Fix PDF viewer issues, optimize downloads, improve sidebar behavior, and add reusable announcement component

src/components/SideBar.tsx

@@ -100,7 +100,9 @@ function SideBar() {
   ];
 
   return (
-    <div className="no-scrollbar sticky top-0 h-[100vh] flex-col items-baseline overflow-y-auto border-r-2 border-[#36266d] bg-[#f3f5ff] pt-[10px] dark:bg-[#070114] md:flex">
+    <div
+  className="no-scrollbar sticky top-[92px] md:top-[100px] h-[calc(100vh-92px)] md:h-[calc(100vh-100px)] flex-col items-baseline overflow-y-auto border-r-2 border-[#36266d] bg-[#f3f5ff] pt-[10px] dark:bg-[#070114] md:flex"
+>
       <div className="flex w-full items-center justify-between border-b-2 border-[#36266d] px-[10px] py-4">
         <div className="flex items-center gap-1">
           <Filter size={24} />

src/components/ui/announcement/Announcement.tsx

@@ -0,0 +1,321 @@
+"use client";
+
+import * as React from "react";
+import Image from "next/image";
+import Link from "next/link";
+import { X, Megaphone, ArrowUpRight, type LucideIcon } from "lucide-react";
+import { cn } from "@/lib/utils";
+
+export type AnnouncementAccent = "purple" | "amber" | "green" | "rose";
+export type AnnouncementVariant = "banner" | "card";
+
+export interface AnnouncementProps {
+  /**
+   * Stable, unique id for this announcement (e.g. "cookoff-2026").
+   * Used as the localStorage key so a dismissal is remembered per-campaign,
+   * not globally — dismissing one promo doesn't hide future ones.
+   */
+  id: string;
+  title: string;
+  message: string;
+  variant?: AnnouncementVariant;
+  /** Call-to-action label, e.g. "Register now". Omit to render without a CTA. */
+  ctaLabel?: string;
+  /** Where the CTA (and, for banners, the whole strip) links to. External links open in a new tab automatically. */
+  href?: string;
+  /** Card-variant only: image shown above the copy (16:9). Ignored for banners. */
+  imageUrl?: string;
+  imageAlt?: string;
+  /** Custom lucide icon; defaults to a megaphone. */
+  icon?: LucideIcon;
+  /** Color preset. Pick based on urgency/category, not vibes: purple = general promo, amber = time-sensitive, green = opportunity/open, rose = urgent/closing soon. */
+  accent?: AnnouncementAccent;
+  /** Whether the person can dismiss it. Defaults to true. */
+  dismissible?: boolean;
+  /** ISO date string. Past this date the announcement stops rendering, dismissed or not — no stale promos. */
+  expiresAt?: string;
+  /** Shows a small "Sponsored" tag for transparency. Defaults to true — this is an ad, say so. */
+  sponsored?: boolean;
+  onDismiss?: () => void;
+  className?: string;
+}
+
+const accentStyles: Record<
+  AnnouncementAccent,
+  {
+    cardBorder: string;
+    cardSurface: string;
+    bannerSurface: string;
+    chip: string;
+    chipIcon: string;
+    accentText: string;
+    cta: string;
+    tagText: string;
+  }
+> = {
+  purple: {
+    cardBorder: "border-[#734DFF] dark:border-[#36266D]",
+    cardSurface: "bg-white dark:bg-[#171720]",
+    bannerSurface: "bg-[#EFEAFF] dark:bg-[#171720]",
+    chip: "bg-[#EFEAFF] dark:bg-[#262635]",
+    chipIcon: "text-[#562EE7] dark:text-[#A79DFF]",
+    accentText: "text-[#562EE7] dark:text-[#A79DFF]",
+    cta: "bg-[#734DFF] text-white hover:bg-[#5F3FE0]",
+    tagText: "text-[#734DFF] dark:text-[#A79DFF]",
+  },
+  amber: {
+    cardBorder: "border-[#d97706] dark:border-[#7c4a08]",
+    cardSurface: "bg-white dark:bg-[#171720]",
+    bannerSurface: "bg-[#fef3c7] dark:bg-[#3a2a05]",
+    chip: "bg-[#fde8b8] dark:bg-[#4a3608]",
+    chipIcon: "text-[#92600b] dark:text-[#f5c451]",
+    accentText: "text-[#92600b] dark:text-[#f5c451]",
+    cta: "bg-[#d97706] text-white hover:bg-[#b8630a]",
+    tagText: "text-[#92600b] dark:text-[#f5c451]",
+  },
+  green: {
+    cardBorder: "border-[#16a34a] dark:border-[#0f6b32]",
+    cardSurface: "bg-white dark:bg-[#171720]",
+    bannerSurface: "bg-[#dcfce7] dark:bg-[#052e13]",
+    chip: "bg-[#c7f7d4] dark:bg-[#0b3d1c]",
+    chipIcon: "text-[#15803d] dark:text-[#6ee7a0]",
+    accentText: "text-[#15803d] dark:text-[#6ee7a0]",
+    cta: "bg-[#16a34a] text-white hover:bg-[#128a3e]",
+    tagText: "text-[#15803d] dark:text-[#6ee7a0]",
+  },
+  rose: {
+    cardBorder: "border-[#e11d48] dark:border-[#8a0f2c]",
