*{margin:0;padding:0;box-sizing:border-box}
html,body{height:100%}
:root{
  --bg:#f7f6f3;--panel:#ffffff;--panel-alt:#fbfaf7;
  --border:#ebe8e1;--border-strong:#ddd9d0;
  --text:#2c2a26;--text-soft:#7a756b;--text-dim:#a8a49b;
  --accent:#1f1d1a;--user-bubble:#f0ede6;--echo-accent:#5a5348;
  --shadow:0 1px 2px rgba(60,55,45,.04),0 8px 24px rgba(60,55,45,.06);
}
body.dark{
  --bg:#141312;--panel:#1c1b19;--panel-alt:#232120;
  --border:#2e2c29;--border-strong:#3a3833;
  --text:#e6e2da;--text-soft:#9a958b;--text-dim:#6a6560;
  --accent:#e6e2da;--user-bubble:#252320;--echo-accent:#c4bfb6;
  --shadow:0 1px 2px rgba(0,0,0,.3),0 8px 24px rgba(0,0,0,.4);
}
body{font-family:-apple-system,BlinkMacSystemFont,"SF Pro Text","Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--text);overflow:hidden;transition:background .8s ease,color .8s ease;-webkit-font-smoothing:antialiased}
.hidden{display:none !important}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit;font-size:inherit}
input,textarea{font-family:inherit;color:inherit}

/* 落地页 */
#landing{position:fixed;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;background:var(--bg);padding:0 24px}
.landing-brand{display:flex;flex-direction:column;align-items:center;gap:8px}
.logo{font-family:"Iowan Old Style",Georgia,"Songti SC","STSong",serif;font-size:clamp(52px,8vw,88px);letter-spacing:.28em;color:var(--text);font-weight:400;line-height:1;text-indent:.28em}
.logo-sub{color:var(--text-soft);letter-spacing:.32em;font-size:.82em;margin-top:6px;text-indent:.32em}
.landing-divider{width:36px;height:1px;background:var(--border-strong);margin:38px 0 30px;opacity:.7}
.cta{padding:13px 44px;background:var(--accent);color:var(--bg);border-radius:999px;letter-spacing:.14em;font-size:.85em;font-weight:500;transition:transform .25s,opacity .25s;box-shadow:0 2px 8px rgba(0,0,0,.08)}
.cta:hover{transform:translateY(-1px);opacity:.92}
.cta-note{margin-top:16px;color:var(--text-dim);font-size:.75em;letter-spacing:.12em}
#lastLoginHint{margin-top:28px;color:var(--text-dim);font-size:.72em;letter-spacing:.14em;opacity:0;transition:opacity 1.5s}
#lastLoginHint.on{opacity:1}

/* 注册 */
#signup{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;background:var(--bg);padding:20px}
.signup-card{width:100%;max-width:420px;padding:44px 40px 40px;background:var(--panel);border-radius:16px;box-shadow:var(--shadow)}
.signup-card h2{font-family:"Iowan Old Style",Georgia,"Songti SC","STSong",serif;font-weight:400;font-size:24px;letter-spacing:.08em;margin-bottom:6px;color:var(--text)}
.signup-card .sub{color:var(--text-soft);font-size:.82em;margin-bottom:32px;letter-spacing:.04em}
.field{margin-bottom:18px}
.field label{display:block;font-size:.72em;color:var(--text-soft);margin-bottom:7px;letter-spacing:.14em;text-transform:uppercase;font-weight:500}
.field label .opt{color:var(--text-dim);font-size:.9em;text-transform:none;margin-left:4px;font-weight:400}
.field input{width:100%;padding:12px 0;border:none;border-bottom:1px solid var(--border);border-radius:0;font-size:.95em;color:var(--text);outline:none;background:transparent;transition:border-color .3s;letter-spacing:.02em}
.field input:focus{border-bottom-color:var(--accent)}
.field input::placeholder{color:var(--text-dim)}
.agree{display:flex;align-items:flex-start;gap:10px;margin-top:28px;font-size:.78em;color:var(--text-soft);line-height:1.6}
.agree input{margin-top:2px;accent-color:var(--accent);width:14px;height:14px}
.agree a{color:var(--text);text-decoration:underline;text-underline-offset:3px;text-decoration-color:var(--border-strong);cursor:pointer}
.signup-btn{width:100%;margin-top:28px;padding:14px;background:var(--accent);color:var(--bg);border-radius:999px;letter-spacing:.14em;font-size:.85em;font-weight:500;transition:opacity .3s,transform .2s}
.signup-btn:hover:not(:disabled){transform:translateY(-1px)}
.signup-btn:disabled{opacity:.25;cursor:not-allowed}

