*{margin:0;padding:0;box-sizing:border-box}
:root{--bg:#ffffff;--bg2:#f8fafc;--bg3:#f1f5f9;--bg4:#e2e8f0;--txt:#0f172a;--txt2:#475569;--txt3:#94a3b8;--indigo:#4f46e5;--indigo2:#6366f1;--indigo-g:rgba(79,70,229,0.08);--orange:#f97316;--orange2:#ea580c;--orange-g:rgba(249,115,22,0.08);--green:#16a34a;--green-g:rgba(22,163,74,0.08);--blue:#2563eb;--blue-g:rgba(37,99,235,0.08);--amber:#d97706;--amber-g:rgba(217,119,6,0.08);--border:#e2e8f0;--border2:#cbd5e1;--shadow:0 1px 3px rgba(0,0,0,0.06),0 1px 2px rgba(0,0,0,0.04);--shadow-lg:0 10px 40px rgba(0,0,0,0.08);--r:12px;--r2:8px;--grad:linear-gradient(135deg,#4f46e5,#7c3aed);--maxw:1200px;--font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif}
html{scroll-behavior:smooth}body{font-family:var(--font);background:var(--bg);color:var(--txt);line-height:1.8;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}img{max-width:100%;height:auto;display:block}

/* NAV */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(255,255,255,0.92);backdrop-filter:blur(20px);border-bottom:1px solid var(--border);height:60px}
.nav-inner{max-width:var(--maxw);margin:0 auto;padding:0 24px;height:100%;display:flex;align-items:center;justify-content:space-between}
.nav-logo{display:flex;align-items:center;gap:10px;font-size:17px;font-weight:800}
.nav-logo-icon{width:34px;height:34px;background:var(--grad);border-radius:10px;display:flex;align-items:center;justify-content:center}
.nav-logo-icon span{color:#fff;font-size:16px;font-weight:800}
.nav-links{display:flex;gap:2px;list-style:none;align-items:center}
.nav-links a{padding:8px 14px;border-radius:8px;font-size:13px;font-weight:500;color:var(--txt2);transition:all .15s}
.nav-links a:hover{color:var(--indigo);background:var(--indigo-g)}
.nav-search{width:180px}
.nav-search .pagefind-ui__search-input{height:32px;font-size:13px;border-radius:8px;border:1px solid var(--border);padding:0 10px;width:100%}
.nav-search .pagefind-ui__drawer{position:absolute;top:44px;z-index:200;background:#fff;border:1px solid var(--border);border-radius:10px;box-shadow:var(--shadow-lg);width:340px}
.nav-dl{padding:8px 20px;background:var(--orange);color:#fff;border-radius:8px;font-size:13px;font-weight:600;white-space:nowrap;transition:all .15s}
.nav-dl:hover{background:var(--orange2);transform:translateY(-1px)}

/* HERO */
.hero{padding:120px 24px 60px;text-align:center;background:linear-gradient(180deg,#f0f0ff 0%,#fff 100%)}
.hero-badge{display:inline-flex;align-items:center;gap:6px;padding:6px 16px;background:var(--indigo-g);border:1px solid rgba(79,70,229,0.15);border-radius:20px;font-size:12px;font-weight:600;color:var(--indigo);margin-bottom:20px}
.hero h1{font-size:clamp(26px,5vw,42px);font-weight:800;line-height:1.3;max-width:800px;margin:0 auto 16px}
.hero h1 em{font-style:normal;color:var(--indigo)}
.hero-sub{font-size:16px;color:var(--txt2);max-width:640px;margin:0 auto 32px;line-height:1.8}
.hero-btns{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.btn-primary{padding:14px 32px;background:var(--orange);color:#fff;border-radius:10px;font-size:15px;font-weight:600;transition:all .15s;display:inline-flex;align-items:center;gap:8px}
.btn-primary:hover{background:var(--orange2);transform:translateY(-2px);box-shadow:0 8px 25px rgba(249,115,22,0.3)}
.btn-secondary{padding:14px 32px;background:var(--bg);border:1px solid var(--border2);color:var(--txt);border-radius:10px;font-size:15px;font-weight:600;transition:all .15s}
.btn-secondary:hover{border-color:var(--indigo);color:var(--indigo)}
.hero-features{display:flex;gap:24px;justify-content:center;margin-top:32px;flex-wrap:wrap}
.hero-feat{display:flex;align-items:center;gap:6px;font-size:13px;color:var(--txt2)}
.hero-feat b{color:var(--green)}

