/* Modern CSS Reset & Variable Definitions - SaaS Styleguide v2.1 */
:root {
  /* Color Tokens */
  --color-bg-primary: #F9F8F5;    /* Warm Off-White / Gray 50 */
  --color-bg-secondary: #F4F2EB;  /* Slightly darker warm tone */
  --color-surface: #FFFFFF;       /* Clean White */
  --color-border: #E2DFD7;        /* Soft warm gray border */
  --color-text-primary: #1C1C1C;  /* Gray 900 */
  --color-text-secondary: #3D3D3D;/* Gray 700 */
  --color-text-muted: #757575;    /* Gray 500 */
  --color-primary-action: #0F5A60;/* Deep Teal */
  --color-action-hover: #1B747C;
  --color-action-active: #0A3F44;
  --color-badge-bg: rgba(15, 90, 96, 0.08);
  --color-focus-ring: rgba(15, 90, 96, 0.25);

  /* Typography Scale */
  --font-primary: 'Inter', system-ui, -apple-system, sans-serif;
  
  /* Radius Scale */
  --radius-button: 8px;
  --radius-card: 16px;
  --radius-chip: 24px;
  
  /* Spacing Scale */
  --space-2xs: 4px;
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 32px;
  --space-xl: 48px;
  --space-2xl: 64px;

  /* Elevation (Shadows) */
  --shadow-1: 0 2px 4px -1px rgba(0, 0, 0, 0.06), 0 1px 2px -1px rgba(0, 0, 0, 0.04);
  --shadow-2: 0 4px 6px -2px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
  --shadow-3: 0 10px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 16px -6px rgba(0, 0, 0, 0.04);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  font-family: var(--font-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  line-height: 1.6;
}

/* Typography Global */
h1, h2, h3, h4 {
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
  line-height: 1.2;
}

p {
  color: var(--color-text-secondary);
}

a {
  color: inherit;
  text-decoration: none;
}

/* Top Announcement Bar */
.announce-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.625rem;
  background-color: var(--color-primary-action);
  color: var(--color-surface);
  padding: 0.625rem var(--space-md);
  font-size: 0.8125rem;
  font-weight: 500;
  text-align: center;
  transition: background-color var(--transition-fast);
}

.announce-bar:hover {
  background-color: var(--color-action-hover);
}

.announce-tag {
  background-color: rgba(255, 255, 255, 0.18);
  color: var(--color-surface);
  font-size: 0.6875rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
}

.announce-text {
  color: var(--color-surface);
}

.announce-arrow {
  font-weight: 700;
  transition: transform var(--transition-fast);
}

.announce-bar:hover .announce-arrow {
  transform: translateX(3px);
}

@media (max-width: 600px) {
  .announce-bar {
    font-size: 0.75rem;
    padding: 0.5rem var(--space-sm);
    gap: 0.5rem;
  }
  .announce-text {
    text-align: left;
  }
}

/* Footer free link */
.footer-free-link {
  display: inline-block;
  margin-top: 0.75rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary-action);
  transition: color var(--transition-fast);
}

.footer-free-link:hover {
  color: var(--color-action-hover);
  text-decoration: underline;
}

/* Header & Navigation Styling */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(249, 248, 245, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  padding: 1.25rem var(--space-md);
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--color-text-primary);
}

.logo-icon {
  flex-shrink: 0;
}

.nav-cta {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary-action);
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-button);
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-1);
}

.nav-cta:hover {
  background-color: var(--color-bg-primary);
  border-color: var(--color-primary-action);
  color: var(--color-primary-action);
  box-shadow: var(--shadow-2);
}

/* Hero Section */
.hero-section {
  padding: var(--space-2xl) var(--space-md) var(--space-xl);
  text-align: center;
  background-color: var(--color-bg-primary);
}

.hero-container {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.badge {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-primary-action);
  background-color: var(--color-badge-bg);
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-chip);
  margin-bottom: var(--space-md);
  border: 1px solid rgba(15, 90, 96, 0.15);
}

.hero-headline {
  font-size: 3.75rem;
  font-weight: 800;
  margin-bottom: var(--space-sm);
  color: var(--color-text-primary);
  line-height: 1.15;
}

.highlight-text {
  color: var(--color-primary-action);
}

.hero-subheadline {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  max-width: 650px;
  margin-bottom: var(--space-lg);
  font-weight: 400;
}

.hero-cta-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
}

.cta-button {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  background-color: var(--color-primary-action);
  color: var(--color-surface);
  font-size: 1.125rem;
  font-weight: 700;
  padding: 1.125rem 2.5rem;
  border-radius: var(--radius-button);
  box-shadow: var(--shadow-2);
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
}

.cta-button:hover {
  background-color: var(--color-action-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-3);
}

.cta-button:active {
  background-color: var(--color-action-active);
}

.arrow-icon {
  transition: transform var(--transition-fast);
}

.cta-button:hover .arrow-icon {
  transform: translateX(4px);
}

.cta-guarantee {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* Common Section Layout */
.section-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-xl) var(--space-md);
}

