:root{
    color-scheme:dark;
    --bg:#17181c; --panel:#212227; --border:#2d2f36; --text:#e7e8ea;
    --text-dim:#9a9ca3; --text-faint:#6d6f76; --red:#cd2b31; --red-dark:#a8232a;
    --green:#22a35a; --btn-bg:#2a2b31; --btn-bg-hover:#34353c; --row-hover:#25262c;
    --shadow:0 1px 3px rgba(0,0,0,.35);
    --r:8px; --rlg:12px; --knob:#ffffff;
    padding-top:env(safe-area-inset-top,0px); padding-bottom:env(safe-area-inset-bottom,0px);
  }
  :root[data-theme="light"]{
    color-scheme:light;
    --bg:#f4f6f9; --panel:#ffffff; --border:#e3e6ec; --text:#1f2430;
    --text-dim:#6b7280; --text-faint:#9aa1ad; --btn-bg:#eef0f4; --btn-bg-hover:#e2e5eb;
    --row-hover:#fafbfc; --shadow:0 1px 3px rgba(20,20,30,.06),0 1px 2px rgba(20,20,30,.04);
  }
  *{box-sizing:border-box;}
  html,body{height:100%;}
  body{margin:0;background:var(--bg);color:var(--text);
    font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
    -webkit-font-smoothing:antialiased;}
  svg{display:block;}
  .hidden{display:none !important;}

  /* ---------- LOGIN ---------- */
  #loginView{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:16px;}
  .login-brand{display:flex;align-items:center;gap:10px;font-size:26px;font-weight:700;margin-bottom:36px;}
  .login-brand svg{width:30px;height:30px;}
  .login-card{width:100%;max-width:340px;background:var(--panel);border:1px solid var(--border);
    border-radius:var(--rlg);box-shadow:var(--shadow);padding:32px 28px 28px;}
  .field{position:relative;margin-bottom:14px;}
  .field input{width:100%;padding:11px 14px;border-radius:var(--r);border:1px solid var(--border);
    background:var(--bg);color:var(--text);font-size:14.5px;outline:none;}
  .field input:focus{border-color:var(--red);}
  .field input::placeholder{color:var(--text-faint);}
  .field .icons{position:absolute;right:10px;top:50%;transform:translateY(-50%);display:flex;gap:5px;color:var(--text-faint);}
  .field .icons svg{width:14px;height:14px;}
  .remember{display:flex;align-items:center;gap:10px;margin:6px 0 18px;font-size:14px;color:var(--text-dim);}
  .signin-btn{width:100%;padding:11px;border-radius:var(--r);border:none;background:var(--btn-bg);
    color:var(--text);font-size:14.5px;font-weight:600;cursor:pointer;}
  .signin-btn:hover{background:var(--btn-bg-hover);}

  /* ---------- APP SHELL ---------- */
  .wrap{max-width:980px;margin:0 auto;padding:28px 20px 60px;}
  header{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px;flex-wrap:wrap;gap:12px;}
  .brand{display:flex;align-items:center;gap:10px;font-size:24px;font-weight:700;letter-spacing:-.3px;}
  .brand svg{width:26px;height:26px;flex-shrink:0;}
  .header-actions{display:flex;align-items:center;gap:10px;position:relative;}
  .icon-btn{width:38px;height:38px;border-radius:50%;background:var(--btn-bg);border:none;
    display:flex;align-items:center;justify-content:center;color:var(--text-dim);cursor:pointer;}
  .icon-btn:hover{background:var(--btn-bg-hover);}
  .icon-btn svg{width:18px;height:18px;}
  .avatar-btn{width:36px;height:36px;border-radius:50%;background:var(--red);border:none;color:#fff;
    font-size:14px;font-weight:700;cursor:pointer;display:flex;align-items:center;justify-content:center;}

  .popover{position:absolute;top:48px;right:0;width:210px;background:var(--panel);border:1px solid var(--border);
    border-radius:var(--r);box-shadow:0 8px 24px rgba(0,0,0,.18);padding:16px;z-index:40;}
  .popover .p-name{font-weight:700;font-size:15px;margin-bottom:14px;}
  .popover button.menu-item{width:100%;text-align:left;padding:9px 10px;border-radius:var(--r);border:none;
    background:transparent;color:var(--text);font-size:14px;cursor:pointer;}
  .popover button.menu-item:hover{background:var(--row-hover);}
  .popover hr{border:none;border-top:1px solid var(--border);margin:8px 0;}

