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

:root {
  --primary: #4F46E5;
  --primary-dark: #4338CA;
  --primary-light: #818CF8;
  --secondary: #7C3AED;
  --accent: #06B6D4;
  --success: #10B981;
  --warning: #F59E0B;
  --danger: #EF4444;
  --dark: #0F172A;
  --dark-2: #1E293B;
  --dark-3: #334155;
  --text: #F8FAFC;
  --text-muted: #94A3B8;
  --border: rgba(255,255,255,0.08);
  --glass: rgba(255,255,255,0.05);
  --glass-hover: rgba(255,255,255,0.08);
  --radius: 12px;
  --radius-lg: 20px;
  --shadow: 0 25px 50px rgba(0,0,0,0.4);
}

body {
  font-family: 'Inter', sans-serif;
  background: var(--dark);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
}

/* ─── Background ─── */
.auth-bg {
  min-height: 100vh;
  background: linear-gradient(135deg, #0F172A 0%, #1E1B4B 50%, #0F172A 100%);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.auth-particles {
  position: fixed;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
}

.auth-particles::before {
  content: '';
  position: absolute;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(79,70,229,0.15) 0%, transparent 70%);
  top: -200px;
  left: -200px;
  animation: float1 8s ease-in-out infinite;
}

.auth-particles::after {
  content: '';
  position: absolute;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(124,58,237,0.12) 0%, transparent 70%);
  bottom: -150px;
  right: -100px;
  animation: float2 10s ease-in-out infinite;
}

@keyframes float1 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(40px, 40px) scale(1.05); }
}

@keyframes float2 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-30px, -30px) scale(1.08); }
}

/* ─── Container ─── */
.auth-container {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 100vh;
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
}

/* ─── Left Panel ─── */
.auth-left {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 60px 80px;
  background: linear-gradient(135deg, rgba(79,70,229,0.1) 0%, rgba(124,58,237,0.05) 100%);
  border-right: 1px solid var(--border);
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 60px;
}

.logo-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 32px rgba(79,70,229,0.4);
}

.brand-name {
  font-size: 24px;
  font-weight: 800;
  background: linear-gradient(135deg, #fff, var(--primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.5px;
}

.auth-hero h1 {
  font-size: 48px;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -1px;
}

.gradient-text {
  background: linear-gradient(135deg, var(--primary-light), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.auth-hero > p {
  font-size: 17px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 48px;
  max-width: 400px;
}

.feature-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.feature-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 24px;
  background: var(--glass);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
}

.feature-item:hover {
  background: var(--glass-hover);
  border-color: rgba(79,70,229,0.3);
  transform: translateX(4px);
}

.feature-icon {
  font-size: 28px;
  width: 52px;
  height: 52px;
  background: linear-gradient(135deg, rgba(79,70,229,0.2), rgba(124,58,237,0.2));
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.feature-item strong {
  display: block;
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 4px;
}

.feature-item p {
  font-size: 13px;
  color: var(--text-muted);
}

/* ─── Right Panel ─── */
.auth-right {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 60px 80px;
}

.auth-card {
  width: 100%;
  max-width: 460px;
  background: rgba(15,23,42,0.8);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px;
  backdrop-filter: blur(20px);
  box-shadow: var(--shadow);
}

/* ─── Tabs ─── */
.auth-tabs {
  display: flex;
  background: var(--dark-2);
  border-radius: 10px;
  padding: 4px;
  margin-bottom: 32px;
}

.tab-btn {
  flex: 1;
  padding: 10px 16px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-family: 'Inter', sans-serif;
  font-size: 14px;
  font-weight: 500;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.tab-btn.active {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
  box-shadow: 0 4px 16px rgba(79,70,229,0.4);
}

/* ─── Form ─── */
.auth-form h2 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 6px;
  letter-spacing: -0.3px;
}

.form-subtitle {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 28px;
  line-height: 1.6;
}

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

.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 8px;
  letter-spacing: 0.2px;
}

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.input-icon {
  position: absolute;
  left: 14px;
  font-size: 16px;
  z-index: 1;
  pointer-events: none;
}

.input-wrapper input {
  width: 100%;
  padding: 12px 14px 12px 44px;
  background: var(--dark-2);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  font-family: 'Inter', sans-serif;
  font-size: 14px;
  transition: all 0.2s ease;
  outline: none;
}

.input-wrapper input:focus {
  border-color: var(--primary);
  background: rgba(79,70,229,0.05);
  box-shadow: 0 0 0 3px rgba(79,70,229,0.1);
}

.input-wrapper input::placeholder {
  color: var(--dark-3);
}

.toggle-pw {
  position: absolute;
  right: 12px;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 16px;
  padding: 4px;
  opacity: 0.6;
  transition: opacity 0.2s;
}

.toggle-pw:hover { opacity: 1; }

/* ─── Form options ─── */
.form-options {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
  cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--primary);
  cursor: pointer;
}

.checkbox-label a {
  color: var(--primary-light);
  text-decoration: none;
}

.forgot-link {
  font-size: 13px;
  color: var(--primary-light);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

.forgot-link:hover { color: white; }

/* ─── Auth Button ─── */
.auth-btn {
  width: 100%;
  padding: 14px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border: none;
  border-radius: 10px;
  color: white;
  font-family: 'Inter', sans-serif;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 20px rgba(79,70,229,0.4);
  position: relative;
  overflow: hidden;
}

.auth-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.15), transparent);
  opacity: 0;
  transition: opacity 0.3s;
}

.auth-btn:hover::before { opacity: 1; }
.auth-btn:hover { transform: translateY(-1px); box-shadow: 0 8px 28px rgba(79,70,229,0.5); }
.auth-btn:active { transform: translateY(0); }

/* ─── Divider ─── */
.divider {
  text-align: center;
  position: relative;
  margin: 20px 0;
  color: var(--text-muted);
  font-size: 12px;
}

.divider::before, .divider::after {
  content: '';
  position: absolute;
  top: 50%;
  width: 42%;
  height: 1px;
  background: var(--border);
}

.divider::before { left: 0; }
.divider::after { right: 0; }

/* ─── Social Button ─── */
.social-btn {
  width: 100%;
  padding: 12px;
  background: var(--dark-2);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  font-family: 'Inter', sans-serif;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  transition: all 0.2s ease;
}

.social-btn:hover {
  background: var(--glass-hover);
  border-color: rgba(255,255,255,0.15);
  transform: translateY(-1px);
}

/* ─── Toast ─── */
.auth-toast {
  margin-top: 16px;
  padding: 12px 16px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 500;
  animation: slideIn 0.3s ease;
}

.auth-toast.success {
  background: rgba(16,185,129,0.15);
  border: 1px solid rgba(16,185,129,0.3);
  color: #6EE7B7;
}

.auth-toast.error {
  background: rgba(239,68,68,0.15);
  border: 1px solid rgba(239,68,68,0.3);
  color: #FCA5A5;
}

@keyframes slideIn {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ─── Responsive ─── */
@media (max-width: 1024px) {
  .auth-container { grid-template-columns: 1fr; }
  .auth-left { display: none; }
  .auth-right { padding: 40px 20px; }
  .auth-card { max-width: 100%; }
}