/* =========================================================
 *  SignMaker - 스타일
 * ========================================================= */
:root {
  --bg: #f5f6f8;
  --surface: #ffffff;
  --surface-2: #f0f2f5;
  --line: #e2e6ec;
  --line-strong: #cdd4de;
  --text: #16202c;
  --text-dim: #5c6a7a;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --danger: #c0392b;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 1px 2px rgba(16, 26, 40, .06), 0 8px 24px rgba(16, 26, 40, .07);
  --wrap: 1180px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --surface: #161b22;
    --surface-2: #1c232d;
    --line: #262d38;
    --line-strong: #38414f;
    --text: #e6edf3;
    --text-dim: #9aa7b6;
    --accent: #4f8cff;
    --accent-dark: #6ea0ff;
    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 8px 24px rgba(0, 0, 0, .35);
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Noto Sans KR", -apple-system, BlinkMacSystemFont, "Segoe UI",
    "Malgun Gothic", "Apple SD Gothic Neo", sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 20px; }

a { color: var(--accent); }

.skip {
  position: absolute; left: -9999px; top: 0;
  background: var(--accent); color: #fff; padding: 10px 16px; z-index: 100;
}
.skip:focus { left: 8px; top: 8px; border-radius: 8px; }

/* ---------- 헤더 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 40;
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.header__inner { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { display: inline-flex; align-items: center; gap: 8px; text-decoration: none; color: var(--text); font-weight: 900; font-size: 18px; }
.brand__mark { font-size: 20px; }
.site-nav { display: flex; gap: 20px; }
.site-nav a { color: var(--text-dim); text-decoration: none; font-size: 14.5px; font-weight: 500; }
.site-nav a:hover { color: var(--accent); }

/* ---------- 히어로 ---------- */
.hero { padding: 46px 0 28px; text-align: center; }
.hero__title {
  margin: 0 0 12px; font-size: clamp(27px, 4.6vw, 42px); font-weight: 900; letter-spacing: -.6px;
}
.hero__sub { margin: 0 auto; max-width: 640px; color: var(--text-dim); font-size: 16px; }
.hero__sub strong { color: var(--text); }
.hero__badges {
  list-style: none; display: flex; flex-wrap: wrap; gap: 8px;
  justify-content: center; padding: 0; margin: 20px 0 0;
}
.hero__badges li {
  font-size: 13px; font-weight: 500; color: var(--text-dim);
  border: 1px solid var(--line); background: var(--surface);
  padding: 5px 12px; border-radius: 999px;
}

/* ---------- 광고 ---------- */
.ad-slot {
  margin: 26px auto; min-height: 90px; display: flex; align-items: center; justify-content: center;
  overflow: hidden;
}

/* ---------- 도구 레이아웃 ---------- */
.tool { padding: 8px 0 12px; }
.tool__grid { display: grid; grid-template-columns: 300px 1fr; gap: 22px; align-items: start; }

.panel {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow); padding: 18px;
  position: sticky; top: 76px;
}
.field + .field { margin-top: 20px; padding-top: 20px; border-top: 1px solid var(--line); }
.field__label {
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
  margin: 0 0 10px; font-size: 13px; font-weight: 700; letter-spacing: .2px;
  color: var(--text-dim); text-transform: none;
}
.field__label output { font-variant-numeric: tabular-nums; color: var(--accent); font-weight: 700; }
.field__hint { margin: 9px 0 0; font-size: 12.5px; color: var(--text-dim); line-height: 1.55; }

/* 펜 선택 */
.pen-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 7px; }
.pen-chip {
  display: flex; flex-direction: column; align-items: center; gap: 3px;
  padding: 10px 4px; border: 1px solid var(--line); background: var(--surface-2);
  border-radius: var(--radius-sm); cursor: pointer; color: var(--text);
  font-family: inherit; font-size: 12.5px; font-weight: 500;
  transition: border-color .15s, background .15s, transform .08s;
}
.pen-chip:hover { border-color: var(--line-strong); }
.pen-chip:active { transform: scale(.97); }
.pen-chip.is-active {
  border-color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, var(--surface));
  color: var(--accent); font-weight: 700;
}
.pen-chip__icon { font-size: 19px; line-height: 1; }

/* 미리보기 */
.preview {
  width: 100%; height: 86px; display: block;
  border: 1px solid var(--line); border-radius: var(--radius-sm);
  background:
    linear-gradient(45deg, #e9edf3 25%, transparent 25%, transparent 75%, #e9edf3 75%) 0 0/14px 14px,
    linear-gradient(45deg, #e9edf3 25%, transparent 25%, transparent 75%, #e9edf3 75%) 7px 7px/14px 14px,
    #ffffff;
}