  .tabs{display:flex;gap:6px;flex-wrap:wrap;padding:3px;background:var(--bg);border:1px solid var(--border);border-radius:var(--r);}
  .tab{padding:7px 14px;border-radius:calc(var(--r) - 2px);border:none;background:transparent;
    color:var(--text-dim);font-size:14px;font-weight:600;cursor:pointer;}
  .tab:hover{background:var(--btn-bg-hover);}
  .tab.active{background:var(--red);color:#fff;}
  .tab.active:hover{background:var(--red-dark);}

  .panel{background:var(--panel);border:1px solid var(--border);border-radius:var(--rlg);box-shadow:var(--shadow);overflow:hidden;}
  .panel-head{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:20px 24px;flex-wrap:wrap;}
  .panel-head h1{font-size:21px;margin:0;font-weight:700;}
  .head-controls{display:flex;gap:10px;align-items:center;flex-wrap:wrap;width:100%;}
  .search{position:relative;flex:1;min-width:140px;}
  .search input{width:100%;padding:9px 12px 9px 32px;border-radius:var(--r);border:1px solid var(--border);
    background:var(--bg);color:var(--text);font-size:14px;outline:none;}
  .search input::placeholder{color:var(--text-faint);}
  .search svg{position:absolute;left:10px;top:50%;transform:translateY(-50%);width:15px;height:15px;color:var(--text-faint);}
  .btn{display:flex;align-items:center;gap:6px;padding:9px 16px;border-radius:var(--r);border:1px solid var(--border);
    background:var(--btn-bg);color:var(--text);font-size:14px;font-weight:500;cursor:pointer;white-space:nowrap;}
  .btn:hover{background:var(--btn-bg-hover);}
  .btn svg{width:15px;height:15px;}
  .btn-red{background:var(--red);border-color:var(--red);color:#fff;}
  .btn-red:hover{background:var(--red-dark);}

  .row{display:flex;align-items:center;gap:16px;padding:16px 24px;border-top:1px solid var(--border);}
  .row:hover{background:var(--row-hover);}
  .avatar{width:44px;height:44px;border-radius:50%;background:var(--btn-bg);display:flex;align-items:center;
    justify-content:center;flex-shrink:0;position:relative;font-size:20px;}
  .avatar svg{width:22px;height:22px;color:var(--text-faint);}
  .avatar.flag{font-size:22px;}
  .dot{position:absolute;bottom:0;right:0;width:11px;height:11px;border-radius:50%;border:2px solid var(--panel);}
  .dot.green{background:var(--green);}
  .dot.red{background:var(--red);}
  .info{flex:1;min-width:200px;}
  .info .name{font-size:15px;font-weight:600;margin-bottom:3px;}
  .info .sub{font-size:12.5px;color:var(--text-dim);}
  .info .meta{font-size:12.5px;color:var(--text-faint);margin-top:1px;}
  .row-actions{display:flex;align-items:center;gap:8px;flex-shrink:0;}

  /* rectangular toggle */
  .toggle{width:44px;height:24px;padding:0;margin:0;border-radius:var(--r);background:var(--btn-bg);border:none;position:relative;cursor:pointer;flex-shrink:0;display:block;}
  .toggle .knob{position:absolute;top:2px;left:2px;width:20px;height:20px;border-radius:calc(var(--r) - 3px);background:var(--knob);}
  .toggle.on{background:var(--red);}
  .toggle.on .knob{left:auto;right:2px;}
  .toggle.small{width:38px;height:21px;}
  .toggle.small .knob{width:17px;height:17px;}

  .icon-square{width:34px;height:34px;border-radius:var(--r);background:var(--btn-bg);border:none;display:flex;
    align-items:center;justify-content:center;color:var(--text-dim);cursor:pointer;}
  .icon-square:hover{background:var(--btn-bg-hover);}
  .icon-square svg{width:16px;height:16px;}
  .icon-square.danger:hover{color:#e0393e;}
  .empty{padding:40px 24px;text-align:center;color:var(--text-faint);font-size:14px;}

  /* ---------- DOWNLOAD CLIENTS BLOCK ---------- */
  .dl-os-row{display:flex;justify-content:center;gap:12px;flex-wrap:wrap;margin-bottom:36px;}
  .dl-os{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;width:122px;height:112px;
    border-radius:var(--rlg);border:1px solid var(--border);background:transparent;cursor:pointer;color:var(--text-dim);}
  .dl-os svg{width:32px;height:32px;}
  .dl-os span{font-size:19px;font-weight:500;}
  .dl-os:hover:not(.active){background:var(--row-hover);}
  .dl-os.active{border-color:var(--red);color:var(--red);background:var(--row-hover);}
  .dl-os:focus-visible{outline:2px solid var(--red);outline-offset:3px;}
  .dl-action{display:flex;align-items:center;justify-content:center;gap:14px;flex-wrap:wrap;}
  .dl-action .btn{min-height:61px;padding:14px 26px;font-size:21px;}
  .dl-sub{color:var(--text-dim);font-size:13.5px;}
  .dl-note{color:var(--text-dim);font-size:13px;}
  .dl-note b{color:var(--red);font-weight:600;}

