/* ==========================================================================
   MASS — informational site styles
   Palette + type mirror the application theme:
   accent1 #2196f3 (dim #c0e4ff / #1e3a4c), accent2 #f32196 (dim #ffc0e4 / #4c1e38)
   Poppins headings, Inter body. Light #fafafa / Dark #242424.
   ========================================================================== */

:root {
  --accent: #2196f3;
  --accent-dim: #c0e4ff;
  --accent2: #f32196;
  --accent2-dim: #ffc0e4;

  --bg: #fafafa;
  --surface: #ffffff;
  --surface-2: #f1f3f5;
  --text: #212121;
  --text-muted: #5b6470;
  --border: rgba(33, 33, 33, 0.10);
  --shadow: 0 2px 8px rgba(33, 33, 33, 0.06), 0 12px 32px rgba(33, 33, 33, 0.07);
  --hero-glow-1: rgba(33, 150, 243, 0.18);
  --hero-glow-2: rgba(243, 33, 150, 0.10);

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  --font-body: "Inter", "Roboto", "Helvetica", "Arial", sans-serif;
  --font-heading: "Poppins", var(--font-body);

  --container: 1120px;
}

[data-theme="dark"] {
  --accent-dim: #1e3a4c;
  --accent2-dim: #4c1e38;

  --bg: #242424;
  --surface: #1a1a1a;
  --surface-2: #2e2e2e;
  --text: #ffffff;
  --text-muted: #a6adb5;
  --border: rgba(255, 255, 255, 0.12);
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.35), 0 12px 32px rgba(0, 0, 0, 0.35);
  --hero-glow-1: rgba(33, 150, 243, 0.14);
  --hero-glow-2: rgba(243, 33, 150, 0.10);
}

/* ---------- base ---------- */

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.2;
  margin: 0 0 0.5em;
}

h1 { font-size: clamp(2.1rem, 5vw, 3.4rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.2rem); letter-spacing: -0.01em; }
h3 { font-size: 1.2rem; }

p { margin: 0 0 1em; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

img, svg { max-width: 100%; }

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

.muted { color: var(--text-muted); }
.form__email { margin-top: 14px; cursor: text; user-select: all; }

.eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}

.eyebrow--alt { color: var(--accent2); }

section { padding: 72px 0; }

.section-head {
  max-width: 640px;
  margin-bottom: 40px;
}

.section-head--center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

/* ---------- buttons ---------- */

.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: filter 0.15s ease, background-color 0.15s ease;
}
.btn:hover { text-decoration: none; }

.btn--primary {
  background: var(--accent);
  color: #ffffff;
  transition: filter 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}
.btn--primary:hover {
  filter: brightness(0.95);
  transform: translateY(-1px);
  box-shadow: 0 6px 18px color-mix(in srgb, var(--accent) 35%, transparent);
}
@media (prefers-reduced-motion: reduce) {
  .btn--primary:hover { transform: none; }
}

.btn--outline {
  border-color: var(--accent);
  color: var(--accent);
  background: transparent;
}
.btn--outline:hover { background: var(--accent-dim); }

.btn--small { padding: 8px 16px; font-size: 0.875rem; }

/* ---------- header / nav ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  gap: 24px;
  height: 64px;
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: "Chakra Petch", var(--font-heading);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.06em;
  color: var(--text);
}
.nav__brand:hover { text-decoration: none; }
.nav__brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}
.nav__brand-text small {
  font-family: var(--font-body);
  font-size: 0.58rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  white-space: nowrap;
}
@media (max-width: 640px) {
  .nav__brand-text small { display: none; }
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-left: auto;
  list-style: none;
  padding: 0;
}

.nav__links a {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
}
.nav__links a:hover { color: var(--text); text-decoration: none; }
.nav__links a.is-active { color: var(--accent); }

.nav__actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
}
.theme-toggle:hover { border-color: var(--accent); }
.theme-toggle span { display: inline-flex; }
.theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: inline-flex; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  font-size: 1.2rem;
}