/* 색상 */
.color-list { display: grid; grid-template-columns: repeat(8, 1fr); gap: 6px; }
.swatch {
  aspect-ratio: 1; border-radius: 50%; border: 2px solid var(--line);
  background: var(--sw); cursor: pointer; padding: 0;
  transition: transform .1s, box-shadow .1s;
}
.swatch:hover { transform: scale(1.12); }
.swatch.is-active { box-shadow: 0 0 0 2px var(--surface), 0 0 0 4px var(--accent); }
.custom-color {
  display: flex; align-items: center; justify-content: space-between;
  margin-top: 12px; font-size: 13px; color: var(--text-dim);
}
.custom-color input[type=color] {
  width: 46px; height: 30px; padding: 0; border: 1px solid var(--line);
  border-radius: 7px; background: none; cursor: pointer;
}

/* 슬라이더 */
input[type=range] {
  width: 100%; -webkit-appearance: none; appearance: none;
  height: 5px; border-radius: 99px; background: var(--surface-2);
  border: 1px solid var(--line); outline: none; margin: 4px 0;
}
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 18px; height: 18px; border-radius: 50%;
  background: var(--accent); border: 3px solid var(--surface);
  box-shadow: 0 1px 4px rgba(0, 0, 0, .3); cursor: pointer;
}
input[type=range]::-moz-range-thumb {
  width: 14px; height: 14px; border-radius: 50%; background: var(--accent);
  border: 3px solid var(--surface); cursor: pointer;
}

.check { display: flex; align-items: center; gap: 8px; font-size: 13.5px; color: var(--text-dim); cursor: pointer; }
.check + .check { margin-top: 7px; }
.check input { accent-color: var(--accent); width: 15px; height: 15px; }

/* ---------- 서명 패드 ----------
 * 잉크는 대부분 어두운 색이므로 패드는 다크 모드에서도 '종이'처럼 밝게 고정합니다.
 */
.pad-col { min-width: 0; }
.pad {
  --paper: #ffffff;
  --paper-2: #e9edf3;
  --paper-line: #b9c3d1;
  --paper-text: #8794a5;

  position: relative; width: 100%; height: min(46vh, 380px); min-height: 260px;
  background: var(--paper); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden;
  touch-action: none;
}
.pad.is-checker {
  background:
    linear-gradient(45deg, var(--paper-2) 25%, transparent 25%, transparent 75%, var(--paper-2) 75%) 0 0/18px 18px,
    linear-gradient(45deg, var(--paper-2) 25%, transparent 25%, transparent 75%, var(--paper-2) 75%) 9px 9px/18px 18px,
    var(--paper);
}
.pad::after {
  content: ""; position: absolute; left: 8%; right: 8%; bottom: 26%;
  border-bottom: 1px dashed var(--paper-line); opacity: 0; transition: opacity .2s;
  pointer-events: none;
}
.pad.has-guide::after { opacity: 1; }
.pad__layer { position: absolute; inset: 0; display: block; }
.pad__layer--live { cursor: crosshair; touch-action: none; }
.pad__placeholder {
  position: absolute; inset: 0; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 5px;
  pointer-events: none; color: var(--paper-text); transition: opacity .25s;
}
.pad__placeholder span { font-size: 17px; font-weight: 700; }
.pad__placeholder small { font-size: 12.5px; opacity: .8; }
.pad__placeholder.is-hidden { opacity: 0; }

/* ---------- 액션 ---------- */
.actions {
  display: flex; flex-wrap: wrap; gap: 12px 18px; align-items: center;
  justify-content: space-between; margin-top: 14px;
}
.actions__group { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 14px; }
.actions__group--export { color: var(--text-dim); font-size: 13px; }
.mini { display: inline-flex; align-items: center; gap: 7px; font-size: 13px; color: var(--text-dim); }
.mini output { color: var(--accent); font-weight: 700; font-variant-numeric: tabular-nums; }
.mini input[type=range] { width: 96px; }
.check--inline { display: inline-flex; }

select, .btn {
  font-family: inherit; font-size: 14px; border-radius: var(--radius-sm);
  border: 1px solid var(--line); background: var(--surface); color: var(--text);
  cursor: pointer;
}
select { padding: 6px 8px; font-size: 13px; }

.btn {
  padding: 9px 16px; font-weight: 700; transition: background .15s, border-color .15s, transform .08s, opacity .15s;
}
.btn:hover:not(:disabled) { border-color: var(--line-strong); background: var(--surface-2); }
.btn:active:not(:disabled) { transform: translateY(1px); }
.btn:disabled { opacity: .42; cursor: not-allowed; }
.btn--ghost { background: transparent; }
.btn--danger { color: var(--danger); }
.btn--primary {
  background: var(--accent); border-color: var(--accent); color: #fff;
}
.btn--primary:hover:not(:disabled) { background: var(--accent-dark); border-color: var(--accent-dark); }

.download { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 16px; }
.download .btn { flex: 1 1 auto; min-width: 140px; }