/* 条款 */
#terms{position:fixed;inset:0;background:rgba(20,18,15,.5);z-index:20;display:flex;align-items:center;justify-content:center;padding:20px;backdrop-filter:blur(6px)}
.terms-card{max-width:560px;width:100%;max-height:82vh;overflow-y:auto;background:var(--panel);border-radius:16px;padding:40px 38px 32px;font-size:.88em;line-height:1.9;color:var(--text-soft);box-shadow:0 24px 60px rgba(0,0,0,.2)}
.terms-card h3{font-family:"Iowan Old Style",Georgia,"Songti SC","STSong",serif;font-weight:400;font-size:20px;letter-spacing:.1em;margin-bottom:24px;color:var(--text)}
.terms-card .clause{margin-bottom:18px;padding-left:16px;border-left:1px solid var(--border)}
.terms-card .clause .num{color:var(--text);letter-spacing:.06em;font-size:.95em;margin-bottom:4px}
.terms-card .clause .content{color:var(--text-soft)}
.terms-card .clause.special .content{color:var(--text)}
.terms-card .clause.special{border-left-color:var(--text)}
.terms-close{display:block;width:100%;margin-top:28px;padding:13px;background:var(--accent);color:var(--bg);border-radius:999px;letter-spacing:.14em;font-size:.82em;font-weight:500}

/* 主应用 */
#main{position:fixed;inset:0;display:flex;flex-direction:column;background:var(--bg)}
.main-header{height:56px;border-bottom:1px solid var(--border);display:flex;align-items:center;padding:0 26px;justify-content:space-between;background:var(--panel);flex-shrink:0}
.brand{font-family:"Iowan Old Style",Georgia,"Songti SC","STSong",serif;font-size:15px;letter-spacing:.3em;color:var(--text);font-weight:500;text-indent:.3em}
.user-tag{font-size:.76em;color:var(--text-soft);letter-spacing:.12em;display:flex;align-items:center;gap:8px}
.user-tag::before{content:'';display:inline-block;width:6px;height:6px;border-radius:50%;background:#7a9c7e;box-shadow:0 0 6px rgba(122,156,126,.6)}

.main-body{flex:1;display:flex;min-height:0}
.records-panel{width:260px;border-right:1px solid var(--border);background:var(--panel-alt);display:flex;flex-direction:column;flex-shrink:0}
.records-panel .panel-title{padding:20px 24px 12px;font-size:.68em;color:var(--text-dim);letter-spacing:.2em;text-transform:uppercase;font-weight:500}
.records-list{flex:1;overflow-y:auto;padding:0 12px 24px}
.records-list::-webkit-scrollbar{width:0}
.record-item{padding:9px 12px;font-size:.82em;color:var(--text-soft);border-radius:6px;margin-bottom:1px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;transition:background .25s,color .8s;line-height:1.5}
.record-item:hover{background:var(--user-bubble)}
.record-item.strange{color:var(--text-dim);font-style:italic}
.record-item.ghost{color:var(--text-dim);opacity:.6;font-style:italic}
.record-item.fresh{animation:recordIn .8s ease-out}
@keyframes recordIn{from{opacity:0;transform:translateX(-6px)}to{opacity:1;transform:translateX(0)}}

.conversation{flex:1;display:flex;flex-direction:column;min-width:0}
.conv-area{flex:1;overflow-y:auto;padding:36px 8% 20px}
.conv-area::-webkit-scrollbar{width:6px}
.conv-area::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}
.conv-inner{max-width:620px;margin:0 auto;display:flex;flex-direction:column;gap:22px}

.msg{font-size:.94em;line-height:1.75;letter-spacing:.01em;animation:msgIn .5s;color:var(--text)}
@keyframes msgIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}
.msg.user{color:var(--text);padding:10px 16px;background:var(--user-bubble);border-radius:14px;align-self:flex-end;max-width:75%;font-size:.9em}
.msg.echo{color:var(--text);padding-left:16px;border-left:2px solid var(--echo-accent);white-space:pre-line}
.msg.echo.soft{color:var(--text-soft);border-left-color:var(--border-strong)}
.msg.echo.whisper{color:var(--text-dim);border-left-color:var(--border);font-style:italic;font-size:.9em}
.msg.echo.burst{color:var(--text);border-left-color:var(--accent);font-size:1em}

