/* ===== Reset & Variables ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#ffffff;--bg-alt:#f8fafc;--bg-card:#ffffff;
  --text:#1e293b;--text-light:#64748b;--text-muted:#94a3b8;
  --primary:#6366f1;--primary-dark:#4f46e5;--primary-light:#818cf8;
  --accent:#8b5cf6;
  --border:#e2e8f0;--shadow:0 4px 20px rgba(99,102,241,0.08);
  --shadow-lg:0 10px 40px rgba(99,102,241,0.12);
  --radius:12px;--radius-sm:8px;
  --nav-height:70px;
  --code-bg:#f1f5f9;
  --transition:all 0.3s cubic-bezier(.4,0,.2,1);
}
[data-theme="dark"]{
  --bg:#0f172a;--bg-alt:#1e293b;--bg-card:#1e293b;
  --text:#f1f5f9;--text-light:#cbd5e1;--text-muted:#94a3b8;
  --primary:#818cf8;--primary-dark:#6366f1;--primary-light:#a5b4fc;
  --accent:#a78bfa;
  --border:#334155;--shadow:0 4px 20px rgba(0,0,0,0.3);
  --shadow-lg:0 10px 40px rgba(0,0,0,0.4);
  --code-bg:#0f172a;
}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  background:var(--bg);color:var(--text);line-height:1.7;overflow-x:hidden;
  transition:background .3s,color .3s;
}
a{color:var(--primary);text-decoration:none;transition:var(--transition)}
a:hover{color:var(--primary-dark)}
img{max-width:100%;display:block}
.container{max-width:1200px;margin:0 auto;padding:0 24px}

/* ===== Navbar ===== */
.navbar{
  position:fixed;top:0;left:0;right:0;height:var(--nav-height);z-index:1000;
  transition:var(--transition);
}
.navbar-solid{background:var(--bg-card);box-shadow:var(--shadow)}
.navbar.scrolled{background:var(--bg-card);box-shadow:var(--shadow);backdrop-filter:blur(12px)}
.nav-container{max-width:1200px;margin:0 auto;padding:0 24px;height:100%;display:flex;align-items:center;justify-content:space-between}
.logo{font-size:1.5rem;font-weight:800;color:var(--text);letter-spacing:-.5px}
.logo span{color:var(--primary)}
.nav-menu{display:flex;gap:8px;list-style:none}
.nav-menu a{
  display:block;padding:8px 16px;border-radius:var(--radius-sm);
  color:var(--text-light);font-weight:500;font-size:.95rem;transition:var(--transition);
}
.nav-menu a:hover,.nav-menu a.active{color:var(--primary);background:var(--bg-alt)}
.nav-actions{display:flex;align-items:center;gap:8px}
.icon-btn{
  width:40px;height:40px;border:none;border-radius:50%;background:transparent;
  font-size:1.2rem;cursor:pointer;display:flex;align-items:center;justify-content:center;
  transition:var(--transition);
}
.icon-btn:hover{background:var(--bg-alt);transform:scale(1.1)}
.hamburger{display:none;background:none;border:none;font-size:1.5rem;cursor:pointer;color:var(--text)}

