/* Buildpair landing. "Margin Notes": the goal is the page, supporters' notes sit beside it.
   Grotesk for the product voice, an italic serif for the people writing in the margin. */
:root {
  --bg: #fbfbfd;
  --paper: #ffffff;
  --ink: #151a26;
  --sub: #586072;
  --faint: #8a90a0;
  --line: #e4e7ee;
  --blue: #3557d6;
  --royal: #4169e1;
  --tint: #eef2fe;
  --note-ink: #1d2c66;
  --warn: #9a5400;
  --warn-soft: #fdf1e1;
  --shadow: 0 1px 2px rgba(20, 26, 50, 0.05), 0 18px 40px -22px rgba(20, 26, 50, 0.28);
  --sans: "Schibsted Grotesk", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1117;
    --paper: #161a23;
    --ink: #e9ebf1;
    --sub: #a1a8b8;
    --faint: #7c8394;
    --line: #2a303c;
    --blue: #8da8ff;
    --royal: #7f9cff;
    --tint: #1b2340;
    --note-ink: #d6defd;
    --warn: #f0b062;
    --warn-soft: #2e2416;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 18px 40px -22px rgba(0, 0, 0, 0.7);
    color-scheme: dark;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}
[hidden] {
  display: none !important;
}
html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.55;
  padding-inline: max(16px, env(safe-area-inset-left));
  padding-block: 0;
  -webkit-font-smoothing: antialiased;
}
main,
.nav,
.foot {
  max-width: 1160px;
  margin-inline: auto;
}
a {
  color: var(--blue);
}
h1,
h2,
h3 {
  margin: 0;
  text-wrap: balance;
  letter-spacing: -0.02em;
}
p {
  margin: 0;
}
:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
  border-radius: 4px;
}
.skip {
  position: absolute;
  left: -9999px;
}
.skip:focus {
  left: 16px;
  top: 12px;
  background: var(--paper);
  padding: 8px 12px;
  z-index: 10;
}

/* Nav */
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-block: 18px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--ink);
  text-decoration: none;
  font-weight: 800;
  font-size: 21px;
  letter-spacing: -0.03em;
}
.brand svg {
  width: 30px;
  height: 30px;
}
.mark-fill {
  fill: var(--royal);
}
.mark-line {
  stroke: var(--ink);
}
.nav nav {
  display: flex;
  align-items: center;
  gap: 22px;
  font-size: 15px;
}
.nav nav a {
  color: var(--sub);
  text-decoration: none;
}
.nav nav a:hover {
  color: var(--ink);
}
.nav nav a.btn {
  color: #fff;
}
@media (max-width: 760px) {
  .nav nav a:not(.btn):not(.signin) {
    display: none;
  }
  .nav nav {
    gap: 14px;
  }
}

/* Buttons and fields */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  border: 0;
  border-radius: 12px;
  padding: 14px 18px;
  background: var(--blue);
  color: #fff;
  font: 600 16px / 1.2 var(--sans);
  text-decoration: none;
  cursor: pointer;
  transition:
    transform 0.12s ease,
    filter 0.12s ease;
}
@media (prefers-color-scheme: dark) {
  .btn {
    background: #4169e1;
  }
}
.btn:hover {
  filter: brightness(1.06);
}
.btn:active {
  transform: translateY(1px);
}
.btn[disabled] {
  opacity: 0.55;
  cursor: progress;
}
.btn-small {
  width: auto;
  padding: 9px 14px;
  font-size: 14px;
  border-radius: 10px;
}
.btn-google {
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--line);
}
.btn-google svg {
  width: 18px;
  height: 18px;
}
.link {
  background: none;
  border: 0;
  padding: 0;
  color: var(--blue);
  font: inherit;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* Hero */
.hero {
  display: grid;
  gap: 48px;
  padding-block: 28px 72px;
  align-items: start;
}
@media (min-width: 980px) {
  .hero {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.08fr);
    gap: 56px;
    padding-block: 48px 96px;
  }
}
.hero-copy {
  display: grid;
  gap: 20px;
  min-width: 0;
}
.eyebrow {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--blue);
}
h1 {
  font-size: clamp(44px, 8.2vw, 76px);
  line-height: 0.98;
  font-weight: 800;
  letter-spacing: -0.045em;
}
.lede {
  font-size: clamp(17px, 2vw, 19px);
  color: var(--sub);
  max-width: 34em;
}

.signup {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 22px;
  box-shadow: var(--shadow);
  max-width: 440px;
  margin-top: 8px;
  scroll-margin-top: 24px;
}
.signup form,
.signup [data-step] {
  display: grid;
  gap: 14px;
}
.signup-title {
  font-size: 20px;
  font-weight: 700;
}
.signup-sub {
  font-size: 14px;
  color: var(--sub);
  margin-top: -8px;
}
.fields {
  display: grid;
  gap: 6px;
}
.fields label {
  font-size: 13px;
  font-weight: 600;
  color: var(--sub);
  margin-top: 4px;
}
.fields input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 11px;
  padding: 12px 13px;
  font: 16px / 1.3 var(--sans);
  color: var(--ink);
  background: var(--bg);
}
.fields input:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px var(--tint);
}
#code {
  font-size: 22px;
  letter-spacing: 0.3em;
  font-variant-numeric: tabular-nums;
}
.or {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--faint);
  font-size: 13px;
}
.or::before,
.or::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line);
}
.form-error {
  color: #c0392b;
  font-size: 14px;
  min-height: 0;
}
.form-error:empty {
  display: none;
}
@media (prefers-color-scheme: dark) {
  .form-error {
    color: #ff8a80;
  }
}
.fine,
.signup-links {
  font-size: 13px;
  color: var(--faint);
}

