/* ============================================================
   SpendGuard — Marketing Website Stylesheet
   Design: Light theme, white/blue, APILayer-inspired
   ============================================================ */

/* --- CSS Variables --- */
:root {
  --bg-primary: #FFFFFF;
  --bg-secondary: #F8FAFC;
  --bg-elevated: #F1F5F9;
  --bg-dark: #0F172A;

  --text-primary: #1E293B;
  --text-secondary: #64748B;
  --text-tertiary: #94A3B8;
  --text-on-dark: #F8FAFC;
  --text-on-dark-muted: #94A3B8;

  --accent: #2563EB;
  --accent-hover: #1D4ED8;
  --accent-light: #DBEAFE;
  --accent-subtle: #EFF6FF;

  --allow: #16A34A;
  --allow-bg: #F0FDF4;
  --block: #DC2626;
  --block-bg: #FEF2F2;
  --escalate: #D97706;
  --escalate-bg: #FFFBEB;

  --border: #E2E8F0;
  --border-hover: #CBD5E1;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);

  --max-width: 1200px;
  --max-width-narrow: 800px;
  --nav-height: 64px;
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: var(--nav-height); }
body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); }
img, svg { display: block; max-width: 100%; }
ul { list-style: none; }

/* --- Container --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: inherit;
  font-weight: 600;
  font-size: 0.875rem;
  padding: 12px 24px;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  transition: all 0.15s ease;
  gap: 8px;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: var(--accent-hover); box-shadow: var(--shadow-md); color: #fff; }

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
}
.btn-secondary:hover { background: var(--bg-secondary); border-color: var(--border-hover); }

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 1000;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}
.nav.scrolled { border-bottom-color: var(--border); }
.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo { height: 28px; width: auto; }
.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.15s ease;
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.25s ease;
}
.nav-links a:hover { color: var(--text-primary); }
.nav-links a:hover::after { width: 100%; }
.nav-ctas {
  display: flex;
  align-items: center;
  gap: 12px;
}
.nav-hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  margin: 5px 0;
  transition: all 0.2s ease;
}
.nav-mobile {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-primary);
  padding: 24px;
  flex-direction: column;
  gap: 24px;
  z-index: 999;
}
.nav-mobile.open { display: flex; }
.nav-mobile a {
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--text-primary);
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}

/* --- Hero --- */
.hero {
  padding: 160px 0 80px;
  background: var(--bg-primary);
}
.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.hero-eyebrow {
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--accent);
  margin-bottom: 16px;
}
.hero h1 {
  font-size: 3.5rem;
  font-weight: 700;
  line-height: 1.15;
  color: var(--text-primary);
}
.hero-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-top: 24px;
  line-height: 1.6;
}
.hero-ctas {
  display: flex;
  gap: 16px;
  margin-top: 32px;
}

/* --- Code Blocks --- */
.code-block {
  background: var(--bg-dark);
  border-radius: 12px;
  overflow: hidden;
  font-family: 'JetBrains Mono', Consolas, monospace;
  font-size: 0.875rem;
  line-height: 1.6;
}
.code-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.code-block-dots {
  display: flex;
  gap: 6px;
}
.code-block-dots span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}
.code-block-dots span:nth-child(1) { background: #EF4444; }
.code-block-dots span:nth-child(2) { background: #F59E0B; }
.code-block-dots span:nth-child(3) { background: #22C55E; }
.code-block-label {
  font-size: 0.75rem;
  color: var(--text-on-dark-muted);
}
.code-block-copy {
  background: none;
  border: none;
  color: var(--text-on-dark-muted);
  cursor: pointer;
  padding: 4px;
  opacity: 0.5;
  transition: opacity 0.15s ease;
}
.code-block-copy:hover { opacity: 1; }
.code-block pre {
  margin: 0;
  padding: 16px;
  overflow-x: auto;
  color: var(--text-on-dark);
}
.code-block code { font-family: inherit; }
.code-highlight-block { color: #FCA5A5; }
.code-highlight-allow { color: #86EFAC; }
.code-highlight-escalate { color: #FDE68A; }
.code-string { color: #A5D6FF; }
.code-key { color: #7DD3FC; }
.code-number { color: #FCA5A5; }

