@charset "utf-8";

/* ===================== 设计变量（深蓝 + 香槟金 · 与 weixin/ruanwen/guwen/sem 同家族） ===================== */
:root{
  --b2b-navy-0:#070d1f;
  --b2b-navy-1:#0c142c;
  --b2b-navy-2:#16213f;
  --b2b-navy-3:#1d2b50;
  --b2b-gold:#d4af37;
  --b2b-gold-2:#e9cf8e;
  --b2b-gold-grad:linear-gradient(135deg,#e9cf8e 0%,#d4af37 55%,#b8902f 100%);
  --b2b-gold-soft:rgba(212,175,55,.14);
  --b2b-line:rgba(255,255,255,.10);
  --b2b-line-2:rgba(255,255,255,.18);
  --b2b-txt:#eef2fb;
  --b2b-txt-dim:#9fb0d0;
  --b2b-txt-mute:#7e8db0;
  --b2b-radius:22px;
  --b2b-shadow:0 24px 60px rgba(0,0,0,.40);
  --b2b-shadow-soft:0 14px 36px rgba(0,0,0,.28);
  --b2b-serif:"Noto Serif SC","Source Han Serif SC","Songti SC",STSong,serif;
}

/* ===================== 基础 ===================== */
.b2b-page{background:var(--b2b-navy-0);color:var(--b2b-txt);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;line-height:1.6;overflow-x:hidden;}
.b2b-section{padding:clamp(64px,9vh,108px) 0;position:relative;}
.container{padding:0 clamp(18px,4vw,40px);}
.b2b-reveal{opacity:0;transform:translateY(30px);transition:opacity .8s cubic-bezier(.2,.7,.2,1),transform .8s cubic-bezier(.2,.7,.2,1);}
.b2b-reveal.in{opacity:1;transform:none;}

.b2b-head{max-width:760px;margin:0 auto clamp(38px,5vw,60px);text-align:center;}
.b2b-eyebrow{display:inline-block;font-size:13px;letter-spacing:3px;text-transform:uppercase;color:var(--b2b-gold-2);font-weight:600;margin-bottom:14px;position:relative;padding-left:26px;}
.b2b-eyebrow::before{content:"";position:absolute;left:0;top:50%;width:18px;height:1px;background:var(--b2b-gold);}
.b2b-title{font-family:var(--b2b-serif);font-size:clamp(28px,4vw,42px);font-weight:700;line-height:1.25;margin:0 0 16px;color:#fff;}
.b2b-title .b2b-hl{background:var(--b2b-gold-grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;padding:0 2px;}
.b2b-sub{font-size:clamp(14px,1.6vw,16px);color:var(--b2b-txt-dim);margin:0;}

/* 按钮 */
.b2b-btn{display:inline-flex;align-items:center;gap:10px;padding:15px 32px;border-radius:50px;font-size:15px;font-weight:600;text-decoration:none;cursor:pointer;border:1px solid transparent;transition:transform .3s ease,box-shadow .3s ease,background .3s ease,color .3s ease;white-space:nowrap;}
.b2b-btn-gold{background:var(--b2b-gold-grad);color:#3a2c08;box-shadow:0 12px 30px rgba(212,175,55,.35);}
.b2b-btn-gold:hover{transform:translateY(-3px);box-shadow:0 18px 42px rgba(212,175,55,.5);}
.b2b-btn-ghost{background:rgba(255,255,255,.04);color:#fff;border-color:var(--b2b-line-2);backdrop-filter:blur(6px);}
.b2b-btn-ghost:hover{transform:translateY(-3px);background:rgba(255,255,255,.10);border-color:var(--b2b-gold);}

/* 免责声明 */
.b2b-disc{font-size:12.5px;color:var(--b2b-txt-mute);margin-top:22px;line-height:1.7;}
.b2b-disc--left{text-align:left;margin-top:26px;}

