style(dnfs): 打磨首页 index 视觉细节，保持朴素风格

static/public/css/index.css

@@ -61,7 +61,11 @@ body {
 }
 
 .header h1 {
+    display: flex;
+    align-items: center;
     font-size: 1.15rem;
+    font-weight: 700;
+    letter-spacing: 0.01em;
     cursor: pointer;
     user-select: none;
     transition: color 0.15s;
@@ -95,7 +99,7 @@ body {
 .hero {
     position: relative;
     text-align: center;
-    padding: 4rem 1rem 3rem;
+    padding: 5.5rem 1rem 4.5rem;
 }
 .hero::before {
     content: "";
@@ -106,96 +110,126 @@ body {
 }
 .hero > * { position: relative; }
 .hero-title {
-    font-size: clamp(1.8rem, 5vw, 2.6rem);
+    font-size: clamp(2rem, 6vw, 3rem);
     font-weight: 800;
-    line-height: 1.35;
+    line-height: 1.28;
     letter-spacing: 0.02em;
-    margin-bottom: 0.75rem;
+    margin-bottom: 1rem;
+}
+.accent-text {
+    background: linear-gradient(120deg, var(--accent) 20%, var(--accent-dark) 80%);
+    -webkit-background-clip: text;
+    background-clip: text;
+    color: transparent;
 }
-.accent-text { color: var(--accent); }
 .hero-sub {
-    font-size: 1.05rem;
+    font-size: 1.08rem;
     color: var(--fg-secondary);
+    max-width: 30rem;
+    margin: 0 auto;
+    line-height: 1.7;
 }
 .hero-actions {
     display: flex;
     justify-content: center;
     flex-wrap: wrap;
-    gap: 0.75rem;
+    gap: 0.85rem;
-    margin-top: 1.75rem;
+    margin-top: 2.1rem;
 }
 
 /* ===== 特性卡片 ===== */
 .section-title {
     text-align: center;
-    margin-top: 3rem;
+    margin-top: 4rem;
+    font-size: 1.5rem;
+    font-weight: 700;
+    letter-spacing: 0.01em;
+}
+.section-title::after {
+    content: "";
+    display: block;
+    width: 44px;
+    height: 3px;
+    margin: 0.6rem auto 0;
+    border-radius: 2px;
+    background: var(--accent);
+    opacity: 0.85;
 }
 .features {
     display: grid;
-    grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
+    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
-    gap: 0.9rem;
+    gap: 1.1rem;
     width: 100%;
     max-width: 960px;
-    margin: 0 auto;
+    margin: 1.75rem auto 0;
 }
 .feature-card {
     background: var(--card);
     border: 1px solid var(--border-light);
     border-radius: var(--radius-md);
-    padding: 1.4rem 1.25rem;
+    padding: 1.6rem 1.35rem;
     box-shadow: var(--shadow-sm);
     transition: transform 0.18s, box-shadow 0.2s, border-color 0.2s;
 }
 .feature-card:hover {
-    transform: translateY(-3px);
+    transform: translateY(-4px);
-    border-color: var(--border);
+    border-color: var(--accent);
     box-shadow: var(--shadow-md);
 }
 .feature-icon {
     display: flex;
     align-items: center;
     justify-content: center;
-    width: 38px;
+    width: 42px;
-    height: 38px;
+    height: 42px;
-    margin-bottom: 0.75rem;
+    margin-bottom: 0.85rem;
     border-radius: var(--radius-sm);
     background: var(--accent-soft);
     color: var(--accent-dark);
 }
-.feature-icon svg { width: 20px; height: 20px; }
+.feature-icon svg { width: 22px; height: 22px; }
-.feature-card h3 { margin-bottom: 0.35rem; }
+.feature-card h3 { margin-bottom: 0.4rem; font-size: 1.05rem; }
 .feature-card p {
-    font-size: 0.86rem;
+    font-size: 0.88rem;
-    line-height: 1.65;
+    line-height: 1.7;
     color: var(--fg-secondary);
 }
 
 /* ===== 关于本站 ===== */
 .about {
     text-align: center;
-    padding-bottom: 2rem;
+    padding: 1rem 1rem 3rem;
+    max-width: 760px;
+    margin: 0 auto;
+}
+.about .site-intro {
+    background: var(--card);
+    border: 1px solid var(--border-light);
+    border-radius: var(--radius-md);
+    box-shadow: var(--shadow-sm);
+    padding: 1.75rem 1.9rem;
 }
 .site-intro {
-    max-width: 640px;
+    font-size: 0.96rem;
-    margin: 0 auto;
+    line-height: 1.95;
-    font-size: 0.95rem;
-    line-height: 1.9;
     color: var(--fg-secondary);
 }
 .quick-links {
     display: flex;
     justify-content: center;
     flex-wrap: wrap;
-    gap: 1.25rem;
+    gap: 1.5rem;
-    margin-top: 1.5rem;
+    margin-top: 1.75rem;
 }
 .quick-links a {
-    font-size: 0.85rem;
+    font-size: 0.86rem;
     color: var(--muted);
     text-decoration: none;
-    transition: color 0.15s;
+    padding-bottom: 1px;
+    border-bottom: 1px solid transparent;
+    transition: color 0.15s, border-color 0.15s;
 }
-.quick-links a:hover { color: var(--accent); }
+.quick-links a:hover { color: var(--accent); border-bottom-color: var(--accent); }
 
 /* ===== 入场动画 ===== */
 @keyframes fade-up {

static/public/index.html

@@ -13,7 +13,10 @@
 </head>
 <body>
     <header class="header">
-        <h1 id="logo">DNFS 树状笔记</h1>
+        <h1 id="logo">
+            <svg viewBox="0 0 24 24" width="16" height="16" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" style="vertical-align:-2px;margin-right:6px;color:var(--accent)"><circle cx="18" cy="5" r="3"/><circle cx="6" cy="12" r="3"/><circle cx="18" cy="19" r="3"/><line x1="8.59" y1="10.51" x2="15.42" y2="6.51"/><line x1="8.59" y1="13.49" x2="15.42" y2="17.49"/></svg>
+            DNFS 树状笔记
+        </h1>
         <nav class="right-group" aria-label="用户操作">
             <img src="favicon.ico" alt="用户头像" id="avatar" style="display:none">
             <b id="name" style="display:none"></b>