:root{
  --primary:#008f87;--primary-strong:#006a65;--primary-deep:#004d49;--primary-soft:#c6f4ef;
  --accent:#7c4dff;--canvas:#eaf5f4;--surface:rgba(255,255,255,.92);--surface-solid:#fff;
  --surface-2:#f4fbfa;--surface-3:#e5f2f0;--text:#172321;--muted:#657875;--border:#d4e4e1;
  --danger:#ba1a1a;--shadow:0 1px 2px rgba(0,45,42,.04),0 18px 45px rgba(0,45,42,.10);
  --radius:22px;--safe-bottom:env(safe-area-inset-bottom,0px);color-scheme:light;
}
:root[data-theme="dark"]{
  --primary:#62d8d0;--primary-strong:#42bdb6;--primary-deep:#b8f4ef;--primary-soft:#154c49;
  --accent:#b9a4ff;--canvas:#0e1716;--surface:rgba(26,37,35,.94);--surface-solid:#1a2523;
  --surface-2:#14201e;--surface-3:#243431;--text:#f2f7f6;--muted:#aebdb9;--border:#344643;
  --danger:#ffb4ab;--shadow:0 18px 55px rgba(0,0,0,.32);color-scheme:dark;
}
*{box-sizing:border-box}html,body,#app{height:100%;margin:0}body{font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Arial,sans-serif;background:var(--canvas);color:var(--text);font-size:16px;line-height:1.5;overflow:hidden}button,input,textarea{font:inherit}button{cursor:pointer}button:focus-visible,input:focus-visible,textarea:focus-visible{outline:3px solid color-mix(in srgb,var(--primary) 28%,transparent);outline-offset:2px}.hidden{display:none!important}
body:before{content:"";position:fixed;inset:0;pointer-events:none;background:radial-gradient(circle at 6% 4%,color-mix(in srgb,var(--primary) 16%,transparent),transparent 34%),radial-gradient(circle at 94% 86%,color-mix(in srgb,var(--accent) 9%,transparent),transparent 30%)}
.icon-btn{width:44px;height:44px;border:1px solid transparent;border-radius:14px;background:transparent;color:var(--muted);display:grid;place-items:center;font-size:21px;line-height:1;transition:.18s ease}.icon-btn:hover{background:var(--surface-3);border-color:var(--border);color:var(--primary-deep);transform:translateY(-1px)}.primary-btn{min-height:50px;border:0;border-radius:15px;padding:0 22px;background:linear-gradient(135deg,var(--primary),var(--primary-strong));color:white;font-weight:760;box-shadow:0 7px 18px color-mix(in srgb,var(--primary) 25%,transparent);transition:.18s ease}.primary-btn:hover{filter:saturate(1.08) brightness(.96);transform:translateY(-1px)}.primary-btn:disabled{opacity:.52;cursor:not-allowed;transform:none}.text-btn{min-height:44px;border:0;background:transparent;color:var(--primary-deep);font-weight:700;padding:0 12px;border-radius:12px}.text-btn:hover{background:var(--primary-soft)}
.theme-fab{position:fixed;top:24px;right:24px;z-index:10;background:var(--surface);border:1px solid var(--border);box-shadow:var(--shadow);backdrop-filter:blur(14px)}
.auth-page{height:100%;display:grid;grid-template-columns:minmax(400px,1.15fr) minmax(390px,.85fr);padding:24px;gap:24px;position:relative}.auth-brand{position:relative;overflow:hidden;border-radius:30px;background:radial-gradient(circle at 100% 0%,rgba(255,255,255,.12) 0 28%,transparent 28.2%),radial-gradient(circle at 0% 100%,rgba(255,255,255,.10) 0 20%,transparent 20.2%),linear-gradient(145deg,#006b66,#00b8ae);color:#fff;display:flex;align-items:center;justify-content:center;padding:48px;box-shadow:0 24px 60px rgba(0,88,82,.22)}.auth-brand:after{content:"";position:absolute;inset:0;background:linear-gradient(120deg,transparent 35%,rgba(255,255,255,.08),transparent 65%);transform:translateX(-100%);animation:shine 8s ease-in-out