/* ================================
   GLOBAL STYLES & RESET
================================ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  line-height: 1.6;
}

/* Main container layout */
.container {
  display: flex;
  width: 100%;
  max-width: 1200px;
  background: rgba(255, 255, 255, 0.95);
  border-radius: 24px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
  backdrop-filter: blur(10px);
  overflow: hidden;
  min-height: 600px;
}

/* ================================
   LEFT SECTION
================================ */
.left {
  flex: 1;
  padding: 60px 50px;
  background: linear-gradient(135deg, #047857 0%, #065f46 100%);
  color: white;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
}

.left::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="%23ffffff" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>') repeat;
  opacity: 0.3;
}

.left > * {
  position: relative;
  z-index: 1;
}

.icon-box {
  width: 80px;
  height: 80px;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 20px;
  display: flex;
  justify-content: center;
  align-items: center;
  margin-bottom: 30px;
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.icon-box i {
  font-size: 32px;
  color: #10b981;
}

.left h1 {
  font-size: 48px;
  font-weight: 700;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #ffffff 0%, #e0e7ff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  font-size: 18px;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 40px;
  line-height: 1.7;
}

.features {
  list-style: none;
}

.features li {
  display: flex;
  align-items: center;
  margin-bottom: 16px;
  font-size: 16px;
  color: rgba(255, 255, 255, 0.9);
  transition: transform 0.2s ease;
}

.features li:hover {
  transform: translateX(5px);
}

.features li i {
  width: 20px;
  margin-right: 15px;
  color: #10b981;
  font-size: 16px;
}

/* ================================
   RIGHT SECTION (FORM BOX)
================================ */
.right {
  flex: 1;
  padding: 50px;
  background: white;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.right > * {
  width: 100%;
  max-width: 400px;
}

/* Tabs */
.tabs {
  display: flex;
  background: #f8fafc;
  border-radius: 12px;
  padding: 4px;
  margin-bottom: 40px;
  position: relative;
}

.tab {
  flex: 1;
  padding: 12px 20px;
  border: none;
  background: none;
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  border-radius: 8px;
  transition: all 0.3s ease;
  color: #64748b;
  position: relative;
  z-index: 1;
}

.tab.active {
  background: white;
  color: #1e293b;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

/* Form containers */
.form-container {
  display: none;
  animation: fadeIn 0.3s ease;
}

.form-container.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Input groups */
.input-group {
  margin-bottom: 24px;
}

label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
  font-size: 14px;
  color: #374151;
}

input {
  width: 100%;
  padding: 14px 16px;
  border: 2px solid #e5e7eb;
  border-radius: 12px;
  font-size: 16px;
  transition: all 0.3s ease;
  background: #fafafa;
}

input:focus {
  outline: none;
  border-color: #10b981;
  background: white;
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

input::placeholder {
  color: #9ca3af;
}

/* Password input with toggle */
.password-input {
  position: relative;
}

.password-toggle {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  cursor: pointer;
  color: #6b7280;
  padding: 8px;
  border-radius: 6px;
  transition: color 0.2s ease;
}

.password-toggle:hover {
  color: #374151;
  background: #f3f4f6;
}

/* Password strength indicator */
.password-strength {
  margin-top: 8px;
}

.strength-bar {
  height: 4px;
  background: #e5e7eb;
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 4px;
  transition: all 0.3s ease;
}

.strength-text {
  font-size: 12px;
  color: #6b7280;
  font-weight: 500;
}

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

/* Custom checkbox */
.checkbox-container {
  display: flex;
  align-items: center;
  cursor: pointer;
  font-size: 14px;
  color: #374151;
  position: relative;
}

.checkbox-container input {
  width: auto;
  margin: 0;
  opacity: 0;
  position: absolute;
}

.checkmark {
  width: 18px;
  height: 18px;
  border: 2px solid #d1d5db;
  border-radius: 4px;
  margin-right: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}

.checkbox-container input:checked + .checkmark {
  background: #10b981;
  border-color: #10b981;
}

.checkbox-container input:checked + .checkmark::after {
  content: '✓';
  color: white;
  font-size: 12px;
  font-weight: bold;
}

.terms-checkbox {
  margin-bottom: 24px;
  line-height: 1.5;
}

/* Links */
.forgot-link, .link {
  color: #10b981;
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s ease;
}

.forgot-link:hover, .link:hover {
  color: #059669;
  text-decoration: underline;
}

/* Buttons */
.btn {
  width: 100%;
  padding: 16px;
  border: none;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-bottom: 16px;
}

.btn.primary {
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
  color: white;
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.btn.primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
}

.btn.google-btn {
  background: white;
  border: 2px solid #e5e7eb;
  color: #374151;
}

.btn.google-btn:hover {
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
  border-color: #10b981;
  color: white;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.btn.google-btn:hover i {
  color: white;
}

.btn.google-btn i {
  color: #ea4335;
  transition: color 0.3s ease;
}

/* Divider */
.divider {
  position: relative;
  text-align: center;
  margin: 24px 0;
  color: #6b7280;
  font-size: 14px;
}

.divider::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 1px;
  background: #e5e7eb;
  z-index: 1;
}

.divider span {
  background: white;
  padding: 0 16px;
  position: relative;
  z-index: 2;
}

/* ================================
   RESPONSIVE DESIGN
================================ */
@media (max-width: 1024px) {
  .container {
    flex-direction: column;
    max-width: 500px;
  }
  
  .left {
    padding: 40px 30px;
    text-align: center;
  }
  
  .left h1 {
    font-size: 36px;
  }
  
  .right {
    padding: 40px 30px;
  }
}

@media (max-width: 640px) {
  body {
    padding: 10px;
  }
  
  .container {
    border-radius: 16px;
  }
  
  .left {
    padding: 30px 20px;
  }
  
  .left h1 {
    font-size: 28px;
  }
  
  .right {
    padding: 30px 20px;
  }
  
  .form-options {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
}

/* ================================
   ANIMATIONS & MICRO-INTERACTIONS
================================ */
.btn {
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn:active::before {
  width: 300px;
  height: 300px;
}

.input-group {
  position: relative;
}

.input-group input:focus + label,
.input-group input:not(:placeholder-shown) + label {
  transform: translateY(-8px);
  font-size: 12px;
  color: #3b82f6;
}

/* Loading states */
.btn.loading {
  pointer-events: none;
  opacity: 0.7;
}

.btn.loading::after {
  content: '';
  width: 16px;
  height: 16px;
  border: 2px solid transparent;
  border-top: 2px solid currentColor;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-left: 8px;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}