:root{
  --primary:#4f46e5;          /* 主色 · 靛蓝 */
  --primary-2:#7c3aed;        /* 辅助 · 紫 */
  --primary-d:#4338ca;
  --primary-l:#eef2ff;
  --accent:#f59e0b;           /* 点缀 · 晨金色，呼应"白曜" */
  --ink:#0f172a;
  --ink-2:#475569;
  --ink-3:#8b98ab;
  --bg:#ffffff;
  --bg-2:#f6f8fc;
  --line:#e5e9f0;
  --grad:linear-gradient(135deg,#4f46e5 0%,#7c3aed 100%);
  --radius:16px;
  --shadow:0 6px 24px rgba(79,70,229,.10);
  --shadow-2:0 12px 36px rgba(15,23,42,.12);
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.75;font-size:16px;-webkit-text-size-adjust:100%}
a{color:var(--primary);text-decoration:none;transition:.2s}
img{max-width:100%;height:auto;display:block}
::selection{background:var(--primary);color:#fff}

/* 公告 */
.alertbar{background:var(--grad);color:#fff;text-align:center;padding:9px 16px;font-size:14px}
.alertbar a{color:#fff;text-decoration:underline}

/* 导航 */
.navbar{position:sticky;top:0;background:rgba(255,255,255,.85);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--line);z-index:50}
.nav-inner{max-width:1120px;margin:0 auto;padding:0 20px;height:64px;display:flex;align-items:center;justify-content:space-between}
.brand{font-size:22px;font-weight:800;letter-spacing:.5px;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.nav-toggle{display:none;font-size:24px;background:none;border:none;cursor:pointer;color:var(--ink)}
.nav-links{display:flex;gap:30px}
.nav-links a{color:var(--ink-2);font-weight:500;position:relative;padding:4px 0;letter-spacing:.3px}
.nav-links a:hover{color:var(--primary)}
.nav-links a.active{color:var(--primary);font-weight:600}
.nav-links a.active::after{content:"";position:absolute;left:0;right:0;bottom:-6px;height:2.5px;background:var(--grad);border-radius:2px}
@media(max-width:720px){
  .nav-toggle{display:block}
  .nav-links{display:none;position:absolute;top:64px;left:0;right:0;background:#fff;flex-direction:column;padding:12px 20px 16px;border-bottom:1px solid var(--line);box-shadow:0 10px 24px rgba(0,0,0,.08)}
  .nav-links.open{display:flex}
  .nav-links a{font-size:16px;padding:12px 4px;border-bottom:1px dashed var(--line)}
  .nav-links a:last-child{border-bottom:none}
}

/* 容器 */
.wrap{max-width:1120px;margin:0 auto;padding:40px 20px}
section.block{padding-top:56px;padding-bottom:56px}

/* Hero */
.hero{background:var(--grad);color:#fff;padding:96px 20px;text-align:center;position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;top:-70px;right:-70px;width:320px;height:320px;background:radial-gradient(circle,rgba(255,255,255,.14),transparent 70%);border-radius:50%}
.hero::after{content:"";position:absolute;bottom:-90px;left:-50px;width:260px;height:260px;background:radial-gradient(circle,rgba(255,255,255,.12),transparent 70%);border-radius:50%}
.hero-badge{display:inline-block;background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.35);padding:5px 18px;border-radius:24px;font-size:13px;letter-spacing:1.5px;margin-bottom:20px}
.hero h1{font-size:clamp(30px,6vw,50px);font-weight:800;letter-spacing:1px;margin-bottom:16px;position:relative;line-height:1.25}
.hero p{font-size:clamp(15.5px,2.6vw,18.5px);opacity:.93;max-width:660px;margin:0 auto 30px;position:relative;line-height:1.8}
.btn{display:inline-block;background:#fff;color:var(--primary-d);font-weight:700;padding:13px 30px;border-radius:32px;box-shadow:0 8px 22px rgba(0,0,0,.16);transition:.2s;position:relative;letter-spacing:.3px}
.btn:hover{transform:translateY(-2px);box-shadow:0 12px 28px rgba(0,0,0,.2)}
.btn.ghost{background:transparent;color:#fff;border:2px solid rgba(255,255,255,.75);margin-left:12px;box-shadow:none}
.btn.ghost:hover{background:rgba(255,255,255,.12)}
@media(max-width:520px){
  .hero{padding:64px 16px}
  .hero .btn{display:block;width:100%;max-width:280px;margin:0 auto}
  .hero .btn.ghost{margin:12px auto 0}
}

