@charset "utf-8";

/* ═══════════ 设计变量（科技蓝·与首页主题一致） ═══════════ */
:root{
    --bd-ink:#0f172a;
    --bd-ink-2:#16233f;
    --bd-warm:#f6f9ff;
    --bd-warm-2:#eef2f7;
    --bd-slate:#5b6b85;
    --bd-blue:#206ae4;
    --bd-blue-2:#4d8fff;
    --bd-blue-3:#0ea5e9;
    --bd-blue-deep:#1860d8;
    --bd-grad:linear-gradient(135deg,#4d8fff 0%,#206ae4 50%,#1860d8 100%);
    --bd-grad-soft:linear-gradient(135deg,rgba(32,106,228,.18),rgba(77,143,255,.10));
    --bd-line:rgba(32,106,228,.20);
    --bd-shadow:0 18px 44px rgba(16,24,40,.10);
    --bd-shadow-lg:0 40px 80px rgba(10,15,40,.20);
}

.bd-main{width:100%;min-height:100vh;background:#fff;overflow:hidden;}
.wrap{width:100%;margin:0 auto;padding:0 32px;}

/* 区块间距 */
.bd-services,.bd-ideas,.bd-steps-sec,.bd-flow-sec,.bd-ind-sec{padding:104px 0;}
.bd-ai{padding:108px 0;background:var(--bd-ink);overflow:hidden;}
.bd-cta{padding:108px 0;background:var(--bd-ink);overflow:hidden;}

/* 滚动渐显 */
.bd-reveal{opacity:0;transform:translateY(30px);transition:opacity .8s cubic-bezier(.16,1,.3,1),transform .8s cubic-bezier(.16,1,.3,1);}
.bd-reveal.in{opacity:1;transform:none;}

/* 标题块 */
.bd-eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:700;letter-spacing:2px;color:var(--bd-blue);text-transform:uppercase;}
.bd-eyebrow i{font-size:13px;}
.bd-eyebrow-dark{color:var(--bd-blue);}
.bd-gold{background:var(--bd-grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;}
.bd-sub{font-size:15.5px;color:rgba(255,255,255,.66);line-height:1.85;text-align:center;margin:14px auto 0;max-width:660px;}
.bd-sub-dark{color:var(--bd-slate);}
.bd-head{text-align:center;margin-bottom:64px;}
.bd-head-light .bd-eyebrow{color:var(--bd-blue-2);}
.bd-head-light .bd-title{color:#fff;}
.bd-head-light .bd-sub{color:rgba(255,255,255,.66);}
.bd-title{position:relative;font-size:clamp(28px,3.6vw,42px);font-weight:800;line-height:1.22;margin:18px 0 0;color:var(--bd-ink);letter-spacing:-.5px;}
.bd-divider{display:flex;align-items:center;justify-content:center;gap:12px;margin:22px auto 0;}
.bd-divider span{width:54px;height:1px;background:linear-gradient(90deg,transparent,var(--bd-blue));}
.bd-divider span:last-child{background:linear-gradient(90deg,var(--bd-blue),transparent);}
.bd-divider i{color:var(--bd-blue);font-size:11px;transform:rotate(45deg);}

/* 按钮 */
.bd-btn{display:inline-flex;align-items:center;gap:10px;padding:15px 34px;border-radius:50px;font-size:15.5px;font-weight:700;text-decoration:none;transition:all .35s cubic-bezier(.16,1,.3,1);}
.bd-btn-gold{background:var(--bd-grad);color:#fff;box-shadow:0 14px 32px rgba(32,106,228,.34);}
.bd-btn-gold:hover{transform:translateY(-3px);box-shadow:0 20px 44px rgba(32,106,228,.45);}
.bd-btn-ghost{border:1.5px solid rgba(255,255,255,.35);color:#fff;}
.bd-btn-ghost:hover{border-color:#fff;background:rgba(255,255,255,.12);transform:translateY(-3px);}
.bd-head-light .bd-btn-ghost{border-color:var(--bd-line);color:var(--bd-blue-2);}
.bd-head-light .bd-btn-ghost:hover{border-color:var(--bd-blue-2);background:rgba(32,106,228,.12);}

