/* ---------- fonts ---------- */
  @font-face{
    font-family:'General Sans';
    font-weight:600;
    font-style:normal;
    font-display:swap;
    src:url('../fonts/general-sans-600.woff2') format('woff2');
  }
  @font-face{
    font-family:'General Sans';
    font-weight:700;
    font-style:normal;
    font-display:swap;
    src:url('../fonts/general-sans-700.woff2') format('woff2');
  }
  @font-face{
    font-family:'IBM Plex Sans';
    font-weight:400 700;
    font-style:normal;
    font-display:swap;
    src:url('../fonts/plex-sans-variable.woff2') format('woff2');
  }
  @font-face{
    font-family:'IBM Plex Mono';
    font-weight:400;
    font-style:normal;
    font-display:swap;
    src:url('../fonts/plex-mono-400.woff2') format('woff2');
  }
  @font-face{
    font-family:'IBM Plex Mono';
    font-weight:500;
    font-style:normal;
    font-display:swap;
    src:url('../fonts/plex-mono-500.woff2') format('woff2');
  }

  /* ---------- tokens (single committed dark brand world) ---------- */
  :root{
    --ink:        #0A0E15;
    --charcoal:   #111827;
    --charcoal-2: #171F30;
    --charcoal-3: #1E2739;
    --green:      #25D366;
    --green-deep: #128C4A;
    --green-glow: rgba(37,211,102,.38);
    --paper:      #F6F8FB;
    --text:       #F3F5F9;
    --mist:       #9AA4BC;
    --mist-dim:   #6F7A93;
    --line:       rgba(233,238,247,.10);
    --line-soft:  rgba(233,238,247,.06);
    --glass:      rgba(23,31,48,.62);
    --glass-hi:   rgba(255,255,255,.05);

    --font-display:'General Sans', ui-sans-serif, system-ui, sans-serif;
    --font-body:'IBM Plex Sans', ui-sans-serif, system-ui, sans-serif;
    --font-mono:'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

    --radius-lg: 22px;
    --radius-md: 13px;
    --radius-sm: 9px;
  }

  *{ box-sizing:border-box; }
  html,body{ height:100%; }
  body{
    margin:0;
    background:var(--ink);
    color:var(--text);
    font-family:var(--font-body);
    -webkit-font-smoothing:antialiased;
    text-rendering:optimizeLegibility;
    overflow-x:hidden;
  }
  ::selection{ background:var(--green); color:var(--ink); }
  a{ color:inherit; }
  button{ font-family:inherit; }

  :focus-visible{
    outline:2px solid var(--green);
    outline-offset:2px;
    border-radius:6px;
  }

  /* ---------- stage ---------- */
  .stage{
    min-height:100vh;
    display:flex;
    background:var(--ink);
  }

  /* ===== left: brand panel ===== */
  .brand-panel{
    position:relative;
    flex:1.15;
    min-width:0;
    overflow:hidden;
    display:flex;
    flex-direction:column;
    justify-content:space-between;
    padding:clamp(26px,3.6vw,60px);
    background:
      radial-gradient(120% 140% at 14% -10%, #1B2745 0%, transparent 55%),
      radial-gradient(90% 110% at 100% 115%, #0F2B24 0%, transparent 50%),
      linear-gradient(180deg, var(--charcoal) 0%, var(--ink) 100%);
  }
  #network{
    position:absolute;
    inset:0;
    width:100%;
    height:100%;
    display:block;
    opacity:.9;
  }
  .brand-panel::after{
    content:'';
    position:absolute; inset:0;
    background:
      radial-gradient(60% 50% at 78% 30%, rgba(37,211,102,.10), transparent 70%),
      linear-gradient(180deg, rgba(10,14,21,0) 0%, rgba(10,14,21,.55) 100%);
    pointer-events:none;
  }

  .brand-top, .brand-bottom, .stage-cards{ position:relative; z-index:2; }

  .brand-top{ display:flex; align-items:center; gap:12px; }
  .mark{
    width:38px; height:38px; border-radius:11px;
    background:linear-gradient(145deg, var(--charcoal-3), var(--charcoal-2));
    border:1px solid var(--line);
    display:flex; align-items:center; justify-content:center;
    box-shadow:0 8px 20px -8px rgba(0,0,0,.6);
  }
  .wordmark{
    font-family:var(--font-display);
    font-weight:700;
    font-size:1.02rem;
    letter-spacing:.045em;
    color:var(--text);
  }
  .wordmark b{ color:var(--green); font-weight:700; }