/* 区块标题 */
.sec-title{text-align:center;margin-bottom:40px}
.sec-title .tag{display:inline-block;color:var(--primary);background:var(--primary-l);padding:4px 16px;border-radius:24px;font-size:13px;font-weight:600;letter-spacing:.5px;margin-bottom:12px}
.sec-title h2{font-size:clamp(26px,4vw,34px);font-weight:800;letter-spacing:.5px}

/* 关于 */
.about-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:44px;align-items:center}
.about-text h3{font-size:28px;font-weight:800;margin-bottom:16px;letter-spacing:.5px}
.about-text > p{color:var(--ink-2);margin-bottom:22px;line-height:1.85}
.about-stats{display:flex;gap:16px;flex-wrap:wrap}
.stat{flex:1;min-width:120px;background:var(--bg-2);border:1px solid var(--line);border-radius:var(--radius);padding:22px;text-align:center}
.stat b{display:block;font-size:30px;color:var(--primary);font-weight:800}
.stat span{display:block;color:var(--ink-2);font-size:14px;margin-top:2px}
@media(max-width:720px){.about-grid{grid-template-columns:1fr;gap:24px}}

/* 服务卡片 */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px 26px;box-shadow:var(--shadow);transition:.25s}
.card:hover{transform:translateY(-5px);box-shadow:var(--shadow-2)}
.card .ico{font-size:38px;margin-bottom:14px}
.card h3{margin-bottom:10px;font-size:19px;font-weight:700}
.card p{color:var(--ink-2);font-size:14.5px;line-height:1.75}
@media(max-width:860px){.cards{grid-template-columns:1fr}}
@media(max-width:520px){.cards{grid-template-columns:1fr;gap:16px}}

/* 论坛卡片 */
.post-grid{display:flex;flex-wrap:wrap;gap:24px;justify-content:center;align-items:stretch}
.post-grid > .post-card{flex:1 1 300px;max-width:calc((100% - 48px)/3)}
.post-grid > .empty{flex:1 1 100%}
.post-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:.25s;display:flex;flex-direction:column}
.post-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-2)}
.post-card .ph{height:160px;background:var(--grad);display:flex;align-items:center;justify-content:center;color:#fff;font-size:40px}
.post-card .ph img{width:100%;height:100%;object-fit:cover}
.post-body{padding:20px;display:flex;flex-direction:column;flex:1}
.post-meta{font-size:12.5px;color:var(--ink-3);margin-bottom:10px;display:flex;gap:12px;flex-wrap:wrap}
.post-body h3{font-size:17.5px;line-height:1.45;margin-bottom:8px;font-weight:700}
.post-body h3 a{color:var(--ink)}
.post-body h3 a:hover{color:var(--primary)}
.post-body p{font-size:14px;color:var(--ink-2);flex:1}
.post-link{margin-top:14px;font-size:14px;font-weight:600;display:inline-block}
.post-link:hover{color:var(--primary-d)}
@media(max-width:900px){.post-grid > .post-card{max-width:calc((100% - 24px)/2)}}
@media(max-width:600px){.post-grid{gap:16px}.post-grid > .post-card{max-width:100%}}
.pager{display:flex;justify-content:center;gap:8px;margin-top:30px}
.pager a,.pager span{background:#fff;border:1px solid var(--line);padding:7px 16px;border-radius:10px;color:var(--ink-2)}
.pager a:hover{background:var(--primary);color:#fff;border-color:var(--primary)}

/* 文章详情 */
.article{max-width:760px;margin:0 auto}
.article h1{font-size:clamp(26px,4.5vw,36px);line-height:1.4;margin-bottom:12px;font-weight:800;letter-spacing:.5px}
.article .meta{color:var(--ink-3);font-size:14px;margin-bottom:22px;display:flex;gap:16px;flex-wrap:wrap}
.article .cover{border-radius:var(--radius);margin-bottom:24px;width:100%;max-height:400px;object-fit:cover}
.article-body{font-size:16.5px;color:var(--ink);line-height:1.9;word-break:break-word;overflow-wrap:break-word}
.article-body h2{font-size:24px;margin:32px 0 14px;font-weight:800}
.article-body h3{font-size:20px;margin:26px 0 12px;font-weight:700}
.article-body p{margin-bottom:18px}
.article-body img{border-radius:12px;margin:16px auto;height:auto;max-width:100%}
.article-body p:empty{display:none}
.article-body > :first-child{margin-top:0}
.article-body a{text-decoration:underline}
.article-body pre{background:#0f172a;color:#e2e8f0;padding:18px;border-radius:12px;overflow:auto;font-size:14px;margin-bottom:18px;line-height:1.6}
.article-body code{background:var(--bg-2);padding:2px 7px;border-radius:6px;font-size:.9em;font-family:ui-monospace,"SFMono-Regular",Consolas,monospace}
.article-body pre code{background:none;padding:0}

