/* Container tổng */
.km-container {
  max-width: 860px;
  margin: 40px auto;
  background: #ffffff;
  border-radius: 8px;
  box-shadow: 0 0 18px rgba(0,0,0,0.1);
  padding: 40px 32px 48px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
}

/* Header */
.km-header h1 {
  text-align: center;
  font-size: 26px;
  font-weight: 700;
  color: #00a4e4;
  margin-bottom: 24px;
  text-transform: uppercase;
}

/* Row nhập mã */
.km-code-row {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 8px;
  flex-wrap: wrap;
}

.km-code-input {
  min-width: 260px;
  padding: 12px 18px;
  border-radius: 24px;
  border: 1px solid #d0d0d0;
  font-size: 16px;
  outline: none;
}

.km-code-input:focus {
  border-color: #00a4e4;
  box-shadow: 0 0 0 2px rgba(0,164,228,0.2);
}

/* Button chung */
.km-btn {
  border: none;
  padding: 12px 24px;
  border-radius: 6px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: transform .08s ease, box-shadow .08s ease, opacity .08s ease;
}

.km-btn-primary {
  background: #16a34a;
  color: #fff;
}

.km-btn-primary:hover {
  opacity: .93;
}

/* Thông báo */
.km-message {
  text-align: center;
  margin-top: 6px;
  font-size: 14px;
}

/* Divider */
.km-divider {
  margin: 32px 0 20px;
  border: none;
  height: 1px;
  background: linear-gradient(to right, transparent, #ddd, transparent);
}

/* Steps */
.km-steps h2 {
  text-align: center;
  font-size: 20px;
  font-weight: 700;
  color: #00a4e4;
  text-transform: uppercase;
  margin-bottom: 20px;
}

.km-steps p {
  font-size: 16px;
  line-height: 1.6;
  margin: 6px 0;
}

.km-keyword {
  font-weight: 700;
}

/* Thanh search giống Google */
.km-search-bar {
  margin: 18px auto 24px;
  max-width: 520px;
  background: #ffffff;
  border-radius: 32px;
  box-shadow: 0 3px 10px rgba(0,0,0,0.12);
  padding: 12px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.km-icon-search {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 2px solid #999;
  position: relative;
}

.km-icon-search::after {
  content: '';
  width: 10px;
  height: 2px;
  background: #999;
  position: absolute;
  bottom: -4px;
  right: -4px;
  transform: rotate(45deg);
  border-radius: 2px;
}

.km-search-text {
  font-size: 18px;
  font-weight: 700;
  color: #ff0000;
}

.km-subtitle {
  font-weight: 600;
  margin-top: 10px;
}

/* Ảnh SERP */
.km-serp-image img {
  max-width: 100%;
  display: block;
  margin: 12px auto 8px;
  border-radius: 4px;
}

.km-note {
  font-style: italic;
  margin-bottom: 16px;
}

/* Nút demo lấy mã */
.km-bottom-button-demo {
  margin-top: 20px;
}

.km-btn-danger {
  background: #ef4444;
  color: #fff;
  border-radius: 32px;
  padding: 14px 38px;
  font-size: 18px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  border: none;
}

.km-btn-danger:hover {
  opacity: .93;
}

.km-icon-coin {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: #1d4ed8;
  color: #fff;
  font-weight: 700;
}

/* Extra instruction */
.km-extra-instruction {
  margin-top: 18px;
  padding-top: 10px;
  border-top: 1px dashed #e5e7eb;
  font-size: 15px;
}

/* Responsive */
@media (max-width: 600px) {
  .km-container {
    padding: 24px 18px 32px;
  }

  .km-header h1 {
    font-size: 20px;
  }

  .km-search-text {
    font-size: 16px;
  }

  .km-btn-danger {
    width: 100%;
    justify-content: center;
  }
}