/*! 腾树 AI 在线监测系统专题页样式 v2 | 与 base.css 并行加载，独立配色体系
 * 优化：视觉细节、动画、响应式（1024/768/480 三档）、性能与无障碍
 */
:root{
    --ai-ink:#0b3943;
    --ai-teal:#0e6b78;
    --ai-teal-d:#0a4d57;
    --ai-cyan:#7fb8c2;
    --ai-amber:#c8761f;
    --ai-amber-l:#e0963f;
    --ai-bg:#f5f9fa;
    --ai-card:#fff;
    --ai-line:#dbe8ec;
    --ai-muted:#5a7680;
    --ai-body:#27474f;
    --ai-shadow-sm:0 2px 8px rgba(11,57,67,.06);
    --ai-shadow:0 10px 30px rgba(11,57,67,.10);
    --ai-shadow-lg:0 22px 50px rgba(11,57,67,.14);
    --ai-shadow-amber:0 14px 32px rgba(200,118,31,.28);
    --ai-ease:cubic-bezier(.4,.0,.2,1);
}

/* ====== Hero ====== */
.ai-hero{position:relative;background:linear-gradient(155deg,#08323c 0%,#0e6b78 58%,#13808f 100%);color:#fff;padding:76px 0 92px;overflow:hidden}
.ai-hero::before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(159,211,220,.07) 1px,transparent 1px),linear-gradient(90deg,rgba(159,211,220,.07) 1px,transparent 1px);background-size:46px 46px;mask-image:linear-gradient(to bottom,rgba(0,0,0,.9),transparent 85%);-webkit-mask-image:linear-gradient(to bottom,rgba(0,0,0,.9),transparent 85%);pointer-events:none}
.ai-hero::after{content:"";position:absolute;right:-120px;top:-80px;width:380px;height:380px;border-radius:50%;background:radial-gradient(circle,rgba(224,150,63,.32),transparent 65%);filter:blur(8px);pointer-events:none;animation:ai-float 9s ease-in-out infinite alternate}
@keyframes ai-float{0%{transform:translateY(0) rotate(0)}100%{transform:translateY(-18px) rotate(2deg)}}
.ai-hero .container{position:relative;z-index:2}
.ai-brandline{display:flex;align-items:center;gap:12px;font-weight:800;letter-spacing:.14em;font-size:15px;margin-bottom:38px}
.ai-brandline .dot{width:11px;height:11px;border-radius:3px;background:var(--ai-amber-l);transform:rotate(45deg);box-shadow:0 0 14px rgba(224,150,63,.7)}
.ai-brandline small{font-weight:600;opacity:.7;font-size:11px;letter-spacing:.22em}
.ai-hero h1{font-size:clamp(30px,5.4vw,52px);line-height:1.2;font-weight:800;letter-spacing:.01em;max-width:16em;margin:0;text-shadow:0 2px 16px rgba(0,0,0,.18)}
.ai-hero h1 em{font-style:normal;color:#ffd9a8;background:linear-gradient(120deg,#ffd9a8,#ffb86b);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;position:relative}
.ai-hero .ai-sub{margin-top:20px;font-size:clamp(15px,2.1vw,19px);color:#cfe6ea;max-width:34em;line-height:1.8}
.ai-cta{margin-top:34px;display:flex;flex-wrap:wrap;gap:14px}
.ai-btn{display:inline-flex;align-items:center;gap:8px;padding:13px 26px;border-radius:999px;font-weight:700;font-size:15px;transition:transform .22s var(--ai-ease),box-shadow .22s var(--ai-ease),background .22s var(--ai-ease);text-decoration:none;will-change:transform}
.ai-btn:hover{transform:translateY(-2px);text-decoration:none}
.ai-btn:focus-visible{outline:3px solid rgba(255,217,168,.6);outline-offset:3px}
.ai-btn-primary{background:var(--ai-amber-l);color:#3a2407;box-shadow:var(--ai-shadow-amber)}
.ai-btn-primary:hover{color:#3a2407;background:#ecaa57;box-shadow:0 18px 38px rgba(200,118,31,.42)}
.ai-btn-ghost{background:rgba(255,255,255,.1);color:#fff;border:1px solid rgba(255,255,255,.35);backdrop-filter:blur(6px)}
.ai-btn-ghost:hover{color:#fff;background:rgba(255,255,255,.18);border-color:rgba(255,255,255,.55)}
.ai-btn-lg{padding:15px 34px;font-size:16px}
.ai-hero-tags{margin-top:30px;display:flex;flex-wrap:wrap;gap:10px}
.ai-hero-tags span{font-size:13px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.18);border-radius:999px;padding:6px 15px;color:#dff0f3;transition:background .2s,border-color .2s,transform .2s;cursor:default}
.ai-hero-tags span:hover{background:rgba(255,217,168,.18);border-color:rgba(255,217,168,.4);transform:translateY(-1px)}

