:root {
  --ink: #18201d;
  --muted: #59645f;
  --paper: #f5f7f5;
  --surface: #ffffff;
  --line: #d8dfdb;
  --green: #18794e;
  --green-dark: #0f5c3a;
  --blue: #1769aa;
  --blue-soft: #e8f3fb;
  --red: #c93635;
  --red-dark: #7a1d1d;
  --yellow: #f5c451;
  --max: 1120px;
}
* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Pretendard, -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;
  font-size: 18px;
  line-height: 1.65;
  letter-spacing: 0;
}

a {
  color: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  padding: 10px max(20px, calc((100vw - var(--max)) / 2));
  border-bottom: 1px solid var(--line);
  background: rgb(255 255 255 / 94%);
  backdrop-filter: blur(12px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 800;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  border-radius: 6px;
  color: white;
  background: var(--green);
}

.help-link {
  color: var(--red-dark);
  font-size: 15px;
  font-weight: 800;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.intro,
.steps,
.faq,
.finish {
  width: min(var(--max), calc(100% - 40px));
  margin-inline: auto;
}

.intro {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(440px, 1.1fr);
  align-items: center;
  gap: 64px;
  min-height: calc(100vh - 68px);
  padding: 72px 0;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--green);
  font-size: 16px;
  font-weight: 850;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  margin: 0;
  font-size: clamp(44px, 6vw, 72px);
  line-height: 1.14;
}

.lead {
  max-width: 620px;
  margin: 28px 0 34px;
  color: var(--muted);
  font-size: 21px;
}

.primary-link {
  display: inline-flex;
  min-height: 56px;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border-radius: 6px;
  color: white;
  background: var(--green);
  font-weight: 850;
  text-decoration: none;
}

.primary-link:hover,
.primary-link:focus-visible {
  background: var(--green-dark);
}

.screenshot {
  margin: 0;
}

.image-placeholder {
  display: grid;
  width: 100%;
  aspect-ratio: 5 / 3;
  place-content: center;
  gap: 6px;
  border: 2px dashed #98a59e;
  border-radius: 8px;
  color: #4c5a53;
  background:
    linear-gradient(135deg, rgb(255 255 255 / 70%), rgb(232 239 235 / 75%)),
    repeating-linear-gradient(45deg, transparent, transparent 14px, rgb(24 121 78 / 5%) 14px, rgb(24 121 78 / 5%) 28px);
  text-align: center;
}

.image-placeholder span {
  font-size: 28px;
  font-weight: 850;
}

.image-placeholder small {
  font-size: 14px;
}

.screenshot figcaption {
  margin-top: 10px;
  color: var(--muted);
  font-size: 14px;
}

.before-start {
  display: grid;
  grid-template-columns: 190px 1fr;
  gap: 24px;
  padding: 28px max(20px, calc((100vw - var(--max)) / 2));
  color: #3e2d02;
  background: var(--yellow);
}

.before-start strong {
  font-size: 21px;
}

.before-start ul {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin: 0;
  padding-left: 22px;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 48px;
}

.section-heading h2,
.finish h2 {
  margin: 0;
  font-size: clamp(34px, 5vw, 54px);
  line-height: 1.2;
}

.steps {
  padding: 110px 0 30px;
}

.step {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(430px, 1.1fr);
  align-items: center;
  gap: 72px;
  padding: 76px 0;
  border-top: 1px solid var(--line);
}

.step.reverse .step-copy {
  order: 2;
}

.step-number {
  display: grid;
  width: 52px;
  height: 52px;
  place-items: center;
  border-radius: 50%;
  color: white;
  background: var(--blue);
  font-size: 24px;
  font-weight: 900;
}

.step-kicker {
  margin: 22px 0 4px;
  color: var(--blue);
  font-size: 15px;
  font-weight: 850;
}

.step h3 {
  margin: 0 0 18px;
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.25;
}

