:root{
  --brand:#4f7cff;
  --brand2:#7b5cff;
  --ink:#1b2233;
  --muted:#8b94a8;
  --line:#e9edf6;
  --bg:#f3f6fd;
  --card:#fff;
  --ok:#22c55e;
  --warn:#f59e0b;
  --busy:#ef4444;
  --off:#9aa3b5;
  --shadow:0 24px 70px rgba(31,45,90,.18);
}
*{margin:0;padding:0;box-sizing:border-box}
html,body{height:100%}
body{
  font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;
  color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased;
}

/* ============ 演示页 ============ */
.page{min-height:100%;display:flex;flex-direction:column}
.nav{
  height:64px;display:flex;align-items:center;justify-content:space-between;
  padding:0 40px;background:rgba(255,255,255,.78);backdrop-filter:blur(14px);
  position:sticky;top:0;z-index:20;border-bottom:1px solid rgba(233,237,246,.9);
}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:17px}
.brand-dot{width:12px;height:12px;border-radius:50%;background:linear-gradient(135deg,var(--brand),var(--brand2));box-shadow:0 0 0 5px rgba(79,124,255,.14)}
.nav-links{display:flex;gap:8px}
.nav-links a{
  text-decoration:none;color:var(--muted);font-size:14px;padding:8px 16px;border-radius:999px;transition:.2s
}
.nav-links a:hover{color:var(--brand);background:rgba(79,124,255,.08)}
.nav-links a.active{color:#fff;background:linear-gradient(135deg,var(--brand),var(--brand2));box-shadow:0 8px 20px rgba(79,124,255,.32)}

.hero{
  flex:1;display:grid;grid-template-columns:1.05fr .95fr;gap:60px;align-items:center;
  max-width:1180px;width:100%;margin:0 auto;padding:70px 40px 120px;
}
.hero-text h1{font-size:52px;line-height:1.18;letter-spacing:-1px;font-weight:800}
.hero-text h1 span{background:linear-gradient(135deg,var(--brand),var(--brand2));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-text p{margin-top:20px;color:var(--muted);font-size:17px;line-height:1.9;max-width:480px}
.hero-actions{margin-top:34px;display:flex;gap:14px;flex-wrap:wrap}
.btn-primary{
  border:0;cursor:pointer;color:#fff;font-size:15px;font-weight:600;padding:14px 34px;border-radius:999px;
  background:linear-gradient(135deg,var(--brand),var(--brand2));box-shadow:0 14px 32px rgba(79,124,255,.34);transition:.22s
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 18px 40px rgba(79,124,255,.42)}
.btn-ghost{
  display:inline-flex;align-items:center;text-decoration:none;color:var(--ink);font-size:15px;font-weight:600;
  padding:14px 30px;border-radius:999px;background:#fff;border:1px solid var(--line);transition:.2s
}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand)}
.hero-points{margin-top:34px;display:flex;gap:22px;list-style:none;flex-wrap:wrap}
.hero-points li{font-size:13.5px;color:var(--muted);display:flex;align-items:center;gap:8px}
.hero-points li::before{content:'';width:7px;height:7px;border-radius:50%;background:linear-gradient(135deg,var(--brand),var(--brand2))}

.hero-card{
  background:#fff;border-radius:26px;padding:30px;box-shadow:var(--shadow);
  display:flex;flex-direction:column;gap:16px;border:1px solid rgba(233,237,246,.9)
}
.mini-bubble{max-width:78%;padding:13px 18px;border-radius:16px;font-size:14px;line-height:1.7}
.mini-bubble.left{align-self:flex-start;background:#f2f5fd;border-top-left-radius:5px}
.mini-bubble.right{align-self:flex-end;color:#fff;background:linear-gradient(135deg,var(--brand),var(--brand2));border-top-right-radius:5px}

/* ============ 悬浮按钮 ============ */
.launcher{
  position:fixed;right:30px;bottom:30px;width:62px;height:62px;border:0;border-radius:50%;cursor:pointer;z-index:60;
  background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;font-size:26px;
  box-shadow:0 16px 38px rgba(79,124,255,.45);transition:.25s;display:flex;align-items:center;justify-content:center
}
.launcher:hover{transform:scale(1.07) translateY(-2px)}
.launcher.hidden{transform:scale(0);opacity:0;pointer-events:none}
.launcher-badge{
  position:absolute;top:-4px;right:-4px;min-width:20px;height:20px;border-radius:999px;background:#ef4444;
  font-size:12px;line-height:20px;color:#fff;padding:0 5px;box-shadow:0 4px 10px rgba(239,68,68,.5)
}

