:root {
  --bg-page: #F8FAFC;
  --bg-hero-start: #F0FDFA;
  --bg-hero-end: #F1F5F9;
  --bg-card: #FFFFFF;
  --primary-accent: #0D9488;
  --primary-accent-light: #CCFBF1;
  --text-dark: #1E293B;
  --text-medium: #475569;
  --text-light: #94A3B8;
  --border-color: #E2E8F0;
  --error-bg: #FEF2F2;
  --error-text: #DC2626;
  --warning-bg: #FFFBEB;
  --warning-text: #B45309;
  --success-bg: #ECFDF5;
  --success-text: #065F46;
  --results-bg: #F8FAFC;
  --positive-color: #065F46;
  --negative-color: #DC2626;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg-page);
  color: var(--text-medium);
  line-height: 1.6;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  color: var(--text-dark);
  line-height: 1.2;
  font-weight: 600;
}

h1 {
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  font-weight: 800;
  margin-bottom: 1rem;
}

h2.section-title {
  font-size: clamp(1.25rem, 4vw, 1.5rem);
  margin-bottom: 1.25rem;
}

/* Navigation */
.navbar {
  background-color: var(--bg-card);
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
  position: sticky;
  top: 0;
  z-index: 1000;
  width: 100%;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem clamp(0.75rem, 3vw, 1rem);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-logo {
  height: 32px;
  width: auto;
}

.brand-name {
  font-weight: 700;
  color: var(--text-dark);
  font-size: 1.1rem;
}

.brand-link {
  text-decoration: none;
  color: inherit;
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand-link:hover {
  text-decoration: none;
  color: inherit;
}

/* Navigation Toggle */
.nav-toggle {
  display: flex;
  flex-direction: column;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  gap: 0.25rem;
  z-index: 1002;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background-color: var(--text-dark);
  transition: all 0.3s ease;
  transform-origin: center;
}

/* Navigation Slider */
.nav-slider {
  position: fixed;
  top: 0;
  right: -100%;
  width: 300px;
  height: 100vh;
  background-color: var(--bg-card);
  box-shadow: -4px 0 20px rgba(0, 0, 0, 0.1);
  transition: right 0.3s ease-in-out;
  z-index: 1001;
  overflow-y: auto;
}

.nav-slider.active {
  right: 0;
}

.slider-content {
  padding: 1.5rem;
  height: 100%;
}

.slider-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.slider-close {
  background: none;
  border: none;
  font-size: 1.25rem;
  color: var(--text-dark);
  cursor: pointer;
  padding: 0.5rem;
  z-index: 1002;
}

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

.slider-link {
  display: block;
  padding: 1rem;
  color: var(--text-dark);
  text-decoration: none;
  font-weight: 500;
  border-radius: 0.5rem;
  transition: all 0.2s;
}

.slider-link:hover, .slider-link.active {
  background-color: var(--primary-accent-light);
  color: var(--primary-accent);
}

/* Overlay when slider is open */
.nav-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.nav-overlay.active {
  opacity: 1;
  visibility: visible;
}

/* Hero Section */
.hero-section {
  background: linear-gradient(135deg, var(--bg-hero-start) 0%, var(--bg-hero-end) 100%);
  padding: clamp(3rem, 8vw, 5rem) clamp(1rem, 4vw, 2rem);
  text-align: center;
  position: relative;
  overflow: hidden;
  margin-bottom: 2rem;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
}

.hero-text p {
  font-size: clamp(1rem, 3vw, 1.25rem);
  margin-bottom: 2.5rem;
  color: var(--text-medium);
  line-height: 1.7;
}

.feature-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 15px 0;
  justify-content: center;
}

.feature-badge {
  background-color: var(--primary-accent-light);
  color: var(--primary-accent);
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Cards */
.card {
  background-color: var(--bg-card);
  border-radius: 1rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  padding: clamp(1.5rem, 4vw, 2rem);
  margin-bottom: 1.5rem;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.main-card {
  margin-top: 0;
  position: relative;
  z-index: 10;
}

