:root {
  --sky: #4da3ff;
  --sky-deep: #2f8fff;
  --sky-soft: #8ec8ff;
  --sky-mist: #d7ebff;
  --ink: #13233f;
  --ink-soft: #4a5b78;
  --muted: #64748b;
  --line: #e8eef5;
  --canvas: #f3f8fe;
  --white: #ffffff;
  --dark: #0c1424;
  --dark-2: #121c31;
  --dark-3: #1a2740;
  --protect: #22c55e;
  --radius: 24px;
  --shadow: 0 20px 50px rgba(47, 100, 170, 0.16);
  --font: "Pretendard", "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;
  --nav-h: 68px;
  --max: 1120px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 12px);
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--canvas);
  line-height: 1.55;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

button {
  font: inherit;
}

.section-shell {
  width: min(100% - 40px, var(--max));
  margin: 0 auto;
}

.section-shell--narrow {
  width: min(100% - 40px, 760px);
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--sky-deep);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-size: 0.75rem;
}

.eyebrow--on-dark {
  color: var(--sky-soft);
}

.lead {
  margin: 0;
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 36rem;
}

.section-head {
  max-width: 640px;
  margin: 0 auto 40px;
  text-align: center;
}

.section-head h2 {
  margin: 0 0 12px;
  font-size: clamp(1.85rem, 3.4vw, 2.55rem);
  letter-spacing: -0.04em;
  line-height: 1.18;
}

.section-head p {
  margin: 0;
  color: var(--muted);
}

/* ---------- Nav ---------- */
.nav-shell {
  position: sticky;
  top: 0;
  z-index: 100;
  width: 100%;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  background: rgba(243, 248, 254, 0.82);
  border-bottom: 1px solid transparent;
  transition: background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.nav-shell.is-scrolled,
.nav-shell.is-open {
  background: rgba(255, 255, 255, 0.96);
  border-bottom-color: rgba(232, 238, 245, 0.95);
  box-shadow: 0 8px 24px rgba(19, 35, 63, 0.04);
}

.nav {
  width: min(100% - 32px, var(--max));
  margin: 0 auto;
  min-height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.nav__brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
  flex-shrink: 0;
}

.nav__brand img {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  box-shadow: 0 6px 16px rgba(77, 163, 255, 0.22);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav__links a {
  padding: 8px 12px;
  border-radius: 999px;
  color: var(--ink-soft);
  font-size: 0.94rem;
  font-weight: 600;
  transition: color 0.15s ease, background 0.15s ease;
}

.nav__links a:hover {
  color: var(--ink);
  background: rgba(77, 163, 255, 0.08);
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.nav__menu {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.8);
  padding: 0;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  cursor: pointer;
}

.nav__menu span {
  display: block;
  width: 16px;
  height: 2px;
  border-radius: 2px;
  background: var(--ink);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-shell.is-open .nav__menu span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-shell.is-open .nav__menu span:nth-child(2) {
  opacity: 0;
}

.nav-shell.is-open .nav__menu span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.95rem;
  border: 1px solid transparent;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  white-space: nowrap;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn--sm {
  min-height: 40px;
  padding: 0 16px;
  font-size: 0.88rem;
}

.btn--primary {
  background: linear-gradient(180deg, #63b0ff, var(--sky-deep));
  color: #fff;
  box-shadow: 0 12px 28px rgba(47, 143, 255, 0.32);
}

.btn--ghost {
  background: rgba(255, 255, 255, 0.78);
  border-color: #d7e6f5;
  color: var(--ink);
}

.btn--on-dark {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.22);
  color: #fff;
}

.btn--disabled {
  opacity: 0.7;
  cursor: default;
  pointer-events: none;
  transform: none !important;
  box-shadow: none;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(900px 420px at 80% 10%, rgba(142, 200, 255, 0.45), transparent 60%),
    radial-gradient(700px 380px at 10% 90%, rgba(176, 214, 242, 0.5), transparent 55%),
    linear-gradient(180deg, #e8f4ff 0%, #f3f8fe 55%, #ffffff 100%);
}

.hero__inner {
  width: min(100% - 40px, var(--max));
  margin: 0 auto;
  padding: 48px 0 72px;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(280px, 0.9fr);
  gap: 48px;
  align-items: center;
  min-height: calc(100svh - var(--nav-h));
}