/* 联系 */
.contact{max-width:640px;margin:0 auto}
.contact-grid{display:grid;gap:16px;margin-bottom:26px}
.c-item{display:flex;gap:16px;align-items:center;background:var(--bg-2);border:1px solid var(--line);padding:20px 22px;border-radius:var(--radius);transition:.2s}
.c-item:hover{border-color:var(--primary)}
.c-item .ico{font-size:30px}
.c-item b{display:block;color:var(--ink-3);font-size:13px;font-weight:500}
.c-item span{font-size:16px;color:var(--ink)}

/* 空状态 */
.empty{text-align:center;color:var(--ink-3);padding:60px 0}

/* 页脚 */
.footer{text-align:center;padding:34px 20px;background:#0f172a;color:#94a3b8;font-size:14px;letter-spacing:.3px}

/* ===== 手机端细节优化 ===== */
body{padding-bottom:env(safe-area-inset-bottom)}
@media (max-width:640px){
  .hero-badge{font-size:12px;padding:4px 12px}
  .wrap{padding:26px 16px}
  section.block{padding-top:40px;padding-bottom:40px}
  .article-body{font-size:16px;line-height:1.9;letter-spacing:.2px}
  .article-body p{margin-bottom:16px}
  .article-body h2,.article-body h3{margin:22px 0 12px}
  .post-card .ph{height:150px}
  .post-body{padding:16px}
  .post-body h3{font-size:16px}
  .about-stats{gap:10px}
  .stat{padding:16px 10px}
  .stat b{font-size:24px}
  .sec-title h2{font-size:24px}
  .contact,.article{width:100%}
}
@media (max-width:380px){
  .nav-links a{font-size:15px}
  .brand{font-size:19px}
}

/* ===== 字体优化 ===== */
body{font-family:-apple-system,BlinkMacSystemFont,"HarmonyOS Sans SC","HarmonyOS Sans","PingFang SC","Noto Sans SC","Microsoft YaHei",sans-serif;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
h1,h2,h3{letter-spacing:.5px}
.hero h1{letter-spacing:1px;font-weight:800}
.article-body p{letter-spacing:.2px}

/* ===== 动效 ===== */
@keyframes fadeUp{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:none}}
/* 滚动进入视口时淡入上浮 */
.js .reveal{opacity:0;transform:translateY(26px);transition:opacity .7s cubic-bezier(.22,.61,.36,1),transform .7s cubic-bezier(.22,.61,.36,1)}
.js .reveal.show{opacity:1;transform:none}
/* Hero 入场动画 */
.hero-inner>*{animation:fadeUp .9s ease both}
.hero-inner>*:nth-child(1){animation-delay:.05s}
.hero-inner>*:nth-child(2){animation-delay:.18s}
.hero-inner>*:nth-child(3){animation-delay:.32s}
.hero-inner>*:nth-child(4){animation-delay:.46s}
.hero-inner>*:nth-child(5){animation-delay:.6s}
.alertbar{animation:fadeUp .6s ease both}
/* 卡片悬停上浮 */
.card,.post-card{transition:transform .3s ease,box-shadow .3s ease}
.card:hover,.post-card:hover{transform:translateY(-7px);box-shadow:0 16px 34px rgba(79,70,229,.14)}
/* 尊重系统减弱动效偏好 */
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}.js .reveal{opacity:1;transform:none}}

