Embed eVS application webinar video at top of the eVS guide page

Adds a reusable {video} block (responsive 16:9 youtube-nocookie embed) rendered as a prominent orange callout with title and caption, placed right after the warning box on evs-application-guide so students see it first. Trilingual title/caption.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

css/pages/_guide.css

@@ -318,6 +318,52 @@
     margin-right: 8px;
 }
 
+/* ---------- Embedded video (webinar) ---------- */
+.guide-video {
+    margin: 24px 0 28px;
+    padding: 18px;
+    border: 1px solid #ffd7c2;
+    border-left: 5px solid #ff6b2c;
+    border-radius: 14px;
+    background: linear-gradient(180deg, #fff7f2 0%, #ffffff 60%);
+    box-shadow: 0 10px 26px rgba(255, 107, 44, .12);
+}
+.guide-video-title {
+    display: flex;
+    align-items: center;
+    gap: 10px;
+    margin: 0 0 14px;
+    font-size: 18px;
+    font-weight: 700;
+    color: #101828;
+    line-height: 24px;
+}
+.guide-video-title i {
+    color: #ff6b2c;
+    font-size: 22px;
+    flex-shrink: 0;
+}
+.guide-video-frame {
+    position: relative;
+    width: 100%;
+    aspect-ratio: 16 / 9;
+    border-radius: 10px;
+    overflow: hidden;
+    background: #000;
+}
+.guide-video-frame iframe {
+    position: absolute;
+    inset: 0;
+    width: 100%;
+    height: 100%;
+    border: 0;
+}
+.guide-video-caption {
+    margin: 14px 0 0;
+    color: #475467;
+    line-height: 24px;
+}
+
 /* ---------- Still need help? ---------- */
 .guide-help {
     max-width: 860px;