/* --- THEME & VARIABLES --- */
:root {
  --primary: #2364a1;
  --background-light: #f5f7f8;
  --foreground-light: #101c22;
  --card-light: #ffffff;
  --border-light: #e5e7eb;
  --muted-light: #6b7280;
  --brand-color: var(--primary);
  --brand-color-hover: #1181e0;
  --brand-color-light: #dbeafe;
  --success-color: #16a34a;
  --success-color-hover: #15803d;
  --text-primary: var(--foreground-light);
  --text-secondary: #374151;
  --text-light: var(--muted-light);
  --bg-body: var(--background-light);
  --bg-card: var(--card-light);
  --border-color: var(--border-light);
  --border-radius-lg: 0.75rem;
  --border-radius-md: 0.5rem;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
}

:root[data-theme="dark"] {
  --background-dark: #0f1923;
  --foreground-dark: #f6f7f8;
  --card-dark: #1a2830;
  --border-dark: #2d3748;
  --muted-dark: #9ca3af;
  --text-primary: var(--foreground-dark);
  --text-secondary: #d1d5db;
  --text-light: var(--muted-dark);
  --bg-body: var(--background-dark);
  --bg-card: var(--card-dark);
  --border-color: var(--border-dark);
}

/* --- GLOBAL & RESET --- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  font-family: "Work Sans", sans-serif;
  background-color: var(--bg-body);
  color: var(--text-secondary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.3s, color 0.3s;
}
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

.static-page {
  padding: 1.5rem;
  background-color: var(--bg-card);
  border-radius: var(--border-radius-lg);
  margin-top: 1rem;
}

/* --- APP LAYOUT, HEADER, FOOTER --- */
.app-layout {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
#app-container {
  flex-grow: 1;
  padding-top: 1rem;
  padding-bottom: 6rem; /* Space for footer */
}
.app-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background-color: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-color);
}
.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}
.header-content h3 span {
  color: var(--brand-color-hover);
}
.header-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.icon-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--muted-light);
  padding: 0.5rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.2s, color 0.2s;
}
.icon-btn:hover {
  background-color: var(--border-color);
  color: var(--text-primary);
}
/* Hero section */
.hero-section {
  text-align: center;
  margin: 10px;
  padding: 5px;
}
.hero-section span {
  font-weight: 600;
  color: var(--brand-color-hover);
}
.app-footer {
  position: fixed; /* Changed for native feel */
  bottom: 0;
  left: 0;
  right: 0;
  background-color: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(8px);
  border-top: 1px solid var(--border-color);
  z-index: 10;
}
.footer-nav {
  display: flex;
  justify-content: space-around;
  height: 5rem;
}
.nav-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  color: var(--muted-light);
  transition: color 0.2s;
  flex-grow: 1;
}
.nav-btn.active {
  color: var(--primary);
}
.nav-btn.active .material-symbols-outlined {
  font-variation-settings: "FILL" 1;
}
.nav-text {
  font-size: 0.75rem;
  font-weight: 500;
  margin-top: 0.25rem;
}

:root[data-theme="dark"] .app-header,
:root[data-theme="dark"] .app-footer {
  background-color: rgba(15, 25, 35, 0.8);
}
:root[data-theme="dark"] .static-page {
  color: var(--text-light);
}
:root[data-theme="dark"] h2,
:root[data-theme="dark"] h3 {
  color: var(--text-primary);
}

/* --- HOME PAGE & CALCULATOR STYLES --- */
.welcome-header {
  margin-bottom: 2rem;
  text-align: center;
}
.welcome-header h2 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
}
.welcome-header p {
  color: var(--text-light);
}
.categories-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-primary);
}
.calculator-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}
@media (min-width: 640px) {
  .calculator-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}
@media (min-width: 768px) {
  .calculator-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}
.category-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1.5rem 1rem;
  background-color: var(--bg-card);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-sm);
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s;
  border: 1px solid var(--border-color);
}
.category-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}
.category-card .icon-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 4rem;
  width: 4rem;
  border-radius: 50%;
  background-color: var(--brand-color-light);
  margin-bottom: 0.75rem;
}
.category-card .material-symbols-outlined {
  color: var(--brand-color-hover);
  font-size: 2rem;
}
.category-card p {
  font-weight: 600;
  text-align: center;
  font-size: 0.875rem;
  color: var(--text-primary);
}

