Bigger content (+40%) and scroll-snap on sections

- html font-size 22.4px scales rem-based typography
- scroll-snap-type: y proximity on html
- snap-align start on hero/sections/dark-section
- scroll-margin-top 84px to clear sticky nav

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

index.html

@@ -106,7 +106,20 @@
   }
 }
 
-html { scroll-behavior: smooth; }
+html {
+  scroll-behavior: smooth;
+  font-size: 22.4px; /* +40% от 16px — крупнее контент */
+  scroll-snap-type: y proximity;
+}
+
+/* Scroll-snap по основным секциям */
+.hero,
+section.section,
+.dark-section {
+  scroll-snap-align: start;
+  scroll-snap-stop: always;
+  scroll-margin-top: 84px; /* высота sticky-нав */
+}
 
 /* ── POLISH: shared hover transition for all card variants ── */
 .tool-card, .create-card, .plan-step, .gloss-item, .project-card, .prompt-card, .eq-box {