infinite}.brand-stack{position:relative;z-index:1;text-align:center;max-width:480px}.brand-art{width:min(250px,58%);aspect-ratio:1;border-radius:36px;object-fit:cover;border:1px solid rgba(255,255,255,.28);box-shadow:0 28px 65px rgba(0,45,42,.30)}.brand-stack h1{font-size:clamp(46px,6vw,76px);line-height:1;margin:28px 0 12px;letter-spacing:-.055em}.brand-stack p{margin:0;font-size:20px;color:rgba(255,255,255,.84)}.auth-card-wrap{display:flex;align-items:center;justify-content:center}.auth-card{width:100%;max-width:440px;background:var(--surface);border:1px solid color-mix(in srgb,var(--border) 88%,transparent);border-radius:26px;padding:34px;box-shadow:var(--shadow);backdrop-filter:blur(20px)}.mobile-brand{display:none;align-items:center;gap:12px;margin-bottom:28px}.mobile-brand img{width:54px;height:54px;border-radius:16px}.mobile-brand strong{font-size:26px;color:var(--primary-deep)}.auth-card h2{font-size:32px;line-height:1.16;margin:0 0 8px;letter-spacing:-.035em}.auth-card .sub{margin:0 0 24px;color:var(--muted)}.tabs{display:grid;grid-template-columns:1fr 1fr;background:var(--surface-3);padding:4px;border-radius:15px;margin-bottom:22px}.tab{height:44px;border:0;border-radius:12px;background:transparent;color:var(--muted);font-weight:730}.tab.active{background:var(--surface-solid);color:var(--primary-deep);box-shadow:0 2px 8px rgba(0,50,47,.10)}.field{display:grid;gap:7px;margin:14px 0}.field label{font-size:14px;font-weight:720;color:var(--text)}.field input{width:100%;height:52px;border:1px solid var(--border);border-radius:14px;padding:0 15px;color:var(--text);background:var(--surface-solid);transition:.16s}.field input:focus{border-color:var(--primary);box-shadow:0 0 0 4px color-mix(in srgb,var(--primary) 10%,transparent)}.auth-card .primary-btn{width:100%;margin-top:12px}.form-error{min-height:22px;color:var(--danger);font-size:14px;margin-top:8px}.security-note{display:flex;align-items:center;justify-content:center;gap:7px;color:var(--muted);font-size:13px;margin-top:18px}.verify-icon{width:74px;height:74px;border-radius:23px;background:linear-gradient(145deg,var(--primary-soft),var(--surface-3));display:grid;place-items:center;font-size:34px;margin-bottom:20px;color:var(--primary-deep)}
.app-shell{height:100%;max-width:1560px;margin:0 auto;padding:14px;display:grid;grid-template-columns:370px minmax(0,1fr);gap:14px;position:relative}.panel{background:var(--surface);border:1px solid color-mix(in srgb,var(--border) 92%,transparent);border-radius:24px;overflow:hidden;box-shadow:var(--shadow);backdrop-filter:blur(18px)}.sidebar{display:flex;flex-direction:column;min-width:0}.side-head{height:82px;display:flex;align-items:center;padding:0 16px;border-bottom:1px solid var(--border);gap:12px}.mini-logo{width:48px;height:48px;border-radius:15px;object-fit:cover;box-shadow:0 4px 12px rgba(0,100,94,.18)}.wordmark{font-size:25px;font-weight:850;color:var(--primary-deep);letter-spacing:-.035em}.head-spacer{flex:1}.search-wrap{padding:15px 16px 10px}.search{height:48px;border:1px solid var(--border);background:var(--surface-2);border-radius:15px;display:flex;align-items:center;padding:0 14px;gap:10px;color:var(--muted);transition:.16s}.search:focus-within{border-color:var(--primary);box-shadow:0 0 0 4px color-mix(in srgb,var(--primary) 9%,transparent)}.search input{border:0;outline:0;background:transparent;min-width:0;flex:1;color:var(--text)}.chat-list{overflow:auto;flex:1;padding:4px 9px 14px;scrollbar-width:thin;scrollbar-color:var(--border) transparent}.chat-item{width:100%;border:0;background:transparent;border-radius:17px;padding:12px;display:grid;grid-template-columns:54px