feat(home): 去紫色,改中性暖白底 + 墨黑主色

整页底色 #fafaf8，按钮/CTA/导航激活态改墨黑，
标题渐变改黑灰，占位图换低饱和纸感色板，
去掉彩色光晕与漂移光斑。

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

frontend/public/showcase/hero-1.svg

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frontend/public/showcase/hero-2.svg

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frontend/public/showcase/hero-3.svg

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frontend/public/showcase/hero-4.svg

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frontend/public/showcase/work-1.svg

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frontend/public/showcase/work-2.svg

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frontend/public/showcase/work-3.svg

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frontend/public/showcase/work-7.svg

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-    <linearGradient id="g" x1="0" y1="0" x2="1" y2="1"><stop offset="0%" stop-color="#a855f7"/><stop offset="100%" stop-color="#6366f1"/></linearGradient>
-    <radialGradient id="b1" cx="0.3" cy="0.25" r="0.7"><stop offset="0%" stop-color="#e9d5ff" stop-opacity="0.5"/><stop offset="100%" stop-color="#e9d5ff" stop-opacity="0"/></radialGradient>
-    <radialGradient id="b2" cx="0.75" cy="0.75" r="0.6"><stop offset="0%" stop-color="#ffffff" stop-opacity="0.28"/><stop offset="100%" stop-color="#ffffff" stop-opacity="0"/></radialGradient>
-  </defs>
-  <rect width="800" height="534" fill="url(#g)"/>
-  <rect width="800" height="534" fill="url(#b1)"/>
-  <rect width="800" height="534" fill="url(#b2)"/>
-  <circle cx="576" cy="160.2" r="72" fill="rgba(255,255,255,0.5)"/>
-  <path d="M0 331.08 Q 240 267 440.00000000000006 331.08 T 800 293.70000000000005 V 534 H0 Z" fill="rgba(255,255,255,0.12)"/>
-  <path d="M0 384.47999999999996 Q 280 320.4 480 384.47999999999996 T 800 352.44 V 534 H0 Z" fill="rgba(255,255,255,0.1)"/>
-</svg>

frontend/src/layouts/PublicLayout.vue

@@ -259,6 +259,8 @@ html.dark .nav-inner { box-shadow: 0 8px 30px -14px rgb(0 0 0 / 0.5); }
 }
 .top-link:active { transform: scale(0.95); }
 .top-link:hover { color: var(--fg); background: var(--hover); }
+.home-bg .top-link.on { color: #18181b; background: rgba(24, 24, 27, 0.07); }
+.home-bg .brand-spark { display: none; }
 .top-link.on {
   color: var(--m-orange);
   font-weight: 700;
@@ -314,15 +316,15 @@ html.dark .nav-inner { box-shadow: 0 8px 30px -14px rgb(0 0 0 / 0.5); }
 .round-btn:hover { color: var(--fg); background: var(--hover); border-color: rgb(124 92 252 / 0.4); box-shadow: 0 4px 14px rgb(124 92 252 / 0.16); transform: translateY(-1px); }
 /* 首页整页淡紫渐变底（铺满整个页面高度） */
 .home-bg {
-  background: linear-gradient(180deg, #f6f2ff 0%, #f1ecfe 28%, #f3f0fe 60%, #eef1fe 100%) !important;
+  background: #fafaf8 !important;
 }
 /* 游客登录入口：vivid 同款渐变胶囊 */
 .login-pill {
   display: inline-flex; align-items: center;
   padding: 8px 18px; border: none; border-radius: 999px;
-  background: linear-gradient(135deg, #8b5cf6 0%, #4f46e5 100%);
+  background: #18181b;
   color: #fff; font-family: inherit; font-size: 13px; font-weight: 700;
-  cursor: pointer; box-shadow: 0 10px 26px -8px rgba(109, 77, 242, 0.55);
+  cursor: pointer; box-shadow: 0 8px 20px -8px rgba(9, 9, 11, 0.5);
   transition: transform 0.15s ease, filter 0.2s ease;
 }
 .login-pill:hover { transform: translateY(-1px); filter: brightness(1.08); }