+    cardSurface: "bg-white dark:bg-[#171720]",
+    bannerSurface: "bg-[#ffe4e6] dark:bg-[#3f0d16]",
+    chip: "bg-[#ffd2d6] dark:bg-[#521022]",
+    chipIcon: "text-[#be123c] dark:text-[#fda4b0]",
+    accentText: "text-[#be123c] dark:text-[#fda4b0]",
+    cta: "bg-[#e11d48] text-white hover:bg-[#c11640]",
+    tagText: "text-[#be123c] dark:text-[#fda4b0]",
+  },
+};
+
+function isExternal(href: string): boolean {
+  return /^https?:\/\//i.test(href);
+}
+
+function SmartLink({
+  href,
+  className,
+  children,
+  ariaLabel,
+}: {
+  href: string;
+  className?: string;
+  children: React.ReactNode;
+  ariaLabel?: string;
+}) {
+  if (isExternal(href)) {
+    return (
+      <a
+        href={href}
+        target="_blank"
+        rel="noopener noreferrer"
+        className={className}
+        aria-label={ariaLabel}
+      >
+        {children}
+      </a>
+    );
+  }
+  return (
+    <Link href={href} className={className} aria-label={ariaLabel}>
+      {children}
+    </Link>
+  );
+}
+
+/**
+ * Reusable promo/announcement unit for advertising events, deadlines, or
+ * sponsors on the papers site. Two variants:
+ *
+ *  - "banner": a thin dismissible strip, meant for the top of a page.
+ *  - "card": a promo card sized to match `Card.tsx`, meant to sit inside
+ *     the same paper grid (`grid-cols-1 md:grid-cols-2 lg:grid-cols-4`) as
+ *     a native-feeling in-feed ad.
+ *
+ * Dismissal is remembered per `id` in localStorage, and an optional
+ * `expiresAt` retires the announcement automatically so stale promos never
+ * linger after an event has passed.
+ */
+export default function Announcement({
+  id,
+  title,
+  message,
+  variant = "banner",
+  ctaLabel,
+  href,
+  imageUrl,
+  imageAlt,
+  icon: Icon = Megaphone,
+  accent = "purple",
+  dismissible = true,
+  expiresAt,
+  sponsored = true,
+  onDismiss,
+  className,
+}: AnnouncementProps) {
+  const [mounted, setMounted] = React.useState(false);
+  const [dismissed, setDismissed] = React.useState(false);
+
+  const storageKey = `announcement:${id}:dismissed`;
+
+  const isExpired = React.useMemo(() => {
+    if (!expiresAt) return false;
+    const expiry = new Date(expiresAt);
+    if (Number.isNaN(expiry.getTime())) return false;
+    return Date.now() > expiry.getTime();
+  }, [expiresAt]);
+
+  React.useEffect(() => {
+    setMounted(true);
+    if (dismissible) {
+      try {
+        setDismissed(window.localStorage.getItem(storageKey) === "true");
+      } catch {
+        setDismissed(false);
+      }
+    }
+  }, [storageKey, dismissible]);
+
+  const handleDismiss = () => {
+    setDismissed(true);
+    try {
+      window.localStorage.setItem(storageKey, "true");
+    } catch {
+    }
+    onDismiss?.();
+  };
+
+  if (!mounted || isExpired || (dismissible && dismissed)) return null;
+
+  const styles = accentStyles[accent];
+
+  if (variant === "banner") {
+    return (
+      <div
+        role="region"
+        aria-label={sponsored ? `Sponsored announcement: ${title}` : `Announcement: ${title}`}
+        className={cn(
+          "relative w-full font-play",
+          styles.bannerSurface,
+          className,
+        )}
+      >
+        <div className="mx-auto flex max-w-screen-2xl flex-col items-start gap-3 px-4 py-3 sm:flex-row sm:items-center sm:gap-4 md:px-8">
+          <div className={cn("flex h-9 w-9 flex-shrink-0 items-center justify-center rounded-full", styles.chip)}>
+            <Icon className={cn("h-5 w-5", styles.chipIcon)} />
+          </div>
+
+          <div className="flex min-w-0 flex-1 flex-col gap-0.5 sm:flex-row sm:items-center sm:gap-2">
+            <span className={cn("whitespace-nowrap text-sm font-semibold", styles.accentText)}>
+              {title}
+            </span>
+            <span className="text-sm text-gray-700 dark:text-gray-300 sm:truncate">
+              {message}
+            </span>
+          </div>
+
+          <div className="flex w-full items-center justify-between gap-3 sm:w-auto sm:justify-end">
+            {sponsored && (
+              <span className={cn("text-[10px] font-semibold uppercase tracking-wide opacity-70", styles.tagText)}>
+                Sponsored
+              </span>
+            )}
+
+            {ctaLabel && href && (
