@font-face{font-family:'Inter';font-style:normal;font-weight:100 900;font-display:swap;src:url('../fonts/inter-latin-ext.woff2') format('woff2');unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF;}
@font-face{font-family:'Inter';font-style:normal;font-weight:100 900;font-display:swap;src:url('../fonts/inter-latin.woff2') format('woff2');unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;}
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box;}
:root{--blue-500:#3182CE;--blue-600:#2B6CB0;--blue-400:#4299E1;--blue-50:#EBF8FF;--dark:#0F172A;--gray-50:#F7FAFC;--gray-100:#EDF2F7;--gray-200:#E2E8F0;--gray-300:#CBD5E0;--gray-400:#A0AEC0;--gray-500:#718096;--gray-600:#4A5568;--gray-700:#2D3748;--gray-800:#1A202C;--shadow-lg:0px 0px 1px rgba(48,49,51,0.05),0px 8px 16px rgba(48,49,51,0.1);--radius-md:0.375rem;--radius-lg:0.5rem;--radius-xl:0.75rem;--radius-2xl:1rem;--radius-full:9999px;}
html{scroll-behavior:smooth;}
body{font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;color:var(--gray-700);line-height:1.6;background:#fff;-webkit-font-smoothing:antialiased;}
a{text-decoration:none;color:inherit;}
.container{max-width:1200px;margin:0 auto;padding:0 24px;}
.animate-on-scroll{opacity:0;transform:translateY(24px);will-change:opacity,transform;transition:opacity 0.6s cubic-bezier(0.16,1,0.3,1),transform 0.6s cubic-bezier(0.16,1,0.3,1);}
.animate-on-scroll.visible{opacity:1;transform:translateY(0);}
.nav{position:fixed;top:0;left:0;right:0;z-index:1000;background:rgba(15,23,42,0.92);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid rgba(255,255,255,0.06);transition:background 0.3s;}
.nav-inner{max-width:1400px;margin:0 auto;padding:0 24px;display:flex;align-items:center;justify-content:space-between;height:72px;}
.nav-logo{font-size:1.5rem;font-weight:800;color:#fff;letter-spacing:-0.02em;}
.nav-logo span{color:var(--blue-400);}
.nav-links{display:flex;gap:32px;list-style:none;}
.nav-links a{color:var(--gray-300);font-size:0.9rem;font-weight:500;transition:color 0.15s;}
.nav-links a:hover,.nav-links a.active{color:#fff;}
.nav-cta{display:inline-flex;align-items:center;gap:8px;background:var(--blue-600);color:#fff;font-weight:600;font-size:0.9rem;padding:10px 20px;border-radius:var(--radius-lg);border:none;cursor:pointer;transition:all 0.15s;}
.nav-cta:hover{background:#1e4e8c;transform:translateY(-1px);}
.mobile-toggle{display:none;background:none;border:none;cursor:pointer;padding:8px;}
.mobile-toggle span{display:block;width:24px;height:2px;background:#fff;margin:5px 0;transition:0.3s;}
.section{padding:100px 0;content-visibility:auto;contain-intrinsic-size:auto 800px;}
.footer{background:var(--dark);border-top:1px solid rgba(255,255,255,0.06);padding:60px 0 32px;}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:48px;margin-bottom:48px;}
.footer-brand p{font-size:0.9rem;color:var(--gray-400);line-height:1.7;margin-top:16px;}
.footer-col-title{font-size:0.85rem;font-weight:600;color:var(--gray-300);text-transform:uppercase;letter-spacing:0.06em;margin-bottom:16px;}
.footer-col ul{list-style:none;}
.footer-col ul li{margin-bottom:10px;}
.footer-col ul a{font-size:0.9rem;color:var(--gray-400);transition:color 0.15s;}
.footer-col ul a:hover{color:var(--blue-400);}
.footer-bottom{border-top:1px solid rgba(255,255,255,0.06);padding-top:24px;display:flex;justify-content:space-between;align-items:center;}
.footer-bottom p{font-size:0.85rem;color:var(--gray-400);}
.footer-bottom a{color:var(--gray-400);transition:color 0.15s;}
.footer-bottom a:hover{color:var(--blue-400);}
.bw-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;min-height:240px;}
.bw-card{background:#fff;border:1px solid var(--gray-200);border-radius:var(--radius-2xl);overflow:hidden;display:flex;flex-direction:column;text-decoration:none;color:inherit;transition:transform 0.25s cubic-bezier(0.16,1,0.3,1),box-shadow 0.25s,border-color 0.25s;}
.bw-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--blue-400);}
.bw-card-img{height:148px;display:flex;align-items:center;justify-content:center;flex-shrink:0;position:relative;}
.bw-img-ai{background:linear-gradient(135deg,#1e1b4b 0%,#6d28d9 100%);}
.bw-card-body{padding:22px;flex:1;display:flex;flex-direction:column;}
