/* ============================================
   Task Reactor — Sales Site
   4px base grid, systematic spacing scale
   ============================================ */

/* --- Reset & Base --- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Backgrounds */
  --bg-primary: #09090b;
  --bg-elevated: #0f0f12;
  --bg-card: #141418;

  /* Borders */
  --border: #1e1e24;
  --border-hover: #2a2a32;

  /* Text */
  --text-primary: #e4e4e7;
  --text-secondary: #8b8b94;
  --text-tertiary: #70707a;

  /* Accent */
  --signal: #2dd4bf;
  --signal-dim: rgba(45, 212, 191, 0.12);

  /* Semantic */
  --danger: #f87171;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;

  /* Spacing scale (4px base) */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;
  --space-24: 96px;
  --space-30: 120px;
  --space-40: 160px;

  /* Radii */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-pill: 100px;

  /* Layout */
  --max-width: 1120px;
  --section-pad: var(--space-24);

  /* Motion */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --duration-fast: 0.15s;
  --duration-med: 0.3s;
  --duration-slow: 0.6s;
}

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

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  font-size: 16px;
  overflow-x: hidden;
}

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

:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

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

  html { scroll-behavior: auto; }

  .reveal { opacity: 1; transform: none; }
  .workflow-step { opacity: 1; transform: none; }
}

/* --- Utilities --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.text-danger {
  color: var(--danger);
}

/* --- Nav --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(9, 9, 11, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

.logo svg {
  color: var(--text-primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav-links a {
  font-size: 14px;
  color: var(--text-secondary);
  transition: color var(--duration-fast);
  padding: var(--space-2) 0;
}

.nav-links a:hover {
  color: var(--text-primary);
}

.nav-links .nav-cta {
  background: var(--text-primary);
  color: var(--bg-primary);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 13px;
  transition: opacity var(--duration-fast);
}

.nav-links .nav-cta:hover {
  color: var(--bg-primary);
  opacity: 0.85;
}

.nav-links .nav-cta:active {
  opacity: 0.7;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 15px;
  border-radius: var(--radius-sm);
  padding: var(--space-3) var(--space-6);
  transition: opacity var(--duration-fast), background var(--duration-fast),
              color var(--duration-fast), border-color var(--duration-fast);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--text-primary);
  color: var(--bg-primary);
  font-weight: 600;
}

.btn-primary:hover {
  opacity: 0.85;
}

.btn-primary:active {
  opacity: 0.7;
}

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

.btn-ghost:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
  background: rgba(255, 255, 255, 0.02);
}

.btn-ghost:active {
  background: rgba(255, 255, 255, 0.04);
}

.btn-large {
  padding: var(--space-4) var(--space-8);
  font-size: 16px;
  border-radius: var(--radius-md);
}

/* --- Hero --- */
.hero {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-40) var(--space-6) var(--space-24);
  overflow: hidden;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 680px;
}

.hero-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--signal);
  border: 1px solid rgba(45, 212, 191, 0.2);
  background: var(--signal-dim);
  padding: var(--space-1) var(--space-4);
  border-radius: var(--radius-pill);
  margin-bottom: var(--space-8);
}

.hero h1 {
  font-size: clamp(40px, 6vw, 60px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.035em;
  margin-bottom: var(--space-6);
  color: var(--text-primary);
  text-wrap: balance;
}

.hero-sub {
  font-size: 18px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-10);
  text-wrap: balance;
}

.hero-actions {
  display: flex;
  gap: var(--space-3);
  justify-content: center;
  flex-wrap: wrap;
}

/* --- Sections --- */
.section {
  padding: var(--section-pad) 0;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--signal);
  margin-bottom: var(--space-4);
}

.section h2 {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-5);
  text-wrap: balance;
}

.section-sub {
  font-size: 17px;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 600px;
}

/* --- Product Screenshot --- */
.section-product {
  padding: 0 0 var(--space-24);
  margin-top: calc(-1 * var(--space-12));
}

.product-frame {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow:
    0 4px 24px rgba(0, 0, 0, 0.4),
    0 0 0 1px rgba(255, 255, 255, 0.03);
}

.product-frame img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
}

/* --- Problem Section --- */
.section-problem {
  border-top: 1px solid var(--border);
}

.problem-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-12);
}

.problem-card {
  border-top: 1px solid var(--border);
  padding: var(--space-6) 0;
}

.problem-icon {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-tertiary);
  margin-bottom: var(--space-5);
}

.problem-card h3 {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-2);
}

.problem-card p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* --- Solution / Workflow --- */
.section-solution {
  position: relative;
  background: var(--bg-elevated);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-solution .section-sub {
  margin-bottom: var(--space-16);
}

.workflow-visual {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
}

.workflow-step {
  display: flex;
  flex-direction: column;
  opacity: 0;
  transform: translateY(var(--space-4));
  transition: opacity 0.5s var(--ease-out), transform 0.5s var(--ease-out);
}

.workflow-step.visible {
  opacity: 1;
  transform: translateY(0);
}

.step-node {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.step-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border-hover);
  flex-shrink: 0;
  transition: background var(--duration-med);
}

