:root {
  --paper: #f3f5f4;
  --surface: #ffffff;
  --ink: #16211d;
  --muted: #586760;
  --line: #d3dbd7;
  --green: #0e6b50;
  --green-soft: #e3efe9;
  --amber: #e9a23b;
  --red: #b3402f;
  --radius-s: 6px;
  --radius-m: 10px;
  --font: 'Pretendard Variable', Pretendard, -apple-system, BlinkMacSystemFont, 'Apple SD Gothic Neo', 'Malgun Gothic', system-ui, sans-serif;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0f1513;
    --surface: #18201d;
    --ink: #e6ede9;
    --muted: #9badA4;
    --line: #2c3833;
    --green: #4fc79c;
    --green-soft: #183028;
    --amber: #f0b45a;
    --red: #f08a78;
    color-scheme: dark;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
  word-break: keep-all;
  overflow-wrap: anywhere;
}

a {
  color: var(--green);
  text-underline-offset: 3px;
}

:focus-visible {
  outline: 3px solid var(--amber);
  outline-offset: 2px;
}

.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 16px;
}

.skip {
  position: absolute;
  left: -9999px;
}
.skip:focus {
  left: 16px;
  top: 8px;
  z-index: 10;
  background: var(--surface);
  padding: 8px 12px;
}

.sr {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

/* 머리글 */
.top {
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}
.top-in {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 60px;
  flex-wrap: wrap;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 800;
  font-size: 20px;
  letter-spacing: -0.02em;
  color: var(--green);
  text-decoration: none;
}
.top nav {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}
.top nav a {
  color: var(--ink);
  text-decoration: none;
  padding: 6px 10px;
  border-radius: var(--radius-s);
  font-weight: 600;
  font-size: 15px;
}
.top nav a:hover {
  background: var(--green-soft);
}
.top nav a[aria-current='page'] {
  color: var(--green);
  background: var(--green-soft);
}

main {
  padding-top: 24px;
  padding-bottom: 56px;
}

h1 {
  font-size: clamp(28px, 4.6vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.03em;
  margin: 8px 0 8px;
  font-weight: 800;
}
.lead {
  color: var(--muted);
  font-size: 17px;
  margin: 0 0 24px;
  max-width: 62ch;
}

.crumbs {
  display: flex;
  gap: 6px;
  font-size: 14px;
  color: var(--muted);
}
.crumbs a {
  color: var(--muted);
}

/* 계산기 */
.calc {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}

.calc-form {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  padding: 20px;
}

.field {
  margin-bottom: 18px;
}
.field[hidden] {
  display: none;
}
.lbl {
  display: block;
  font-weight: 700;
  font-size: 15px;
  margin-bottom: 6px;
}
.help {
  margin: 6px 0 0;
  font-size: 13.5px;
  color: var(--muted);
  line-height: 1.5;
}

.num {
  display: flex;
  align-items: stretch;
  border: 1.5px solid var(--line);
  border-radius: var(--radius-s);
  background: var(--paper);
  overflow: hidden;
}
.num:focus-within {
  border-color: var(--green);
}
.num input {
  flex: 1;
  min-width: 0;
  border: 0;
  background: transparent;
  color: var(--ink);
  font: inherit;
  font-size: 20px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  padding: 10px 12px;
  text-align: right;
  outline: none;
}
.unit {
  display: flex;
  align-items: center;
  padding: 0 12px 0 0;
  color: var(--muted);
  font-weight: 600;
  white-space: nowrap;
}

select,
input[type='date'] {
  width: 100%;
  font: inherit;
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
  background: var(--paper);
  border: 1.5px solid var(--line);
  border-radius: var(--radius-s);
  padding: 10px 12px;
  min-height: 48px;
}
select:focus,
input[type='date']:focus {
  border-color: var(--green);
  outline: none;
}

.seg {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.seg label {
  flex: 1 1 auto;
  position: relative;
}
.seg input {
  position: absolute;
  opacity: 0;
  inset: 0;
}
.seg span {
  display: block;
  text-align: center;
  padding: 10px 12px;
  border: 1.5px solid var(--line);
  border-radius: var(--radius-s);
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  background: var(--paper);
}
.seg input:checked + span {
  border-color: var(--green);
  background: var(--green-soft);
  color: var(--green);
}
.seg input:focus-visible + span {
  outline: 3px solid var(--amber);
  outline-offset: 2px;
}

.field-check {
  margin-bottom: 10px;
}
.check {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  cursor: pointer;
  font-size: 15px;
}
.check input {
  width: 20px;
  height: 20px;
  margin: 2px 0 0;
  accent-color: var(--green);
  flex: none;
}

.actions {
  display: flex;
  gap: 8px;
  margin-top: 22px;
}
button {
  font: inherit;
  cursor: pointer;
}
.actions button {
  flex: 1;
  min-height: 50px;
  border-radius: var(--radius-s);
  border: 1.5px solid var(--green);
  background: var(--green);
  color: var(--surface);
  font-weight: 700;
  font-size: 17px;
}
.actions .ghost {
  flex: 0 0 auto;
  padding: 0 16px;
  background: transparent;
  color: var(--green);
}