/* ===== 用户系统 / 互动 UI ===== */
.nav-user{display:flex;align-items:center;gap:8px;position:relative;margin-left:4px}
.nav-auth-btn{border:1px solid var(--line);background:var(--bg-2);color:var(--ink-2);padding:6px 14px;border-radius:20px;font-size:13px;cursor:pointer;transition:.2s}
.nav-auth-btn:hover{border-color:var(--primary);color:var(--primary)}
.nav-auth-btn.solid{background:var(--grad);color:#fff;border:none}
.nav-auth-btn.solid:hover{opacity:.9;color:#fff}
.nav-me{cursor:pointer;font-weight:600;color:var(--ink);display:flex;align-items:center;gap:6px;padding:4px 8px;border-radius:20px;font-size:14px}
.nav-me:hover{background:var(--bg-2)}
.nav-ava{width:26px;height:26px;border-radius:50%;background:var(--grad);color:#fff;display:inline-flex;align-items:center;justify-content:center;font-size:13px;object-fit:cover;overflow:hidden}
.nav-ava img{width:100%;height:100%;object-fit:cover}
.nav-menu{position:absolute;top:100%;right:0;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow-2);min-width:140px;overflow:hidden;z-index:60;margin-top:6px}
.nav-menu a{display:block;padding:11px 16px;color:var(--ink);font-size:14px;border:none!important}
.nav-menu a:hover{background:var(--bg-2)}
@media(max-width:720px){.nav-user{padding:6px 0;border-top:1px solid var(--line);margin-top:6px}}

/* 弹窗 */
.modal-mask{position:fixed;inset:0;background:rgba(15,23,42,.5);backdrop-filter:blur(3px);-webkit-backdrop-filter:blur(3px);z-index:200;display:flex;align-items:center;justify-content:center;padding:20px}
.modal{background:#fff;border-radius:18px;width:100%;max-width:380px;overflow:hidden;box-shadow:0 24px 60px rgba(0,0,0,.25);animation:fadeUp .3s ease}
.modal-tabs{display:flex;border-bottom:1px solid var(--line)}
.modal-tabs button{flex:1;padding:14px;border:none;background:none;font-size:15px;font-weight:600;color:var(--ink-3);cursor:pointer}
.modal-tabs button.on{color:var(--primary);border-bottom:2px solid var(--primary)}
.modal-close{flex:0 0 auto!important;max-width:44px;color:var(--ink-3)!important;font-size:18px!important}
.modal-body{padding:22px}
.field{display:flex;flex-direction:column;gap:6px;margin-bottom:14px}
.field label{font-size:13px;color:var(--ink-2);font-weight:500}
.field input,.field select,.field textarea{padding:11px 13px;border:1px solid var(--line);border-radius:10px;font-size:14px;outline:none;font-family:inherit;background:#fff}
.field input:focus,.field textarea:focus,.field select:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(79,70,229,.12)}
.field textarea{resize:vertical;line-height:1.6}
.auth-msg{color:#dc2626;font-size:13px;margin-top:12px;min-height:18px;text-align:center}

/* 交互区 */
.interact{display:flex;gap:10px;flex-wrap:wrap;margin:28px 0 6px}
.ibtn{border:1px solid var(--line);background:var(--bg-2);color:var(--ink-2);padding:9px 18px;border-radius:26px;font-size:14px;cursor:pointer;transition:.2s}
.ibtn:hover{border-color:var(--primary);color:var(--primary)}

/* 评论 */
.comments{margin-top:34px;border-top:1px solid var(--line);padding-top:22px}
.c-title{font-size:19px;margin-bottom:16px;font-weight:700}
.c-login{background:var(--bg-2);border:1px dashed var(--line);border-radius:12px;padding:20px;text-align:center;color:var(--ink-2);display:flex;align-items:center;justify-content:center;gap:12px;flex-wrap:wrap}
.c-write{display:flex;flex-direction:column;gap:10px;margin-bottom:20px}
.c-write textarea{width:100%;padding:12px;border:1px solid var(--line);border-radius:12px;font-family:inherit;font-size:14px;line-height:1.6;resize:vertical}
.c-write textarea:focus{border-color:var(--primary)}
.c-write .btn{align-self:flex-end}
.c-item2{display:flex;gap:12px;padding:16px 0;border-bottom:1px dashed var(--line)}
.c-ava{width:38px;height:38px;border-radius:50%;background:var(--bg-2);flex-shrink:0;display:flex;align-items:center;justify-content:center;font-size:20px;overflow:hidden}
.c-ava img{width:100%;height:100%;object-fit:cover}
.c-main{flex:1}
.c-head{display:flex;gap:10px;align-items:center;font-size:13px;color:var(--ink-3);margin-bottom:4px}
.c-head b{color:var(--ink)}
.c-del{margin-left:auto;color:#dc2626;font-size:12px;cursor:pointer}
.c-text{font-size:14.5px;line-height:1.7;color:var(--ink)}

