Picta rebrand: remove all clone/Imgur UI strings, wire /logo.svg, simplify upload (Share CTA, full-page drag overlay, body-scroll lock), scrollbar elimination (hidden tracks, overflow-x hidden, break-word, modal internal scroll)

public/css/style.css

@@ -62,6 +62,10 @@
   --text-3xl: 24px;
 }
 
+html, body {
+  overflow-x: hidden;
+}
+
 body {
   font-family: var(--font-family);
   background: var(--bg-primary);
@@ -73,6 +77,19 @@ body {
   -moz-osx-font-smoothing: grayscale;
 }
 
+body.modal-open {
+  overflow: hidden;
+}
+
+/* Hide scrollbar tracks but keep scrollability */
+* {
+  scrollbar-width: none; /* Firefox */
+  -ms-overflow-style: none; /* IE/Edge */
+}
+*::-webkit-scrollbar {
+  display: none; /* WebKit */
+}
+
 /* ===== Focus Visible ===== */
 :focus-visible {
   outline: 2px solid var(--accent-green);
@@ -116,8 +133,11 @@ body {
   opacity: 0.85;
 }
 
-.logo-icon {
-  font-size: 28px;
+.logo-img {
+  width: 28px;
+  height: 28px;
+  border-radius: 6px;
+  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3));
 }
 
 .logo-text {
@@ -304,6 +324,8 @@ body {
 
 .post-card-image {
   width: 100%;
+  max-width: 100%;
+  height: auto;
   aspect-ratio: 4/3;
   object-fit: cover;
   display: block;
@@ -324,6 +346,8 @@ body {
   -webkit-box-orient: vertical;
   overflow: hidden;
   letter-spacing: -0.01em;
+  overflow-wrap: break-word;
+  word-break: break-word;
 }
 
 .post-card-stats {
@@ -410,9 +434,14 @@ body {
   max-width: 560px;
   max-height: 90vh;
   overflow-y: auto;
+  overflow-x: hidden;
   border: 1px solid var(--border-color);
   box-shadow: var(--shadow-lg);
   animation: modalIn 200ms ease;
+  scrollbar-width: none;
+}
+.modal::-webkit-scrollbar {
+  display: none;
 }
 
 @keyframes modalIn {
@@ -652,6 +681,9 @@ body {
 
 .post-image-container img {
   width: 100%;
+  max-width: 100%;
+  height: auto;
+  display: block;
   border-radius: var(--radius);
   cursor: zoom-in;
   box-shadow: var(--shadow);
@@ -815,6 +847,8 @@ body {
   font-size: var(--text-base);
   color: var(--text-secondary);
   line-height: 1.5;
+  overflow-wrap: break-word;
+  word-break: break-word;
 }
 
 .comment-time {
@@ -922,6 +956,43 @@ body {
   }
 }
 
+/* ===== Full-Page Drag Overlay ===== */
+.drag-overlay {
+  display: none;
+  position: fixed;
+  inset: 0;
+  background: rgba(20, 20, 28, 0.92);
+  backdrop-filter: blur(6px);
+  z-index: 5000;
+  align-items: center;
+  justify-content: center;
+  pointer-events: none;
+}
+
+.drag-overlay.active {
+  display: flex;
+}
+
+.drag-overlay-inner {
+  text-align: center;
+  padding: var(--space-10) var(--space-9);
+  border: 3px dashed var(--accent-green);
+  border-radius: var(--radius-xl);
+  background: rgba(27, 183, 110, 0.06);
+}
+
+.drag-overlay-icon {
+  font-size: 56px;
+  margin-bottom: var(--space-4);
+}
+
+.drag-overlay-text {
+  font-size: var(--text-2xl);
+  font-weight: 700;
+  color: var(--accent-green);
+  letter-spacing: -0.02em;
+}
+
 /* ===== Responsive ===== */
 @media (max-width: 1024px) {
   .post-detail-grid {