/* ═══════════ 英雄 Banner（全屏·居中） ═══════════ */
.bd-hero{position:relative;min-height:100vh;min-height:100dvh;display:flex;align-items:center;overflow:hidden;padding:150px 0 90px;background:radial-gradient(120% 120% at 50% 0%,#1a3a6b 0%,#0a0e27 50%,#070a1c 100%);}
.bd-hero-bg{position:absolute;inset:0;z-index:0;overflow:hidden;}
.bd-orb{position:absolute;border-radius:50%;filter:blur(80px);opacity:.5;}
.bd-orb-1{width:440px;height:440px;background:radial-gradient(circle,#4d8fff,transparent 70%);top:-140px;left:-60px;opacity:.34;}
.bd-orb-2{width:380px;height:380px;background:radial-gradient(circle,#0ea5e9,transparent 70%);bottom:-160px;right:-100px;opacity:.30;}
.bd-grid-overlay{position:absolute;inset:0;background-image:linear-gradient(rgba(120,170,255,.06) 1px,transparent 1px),linear-gradient(90deg,rgba(120,170,255,.06) 1px,transparent 1px);background-size:54px 54px;mask-image:radial-gradient(circle at 50% 40%,#000 30%,transparent 78%);-webkit-mask-image:radial-gradient(circle at 50% 40%,#000 30%,transparent 78%);}
.bd-hero-inner{position:relative;z-index:2;text-align:center;display:flex;flex-direction:column;align-items:center;width:100%;}
.bd-hero-inner .bd-eyebrow{color:var(--bd-blue-2);}
.bd-hero-title{font-size:clamp(40px,6vw,76px);font-weight:850;line-height:1.08;margin:20px 0 0;color:#fff;letter-spacing:-1.5px;}
.bd-hero-sub{font-size:clamp(16px,2.2vw,22px);color:var(--bd-blue-2);margin:20px 0 0;font-weight:500;}
.bd-words{height:1.5em;overflow:hidden;margin:22px 0 0;font-size:clamp(15px,2vw,19px);font-weight:600;color:rgba(255,255,255,.82);}
.bd-words span{display:block;line-height:1.5em;animation:bdcycle 9s infinite;}
@keyframes bdcycle{0%,17%{transform:translateY(0)}20%,37%{transform:translateY(-1.5em)}40%,57%{transform:translateY(-3em)}60%,77%{transform:translateY(-4.5em)}80%,97%{transform:translateY(-6em)}100%{transform:translateY(-7.5em)}}
.bd-hero-actions{display:flex;flex-wrap:wrap;gap:16px;margin-top:38px;justify-content:center;}
.bd-scroll{position:absolute;left:50%;bottom:30px;transform:translateX(-50%);width:46px;height:46px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:var(--bd-blue-2);font-size:20px;border:1px solid rgba(120,170,255,.25);background:rgba(255,255,255,.04);z-index:3;animation:bdbob 2.4s ease-in-out infinite;text-decoration:none;}
@keyframes bdbob{0%,100%{transform:translate(-50%,0);}50%{transform:translate(-50%,8px);}}

/* ═══════════ 服务类型标签 ═══════════ */
.bd-tags{padding:26px 0;background:#fff;box-shadow:0 4px 24px rgba(16,24,40,.06);position:relative;z-index:5;}
.bd-tags-row{display:flex;gap:12px;flex-wrap:wrap;justify-content:center;}
.bd-tag{padding:10px 22px;border-radius:50px;background:var(--bd-warm);border:1px solid var(--bd-line);font-size:14px;color:var(--bd-slate);text-decoration:none;transition:all .3s ease;}
.bd-tag:hover{background:var(--bd-grad);color:#fff;border-color:transparent;transform:translateY(-2px);box-shadow:0 10px 24px rgba(32,106,228,.28);}
.bd-tag.active{background:var(--bd-grad);color:#fff;border-color:transparent;box-shadow:0 10px 24px rgba(32,106,228,.32);}

/* ═══════════ 服务特色（横向长条） ═══════════ */
.bd-services{background:#fff;}
.bd-svc-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;}
.bd-svc{position:relative;display:flex;align-items:center;gap:20px;padding:26px 28px;border-radius:20px;background:var(--bd-warm);border:1px solid var(--bd-line);box-shadow:var(--bd-shadow);transition:all .4s cubic-bezier(.16,1,.3,1);overflow:hidden;}
.bd-svc::before{content:'';position:absolute;left:0;top:0;bottom:0;width:4px;background:var(--bd-grad);transform:scaleY(0);transform-origin:top;transition:transform .4s;}
.bd-svc:hover{transform:translateY(-6px);box-shadow:var(--bd-shadow-lg);background:#fff;}
.bd-svc:hover::before{transform:scaleY(1);}
.bd-svc-no{font-size:34px;font-weight:850;line-height:1;background:var(--bd-grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;flex-shrink:0;opacity:.85;}
.bd-svc-ico{flex-shrink:0;display:inline-flex;align-items:center;justify-content:center;width:54px;height:54px;border-radius:15px;background:var(--bd-grad-soft);color:var(--bd-blue);font-size:24px;transition:all .4s;}
.bd-svc:hover .bd-svc-ico{background:var(--bd-grad);color:#fff;transform:scale(1.06);}
.bd-svc-body{flex:1;min-width:0;}
.bd-svc-body h3{margin:0 0 8px;font-size:18px;font-weight:700;color:var(--bd-ink);}
.bd-svc-body p{margin:0;font-size:13.5px;line-height:1.75;color:var(--bd-slate);}

