      </div>
      <div class="setting-row">
        <div>
          <div class="setting-label">Two-factor Authentication</div>
          <div class="setting-desc">Extra layer of security for your account</div>
        </div>
        <div class="toggle on" onclick="this.classList.toggle('on')"></div>
      </div>
      <div class="setting-row">
        <div>
          <div class="setting-label">Public Profile</div>
          <div class="setting-desc">Make your studio visible in directory listings</div>
        </div>
        <div class="toggle" onclick="this.classList.toggle('on')"></div>
      </div>
      <div class="setting-row">
        <div>
          <div class="setting-label">Beta Features</div>
          <div class="setting-desc">Access experimental features before public launch</div>
        </div>
        <div class="toggle" onclick="this.classList.toggle('on')"></div>
      </div>
    </section>

  </main>
</div>
CSS
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

  :root {
    --cream: #f5f0e8;
    --ink:   #1a1410;
    --gold:  #c9a84c;
    --muted: #8a7e6e;
    --card-bg: #fff;
    --transition-dur: 600ms;
    --transition-ease: cubic-bezier(0.4, 0, 0.2, 1);
  }

  html, body { height: 100%; font-family: 'DM Sans', sans-serif; background: var(--cream); color: var(--ink); overflow: hidden; }

  /* Layout */
  .shell {
    display: grid;
    grid-template-columns: 260px 1fr;
    height: 100vh;
  }

  /* Sidebar nav */
  .sidebar {
    background: var(--ink);
    padding: 48px 32px;
    display: flex;
    flex-direction: column;
    gap: 0;
  }

  .sidebar-brand {
    font-family: 'Cormorant Garamond', serif;
    font-size: 22px;
    font-weight: 300;
    color: var(--cream);
    letter-spacing: 0.08em;
    margin-bottom: 56px;
    line-height: 1.3;
  }
  .sidebar-brand span { color: var(--gold); }

  .nav-label {
    font-size: 9px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--muted);
    margin-bottom: 16px;
  }

  .nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 0;
    color: #6b5f50;
    text-decoration: none;
    font-size: 14px;
    font-weight: 400;
    letter-spacing: 0.01em;
    cursor: pointer;
    transition: color 0.25s;
    background: none; border-top: none; border-left: none; border-right: none;
    border-bottom: 1px solid #2a241c;
    width: 100%; text-align: left;
  }
  .nav-link:hover { color: var(--cream); }
  .nav-link.active { color: var(--gold); }

  .nav-dot {
    width: 6px; height: 6px;
    border-radius: 50%;
    background: currentColor;
    flex-shrink: 0;
  }

  /* Page stack */
  .page-stack {
    position: relative;
    overflow: hidden;
  }

  .page {
    position: absolute;
    inset: 0;
    padding: 64px 72px;
    overflow-y: auto;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-dur) var(--transition-ease);
    will-change: opacity;
  }

  .page.active {
    opacity: 1;
    pointer-events: auto;
  }

  /* Page content styles */
  .page-eyebrow {
    font-size: 10px;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--gold);
    margin-bottom: 20px;
  }

  .page-title {
    font-family: 'Cormorant Garamond', serif;
    font-size: clamp(36px, 5vw, 64px);
    font-weight: 300;
    line-height: 1.1;
    color: var(--ink);
    margin-bottom: 28px;
  }

  .page-title em { font-style: italic; color: var(--muted); }

  .page-body {
    font-size: 15px;
    line-height: 1.8;
    color: var(--muted);
    max-width: 540px;
    margin-bottom: 48px;
  }

  .card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
    max-width: 680px;
  }

  .card {
    background: white;
    border-radius: 4px;
    overflow: hidden;
    box-shadow: 0 2px 12px rgba(0,0,0,0.06);
  }

  .card-img {
    height: 130px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 40px;
  }

  .card-info { padding: 16px; }
  .card-info h3 { font-size: 14px; font-weight: 500; margin-bottom: 4px; }
  .card-info p { font-size: 12px; color: var(--muted); }

  /* Stats page */
  .stat-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    max-width: 600px;
    margin-bottom: 40px;
  }

  .stat-box {
    background: white;
    border-radius: 4px;
    padding: 28px 24px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.06);
  }

  .stat-num {
    font-family: 'Cormorant Garamond', serif;
    font-size: 48px;
    font-weight: 300;
    color: var(--ink);
    line-height: 1;
    margin-bottom: 8px;
  }

  .stat-label { font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); }

  /* Settings page */
  .setting-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 0;
    border-bottom: 1px solid #e8e2d8;
    max-width: 520px;
  }
  .setting-label { font-size: 14px; }
  .setting-desc { font-size: 12px; color: var(--muted); margin-top: 4px; }

  .toggle {
    width: 44px; height: 24px;
    background: #d1c9bc;
    border-radius: 12px;
    position: relative;
    cursor: pointer;
    transition: background 0.3s;
    flex-shrink: 0;
  }
  .toggle.on { background: var(--gold); }
  .toggle::after {
    content: '';
    position: absolute;
    width: 18px; height: 18px;
    background: white;
    border-radius: 50%;
    top: 3px; left: 3px;
    transition: transform 0.3s;
    box-shadow: 0 1px 4px rgba(0,0,0,0.2);
  }
  .toggle.on::after { transform: translateX(20px); }

  /* Badge */
  .badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 2px;
    font-size: 10px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    background: var(--gold);
    color: white;
    margin-bottom: 32px;
  }

  /* Mobile */
  @media (max-width: 640px) {
    .shell { grid-template-columns: 1fr; grid-template-rows: auto 1fr; }
    .sidebar { padding: 24px 20px; flex-direction: row; align-items: center; flex-wrap: wrap; gap: 8px; }
    .sidebar-brand { margin-bottom: 0; font-size: 18px; flex: 1; }
    .nav-label { display: none; }
    .nav-link { padding: 10px 16px; border: 1px solid #2a241c; border-radius: 20px; font-size: 12px; }
    .page { padding: 32px 24px; }
    .stat-row { grid-template-columns: 1fr 1fr; }
    .card-grid { grid-template-columns: 1fr 1fr; }
  }
JS
const links = document.querySelectorAll('.nav-link');
  const pages = document.querySelectorAll('.page');

  links.forEach(link => {
    link.addEventListener('click', () => {
      const target = link.dataset.target;

      links.forEach(l => l.classList.remove('active'));
      link.classList.add('active');

      pages.forEach(page => {
        if (page.id === target) {
          page.classList.add('active');
        } else {
          page.classList.remove('active');
        }
      });
    });
  });