+              <SmartLink
+                href={href}
+                className={cn(
+                  "inline-flex flex-shrink-0 items-center gap-1 rounded-full px-3 py-1.5 text-xs font-semibold transition-colors",
+                  styles.cta,
+                )}
+              >
+                {ctaLabel}
+                <ArrowUpRight className="h-3.5 w-3.5" />
+              </SmartLink>
+            )}
+
+            {dismissible && (
+              <button
+                onClick={handleDismiss}
+                aria-label="Dismiss announcement"
+                className={cn("flex-shrink-0 rounded-full p-1 transition hover:opacity-70", styles.accentText)}
+              >
+                <X className="h-4 w-4" />
+              </button>
+            )}
+          </div>
+        </div>
+      </div>
+    );
+  }
+
+  // Card variant — sized to sit inside the same grid as paper Cards.
+  return (
+    <div
+      role="region"
+      aria-label={sponsored ? `Sponsored announcement: ${title}` : `Announcement: ${title}`}
+      className={cn(
+        "relative flex flex-col overflow-hidden rounded-sm border-2 font-play transition-all duration-150",
+        styles.cardBorder,
+        styles.cardSurface,
+        className,
+      )}
+    >
+      {dismissible && (
+        <button
+          onClick={handleDismiss}
+          aria-label="Dismiss announcement"
+          className="absolute right-2 top-2 z-10 rounded-full bg-black/40 p-1 text-white transition hover:bg-black/60"
+        >
+          <X className="h-3.5 w-3.5" />
+        </button>
+      )}
+
+      {imageUrl ? (
+        <Image
+          src={imageUrl}
+          alt={imageAlt ?? title}
+          width={320}
+          height={180}
+          className="w-full object-cover p-4 pb-3 md:h-[250px]"
+        />
+      ) : (
+        <div className={cn("m-4 mb-0 flex h-[150px] items-center justify-center rounded-sm md:h-[218px]", styles.chip)}>
+          <Icon className={cn("h-10 w-10", styles.chipIcon)} />
+        </div>
+      )}
+
+      <div className="flex flex-1 flex-col justify-between space-y-3 p-4">
+        <div className="space-y-1.5">
+          {sponsored && (
+            <span className={cn("text-[10px] font-semibold uppercase tracking-wide opacity-70", styles.tagText)}>
+              Sponsored
+            </span>
+          )}
+          <div className="font-play text-lg font-semibold leading-snug">{title}</div>
+          <p className="text-sm text-gray-600 dark:text-gray-400">{message}</p>
+        </div>
+
+        {ctaLabel && href && (
+          <SmartLink
+            href={href}
+            className={cn(
+              "inline-flex w-fit items-center gap-1.5 rounded-full px-4 py-2 text-sm font-semibold transition-colors",
+              styles.cta,
+            )}
+          >
+            {ctaLabel}
+            <ArrowUpRight className="h-4 w-4" />
+          </SmartLink>
+        )}
+      </div>
+    </div>
+  );
+}

src/context/filterContext.tsx

@@ -147,17 +147,22 @@ export const FilterProvider: React.FC<FilterProviderProps> = ({
       new Set(selectedPapers.map((paper) => paper._id)),
     ).map((id) => selectedPapers.find((paper) => paper._id === id)) as IPaper[];
 
-    for (const paper of uniquePapers) {
-      try {
-        console.log(paper);
-        const response = await fetch(getSecureUrl(paper.file_url));
-        const blob = await response.blob();
-        const filename = generateFileName(paper);
-        zip.file(filename, blob);
-      } catch (err) {
-        console.error(`Failed to fetch ${paper.file_url}`, err);
-      }
-    }
+    await Promise.all(
+       uniquePapers.map(async (paper) => {
+        try {
+          const response = await fetch(getSecureUrl(paper.file_url));
+          if (!response.ok) {
+            throw new Error(`HTTP ${response.status}`);
+          }
+          const blob = await response.blob();
+          const filename = generateFileName(paper);
+          zip.file(filename, blob);
+          } catch (err) {
+            console.error(`Failed to fetch ${paper.file_url}`, err);
+          }
+        }),
+    );   
+
     function getDownloadName(
       params: ReadonlyURLSearchParams,
       key: string,