/* ============ 聊天窗口 ============ */
.chat-box{
  position:fixed;right:30px;bottom:30px;width:390px;height:620px;max-height:calc(100vh - 60px);
  background:var(--card);border-radius:22px;box-shadow:var(--shadow);z-index:70;
  display:flex;flex-direction:column;overflow:hidden;border:1px solid rgba(233,237,246,.9);
  opacity:0;transform:translateY(26px) scale(.96);pointer-events:none;transition:.28s cubic-bezier(.2,.8,.3,1)
}
.chat-box.open{opacity:1;transform:none;pointer-events:auto}

.chat-head{
  display:flex;align-items:center;gap:12px;padding:16px 18px;color:#fff;
  background:linear-gradient(135deg,var(--brand),var(--brand2));position:relative
}
.chat-head .avatar{
  width:42px;height:42px;border-radius:14px;background:rgba(255,255,255,.22);
  display:flex;align-items:center;justify-content:center;font-weight:700;font-size:16px;backdrop-filter:blur(6px)
}
.chat-head .avatar.avatar-no-bg{background:transparent!important;border-radius:0!important;backdrop-filter:none!important;box-shadow:none!important}
.head-meta{flex:1;min-width:0}
.head-name{font-size:15px;font-weight:600}
.head-status{display:flex;align-items:center;gap:6px;font-size:12px;opacity:.92;margin-top:3px}
.head-status .dot{width:7px;height:7px;border-radius:50%;background:var(--ok);box-shadow:0 0 0 3px rgba(255,255,255,.28)}
.head-status.is-away .dot{background:var(--warn)}
.head-status.is-busy .dot{background:var(--busy)}
.head-status.is-offline .dot{background:var(--off)}
.icon-btn{
  width:32px;height:32px;border:0;border-radius:10px;cursor:pointer;color:#fff;font-size:16px;
  background:rgba(255,255,255,.16);transition:.2s;line-height:1
}
.icon-btn:hover{background:rgba(255,255,255,.3)}

.chat-body{flex:1;overflow:hidden;background:#f7f9fe}
.msg-list{height:100%;overflow-y:auto;padding:20px 18px 10px;display:flex;flex-direction:column;gap:14px;scroll-behavior:smooth}
.msg-list::-webkit-scrollbar{width:6px}
.msg-list::-webkit-scrollbar-thumb{background:#d8dfef;border-radius:3px}

.msg{display:flex;flex-direction:column;max-width:82%;animation:pop .25s ease}
@keyframes pop{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.msg.you{align-self:flex-start;align-items:flex-start}
.msg.me{align-self:flex-end;align-items:flex-end}
.bubble{
  padding:11px 15px;font-size:14px;line-height:1.75;border-radius:16px;word-break:break-word;white-space:pre-wrap
}
.msg.you .bubble{background:#fff;border-top-left-radius:5px;box-shadow:0 3px 12px rgba(31,45,90,.06)}
.msg.me .bubble{color:#fff;background:linear-gradient(135deg,var(--brand),var(--brand2));border-top-right-radius:5px;box-shadow:0 6px 16px rgba(79,124,255,.26)}
.msg-img{max-width:210px;max-height:210px;border-radius:14px;display:block;cursor:zoom-in;box-shadow:0 6px 18px rgba(31,45,90,.14)}
.msg-time{font-size:11px;color:#a9b1c3;margin-top:5px;padding:0 4px}
.read-status{font-size:11px;color:#a9b1c3;margin-top:5px;margin-left:6px}
.read-status.read{color:#22c55e}
.typing-tip{display:flex;gap:4px;padding:8px 14px;background:#fff;border-radius:14px;align-self:flex-start;box-shadow:0 3px 12px rgba(31,45,90,.06)}
.typing-dot{width:6px;height:6px;border-radius:50%;background:#a9b1c3;animation:kf-typing 1.2s infinite ease-in-out}
.typing-dot:nth-child(2){animation-delay:.2s}
.typing-dot:nth-child(3){animation-delay:.4s}
@keyframes kf-typing{0%,60%,100%{transform:translateY(0);opacity:.5}30%{transform:translateY(-4px);opacity:1}}

