[#1+#7] Mobile-first redesign + accessibility

- Bottom tab bar on mobile (≤640px), top tabs on desktop
- Name modal → bottom sheet on mobile with drag handle
- Larger tap targets (72px cards, 44px touch areas)
- Arrow hint (›) on clickable option cards
- Touch feedback with :active scale animation
- ARIA roles: tablist/tab/tabpanel, aria-selected, aria-live=polite
- Keyboard: Arrow keys navigate tabs, 1-5 number keys switch tabs
- Skip-to-content link for screen readers
- Visible :focus-visible ring
- Desktop body padding reset for bottom tabs

public/index.html

@@ -40,6 +40,26 @@
     a { color: var(--accent); text-decoration: none; }
     a:hover { text-decoration: underline; }
 
+    /* Skip to content */
+    .skip-link {
+      position: absolute;
+      top: -40px;
+      left: 0;
+      background: var(--accent);
+      color: var(--bg);
+      padding: 8px 16px;
+      z-index: 9999;
+      font-weight: 700;
+      border-radius: 0 0 8px 0;
+    }
+    .skip-link:focus { top: 0; }
+
+    /* Visible focus ring for accessibility */
+    :focus-visible {
+      outline: 2px solid var(--accent);
+      outline-offset: 2px;
+    }
+
     /* ── Header ─────────────────────────────────────────────── */
     header {
       background: linear-gradient(135deg, #13161f 0%, #1a1e2a 100%);
@@ -97,6 +117,10 @@
       width: 360px;
       text-align: center;
       box-shadow: 0 20px 60px rgba(0,0,0,0.5);
+      position: relative;
+    }
+    .modal .drag-handle {
+      display: none;
     }
     .modal h2 { font-size: 1.3rem; margin-bottom: 6px; color: var(--accent); }
     .modal p { color: var(--text-muted); font-size: 0.85rem; margin-bottom: 20px; }
@@ -405,20 +429,134 @@
     }
     .empty-state .empty-emoji { font-size: 2rem; margin-bottom: 10px; }
 
-    /* ── Mobile ──────────────────────────────────────────────── */
+    /* ── Bottom tab bar (mobile ≤640px) ──────────────────────── */
-    @media (max-width: 480px) {
+    @media (max-width: 640px) {
-      header { flex-direction: column; gap: 6px; align-items: flex-start; }
+      body { padding-bottom: 68px; }
-      .meta { text-align: left; }
+
-      main { padding: 12px; }
+      /* Compact sticky header */
-      .tab { min-width: 70px; font-size: 0.68rem; }
+      header {
+        padding: 8px 14px;
+        gap: 4px;
       }
+      header h1 { font-size: 0.95rem; }
+      header .meta { font-size: 0.72rem; }
+
+      /* Bottom tab bar */
+      .tabs {
+        position: fixed;
+        bottom: 0;
+        left: 0;
+        right: 0;
+        top: auto;
+        border-bottom: none;
+        border-top: 1px solid var(--border);
+        background: var(--surface);
+        z-index: 100;
+        display: flex;
+        padding-bottom: env(safe-area-inset-bottom);
+        /* hide scroll — show all 5 tabs in a row */
+        overflow-x: auto;
+        scrollbar-width: none;
+        box-shadow: 0 -4px 20px rgba(0,0,0,0.4);
+      }
+      .tabs::-webkit-scrollbar { display: none; }
+      .tab {
+        flex: 1;
+        min-width: 0;
+        padding: 8px 4px 10px;
+        border-bottom: none;
+        border-top: 3px solid transparent;
+        border-radius: 0;
+        font-size: 0.6rem;
+        display: flex;
+        flex-direction: column;
+        align-items: center;
+        gap: 3px;
+      }
+      .tab.active {
+        border-top-color: var(--accent);
+        background: rgba(0,212,255,0.08);
+        color: var(--accent);
+      }
+      .tab .tab-emoji { font-size: 1.2rem; }
+      .tab .tab-count {
+        position: absolute;
+        top: 4px;
+        right: 6px;
+        font-size: 0.55rem;
+        padding: 0 4px;
+      }
+
+      /* Main adjusts for bottom tabs */
+      main { padding: 12px; max-width: 100%; }
+
+      /* Option cards — larger tap targets */
+      .option-card { min-height: 72px; padding: 14px 16px; }
+      .option-name { font-size: 0.92rem; }
+      .option-desc { font-size: 0.76rem; }
+
+      /* Add arrow hint to cards */
+      .option-card::after {
+        content: '›';
+        position: absolute;
+        right: 14px;
+        top: 50%;
+        transform: translateY(-50%);
+        color: var(--text-muted);
+        font-size: 1.2rem;
+        opacity: 0.4;
+      }
+      .option-card.voted::after { display: none; }
+
+      /* Touch feedback */
+      .option-card:active { transform: scale(0.98); opacity: 0.9; }
+    }
+
+    /* ── Desktop (≥641px) ──────────────────────────────────── */
+    @media (min-width: 641px) {
+      body { padding-bottom: 0; }
+    }
+
+    /* ── Mobile bottom sheet modal ───────────────────────────── */
+    @media (max-width: 640px) {
+      .modal-overlay { align-items: flex-end; justify-content: stretch; padding: 0; }
+      .modal {
+        width: 100%;
+        border-radius: 20px 20px 0 0;
+        padding: 12px 24px 32px;
+        max-height: 85vh;
+        overflow-y: auto;
+        box-shadow: 0 -8px 40px rgba(0,0,0,0.6);
+        animation: slideUp 0.3s ease-out;
+      }
+      @keyframes slideUp {
+        from { transform: translateY(100%); }
+        to   { transform: translateY(0); }
+      }
+      .modal .drag-handle {
+        display: block;
+        width: 40px;
+        height: 4px;
+        background: var(--border);
+        border-radius: 2px;
+        margin: 0 auto 14px;
+      }
+      .modal h2 { font-size: 1.15rem; }
+      .modal p { font-size: 0.8rem; margin-bottom: 14px; }
+      .modal input, .modal button { margin-bottom: 10px; }
+    }
+
+    /* Touch highlight */
+    .option-card { -webkit-tap-highlight-color: rgba(0,212,255,0.12); }
   </style>
 </head>
 <body>
+<a class="skip-link" href="#optionsList">Skip to voting options</a>
 