/* Hero visual: the page and its margin notes */
.hero-visual {
  display: grid;
  gap: 14px;
  min-width: 0;
  position: relative;
}
@media (min-width: 640px) {
  .hero-visual {
    grid-template-columns: minmax(0, 1fr) 210px;
    gap: 18px;
    align-items: start;
  }
}
.page {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 20px;
  box-shadow: var(--shadow);
  display: grid;
  gap: 16px;
  animation: rise 0.6s ease both;
}
.page-head {
  display: flex;
  align-items: center;
  gap: 12px;
}
.page-head b {
  display: block;
  font-size: 17px;
}
.page-head span {
  font-size: 13px;
  color: var(--sub);
}
.page-head .faces {
  margin-left: auto;
}
.page-head .sp-ico,
.space-card .sp-ico,
.chat-head .sp-ico,
.sp-ico {
  color: #fff;
  font-size: 15px;
}
.sp-ico {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: var(--c);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 700;
  flex: none;
}
.faces {
  display: inline-flex;
}
.faces i,
.note i,
.msg > i {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--c);
  color: #fff;
  display: grid;
  place-items: center;
  font-style: normal;
  font-size: 11px;
  font-weight: 700;
  border: 2px solid var(--paper);
  flex: none;
}
.faces i + i {
  margin-left: -8px;
}
.goal {
  display: grid;
  gap: 8px;
  padding: 14px;
  border-radius: 12px;
  background: var(--bg);
}
.goal-top {
  display: flex;
  justify-content: space-between;
  font-size: 15px;
}
.goal-top span,
.goal-meta {
  color: var(--sub);
  font-size: 13px;
}
.bar {
  height: 6px;
  border-radius: 3px;
  background: var(--line);
  overflow: hidden;
}
.bar i {
  display: block;
  height: 100%;
  background: var(--royal);
  border-radius: 3px;
  animation: grow 1.2s 0.3s ease both;
}
.todos {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
}
.todos li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 0;
  border-top: 1px solid var(--line);
  font-size: 15px;
}
.todos li:first-child {
  border-top: 0;
}
.ck {
  width: 19px;
  height: 19px;
  border-radius: 50%;
  border: 1.5px solid #b4bac8;
  flex: none;
  position: relative;
}
.todos li.done {
  color: var(--faint);
  text-decoration: line-through;
}
.todos li.done .ck {
  background: var(--royal);
  border-color: var(--royal);
}
.todos li.done .ck::after,
.tick::after {
  content: "";
  position: absolute;
  left: 5.5px;
  top: 2.5px;
  width: 4px;
  height: 8px;
  border-right: 2px solid #fff;
  border-bottom: 2px solid #fff;
  transform: rotate(45deg);
}
.chatline {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 10px;
  font-size: 14px;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
}
.tick {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--royal);
  position: relative;
  flex: none;
}
.tick::after {
  left: 7.5px;
  top: 4px;
}
.reacts {
  display: inline-flex;
  gap: 5px;
}
.reacts span {
  font-size: 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 1px 9px;
  color: var(--sub);
  background: var(--paper);
}
.reacts span.mine {
  border-color: var(--royal);
  color: var(--blue);
  background: var(--tint);
}

.notes {
  display: grid;
  gap: 14px;
  align-content: start;
}
@media (min-width: 640px) {
  .notes {
    padding-top: 64px;
  }
}
.note {
  position: relative;
  display: grid;
  grid-template-columns: 26px 1fr;
  gap: 4px 10px;
  align-items: start;
  background: var(--tint);
  color: var(--note-ink);
  border-radius: 4px 14px 14px 14px;
  padding: 12px 13px;
  animation: slide 0.55s ease both;
}
.note p {
  font-family: var(--serif);
  font-style: italic;
  font-size: 16px;
  line-height: 1.38;
  grid-column: 2;
}
.note span {
  grid-column: 2;
  font-size: 12px;
  color: var(--sub);
}
.note i {
  grid-row: span 2;
  border-color: var(--tint);
}
.note.quiet {
  grid-template-columns: 1fr;
  background: var(--warn-soft);
  color: var(--warn);
}
.note.quiet p,
.note.quiet span {
  grid-column: 1;
}
.note.quiet span {
  color: var(--warn);
  opacity: 0.85;
}
@media (min-width: 640px) {
  .note::before {
    content: "";
    position: absolute;
    left: -18px;
    top: 18px;
    width: 18px;
    height: 1px;
    background: var(--royal);
    opacity: 0.45;
  }
  .note.quiet::before {
    background: var(--warn);
  }
}
.n1 {
  animation-delay: 0.45s;
}
.n2 {
  animation-delay: 0.75s;
}
.n3 {
  animation-delay: 1.05s;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}
@keyframes slide {
  from {
    opacity: 0;
    transform: translateX(14px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}
@keyframes grow {
  from {
    width: 0;
  }
}
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
  html {
    scroll-behavior: auto;
  }
}

