/* =========================================================
   alacun.com — SaaS 蓝紫主题 (L0 首页 / L1 分类 / L2 文章)
   白底+蓝紫渐变 #2563EB→#7C3AED，简洁大气 SaaS 质感
   ========================================================= */
:root{--primary:#2563EB;--secondary:#7C3AED;--text:#0F172A;--muted:#64748B;--line:#E5EAF5;--bg:#FFFFFF;--bg2:#F8FAFC;--maxw:1120px}
*{margin:0;padding:0;box-sizing:border-box}
body{background:var(--bg);color:var(--text);font-family:-apple-system,"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;line-height:1.65;font-size:15px}
a{color:inherit;text-decoration:none}
img{max-width:100%}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.grad-text{background:linear-gradient(90deg,var(--primary),var(--secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}

/* ===== 导航 ===== */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;height:64px;gap:36px}
.logo{display:flex;align-items:center;gap:10px;font-size:19px;font-weight:800;letter-spacing:.3px}
.logo .gem{position:relative;width:28px;height:28px;transform:rotate(45deg);border-radius:6px;background:linear-gradient(135deg,var(--primary),var(--secondary));box-shadow:0 4px 12px rgba(37,99,235,.35);flex-shrink:0}
.logo .gem b{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%) rotate(-45deg);color:#fff;font-size:14px;font-weight:800}
.logo .txt{display:flex;flex-direction:column;line-height:1.1}
.logo .txt b{font-size:18px}
.logo .txt span{font-size:10px;color:var(--muted);font-weight:400;letter-spacing:1.5px}
.nav-links{display:flex;gap:30px;font-size:14px;color:var(--muted)}
.nav-links a:hover{color:var(--primary)}
.nav-right{margin-left:auto;display:flex;gap:16px;align-items:center}
.btn{display:inline-block;border-radius:10px;font-weight:600;font-size:14px;padding:10px 26px;border:none;cursor:pointer;transition:.2s;text-align:center}
.btn-pri{background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;box-shadow:0 6px 18px rgba(37,99,235,.25)}
.btn-pri:hover{box-shadow:0 8px 26px rgba(37,99,235,.4);transform:translateY(-1px)}
.btn-out{border:1px solid var(--line);background:#fff;color:var(--text)}
.btn-out:hover{border-color:var(--primary);color:var(--primary)}
.burger{display:none;font-size:22px;background:none;border:none;cursor:pointer;color:var(--text)}
.nav-mobile{display:none;flex-direction:column;background:#fff;border-bottom:1px solid var(--line)}
.nav-mobile a{padding:12px 24px;font-size:14px;color:var(--text);border-bottom:1px solid var(--line)}
.nav-mobile a:last-child{border-bottom:none}
.nav-mobile.show{display:flex !important}