 <!-- Name Modal -->
 <div class="modal-overlay" id="nameModal">
   <div class="modal">
+    <div class="drag-handle"></div>
     <h2>🏄 Who's Voting?</h2>
     <p>Enter your name so groomsmen know who voted for what. Stored locally — only visible to the group.</p>
     <input type="text" id="voterNameInput" placeholder="e.g. Mike, Chris, Dave…" maxlength="30" autocomplete="off" />
@@ -448,7 +586,7 @@
     <div><span id="totalVotersCount"></span></div>
   </div>
 
-  <div class="options-list" id="optionsList">
+  <div class="options-list" id="optionsList" role="tabpanel" aria-label="Voting options" aria-live="polite">
     <div class="empty-state"><div class="empty-emoji">⏳</div>Loading options…</div>
   </div>
 
@@ -500,6 +638,15 @@
       if (e.key === 'Enter') submitName();
     });
     document.getElementById('voterNameInput').focus();
+
+    // Number keys 1-5 to switch tabs
+    document.addEventListener('keydown', e => {
+      if (e.target.tagName === 'INPUT' || e.target.tagName === 'TEXTAREA') return;
+      const num = parseInt(e.key);
+      if (num >= 1 && num <= state.categories.length) {
+        setTab(state.categories[num - 1].id);
+      }
+    });
   }
 
   // ── WebSocket ──────────────────────────────────────────────
@@ -592,18 +739,44 @@
   function renderTabs() {
     const bar = document.getElementById('tabsBar');
     bar.innerHTML = state.categories.map(cat => `
-      <div class="tab${cat.id === activeTab ? ' active' : ''}" onclick="setTab('${cat.id}')">
+      <div class="tab${cat.id === activeTab ? ' active' : ''}"
+           role="tab"
+           id="tab-${cat.id}"
+           aria-selected="${cat.id === activeTab}"
+           aria-controls="optionsList"
+           tabindex="${cat.id === activeTab ? 0 : -1}"
+           onclick="setTab('${cat.id}')"
+           onkeydown="handleTabKey(event, '${cat.id}')">
         <span class="tab-emoji">${cat.emoji}</span>
         ${cat.name}
         <span class="tab-count" id="tab-count-${cat.id}">${state.options.filter(o => o.categoryId === cat.id).length}</span>
       </div>
     `).join('');
+    bar.setAttribute('role', 'tablist');
+    bar.setAttribute('aria-label', 'Voting categories');
+  }
+
+  function handleTabKey(event, catId) {
+    const cats = state.categories.map(c => c.id);
+    const idx = cats.indexOf(catId);
+    if (event.key === 'ArrowRight' || event.key === 'ArrowDown') {
+      event.preventDefault();
+      setTab(cats[(idx + 1) % cats.length]);
+    } else if (event.key === 'ArrowLeft' || event.key === 'ArrowUp') {
+      event.preventDefault();
+      setTab(cats[(idx - 1 + cats.length) % cats.length]);
+    } else if (event.key === 'Enter' || event.key === ' ') {
+      event.preventDefault();
+      setTab(catId);
+    }
+    document.getElementById(`tab-${cats[(idx + 1) % cats.length]}`)?.focus();
   }
 
   function setTab(id) {
     activeTab = id;
     renderTabs();
     render();
+    document.getElementById('optionsList')?.setAttribute('aria-label', state.categories.find(c => c.id === id)?.name + ' options');
   }
 
   // ── Render options ────────────────────────────────────────