:root {
  --bg-gradient: linear-gradient(135deg, #0f172a 0%, #1e1b4b 50%, #0f172a 100%);
  --card-bg: rgba(30, 41, 59, 0.75);
  --card-border: rgba(255, 255, 255, 0.12);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-glow: rgba(99, 102, 241, 0.35);
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

body {
  min-height: 100vh;
  background: var(--bg-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-main);
  padding: 1.5rem;
}

.auth-wrapper {
  width: 100%;
  max-width: 440px;
}

.auth-card {
  background: var(--card-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--card-border);
  border-radius: 1.25rem;
  padding: 2.25rem;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5), 0 0 40px var(--primary-glow);
  position: relative;
  overflow: hidden;
}

.auth-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #6366f1, #a855f7, #ec4899);
}

.brand-header {
  text-align: center;
  margin-bottom: 2rem;
}

.brand-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.2), rgba(168, 85, 247, 0.2));
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 1rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.85rem;
  color: #a855f7;
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
}

.brand-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  background: linear-gradient(to right, #ffffff, #cbd5e1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-subtitle {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-top: 0.35rem;
}

/* Tabs */
.auth-tabs {
  display: flex;
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 0.75rem;
  padding: 0.25rem;
  margin-bottom: 1.75rem;
}

.tab-btn {
  flex: 1;
  background: none;
  border: none;
  color: var(--text-muted);
  padding: 0.65rem 0.5rem;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  border-radius: 0.5rem;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
}

.tab-btn:hover {
  color: #f1f5f9;
}

.tab-btn.active {
  background: var(--primary);
  color: #ffffff;
  box-shadow: 0 4px 12px var(--primary-glow);
}

/* Panel Sections */
.tab-content {
  display: none;
}
.tab-content.active {
  display: block;
}

/* QR Code Section */
.qr-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1rem 0;
}

.qr-box {
  width: 220px;
  height: 220px;
  background: #ffffff;
  border-radius: 1rem;
  padding: 12px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.35);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.qr-overlay {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.92);
  border-radius: 1rem;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  color: #f8fafc;
  cursor: pointer;
}

.qr-status-text {
  margin-top: 1.25rem;
  font-size: 0.875rem;
  color: var(--text-muted);
  text-align: center;
  min-height: 24px;
}

/* Push Section */
.push-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 1rem 0;
}

.pulse-circle {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: rgba(99, 102, 241, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  margin-bottom: 1.25rem;
  position: relative;
}

.pulse-circle::after {
  content: "";
  position: absolute;
  inset: -8px;
  border-radius: 50%;
  border: 2px solid var(--primary);
  opacity: 0.6;
  animation: pulse-ring 2s infinite ease-out;
}

@keyframes pulse-ring {
  0% { transform: scale(0.9); opacity: 0.8; }
  100% { transform: scale(1.3); opacity: 0; }
}

.verify-badge {
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid var(--card-border);
  border-radius: 0.75rem;
  padding: 0.75rem 1.5rem;
  margin: 1rem 0;
  display: inline-block;
}

.verify-code {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.35em;
  color: #38bdf8;
  font-family: monospace;
}

/* Form inputs */
.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.825rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

.input-field {
  width: 100%;
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 0.625rem;
  padding: 0.75rem 1rem;
  font-size: 0.95rem;
  color: #ffffff;
  outline: none;
  transition: all 0.2s;
}

.input-field:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

.btn-primary {
  width: 100%;
  background: linear-gradient(135deg, var(--primary), #8b5cf6);
  color: #ffffff;
  border: none;
  padding: 0.85rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 0.625rem;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: 0 4px 14px var(--primary-glow);
}

.btn-primary:hover {
  opacity: 0.92;
  transform: translateY(-1px);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.08);
  color: #cbd5e1;
  border: 1px solid rgba(255, 255, 255, 0.12);
  padding: 0.6rem 1.25rem;
  border-radius: 0.5rem;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.15);
  color: #ffffff;
}

.notice-box {
  margin-top: 1.5rem;
  padding: 0.85rem;
  background: rgba(15, 23, 42, 0.4);
  border: 1px dashed rgba(255, 255, 255, 0.1);
  border-radius: 0.625rem;
  font-size: 0.785rem;
  color: var(--text-muted);
  line-height: 1.4;
  text-align: center;
}