@font-face { font-family: "Pretendard GOV"; font-weight: 400; font-display: swap; src: url("fonts/PretendardGOV-Regular.woff2") format("woff2"); }
@font-face { font-family: "Pretendard GOV"; font-weight: 500; font-display: swap; src: url("fonts/PretendardGOV-Medium.woff2") format("woff2"); }
@font-face { font-family: "Pretendard GOV"; font-weight: 700; font-display: swap; src: url("fonts/PretendardGOV-Bold.woff2") format("woff2"); }

:root {
  --teal: #007e85;
  --teal-dark: #004a50;
  --teal-50: #e6f3f4;
  --ink: #1e2124;
  --body: #464c53;
  --subtle: #58616a;
  --line: #cdd1d5;
  --bg-alt: #f4f5f6;
  --radius: 16px;
  --max: 1120px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: "Pretendard GOV", -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  color: var(--body);
  line-height: 1.6;
  font-size: 17px;
  word-break: keep-all;
  overflow-wrap: break-word;
}
img { max-width: 100%; height: auto; display: block; }
a { color: #006a70; }
a:focus-visible, button:focus-visible { outline: 3px solid #ffb400; outline-offset: 2px; }
h1, h2, h3 { color: var(--ink); line-height: 1.3; margin: 0; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 24px; }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 16px; background: #fff; padding: 8px 12px; z-index: 10; }

/* header */
.site-header { position: sticky; top: 0; z-index: 5; background: rgba(255, 255, 255, .94); backdrop-filter: blur(8px); border-bottom: 1px solid #eceef0; }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.site-header .logo img { height: 30px; width: auto; }
.site-header nav { display: flex; gap: 24px; align-items: center; }
.site-header nav a { color: var(--ink); text-decoration: none; font-weight: 500; font-size: 15px; }
.site-header nav a:hover { color: var(--teal); }
@media (max-width: 720px) { .site-header nav a.opt { display: none; } }

/* buttons */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 14px 24px; border-radius: 10px; font-weight: 700; text-decoration: none; font-size: 16px; }
.btn-primary { background: #fff; color: var(--teal-dark); }
.btn-primary:hover { background: var(--teal-50); }
.btn-ghost { border: 1.5px solid rgba(255, 255, 255, .7); color: #fff; }
.btn-ghost:hover { background: rgba(255, 255, 255, .1); }
.btn-small { padding: 8px 16px; font-size: 14px; background: var(--teal); color: #fff !important; border-radius: 8px; }

/* hero */
.hero { background: linear-gradient(120deg, var(--teal), var(--teal-dark)); color: #fff; overflow: hidden; position: relative; }
.hero .wrap { display: grid; grid-template-columns: 1.15fr .85fr; gap: 48px; align-items: center; padding-top: 72px; padding-bottom: 0; }
.hero .eyebrow { font-weight: 500; color: #d6ecee; letter-spacing: .02em; margin: 0 0 12px; }
.hero h1 { color: #fff; font-size: clamp(34px, 5vw, 54px); letter-spacing: -.02em; }
.hero p.lead { font-size: clamp(17px, 2vw, 20px); color: #e5f2f3; margin: 20px 0 32px; max-width: 34em; }
.hero .actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 72px; }
.hero .phone { align-self: end; justify-self: center; width: min(320px, 80vw); }
@media (max-width: 860px) {
  .hero .wrap { grid-template-columns: 1fr; padding-top: 48px; }
  .hero .actions { margin-bottom: 8px; }
}

.phone { background: #141618; border-radius: 40px 40px 0 0; padding: 12px 12px 0; box-shadow: 0 30px 60px rgba(0, 0, 0, .35); }
.phone img { border-radius: 30px 30px 0 0; }
.phone.full { border-radius: 36px; padding: 10px; box-shadow: 0 18px 40px rgba(0, 30, 33, .18); }
.phone.full img { border-radius: 28px; }

/* problem / solution */
section { padding: 96px 0; }
section.alt { background: var(--bg-alt); }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 56px; }
.section-head h2 { font-size: clamp(28px, 3.6vw, 38px); letter-spacing: -.015em; }
.section-head p { color: var(--subtle); margin: 16px 0 0; font-size: 18px; }