/* ---------- hero ---------- */

.hero {
  position: relative;
  overflow: hidden;
  padding: 88px 0 80px;
}

.hero::before {
  content: "";
  position: absolute;
  inset: -40% -20% auto;
  height: 130%;
  background:
    radial-gradient(600px 420px at 22% 30%, var(--hero-glow-1), transparent 70%),
    radial-gradient(520px 380px at 80% 20%, var(--hero-glow-2), transparent 70%);
  pointer-events: none;
  animation: hero-drift 16s ease-in-out infinite alternate;
}
@keyframes hero-drift {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(3%, 4%) scale(1.06); }
}
@media (prefers-reduced-motion: reduce) {
  .hero::before { animation: none; }
}

/* gradient keyword in headings */
.grad-text {
  background: linear-gradient(95deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero .container {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 56px;
  align-items: center;
}

.hero__copy p.lead {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 34em;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

.hero__note {
  margin-top: 18px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* page hero (inner pages) */
.page-hero {
  padding: 64px 0 40px;
  border-bottom: 1px solid var(--border);
  background:
    radial-gradient(480px 280px at 15% 0%, var(--hero-glow-1), transparent 70%),
    radial-gradient(420px 260px at 85% 10%, var(--hero-glow-2), transparent 70%);
}
.page-hero p { max-width: 640px; color: var(--text-muted); font-size: 1.05rem; }

/* ---------- cards & grids ---------- */

.grid {
  display: grid;
  gap: 24px;
}
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow);
}

.card h3 { margin-top: 14px; }
.card p { color: var(--text-muted); margin-bottom: 0; }

.card__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--accent-dim);
  color: var(--accent);
  font-size: 1.3rem;
}
.card__icon--alt { background: var(--accent2-dim); color: var(--accent2); }

.card--link { transition: transform 0.15s ease, border-color 0.15s ease; }
.card--link:hover { transform: translateY(-3px); border-color: var(--accent); }
a.card-wrap { color: inherit; display: block; }
a.card-wrap:hover { text-decoration: none; }

/* numbered steps */
.step {
  position: relative;
  padding-left: 0;
}
.step__num {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 2rem;
  background: linear-gradient(95deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  opacity: 0.9;
}
.step h3 { margin-top: 4px; }
.step p { color: var(--text-muted); }

/* checklist */
.checklist {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 10px;
}
.checklist li {
  position: relative;
  padding-left: 28px;
  color: var(--text-muted);
}
.checklist li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--accent);
  font-weight: 700;
}

/* feature rows (features page) */
.feature-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
  padding: 56px 0;
  border-bottom: 1px solid var(--border);
}
.feature-row:last-of-type { border-bottom: none; }
.feature-row--flip .feature-row__media { order: -1; }
.feature-row h2 { margin-bottom: 16px; }
.feature-row p { color: var(--text-muted); }

/* stat / trust strip */
.strip {
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 40px 0;
}
.strip .grid { gap: 16px; }
.strip-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}
.strip-item strong { display: block; }
.strip-item span { color: var(--text-muted); font-size: 0.9rem; }

/* CTA band */
.cta-band {
  text-align: center;
  padding: 80px 0;
  background:
    radial-gradient(720px 380px at 18% 120%, var(--hero-glow-1), transparent 70%),
    radial-gradient(720px 380px at 82% -20%, var(--hero-glow-2), transparent 70%);
}
.cta-band h2 { margin-bottom: 12px; }
.cta-band p { color: var(--text-muted); max-width: 520px; margin: 0 auto 28px; }

/* ---------- product mockups (pure CSS) ---------- */

.mock {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  overflow: hidden;
  font-size: 12px;
}

/* hero product-shot: subtle 3D tilt that flattens on hover */
.hero .mock {
  transform: perspective(1400px) rotateY(-7deg) rotateX(2.5deg);
  transition: transform 0.4s ease, box-shadow 0.4s ease, opacity 0.45s ease;
  box-shadow:
    var(--shadow),
    -18px 24px 48px color-mix(in srgb, var(--accent) 12%, transparent);
}
.hero .mock:hover {
  transform: perspective(1400px) rotateY(0deg) rotateX(0deg);
}
@media (max-width: 900px), (prefers-reduced-motion: reduce) {
  .hero .mock, .hero .mock:hover { transform: none; }
}