/* ====== 通用块 ====== */
.ai-section{padding:clamp(46px,7vw,78px) 0;background:var(--ai-bg);position:relative}
.ai-section.ai-alt{background:#fff}
.ai-section.ai-alt::before{content:"";position:absolute;top:0;left:0;right:0;height:1px;background:linear-gradient(90deg,transparent,var(--ai-line) 20%,var(--ai-line) 80%,transparent)}
.ai-sec-k{font-size:13px;font-weight:800;letter-spacing:.22em;color:var(--ai-amber);margin-bottom:10px;display:inline-flex;align-items:center;gap:8px}
.ai-sec-k::before{content:"";width:24px;height:2px;background:var(--ai-amber);border-radius:1px;display:inline-block}
.ai-sec-t{font-size:clamp(23px,3.4vw,33px);font-weight:800;color:var(--ai-ink);line-height:1.3;margin:0}
.ai-sec-d{margin-top:12px;color:var(--ai-muted);font-size:15.5px;max-width:46em;line-height:1.75}

/* ====== 痛点条 ====== */
.ai-pain{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:34px}
.ai-pain .p{background:#fff;border:1px solid var(--ai-line);border-radius:14px;padding:22px 18px;border-top:3px solid var(--ai-amber-l);transition:transform .25s var(--ai-ease),box-shadow .25s var(--ai-ease),border-color .25s var(--ai-ease)}
.ai-pain .p:hover{transform:translateY(-4px);box-shadow:var(--ai-shadow);border-color:#cfe1e6}
.ai-pain .p b{display:block;color:var(--ai-ink);font-size:15px;margin-bottom:6px}
.ai-pain .p span{font-size:13px;color:var(--ai-muted);line-height:1.65}

/* ====== 原理流程 ====== */
.ai-flow{display:grid;grid-template-columns:repeat(4,1fr);gap:0;margin-top:36px;counter-reset:step}
.ai-flow .f{position:relative;background:#fff;border:1px solid var(--ai-line);padding:28px 18px 24px;text-align:center;transition:background .25s var(--ai-ease),box-shadow .25s var(--ai-ease)}
.ai-flow .f:hover{background:linear-gradient(180deg,#fff,#f7fbfc);box-shadow:var(--ai-shadow-sm)}
.ai-flow .f:first-child{border-radius:14px 0 0 14px}
.ai-flow .f:last-child{border-radius:0 14px 14px 0}
.ai-flow .f:not(:last-child){border-right:none}
.ai-flow .f .ic{font-size:30px;display:inline-block;transition:transform .35s var(--ai-ease)}
.ai-flow .f:hover .ic{transform:scale(1.15) translateY(-2px)}
.ai-flow .f h4{margin:14px 0 6px;font-size:16px;color:var(--ai-ink)}
.ai-flow .f p{font-size:12.8px;color:var(--ai-muted);line-height:1.6;margin:0}
.ai-flow .f .num{position:absolute;top:10px;left:12px;font-size:12px;font-weight:800;color:var(--ai-cyan)}
.ai-flow-note{margin-top:18px;text-align:center;color:var(--ai-teal);font-weight:700;font-size:15px}
.ai-flow-note::before{content:"↻ ";color:var(--ai-amber)}

/* ====== 行业 ====== */
.ai-inds{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:34px}
.ai-ind{background:#fff;border:1px solid var(--ai-line);border-radius:16px;padding:24px 22px;transition:box-shadow .25s var(--ai-ease),transform .25s var(--ai-ease),border-color .25s var(--ai-ease)}
.ai-ind:hover{box-shadow:var(--ai-shadow);transform:translateY(-4px);border-color:#cfe1e6}
.ai-ind .ic{width:46px;height:46px;border-radius:12px;background:linear-gradient(150deg,#e6f1f4,#d3e7ec);display:grid;place-items:center;font-size:23px;margin-bottom:14px;transition:transform .3s var(--ai-ease)}
.ai-ind:hover .ic{transform:scale(1.08) rotate(-3deg)}
.ai-ind h4{font-size:17px;color:var(--ai-ink);margin:0 0 6px}
.ai-ind p{font-size:13.3px;color:var(--ai-muted);margin:0;line-height:1.65}

