fix: Build LeetCode-style coding interface for DSA round

client/src/components/DSARound/DSARound.css

@@ -0,0 +1,317 @@
+/* ── Layout ── */
+.dsa-round {
+  display: flex;
+  height: 100vh;
+  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
+    Ubuntu, sans-serif;
+  background: #1a1a2e;
+  color: #e0e0e0;
+  overflow: hidden;
+}
+
+/* ── Sidebar ── */
+.dsa-sidebar {
+  width: 240px;
+  min-width: 200px;
+  background: #16213e;
+  border-right: 1px solid #0f3460;
+  display: flex;
+  flex-direction: column;
+  overflow-y: auto;
+}
+
+.dsa-sidebar__title {
+  padding: 16px;
+  font-size: 14px;
+  font-weight: 600;
+  text-transform: uppercase;
+  letter-spacing: 0.05em;
+  color: #8892b0;
+  border-bottom: 1px solid #0f3460;
+  margin: 0;
+}
+
+.dsa-problem-list {
+  list-style: none;
+  padding: 0;
+  margin: 0;
+}
+
+.dsa-problem-list__item {
+  display: flex;
+  align-items: center;
+  gap: 6px;
+  padding: 10px 16px;
+  cursor: pointer;
+  border-left: 3px solid transparent;
+  transition: background 0.15s, border-color 0.15s;
+  font-size: 13px;
+}
+
+.dsa-problem-list__item:hover {
+  background: #0f3460;
+}
+
+.dsa-problem-list__item--active {
+  background: #0f3460;
+  border-left-color: #e94560;
+}
+
+.dsa-problem-list__id {
+  color: #8892b0;
+  min-width: 24px;
+}
+
+.dsa-problem-list__name {
+  flex: 1;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.dsa-problem-list__difficulty {
+  font-size: 11px;
+  font-weight: 600;
+  white-space: nowrap;
+}
+
+/* ── Main panel ── */
+.dsa-main {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  overflow: hidden;
+}
+
+/* ── Description ── */
+.dsa-description {
+  flex: 0 0 auto;
+  max-height: 40%;
+  overflow-y: auto;
+  padding: 20px 24px;
+  background: #16213e;
+  border-bottom: 1px solid #0f3460;
+}
+
+.dsa-description__header {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+  margin-bottom: 12px;
+}
+
+.dsa-description__title {
+  font-size: 18px;
+  font-weight: 700;
+  margin: 0;
+}
+
+.dsa-description__badge {
+  padding: 2px 10px;
+  border-radius: 12px;
+  font-size: 12px;
+  font-weight: 600;
+  color: #1a1a2e;
+}
+
+.dsa-description__body {
+  font-size: 14px;
+  line-height: 1.7;
+  margin-bottom: 16px;
+}
+
+.dsa-example {
+  margin-bottom: 12px;
+  font-size: 13px;
+}
+
+.dsa-example__block {
+  background: #0f3460;
+  border-radius: 6px;
+  padding: 10px 14px;
+  margin-top: 6px;
+  font-family: "Fira Code", "Cascadia Code", monospace;
+  font-size: 12px;
+  white-space: pre-wrap;
+  word-break: break-word;
+}
+
+.dsa-constraints {
+  font-size: 13px;
+}
+
+.dsa-constraints ul {
+  margin: 6px 0 0 0;
+  padding-left: 20px;
+}
+
+.dsa-constraints li {
+  margin-bottom: 4px;
+}
+
+/* ── Editor ── */
+.dsa-editor-section {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  min-height: 0;
+  background: #1a1a2e;
+}
+
+.dsa-editor-toolbar {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: 8px 16px;
+  background: #16213e;
+  border-bottom: 1px solid #0f3460;
+}
+
+.dsa-editor-toolbar__lang {
+  font-size: 12px;
+  color: #8892b0;
+  font-weight: 500;
+}
+
+.dsa-editor-toolbar__actions {
+  display: flex;
+  gap: 8px;
+}
+
+.dsa-btn {
+  padding: 6px 16px;
+  border-radius: 6px;
+  border: none;
+  font-size: 13px;
+  font-weight: 600;
+  cursor: pointer;
+  transition: opacity 0.15s;
+}
+
+.dsa-btn:disabled {
+  opacity: 0.5;
+  cursor: not-allowed;
+}
+
+.dsa-btn--primary {
+  background: #e94560;
+  color: #fff;
+}
+
+.dsa-btn--primary:hover:not(:disabled) {
+  opacity: 0.85;
+}
+
+.dsa-btn--secondary {
+  background: #0f3460;
+  color: #e0e0e0;
+}
+
+.dsa-btn--secondary:hover {
+  opacity: 0.8;
+}
+
+.dsa-editor {
+  flex: 1;
+  resize: none;
+  background: #0d1117;
+  color: #c9d1d9;
+  border: none;
+  padding: 16px;
+  font-family: "Fira Code", "Cascadia Code", "Courier New", monospace;
+  font-size: 13px;
+  line-height: 1.6;
+  outline: none;
+  tab-size: 2;
+}
+
+/* ── Results ── */
+.dsa-results {
+  max-height: 30%;
+  overflow-y: auto;
+  padding: 12px 16px;
+  background: #16213e;
+  border-top: 1px solid #0f3460;
+}
+
+.dsa-results__global-error {
+  color: #ff375f;
+  font-size: 13px;
+  background: rgba(255, 55, 95, 0.1);
+  padding: 10px 14px;
+  border-radius: 6px;
+}
+
+.dsa-results__summary {
+  font-size: 14px;
+  font-weight: 600;
+  margin-bottom: 10px;
+}
+
+.dsa-results__summary--pass {
+  color: #00b8a3;
+}
+
+.dsa-results__summary--fail {
+  color: #ff375f;
+}
+
+.dsa-test-cases {
+  display: flex;
+  flex-direction: column;
+  gap: 8px;
+}
+
+.dsa-test-case {
+  border-radius: 6px;
+  overflow: hidden;
+  font-size: 12px;
+}
+
+.dsa-test-case--pass {
+  border: 1px solid #00b8a3;
+}
+
+.dsa-test-case--fail {
+  border: 1px solid #ff375f;
+}
+
+.dsa-test-case__header {
+  padding: 6px 12px;
+  font-weight: 600;
+}
+
+.dsa-test-case--pass .dsa-test-case__header {
+  background: rgba(0, 184, 163, 0.15);
+}
+
+.dsa-test-case--fail .dsa-test-case__header {
+  background: rgba(255, 55, 95, 0.15);
+}
+
+.dsa-test-case__body {
+  padding: 8px 12px;
+  display: flex;
+  flex-direction: column;
+  gap: 4px;
+  background: rgba(255, 255, 255, 0.03);
+}
+
+.dsa-test-case__label {
+  color: #8892b0;
+  font-weight: 600;
+}
+
+/* ── Scrollbars ── */
+.dsa-sidebar::-webkit-scrollbar,
+.dsa-description::-webkit-scrollbar,
+.dsa-results::-webkit-scrollbar {
+  width: 6px;
+}
+
+.dsa-sidebar::-webkit-scrollbar-thumb,
+.dsa-description::-webkit-scrollbar-thumb,
+.dsa-results::-webkit-scrollbar-thumb {
+  background: #0f3460;
+  border-radius: 3px;
+}