/* DL BAR */
.dl-bar{max-width:var(--maxw);margin:40px auto;padding:0 24px}
.dl-bar-inner{background:var(--grad);border-radius:16px;padding:24px 32px;display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}
.dl-bar-text{color:#fff}
.dl-bar-text h3{font-size:18px;font-weight:700}
.dl-bar-text p{font-size:13px;opacity:.8;margin-top:2px}
.dl-bar-btn{padding:12px 28px;background:#fff;color:var(--indigo);border-radius:10px;font-weight:700;font-size:14px;white-space:nowrap;transition:all .15s}
.dl-bar-btn:hover{transform:translateY(-2px);box-shadow:0 4px 15px rgba(0,0,0,0.15)}

/* SECTIONS */
.section{max-width:var(--maxw);margin:0 auto;padding:48px 24px}
.section-head{display:flex;align-items:center;gap:12px;margin-bottom:28px}
.section-icon{width:40px;height:40px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:20px}
.section-icon.edit{background:var(--indigo-g);color:var(--indigo)}
.section-icon.convert{background:var(--blue-g);color:var(--blue)}
.section-icon.tool{background:var(--green-g);color:var(--green)}
.section-icon.repair{background:var(--amber-g);color:var(--amber)}
.section-head h2{font-size:22px;font-weight:700}

/* CARDS */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px}
.art-card{background:#fff;border:1px solid var(--border);border-radius:14px;overflow:hidden;transition:all .2s;cursor:pointer}
.art-card:hover{border-color:var(--indigo);transform:translateY(-3px);box-shadow:var(--shadow-lg)}
.art-card-img{height:160px;background-size:cover;background-position:center;position:relative;display:flex;align-items:flex-end}
.art-card-img .card-type{position:absolute;top:10px;left:12px;font-size:10px;font-weight:600;padding:3px 10px;border-radius:6px}
.art-card-top{height:120px;position:relative;display:flex;align-items:center;justify-content:center}
.art-card-top .card-emoji{font-size:36px;opacity:.2}
.art-card-top .card-type{position:absolute;top:10px;left:12px;font-size:10px;font-weight:600;padding:3px 10px;border-radius:6px}
.card-type.edit{color:var(--indigo);background:var(--indigo-g)}
.card-type.convert{color:var(--blue);background:var(--blue-g)}
.card-type.tool{color:var(--green);background:var(--green-g)}
.card-type.repair{color:var(--amber);background:var(--amber-g)}
.art-card-body{padding:16px}
.art-card-body h3{font-size:15px;font-weight:700;line-height:1.4;margin-bottom:6px}
.art-card-body p{font-size:12px;color:var(--txt2);line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.art-card-meta{display:flex;gap:12px;margin-top:10px;font-size:11px;color:var(--txt3)}

/* ARTICLE LAYOUT */
.article-layout{max-width:var(--maxw);margin:0 auto;padding:80px 24px 48px;display:grid;grid-template-columns:1fr 280px;gap:40px}
.breadcrumb{font-size:12px;color:var(--txt3);margin-bottom:16px;display:flex;gap:6px;align-items:center;flex-wrap:wrap}
.breadcrumb a{color:var(--txt3)}
.breadcrumb a:hover{color:var(--indigo)}

.article-main{}
.article-header{margin-bottom:32px}
.article-header h1{font-size:clamp(24px,4vw,32px);font-weight:800;line-height:1.3;margin-bottom:12px}
.article-meta{display:flex;gap:16px;font-size:13px;color:var(--txt3);flex-wrap:wrap}
.article-meta span{display:flex;align-items:center;gap:4px}
.article-cover{border-radius:var(--r);overflow:hidden;margin-bottom:28px;background:var(--bg3)}
.article-cover img{width:100%;height:auto}

.article-body h2{font-size:20px;font-weight:700;margin:32px 0 14px;padding-bottom:8px;border-bottom:2px solid var(--indigo-g)}
.article-body h3{font-size:17px;font-weight:600;margin:24px 0 10px;color:var(--txt)}
.article-body p{margin-bottom:14px;color:var(--txt2);line-height:1.8}
.article-body ul,.article-body ol{margin-bottom:14px;padding-left:24px;color:var(--txt2)}
.article-body li{margin-bottom:6px;line-height:1.7}
.article-body blockquote{border-left:3px solid var(--indigo);background:var(--indigo-g);padding:14px 18px;border-radius:0 var(--r2) var(--r2) 0;margin:18px 0;font-size:14px;color:var(--txt2)}
.article-body table{width:100%;border-collapse:collapse;margin:18px 0;font-size:14px}
.article-body th{background:var(--bg3);padding:10px 14px;text-align:left;font-weight:600;border:1px solid var(--border)}
.article-body td{padding:10px 14px;border:1px solid var(--border)}
.article-body img{border-radius:var(--r2);margin:18px 0;max-width:100%;height:auto}