/* 卡片底部统计 */
.post-foot{display:flex;gap:14px;color:var(--ink-3);font-size:12.5px;margin-top:12px}

/* 富文本工具栏 */
.tb{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:8px}
.tb button{border:1px solid var(--line);background:var(--bg-2);padding:6px 12px;border-radius:8px;font-size:13px;cursor:pointer}
.tb button:hover{border-color:var(--primary);color:var(--primary)}

/* 轻提示 */
#toast{position:fixed;left:50%;bottom:80px;transform:translateX(-50%) translateY(20px);background:rgba(15,23,42,.92);color:#fff;padding:11px 22px;border-radius:24px;font-size:14px;opacity:0;pointer-events:none;transition:.3s;z-index:300;white-space:nowrap;max-width:86vw}
#toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* 列表/文章作者小头像 */
/* 列表/文章作者小头像 */
.mini-ava{width:20px;height:20px;border-radius:50%;object-fit:cover;vertical-align:-4px;margin-right:4px;background:var(--bg-2)}

/* 服务卡片可作链接跳转 */
.card.service-link{display:block;text-decoration:none;color:inherit}

/* ===== 正文排版与图片显示优化 ===== */
.article-body p{line-height:1.9}
.article-body img{vertical-align:middle}
@media(max-width:640px){
  .article-body{font-size:16px;line-height:1.85}
  .article-body img{margin:12px auto;border-radius:10px}
}

/* ===== 图片框选显示区域（imgcrop 容器） ===== */
.article-body .imgcrop{display:block;margin:14px auto;overflow:hidden;border-radius:10px;background:var(--bg-2,#f1f5f9)}
.article-body .imgcrop img{display:block;margin:0;max-width:none;border-radius:0}

/* ===== 文字头像回退（图片加载失败时） ===== */
.c-ava b{width:100%;height:100%;display:flex;align-items:center;justify-content:center;background:var(--grad);color:#fff;font-size:16px}
b.mini-ava{display:inline-flex;align-items:center;justify-content:center;background:var(--grad);color:#fff;font-size:12px}
b.nav-ava{font-size:13px}

/* ===== 图片灯箱 ===== */
.article-body img{cursor:zoom-in}
#lbBox{position:fixed;inset:0;z-index:200;background:rgba(9,13,25,.92);display:none;align-items:center;justify-content:center;padding:24px;cursor:zoom-out}
#lbBox.show{display:flex;animation:lbIn .22s ease}
#lbBox img{max-width:94vw;max-height:88vh;border-radius:10px;box-shadow:0 24px 60px rgba(0,0,0,.5);background:#fff}
#lbBox .lb-close{position:absolute;top:18px;right:22px;color:#fff;font-size:22px;line-height:1;opacity:.85}
@keyframes lbIn{from{opacity:0}to{opacity:1}}
@media(max-width:640px){#lbBox{padding:12px}#lbBox img{max-width:96vw;max-height:82vh}}

/* ===== 公告链接 / 关闭 ===== */
.alertbar{position:relative;padding-right:44px}
.alertbar .ann-link{color:#fff;text-decoration:underline;white-space:nowrap}
.alertbar .ann-close{position:absolute;right:16px;top:50%;transform:translateY(-50%);cursor:pointer;font-size:13px;opacity:.75;line-height:1;padding:4px 6px;border-radius:6px}
.alertbar .ann-close:hover{opacity:1;background:rgba(255,255,255,.18)}
@media(max-width:640px){.alertbar{padding-right:38px;font-size:13px}}

/* ================= 排版增强 ================= */
h1,h2,h3,.sec-title h2,.article h1{text-wrap:balance}
p,.post-body p,.article-body p{text-wrap:pretty}
.article-body{text-align:justify;text-justify:inter-ideograph}
.article-body p{margin-bottom:1.05em}
.article-body ul,.article-body ol{margin:0 0 18px;padding-left:1.5em}
.article-body li{margin-bottom:7px;line-height:1.85}
.article-body li::marker{color:var(--primary)}
.article-body blockquote{margin:20px 0;padding:14px 18px;background:var(--bg-2);border-left:4px solid var(--primary);border-radius:0 12px 12px 0;color:var(--ink-2)}
.article-body blockquote p:last-child{margin-bottom:0}
.article-body table{width:100%;border-collapse:collapse;margin:0 0 18px;font-size:15px}
.article-body th,.article-body td{border:1px solid var(--line);padding:9px 12px;text-align:left}
.article-body th{background:var(--bg-2);font-weight:700}
.article-body hr{border:none;border-top:1px dashed var(--line);margin:26px 0}
.article-body a{text-decoration-thickness:1px;text-underline-offset:3px}
.stat b,.post-foot,.article .meta,.post-meta,.c-head span{font-variant-numeric:tabular-nums}
h1,h2,h3{scroll-margin-top:84px}
html{-webkit-tap-highlight-color:transparent}
:focus-visible{outline:2px solid var(--primary);outline-offset:2px;border-radius:6px}

