:root {
  --paper: #F4F7F6; --surface: #FFFFFF; --ink: #1C2A2D; --muted: #5B6A6E; --line: #D5DDDC;
  --accent: #1E5D62; --accent-soft: #E3EFEE; --ok: #2D7748; --ok-soft: #E4F2E8;
  --warn: #9C6412; --warn-soft: #FBF1E1; --stamp: #B0432E; --stamp-soft: #F8E6E1;
  --shadow: 0 1px 2px rgba(28,42,45,.06), 0 6px 20px rgba(28,42,45,.07);
  --r: 14px; --ease: cubic-bezier(.2,.8,.2,1);
}
@media (prefers-color-scheme: dark) {
  :root { --paper:#101819; --surface:#172224; --ink:#E4EBEA; --muted:#98A8AB; --line:#2A3739;
    --accent:#66B6B4; --accent-soft:#1B3133; --ok:#6CC48F; --ok-soft:#18301F; --warn:#E1A64C; --warn-soft:#2E2618;
    --stamp:#E27C66; --stamp-soft:#33201C; --shadow: 0 1px 2px rgba(0,0,0,.4); }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 16px/1.6 "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif; -webkit-font-smoothing: antialiased; }
a { color: var(--accent); }
.wrap { max-width: 880px; margin: 0 auto; padding: 0 20px 80px; }
h1, h2 { font-family: "Fraunces", Georgia, serif; font-weight: 700; letter-spacing: -.01em; line-height: 1.15; }
h2 { font-size: 1.6rem; margin: 0 0 6px; }
.sec { margin-top: 56px; }
.sec > .sub { color: var(--muted); margin: 0 0 20px; }
.small { font-size: .875rem; color: var(--muted); }
.ko { font-size: .85em; color: var(--muted); font-family: "IBM Plex Sans KR", sans-serif; }
.hero h1 .ko { display: block; font-size: 1rem; font-weight: 400; margin-top: 10px; letter-spacing: 0; }
.hero h1 .ko::before { content: "In Korean: "; font-family: "IBM Plex Sans", sans-serif; }

/* top bar + progress */
.topbar { position: sticky; top: 0; z-index: 20; background: color-mix(in srgb, var(--paper) 88%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.topbar .in { max-width: 880px; margin: 0 auto; padding: 10px 20px; display: flex; align-items: center; gap: 14px; }
.brand { font-weight: 600; text-decoration: none; color: var(--ink); white-space: nowrap; }
.brand b { color: var(--accent); }
.prog { flex: 1; display: flex; align-items: center; gap: 10px; font-size: .8rem; color: var(--muted); }
.prog .bar { flex: 1; height: 6px; background: var(--line); border-radius: 99px; overflow: hidden; }
.prog .bar i { display: block; height: 100%; width: 0; background: var(--ok); border-radius: 99px; transition: width .6s var(--ease); }
.lang { font-size: .8rem; white-space: nowrap; }

/* hero */
.hero { padding: 40px 0 8px; }
.eyebrow { display: inline-block; font-size: .78rem; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; color: var(--accent); background: var(--accent-soft); padding: 4px 10px; border-radius: 99px; }
.hero h1 { font-size: clamp(1.9rem, 4.6vw, 2.8rem); margin: 14px 0 12px; }
.lede { font-size: 1.08rem; color: var(--muted); max-width: 680px; margin: 0; }
.meta { margin-top: 10px; }
.tiles { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-top: 28px; }
.tile { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r); padding: 16px; box-shadow: var(--shadow); }
.tile b { display: block; font-family: "Fraunces", Georgia, serif; font-size: 1.7rem; color: var(--accent); line-height: 1.1; }
.tile span { font-size: .85rem; color: var(--muted); }

/* reveal animation (only when JS is on) */
.js .rv { opacity: 0; transform: translateY(18px); transition: opacity .6s var(--ease), transform .6s var(--ease); transition-delay: calc(var(--i, 0) * 80ms); }
.js .rv.in { opacity: 1; transform: none; }

/* card */
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r); box-shadow: var(--shadow); padding: 22px; }

