/* CSS Variables for theming */
:root {
  --primary-color: #3C2415;
  --secondary-color: #6F4E37;
  --accent-color: #A67B5B;
  --light-accent: #C4915C;
  --background-color: #E6D5AA;
  --text-color: #3C2415;
  --text-light: #6F4E37;
  --white: #FFFFFF;
  --error-color: #D32F2F;
  --success-color: #388E3C;
  --warning-color: #F57C00;
  --shadow: 0 2px 8px rgba(60, 36, 21, 0.1);
  --shadow-hover: 0 4px 16px rgba(60, 36, 21, 0.2);
  --border-radius: 12px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --primary-color: #E6D5AA;
  --secondary-color: #C4915C;
  --accent-color: #A67B5B;
  --light-accent: #6F4E37;
  --background-color: #2C1810;
  --text-color: #E6D5AA;
  --text-light: #C4915C;
  --white: #3C2415;
}

/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--background-color);
  transition: var(--transition);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
  width: 100%;
}

/* Header */
.header {
  background: var(--white);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
  padding: 20px 0 0 0;
}

.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem;
}

.header__title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.header__logo {
  width: 32px;
  height: 32px;
  object-fit: contain;
}

.header__title-text {
  display: inline-block;
}

.header__nav {
  display: flex;
  gap: 0.5rem;
}

.nav__btn {
  background: var(--accent-color);
  color: var(--white);
  border: none;
  padding: 0.35rem;
  border-radius: 999px;
  cursor: pointer;
  transition: var(--transition);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
}

.nav__btn:hover {
  background: var(--secondary-color);
  transform: translateY(-2px);
}

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

.nav__btn--icon .nav__text {
  display: none;
}

.nav__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.nav__icon--theme {
  transition: var(--transition);
}

[data-theme="dark"] .nav__icon--theme {
  display: none;
}

[data-theme="dark"] .nav__icon--theme-dark {
  display: inline-flex;
}

.nav__icon--theme-dark {
  display: none;
}

/* Main Content */
.main {
  flex: 1;
  padding: 2rem 0;
}

/* Section Styles */
.section__title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 1rem;
  text-align: center;
}

.section__helper {
  font-size: 0.95rem;
  color: var(--text-light);
  max-width: 680px;
  margin: 0 auto 1.5rem auto;
  text-align: center;
}

.section__header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
}

/* Welcome Section */
.welcome {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.welcome__logo {
  width: 140px;
  height: 140px;
  object-fit: contain;
  margin-bottom: 1rem;
}

.welcome__title {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--primary-color);
  margin-bottom: 0.5rem;
  line-height: 1.2;
}

.welcome__subtitle {
  font-size: 0.95rem;
  color: var(--warning-color);
  margin-bottom: 1.25rem;
}

.welcome__description {
  font-size: 1.1rem;
  color: var(--text-light);
  margin-bottom: 2rem;
  line-height: 1.6;
}

.welcome__actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* Button Styles */
.btn {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: var(--border-radius);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  font-size: 1rem;
  min-height: 48px;
  justify-content: center;
  margin: 10px;
}

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

.btn--primary:hover {
  background: var(--secondary-color);
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

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

.btn--secondary:hover {
  background: var(--light-accent);
  transform: translateY(-2px);
}

.btn--back {
  background: var(--accent-color);
  color: var(--white);
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
}

.btn--back:hover {
  background: var(--secondary-color);
}

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

/* Pet Selection */
.pet-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.pet-card {
  background: linear-gradient(135deg, var(--white), var(--background-color));
  border: 2px solid transparent;
  border-radius: var(--border-radius);
  padding: 2rem;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

.pet-card:hover {
  border-color: var(--accent-color);
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.pet-card::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0;
  background: radial-gradient(circle at top right, rgba(166, 123, 91, 0.25), transparent 60%);
  transition: var(--transition);
  pointer-events: none;
}