/* ═══════════ 设计理念（三栏要点·科技蓝） ═══════════ */
.bd-ideas{position:relative;overflow:hidden;background:linear-gradient(180deg,#fbfcfe 0%,#eef2f7 100%);}
.bd-ideas::before{content:'';position:absolute;top:-140px;right:-120px;width:440px;height:440px;border-radius:50%;background:radial-gradient(circle,rgba(32,106,228,.16),transparent 70%);pointer-events:none;}
.bd-ideas::after{content:'';position:absolute;bottom:-160px;left:-120px;width:440px;height:440px;border-radius:50%;background:radial-gradient(circle,rgba(14,165,233,.14),transparent 70%);pointer-events:none;}
.bd-ideas .wrap{position:relative;z-index:1;}
.bd-eyebrow-acc{color:var(--bd-blue-deep);}
.bd-divider-acc span{background:linear-gradient(90deg,transparent,var(--bd-blue));}
.bd-divider-acc span:last-child{background:linear-gradient(90deg,var(--bd-blue),transparent);}
.bd-divider-acc i{color:var(--bd-blue);}
/* 图标左 / 文字右：要点行 */
.bd-idea-list{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:24px;}
.bd-idea-list li{position:relative;display:flex;align-items:flex-start;gap:20px;padding:30px 32px;border-radius:20px;background:#fff;border:1px solid var(--bd-line);box-shadow:var(--bd-shadow);transition:all .45s cubic-bezier(.16,1,.3,1);}
.bd-idea-list li:hover{transform:translateY(-6px);box-shadow:var(--bd-shadow-lg);border-color:rgba(77,143,255,.45);}
.bd-idea-li-ico{flex-shrink:0;display:inline-flex;align-items:center;justify-content:center;width:60px;height:60px;border-radius:16px;background:var(--bd-grad-soft);color:var(--bd-blue);font-size:26px;transition:all .4s;}
.bd-idea-list li:hover .bd-idea-li-ico{background:var(--bd-grad);color:#fff;transform:scale(1.06);}
.bd-idea-body{flex:1;min-width:0;}
.bd-idea-list h3{margin:0 0 10px;font-size:19px;font-weight:800;color:var(--bd-ink);letter-spacing:-.3px;}
.bd-idea-list p{margin:0;font-size:14px;line-height:1.85;color:var(--bd-slate);}

/* ═══════════ AI + GEO（深色·图标左文字右） ═══════════ */
.bd-ai-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:6px;}
.bd-ai-item{position:relative;display:flex;align-items:flex-start;gap:22px;padding:32px 34px;border-radius:20px;background:rgba(255,255,255,.05);border:1px solid rgba(77,143,255,.18);backdrop-filter:blur(10px);transition:all .4s cubic-bezier(.16,1,.3,1);overflow:hidden;}
.bd-ai-item:hover{transform:translateY(-6px);background:rgba(255,255,255,.09);border-color:rgba(77,143,255,.45);box-shadow:0 26px 50px rgba(0,0,0,.4);}
.bd-ai-li-ico{flex-shrink:0;display:inline-flex;align-items:center;justify-content:center;width:62px;height:62px;border-radius:16px;background:rgba(32,106,228,.16);color:var(--bd-blue-2);font-size:27px;transition:all .4s;}
.bd-ai-item:hover .bd-ai-li-ico{background:var(--bd-grad);color:#fff;transform:scale(1.06);}
.bd-ai-body{flex:1;min-width:0;}
.bd-ai-item h3{margin:0 0 10px;font-size:20px;font-weight:800;color:#fff;}
.bd-ai-item p{margin:0;font-size:14px;line-height:1.8;color:rgba(255,255,255,.66);}
.bd-ai .bd-axis-caps{justify-content:center;margin-top:44px;}
.bd-cap{display:inline-flex;align-items:center;gap:9px;padding:11px 22px;border-radius:50px;font-size:14px;font-weight:600;color:var(--bd-blue-2);background:rgba(32,106,228,.10);border:1px solid rgba(77,143,255,.24);}
.bd-cap i{color:var(--bd-blue);font-size:13px;}

/* ═══════════ 立体式品牌营销（步骤带） ═══════════ */
.bd-steps-sec{background:#fff;}
.bd-steps{display:grid;grid-template-columns:repeat(3,1fr);gap:30px;position:relative;}
.bd-steps::before{content:'';position:absolute;top:42px;left:16%;right:16%;height:2px;background:var(--bd-grad);opacity:.35;}
.bd-step{position:relative;text-align:center;padding:0 10px;}
.bd-step-no{width:84px;height:84px;margin:0 auto 24px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:30px;font-weight:850;color:#fff;background:var(--bd-grad);box-shadow:0 14px 30px rgba(32,106,228,.32);transition:all .4s;position:relative;z-index:2;}
.bd-step:hover .bd-step-no{transform:scale(1.08);box-shadow:0 20px 40px rgba(32,106,228,.45);}
.bd-step h3{margin:0 0 10px;font-size:21px;font-weight:700;color:var(--bd-ink);}
.bd-step p{margin:0;font-size:14px;color:var(--bd-slate);line-height:1.7;}