/* ====== 场景 ====== */
.ai-scn{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:34px}
.ai-scn .s{display:flex;gap:16px;background:#fff;border:1px solid var(--ai-line);border-radius:14px;padding:20px;transition:box-shadow .25s var(--ai-ease),transform .25s var(--ai-ease),border-color .25s var(--ai-ease)}
.ai-scn .s:hover{box-shadow:var(--ai-shadow-sm);transform:translateY(-2px);border-color:#cfe1e6}
.ai-scn .s .ic{flex:none;width:44px;height:44px;border-radius:11px;background:var(--ai-teal);color:#fff;display:grid;place-items:center;font-size:21px;transition:transform .3s var(--ai-ease)}
.ai-scn .s:hover .ic{transform:scale(1.08)}
.ai-scn .s h4{font-size:15.5px;color:var(--ai-ink);margin:0 0 4px}
.ai-scn .s p{font-size:13px;color:var(--ai-muted);margin:0;line-height:1.65}

/* ====== 数字 ====== */
.ai-stats{background:linear-gradient(150deg,#0a4d57,#0e6b78);border-radius:22px;padding:clamp(30px,5vw,50px);color:#fff;display:grid;grid-template-columns:repeat(4,1fr);gap:26px 18px;margin-top:10px;position:relative;overflow:hidden;box-shadow:var(--ai-shadow)}
.ai-stats::before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 20% 10%,rgba(255,217,168,.12),transparent 50%);pointer-events:none}
.ai-stats .st{text-align:center;position:relative;z-index:1;transition:transform .25s var(--ai-ease)}
.ai-stats .st:hover{transform:translateY(-3px)}
.ai-stats .v{font-size:clamp(26px,3.8vw,40px);font-weight:800;color:#ffd9a8;line-height:1.1;transition:text-shadow .25s var(--ai-ease)}
.ai-stats .st:hover .v{text-shadow:0 0 22px rgba(255,217,168,.55)}
.ai-stats .k{margin-top:8px;font-size:13.5px;color:#cfe6ea;line-height:1.5}
.ai-stats-note{margin-top:14px;text-align:center;font-size:12.5px;color:var(--ai-muted)}

/* ====== 案例分类筛选条 ====== */
.ai-case-filter{display:flex;flex-wrap:wrap;gap:10px;margin:22px 0 4px}
.ai-case-filter span{font-size:12.5px;font-weight:700;letter-spacing:.05em;color:var(--ai-teal-d);background:#fff;border:1px solid var(--ai-line);border-radius:999px;padding:6px 14px;cursor:default;transition:transform .2s var(--ai-ease),box-shadow .2s var(--ai-ease)}
.ai-case-filter span:hover{transform:translateY(-1px);box-shadow:var(--ai-shadow-sm)}
.ai-case-filter span.own{color:var(--ai-amber);background:#fff8ef;border-color:#f1d9b5}