/* ===================== HERO（横幅，非全屏） ===================== */
.b2b-hero{position:relative;overflow:hidden;padding:clamp(170px,22vh,260px) 0 clamp(70px,9vh,110px);background:radial-gradient(120% 120% at 78% 0%,#16213f 0%,#0c142c 46%,#070d1f 100%);}
.b2b-hero-aurora{position:absolute;border-radius:50%;filter:blur(70px);opacity:.5;pointer-events:none;}
.b2b-hero-aurora--a{width:520px;height:520px;top:-160px;right:-80px;background:radial-gradient(circle,rgba(212,175,55,.42),transparent 70%);animation:b2bFloat 14s ease-in-out infinite;}
.b2b-hero-aurora--b{width:460px;height:460px;bottom:-180px;left:-100px;background:radial-gradient(circle,rgba(56,103,214,.40),transparent 70%);animation:b2bFloat 18s ease-in-out infinite reverse;}
@keyframes b2bFloat{0%,100%{transform:translateY(0) scale(1);}50%{transform:translateY(-30px) scale(1.06);}}
.b2b-hero-grid{position:absolute;inset:0;background-image:linear-gradient(var(--b2b-line) 1px,transparent 1px),linear-gradient(90deg,var(--b2b-line) 1px,transparent 1px);background-size:54px 54px;mask-image:radial-gradient(circle at 50% 35%,#000 0%,transparent 78%);opacity:.5;}
.b2b-hero .container{position:relative;z-index:2;}
.b2b-hero-inner{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(30px,5vw,64px);align-items:center;}

.b2b-hero-copy{max-width:620px;}
.b2b-badge{display:inline-flex;align-items:center;gap:9px;padding:9px 20px;border-radius:30px;background:var(--b2b-gold-soft);border:1px solid rgba(212,175,55,.32);color:var(--b2b-gold-2);font-size:13.5px;font-weight:600;margin-bottom:24px;}
.b2b-badge-dot{width:8px;height:8px;border-radius:50%;background:var(--b2b-gold);box-shadow:0 0 0 4px rgba(212,175,55,.22);animation:b2bPulse 2s infinite;}
@keyframes b2bPulse{0%,100%{box-shadow:0 0 0 4px rgba(212,175,55,.22);}50%{box-shadow:0 0 0 8px rgba(212,175,55,0);}}
.b2b-hero-title{font-family:var(--b2b-serif);font-size:clamp(34px,5vw,56px);font-weight:700;line-height:1.18;margin:0 0 20px;color:#fff;letter-spacing:-.5px;}
.b2b-hero-title .b2b-hl{background:var(--b2b-gold-grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;}
.b2b-hero-sub{font-size:clamp(15px,1.8vw,18px);color:var(--b2b-gold-2);font-weight:600;margin:0 0 14px;}
.b2b-hero-desc{font-size:15px;color:var(--b2b-txt-dim);line-height:1.9;margin:0 0 30px;}
.b2b-hero-btns{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:34px;}

.b2b-hero-stats{display:flex;flex-wrap:wrap;align-items:center;gap:18px;}
.b2b-stat{text-align:left;}
.b2b-num{font-size:clamp(26px,3vw,34px);font-weight:800;color:var(--b2b-gold);font-family:var(--b2b-serif);line-height:1;}
.b2b-num em{font-style:normal;font-size:.6em;margin-left:2px;color:var(--b2b-gold-2);}
.b2b-lab{font-size:13px;color:var(--b2b-txt-dim);margin-top:6px;}
.b2b-stat-div{width:1px;height:34px;background:var(--b2b-line-2);}
.b2b-hero-trust{margin-top:28px;}
.b2b-hero-trust-lab{font-size:12.5px;color:var(--b2b-txt-mute);letter-spacing:1px;}
.b2b-hero-trust-list{display:flex;flex-wrap:wrap;gap:10px;margin-top:12px;}
.b2b-hero-trust-list span{display:inline-flex;align-items:center;gap:7px;padding:7px 14px;border-radius:30px;background:rgba(255,255,255,.04);border:1px solid var(--b2b-line);font-size:13px;color:var(--b2b-txt-dim);}
.b2b-hero-trust-list i{color:var(--b2b-gold);}

