:root {
  --primary: #6366f1;
  --primary-light: #818cf8;
  --primary-dark: #4f46e5;
  --primary-glow: rgba(99, 102, 241, 0.15);
  --bg: #0f172a;
  --bg-card: rgba(30, 41, 59, 0.75);
  --input-bg: rgba(15, 23, 42, 0.6);
  --border: rgba(148, 163, 184, 0.15);
  --text1: #f1f5f9;
  --text2: #94a3b8;
  --text3: #64748b;
  --error: #ef4444;
  --radius: 16px;
  --transition: all 0.25s ease;
}

[data-theme="light"] {
  --primary: #4f46e5;
  --primary-light: #6366f1;
  --primary-dark: #3730a3;
  --primary-glow: rgba(79, 70, 229, 0.15);
  --bg: #f8fafc;
  --bg-card: rgba(255, 255, 255, 0.9);
  --input-bg: rgba(241, 245, 249, 0.8);
  --border: #e2e8f0;
  --text1: #0f172a;
  --text2: #334155;
  --text3: #64748b;
  --error: #dc2626;
}

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

body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text1);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow-x: hidden;
  transition: background 0.3s ease, color 0.3s ease;
}

.login-container {
  position: relative;
  width: 100%;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

/* Top Navigation Bar */
.top-nav-bar {
  position: fixed;
  top: 20px;
  left: 24px;
  right: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: 100;
}
.back-link {
  color: var(--text2);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  padding: 8px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  backdrop-filter: blur(12px);
  transition: var(--transition);
}
.back-link:hover {
  color: var(--primary);
  border-color: var(--primary);
}

/* Theme Toggle Button */
.theme-toggle-btn {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text1);
  width: 40px; height: 40px;
  border-radius: 10px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  backdrop-filter: blur(12px);
  transition: var(--transition);
}
.theme-toggle-btn:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
}

/* Animated background shapes */
.login-bg-shapes { position: fixed; inset: 0; overflow: hidden; z-index: 0; pointer-events: none; }
.shape {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.35;
  animation: floatShape 20s ease-in-out infinite;
}
.shape-1 {
  width: 500px; height: 500px;
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  top: -100px; right: -100px;
  animation-delay: 0s;
}
.shape-2 {
  width: 400px; height: 400px;
  background: linear-gradient(135deg, #06b6d4, #0ea5e9);
  bottom: -80px; left: -80px;
  animation-delay: -7s;
}
.shape-3 {
  width: 300px; height: 300px;
  background: linear-gradient(135deg, #f43f5e, #ec4899);
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  animation-delay: -14s;
}
@keyframes floatShape {
  0%, 100% { transform: translate(0, 0) scale(1); }
  25% { transform: translate(30px, -40px) scale(1.05); }
  50% { transform: translate(-20px, 30px) scale(0.95); }
  75% { transform: translate(40px, 20px) scale(1.02); }
}

/* Login Card */
.login-card {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 430px;
  background: var(--bg-card);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 44px 36px 32px;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  animation: cardSlideUp 0.6s ease-out;
  margin-top: 40px;
}
@keyframes cardSlideUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

.login-header {
  text-align: center;
  margin-bottom: 28px;
}
.logo-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 60px; height: 60px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  font-family: 'Outfit', sans-serif;
  font-weight: 800;
  font-size: 18px;
  border-radius: 16px;
  margin-bottom: 14px;
  box-shadow: 0 8px 24px var(--primary-glow);
  letter-spacing: -0.5px;
}
.login-header h1 {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 24px;
  color: var(--text1);
  margin-bottom: 4px;
}
.login-header p {
  font-size: 13px;
  color: var(--text3);
  font-weight: 500;
}