/* ===== Hero（大图+头像） ===== */
.hero{position:relative;overflow:hidden;padding:84px 0 88px;background:linear-gradient(180deg,#F4F6FF,#FFFFFF);border-bottom:1px solid var(--line)}
.hero .wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center;position:relative}
.hero .tag{display:inline-flex;align-items:center;gap:8px;font-size:13px;color:var(--primary);background:rgba(37,99,235,.08);border:1px solid rgba(37,99,235,.22);padding:5px 14px;border-radius:20px;font-weight:600;margin-bottom:18px}
.hero h1{font-size:clamp(2rem,4vw,3rem);font-weight:800;line-height:1.26;letter-spacing:.3px}
.hero .sub{margin-top:18px;color:var(--muted);font-size:clamp(1rem,1.4vw,1.15rem);line-height:1.85;max-width:540px}
.hero .btns{display:flex;gap:14px;margin-top:32px;flex-wrap:wrap}
.hero .btns .btn{padding:14px 34px;font-size:15px}
.hero .avatars{display:flex;align-items:center;margin-top:34px}
.hero .avatars .av{width:42px;height:42px;border-radius:50%;border:2px solid #fff;margin-left:-12px;background:linear-gradient(135deg,var(--primary),var(--secondary));display:flex;align-items:center;justify-content:center;color:#fff;font-size:13px;font-weight:700}
.hero .avatars .av:first-child{margin-left:0}
.hero .avatars .av:nth-child(2){background:linear-gradient(135deg,#f59e0b,#f97316)}
.hero .avatars .av:nth-child(3){background:linear-gradient(135deg,#10b981,#059669)}
.hero .avatars .av:nth-child(4){background:linear-gradient(135deg,#ef4444,#dc2626)}
.hero .avatars .txt{margin-left:16px;font-size:13px;color:var(--muted)}
.hero .avatars .txt b{color:var(--text)}
.imgcard{position:relative;border-radius:20px;overflow:hidden;box-shadow:0 30px 70px rgba(37,99,235,.15)}
.imgcard .im{height:340px;background:linear-gradient(135deg,#E0E7FF,#C7D2FE 45%,#DDD6FE);position:relative;transition:transform .7s}
.imgcard:hover .im{transform:scale(1.04)}
.imgcard .im img{width:100%;height:100%;object-fit:cover;display:block;position:absolute;inset:0}
.imgcard .im::after{content:'';position:absolute;inset:0;background:radial-gradient(400px 200px at 70% 20%,rgba(255,255,255,.5),transparent 60%)}
.imgcard .fl{position:absolute;left:18px;right:18px;bottom:18px;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.6);border-radius:14px;padding:14px 18px;display:flex;align-items:center;gap:12px}
.imgcard .fl .dot{width:40px;height:40px;border-radius:12px;background:linear-gradient(135deg,var(--primary),var(--secondary));display:flex;align-items:center;justify-content:center;color:#fff;font-size:17px;flex-shrink:0}
.imgcard .fl b{display:block;font-size:14px}
.imgcard .fl span{font-size:12px;color:var(--muted)}
.imgcard .fl .arrow{margin-left:auto;color:var(--primary);font-size:18px}

/* ===== 特性区（大图+图标清单） ===== */
.feat-sec{padding:72px 0;border-bottom:1px solid #eef0f5}
.feat-sec.gray{background:linear-gradient(180deg,#fff,#f8fafc)}
.feat-sec .wrap{display:flex;gap:60px;align-items:center}
.feat-sec.rev .wrap{flex-direction:row-reverse}
.feat-sec .imgs{flex:1}
.feat-sec .list{flex:1}
.sec-tag{display:inline-block;font-size:12px;color:var(--primary);background:rgba(37,99,235,.08);border:1px solid rgba(37,99,235,.2);padding:4px 14px;border-radius:6px;font-weight:600;margin-bottom:14px;letter-spacing:1px}
.feat-sec h2{font-size:clamp(1.6rem,2.8vw,2.4rem);font-weight:800;margin-bottom:12px}
.feat-sec h2 .st{color:var(--muted);font-size:clamp(.95rem,1.3vw,1.1rem);font-weight:400;display:block;margin-top:10px}
.fitem{display:flex;align-items:flex-start;gap:16px;margin-top:22px}
.fitem .badge{width:46px;height:46px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:20px;flex-shrink:0;background:rgba(37,99,235,.1);color:var(--primary)}
.fitem:nth-child(odd) .badge{background:rgba(124,58,237,.1);color:var(--secondary)}
.fitem h3{font-size:17px;font-weight:700;margin-bottom:4px}
.fitem p{font-size:14px;color:var(--muted);line-height:1.7}