/* HERO 右侧：B2B 店铺运营看板样机 */
.b2b-hero-visual{position:relative;display:flex;flex-direction:column;align-items:center;justify-content:center;}
.b2b-mock-glow{position:absolute;width:340px;height:340px;border-radius:50%;background:radial-gradient(circle,rgba(212,175,55,.30),transparent 65%);filter:blur(40px);top:50%;left:50%;transform:translate(-50%,-50%);}
.b2b-mock-pill{position:absolute;display:inline-flex;align-items:center;gap:8px;padding:10px 16px;border-radius:30px;background:rgba(13,21,44,.82);border:1px solid var(--b2b-line-2);backdrop-filter:blur(8px);font-size:13px;color:var(--b2b-txt);box-shadow:var(--b2b-shadow-soft);z-index:3;animation:b2bFloat 6s ease-in-out infinite;}
.b2b-mock-pill i{color:var(--b2b-gold);}
.b2b-mock-pill--1{top:8%;left:-6%;}
.b2b-mock-pill--2{bottom:10%;right:-4%;animation-delay:1.5s;}
.b2b-mock{position:relative;width:330px;border-radius:38px;padding:14px;background:linear-gradient(160deg,#1b2747,#0d1530);border:1px solid var(--b2b-line-2);box-shadow:var(--b2b-shadow);}
.b2b-mock-top{display:flex;align-items:center;justify-content:space-between;padding:22px 16px 14px;border-radius:26px 26px 0 0;background:linear-gradient(135deg,#16223f,#0f1832);}
.b2b-mock-brand{display:flex;align-items:center;gap:9px;color:#fff;font-weight:600;font-size:15px;}
.b2b-mock-brand i{color:var(--b2b-gold);}
.b2b-mock-live{display:inline-flex;align-items:center;gap:6px;font-size:12px;color:var(--b2b-gold-2);}
.b2b-mock-live i{font-size:8px;color:#4ade80;animation:b2bPulse 2s infinite;}
.b2b-screen{background:#0f1832;border-radius:0 0 26px 26px;padding:16px 14px;min-height:300px;}
.b2b-kpis{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:14px;}
.b2b-kpi{background:rgba(255,255,255,.05);border:1px solid var(--b2b-line);border-radius:14px;padding:12px 8px;text-align:center;}
.b2b-kpi b{display:block;font-family:var(--b2b-serif);font-size:20px;font-weight:800;color:var(--b2b-gold);line-height:1.1;}
.b2b-kpi span{font-size:11px;color:var(--b2b-txt-dim);}
.b2b-board{background:rgba(255,255,255,.03);border:1px solid var(--b2b-line);border-radius:14px;padding:12px;}
.b2b-board-row{display:flex;align-items:center;gap:10px;padding:9px 0;border-bottom:1px dashed var(--b2b-line);}
.b2b-board-row:last-child{border-bottom:none;}
.b2b-board-ic{width:30px;height:30px;border-radius:9px;display:flex;align-items:center;justify-content:center;background:var(--b2b-gold-soft);border:1px solid rgba(212,175,55,.28);color:var(--b2b-gold-2);font-size:13px;flex-shrink:0;}
.b2b-board-txt{flex:1;min-width:0;}
.b2b-board-txt b{display:block;font-size:13px;color:var(--b2b-txt);font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.b2b-board-txt span{font-size:11.5px;color:var(--b2b-txt-dim);}
.b2b-board-tag{font-size:11px;color:var(--b2b-gold-2);background:var(--b2b-gold-soft);border:1px solid rgba(212,175,55,.28);border-radius:20px;padding:4px 10px;white-space:nowrap;}
.b2b-mock-foot{margin-top:14px;text-align:center;font-size:11.5px;color:var(--b2b-txt-mute);}