.privacy-note {
  margin: 14px 0 0; font-size: 12.5px; color: var(--text-dim);
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius-sm); padding: 10px 14px;
}

/* ---------- 콘텐츠 ---------- */
.content { padding: 44px 0; }
.content--alt { background: var(--surface); border-block: 1px solid var(--line); }
.content h2 {
  margin: 0 0 26px; font-size: clamp(21px, 3vw, 27px); font-weight: 900; letter-spacing: -.4px;
}
.content h3 { margin: 0 0 6px; font-size: 16px; font-weight: 700; }
.content p { margin: 0; color: var(--text-dim); font-size: 15px; }
.content em { font-style: normal; color: var(--text); font-weight: 500; }

.steps { counter-reset: s; list-style: none; padding: 0; margin: 0; display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.steps li {
  counter-increment: s; position: relative; padding: 20px 20px 20px 22px;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
}
.content--alt .steps li { background: var(--bg); }
.steps li::before {
  content: counter(s); position: absolute; top: -12px; left: 18px;
  width: 26px; height: 26px; border-radius: 50%; background: var(--accent); color: #fff;
  font-size: 13px; font-weight: 700; display: grid; place-items: center;
}

.cards { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(255px, 1fr)); }
.cards--two { grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }
.card {
  background: var(--bg); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 18px;
}
.content:not(.content--alt) .card { background: var(--surface); }

/* FAQ */
.faq { display: grid; gap: 10px; }
.faq__item { background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.content:not(.content--alt) .faq__item { background: var(--surface); }
.faq__q {
  width: 100%; text-align: left; padding: 16px 46px 16px 18px; position: relative;
  background: none; border: 0; cursor: pointer; color: var(--text);
  font-family: inherit; font-size: 15.5px; font-weight: 700; line-height: 1.5;
}
.faq__q::after {
  content: "+"; position: absolute; right: 18px; top: 50%; transform: translateY(-50%);
  font-size: 20px; font-weight: 400; color: var(--text-dim); transition: transform .2s;
}
.faq__item.is-open .faq__q::after { transform: translateY(-50%) rotate(45deg); }
.faq__a { display: none; padding: 0 18px 18px; }
.faq__item.is-open .faq__a { display: block; }
.faq__a p { font-size: 14.5px; }

/* ---------- 푸터 ---------- */
.site-footer { border-top: 1px solid var(--line); background: var(--surface); padding: 30px 0; margin-top: 10px; }
.footer__inner { display: flex; flex-direction: column; align-items: center; gap: 10px; text-align: center; }
.footer__brand { margin: 0; font-weight: 900; }
.footer__nav { display: flex; flex-wrap: wrap; gap: 18px; justify-content: center; }
.footer__nav a { color: var(--text-dim); text-decoration: none; font-size: 14px; }
.footer__nav a:hover { color: var(--accent); text-decoration: underline; }
.footer__copy { margin: 0; font-size: 12.5px; color: var(--text-dim); }

/* ---------- 토스트 ---------- */
.toast {
  position: fixed; left: 50%; bottom: 26px; transform: translate(-50%, 20px);
  background: #16202c; color: #fff; padding: 12px 20px; border-radius: 999px;
  font-size: 14px; font-weight: 500; box-shadow: 0 10px 30px rgba(0, 0, 0, .3);
  opacity: 0; pointer-events: none; transition: opacity .22s, transform .22s; z-index: 90;
  max-width: calc(100% - 32px); text-align: center;
}
.toast.is-on { opacity: 1; transform: translate(-50%, 0); }

/* ---------- 법적 고지 페이지 ---------- */
.legal { padding: 40px 0 60px; }
.legal .wrap { max-width: 820px; }
.legal h1 { font-size: 28px; font-weight: 900; margin: 0 0 8px; }
.legal .updated { color: var(--text-dim); font-size: 13.5px; margin: 0 0 28px; }
.legal h2 { font-size: 18px; font-weight: 700; margin: 30px 0 10px; }
.legal p, .legal li { color: var(--text-dim); font-size: 15px; }
.legal ul, .legal ol { padding-left: 20px; }
.legal li { margin: 5px 0; }
.legal strong { color: var(--text); }

/* ---------- 반응형 ---------- */
@media (max-width: 900px) {
  /* 좁은 화면에서는 서명 패드를 먼저 보여 준다 */
  .tool__grid { grid-template-columns: 1fr; }
  .pad-col { order: 1; }
  .panel { order: 2; position: static; }
  .pen-list { grid-template-columns: repeat(4, 1fr); }
  .pad { height: min(52vh, 330px); }
}
@media (max-width: 560px) {
  .site-nav { display: none; }
  .hero { padding: 30px 0 20px; }
  .pen-list { grid-template-columns: repeat(3, 1fr); }
  .download .btn { flex: 1 1 100%; }
  .actions { gap: 10px; }
  .pad__placeholder small { display: none; }
}