:root {
  --navy: #10233f;
  --navy-2: #19365f;
  --orange: #f15a24;
  --orange-dark: #d94412;
  --ink: #162033;
  --muted: #5f6b7a;
  --line: #dce2ea;
  --soft: #f5f7fa;
  --warning: #fff5f1;
  --white: #ffffff;
  --radius: 6px;
  font-family: "Apple SD Gothic Neo", "Noto Sans KR", "Malgun Gothic", sans-serif;
  color: var(--ink);
  background: var(--soft);
}

* { box-sizing: border-box; }
html { min-width: 0; scroll-behavior: smooth; }
body { margin: 0; min-width: 0; overflow-x: hidden; background: var(--soft); color: var(--ink); }
body, main, section, article, form, fieldset, div, ul, li, a, p, h1, h2, h3, code, output { min-width: 0; }
body, p, li, a, code, output, dd, dt, span, strong { overflow-wrap: anywhere; word-break: normal; }
button, input, select, textarea { font: inherit; }
a { color: var(--navy-2); text-underline-offset: 0.15em; }
a:hover { color: var(--orange-dark); }
img, svg { display: block; max-width: 100%; height: auto; }

.skip-link {
  position: absolute;
  left: 0.75rem;
  top: -5rem;
  z-index: 999;
  padding: 0.75rem 1rem;
  background: var(--white);
  border: 2px solid var(--orange);
}
.skip-link:focus { top: 0.75rem; }

.site-header {
  background: var(--navy);
  color: var(--white);
  border-bottom: 4px solid var(--orange);
}
.header-inner {
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.brand { color: var(--white); font-weight: 800; text-decoration: none; }
.header-nav { display: flex; gap: 0.85rem; flex-wrap: wrap; justify-content: flex-end; }
.header-nav a { color: var(--white); font-size: 0.93rem; }

.tool-shell { width: min(1180px, calc(100% - 2rem)); margin: 0 auto; padding: 2rem 0 4rem; }
.tool-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(260px, 0.85fr);
  gap: 1.5rem;
  align-items: center;
  padding: 1.5rem;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 10px 28px rgba(16, 35, 63, 0.08);
}
.eyebrow { margin: 0 0 0.55rem; color: var(--orange-dark); font-weight: 800; letter-spacing: 0.02em; }
h1 { margin: 0; color: var(--navy); font-size: clamp(1.75rem, 4.8vw, 3rem); line-height: 1.15; }
.lead { color: var(--muted); font-size: 1.06rem; line-height: 1.75; }
.meta-list { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 1rem 0 0; padding: 0; list-style: none; }
.meta-list li { padding: 0.38rem 0.62rem; border-radius: 999px; background: var(--soft); border: 1px solid var(--line); font-size: 0.88rem; }
.formula-figure { margin: 0; border-radius: var(--radius); overflow: hidden; background: var(--soft); }
.formula-figure figcaption { padding: 0.65rem 0.8rem; color: var(--muted); font-size: 0.84rem; }

.notice-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; margin-top: 1rem; }
.notice {
  padding: 1rem;
  border: 1px solid var(--line);
  border-left: 5px solid var(--navy-2);
  border-radius: var(--radius);
  background: var(--white);
}
.notice.warning { background: var(--warning); border-left-color: var(--orange); }
.notice h2 { font-size: 1.05rem; margin: 0 0 0.45rem; color: var(--navy); }
.notice p { margin: 0; color: var(--muted); line-height: 1.65; }

.calculator-layout { display: grid; grid-template-columns: minmax(0, 1fr) minmax(300px, 0.76fr); gap: 1.25rem; margin-top: 1.25rem; align-items: start; }
.panel { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.25rem; }
.panel h2 { margin: 0 0 1rem; color: var(--navy); }
fieldset { border: 0; padding: 0; margin: 0 0 1.1rem; }
legend { font-weight: 800; color: var(--navy); margin-bottom: 0.55rem; }
.option-row { display: flex; flex-wrap: wrap; gap: 0.55rem; }
.option-card { position: relative; }
.option-card input { position: absolute; opacity: 0; pointer-events: none; }
.option-card span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.58rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--soft);
  cursor: pointer;
  font-weight: 700;
}
.option-card input:checked + span { color: var(--white); background: var(--navy-2); border-color: var(--navy-2); }
.option-card input:focus-visible + span { outline: 3px solid rgba(241, 90, 36, 0.45); outline-offset: 2px; }
.mode-note { margin: -0.4rem 0 1.1rem; color: var(--muted); font-size: 0.9rem; line-height: 1.6; }

