/* Icon Styles */
.icon {
  width: 1em;
  height: 1em;
  display: inline-block;
  vertical-align: middle;
  flex-shrink: 0;
  stroke: currentColor;
  fill: currentColor;
}

.icon[fill="currentColor"] {
  fill: currentColor;
}

.icon[stroke="currentColor"] {
  stroke: currentColor;
}

.icon--small {
  width: 0.875em;
  height: 0.875em;
}

.icon--large {
  width: 1.5em;
  height: 1.5em;
}

.icon--xl {
  width: 2em;
  height: 2em;
}

.icon--2xl {
  width: 3em;
  height: 3em;
}

.icon--3xl {
  width: 4em;
  height: 4em;
}

.icon--6xl {
  width: 6rem;
  height: 6rem;
}

/* CSS Custom Properties */
:root {
  /* Color Palette */
  --primary-color: #3C2415;
  --secondary-color: #6F4E37;
  --accent-color: #A67B5B;
  --light-accent: #C4915C;
  --background-color: #E6D5AA;
  
  /* Dark Theme Colors */
  --dark-primary: #E6D5AA;
  --dark-secondary: #C4915C;
  --dark-accent: #A67B5B;
  --dark-light-accent: #6F4E37;
  --dark-background: #1a1a1a;
  --dark-surface: #2d2d2d;
  --dark-card: #3d3d3d;
  
  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  /* Layout */
  --container-max-width: 1200px;
  --border-radius: 12px;
  --border-radius-sm: 8px;
  --border-radius-lg: 16px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);
  
  /* Transitions */
  --transition-fast: 0.15s ease-in-out;
  --transition-normal: 0.3s ease-in-out;
  --transition-slow: 0.5s ease-in-out;
  
  /* Z-index */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal: 1040;
  --z-toast: 1050;
}

/* Dark Theme */
[data-theme="dark"] {
  --primary-color: var(--dark-primary);
  --secondary-color: var(--dark-secondary);
  --accent-color: var(--dark-accent);
  --light-accent: var(--dark-light-accent);
  --background-color: var(--dark-background);
  --surface-color: var(--dark-surface);
  --card-color: var(--dark-card);
  --text-color: #ffffff;
  --text-secondary: #cccccc;
  --border-color: #444444;
}

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

html {
  font-size: 16px;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
  -ms-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--primary-color);
  background-color: var(--background-color);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Container */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* Header */
.header {
  background-color: var(--primary-color);
  color: var(--background-color);
  padding: var(--spacing-lg) 0;
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
}

[data-theme="dark"] .header {
  background-color: var(--dark-surface);
  color: var(--dark-primary);
}

.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-md);
}

.header__left {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  flex: 1;
}

.header__right {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.header__link {
  display: flex;
  align-items: center;
  text-decoration: none;
  color: inherit;
  transition: opacity var(--transition-fast);
}

.header__link:hover {
  opacity: 0.8;
}

.header__icon {
  width: 3rem;
  height: 3rem;
  object-fit: contain;
  flex-shrink: 0;
  display: block;
}

.header__title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  margin: 0;
  display: flex;
  align-items: center;
}

.header__title-link {
  text-decoration: none;
  color: inherit;
  transition: opacity var(--transition-fast);
}

.header__title-link:hover {
  opacity: 0.8;
}

.menu-icon {
  font-size: var(--font-size-xl);
}

.header__controls {
  display: flex;
  gap: var(--spacing-sm);
}

/* Main Content */
.main {
  min-height: calc(100vh - 200px);
  padding: var(--spacing-xl) 0;
}

.main-content {
  opacity: 1;
  transition: opacity var(--transition-normal);
}

.main-content.loading {
  opacity: 0.5;
  pointer-events: none;
}

/* Pages */
.page {
  display: block;
  animation: fadeIn 0.4s ease-out;
  opacity: 1;
}

.page[style*="display: none"] {
  animation: fadeOut 0.2s ease-in;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(15px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeOut {
  from {
    opacity: 1;
    transform: translateY(0);
  }
  to {
    opacity: 0;
    transform: translateY(-10px);
  }
}

