:root{
  --bg:#FFFFFF; --ink:#2E3138; --sub:#737884; --line:#E6E8EC; --soft:#F6F8FB;
  --blue:#1447A6; --sky:#3C9FD9; --sky-soft:#EAF4FB; --coral:#E0605E;
  --visa:#E9EFFA; --arrival:#FDEEEC; --life:#EAF6EF; --work:#F2F1EE;
  --logo:"Playfair Display",Georgia,serif;
  --nav:"Oswald","Arial Narrow",Arial,sans-serif;
  --head:"Poppins","Helvetica Neue",Arial,sans-serif;
  --body:"Nunito Sans","Helvetica Neue",Arial,sans-serif;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  color-scheme:dark;--bg:#12151B;--ink:#E7E9EE;--sub:#9AA1AE;--line:#262B35;--soft:#181C24;
  --blue:#8DB4FF;--sky:#5DB5EA;--sky-soft:#17263A;--coral:#F08784;
  --visa:#1A2235;--arrival:#2E1D1F;--life:#18291F;--work:#23231F;}}
:root[data-theme="dark"]{
  color-scheme:dark;--bg:#12151B;--ink:#E7E9EE;--sub:#9AA1AE;--line:#262B35;--soft:#181C24;
  --blue:#8DB4FF;--sky:#5DB5EA;--sky-soft:#17263A;--coral:#F08784;
  --visa:#1A2235;--arrival:#2E1D1F;--life:#18291F;--work:#23231F;}
*{box-sizing:border-box}
body{background:var(--bg);color:var(--ink);font:16px/1.7 var(--body);margin:0}
a{color:inherit;text-decoration:none}
.wrap{max-width:1000px;margin:0 auto;padding-inline:20px}
h1,h2,h3{margin:0;font-family:var(--head);font-weight:400;text-wrap:balance}
p{margin:0}
:focus-visible{outline:2px solid var(--sky);outline-offset:3px}

/* ---------- header ---------- */
.util{display:flex;justify-content:flex-end;gap:16px;padding-block:12px;font-size:.82rem;color:var(--sub)}
.util a:hover{color:var(--ink)}
.brand{display:grid;justify-items:center;gap:6px;padding-block:28px 34px}
.brand .logo{font:700 clamp(2.4rem,7vw,3.6rem)/1 var(--logo);color:var(--blue);letter-spacing:-.01em}
.brand .tag{font:400 .72rem/1 var(--head);letter-spacing:.42em;color:var(--sky);display:flex;align-items:center;gap:10px;text-transform:none}
.brand .tag::before,.brand .tag::after{content:"";width:18px;height:1px;background:var(--sky)}
header nav{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;background:var(--bg);border-bottom:1px solid var(--line)}
.menu{display:flex;justify-content:center;gap:34px;padding-block:14px;overflow-x:auto;scrollbar-width:none}
.menu a{font:500 .8rem/1 var(--nav);letter-spacing:.04em;text-transform:uppercase;white-space:nowrap;padding-bottom:4px;border-bottom:2px solid transparent}
.menu a[aria-current="page"]{border-color:var(--blue);color:var(--blue)}
@media (max-width:760px){.menu{justify-content:flex-start;gap:22px;padding-inline:20px}}

/* ---------- hero ---------- */
.hero{position:relative;height:clamp(280px,40vw,420px);overflow:hidden;background:linear-gradient(#DCEBF6,#F4F8FB 70%)}
.hero svg{position:absolute;inset:auto 0 0 0;width:100%;height:100%}
.hero .copy{position:absolute;inset:0;display:grid;place-content:center;text-align:center;padding:0 20px 22%}
.hero h1{font:300 clamp(1.5rem,3.6vw,2.4rem)/1.45 var(--head);color:#23324A}
.hero h1 b{font-weight:600;color:#1447A6}
:root[data-theme="dark"] .hero{background:linear-gradient(#1B2B40,#12151B 75%)}
:root[data-theme="dark"] .hero h1{color:#E7E9EE}
:root[data-theme="dark"] .hero h1 b{color:#8DB4FF}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]) .hero{background:linear-gradient(#1B2B40,#12151B 75%)}
  :root:not([data-theme="light"]) .hero h1{color:#E7E9EE}
  :root:not([data-theme="light"]) .hero h1 b{color:#8DB4FF}}

