fix: filter past MC events by start time, fix no-image card collapse, center cards

- isUpcoming() now checks startTime, not just date — past events hide after they start
- Cards without images get a gradient placeholder instead of collapsing to 0 height
- Merge two Reveal wrappers into one to prevent empty Reveal stuck at opacity 0
- Use flex layout with justify-center so single cards are centered

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/components/sections/MasterClasses.tsx

@@ -71,12 +71,17 @@ function calcDuration(slot: MasterClassSlot): string {
 }
 
 function isUpcoming(item: MasterClassItem): boolean {
-  const today = new Date();
-  today.setHours(0, 0, 0, 0);
-  const lastDate = (item.slots ?? [])
-    .map((s) => parseDate(s.date))
-    .reduce((a, b) => (a > b ? a : b), new Date(0));
-  return lastDate >= today;
+  const now = new Date();
+  return (item.slots ?? []).some((s) => {
+    const slotDate = parseDate(s.date);
+    if (s.startTime) {
+      const [h, m] = s.startTime.split(":").map(Number);
+      slotDate.setHours(h, m, 0, 0);
+    } else {
+      slotDate.setHours(23, 59, 59, 999);
+    }
+    return slotDate > now;
+  });
 }
 
 function MasterClassCard({
@@ -90,10 +95,11 @@ function MasterClassCard({
   const slotsDisplay = formatSlots(item.slots);
 
   return (
-    <div className="group relative flex flex-col overflow-hidden rounded-2xl bg-black">
-      {/* Full-bleed image */}
-      {item.image && (
+    <div className="group relative flex w-full max-w-sm flex-col overflow-hidden rounded-2xl bg-black">
+      {/* Full-bleed image or placeholder */}
       <div className="relative aspect-[3/4] sm:aspect-[2/3] w-full overflow-hidden">
+        {item.image ? (
+          <>
             <Image
               src={item.image}
               alt={item.title}
@@ -102,10 +108,12 @@ function MasterClassCard({
               sizes="(min-width: 1024px) 33vw, (min-width: 640px) 50vw, 100vw"
               className="object-cover transition-transform duration-700 group-hover:scale-110"
             />
-          {/* Dark overlay that intensifies on hover */}
             <div className="absolute inset-0 bg-gradient-to-t from-black via-black/20 to-transparent opacity-80 transition-opacity duration-500 group-hover:opacity-90" />
-        </div>
+          </>
+        ) : (
+          <div className="absolute inset-0 bg-gradient-to-b from-neutral-800 to-black" />
         )}
+      </div>
 
       {/* Content overlay at bottom */}
       <div className="absolute inset-x-0 bottom-0 flex flex-col p-5 sm:p-6">
@@ -207,8 +215,8 @@ export function MasterClasses({ data }: MasterClassesProps) {
           <SectionHeading centered>{data.title}</SectionHeading>
         </Reveal>
 
-        {upcoming.length === 0 ? (
         <Reveal>
+          {upcoming.length === 0 ? (
             <div className="mt-10 py-12 text-center">
               <p className="text-sm text-neutral-500 dark:text-white/40">
                 Следите за анонсами мастер-классов в нашем{" "}
@@ -222,10 +230,8 @@ export function MasterClasses({ data }: MasterClassesProps) {
                 </a>
               </p>
             </div>
-          </Reveal>
           ) : (
-          <Reveal>
-            <div className="mx-auto mt-10 grid max-w-5xl grid-cols-1 gap-5 sm:grid-cols-2 lg:grid-cols-3">
+            <div className="mx-auto mt-10 flex max-w-5xl flex-wrap justify-center gap-5">
               {upcoming.map((item) => (
                 <MasterClassCard
                   key={item.title}
@@ -234,8 +240,8 @@ export function MasterClasses({ data }: MasterClassesProps) {
                 />
               ))}
             </div>
-          </Reveal>
           )}
+        </Reveal>
       </div>
 
       <SignupModal