:root{
    --c-bg:#F5F7FB;
    --c-card:#fff;
    --c-ink:#0B1530;
    --c-ink-soft:#2A3656;
    --c-muted:#6B7691;
    --c-line:#E4E8F1;
    --c-primary:#1A6CFF;
    --c-accent:#00C2A8;
    --c-deep:#06122E;
    --shadow:0 8px 24px -8px rgba(11,21,48,.10),0 2px 6px rgba(11,21,48,.05);
    --radius:14px;
}
*{box-sizing:border-box}
[hidden]{display:none !important}
html,body{margin:0;padding:0;height:100%}
body{font-family:"HarmonyOS Sans SC","PingFang SC","Microsoft YaHei",sans-serif;color:var(--c-ink);background:var(--c-bg);font-size:14px;line-height:1.55}
button{font-family:inherit;cursor:pointer;border:none;background:none}
input,textarea{font-family:inherit;font-size:inherit}

.kf-btn{display:inline-flex;align-items:center;gap:6px;height:34px;padding:0 14px;border-radius:10px;font-weight:600;font-size:13px;letter-spacing:.02em;transition:all .15s}
.kf-btn--primary{background:linear-gradient(135deg,var(--c-primary),var(--c-accent));color:#fff;box-shadow:0 6px 14px -6px rgba(26,108,255,.5)}
.kf-btn--primary:hover{transform:translateY(-1px)}
.kf-btn--ghost{background:#fff;color:var(--c-ink);border:1px solid var(--c-line)}
.kf-btn--ghost:hover{background:var(--c-bg)}
.kf-btn--primary:disabled{opacity:.5;cursor:not-allowed;transform:none}

/* Login */
.kf-login{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#06122E 0%,#0F2452 100%);padding:24px}
.kf-login__card{width:100%;max-width:380px;background:#fff;border-radius:20px;padding:36px 32px;box-shadow:0 30px 80px -20px rgba(4,11,31,.5)}
.kf-login__brand{display:flex;align-items:center;gap:14px;margin-bottom:28px}
.kf-login__logo{width:42px;height:42px;border-radius:12px;background:linear-gradient(135deg,#1A6CFF,#00C2A8);color:#fff;font-weight:700;font-size:18px;display:flex;align-items:center;justify-content:center}
.kf-login__title{font-size:18px;font-weight:700}
.kf-login__sub{font-size:12px;color:var(--c-muted);margin-top:2px;letter-spacing:.06em}
.kf-login__form{display:flex;flex-direction:column;gap:14px}
.kf-field{display:flex;flex-direction:column;gap:6px}
.kf-field span{font-size:12px;color:var(--c-muted);font-weight:600;letter-spacing:.04em}
.kf-field input{height:42px;padding:0 14px;border:1px solid var(--c-line);border-radius:10px;background:var(--c-bg);transition:border-color .15s}
.kf-field input:focus{outline:none;border-color:var(--c-primary);background:#fff}
.kf-login__err{font-size:13px;color:#E5484D;background:rgba(229,72,77,.08);padding:10px 12px;border-radius:8px}
.kf-field--captcha .kf-captcha-row{display:flex;gap:8px;align-items:stretch}
.kf-field--captcha input{flex:1;text-transform:uppercase;letter-spacing:.08em;font-family:'JetBrains Mono',monospace}
.kf-captcha-img{width:130px;height:44px;padding:0;border:1px solid var(--c-line);border-radius:8px;background:#F4F7FB;cursor:pointer;overflow:hidden;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:border-color .15s}
.kf-captcha-img:hover{border-color:var(--c-primary)}
.kf-captcha-img img{display:block;width:100%;height:100%;object-fit:contain}
.kf-remember{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--c-muted);cursor:pointer;user-select:none}
.kf-remember input{width:15px;height:15px;cursor:pointer;accent-color:var(--c-primary)}
.kf-remember:hover{color:var(--c-ink)}
.kf-login__submit{height:44px;border-radius:12px;margin-top:6px}
.kf-login__divider{display:flex;align-items:center;gap:12px;margin:18px 0 14px;color:var(--c-muted);font-size:11.5px;letter-spacing:.1em}
.kf-login__divider::before,.kf-login__divider::after{content:'';flex:1;height:1px;background:var(--c-line)}
.kf-login__divider span{padding:0 6px}
.kf-passkey-btn{width:100%;height:42px;border-radius:10px;background:#fff;color:var(--c-ink);border:1px solid var(--c-line);display:flex;align-items:center;justify-content:center;gap:8px;cursor:pointer;font-size:14px;font-weight:600;font-family:inherit;transition:border-color .15s,background .15s,color .15s}
.kf-passkey-btn:hover:not(:disabled){border-color:var(--c-primary);color:var(--c-primary);background:#F8FAFD}
.kf-passkey-btn:disabled{opacity:.55;cursor:not-allowed}
.kf-passkey-icon{font-size:18px;line-height:1}
.kf-login__hint--passkey{margin-top:10px;color:#8a6500;font-size:12px;text-align:center;letter-spacing:0;line-height:1.6}
.kf-login__hint{margin-top:22px;text-align:center;font-size:11px;color:var(--c-muted);letter-spacing:.06em}

