:root {
  --collab-black: #050505;
  --collab-pink: #ff73c7;
  --collab-cream: #fff7f1;
  --collab-white: #ffffff;
  --collab-gray: #6f676c;
  --collab-pad: clamp(20px, 4vw, 64px);
}

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

html {
  min-height: 100%;
  scroll-behavior: smooth;
}

body {
  min-height: 100%;
  margin: 0;
  color: var(--collab-black);
  background: var(--collab-cream);
  font-family: Arial, "Helvetica Neue", Helvetica, Pretendard, sans-serif;
  line-height: 1.5;
  word-break: keep-all;
  overflow-x: hidden;
}

a {
  color: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  font: inherit;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

.collab-skip-link {
  position: fixed;
  z-index: 10000;
  top: 8px;
  left: 8px;
  padding: 12px 16px;
  color: var(--collab-black);
  background: var(--collab-pink);
  font-size: 13px;
  font-weight: 900;
  transform: translateY(-160%);
}

.collab-skip-link:focus {
  transform: translateY(0);
}

.collab-hero {
  min-height: 780px;
  padding: clamp(50px, 7vw, 96px) var(--collab-pad) clamp(44px, 6vw, 82px);
  color: var(--collab-white);
  background: var(--collab-black);
}

.collab-hero__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-bottom: 18px;
  color: var(--collab-pink);
  border-bottom: 1px solid rgba(255, 115, 199, 0.72);
}

.collab-hero__meta p,
.collab-hero__meta span {
  margin: 0;
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.03em;
}

.collab-hero h1 {
  max-width: 1260px;
  margin: clamp(62px, 8vw, 118px) 0 clamp(54px, 7vw, 100px);
  color: var(--collab-pink);
  font-size: clamp(66px, 10.8vw, 166px);
  font-weight: 500;
  line-height: 0.83;
  letter-spacing: -0.06em;
}

.collab-hero__bottom {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 44px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.72);
}

.collab-hero__bottom > p {
  max-width: 720px;
  margin: 0;
  font-size: clamp(18px, 2vw, 28px);
  font-weight: 700;
  line-height: 1.55;
}

.collab-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.button {
  display: inline-flex;
  min-height: 52px;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
  padding: 0 18px;
  border: 1px solid currentColor;
  font-size: 13px;
  font-weight: 900;
  text-decoration: none;
  transition: color 160ms ease, background-color 160ms ease;
}

.button--pink {
  color: var(--collab-black);
  background: var(--collab-pink);
  border-color: var(--collab-pink);
}

.button--line {
  color: var(--collab-white);
  background: transparent;
  border-color: rgba(255, 255, 255, 0.72);
}

.button:hover,
.button:focus-visible {
  color: var(--collab-black);
  background: var(--collab-white);
  border-color: var(--collab-white);
}

.button:focus-visible,
.collab-footer a:focus-visible,
.collab-footer button:focus-visible {
  outline: 3px solid var(--collab-pink);
  outline-offset: 3px;
}

.proof-section,
.flow-section,
.measurement-section,
.terms-section {
  padding: clamp(82px, 10vw, 150px) var(--collab-pad);
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(150px, 0.42fr) minmax(0, 1.58fr);
  gap: 48px;
  padding-bottom: clamp(54px, 7vw, 98px);
}

.section-heading > p,
.measurement-intro > p,
.terms-section > div > p,
.contact-section > p:first-child {
  margin: 0;
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.04em;
}

.section-heading h2,
.measurement-intro h2,
.terms-section h2,
.contact-section h2 {
  max-width: 1050px;
  margin: 0;
  font-size: clamp(50px, 7.2vw, 108px);
  font-weight: 500;
  line-height: 0.92;
  letter-spacing: -0.055em;
}

.section-heading > div > p {
  max-width: 720px;
  margin: 34px 0 0;
  color: var(--collab-gray);
  font-size: 15px;
  font-weight: 700;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 2px solid var(--collab-black);
  border-left: 2px solid var(--collab-black);
}

