@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap");

:root {
  --primary: #3b82f6;
  --primary-light: #e0e7ff;
  --primary-dark: #1e40af;
  --success: #10b981;
  --success-light: #d1fae5;
  --warning: #f59e0b;
  --danger: #ef4444;
  --danger-light: #fee2e2;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-600: #4b5563;
  --gray-900: #111827;
}

* {
  box-sizing: border-box;
}

body {
  font-family:
    "Inter",
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
  background: linear-gradient(135deg, #f3f4f6 0%, #e5e7eb 100%);
  color: var(--gray-900);
  margin: 0;
  padding: 20px;
  min-height: 100vh;
  transition: filter 0.3s ease;
}

/* API Key Modal Styles */
.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  justify-content: center;
  align-items: center;
}

.modal.active {
  display: flex;
}

.modal-content {
  background: white;
  padding: 40px;
  padding-bottom: 10px;
  border-radius: 16px;
  width: 90%;
  max-width: 500px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  animation: slideIn 0.3s ease;
  position: relative;
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  background: none;
  border: none;
  font-size: 32px;
  color: var(--gray-600);
  cursor: pointer;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  transition: all 0.2s ease;
  line-height: 1;
  padding: 0;
}

.modal-close:hover {
  background-color: var(--gray-100);
  color: var(--gray-900);
}

.modal-close:active {
  background-color: var(--gray-200);
}

@keyframes slideIn {
  from {
    transform: translateY(-50px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.modal-content h2 {
  margin: 0 0 12px 0;
  color: var(--gray-900);
  font-size: 1.75rem;
  font-weight: 700;
}

.modal-content p {
  color: var(--gray-600);
  margin: 0 0 24px 0;
  line-height: 1.6;
}

.modal-content .form-group {
  margin-bottom: 20px;
}

.modal-content input {
  width: 100%;
  padding: 12px 16px;
  font-size: 1rem;
  border: 2px solid var(--gray-200);
  border-radius: 8px;
  font-family: "Courier New", monospace;
  letter-spacing: 0.5px;
  margin-top: 3px;
}
.api-key-status {
  margin-top: 8px;
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  display: none;
}

.api-key-status.error {
  display: block;
  background-color: var(--danger-light);
  color: var(--danger);
  border-left: 3px solid var(--danger);
}

.api-key-status.success {
  display: block;
  background-color: var(--success-light);
  color: var(--success);
  border-left: 3px solid var(--success);
}

.api-key-status.validating {
  display: block;
  background-color: var(--primary-light);
  color: var(--primary);
  border-left: 3px solid var(--primary);
}
.modal-buttons {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
  margin-top: 24px;
}

.btn-primary {
  padding: 12px 28px;
  background-color: var(--primary);
  color: white;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.3s ease;
  font-family: inherit;
}

.btn-primary:hover {
  background-color: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

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

.modal-footer-note {
  font-size: 0.8rem;
  padding-top: 15px;
  color: var(--gray-600);
  font-style: italic;
  text-align: right;
}

.action-buttons {
  position: absolute;
  top: 20px;
  right: 20px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.action-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: white;
  border: 2px solid var(--gray-200);
  border-radius: 8px;
  color: var(--gray-600);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  font-family: inherit;
}

.action-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.2);
}

.action-btn svg {
  width: 16px;
  height: 16px;
  transition: all 0.3s ease;
}

#change-gas-type.action-btn:hover svg {
  fill: var(--primary);
}

#api-key-modal .modal-content {
  max-width: 520px;
}

/* Gas Type Modal Styles */
.gas-type-modal-content {
  max-width: 560px;
}

.gas-type-modal-content > small {
  display: block;
  text-align: center;
  margin-bottom: 10px;
  color: var(--gray-600);
  font-size: 0.9rem;
}

.gas-type-modal-content > small a {
  color: inherit;
  text-decoration: none;
  transition: color 0.3s ease;
}

.gas-type-modal-content > small a:hover {
  text-decoration: underline;
}

.gas-type-modal-content > small a:active {
  color: var(--gray-600);
}

.gas-type-modal-content > small a:visited {
  color: var(--gray-600);
}

.gas-type-options {
  display: flex;
  gap: 16px;
  margin: 20px;
}

.gas-type-option {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 24px 16px;
  background: white;
  border: 2px solid var(--gray-200);
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  font-family: inherit;
}

.gas-type-option:hover {
  border-color: var(--primary);
  transform: translateY(-3px);
  box-shadow: 0 6px 16px rgba(59, 130, 246, 0.2);
}

.gas-type-option.active {
  border-color: var(--primary);
  background: var(--primary-light);
}

.gas-type-option svg {
  width: 32px;
  height: 32px;
  color: var(--gray-600);
  transition: color 0.3s ease;
}

.gas-type-option.active svg {
  color: var(--primary);
}

.gas-type-option span {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--gray-900);
}

.gas-type-option .checkmark {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 24px;
  height: 24px;
  background: var(--primary);
  color: white;
  border-radius: 50%;
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: bold;
}

.gas-type-option.active .checkmark {
  display: flex;
}

.gas-type-option small {
  font-size: 0.9rem;
  color: var(--gray-600);
}

.no-select {
  user-select: none;
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
}

.container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
}

.gas-prices-loading-msg {
  margin-top: 10px;
  height: 10px;
}

.gas-prices-loading-msg span {
  display: none;
  color: var(--gray-600);
  font-size: 0.9rem;
  font-style: italic;
  margin-top: -30px;
}

h1 {
  font-size: 2.5rem;
  font-weight: 700;
  background: linear-gradient(
    135deg,
    var(--primary) 0%,
    var(--primary-dark) 100%
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin: 20px auto 40px auto;
}