/* Converter Container */
.converter-container {
  padding: 0 clamp(1rem, 4vw, 2rem);
  margin-bottom: 3rem;
}

/* Centered Form Container */
.centered-form-container {
  max-width: 800px;
  margin: 0 auto;
  width: 100%;
}

/* Main Tabs */
.main-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2rem;
  justify-content: center;
}

.main-tab {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 1.5rem;
  border: 2px solid var(--primary-accent);
  border-radius: 0.75rem;
  background-color: white;
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: 0.9rem;
  font-weight: 600;
  text-align: center;
  color: var(--primary-accent);
  box-shadow: 0 2px 8px rgba(13, 148, 136, 0.1);
  min-width: 140px;
  justify-content: center;
}

.main-tab:hover {
  background-color: var(--primary-accent-light);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(13, 148, 136, 0.15);
}

.main-tab.active {
  background-color: var(--primary-accent);
  border-color: var(--primary-accent);
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(13, 148, 136, 0.2);
}

.main-tab i {
  font-size: 1.1rem;
}

/* Tab Content */
.tab-content {
  display: none;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.tab-content.active {
  display: flex;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* Form Elements */
.form-section {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  position: relative;
}

.input-group label {
  font-weight: 500;
  color: var(--text-dark);
}

.input-group input, .input-group select {
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  font-size: 1rem;
  transition: all 0.2s;
  background-color: white;
}

.input-group input:focus, .input-group select:focus {
  outline: none;
  border-color: var(--primary-accent);
  box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.1);
}

.input-suffix {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-light);
  font-weight: 500;
}

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

.input-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

/* Buttons */
.calculate-button {
  background-color: var(--primary-accent);
  color: white;
  border: none;
  padding: 1rem 1.5rem;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.2s;
  text-align: center;
  width: 100%;
  margin-top: 0.5rem;
}

.calculate-button:hover {
  background-color: #0f766e;
  transform: translateY(-2px);
}

.calculate-button:disabled {
  background-color: var(--text-light);
  cursor: not-allowed;
  transform: none;
}

.cta-button {
  display: inline-block;
  background-color: var(--primary-accent);
  color: white;
  padding: 1rem 2rem;
  border-radius: 0.5rem;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.2s;
  border: none;
  cursor: pointer;
  margin-top: 1rem;
}

.cta-button:hover {
  background-color: #0f766e;
  transform: translateY(-2px);
}

.action-button {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  background-color: white;
  color: var(--text-dark);
  cursor: pointer;
  transition: all 0.2s;
  font-size: 0.875rem;
  text-align: center;
}

.action-button:hover {
  border-color: var(--primary-accent);
  color: var(--primary-accent);
}

.action-button.secondary {
  background-color: var(--bg-page);
}

.action-buttons {
  display: flex;
  gap: 1rem;
  margin-top: 1.5rem;
}

/* Upload Area */
.upload-area {
  border: 2px dashed var(--primary-accent);
  border-radius: 1rem;
  padding: 3rem 2rem;
  text-align: center;
  background-color: var(--primary-accent-light);
  transition: all 0.3s ease;
  cursor: pointer;
}

.upload-area:hover {
  background-color: #b2f5ea;
  border-color: #0d9488;
}

.upload-area.drag-over {
  background-color: #b2f5ea;
  border-color: #0d9488;
  transform: scale(1.02);
}

.upload-icon {
  font-size: 3rem;
  color: var(--primary-accent);
  margin-bottom: 1rem;
}

.upload-btn {
  background-color: var(--primary-accent);
  color: white;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  margin: 1rem 0;
}

.upload-btn:hover {
  background-color: #0f766e;
}

.upload-info {
  font-size: 0.875rem;
  color: var(--text-light);
  margin-top: 1rem;
}

/* File Info */
.file-info {
  margin-top: 2rem;
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  overflow: hidden;
  background: white;
}

.file-info h4 {
  padding: 1rem;
  background: var(--bg-page);
  border-bottom: 1px solid var(--border-color);
  margin: 0;
}