/* ====== 案例 2x2 网格（重点优化）====== */
.ai-cases{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:24px}
.ai-case{position:relative;background:#fff;border:1px solid var(--ai-line);border-radius:18px;overflow:hidden;display:flex;flex-direction:column;transition:box-shadow .28s var(--ai-ease),transform .28s var(--ai-ease),border-color .28s var(--ai-ease)}
.ai-case:hover{box-shadow:var(--ai-shadow-lg);transform:translateY(-6px);border-color:#cfe1e6}
.ai-case::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,transparent,var(--ai-teal),transparent);opacity:0;transition:opacity .28s var(--ai-ease)}
.ai-case:hover::before{opacity:1}
.ai-case.b::before{background:linear-gradient(90deg,transparent,var(--ai-amber-l),transparent)}
.ai-case .ch{padding:22px 24px 0;position:relative}
.ai-case .badge-row{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-bottom:12px}
.ai-case .badge{display:inline-block;font-size:11.5px;font-weight:800;letter-spacing:.08em;color:#fff;background:var(--ai-teal);border-radius:999px;padding:4px 12px}
.ai-case.b .badge{background:var(--ai-amber)}
.ai-case .own-tag{display:inline-flex;align-items:center;gap:4px;font-size:11.5px;font-weight:800;letter-spacing:.04em;color:#fff;background:linear-gradient(135deg,#c8761f,#e0963f);border-radius:999px;padding:4px 10px 4px 8px;box-shadow:0 4px 12px rgba(200,118,31,.25)}
.ai-case .own-tag::before{content:"★";font-size:11px}
.ai-case .cat{font-size:11.5px;color:var(--ai-muted);background:#f1f7f9;border:1px solid #e1eef0;border-radius:999px;padding:3px 10px;font-weight:600}
.ai-case .ic-circle{position:absolute;top:18px;right:20px;width:40px;height:40px;border-radius:50%;background:linear-gradient(135deg,#e6f1f4,#d3e7ec);display:grid;place-items:center;font-size:20px;color:var(--ai-teal-d);transition:transform .35s var(--ai-ease)}
.ai-case:hover .ic-circle{transform:scale(1.1) rotate(-6deg)}
.ai-case.b .ic-circle{background:linear-gradient(135deg,#fff0db,#ffe2b3);color:var(--ai-amber)}
.ai-case h4{font-size:17.5px;color:var(--ai-ink);line-height:1.45;padding-right:48px;margin:0 0 6px}
.ai-case .org{font-size:12.5px;color:var(--ai-muted);margin:0}
.ai-case .cb{padding:14px 24px 4px;flex:1}
.ai-case ul{list-style:none;padding:0;margin:0}
.ai-case li{position:relative;padding-left:20px;font-size:13.4px;color:var(--ai-body);margin-bottom:9px;line-height:1.65}
.ai-case li::before{content:"▸";position:absolute;left:0;color:var(--ai-amber);font-weight:800;transition:transform .2s var(--ai-ease)}
.ai-case li:hover::before{transform:translateX(2px)}
.ai-case li b{color:var(--ai-teal-d)}
.ai-case.b li b{color:var(--ai-amber)}
.ai-case .metrics{display:flex;flex-wrap:wrap;gap:8px;margin:8px 0 4px}
.ai-case .metrics span{font-size:11.5px;font-weight:700;color:var(--ai-teal-d);background:#eef6f8;border:1px solid #d6e8ec;border-radius:6px;padding:4px 10px;transition:transform .2s var(--ai-ease),box-shadow .2s var(--ai-ease)}
.ai-case .metrics span:hover{transform:translateY(-1px);box-shadow:var(--ai-shadow-sm)}
.ai-case.b .metrics span{color:var(--ai-amber);background:#fff6e8;border-color:#f0d9b1}
.ai-case .cs{padding:10px 24px 20px;font-size:12px;color:var(--ai-muted);border-top:1px dashed #e6eff2;margin-top:8px;line-height:1.65}
.ai-case .cs a{word-break:break-all}
.ai-case .cs .src-lbl{color:var(--ai-teal);font-weight:700}
.ai-case.b .cs .src-lbl{color:var(--ai-amber)}
.ai-more-cases{margin-top:22px;font-size:13.5px;color:var(--ai-muted);background:#fff;border:1px dashed var(--ai-line);border-radius:12px;padding:15px 20px;line-height:1.75;transition:border-color .2s}
.ai-more-cases:hover{border-color:var(--ai-cyan)}

/* ====== 腾树自有案例展开联想子块（视觉减压优化版）====== */
.ai-case-own-detail .sub-block{margin-top:14px;background:linear-gradient(180deg,#fffbf3,#fff7e8);border:1px solid #f5e3c4;border-radius:10px;padding:14px 16px}
.ai-case-own-detail .sub-row{display:grid;grid-template-columns:96px 1fr;gap:10px;padding:7px 0;font-size:12.5px;line-height:1.65;border-bottom:1px dashed #f0d9b1}
.ai-case-own-detail .sub-row:last-child{border-bottom:none}
.ai-case-own-detail .sub-lbl{font-weight:800;color:var(--ai-amber);letter-spacing:.04em;white-space:nowrap;display:flex;align-items:center;gap:4px}
.ai-case-own-detail .sub-lbl::before{content:"";width:3px;height:12px;background:var(--ai-amber);border-radius:1px}
.ai-case-own-detail .sub-val{color:var(--ai-body)}