.pet-card:hover::after {
  opacity: 1;
}

.pet-card__icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  margin: 0 auto 1rem auto;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--accent-color);
  color: var(--primary-color);
  background: var(--background-color);
}

.pet-card__icon i {
  font-size: 2rem;
}

.pet-card[data-pet="dog"] .pet-card__icon {
  border-color: var(--accent-color);
}

.pet-card[data-pet="cat"] .pet-card__icon {
  border-color: var(--secondary-color);
}

.pet-card__title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--primary-color);
}

/* Tail Selection */
.tail-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.tail-card {
  background: var(--white);
  border: 2px solid transparent;
  border-radius: var(--border-radius);
  padding: 1.5rem;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: var(--shadow);
  text-align: center;
}

.tail-card:hover {
  border-color: var(--accent-color);
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.tail-card__visual {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.tail-card__title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: 0.5rem;
}

.tail-card__description {
  font-size: 0.9rem;
  color: var(--text-light);
  line-height: 1.4;
}

/* Context Selection */
.context-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}

.context-card {
  background: var(--white);
  border: 2px solid transparent;
  border-radius: var(--border-radius);
  padding: 1.5rem;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: var(--shadow);
  text-align: center;
}

.context-card:hover {
  border-color: var(--accent-color);
  transform: translateY(-2px);
}

.context-card__icon {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.context-card__title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--primary-color);
}

/* Signals Selection */
.signals-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}

.signal-card {
  background: var(--white);
  border: 2px solid transparent;
  border-radius: var(--border-radius);
  padding: 1rem;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: var(--shadow);
  text-align: center;
}

.signal-card:hover {
  border-color: var(--accent-color);
}

.signal-card.selected {
  border-color: var(--primary-color);
  background: var(--background-color);
}

.signal-card__icon {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.signal-card__title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary-color);
}

.signals-actions {
  margin-top: 2rem;
  text-align: center;
}

/* Results */
.results__content {
  background: var(--white);
  border-radius: var(--border-radius);
  padding: 2rem;
  box-shadow: var(--shadow);
  margin-bottom: 2rem;
}

.result-item {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--background-color);
}

.result-item:last-child {
  border-bottom: none;
  margin-bottom: 0;
}

.result-item__title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.result-item__description {
  color: var(--text-light);
  line-height: 1.6;
  margin-bottom: 1rem;
}

.result-item__tips {
  background: var(--background-color);
  padding: 1rem;
  border-radius: var(--border-radius);
  border-left: 4px solid var(--accent-color);
}

.result-item__tips h4 {
  color: var(--primary-color);
  margin-bottom: 0.5rem;
  font-size: 1rem;
}

.result-item__tips ul {
  list-style: none;
  padding-left: 0;
}

.result-item__tips li {
  margin-bottom: 0.5rem;
  padding-left: 1.5rem;
  position: relative;
}

.result-item__tips li:before {
  content: "•";
  color: var(--accent-color);
  position: absolute;
  left: 0;
}

.results__actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* Guide */
.guide__content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.guide-card {
  background: var(--white);
  border-radius: var(--border-radius);
  padding: 2rem;
  box-shadow: var(--shadow);
}

.guide-card__title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.guide-card__content {
  color: var(--text-light);
  line-height: 1.6;
}

.guide-card__content ul {
  list-style: none;
  padding-left: 0;
}

.guide-card__content li {
  margin-bottom: 0.5rem;
  padding-left: 1.5rem;
  position: relative;
}

.guide-card__content li:before {
  content: "→";
  color: var(--accent-color);
  position: absolute;
  left: 0;
}

/* Saved Results */
.saved-results__content {
  display: grid;
  gap: 1rem;
  margin-top: 2rem;
}

.saved-result {
  background: var(--white);
  border-radius: var(--border-radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.saved-result__info {
  flex: 1;
}

.saved-result__title {
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: 0.5rem;
}

.saved-result__date {
  font-size: 0.9rem;
  color: var(--text-light);
}

.saved-result__actions {
  display: flex;
  gap: 0.5rem;
}

.btn--small {
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
  min-height: 36px;
}