/* 결과: 영수증 */
.calc-out {
  position: sticky;
  top: 16px;
}
.receipt {
  position: relative;
  background: var(--surface);
  padding: 24px 22px 30px;
  border-radius: var(--radius-m) var(--radius-m) 0 0;
  box-shadow: 0 1px 0 var(--line), 0 12px 30px -18px rgba(14, 50, 38, 0.35);
  font-variant-numeric: tabular-nums;
}
/* 아래쪽 톱니 */
.receipt::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -9px;
  height: 10px;
  background: linear-gradient(-45deg, transparent 6px, var(--surface) 0) 0 0 / 12px 10px repeat-x, linear-gradient(45deg, transparent 6px, var(--surface) 0) 0 0 / 12px 10px repeat-x;
}
.r-label {
  margin: 0;
  color: var(--muted);
  font-weight: 600;
  font-size: 15px;
}
.r-total {
  margin: 4px 0 0;
  font-size: clamp(34px, 6vw, 46px);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  display: inline-block;
  background: linear-gradient(transparent 68%, color-mix(in srgb, var(--amber) 45%, transparent) 0);
}
.r-sub {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 15px;
}
.r-rows {
  list-style: none;
  margin: 20px 0 0;
  padding: 16px 0 0;
  border-top: 2px dashed var(--line);
}
.r-rows li {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 5px 0;
  font-size: 15px;
}
.r-rows li span {
  color: var(--muted);
}
.r-rows li b {
  font-weight: 600;
  text-align: right;
  white-space: nowrap;
}
.r-rows li.sub {
  padding-left: 14px;
  font-size: 14px;
}
.r-rows li.minus b {
  color: var(--red);
}
.r-rows li.strong {
  border-top: 1px solid var(--line);
  margin-top: 4px;
  padding-top: 9px;
}
.r-rows li.strong span,
.r-rows li.strong b {
  color: var(--ink);
  font-weight: 800;
}
.r-rows li.div {
  border-top: 2px dashed var(--line);
  margin: 8px 0 4px;
  padding: 0;
}
.r-notes {
  margin: 18px 0 0;
  padding: 14px 0 0 18px;
  border-top: 2px dashed var(--line);
  color: var(--muted);
  font-size: 13.5px;
  line-height: 1.55;
}
.r-notes li + li {
  margin-top: 4px;
}
.receipt-error p {
  margin: 0;
  color: var(--red);
  font-weight: 700;
}

.rtable {
  margin-top: 16px;
  border-top: 2px dashed var(--line);
  padding-top: 12px;
}
.rtable summary {
  cursor: pointer;
  font-weight: 700;
  color: var(--green);
}
.rtable .tscroll {
  max-height: 360px;
  overflow: auto;
  margin-top: 10px;
}

.link-btn {
  display: block;
  margin: 22px auto 0;
  background: none;
  border: 0;
  color: var(--green);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
  padding: 8px;
}

/* 표 */
.tscroll {
  overflow-x: auto;
}
table {
  border-collapse: collapse;
  width: 100%;
  font-size: 14.5px;
  font-variant-numeric: tabular-nums;
}
th,
td {
  padding: 8px 10px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  white-space: nowrap;
}
th {
  font-weight: 700;
  background: var(--green-soft);
  position: sticky;
  top: 0;
}

/* 설명글 */
.prose {
  max-width: 720px;
  margin-top: 56px;
}
.prose h2 {
  font-size: 23px;
  letter-spacing: -0.02em;
  margin: 40px 0 12px;
  line-height: 1.35;
}
.prose p,
.prose ul {
  margin: 0 0 14px;
}
.prose li + li {
  margin-top: 4px;
}
.prose .tscroll {
  margin: 4px 0 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
}
.prose td {
  white-space: normal;
  min-width: 90px;
}
.links {
  columns: 2;
}
.faq details {
  border-bottom: 1px solid var(--line);
  padding: 12px 0;
}
.faq summary {
  cursor: pointer;
  font-weight: 700;
}
.faq p {
  margin: 8px 0 0;
  color: var(--muted);
}
.asof {
  margin-top: 32px;
  font-size: 14px;
  color: var(--muted);
}
.contact-mail {
  font-size: 20px;
  font-weight: 700;
}

/* 목록 */
.list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}
.list li {
  border-bottom: 1px solid var(--line);
  padding: 14px 0;
  display: grid;
  grid-template-columns: minmax(160px, 240px) 1fr;
  gap: 4px 24px;
  align-items: baseline;
}
.list a {
  font-weight: 700;
  font-size: 18px;
  text-decoration: none;
}
.list a:hover {
  text-decoration: underline;
}
.list span {
  color: var(--muted);
  font-size: 15px;
}

.hero {
  padding: 28px 0 8px;
}
.hero h1 {
  font-size: clamp(36px, 7vw, 64px);
  letter-spacing: -0.045em;
  line-height: 1.08;
}
.search input {
  width: 100%;
  max-width: 560px;
  font: inherit;
  font-size: 19px;
  padding: 14px 16px;
  border: 2px solid var(--ink);
  border-radius: var(--radius-m);
  background: var(--surface);
  color: var(--ink);
}
.search input:focus {
  outline: none;
  border-color: var(--green);
}
.empty {
  color: var(--muted);
}
.group {
  margin-top: 40px;
}
.group h2 {
  font-size: 15px;
  margin: 0 0 8px;
}
.group h2 a {
  color: var(--muted);
  text-decoration: none;
}

.related {
  max-width: 720px;
  margin-top: 48px;
}
.related h2 {
  font-size: 20px;
}
.related ul {
  list-style: none;
  padding: 0;
  margin: 0;
  border-top: 1px solid var(--line);
}
.related li {
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}
.related a {
  font-weight: 700;
  display: block;
}
.related span {
  color: var(--muted);
  font-size: 14.5px;
}

.foot {
  border-top: 1px solid var(--line);
  padding: 28px 0 40px;
  color: var(--muted);
  font-size: 14px;
}
.foot nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 18px;
  margin-bottom: 10px;
}
.foot a {
  color: var(--muted);
}

@media (max-width: 860px) {
  .calc {
    grid-template-columns: minmax(0, 1fr);
  }
  .calc-out {
    position: static;
  }
  .list li {
    grid-template-columns: 1fr;
  }
  .links {
    columns: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto !important;
  }
}