.brand-hero {
  display: block;
  font-size: clamp(3.2rem, 6.5vw, 5rem);
  line-height: 0.96;
  letter-spacing: -0.06em;
  font-weight: 800;
  color: var(--ink);
  margin-bottom: 10px;
}

.hero h1 {
  margin: 0;
  font-size: clamp(1.9rem, 3.8vw, 2.85rem);
  line-height: 1.15;
  letter-spacing: -0.04em;
  color: var(--ink);
}

.hero__line {
  display: block;
}

.hero__sub {
  margin: 18px 0 26px;
  max-width: 32rem;
  color: var(--ink-soft);
  font-size: 1.06rem;
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero__points {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.hero__points li {
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(215, 230, 245, 0.95);
  color: var(--ink-soft);
  font-size: 0.84rem;
  font-weight: 600;
}

.hero__visual {
  display: flex;
  justify-content: center;
}

.phone {
  width: min(100%, 320px);
  filter: drop-shadow(0 28px 50px rgba(19, 35, 63, 0.22));
}

.phone__bezel {
  border-radius: 36px;
  padding: 12px;
  background: linear-gradient(160deg, #24324c, #101827);
}

.phone__island {
  width: 96px;
  height: 10px;
  margin: 2px auto 12px;
  border-radius: 999px;
  background: #070b14;
}

.phone__screen {
  border-radius: 26px;
  padding: 18px 16px 20px;
  background: linear-gradient(180deg, #dceeff 0%, #eef6ff 42%, #f7fbfe 100%);
  text-align: center;
  color: var(--ink);
}

.phone__top {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 0.9rem;
}

.phone__top img {
  width: 28px;
  height: 28px;
  border-radius: 8px;
}

.phone__pill {
  display: inline-block;
  margin: 18px 0 8px;
  padding: 5px 12px;
  border-radius: 999px;
  background: #e8f9ef;
  color: #15803d;
  font-size: 0.74rem;
  font-weight: 700;
}

.phone__status {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.phone__support {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.phone__cloud {
  margin: 22px auto 8px;
  width: 132px;
  height: 132px;
  padding: 0;
  border: 0;
  background: transparent;
  border-radius: 32px;
  animation: floaty 4.8s ease-in-out infinite;
}

.phone__cloud img {
  width: 132px;
  height: 132px;
  border-radius: 32px;
  box-shadow: 0 14px 28px rgba(77, 163, 255, 0.28);
}

.phone__metrics {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: 16px;
}

.phone__metrics div {
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid #e8f0fa;
  border-radius: 14px;
  padding: 10px 8px;
}

.phone__metrics span {
  display: block;
  font-size: 0.68rem;
  color: var(--muted);
  margin-bottom: 2px;
}

.phone__metrics strong {
  font-size: 0.86rem;
}

/* ---------- Features ---------- */
.features {
  padding: 96px 0;
  background:
    radial-gradient(700px 360px at 15% 0%, rgba(77, 163, 255, 0.2), transparent 60%),
    radial-gradient(560px 300px at 90% 40%, rgba(34, 197, 94, 0.08), transparent 55%),
    linear-gradient(180deg, #0c1424 0%, #101a2d 100%);
  color: #edf3ff;
}

.features .section-head p {
  color: #9fb0c9;
}

.bento {
  display: grid;
  grid-template-columns: 1.35fr 1fr 1fr;
  gap: 16px;
}

.bento__card {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius);
  padding: 24px;
  overflow: hidden;
  min-height: 220px;
}

.bento__card--lg {
  grid-row: span 2;
  min-height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: linear-gradient(180deg, rgba(77, 163, 255, 0.16), rgba(255, 255, 255, 0.03));
}

.bento__card--wide {
  grid-column: 2 / span 2;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 18px;
  align-items: center;
  min-height: auto;
}

.bento__text h3 {
  margin: 0 0 8px;
  font-size: 1.22rem;
  letter-spacing: -0.03em;
}

.bento__text p {
  margin: 0;
  color: #a8b8d0;
}

.bento__visual {
  display: grid;
  place-items: center;
  padding: 28px 0 4px;
}

.bento__visual img {
  width: 148px;
  height: 148px;
  border-radius: 34px;
  box-shadow: 0 18px 36px rgba(0, 0, 0, 0.3);
  animation: floaty 4.5s ease-in-out infinite;
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 28px;
}