/* ===================== 服务标签导航 ===================== */
.b2b-tags{padding:40px 0 30px;}
.b2b-tags-row{display:flex;flex-wrap:wrap;justify-content:center;gap:12px;}
.b2b-tag{display:inline-flex;align-items:center;padding:11px 22px;border-radius:30px;background:rgba(255,255,255,.04);border:1px solid var(--b2b-line);color:var(--b2b-txt-dim);font-size:14px;font-weight:600;text-decoration:none;transition:all .3s ease;}
.b2b-tag:hover{color:#fff;border-color:var(--b2b-gold);transform:translateY(-2px);}
.b2b-tag.active{background:var(--b2b-gold-grad);color:#3a2c08;border-color:transparent;box-shadow:0 10px 26px rgba(212,175,55,.34);}

/* ===================== 核心优势 ===================== */
.b2b-adv{background:var(--b2b-navy-1);}
.b2b-adv-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.b2b-adv-card{position:relative;padding:34px 28px;border-radius:var(--b2b-radius);background:linear-gradient(180deg,rgba(255,255,255,.05),rgba(255,255,255,.02));border:1px solid var(--b2b-line);overflow:hidden;transition:transform .4s ease,box-shadow .4s ease,border-color .4s ease;}
.b2b-adv-card::before{content:"";position:absolute;top:0;left:0;width:100%;height:3px;background:var(--b2b-gold-grad);transform:scaleX(0);transform-origin:left;transition:transform .4s ease;}
.b2b-adv-card:hover{transform:translateY(-8px);box-shadow:var(--b2b-shadow);border-color:rgba(212,175,55,.5);}
.b2b-adv-card:hover::before{transform:scaleX(1);}
.b2b-adv-ic{width:58px;height:58px;border-radius:16px;display:flex;align-items:center;justify-content:center;background:var(--b2b-gold-soft);border:1px solid rgba(212,175,55,.28);margin-bottom:20px;transition:transform .4s ease;}
.b2b-adv-ic i{font-size:24px;color:var(--b2b-gold-2);}
.b2b-adv-card:hover .b2b-adv-ic{transform:rotate(-6deg) scale(1.06);}
.b2b-adv-card h3{font-size:19px;font-weight:700;color:#fff;margin:0 0 12px;}
.b2b-adv-card p{font-size:14px;color:var(--b2b-txt-dim);line-height:1.85;margin:0;}

/* ===================== 服务流程 ===================== */
.b2b-flow{background:var(--b2b-navy-0);}
.b2b-flow-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;position:relative;}
.b2b-flow-grid::before{content:"";position:absolute;top:36px;left:12%;right:12%;height:2px;background:linear-gradient(90deg,transparent,var(--b2b-gold),transparent);opacity:.5;}
.b2b-flow-step{position:relative;text-align:center;padding:0 10px;}
.b2b-flow-no{font-family:var(--b2b-serif);font-size:34px;font-weight:800;color:rgba(212,175,55,.22);line-height:1;margin-bottom:10px;}
.b2b-flow-ic{width:64px;height:64px;margin:0 auto 18px;border-radius:18px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#16223f,#0f1832);border:1px solid var(--b2b-line-2);position:relative;z-index:2;transition:transform .4s ease,box-shadow .4s ease;}
.b2b-flow-ic i{font-size:26px;color:var(--b2b-gold-2);}
.b2b-flow-step:hover .b2b-flow-ic{transform:scale(1.12) rotate(5deg);box-shadow:0 14px 34px rgba(212,175,55,.28);}
.b2b-flow-step h3{font-size:17px;font-weight:700;color:#fff;margin:0 0 10px;}
.b2b-flow-step p{font-size:13.5px;color:var(--b2b-txt-dim);line-height:1.8;margin:0;}