/* ===== Hero ===== */
.hero{
  position:relative;min-height:100vh;display:flex;align-items:center;justify-content:center;
  overflow:hidden;color:#fff;
}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;transition:opacity 1s ease}
.hero-content{position:relative;z-index:2;text-align:center;padding:0 24px;max-width:800px;text-shadow:0 2px 12px rgba(0,0,0,.6)}
.hero-title{font-size:clamp(2.5rem,6vw,4.5rem);font-weight:800;margin-bottom:20px;letter-spacing:-1px;line-height:1.2}
.cursor{color:#fff;animation:blink 1s infinite}
@keyframes blink{0%,50%{opacity:1}51%,100%{opacity:0}}
.hero-subtitle{font-size:clamp(1rem,2vw,1.3rem);margin-bottom:36px;font-weight:400;min-height:1.8em}
.typed-text{display:inline}
.type-cursor{display:inline-block;margin-left:2px;font-weight:300;animation:typeBlink .8s infinite}
@keyframes typeBlink{0%,50%{opacity:1}51%,100%{opacity:0}}
.hero-actions{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.btn{
  display:inline-block;padding:14px 32px;border-radius:50px;font-weight:600;font-size:1rem;
  cursor:pointer;border:none;transition:var(--transition);text-align:center;
}
.btn-primary{background:#fff;color:var(--primary);box-shadow:0 8px 24px rgba(0,0,0,.15)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 32px rgba(0,0,0,.2);background:#fff;color:var(--primary-dark)}
.btn-outline{background:transparent;color:var(--primary);border:2px solid var(--primary)}
.btn-outline:hover{background:var(--primary);border-color:var(--primary);color:#fff}
.hero .btn-outline{background:transparent;color:#fff;border:2px solid rgba(255,255,255,.6)}
.hero .btn-outline:hover{background:rgba(255,255,255,.15);border-color:#fff;color:#fff}
.btn-full{width:100%}
.bg-switch-btn{
  position:absolute;bottom:80px;right:24px;z-index:3;
  background:rgba(255,255,255,.2);backdrop-filter:blur(10px);
  border:1px solid rgba(255,255,255,.3);color:#fff;
  padding:8px 18px;border-radius:50px;cursor:pointer;font-size:.9rem;
  transition:var(--transition);
}
.bg-switch-btn:hover{background:rgba(255,255,255,.3);transform:scale(1.05)}
.scroll-hint{
  position:absolute;bottom:30px;left:50%;transform:translateX(-50%);z-index:2;
  font-size:1.5rem;animation:bounce 2s infinite;opacity:.8;
}
@keyframes bounce{0%,20%,50%,80%,100%{transform:translateX(-50%) translateY(0)}40%{transform:translateX(-50%) translateY(-10px)}60%{transform:translateX(-50%) translateY(-5px)}}

/* ===== Section ===== */
.section{padding:80px 0}
.section-alt{background:var(--bg-alt)}
.section-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:40px}
.section-header h2{font-size:2rem;font-weight:700;position:relative}
.section-header h2::after{
  content:'';position:absolute;bottom:-8px;left:0;width:50px;height:4px;
  background:linear-gradient(90deg,var(--primary),var(--accent));border-radius:2px;
}
.view-all{font-weight:500;color:var(--primary)}

/* ===== Posts Grid ===== */
.posts-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:28px}
.post-card{
  background:var(--bg-card);border-radius:var(--radius);overflow:hidden;
  box-shadow:var(--shadow);transition:var(--transition);cursor:pointer;
  border:1px solid var(--border);
}
.post-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.post-card-image{
  height:200px;background-size:cover;background-position:center;position:relative;overflow:hidden;
}
.post-card-image::after{
  content:'';position:absolute;inset:0;
  background:linear-gradient(180deg,transparent 40%,rgba(0,0,0,.45) 100%);
}
.post-card-body{padding:24px}
.post-cat-tag{
  display:inline-block;padding:4px 12px;border-radius:50px;font-size:.75rem;font-weight:600;
  background:var(--bg-alt);color:var(--primary);margin-bottom:12px;
}
.post-card h3{font-size:1.2rem;margin-bottom:10px;line-height:1.5;color:var(--text)}
.post-card p{color:var(--text-light);font-size:.9rem;margin-bottom:16px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.post-meta{display:flex;justify-content:space-between;align-items:center;font-size:.8rem;color:var(--text-muted)}
.load-more-wrap{text-align:center;margin-top:36px}
.load-more-wrap .btn{transition:all .3s ease}
.load-more-wrap .btn:hover{transform:translateY(-2px)}
#latestPosts{transition:opacity .3s ease, transform .3s ease}
.post-tags{display:flex;gap:6px;flex-wrap:wrap}
.post-tags span{background:var(--bg-alt);padding:2px 8px;border-radius:4px;font-size:.75rem}

/* ===== Categories ===== */
.categories-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:24px}
.category-card{
  background:var(--bg-card);border-radius:var(--radius);padding:32px 24px;text-align:center;
  transition:var(--transition);border:1px solid var(--border));cursor:pointer;display:block;color:var(--text);
}
.category-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);color:var(--cat-color,var(--primary))}
.cat-icon{font-size:3rem;margin-bottom:16px}
.category-card h3{font-size:1.2rem;margin-bottom:8px;color:var(--cat-color,var(--primary))}
.category-card p{color:var(--text-light);font-size:.9rem}

/* ===== Page Header ===== */
.page-header{
  margin-top:var(--nav-height);padding:60px 0 40px;
  background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;
}
.page-header h1{font-size:2.5rem;margin-bottom:8px}
.page-header p{opacity:.9;font-size:1.1rem}