#file-status {
  color: var(--text-light);
  font-weight: normal;
}

.info-container {
  padding: 1rem;
}

.info-item {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.info-label {
  font-weight: 500;
  color: var(--text-dark);
}

.info-value {
  color: var(--primary-accent);
  font-weight: 600;
}

/* Sheet Selector */
.sheet-selector {
  margin: 1.5rem 0;
}

.sheet-selector label {
  display: block;
  font-weight: 500;
  color: var(--text-dark);
  margin-bottom: 0.5rem;
}

.sheet-selector select {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  font-size: 1rem;
  background-color: white;
}

/* Data Preview */
.data-preview {
  margin-top: 2rem;
}

.data-preview h4 {
  margin-bottom: 1rem;
}

#preview-info {
  color: var(--text-light);
  font-weight: normal;
}

.table-container {
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  overflow: hidden;
  background: white;
  max-height: 400px;
  overflow-y: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
}

.data-table th,
.data-table td {
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  text-align: left;
}

.data-table th {
  background-color: var(--primary-accent-light);
  color: var(--primary-accent);
  font-weight: 600;
  position: sticky;
  top: 0;
}

.data-table tr:nth-child(even) {
  background-color: var(--bg-page);
}

.empty-state {
  text-align: center;
  color: var(--text-light);
  padding: 3rem;
}

.empty-state i {
  font-size: 3rem;
  margin-bottom: 1rem;
  color: var(--border-color);
}

/* Settings Grid */
.settings-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin: 1.5rem 0;
}

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

.setting-group label {
  font-weight: 500;
  color: var(--text-dark);
}

.setting-group select {
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  font-size: 1rem;
  background-color: white;
}

/* Checkbox Groups */
.checkbox-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1rem;
}

.checkbox-group input[type="checkbox"] {
  width: 18px;
  height: 18px;
}

/* Advanced Settings */
.advanced-settings {
  margin-top: 2rem;
  padding: 1.5rem;
  background: var(--bg-page);
  border-radius: 0.75rem;
  border-left: 4px solid var(--primary-accent);
}

.advanced-settings h4 {
  margin-bottom: 1rem;
  color: var(--text-dark);
}

/* Conversion Summary */
.conversion-summary {
  margin: 2rem 0;
}

.summary-card {
  background: var(--bg-page);
  border-radius: 0.75rem;
  padding: 1.5rem;
  border-left: 4px solid var(--primary-accent);
}

.summary-card h4 {
  margin-bottom: 1rem;
  color: var(--text-dark);
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.summary-item {
  display: flex;
  justify-content: space-between;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border-color);
}

.summary-label {
  font-weight: 500;
  color: var(--text-dark);
}

.summary-value {
  color: var(--primary-accent);
  font-weight: 600;
}

/* Download Info Card */
.download-info-card {
  margin-top: 2rem;
  padding: 1.5rem;
  background: var(--bg-page);
  border-radius: 0.75rem;
  border-left: 4px solid var(--primary-accent);
}

.download-info-card p {
  margin-bottom: 0.75rem;
  font-weight: 600;
  color: var(--text-dark);
}

.download-info-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.download-info-card li {
  padding: 0.25rem 0;
  color: var(--text-medium);
  position: relative;
  padding-left: 1.5rem;
}

.download-info-card li:before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--primary-accent);
  font-weight: bold;
}

/* Feature Cards */
.calculator-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin: 30px 0;
}

.feature-card {
  background: #f8f9fa;
  border-radius: 8px;
  padding: 20px;
  border-left: 4px solid var(--primary-accent);
}

.feature-card h4 {
  margin-top: 0;
  color: #2c3e50;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.feature-card i {
  color: var(--primary-accent);
}

/* Notices */
.privacy-notice, .disclaimer-box {
  padding: 1rem;
  border-radius: 0.5rem;
  margin-top: 1rem;
}

.privacy-notice {
  background-color: var(--success-bg);
  border-left: 4px solid var(--success-text);
}