  .stage-cards{
    flex:1;
    display:flex;
    align-items:center;
    justify-content:center;
    min-height:220px;
  }

  .float-chip{
    position:absolute;
    width:34px; height:34px;
    border-radius:50%;
    background:var(--glass);
    border:1px solid var(--line);
    backdrop-filter:blur(10px);
    display:flex; align-items:center; justify-content:center;
    box-shadow:0 10px 24px -10px rgba(0,0,0,.65);
    animation:drift 7s ease-in-out infinite;
  }
  .float-chip.c1{ top:12%; left:20%; animation-delay:0s; }
  .float-chip.c2{ bottom:16%; right:14%; animation-delay:1.4s; width:26px; height:26px; }
  .float-chip.c3{ top:52%; left:6%; animation-delay:2.6s; width:22px; height:22px; }
  @keyframes drift{
    0%,100%{ transform:translateY(0); }
    50%{ transform:translateY(-10px); }
  }

  .chat-card{
    position:absolute;
    top:13%;
    right:9%;
    width:min(272px, 58%);
    background:var(--glass);
    backdrop-filter:blur(18px);
    border:1px solid var(--line);
    border-radius:var(--radius-md);
    padding:14px 14px 12px;
    box-shadow:0 30px 60px -24px rgba(0,0,0,.75);
    transform:rotate(1.4deg);
  }
  .chat-card__head{
    display:flex; align-items:center; gap:8px;
    padding-bottom:10px; margin-bottom:10px;
    border-bottom:1px solid var(--line-soft);
  }
  .chat-avatar{
    width:24px; height:24px; border-radius:50%;
    background:linear-gradient(145deg, var(--green), var(--green-deep));
    flex:none;
  }
  .chat-card__name{ font-size:.76rem; font-weight:600; }
  .chat-card__status{
    font-family:var(--font-mono);
    font-size:.6rem;
    color:var(--green);
    letter-spacing:.03em;
  }
  .bubble{
    font-size:.74rem;
    line-height:1.4;
    padding:8px 10px;
    border-radius:10px;
    max-width:88%;
    margin-bottom:6px;
  }
  .bubble.in{
    background:rgba(255,255,255,.06);
    color:var(--text);
    border-top-left-radius:3px;
  }
  .bubble.out{
    background:linear-gradient(135deg, rgba(37,211,102,.24), rgba(18,140,74,.20));
    color:#EAFBF1;
    margin-left:auto;
    border-top-right-radius:3px;
  }
  .bubble .tick{ color:var(--green); font-size:.62rem; margin-left:4px; }

  .stat-card{
    position:absolute;
    bottom:14%;
    left:7%;
    width:min(228px, 56%);
    background:var(--glass);
    backdrop-filter:blur(18px);
    border:1px solid var(--line);
    border-radius:var(--radius-md);
    padding:14px;
    box-shadow:0 30px 60px -24px rgba(0,0,0,.75);
    transform:rotate(-2deg);
  }
  .stat-card__label{
    font-family:var(--font-mono);
    font-size:.6rem;
    text-transform:uppercase;
    letter-spacing:.1em;
    color:var(--mist);
    margin-bottom:8px;
  }
  .stat-row{
    display:flex; align-items:baseline; justify-content:space-between;
    padding:5px 0;
    border-bottom:1px solid var(--line-soft);
    font-size:.76rem;
  }
  .stat-row:last-child{ border-bottom:none; }
  .stat-row .num{
    font-family:var(--font-mono);
    font-variant-numeric:tabular-nums;
    color:var(--text);
    font-weight:500;
  }
  .stat-row .num.up{ color:var(--green); }
  .spark{ display:block; margin-top:10px; }

  .brand-bottom{ max-width:50ch; }
  .eyebrow{
    font-family:var(--font-mono);
    font-size:.68rem;
    text-transform:uppercase;
    letter-spacing:.16em;
    color:var(--green);
    margin-bottom:14px;
  }
  .slogan{
    font-family:var(--font-display);
    font-weight:700;
    font-size:clamp(1.7rem, 2.7vw, 2.5rem);
    line-height:1.12;
    letter-spacing:-.01em;
    text-wrap:balance;
    margin:0;
  }
  .subcopy{
    margin:14px 0 0;
    color:var(--mist);
    font-size:.92rem;
    line-height:1.6;
    max-width:42ch;
  }

