/* ===== AI 数智服务板块 ===== */
.ai-section{background:linear-gradient(160deg,#141414 0%,#2a0d10 55%,#4a0209 100%);color:#fff;position:relative;overflow:hidden}
.ai-section::before{content:"";position:absolute;left:-140px;top:-140px;width:460px;height:460px;border-radius:50%;background:radial-gradient(circle,rgba(230,0,18,.35),transparent 70%)}
.ai-section::after{content:"";position:absolute;right:-100px;bottom:-180px;width:520px;height:520px;border-radius:50%;background:radial-gradient(circle,rgba(230,0,18,.22),transparent 70%)}
.ai-section .container{position:relative;z-index:2}
.ai-section .sec-head .en{color:#ff8a94}
.ai-section .sec-head h2{color:#fff}
.ai-section .sec-head p{color:rgba(255,255,255,.72)}
.ai-section .sec-head .bar{background:var(--red)}
.ai-badge{display:inline-flex;align-items:center;gap:7px;background:rgba(230,0,18,.18);border:1px solid rgba(255,120,130,.4);color:#ffb3b9;font-size:12.5px;padding:5px 14px;border-radius:999px;margin-bottom:14px;letter-spacing:1px}
.ai-badge .dot{width:7px;height:7px;border-radius:50%;background:#33e07a;box-shadow:0 0 10px #33e07a;animation:pulse 1.8s infinite}
.ai-badge.off .dot{background:#ffb020;box-shadow:0 0 10px #ffb020}
@keyframes pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.45;transform:scale(.8)}}
.ai-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.ai-card{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.14);border-radius:16px;padding:26px 22px;transition:.28s;backdrop-filter:blur(6px)}
.ai-card:hover{transform:translateY(-6px);border-color:rgba(230,0,18,.75);background:rgba(230,0,18,.12);box-shadow:0 16px 40px rgba(0,0,0,.35)}
.ai-card .ico{width:46px;height:46px;border-radius:13px;background:linear-gradient(135deg,#e60012,#8f000b);display:flex;align-items:center;justify-content:center;font-size:22px;margin-bottom:16px}
.ai-card h4{font-size:17px;margin-bottom:9px}
.ai-card p{font-size:13.5px;color:rgba(255,255,255,.68);line-height:1.75}
.ai-card .go{margin-top:14px;display:inline-flex;align-items:center;gap:6px;color:#ff8a94;font-size:13.5px;cursor:pointer;background:none;border:none;padding:0}
.ai-card .go:hover{color:#fff}
.ai-metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:38px;padding-top:30px;border-top:1px solid rgba(255,255,255,.12)}
.ai-metric{text-align:center}
.ai-metric b{font-size:28px;display:block;color:#fff}
.ai-metric b small{font-size:15px}
.ai-metric span{font-size:13px;color:rgba(255,255,255,.6)}

/* ===== AI 需求诊断 ===== */
.diag-wrap{display:grid;grid-template-columns:1fr 1.15fr;gap:26px;margin-top:34px}
.diag-form{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.14);border-radius:16px;padding:26px}
.diag-form h4{font-size:17px;margin-bottom:6px}
.diag-form .tip{font-size:12.5px;color:rgba(255,255,255,.55);margin-bottom:18px}
.diag-field{margin-bottom:16px}
.diag-field label{display:block;font-size:13px;color:rgba(255,255,255,.75);margin-bottom:7px}
.diag-field select,.diag-field input{width:100%;height:42px;padding:0 12px;border-radius:9px;border:1px solid rgba(255,255,255,.2);background:rgba(0,0,0,.28);color:#fff;font-size:14px;font-family:inherit;outline:none;box-sizing:border-box}
.diag-field select option{background:#222;color:#fff}
.diag-field input::placeholder{color:rgba(255,255,255,.35)}
.diag-field select:focus,.diag-field input:focus{border-color:var(--red)}
.diag-chips{display:flex;flex-wrap:wrap;gap:8px}
.diag-chips span{font-size:13px;padding:6px 13px;border-radius:999px;border:1px solid rgba(255,255,255,.22);cursor:pointer;transition:.2s;color:rgba(255,255,255,.8)}
.diag-chips span.on{background:var(--red);border-color:var(--red);color:#fff}
.diag-out{background:rgba(0,0,0,.32);border:1px solid rgba(255,255,255,.14);border-radius:16px;padding:24px;min-height:280px;display:flex;flex-direction:column}
.diag-out .hd{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px;font-size:13.5px;color:rgba(255,255,255,.7)}
.diag-out .hd button{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.2);color:#fff;border-radius:8px;padding:6px 14px;font-size:13px;cursor:pointer}
.diag-out .hd button:hover{background:var(--red);border-color:var(--red)}
.diag-body{font-size:13.8px;line-height:1.9;color:rgba(255,255,255,.9);white-space:pre-wrap;flex:1;overflow-y:auto;max-height:420px}
.diag-body strong{color:#ffb3b9}
.diag-empty{color:rgba(255,255,255,.4);font-size:13.5px;text-align:center;margin:auto;padding:30px 10px;line-height:2}