/* ===================== 能力矩阵 ===================== */
.b2b-matrix{background:var(--b2b-navy-1);}
.b2b-matrix-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.b2b-matrix-card{padding:30px 26px;border-radius:var(--b2b-radius);background:linear-gradient(180deg,rgba(255,255,255,.04),rgba(255,255,255,.015));border:1px solid var(--b2b-line);transition:transform .4s ease,border-color .4s ease,box-shadow .4s ease;}
.b2b-matrix-card:hover{transform:translateY(-6px);border-color:rgba(212,175,55,.5);box-shadow:var(--b2b-shadow-soft);}
.b2b-matrix-ic{width:54px;height:54px;border-radius:15px;display:flex;align-items:center;justify-content:center;background:var(--b2b-gold-soft);border:1px solid rgba(212,175,55,.28);margin-bottom:18px;}
.b2b-matrix-ic i{font-size:23px;color:var(--b2b-gold-2);}
.b2b-matrix-card h3{font-size:18px;font-weight:700;color:#fff;margin:0 0 10px;}
.b2b-matrix-card p{font-size:14px;color:var(--b2b-txt-dim);line-height:1.8;margin:0;}

/* ===================== 合作平台 ===================== */
.b2b-plats{background:var(--b2b-navy-0);}
.b2b-plats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;}
.b2b-plat{display:flex;flex-direction:column;align-items:center;gap:12px;padding:26px 18px;border-radius:var(--b2b-radius);background:linear-gradient(180deg,rgba(255,255,255,.05),rgba(255,255,255,.02));border:1px solid var(--b2b-line);transition:transform .4s ease,border-color .4s ease,box-shadow .4s ease;}
.b2b-plat:hover{transform:translateY(-6px);border-color:rgba(212,175,55,.5);box-shadow:var(--b2b-shadow-soft);}
.b2b-plat-logo{width:64px;height:64px;border-radius:18px;display:flex;align-items:center;justify-content:center;background:var(--b2b-gold-soft);border:1px solid rgba(212,175,55,.28);font-size:14px;font-weight:800;color:var(--b2b-gold-2);text-align:center;line-height:1.15;padding:6px;}
.b2b-plat h3{font-size:16px;font-weight:700;color:#fff;margin:0;}
.b2b-plat span{font-size:12.5px;color:var(--b2b-txt-dim);text-align:center;}

/* ===================== 服务套餐 ===================== */
.b2b-plan{background:var(--b2b-navy-1);}
.b2b-plan-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;align-items:stretch;}
.b2b-plan-item{position:relative;display:flex;flex-direction:column;padding:38px 30px;border-radius:26px;background:linear-gradient(180deg,rgba(255,255,255,.05),rgba(255,255,255,.02));border:1px solid var(--b2b-line);transition:transform .4s ease,box-shadow .4s ease,border-color .4s ease;}
.b2b-plan-item:hover{transform:translateY(-8px);box-shadow:var(--b2b-shadow);}
.b2b-plan-item.featured{border-color:rgba(212,175,55,.55);box-shadow:0 18px 50px rgba(212,175,55,.16);}
.b2b-plan-badge{position:absolute;top:-13px;left:50%;transform:translateX(-50%);padding:7px 22px;border-radius:20px;background:var(--b2b-gold-grad);color:#3a2c08;font-size:12.5px;font-weight:700;letter-spacing:1px;box-shadow:0 8px 20px rgba(212,175,55,.4);}
.b2b-plan-name{font-size:22px;font-weight:700;color:#fff;text-align:center;margin:6px 0 18px;}
.b2b-plan-price{text-align:center;margin-bottom:8px;}
.b2b-plan-price .cur{font-size:22px;color:var(--b2b-gold);vertical-align:top;font-weight:600;}
.b2b-plan-price .amt{font-size:46px;font-weight:800;font-family:var(--b2b-serif);color:#fff;line-height:1;}
.b2b-plan-price .per{font-size:15px;color:var(--b2b-txt-dim);margin-left:4px;}
.b2b-plan-desc{text-align:center;font-size:13.5px;color:var(--b2b-txt-dim);margin:0 0 22px;}
.b2b-plan-feats{list-style:none;padding:0;margin:0 0 26px;flex:1;}
.b2b-plan-feats li{display:flex;align-items:center;gap:11px;padding:10px 0;font-size:14px;color:var(--b2b-txt);border-bottom:1px dashed var(--b2b-line);}
.b2b-plan-feats li i{font-size:16px;color:var(--b2b-gold);}
.b2b-plan-feats li.off{color:var(--b2b-txt-mute);}
.b2b-plan-feats li.off i{color:var(--b2b-txt-mute);}
.b2b-plan-btn{display:block;text-align:center;padding:14px;border-radius:40px;font-weight:600;text-decoration:none;font-size:15px;transition:transform .3s ease,box-shadow .3s ease;}
.b2b-plan-btn.gold{background:var(--b2b-gold-grad);color:#3a2c08;box-shadow:0 12px 28px rgba(212,175,55,.32);}
.b2b-plan-btn.gold:hover{transform:translateY(-3px);box-shadow:0 16px 38px rgba(212,175,55,.46);}
.b2b-plan-btn.outline{background:transparent;color:var(--b2b-txt);border:1px solid var(--b2b-line-2);}
.b2b-plan-btn.outline:hover{transform:translateY(-3px);border-color:var(--b2b-gold);color:var(--b2b-gold-2);}
.b2b-plan-note{margin-top:30px;text-align:center;font-size:13px;color:var(--b2b-txt-mute);display:flex;align-items:center;justify-content:center;gap:8px;flex-wrap:wrap;}
.b2b-plan-note i{color:var(--b2b-gold);}