/* ===== Blog Layout ===== */
.blog-layout{display:grid;grid-template-columns:1fr 300px;gap:40px}
.search-box{position:relative;margin-bottom:24px}
.search-input{
  width:100%;padding:14px 20px 14px 48px;border:2px solid var(--border);border-radius:50px;
  font-size:1rem;background:var(--bg-card);color:var(--text);transition:var(--transition);outline:none;
}
.search-input:focus{border-color:var(--primary);box-shadow:0 0 0 4px rgba(99,102,241,.1)}
.search-icon{position:absolute;left:20px;top:50%;transform:translateY(-50%);font-size:1rem}
.active-filter{
  background:linear-gradient(90deg,var(--primary),var(--accent));color:#fff;
  padding:8px 16px;border-radius:var(--radius-sm);margin-bottom:16px;
  display:inline-flex;align-items:center;gap:8px;font-size:.9rem;
}
.active-filter .clear{cursor:pointer;opacity:.8;margin-left:8px}
.search-results-info{color:var(--text-light);margin-bottom:16px;font-size:.9rem}
.search-results-info strong{color:var(--primary)}
.posts-list .post-card{margin-bottom:20px}
.posts-list .post-card{display:flex;flex-direction:row}
.posts-list .post-card-image{width:260px;min-width:260px;height:auto;min-height:200px}
.posts-list .post-card-body{flex:1}
mark{background:rgba(251,191,36,.3);color:inherit;padding:0 2px;border-radius:2px}

/* ===== Sidebar ===== */
.blog-sidebar{position:sticky;top:calc(var(--nav-height) + 20px);align-self:start}
.widget{background:var(--bg-card);border-radius:var(--radius);padding:24px;margin-bottom:24px;border:1px solid var(--border);box-shadow:var(--shadow)}
.widget h3{font-size:1.1rem;margin-bottom:16px;color:var(--text)}
.cat-list{list-style:none}
.cat-list li{display:flex;justify-content:space-between;padding:8px 0;border-bottom:1px solid var(--border);cursor:pointer;transition:var(--transition)}
.cat-list li:last-child{border-bottom:none}
.cat-list li:hover{color:var(--primary);padding-left:8px}
.cat-list li .count{background:var(--bg-alt);padding:2px 10px;border-radius:50px;font-size:.8rem;color:var(--text-light)}
.tag-cloud{display:flex;gap:8px;flex-wrap:wrap}
.tag-cloud span{
  padding:6px 14px;background:var(--bg-alt);border-radius:50px;font-size:.85rem;
  cursor:pointer;transition:var(--transition);color:var(--text-light);
}
.tag-cloud span:hover{background:var(--primary);color:#fff;transform:scale(1.05)}
.recent-list{list-style:none}
.recent-list li{padding:10px 0;border-bottom:1px solid var(--border))}
.recent-list li:last-child{border-bottom:none}
.recent-list a{color:var(--text);font-size:.9rem;display:block;line-height:1.5}
.recent-list a:hover{color:var(--primary)}
.recent-list .date{font-size:.75rem;color:var(--text-muted);margin-top:4px;display:block}

/* ===== No Results ===== */
.no-results{text-align:center;padding:60px 20px;color:var(--text-light)}

