:root {
  --color-bg: #f9fafb;
  --color-surface: #ffffff;
  --color-text: #111827;
  --color-text-muted: #6b7280;
  --color-border: #e5e7eb;
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-focus: #3b82f6;
  --color-error: #dc2626;
  --color-error-bg: #fef2f2;
  --color-success: #059669;
  --color-success-bg: #ecfdf5;
  --color-warning: #d97706;
  --color-warning-bg: #fffbeb;
  --color-footer-bg: #111827;
  --color-footer-text: #d1d5db;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --radius: 0.375rem;
  --radius-lg: 0.75rem;
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --transition: 150ms cubic-bezier(0.4, 0, 0.2, 1);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  width: 100%;
  max-width: 72rem;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1rem;
  padding-right: 1rem;
}

@media (min-width: 640px) {
  .container { padding-left: 1.5rem; padding-right: 1.5rem; }
}

@media (min-width: 1024px) {
  .container { padding-left: 2rem; padding-right: 2rem; }
}

/* Skip link */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Header */
.site-header {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 50;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 3.5rem;
  max-width: 72rem;
  margin: 0 auto;
  padding: 0 1rem;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--color-text);
  font-weight: 600;
  font-size: 1.125rem;
}

.logo-mark {
  color: var(--color-primary);
  font-size: 1.25rem;
}

.nav-link {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: color var(--transition);
}

.nav-link:hover {
  color: var(--color-text);
}

.nav-link:focus-visible,
.btn:focus-visible,
.demo-cell:focus-visible,
.demo-select:focus-visible,
.waitlist-input:focus-visible {
  outline: 2px solid var(--color-primary-focus);
  outline-offset: 2px;
}

/* Hero */
.hero {
  padding: 4rem 0 3rem;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.hero-eyebrow {
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
}

.hero-title {
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.025em;
  margin: 0 0 1rem;
  color: var(--color-text);
}

@media (min-width: 640px) {
  .hero-title { font-size: 3rem; }
}

.hero-accent {
  color: var(--color-primary);
}

.hero-description {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  max-width: 40rem;
  margin: 0 0 1.5rem;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 0.75rem;
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background-color var(--transition), color var(--transition), border-color var(--transition);
  user-select: none;
}

.btn-primary {
  background-color: var(--color-primary);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: var(--color-primary-hover);
}

.btn-secondary {
  background-color: var(--color-surface);
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn-secondary:hover {
  background-color: var(--color-bg);
}

.btn-small {
  padding: 0.25rem 0.75rem;
  font-size: 0.8125rem;
}

.btn-outline {
  background-color: transparent;
  border-color: var(--color-border);
  color: var(--color-text-muted);
}

.btn-outline:hover {
  background-color: var(--color-bg);
  color: var(--color-text);
}

/* Sections */
.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  margin: 0 0 0.5rem;
  color: var(--color-text);
}

.section-subtitle {
  font-size: 1rem;
  color: var(--color-text-muted);
  margin: 0 0 2rem;
}

/* Features */
.features {
  padding: 3rem 0;
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 640px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
  .features-grid { grid-template-columns: repeat(4, 1fr); }
}

.feature-card {
  padding: 1.25rem;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.feature-title {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
  color: var(--color-text);
}

.feature-desc {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin: 0;
  line-height: 1.5;
}

/* Demo */
.demo-section {
  padding: 3rem 0;
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.demo-app {
  max-width: 56rem;
  margin: 0 auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background-color: var(--color-bg);
  overflow: hidden;
}

.demo-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.demo-toolbar-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.demo-label {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.demo-select {
  font-size: 0.8125rem;
  padding: 0.25rem 0.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background-color: var(--color-surface);
  color: var(--color-text);
}

.demo-grid-wrap {
  overflow-x: auto;
  padding: 1rem;
}

.demo-grid {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8125rem;
  min-width: 600px;
}

.demo-grid th,
.demo-grid td {
  padding: 0.375rem 0.5rem;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.demo-grid th {
  font-weight: 600;
  color: var(--color-text-muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background-color: var(--color-surface);
}

.demo-cell {
  width: 100%;
  padding: 0.25rem 0.375rem;
  border: 1px solid var(--color-border);
  border-radius: calc(var(--radius) - 2px);
  font-size: 0.8125rem;
  background-color: var(--color-surface);
  color: var(--color-text);
  transition: border-color var(--transition);
}