/* Loading Screen */
.loading-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--background-color) 0%, var(--light-accent) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  opacity: 1;
  transition: opacity 0.5s ease-out, visibility 0.5s ease-out;
  visibility: visible;
}

[data-theme="dark"] .loading-screen {
  background: linear-gradient(135deg, var(--dark-background) 0%, var(--dark-surface) 100%);
}

.loading-screen[aria-hidden="true"] {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loading-screen__content {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xl);
  animation: contentFadeIn 0.8s ease-out;
}

@keyframes contentFadeIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.loading-screen__logo {
  animation: logoFloat 3s ease-in-out infinite;
  margin-bottom: var(--spacing-md);
}

.loading-screen__logo-img {
  width: 120px;
  height: 120px;
  object-fit: contain;
  filter: drop-shadow(0 10px 20px rgba(0, 0, 0, 0.2));
}

[data-theme="dark"] .loading-screen__logo-img {
  filter: drop-shadow(0 10px 20px rgba(255, 255, 255, 0.1));
}

.loading-screen__title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--primary-color);
  margin: 0;
  animation: titleFadeIn 1s ease-out;
  letter-spacing: -0.5px;
}

[data-theme="dark"] .loading-screen__title {
  color: var(--dark-primary);
}

.loading-screen__spinner {
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
  justify-content: center;
  margin-top: var(--spacing-lg);
}

.loading-screen__spinner-ring {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--primary-color);
  animation: spinnerBounce 1.4s ease-in-out infinite;
}

[data-theme="dark"] .loading-screen__spinner-ring {
  background-color: var(--dark-primary);
}

.loading-screen__spinner-ring:nth-child(1) {
  animation-delay: 0s;
}

.loading-screen__spinner-ring:nth-child(2) {
  animation-delay: 0.2s;
}

.loading-screen__spinner-ring:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes logoFloat {
  0%, 100% {
    transform: translateY(0) scale(1);
  }
  50% {
    transform: translateY(-20px) scale(1.05);
  }
}

@keyframes titleFadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes spinnerBounce {
  0%, 80%, 100% {
    transform: scale(0.8);
    opacity: 0.5;
  }
  40% {
    transform: scale(1.2);
    opacity: 1;
  }
}

/* Loading State (old - kept for compatibility) */
.loading-state {
  display: none;
  text-align: center;
  padding: var(--spacing-2xl);
}

.loading-state[aria-hidden="false"] {
  display: block;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--light-accent);
  border-top: 4px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto var(--spacing-md);
}

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

.loading-text {
  font-size: var(--font-size-lg);
  color: var(--secondary-color);
}

/* Error State */
.error-state {
  display: none;
  text-align: center;
  padding: var(--spacing-2xl);
}

.error-state[aria-hidden="false"] {
  display: block;
}

.error-icon {
  font-size: 4rem;
  margin-bottom: var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.error-icon .icon {
  width: 4rem;
  height: 4rem;
}

.error-title {
  font-size: var(--font-size-2xl);
  color: var(--primary-color);
  margin-bottom: var(--spacing-md);
}

.error-message {
  font-size: var(--font-size-lg);
  color: var(--secondary-color);
  margin-bottom: var(--spacing-xl);
}

/* Sections */
.section {
  margin-bottom: var(--spacing-2xl);
}

.section__title {
  font-size: var(--font-size-2xl);
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: var(--spacing-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.section__title::before {
  content: '';
  width: 4px;
  height: 2rem;
  background-color: var(--accent-color);
  border-radius: 2px;
}

/* Cards */
.card {
  background-color: white;
  border-radius: var(--border-radius);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  margin-bottom: var(--spacing-lg);
  transition: box-shadow var(--transition-normal), background-color var(--transition-normal), transform var(--transition-normal);
  animation: slideInUp 0.4s ease-out backwards;
}

.card:nth-child(1) { animation-delay: 0.05s; }
.card:nth-child(2) { animation-delay: 0.1s; }
.card:nth-child(3) { animation-delay: 0.15s; }
.card:nth-child(4) { animation-delay: 0.2s; }
.card:nth-child(n+5) { animation-delay: 0.25s; }