.chip-row span {
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(77, 163, 255, 0.14);
  border: 1px solid rgba(142, 200, 255, 0.25);
  font-size: 0.82rem;
  font-weight: 600;
}

.split-viz {
  display: grid;
  gap: 10px;
  margin-top: 34px;
}

.split-viz .bar {
  height: 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
}

.split-viz .bar--accent {
  width: 68%;
  background: linear-gradient(90deg, var(--sky), var(--protect));
}

.checklist {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.checklist li {
  padding: 10px 12px;
  border-radius: 14px;
  background: rgba(34, 197, 94, 0.1);
  border: 1px solid rgba(34, 197, 94, 0.22);
  font-size: 0.9rem;
}

/* ---------- How ---------- */
.how {
  padding: 96px 0;
  background: linear-gradient(180deg, #ffffff 0%, #f7fbfe 100%);
}

.how__grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 48px;
  align-items: start;
}

.how__copy h2 {
  margin: 0 0 14px;
  font-size: clamp(1.85rem, 3.2vw, 2.5rem);
  letter-spacing: -0.04em;
  line-height: 1.18;
}

.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.steps li {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 14px;
  align-items: start;
  padding: 18px 18px 18px 16px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid var(--line);
  box-shadow: 0 10px 28px rgba(77, 163, 255, 0.06);
}

.steps__num {
  width: 48px;
  height: 48px;
  border-radius: 16px;
  display: grid;
  place-items: center;
  background: linear-gradient(180deg, #63b0ff, var(--sky-deep));
  color: #fff;
  font-weight: 800;
  font-size: 1.05rem;
}

.steps strong {
  display: block;
  margin-bottom: 4px;
  letter-spacing: -0.02em;
}

.steps p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

/* ---------- Privacy ---------- */
.privacy {
  padding: 96px 0;
  background:
    radial-gradient(600px 280px at 85% 20%, rgba(142, 200, 255, 0.28), transparent 60%),
    linear-gradient(180deg, #eaf4ff 0%, #f5f9fd 100%);
}

.privacy__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.privacy__copy h2 {
  margin: 0 0 14px;
  font-size: clamp(1.85rem, 3.2vw, 2.5rem);
  letter-spacing: -0.04em;
  line-height: 1.18;
}

.plain-list {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.plain-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  color: var(--ink-soft);
}

.plain-list li::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--sky);
  flex-shrink: 0;
}

.privacy__panel {
  display: grid;
  gap: 14px;
}

.privacy__card {
  border-radius: 28px;
  padding: 28px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.privacy__card img {
  width: 88px;
  height: 88px;
  border-radius: 22px;
  margin-bottom: 16px;
  box-shadow: 0 12px 24px rgba(77, 163, 255, 0.2);
}

.privacy__card h3 {
  margin: 0 0 8px;
  font-size: 1.2rem;
  letter-spacing: -0.03em;
}

.privacy__card p {
  margin: 0;
  color: var(--muted);
}

.privacy__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.privacy__stats div {
  border-radius: 18px;
  padding: 16px 12px;
  text-align: center;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
}

.privacy__stats strong {
  display: block;
  font-size: 1.45rem;
  letter-spacing: -0.04em;
  color: var(--sky-deep);
}

.privacy__stats span {
  display: block;
  margin-top: 4px;
  font-size: 0.78rem;
  color: var(--muted);
  font-weight: 600;
}

/* ---------- Values ---------- */
.values {
  padding: 88px 0;
  background: #ffffff;
}

.value-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.value {
  margin: 0;
  padding: 24px;
  border-radius: 22px;
  background: #f7fbfe;
  border: 1px solid var(--line);
}

.value h3 {
  margin: 0 0 10px;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
}

.value p {
  margin: 0;
  color: var(--muted);
  font-size: 0.96rem;
}

/* ---------- FAQ ---------- */
.faq {
  padding: 24px 0 96px;
  background: #ffffff;
}