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: var(--space-xs);
  color: var(--color-text-primary);
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  text-align: center;
  margin-bottom: var(--space-xl);
}

/* Visual Feature Preview Section */
.preview-section {
  background-color: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.preview-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: var(--space-md);
  cursor: pointer;
  position: relative;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-1);
}

.preview-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-2);
  border-color: var(--color-primary-action);
}

.preview-card.active {
  border-color: var(--color-primary-action);
  box-shadow: var(--shadow-2), 0 0 0 2px var(--color-focus-ring);
}

.card-icon-header {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  margin-bottom: var(--space-xs);
}

.icon-box {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-button);
  background-color: var(--color-bg-primary);
  color: var(--color-text-secondary);
}

.preview-card.active .icon-box {
  background-color: var(--color-badge-bg);
  color: var(--color-primary-action);
}

.card-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text-primary);
}

.card-description {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

.card-badge {
  position: absolute;
  top: 1rem;
  right: 1rem;
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-text-muted);
  background-color: var(--color-bg-secondary);
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
}

.preview-card.active .card-badge {
  background-color: var(--color-badge-bg);
  color: var(--color-primary-action);
}

/* Visualization Display (Excel Mockup) */
.visualization-display {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--shadow-3);
}

.display-header {
  background-color: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border);
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.window-dots {
  display: flex;
  gap: 0.5rem;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.dot.red { background-color: #E26E67; }
.dot.yellow { background-color: #E4C056; }
.dot.green { background-color: #63C16C; }

.display-tab-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  font-family: monospace;
}

.display-content {
  padding: var(--space-md);
  min-height: 250px;
}

.pane {
  display: none;
}

.pane.active {
  display: block;
  animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Excel Sheet Table Grid style */
.excel-mockup {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-button);
  overflow: hidden;
  background-color: var(--color-surface);
}

.mockup-row {
  display: flex;
  border-bottom: 1px solid var(--color-border);
}

.mockup-row:last-child {
  border-bottom: none;
}

.mockup-row.header-row {
  background-color: var(--color-bg-secondary);
  font-weight: 700;
  color: var(--color-primary-action);
}

.cell {
  padding: 0.875rem 1.25rem;
  font-size: 0.875rem;
  flex: 1;
  display: flex;
  align-items: center;
  border-right: 1px solid var(--color-border);
}

.cell:last-child {
  border-right: none;
}

.cell.col-a { flex: 2; }
.cell.col-b { flex: 2.2; }
.cell.col-c { flex: 2.8; }
.cell.col-d { flex: 1.2; text-align: right; justify-content: flex-end; }

kbd {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 0.15rem 0.4rem;
  font-size: 0.75rem;
  font-family: monospace;
  color: var(--color-text-primary);
  margin: 0 0.1rem;
  box-shadow: 0 1px 0 rgba(0,0,0,0.1);
}

.formula-code {
  font-family: monospace;
  color: var(--color-primary-action);
  background-color: var(--color-badge-bg);
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  word-break: break-all;
  border: 1px solid rgba(15, 90, 96, 0.1);
}

.font-semibold { font-weight: 600; }
.text-white { color: var(--color-text-primary); }
.text-gray { color: var(--color-text-secondary); }
.text-green { color: var(--color-primary-action); font-weight: 600; }

/* Social Proof Banner styling */
.value-prop-banner {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-xl) var(--space-md);
  text-align: center;
}

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

.banner-quote {
  font-size: 1.75rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-text-primary);
  position: relative;
}

.banner-quote::before {
  content: '“';
  font-size: 5rem;
  color: var(--color-primary-action);
  position: absolute;
  top: -3.5rem;
  left: 50%;
  transform: translateX(-50%);
  opacity: 0.15;
}

/* Pricing & Checkout Card layout */
.pricing-section {
  background-color: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border);
}

.pricing-card {
  max-width: 600px;
  margin: 0 auto;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: var(--space-xl) var(--space-md);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-3);
  transition: border-color var(--transition-normal);
}

.pricing-card:hover {
  border-color: var(--color-primary-action);
}

.card-highlight-badge {
  position: absolute;
  top: 1.5rem;
  right: -3rem;
  background-color: var(--color-primary-action);
  color: var(--color-surface);
  font-size: 0.6875rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.35rem 3rem;
  transform: rotate(45deg);
}

.pricing-header {
  text-align: center;
  margin-bottom: var(--space-md);
}

.pricing-title {
  font-size: 1.75rem;
  font-weight: 800;
  margin-bottom: var(--space-xs);
  color: var(--color-text-primary);
}

.pricing-price-box {
  display: flex;
  justify-content: center;
  align-items: baseline;
  gap: 0.25rem;
}

.currency {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-primary-action);
}

.price {
  font-size: 4rem;
  font-weight: 800;
  line-height: 1;
  color: var(--color-text-primary);
}

.term {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.pricing-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
}