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

[data-theme="dark"] .card {
  background-color: var(--dark-card);
  color: var(--dark-primary);
}

.card__title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: var(--spacing-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

[data-theme="dark"] .card__title {
  color: var(--dark-primary);
}

.card__icon {
  font-size: var(--font-size-2xl);
  display: flex;
  align-items: center;
  justify-content: center;
}

.card__icon .icon {
  width: 1.5rem;
  height: 1.5rem;
}

/* Forms */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  font-weight: 500;
  color: var(--primary-color);
  margin-bottom: var(--spacing-sm);
  font-size: var(--font-size-sm);
}

[data-theme="dark"] .form-label {
  color: var(--dark-primary);
}

.form-input,
.form-select {
  width: 100%;
  padding: var(--spacing-md);
  border: 2px solid var(--light-accent);
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-base);
  font-family: inherit;
  background-color: white;
  color: var(--primary-color);
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal), transform var(--transition-fast);
}

.form-input:focus,
.form-select:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(166, 123, 91, 0.15);
  transform: translateY(-1px);
}

.form-input:not(:placeholder-shown):valid,
.form-select:valid {
  border-color: #10b981;
}

.form-input:not(:placeholder-shown):valid:focus,
.form-select:valid:focus {
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

.form-input:invalid,
.form-input.error {
  border-color: #dc2626;
}

.form-select.error {
  border-color: #dc2626;
}

[data-theme="dark"] .form-input,
[data-theme="dark"] .form-select {
  background-color: var(--dark-surface);
  color: var(--dark-primary);
  border-color: var(--dark-light-accent);
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
}

@media (min-width: 768px) {
  .form-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.form-error {
  color: #dc2626;
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-xs);
  min-height: 1.25rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  border: none;
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-base);
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition-normal);
  text-decoration: none;
  min-height: 44px;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn:active::before {
  width: 300px;
  height: 300px;
}

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

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

.btn--primary:hover:not(:disabled) {
  background-color: var(--secondary-color);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn--primary:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

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

.btn--secondary:hover:not(:disabled) {
  background-color: var(--accent-color);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn--secondary:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.btn--icon {
  padding: var(--spacing-sm);
  background-color: transparent;
  color: currentColor;
  min-height: 40px;
  width: 40px;
}

.btn--icon:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.btn__icon {
  font-size: var(--font-size-lg);
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn__icon .icon {
  width: 1.125rem;
  height: 1.125rem;
}

/* Results */
.results-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

@media (min-width: 768px) {
  .results-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.result-card {
  background-color: white;
  border-radius: var(--border-radius);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  animation: resultCardFadeIn 0.5s ease-out backwards;
}

.result-card:nth-child(1) { animation-delay: 0.1s; }
.result-card:nth-child(2) { animation-delay: 0.2s; }
.result-card:nth-child(3) { animation-delay: 0.3s; }

.result-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

@keyframes resultCardFadeIn {
  from {
    opacity: 0;
    transform: translateY(15px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

[data-theme="dark"] .result-card {
  background-color: var(--dark-card);
}

.result-card__icon {
  font-size: var(--font-size-3xl);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.result-card__icon .icon {
  width: 2.5rem;
  height: 2.5rem;
}

.result-card__content {
  flex: 1;
}

.result-card__title {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--secondary-color);
  margin-bottom: var(--spacing-xs);
}

[data-theme="dark"] .result-card__title {
  color: var(--dark-secondary);
}

.result-card__value {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--primary-color);
}

[data-theme="dark"] .result-card__value {
  color: var(--dark-primary);
}

/* Chart */
.chart-container {
  position: relative;
  margin-bottom: var(--spacing-lg);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 300px;
}

.chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  justify-content: center;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-sm);
}

.legend-color {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* Projections */
.projections-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
}

@media (min-width: 768px) {
  .projections-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.projection-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md);
  background-color: var(--background-color);
  border-radius: var(--border-radius-sm);
  border: 2px solid var(--light-accent);
}

