:root {
  color-scheme: dark;
  --bg-0: #030913;
  --bg-1: #071429;
  --panel: rgba(9, 19, 38, 0.86);
  --border: rgba(117, 166, 242, 0.22);
  --text: #eaf2ff;
  --muted: #9eb2d3;
  --ok: #86efac;
  --err: #fda4af;
  --primary: #60a5fa;
  --primary-2: #3b82f6;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: 'Inter', 'SF Pro Text', 'Segoe UI', system-ui, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 20% 10%, rgba(74, 144, 255, 0.2), transparent 42%),
    radial-gradient(circle at 80% 0%, rgba(96, 165, 250, 0.17), transparent 40%),
    linear-gradient(180deg, var(--bg-1), var(--bg-0));
}

.auth-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 28px;
}

.auth-shell {
  width: min(680px, 100%);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 26px;
  box-shadow:
    0 24px 50px rgba(2, 8, 20, 0.55),
    inset 0 1px 0 rgba(255, 255, 255, 0.04);
  backdrop-filter: blur(10px);
}

.auth-head h1 {
  margin: 0;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
}

.auth-kicker {
  margin: 0 0 8px;
  font-weight: 700;
  color: var(--primary);
}

.auth-subtitle {
  margin: 10px 0 0;
  color: var(--muted);
  line-height: 1.45;
}

.auth-tabs {
  margin-top: 18px;
  display: inline-grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  background: rgba(8, 14, 28, 0.72);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 6px;
}

.tab {
  border: 0;
  border-radius: 8px;
  padding: 10px 14px;
  background: transparent;
  color: var(--muted);
  font-weight: 700;
  cursor: pointer;
}

.tab.active {
  background: linear-gradient(180deg, rgba(96, 165, 250, 0.28), rgba(59, 130, 246, 0.24));
  color: var(--text);
}

.auth-form {
  margin-top: 16px;
}

.stack {
  display: grid;
  gap: 12px;
}

label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 0.95rem;
}

input {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 11px;
  background: #0a1730;
  color: var(--text);
  padding: 12px 13px;
  font: inherit;
  outline: none;
}

input:focus {
  border-color: rgba(124, 178, 255, 0.72);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

button {
  font: inherit;
}

#auth-submit {
  border: 0;
  border-radius: 12px;
  background: linear-gradient(90deg, var(--primary), var(--primary-2));
  color: #041126;
  font-weight: 800;
  padding: 12px 16px;
  cursor: pointer;
}

#auth-submit:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.msg {
  margin: 0;
  min-height: 1.2em;
  color: var(--muted);
}

.auth-switch {
  margin: 14px 0 0;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

.link-btn {
  border: 0;
  background: transparent;
  color: var(--primary);
  font-weight: 700;
  cursor: pointer;
  padding: 0;
}

.link-btn:hover {
  color: #93c5fd;
}

.hidden {
  display: none !important;
}

@media (max-width: 760px) {
  .auth-page {
    padding: 18px;
  }

  .auth-shell {
    padding: 18px;
    border-radius: 14px;
  }

  .auth-switch {
    flex-wrap: wrap;
  }
}