.disclaimer-box {
  background-color: var(--warning-bg);
  border-left: 4px solid var(--warning-text);
}

.privacy-title, .disclaimer-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
  color: var(--text-dark);
}

.privacy-text, .disclaimer-text {
  font-size: 0.875rem;
  color: var(--text-medium);
}

/* Animations */
.animate-on-load {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.6s ease forwards;
}

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Message Container */
.message-container {
  position: fixed;
  top: 80px;
  right: 20px;
  z-index: 10000;
  max-width: 400px;
  width: 100%;
}

.message-box {
  padding: 1rem;
  border-radius: 0.5rem;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  animation: slideInRight 0.3s ease;
  border-left: 4px solid;
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(100%);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.message-box i {
  font-size: 1.25rem;
  margin-top: 0.125rem;
}

.message-content {
  flex: 1;
}

.message-content strong {
  display: block;
  margin-bottom: 0.25rem;
  font-weight: 600;
}

.error-box {
  background-color: var(--error-bg);
  color: var(--error-text);
  border-left-color: var(--error-text);
}

.success-box {
  background-color: var(--success-bg);
  color: var(--success-text);
  border-left-color: var(--success-text);
}

.warning-box {
  background-color: var(--warning-bg);
  color: var(--warning-text);
  border-left-color: var(--warning-text);
}

.info-box {
  background-color: var(--primary-accent-light);
  color: var(--primary-accent);
  border-left-color: var(--primary-accent);
}

/* How-To Section */
.how-to-section {
  padding: 4rem 1rem;
  background: linear-gradient(135deg, var(--bg-hero-start) 0%, var(--bg-hero-end) 100%);
}

.how-to-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-top: 2rem;
}

@media (min-width: 768px) {
  .how-to-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .how-to-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.how-to-card {
  background: var(--bg-card);
  border-radius: 1rem;
  padding: 2rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  transition: all 0.3s ease;
  border: 1px solid var(--border-color);
}

.how-to-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.how-to-icon {
  width: 60px;
  height: 60px;
  background: var(--primary-accent-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
}

.how-to-icon i {
  font-size: 1.5rem;
  color: var(--primary-accent);
}

.how-to-card h3 {
  color: var(--text-dark);
  font-size: 1.2rem;
  margin-bottom: 1rem;
  font-weight: 600;
  line-height: 1.4;
}

.how-to-card p {
  color: var(--text-medium);
  line-height: 1.6;
  font-size: 0.95rem;
}

.section-subtitle {
  text-align: center;
  color: var(--text-medium);
  margin-bottom: 2rem;
  font-size: 1.1rem;
}

/* Pro Tip and Quick Tip Styles */
.pro-tip, .quick-tip {
  background: var(--primary-accent-light);
  border-left: 4px solid var(--primary-accent);
  padding: 1rem;
  margin-top: 1rem;
  border-radius: 0 0.5rem 0.5rem 0;
}

.pro-tip strong, .quick-tip strong {
  color: var(--primary-accent);
}

/* FAQ Section */
.content-section {
  padding: 3rem 1rem;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

.faq-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-top: 2rem;
}

@media (min-width: 768px) {
  .faq-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.faq-card {
  background: var(--bg-card);
  border-radius: 1rem;
  padding: 2.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.faq-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
  border-color: var(--primary-accent-light);
}

.faq-icon {
  width: 60px;
  height: 60px;
  background: var(--primary-accent-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
}

.faq-icon i {
  font-size: 1.5rem;
  color: var(--primary-accent);
}

.faq-card h3 {
  color: var(--text-dark);
  font-size: 1.35rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  line-height: 1.4;
}

.faq-card p {
  color: var(--text-medium);
  line-height: 1.7;
  font-size: 1.05rem;
  margin-bottom: 1.5rem;
}

.faq-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
  margin-top: 1rem;
}

.faq-category {
  background: var(--primary-accent-light);
  color: var(--primary-accent);
  padding: 0.5rem 1rem;
  border-radius: 2rem;
  font-size: 0.875rem;
  font-weight: 600;
}

