feat: responsive nav — hamburger menu + wider container (900px breakpoint)

- Widen nav container from 72rem to 80rem (1280px) — matches Zillow's
  nav container width, more breathing room for items on large monitors
- Raise collapse breakpoint from 768px to 899px — links stay visible
  until the screen is actually too narrow
- Add hamburger button (SVG 3-line icon) visible at < 900px
- Add mobile drop-down panel with all nav links grouped under Plan /
  Explore / Account sections; overlay + Escape key close it

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

CHANGELOG.md

@@ -6,6 +6,15 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
 ## [Unreleased]
 
+### Added
+- Nav: hamburger menu on screens < 900px — clicking opens a full-width mobile panel with all nav links; overlay click and Escape key close it
+- Nav: mobile panel groups links under "Plan", "Explore", and "Account" section headers
+
+### Changed
+- Nav: widen container from 72rem (1152px) to 80rem (1280px) — matches Zillow's nav container width, more breathing room for nav items on large monitors
+- Nav: collapse breakpoint raised from 768px to 899px — nav links no longer hide until the screen is actually too narrow
+- Nav: remove redundant inline `style="display:grid;grid-template-columns:1fr auto 1fr"` on `.nav-inner` (already in CSS)
+
 ### Fixed
 - i18n: improve German nav labels — "Verzeichnis" → "Anbieterverzeichnis", "Planer" → "Kostenrechner"
 - CI: add missing env vars to `.env` heredoc — `WAITLIST_MODE`, `LEADS_EMAIL`, `UMAMI_API_URL`; make Paddle vars optional (`:-`) so they don't break deploys when unset

padelnomics/src/padelnomics/static/css/input.css

@@ -113,9 +113,9 @@
     border-bottom: 1px solid #E2E8F0;
   }
   .nav-inner {
-    max-width: 72rem;
+    max-width: 80rem;
     margin: 0 auto;
-    padding: 0 1rem;
+    padding: 0 1.5rem;
     display: grid;
     grid-template-columns: 1fr auto 1fr;
     align-items: center;
@@ -172,9 +172,84 @@
     padding: 0;
     display: inline;
   }
-  @media (max-width: 768px) {
+  /* Hamburger button — hidden on desktop */
+  .nav-hamburger {
+    display: none;
+    align-items: center;
+    justify-content: center;
+    width: 36px;
+    height: 36px;
+    background: transparent;
+    border: none;
+    cursor: pointer;
+    padding: 6px;
+    border-radius: 8px;
+    transition: background 0.15s;
+  }
+  .nav-hamburger:hover { background: #F1F5F9; }
+  .nav-hamburger svg { display: block; }
+  /* Mobile menu panel — hidden by default */
+  .nav-mobile {
+    display: none;
+    position: absolute;
+    top: 56px;
+    left: 0;
+    right: 0;
+    background: #fff;
+    border-bottom: 1px solid #E2E8F0;
+    box-shadow: 0 8px 24px rgba(0,0,0,0.08);
+    z-index: 49;
+    flex-direction: column;
+    padding: 0.75rem 1.5rem 1rem;
+  }
+  .nav-bar[data-navopen="true"] .nav-mobile {
+    display: flex;
+  }
+  .nav-mobile a,
+  .nav-mobile button.nav-auth-btn,
+  .nav-mobile a.nav-auth-btn {
+    display: block;
+    padding: 0.625rem 0;
+    border-bottom: 1px solid #F1F5F9;
+    font-size: 0.9375rem;
+    font-weight: 500;
+    color: #475569;
+    text-decoration: none;
+    transition: color 0.15s;
+  }
+  .nav-mobile a:last-child { border-bottom: none; }
+  .nav-mobile a:hover { color: #1D4ED8; }
+  .nav-mobile a.nav-auth-btn,
+  .nav-mobile button.nav-auth-btn {
+    display: inline-flex;
+    margin-top: 0.5rem;
+    border-bottom: none;
+    width: auto;
+    align-self: flex-start;
+  }
+  .nav-mobile .nav-mobile-section {
+    font-size: 0.6875rem;
+    font-weight: 700;
+    text-transform: uppercase;
+    letter-spacing: 0.07em;
+    color: #94A3B8;
+    padding: 0.75rem 0 0.25rem;
+  }
+  /* Overlay behind mobile menu */
+  .nav-overlay {
+    display: none;
+    position: fixed;
+    inset: 0;
+    z-index: 48;
+  }
+  .nav-bar[data-navopen="true"] ~ .nav-overlay {
+    display: block;
+  }
+  @media (max-width: 899px) {
     .nav-links { display: none; }
-    .nav-inner { justify-content: center; }
+    .nav-hamburger { display: flex; }
+    .nav-inner { grid-template-columns: auto 1fr auto; }
+    .nav-bar { position: sticky; }
   }
 