/* ===== AI 悬浮助手 ===== */
.ai-fab{position:fixed;right:22px;bottom:150px;z-index:1200;width:60px;height:60px;border-radius:50%;border:none;cursor:pointer;
  background:linear-gradient(135deg,#e60012,#8f000b);color:#fff;font-size:12px;font-weight:700;line-height:1.25;
  box-shadow:0 8px 26px rgba(230,0,18,.45);display:flex;flex-direction:column;align-items:center;justify-content:center;
  transition:.25s;font-family:inherit;animation:fabIn .5s ease}
.ai-fab:hover{transform:scale(1.07)}
.ai-fab .ping{position:absolute;inset:0;border-radius:50%;border:2px solid rgba(230,0,18,.6);animation:ping 2s infinite}
@keyframes ping{0%{transform:scale(1);opacity:.9}100%{transform:scale(1.5);opacity:0}}
@keyframes fabIn{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:none}}

.ai-panel{position:fixed;right:22px;bottom:22px;z-index:1201;width:392px;height:640px;max-height:calc(100vh - 44px);
  background:#fff;border-radius:18px;box-shadow:0 24px 70px rgba(0,0,0,.28);display:none;flex-direction:column;overflow:hidden}
.ai-panel.open{display:flex;animation:fabIn .3s ease}
.ai-head{background:linear-gradient(135deg,#8f000b,#e60012);color:#fff;padding:15px 18px;display:flex;align-items:center;gap:11px;flex-shrink:0}
.ai-head .av{width:38px;height:38px;border-radius:11px;background:rgba(255,255,255,.2);display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:800}
.ai-head .nm{font-size:15.5px;font-weight:700}
.ai-head .st{font-size:11.5px;opacity:.85;display:flex;align-items:center;gap:5px}
.ai-head .st i{width:6px;height:6px;border-radius:50%;background:#33e07a;display:inline-block}
.ai-head .st.off i{background:#ffb020}
.ai-head .x{margin-left:auto;background:none;border:none;color:#fff;font-size:22px;cursor:pointer;line-height:1;opacity:.85;padding:4px}
.ai-head .x:hover{opacity:1}

