:root {
  --primary: #1f4fbf;
  --primary-dark: #173d96;
  --paid: #b4501a;
  --bg: #f5f6f8;
  --card: #ffffff;
  --text: #12161f;
  --muted: #4a5361;
  --line: #dfe3ea;
  --ok: #1f7a4d;
  --danger: #b3261e;
  --mono: "IBM Plex Mono", ui-monospace, Consolas, monospace;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "IBM Plex Sans KR", "Be Vietnam Pro", system-ui, -apple-system, "Segoe UI", sans-serif;
  line-height: 1.65;
  overflow-wrap: anywhere;
}
a { color: var(--primary); }
img, svg { max-width: 100%; }
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 16px; }

/* header */
.site-header { position: sticky; top: 0; z-index: 10; background: rgba(245, 246, 248, .94); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 56px; }
.logo { display: inline-flex; align-items: center; gap: 8px; font-weight: 700; font-size: 18px; color: var(--text); text-decoration: none; letter-spacing: .02em; }
.logo svg { width: 30px; height: 20px; flex: none; }
.logo b { color: var(--primary); }
.lang { display: inline-flex; border: 1px solid var(--line); border-radius: 999px; background: #fff; overflow: hidden; }
.lang button { border: 0; background: transparent; padding: 6px 12px; font: inherit; font-size: 13px; color: var(--muted); cursor: pointer; }
.lang button[aria-pressed="true"] { background: var(--primary); color: #fff; }

/* hero */
.hero { padding: 40px 0 24px; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr); gap: 32px; align-items: center; }
.eyebrow { display: inline-block; font-size: 13px; font-weight: 600; color: var(--primary); background: #e6edfb; border-radius: 999px; padding: 4px 12px; }
h1 { font-size: clamp(28px, 6vw, 44px); line-height: 1.25; margin: 14px 0 12px; letter-spacing: -.01em; }
.lead { font-size: 17px; color: var(--muted); margin: 0 0 20px; }
.cta { display: flex; flex-wrap: wrap; gap: 10px; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 46px; padding: 0 20px; border-radius: 12px; font: inherit; font-weight: 600; text-decoration: none; border: 1px solid transparent; cursor: pointer; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-ghost { background: #fff; color: var(--text); border-color: var(--line); }
.btn[aria-disabled="true"] { opacity: .75; cursor: default; }
.note { font-size: 13px; color: var(--muted); margin-top: 10px; }

/* sample card */
.sample { background: var(--card); border: 1px solid var(--line); border-radius: 18px; padding: 18px; box-shadow: 0 6px 24px rgba(18, 22, 31, .06); }
.sample .tag { display: inline-block; font-size: 12px; font-weight: 600; color: var(--paid); background: #fbeee6; padding: 2px 10px; border-radius: 999px; }
.sample .row { margin-top: 12px; padding: 10px 12px; border-radius: 10px; font-size: 15px; }
.sample .before { background: #fdecea; text-decoration: line-through; text-decoration-color: rgba(179, 38, 30, .5); }
.sample .after { background: #e8f5ee; font-weight: 600; }
.sample .why { margin-top: 12px; font-size: 14px; color: var(--muted); }
.sample .score { margin-top: 14px; display: flex; justify-content: space-between; align-items: baseline; border-top: 1px dashed var(--line); padding-top: 12px; font-size: 14px; color: var(--muted); }
.sample .score b { font-family: var(--mono); font-size: 20px; color: var(--text); }

/* sections */
section.block { padding: 36px 0; }
h2 { font-size: clamp(22px, 4.5vw, 30px); margin: 0 0 8px; line-height: 1.3; }
.sub { color: var(--muted); margin: 0 0 22px; }
.grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 18px; }
.card h3 { margin: 10px 0 6px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.card.paid { border-color: #efcdb8; }
.card.paid .ico { background: #fbeee6; color: var(--paid); }
.ico { width: 40px; height: 40px; border-radius: 12px; background: #e6edfb; color: var(--primary); display: grid; place-items: center; font-weight: 700; font-family: var(--mono); font-size: 14px; }
.steps { counter-reset: s; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; padding: 0; margin: 0; list-style: none; }
.steps li { counter-increment: s; background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 18px; }
.steps li::before { content: counter(s); display: inline-grid; place-items: center; width: 28px; height: 28px; border-radius: 50%; background: var(--primary); color: #fff; font-family: var(--mono); font-size: 14px; margin-bottom: 8px; }
.steps strong { display: block; margin-bottom: 4px; }
.steps span { color: var(--muted); font-size: 15px; }
.free { background: #e6edfb; border-radius: 18px; padding: 22px; }
.free ul { margin: 8px 0 0; padding-left: 20px; color: var(--muted); }

/* footer */
.site-footer { margin-top: 40px; border-top: 1px solid var(--line); background: #eceff4; padding: 28px 0 40px; font-size: 14px; color: var(--muted); }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 6px 18px; margin-bottom: 14px; }
.site-footer a { color: var(--text); }
.site-footer p { margin: 6px 0; }

/* legal pages */
.doc { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 22px 18px; margin: 24px 0; }
.doc h1 { font-size: clamp(24px, 5vw, 32px); margin-top: 0; }
.doc h2 { font-size: 19px; margin: 26px 0 6px; }
.doc p, .doc li { color: #262d3a; }
.doc table { width: 100%; border-collapse: collapse; font-size: 14px; display: block; overflow-x: auto; }
.doc th, .doc td { border: 1px solid var(--line); padding: 6px 10px; text-align: left; vertical-align: top; }
.doc .meta { font-size: 13px; color: var(--muted); }
.doc .warn { background: #fbeee6; border-radius: 10px; padding: 10px 14px; }

html[lang="vi"] [data-lang]:not([data-lang="vi"]),
html[lang="en"] [data-lang]:not([data-lang="en"]),
html[lang="ko"] [data-lang]:not([data-lang="ko"]) { display: none; }

@media (max-width: 760px) {
  .hero-grid, .grid, .steps { grid-template-columns: minmax(0, 1fr); }
  .hero { padding-top: 24px; }
}