/* ========== VARIABLES ========== */
:root {
  --primary: #6e3aff;
  --primary-light: #8d5eff;
  --primary-dark: #5a2ce0;
  --secondary: #00c6ff;
  --accent: #ff4d7e;
  --dark: #2a2a3c;
  --darker: #1e1e2d;
  --light: #ffffff;
  --light-gray: #f8f9fa;
  --medium-gray: #e9ecef;
  --gray: #6c757d;
  --text: #495057;
  --text-dark: #343a40;
  --error: #dc3545;
  --success: #28a745;
}

/* ========== BASE STYLES ========== */
* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Inter", sans-serif;
  background: var(--light);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

/* ========== LANGUAGE SELECTOR ========== */
.language-selector {
  position: absolute;
  top: 20px;
  right: 20px;
  z-index: 10;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-radius: 50px;
  padding: 6px 12px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
  border: 1px solid var(--medium-gray);
  display: flex;
  gap: 8px;
  align-items: center;
}

.lang-btn {
  background: transparent;
  border: 2px solid transparent;
  padding: 4px 10px;
  border-radius: 20px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.85rem;
  transition: all 0.3s ease;
  color: var(--gray);
}

.lang-btn:hover {
  color: var(--primary);
}

.lang-btn.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.lang-icon {
  font-size: 1rem;
  margin-right: 3px;
}

/* ========== BACK ARROW ========== */
.back-arrow {
  position: absolute;
  top: 20px;
  left: 20px;
  z-index: 10;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-radius: 50%;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
  border: 1px solid var(--medium-gray);
  color: var(--primary);
  transition: all 0.3s ease;
}

.back-arrow:hover {
  transform: translateX(-5px);
  background: var(--primary);
  color: white;
}

/* ========== REGISTER CONTAINER ========== */
.register-container {
  min-width: 520px;
  width: 520px;
  background: white;
  border-radius: 20px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
  padding: 40px;
  position: relative;
  overflow: hidden;
  margin: 20px auto;
}

.register-container::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
}

.register-title {
  text-align: center;
  margin-bottom: 30px;
  padding-top: 50px;
}

.register-title h2 {
  font-size: 2rem;
  margin-bottom: 10px;
  font-weight: 700;
  color: var(--dark);
}

.register-title p {
  color: var(--gray);
  font-size: 1rem;
  margin-top: 8px;
}

/* ========== FORM STYLES ========== */
.form-group {
  margin-bottom: 20px;
  position: relative;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: var(--text-dark);
  font-size: 0.95rem;
}

.form-control {
  width: 100%;
  padding: 14px 16px;
  font-size: 1rem;
  border: 2px solid var(--medium-gray);
  border-radius: 10px;
  transition: all 0.3s ease;
  background-color: var(--light-gray);
  font-family: "Inter", sans-serif;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  background-color: white;
  box-shadow: 0 0 0 3px rgba(110, 58, 255, 0.1);
}

select.form-control {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236c757d' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 35px;
}

/* Optimize select for mobile */
@media (max-width: 767px) {
  select.form-control {
    font-size: 16px;
    padding: 12px 35px 12px 14px;
    height: auto;
    line-height: 1.5;
  }

  select.form-control option {
    font-size: 16px;
    padding: 10px;
  }
}

/* ========== VALIDATION STYLES ========== */
.invalid-feedback {
  display: none;
  color: var(--error);
  font-size: 0.85rem;
  margin-top: 5px;
}

.is-invalid {
  border-color: var(--error) !important;
  background-color: rgba(220, 53, 69, 0.05);
}

.is-invalid + .invalid-feedback {
  display: block;
}

.is-valid {
  border-color: var(--success) !important;
  background-color: rgba(40, 167, 69, 0.05);
}

.valid-feedback {
  display: none;
  color: var(--success);
  font-size: 0.85rem;
  margin-top: 5px;
}

.is-valid + .valid-feedback {
  display: block;
}

.email-checking {
  border-color: var(--primary) !important;
  background: linear-gradient(
    90deg,
    var(--light-gray) 0%,
    var(--light-gray) 50%,
    white 50%,
    white 100%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
  0% {
    background-position: 200% 0;
  }

  100% {
    background-position: -200% 0;
  }
}

/* ========== BUTTON STYLES ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 15px 30px;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: 10px;
  transition: all 0.3s ease;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  position: relative;
  overflow: hidden;
  z-index: 1;
  border: none;
  cursor: pointer;
  width: 100%;
  font-family: "Inter", sans-serif;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: white;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(110, 58, 255, 0.3);
}

.btn:active {
  transform: translateY(0);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none !important;
}

/* ========== LINKS STYLES ========== */
.login-link {
  text-align: center;
  margin-top: 25px;
  color: var(--gray);
  font-size: 0.95rem;
}

.login-link a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
}

.login-link a:hover {
  text-decoration: underline;
}

/* ========== MODAL STYLES ========== */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 2000;
  padding: clamp(16px, 4vw, 32px);
  box-sizing: border-box;
  background: rgba(12, 14, 22, 0.65);
  backdrop-filter: blur(4px);
  overflow-y: auto;
  justify-content: center;
  align-items: flex-start;
}