  /* ---------- MODALS ---------- */
  .overlay{position:fixed;inset:0;background:rgba(10,10,14,.5);display:flex;align-items:center;
    justify-content:center;z-index:100;padding:20px;}
  .modal{width:100%;max-width:400px;background:var(--panel);border:1px solid var(--border);
    border-radius:var(--rlg);box-shadow:0 20px 50px rgba(0,0,0,.3);padding:24px;max-height:90vh;overflow-y:auto;}
  .modal-header{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:18px;}
  .modal-header h2{margin:0;font-size:19px;font-weight:700;}
  .modal-close{width:30px;height:30px;flex-shrink:0;border-radius:var(--r);border:none;background:var(--btn-bg);
    color:var(--text-dim);display:flex;align-items:center;justify-content:center;cursor:pointer;}
  .modal-close:hover{background:var(--btn-bg-hover);color:var(--text);}
  .modal-close svg{width:16px;height:16px;}
  .modal label{display:block;font-size:12.5px;color:var(--text-dim);margin:0 0 5px;font-weight:600;}
  .modal .field-row{margin-bottom:14px;}
  .server-address-row{display:grid;grid-template-columns:minmax(0,1fr) 108px;column-gap:12px;}
  .modal input,.modal select{width:100%;padding:10px 12px;border-radius:var(--r);border:1px solid var(--border);
    background:var(--bg);color:var(--text);font-size:14px;outline:none;}
  .modal input:focus,.modal select:focus{border-color:var(--red);}
  .modal input:disabled{opacity:.55;cursor:not-allowed;}
  .modal-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:20px;}
  .operation-status{margin:14px 0 0;color:var(--text-dim);font-size:13px;line-height:1.45;}
  .is-loading{cursor:wait;opacity:.7;}
  .is-loading::after{content:'';display:inline-block;width:12px;height:12px;margin-left:8px;
    border:2px solid currentColor;border-right-color:transparent;border-radius:50%;vertical-align:-2px;
    animation:operationSpin .7s linear infinite;}
  @keyframes operationSpin{to{transform:rotate(360deg);}}
  .toggle-row{display:grid;grid-template-columns:minmax(0,1fr) 104px;column-gap:12px;align-items:center;padding:9px 0;border-top:1px solid var(--border);}
  .toggle-row:first-of-type{border-top:none;margin-top:4px;}
  .toggle-row label{margin:0;font-size:14px;color:var(--text);font-weight:500;}
  .toggle-label-group{display:grid;grid-template-columns:57px 38px;align-items:center;column-gap:9px;width:104px;}
  .toggle-state-text{font-size:12.5px;color:var(--text-dim);white-space:nowrap;text-align:right;}

  .qr-box{width:220px;height:220px;margin:0 auto 18px;background:#fff;border:1px solid var(--border);
    border-radius:var(--r);display:flex;align-items:center;justify-content:center;}
  .qr-box svg{width:190px;height:190px;}
  .config-text{background:var(--bg);border:1px solid var(--border);border-radius:var(--r);padding:12px;
    font-family:ui-monospace,Menlo,monospace;font-size:11.5px;color:var(--text-dim);white-space:pre-wrap;
    word-break:break-all;max-height:120px;overflow-y:auto;margin-bottom:16px;}

  /* ---------- TOASTS ---------- */
  .toast-stack{position:fixed;top:calc(18px + env(safe-area-inset-top,0px));right:18px;z-index:200;
    display:flex;flex-direction:column;gap:10px;width:300px;max-width:calc(100vw - 32px);}
  .toast{display:flex;align-items:flex-start;gap:10px;background:var(--panel);border:1px solid var(--border);
    border-left:4px solid var(--green);border-radius:var(--r);box-shadow:0 8px 20px rgba(0,0,0,.18);
    padding:12px 14px;animation:toastIn .2s ease;}
  .toast-error{border-left-color:var(--red);}
  .toast .t-icon,.toast .t-title{color:var(--green);}
  .toast-error .t-icon,.toast-error .t-title{color:var(--red);}
  .toast .t-icon{flex-shrink:0;margin-top:1px;}
  .toast .t-icon svg{width:18px;height:18px;}
  .toast .t-body{flex:1;}
  .toast .t-title{font-size:13.5px;font-weight:700;margin-bottom:2px;}
  .toast .t-msg{font-size:12.5px;color:var(--text-dim);}
  .toast .t-close{background:none;border:none;color:var(--text-faint);cursor:pointer;padding:2px;flex-shrink:0;}
  .toast .t-close svg{width:14px;height:14px;}
  @keyframes toastIn{from{opacity:0;transform:translateX(16px);}to{opacity:1;transform:translateX(0);}}