/* Sections */
section:not(.hero) {
  padding-block: 64px;
  border-top: 1px solid var(--line);
}
.section-title {
  font-size: clamp(30px, 4.6vw, 44px);
  line-height: 1.05;
  font-weight: 800;
  letter-spacing: -0.035em;
  max-width: 18em;
}
.section-sub {
  color: var(--sub);
  max-width: 40em;
  margin-top: 14px;
}

.steps {
  list-style: none;
  padding: 0;
  margin: 36px 0 0;
  display: grid;
  gap: 28px;
}
@media (min-width: 860px) {
  .steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 32px;
  }
}
.steps li {
  display: grid;
  gap: 10px;
  align-content: start;
}
.num {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--tint);
  color: var(--blue);
  font-weight: 800;
  display: grid;
  place-items: center;
}
.steps h3 {
  font-size: 21px;
}
.steps p {
  color: var(--sub);
}

.chat-first {
  display: grid;
  gap: 40px;
  align-items: center;
}
@media (min-width: 900px) {
  .chat-first {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 64px;
  }
}
.chat-copy {
  display: grid;
  gap: 18px;
}
.chat-copy p {
  color: var(--sub);
  max-width: 34em;
}
.checks {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 10px;
}
.checks li {
  position: relative;
  padding-left: 30px;
}
.checks li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--tint);
}
.checks li::after {
  content: "";
  position: absolute;
  left: 6.5px;
  top: 7.5px;
  width: 4px;
  height: 8px;
  border-right: 2px solid var(--blue);
  border-bottom: 2px solid var(--blue);
  transform: rotate(45deg);
}
.chat-demo {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 18px;
  box-shadow: var(--shadow);
  display: grid;
  gap: 14px;
  min-width: 0;
}
.chat-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}
.chat-head .sp-ico {
  width: 30px;
  height: 30px;
  font-size: 14px;
}
.online {
  margin-left: auto;
  font-size: 13px;
  color: var(--sub);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.online::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #2fb36b;
}
.msg {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  font-size: 15px;
}
.msg > div {
  display: grid;
  gap: 5px;
  justify-items: start;
}
.msg small {
  color: var(--faint);
  font-size: 12px;
}
.roll {
  width: 24px;
  height: 24px;
  border-radius: 7px;
  background: var(--bg);
  border: 1px solid var(--line);
  color: var(--sub);
  font-size: 12px;
  font-weight: 700;
  display: grid;
  place-items: center;
}
.skip {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 1.5px solid #b4bac8;
  position: relative;
}
.skip::after {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  width: 9px;
  height: 2px;
  background: #8a90a0;
}
.bubble {
  background: var(--tint);
  color: var(--note-ink);
  border-radius: 4px 14px 14px 14px;
  padding: 9px 12px;
}
.bubble.plain {
  background: var(--bg);
  color: var(--ink);
}

.spaces {
  margin-top: 32px;
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}
.space-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 18px;
  display: grid;
  gap: 6px;
  align-content: start;
}
.space-card .sp-ico {
  margin-bottom: 6px;
}
.space-card b {
  font-size: 18px;
}
.space-card span {
  color: var(--sub);
  font-size: 15px;
}
.space-card em {
  font-style: normal;
  font-size: 13px;
  color: var(--blue);
  margin-top: 6px;
}

.principles {
  display: grid;
  gap: 28px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}
.principles h3 {
  font-size: 19px;
  margin-bottom: 8px;
}
.principles p {
  color: var(--sub);
  font-size: 16px;
}

.final {
  text-align: left;
  display: grid;
  gap: 16px;
  justify-items: start;
  padding-block: 80px !important;
}
.final h2 {
  font-size: clamp(32px, 5.4vw, 54px);
  line-height: 1.02;
  font-weight: 800;
  letter-spacing: -0.04em;
  max-width: 14em;
}
.final p {
  color: var(--sub);
}
.final .btn {
  width: auto;
  padding-inline: 26px;
  margin-top: 8px;
}

.foot {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  padding-block: 28px max(28px, env(safe-area-inset-bottom));
  border-top: 1px solid var(--line);
  font-size: 14px;
  color: var(--sub);
}
.foot a {
  color: var(--sub);
}

/* Simple prose pages (privacy) */
.prose {
  max-width: 680px;
  margin-inline: auto;
  padding-block: 24px 80px;
  display: grid;
  gap: 16px;
}
.prose h1 {
  font-size: clamp(36px, 6vw, 52px);
}
.prose h2 {
  font-size: 22px;
  margin-top: 18px;
}
.prose p,
.prose li {
  color: var(--sub);
}
.prose ul {
  margin: 0;
  padding-left: 22px;
  display: grid;
  gap: 6px;
}