.metric-card {
  display: flex;
  min-height: 200px;
  flex-direction: column;
  justify-content: space-between;
  padding: clamp(22px, 3vw, 38px);
  border-right: 2px solid var(--collab-black);
  border-bottom: 2px solid var(--collab-black);
}

.metric-card strong {
  color: var(--collab-pink);
  font-size: clamp(38px, 5vw, 74px);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.05em;
}

.metric-card span {
  font-size: 13px;
  font-weight: 900;
}

.proof-note {
  max-width: 760px;
  margin: 28px 0 0 auto;
  color: var(--collab-gray);
  font-size: 12px;
  font-weight: 700;
  line-height: 1.65;
}

.offer-section {
  padding: clamp(82px, 10vw, 150px) var(--collab-pad);
  color: var(--collab-pink);
  background: var(--collab-black);
}

.section-heading--light > div > p {
  color: var(--collab-white);
}

.offer-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid rgba(255, 115, 199, 0.68);
  border-left: 1px solid rgba(255, 115, 199, 0.68);
}

.offer-card {
  min-height: 330px;
  padding: clamp(26px, 4vw, 52px);
  border-right: 1px solid rgba(255, 115, 199, 0.68);
  border-bottom: 1px solid rgba(255, 115, 199, 0.68);
}

.offer-card > p {
  margin-bottom: clamp(70px, 8vw, 120px);
  font-size: 12px;
  font-weight: 900;
}

.offer-card h3 {
  margin-bottom: 20px;
  color: var(--collab-white);
  font-size: clamp(30px, 4vw, 54px);
  font-weight: 500;
  line-height: 1;
}

.offer-card span {
  display: block;
  max-width: 620px;
  color: #d8d0d5;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.7;
}

.flow-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 2px solid var(--collab-black);
  border-left: 2px solid var(--collab-black);
}

.flow-step {
  min-height: 390px;
  padding: clamp(24px, 3vw, 42px);
  border-right: 2px solid var(--collab-black);
  border-bottom: 2px solid var(--collab-black);
}

.flow-step > div {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: clamp(74px, 9vw, 136px);
}

.flow-step > div span,
.flow-step > div p {
  margin: 0;
  font-size: 11px;
  font-weight: 900;
}

.flow-step h3 {
  margin-bottom: 22px;
  font-size: clamp(30px, 3.7vw, 52px);
  font-weight: 500;
  line-height: 1;
}

.flow-step > p {
  margin: 0;
  color: var(--collab-gray);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.7;
}

.guide-proof {
  display: grid;
  grid-template-columns: minmax(180px, 0.4fr) minmax(0, 1.6fr);
  gap: 40px;
  margin-top: clamp(58px, 8vw, 110px);
  padding-top: 20px;
  border-top: 2px solid var(--collab-black);
}

.guide-proof > p {
  margin: 0;
  font-size: 12px;
  font-weight: 900;
}

.guide-proof nav {
  display: grid;
}

.guide-proof a {
  display: flex;
  min-height: 64px;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  border-bottom: 1px solid var(--collab-black);
  font-size: 15px;
  font-weight: 900;
  text-decoration: none;
}

.guide-proof a:hover,
.guide-proof a:focus-visible {
  padding-left: 12px;
  color: var(--collab-pink);
  background: var(--collab-black);
}

.measurement-section {
  color: var(--collab-black);
  background: var(--collab-pink);
}

.measurement-intro {
  display: grid;
  grid-template-columns: minmax(150px, 0.42fr) minmax(0, 1.1fr) minmax(260px, 0.48fr);
  gap: 48px;
  align-items: end;
  padding-bottom: clamp(54px, 7vw, 96px);
}

.measurement-intro ul {
  margin: 0;
  padding: 0;
  border-top: 2px solid var(--collab-black);
  list-style: none;
}

.measurement-intro li {
  padding: 15px 0;
  border-bottom: 1px solid var(--collab-black);
  font-size: 13px;
  font-weight: 900;
}

.event-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 2px solid var(--collab-black);
  border-left: 2px solid var(--collab-black);
}

.event-card {
  min-height: 250px;
  padding: clamp(20px, 2.5vw, 34px);
  border-right: 2px solid var(--collab-black);
  border-bottom: 2px solid var(--collab-black);
}