/* App layout */
.kf-app{display:flex;flex-direction:column;height:100vh}
.kf-top{height:62px;background:#fff;border-bottom:1px solid var(--c-line);display:flex;justify-content:space-between;align-items:center;padding:0 20px;flex:none}
.kf-top__brand{display:flex;align-items:center;gap:12px}
.kf-top__title{font-size:15px;font-weight:700}
.kf-top__sub{font-size:11.5px;color:var(--c-muted);margin-top:1px}
.kf-top__actions{display:flex;align-items:center;gap:12px}
.kf-conn-dot{width:10px;height:10px;border-radius:50%;background:#FBBF24;box-shadow:0 0 0 3px rgba(251,191,36,.18)}
.kf-conn-dot.is-on{background:#34D399;box-shadow:0 0 0 3px rgba(52,211,153,.18)}
.kf-btn.kf-notif--ok{color:#059669;border-color:rgba(5,150,105,.3);background:rgba(16,185,129,.06)}
.kf-btn.kf-notif--insecure{color:#9CA3AF;background:#F5F7FB}
.kf-btn.kf-notif--insecure:disabled{opacity:.7}

.kf-main{flex:1;display:flex;overflow:hidden}
.kf-side{width:300px;background:#fff;border-right:1px solid var(--c-line);display:flex;flex-direction:column;flex:none}
.kf-side__head{padding:14px 18px;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--c-line)}
.kf-side__title{font-weight:700;font-size:14px}
.kf-side__count{background:var(--c-bg);color:var(--c-muted);font-size:11px;padding:3px 9px;border-radius:999px;font-family:'JetBrains Mono',monospace}
.kf-side__list{flex:1;overflow-y:auto;padding:8px}