/* ═══════════ 网站架构（卡片网格） ═══════════ */
.bd-flow-sec{background:var(--bd-warm-2);}
.bd-arch-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;}
.bd-arch-card{position:relative;display:flex;flex-direction:column;gap:14px;padding:30px 26px;border-radius:20px;background:#fff;border:1px solid var(--bd-line);box-shadow:var(--bd-shadow);transition:all .4s cubic-bezier(.16,1,.3,1);overflow:hidden;}
.bd-arch-card::before{content:'';position:absolute;left:0;top:0;bottom:0;width:4px;background:var(--bd-grad);transform:scaleY(0);transform-origin:top;transition:transform .4s;}
.bd-arch-card:hover{transform:translateY(-6px);box-shadow:var(--bd-shadow-lg);}
.bd-arch-card:hover::before{transform:scaleY(1);}
.bd-arch-ico{flex-shrink:0;display:inline-flex;align-items:center;justify-content:center;width:54px;height:54px;border-radius:15px;background:var(--bd-grad-soft);color:var(--bd-blue);font-size:24px;transition:all .4s;}
.bd-arch-card:hover .bd-arch-ico{background:var(--bd-grad);color:#fff;transform:scale(1.06);}
.bd-arch-card h3{margin:0;font-size:18px;font-weight:700;color:var(--bd-ink);}
.bd-arch-card ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:9px;}
.bd-arch-card li{display:flex;align-items:center;gap:9px;font-size:13.5px;color:var(--bd-slate);line-height:1.5;}
.bd-arch-card li::before{content:'';width:6px;height:6px;border-radius:50%;background:var(--bd-blue);flex-shrink:0;}

/* ═══════════ 适用行业（logo 墙） ═══════════ */
.bd-ind-sec{background:#fff;}
.bd-ind-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
.bd-ind{display:flex;flex-direction:column;align-items:center;gap:14px;padding:38px 20px;border-radius:18px;background:var(--bd-warm);border:1px solid var(--bd-line);box-shadow:var(--bd-shadow);transition:all .4s cubic-bezier(.16,1,.3,1);}
.bd-ind:hover{transform:translateY(-8px);border-color:var(--bd-blue);box-shadow:var(--bd-shadow-lg);background:#fff;}
.bd-ind i{font-size:38px;color:var(--bd-blue);transition:all .4s;}
.bd-ind:hover i{transform:scale(1.12);color:var(--bd-blue-2);}
.bd-ind span{font-size:15px;font-weight:600;color:var(--bd-ink);}

/* ═══════════ CTA ═══════════ */
.bd-cta-bg{position:absolute;inset:0;z-index:0;overflow:hidden;}
.bd-cta-inner{position:relative;z-index:2;text-align:center;}
.bd-cta-inner h2{font-size:clamp(28px,3.6vw,42px);font-weight:800;color:#fff;margin:0 0 16px;letter-spacing:-.5px;}
.bd-cta-inner p{font-size:16px;color:rgba(255,255,255,.7);margin:0 0 32px;}
.bd-cta-actions{display:flex;flex-wrap:wrap;gap:16px;justify-content:center;}

/* ═══════════ 响应式 ═══════════ */
@media (max-width:1080px){
    .bd-svc-grid{grid-template-columns:1fr;}
    .bd-idea-list{grid-template-columns:1fr;gap:20px;}
    .bd-ai-grid{grid-template-columns:1fr;gap:22px;}
    .bd-steps{grid-template-columns:1fr;gap:36px;}
    .bd-steps::before{display:none;}
    .bd-ind-grid{grid-template-columns:repeat(2,1fr);}
    .bd-arch-grid{grid-template-columns:repeat(2,1fr);}
}
@media (max-width:768px){
    .bd-services,.bd-ideas,.bd-steps-sec,.bd-flow-sec,.bd-ind-sec{padding:72px 0;}
    .bd-ai,.bd-cta{padding:80px 0;}
    .bd-head{margin-bottom:44px;}
    .bd-tags-row{gap:8px;}
    .bd-tag{padding:8px 16px;font-size:13px;}
    .bd-svc{gap:14px;padding:22px 20px;}
    .bd-svc-no{font-size:28px;}
    .bd-svc-ico{width:46px;height:46px;font-size:20px;border-radius:12px;}
    .bd-ind-grid{grid-template-columns:repeat(2,1fr);}
    .bd-scroll{display:none;}
}