.step-node.active .step-dot {
  background: var(--signal);
}

.step-line {
  height: 1px;
  flex: 1;
  background: var(--border);
}

.step-content h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: var(--space-1);
  letter-spacing: -0.01em;
}

.step-content p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --- Features --- */
.section-features {
  border-top: 1px solid var(--border);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-12);
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  padding-left: var(--space-8);
  transition: border-color var(--duration-med) var(--ease-out);
  position: relative;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: var(--space-6);
  left: var(--space-3);
  width: 2px;
  height: var(--space-5);
  background: var(--border);
  border-radius: 1px;
  transition: background var(--duration-med) var(--ease-out);
}

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

.feature-card:hover::before {
  background: var(--signal);
}

.feature-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-tertiary);
  margin-bottom: var(--space-4);
}

.feature-card h3 {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-2);
}

.feature-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* --- Stats --- */
.section-stats {
  background: var(--bg-elevated);
  border-top: 1px solid var(--border);
  padding: var(--space-20) 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  text-align: center;
}

.stats-grid-2 {
  grid-template-columns: 1fr 1fr;
  max-width: 480px;
  margin: 0 auto;
}

.stats-grid-2 .stat-item:first-child {
  border-right: 1px solid var(--border);
}

.stat-item {
  padding: var(--space-6) var(--space-4);
}

.stat-number {
  font-size: 48px;
  font-weight: 700;
  letter-spacing: -0.04em;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
  font-variant-numeric: tabular-nums;
}

.stat-label {
  font-size: 14px;
  color: var(--text-tertiary);
  letter-spacing: 0.01em;
}

/* --- Pricing --- */
.section-pricing {
  border-top: 1px solid var(--border);
}

.pricing-talk {
  margin-top: var(--space-12);
}

.pricing-talk-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  margin-bottom: var(--space-16);
}

.pricing-talk-item {
  border-top: 1px solid var(--border);
  padding: var(--space-6) 0;
}

.pricing-talk-item h3 {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-2);
}

.pricing-talk-item p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* pricing-talk-cta and pricing-talk-note removed — CTA lives in final section */

/* --- CTA --- */
.section-cta {
  text-align: center;
  padding: var(--space-30) 0;
  border-top: 1px solid var(--border);
}

.section-cta h2 {
  text-wrap: balance;
}

.section-cta .section-sub {
  margin-left: auto;
  margin-right: auto;
  margin-bottom: var(--space-10);
  text-wrap: balance;
}

.cta-actions {
  margin-bottom: var(--space-4);
}

.cta-note {
  font-size: 14px;
  color: var(--text-tertiary);
}

.cta-note a {
  color: var(--text-secondary);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--duration-fast);
}

.cta-note a:hover {
  color: var(--text-primary);
}

/* --- Footer --- */
.footer {
  border-top: 1px solid var(--border);
  padding: var(--space-8) 0;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-left {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.footer-logo {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
}

.footer-copy {
  font-size: 13px;
  color: var(--text-tertiary);
}

.footer-right {
  display: flex;
  gap: var(--space-6);
}

.footer-right a {
  font-size: 13px;
  color: var(--text-tertiary);
  transition: color var(--duration-fast);
  padding: var(--space-2) 0;
}

.footer-right a:hover {
  color: var(--text-secondary);
}

/* --- Scroll reveal --- */
.reveal {
  opacity: 0;
  transform: translateY(var(--space-4));
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
}

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

/* --- Responsive --- */
@media (max-width: 1024px) {
  .features-grid,
  .pricing-talk-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .pricing-talk-item:last-child {
    grid-column: 1 / -1;
    max-width: 50%;
    margin: 0 auto;
  }
}

@media (max-width: 768px) {
  :root {
    --section-pad: var(--space-16);
  }

  .nav-links a:not(.nav-cta) {
    display: none;
  }

  .hero {
    padding: var(--space-24) var(--space-5) var(--space-16);
  }

  .hero h1 {
    font-size: 36px;
  }

  .hero-sub {
    font-size: 16px;
  }

  .hero-sub br {
    display: none;
  }

  .problem-grid,
  .features-grid,
  .pricing-talk-grid {
    grid-template-columns: 1fr;
  }

  .stats-grid,
  .stats-grid-2 {
    grid-template-columns: 1fr;
    max-width: 100%;
  }

  .stats-grid-2 .stat-item:first-child {
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .workflow-visual {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .step-line {
    display: none;
  }

  .workflow-step {
    padding-left: var(--space-10);
    position: relative;
    padding-bottom: var(--space-6);
  }

  .workflow-step:not(:last-child)::before {
    content: '';
    position: absolute;
    left: 4px;
    top: 10px;
    bottom: 0;
    width: 1px;
    background: var(--border);
  }

  .step-node {
    position: absolute;
    left: 0;
    top: 0;
  }

  .pricing-talk-item:last-child {
    max-width: 100%;
  }

  .section h2 {
    font-size: 28px;
  }

  .section h2 br {
    display: none;
  }

  .section-cta {
    padding: var(--space-20) 0;
  }

  .stat-number {
    font-size: 32px;
  }

  .feature-card {
    padding-left: var(--space-6);
  }

  .feature-card::before {
    display: none;
  }
}

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-badge {
    margin-bottom: var(--space-6);
  }
}