/* hero showcase: stacked mocks, one visible, tab switcher below */
.hero-mocks { display: grid; align-items: center; }
.hero-mocks .mock {
  grid-area: 1 / 1;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}
.hero-mocks .mock.is-active {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}
.hero-tabs {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 16px;
}
.hero-tab {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 999px;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease, background-color 0.15s ease;
}
.hero-tab:hover { color: var(--text); border-color: var(--accent); }
.hero-tab.is-active {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent);
}

.mock__bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-2);
}
.mock__dot { width: 9px; height: 9px; border-radius: 50%; background: var(--border); }
.mock__title {
  margin-left: 8px;
  font-weight: 600;
  color: var(--text-muted);
  font-size: 11px;
  letter-spacing: 0.04em;
}

.mock__body { padding: 16px; }

/* participation-map mockup */
.am-lane {
  display: grid;
  grid-template-columns: 84px 1fr;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}
.am-lane__label {
  font-weight: 600;
  color: var(--text-muted);
  font-size: 11px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.am-lane__track {
  position: relative;
  height: 18px;
  background: var(--surface-2);
  border-radius: var(--radius-sm);
}
.am-seg {
  position: absolute;
  top: 3px;
  bottom: 3px;
  border-radius: 3px;
  background: var(--accent);
  opacity: 0.9;
  transform-origin: left center;
  animation: seg-grow 0.7s cubic-bezier(0.2, 0.7, 0.3, 1) backwards;
}
.am-lane:nth-child(1) .am-seg { animation-delay: 0.1s; }
.am-lane:nth-child(2) .am-seg { animation-delay: 0.25s; }
.am-lane:nth-child(3) .am-seg { animation-delay: 0.4s; }
.am-lane:nth-child(4) .am-seg { animation-delay: 0.55s; }
@keyframes seg-grow {
  from { transform: scaleX(0); }
  to   { transform: scaleX(1); }
}
@media (prefers-reduced-motion: reduce) {
  .am-seg { animation: none; }
}
.am-seg--alt { background: var(--accent2); }
.am-seg--soft { background: var(--accent); opacity: 0.45; }
.am-seg--soft2 { background: var(--accent2); opacity: 0.45; }

.am-timeline {
  position: relative;
  margin-top: 4px;
}
.am-playhead {
  position: absolute;
  top: -4px;
  bottom: -4px;
  width: 2px;
  background: var(--accent2);
  border-radius: 1px;
  /* lanes are "84px label + 10px gap + track": keep the playhead inside the track */
  left: calc(94px + 2px);
  animation: playhead 9s linear infinite;
}
@keyframes playhead {
  from { left: calc(94px + 2px); }
  to   { left: calc(100% - 4px); }
}
@media (prefers-reduced-motion: reduce) {
  .am-playhead { animation: none; left: 55%; }
}

.am-axis {
  display: flex;
  justify-content: space-between;
  color: var(--text-muted);
  font-size: 10px;
  margin-top: 8px;
  padding-left: 94px;
}

/* labeler mockup */
.lb-frame {
  position: relative;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-md);
  background:
    linear-gradient(160deg, #31404f 0%, #1d2935 60%, #16202a 100%);
  overflow: hidden;
}
[data-theme="dark"] .lb-frame {
  background: linear-gradient(160deg, #2a3845 0%, #18232d 60%, #121b23 100%);
}
.lb-frame::after {
  /* faint floor line to suggest a classroom scene */
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 26%;
  height: 1px;
  background: rgba(255, 255, 255, 0.12);
}
.lb-box {
  position: absolute;
  border: 2px solid var(--accent);
  border-radius: 3px;
  background: rgba(33, 150, 243, 0.10);
}
.lb-box--alt {
  border-color: var(--accent2);
  background: rgba(243, 33, 150, 0.10);
}
.lb-box__tag {
  position: absolute;
  top: -20px;
  left: -2px;
  padding: 1px 7px;
  border-radius: 3px;
  background: var(--accent);
  color: #fff;
  font-size: 10px;
  font-weight: 600;
  white-space: nowrap;
}
.lb-box--alt .lb-box__tag { background: var(--accent2); }