  /* ===== right: auth panel ===== */
  .auth-panel{
    flex:1;
    min-width:0;
    position:relative;
    display:flex;
    align-items:center;
    justify-content:center;
    padding:32px 28px;
    background:
      radial-gradient(70% 60% at 50% 0%, #141B2B 0%, transparent 60%),
      var(--charcoal);
  }

  .lang-toggle{
    position:absolute;
    top:26px; right:28px;
    display:flex;
    gap:2px;
    padding:3px;
    border-radius:999px;
    background:rgba(255,255,255,.04);
    border:1px solid var(--line);
    font-family:var(--font-mono);
    font-size:.68rem;
    letter-spacing:.04em;
  }
  .lang-toggle button{
    border:none;
    background:transparent;
    color:var(--mist);
    padding:6px 11px;
    border-radius:999px;
    cursor:pointer;
    transition:background .15s ease, color .15s ease;
  }
  .lang-toggle button[aria-pressed="true"]{
    background:var(--green);
    color:#06210F;
    font-weight:500;
  }

  .card{
    width:100%;
    max-width:398px;
    background:var(--glass);
    backdrop-filter:blur(22px);
    -webkit-backdrop-filter:blur(22px);
    border:1px solid var(--line);
    border-radius:var(--radius-lg);
    padding:38px 34px 28px;
    box-shadow:
      0 40px 80px -30px rgba(0,0,0,.8),
      0 0 0 1px rgba(255,255,255,.02) inset;
  }

  .card-brand{ display:flex; flex-direction:column; gap:16px; margin-bottom:26px; }
  .card-brand .mark{ width:44px; height:44px; border-radius:13px; }
  .card-logo-row{ display:flex; align-items:center; gap:12px; }
  .card h1{
    margin:0;
    font-family:var(--font-display);
    font-weight:700;
    font-size:1.26rem;
    letter-spacing:.03em;
  }
  .card h1 b{ color:var(--green); }
  .card .subtitle{
    margin:0;
    font-family:var(--font-mono);
    font-size:.7rem;
    text-transform:uppercase;
    letter-spacing:.09em;
    color:var(--mist);
  }

  form{ display:flex; flex-direction:column; gap:16px; }
  .field{ display:flex; flex-direction:column; gap:7px; }
  .field label{
    font-size:.78rem;
    font-weight:500;
    color:var(--mist);
  }
  .field-input{ position:relative; display:flex; align-items:center; }
  .field-input svg.icon{
    position:absolute; left:13px;
    width:16px; height:16px;
    color:var(--mist-dim);
    pointer-events:none;
  }
  .field-input input{
    width:100%;
    background:rgba(255,255,255,.035);
    border:1px solid var(--line);
    color:var(--text);
    font-family:var(--font-body);
    font-size:.9rem;
    border-radius:var(--radius-sm);
    padding:11.5px 14px 11.5px 39px;
    transition:border-color .15s ease, background .15s ease;
  }
  .field-input input::placeholder{ color:var(--mist-dim); }
  .field-input input:hover{ border-color:rgba(233,238,247,.2); }
  .field-input input:focus{
    outline:none;
    border-color:var(--green);
    background:rgba(37,211,102,.05);
    box-shadow:0 0 0 3px rgba(37,211,102,.14);
  }
  .field-input.has-toggle input{ padding-right:40px; }
  .pw-toggle{
    position:absolute; right:8px;
    width:28px; height:28px;
    display:flex; align-items:center; justify-content:center;
    background:transparent; border:none; cursor:pointer;
    color:var(--mist-dim); border-radius:7px;
  }
  .pw-toggle:hover{ color:var(--mist); background:rgba(255,255,255,.05); }
  .pw-toggle svg{ width:16px; height:16px; }

  .row-between{
    display:flex; align-items:center; justify-content:space-between;
    font-size:.8rem;
    margin-top:-2px;
  }
  .remember{ display:flex; align-items:center; gap:8px; cursor:pointer; color:var(--mist); user-select:none; }
  .remember input{ position:absolute; opacity:0; width:16px; height:16px; }
  .check-box{
    width:16px; height:16px; border-radius:5px;
    border:1.4px solid rgba(233,238,247,.28);
    background:rgba(255,255,255,.03);
    display:flex; align-items:center; justify-content:center;
    flex:none;
    transition:background .15s ease, border-color .15s ease;
  }
  .remember input:checked + .check-box{
    background:var(--green);
    border-color:var(--green);
  }
  .check-box svg{ width:10px; height:10px; opacity:0; transition:opacity .1s ease; color:#06210F; }
  .remember input:checked + .check-box svg{ opacity:1; }
  .remember input:focus-visible + .check-box{ outline:2px solid var(--green); outline-offset:2px; }

