diff --git a/index.html b/index.html
index d3490c6..284cf91 100644
--- a/index.html
+++ b/index.html
@@ -792,9 +792,11 @@
             </div>
             <div class="cal-legend">
               <div class="cal-legend-item"><div class="cal-legend-dot" style="background:rgba(255,255,255,0.12)"></div> Available</div>
-              <div class="cal-legend-item"><div class="cal-legend-dot" style="background:rgba(239,68,68,0.35)"></div> Booked</div>
               <div class="cal-legend-item"><div class="cal-legend-dot" style="background:var(--orange)"></div> Selected</div>
+              <div class="cal-legend-item" id="legend-range" style="display:none"><div class="cal-legend-dot" style="background:rgba(249,115,22,0.35)"></div> In Range</div>
+              <div class="cal-legend-item"><div class="cal-legend-dot" style="background:rgba(239,68,68,0.35)"></div> Unavailable</div>
             </div>
+            <p id="calHint" style="font-size:0.72rem;color:rgba(255,255,255,0.35);margin-top:0.5rem">Click any available date to select it. Weekend rentals automatically highlight both days.</p>
           </div>
 
           <form class="contact-form" id="bookingForm" novalidate>
@@ -884,14 +886,57 @@
     let calMonth = new Date().getMonth() + 1; // 1-based
     let bookedSet = new Set();
     let selectedDate = null;
+    let selectedPackage = 'half-day';
+    const availCache = {};
+
+    function getEndDateStr(startDate, pkg) {
+      if (!startDate || pkg !== 'weekend') return startDate;
+      const d = new Date(startDate + 'T12:00:00');
+      d.setDate(d.getDate() + 1);
+      return d.toISOString().split('T')[0];
+    }
+
+    async function fetchAvail(month, year) {
+      const key = year + '-' + String(month).padStart(2, '0');
+      if (!availCache[key]) {
+        const res = await fetch('/availability.php?month=' + month + '&year=' + year);
+        const data = await res.json();
+        availCache[key] = new Set(data.booked_dates || []);
+      }
+      return availCache[key];
+    }
+
+    async function hasRangeConflict(startDate, pkg) {
+      const endDate = getEndDateStr(startDate, pkg);
+      const dates = (endDate && endDate !== startDate) ? [startDate, endDate] : [startDate];
+      for (const date of dates) {
+        const [y, m] = date.split('-').map(Number);
+        const set = await fetchAvail(m, y);
+        if (set.has(date)) return true;
+      }
+      return false;
+    }
+
+    function showDateUnavail() {
+      const msg = document.getElementById('date-unavail-msg');
+      if (msg) { msg.style.display = 'block'; setTimeout(() => msg.style.display = 'none', 5000); }
+    }
+
+    function updateLegend() {
+      const rangeItem = document.getElementById('legend-range');
+      const hint = document.getElementById('calHint');
+      const isWknd = selectedPackage === 'weekend';
+      if (rangeItem) rangeItem.style.display = isWknd ? 'flex' : 'none';
+      if (hint) hint.textContent = isWknd
+        ? 'Click your start date — both weekend days highlight automatically.'
+        : 'Click any available date to select it.';
+    }
 
     async function loadCalendar(month, year) {
       calTitle.textContent = MONTH_NAMES[month - 1] + ' ' + year;
       calGrid.innerHTML = '<div class="cal-loading" style="grid-column:1/-1">Checking availability&hellip;</div>';
       try {
-        const res  = await fetch('/availability.php?month=' + month + '&year=' + year);
-        const data = await res.json();
-        bookedSet  = new Set(data.booked_dates || []);
+        bookedSet = await fetchAvail(month, year);
         renderCalendar(month, year);
       } catch {
         calGrid.innerHTML = '<div class="cal-loading" style="grid-column:1/-1;color:rgba(239,68,68,0.6)">Could not load availability.</div>';
@@ -928,14 +973,20 @@
         const isBooked  = bookedSet.has(dateStr);
         const isToday   = dateStr === todayStr;
         const isSel     = dateStr === selectedDate;
+        const endDate   = getEndDateStr(selectedDate, selectedPackage);
+        const isInRange = !isSel && selectedDate && endDate && endDate !== selectedDate
+                          && dateStr > selectedDate && dateStr <= endDate;
 
         if (isSel) {
           el.className = 'cal-day selected';
+        } else if (isInRange) {
+          el.className = 'cal-day in-range' + (isBooked ? ' booked' : '');
+          el.title = isBooked ? 'Conflict — this day is unavailable' : 'In your booking range';
         } else if (isPast) {
           el.className = 'cal-day past';
         } else if (isBooked) {
           el.className = 'cal-day booked';
-          el.title = 'Already booked';
+          el.title = 'Unavailable';
         } else {
           el.className = 'cal-day available' + (isToday ? ' today' : '');
           el.addEventListener('click', () => selectDate(dateStr));
@@ -948,14 +999,14 @@
       calGrid.appendChild(fragment);
     }
 
-    function selectDate(dateStr) {
-      selectedDate = dateStr;
-      if (dateInput) {
-        dateInput.value = dateStr;
-        dateInput.dispatchEvent(new Event('change'));
+    async function selectDate(dateStr) {
+      if (await hasRangeConflict(dateStr, selectedPackage)) {
+        showDateUnavail();
+        return;
       }
+      selectedDate = dateStr;
+      if (dateInput) dateInput.value = dateStr;
       renderCalendar(calMonth, calYear);
-      // Smooth-scroll form into view
       document.getElementById('bookingForm').scrollIntoView({ behavior: 'smooth', block: 'start' });
     }
 
@@ -1002,8 +1053,17 @@
     const pkgSelect = document.querySelector('select[name="package"]');
     const balLabel  = document.getElementById('balance-due-label');
     const balAmt    = document.getElementById('balance-due-amount');
+    if (pkgSelect) { selectedPackage = pkgSelect.value || 'half-day'; }
     if (pkgSelect) {
       pkgSelect.addEventListener('change', function() {
+        selectedPackage = this.value;
+        updateLegend();
+        if (selectedDate) {
+          hasRangeConflict(selectedDate, selectedPackage).then(conflict => {
+            if (conflict) { if (dateInput) dateInput.value = ''; selectedDate = null; showDateUnavail(); }
+            renderCalendar(calMonth, calYear);
+          });
+        } else { renderCalendar(calMonth, calYear); }
         const price = PACKAGE_PRICES[this.value];
         if (price && balLabel && balAmt) {
           balAmt.textContent = '$' + (price - DEPOSIT).toFixed(2).replace(/\.00$/, '');