/* ===================== 数据展示（深色带） ===================== */
.b2b-data{background:radial-gradient(120% 120% at 70% 0%,#16213f 0%,#0c142c 50%,#070d1f 100%);}
.b2b-data .b2b-eyebrow{color:var(--b2b-gold-2);}
.b2b-data .b2b-title{color:#fff;}
.b2b-data .b2b-sub{color:var(--b2b-txt-dim);}
.b2b-data-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:10px;}
.b2b-data-cell{text-align:center;padding:30px 16px;border-radius:var(--b2b-radius);background:rgba(255,255,255,.04);border:1px solid var(--b2b-line);}
.b2b-data-num{font-family:var(--b2b-serif);font-size:clamp(34px,4vw,46px);font-weight:800;color:var(--b2b-gold);line-height:1;}
.b2b-data-num em{font-style:normal;font-size:.55em;margin-left:2px;color:var(--b2b-gold-2);}
.b2b-data-lab{font-size:13.5px;color:var(--b2b-txt-dim);margin-top:12px;}
.b2b-data-disc{font-size:12.5px;color:var(--b2b-txt-mute);margin-top:30px;text-align:center;line-height:1.8;max-width:880px;margin-left:auto;margin-right:auto;}

/* ===================== 为什么选择我们 ===================== */
.b2b-why{background:var(--b2b-navy-1);}
.b2b-why-list{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.b2b-why-item{display:flex;gap:16px;padding:26px 22px;border-radius:var(--b2b-radius);background:linear-gradient(180deg,rgba(255,255,255,.04),rgba(255,255,255,.015));border:1px solid var(--b2b-line);transition:transform .4s ease,border-color .4s ease;}
.b2b-why-item:hover{transform:translateY(-6px);border-color:rgba(212,175,55,.5);}
.b2b-why-no{font-family:var(--b2b-serif);font-size:26px;font-weight:800;color:var(--b2b-gold);flex-shrink:0;line-height:1.4;}
.b2b-why-item h3{font-size:16.5px;font-weight:700;color:#fff;margin:0 0 8px;}
.b2b-why-item p{font-size:13.5px;color:var(--b2b-txt-dim);line-height:1.8;margin:0;}