.event-card code {
  display: inline-block;
  margin-bottom: clamp(56px, 7vw, 92px);
  color: var(--collab-black);
  font-family: Arial, "Helvetica Neue", Helvetica, sans-serif;
  font-size: 11px;
  font-weight: 900;
}

.event-card h3 {
  margin-bottom: 14px;
  font-size: 24px;
  line-height: 1.1;
}

.event-card p {
  margin: 0;
  font-size: 13px;
  font-weight: 700;
  line-height: 1.6;
}

.measurement-boundary {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 40px;
  margin-top: 38px;
}

.measurement-boundary p {
  margin: 0;
  padding-top: 18px;
  border-top: 2px solid var(--collab-black);
  font-size: 14px;
  font-weight: 800;
  line-height: 1.7;
}

.terms-section {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr);
  gap: 70px;
  color: var(--collab-white);
  background: var(--collab-black);
}

.terms-section > div > p {
  margin-bottom: 38px;
  color: var(--collab-pink);
}

.terms-section h2 {
  color: var(--collab-pink);
}

.terms-section ul {
  align-self: end;
  margin: 0;
  padding: 0;
  border-top: 1px solid rgba(255, 115, 199, 0.68);
  list-style: none;
}

.terms-section li {
  padding: 22px 0;
  border-bottom: 1px solid rgba(255, 115, 199, 0.68);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.7;
}

.contact-section {
  min-height: 690px;
  padding: clamp(82px, 10vw, 150px) var(--collab-pad);
  color: var(--collab-white);
  background: var(--collab-black);
  border-top: 1px solid rgba(255, 115, 199, 0.68);
}

.contact-section > p:first-child {
  color: var(--collab-pink);
}

.contact-section h2 {
  max-width: 1160px;
  margin: clamp(44px, 6vw, 80px) 0 36px;
  color: var(--collab-pink);
}

.contact-section > p:not(:first-child) {
  max-width: 720px;
  margin-bottom: 42px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.7;
}

.contact-email {
  display: inline-block;
  margin-top: 12px;
  color: var(--collab-pink);
  font-weight: 900;
  text-underline-offset: 5px;
}

.collab-footer {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 34px 60px;
  padding: 48px var(--collab-pad) 30px;
  color: var(--collab-black);
  background: var(--collab-pink);
}

.collab-footer > p {
  margin: 0;
  font-size: 20px;
  font-weight: 900;
}

.collab-footer > div {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
}

.collab-footer a,
.collab-footer button {
  padding: 0;
  color: var(--collab-black);
  background: transparent;
  border: 0;
  cursor: pointer;
  font-size: 13px;
  font-weight: 900;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.collab-footer > span {
  grid-column: 1 / -1;
  font-size: 10px;
  font-weight: 900;
}

@media (max-width: 980px) {
  .collab-hero__bottom,
  .section-heading,
  .measurement-intro,
  .terms-section {
    grid-template-columns: 1fr;
  }

  .metric-grid,
  .event-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .flow-grid {
    grid-template-columns: 1fr;
  }

  .flow-step {
    min-height: 280px;
  }

  .flow-step > div {
    margin-bottom: 70px;
  }

  .measurement-intro ul {
    max-width: 520px;
  }
}

@media (max-width: 680px) {
  :root {
    --collab-pad: 18px;
  }

  .collab-hero {
    min-height: 670px;
  }

  .collab-hero__meta {
    display: grid;
  }

  .collab-hero h1 {
    font-size: clamp(50px, 16vw, 76px);
    line-height: 0.88;
  }

  .collab-actions,
  .button {
    width: 100%;
  }

  .metric-grid,
  .offer-grid,
  .event-grid,
  .measurement-boundary {
    grid-template-columns: 1fr;
  }

  .metric-card {
    min-height: 154px;
  }

  .offer-card {
    min-height: 280px;
  }

  .guide-proof {
    grid-template-columns: 1fr;
    gap: 22px;
  }

  .collab-footer {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .button {
    transition: none;
  }
}