.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.compare .card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 32px; }
.compare .card.good { border: 2px solid var(--teal); }
.compare h3 { font-size: 20px; margin-bottom: 20px; }
.flow { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
.flow span { background: var(--bg-alt); border-radius: 8px; padding: 6px 12px; font-weight: 500; font-size: 15px; color: var(--ink); }
.good .flow span { background: var(--teal-50); color: var(--teal-dark); }
.flow i { font-style: normal; color: var(--subtle); }
.compare ul { margin: 0; padding-left: 20px; }
.compare li { margin: 6px 0; }
@media (max-width: 760px) { .compare { grid-template-columns: 1fr; } }

/* features */
.feature { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; max-width: 960px; margin: 0 auto 96px; }
.feature:last-child { margin-bottom: 0; }
.feature.rev .text { order: 2; }
.feature .phone { width: min(300px, 76vw); justify-self: center; }
.feature .tag { display: inline-block; font-size: 14px; font-weight: 700; color: var(--teal-dark); background: var(--teal-50); border-radius: 99px; padding: 4px 12px; margin-bottom: 14px; }
.feature h3 { font-size: clamp(24px, 3vw, 30px); margin-bottom: 14px; }
.feature ul { padding-left: 20px; margin: 16px 0 0; }
.feature li { margin: 8px 0; }
@media (max-width: 760px) {
  .feature { grid-template-columns: 1fr; gap: 32px; }
  .feature.rev .text { order: 0; }
}

/* security grid */
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid3 .item { background: #fff; border-radius: var(--radius); padding: 28px; border: 1px solid #e3e6e8; }
.grid3 .num { width: 40px; height: 40px; border-radius: 12px; background: var(--teal); color: #fff; display: grid; place-items: center; font-weight: 700; margin-bottom: 16px; }
.grid3 h3 { font-size: 18px; margin-bottom: 8px; }
.grid3 p { margin: 0; font-size: 16px; }
@media (max-width: 900px) { .grid3 { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px) { .grid3 { grid-template-columns: 1fr; } }

/* steps */
.steps { counter-reset: s; list-style: none; padding: 0; margin: 0 auto; max-width: 760px; }
.steps li { counter-increment: s; position: relative; padding: 0 0 32px 64px; }
.steps li::before { content: counter(s); position: absolute; left: 0; top: 0; width: 40px; height: 40px; border-radius: 50%; border: 2px solid var(--teal); color: var(--teal); font-weight: 700; display: grid; place-items: center; }
.steps li:not(:last-child)::after { content: ""; position: absolute; left: 19px; top: 44px; bottom: 4px; width: 2px; background: var(--line); }
.steps h3 { font-size: 19px; margin: 6px 0 6px; }
.steps p { margin: 0; }

/* faq */
.faq { max-width: 760px; margin: 0 auto; }
.faq details { border-bottom: 1px solid var(--line); padding: 20px 0; }
.faq summary { cursor: pointer; font-weight: 700; color: var(--ink); font-size: 18px; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--teal); font-size: 24px; line-height: 1; }
.faq details[open] summary::after { content: "−"; }
.faq details p { margin: 12px 0 0; }

/* cta */
.cta { background: linear-gradient(120deg, var(--teal), var(--teal-dark)); color: #fff; text-align: center; }
.cta h2 { color: #fff; font-size: clamp(28px, 3.6vw, 36px); }
.cta p { color: #d6ecee; margin: 16px 0 32px; }

/* footer */
footer { background: #1e2124; color: #b1b8be; font-size: 14px; padding: 40px 0; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 16px 32px; justify-content: space-between; align-items: center; }
footer img { height: 26px; width: auto; }
footer a { color: #fff; }
footer nav { display: flex; gap: 20px; }