#vehicle-info,
#fuel-info {
  display: flex;
  flex-direction: row;
  align-items: flex-end;
  justify-content: center;
  gap: 30px;
  flex-wrap: wrap;
  margin-bottom: 30px;
}

#vehicle-info > .form-group,
#fuel-info > .form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 160px;
}

.form-group label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--gray-600);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.form-group input {
  padding: 10px 12px;
  font-size: 1rem;
  border: 2px solid var(--gray-200);
  border-radius: 8px;
  transition: all 0.3s ease;
  background-color: white;
  font-family: inherit;
}

.form-group input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

.form-group input:hover:not(:focus) {
  border-color: var(--gray-300);
}

.buttons {
  display: flex;
  flex-direction: row;
  gap: 16px;
  justify-content: center;
  align-items: center;
  list-style: none;
  padding: 0;
  margin: 0;
  flex-wrap: wrap;
  margin-bottom: 30px;
}

.buttons .form-group {
  min-width: auto;
}

.buttons .form-group a {
  display: flex;
  justify-content: center;
  align-items: center;
}

.buttons a {
  text-decoration: none;
  color: inherit;
  display: flex;
  justify-content: center;
  align-items: center;
}

.buttons li {
  list-style: none;
  padding: 12px 28px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border: 2px solid transparent;
  cursor: pointer;
  background-color: var(--primary);
  color: white;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

#fuel-tank-size li {
  background-color: var(--success);
}

#clear-all li {
  background-color: var(--danger);
}

.buttons li:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

.buttons li:active {
  transform: translateY(0);
}

#fuel-tank-size li:hover {
  background-color: #059669;
}

#clear-all li:hover {
  background-color: #dc2626;
}

section.final {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: transparent;
  width: 100%;
  max-width: 500px;
}

.range-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--gray-600);
  margin-bottom: 20px;
  text-align: center;
}

#gas-difference {
  font-weight: 700;
  color: var(--primary);
  font-size: 1rem;
}

#gas-meter {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  max-width: 280px;
  height: 8px;
  border-radius: 4px;
  background: linear-gradient(
    to right,
    #c9e0fa,
    #a1c6f0,
    #fbbf24,
    #a3e635,
    #86efac
  );
  outline: none;
  margin: 20px 0;
  cursor: pointer;
}

#gas-meter::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--primary);
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  transition: all 0.2s ease;
}

#gas-meter::-webkit-slider-thumb:hover {
  transform: scale(1.15);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

#gas-meter::-moz-range-thumb {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--primary);
  cursor: pointer;
  border: none;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  transition: all 0.2s ease;
}

#gas-meter::-moz-range-thumb:hover {
  transform: scale(1.15);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

#amount-due {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary);
  margin-top: 20px;
  min-height: 2.5rem;
  text-align: center;
}

@media (max-width: 768px) {
  body {
    padding: 15px 10px;
  }

  h1 {
    font-size: 1.75rem;
    margin-bottom: 20px;
  }

  .action-buttons {
    position: static;
    justify-content: center;
    margin: 0 auto 20px;
    gap: 8px;
  }

  .action-btn {
    padding: 8px 12px;
    font-size: 0.8rem;
  }

  .container {
    padding: 0 5px;
  }

  #vehicle-info,
  #fuel-info {
    gap: 15px;
    margin-bottom: 20px;
    width: 100%;
  }

  #vehicle-info > .form-group,
  #fuel-info > .form-group {
    min-width: 140px;
    flex: 1;
  }

  .form-group input {
    padding: 10px;
    font-size: 0.95rem;
  }

  .form-group label {
    font-size: 0.8rem;
  }

  section.final {
    padding: 20px 10px;
    max-width: 100%;
  }

  .range-title {
    font-size: 0.9rem;
  }

  #amount-due {
    font-size: 1.5rem;
  }

  .buttons {
    gap: 10px;
    margin-bottom: 20px;
    width: 100%;
  }

  .buttons li {
    padding: 10px 16px;
    font-size: 0.85rem;
  }

  .error {
    max-width: 100%;
    padding: 12px;
  }

  #error-message {
    font-size: 0.85rem;
  }

  .footer {
    font-size: 0.75rem;
    padding: 15px 10px;
  }

  .modal-content {
    padding: 30px 20px;
    width: 95%;
  }

  .modal-content h2 {
    font-size: 1.5rem;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 1.5rem;
    margin-bottom: 15px;
  }

  #vehicle-info,
  #fuel-info {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
  }

  #vehicle-info > .form-group,
  #fuel-info > .form-group {
    min-width: 100%;
    width: 100%;
  }

  .buttons {
    flex-direction: column;
    width: 100%;
  }

  .buttons .form-group {
    width: 100%;
  }

  .buttons li {
    width: 100%;
    text-align: center;
  }

  #gas-meter {
    max-width: 100%;
  }

  .modal-content {
    padding: 25px 15px;
  }
}

.error {
  width: 100%;
  max-width: 580px;
  padding: 16px 16px;
  margin-top: 30px;
  background-color: var(--danger-light);
  border: 1px solid var(--gray-300);
  border-radius: 10px;
}

#error-message {
  margin: 0;
  color: var(--danger);
  font-size: 0.95rem;
  font-weight: 500;
  line-height: 1;
}

.footer {
  width: 100%;
  text-align: center;
  padding: 30px 20px;
  color: var(--gray-600);
  font-size: 0.875rem;
  border-top: 1px solid var(--gray-200);
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(135deg, #f3f4f6 0%, #e5e7eb 100%);
  box-sizing: border-box;
}

.footer p {
  margin: 0;
}

.footer a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.3s ease;
}

.footer a:hover {
  color: var(--primary-dark);
  text-decoration: underline;
}