随机发病，运势，冷笑话，段子

frontend/60sapi/娱乐消遣/随机冷笑话/css/background.css

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+/* background.css - 动态渐变背景 */
+body {
+    background: linear-gradient(-45deg, #ee7752, #e73c7e, #23a6d5, #23d5ab);
+    background-size: 400% 400%;
+    animation: gradient 15s ease infinite;
+}
+
+@keyframes gradient {
+    0% {
+        background-position: 0% 50%;
+    }
+    50% {
+        background-position: 100% 50%;
+    }
+    100% {
+        background-position: 0% 50%;
+    }
+}
+:root {
+    --bg-yellow: #FFFDE7; /* 浅黄 */
+    --bg-blue:   #E3F2FD; /* 淡蓝 */
+}
+
+body {
+    background: linear-gradient(180deg, var(--bg-yellow) 0%, var(--bg-blue) 100%);
+    background-attachment: fixed; /* 固定背景，滚动时不移动 */
+}
+
+body {
+    margin: 0;
+    padding: 0;
+    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
+    overflow: hidden;
+    transition: background-color 0.5s ease;
+}
+
+/* Light Theme (Default) */
+[data-theme="light"] {
+    background: linear-gradient(to bottom, #87CEEB, #B0E0E6);
+}
+
+/* Dark Theme */
+[data-theme="dark"] {
+    background: linear-gradient(to bottom, #232526, #414345);
+}
+[data-theme="dark"] .snowflake {
+    color: #999;
+}
+
+/* Winter Theme */
+[data-theme="winter"] {
+    background: linear-gradient(to bottom, #a1c4fd, #c2e9fb);
+}
+[data-theme="winter"] .background-bottom {
+    position: fixed;
+    bottom: 0;
+    left: 0;
+    width: 100%;
+    height: 100px;
+    background: linear-gradient(to top, white, rgba(255, 255, 255, 0));
+    z-index: -1;
+    border-radius: 50% 50% 0 0 / 20px;
+    box-shadow: 0 -10px 20px rgba(255, 255, 255, 0.5);
+}
+
+
+#snowflake-container {
+    position: fixed;
+    top: 0;
+    left: 0;
+    width: 100%;
+    height: 100%;
+    pointer-events: none;
+    z-index: 0;
+}
+
+.snowflake {
+    position: absolute;
+    top: -10%;
+    color: white;
+    font-size: 20px;
+    user-select: none;
+    animation: fall linear infinite;
+}
+
+@keyframes fall {
+    to {
+        transform: translateY(105vh) rotate(360deg);
+    }
+}
+
+#frost-overlay {
+    position: fixed;
+    top: 0;
+    left: 0;
+    width: 100%;
+    height: 100%;
+    background: url('https://www.transparenttextures.com/patterns/ice-age.png') repeat;
+    opacity: 0;
+    pointer-events: none;
+    transition: opacity 0.5s ease-in-out;
+    z-index: 100;
+}
+
+#frost-overlay.is-frosted {
+    opacity: 0.3;
+}