[data-theme="dark"] .projection-item {
  background-color: var(--dark-surface);
  border-color: var(--dark-light-accent);
}

.projection-label {
  font-weight: 500;
  color: var(--secondary-color);
}

[data-theme="dark"] .projection-label {
  color: var(--dark-secondary);
}

.projection-value {
  font-weight: 700;
  color: var(--primary-color);
  font-size: var(--font-size-lg);
}

[data-theme="dark"] .projection-value {
  color: var(--dark-primary);
}

/* Action Buttons */
.action-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  justify-content: center;
}

@media (min-width: 768px) {
  .action-buttons {
    justify-content: flex-start;
  }
}

/* Footer */
.footer {
  background-color: var(--primary-color);
  color: var(--background-color);
  padding: var(--spacing-lg) 0;
  text-align: center;
  margin-top: 39px;
}

[data-theme="dark"] .footer {
  background-color: var(--dark-surface);
  color: var(--dark-primary);
}

.footer__text {
  font-size: var(--font-size-sm);
}

.footer__separator {
  margin: 0 var(--spacing-sm);
  color: var(--secondary-color);
}

.footer__link {
  color: var(--light-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: var(--accent-color);
  text-decoration: underline;
}

[data-theme="dark"] .footer__link {
  color: var(--dark-secondary);
}

/* Toast Notifications */
.toast {
  position: fixed;
  top: 20px;
  right: 20px;
  background-color: white;
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-xl);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  max-width: 400px;
  z-index: var(--z-toast);
  transform: translateX(120%) scale(0.9);
  opacity: 0;
  transition: transform var(--transition-normal), opacity var(--transition-normal), box-shadow var(--transition-normal);
  animation: toastSlideIn 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55) forwards;
}

.toast[aria-hidden="false"] {
  transform: translateX(0) scale(1);
  opacity: 1;
}

.toast[aria-hidden="true"] {
  animation: toastSlideOut 0.3s ease-in forwards;
}

@keyframes toastSlideIn {
  from {
    transform: translateX(120%) scale(0.9);
    opacity: 0;
  }
  to {
    transform: translateX(0) scale(1);
    opacity: 1;
  }
}

@keyframes toastSlideOut {
  from {
    transform: translateX(0) scale(1);
    opacity: 1;
  }
  to {
    transform: translateX(120%) scale(0.9);
    opacity: 0;
  }
}

.toast--success {
  border-left: 4px solid #10b981;
}

.toast--error {
  border-left: 4px solid #dc2626;
}

[data-theme="dark"] .toast {
  background-color: var(--dark-card);
  color: var(--dark-primary);
}

.toast__icon {
  font-size: var(--font-size-xl);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.toast__icon .icon {
  width: 1.5rem;
  height: 1.5rem;
}

.toast__content {
  flex: 1;
}

.toast__title {
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.toast__message {
  font-size: var(--font-size-sm);
  color: var(--secondary-color);
}

[data-theme="dark"] .toast__message {
  color: var(--dark-secondary);
}

/* Responsive Design */
@media (max-width: 767px) {
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .header__title {
    font-size: var(--font-size-xl);
  }
  
  .section__title {
    font-size: var(--font-size-xl);
  }
  
  .card {
    padding: var(--spacing-lg);
  }
  
  .form-grid {
    grid-template-columns: 1fr;
  }
  
  .results-grid {
    grid-template-columns: 1fr;
  }
  
  .projections-grid {
    grid-template-columns: 1fr;
  }
  
  .action-buttons {
    flex-direction: column;
  }
  
  .btn {
    width: 100%;
  }
  
  .toast {
    right: var(--spacing-sm);
    left: var(--spacing-sm);
    max-width: none;
  }
}

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

/* High contrast mode */
@media (prefers-contrast: high) {
  .btn {
    border: 2px solid currentColor;
  }
  
  .form-input,
  .form-select {
    border-width: 3px;
  }
}

/* Focus visible */
.btn:focus-visible,
.form-input:focus-visible,
.form-select:focus-visible {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

/* History Section */
.history-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
}