/* ---------- sections ---------- */
.sec{padding-block:88px}
.sec-title{font:400 clamp(2rem,4.5vw,2.8rem)/1.1 var(--head);text-align:center;margin-bottom:56px}
.sec-title small{display:block;font:500 .72rem/1 var(--nav);letter-spacing:.2em;text-transform:uppercase;color:var(--sky);margin-bottom:14px}
.three{display:grid;gap:56px 32px;text-align:center}
@media (min-width:760px){.three{grid-template-columns:repeat(3,1fr)}}
.three svg{width:190px;height:140px;margin:0 auto 26px;display:block}
.three h3{font:400 1.55rem/1.1 var(--head);text-transform:uppercase;letter-spacing:.01em;margin-bottom:12px}
.three p{color:var(--sub);font-size:.93rem;max-width:30ch;margin:0 auto}

/* ---------- guide cards ---------- */
.cards{display:grid;gap:40px 24px}
@media (min-width:640px){.cards{grid-template-columns:repeat(2,1fr)}}
@media (min-width:900px){.cards{grid-template-columns:repeat(3,1fr)}}
.item{display:grid;gap:14px;align-content:start}
.cover{container-type:inline-size;position:relative;aspect-ratio:4/3;overflow:hidden;background:var(--c);border-radius:4px;max-width:100%}
.cover img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.cover .ghost{position:absolute;right:6%;bottom:-6%;font:600 38cqi/1 var(--head);letter-spacing:-.04em;color:var(--blue);opacity:.12;white-space:nowrap}
.cover .lbl{position:absolute;top:16px;left:18px;font:500 .68rem/1 var(--nav);letter-spacing:.14em;text-transform:uppercase;color:var(--blue)}
.cover .head{position:absolute;left:18px;right:18px;bottom:20px;font:500 clamp(1.1rem,6.5cqi,1.45rem)/1.25 var(--head);color:var(--ink)}
.item .cap{font-size:.92rem;color:var(--sub);line-height:1.55}
.item .meta{font:500 .7rem/1 var(--nav);letter-spacing:.12em;text-transform:uppercase;color:var(--coral)}
.item:hover .head{color:var(--blue)}
.center{text-align:center}
.more{display:inline-block;margin-top:48px;font:500 .8rem/1 var(--nav);letter-spacing:.12em;text-transform:uppercase;padding:14px 28px;border:1px solid var(--ink)}
.more:hover{background:var(--ink);color:var(--bg)}

/* ---------- popular ---------- */
.pop{background:var(--soft)}
.pop ol{list-style:none;margin:0 auto;padding:0;max-width:720px;counter-reset:n}
.pop li{counter-increment:n;display:flex;gap:18px;align-items:baseline;padding:18px 0;border-bottom:1px solid var(--line)}
.pop li::before{content:counter(n,decimal-leading-zero);font:500 .9rem var(--nav);color:var(--sky);font-variant-numeric:tabular-nums}
.pop li a{font:400 1.02rem/1.4 var(--head);flex:1}
.pop li span{font:500 .66rem var(--nav);letter-spacing:.12em;text-transform:uppercase;color:var(--sub)}

/* ---------- book feature ---------- */
.feature{display:grid;gap:48px;align-items:center}
@media (min-width:800px){.feature{grid-template-columns:300px 1fr;gap:72px}}
.book{aspect-ratio:3/4;max-width:300px;width:100%;margin:0 auto;background:var(--blue);color:#fff;padding:26px;display:flex;flex-direction:column;justify-content:space-between;border-radius:2px 8px 8px 2px;box-shadow:inset 10px 0 0 rgba(0,0,0,.12),0 24px 40px -22px rgba(20,71,166,.6)}
.book small{font:500 .66rem/1.3 var(--nav);letter-spacing:.16em;text-transform:uppercase;opacity:.85}
.book strong{font:700 2.3rem/1.05 var(--logo)}
.book span{font-size:.85rem;opacity:.9}
.feature h2{font:400 clamp(1.8rem,3.6vw,2.4rem)/1.2 var(--head)}
.feature p{color:var(--sub);margin-top:16px;max-width:52ch}
.btns{display:flex;gap:10px;flex-wrap:wrap;margin-top:28px}
.btn{display:inline-flex;align-items:center;justify-content:center;font:500 .82rem/1 var(--nav);letter-spacing:.1em;text-transform:uppercase;padding:15px 26px;border:1px solid var(--blue);color:var(--blue);background:transparent;cursor:pointer}
.btn.fill{background:var(--blue);color:var(--bg)}
.btn:hover{filter:brightness(1.08)}

