diff --git a/css/style.css b/css/style.css
new file mode 100644
index 0000000..cd109f9
--- /dev/null
+++ b/css/style.css
@@ -0,0 +1,182 @@
+/* ===========================================
+   1. 通用响应式底座 (所有样式均需依赖)
+   =========================================== */
+:root {
+    --text-color: #333;
+    --paper-bg: #fff;
+    --wish-color: #333;
+    --border-color: #ddd;
+    --font-family-base: "Noto Serif SC", serif;
+    --font-family-sig: "Noto Serif SC", serif; /* 默认署名字体 */
+}
+
+body {
+    margin: 0;
+    padding: 20px;
+    background-color: #f6f6f6; /* 默认外背景 */
+    font-family: var(--font-family-base);
+    color: var(--text-color);
+    display: flex;
+    justify-content: center;
+    transition: background 0.3s;
+}
+
+/* 自适应容器 */
+.letter-container {
+    width: 100%;
+    max-width: 800px;
+    min-height: 85vh;
+    padding: 5% 7%;
+    box-sizing: border-box;
+    position: relative;
+    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
+    background-color: var(--paper-bg);
+    border: 1px solid var(--border-color);
+    transition: all 0.3s ease;
+}
+
+/* 手机端适配 */
+@media (max-width: 600px) {
+    body { padding: 10px; }
+    .letter-container { padding: 35px 20px; }
+}
+
+/* 传统书信格式公共逻辑 */
+.salutation {
+    font-size: 1.2rem;
+    margin-top: 0;
+    margin-bottom: 1.5rem;
+    font-weight: bold;
+}
+
+.content p {
+    text-indent: 2em; /* 首行缩进 */
+    line-height: 1.8;
+    text-align: justify;
+    margin-bottom: 1rem;
+}
+
+.closing { margin-top: 2.5rem; }
+.wish-prefix { text-indent: 2em; margin: 0; color: var(--wish-color); }
+.wish-suffix { font-weight: bold; margin-top: 5px; color: var(--wish-color); }
+
+.footer {
+    text-align: right;
+    margin-top: 4rem;
+    line-height: 1.6;
+}
+
+.signature {
+    font-size: 1.1em;
+    font-family: var(--font-family-sig);
+}
+
+/* ===========================================
+   2. 原始场景皮肤 (Modern, Traditional, Vintage)
+   =========================================== */
+/* ... (保留你之前的定义，此处略以节省空间，直接写新的) ... */
+.theme-modern { --paper-bg: #fff; border-top: 4px solid #333; }
+.theme-traditional { --paper-bg: #fdfaf2; writing-mode: vertical-rl; height: 650px; }
+@media (max-width: 600px) { .theme-traditional { writing-mode: horizontal-tb; height: auto; } }
+.theme-vintage { --paper-bg: #fff; border: 2px solid #b71c1c; background-image: repeating-linear-gradient(transparent, transparent 31px, rgba(183, 28, 28, 0.1) 31px, rgba(183, 28, 28, 0.1) 32px); line-height: 32px; --text-color: #b71c1c; --wish-color: #b71c1c; }
+
+
+/* ===========================================
+   3. [新增] 青春与多样场景皮肤
+   =========================================== */
+
+/* --- A. 青春派对 (Youthful) --- */
+/* 特点：明亮多彩、活力、柔和 */
+.theme-youth {
+    --paper-bg: #fff;
+    --text-color: #4a4a4a;
+    --wish-color: #ff6b6b; /* 鲜艳的颜色 */
+    --border-color: #ffe0e0;
+    font-family: "PingFang SC", "Microsoft YaHei", sans-serif; /* 使用现代无衬线字体 */
+    
+    border-radius: 15px; /* 圆角增加亲和力 */
+    border: 3px solid #ffe0e0;
+}
+
+/* 装饰：顶部和底部加点彩色条纹 */
+.theme-youth::before {
+    content: "";
+    position: absolute;
+    top: 0; left: 0; right: 0; height: 8px;
+    background: linear-gradient(90deg, #ff6b6b, #feca57, #48dbfb, #ff9f43);
+    border-radius: 15px 15px 0 0;
+}
+
+.theme-youth .salutation { color: #222; }
+.theme-youth .content p { text-indent: 0; text-align: left; background-color: #fcfcfc; padding: 10px; border-radius: 8px; margin-bottom: 1.2rem; } /* 类似气泡感 */
+.theme-youth .wish-prefix { text-indent: 0; padding-left: 1rem; } /* 青春风不一定强制缩进 */
+.theme-youth .wish-suffix { font-weight: 800; font-size: 1.1rem; }