.faq-read-time {
  color: var(--text-light);
  font-size: 0.875rem;
  font-weight: 500;
}

/* Simple FAQ Grid */
.simple-faq-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-top: 2rem;
}

@media (min-width: 768px) {
  .simple-faq-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .simple-faq-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.simple-faq-item {
  background: var(--bg-card);
  border-radius: 1rem;
  padding: 2rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
}

.simple-faq-item:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
  border-color: var(--primary-accent-light);
}

.simple-faq-item h3 {
  color: var(--text-dark);
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 1rem;
  line-height: 1.4;
}

.simple-faq-item p {
  color: var(--text-medium);
  line-height: 1.6;
  font-size: 1rem;
  margin: 0;
}

/* Footer */
.footer {
  background-color: var(--bg-card);
  padding: 2rem 1rem;
  margin-top: 4rem;
  text-align: center;
  border-top: 1px solid var(--border-color);
}

.footer-content {
  max-width: 800px;
  margin: 0 auto;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin: 1rem 0;
}

.footer-links a {
  color: var(--text-medium);
  text-decoration: none;
  transition: color 0.2s;
}

.footer-links a:hover {
  color: var(--primary-accent);
}

.disclaimer {
  font-size: 0.875rem;
  color: var(--text-light);
  margin-top: 1rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* Responsive Adjustments */
@media (max-width: 767px) {
  .input-row {
    grid-template-columns: 1fr;
  }
  
  .main-tabs {
    flex-direction: column;
    align-items: center;
  }
  
  .main-tab {
    min-width: auto;
    width: 100%;
    max-width: 280px;
  }
  
  .action-buttons {
    flex-direction: column;
  }
  
  .settings-grid {
    grid-template-columns: 1fr;
  }
  
  .summary-grid {
    grid-template-columns: 1fr;
  }
  
  .hero-section {
    padding: clamp(2rem, 6vw, 3rem) clamp(1rem, 4vw, 1.5rem);
    margin-bottom: 1.5rem;
  }
  
  .feature-badges {
    justify-content: flex-start;
  }
  
  .feature-badge {
    font-size: 0.8rem;
    padding: 6px 12px;
  }
}

@media (max-width: 480px) {
  .main-tab {
    padding: 0.75rem 1rem;
    font-size: 0.8rem;
  }
  
  .main-tab i {
    font-size: 1rem;
  }
  
  .how-to-card {
    padding: 1.5rem;
  }
  
  .upload-area {
    padding: 2rem 1rem;
  }
  
  .hero-text p {
    margin-bottom: 2rem;
  }
  
  .faq-card {
    padding: 1.5rem;
  }
  
  .faq-icon {
    width: 45px;
    height: 45px;
    margin-bottom: 1rem;
  }
  
  .faq-icon i {
    font-size: 1.1rem;
  }
  
  .faq-card h3 {
    font-size: 1.15rem;
    margin-bottom: 1rem;
  }
  
  .faq-card p {
    font-size: 1rem;
    line-height: 1.6;
  }
  
  .simple-faq-item {
    padding: 1.25rem;
  }
  
  .section-title {
    font-size: 1.75rem;
  }
  
  .section-subtitle {
    font-size: 1.1rem;
  }
}

/* Loading States */
.loading {
  position: relative;
  pointer-events: none;
}

.loading:after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  margin: -10px 0 0 -10px;
  border: 2px solid #ffffff;
  border-top: 2px solid transparent;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* Progress Bar */
.progress-bar {
  width: 100%;
  height: 4px;
  background: var(--border-color);
  border-radius: 2px;
  overflow: hidden;
  margin-top: 0.5rem;
}

.progress-fill {
  height: 100%;
  background: var(--primary-accent);
  transition: width 0.3s ease;
  width: 0%;
}

/* Responsive Messages */
@media (max-width: 768px) {
  .message-container {
    top: 70px;
    right: 10px;
    left: 10px;
    max-width: none;
  }
  
