:root {
  color-scheme: light;
  --bg: #f7f6f2;
  --surface: #ffffff;
  --surface-soft: #fbfaf7;
  --ink: #171615;
  --muted: #68625a;
  --line: #dedad2;
  --line-strong: #c8c2b7;
  --accent: #0f7b68;
  --accent-strong: #075a4b;
  --accent-soft: #e7f2ef;
  --warning: #f3efe4;
  --shadow: 0 18px 45px rgba(23, 22, 21, 0.08);
  --max: 1120px;
  --radius: 8px;
  --radius-small: 6px;
  --header-height: 72px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Noto Sans KR", "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  letter-spacing: 0;
  word-break: keep-all;
  overflow-wrap: anywhere;
}

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

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 3px solid rgba(15, 123, 104, 0.35);
  outline-offset: 4px;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: 16px;
  z-index: 100;
  padding: 10px 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-small);
  background: var(--surface);
  transform: translateY(-140%);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  min-height: var(--header-height);
  border-bottom: 1px solid rgba(222, 218, 210, 0.88);
  background: rgba(247, 246, 242, 0.94);
  backdrop-filter: blur(14px);
}

.nav-wrap {
  width: min(100% - 40px, var(--max));
  min-height: var(--header-height);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 750;
  text-decoration: none;
  white-space: nowrap;
}

.brand-logo {
  width: 30px;
  height: 30px;
  border-radius: 7px;
  border: 1px solid rgba(23, 22, 21, 0.12);
  box-shadow: 0 1px 2px rgba(23, 22, 21, 0.1);
}

.top-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 2px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.top-nav::-webkit-scrollbar {
  display: none;
}

.top-nav a {
  min-height: 44px;
  padding: 11px 12px;
  border-radius: var(--radius-small);
  color: var(--muted);
  font-size: 14px;
  font-weight: 650;
  text-decoration: none;
  white-space: nowrap;
}

.top-nav a:hover {
  background: var(--surface);
  color: var(--ink);
}

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

.hero {
  min-height: calc(100svh - var(--header-height));
  padding: 56px 0 48px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 430px);
  align-items: center;
  gap: clamp(36px, 6vw, 72px);
  border-bottom: 1px solid var(--line);
}

.hero-copy {
  max-width: 720px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent-strong);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
}

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

h1 {
  max-width: 780px;
  margin-bottom: 20px;
  font-size: clamp(40px, 7vw, 78px);
  line-height: 1.03;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 14px;
  font-size: clamp(28px, 4.2vw, 48px);
  line-height: 1.12;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 8px;
  font-size: 20px;
  line-height: 1.35;
  letter-spacing: 0;
}

.lead {
  max-width: 650px;
  margin-bottom: 26px;
  color: #3d3934;
  font-size: clamp(18px, 2.2vw, 22px);
  line-height: 1.65;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 28px;
}

.button {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 16px;
  border: 1px solid var(--ink);
  border-radius: var(--radius-small);
  font-weight: 750;
  text-decoration: none;
}

.button.primary {
  background: var(--ink);
  color: var(--surface);
}

.button.secondary {
  background: var(--surface);
  color: var(--ink);
}

.quick-facts {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.quick-facts div {
  padding: 16px 14px 16px 0;
}

.quick-facts div + div {
  padding-left: 16px;
  border-left: 1px solid var(--line);
}

.quick-facts dt {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.quick-facts dd {
  margin: 3px 0 0;
  font-weight: 760;
  line-height: 1.45;
}

.hero-visual,
.screenshot-panel {
  margin: 0;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.hero-visual {
  justify-self: end;
  width: min(100%, 390px);
}

.hero-visual img,
.screenshot-panel img {
  width: 100%;
}

figcaption {
  border-top: 1px solid var(--line);
  padding: 12px 14px;
  background: var(--surface-soft);
  color: var(--muted);
  font-size: 14px;
  line-height: 1.45;
}

.section {
  padding: 88px 0;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: calc(var(--header-height) + 18px);
}

.section-tight {
  padding-top: 72px;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 32px;
}

.section-heading p:not(.eyebrow) {
  color: #3d3934;
  font-size: 18px;
}

.text-grid,
.requirements,
.detail-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.plain-panel,
.requirements article,
.detail-list > div {
  min-height: 100%;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.plain-panel p,
.requirements p,
.detail-list p {
  margin-bottom: 0;
  color: #3d3934;
}