.bw-card-badge{display:inline-block;padding:3px 10px;border-radius:var(--radius-full);font-size:0.7rem;font-weight:700;letter-spacing:0.06em;text-transform:uppercase;margin-bottom:12px;width:fit-content;}
.bw-badge-ai{background:#F5F3FF;color:#6D28D9;}
.bw-card-title{font-size:1rem;font-weight:700;color:var(--gray-800);line-height:1.4;margin-bottom:10px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.bw-card-excerpt{font-size:0.85rem;color:var(--gray-500);line-height:1.65;flex:1;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;margin-bottom:18px;}
.bw-card-footer{display:flex;align-items:center;justify-content:space-between;padding-top:14px;border-top:1px solid var(--gray-100);}
.bw-card-meta{font-size:0.78rem;color:var(--gray-400);}
.bw-card-arrow{color:var(--blue-500);display:flex;transition:transform 0.2s;}
.bw-card:hover .bw-card-arrow{transform:translateX(4px);}
@media (max-width:1024px){.footer-grid{grid-template-columns:1fr 1fr;}
.bw-grid{grid-template-columns:repeat(2,1fr);}
}
@media (max-width:768px){.nav-links{display:none;}
.mobile-toggle{display:block;}
.section{padding:64px 0;}
.footer-grid{grid-template-columns:1fr;gap:32px;}
.footer-bottom{flex-direction:column;gap:12px;text-align:center;}
.bw-grid{grid-template-columns:1fr;}
}
.nav-has-dropdown{position:relative;}
.nav-has-dropdown > a{display:flex;align-items:center;gap:4px;}
.nav-has-dropdown > a .nav-chevron{width:14px;height:14px;transition:transform 0.2s;}
.nav-has-dropdown:hover > a .nav-chevron{transform:rotate(180deg);}
.nav-dropdown{position:absolute;top:calc(100% + 12px);left:50%;transform:translateX(-50%) translateY(-6px);background:rgba(15,23,42,0.98);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid rgba(255,255,255,0.08);border-radius:var(--radius-lg);padding:6px;list-style:none;min-width:220px;opacity:0;visibility:hidden;transition:opacity 0.15s,visibility 0.15s,transform 0.15s;box-shadow:0 8px 24px rgba(0,0,0,0.35);z-index:100;}
.nav-has-dropdown:hover .nav-dropdown{opacity:1;visibility:visible;transform:translateX(-50%) translateY(0);}
.nav-dropdown a{display:block;padding:10px 14px;border-radius:var(--radius-md);font-size:0.88rem;color:var(--gray-300);white-space:nowrap;transition:background 0.15s,color 0.15s;}
.nav-dropdown a:hover{background:rgba(49,130,206,0.12);color:#fff;}
@media (max-width:768px){.nav-has-dropdown > a .nav-chevron{display:none;}
.nav-dropdown{position:static;transform:none;opacity:1;visibility:visible;background:transparent;backdrop-filter:none;box-shadow:none;border:none;border-left:2px solid rgba(49,130,206,0.3);border-radius:0;padding:4px 0 0 12px;min-width:0;}
.nav-dropdown a{font-size:0.85rem;padding:6px 8px;}
}
.nav.mobile-open .nav-links{display:flex;flex-direction:column;position:absolute;top:72px;left:0;right:0;background:var(--dark);padding:24px;gap:16px;border-bottom:1px solid rgba(255,255,255,0.06);}
.bw-article-wrap{padding:120px 0 80px;}
.bw-article-layout{display:grid;grid-template-columns:minmax(0,1fr) 248px;gap:56px;align-items:start;}
.bw-art-breadcrumb{display:flex;align-items:center;gap:6px;flex-wrap:wrap;font-size:0.82rem;color:var(--gray-400);margin-bottom:20px;}
.bw-art-breadcrumb a{color:var(--gray-400);transition:color 0.15s;}
.bw-art-breadcrumb a:hover{color:var(--blue-500);}
.bw-art-breadcrumb .sep{color:var(--gray-300);}
.bw-art-breadcrumb .cur{color:var(--gray-600);}
.bw-article-header{margin-bottom:32px;}
.bw-article-header .bw-card-badge{margin-bottom:16px;display:inline-block;}
.bw-article-header h1{font-size:2.2rem;font-weight:800;line-height:1.25;color:var(--dark);margin-bottom:16px;}
.bw-article-meta{display:flex;align-items:center;gap:10px;flex-wrap:wrap;font-size:0.85rem;color:var(--gray-400);}
.bw-article-meta .sep{color:var(--gray-300);}
.bw-article-divider{border:none;border-top:1px solid var(--gray-200);margin:24px 0 32px;}
.bw-article-body{font-size:1.05rem;line-height:1.85;color:var(--gray-700);}
.bw-article-body h2{font-size:1.5rem;font-weight:700;color:var(--dark);margin:2.5rem 0 0.75rem;line-height:1.3;scroll-margin-top:96px;}
.bw-article-body h3{font-size:1.12rem;font-weight:700;color:var(--gray-800);margin:1.75rem 0 0.5rem;scroll-margin-top:96px;}
.bw-article-body p{margin-bottom:1.25rem;}