+.theme-youth .footer { color: #888; }
+.theme-youth .signature { color: #333; font-weight: bold; }
+
+
+/* --- B. 青葱校园 (Campus) --- */
+/* 特点：数学格子纸、怀旧、清爽蓝调 */
+.theme-campus {
+    --paper-bg: #fdfdfd;
+    --text-color: #3e3e3e;
+    --wish-color: #2980b9; /* 校园蓝 */
+    --border-color: #87ceeb;
+    font-family: "SimSun", serif; /* 怀旧宋体 */
+    
+    /* 模拟蓝格子纸 */
+    background-image: 
+        linear-gradient(rgba(135, 206, 235, 0.3) 1px, transparent 1px),
+        linear-gradient(90deg, rgba(135, 206, 235, 0.3) 1px, transparent 1px);
+    background-size: 25px 25px; /* 格子大小 */
+}
+
+/* 顶部加一个类似书签或校徽的圆 */
+.theme-campus::after {
+    content: "CAMPUS";
+    position: absolute;
+    top: -15px; right: 30px;
+    background-color: #2980b9;
+    color: white;
+    padding: 5px 15px;
+    border-radius: 20px;
+    font-size: 0.8rem;
+    font-family: sans-serif;
+}
+
+.theme-campus .content p { line-height: 1.6; text-indent: 2em; }
+.theme-campus .closing { border-top: 1px dashed rgba(135, 206, 235, 0.5); padding-top: 1rem; }
+.theme-campus .footer .date { color: #888; }
+
+
+/* --- C. 极简和风 (Wabi-Sabi / Minimalist) --- */
+/* 特点：淡雅、素净、极低对比度、高端商务或长辈 */
+.theme-wabi {
+    --paper-bg: #fafafa;
+    --text-color: #555;
+    --wish-color: #777;
+    --border-color: transparent; /* 无边框 */
+    font-family: "Source Han Serif SC", serif; /* 高质量宋体 */
+    
+    background-color: #fff;
+    padding: 8% 10%; /* 更宽松的内边距 */
+    border-radius: 0;
+    box-shadow: none; /* 去掉阴影，极度扁平 */
+}
+
+/* 手机端去掉过于宽松的内边距 */
+@media (max-width: 600px) {
+    .theme-wabi { padding: 40px 20px; }
+}
+
+/* 装饰：只在底部加一条极淡的灰线 */
+.theme-wabi .footer {
+    text-align: right;
+    border-top: 1px solid #f0f0f0;
+    padding-top: 1.5rem;
+}
+
+.theme-wabi .salutation { font-weight: normal; font-size: 1.2rem; color: #333; }
+.theme-wabi .content p { text-indent: 2em; line-height: 2; color: #666; font-size: 0.95rem; }
+.theme-wabi .wish-suffix { font-weight: normal; color: #777; }
+.theme-wabi .signature { font-family: "Zhi Mang Xing", cursive; font-size: 1.8rem; color: #333; } /* 使用Google Font书法字体 */
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diff --git a/index.html b/index.html
index 2c84649..9c9f3d3 100644
--- a/index.html
+++ b/index.html
@@ -2,15 +2,21 @@
 <html lang="zh-CN">
 <head>
     <meta charset="UTF-8">
-    <link rel="stylesheet" href="./css/vintage.css"> <title>书信预览</title>
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>多彩场景信函</title>
+    <link href="https://fonts.googleapis.com/css2?family=Zhi+Mang+Xing&display=swap" rel="stylesheet">
+    <link rel="stylesheet" href="./css/style.css">
 </head>
 <body>
-    <div class="letter-container">
-        <h2 class="salutation">尊敬的[姓名/称谓]：</h2>
+
+    <div class="letter-container theme-campus">
+        
+        <h2 class="salutation">亲爱的[朋友/同学姓名]：</h2>
 
         <div class="content">
-            <p>展信佳。自上次一别，已有数月之久。每念及过往共同探讨之时光，心中倍感亲切。今日致信，旨在询问近况，并就此前所述之合作事宜，希望能有进一步之探讨。</p>
-            <p>岁序更新，愿君事事顺遂，阖家安康。</p>
+            <p>好久不见！最近过得怎么样？</p>
+            <p>转眼间夏天就要到了，还记得那时候我们一起在操场上挥洒汗水、在教室里畅谈未来的日子吗？那段时光，真的就像昨天刚发生一样。</p>
+            <p>这次致信，是想告诉你一个好消息。下周六我要举办一个久违的聚会，希望你一定要来！哪怕只是聊聊天，喝杯茶，也是极好的。时光易逝，友情常驻。愿你每天都充满活力，事事顺心！</p>
         </div>
 
         <div class="closing">
@@ -19,9 +25,11 @@
         </div>
 
         <div class="footer">
-            <p class="signature">[您的署名] 敬上</p>
+            <p class="signature">[您的署名]</p>
             <p class="date">2026年3月25日</p>
         </div>
+
     </div>
+
 </body>
 </html>
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