/* Filter (search + chips) */
.kf-filter{padding:10px 12px 8px;border-bottom:1px solid var(--c-line);background:#fafbfd}
.kf-search{position:relative;margin-bottom:8px}
.kf-search input{width:100%;padding:7px 28px 7px 10px;border:1px solid var(--c-line);border-radius:6px;font-size:12.5px;font-family:inherit;color:#0B1530;background:#fff;box-sizing:border-box;transition:border-color .15s,box-shadow .15s}
.kf-search input:focus{outline:0;border-color:#1A6CFF;box-shadow:0 0 0 3px rgba(26,108,255,.12)}
.kf-search button{position:absolute;right:4px;top:50%;transform:translateY(-50%);background:transparent;border:0;cursor:pointer;color:#9CA3AF;font-size:16px;line-height:1;padding:2px 6px;font-family:inherit}
.kf-search button:hover{color:#0B1530}
.kf-filter__chips{display:flex;gap:4px;flex-wrap:wrap}
.kf-chip{padding:3px 8px;background:#fff;border:1px solid var(--c-line);border-radius:12px;font-size:11px;font-family:inherit;cursor:pointer;color:#475068;display:inline-flex;align-items:center;gap:4px;transition:all .12s;white-space:nowrap}
.kf-chip:hover{border-color:#1A6CFF;color:#1A6CFF}
.kf-chip.is-on{background:#0B1530;color:#fff;border-color:#0B1530;font-weight:600}
.kf-chip__n{font-family:'JetBrains Mono',monospace;font-size:10px;background:rgba(0,0,0,.08);padding:1px 5px;border-radius:6px;min-width:14px;text-align:center}
.kf-chip.is-on .kf-chip__n{background:rgba(255,255,255,.22);color:#fff}
.kf-side__empty-filter{padding:32px 16px;text-align:center;color:#9CA3AF;font-size:12.5px}
.kf-side__group-hdr{font-size:10.5px;font-weight:700;color:#9CA3AF;text-transform:uppercase;letter-spacing:.08em;padding:10px 6px 4px;margin-top:2px}
.kf-side__group-hdr:first-child{margin-top:0}

.kf-item{padding:12px 14px;border-radius:10px;cursor:pointer;display:flex;flex-direction:column;gap:6px;transition:background .15s;position:relative}
.kf-item:hover{background:var(--c-bg)}
.kf-item.is-active{background:linear-gradient(135deg,rgba(26,108,255,.08),rgba(0,194,168,.06));box-shadow:inset 3px 0 0 var(--c-primary)}
.kf-item__row1{display:flex;justify-content:space-between;align-items:center;gap:8px}
.kf-item__name{font-weight:600;font-size:13px;color:var(--c-ink);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:170px}
.kf-item__time{font-size:11px;color:var(--c-muted);font-family:'JetBrains Mono',monospace;flex:none}
.kf-item__preview{font-size:12.5px;color:var(--c-muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.kf-item__meta{font-size:11px;color:var(--c-muted);display:flex;gap:6px;letter-spacing:.02em}
.kf-item__unread{position:absolute;top:14px;right:14px;background:#E5484D;color:#fff;font-size:10.5px;min-width:18px;height:18px;padding:0 5px;border-radius:9px;display:inline-flex;align-items:center;justify-content:center;font-weight:700}
.kf-item__phone{font-family:'JetBrains Mono',monospace;font-size:11.5px;color:#1A6CFF;font-weight:600;margin-left:4px}
.kf-item__intent{font-size:11.5px;color:#0F2452;background:rgba(26,108,255,.08);padding:2px 8px;border-radius:999px;display:inline-block;font-weight:600;margin:1px 0}
.kf-item__tag-ok{color:#059669;background:rgba(16,185,129,.1);padding:1px 6px;border-radius:6px;font-size:10.5px;font-weight:600;letter-spacing:.02em}
.kf-chat__phone{font-family:'JetBrains Mono',monospace;font-size:13px;color:#1A6CFF;font-weight:600;margin-left:8px}
.kf-chat__intent{color:#0F2452;background:rgba(26,108,255,.1);padding:2px 8px;border-radius:6px;font-size:11.5px;font-weight:600}

.kf-chat{flex:1;display:flex;flex-direction:column;background:var(--c-bg);min-width:0}
.kf-chat__head{padding:14px 22px;background:#fff;border-bottom:1px solid var(--c-line);display:flex;justify-content:space-between;align-items:center}
.kf-chat__title{font-weight:700;font-size:15px}
.kf-chat__meta{font-size:12px;color:var(--c-muted);margin-top:3px}
.kf-chat__body{flex:1;overflow-y:auto;padding:24px 28px;display:flex;flex-direction:column;gap:10px}
.kf-chat__body--empty{align-items:center;justify-content:center}
.kf-empty{text-align:center;color:var(--c-muted)}
.kf-empty__icon{font-size:48px;margin-bottom:12px;opacity:.5}
.kf-empty__title{font-size:15px;font-weight:600;color:var(--c-ink-soft);margin-bottom:6px}
.kf-empty__sub{font-size:13px}