/* eligibility check */
.chk .q { font-weight: 600; font-size: 1.05rem; margin: 0 0 14px; }
.chk .qn { font-size: .78rem; color: var(--muted); font-weight: 600; letter-spacing: .05em; text-transform: uppercase; }
.btns { display: flex; gap: 10px; flex-wrap: wrap; }
.btn { appearance: none; border: 1.5px solid var(--line); background: var(--surface); color: var(--ink); font: inherit; font-weight: 600; padding: 10px 22px; border-radius: 99px; cursor: pointer; transition: transform .15s, border-color .2s, background .2s; }
.btn:hover { border-color: var(--accent); transform: translateY(-1px); }
.btn.pri { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn.ghost { padding: 6px 14px; font-size: .85rem; }
.chk .stage { animation: pop .45s var(--ease); }
.result { display: flex; gap: 14px; align-items: flex-start; padding: 16px; border-radius: 12px; }
.result.ok { background: var(--ok-soft); }
.result.no { background: var(--warn-soft); }
.result .ic { flex: none; width: 36px; height: 36px; border-radius: 50%; display: grid; place-items: center; color: #fff; font-weight: 700; }
.result.ok .ic { background: var(--ok); } .result.no .ic { background: var(--warn); }
.result p { margin: 0 0 8px; }
@keyframes pop { from { opacity: 0; transform: scale(.97) translateY(6px); } to { opacity: 1; transform: none; } }

/* timeline */
.tl { position: relative; display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; padding-top: 8px; }
.tl::before { content: ""; position: absolute; left: 10%; right: 10%; top: 27px; height: 4px; background: var(--line); border-radius: 4px; }
.tl .fill { position: absolute; left: 10%; top: 27px; height: 4px; width: 80%; background: var(--accent); border-radius: 4px; transform-origin: left; transform: scaleX(0); transition: transform 1.6s var(--ease); }
.tl.in .fill { transform: scaleX(1); }
.tl .pt { position: relative; text-align: center; background: none; border: 0; font: inherit; color: inherit; cursor: pointer; padding: 0 4px; }
.tl .dot { width: 42px; height: 42px; margin: 6px auto 10px; border-radius: 50%; background: var(--surface); border: 3px solid var(--accent); display: grid; place-items: center; font-size: .72rem; font-weight: 700; color: var(--accent); transform: scale(0); transition: transform .45s var(--ease), background .2s; transition-delay: calc(var(--i) * 300ms + 200ms); }
.tl.in .dot { transform: scale(1); }
.tl .pt:hover .dot { background: var(--accent-soft); }
.tl .pt.end .dot { border-color: var(--stamp); color: var(--stamp); }
.tl .t { display: block; font-weight: 700; font-size: .95rem; }
.tl .l { display: block; font-size: .82rem; color: var(--muted); line-height: 1.35; }