.history-description {
  color: var(--secondary-color);
  font-size: var(--font-size-sm);
  flex: 1;
  min-width: 200px;
}

[data-theme="dark"] .history-description {
  color: var(--dark-secondary);
}

.btn--small {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
  min-height: 36px;
}

.history-container {
  position: relative;
}

.history-empty {
  text-align: center;
  padding: var(--spacing-2xl);
  color: var(--secondary-color);
  font-style: italic;
}

[data-theme="dark"] .history-empty {
  color: var(--dark-secondary);
}

.history-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.history-item {
  background-color: var(--background-color);
  border: 2px solid var(--light-accent);
  border-radius: var(--border-radius-sm);
  padding: var(--spacing-lg);
  transition: all var(--transition-normal);
  position: relative;
  animation: historyItemFadeIn 0.4s ease-out backwards;
}

.history-item:nth-child(1) { animation-delay: 0.05s; }
.history-item:nth-child(2) { animation-delay: 0.1s; }
.history-item:nth-child(3) { animation-delay: 0.15s; }
.history-item:nth-child(4) { animation-delay: 0.2s; }
.history-item:nth-child(n+5) { animation-delay: 0.25s; }

[data-theme="dark"] .history-item {
  background-color: var(--dark-surface);
  border-color: var(--dark-light-accent);
}

.history-item:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
  border-color: var(--accent-color);
}

@keyframes historyItemFadeIn {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.history-item__header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--spacing-md);
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.history-item__info {
  flex: 1;
  min-width: 200px;
}

.history-item__date {
  font-size: var(--font-size-sm);
  color: var(--secondary-color);
  margin-bottom: var(--spacing-xs);
}

[data-theme="dark"] .history-item__date {
  color: var(--dark-secondary);
}

.history-item__pet-name {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: var(--spacing-xs);
}

[data-theme="dark"] .history-item__pet-name {
  color: var(--dark-primary);
}

.history-item__pet-details {
  font-size: var(--font-size-sm);
  color: var(--secondary-color);
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

[data-theme="dark"] .history-item__pet-details {
  color: var(--dark-secondary);
}

.history-item__actions {
  display: flex;
  gap: var(--spacing-sm);
  flex-shrink: 0;
}

.history-item__totals {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--light-accent);
}

[data-theme="dark"] .history-item__totals {
  border-top-color: var(--dark-light-accent);
}

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

.history-item__total-label {
  font-size: var(--font-size-xs);
  color: var(--secondary-color);
  margin-bottom: var(--spacing-xs);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

[data-theme="dark"] .history-item__total-label {
  color: var(--dark-secondary);
}

.history-item__total-value {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--primary-color);
}

[data-theme="dark"] .history-item__total-value {
  color: var(--dark-primary);
}

.history-item__note {
  font-size: var(--font-size-xs);
  color: var(--secondary-color);
  font-style: italic;
  margin-top: var(--spacing-sm);
  padding-top: var(--spacing-sm);
  border-top: 1px solid var(--light-accent);
}

[data-theme="dark"] .history-item__note {
  color: var(--dark-secondary);
  border-top-color: var(--dark-light-accent);
}

.btn--icon-only {
  padding: var(--spacing-sm);
  min-width: 36px;
  width: 36px;
  height: 36px;
}

/* Sidebar Menu */
.menu-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: var(--z-modal);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.menu-overlay[aria-hidden="false"] {
  opacity: 1;
  visibility: visible;
}

.sidebar-menu {
  position: fixed;
  top: 0;
  left: 0;
  width: 280px;
  max-width: 85vw;
  height: 100%;
  background-color: white;
  box-shadow: var(--shadow-xl);
  z-index: calc(var(--z-modal) + 1);
  transform: translateX(-100%);
  transition: transform var(--transition-normal);
  overflow-y: auto;
}

.sidebar-menu--right {
  left: auto;
  right: 0;
  transform: translateX(100%);
}

[data-theme="dark"] .sidebar-menu {
  background-color: var(--dark-card);
}

.sidebar-menu[aria-hidden="false"] {
  transform: translateX(0);
}

.sidebar-menu--right[aria-hidden="false"] {
  transform: translateX(0);
}

.sidebar-menu__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--light-accent);
}

