:root {
  --font: "Pretendard", "Apple SD Gothic Neo", "Noto Sans KR", "Malgun Gothic", system-ui, sans-serif;
  --bg: #f3f4f7; --paper: #fff; --ink: #151824; --ink-2: #555b70; --line: #d9dce6;
  --accent: #2b4acb; --accent-ink: #fff; --accent-soft: #e6eafb;
  --good: #1d7a4d; --mid: #b7791f;
  --radius: 14px; color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #11131a; --paper: #1a1d27; --ink: #eceef6; --ink-2: #aeb3c6; --line: #323649;
    --accent: #8ea2ff; --accent-ink: #0b1030; --accent-soft: #232b52; --good: #52c58a; --mid: #e6a23c; }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; font-family: var(--font); background: var(--bg); color: var(--ink); line-height: 1.6; overflow-x: hidden; word-break: keep-all; overflow-wrap: anywhere; }
.skip { position: absolute; left: -999px; } .skip:focus { left: 8px; top: 8px; background: var(--paper); padding: 8px; z-index: 9; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
[hidden] { display: none !important; }
.wrap, .hero, .foot { max-width: 880px; margin: 0 auto; padding: 0 16px; }
.hero { padding-top: 28px; padding-bottom: 4px; }
.eyebrow { margin: 0; color: var(--accent); font-weight: 700; font-size: 14px; }
h1 { font-size: clamp(24px, 6vw, 36px); line-height: 1.3; margin: 6px 0 10px; letter-spacing: -0.02em; }
.lede { margin: 0; color: var(--ink-2); max-width: 44em; }
.notice { margin: 12px 0 0; padding: 8px 12px; border-left: 4px solid var(--mid); font-size: 14px; color: var(--ink-2); }
h2 { font-size: 18px; margin: 0 0 12px; }
h2:focus { outline: none; }
.panel, .guide { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; margin: 16px 0; }
.muted { color: var(--ink-2); font-size: 14px; margin: 8px 0 0; }
button, textarea, input { font: inherit; font-size: 16px; }
button:focus-visible, summary:focus-visible, a:focus-visible, textarea:focus-visible, .symopt:focus-within, .step label:focus-within { outline: 3px solid var(--accent); outline-offset: 2px; }

.syms { display: grid; grid-template-columns: 1fr; gap: 10px; }
.symopt { display: flex; align-items: center; gap: 10px; min-height: 52px; padding: 10px 14px; border: 1.5px solid var(--line); border-radius: 12px; cursor: pointer; background: var(--paper); }
.symopt input { width: 20px; height: 20px; margin: 0; flex: none; accent-color: var(--accent); }
.symopt:has(input:checked) { border-color: var(--accent); background: var(--accent-soft); font-weight: 700; }

.stephead { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 4px 12px; }
.progress { margin: 0 0 12px; font-size: 14px; color: var(--good); font-weight: 700; }
.steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.step { border: 1px solid var(--line); border-left: 4px solid var(--line); border-radius: 12px; padding: 4px 12px 10px; }
.step.done { border-left-color: var(--good); }
.step label { display: flex; align-items: flex-start; gap: 10px; min-height: 44px; padding-top: 8px; cursor: pointer; font-weight: 700; }
.step input { width: 22px; height: 22px; margin: 2px 0 0; flex: none; accent-color: var(--good); }
.step.done .st-title { text-decoration: line-through; text-decoration-color: var(--good); }
.st-body { margin: 4px 0 0 32px; color: var(--ink-2); font-size: 15px; }

.msg { display: block; width: 100%; min-width: 0; margin: 12px 0; padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--bg); color: var(--ink); font-size: 15px; line-height: 1.55; resize: vertical; }
.btn { min-height: 48px; padding: 10px 18px; border: 0; border-radius: 12px; background: var(--accent); color: var(--accent-ink); font-weight: 700; cursor: pointer; width: 100%; }
.btn.ghost { background: transparent; color: var(--ink-2); border: 1px solid var(--line); font-weight: 600; }
.actions { margin: 16px 0; }

.guide details { border-top: 1px solid var(--line); padding: 4px 0; }
.guide summary { min-height: 44px; display: flex; align-items: center; cursor: pointer; font-weight: 600; }
.guide details p { margin: 0 0 10px; color: var(--ink-2); }
.disclaimer { margin: 8px 0 24px; padding: 10px 12px; border: 1px dashed var(--line); border-radius: 10px; font-size: 14px; color: var(--ink-2); }
.foot { padding-bottom: 32px; font-size: 14px; color: var(--ink-2); }
.foot a { color: var(--accent); }

/* 넓은 화면(1280px 이상)에서만 두 칸. 1279px 까지는 한 칸(갤럭시 폴드 펼침 포함) */
@media (min-width: 1280px) {
  .wrap, .hero, .foot { max-width: 1180px; }
  .grid { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); gap: 0 24px; align-items: start; }
  .syms { grid-template-columns: 1fr 1fr; }
  .ask { position: sticky; top: 16px; }
}
@media (min-width: 600px) and (max-width: 1279px) {
  .syms { grid-template-columns: 1fr 1fr; }
  .btn { width: auto; min-width: 220px; }
}
@media (prefers-reduced-motion: no-preference) { .symopt, .step { transition: border-color .15s, background-color .15s; } }