/* document page (privacy policy) */
.doc { max-width: 820px; margin: 0 auto; padding: 56px 24px 96px; }
.doc h1 { font-size: clamp(28px, 4vw, 38px); margin-bottom: 8px; }
.doc .meta { color: var(--subtle); margin: 0 0 32px; }
.doc .summary { background: var(--teal-50); border-radius: var(--radius); padding: 24px 28px; margin-bottom: 40px; }
.doc .summary h2 { font-size: 18px; margin: 0 0 8px; border: 0; padding: 0; }
.doc .summary ul { margin: 0; padding-left: 20px; }
.doc .toc { border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 28px; margin-bottom: 48px; }
.doc .toc ol { margin: 8px 0 0; padding-left: 22px; columns: 2; column-gap: 32px; }
.doc .toc li { margin: 4px 0; break-inside: avoid; }
@media (max-width: 640px) { .doc .toc ol { columns: 1; } }
.doc h2 { font-size: 22px; margin: 48px 0 16px; padding-top: 8px; scroll-margin-top: 80px; }
.doc h3 { font-size: 18px; margin: 24px 0 8px; }
.doc table { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: 15px; }
.doc th, .doc td { border: 1px solid var(--line); padding: 10px 12px; text-align: left; vertical-align: top; }
.doc th { background: var(--bg-alt); color: var(--ink); font-weight: 700; }
.doc .table-scroll { overflow-x: auto; }
.doc .table-scroll table:has(thead) { min-width: 560px; }
.doc .note { color: var(--subtle); font-size: 15px; }

/* server downloads */
.downloads { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; max-width: 960px; margin: 0 auto; }
.dl { border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; background: #fff; min-width: 0; }
.dl h3 { font-size: 22px; }
.dl .meta { color: var(--subtle); font-size: 15px; margin: 6px 0 18px; }
.dl ol { margin: 20px 0 0; padding-left: 20px; }
.dl li { margin: 8px 0; }
.dl code { font-family: Consolas, "D2Coding", monospace; font-size: 14px; background: var(--bg-alt); border-radius: 4px; padding: 1px 6px; word-break: keep-all; overflow-wrap: anywhere; }
.dl .hash { font-size: 13px; color: var(--subtle); margin: 18px 0 0; word-break: break-all; }
.dl .hash code { font-size: 12px; }
.btn-solid { background: var(--teal); color: #fff; }
.btn-solid:hover { background: var(--teal-dark); }
.dl.wide { grid-column: 1 / -1; }
.dl-note { text-align: center; color: var(--subtle); font-size: 15px; max-width: 760px; margin: 28px auto 0; }
@media (max-width: 760px) { .downloads { grid-template-columns: 1fr; } }

.cta-actions { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }
.cta-note { font-size: 14px; margin: 18px 0 0 !important; color: #d6ecee; word-break: break-all; }
.cta-note code { font-family: Consolas, "D2Coding", monospace; font-size: 12px; }

/* account deletion form */
.del-form { display: grid; gap: 8px; max-width: 420px; margin: 16px 0 24px; }
.del-form label { font-weight: 700; font-size: 15px; }
.del-form input[type=email], .del-form input[type=password] { font: inherit; padding: 12px; border: 1px solid #8a949e; border-radius: 8px; }
.del-form .check { font-weight: 400; display: flex; gap: 8px; align-items: flex-start; margin-top: 8px; }
.del-form .check input { margin-top: 5px; }
.del-form #msg { margin: 4px 0; min-height: 1.5em; }
.del-form #msg.bad { color: #bd2c0f; }
.del-form #msg.ok { color: #1f6f3a; }
.btn-danger { background: #bd2c0f; color: #fff; border: 0; cursor: pointer; justify-content: center; }
.btn-danger:hover { background: #8a1f0a; }
.btn-danger:disabled { opacity: .6; cursor: default; }

/* guide pages: commands */
.doc code { font-family: Consolas, "D2Coding", monospace; font-size: .9em; background: var(--bg-alt); border-radius: 4px; padding: 1px 6px; word-break: keep-all; overflow-wrap: anywhere; }
.doc pre { background: #1e2124; color: #e8eaed; border-radius: 8px; padding: 14px 16px; overflow-x: auto; margin: 12px 0 16px; }
.doc pre code { background: none; color: inherit; padding: 0; font-size: 14px; word-break: normal; white-space: pre; }
.doc .summary code { font-size: .85em; }