feat(saju-ui-v2): shell.css — paper/night/mt-wash 배경 + screenIn/paw-bob 애니메이션

src/pages/saju/_shell/shell.css

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+/* 호령 사주 v2 — 배경 + ornament + animation */
+
+/* paper texture */
+.saju-v2 .paper-bg {
+  background:
+    radial-gradient(ellipse at top, rgba(212, 175, 55, 0.06), transparent 60%),
+    radial-gradient(ellipse at bottom, rgba(106, 76, 124, 0.04), transparent 60%),
+    linear-gradient(180deg, var(--ivory) 0%, var(--ivory-soft) 100%);
+  position: relative;
+}
+.saju-v2 .paper-bg::after {
+  content: '';
+  position: absolute; inset: 0; pointer-events: none;
+  background-image:
+    radial-gradient(circle at 20% 30%, rgba(180, 140, 80, 0.04) 0, transparent 40%),
+    radial-gradient(circle at 80% 70%, rgba(180, 140, 80, 0.04) 0, transparent 40%);
+}
+
+/* night sky */
+.saju-v2 .night-bg {
+  background:
+    radial-gradient(ellipse 80% 50% at 30% 20%, rgba(232, 199, 107, 0.18), transparent 60%),
+    radial-gradient(ellipse 60% 40% at 80% 80%, rgba(106, 76, 124, 0.3), transparent 60%),
+    linear-gradient(180deg, var(--navy-deep) 0%, var(--navy) 55%, #1A2238 100%);
+  position: relative;
+  color: var(--ivory);
+}
+
+/* mountain wash (desktop hero) */
+.saju-v2 .mt-wash {
+  position: relative;
+  background:
+    radial-gradient(ellipse 70% 50% at 10% 80%, rgba(31, 42, 68, 0.06), transparent 65%),
+    radial-gradient(ellipse 60% 40% at 90% 70%, rgba(31, 42, 68, 0.05), transparent 65%),
+    radial-gradient(ellipse 100% 60% at 50% 100%, rgba(212, 175, 55, 0.04), transparent 70%),
+    linear-gradient(180deg, var(--ivory-soft) 0%, #F4ECDB 100%);
+}
+.saju-v2 .mt-wash::before,
+.saju-v2 .mt-wash::after {
+  content: ''; position: absolute; pointer-events: none;
+  background-repeat: no-repeat; opacity: 0.35; background-size: contain;
+}
+.saju-v2 .mt-wash::before {
+  left: 0; bottom: 0; width: 320px; height: 160px;
+  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 320 160' fill='none' stroke='%231F2A44' stroke-width='1' opacity='0.45'><path d='M0 150 L40 90 L80 120 L130 60 L180 110 L220 80 L260 120 L310 70 L320 100 L320 160 L0 160 Z'/><path d='M30 130 L70 100 L110 130 L150 95 L200 120 L240 100 L280 120 L320 110' opacity='0.6'/></svg>");
+}
+.saju-v2 .mt-wash::after {
+  right: 0; bottom: 0; width: 380px; height: 180px;
+  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 380 180' fill='none' stroke='%231F2A44' stroke-width='1' opacity='0.4'><path d='M0 160 L50 100 L100 140 L160 70 L220 130 L280 90 L330 140 L380 110 L380 180 L0 180 Z'/></svg>");
+}
+
+/* screen entry */
+@keyframes saju-screen-in {
+  from { transform: translateY(6px); opacity: 0.8; }
+  to   { transform: translateY(0); opacity: 1; }
+}
+.saju-v2 .screen-in {
+  animation: saju-screen-in 0.3s cubic-bezier(0.16, 1, 0.3, 1) both;
+}
+
+/* paw bob */
+@keyframes saju-paw-bob {
+  0%, 100% { transform: translateY(0); }
+  50%      { transform: translateY(-2px); }
+}
+.saju-v2 .paw-bob {
+  animation: saju-paw-bob 2.4s ease-in-out infinite;
+  display: inline-block;
+}
+
+/* page container */
+.saju-v2 .page {
+  min-height: 100vh;
+  padding-bottom: var(--bottom-nav-h);
+}
+@media (min-width: 1024px) {
+  .saju-v2 .page {
+    padding-bottom: 0;
+    padding-top: var(--desktop-header-h);
+  }
+}