.ai-msgs{flex:1;overflow-y:auto;padding:18px;background:#f7f7f8;-webkit-overflow-scrolling:touch;overscroll-behavior:contain}
.ai-msg{display:flex;gap:9px;margin-bottom:16px;align-items:flex-start}
.ai-msg .av{width:30px;height:30px;border-radius:9px;flex-shrink:0;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;color:#fff;background:linear-gradient(135deg,#e60012,#b8000e)}
.ai-msg .bub{background:#fff;border-radius:3px 13px 13px 13px;padding:11px 14px;font-size:14px;line-height:1.78;box-shadow:0 2px 8px rgba(0,0,0,.06);max-width:290px;word-break:break-word;white-space:pre-wrap;color:var(--ink)}
.ai-msg.me{flex-direction:row-reverse}
.ai-msg.me .av{background:#4a4a4a}
.ai-msg.me .bub{background:var(--red);color:#fff;border-radius:13px 3px 13px 13px}
.ai-msg .bub b{color:var(--red-deep)}
.ai-msg.me .bub b{color:#ffe2e5}
.ai-typing{display:inline-flex;gap:4px;padding:3px 0}
.ai-typing i{width:6px;height:6px;border-radius:50%;background:#c9c9c9;animation:blink 1.2s infinite}
.ai-typing i:nth-child(2){animation-delay:.2s}
.ai-typing i:nth-child(3){animation-delay:.4s}
@keyframes blink{0%,60%,100%{opacity:.3;transform:translateY(0)}30%{opacity:1;transform:translateY(-3px)}}
.ai-thinking{color:#999;font-size:13px;display:inline-block}
.ai-thinking::after{content:"";display:inline-block;width:6px;height:6px;margin-left:7px;border-radius:50%;background:var(--red);animation:pulse 1.2s infinite;vertical-align:middle}
.ai-quick{display:flex;gap:8px;flex-wrap:wrap;padding:0 18px 12px;background:#f7f7f8}
.ai-quick button{font-size:12.5px;padding:7px 13px;border-radius:999px;border:1px solid #e2e2e2;background:#fff;color:#555;cursor:pointer;transition:.2s;font-family:inherit}
.ai-quick button:hover{border-color:var(--red);color:var(--red);background:#fdecec}
.ai-acts{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}
.ai-acts a{font-size:12.5px;padding:7px 14px;border-radius:8px;background:var(--red);color:#fff;text-decoration:none}
.ai-acts a.ghost{background:#fff;color:var(--red);border:1px solid var(--red)}
.ai-acts .ai-chip{font-size:12.5px;padding:7px 13px;border-radius:999px;border:1px solid #f0c9cc;background:#fdecec;color:var(--red-deep);cursor:pointer;font-family:inherit;transition:.2s}
.ai-acts .ai-chip:hover{background:var(--red);color:#fff;border-color:var(--red)}
.ai-input{border-top:1px solid #ececec;padding:11px 13px;display:flex;gap:9px;align-items:flex-end;background:#fff;flex-shrink:0}
.ai-input textarea{flex:1;border:1px solid #e6e6e6;border-radius:11px;padding:10px 12px;font-size:14px;font-family:inherit;resize:none;outline:none;max-height:92px;min-height:42px;line-height:1.5;box-sizing:border-box;background:#fafafa}
.ai-input textarea:focus{border-color:var(--red);background:#fff}
.ai-send{width:42px;height:42px;border-radius:11px;border:none;background:var(--red);color:#fff;font-size:17px;cursor:pointer;flex-shrink:0;transition:.2s}
.ai-send:hover{background:var(--red-dark)}
.ai-send:disabled{background:#d5d5d5;cursor:not-allowed}
.ai-stop{width:42px;height:42px;border-radius:11px;border:1px solid #e2e2e2;background:#fff;color:#666;font-size:13px;cursor:pointer;flex-shrink:0;transition:.2s;font-family:inherit}
.ai-stop:hover{border-color:var(--red);color:var(--red);background:#fdecec}
.ai-stop[hidden]{display:none}
.diag-out .hd button:disabled{opacity:.6;cursor:not-allowed}
.ai-disclaim{font-size:11px;color:#aaa;text-align:center;padding:0 18px 9px;background:#fff}

@media(max-width:960px){
  .ai-grid{grid-template-columns:repeat(2,1fr)}
  .ai-metrics{grid-template-columns:repeat(2,1fr);gap:20px}
  .diag-wrap{grid-template-columns:1fr}
}
@media(max-width:640px){
  .ai-grid{grid-template-columns:1fr}
  .ai-panel{right:0;bottom:0;left:0;top:0;width:100%;height:100%;height:100dvh;max-height:none;border-radius:0}
  .ai-fab{right:16px;bottom:132px;width:56px;height:56px}
  .ai-msg .bub{max-width:78vw}
  .diag-out .hd{flex-direction:column;align-items:flex-start;gap:8px}
}
/* 微信内置浏览器（X5/WKWebView）适配 */
.wechat .ai-fab{bottom:140px}
.wechat .ai-panel{bottom:0}