/* ===== RESET & DEFAULTS ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: -apple-system, BlinkMacSystemFont,
               "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
  background: #eaf4ff;
  background-image: url('img/background.jpeg');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  background-attachment: fixed;
  min-height: 100vh;
  position: relative;
}

body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: #eaf4ff;
  opacity: 0.7;
  z-index: -1;
}

/* ===== LAYOUT ===== */
.page {
  max-width: 480px;
  margin: 0 auto;
  padding: 40px 16px;
}

/* ===== HEADER ===== */
.header {
  text-align: center;
  margin-bottom: 24px;
}

.logo {
  color: #0068ff;
  font-size: 42px;
  font-weight: 700;
}

.logo-img {
  max-width: 200px;
  height: auto;
  display: block;
  margin: 0 auto;
}

.desc {
  margin-top: 8px;
  color: #444;
  font-size: 14px;
}

/* ===== CARD ===== */
.card {
  background: #fff;
  border-radius: 14px;
  padding: 32px;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.1);
}

.card h2 {
  text-align: center;
  font-size: 18px;
  margin-bottom: 24px;
}

.card.hidden {
  display: none;
}

/* ===== INPUT ===== */
.input-group {
  display: flex;
  align-items: center;
  border-bottom: 1px solid #ddd;
  margin-bottom: 16px;
}

.prefix {
  margin-right: 8px;
  color: #555;
}

input,
select {
  border: none;
  outline: none;
  font-size: 16px;
  padding: 14px 0;
  flex: 1;
  background: transparent;
  color: #333;
}

select {
  cursor: pointer;
}

input::placeholder {
  color: #999;
}

input:disabled {
  background-color: #f5f5f5;
  color: #ccc;
}

input:invalid:not(:placeholder-shown) {
  border-bottom-color: #ff4444;
}

/* ===== PHONE INPUT ===== */
.phone-group {
  flex-wrap: wrap;
}

.country-select {
  padding: 14px 8px;
  flex: 0 0 auto;
  margin-right: 8px;
}

.phone-group input {
  flex: 1;
  min-width: 150px;
}

/* ===== OTP SECTION ===== */
#otpSection {
  margin-bottom: 16px;
}

.otp-inputs {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}

.otp-input {
  width: 50px;
  height: 50px;
  font-size: 20px;
  text-align: center;
  border: 2px solid #ddd;
  border-radius: 8px;
  padding: 0;
}

.otp-input:focus {
  border-color: #0068ff;
  outline: none;
}

.otp-input.hidden {
  display: none;
}

/* ===== ROLE SELECTOR ===== */
.role-selector {
  display: flex;
  gap: 12px;
  margin-bottom: 24px;
}

.role-option {
  flex: 1;
  cursor: pointer;
}

.role-label {
  display: block;
  padding: 12px;
  border: 2px solid #ddd;
  border-radius: 8px;
  text-align: center;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.3s ease;
}

.role-option input:checked + .role-label {
  border-color: #0068ff;
  background-color: #f0f7ff;
  color: #0068ff;
}

/* ===== BUTTONS ===== */
button {
  border: none;
  outline: none;
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  transition: all 0.3s ease;
}

.btn-primary {
  width: 100%;
  padding: 14px;
  background: #0068ff;
  color: #fff;
  border-radius: 8px;
  margin-bottom: 16px;
}

.btn-primary:hover:not(:disabled) {
  background: #0052cc;
}

.btn-primary:disabled {
  background: #ccc;
  cursor: not-allowed;
}

.btn-primary.loading {
  opacity: 0.7;
}

/* ===== MESSAGES ===== */
.form-message {
  padding: 12px;
  margin-bottom: 16px;
  border-radius: 6px;
  text-align: center;
  font-size: 14px;
  min-height: 20px;
}

.form-message.hidden {
  display: none;
}

.form-message.success {
  background-color: #e8f5e9;
  color: #2e7d32;
  border: 1px solid #c8e6c9;
}

.form-message.error {
  background-color: #ffebee;
  color: #c62828;
  border: 1px solid #ffcdd2;
}

.form-message.info {
  background-color: #e3f2fd;
  color: #1565c0;
  border: 1px solid #bbdefb;
}

/* ===== DIVIDER ===== */
.divider {
  height: 1px;
  background: #ddd;
  margin: 24px 0;
}

/* ===== LINKS ===== */
.link {
  display: inline-block;
  color: #0068ff;
  text-decoration: none;
  font-size: 14px;
  cursor: pointer;
  transition: color 0.3s ease;
}

.link:hover {
  color: #0052cc;
  text-decoration: underline;
}

.link.strong {
  font-weight: 600;
  display: block;
  text-align: center;
}

/* ===== OTP NOTIFICATION ===== */
.otp-notification {
  position: fixed;
  top: 20px;
  right: 20px;
  background: #fff;
  border: 2px solid #0068ff;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
  z-index: 1000;
  max-width: 350px;
}

.otp-notification.hidden {
  display: none;
}

.otp-notification h3 {
  color: #0068ff;
  margin-bottom: 12px;
  font-size: 16px;
}

.otp-notification p {
  color: #333;
  margin-bottom: 8px;
  font-size: 14px;
}

.otp-code {
  font-family: 'Courier New', monospace;
  font-weight: bold;
  color: #0068ff;
  font-size: 16px;
}

.otp-note {
  color: #999;
  font-size: 12px;
  margin-top: 12px;
}

.otp-notification .btn-primary {
  width: 100%;
  margin-top: 12px;
}

/* ===== FORM VALIDATION ===== */
form.submitted input:invalid:not(:placeholder-shown) {
  border-bottom-color: #ff4444;
}

form.submitted .form-message:empty {
  display: none;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 480px) {
  .page {
    padding: 20px 12px;
  }

  .card {
    padding: 24px;
  }

  .otp-notification {
    right: 10px;
    left: 10px;
    max-width: none;
  }
}

/* ===== ANIMATIONS ===== */
@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.card {
  animation: slideDown 0.3s ease-out;
}

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

.form-message.error {
  animation: shake 0.3s ease-out;
}

/* Style cho nút Back */
.card {
  position: relative; /* Đảm bảo nút con căn lề theo card */
  padding-top: 40px;  /* Tạo không gian phía trên để không đè vào tiêu đề h2 */
}

.back-home-btn {
  position: absolute;
  top: 15px;
  left: 15px;
  color: #666;
  text-decoration: none;
  display: flex;
  align-items: center;
  transition: color 0.3s ease;
}

.back-home-btn:hover {
  color: #007bff; /* Màu xanh khi hover, bạn có thể đổi theo màu chủ đạo của Shipway */
}