/* 성공펭귄 — 흑백, 장식 없음. 한 열, 큰 버튼, 칸 하나. */
:root { --ink: #111; --paper: #fff; --dim: #666; --line: #ddd; --w: 680px; }
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 18px/1.75 -apple-system, "Apple SD Gothic Neo", "Pretendard", "Noto Sans KR", "Malgun Gothic", sans-serif; word-break: keep-all; overflow-wrap: anywhere; }
main, header.top, footer { max-width: var(--w); margin: 0 auto; padding: 0 20px; }
header.top { display: flex; justify-content: space-between; align-items: baseline; padding-top: 22px; padding-bottom: 6px; }
header.top a { color: inherit; text-decoration: none; }
header.top .brand { font-weight: 700; letter-spacing: .08em; }
header.top nav a { margin-left: 18px; font-size: 16px; color: var(--dim); }
h1 { font-size: 34px; line-height: 1.3; margin: 40px 0 14px; letter-spacing: -.01em; }
h2 { font-size: 26px; line-height: 1.35; margin: 44px 0 10px; }
h3 { font-size: 21px; line-height: 1.4; margin: 36px 0 8px; }
p { margin: 0 0 1.2em; }
a { color: inherit; text-decoration: underline; text-underline-offset: 3px; }
img, video, iframe { max-width: 100%; height: auto; display: block; margin: 24px auto; }
blockquote { margin: 24px 0; padding: 0 0 0 18px; border-left: 3px solid var(--ink); color: var(--ink); }
hr { border: 0; border-top: 1px solid var(--line); margin: 40px 0; }
.dim { color: var(--dim); }
.small { font-size: 15px; }
.meta { color: var(--dim); font-size: 15px; margin: 0 0 28px; }
.lede { font-size: 21px; line-height: 1.6; margin: 0 0 28px; }

/* 칸 하나 + 큰 버튼 (직접반응 문법: 한 페이지에 부탁 하나, 버튼은 크고 검게) */
form.opt { margin: 28px 0; }
input[type=email], input[type=text] { width: 100%; height: 56px; padding: 0 16px; font: inherit; border: 2px solid var(--ink); border-radius: 6px; background: #fff; color: var(--ink); }
input:focus { outline: 3px solid #000; outline-offset: 2px; }
button, .btn { display: block; width: 100%; height: 60px; margin: 12px 0 0; padding: 0 20px; font: inherit; font-size: 19px; font-weight: 700; color: #fff; background: var(--ink); border: 0; border-radius: 6px; cursor: pointer; text-align: center; text-decoration: none; line-height: 60px; }
button:disabled { opacity: .5; cursor: default; }
.btn.ghost { background: #fff; color: var(--ink); border: 2px solid var(--ink); line-height: 56px; }
.note { font-size: 14px; color: var(--dim); margin: 10px 0 0; line-height: 1.5; }
.err { color: #b00020; font-size: 15px; margin: 8px 0 0; min-height: 1.5em; }
.ok { border: 2px solid var(--ink); border-radius: 6px; padding: 18px 20px; margin: 28px 0; }
label.chk { display: flex; gap: 10px; align-items: flex-start; font-size: 15px; margin: 14px 0; line-height: 1.5; }
label.chk input { width: 20px; height: 20px; margin-top: 3px; flex: none; }

/* 목록 */
ul.list { list-style: none; padding: 0; margin: 0; }
ul.list li { padding: 18px 0; border-top: 1px solid var(--line); }
ul.list li:last-child { border-bottom: 1px solid var(--line); }
ul.list a { text-decoration: none; font-weight: 700; font-size: 20px; line-height: 1.4; }
ul.list .meta { margin: 4px 0 0; }

/* 글(레터·세일즈 레터) */
article { margin-top: 8px; }
article p, article li { font-size: 18px; }
article img { border: 1px solid var(--line); }
.box { border: 2px solid var(--ink); border-radius: 6px; padding: 22px 22px 18px; margin: 40px 0; }
.box h3 { margin-top: 0; }
.reply { border-top: 1px solid var(--line); padding-top: 20px; margin-top: 44px; }

/* 결제 */
table.order { width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 17px; }
table.order td { padding: 12px 0; border-bottom: 1px solid var(--line); }
table.order td:last-child { text-align: right; font-weight: 700; }

footer { margin-top: 80px; padding-top: 24px; padding-bottom: 60px; border-top: 1px solid var(--line); font-size: 14px; color: var(--dim); line-height: 1.7; }
footer a { color: var(--dim); }
footer nav a { margin-right: 14px; }
@media (max-width: 600px) { body { font-size: 17px; } h1 { font-size: 28px; margin-top: 28px; } h2 { font-size: 23px; } header.top nav a { margin-left: 12px; font-size: 15px; } }
@media (prefers-color-scheme: dark) { :root { --ink: #eee; --paper: #111; --dim: #999; --line: #333; } input[type=email], input[type=text] { background: #111; } button, .btn { color: #111; } .btn.ghost { background: #111; color: #eee; } input:focus { outline-color: #fff; } }