/* ---------- forms ---------- */
.signup{background:var(--sky-soft)}
.signup .inner{max-width:560px;margin:0 auto;text-align:center}
.signup .lead{color:var(--sub);margin:-32px auto 36px;max-width:48ch}
form{display:grid;gap:16px;text-align:left}
label{display:grid;gap:6px;font:500 .72rem/1 var(--nav);letter-spacing:.1em;text-transform:uppercase;color:var(--sub)}
input,select,textarea{font:400 1rem var(--body);letter-spacing:0;text-transform:none;padding:13px 14px;border:1px solid var(--line);background:var(--bg);color:var(--ink);width:100%;border-radius:4px}
textarea{min-height:110px;resize:vertical}
.two{display:grid;gap:16px}
@media (min-width:520px){.two{grid-template-columns:1fr 1fr}}
.check{display:flex;gap:10px;align-items:flex-start;font:400 .85rem/1.5 var(--body);letter-spacing:0;text-transform:none}
.check input{width:18px;height:18px;margin-top:2px;flex:none;padding:0}
.check a{text-decoration:underline}
.msg{font-size:.9rem;padding:12px 14px;background:var(--bg);border-left:3px solid var(--sky);border-radius:2px}

/* ---------- inner pages ---------- */
.ph{text-align:center;padding-block:72px 40px}
.ph small{display:block;font:500 .72rem/1 var(--nav);letter-spacing:.2em;text-transform:uppercase;color:var(--sky);margin-bottom:16px}
.ph h1{font:400 clamp(1.9rem,4.8vw,3rem)/1.2 var(--head);max-width:24ch;margin:0 auto}
.ph p{color:var(--sub);max-width:58ch;margin:18px auto 0}
.filters{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;margin-bottom:48px}
.filters button{font:500 .75rem/1 var(--nav);letter-spacing:.1em;text-transform:uppercase;padding:10px 16px;border:1px solid var(--line);background:transparent;color:var(--ink);cursor:pointer;border-radius:999px}
.filters button[aria-pressed="true"]{background:var(--blue);border-color:var(--blue);color:var(--bg)}
.split{display:grid;gap:56px;padding-block:24px 88px}
@media (min-width:900px){.split{grid-template-columns:1.1fr .9fr;gap:72px}}
.split h2{font:400 1.6rem var(--head);margin-bottom:20px}
.toc{list-style:none;margin:0;padding:0;border-top:1px solid var(--line)}
.toc li{display:grid;grid-template-columns:2.8rem 1fr;padding:16px 0;border-bottom:1px solid var(--line)}
.toc .n{font:500 .95rem var(--nav);color:var(--sky);font-variant-numeric:tabular-nums}
.toc b{font:500 1rem var(--head)}
.toc span{display:block;color:var(--sub);font-size:.9rem}
.toc em{font:500 .62rem var(--nav);font-style:normal;letter-spacing:.1em;color:var(--coral);margin-left:8px}
.plans{display:grid;gap:14px}
.plan{border:1px solid var(--line);border-radius:6px;padding:22px;display:grid;gap:10px}
.plan.best{border-color:var(--blue);box-shadow:0 0 0 1px var(--blue)}
.plan .top2{display:flex;justify-content:space-between;align-items:baseline;gap:12px}
.plan h3{font:500 1.15rem var(--head)}
.plan.best h3::after{content:"Most useful";font:500 .62rem var(--nav);letter-spacing:.1em;text-transform:uppercase;color:var(--coral);margin-left:10px;vertical-align:middle}
.plan .price{font:600 1.7rem/1 var(--head);color:var(--blue)}
.plan .price small{font:400 .8rem var(--body);color:var(--sub)}
.plan p{color:var(--sub);font-size:.92rem}
.prose{max-width:64ch;margin:0 auto;display:grid;gap:18px;padding-block:8px 88px}
.prose .msg{background:var(--soft)}
.prose a{text-decoration:underline}

.bi{display:grid;gap:8px}
.ko{font-family:"Noto Sans KR","Apple SD Gothic Neo","Malgun Gothic",sans-serif;font-weight:300;color:var(--sub);font-size:.95rem;line-height:1.8;word-break:keep-all}
.ph .ko{font-size:1.1rem;margin-top:12px}

