```css
*{
  box-sizing:border-box;
  margin:0;
  padding:0;
}

:root{
  font-family:'Space Grotesk',system-ui,sans-serif;

  --bg:#06080d;
  --bg2:#0d1117;
  --card:rgba(13,17,23,.82);

  --text:#eef2f7;
  --muted:#95a1b2;

  --line:rgba(255,255,255,.08);
  --line2:rgba(255,255,255,.12);

  --green:#1fd18b;
  --green2:#0dbf77;
  --green-soft:rgba(31,209,139,.12);
  --green-glow:rgba(31,209,139,.22);

  --danger:#ff6b6b;
}

/* =========================
   BODY LOGIN
========================= */
body{
  min-height:100vh;
  color:var(--text);

  background:
    radial-gradient(circle at top left,
      rgba(31,209,139,.10),
      transparent 25%),
    radial-gradient(circle at top right,
      rgba(31,209,139,.06),
      transparent 22%),
    linear-gradient(
      180deg,
      #05070c 0%,
      #080b12 50%,
      #0d1117 100%
    );

  display:flex;
  align-items:center;
  justify-content:center;
  padding:24px;
  position:relative;
  overflow-x:hidden;
}

body::before{
  content:'';
  position:fixed;
  inset:0;
  pointer-events:none;

  background:
    radial-gradient(circle at 20% 15%,
      rgba(31,209,139,.08),
      transparent 28%),
    radial-gradient(circle at 80% 0%,
      rgba(31,209,139,.06),
      transparent 20%);
}

@media(max-width:640px){
  body{
    padding:16px;
  }
}

/* =========================
   LOGIN CARD
========================= */
.auth-card{
  width:min(460px,100%);
  position:relative;
  z-index:2;

  background:var(--card);

  backdrop-filter:blur(28px);
  -webkit-backdrop-filter:blur(28px);

  border:1px solid rgba(255,255,255,.08);

  border-radius:34px;

  padding:38px;

  box-shadow:
    0 35px 100px rgba(0,0,0,.45);

  overflow:hidden;
}

.auth-card::before{
  content:'';
  position:absolute;
  top:0;
  left:0;
  right:0;
  height:1px;

  background:
    linear-gradient(
      90deg,
      transparent,
      rgba(31,209,139,.45),
      transparent
    );
}

.auth-card header{
  margin-bottom:28px;
}

.tag{
  display:inline-flex;
  align-items:center;
  gap:8px;

  padding:10px 14px;

  border-radius:999px;

  background:var(--green-soft);
  border:1px solid rgba(31,209,139,.18);

  color:var(--green);

  font-size:11px;
  text-transform:uppercase;
  letter-spacing:.18em;
  font-weight:700;

  margin-bottom:18px;
}

.tag::before{
  content:'';
  width:8px;
  height:8px;
  border-radius:50%;

  background:var(--green);

  box-shadow:0 0 16px var(--green);
}

.auth-card h1{
  font-size:36px;
  line-height:1.08;
  letter-spacing:-.04em;
  margin-bottom:12px;
  font-weight:700;
}

.subtitle{
  font-size:14px;
  line-height:1.6;
  color:var(--muted);
}

/* =========================
   TABS
========================= */
.tabs{
  display:flex;
  gap:8px;

  background:rgba(255,255,255,.04);
  border:1px solid rgba(255,255,255,.06);

  border-radius:999px;

  padding:6px;

  margin-bottom:22px;

  position:relative;
  z-index:5;
}

.tab-btn{
  flex:1;

  border:none;

  background:transparent;
  color:#aeb7c4;

  padding:14px 18px;

  border-radius:999px;

  font-weight:700;
  font-size:14px;

  transition:.22s ease;

  pointer-events:auto;
}

.tab-btn:hover{
  color:#fff;
}

.tab-btn.active{
  background:
    linear-gradient(
      180deg,
      rgba(31,209,139,.22),
      rgba(31,209,139,.12)
    );

  border:1px solid rgba(31,209,139,.18);

  color:var(--green);

  box-shadow:
    inset 0 1px 0 rgba(255,255,255,.06),
    0 0 25px rgba(31,209,139,.08);
}

/* =========================
   FORMS
========================= */
.form{
  display:none;
  flex-direction:column;
  gap:18px;
}

.form.active{
  display:flex;
}

label{
  display:flex;
  flex-direction:column;
  gap:8px;

  font-size:13px;
  font-weight:600;

  color:#d6dce6;
}

/* =========================
   INPUTS
========================= */
input{
  background:
    linear-gradient(
      180deg,
      rgba(255,255,255,.03),
      rgba(255,255,255,.02)
    );

  border:1px solid rgba(255,255,255,.08);

  color:var(--text);

  padding:16px 18px;

  border-radius:18px;

  font-size:15px;

  transition:.22s ease;
}

input::placeholder{
  color:#667080;
}

input:hover{
  border-color:rgba(255,255,255,.14);
}

input:focus{
  outline:none;

  border-color:rgba(31,209,139,.55);

  box-shadow:
    0 0 0 4px rgba(31,209,139,.08),
    0 0 35px rgba(31,209,139,.10);

  background:rgba(255,255,255,.04);
}

/* =========================
   BUTTONS
========================= */
.btn{
  border:none;

  border-radius:18px;

  padding:16px 20px;

  font-weight:800;
  font-size:15px;

  text-align:center;

  transition:.22s ease;
}

.btn.primary,
.btn.secondary{
  background:
    linear-gradient(
      180deg,
      var(--green),
      var(--green2)
    );

  color:#05110b;

  box-shadow:
    0 12px 40px rgba(31,209,139,.18);
}

.btn:hover{
  transform:translateY(-2px);

  box-shadow:
    0 18px 50px rgba(31,209,139,.22);
}

.btn:active{
  transform:translateY(0);
}

.btn.danger{
  background:var(--danger);
  color:#fff;
}

/* =========================
   FEEDBACK
========================= */
.feedback{
  margin-top:18px;
  min-height:20px;

  font-size:13px;
  font-weight:600;

  color:#f5c451;
}

.feedback.error{
  color:#ff7b7b;
}

.feedback.success{
  color:var(--green);
}

/* =========================
   DASHBOARD
========================= */
.dashboard-body{
  background:#020617;
  color:#cbd5f5;
  min-height:100vh;
}

.dashboard-header{
  display:flex;
  justify-content:space-between;
  align-items:center;

  padding:32px;

  background:rgba(15,23,42,.85);

  backdrop-filter:blur(30px);

  border-bottom:1px solid rgba(148,163,184,.2);
}

.dashboard-header .tag{
  color:var(--green);
}

.dashboard-header h1{
  font-size:32px;
}

.dashboard-header .subtitle{
  color:#94a3b8;
}

.dashboard-content{
  padding:32px;
  display:flex;
  flex-direction:column;
  gap:20px;
}

.card{
  background:rgba(15,23,42,.7);

  border:1px solid rgba(148,163,184,.15);

  border-radius:24px;

  padding:24px;
}

.card.grid{
  display:grid;
  grid-template-columns:
  repeat(auto-fit,minmax(220px,1fr));

  gap:20px;
}

.card h2,
.card h3{
  margin-bottom:10px;
}

@media(max-width:720px){

  .auth-card{
    padding:28px 22px;
    border-radius:28px;
  }

  .auth-card h1{
    font-size:30px;
  }

  .dashboard-header{
    flex-direction:column;
    gap:16px;
  }
}
```