:root {
  --auth-card: rgba(16, 25, 40, 0.72);
  --auth-card-2: rgba(12, 18, 32, 0.72);
  --auth-border: rgba(148, 163, 184, 0.14);
  --auth-glow: rgba(59, 130, 246, 0.22);
}

.auth-shell {
  min-height: 100vh;
  background:
    radial-gradient(900px 650px at 10% 10%, rgba(59,130,246,.16), transparent 55%),
    radial-gradient(800px 600px at 90% 30%, rgba(34,197,94,.10), transparent 55%),
    radial-gradient(700px 550px at 60% 95%, rgba(59,130,246,.10), transparent 55%),
    linear-gradient(180deg, var(--bg) 0%, #04060c 100%);
  padding: 96px 0 56px;
}

.auth-topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(5, 8, 15, 0.86);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(20px);
}
.auth-topbar-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.auth-topbar a { text-decoration: none; }
.auth-topbar-right {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-3);
  font-size: 0.86rem;
}
.auth-topbar-right a {
  color: var(--text);
  border: 1px solid var(--auth-border);
  padding: 8px 14px;
  border-radius: var(--r);
  background: rgba(16,25,40,.35);
  transition: border-color .18s, transform .18s;
}
.auth-topbar-right a:hover {
  border-color: rgba(59,130,246,.35);
  transform: translateY(-1px);
}

.auth-grid {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 22px;
  align-items: start;
}

.auth-left {
  border: 1px solid var(--auth-border);
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(16,25,40,.55), rgba(12,18,32,.35));
  box-shadow: 0 0 0 1px rgba(255,255,255,.02) inset, 0 30px 80px rgba(0,0,0,.55);
  padding: 36px 34px;
  overflow: hidden;
  position: relative;
}
.auth-left::before {
  content: '';
  position: absolute;
  inset: -2px;
  background: radial-gradient(500px 300px at 20% 10%, rgba(59,130,246,.24), transparent 60%);
  pointer-events: none;
}

.auth-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-lt);
  background: rgba(59,130,246,.12);
  border: 1px solid rgba(59,130,246,.22);
  padding: 6px 12px;
  border-radius: 999px;
  position: relative;
  z-index: 1;
}
.auth-kicker .dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 0 rgba(59,130,246,.4);
  animation: authPing 2.1s ease-in-out infinite;
}
@keyframes authPing {
  0%,100% { box-shadow: 0 0 0 0 rgba(59,130,246,.45); }
  60%     { box-shadow: 0 0 0 7px rgba(59,130,246,0); }
}

.auth-title {
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 4.5vw, 3rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-top: 18px;
  margin-bottom: 12px;
  position: relative;
  z-index: 1;
}
.auth-subtitle {
  color: var(--text-2);
  font-size: 0.98rem;
  line-height: 1.8;
  max-width: 52ch;
  position: relative;
  z-index: 1;
}

.auth-benefits {
  margin-top: 22px;
  display: grid;
  gap: 10px;
  position: relative;
  z-index: 1;
}
.auth-benefit {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid rgba(148,163,184,.14);
  background: rgba(5,8,15,.24);
}
.auth-benefit svg { width: 18px; height: 18px; color: var(--green); margin-top: 2px; flex-shrink: 0; }
.auth-benefit strong { display: block; font-size: 0.9rem; color: var(--text); }
.auth-benefit span { display: block; font-size: 0.82rem; color: var(--text-2); line-height: 1.6; margin-top: 3px; }

.auth-card {
  border: 1px solid var(--auth-border);
  border-radius: 18px;
  background: linear-gradient(180deg, var(--auth-card), var(--auth-card-2));
  box-shadow: 0 0 0 1px rgba(255,255,255,.02) inset, 0 30px 80px rgba(0,0,0,.55);
  padding: 30px 28px 24px;
  position: sticky;
  top: 92px;
}

.auth-card h2 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  font-size: 1.25rem;
  margin-bottom: 6px;
}
.auth-card p {
  color: var(--text-2);
  font-size: 0.86rem;
  line-height: 1.7;
  margin-bottom: 18px;
}