.about-lead{font:300 1.3rem/1.6 var(--head)}
.about-h{font:400 1.5rem var(--head);margin-top:24px;display:flex;align-items:baseline;gap:12px}
.about-h .ko{font-size:1rem}
.does{list-style:none;margin:0;padding:0;border-top:1px solid var(--line)}
.does li{display:grid;gap:4px;padding:20px 0;border-bottom:1px solid var(--line)}
.does b{font:500 1.05rem var(--head);color:var(--blue)}

.post{max-width:720px;padding-block:56px 88px}
.post-h{text-align:center;margin-bottom:40px}
.post-h small{display:block;font:500 .72rem/1 var(--nav);letter-spacing:.2em;text-transform:uppercase;color:var(--sky);margin-bottom:16px}
.post-h h1{font:400 clamp(1.8rem,4.4vw,2.6rem)/1.25 var(--head)}
.post-meta{font-size:.8rem;color:var(--sub);margin-top:14px}
.post-meta a{text-decoration:underline}
.post-lead{font:300 1.2rem/1.7 var(--head);margin-bottom:28px}
.post h2{font:500 1.35rem/1.3 var(--head);margin:44px 0 12px;color:var(--blue)}
.post h3{font:500 1rem var(--head);margin:26px 0 8px}
.post p{margin-bottom:10px}
.post a{color:var(--blue);text-decoration:underline}
.checklist{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.checklist li{position:relative;padding:12px 14px 12px 44px;background:var(--soft);border-radius:6px}
.checklist li::before{content:"";position:absolute;left:14px;top:14px;width:16px;height:16px;border:2px solid var(--sky);border-radius:4px}
.plain{padding-left:1.1rem;display:grid;gap:10px}
.note{font-size:.92rem;color:var(--sub);border-left:3px solid var(--line);padding-left:14px;margin-top:12px}
.callout{background:var(--sky-soft);padding:16px 18px;border-radius:6px;font-size:.95rem}
.tip{margin-top:40px;padding:20px;border:1px dashed var(--coral);border-radius:8px}
.tip b{font:500 .75rem var(--nav);letter-spacing:.14em;text-transform:uppercase;color:var(--coral)}
.post-fig{margin:0 0 32px}
.post-fig img{width:100%;height:auto;display:block;border-radius:6px;aspect-ratio:3/2;object-fit:cover}
.post-fig figcaption{font-size:.8rem;color:var(--sub);margin-top:8px;text-align:center}
.cover img + .lbl{color:#fff;text-shadow:0 1px 6px rgba(0,0,0,.4)}
.cover img ~ .head{color:#fff;text-shadow:0 2px 10px rgba(0,0,0,.45)}
.cover:has(img)::after{content:"";position:absolute;inset:0;background:linear-gradient(rgba(0,0,0,.15),transparent 30%,transparent 45%,rgba(0,0,0,.6));z-index:1}
.cover:has(img) .lbl,.cover:has(img) .head{z-index:2}
.tablewrap{overflow-x:auto;margin:12px 0}
.words{border-collapse:collapse;width:100%;font-size:.93rem}
.words th,.words td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:top}
.words th{font:500 .7rem var(--nav);letter-spacing:.1em;text-transform:uppercase;color:var(--sub)}
.words td[lang="ko"]{font-family:"Noto Sans KR",sans-serif;white-space:nowrap}
ol.plain{padding-left:1.3rem}
.post-cta{margin-top:48px;padding:28px;background:var(--sky-soft);border-radius:8px;display:grid;gap:16px;justify-items:start}
.post .btn{text-decoration:none}

/* ---------- footer ---------- */
footer{border-top:1px solid var(--line);background:var(--soft)}
footer .wrap{display:grid;gap:14px;justify-items:center;text-align:center;padding-block:44px;font-size:.8rem;color:var(--sub)}
footer .logo{font:700 1.4rem var(--logo);color:var(--blue)}
footer nav{display:flex;gap:20px;flex-wrap:wrap;justify-content:center;font:500 .75rem var(--nav);letter-spacing:.1em;text-transform:uppercase;color:var(--ink)}
.nav-topics{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;margin-bottom:48px}
.nav-topics a{font:500 .75rem/1 var(--nav);letter-spacing:.1em;text-transform:uppercase;padding:10px 16px;border:1px solid var(--line);border-radius:999px}
.nav-topics a[aria-current="page"]{background:var(--blue);border-color:var(--blue);color:var(--bg)}