/* Footer */
.footer {
  background: var(--primary-color);
  color: var(--background-color);
  text-align: center;
  padding: 2rem 0 2rem;
  margin-top: auto;
}

.footer__text {
  font-size: 0.9rem;
}

.footer__link {
  color: var(--light-accent);
  text-decoration: none;
  font-weight: 600;
}

.footer__link:hover {
  text-decoration: underline;
}

/* Loading Overlay */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(60, 36, 21, 0.8);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  backdrop-filter: blur(5px);
}

.loading-logo {
  width: 64px;
  height: 64px;
  object-fit: contain;
  margin-bottom: 1rem;
}

.loading-spinner {
  width: 50px;
  height: 50px;
  border: 4px solid var(--background-color);
  border-top: 4px solid var(--accent-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-bottom: 1rem;
}

.loading-text {
  color: var(--background-color);
  font-size: 1.1rem;
  font-weight: 600;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1001;
  backdrop-filter: blur(5px);
}

.modal {
  background: var(--white);
  border-radius: var(--border-radius);
  max-width: 500px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: var(--shadow-hover);
}

.modal__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem;
  border-bottom: 1px solid var(--background-color);
}

.modal__title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary-color);
}

.modal__close {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-light);
  padding: 0.5rem;
  border-radius: 50%;
  transition: var(--transition);
}

.modal__close:hover {
  background: var(--background-color);
}

.modal__content {
  padding: 1.5rem;
}

.modal__message {
  color: var(--text-light);
  line-height: 1.6;
}

.modal__actions {
  padding: 1.5rem;
  border-top: 1px solid var(--background-color);
  display: flex;
  justify-content: flex-end;
  gap: 1rem;
}

/* Utility Classes */
.hidden {
  display: none !important;
}

.text-center {
  text-align: center;
}

.text-error {
  color: var(--error-color);
}

.text-success {
  color: var(--success-color);
}

.text-warning {
  color: var(--warning-color);
}

.mb-1 {
  margin-bottom: 1rem;
}

.mb-2 {
  margin-bottom: 2rem;
}

.mt-1 {
  margin-top: 1rem;
}

.mt-2 {
  margin-top: 2rem;
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 0 0.75rem;
  }

  .welcome__title {
    font-size: 2rem;
  }

  .welcome__actions {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    max-width: 300px;
  }

  .section__header {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }

  .pet-grid {
    grid-template-columns: 1fr;
  }

  .tail-grid {
    grid-template-columns: 1fr;
  }

  .context-grid {
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  }

  .signals-grid {
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  }

  .guide__content {
    grid-template-columns: 1fr;
  }

  .results__actions {
    flex-direction: column;
    align-items: center;
  }

  .saved-result {
    flex-direction: column;
    align-items: stretch;
  }

  .saved-result__actions {
    justify-content: center;
  }

  .modal {
    width: 95%;
    margin: 1rem;
  }
}

@media (max-width: 480px) {
  .header .container {
    padding: 0.75rem;
  }

  .header__title {
    font-size: 1.25rem;
  }

  .nav__btn {
    width: 34px;
    height: 34px;
  }

  .main {
    padding: 1rem 0;
  }

  .section__title {
    font-size: 1.5rem;
  }

  .welcome__title {
    font-size: 1.75rem;
  }

  .welcome__description {
    font-size: 1rem;
  }

  .context-grid {
    grid-template-columns: 1fr;
  }

  .signals-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.4);
  }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus styles for accessibility */
button:focus,
.btn:focus,
.pet-card:focus,
.tail-card:focus,
.context-card:focus,
.signal-card:focus {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

/* Print styles */
@media print {
  .header,
  .footer,
  .btn,
  .loading-overlay,
  .modal-overlay {
    display: none !important;
  }
  
  .main {
    padding: 0;
  }
  
  .results__content,
  .guide__content {
    box-shadow: none;
    border: 1px solid #000;
  }
}