minmax(0,1fr);gap:12px;text-align:left;color:var(--text);transition:.16s}.chat-item:hover{background:var(--surface-2);transform:translateX(2px)}.chat-item.active{background:linear-gradient(110deg,var(--primary-soft),color-mix(in srgb,var(--surface-2) 75%,var(--primary-soft)));box-shadow:inset 3px 0 var(--primary)}.avatar{width:54px;height:54px;border-radius:18px;background:linear-gradient(145deg,var(--primary-soft),color-mix(in srgb,var(--primary-soft) 72%,var(--accent)));display:grid;place-items:center;color:var(--primary-deep);font-weight:850;font-size:20px;overflow:hidden}.chat-copy{min-width:0}.chat-line{display:flex;gap:8px;align-items:baseline}.chat-title{font-weight:770;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.chat-time{margin-left:auto;color:var(--muted);font-size:12px;white-space:nowrap}.chat-preview{font-size:14px;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;margin-top:4px}.empty-list{height:100%;display:grid;place-items:center;text-align:center;padding:32px;color:var(--muted)}.empty-list .big{font-size:44px;display:block;margin-bottom:8px;color:var(--primary)}
.chat-panel{display:flex;flex-direction:column;min-width:0}.chat-head{height:82px;display:flex;align-items:center;padding:0 20px;border-bottom:1px solid var(--border);gap:12px;background:color-mix(in srgb,var(--surface-solid) 72%,transparent)}.back-btn{display:none}.chat-head .avatar{position:relative}.chat-head .avatar:after{content:"";position:absolute;right:1px;bottom:1px;width:11px;height:11px;border-radius:50%;background:#37c977;border:3px solid var(--surface-solid)}.chat-head-copy{min-width:0}.chat-head-title{font-size:17px;font-weight:820;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.chat-head-sub{font-size:13px;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.messages{flex:1;overflow:auto;padding:26px;display:flex;flex-direction:column;gap:9px;background:linear-gradient(color-mix(in srgb,var(--surface-2) 92%,transparent),color-mix(in srgb,var(--surface-2) 92%,transparent)),radial-gradient(circle at 12px 12px,color-mix(in srgb,var(--primary) 14%,transparent) 1.2px,transparent 1.3px);background-size:auto,26px 26px;scrollbar-width:thin}.message{max-width:min(70%,640px);padding:11px 14px 7px;border-radius:19px 19px 19px 6px;background:var(--surface-solid);border:1px solid var(--border);align-self:flex-start;box-shadow:0 4px 14px rgba(0,40,38,.05);white-space:pre-wrap;word-break:break-word;animation:message-in .18s ease-out}.message.mine{align-self:flex-end;background:linear-gradient(145deg,var(--primary-soft),color-mix(in srgb,var(--primary-soft) 78%,var(--surface-solid)));border-color:color-mix(in srgb,var(--primary) 28%,var(--border));border-radius:19px 19px 6px 19px}.message-time{text-align:right;font-size:11px;color:var(--muted);margin-top:4px}.file-card{display:flex;align-items:center;gap:10px;border:0;background:transparent;padding:2px 0;color:var(--text);text-align:left;max-width:100%}.file-icon{width:38px;height:38px;border-radius:12px;background:color-mix(in srgb,var(--primary) 13%,transparent);display:grid;place-items:center;color:var(--primary-deep);flex:0 0 auto}.file-name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.composer{padding:12px 16px calc(12px + var(--safe-bottom));display:flex;gap:9px;align-items:flex-end;border-top:1px solid var(--border);background:var(--surface-solid)}.composer