:root {
  --bg-void: #06070a;
  --bg-base: #0b0d12;
  --bg-surface: #12151c;
  --bg-surface-2: #171b24;
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.14);
  --text-primary: #f4f6fb;
  --text-secondary: #a6adbb;
  --text-muted: #6b7180;
  --accent-a: #7c5cff;
  --accent-b: #22d3ee;
  --gradient-brand: linear-gradient(135deg, var(--accent-a) 0%, var(--accent-b) 100%);
  --gradient-glow: radial-gradient(circle at 30% 20%, rgba(124, 92, 255, 0.35), transparent 55%),
                   radial-gradient(circle at 80% 0%, rgba(34, 211, 238, 0.25), transparent 50%);
  --radius-sm: 8px;
  --radius-lg: 22px;
  --shadow-soft: 0 20px 60px rgba(0, 0, 0, 0.45);
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg-base);
  color: var(--text-primary);
  min-height: 100vh;
}

.glow-backdrop {
  position: fixed;
  inset: 0;
  z-index: -1;
  background: var(--bg-void);
  background-image: var(--gradient-glow);
}

.flash-container {
  position: fixed;
  top: 16px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: min(92vw, 420px);
}

.flash {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  background: var(--bg-surface-2);
  border: 1px solid var(--border-strong);
  box-shadow: var(--shadow-soft);
}

.flash-error { border-color: rgba(255, 95, 95, 0.5); color: #ffb3b3; }
.flash-success { border-color: rgba(80, 220, 150, 0.5); color: #9dffce; }
.flash-info { border-color: rgba(90, 170, 255, 0.5); color: #b7d8ff; }
.flash-warning { border-color: rgba(255, 190, 90, 0.5); color: #ffdca6; }

.auth-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.auth-card {
  width: 100%;
  max-width: 380px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  box-shadow: var(--shadow-soft);
  text-align: center;
}

.auth-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.05rem;
  margin-bottom: 28px;
  color: var(--text-primary);
  text-decoration: none;
}

.brand-mark {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: var(--gradient-brand);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.brand-mark svg { width: 16px; height: 16px; }

.auth-card h1 {
  font-size: 1.5rem;
  margin: 0 0 8px;
  letter-spacing: -0.02em;
}

.auth-subhead {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin: 0 0 28px;
}

.auth-form {
  display: flex;
  flex-direction: column;
  text-align: left;
  gap: 6px;
}

.auth-form label {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-top: 12px;
}

.auth-form label:first-child {
  margin-top: 0;
}

.auth-form input {
  background: var(--bg-surface-2);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: inherit;
  transition: border-color 0.2s ease;
}

.auth-form input:focus {
  outline: none;
  border-color: var(--accent-b);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.92rem;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.15s ease, box-shadow 0.2s ease;
}

.btn-primary {
  background: var(--gradient-brand);
  color: #0b0d12;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(124, 92, 255, 0.35);
}

.auth-submit {
  margin-top: 22px;
  width: 100%;
  padding: 13px 20px;
}

.auth-back {
  display: inline-block;
  margin-top: 24px;
  font-size: 0.85rem;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

.auth-back:hover {
  color: var(--text-primary);
}

@media (max-width: 420px) {
  .auth-card {
    padding: 28px 22px;
  }
}