/* steps */
.steps { list-style: none; margin: 0; padding: 0; position: relative; }
.step { position: relative; padding-left: 64px; padding-bottom: 18px; }
.step::before { content: ""; position: absolute; left: 21px; top: 46px; bottom: -4px; width: 3px; background: var(--line); border-radius: 3px; }
.step:last-child::before { display: none; }
.step::after { content: ""; position: absolute; left: 21px; top: 46px; width: 3px; height: 0; background: var(--ok); border-radius: 3px; transition: height .7s var(--ease); }
.step.done::after { height: calc(100% - 50px); }
.step:last-child::after { display: none; }
.num { position: absolute; left: 0; top: 0; width: 45px; height: 45px; border-radius: 50%; background: var(--surface); border: 3px solid var(--line); display: grid; place-items: center; font-weight: 700; font-size: 1.1rem; color: var(--muted); transition: all .35s var(--ease); }
.step.cur .num { border-color: var(--accent); color: var(--accent); box-shadow: 0 0 0 6px var(--accent-soft); }
.step.done .num { background: var(--ok); border-color: var(--ok); color: #fff; }
.step .card { transition: border-color .3s, opacity .3s; }
.step.cur .card { border-color: var(--accent); }
.js .step.later .card { opacity: .62; }
.shead { display: flex; justify-content: space-between; gap: 12px; align-items: flex-start; cursor: pointer; }
.shead h3 { margin: 0 0 4px; font-size: 1.15rem; }
.badges { display: flex; gap: 6px; flex-wrap: wrap; }
.badge { font-size: .75rem; font-weight: 600; padding: 3px 9px; border-radius: 99px; background: var(--accent-soft); color: var(--accent); }
.badge.when { background: var(--warn-soft); color: var(--warn); }
.chev { flex: none; width: 28px; height: 28px; border-radius: 50%; display: grid; place-items: center; color: var(--muted); transition: transform .3s; }
.step.open .chev { transform: rotate(180deg); }
.sbody { display: grid; grid-template-rows: 1fr; transition: grid-template-rows .45s var(--ease); }
.js .step:not(.open) .sbody { grid-template-rows: 0fr; }
.sbody > div { overflow: hidden; }
.sbody p { margin: 14px 0 10px; }
.todo { list-style: none; padding: 0; margin: 0 0 12px; }
.todo li { margin: 6px 0; }
.todo label { display: flex; gap: 10px; align-items: flex-start; padding: 8px 10px; border-radius: 10px; cursor: pointer; transition: background .2s; }
.todo label:hover { background: var(--accent-soft); }
.todo input { flex: none; width: 20px; height: 20px; margin-top: 2px; accent-color: var(--ok); }
.todo input:checked + span { color: var(--muted); text-decoration: line-through; text-decoration-color: var(--ok); }
.warn { display: flex; gap: 10px; background: var(--warn-soft); color: var(--ink); padding: 10px 12px; border-radius: 10px; font-size: .92rem; margin: 6px 0 12px; }
.warn b { color: var(--warn); }
.sfoot { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }

/* method chooser + doc checklist */
.methods { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-bottom: 18px; }
.method { display: flex; flex-direction: column; align-items: flex-start; justify-content: flex-start; text-align: left; background: var(--surface); border: 2px solid var(--line); border-radius: var(--r); padding: 16px; cursor: pointer; font: inherit; color: inherit; transition: border-color .2s, transform .2s, box-shadow .2s; }
.method:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.method[aria-pressed="true"] { border-color: var(--accent); background: var(--accent-soft); }
.method svg { width: 34px; height: 34px; color: var(--accent); }
.method b { display: block; margin: 8px 0 2px; }
.method span { font-size: .85rem; color: var(--muted); }
.docs { list-style: none; margin: 0; padding: 0; }
.doc { display: flex; gap: 12px; align-items: flex-start; padding: 12px 14px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); margin-bottom: 8px; transition: opacity .3s, transform .35s var(--ease), max-height .35s; }
.doc.off { display: none; }
.doc.enter { animation: slidein .4s var(--ease) both; animation-delay: calc(var(--i, 0) * 60ms); }
.doc input { width: 20px; height: 20px; margin-top: 3px; accent-color: var(--ok); flex: none; }
.doc .w { display: block; font-size: .85rem; color: var(--muted); }
.doc input:checked ~ div b { text-decoration: line-through; color: var(--muted); }
.doccount { font-size: .9rem; margin: 0 0 10px; color: var(--muted); }
.doccount b { color: var(--ok); }
@keyframes slidein { from { opacity: 0; transform: translateX(-12px); } to { opacity: 1; transform: none; } }