.input-area{border-top:1px solid var(--border);padding:18px 8% 22px;background:var(--panel);flex-shrink:0}
.input-inner{max-width:620px;margin:0 auto;display:flex;align-items:flex-end;gap:12px;padding:12px 16px;background:var(--bg);border-radius:14px}
#userInput{flex:1;border:none;outline:none;font-size:.94em;color:var(--text);padding:4px 0;resize:none;line-height:1.6;max-height:120px;background:transparent;caret-color:var(--accent)}
#userInput::placeholder{color:var(--text-dim)}
.send-btn{padding:8px 18px;background:var(--accent);color:var(--bg);border-radius:999px;font-size:.78em;letter-spacing:.1em;flex-shrink:0;font-weight:500;transition:opacity .2s,transform .2s}
.send-btn:disabled{opacity:.2;cursor:not-allowed}

.permission-panel{max-width:560px;padding:20px 24px;background:var(--panel);border:1px solid var(--border);border-radius:14px;font-size:.85em;line-height:1.8;color:var(--text-soft);animation:msgIn .6s}
.permission-panel .perm-title{font-size:.82em;color:var(--text-dim);letter-spacing:.15em;text-transform:uppercase;margin-bottom:14px;font-weight:500}
.permission-panel .perm-row{display:flex;justify-content:space-between;align-items:center;padding:9px 0;border-bottom:1px solid var(--border)}
.permission-panel .perm-row:last-child{border-bottom:none}
.permission-panel .perm-row .val{color:var(--text-soft);font-size:.85em;letter-spacing:.05em;transition:color .5s}
.permission-panel .perm-row .val.granted{color:#7a9c7e}
.permission-panel .perm-row .val.request{color:var(--text);text-decoration:underline;text-underline-offset:3px;text-decoration-color:var(--border-strong);cursor:pointer}
.permission-panel .perm-row .val.denied{color:var(--text-dim)}

.location-card{max-width:560px;background:var(--panel);border:1px solid var(--border);border-radius:14px;overflow:hidden;animation:msgIn .6s}
.location-card .loc-header{padding:14px 18px;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--border);font-size:.85em;color:var(--text-soft);letter-spacing:.05em}
.location-card .loc-header .coord{color:var(--text-dim);font-size:.82em;font-family:ui-monospace,Menlo,Consolas,monospace}
.location-card .loc-map{height:240px;background:#0a0a0a;position:relative;overflow:hidden}
.location-card .loc-map svg{width:100%;height:100%;display:block}
.location-card .loc-address{padding:14px 18px;font-size:.85em;color:var(--text);letter-spacing:.02em;line-height:1.6;border-top:1px solid var(--border)}
.location-card .loc-address .label{color:var(--text-dim);font-size:.82em;letter-spacing:.1em;text-transform:uppercase;margin-bottom:6px}

.camera-card{max-width:480px;background:#0a0a0a;border:1px solid var(--border);border-radius:14px;overflow:hidden;animation:msgIn .6s;position:relative}
.camera-card video{width:100%;display:block;transform:scaleX(-1);filter:grayscale(1) contrast(1.35) brightness(.85);transition:filter 2s,transform 2s}
.camera-card .cam-label{position:absolute;left:10px;top:10px;color:#e26b6b;font-size:.72em;letter-spacing:.15em;font-family:ui-monospace,Menlo,Consolas,monospace;display:flex;align-items:center;gap:6px;z-index:3}
.camera-card .cam-label::before{content:'';width:6px;height:6px;border-radius:50%;background:#e26b6b;box-shadow:0 0 8px #e26b6b;animation:liveBlink 1.2s steps(2) infinite}
@keyframes liveBlink{0%,100%{opacity:1}50%{opacity:.15}}
.camera-card .cam-target{position:absolute;left:35%;top:25%;width:30%;height:50%;border:1px solid rgba(180,255,200,.5);z-index:2;pointer-events:none;animation:targetTrack 6s ease-in-out infinite}
@keyframes targetTrack{0%,100%{transform:translate(0,0)}25%{transform:translate(-2%,1%)}50%{transform:translate(2%,-1%)}75%{transform:translate(-1%,-2%)}}

