/* ==========================================================================
   FinBillx Website Base & Typography Styles (Clean, Clear & Exact App Alignment)
   ========================================================================== */

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

html {
  scroll-behavior: smooth;
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--fb-font-family);
  font-size: var(--fb-font-size-base);
  font-weight: var(--fb-font-weight-normal);
  line-height: 1.5;
  color: var(--fb-text-primary);
  background-color: var(--fb-bg-page);
  overflow-x: hidden;
  position: relative;
  transition: background-color var(--fb-transition-normal), color var(--fb-transition-normal);
}

/* Container */
.container {
  width: 100%;
  max-width: var(--fb-container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--fb-space-6);
  padding-right: var(--fb-space-6);
  position: relative;
  z-index: 1;
}

@media (max-width: 640px) {
  .container {
    padding-left: var(--fb-space-4);
    padding-right: var(--fb-space-4);
  }
}

/* Sections */
.section {
  padding-top: var(--fb-space-20);
  padding-bottom: var(--fb-space-20);
  position: relative;
}

@media (max-width: 768px) {
  .section {
    padding-top: var(--fb-space-12);
    padding-bottom: var(--fb-space-12);
  }
}

/* Section Header */
.section-header {
  text-align: center;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: var(--fb-space-12);
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--fb-space-1);
  padding: 4px 12px;
  background: var(--fb-primary-light);
  color: var(--fb-primary);
  border-radius: var(--fb-radius-full);
  font-size: var(--fb-font-size-xs);
  font-weight: var(--fb-font-weight-semibold);
  margin-bottom: var(--fb-space-3);
  border: 1px solid rgba(37, 99, 235, 0.12);
}

.section-title {
  font-size: var(--fb-font-size-3xl);
  font-weight: var(--fb-font-weight-bold);
  color: var(--fb-text-primary);
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: var(--fb-space-3);
}

@media (max-width: 768px) {
  .section-title {
    font-size: var(--fb-font-size-2xl);
  }
}

.section-subtitle {
  font-size: var(--fb-font-size-md);
  color: var(--fb-text-muted);
  line-height: 1.6;
}

/* Typography & Links */
a {
  color: var(--fb-text-link);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* Clean Cards (Matching App .fb-card) */
.fb-card {
  background: var(--fb-bg-card);
  border: 1px solid var(--fb-border);
  border-radius: var(--fb-radius-lg);
  padding: var(--fb-space-6);
  transition: border-color var(--fb-transition-fast), box-shadow var(--fb-transition-fast);
}

.fb-card:hover {
  border-color: var(--fb-border-strong);
}

/* Exact FinBillx Buttons (src/styles.scss) */
.fb-btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--fb-space-2);
  height: 38px;
  padding: 0 var(--fb-space-5);
  background: var(--fb-primary);
  color: var(--fb-primary-fg);
  border: none;
  border-radius: var(--fb-radius-md);
  font-family: inherit;
  font-size: var(--fb-font-size-base);
  font-weight: var(--fb-font-weight-semibold);
  transition: background var(--fb-transition-fast), transform var(--fb-transition-fast), box-shadow var(--fb-transition-fast);
  white-space: nowrap;
  cursor: pointer;
  text-decoration: none;
}

.fb-btn-primary:hover {
  background: var(--fb-primary-hover);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.18);
  transform: translateY(-1px);
  text-decoration: none;
}

.fb-btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--fb-space-2);
  height: 38px;
  padding: 0 var(--fb-space-4);
  background: var(--fb-bg-card);
  color: var(--fb-text-secondary);
  border: 1px solid var(--fb-border);
  border-radius: var(--fb-radius-md);
  font-family: inherit;
  font-size: var(--fb-font-size-base);
  font-weight: var(--fb-font-weight-medium);
  cursor: pointer;
  transition: background var(--fb-transition-fast), border-color var(--fb-transition-fast), color var(--fb-transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

.fb-btn-ghost:hover {
  background: var(--fb-bg-hover);
  border-color: var(--fb-border-strong);
  color: var(--fb-text-primary);
  text-decoration: none;
}

.fb-btn-lg {
  height: 46px;
  padding: 0 var(--fb-space-6);
  font-size: var(--fb-font-size-md);
}

.fb-btn-sm {
  height: 32px;
  padding: 0 var(--fb-space-3);
  font-size: var(--fb-font-size-sm);
  border-radius: var(--fb-radius-sm);
}