.auth-form {
  display: grid;
  gap: 14px;
}

.auth-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.auth-field label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 10px;
  font-size: 0.78rem;
  font-weight: 650;
  color: var(--text-2);
  margin-bottom: 7px;
  letter-spacing: 0.02em;
}
.auth-field label .hint { color: var(--text-3); font-weight: 500; font-size: 0.72rem; }

.auth-field input,
.auth-field select {
  width: 100%;
  background: rgba(5, 8, 15, 0.65);
  border: 1px solid rgba(148,163,184,.18);
  border-radius: 14px;
  padding: 12px 14px;
  color: var(--text);
  outline: none;
  transition: border-color .18s, box-shadow .18s, transform .18s;
}
.auth-field input:focus,
.auth-field select:focus {
  border-color: rgba(59,130,246,.55);
  box-shadow: 0 0 0 4px rgba(59,130,246,.13);
}
.auth-field input.invalid,
.auth-field select.invalid {
  border-color: rgba(239,68,68,.7);
  box-shadow: 0 0 0 4px rgba(239,68,68,.12);
}

.auth-error {
  display: none;
  margin-top: 7px;
  font-size: 0.76rem;
  color: #fca5a5;
}
.auth-error.visible { display: block; }

.auth-tos {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 12px 12px;
  border-radius: 14px;
  border: 1px solid rgba(148,163,184,.14);
  background: rgba(5,8,15,.24);
}
.auth-tos input { margin-top: 2px; }
.auth-tos span {
  color: var(--text-2);
  font-size: 0.82rem;
  line-height: 1.55;
}
.auth-tos a { color: var(--accent-lt); text-decoration: underline; text-underline-offset: 2px; }

.auth-submit {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 8px;
}
.auth-submit button {
  flex: 1;
  display: inline-flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  background: linear-gradient(180deg, rgba(59,130,246,1), rgba(37,99,235,1));
  color: #fff;
  border: 1px solid rgba(59,130,246,.45);
  border-radius: 14px;
  padding: 13px 14px;
  font-weight: 800;
  letter-spacing: 0.01em;
  transition: transform .18s, box-shadow .18s;
  box-shadow: 0 18px 40px rgba(59,130,246,.18);
}
.auth-submit button:hover { transform: translateY(-1px); box-shadow: 0 22px 52px rgba(59,130,246,.22); }
.auth-submit button:disabled { opacity: 0.7; cursor: not-allowed; transform: none; }
.auth-submit .mini {
  font-size: 0.78rem;
  color: var(--text-3);
  line-height: 1.5;
}

.auth-banner {
  display: none;
  margin-top: 12px;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid rgba(148,163,184,.14);
  background: rgba(5,8,15,.28);
  color: var(--text-2);
  font-size: 0.86rem;
  line-height: 1.6;
}
.auth-banner.ok { border-color: rgba(34,197,94,.25); background: rgba(34,197,94,.08); color: #bbf7d0; }
.auth-banner.err { border-color: rgba(239,68,68,.25); background: rgba(239,68,68,.08); color: #fecaca; }
.auth-banner.visible { display: block; }

#verifyBanner button {
  padding: 10px 14px;
  border-radius: 14px;
  border: 1px solid rgba(148,163,184,.18);
  background: rgba(5,8,15,.35);
  color: var(--text);
  font-weight: 750;
  transition: border-color .18s, transform .18s;
}
#verifyBanner button:hover {
  border-color: rgba(59,130,246,.35);
  transform: translateY(-1px);
}

.captcha-slot {
  border: 1px dashed rgba(148,163,184,.22);
  border-radius: 14px;
  padding: 12px;
  background: rgba(5,8,15,.20);
}
.captcha-note {
  font-size: 0.78rem;
  color: var(--text-3);
  line-height: 1.55;
  margin-top: 8px;
}

@media (max-width: 980px) {
  .auth-grid { grid-template-columns: 1fr; }
  .auth-card { position: relative; top: 0; }
}
@media (max-width: 520px) {
  .auth-row { grid-template-columns: 1fr; }
  .auth-left { padding: 28px 18px; }
  .auth-card { padding: 22px 16px; }
}