/* Form */
.form-group {
  margin-bottom: 18px;
}
.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text2);
  margin-bottom: 6px;
  letter-spacing: 0.3px;
}
.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: 13px 14px 13px 44px;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text1);
  font-size: 14px;
  font-family: 'Inter', sans-serif;
  transition: all 0.2s ease;
  outline: none;
}
.input-wrapper input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
}
.input-wrapper input::placeholder {
  color: var(--text3);
}
.toggle-password {
  position: absolute;
  right: 12px;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 16px;
  padding: 4px;
  opacity: 0.6;
  transition: opacity 0.2s;
  color: var(--text1);
}
.toggle-password:hover { opacity: 1; }

.error-message {
  color: var(--error);
  font-size: 13px;
  font-weight: 500;
  min-height: 20px;
  margin-bottom: 8px;
  text-align: center;
  transition: all 0.2s;
}

.login-btn {
  width: 100%;
  padding: 13px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  border: none;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  font-family: 'Inter', sans-serif;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 4px 14px var(--primary-glow);
}
.login-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 20px var(--primary-glow);
}
.login-btn:active {
  transform: translateY(0);
}
.login-btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none;
}

/* Divider */
.divider {
  display: flex;
  align-items: center;
  text-align: center;
  margin: 20px 0;
}
.divider::before, .divider::after {
  content: '';
  flex: 1;
  border-bottom: 1px solid var(--border);
}
.divider span {
  padding: 0 10px;
  font-size: 11px;
  color: var(--text3);
  font-weight: 700;
  letter-spacing: 0.5px;
}

/* Initialize Database Button */
.init-db-btn {
  width: 100%;
  padding: 12px;
  background: rgba(99, 102, 241, 0.08);
  border: 1px dashed var(--primary);
  color: var(--primary-light);
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  font-family: 'Inter', sans-serif;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}
[data-theme="light"] .init-db-btn {
  color: var(--primary);
  background: rgba(79, 70, 229, 0.06);
}
.init-db-btn:hover {
  background: var(--primary-glow);
  transform: translateY(-1px);
}
.init-db-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* Setup Status Notification Card */
.setup-status {
  margin-top: 16px;
  padding: 14px;
  border-radius: 10px;
  font-size: 13px;
  line-height: 1.5;
  border: 1px solid transparent;
  animation: fadeIn 0.3s ease-out;
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}
.setup-status.loading {
  background: rgba(59, 130, 246, 0.1);
  border-color: rgba(59, 130, 246, 0.3);
  color: #60a5fa;
}
.setup-status.success {
  background: rgba(16, 185, 129, 0.12);
  border-color: rgba(16, 185, 129, 0.3);
  color: #34d399;
}
[data-theme="light"] .setup-status.success {
  color: #059669;
}
.setup-status.error {
  background: rgba(239, 68, 68, 0.12);
  border-color: rgba(239, 68, 68, 0.3);
  color: var(--error);
}
.setup-status code {
  background: rgba(0, 0, 0, 0.2);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: monospace;
}

.login-footer {
  text-align: center;
  margin-top: 24px;
}
.login-footer p {
  font-size: 12px;
  color: var(--text3);
}

/* Responsive */
@media (max-width: 480px) {
  .login-container { padding: 12px; }
  .login-card { padding: 28px 18px 20px; margin-top: 50px; border-radius: 14px; }
  .login-header h1 { font-size: 20px; }
  .logo-icon { width: 50px; height: 50px; font-size: 16px; margin-bottom: 10px; }
  .top-nav-bar { left: 12px; right: 12px; top: 12px; }
  .back-link { font-size: 12px; padding: 6px 12px; }
  .theme-toggle-btn { width: 36px; height: 36px; font-size: 16px; }
}

@media (max-width: 320px) {
  .login-container { padding: 8px; }
  .login-card { padding: 22px 12px 18px; margin-top: 45px; }
  .login-header h1 { font-size: 18px; }
  .login-header p { font-size: 12px; }
  .logo-icon { width: 44px; height: 44px; font-size: 14px; }
  .input-wrapper input { padding: 10px 10px 10px 36px; font-size: 13px; }
  .input-icon { left: 10px; font-size: 14px; }
  .login-btn, .init-db-btn { padding: 10px; font-size: 13px; }
  .back-link { font-size: 11px; padding: 5px 8px; }
}