.modal.show {
  display: flex;
}

.modal-content {
  width: min(540px, 100%);
  margin: auto;
  border-radius: 20px;
  box-shadow: 0 24px 55px rgba(15, 23, 42, 0.25);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  animation: modalFade 0.28s ease;
}

.modal-header {
  padding: 25px 30px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: white;
}

.modal-header h3 {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 700;
}

.modal-header p {
  margin: 8px 0 0 0;
  opacity: 0.9;
  font-size: 0.95rem;
}

.modal-body {
  padding: clamp(24px, 4vw, 32px);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.modal-footer {
  padding: clamp(18px, 3vw, 28px);
  background-color: var(--light-gray);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: flex-end;
}

.modal-footer .btn {
  width: auto;
  min-width: 120px;
}

.btn-secondary {
  background: var(--gray);
  color: white;
}

.btn-secondary:hover {
  background: var(--text-dark);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.captcha-container {
  display: flex;
  justify-content: center;
  margin: 20px 0;
}

/* ========== ANIMATIONS ========== */
@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@keyframes modalFade {
  from {
    opacity: 0;
    transform: translateY(18px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ========== MEDIA QUERIES ========== */
@media (max-width: 767px) {
  body {
    padding: 10px;
  }

  .register-container {
    padding: 30px 20px;
    margin: 10px auto;
    min-width: auto;
    width: 100%;
    border-width: 2px;
  }

  .register-title {
    font-size: 1.5rem;
  }

  .register-title p {
    font-size: 0.9rem;
  }

  .register-title {
    padding-top: 35px;
  }

  /* Professional mobile header layout */
  .language-selector {
    top: 15px;
    right: 15px;
    padding: 5px 10px;
    gap: 6px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  }

  .lang-btn {
    padding: 4px 8px;
    font-size: 0.8rem;
    min-width: 46px;
  }

  .lang-icon {
    font-size: 1rem;
  }

  .back-arrow {
    top: 15px;
    left: 15px;
    width: 42px;
    height: 42px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  }

  .back-arrow svg {
    width: 22px;
    height: 22px;
  }

  .back-arrow:active {
    transform: scale(0.95);
  }

  .lang-btn:active {
    transform: scale(0.95);
  }

  .form-control {
    padding: 12px 14px;
    font-size: 0.95rem;
  }

  .btn {
    padding: 14px 25px;
    font-size: 0.95rem;
  }

  .modal-content {
    width: 95%;
    margin: 10px;
  }

  .modal-header {
    padding: 20px;
  }

  .modal-header h3 {
    font-size: 1.25rem;
  }

  .modal-body {
    padding: 20px;
  }
}

@media (min-width: 768px) and (max-width: 1024px) {
  /* Tablets */
  .register-container {
    min-width: 520px;
    width: 520px;
    padding: 40px;
  }

  .register-title h2 {
    font-size: 2rem;
  }
}

@media (min-width: 768px) {
  .register-container {
    padding: 40px;
    min-width: 520px;
    width: 520px;
  }
}

@media (max-width: 374px) {
  /* Small phones */
  .register-container {
    padding: 25px 15px;
  }

  .register-title h2 {
    font-size: 1.35rem;
  }

  .form-control {
    padding: 10px 12px;
    font-size: 0.9rem;
  }

  .btn {
    padding: 12px 20px;
  }

  /* Compact header for very small screens */
  .language-selector {
    top: 12px;
    right: 12px;
    padding: 4px 8px;
    gap: 5px;
  }

  .lang-btn {
    padding: 3px 8px;
    font-size: 0.75rem;
    min-width: 42px;
  }

  .back-arrow {
    top: 12px;
    left: 12px;
    width: 38px;
    height: 38px;
  }

  .back-arrow svg {
    width: 20px;
    height: 20px;
  }
}

/* Landscape mode for phones */
@media (max-height: 600px) and (orientation: landscape) {
  body {
    padding: 5px;
  }

  .register-container {
    padding: 20px;
    margin: 5px;
  }

  .register-title h2 {
    font-size: 1.35rem;
    margin-bottom: 5px;
  }

  .register-title p {
    display: none;
  }

  .form-group {
    margin-bottom: 12px;
  }

  .form-group label {
    margin-bottom: 5px;
  }

  .form-control {
    padding: 10px 12px;
  }

  /* Compact header for landscape */
  .language-selector {
    top: 8px;
    right: 8px;
    padding: 4px 8px;
    gap: 5px;
  }

  .lang-btn {
    padding: 3px 8px;
    font-size: 0.7rem;
    min-width: 38px;
  }

  .lang-icon {
    font-size: 0.9rem;
  }

  .back-arrow {
    top: 8px;
    left: 8px;
    width: 36px;
    height: 36px;
  }

  .back-arrow svg {
    width: 20px;
    height: 20px;
  }
}

/* Enhanced touch targets for all mobile devices */
@media (hover: none) and (pointer: coarse) {
  .back-arrow,
  .lang-btn {
    -webkit-tap-highlight-color: rgba(110, 58, 255, 0.2);
    touch-action: manipulation;
  }
}