.faq__list {
  display: grid;
  gap: 12px;
}

details {
  border-radius: 18px;
  background: #f7fbfe;
  border: 1px solid var(--line);
  padding: 4px 18px;
}

summary {
  cursor: pointer;
  list-style: none;
  padding: 16px 28px 16px 0;
  font-weight: 700;
  letter-spacing: -0.02em;
  position: relative;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
  font-size: 1.2rem;
  font-weight: 500;
}

details[open] summary::after {
  content: "–";
}

details p {
  margin: 0 0 16px;
  color: var(--muted);
}

/* ---------- CTA ---------- */
.cta {
  padding: 88px 0;
  text-align: center;
  color: #edf3ff;
  background:
    radial-gradient(600px 280px at 50% 0%, rgba(77, 163, 255, 0.22), transparent 65%),
    linear-gradient(180deg, #0c1424 0%, #101a2d 100%);
}

.cta__inner {
  max-width: 680px;
}

.cta__icon {
  margin: 0 auto 18px;
  width: 72px;
  height: 72px;
  border-radius: 20px;
  box-shadow: 0 18px 36px rgba(0, 0, 0, 0.28);
}

.cta h2 {
  margin: 0 0 10px;
  font-size: clamp(1.8rem, 3.4vw, 2.5rem);
  letter-spacing: -0.04em;
}

.cta p {
  margin: 0 0 26px;
  color: #9fb0c9;
}

.cta .hero__cta {
  justify-content: center;
}

/* ---------- Footer ---------- */
.footer-shell {
  background: #ffffff;
  border-top: 1px solid var(--line);
}

.footer {
  width: min(100% - 40px, var(--max));
  margin: 0 auto;
  padding: 48px 0 36px;
  display: grid;
  grid-template-columns: 1.1fr 2fr;
  gap: 28px;
}

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

.footer__brand img {
  width: 40px;
  height: 40px;
  border-radius: 12px;
}

.footer__brand strong {
  display: block;
  font-size: 1.1rem;
}

.footer__brand span {
  color: var(--muted);
  font-size: 0.85rem;
}

.footer__cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.footer__cols h4 {
  margin: 0 0 10px;
  font-size: 0.82rem;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.footer__cols a {
  display: block;
  margin-bottom: 8px;
  color: var(--ink-soft);
  font-weight: 500;
}

.footer__cols a:hover {
  color: var(--sky-deep);
}

.footer__copy {
  grid-column: 1 / -1;
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--line);
  padding-top: 18px;
}

/* ---------- Motion ---------- */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.65s ease, transform 0.65s ease;
  transition-delay: var(--delay, 0ms);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

@keyframes floaty {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-8px);
  }
}

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

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .phone__cloud,
  .bento__visual img {
    animation: none;
  }
}

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
  .nav__menu {
    display: inline-flex;
  }

  .nav__links {
    position: absolute;
    top: calc(var(--nav-h) + 1px);
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 12px 16px 16px;
    background: #ffffff;
    border-bottom: 1px solid var(--line);
    box-shadow: 0 16px 30px rgba(19, 35, 63, 0.1);
  }

  .nav-shell.is-open .nav__links {
    display: flex;
  }

  .nav__links a {
    padding: 12px 14px;
  }

  .hero__inner,
  .how__grid,
  .privacy__grid,
  .bento,
  .value-grid,
  .footer {
    grid-template-columns: 1fr;
  }

  .hero__inner {
    min-height: auto;
    padding: 28px 0 56px;
    gap: 36px;
  }

  .hero__visual {
    order: -1;
  }

  .phone {
    width: min(100%, 280px);
  }

  .bento__card--lg {
    grid-row: auto;
    min-height: 280px;
  }

  .bento__card--wide {
    grid-column: auto;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 16px;
  }

  .privacy__stats {
    grid-template-columns: repeat(3, 1fr);
  }

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

@media (max-width: 560px) {
  :root {
    --nav-h: 60px;
  }

  .section-shell,
  .hero__inner,
  .footer {
    width: min(100% - 28px, var(--max));
  }

  .nav {
    width: min(100% - 24px, var(--max));
  }

  .nav__actions .btn--sm {
    display: none;
  }

  .hero__points {
    gap: 6px;
  }

  .hero__points li {
    font-size: 0.78rem;
    padding: 7px 10px;
  }

  .features,
  .how,
  .privacy,
  .values,
  .cta {
    padding: 72px 0;
  }

  .faq {
    padding: 8px 0 72px;
  }

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

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

  .cta .hero__cta {
    flex-direction: column;
    align-items: stretch;
  }

  .cta .btn {
    width: 100%;
  }
}