/* DL CTA inside article */
.article-dl{background:#fff;border:2px solid var(--orange);border-radius:var(--r);padding:20px 24px;display:flex;align-items:center;justify-content:space-between;gap:16px;margin:24px 0;flex-wrap:wrap;box-shadow:0 2px 12px rgba(249,115,22,0.08);transition:all .25s ease}
.article-dl:hover{border-width:3px;border-color:var(--orange2);box-shadow:0 6px 24px rgba(249,115,22,0.18);transform:translateY(-2px)}
.article-dl-text{color:var(--txt)}
.article-dl-text h3{font-size:16px;font-weight:700;color:var(--txt)}
.article-dl-text p{font-size:12px;color:var(--txt2);margin-top:2px}
.article-dl-btn{padding:10px 24px;background:var(--orange);color:#fff;border-radius:8px;font-weight:700;font-size:13px;white-space:nowrap;transition:all .15s}
.article-dl-btn:hover{background:var(--orange2);transform:translateY(-1px);box-shadow:0 4px 12px rgba(249,115,22,0.25)}

/* SIDEBAR */
.sidebar{position:sticky;top:80px}
.sidebar-card{background:var(--bg);border:1px solid var(--border);border-radius:var(--r);padding:20px;margin-bottom:16px}
.sidebar-card h3{font-size:15px;font-weight:700;margin-bottom:12px}
.sidebar-card ul{list-style:none}
.sidebar-card li{margin-bottom:8px}
.sidebar-card a{font-size:13px;color:var(--txt2);display:flex;align-items:center;gap:6px}
.sidebar-card a:hover{color:var(--indigo)}
.sidebar-dl{background:#fff;border:2px solid var(--orange);border-radius:var(--r);padding:20px;text-align:center;color:var(--txt);transition:all .25s ease}
.sidebar-dl:hover{border-width:3px;border-color:var(--orange2);box-shadow:0 6px 24px rgba(249,115,22,0.18);transform:translateY(-2px)}
.sidebar-dl h3{font-size:15px;font-weight:700;margin-bottom:6px;color:var(--txt)}
.sidebar-dl p{font-size:12px;color:var(--txt2);margin-bottom:14px}
.sidebar-dl-btn{display:inline-block;padding:10px 24px;background:var(--orange);color:#fff;border-radius:8px;font-weight:700;font-size:13px;transition:all .15s}
.sidebar-dl-btn:hover{background:var(--orange2)}

/* TOC */
#TableOfContents{background:var(--bg2);border:1px solid var(--border);border-radius:var(--r);padding:16px 20px;margin-bottom:24px}
#TableOfContents ul{list-style:none;padding-left:0}
#TableOfContents li{margin-bottom:4px}
#TableOfContents a{font-size:13px;color:var(--txt2);display:block;padding:3px 0}
#TableOfContents a:hover{color:var(--indigo)}
#TableOfContents ul ul{padding-left:16px;margin-top:4px}

/* FOOTER */
.foot{margin-top:60px;border-top:1px solid var(--border);padding:32px 24px;text-align:center}
.foot-inner{max-width:var(--maxw);margin:0 auto}
.foot-links{display:flex;gap:16px;justify-content:center;margin-bottom:16px;flex-wrap:wrap}
.foot-links a{font-size:13px;color:var(--txt2)}
.foot-links a:hover{color:var(--indigo)}
.foot-copy{font-size:12px;color:var(--txt3)}

/* CALLOUT */
.callout{border-left:3px solid var(--orange);background:var(--orange-g);padding:14px 18px;border-radius:0 var(--r2) var(--r2) 0;margin:18px 0;font-size:14px;color:var(--txt2)}

/* LIST PAGE */
.list-header{margin-bottom:32px}
.list-header h1{font-size:28px;font-weight:800;margin-bottom:8px}
.list-header p{font-size:15px;color:var(--txt2)}

@media(max-width:768px){
  .nav-links{display:none}
  .hero h1{font-size:24px}
  .hero-btns{flex-direction:column;align-items:center}
  .dl-bar-inner{flex-direction:column;text-align:center}
  .cards{grid-template-columns:1fr}
  .article-layout{grid-template-columns:1fr;padding:70px 16px 32px}
  .sidebar{position:static;order:-1}
}