/* form guide */
.form { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); gap: 20px; align-items: start; }
.fimg { position: relative; border-radius: 10px; overflow: hidden; border: 1px solid var(--line); background: #fff; box-shadow: var(--shadow); }
.fimg img { display: block; width: 100%; height: auto; }
.fimg .tag { position: absolute; right: 10px; top: 10px; background: var(--stamp); color: #fff; font-size: .7rem; font-weight: 700; letter-spacing: .08em; padding: 3px 8px; border-radius: 4px; }
.zone { position: absolute; padding: 0; margin: 0; background: transparent; font: inherit; border: 2px solid transparent; border-radius: 6px; cursor: pointer; transition: background .25s, border-color .25s; }
.zone:hover { border-color: color-mix(in srgb, var(--accent) 50%, transparent); }
.zone.on { border-color: var(--stamp); background: color-mix(in srgb, var(--stamp) 10%, transparent); }
.pin { position: absolute; left: -12px; top: -12px; width: 26px; height: 26px; border-radius: 50%; background: var(--stamp); color: #fff; font-size: .8rem; font-weight: 700; display: grid; place-items: center; box-shadow: 0 2px 6px rgba(0,0,0,.25); }
.zone:not(.seen) .pin::after { content: ""; position: absolute; inset: 0; border-radius: 50%; border: 2px solid var(--stamp); animation: pulse 1.8s infinite; }
@keyframes pulse { from { transform: scale(1); opacity: .9; } to { transform: scale(2.1); opacity: 0; } }
.fsteps { list-style: none; margin: 0; padding: 0; position: sticky; top: 70px; }
.fs { border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; margin-bottom: 8px; background: var(--surface); cursor: pointer; transition: border-color .25s, box-shadow .25s, transform .25s; }
.fs.on { border-color: var(--stamp); box-shadow: var(--shadow); transform: translateX(4px); }
.fs h4 { margin: 0; display: flex; gap: 8px; align-items: center; font-size: 1rem; }
.fs h4 i { font-style: normal; width: 22px; height: 22px; border-radius: 50%; background: var(--stamp); color: #fff; font-size: .75rem; display: grid; place-items: center; }
.fs p { margin: 6px 0 0; font-size: .92rem; }
.js .fs:not(.on) p { display: none; }
.fnav { display: flex; gap: 8px; margin-top: 10px; }

/* callouts, help */
.two { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.callout h3 { margin: 0 0 8px; font-size: 1.05rem; }
.callout ul { margin: 0; padding-left: 18px; }
.callout li { margin: 4px 0; }
.help { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
.call { display: flex; justify-content: space-between; align-items: center; gap: 12px; text-decoration: none; color: inherit; padding: 14px 16px; }
.call b { font-size: 1.1rem; color: var(--accent); white-space: nowrap; }
.call:hover { border-color: var(--accent); }
footer { margin-top: 56px; padding-top: 20px; border-top: 1px solid var(--line); font-size: .85rem; color: var(--muted); }

/* home list */
.sits { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 14px; margin-top: 28px; }
.sit h3 { margin: 0 0 10px; font-size: 1.05rem; }
.sit ul { list-style: none; margin: 0; padding: 0; }
.sit li { padding: 6px 0; border-top: 1px solid var(--line); }
.sit li:first-child { border-top: 0; }
.soon { color: var(--muted); }
.chip { font-size: .7rem; padding: 2px 7px; border-radius: 99px; background: var(--line); color: var(--muted); margin-left: 6px; }

@media (max-width: 720px) {
  .tiles { grid-template-columns: repeat(2, 1fr); }
  .tl { grid-template-columns: 1fr; gap: 0; padding-left: 4px; }
  .tl::before, .tl .fill { left: 24px; right: auto; top: 20px; bottom: 20px; width: 4px; height: auto; }
  .tl .fill { transform: scaleY(0); transform-origin: top; }
  .tl.in .fill { transform: scaleY(1); }
  .tl .pt { display: grid; grid-template-columns: 52px 1fr; text-align: left; align-items: center; padding: 4px 0; }
  .tl .dot { margin: 4px 0; grid-row: span 2; }
  .methods, .form, .two, .help { grid-template-columns: 1fr; }
  .fsteps { position: static; }
  .step { padding-left: 56px; }
  .prog span.lbl { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .js .rv { opacity: 1; transform: none; }
  .tl .dot { transform: none; } .tl .fill { transform: none; }
}
@media print {
  .topbar, .fnav, .btns, .methods { display: none; }
  .js .step:not(.open) .sbody { grid-template-rows: 1fr; }
  .js .rv { opacity: 1; transform: none; }
}

/* build_vi.py: 베트남어판 */
.hero h1 .ko::before { content: "Tiếng Hàn: "; }