.check-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  position: relative;
  padding: 10px 0 10px 24px;
  border-top: 1px solid var(--line);
  color: #312e2a;
}

.check-list li:first-child {
  border-top: 0;
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  width: 8px;
  height: 8px;
  border: 2px solid var(--accent);
  border-radius: 50%;
}

.note {
  margin-top: 18px;
  padding: 18px 20px;
  border: 1px solid #d8cfbc;
  border-radius: var(--radius);
  background: var(--warning);
  display: grid;
  grid-template-columns: 210px minmax(0, 1fr);
  gap: 18px;
  color: #3d3934;
}

.note strong {
  color: var(--ink);
}

.step-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 28px;
}

.step-list > li {
  display: grid;
  grid-template-columns: minmax(240px, 0.72fr) minmax(260px, 390px);
  align-items: start;
  gap: clamp(24px, 5vw, 58px);
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.step-list > li:first-child {
  padding-top: 0;
  border-top: 0;
}

.step-list p,
.instruction-block p,
.compact-steps,
.trouble-list p {
  color: #3d3934;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 390px);
  align-items: start;
  gap: clamp(28px, 5vw, 58px);
}

.instruction-block {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.compact-steps {
  margin: 0;
  padding-left: 20px;
}

.compact-steps li {
  padding: 8px 0;
}

.body-note {
  margin: 18px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.gallery {
  display: grid;
  gap: 18px;
}

.gallery.two-up {
  grid-template-columns: repeat(2, minmax(260px, 390px));
}

.detail-list {
  margin-top: 20px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.usage-flow {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.usage-card {
  margin: 0;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--surface);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.usage-shot {
  aspect-ratio: 9 / 14;
  overflow: hidden;
  background: #edeae3;
}

.usage-shot img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 73%;
}

.usage-card figcaption {
  min-height: 94px;
}

.usage-card strong {
  display: block;
  margin-bottom: 3px;
  color: var(--ink);
  font-size: 15px;
}

.trouble-list {
  display: grid;
  gap: 10px;
}

details {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

summary {
  min-height: 54px;
  padding: 14px 18px;
  cursor: pointer;
  font-weight: 760;
}

details p {
  margin: 0;
  padding: 0 18px 18px;
}

.sources {
  border-bottom: 0;
}

.source-list {
  margin: 0;
  padding-left: 20px;
  color: #3d3934;
}

.source-list li {
  padding: 6px 0;
}

.source-list a {
  color: var(--accent-strong);
  font-weight: 760;
}

.site-footer {
  width: min(100% - 40px, var(--max));
  margin: 0 auto;
  padding: 28px 0 44px;
  border-top: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  color: var(--muted);
  font-size: 14px;
}

.site-footer p {
  margin-bottom: 0;
}

.site-footer a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  font-weight: 750;
}

@media (max-width: 980px) {
  .nav-wrap {
    width: min(100% - 28px, var(--max));
    align-items: flex-start;
    flex-direction: column;
    gap: 4px;
    padding: 10px 0;
  }

  :root {
    --header-height: 116px;
  }

  .top-nav {
    width: 100%;
    justify-content: flex-start;
    padding-bottom: 2px;
  }

  main,
  .site-footer {
    width: min(100% - 28px, var(--max));
  }

  .hero {
    min-height: auto;
    grid-template-columns: 1fr;
    padding-top: 42px;
  }

  .hero-visual {
    justify-self: start;
    width: min(100%, 420px);
  }

  .quick-facts,
  .text-grid,
  .requirements,
  .usage-flow {
    grid-template-columns: 1fr;
  }

  .quick-facts div {
    padding: 14px 0;
  }

  .quick-facts div + div {
    padding-left: 0;
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .step-list > li,
  .split {
    grid-template-columns: 1fr;
  }

  .gallery.two-up,
  .detail-list {
    grid-template-columns: 1fr;
  }

  .note {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}

@media (max-width: 620px) {
  body {
    word-break: normal;
  }

  h1 {
    font-size: 40px;
  }

  h2 {
    font-size: 30px;
  }

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

  .button {
    width: 100%;
  }

  .section {
    padding: 64px 0;
  }

  .plain-panel,
  .requirements article,
  .detail-list > div,
  .instruction-block {
    padding: 18px;
  }

  .usage-shot {
    aspect-ratio: 9 / 13;
  }

  .site-footer {
    align-items: flex-start;
    flex-direction: column;
  }
}

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