/* --- Stats Bar --- */
.stats {
  padding: 48px 0;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  text-align: center;
}
.stat-item { padding: 16px; }
.stat-item + .stat-item { border-left: 1px solid var(--border); }
.stat-value {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--text-primary);
}
.stat-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-top: 4px;
}
.stats-tagline {
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-top: 24px;
}

/* --- Section Commons --- */
.section {
  padding: 80px 0;
}
.section-alt { background: var(--bg-secondary); }
.section-title {
  font-size: 2.25rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 12px;
}
.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  text-align: center;
  max-width: var(--max-width-narrow);
  margin: 0 auto 48px;
}

/* --- How It Works --- */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  position: relative;
}
.step { text-align: center; }
.step-badge {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  font-size: 1rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}
.step h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 12px;
}
.step p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
}
.step .code-block { text-align: left; }
.steps-line {
  position: absolute;
  top: 20px;
  left: calc(16.67% + 28px);
  right: calc(16.67% + 28px);
  height: 2px;
  border-top: 2px dashed var(--border);
  z-index: 0;
}

/* --- Features --- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.feature-card {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  transition: all 0.3s cubic-bezier(0.25, 0.1, 0.25, 1);
  cursor: default;
}
.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 30px rgba(37, 99, 235, 0.12);
  border-color: var(--accent);
}
.feature-icon {
  width: 40px;
  height: 40px;
  background: var(--accent-subtle);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}
.feature-icon svg { width: 20px; height: 20px; stroke: var(--accent); fill: none; stroke-width: 2; }
.feature-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 8px;
}
.feature-card p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* --- Demo --- */
.demo-widget {
  max-width: 900px;
  margin: 0 auto;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.demo-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.demo-policy-name {
  font-weight: 600;
  font-size: 0.9375rem;
}
.demo-badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 100px;
  background: var(--accent-light);
  color: var(--accent);
}
.demo-actions { padding: 0; }
.demo-action {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
  transition: background 0.15s ease;
}
.demo-action:last-child { border-bottom: none; }
.demo-action-info {
  display: flex;
  align-items: center;
  gap: 12px;
}
.demo-action-icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--bg-elevated);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}
.demo-action-text {
  font-size: 0.9375rem;
  color: var(--text-primary);
}
.demo-action-detail {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin-top: 2px;
}
.demo-result {
  display: flex;
  align-items: center;
  gap: 8px;
  opacity: 0;
  transform: translateX(10px);
  transition: all 0.3s ease;
}
.demo-result.visible {
  opacity: 1;
  transform: translateX(0);
}
.demo-result-message {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  max-width: 220px;
  text-align: right;
}
.decision-badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 100px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  white-space: nowrap;
}
.decision-badge.allow { background: var(--allow-bg); color: var(--allow); border: 1px solid #BBF7D0; }
.decision-badge.block { background: var(--block-bg); color: var(--block); border: 1px solid #FECACA; }
.decision-badge.escalate { background: var(--escalate-bg); color: var(--escalate); border: 1px solid #FDE68A; }
.demo-footer {
  padding: 20px 24px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}
.demo-summary {
  display: flex;
  gap: 16px;
  font-size: 0.875rem;
  color: var(--text-secondary);
}
.demo-summary-item { display: flex; align-items: center; gap: 6px; }
.demo-summary-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}
.demo-summary-dot.allow { background: var(--allow); }
.demo-summary-dot.block { background: var(--block); }
.demo-summary-dot.escalate { background: var(--escalate); }
.demo-note {
  text-align: center;
  font-size: 0.8125rem;
  color: var(--text-tertiary);
  margin-top: 16px;
}
.demo-error {
  padding: 12px 24px;
  background: var(--block-bg);
  color: var(--block);
  font-size: 0.875rem;
  text-align: center;
  display: none;
}
.demo-btn-wrapper {
  text-align: center;
  padding: 20px 24px;
  border-top: 1px solid var(--border);
}
.demo-btn-wrapper .btn { min-width: 200px; }