   /* Page container */

padelnomics/src/padelnomics/templates/base.html

@@ -38,8 +38,8 @@
   {% block head %}{% endblock %}
 </head>
 <body>
-  <nav class="nav-bar">
+  <nav class="nav-bar" id="main-nav">
-    <div class="nav-inner" style="display:grid;grid-template-columns:1fr auto 1fr">
+    <div class="nav-inner">
       <!-- Left: demand / buy side -->
       <div class="nav-links nav-links--left">
         <a href="{{ url_for('planner.index') }}">{{ t.nav_planner }}</a>
@@ -51,7 +51,7 @@
         <span style="font-family:'Bricolage Grotesque',sans-serif;font-weight:800;font-size:1.125rem;color:#0F172A;letter-spacing:-0.02em">padelnomics</span>
       </a>
 
-      <!-- Right: supply side + auth -->
+      <!-- Right: supply side + auth (desktop only) -->
       <div class="nav-links nav-links--right">
         <a href="{{ url_for('directory.index') }}">{{ t.nav_directory }}</a>
         <a href="{{ url_for('content.markets') }}">{{ t.nav_markets }}</a>
@@ -88,10 +88,72 @@
         {% else %}
         <a href="{{ url_for('auth.login') }}" class="nav-auth-btn">{{ t.nav_signin }}</a>
         {% endif %}
+
+        <!-- Hamburger (mobile only) -->
+        <button type="button" class="nav-hamburger" id="nav-hamburger-btn" aria-label="Open navigation" aria-expanded="false">
+          <svg width="20" height="20" viewBox="0 0 20 20" fill="none" xmlns="http://www.w3.org/2000/svg" aria-hidden="true">
+            <rect y="3" width="20" height="2" rx="1" fill="#0F172A"/>
+            <rect y="9" width="20" height="2" rx="1" fill="#0F172A"/>
+            <rect y="15" width="20" height="2" rx="1" fill="#0F172A"/>
+          </svg>
+        </button>
       </div>
     </div>
+
+    <!-- Mobile menu panel -->
+    <div class="nav-mobile" id="nav-mobile-panel">
+      <span class="nav-mobile-section">Plan</span>
+      <a href="{{ url_for('planner.index') }}">{{ t.nav_planner }}</a>
+      <a href="{{ url_for('leads.quote_request') }}">{{ t.nav_quotes }}</a>
+
+      <span class="nav-mobile-section">Explore</span>
+      <a href="{{ url_for('directory.index') }}">{{ t.nav_directory }}</a>
+      <a href="{{ url_for('content.markets') }}">{{ t.nav_markets }}</a>
+      <a href="{{ url_for('public.suppliers') }}">{{ t.nav_suppliers }}</a>
+      <a href="{{ url_for('public.landing') }}#faq">{{ t.nav_help }}</a>
+
+      {% if user %}
+      <span class="nav-mobile-section">Account</span>
+      <a href="{{ url_for('dashboard.index') }}">{{ t.nav_dashboard }}</a>
+      {% if is_admin %}
+      <a href="{{ url_for('admin.index') }}">{{ t.nav_admin }}</a>
+      {% endif %}
+      <form method="post" action="{{ url_for('auth.logout') }}" style="margin:0.5rem 0 0;padding:0">
+        <input type="hidden" name="csrf_token" value="{{ csrf_token() }}">
+        <button type="submit" class="nav-auth-btn">{{ t.nav_signout }}</button>
+      </form>
+      {% else %}
+      <a href="{{ url_for('auth.login') }}" class="nav-auth-btn" style="margin-top:0.5rem">{{ t.nav_signin }}</a>
+      {% endif %}
+    </div>
   </nav>
 
+  <!-- Overlay — closes mobile menu when clicked -->
+  <div class="nav-overlay" id="nav-overlay"></div>
+
+  <script>
+  (function() {
+    var nav = document.getElementById('main-nav');
+    var btn = document.getElementById('nav-hamburger-btn');
+    var overlay = document.getElementById('nav-overlay');
+    function open() {
+      nav.setAttribute('data-navopen', 'true');
+      btn.setAttribute('aria-expanded', 'true');
+    }
+    function close() {
+      nav.removeAttribute('data-navopen');
+      btn.setAttribute('aria-expanded', 'false');
+    }
+    btn.addEventListener('click', function() {
+      nav.hasAttribute('data-navopen') ? close() : open();
+    });
+    overlay.addEventListener('click', close);
+    document.addEventListener('keydown', function(e) {
+      if (e.key === 'Escape') close();
+    });
+  })();
+  </script>
+
   <!-- Flash messages -->
   {% with messages = get_flashed_messages(with_categories=true) %}
   {% if messages %}