  .message-box {
    padding: 0.75rem;
  }
}

/* Data Table Responsive */
@media (max-width: 768px) {
  .table-container {
    font-size: 0.875rem;
  }
  
  .data-table th,
  .data-table td {
    padding: 0.5rem;
  }
}
/* Enhanced Content Sections */
.content-section {
  padding: 3rem 1rem;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

.section-title {
  font-size: clamp(1.5rem, 4vw, 2rem);
  text-align: center;
  margin-bottom: 1rem;
  color: var(--text-dark);
  font-weight: 700;
}

.section-subtitle {
  text-align: center;
  color: var(--text-medium);
  margin-bottom: 2rem;
  font-size: 1.1rem;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

/* Industry Grid */
.industry-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-top: 2rem;
}

@media (min-width: 768px) {
  .industry-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.industry-card {
  background: var(--bg-card);
  border-radius: 1rem;
  padding: 2rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
}

.industry-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.industry-icon {
  width: 60px;
  height: 60px;
  background: var(--primary-accent-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
}

.industry-icon i {
  font-size: 1.5rem;
  color: var(--primary-accent);
}

.industry-card h3 {
  color: var(--text-dark);
  font-size: 1.3rem;
  margin-bottom: 1rem;
  font-weight: 600;
}

.industry-card p {
  color: var(--text-medium);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.industry-benefits {
  background: var(--bg-page);
  padding: 1.5rem;
  border-radius: 0.5rem;
  border-left: 4px solid var(--primary-accent);
}

.industry-benefits h4 {
  color: var(--text-dark);
  margin-bottom: 1rem;
  font-size: 1.1rem;
}

.industry-benefits ul {
  list-style: none;
  padding: 0;
}

.industry-benefits li {
  padding: 0.5rem 0;
  color: var(--text-medium);
  position: relative;
  padding-left: 1.5rem;
}

.industry-benefits li:before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--primary-accent);
  font-weight: bold;
}

/* Technical Grid */
.technical-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-top: 2rem;
}

.technical-card {
  background: var(--bg-card);
  border-radius: 1rem;
  padding: 2rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid var(--border-color);
}

.technical-card h3 {
  color: var(--text-dark);
  font-size: 1.3rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.technical-card h3 i {
  color: var(--primary-accent);
}

.technical-card p {
  color: var(--text-medium);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.technical-details {
  background: var(--bg-page);
  padding: 1.5rem;
  border-radius: 0.5rem;
}

.technical-details h4 {
  color: var(--text-dark);
  margin-bottom: 1rem;
}

.technical-details ol, .technical-details ul {
  color: var(--text-medium);
  padding-left: 1.5rem;
}

.technical-details li {
  margin-bottom: 0.5rem;
  line-height: 1.5;
}

/* Comparison Table */
.comparison-table {
  margin: 3rem 0;
  overflow-x: auto;
}

.comparison-table table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-card);
  border-radius: 0.5rem;
  overflow: hidden;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.comparison-table th {
  background: var(--primary-accent);
  color: white;
  padding: 1rem;
  text-align: left;
  font-weight: 600;
}

.comparison-table td {
  padding: 1rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-medium);
}

.comparison-table tr:last-child td {
  border-bottom: none;
}

.comparison-table .fa-check-circle {
  color: var(--success-text);
}

.comparison-table .fa-times-circle {
  color: var(--error-text);
}

/* Advantage Cards */
.advantage-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-top: 2rem;
}

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

.advantage-card {
  background: var(--bg-card);
  padding: 1.5rem;
  border-radius: 0.5rem;
  border-left: 4px solid var(--primary-accent);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.advantage-card h4 {
  color: var(--text-dark);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.advantage-card h4 i {
  color: var(--primary-accent);
}

.advantage-card p {
  color: var(--text-medium);
  line-height: 1.6;
}

/* Troubleshooting Grid */
.troubleshooting-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-top: 2rem;
}

@media (min-width: 768px) {
  .troubleshooting-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.troubleshooting-card {
  background: var(--bg-card);
  border-radius: 1rem;
  padding: 2rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid var(--border-color);
}

