:root {
  --ink: #4b3d33;
  --muted: #776d64;
  --paper: #fffdf8;
  --paper-soft: #f8f3ea;
  --line: rgba(111, 94, 74, 0.16);
  --blue: #8bb8d8;
  --blue-deep: #5e8fb3;
  --green: #9fad7c;
  --green-soft: #e8edda;
  --gold: #e9ca75;
  --rose: #e7c9bc;
  --shadow: 0 24px 70px rgba(75, 61, 51, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  font-family: "IBM Plex Sans KR", sans-serif;
  background:
    radial-gradient(circle at 15% 16%, rgba(255, 255, 255, 0.92), transparent 30rem),
    radial-gradient(circle at 78% 4%, rgba(139, 184, 216, 0.12), transparent 28rem),
    linear-gradient(135deg, #fffefd 0%, #fbf8f1 58%, #f5fbfd 100%);
  overflow-x: hidden;
}

a {
  color: inherit;
}

.paper-grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.32;
  background-image:
    radial-gradient(rgba(111, 94, 74, 0.055) 0.7px, transparent 0.7px),
    linear-gradient(rgba(139, 184, 216, 0.038) 1px, transparent 1px);
  background-position: 0 0, 0 0;
  background-size: 18px 18px, 42px 42px;
  mask-image: radial-gradient(circle at center, black, transparent 86%);
}

.morning-glow {
  position: fixed;
  width: 25rem;
  height: 25rem;
  border-radius: 999px;
  filter: blur(20px);
  pointer-events: none;
  opacity: 0.34;
}

.glow-one {
  right: -9rem;
  top: 16rem;
  background: rgba(139, 184, 216, 0.34);
}

.glow-two {
  left: -9rem;
  bottom: 0;
  background: rgba(210, 221, 189, 0.42);
}

.invite-shell {
  position: relative;
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 30px 0 62px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 10px 0 58px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  font-family: "Gowun Batang", serif;
  font-size: 2rem;
  font-weight: 700;
  color: var(--blue-deep);
}

.brand img {
  border-radius: 14px;
  box-shadow: 0 10px 22px rgba(94, 143, 179, 0.16);
}

.brand small {
  display: block;
  margin-top: -2px;
  color: var(--muted);
  font-family: "IBM Plex Sans KR", sans-serif;
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.01em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(16px, 3vw, 42px);
  font-size: 0.98rem;
  font-weight: 700;
}

.nav-links a {
  text-decoration: none;
}

.text-link {
  padding: 10px 16px;
  border: 1px solid rgba(94, 143, 179, 0.45);
  border-radius: 10px;
  color: var(--blue-deep);
  background: rgba(255, 250, 242, 0.74);
  backdrop-filter: blur(16px);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(420px, 1.08fr);
  align-items: center;
  gap: clamp(34px, 6vw, 78px);
  min-height: 610px;
}

.hero-copy {
  animation: rise 720ms ease both;
}

.eyebrow {
  position: relative;
  margin: 0 0 24px;
  padding-left: 28px;
  color: var(--ink);
  font-family: "Gowun Batang", serif;
  font-size: 1.08rem;
}

.eyebrow::before {
  content: "⌁";
  position: absolute;
  left: 0;
  top: -2px;
  color: var(--green);
  font-size: 1.4rem;
}

h1 {
  margin: 0;
  font-family: "Gowun Batang", "IBM Plex Sans KR", serif;
  max-width: 34rem;
  font-size: clamp(3rem, 5vw, 4.7rem);
  font-weight: 700;
  line-height: 1.14;
  letter-spacing: -0.055em;
  word-break: keep-all;
}

h1 em {
  color: var(--blue-deep);
  font-style: normal;
  white-space: nowrap;
}

.lead {
  max-width: 31rem;
  margin: 26px 0 0;
  color: var(--muted);
  font-size: 1.08rem;
  line-height: 1.82;
  word-break: keep-all;
}

.store-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.store-button {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 174px;
  min-height: 58px;
  padding: 10px 18px;
  border: 0;
  border-radius: 8px;
  color: #fff;
  background: #141414;
  box-shadow: 0 12px 28px rgba(20, 20, 20, 0.16);
  text-decoration: none;
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.store-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 34px rgba(20, 20, 20, 0.2);
}

.store-button.is-disabled {
  opacity: 0.48;
  cursor: not-allowed;
}

.store-button.is-disabled:hover {
  transform: none;
}

.store-mark {
  font-size: 1.7rem;
  line-height: 1;
}

.store-button small,
.store-button strong {
  display: block;
}

.store-button small {
  opacity: 0.84;
  font-size: 0.78rem;
  font-weight: 600;
}

.store-button strong {
  margin-top: 1px;
  font-size: 0.96rem;
  font-weight: 700;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.invite-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 4px 18px;
  align-items: center;
  width: min(100%, 440px);
  margin-top: 46px;
  padding: 18px 20px;
  border: 1px solid rgba(174, 138, 91, 0.28);
  border-radius: 22px;
  background:
    radial-gradient(circle at 95% 10%, rgba(159, 173, 124, 0.22), transparent 6rem),
    rgba(255, 250, 242, 0.76);
  box-shadow: 0 16px 44px rgba(75, 61, 51, 0.1);
}

.invite-card[hidden] {
  display: none;
}

.invite-card::before {
  content: "◎";
  display: grid;
  place-items: center;
  grid-row: 1 / 4;
  width: 58px;
  height: 58px;
  border-radius: 999px;
  color: var(--blue-deep);
  background: rgba(139, 184, 216, 0.22);
  font-size: 1.7rem;
}