frontend/src/views/HomeView.vue

@@ -323,12 +323,12 @@ async function copyQqGroup() {
   --surface-3: #e9e9ec;
   --hairline: rgba(15, 23, 42, 0.08);
   --hover: rgba(15, 23, 42, 0.05);
-  --accent: #6d4df2;
+  --accent: #18181b;
-  --accent-strong: #4f2fd8;
+  --accent-strong: #18181b;
-  --primary-soft: rgba(109, 77, 242, 0.09);
+  --primary-soft: rgba(24, 24, 27, 0.06);
-  --grad: linear-gradient(135deg, #8b5cf6 0%, #4f46e5 100%);
+  --grad: linear-gradient(135deg, #27272a 0%, #09090b 100%);
   --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04), 0 1px 3px rgba(15, 23, 42, 0.05);
-  --shadow-glow: 0 10px 26px -8px rgba(109, 77, 242, 0.55);
+  --shadow-glow: 0 10px 24px -10px rgba(9, 9, 11, 0.5);
   --ease: cubic-bezier(0.25, 0.1, 0.25, 1);
   --font-display: ui-sans-serif, system-ui, sans-serif;
   position: relative;
@@ -349,27 +349,7 @@ async function copyQqGroup() {
   position: absolute;
   inset: 0;
   pointer-events: none;
-  overflow: hidden;
+  background: radial-gradient(900px 520px at 70% 10%, rgba(244, 114, 52, 0.07), transparent 70%);
-  -webkit-mask-image: linear-gradient(to bottom, #000 70%, transparent 100%);
-  mask-image: linear-gradient(to bottom, #000 70%, transparent 100%);
-  background:
-    radial-gradient(760px 480px at 8% 4%, rgba(139, 92, 246, 0.16), transparent 70%),
-    radial-gradient(700px 480px at 92% 12%, rgba(59, 130, 246, 0.13), transparent 70%),
-    radial-gradient(520px 360px at 55% 100%, rgba(236, 72, 153, 0.09), transparent 70%);
-}
-.hero-bg::before,
-.hero-bg::after {
-  content: '';
-  position: absolute;
-  border-radius: 50%;
-  filter: blur(70px);
-  animation: drift 14s ease-in-out infinite alternate;
-}
-.hero-bg::before { width: 340px; height: 340px; left: 38%; top: 8%; background: rgba(167, 139, 250, 0.35); }
-.hero-bg::after { width: 300px; height: 300px; right: 6%; bottom: 4%; background: rgba(125, 211, 252, 0.3); animation-delay: -6s; }
-@keyframes drift {
-  from { transform: translate(0, 0) scale(1); }
-  to { transform: translate(30px, -24px) scale(1.12); }
 }
 .hero-wrap {
   position: relative;
@@ -400,7 +380,7 @@ async function copyQqGroup() {
   position: absolute;
   inset: 8% -6% 6% -4%;
   border-radius: 50%;
-  background: radial-gradient(closest-side, rgba(124, 92, 245, 0.16), transparent);
+  background: radial-gradient(closest-side, rgba(24, 24, 27, 0.16), transparent);
   filter: blur(30px);
   z-index: -1;
 }
@@ -506,11 +486,11 @@ html.dark .art { border-color: var(--ink-soft); }
   padding: 7px 16px;
   border-radius: 999px;
   background: var(--surface);
-  border: 1px solid rgba(109, 77, 242, 0.22);
+  border: 1px solid rgba(24, 24, 27, 0.22);
   font-size: 12.5px;
   font-weight: 600;
   color: var(--fg-2);
-  box-shadow: 0 2px 10px rgba(109, 77, 242, 0.08);
+  box-shadow: 0 2px 10px rgba(24, 24, 27, 0.08);
 }
 .badge-dot {
   width: 7px;
@@ -531,7 +511,7 @@ html.dark .art { border-color: var(--ink-soft); }
 }
 .outline {
   color: transparent;
-  background: linear-gradient(115deg, #7c5cf5, #4f46e5);
+  background: linear-gradient(115deg, #18181b, #71717a);
   -webkit-background-clip: text;
   background-clip: text;
 }
@@ -559,12 +539,12 @@ html.dark .art { border-color: var(--ink-soft); }
   border: 1.5px solid transparent;
   background:
     linear-gradient(var(--surface-solid), var(--surface-solid)) padding-box,
-    linear-gradient(100deg, #8b5cf6, #6366f1 55%, #ec4899) border-box;
+    linear-gradient(#e4e4e7, #e4e4e7) border-box;
-  box-shadow: 0 16px 44px -14px rgba(109, 77, 242, 0.35);
+  box-shadow: 0 16px 44px -14px rgba(24, 24, 27, 0.35);
   transition: box-shadow 0.25s ease;
 }
 .composer:focus-within {
-  box-shadow: 0 0 0 4px rgba(109, 77, 242, 0.1), 0 20px 54px -12px rgba(109, 77, 242, 0.45);
+  box-shadow: 0 0 0 4px rgba(24, 24, 27, 0.1), 0 20px 54px -12px rgba(24, 24, 27, 0.45);
 }
 .composer-icon {
   width: 18px;
@@ -636,8 +616,8 @@ html.dark .art { border-color: var(--ink-soft); }
 }
 .tip:hover {
   color: var(--accent);
-  border-color: rgba(109, 77, 242, 0.45);
+  border-color: rgba(24, 24, 27, 0.45);
-  background: rgba(109, 77, 242, 0.04);
+  background: rgba(24, 24, 27, 0.04);
   transform: translateY(-1px);
 }
 