.demo-cell:focus {
  border-color: var(--color-primary-focus);
}

.demo-select-cell {
  min-width: 120px;
}

.demo-cell--error {
  border-color: var(--color-error);
  background-color: var(--color-error-bg);
}

.demo-cell--error:focus {
  border-color: var(--color-error);
  outline-color: var(--color-error);
}

.demo-row--error .demo-cell {
  border-color: var(--color-error);
}

.demo-tooltip {
  position: relative;
}

.demo-tooltip::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 100%;
  left: 0;
  margin-bottom: 4px;
  padding: 0.25rem 0.5rem;
  background-color: #1f2937;
  color: #ffffff;
  font-size: 0.75rem;
  border-radius: var(--radius);
  white-space: nowrap;
  z-index: 10;
  pointer-events: none;
}

.demo-paste-zone {
  padding: 1rem;
  border-top: 1px solid var(--color-border);
  background-color: var(--color-surface);
}

.demo-paste-label {
  display: block;
  font-size: 0.875rem;
  margin-bottom: 0.5rem;
}

.demo-paste-input {
  width: 100%;
  padding: 0.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  background-color: var(--color-bg);
  color: var(--color-text);
  resize: vertical;
  min-height: 80px;
}

.demo-paste-input:focus {
  border-color: var(--color-primary-focus);
  outline: 2px solid var(--color-primary-focus);
  outline-offset: 2px;
}

.demo-help {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin: 0.375rem 0 0.75rem;
}

.demo-status {
  min-height: 1.5rem;
  padding: 0 1rem;
  font-size: 0.8125rem;
}

.demo-status--success { color: var(--color-success); }
.demo-status--error   { color: var(--color-error); }
.demo-status--warning { color: var(--color-warning); }

.demo-counter {
  padding: 0.75rem 1rem;
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.demo-counter progress {
  flex: 1;
  min-width: 120px;
  height: 0.5rem;
  border-radius: 9999px;
  overflow: hidden;
  -webkit-appearance: none;
  appearance: none;
}

.demo-counter progress::-webkit-progress-bar {
  background-color: var(--color-border);
  border-radius: 9999px;
}

.demo-counter progress::-webkit-progress-value {
  background-color: var(--color-primary);
  border-radius: 9999px;
  transition: width var(--transition);
}

.demo-counter progress::-moz-progress-bar {
  background-color: var(--color-primary);
  border-radius: 9999px;
}

/* Pricing */
.pricing {
  padding: 3rem 0;
}

.pricing-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  max-width: 40rem;
  margin: 0 auto;
}

@media (min-width: 640px) {
  .pricing-grid { grid-template-columns: repeat(2, 1fr); }
  .pricing-grid .pricing-card--featured { transform: scale(1.02); }
}

.pricing-card {
  padding: 1.5rem;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  text-align: center;
}

.pricing-card--featured {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.pricing-tier {
  font-size: 1.125rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
  color: var(--color-text);
}

.pricing-price {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-text);
  margin: 0 0 1rem;
}

.pricing-period {
  font-size: 1rem;
  font-weight: 400;
  color: var(--color-text-muted);
}

.pricing-features {
  list-style: none;
  padding: 0;
  margin: 0 0 1rem;
  text-align: left;
}

.pricing-features li {
  padding: 0.25rem 0;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border);
}

.pricing-features li:last-child {
  border-bottom: none;
}

.pricing-note {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin: 0;
}

/* Waitlist */
.waitlist {
  padding: 3rem 0;
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

.waitlist-form {
  display: flex;
  gap: 0.75rem;
  max-width: 28rem;
  margin: 0 auto 1rem;
  flex-wrap: wrap;
}

.waitlist-input {
  flex: 1;
  min-width: 200px;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.875rem;
  background-color: var(--color-bg);
  color: var(--color-text);
}

.waitlist-message {
  min-height: 1.25rem;
  font-size: 0.875rem;
  text-align: center;
  margin: 0 0 0.5rem;
}

.waitlist-message--success { color: var(--color-success); }
.waitlist-message--error   { color: var(--color-error); }

.waitlist-privacy {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  text-align: center;
}

/* Footer */
.site-footer {
  padding: 2rem 0;
  background-color: var(--color-footer-bg);
  color: var(--color-footer-text);
  text-align: center;
}

.footer-text {
  font-size: 0.875rem;
  margin: 0 0 0.5rem;
}

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

.footer-link:hover {
  color: #ffffff;
}

.footer-legal {
  font-size: 0.75rem;
  color: #9ca3af;
  margin: 0;
}

/* Utility */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}