.kf-msg{display:flex;gap:8px;max-width:70%;animation:kfMsgIn .2s ease}
@keyframes kfMsgIn{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}
.kf-msg--visitor{align-self:flex-start}
.kf-msg--agent{align-self:flex-end;flex-direction:row-reverse}
.kf-msg__bubble{padding:10px 14px;border-radius:14px;font-size:14px;line-height:1.55;word-break:break-word;white-space:pre-wrap;box-shadow:0 1px 2px rgba(11,21,48,.06)}
.kf-msg--visitor .kf-msg__bubble{background:#fff;color:var(--c-ink);border-bottom-left-radius:4px}
.kf-msg--agent .kf-msg__bubble{background:linear-gradient(135deg,var(--c-primary),#3B82F6);color:#fff;border-bottom-right-radius:4px}
.kf-msg__meta{font-size:11px;color:var(--c-muted);margin-top:4px;padding:0 4px}
.kf-msg--agent .kf-msg__meta{text-align:right}

.kf-sys{align-self:center;font-size:12px;color:var(--c-muted);background:rgba(11,43,111,.04);padding:5px 12px;border-radius:999px}
.kf-typing{align-self:flex-start;display:inline-flex;align-items:center;gap:6px;padding:8px 14px;background:#fff;border-radius:14px;border-bottom-left-radius:4px;color:#6B7691;font-size:12.5px;box-shadow:0 1px 2px rgba(11,21,48,.06);animation:kfMsgIn .2s ease}
.kf-typing i{display:inline-block;width:5px;height:5px;border-radius:50%;background:#1A6CFF;animation:kfDot 1.1s infinite}
.kf-typing i:nth-child(3){animation-delay:.18s}
.kf-typing i:nth-child(4){animation-delay:.36s}
@keyframes kfDot{0%,60%,100%{opacity:.3;transform:translateY(0)}30%{opacity:1;transform:translateY(-3px)}}

.kf-chat__input{padding:14px 22px;background:#fff;border-top:1px solid var(--c-line);display:flex;gap:10px;align-items:flex-end;position:relative}
.kf-chat__quick-btn{flex:none;height:38px;padding:0 12px;font-size:16px}
.kf-quick{position:absolute;bottom:62px;left:22px;width:340px;max-width:calc(100vw - 44px);background:#fff;border:1px solid var(--c-line);border-radius:12px;box-shadow:0 16px 40px -12px rgba(11,21,48,.25);overflow:hidden;z-index:10}
.kf-quick__head{padding:10px 16px;background:linear-gradient(135deg,rgba(26,108,255,.05),rgba(0,194,168,.04));border-bottom:1px solid var(--c-line);display:flex;justify-content:space-between;align-items:center;font-size:13px;font-weight:600;color:var(--c-ink)}
.kf-quick__hint{font-size:11px;color:var(--c-muted);font-weight:500}
.kf-quick__list{list-style:none;margin:0;padding:6px;max-height:320px;overflow-y:auto}
.kf-quick__item{padding:10px 12px;border-radius:8px;cursor:pointer;transition:background .12s}
.kf-quick__item:hover{background:var(--c-bg-soft)}
.kf-quick__lbl{font-size:13px;font-weight:600;color:var(--c-ink);margin-bottom:3px}
.kf-quick__preview{font-size:11.5px;color:var(--c-muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;letter-spacing:.01em}
.kf-chat__input textarea{flex:1;border:1px solid var(--c-line);border-radius:10px;padding:10px 14px;resize:none;max-height:120px;outline:none;transition:border-color .15s;font-size:14px}
.kf-chat__input textarea:focus{border-color:var(--c-primary)}
.kf-chat__input .kf-btn{height:38px;padding:0 18px}

@media (max-width:780px){
    .kf-side{width:240px}
    .kf-chat__body{padding:18px}
}

