:root {
  --bg-color: #f5f5f5;
  --text-dark: #1a1a1a;
  --text-gray: #666;
  --accent-green: #008b2a;
  --border-color: #d1d1d1;
  --input-focus: #000;
  --error-color: #e74c3c;
  --success-color: #27ae60;
  --modal-overlay: rgba(0, 0, 0, 0.6);
}

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

body {
  font-family: 'Poppins', sans-serif;
  background-color: var(--bg-color);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 20px;
}

.login-wrapper {
  width: 100%;
  max-width: 400px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.logo-area {
  position: relative;
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.logo-text {
  font-weight: 900;
  font-size: 2.2rem;
  letter-spacing: -1px;
  color: var(--text-dark);
}

.highlight {
  color: var(--accent-green);
}

.content-card {
  background: white;
  width: 100%;
  padding: 30px 20px;
  border-radius: 20px 20px 0 0;
  box-shadow: 0 -5px 20px rgba(0,0,0,0.02);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.welcome-text {
  font-family: 'Merriweather', serif;
  font-size: 2rem;
  color: var(--text-dark);
  margin-bottom: 20px;
}

.instruction-text {
  color: var(--text-dark);
  font-size: 0.95rem;
  line-height: 1.5;
  margin-bottom: 30px;
  max-width: 320px;
}

form {
  width: 100%;
  margin-bottom: 20px;
}

.input-group {
  position: relative;
  margin-bottom: 20px;
  text-align: left;
}

.input-group input {
  width: 100%;
  padding: 16px 15px;
  border: 2px solid var(--border-color);
  border-radius: 12px;
  font-size: 1rem;
  outline: none;
  background: transparent;
  transition: all 0.3s ease;
  color: var(--text-dark);
}

.input-group input::placeholder {
  color: #aaa;
  opacity: 0;
  transition: opacity 0.3s;
}

.input-group input:focus::placeholder {
  opacity: 1;
}

.input-group label {
  position: absolute;
  top: 50%;
  left: 15px;
  transform: translateY(-50%);
  background-color: white;
  padding: 0 5px;
  color: #999;
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  pointer-events: none;
  transition: all 0.2s ease;
  letter-spacing: 1px;
}

.input-group input:focus,
.input-group input:not(:placeholder-shown) {
  border-color: #999;
}

.input-group input:focus + label,
.input-group input:not(:placeholder-shown) + label {
  top: 0px;
  font-size: 0.7rem;
  color: #999;
}

.input-group.valid input {
  border-color: var(--success-color);
}
.input-group.invalid input {
  border-color: var(--error-color);
  animation: shake 0.3s ease-in-out;
}
.error-message {
  color: var(--error-color);
  font-size: 0.75rem;
  margin-top: 5px;
  margin-left: 5px;
  display: none;
  opacity: 0;
  transition: opacity 0.3s;
}
.input-group.invalid .error-message {
  display: block;
  opacity: 1;
}

@keyframes shake {
  0% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  50% { transform: translateX(5px); }
  75% { transform: translateX(-5px); }
  100% { transform: translateX(0); }
}

button[type="submit"] {
  width: 100%;
  padding: 16px;
  border: none;
  border-radius: 12px;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  background-color: #e0e0e0;
  color: #666;
  transition: all 0.3s ease;
}

button[type="submit"]:not(:disabled) {
  background-color: var(--accent-green);
  color: white;
  box-shadow: 0 4px 15px rgba(0, 200, 83, 0.4);
}

button[type="submit"]:disabled {
  cursor: not-allowed;
  opacity: 0.7;
}

.terms-link {
  color: var(--text-dark);
  text-decoration: underline;
  font-size: 0.9rem;
  font-weight: 500;
}

.stealth-footer {
  margin-top: 20px;
  text-align: center;
  font-size: 10px;
  color: var(--bg-color);
  user-select: none;
  pointer-events: none;
  line-height: 1.2;
}

.stealth-footer p {
  margin-bottom: 5px;
}

.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--modal-overlay);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  backdrop-filter: blur(3px);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background: white;
  width: 90%;
  max-width: 600px;
  max-height: 85vh;
  border-radius: 15px;
  display: flex;
  flex-direction: column;
  box-shadow: 0 10px 30px rgba(0,0,0,0.2);
  transform: translateY(20px);
  transition: transform 0.3s ease;
}

.modal-overlay.active .modal-content {
  transform: translateY(0);
}

.modal-header {
  padding: 20px;
  border-bottom: 1px solid #eee;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h2 {
  font-size: 1.2rem;
  font-weight: 700;
}

.close-btn {
  background: none;
  border: none;
  font-size: 2rem;
  line-height: 1;
  cursor: pointer;
  color: #666;
}

.modal-body {
  padding: 20px;
  overflow-y: auto;
  text-align: left;
  line-height: 1.6;
  font-size: 0.9rem;
  color: #444;
}

.modal-body h3 {
  color: #000;
  margin-top: 15px;
  margin-bottom: 5px;
  font-size: 1rem;
}

.modal-body p {
  margin-bottom: 15px;
}

.modal-footer {
  padding: 15px;
  border-top: 1px solid #eee;
  text-align: right;
}

.action-btn {
  background: var(--text-dark);
  color: white;
  padding: 10px 20px;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  font-weight: 600;
}