.troubleshooting-card h3 {
  color: var(--text-dark);
  font-size: 1.2rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.troubleshooting-card h3 i {
  color: var(--primary-accent);
}

.troubleshooting-card p {
  color: var(--text-medium);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.solution-steps {
  background: var(--bg-page);
  padding: 1.5rem;
  border-radius: 0.5rem;
}

.solution-steps h4 {
  color: var(--text-dark);
  margin-bottom: 1rem;
}

.solution-steps ol, .solution-steps ul {
  color: var(--text-medium);
  padding-left: 1.5rem;
}

.solution-steps li {
  margin-bottom: 0.5rem;
  line-height: 1.5;
}

/* Enhanced FAQ Grid */
.faq-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-top: 2rem;
}

@media (min-width: 768px) {
  .faq-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.faq-card {
  background: var(--bg-card);
  border-radius: 1rem;
  padding: 2.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.faq-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
  border-color: var(--primary-accent-light);
}

.faq-icon {
  width: 60px;
  height: 60px;
  background: var(--primary-accent-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
}

.faq-icon i {
  font-size: 1.5rem;
  color: var(--primary-accent);
}

.faq-card h3 {
  color: var(--text-dark);
  font-size: 1.35rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  line-height: 1.4;
}

.faq-card p {
  color: var(--text-medium);
  line-height: 1.7;
  font-size: 1.05rem;
  margin-bottom: 1.5rem;
}

.faq-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
  margin-top: 1rem;
}

.faq-category {
  background: var(--primary-accent-light);
  color: var(--primary-accent);
  padding: 0.5rem 1rem;
  border-radius: 2rem;
  font-size: 0.875rem;
  font-weight: 600;
}

.faq-read-time {
  color: var(--text-light);
  font-size: 0.875rem;
  font-weight: 500;
}

/* Simple FAQ Grid */
.simple-faq-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-top: 2rem;
}

@media (min-width: 768px) {
  .simple-faq-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .simple-faq-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.simple-faq-item {
  background: var(--bg-card);
  border-radius: 1rem;
  padding: 2rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
}

.simple-faq-item:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
  border-color: var(--primary-accent-light);
}

.simple-faq-item h3 {
  color: var(--text-dark);
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 1rem;
  line-height: 1.4;
}

.simple-faq-item p {
  color: var(--text-medium);
  line-height: 1.6;
  font-size: 1rem;
  margin: 0;
}

/* Feature Cards Enhancement */
.calculator-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.feature-card {
  background: var(--bg-card);
  border-radius: 1rem;
  padding: 1.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border-left: 4px solid var(--primary-accent);
  transition: all 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.feature-card h4 {
  color: var(--text-dark);
  font-size: 1.1rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
}

.feature-card i {
  color: var(--primary-accent);
  width: 20px;
}

.feature-card p {
  color: var(--text-medium);
  line-height: 1.6;
  font-size: 0.95rem;
  margin: 0;
}

/* Responsive Adjustments for New Content */
@media (max-width: 768px) {
  .content-section {
    padding: 2rem 1rem;
  }
  
  .industry-card,
  .technical-card,
  .troubleshooting-card {
    padding: 1.5rem;
  }
  
  .faq-card {
    padding: 1.5rem;
  }
  
  .simple-faq-item {
    padding: 1.5rem;
  }
  
  .feature-card {
    padding: 1.25rem;
  }
  
  .comparison-table {
    font-size: 0.875rem;
  }
}

@media (max-width: 480px) {
  .industry-icon,
  .faq-icon {
    width: 45px;
    height: 45px;
    margin-bottom: 1rem;
  }
  
  .industry-icon i,
  .faq-icon i {
    font-size: 1.1rem;
  }
  
  .industry-card h3,
  .technical-card h3,
  .troubleshooting-card h3 {
    font-size: 1.1rem;
  }
  
  .faq-card h3 {
    font-size: 1.15rem;
  }
  
  .simple-faq-item h3 {
    font-size: 1.1rem;
  }
}