[data-theme="dark"] .sidebar-menu__header {
  border-bottom-color: var(--dark-light-accent);
}

.sidebar-menu__title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--primary-color);
}

.sidebar-menu__title-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  text-decoration: none;
  color: inherit;
  transition: opacity var(--transition-fast);
  width: 100%;
}

.sidebar-menu__title-link:hover {
  opacity: 0.8;
}

[data-theme="dark"] .sidebar-menu__title {
  color: var(--dark-primary);
}

.sidebar-menu__icon {
  width: 1.5rem;
  height: 1.5rem;
  object-fit: contain;
  display: block;
  flex-shrink: 0;
}

.sidebar-menu__list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.sidebar-menu__item {
  border-bottom: 1px solid var(--light-accent);
}

[data-theme="dark"] .sidebar-menu__item {
  border-bottom-color: var(--dark-light-accent);
}

.sidebar-menu__link {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  color: var(--primary-color);
  text-decoration: none;
  transition: all var(--transition-normal);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.sidebar-menu__link::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  width: 4px;
  background-color: var(--accent-color);
  transform: scaleY(0);
  transition: transform var(--transition-normal);
}

[data-theme="dark"] .sidebar-menu__link {
  color: var(--dark-primary);
}

.sidebar-menu__link:hover {
  background-color: var(--background-color);
  transform: translateX(4px);
  padding-left: calc(var(--spacing-lg) + 4px);
}

.sidebar-menu__link:hover::before {
  transform: scaleY(1);
}

[data-theme="dark"] .sidebar-menu__link:hover {
  background-color: var(--dark-surface);
}

.sidebar-menu__link.active {
  background-color: var(--light-accent);
  color: white;
  font-weight: 600;
  padding-left: calc(var(--spacing-lg) + 4px);
}

.sidebar-menu__link.active::before {
  transform: scaleY(1);
  background-color: white;
}

[data-theme="dark"] .sidebar-menu__link.active {
  background-color: var(--dark-light-accent);
}

.sidebar-menu__link-icon {
  font-size: var(--font-size-xl);
  width: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.sidebar-menu__link-icon .icon {
  width: 1.25rem;
  height: 1.25rem;
}

.sidebar-menu__link-text {
  flex: 1;
}

/* Hero Section */
.hero {
  padding: var(--spacing-2xl) 0;
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero__content {
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
  padding: var(--spacing-2xl);
}

.hero__icon {
  margin-bottom: var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  animation: float 3s ease-in-out infinite;
}

.hero__logo {
  width: 10rem;
  height: 10rem;
  object-fit: contain;
  display: block;
}

@keyframes float {
  0%, 100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-20px);
  }
}

.hero__title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: var(--spacing-lg);
  line-height: 1.2;
}

@media (min-width: 768px) {
  .hero__title {
    font-size: 4rem;
  }
}

[data-theme="dark"] .hero__title {
  color: var(--dark-primary);
}

.hero__description {
  font-size: var(--font-size-lg);
  color: var(--secondary-color);
  margin-bottom: var(--spacing-2xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.8;
}

@media (min-width: 768px) {
  .hero__description {
    font-size: var(--font-size-xl);
  }
}

[data-theme="dark"] .hero__description {
  color: var(--dark-secondary);
}

.hero__actions {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

.btn--large {
  padding: var(--spacing-lg) var(--spacing-xl);
  font-size: var(--font-size-lg);
  min-height: 56px;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-normal);
}

.btn--large:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

/* Settings Page */
.settings-options {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.settings-options .btn {
  flex: 1;
  min-width: 120px;
}

.settings-options .btn.active {
  background-color: var(--primary-color);
  color: white;
}

[data-theme="dark"] .settings-options .btn.active {
  background-color: var(--dark-primary);
  color: var(--dark-background);
}

.about-content {
  padding: var(--spacing-md) 0;
}

.about-text {
  color: var(--secondary-color);
  line-height: 1.6;
  margin-bottom: var(--spacing-md);
}