.step-copy > p:not(.step-kicker, .tip) {
  color: var(--muted);
}

.tip {
  margin-top: 24px;
  padding: 18px 20px;
  border-left: 5px solid var(--blue);
  color: #19496b;
  background: var(--blue-soft);
}

.tip strong {
  display: block;
  margin-bottom: 3px;
}

.action-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 24px;
}

.action-pair div {
  min-height: 108px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.action-pair strong,
.action-pair span {
  display: block;
}

.action-pair span {
  margin-top: 8px;
  color: var(--muted);
  font-size: 15px;
}

.emergency {
  margin-top: 88px;
  padding: 100px max(20px, calc((100vw - var(--max)) / 2));
  color: white;
  background: #311f20;
}

.section-heading.light .eyebrow {
  color: #ff9c99;
}

.emergency-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(440px, 1.15fr);
  gap: 72px;
  width: min(var(--max), 100%);
  margin-inline: auto;
}

.emergency-copy ol {
  margin: 0 0 28px;
  padding-left: 28px;
  font-size: 22px;
  font-weight: 750;
}

.emergency-copy li + li {
  margin-top: 16px;
}

.emergency-copy p,
.dark-shot figcaption {
  color: #e6d9d9;
}

.dark-shot .image-placeholder {
  border-color: #a96d6c;
  color: #f2dddd;
  background: #171313;
}

.faq {
  padding: 110px 0;
}

.faq details {
  border-top: 1px solid var(--line);
  background: transparent;
}

.faq details:last-of-type {
  border-bottom: 1px solid var(--line);
}

.faq summary {
  padding: 24px 42px 24px 0;
  cursor: pointer;
  font-size: 21px;
  font-weight: 800;
}

.faq details p {
  max-width: 850px;
  margin: 0 0 28px;
  color: var(--muted);
}

.finish {
  padding: 68px;
  border-radius: 8px;
  color: white;
  background: var(--green-dark);
}

.finish .eyebrow {
  color: #bce8d1;
}

.finish p:not(.eyebrow) {
  margin: 18px 0 28px;
  color: #d8eee2;
}

.finish .primary-link {
  color: var(--green-dark);
  background: white;
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  width: min(var(--max), calc(100% - 40px));
  margin: 70px auto 0;
  padding: 30px 0 44px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

footer p {
  margin: 0;
}

@media (max-width: 860px) {
  body {
    font-size: 17px;
  }

  .intro,
  .step,
  .emergency-grid {
    grid-template-columns: 1fr;
  }

  .intro {
    gap: 42px;
    min-height: auto;
    padding: 56px 0 72px;
  }

  .step {
    gap: 36px;
    padding: 64px 0;
  }

  .step.reverse .step-copy {
    order: initial;
  }

  .before-start {
    grid-template-columns: 1fr;
  }

  .before-start ul {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .emergency {
    padding-block: 76px;
  }
}

@media (max-width: 560px) {
  .site-header {
    min-height: 60px;
  }

  .brand {
    font-size: 16px;
  }

  .brand-mark {
    width: 32px;
    height: 32px;
  }

  .help-link {
    max-width: 94px;
    text-align: right;
  }

  .intro,
  .steps,
  .faq,
  .finish {
    width: min(100% - 28px, var(--max));
  }

  h1 {
    font-size: 42px;
  }

  .lead {
    font-size: 18px;
  }

  .steps,
  .faq {
    padding-top: 78px;
  }

  .section-heading {
    margin-bottom: 34px;
  }

  .action-pair {
    grid-template-columns: 1fr;
  }

  .finish {
    padding: 42px 24px;
  }

  footer {
    flex-direction: column;
    width: calc(100% - 28px);
  }
}

@media print {
  .site-header,
  .primary-link {
    display: none;
  }

  body {
    background: white;
  }

  .intro {
    min-height: auto;
  }

  .step,
  .emergency,
  .faq details {
    break-inside: avoid;
  }
}