@@ -739,30 +719,28 @@ html.dark .art { border-color: var(--ink-soft); }
   grid-column: span 2;
   position: relative;
   overflow: hidden;
-  background: linear-gradient(135deg, rgba(139, 92, 246, 0.07), rgba(99, 102, 241, 0.03) 60%, var(--surface));
+  background: linear-gradient(135deg, rgba(24, 24, 27, 0.07), rgba(99, 102, 241, 0.03) 60%, var(--surface));
 }
 .feature:nth-child(4):last-child { grid-column: span 2; }
 .feature:nth-child(3):last-child { grid-column: span 3; }
 .feature:nth-child(5) {
-  background: linear-gradient(315deg, rgba(236, 72, 153, 0.05), rgba(245, 158, 11, 0.04) 60%, var(--surface));
+  background: var(--surface);
 }
 .feature:hover {
   transform: translateY(-4px);
-  border-color: rgba(109, 77, 242, 0.35);
+  border-color: rgba(24, 24, 27, 0.35);
-  box-shadow: 0 18px 40px rgba(109, 77, 242, 0.12);
+  box-shadow: 0 18px 40px rgba(24, 24, 27, 0.12);
 }
+.f-icon :deep(svg), .f-icon svg { color: #18181b; }
 .f-icon {
   display: grid;
   place-items: center;
   width: 40px;
   height: 40px;
   border-radius: 12px;
-  background: rgba(139, 92, 246, 0.12);
+  background: rgba(24, 24, 27, 0.12);
   color: #7c3aed;
 }
-.feature:nth-child(2) .f-icon { background: rgba(59, 130, 246, 0.12); color: #2563eb; }
-.feature:nth-child(3) .f-icon { background: rgba(236, 72, 153, 0.1); color: #db2777; }
-.feature:nth-child(4) .f-icon { background: rgba(245, 158, 11, 0.12); color: #d97706; }
 .feature h3 {
   margin-top: 16px;
   font-size: 15.5px;
@@ -812,7 +790,7 @@ html.dark .art { border-color: var(--ink-soft); }
 }
 .work-card:hover {
   transform: translateY(-4px);
-  box-shadow: 0 18px 40px rgba(109, 77, 242, 0.16);
+  box-shadow: 0 18px 40px rgba(24, 24, 27, 0.16);
 }
 .work-card img {
   width: 100%;
@@ -842,8 +820,8 @@ html.dark .art { border-color: var(--ink-soft); }
 .work-cta {
   aspect-ratio: 3 / 2;
   border-radius: 18px;
-  border: 1.5px dashed rgba(109, 77, 242, 0.35);
+  border: 1.5px dashed rgba(24, 24, 27, 0.35);
-  background: rgba(109, 77, 242, 0.04);
+  background: rgba(24, 24, 27, 0.04);
   display: flex;
   flex-direction: column;
   align-items: center;
@@ -856,8 +834,8 @@ html.dark .art { border-color: var(--ink-soft); }
   transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s var(--ease);
 }
 .work-cta:hover {
-  background: rgba(109, 77, 242, 0.08);
+  background: rgba(24, 24, 27, 0.08);
-  border-color: rgba(109, 77, 242, 0.55);
+  border-color: rgba(24, 24, 27, 0.55);
   border-style: solid;
   transform: translateY(-3px);
 }
@@ -906,7 +884,7 @@ html.dark .art { border-color: var(--ink-soft); }
   margin: 40px auto 0;
   padding: 72px 32px;
   border-radius: 28px;
-  background: linear-gradient(135deg, #7c5cf5 0%, #4f46e5 100%);
+  background: linear-gradient(135deg, #27272a 0%, #09090b 100%);
   text-align: center;
   position: relative;
   overflow: hidden;
@@ -957,7 +935,7 @@ html.dark .art { border-color: var(--ink-soft); }
   border-radius: 999px;
   font-size: 14.5px;
   font-weight: 700;
-  color: #4f46e5;
+  color: #18181b;
   background: #fff;
   text-decoration: none;
   box-shadow: 0 14px 34px -10px rgba(30, 20, 90, 0.45);
@@ -1041,7 +1019,7 @@ html.dark .art { border-color: var(--ink-soft); }
   background: var(--accent);
   border-color: var(--accent);
   transform: translateY(-2px);
-  box-shadow: 0 8px 18px -6px rgba(109, 77, 242, 0.45);
+  box-shadow: 0 8px 18px -6px rgba(24, 24, 27, 0.45);
 }
 .f-col {
   display: flex;