.pricing-features li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-xs);
  font-size: 1rem;
  color: var(--color-text-secondary);
}

.pricing-features li svg {
  flex-shrink: 0;
  margin-top: 0.2rem;
}

.checkout-button {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  background-color: var(--color-primary-action);
  color: var(--color-surface);
  width: 100%;
  font-size: 1.125rem;
  font-weight: 700;
  padding: 1.125rem var(--space-md);
  border-radius: var(--radius-button);
  box-shadow: var(--shadow-2);
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
  outline: none;
}

.checkout-button:hover {
  background-color: var(--color-action-hover);
  box-shadow: var(--shadow-3);
}

.checkout-button:active {
  background-color: var(--color-action-active);
}

.checkout-button svg {
  transition: transform var(--transition-fast);
}

.checkout-button:hover svg {
  transform: translateX(4px);
}

.checkout-footer {
  margin-top: var(--space-sm);
  display: flex;
  justify-content: center;
}

.ssl-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* FAQ Accordion Styling */
.faq-section {
  background-color: var(--color-bg-primary);
  border-bottom: 1px solid var(--color-border);
}

.max-w-3xl {
  max-width: 750px;
}

.faq-accordion {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.faq-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-button);
  overflow: hidden;
  transition: border-color var(--transition-fast);
  box-shadow: var(--shadow-1);
}

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

.faq-item.active {
  border-color: var(--color-primary-action);
  box-shadow: var(--shadow-2);
}

.faq-trigger {
  width: 100%;
  background: none;
  border: none;
  outline: none;
  padding: 1.25rem var(--space-sm);
  display: flex;
  justify-content: flex-start;
  align-items: center;
  gap: var(--space-xs);
  cursor: pointer;
  text-align: left;
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--color-text-primary);
  font-family: inherit;
  position: relative;
}

.faq-trigger span {
  flex-grow: 1;
}

.faq-chevron {
  flex-shrink: 0;
  color: var(--color-text-secondary);
  transition: transform var(--transition-normal);
}

.faq-item.active .faq-chevron {
  transform: rotate(180deg);
  color: var(--color-primary-action);
}

.faq-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal);
}

.faq-content p {
  padding: 0 var(--space-sm) 1.25rem;
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
}

/* Footer Section */
.site-footer {
  padding: var(--space-xl) var(--space-md);
  background-color: var(--color-bg-secondary);
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--space-sm);
}

.footer-logo {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-text-primary);
}

.footer-tagline {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-top: 0.5rem;
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  width: 100%;
  padding-top: var(--space-sm);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

/* Media Queries for Responsiveness */
@media (max-width: 992px) {
  .hero-headline {
    font-size: 3rem;
  }
  
  .preview-grid {
    grid-template-columns: 1fr;
    gap: var(--space-xs);
  }
}

@media (max-width: 768px) {
  .hero-section {
    padding: var(--space-xl) var(--space-xs) var(--space-lg);
  }
  
  .hero-headline {
    font-size: 2.25rem;
  }
  
  .hero-subheadline {
    font-size: 1.125rem;
    margin-bottom: var(--space-sm);
  }
  
  .section-container {
    padding: var(--space-lg) var(--space-xs);
  }
  
  .section-title {
    font-size: 1.75rem;
  }
  
  .excel-mockup {
    overflow-x: auto;
  }
  
  .mockup-row {
    min-width: 600px;
  }
  
  .pricing-card {
    padding: var(--space-lg) var(--space-sm);
  }
  
  .price {
    font-size: 3.25rem;
  }
  
  .faq-trigger {
    padding: 1rem 1.25rem;
    font-size: 1rem;
  }
  
  .faq-content p {
    padding: 0 1.25rem 1rem;
  }
  
  .footer-bottom {
    flex-direction: column;
    gap: var(--space-xs);
    align-items: center;
  }
}

/* Success Page Specific Styles */
.success-page-body {
  background-color: var(--color-bg-primary);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-md) var(--space-sm);
}

.success-wrapper {
  max-width: 550px;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
}

.success-header {
  margin-bottom: var(--space-xs);
}

.logo-muted {
  opacity: 0.85;
}

.success-container {
  width: 100%;
}

.success-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 3rem 2.5rem;
  text-align: center;
  box-shadow: var(--shadow-3);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.success-icon-box {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background-color: var(--color-badge-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
}

.success-title {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: var(--space-xs);
  line-height: 1.25;
}

.success-description {
  font-size: 1rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
  max-width: 420px;
  line-height: 1.5;
}

.download-btn {
  width: 100%;
  justify-content: center;
  margin-bottom: var(--space-md);
}

.success-help {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  line-height: 1.5;
  max-width: 380px;
}

.support-link {
  color: var(--color-primary-action);
  font-weight: 600;
  text-decoration: underline;
}

.support-link:hover {
  color: var(--color-action-hover);
}

.success-footer {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

@media (max-width: 576px) {
  .success-card {
    padding: 2rem 1.5rem;
  }
  .success-title {
    font-size: 1.75rem;
  }
}