/* --- FORM & INPUT STYLES --- */
main form {
  background-color: var(--bg-card);
  padding: 1.5rem;
  border-radius: 1.5rem;
  box-shadow: var(--shadow-md);
  margin-top: 1.5rem;
}
label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}
input[type="number"],
input[type="text"],
select {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  background-color: var(--bg-body);
  color: var(--text-primary);
  font-size: 1rem;
  transition: box-shadow 0.2s, border-color 0.2s;
}
input:focus,
select:focus {
  outline: none;
  border-color: var(--brand-color);
  box-shadow: 0 0 0 3px var(--brand-color-light);
}
.btn {
  border: none;
  font-weight: 600;
  padding: 0.875rem 1.5rem;
  border-radius: var(--border-radius-md);
  cursor: pointer;
  transition: background-color 0.2s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}
.quality-option {
  border: 2px solid var(--border-color);
}
.quality-option:has(input:checked) {
  background-color: var(--brand-color-light);
  border-color: var(--brand-color);
  box-shadow: 0 0 0 3px var(--brand-color-light);
}

/* --- CALCULATOR-SPECIFIC STYLES --- */
.calculator-header {
  text-align: center;
  margin-bottom: 2rem;
}
.calculator-header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}
.calculator-header p {
  color: var(--text-light);
  max-width: 600px;
  margin: 0 auto;
}
@media (min-width: 768px) {
  main form {
    padding: 2.5rem;
  }
}
.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}
.btn-primary {
  background-color: var(--brand-color);
  color: white;
}
.btn-primary:hover:not(:disabled) {
  background-color: var(--brand-color-hover);
}
.btn-secondary {
  background-color: var(--border-light);
  color: var(--text-secondary);
}
.btn-secondary:hover:not(:disabled) {
  background-color: #d1d5db;
}
:root[data-theme="dark"] .btn-secondary {
  background-color: var(--border-dark);
  color: var(--text-secondary);
}
.btn-submit {
  background-color: var(--success-color);
  color: white;
  font-weight: 700;
}
.btn-submit:hover:not(:disabled) {
  background-color: var(--success-color-hover);
}
.form-navigation {
  margin-top: 2.5rem;
  display: flex;
  justify-content: space-between;
  border-top: 1px solid var(--border-color);
  padding-top: 1.5rem;
}
.hidden {
  display: none !important;
}
.form-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}
@media (min-width: 640px) {
  .form-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* --- STEPPER --- */
.step-navigation {
  display: flex;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 2rem;
}
.step-btn {
  flex: 1;
  padding: 0.75rem 0.25rem;
  text-align: center;
  font-weight: 600;
  border: none;
  border-bottom: 3px solid transparent;
  background: none;
  cursor: default;
  color: var(--text-light);
  font-size: 0.875rem;
}
.step-btn.active {
  color: var(--brand-color);
  border-bottom-color: var(--brand-color);
}
.step {
  display: none;
}
.step.active {
  display: block;
  animation: fadeIn 0.5s;
}
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* --- OPTIONS & RESULTS --- */
.quality-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}
@media (min-width: 640px) {
  .quality-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}
.quality-option {
  padding: 1.5rem 1rem;
  border-radius: var(--border-radius-lg);
  cursor: pointer;
  text-align: center;
  transition: transform 0.2s;
}
.quality-option:hover {
  transform: scale(1.03);
}
.quality-option h3 {
  margin: 0 0 0.5rem 0;
  font-size: 1.125rem;
  color: var(--text-primary);
}
.quality-option p {
  font-size: 0.875rem;
  color: var(--text-light);
  margin: 0;
}
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}
#results {
  margin-top: 3rem;
}
.results-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
}
.results-header h2 {
  color: var(--text-primary);
}
.results-card {
  background-color: var(--bg-card);
  padding: 1.5rem;
  border-radius: 1.5rem;
  box-shadow: var(--shadow-md);
}
@media (min-width: 768px) {
  .results-card {
    padding: 2.5rem;
  }
}
.results-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: center;
}
@media (min-width: 768px) {
  .results-grid {
    grid-template-columns: 2fr 3fr;
  }
}
.chart-container {
  max-width: 20rem;
  width: 100%;
  margin: 0 auto;
}
#grandTotal {
  font-size: 3rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
}
.summary-item {
  display: flex;
  justify-content: space-between;
  font-size: 1rem;
}
.summary-details > .summary-item + .summary-item {
  margin-top: 1rem;
}
.summary-item span:first-child {
  color: var(--text-light);
}
.summary-item span:last-child {
  font-weight: 600;
  color: var(--text-secondary);
}
.summary-item-total {
  border-top: 1px solid var(--border-color);
  padding-top: 1rem;
}
.detailed-breakdown-container {
  margin-top: 2.5rem;
  border-top: 1px solid var(--border-color);
  padding-top: 2rem;
}
.detailed-breakdown-container h3 {
  color: var(--text-primary);
  margin-bottom: 1rem;
}
.item-card {
  background-color: var(--bg-body);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: 1.5rem;
  margin-top: 1rem;
}
.item-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}
.item-card-header h3 {
  color: var(--text-primary);
  margin: 0;
  font-size: 1rem;
}
.remove-item-btn {
  background: none;
  border: none;
  color: #ef4444;
  font-weight: 600;
  cursor: pointer;
  padding: 0.5rem;
}
.remove-item-btn:hover {
  color: #b91c1c;
}