.invite-card span {
  color: var(--muted);
  font-size: 0.92rem;
}

.invite-card strong {
  font-family: "Gowun Batang", serif;
  font-size: 1.8rem;
  letter-spacing: -0.03em;
}

.invite-card p {
  grid-column: 2 / 4;
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.copy-button {
  grid-row: 1 / 3;
  grid-column: 3;
  border: 1px solid rgba(75, 61, 51, 0.2);
  border-radius: 8px;
  padding: 10px 14px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.68);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.hero-visual {
  position: relative;
  min-height: 0;
  animation: floatIn 900ms 120ms ease both;
}

.hero-feature-graphic {
  display: block;
  width: 100%;
  max-width: 640px;
  height: auto;
  margin-left: auto;
  border-radius: 18px;
  box-shadow: 0 24px 70px rgba(75, 61, 51, 0.16);
}

.feature-intro {
  margin-top: 56px;
  text-align: center;
}

.feature-intro p {
  margin: 0;
  color: var(--muted);
  font-family: "Gowun Batang", serif;
  font-size: 1.8rem;
  font-weight: 700;
}

.feature-intro h2 {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 1.02rem;
  font-weight: 500;
}

.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 42px;
  margin-top: 46px;
}

.features article {
  min-height: 250px;
  padding: 30px 26px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.58), rgba(255, 250, 242, 0.72)),
    radial-gradient(circle at 50% 100%, rgba(159, 173, 124, 0.22), transparent 9rem);
  text-align: center;
  box-shadow: 0 16px 44px rgba(75, 61, 51, 0.08);
}

.features article:nth-child(2) {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.58), rgba(255, 250, 242, 0.72)),
    radial-gradient(circle at 50% 100%, rgba(139, 184, 216, 0.24), transparent 9rem);
}

.features article:nth-child(3) {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.58), rgba(255, 250, 242, 0.72)),
    radial-gradient(circle at 50% 100%, rgba(233, 202, 117, 0.24), transparent 9rem);
}

.features span {
  display: grid;
  place-items: center;
  width: 72px;
  height: 72px;
  margin: 0 auto 22px;
  border-radius: 999px;
  color: var(--ink);
  background: var(--green-soft);
  font-size: 2rem;
}

.features article:nth-child(2) span {
  background: rgba(139, 184, 216, 0.34);
}

.features article:nth-child(3) span {
  background: rgba(233, 202, 117, 0.42);
}

.features h2 {
  margin: 0 0 12px;
  font-family: "Gowun Batang", serif;
  font-size: 1.22rem;
}

.features p {
  margin: 0;
  color: var(--muted);
  line-height: 1.72;
  word-break: keep-all;
}

.how-it-works {
  margin-top: 76px;
  text-align: center;
}

.how-it-works h2 {
  margin: 0 0 34px;
  font-family: "Gowun Batang", serif;
  font-size: 1.7rem;
}

.how-it-works > div {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
}

.how-it-works article {
  position: relative;
  padding: 0 14px;
}

.how-it-works article:not(:last-child)::after {
  content: "→";
  position: absolute;
  right: -20px;
  top: 30px;
  color: rgba(111, 94, 74, 0.32);
}

.how-it-works span {
  display: grid;
  place-items: center;
  width: 74px;
  height: 74px;
  margin: 0 auto 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: #6c7b44;
  background: rgba(232, 237, 218, 0.78);
  font-size: 1.9rem;
}

.how-it-works strong {
  display: block;
  margin-bottom: 8px;
  font-family: "Gowun Batang", serif;
  font-size: 1.08rem;
}

.how-it-works p {
  margin: 0;
  color: var(--muted);
  line-height: 1.65;
  word-break: keep-all;
}

.support-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-top: 70px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.96rem;
}

.support-links p {
  flex-basis: 100%;
  margin: 0;
  color: var(--ink);
  font-family: "Gowun Batang", serif;
  font-size: 1.18rem;
  font-weight: 700;
  text-align: center;
}

.support-links a {
  color: var(--blue-deep);
  font-weight: 700;
  text-decoration: none;
}

.support-links a:hover {
  text-decoration: underline;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes floatIn {
  from {
    opacity: 0;
    transform: translateY(24px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@media (max-width: 900px) {
  .invite-shell {
    width: min(100% - 28px, 680px);
    padding-top: 18px;
  }

  .topbar {
    align-items: flex-start;
    padding-bottom: 28px;
  }

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

  .nav-links .text-link {
    display: none;
  }

  .hero {
    grid-template-columns: 1fr;
    min-height: 0;
  }

  .hero-visual {
    order: -1;
    min-height: 0;
    overflow: visible;
  }

  .hero-feature-graphic {
    max-width: 100%;
    margin: 0 auto;
    border-radius: 14px;
  }

  h1 {
    max-width: 22rem;
    font-size: clamp(2.5rem, 10.2vw, 3.2rem);
    line-height: 1.18;
    letter-spacing: -0.06em;
  }

  .lead {
    word-break: keep-all;
    overflow-wrap: normal;
  }

  .store-actions {
    display: grid;
    grid-template-columns: 1fr;
  }

  .store-button {
    width: min(100%, 290px);
  }

  .invite-card {
    grid-template-columns: auto 1fr;
    margin-top: 30px;
  }

  .copy-button {
    grid-row: auto;
    grid-column: 2;
    width: fit-content;
  }

  .invite-card p {
    grid-column: 1 / 3;
  }

  .features,
  .how-it-works > div {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .how-it-works article:not(:last-child)::after {
    display: none;
  }
}

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