  .forgot{
    color:var(--mist);
    text-decoration:none;
    border-bottom:1px solid transparent;
  }
  .forgot:hover{ color:var(--text); border-color:var(--line); }

  .btn-primary{
    margin-top:4px;
    width:100%;
    border:none;
    border-radius:var(--radius-sm);
    padding:13px 16px;
    background:linear-gradient(135deg, var(--green) 0%, var(--green-deep) 100%);
    color:#06210F;
    font-family:var(--font-body);
    font-weight:600;
    font-size:.92rem;
    letter-spacing:.01em;
    cursor:pointer;
    box-shadow:0 16px 30px -12px var(--green-glow);
    transition:transform .12s ease, box-shadow .12s ease, filter .12s ease;
  }
  .btn-primary:hover{ filter:brightness(1.05); transform:translateY(-1px); box-shadow:0 20px 36px -12px var(--green-glow); }
  .btn-primary:active{ transform:translateY(0); }

  .divider{
    display:flex; align-items:center; gap:12px;
    color:var(--mist-dim);
    font-family:var(--font-mono);
    font-size:.65rem;
    text-transform:uppercase;
    letter-spacing:.1em;
    margin:6px 0 2px;
  }
  .divider::before, .divider::after{
    content:''; flex:1; height:1px; background:var(--line);
  }

  .sso-row{ display:flex; gap:10px; }
  .btn-sso{
    flex:1;
    display:flex; align-items:center; justify-content:center; gap:9px;
    background:rgba(255,255,255,.03);
    border:1px solid var(--line);
    color:var(--text);
    text-decoration:none;
    border-radius:var(--radius-sm);
    padding:10.5px 10px;
    font-size:.82rem;
    font-weight:500;
    cursor:pointer;
    transition:background .15s ease, border-color .15s ease;
  }
  .btn-sso:hover{ background:rgba(255,255,255,.06); border-color:rgba(233,238,247,.22); }
  .btn-sso svg{ width:16px; height:16px; flex:none; }

  .card-footer{
    margin-top:26px;
    padding-top:18px;
    border-top:1px solid var(--line-soft);
    display:flex; align-items:center; justify-content:space-between;
    font-family:var(--font-mono);
    font-size:.66rem;
    color:var(--mist-dim);
    letter-spacing:.02em;
  }

  .legal-footer{
    display:flex; align-items:center; justify-content:center; gap:8px;
    margin-top:12px;
    font-size:.72rem;
    color:var(--mist-dim);
  }
  .legal-footer a{ color:var(--mist-dim); text-decoration:none; }
  .legal-footer a:hover{ color:var(--text); text-decoration:underline; }

  /* ---------- responsive ---------- */
  @media (max-width:940px){
    .stage{ flex-direction:column; }
    .brand-panel{ min-height:300px; padding:22px 22px 28px; }
    .stat-card{ display:none; }
    .chat-card{ top:16%; right:6%; }
    .brand-bottom .subcopy{ display:none; }
    .auth-panel{ padding:26px 18px 40px; }
    .lang-toggle{ top:18px; right:18px; }
  }
  @media (max-width:480px){
    .card{ padding:30px 22px 22px; border-radius:18px; }
    .chat-card{ display:none; }
    .brand-panel{ min-height:180px; }
    .eyebrow{ margin-bottom:8px; }
  }

  @media (prefers-reduced-motion:reduce){
    .float-chip{ animation:none; }
    .btn-primary, .btn-sso, .field-input input{ transition:none; }
  }

  /* ---------- server-side validation / session status ---------- */
  .field-input.has-error input{
    border-color:#F2545B;
    background:rgba(242,84,91,.06);
  }
  .field-error{
    font-size:.72rem;
    color:#F2777D;
    margin-top:1px;
  }
  .status-banner{
    display:flex;
    align-items:center;
    gap:8px;
    background:rgba(37,211,102,.1);
    border:1px solid rgba(37,211,102,.3);
    color:#BFF3D3;
    font-size:.8rem;
    border-radius:var(--radius-sm);
    padding:10px 12px;
    margin-bottom:18px;
  }