[data-theme="dark"] .about-text {
  color: var(--dark-secondary);
}

.about-version {
  color: var(--secondary-color);
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-sm);
}

[data-theme="dark"] .about-version {
  color: var(--dark-secondary);
}

.about-author {
  color: var(--secondary-color);
  font-size: var(--font-size-sm);
}

[data-theme="dark"] .about-author {
  color: var(--dark-secondary);
}

@media (max-width: 767px) {
  .history-header {
    flex-direction: column;
  }
  
  .history-item__header {
    flex-direction: column;
  }
  
  .history-item__actions {
    width: 100%;
    justify-content: flex-end;
  }
  
  .history-item__totals {
    grid-template-columns: 1fr;
  }
  
  .hero {
    min-height: 50vh;
    padding: var(--spacing-xl) 0;
  }
  
  .hero__content {
    padding: var(--spacing-lg);
  }
  
  .hero__logo {
    width: 8rem;
    height: 8rem;
  }
  
  .hero__title {
    font-size: var(--font-size-2xl);
  }
  
  .hero__description {
    font-size: var(--font-size-base);
  }
  
  .sidebar-menu {
    width: 100%;
    max-width: 100%;
  }
  
  .header__left {
    gap: var(--spacing-xs);
  }
  
  .header__title {
    font-size: var(--font-size-lg);
  }
  
  .header__icon {
    width: 2rem;
    height: 2rem;
  }
  
  .header__right {
    gap: var(--spacing-xs);
  }
  
  .header__controls {
    gap: var(--spacing-xs);
  }
  
  .settings-options {
    flex-direction: column;
  }
  
  .settings-options .btn {
    width: 100%;
  }
}

/* Print styles */
@media print {
  .header__controls,
  .action-buttons,
  .toast {
    display: none !important;
  }
  
  .card {
    box-shadow: none;
    border: 1px solid #ccc;
  }
  
  body {
    background-color: white !important;
    color: black !important;
  }
}

/* FAQ Styles */
.faq-intro {
  font-size: var(--font-size-lg);
  color: var(--secondary-color);
  margin-bottom: var(--spacing-2xl);
  text-align: center;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

[data-theme="dark"] .faq-intro {
  color: var(--dark-secondary);
}

.faq-container {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  margin-bottom: var(--spacing-md);
  border: 2px solid var(--light-accent);
  border-radius: var(--border-radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

[data-theme="dark"] .faq-item {
  border-color: var(--dark-accent);
}

.faq-item:hover {
  border-color: var(--primary-color);
}

[data-theme="dark"] .faq-item:hover {
  border-color: var(--dark-primary);
}

.faq-question {
  width: 100%;
  padding: var(--spacing-lg);
  background-color: var(--background-color);
  border: none;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-md);
  transition: background-color var(--transition-fast);
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--text-color);
}

.faq-question:hover {
  background-color: var(--light-accent);
}

[data-theme="dark"] .faq-question {
  background-color: var(--dark-background);
  color: var(--dark-text);
}

[data-theme="dark"] .faq-question:hover {
  background-color: var(--dark-accent);
}

.faq-question__text {
  flex: 1;
}

.faq-question__icon {
  font-size: var(--font-size-xl);
  font-weight: 300;
  color: var(--primary-color);
  transition: transform var(--transition-fast);
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
}

[data-theme="dark"] .faq-question__icon {
  color: var(--dark-primary);
}

.faq-item--open .faq-question__icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal), padding var(--transition-normal), opacity var(--transition-normal);
  padding: 0 var(--spacing-lg);
  background-color: var(--background-color);
  opacity: 0;
}

.faq-item--open .faq-answer {
  max-height: 1000px;
  padding: var(--spacing-lg);
  opacity: 1;
}

[data-theme="dark"] .faq-answer {
  background-color: var(--dark-background);
}

.faq-answer p {
  margin: 0;
  color: var(--secondary-color);
  line-height: 1.6;
}

[data-theme="dark"] .faq-answer p {
  color: var(--dark-secondary);
}

.faq-contact-text {
  color: var(--secondary-color);
  margin-bottom: var(--spacing-lg);
  text-align: center;
}