  @media (max-width:640px){
    .panel-head{flex-direction:column;align-items:stretch;}
    .head-controls{justify-content:space-between;}
    .search{flex:1;}
    .search input{width:100%;}
    .row{flex-wrap:wrap;}
    .row-actions{margin-left:auto;}
  }

  /* Native forms and live data retain the mockup's layout. */
  a{color:inherit;text-decoration:none;}
  button,input,select{font-family:inherit;}
  button:disabled{opacity:.48;cursor:not-allowed;}
  .sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0;}
  .remember-input{position:absolute;opacity:0;width:1px;height:1px;}
  .remember-input:checked + .toggle{background:var(--red);}
  .remember-input:checked + .toggle .knob{left:auto;right:2px;}
  .remember-input:focus-visible + .toggle{outline:2px solid var(--red);outline-offset:3px;}
  .popover form{margin:0;}
  .popover .menu-item{display:block;}
  .row-warning{font-size:12px;color:var(--red);margin-top:4px;}
  .info .sub,.info .meta{line-height:1.45;}
  .row-actions .toggle{flex-shrink:0;}
  .modal form{margin:0;}
  .modal .field-row label{margin-bottom:5px;}
  .modal .field-row input,.modal .field-row select{display:block;}
  .modal .toggle-row label{margin:0;}
  .modal-wide{max-width:480px;}
  .download-modal{max-width:760px;padding:38px 40px 60px;}
  .download-modal .modal-header{margin-bottom:30px;}
  .download-modal .modal-header h2{font-size:30px;}
  .download-modal .modal-close{width:48px;height:48px;border-radius:12px;}
  .download-modal .modal-close svg{width:22px;height:22px;}
  .confirm-text{color:var(--text-dim);font-size:14px;line-height:1.5;}
  .qr-box img{width:190px;height:190px;object-fit:contain;}
  .config-wrap{position:relative;}
  .config-wrap .config-text{padding-bottom:48px;}
  .config-copy{position:absolute;bottom:8px;right:8px;z-index:1;background:var(--panel);border:1px solid var(--border);}
  .confirmation-code{margin:7px 0 10px;padding:10px 12px;border:1px dashed var(--red);border-radius:var(--r);color:var(--red);font-family:ui-monospace,Menlo,monospace;font-size:20px;font-weight:700;letter-spacing:4px;text-align:center;user-select:none;}
  .metric-details{font-size:11.5px;}
  .traffic-stats{display:flex;align-items:center;gap:14px;margin-right:8px;white-space:nowrap;font-variant-numeric:tabular-nums;}
  .traffic-stat{text-align:right;min-width:74px;}
  .traffic-rate{font-size:12px;font-weight:600;color:var(--text);}
  .traffic-total{font-size:11px;color:var(--text-faint);margin-top:2px;}
  dialog.overlay-dialog{position:fixed;inset:0;width:100vw;height:100vh;max-width:none;max-height:none;margin:0;padding:20px;border:0;background:rgba(10,10,14,.5);color:var(--text);align-items:center;justify-content:center;overflow-y:auto;}
  dialog.overlay-dialog[open]{display:flex;}
  dialog.overlay-dialog::backdrop{background:transparent;}
  @media(max-width:640px){
    .download-modal{padding:24px;}
    .download-modal .modal-header h2{font-size:24px;}
    .dl-os-row{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;max-width:300px;margin:0 auto 28px;}
    .dl-os{width:100%;}
    .wrap{padding:22px 14px 48px;}
    .brand{font-size:22px;}
    .head-controls{align-items:stretch;}
    .tabs{order:3;width:100%;justify-content:space-between;}
    .tab{flex:1;padding:7px 6px;}
    .row-actions{width:100%;justify-content:flex-end;}
    .traffic-stats{gap:8px;}
    .traffic-stat{min-width:62px;}
  }