.sys-notif{position:fixed;right:24px;bottom:24px;width:340px;background:rgba(20,18,15,.94);color:#e8e4dc;border:1px solid rgba(255,255,255,.06);border-radius:12px;padding:15px 18px 15px 15px;z-index:9999;box-shadow:0 12px 40px rgba(0,0,0,.35);opacity:0;transform:translateX(70px);transition:opacity .4s,transform .4s;display:flex;gap:13px;align-items:flex-start;font-size:.82em;line-height:1.5;backdrop-filter:blur(12px)}
.sys-notif.on{opacity:1;transform:translateX(0)}
.sys-notif .notif-icon{width:34px;height:34px;flex-shrink:0;border-radius:8px;background:linear-gradient(135deg,#5a5348,#3a3630);display:flex;align-items:center;justify-content:center;color:#fff;font-size:.95em;font-weight:500;font-family:"Iowan Old Style",Georgia,serif}
.sys-notif.imposter .notif-icon{background:#07c160;font-family:inherit;font-weight:400}
.sys-notif .notif-body{flex:1;min-width:0}
.sys-notif .notif-title{color:#fff;font-size:.9em;margin-bottom:3px;display:flex;justify-content:space-between}
.sys-notif .notif-title .time{color:#7a7a7a;font-size:.82em}
.sys-notif .notif-content{color:#b8b4ac}
.sys-notif .notif-close{position:absolute;right:10px;top:10px;width:18px;height:18px;cursor:pointer;color:#666;display:flex;align-items:center;justify-content:center;border-radius:50%;font-size:.85em}
.sys-notif .notif-close:hover{background:rgba(255,255,255,.1);color:#e8e8e8}

.fake-wechat{position:fixed;right:24px;bottom:24px;width:380px;background:rgba(28,26,22,.98);border:1px solid rgba(255,255,255,.08);border-radius:14px;z-index:9998;box-shadow:0 20px 60px rgba(0,0,0,.5);opacity:0;transform:translateY(20px);transition:opacity .4s,transform .4s;overflow:hidden}
.fake-wechat.on{opacity:1;transform:translateY(0)}
.fake-wechat .wx-header{padding:12px 16px;border-bottom:1px solid rgba(255,255,255,.06);display:flex;align-items:center;gap:10px;color:#e8e4dc;font-size:.85em}
.fake-wechat .wx-avatar{width:28px;height:28px;border-radius:6px;background:#07c160;display:flex;align-items:center;justify-content:center;color:#fff;font-size:.8em;font-weight:500}
.fake-wechat .wx-body{padding:16px;font-size:.85em;color:#e8e4dc;line-height:1.6;max-height:240px;overflow-y:auto}
.fake-wechat .wx-msg{margin-bottom:12px;display:flex;gap:8px;align-items:flex-start}
.fake-wechat .wx-msg .who{flex-shrink:0;width:28px;height:28px;border-radius:6px;background:#3a3833;color:#b8b4ac;display:flex;align-items:center;justify-content:center;font-size:.75em}
.fake-wechat .wx-msg.self{flex-direction:row-reverse}
.fake-wechat .wx-msg.self .who{background:#07c160;color:#fff}
.fake-wechat .wx-msg .bubble{background:#2a2822;padding:8px 12px;border-radius:8px;max-width:70%;word-break:break-word}
.fake-wechat .wx-msg.self .bubble{background:#07c160;color:#fff}
.fake-wechat .wx-close{position:absolute;right:10px;top:10px;width:20px;height:20px;border-radius:50%;color:#7a7a7a;font-size:.85em;display:flex;align-items:center;justify-content:center;cursor:pointer}
.fake-wechat .wx-close:hover{background:rgba(255,255,255,.1);color:#fff}

.download-toast{position:fixed;left:50%;top:20px;transform:translateX(-50%) translateY(-80px);background:rgba(20,18,15,.95);color:#e8e4dc;padding:10px 18px;border-radius:999px;font-size:.82em;letter-spacing:.05em;box-shadow:0 8px 30px rgba(0,0,0,.35);z-index:9997;opacity:0;transition:opacity .3s,transform .3s;pointer-events:none;display:flex;align-items:center;gap:10px}
.download-toast.on{opacity:1;transform:translateX(-50%) translateY(0)}
.download-toast .dot{width:6px;height:6px;border-radius:50%;background:#e26b6b;box-shadow:0 0 8px #e26b6b;animation:liveBlink 1s steps(2) infinite}

.flicker{animation:flick .15s steps(2) 1}
@keyframes flick{0%{opacity:1}50%{opacity:.4}100%{opacity:1}}

@media(max-width:700px){
  .records-panel{width:60px}
  .records-panel .panel-title{font-size:.55em;padding:18px 4px 10px;text-align:center}
  .record-item{font-size:0;padding:8px;text-align:center}
  .record-item::after{content:'·';font-size:16px;color:var(--text-dim)}
  .conv-area{padding:24px 6%}
  .input-area{padding:14px 6% 18px}
  .signup-card{padding:32px 26px}
  .terms-card{padding:32px 26px}
  .sys-notif,.fake-wechat{width:calc(100vw - 32px);right:16px;bottom:16px}
}