/* --- Pricing --- */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: start;
}
.pricing-card {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
  position: relative;
  transition: all 0.3s cubic-bezier(0.25, 0.1, 0.25, 1);
}
.pricing-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.pricing-card.featured {
  border-top: 4px solid var(--accent);
  box-shadow: var(--shadow-lg);
}
.pricing-popular {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 16px;
  border-radius: 100px;
}
.pricing-name {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 4px;
}
.pricing-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
}
.pricing-price {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
}
.pricing-amount {
  font-size: 3rem;
  font-weight: 700;
  color: var(--text-primary);
}
.pricing-period {
  font-size: 1rem;
  color: var(--text-secondary);
}
.pricing-features {
  margin-bottom: 24px;
}
.pricing-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
  font-size: 0.9375rem;
  color: var(--text-secondary);
}
.pricing-check {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  color: var(--allow);
}
.pricing-card .btn { width: 100%; }
.pricing-note {
  text-align: center;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-top: 32px;
}

/* --- Footer --- */
.footer {
  background: var(--bg-dark);
  padding: 64px 0 32px;
  color: var(--text-on-dark);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 48px;
}
.footer-brand p {
  font-size: 0.875rem;
  color: var(--text-on-dark-muted);
  margin-top: 16px;
  line-height: 1.5;
}
.footer-social {
  display: flex;
  gap: 16px;
  margin-top: 20px;
}
.footer-social a {
  color: var(--text-on-dark-muted);
  transition: color 0.15s ease;
}
.footer-social a:hover { color: var(--text-on-dark); }
.footer-social svg { width: 20px; height: 20px; }
.footer-col h4 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-on-dark);
  margin-bottom: 16px;
}
.footer-col a {
  display: block;
  font-size: 0.875rem;
  color: var(--text-on-dark-muted);
  padding: 4px 0;
  transition: color 0.15s ease;
}
.footer-col a:hover { color: var(--text-on-dark); }
.footer-bottom {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.1);
  text-align: center;
  font-size: 0.8125rem;
  color: var(--text-on-dark-muted);
}
.footer-logo-white { height: 24px; }
.footer-logo-white text { fill: var(--text-on-dark) !important; }

/* --- Responsive --- */
@media (max-width: 1024px) {
  .hero h1 { font-size: 2.75rem; }
  .hero-inner { grid-template-columns: 1fr; gap: 40px; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); gap: 32px; }
}

@media (max-width: 768px) {
  .nav-links, .nav-ctas { display: none; }
  .nav-hamburger { display: block; }
  .hero { padding: 120px 0 60px; }
  .hero h1 { font-size: 2.25rem; }
  .section { padding: 60px 0; }
  .section-title { font-size: 1.75rem; }
  .steps { grid-template-columns: 1fr; gap: 40px; }
  .steps-line { display: none; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-item + .stat-item { border-left: none; }
  .stat-item:nth-child(odd) { border-right: 1px solid var(--border); }
  .stat-item:nth-child(n+3) { border-top: 1px solid var(--border); }
  .features-grid { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; max-width: 400px; margin: 0 auto; }
  .demo-action { flex-direction: column; align-items: flex-start; gap: 12px; }
  .demo-result { transform: translateX(0); }
  .demo-result-message { text-align: left; max-width: none; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .hero-ctas { flex-direction: column; }
  .hero-ctas .btn { width: 100%; }
}

/* --- Scroll-triggered Fade-In --- */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}
.fade-in-delay-1 { transition-delay: 0.1s; }
.fade-in-delay-2 { transition-delay: 0.2s; }
.fade-in-delay-3 { transition-delay: 0.3s; }
.fade-in-delay-4 { transition-delay: 0.4s; }
.fade-in-delay-5 { transition-delay: 0.5s; }

/* --- Step Card Hover --- */
.step {
  transition: transform 0.25s ease;
}
.step:hover {
  transform: translateY(-4px);
}

/* --- Demo Action Row Hover --- */
.demo-action:hover {
  background: var(--bg-secondary);
}

/* --- Code Block Hover Glow --- */
.hero-code .code-block {
  transition: box-shadow 0.3s ease;
}
.hero-code .code-block:hover {
  box-shadow: 0 0 30px rgba(37, 99, 235, 0.15);
}

/* --- Footer Link Hover --- */
.footer-col a {
  transition: color 0.15s ease, padding-left 0.2s ease;
}
.footer-col a:hover {
  padding-left: 4px;
}

/* --- Button Active Press --- */
.btn:active {
  transform: translateY(1px) scale(0.98);
}

/* --- Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  html { scroll-behavior: auto; }
  .fade-in { opacity: 1; transform: none; }
}