.quick-faq{display:flex;gap:8px;padding:10px 16px;overflow-x:auto;background:#fff;border-top:1px solid var(--line)}
.quick-faq:empty{display:none}
.quick-faq button{
  flex:0 0 auto;border:1px solid var(--line);background:#f7f9fe;color:#4a5568;font-size:12.5px;
  padding:7px 14px;border-radius:999px;cursor:pointer;transition:.2s;white-space:nowrap
}
.quick-faq button:hover{border-color:var(--brand);color:var(--brand);background:rgba(79,124,255,.07)}

.emoji-panel{
  display:grid;grid-template-columns:repeat(8,1fr);gap:4px;padding:12px;max-height:172px;overflow-y:auto;
  background:#fff;border-top:1px solid var(--line)
}
.emoji-panel button{border:0;background:transparent;font-size:20px;cursor:pointer;border-radius:9px;padding:5px;transition:.15s}
.emoji-panel button:hover{background:#eef2fd;transform:scale(1.16)}
.emoji-panel[hidden]{display:none}
.emoji-panel[hidden]{display:none}

.chat-foot{background:#fff;border-top:1px solid var(--line);padding:10px 12px 12px}
.chat-foot .tools{display:flex;gap:4px;margin-bottom:6px}
.tool-btn{
  border:0;background:transparent;font-size:18px;cursor:pointer;padding:4px 8px;border-radius:9px;transition:.2s;line-height:1
}
.tool-btn:hover{background:#eef2fd}
.chat-foot textarea{
  width:100%;border:0;outline:0;resize:none;font-size:14px;line-height:1.6;font-family:inherit;
  max-height:96px;padding:6px 2px;color:var(--ink)
}
.send-btn{
  float:right;border:0;cursor:pointer;color:#fff;font-size:14px;font-weight:600;padding:9px 24px;border-radius:999px;
  background:linear-gradient(135deg,var(--brand),var(--brand2));box-shadow:0 8px 18px rgba(79,124,255,.3);transition:.2s
}
.send-btn:hover{transform:translateY(-1px)}
.send-btn:disabled{opacity:.55;cursor:not-allowed;transform:none}

.sys-tip{text-align:center;font-size:12px;color:#a9b1c3;padding:4px 0}

/* ============ 订单号栏 ============ */
.order-bar{display:flex;align-items:center;gap:8px;padding:8px 14px;background:#fff;border-top:1px solid var(--line)}
.order-bar[hidden]{display:none}
.order-bar .order-icon{font-size:15px;line-height:1}
.order-bar input{flex:1;border:1px solid var(--line);border-radius:9px;padding:7px 10px;font-size:13px;font-family:inherit;outline:0;transition:.2s}
.order-bar input:focus{border-color:var(--brand);box-shadow:0 0 0 3px rgba(79,124,255,.12)}
.order-clear{border:0;background:transparent;color:#a9b1c3;cursor:pointer;font-size:13px;padding:2px 4px;border-radius:6px}
.order-clear:hover{color:#ef4444;background:#fdf0f0}
.order-tag{display:inline-block;font-size:11px;color:var(--brand);background:rgba(79,124,255,.1);padding:1px 6px;border-radius:6px;margin-bottom:3px}

/* ============ 窗口抖动（关键帧由 chat.js 按后台设置动态注入） ============ */
.sys-shake{text-align:center;font-size:12.5px;color:#ef4444;background:#fef2f2;border:1px solid #fde3e3;border-radius:10px;padding:8px 12px;margin:4px auto}

@media (max-width:820px){
  .hero{grid-template-columns:1fr;gap:36px;padding:44px 22px 120px}
  .hero-text h1{font-size:34px}
  .hero-card{display:none}
  .nav{padding:0 18px}
  .chat-box{right:12px;left:12px;bottom:12px;width:auto;height:calc(100vh - 24px);max-height:none}
  .launcher{right:18px;bottom:18px}
}