/* ===================== FAQ ===================== */
.b2b-faq{background:var(--b2b-navy-0);}
.b2b-faq-list{max-width:880px;margin:0 auto;display:flex;flex-direction:column;gap:16px;}
.b2b-faq-list details{background:rgba(255,255,255,.04);border:1px solid var(--b2b-line);border-radius:18px;overflow:hidden;transition:border-color .3s ease,box-shadow .3s ease;}
.b2b-faq-list details[open]{border-color:rgba(212,175,55,.5);box-shadow:0 10px 30px rgba(0,0,0,.25);}
.b2b-faq-list summary{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:22px 26px;cursor:pointer;font-size:16px;font-weight:600;color:#fff;list-style:none;}
.b2b-faq-list summary::-webkit-details-marker{display:none;}
.b2b-faq-ic{flex-shrink:0;width:34px;height:34px;border-radius:50%;display:flex;align-items:center;justify-content:center;background:var(--b2b-gold-soft);border:1px solid rgba(212,175,55,.3);color:var(--b2b-gold-2);transition:transform .3s ease;}
.b2b-faq-list details[open] .b2b-faq-ic{transform:rotate(45deg);}
.b2b-faq-a{padding:0 26px 22px;font-size:14.5px;color:var(--b2b-txt-dim);line-height:1.9;}

/* ===================== CTA ===================== */
.b2b-cta{position:relative;overflow:hidden;background:radial-gradient(120% 140% at 50% 0%,#1d2b50 0%,#0c142c 60%,#070d1f 100%);text-align:center;}
.b2b-cta::before{content:"";position:absolute;inset:0;background-image:linear-gradient(var(--b2b-line) 1px,transparent 1px),linear-gradient(90deg,var(--b2b-line) 1px,transparent 1px);background-size:54px 54px;mask-image:radial-gradient(circle at 50% 30%,#000,transparent 70%);opacity:.4;}
.b2b-cta .container{position:relative;z-index:2;}
.b2b-cta-title{font-family:var(--b2b-serif);font-size:clamp(28px,4vw,42px);font-weight:700;color:#fff;margin:0 0 16px;}
.b2b-cta-desc{font-size:16px;color:var(--b2b-txt-dim);margin:0 auto 32px;max-width:560px;}
.b2b-cta-acts{display:flex;flex-wrap:wrap;gap:16px;justify-content:center;}
.b2b-cta-contact{margin-top:24px;display:flex;flex-wrap:wrap;gap:14px 28px;justify-content:center;font-size:14px;color:var(--b2b-txt-dim);}
.b2b-cta-contact a{color:var(--b2b-gold-2);text-decoration:none;}
.b2b-cta-contact a:hover{text-decoration:underline;}
.b2b-cta-disc{font-size:12.5px;color:var(--b2b-txt-mute);margin:20px 0 30px;}

/* ===================== 响应式 ===================== */
@media (max-width:1080px){
  .b2b-hero-inner{grid-template-columns:1fr;gap:48px;}
  .b2b-hero-visual{order:-1;}
  .b2b-hero-copy{max-width:100%;}
  .b2b-adv-grid,.b2b-matrix-grid,.b2b-why-list,.b2b-plats-grid{grid-template-columns:repeat(2,1fr);}
  .b2b-flow-grid,.b2b-plan-grid{grid-template-columns:repeat(2,1fr);}
  .b2b-flow-grid::before{display:none;}
  .b2b-data-grid{grid-template-columns:repeat(2,1fr);}
}
@media (max-width:680px){
  .b2b-adv-grid,.b2b-matrix-grid,.b2b-why-list,.b2b-flow-grid,.b2b-plan-grid,.b2b-data-grid,.b2b-plats-grid{grid-template-columns:1fr;}
  .b2b-hero-stats{gap:14px;}
  .b2b-stat-div{display:none;}
  .b2b-btn,.b2b-cta-acts .b2b-btn{width:100%;justify-content:center;}
  .b2b-hero-title{font-size:32px;}
  .b2b-tags-row{gap:9px;}
  .b2b-tag{padding:9px 16px;font-size:13px;}
  .b2b-mock{width:290px;}
}