/* about page */

/* About Page Styles */
.page-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-top: 1.5rem;
  padding-top: 1rem;
}

.page-content {
  color: var(--text-light);
  line-height: 1.75;
  margin-top: 1rem;
}

.page-content p {
  margin-bottom: 1rem;
}

.list {
  list-style-type: disc;
  padding-left: 1.5rem;
  margin-top: 0.5rem;
  margin-bottom: 1rem;
}

.list li {
  margin-bottom: 0.5rem;
}

/* FAQ & Disclaimer Styles */
.page-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.page-text {
  font-size: 1rem;
  color: var(--text-light);
  line-height: 1.75;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.faq-item {
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  background-color: var(--bg-card);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow 0.2s;
}

.faq-item[open] {
  box-shadow: var(--shadow-md);
}

.faq-summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem;
  cursor: pointer;
  list-style: none;
}

.faq-question {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-primary);
  margin: 0;
}

.faq-icon {
  font-size: 1.5rem;
  color: var(--text-light);
  transition: transform 0.3s ease;
}

.faq-item[open] .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 1rem 1rem 1rem;
}

.faq-answer p {
  font-size: 0.875rem;
  color: var(--text-light);
  margin: 0;
}

/* Spacing between sections */
.mt-8 {
  margin-top: 2rem;
}

/* Dark mode adjustments */
:root[data-theme="dark"] .faq-item {
  background-color: var(--card-dark);
  border-color: var(--border-dark);
}

:root[data-theme="dark"] .faq-question,
:root[data-theme="dark"] .page-title {
  color: var(--text-primary);
}

:root[data-theme="dark"] .faq-icon,
:root[data-theme="dark"] .page-text,
:root[data-theme="dark"] .faq-answer p {
  color: var(--text-light);
}

/* Privacy Policy Page */
.privacy-content {
  display: flex;
  flex-direction: column;
  gap: 2rem; /* space between sections */
  color: var(--text-light);
}

.section {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.page-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
}

.last-updated {
  font-size: 0.875rem;
  color: var(--text-light);
}

.section-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  border-bottom: 1px solid rgba(35, 100, 161, 0.3); /* primary / 30 */
  padding-bottom: 0.5rem;
}

.section p {
  font-size: 1rem;
  line-height: 1.75;
}

.list {
  list-style-type: disc;
  padding-left: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

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

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

/* Dark Mode */
:root[data-theme="dark"] .privacy-content {
  color: var(--text-light);
}

:root[data-theme="dark"] .page-title,
:root[data-theme="dark"] .section-title {
  color: var(--text-primary);
}

:root[data-theme="dark"] .contact-link {
  color: var(--brand-color);
}
/* Progress Bar Styles */
#progress-container {
  position: fixed;
  bottom: 6rem;
  left: 50%;
  transform: translateX(-50%);
  width: 90%;
  max-width: 400px;
  background-color: var(--bg-card);
  border-radius: var(--border-radius-md);
  padding: 1rem;
  box-shadow: var(--shadow-md);
  z-index: 1000;
  text-align: center;
}
.progress-bar {
  width: 100%;
  height: 10px;
  background-color: var(--border-color);
  border-radius: 5px;
  overflow: hidden;
  margin-bottom: 0.5rem;
}
.progress-bar::before {
  content: "";
  display: block;
  height: 100%;
  width: var(--progress, 0%);
  background-color: var(--brand-color);
  transition: width 0.3s;
}
.progress-text {
  font-size: 0.875rem;
  color: var(--text-secondary);
}