.lb-timeline {
  position: relative;
  height: 26px;
  margin-top: 12px;
  background: var(--surface-2);
  border-radius: var(--radius-sm);
}
.lb-key {
  position: absolute;
  top: 50%;
  width: 9px;
  height: 9px;
  background: var(--accent);
  transform: translate(-50%, -50%) rotate(45deg);
  border-radius: 2px;
}
.lb-key--alt { background: var(--accent2); }

/* agent chat mockup */
.chat { display: grid; gap: 10px; }
.chat__msg {
  max-width: 85%;
  padding: 9px 13px;
  border-radius: var(--radius-md);
  font-size: 12px;
  line-height: 1.5;
}
.chat__msg--user {
  justify-self: end;
  background: var(--accent);
  color: #fff;
  border-bottom-right-radius: 3px;
}
.chat__msg--agent {
  justify-self: start;
  background: var(--surface-2);
  color: var(--text);
  border-bottom-left-radius: 3px;
}
.chat__approval {
  justify-self: start;
  display: flex;
  align-items: center;
  gap: 8px;
  border: 1px dashed var(--accent);
  border-radius: var(--radius-md);
  padding: 8px 12px;
  font-size: 11px;
  color: var(--text-muted);
}
.chat__approval .btn { padding: 4px 12px; font-size: 11px; }

/* ---------- use-case cards ---------- */

.uc-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 26px;
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, border-color 0.2s ease;
}
.uc-card:hover { transform: translateY(-4px); border-color: var(--accent); }
.uc-card h3 { display: flex; align-items: center; gap: 10px; }
.uc-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  background: var(--accent-dim);
  color: var(--accent);
  margin-bottom: 14px;
}
.uc-icon--alt { background: var(--accent2-dim); color: var(--accent2); }
.uc-card:hover .uc-icon { background: var(--accent); color: #ffffff; }
.uc-card:hover .uc-icon--alt { background: var(--accent2); }
@media (prefers-reduced-motion: reduce) {
  .uc-card, .uc-card:hover { transform: none; transition: none; }
}
.uc-card p { color: var(--text-muted); font-size: 0.95rem; margin-bottom: 0; }

.uc-primary {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

/* ---------- contact ---------- */

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.form {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow);
  display: grid;
  gap: 18px;
}
.form label {
  display: grid;
  gap: 6px;
  font-size: 0.875rem;
  font-weight: 600;
}
.form input,
.form select,
.form textarea {
  font: inherit;
  font-size: 0.95rem;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
}
.form input:focus,
.form select:focus,
.form textarea:focus {
  outline: 2px solid var(--accent);
  outline-offset: -1px;
  border-color: transparent;
}
.form textarea { resize: vertical; min-height: 110px; }
.form__status { font-size: 0.875rem; color: var(--accent); min-height: 1.2em; margin: 0; }

/* ---------- reveal-on-scroll ---------- */

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.grid > .reveal:nth-child(2) { transition-delay: 0.12s; }
.grid > .reveal:nth-child(3) { transition-delay: 0.24s; }
.reveal.is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ---------- footer ---------- */

.site-footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}
.site-footer .container {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  align-items: center;
  justify-content: space-between;
}
.site-footer nav { display: flex; gap: 20px; }
.site-footer a { color: var(--text-muted); }
.site-footer a:hover { color: var(--text); }
.site-footer__note {
  flex-basis: 100%;
  margin: 0;
  font-size: 0.8rem;
  color: var(--text-muted);
  opacity: 0.85;
  max-width: 760px;
}
.site-footer__note a {
  color: inherit;
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, currentColor 35%, transparent);
  text-underline-offset: 2px;
}
.site-footer__note a:hover {
  color: var(--text);
  text-decoration-color: currentColor;
}

/* ---------- responsive ---------- */

@media (max-width: 900px) {
  .hero .container,
  .feature-row,
  .uc-primary,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }
  .feature-row--flip .feature-row__media { order: 0; }
  .grid--3 { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
  section { padding: 56px 0; }
  .hero { padding: 56px 0; }
  .grid--3, .grid--2 { grid-template-columns: 1fr; }

  .nav-toggle { display: inline-flex; align-items: center; justify-content: center; margin-left: auto; }
  .nav__links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    margin: 0;
    padding: 16px 24px 20px;
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
  }
  .nav__links.is-open { display: flex; }
  .nav__actions .btn { display: none; }
}