/* ===== 全宽 CTA ===== */
.cta-sec{background:linear-gradient(120deg,rgba(23,60,150,.68),rgba(88,28,180,.72)),url('/images/dcrrz9c.webp') center/cover no-repeat;color:#fff;position:relative;overflow:hidden}
.cta{text-align:center;padding:72px 24px;position:relative}
.cta h2{font-size:clamp(1.8rem,3vw,2.6rem);font-weight:800;text-shadow:0 2px 14px rgba(0,0,0,.4)}
.cta p{opacity:.95;margin-top:12px;font-size:15px;text-shadow:0 1px 10px rgba(0,0,0,.45)}
.cta .btn{margin-top:32px;background:#fff;color:var(--primary);font-weight:700;padding:16px 48px}
.cta .btn:hover{box-shadow:0 12px 30px rgba(255,255,255,.35)}

/* ===== FAQ ===== */
.faq{padding:72px 0;background:linear-gradient(180deg,#fff,#f8fafc)}
.faq-h{text-align:center;margin-bottom:36px}
.faq-h h2{font-size:clamp(1.6rem,2.8vw,2.4rem);font-weight:800}
.faq-list{max-width:720px;margin:0 auto;display:flex;flex-direction:column;gap:12px}
.faq-it{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px 22px}
.faq-it .q{font-size:15px;font-weight:700;display:flex;justify-content:space-between}
.faq-it .q::after{content:'+';color:var(--primary);font-size:20px}
.faq-it .a{font-size:13px;color:var(--muted);line-height:1.8;margin-top:10px;padding-top:10px;border-top:1px solid #eef0f5}

/* ===== 页脚（深色多栏） ===== */
footer{background:#101826;color:#CBD5E1;padding:44px 0 0}
.foot-main{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr 1fr 1fr;gap:24px;padding-bottom:36px}
.foot-main .about h4{font-size:14px;margin-bottom:16px;color:#fff}
.foot-main .about p{font-size:13px;color:#94A3B8;line-height:1.9}
.foot-main h4{font-size:14px;margin-bottom:16px;color:#fff}
.foot-main a{display:block;font-size:13px;color:#94A3B8;padding:4px 0;transition:.2s}
.foot-main a:hover{color:var(--primary)}
.foot-bar{border-top:1px solid rgba(255,255,255,.1);padding:16px 0;font-size:12px;color:#7C8DB5;display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px}

/* ===== L1 分类页（渐变横幅+大卡列表） ===== */
.cat-hero{background:linear-gradient(120deg,var(--primary),var(--secondary));color:#fff;padding:52px 0 46px}
.cat-hero .crumb{font-size:13px;opacity:.85;margin-bottom:12px}
.cat-hero .crumb a{color:#fff}
.cat-hero h1{font-size:clamp(1.8rem,3vw,2.4rem);font-weight:800}
.cat-hero p{opacity:.9;font-size:14px;margin-top:10px}
.clist{display:grid;grid-template-columns:1fr 1fr;gap:18px;padding:36px 0 8px}
.ci{background:#fff;border:1px solid var(--line);border-radius:16px;padding:24px;display:flex;gap:16px;transition:.25s}
.ci:hover{transform:translateY(-3px);box-shadow:0 16px 40px rgba(37,99,235,.1);border-color:var(--primary)}
.ci .num{font-size:26px;font-weight:800;background:linear-gradient(135deg,var(--primary),var(--secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;min-width:40px;font-family:monospace}
.ci h3{font-size:16px;font-weight:700;margin-bottom:6px}
.ci h3:hover{color:var(--primary)}
.ci .ex{font-size:13px;color:var(--muted);line-height:1.7}
.ci .meta{display:flex;align-items:center;gap:12px;margin-top:12px;font-size:12px;color:var(--muted)}
.pager{display:flex;justify-content:center;gap:8px;padding:30px 0 10px}
.pager a{min-width:38px;height:38px;line-height:38px;text-align:center;background:#fff;border:1px solid var(--line);border-radius:10px;font-size:14px;color:var(--muted);padding:0 12px;transition:.2s}
.pager a:hover{color:var(--primary);border-color:var(--primary)}
.pager a.cur{background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;font-weight:700;border:none}