/* 滚动条 */
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:#cbd5e1;border-radius:20px;border:2px solid transparent;background-clip:content-box}
::-webkit-scrollbar-thumb:hover{background:#94a3b8;background-clip:content-box}

/* ================= 动效 ================= */
#view.enter{animation:viewIn .38s cubic-bezier(.22,.61,.36,1) both}
@keyframes viewIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
img.imgfade{opacity:0;transition:opacity .45s ease}
img.imgfade.loaded{opacity:1}
.post-card .ph.shimmer{background:linear-gradient(100deg,#eef2f8 30%,#f8fafc 50%,#eef2f8 70%);background-size:200% 100%;animation:shim 1.3s linear infinite}
@keyframes shim{to{background-position:-200% 0}}
#backTop{position:fixed;right:22px;bottom:26px;width:44px;height:44px;border-radius:50%;background:var(--grad);color:#fff;border:none;cursor:pointer;
  display:flex;align-items:center;justify-content:center;font-size:17px;box-shadow:0 10px 24px rgba(79,70,229,.35);
  opacity:0;visibility:hidden;transform:translateY(12px);transition:.28s;z-index:60}
#backTop.show{opacity:1;visibility:visible;transform:none}
#backTop:hover{transform:translateY(-3px)}
.navbar{transition:box-shadow .25s ease}
.navbar.scrolled{box-shadow:0 6px 22px rgba(15,23,42,.10)}
.btn{transition:transform .18s ease,box-shadow .18s ease,background .18s ease,color .18s ease}
.btn:active{transform:scale(.97) translateY(0)}
.ibtn{transition:background .18s ease,transform .18s ease}
.ibtn:active{transform:scale(.97)}
@media(max-width:640px){#backTop{right:14px;bottom:18px;width:40px;height:40px}}

/* ================= 暗色模式 ================= */
@media (prefers-color-scheme: dark){
  :root{
    --ink:#e6ebf5; --ink-2:#a8b3c7; --ink-3:#8b98ab;
    --bg:#0f1420; --bg-2:#161d2e; --line:#25304a; --primary-l:#1e2540;
    --shadow:0 6px 24px rgba(0,0,0,.35); --shadow-2:0 12px 36px rgba(0,0,0,.5);
  }
  body{background:var(--bg);color:var(--ink)}
  .navbar{background:rgba(15,20,32,.86)}
  .card,.post-card,.stat,.c-item,.ie-preview,.pager a,.pager span{background:#161d2e;color:var(--ink)}
  .post-card .ph{background:#1b2336}
  .post-card .ph.shimmer{background:linear-gradient(100deg,#1b2336 30%,#232d44 50%,#1b2336 70%);background-size:200% 100%}
  .btn{background:var(--bg-2);color:var(--ink)}
  .btn.ghost{border-color:rgba(255,255,255,.5)}
  .hero .btn{background:#fff;color:var(--primary-d)}
  .footer{background:#080c14;color:#8b98ab}
  .article-body pre{background:#0a0f1a}
  .article-body code{background:#1e2739}
  #lbBox{background:rgba(0,0,0,.95)}
  #lbBox img{background:#161d2e}
  .c-write textarea{background:#161d2e;color:var(--ink);border-color:var(--line)}
  ::-webkit-scrollbar-thumb{background:#2b3752;background-clip:content-box}
}

/* 暗色：logo 反白 + 编辑器预览可读性 */
@media (prefers-color-scheme: dark){
  .brand img{filter:invert(1) brightness(1.55)}
  .about-right img{filter:invert(1) brightness(1.6)}
  body .ie-preview{background:#161d2e;color:#e6ebf5;border-color:#25304a}
  body .ie-preview .imgcrop{background:#0f1420}
  body .ie-bar{background:#0b1017}
  body .ie-tip{color:#8b98ab}
  body .ie-host.ie-on{outline-color:#6366f1}
}