[data-theme="dark"] .faq-contact-text {
  color: var(--dark-secondary);
}

.action-buttons {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

@media (max-width: 767px) {
  .hero__actions {
    flex-direction: column;
    width: 100%;
  }
  
  .hero__actions .btn {
    width: 100%;
  }
  
  .action-buttons {
    flex-direction: column;
  }
  
  .action-buttons .btn {
    width: 100%;
  }
  
  .faq-question {
    padding: var(--spacing-md);
    font-size: var(--font-size-sm);
  }
  
  .faq-answer {
    padding: 0 var(--spacing-md);
  }
  
  .faq-item--open .faq-answer {
    padding: var(--spacing-md);
  }
}

/* Privacy Page Styles */
.privacy-intro {
  font-size: var(--font-size-lg);
  color: var(--secondary-color);
  margin-bottom: var(--spacing-md);
  text-align: center;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

[data-theme="dark"] .privacy-intro {
  color: var(--dark-secondary);
}

.privacy-updated {
  text-align: center;
  color: var(--secondary-color);
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-2xl);
}

[data-theme="dark"] .privacy-updated {
  color: var(--dark-secondary);
}

.privacy-content {
  line-height: 1.8;
}

.privacy-content p {
  margin-bottom: var(--spacing-md);
  color: var(--text-color);
}

[data-theme="dark"] .privacy-content p {
  color: var(--dark-text);
}

.privacy-content ul {
  margin: var(--spacing-md) 0;
  padding-left: var(--spacing-xl);
  color: var(--text-color);
}

[data-theme="dark"] .privacy-content ul {
  color: var(--dark-text);
}

.privacy-content li {
  margin-bottom: var(--spacing-sm);
}

.privacy-content strong {
  color: var(--primary-color);
  font-weight: 600;
}

[data-theme="dark"] .privacy-content strong {
  color: var(--dark-primary);
}

.privacy-contact {
  margin: var(--spacing-md) 0;
  color: var(--text-color);
}

[data-theme="dark"] .privacy-contact {
  color: var(--dark-text);
}

.privacy-contact-link {
  color: var(--primary-color);
  text-decoration: none;
  transition: opacity var(--transition-fast);
}

.privacy-contact-link:hover {
  opacity: 0.8;
  text-decoration: underline;
}

[data-theme="dark"] .privacy-contact-link {
  color: var(--dark-primary);
}

@media (max-width: 767px) {
  .privacy-content ul {
    padding-left: var(--spacing-lg);
  }
}

/* Share Section Styles */
.share-url-container {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}

.share-url-input {
  flex: 1;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 2px solid var(--light-accent);
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-sm);
  background-color: var(--background-color);
  color: var(--text-color);
  font-family: var(--font-family);
}

[data-theme="dark"] .share-url-input {
  border-color: var(--dark-accent);
  background-color: var(--dark-background);
  color: var(--dark-text);
}

.share-url-input:focus {
  outline: none;
  border-color: var(--primary-color);
}

[data-theme="dark"] .share-url-input:focus {
  border-color: var(--dark-primary);
}

.share-buttons {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-sm);
}

.btn--share {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.btn--facebook {
  background-color: #1877F2;
  color: white;
}

.btn--facebook:hover {
  background-color: #166FE5;
  opacity: 0.9;
}

.btn--twitter {
  background-color: #1DA1F2;
  color: white;
}

.btn--twitter:hover {
  background-color: #1A91DA;
  opacity: 0.9;
}

.btn--whatsapp {
  background-color: #25D366;
  color: white;
}

.btn--whatsapp:hover {
  background-color: #22C55E;
  opacity: 0.9;
}

.btn--linkedin {
  background-color: #0077B5;
  color: white;
}

.btn--linkedin:hover {
  background-color: #006399;
  opacity: 0.9;
}

.btn--share .btn__icon {
  width: 1rem;
  height: 1rem;
}

@media (max-width: 767px) {
  .share-url-container {
    flex-direction: column;
  }
  
  .share-buttons {
    grid-template-columns: 1fr;
  }
}