/* ===== L2 文章页 ===== */
.art-top{background:linear-gradient(180deg,#F4F6FF,#FFFFFF);border-bottom:1px solid var(--line)}
.art-top .wrap{padding:44px 24px 30px;max-width:900px}
.art-top .crumb{font-size:13px;color:var(--muted);margin-bottom:14px}
.art-top .crumb a{color:var(--primary)}
.art-top h1{font-size:clamp(1.6rem,2.6vw,2.2rem);font-weight:800;line-height:1.4}
.art-top .meta{display:flex;flex-wrap:wrap;gap:16px;margin-top:16px;font-size:13px;color:var(--muted)}
.art-top .meta b{color:var(--primary);font-weight:600}
.art-main{padding:36px 0 8px}
.art-main .wrap{max-width:900px}
.art-body{background:#fff;border:1px solid var(--line);border-radius:16px;padding:36px 44px;font-size:16px;line-height:1.95;color:#1E293B}
.art-body h2{font-size:22px;font-weight:800;margin:34px 0 14px;padding-left:14px;border-left:4px solid var(--primary)}
.art-body h3{font-size:18px;font-weight:700;color:var(--text);border-left:3px solid var(--primary);padding-left:10px;margin:26px 0 12px}
.art-body p{margin:14px 0;color:#475569}
.art-body ul,.art-body ol{margin:14px 0;padding-left:26px;color:#475569}
.art-body li{margin:8px 0}
.art-body table{width:100%;border-collapse:collapse;margin:18px 0;font-size:14px}
.art-body th{background:var(--bg2);color:var(--text);font-weight:700;text-align:left}
.art-body th,.art-body td{border:1px solid var(--line);padding:10px 14px}
.art-body blockquote{border-left:3px solid var(--primary);background:#F6F9FF;padding:12px 18px;margin:16px 0;color:var(--muted)}
.art-body img{border-radius:12px;margin:16px 0}
.art-rel{display:grid;grid-template-columns:1fr 1fr 1fr;gap:14px;margin-top:24px}
.art-rel .rc{background:var(--bg2);border:1px solid var(--line);border-radius:12px;padding:18px;transition:.2s}
.art-rel .rc:hover{border-color:var(--primary)}
.art-rel .rc h4{font-size:14px;font-weight:700;line-height:1.6;margin-bottom:8px}
.art-rel .rc h4:hover{color:var(--primary)}
.art-rel .rc time{font-size:12px;color:var(--muted)}
.art-nav{display:flex;justify-content:space-between;gap:20px;margin-top:24px}
.art-nav a{flex:1;background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px 20px;font-size:13px;color:var(--muted);transition:.2s}
.art-nav a:hover{border-color:var(--primary);color:var(--primary)}
.art-nav .dir{display:block;font-size:12px;color:var(--muted);margin-bottom:6px}
.art-back{display:inline-block;margin:24px 0 8px;font-size:13px;color:var(--muted)}
.art-back:hover{color:var(--primary)}

/* ===== 响应式 ===== */
@media (max-width:960px){
  .hero .wrap,.feat-sec .wrap{grid-template-columns:1fr;gap:36px}
  .feat-sec.rev .wrap{flex-direction:column}
  .hero{padding:56px 0}
  .imgcard .im{height:260px}
  .foot-main{grid-template-columns:1fr 1fr}
  .clist{grid-template-columns:1fr}
  .art-rel{grid-template-columns:1fr}
  .nav-links{display:none}
  .burger{display:inline-block}
  .art-body{padding:26px 22px}
}
@media (max-width:560px){
  .foot-main{grid-template-columns:1fr}
  .hero h1{font-size:30px}
  .art-top h1{font-size:24px}
  .art-nav{flex-direction:column}
}

a.imgs{display:block;text-decoration:none;color:inherit}
a.imgs:hover .imgcard{transform:translateY(-2px)}
a.fitem{display:flex;align-items:flex-start;gap:16px;margin-top:22px;text-decoration:none;color:inherit}
a.fitem:hover h3{color:var(--primary)}