/* ====== 公开案例补充子块（teal 配色，与自有案例区分）====== */
.ai-case .sub-block{margin-top:14px;background:linear-gradient(180deg,#f6fbfc,#eef7f9);border:1px solid #d8e9ed;border-radius:10px;padding:14px 16px}
.ai-case .sub-row{display:grid;grid-template-columns:96px 1fr;gap:10px;padding:7px 0;font-size:12.5px;line-height:1.65;border-bottom:1px dashed #cfe1e6}
.ai-case .sub-row:last-child{border-bottom:none}
.ai-case .sub-lbl{font-weight:800;color:var(--ai-teal-d);letter-spacing:.04em;white-space:nowrap;display:flex;align-items:center;gap:4px}
.ai-case .sub-lbl::before{content:"";width:3px;height:12px;background:var(--ai-teal-d);border-radius:1px}
.ai-case .sub-val{color:var(--ai-body)}
/* 自有案例（带 .b 类）覆盖为 amber 配色 */
.ai-case.b .sub-block{background:linear-gradient(180deg,#fffbf3,#fff7e8);border-color:#f5e3c4}
.ai-case.b .sub-row{border-bottom-color:#f0d9b1}
.ai-case.b .sub-lbl{color:var(--ai-amber)}
.ai-case.b .sub-lbl::before{background:var(--ai-amber)}
@media(max-width:520px){
    .ai-case .sub-row{grid-template-columns:1fr;gap:2px}
    .ai-case .sub-lbl{font-size:11.5px}
}

/* ====== 为什么 ====== */
.ai-why{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:34px}
.ai-why .w{background:linear-gradient(165deg,#f4f9fb,#e8f2f5);border:1px solid #d2e5ea;border-radius:18px;padding:28px 24px;position:relative;overflow:hidden;transition:box-shadow .28s var(--ai-ease),transform .28s var(--ai-ease)}
.ai-why .w:hover{box-shadow:var(--ai-shadow);transform:translateY(-4px)}
.ai-why .w::after{content:"";position:absolute;right:-30px;top:-30px;width:100px;height:100px;border-radius:50%;background:radial-gradient(circle,rgba(200,118,31,.13),transparent 70%);pointer-events:none}
.ai-why .w .ic{font-size:28px;display:inline-block;transition:transform .35s var(--ai-ease)}
.ai-why .w:hover .ic{transform:scale(1.12)}
.ai-why .w h4{margin:14px 0 8px;font-size:17px;color:var(--ai-ink)}
.ai-why .w p{font-size:13.6px;color:var(--ai-muted);margin:0;line-height:1.7}
.ai-why .w b{color:var(--ai-teal-d)}
.ai-creds{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px;justify-content:center}
.ai-creds span{font-size:13px;background:#fff;border:1px solid var(--ai-line);border-radius:999px;padding:7px 16px;color:var(--ai-teal-d);font-weight:600;transition:transform .2s var(--ai-ease),box-shadow .2s var(--ai-ease),border-color .2s var(--ai-ease)}
.ai-creds span:hover{transform:translateY(-2px);box-shadow:var(--ai-shadow-sm);border-color:#cfe1e6}

/* ====== 转化带 ====== */
.ai-cta-band{background:linear-gradient(150deg,#08323c,#0e6b78);border-radius:24px;color:#fff;padding:clamp(34px,6vw,60px);text-align:center;position:relative;overflow:hidden;box-shadow:var(--ai-shadow)}
.ai-cta-band::before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 50% 0%,rgba(255,217,168,.18),transparent 60%);pointer-events:none}
.ai-cta-band h3{font-size:clamp(22px,3.4vw,32px);font-weight:800;margin:0 0 14px;position:relative}
.ai-cta-band p{margin:14px auto 26px;color:#cfe6ea;max-width:40em;font-size:15px;line-height:1.75;position:relative}
.ai-cta-band .ai-btn-primary{font-size:16px;padding:15px 34px}
.ai-cta-band .ai-btn-ghost{font-size:16px;padding:15px 34px;margin-left:8px}
.ai-cinfo{display:flex;flex-wrap:wrap;justify-content:center;gap:14px 34px;margin-top:30px;font-size:14.5px;color:#eaf4f6;position:relative}
.ai-cinfo b{color:#ffd9a8;margin-right:6px}