/* ============ Settings modal ============ */
.kf-modal{position:fixed;inset:0;z-index:9999;display:flex;align-items:center;justify-content:center;padding:24px}
.kf-modal[hidden]{display:none !important}
.kf-modal__backdrop{position:absolute;inset:0;background:rgba(4,11,31,.65);backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px)}
.kf-modal__card{position:relative;background:#fff;border-radius:18px;width:100%;max-width:560px;max-height:calc(100vh - 48px);overflow-y:auto;box-shadow:0 30px 80px -20px rgba(4,11,31,.5);animation:kfModalIn .25s cubic-bezier(.16,1,.3,1)}
@keyframes kfModalIn{from{opacity:0;transform:translateY(10px) scale(.96)}to{opacity:1;transform:translateY(0) scale(1)}}
.kf-settings__head{padding:28px 30px 18px;background:linear-gradient(135deg,#06122E,#0F2452);color:#fff;display:flex;justify-content:space-between;align-items:flex-start;gap:14px}
.kf-settings__eyebrow{font-size:11px;letter-spacing:.18em;color:rgba(255,255,255,.55);text-transform:uppercase;font-weight:700;margin-bottom:6px}
.kf-settings__title{font-size:22px;font-weight:700;margin:0 0 6px;letter-spacing:-.005em}
.kf-settings__sub{margin:0;font-size:13px;color:rgba(255,255,255,.62);line-height:1.6}
.kf-settings__close{flex:none;width:30px;height:30px;border-radius:8px;background:rgba(255,255,255,.08);color:#fff;border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .15s}
.kf-settings__close:hover{background:rgba(255,255,255,.16)}
.kf-settings__status{margin:0;padding:14px 28px;font-size:13.5px;line-height:1.6}
.kf-settings__status--warn{background:rgba(245,158,11,.1);color:#92400E;border-bottom:1px solid rgba(245,158,11,.2)}
.kf-settings__status--ok{background:rgba(16,185,129,.08);color:#065F46;border-bottom:1px solid rgba(16,185,129,.2)}
.kf-settings__status code{font-family:'JetBrains Mono',monospace;font-size:12.5px;background:rgba(255,255,255,.6);padding:1px 6px;border-radius:4px}
.kf-settings__form{padding:24px 30px 28px;display:flex;flex-direction:column;gap:16px}
.kf-settings__field{display:flex;flex-direction:column;gap:5px}
.kf-settings__field label{font-size:12.5px;color:var(--c-muted);font-weight:600;letter-spacing:.02em}
.kf-settings__field input{height:40px;padding:0 12px;font-size:14px;border:1px solid var(--c-line);border-radius:9px;background:var(--c-bg-soft);color:var(--c-ink);outline:none;transition:border-color .15s,background .15s;font-family:inherit}
.kf-settings__field input:focus{border-color:var(--c-primary);background:#fff}
.kf-settings__row{display:flex;gap:12px}
.kf-settings__row .kf-settings__field{flex:none;width:120px}
.kf-settings__row .kf-settings__field--grow{flex:1;width:auto}
.kf-settings__tip{font-size:11.5px;color:var(--c-muted);margin-top:3px;line-height:1.5}
.kf-settings__tip code{font-family:'JetBrains Mono',monospace;font-size:11px;background:var(--c-bg-soft);padding:1px 5px;border-radius:4px;color:var(--c-primary)}
.kf-settings__hint{font-weight:400;color:var(--c-muted);font-size:11px;margin-left:6px}
.kf-settings__err{font-size:13px;color:#E5484D;background:rgba(229,72,77,.08);padding:10px 12px;border-radius:8px;border:1px solid rgba(229,72,77,.18)}
.kf-settings__ok{font-size:13px;color:#059669;background:rgba(16,185,129,.08);padding:10px 12px;border-radius:8px;border:1px solid rgba(16,185,129,.18)}
.kf-settings__actions{display:flex;justify-content:flex-end;gap:10px;margin-top:8px;padding-top:18px;border-top:1px solid var(--c-line)}