textarea{min-height:48px;max-height:140px;resize:none;flex:1;border:1px solid var(--border);border-radius:17px;padding:12px 15px;line-height:1.4;outline:none;background:var(--surface-2);color:var(--text);transition:.16s}.composer textarea:focus{border-color:var(--primary);background:var(--surface-solid);box-shadow:0 0 0 4px color-mix(in srgb,var(--primary) 9%,transparent)}.send-btn{background:linear-gradient(145deg,var(--primary),var(--primary-strong));color:white;border-radius:16px;box-shadow:0 5px 14px color-mix(in srgb,var(--primary) 24%,transparent)}.send-btn:hover{color:white;border-color:transparent}.welcome{height:100%;display:grid;place-items:center;text-align:center;padding:32px;background:radial-gradient(circle at center,color-mix(in srgb,var(--primary) 12%,transparent),transparent 36%),var(--surface-2)}.welcome img{width:158px;height:158px;border-radius:38px;box-shadow:0 20px 46px rgba(0,100,94,.18)}.welcome h2{margin:22px 0 6px;font-size:28px;letter-spacing:-.03em}.welcome p{margin:0;color:var(--muted)}
.modal-backdrop{position:fixed;inset:0;background:rgba(0,35,33,.44);display:grid;place-items:center;padding:20px;z-index:20;backdrop-filter:blur(8px)}.modal{width:min(470px,100%);max-height:min(680px,90vh);overflow:auto;background:var(--surface-solid);border:1px solid var(--border);border-radius:24px;padding:24px;box-shadow:0 28px 90px rgba(0,30,28,.35)}.modal-head{display:flex;align-items:center;margin-bottom:18px}.modal h3{font-size:23px;margin:0;letter-spacing:-.025em}.people{display:grid;gap:6px;margin-top:12px}.person{border:0;background:transparent;color:var(--text);border-radius:16px;padding:10px;display:grid;grid-template-columns:48px 1fr;gap:12px;text-align:left}.person:hover{background:var(--surface-3)}.person .avatar{width:48px;height:48px}.person-email{font-size:13px;color:var(--muted);overflow:hidden;text-overflow:ellipsis}.toast{position:fixed;left:50%;bottom:28px;transform:translate(-50%,20px);background:#263331;color:#fff;border-radius:14px;padding:12px 18px;opacity:0;pointer-events:none;transition:.2s;z-index:50;max-width:min(90vw,520px);text-align:center;box-shadow:var(--shadow)}.toast.show{opacity:1;transform:translate(-50%,0)}.spinner{width:20px;height:20px;border:2px solid rgba(255,255,255,.35);border-top-color:#fff;border-radius:50%;animation:spin .7s linear infinite;margin:auto}
@keyframes spin{to{transform:rotate(360deg)}}@keyframes shine{0%,55%{transform:translateX(-110%)}75%,100%{transform:translateX(110%)}}@keyframes message-in{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}
@media(max-width:760px){body{background:var(--surface-solid)}body:before{display:none}.auth-page{display:block;padding:0;overflow:auto}.auth-brand{display:none}.auth-card-wrap{min-height:100%;padding:24px}.auth-card{border:0;box-shadow:none;padding:12px 0;background:transparent;backdrop-filter:none}.mobile-brand{display:flex}.theme-fab{top:18px;right:18px}.app-shell{display:block;padding:0}.panel{border:0;border-radius:0;box-shadow:none;height:100%;backdrop-filter:none}.sidebar{display:flex}.chat-panel{display:none}.app-shell.chat-open .sidebar{display:none}.app-shell.chat-open .chat-panel{display:flex}.side-head,.chat-head{height:72px}.back-btn{display:grid}.messages{padding:16px}.message{max-width:87%}.composer{padding-left:8px;padding-right:8px}.welcome{display:none}.modal{border-radius:22px}.chat-item:hover{transform:none}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;animation:none!important;transition:none!important}}