.bw-article-body ul{margin:0 0 1.25rem 1.4rem;}
.bw-article-body li{margin-bottom:0.4rem;line-height:1.75;}
.bw-article-body a{color:var(--blue-500);text-decoration:underline;text-underline-offset:3px;}
.bw-article-body a:hover{color:var(--blue-600);}
.bw-article-body strong{color:var(--gray-800);font-weight:600;}
.bw-callout{background:var(--blue-50);border:1px solid #bee3f8;border-radius:var(--radius-xl);padding:18px 22px;margin:1.75rem 0;}
.bw-callout p{margin-bottom:0;color:var(--gray-700);font-size:0.95rem;}
.bw-callout strong{color:var(--blue-600);}
.bw-toc{position:sticky;top:96px;}
.bw-toc-inner{background:var(--gray-50);border:1px solid var(--gray-200);border-radius:var(--radius-2xl);padding:22px 20px;}
.bw-toc-title{font-size:0.72rem;font-weight:700;text-transform:uppercase;letter-spacing:0.07em;color:var(--gray-400);margin-bottom:14px;}
.bw-toc-list{list-style:none;margin:0;padding:0;}
.bw-toc-list li{border-left:2px solid var(--gray-200);padding-left:12px;margin-bottom:4px;transition:border-color 0.15s;}
.bw-toc-list li.toc-active{border-color:var(--blue-500);}
.bw-toc-list a{font-size:0.83rem;color:var(--gray-500);transition:color 0.15s;line-height:1.5;display:block;padding:3px 0;}
.bw-toc-list li.toc-active a{color:var(--blue-600);font-weight:600;}
.bw-toc-list a:hover{color:var(--blue-600);}
.bw-article-footer{border-top:1px solid var(--gray-200);padding-top:28px;margin-top:40px;}
.bw-article-tags{display:flex;align-items:center;gap:8px;flex-wrap:wrap;}
.bw-article-tag-label{font-size:0.82rem;color:var(--gray-400);margin-right:4px;}
.bw-article-tag{background:var(--gray-100);color:var(--gray-600);border-radius:var(--radius-full);padding:4px 12px;font-size:0.8rem;transition:background 0.15s,color 0.15s;}
.bw-article-tag:hover{background:var(--blue-50);color:var(--blue-600);}
.bw-related{background:var(--gray-50);padding:64px 0;}
.bw-related-title{font-size:1.5rem;font-weight:700;color:var(--dark);margin-bottom:32px;}
@media (max-width:1024px){.bw-article-layout{grid-template-columns:1fr;gap:0;}
.bw-toc{position:static;margin-bottom:32px;order:-1;}
.bw-toc-inner{cursor:pointer;}
.bw-toc-title{display:flex;align-items:center;justify-content:space-between;margin-bottom:0;user-select:none;}
.bw-toc-title::after{content:'';display:inline-block;width:8px;height:8px;border-right:2px solid var(--gray-400);border-bottom:2px solid var(--gray-400);transform:rotate(45deg);margin-top:-3px;flex-shrink:0;transition:transform 0.2s,margin-top 0.2s;}
.bw-toc-list{display:none;margin-top:14px;}
}
@media (max-width:768px){.bw-article-body{font-size:1rem;line-height:1.8;}
.bw-article-header h1{font-size:1.65rem;}
.bw-article-body h2{font-size:1.3rem;}
.bw-article-body h3{font-size:1.05rem;}
.bw-article-wrap{padding:96px 0 60px;}
}
.bw-srv{padding:64px 0;background:#fff;border-top:1px solid var(--gray-100);}
.bw-srv-header{margin-bottom:36px;}
.bw-srv-header h2{font-size:1.5rem;font-weight:700;color:var(--dark);margin-bottom:8px;}
.bw-srv-header p{font-size:0.95rem;color:var(--gray-500);max-width:580px;}
.bw-srv-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.bw-srv-card{display:flex;flex-direction:column;gap:14px;padding:24px;border-radius:var(--radius-2xl);border:1px solid var(--gray-200);background:#fff;text-decoration:none;color:inherit;transition:transform 0.2s,box-shadow 0.2s,border-color 0.2s;}
.bw-srv-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);border-color:var(--blue-400);}
.bw-srv-ico{width:44px;height:44px;border-radius:12px;display:flex;align-items:center;justify-content:center;flex-shrink:0;}
.bw-srv-ico-ai{background:#F5F3FF;}
.bw-srv-ico-seo{background:#EFF6FF;}
.bw-srv-ico-ana{background:#F0FDF4;}
.bw-srv-name{font-size:1rem;font-weight:700;color:var(--dark);}
.bw-srv-desc{font-size:0.875rem;color:var(--gray-500);line-height:1.65;flex:1;}
.bw-srv-link{font-size:0.875rem;font-weight:600;color:var(--blue-500);display:flex;align-items:center;gap:5px;padding-top:12px;border-top:1px solid var(--gray-100);margin-top:auto;}
.bw-srv-link svg{transition:transform 0.2s;}
.bw-srv-card:hover .bw-srv-link svg{transform:translateX(3px);}
@media (max-width:900px){.bw-srv-grid{grid-template-columns:1fr 1fr;}
}
@media (max-width:600px){.bw-srv-grid{grid-template-columns:1fr;}
}