/* ===== Article ===== */
.article-container{max-width:800px;margin:calc(var(--nav-height) + 40px) auto 40px;padding:0 24px}
.article-header{margin-bottom:40px;padding-bottom:24px;border-bottom:1px solid var(--border)}
.article-meta{display:flex;gap:16px;color:var(--text-muted);font-size:.9rem;margin-bottom:16px;flex-wrap:wrap}
.article-meta span{display:flex;align-items:center;gap:4px}
.article-meta .cat-tag{background:var(--primary);color:#fff;padding:2px 12px;border-radius:50px;font-size:.8rem}
.article-header h1{font-size:clamp(1.8rem,4vw,2.5rem);line-height:1.3;margin-bottom:16px}
.article-body{font-size:1.05rem;line-height:1.8;color:var(--text)}
.article-body h1,.article-body h2,.article-body h3,.article-body h4{margin:1.6em 0 .8em;line-height:1.3;color:var(--text)}
.article-body h2{font-size:1.6rem;border-bottom:2px solid var(--primary);padding-bottom:8px}
.article-body h3{font-size:1.3rem;color:var(--primary)}
.article-body p{margin-bottom:1.2em}
.article-body ul,.article-body ol{margin:1em 0 1.2em 1.5em}
.article-body li{margin-bottom:.4em}
.article-body a{color:var(--primary);border-bottom:1px dashed var(--primary)}
.article-body a:hover{border-bottom-style:solid}
.article-body blockquote{
  border-left:4px solid var(--primary);background:var(--bg-alt);
  padding:16px 20px;margin:1.2em 0;border-radius:0 var(--radius-sm) var(--radius-sm) 0;
  color:var(--text-light);font-style:italic;
}
.article-body code{
  background:var(--code-bg);padding:2px 8px;border-radius:4px;
  font-family:"JetBrains Mono","Fira Code",monospace;font-size:.9em;color:var(--primary);
}
.article-body pre{
  background:var(--code-bg);padding:20px;border-radius:var(--radius);
  overflow-x:auto;margin:1.2em 0;border:1px solid var(--border);
}
.article-body pre code{background:none;padding:0;color:inherit;font-size:.88rem}
.article-body img{border-radius:var(--radius);margin:1.2em 0;box-shadow:var(--shadow)}
.article-body table{width:100%;border-collapse:collapse;margin:1.2em 0;border-radius:var(--radius-sm);overflow:hidden}
.article-body th,.article-body td{padding:12px 16px;border:1px solid var(--border);text-align:left}
.article-body th{background:var(--bg-alt);font-weight:600}
.article-body hr{border:none;border-top:2px solid var(--border);margin:2em 0}
.article-tags{margin-top:40px;padding-top:24px;border-top:1px solid var(--border);display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.article-back{display:inline-block;margin-bottom:24px;color:var(--text-light)}
.article-back:hover{color:var(--primary)}
.reading-time{display:inline-block;background:var(--bg-alt);padding:2px 12px;border-radius:50px;font-size:.8rem;color:var(--text-light)}

/* ===== Loading ===== */
.loading-spinner{text-align:center;padding:80px 20px}
.spinner{width:50px;height:50px;border:4px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin 1s linear infinite;margin:0 auto 20px}
@keyframes spin{to{transform:rotate(360deg)}}

/* ===== Comments ===== */
.comment-wrapper{max-width:800px;margin:0 auto}
.comment-wrapper h2{margin-bottom:24px}
.comment-form{background:var(--bg-card);padding:24px;border-radius:var(--radius);margin-bottom:32px;border:1px solid var(--border);box-shadow:var(--shadow)}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:12px}
.form-input{
  width:100%;padding:12px 16px;border:2px solid var(--border);border-radius:var(--radius-sm);
  font-size:.95rem;background:var(--bg);color:var(--text);transition:var(--transition);outline:none;font-family:inherit;
}
.form-input:focus{border-color:var(--primary)}
textarea.form-input{resize:vertical;margin-bottom:12px}
.comment-item{background:var(--bg-card);padding:20px;border-radius:var(--radius);margin-bottom:16px;border:1px solid var(--border)}
.comment-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}
.comment-author{font-weight:600;color:var(--primary)}
.comment-date{font-size:.8rem;color:var(--text-muted)}
.comment-text{color:var(--text-light);line-height:1.7}