/* ====== FAQ ====== */
.ai-faq-list{list-style:none;padding:0;margin:30px auto 0;max-width:860px}
.ai-faq-list li{margin-bottom:12px}
.ai-faq-item{background:#fff;border:1px solid var(--ai-line);border-radius:12px;overflow:hidden;transition:box-shadow .25s var(--ai-ease),border-color .25s var(--ai-ease)}
.ai-faq-item[open]{box-shadow:var(--ai-shadow);border-color:#cfe1e6}
.ai-faq-item summary{padding:16px 20px;font-size:15px;font-weight:600;color:var(--ai-ink);cursor:pointer;list-style:none;position:relative;padding-right:36px;transition:background .2s var(--ai-ease),color .2s var(--ai-ease)}
.ai-faq-item summary:hover{background:#f7fbfc;color:var(--ai-teal-d)}
.ai-faq-item summary:focus-visible{outline:3px solid var(--ai-cyan);outline-offset:-3px}
.ai-faq-item summary::-webkit-details-marker{display:none}
.ai-faq-item summary::after{content:"+";position:absolute;right:20px;top:50%;transform:translateY(-50%);font-size:20px;color:var(--ai-teal);font-weight:700;transition:transform .25s var(--ai-ease),color .2s var(--ai-ease)}
.ai-faq-item[open] summary::after{content:"−";color:var(--ai-amber)}
.ai-faq-answer{padding:0 20px 18px;font-size:14px;color:var(--ai-body);line-height:1.75;animation:ai-faq-open .25s var(--ai-ease)}
@keyframes ai-faq-open{0%{opacity:0;transform:translateY(-4px)}100%{opacity:1;transform:translateY(0)}}

/* ====== 响应式 ====== */
@media(max-width:1024px){
    .ai-inds{grid-template-columns:repeat(2,1fr)}
    .ai-flow{grid-template-columns:repeat(2,1fr)}
    .ai-flow .f:first-child{border-radius:14px 0 0 0}
    .ai-flow .f:nth-child(2){border-radius:0 14px 0 0}
    .ai-flow .f:nth-child(3){border-radius:0 0 0 14px}
    .ai-flow .f:last-child{border-radius:0 0 14px 0}
    .ai-flow .f:nth-child(2n){border-right:none}
    .ai-flow .f:nth-child(-n+2){border-bottom:none}
    .ai-flow .f:nth-child(odd){border-right:1px solid var(--ai-line)}
    .ai-flow .f:nth-child(even){border-right:none}
    .ai-flow .f:not(:last-child){border-right:1px solid var(--ai-line)}
    .ai-flow .f:nth-child(2n){border-right:none!important}
}
@media(max-width:820px){
    .ai-pain{grid-template-columns:repeat(2,1fr)}
    .ai-why{grid-template-columns:1fr}
    .ai-scn{grid-template-columns:1fr}
    .ai-cta-band .ai-btn-ghost{margin-left:0;margin-top:10px}
}
@media(max-width:760px){
    .ai-cases{grid-template-columns:1fr}
    .ai-case h4{padding-right:0}
    .ai-case .ic-circle{display:none}
    .ai-stats{grid-template-columns:1fr 1fr}
}
@media(max-width:520px){
    .ai-pain{grid-template-columns:1fr}
    .ai-hero-tags span{font-size:12px;padding:5px 12px}
    .ai-hero{padding:56px 0 72px}
    .ai-brandline{font-size:13px;margin-bottom:24px}
    .ai-flow{grid-template-columns:1fr}
    .ai-flow .f{border-radius:0!important;border-right:none!important;border-bottom:1px solid var(--ai-line)}
    .ai-flow .f:last-child{border-bottom:none}
    .ai-case-own-detail .sub-row{grid-template-columns:1fr;gap:2px}
    .ai-case-own-detail .sub-lbl{font-size:11.5px}
    .ai-cinfo{font-size:13px;gap:10px 24px}
}
@media(max-width:380px){
    .ai-hero-tags{justify-content:center}
    .ai-btn{width:100%;justify-content:center}
}

/* ====== 无障碍：尊重减少动效偏好 ====== */
@media(prefers-reduced-motion:reduce){
    .ai-hero::after,.ai-faq-answer{animation:none}
    .ai-btn,.ai-case,.ai-ind,.ai-pain .p,.ai-flow .f,.ai-stats .st,.ai-why .w,.ai-faq-item,.ai-creds span,.ai-case .metrics span,.ai-scn .s{transition:none}
    .ai-case:hover,.ai-ind:hover,.ai-pain .p:hover,.ai-why .w:hover,.ai-scn .s:hover,.ai-stats .st:hover{transform:none}
}

/* ====== 打印优化 ====== */
@media print{
    .ai-hero{background:#0b3943;color:#fff}
    .ai-hero h1 em{-webkit-text-fill-color:#ffd9a8;background:none}
    .ai-hero::after,.ai-hero::before{display:none}
    .ai-section{padding:24px 0}
    .ai-case,.ai-ind,.ai-pain .p,.ai-why .w,.ai-stats{box-shadow:none;page-break-inside:avoid}
    .ai-cta-band{background:#0b3943;color:#fff}
    .floating-cta,.ai-hero-tags{display:none}
}