/* Exact App Status Badges (.fb-badge) */
.fb-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: var(--fb-radius-full);
  font-size: var(--fb-font-size-xs);
  font-weight: var(--fb-font-weight-medium);
  letter-spacing: 0.01em;
  line-height: 1.3;
}

.fb-badge--dot::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: var(--fb-radius-full);
  background: currentColor;
  flex-shrink: 0;
}

.fb-badge--paid {
  background: var(--fb-success-bg);
  color: var(--fb-success-fg);
}

.fb-badge--pending {
  background: var(--fb-warning-bg);
  color: var(--fb-warning-fg);
}

.fb-badge--draft {
  background: var(--fb-neutral-bg);
  color: var(--fb-neutral-fg);
}

.fb-badge--sent {
  background: var(--fb-accent-purple-bg);
  color: var(--fb-accent-purple-fg);
}

.fb-badge--active {
  background: var(--fb-success-bg);
  color: var(--fb-success-fg);
}

/* Premium AI Badge & Tag Helpers */
.fb-ai-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 10px;
  background: var(--fb-accent-purple-bg);
  color: var(--fb-accent-purple-fg);
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: var(--fb-radius-full);
  font-size: 11px;
  font-weight: var(--fb-font-weight-semibold);
  letter-spacing: 0.02em;
  box-shadow: 0 1px 2px rgba(99, 102, 241, 0.08);
}

.fb-ai-badge svg {
  color: var(--fb-accent-purple);
}

.fb-ai-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  background: var(--fb-accent-purple-bg);
  color: var(--fb-accent-purple-fg);
  border: 1px solid rgba(99, 102, 241, 0.25);
  border-radius: var(--fb-radius-full);
  font-size: var(--fb-font-size-xs);
  font-weight: var(--fb-font-weight-semibold);
}

.fb-ai-text {
  font-weight: var(--fb-font-weight-bold);
  color: var(--fb-accent-purple);
}

/* Move to Top Floating Action Button */
.scroll-to-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 42px;
  height: 42px;
  border-radius: var(--fb-radius-full);
  background: var(--fb-primary);
  color: var(--fb-primary-fg);
  border: 1px solid var(--fb-border);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.18);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px);
  transition: all var(--fb-transition-normal);
  z-index: 990;
}

.scroll-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.scroll-to-top:hover {
  background: var(--fb-primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
}

.scroll-to-top:active {
  transform: translateY(0);
}

[data-theme='dark'] .scroll-to-top {
  background: var(--fb-bg-card);
  color: var(--fb-primary);
  border-color: var(--fb-border-strong);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
}

[data-theme='dark'] .scroll-to-top:hover {
  background: var(--fb-bg-hover);
  border-color: var(--fb-primary);
}

/* ==========================================================================
   FinBillx Micro-Animations & Scroll Reveal System
   ========================================================================== */

/* Scroll Reveal */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1), transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* Status Pulsing */
.status-dot, .ai-status-pulse {
  animation: fb-status-pulse 2s infinite cubic-bezier(0.4, 0, 0.6, 1);
}

@keyframes fb-status-pulse {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.5;
    transform: scale(1.15);
  }
}

/* Card Hover Elevation */
.feature-card, .pricing-card, .testimonial-card {
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.25s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.2s ease;
}

.feature-card:hover, .testimonial-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--fb-shadow-dropdown);
  border-color: var(--fb-border-strong);
}

/* AI Sparkle Breathing Glow */
.fb-ai-badge svg, .spotlight-pill svg {
  animation: fb-sparkle-glow 3s ease-in-out infinite alternate;
}

@keyframes fb-sparkle-glow {
  0% { transform: scale(1) rotate(0deg); opacity: 0.85; }
  50% { transform: scale(1.15) rotate(4deg); opacity: 1; }
  100% { transform: scale(1) rotate(0deg); opacity: 0.85; }
}

@media (max-width: 640px) {
  .scroll-to-top {
    bottom: 20px;
    right: 20px;
    width: 38px;
    height: 38px;
  }
}

/* Accessibility: Skip to Main Content Link */
.skip-to-content {
  position: fixed;
  top: -100px;
  left: 20px;
  background: var(--fb-primary);
  color: #ffffff !important;
  padding: 10px 18px;
  border-radius: var(--fb-radius-md);
  font-weight: 600;
  font-size: 14px;
  z-index: 10000;
  text-decoration: none;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
  transition: top 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.skip-to-content:focus {
  top: 16px;
  outline: 2px solid #ffffff;
  outline-offset: 2px;
}