/* ===== About ===== */
.about-layout{display:grid;grid-template-columns:320px 1fr;gap:40px}
.about-card{
  background:var(--bg-card);border-radius:var(--radius);padding:40px 32px;text-align:center;
  box-shadow:var(--shadow);border:1px solid var(--border);position:sticky;top:calc(var(--nav-height)+20px);
}
.avatar{
  width:120px;height:120px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--accent));
  display:flex;align-items:center;justify-content:center;font-size:3rem;margin:0 auto 20px;
  box-shadow:0 8px 24px rgba(99,102,241,.2);
}
.bio{color:var(--text-light);margin:16px 0 24px;font-size:.95rem}
.social-links{display:flex;gap:8px;flex-wrap:wrap;justify-content:center}
.social-btn{
  padding:8px 16px;background:var(--bg-alt);border-radius:50px;font-size:.85rem;
  color:var(--text-light);transition:var(--transition);
}
.social-btn:hover{background:var(--primary);color:#fff}
.about-content h3{font-size:1.4rem;margin-bottom:20px}
.skills{margin-bottom:30px}
.skill-item{margin-bottom:16px}
.skill-header{display:flex;justify-content:space-between;margin-bottom:6px;font-size:.9rem;font-weight:500}
.skill-bar{height:8px;background:var(--bg-alt);border-radius:4px;overflow:hidden}
.skill-fill{
  height:100%;background:linear-gradient(90deg,var(--primary),var(--accent));
  border-radius:4px;width:0;transition:width 1.2s ease-out;
}
.timeline{position:relative;padding-left:30px}
.timeline::before{content:'';position:absolute;left:8px;top:0;bottom:0;width:2px;background:var(--border)}
.timeline-item{position:relative;margin-bottom:28px}
.tl-dot{
  position:absolute;left:-30px;top:4px;width:18px;height:18px;border-radius:50%;
  background:var(--primary);border:4px solid var(--bg);box-shadow:0 0 0 2px var(--primary);
}
.tl-date{font-size:.85rem;color:var(--primary);font-weight:600;margin-bottom:4px}
.tl-content h4{font-size:1.05rem;margin-bottom:4px}
.tl-content p{color:var(--text-light);font-size:.9rem}

/* ===== Contact ===== */
.contact-layout{display:grid;grid-template-columns:1fr 1fr;gap:40px}
.contact-info h2{font-size:1.8rem;margin-bottom:16px}
.contact-info>p{color:var(--text-light);margin-bottom:32px}
.contact-items{display:flex;flex-direction:column;gap:20px}
.contact-item{display:flex;gap:16px;align-items:flex-start;padding:20px;background:var(--bg-alt);border-radius:var(--radius)}
.ci-icon{font-size:2rem;flex-shrink:0}
.contact-item h4{margin-bottom:4px}
.contact-item p{color:var(--text-light);font-size:.95rem}
.contact-form{
  background:var(--bg-card);padding:32px;border-radius:var(--radius);
  box-shadow:var(--shadow);border:1px solid var(--border);
}
.contact-form h3{margin-bottom:24px;font-size:1.3rem}
.form-group{margin-bottom:16px}
.form-group label{display:block;margin-bottom:6px;font-weight:500;font-size:.9rem}
.form-success{
  background:#dcfce7;color:#166534;padding:12px 16px;border-radius:var(--radius-sm);
  margin-top:16px;text-align:center;font-weight:500;
}
[data-theme="dark"] .form-success{background:#14532d;color:#86efac}

/* ===== Footer ===== */
.footer{background:var(--bg-alt);padding:60px 0 24px;border-top:1px solid var(--border)}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:40px;margin-bottom:40px}
.footer-grid h4{margin-bottom:16px;font-size:1rem}
.footer-grid a{display:block;color:var(--text-light);padding:4px 0;font-size:.9rem}
.footer-grid a:hover{color:var(--primary);padding-left:4px}
.footer-grid p{color:var(--text-light);font-size:.9rem;margin-top:8px}
.footer-bottom{text-align:center;padding-top:24px;border-top:1px solid var(--border);color:var(--text-muted);font-size:.85rem}

/* ===== Responsive ===== */
@media(max-width:900px){
  .blog-layout{grid-template-columns:1fr}
  .blog-sidebar{position:static}
  .about-layout{grid-template-columns:1fr}
  .about-card{position:static}
  .contact-layout{grid-template-columns:1fr}
  .posts-list .post-card{flex-direction:column}
  .posts-list .post-card-image{width:100%;min-width:auto;height:200px}
  .footer-grid{grid-template-columns:1fr;gap:24px}
}
@media(max-width:768px){
  .nav-menu{
    display:none;position:absolute;top:var(--nav-height);left:0;right:0;
    background:var(--bg-card);flex-direction:column;padding:16px;
    box-shadow:var(--shadow-lg);gap:4px;
  }
  .nav-menu.open{display:flex}
  .nav-menu a{padding:12px 16px}
  .hamburger{display:block}
  .hero-actions{flex-direction:column;align-items:center}
  .btn{width:100%;max-width:280px}
  .section{padding:60px 0}
  .form-row{grid-template-columns:1fr}
  .bg-switch-btn{bottom:24px;right:50%;transform:translateX(50%);font-size:.8rem;padding:6px 14px}
  .bg-switch-btn:hover{transform:translateX(50%) scale(1.05)}
}