.field-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.85rem; }
.field-card { position: relative; padding: 0.9rem; border: 1px solid var(--line); border-radius: var(--radius); background: var(--white); }
.field-card.is-target-card { border-color: var(--orange); background: var(--warning); }
.field-card label { display: block; font-weight: 800; margin-bottom: 0.45rem; color: var(--navy); }
.input-with-unit { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: stretch; }
.input-with-unit input, .field-card > input, .field-card select {
  width: 100%;
  min-height: 46px;
  padding: 0.7rem 0.72rem;
  border: 1px solid #aeb8c6;
  border-radius: var(--radius);
  color: var(--ink);
  background: var(--white);
}
.input-with-unit input { border-radius: var(--radius) 0 0 var(--radius); }
.input-with-unit select, .input-with-unit .unit-static {
  min-width: 74px;
  min-height: 46px;
  border: 1px solid #aeb8c6;
  border-left: 0;
  border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--soft);
  padding: 0.65rem;
  display: grid;
  place-items: center;
}
input.is-target { background: #fffaf7; border-style: dashed; }
input[aria-invalid="true"] { border-color: #b42318; box-shadow: 0 0 0 2px rgba(180, 35, 24, 0.12); }
.field-help { margin: 0.42rem 0 0; color: var(--muted); font-size: 0.82rem; line-height: 1.5; }
.field-error { min-height: 1.2em; margin: 0.28rem 0 0; color: #9b1c1c; font-size: 0.84rem; font-weight: 700; }
.target-badge { position: absolute; top: 0.65rem; right: 0.65rem; color: var(--orange-dark); font-size: 0.76rem; font-weight: 800; }
.measurement-group { padding: 1rem; border: 1px solid var(--line); border-radius: var(--radius); }
.measurement-group.is-disabled { opacity: 0.52; background: var(--soft); }
.measurement-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0.7rem; }
.measurement-grid .field-card > input { width: 100%; min-height: 46px; padding: 0.7rem 0.72rem; border: 1px solid #aeb8c6; border-radius: var(--radius); }
.compact-select { display: flex; align-items: center; gap: 0.6rem; margin-top: 0.75rem; font-weight: 800; }
.compact-select select { min-height: 42px; padding: 0.5rem 2rem 0.5rem 0.65rem; border: 1px solid #aeb8c6; border-radius: var(--radius); background: var(--white); }

.settings-row { display: grid; grid-template-columns: minmax(0, 1fr) minmax(140px, 0.4fr); gap: 0.85rem; margin-top: 0.85rem; }
.settings-row label { display: block; font-weight: 800; margin-bottom: 0.4rem; }
.settings-row select { width: 100%; min-height: 44px; border: 1px solid #aeb8c6; border-radius: var(--radius); padding: 0.55rem; background: var(--white); }
.action-row { display: flex; flex-wrap: wrap; gap: 0.65rem; margin-top: 1rem; }
.button {
  min-height: 44px;
  border: 0;
  border-radius: var(--radius);
  padding: 0.7rem 1rem;
  font-weight: 800;
  cursor: pointer;
}
.button.primary { background: var(--orange); color: var(--white); }
.button.primary:hover { background: var(--orange-dark); }
.button.secondary { background: var(--navy-2); color: var(--white); }
.button.ghost { background: var(--soft); color: var(--navy); border: 1px solid var(--line); }
.button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible, a:focus-visible { outline: 3px solid rgba(241, 90, 36, 0.45); outline-offset: 2px; }

.warning-box { margin-top: 0.85rem; padding: 0.85rem; background: var(--warning); border: 1px solid #ffc9b8; border-radius: var(--radius); }
.warning-box ul { margin: 0.45rem 0 0; padding-left: 1.2rem; }

.result-panel { position: sticky; top: 1rem; }
.result-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 0.75rem; }
.status-pill { display: inline-flex; padding: 0.28rem 0.55rem; border-radius: 999px; background: var(--warning); color: var(--orange-dark); font-size: 0.78rem; font-weight: 800; }
.result-number { display: flex; align-items: baseline; gap: 0.45rem; flex-wrap: wrap; margin: 0.75rem 0; color: var(--navy); }
.result-number output { font-size: clamp(2rem, 7vw, 3.6rem); line-height: 1; font-weight: 900; }
.result-number span { font-size: 1.15rem; font-weight: 800; }
.result-section { border-top: 1px solid var(--line); padding-top: 0.85rem; margin-top: 0.85rem; }
.result-section h3 { margin: 0 0 0.42rem; color: var(--navy); font-size: 1rem; }
.result-section p, .result-section li { color: var(--muted); line-height: 1.62; }
.formula-line { padding: 0.62rem; background: var(--soft); border-radius: var(--radius); font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; color: var(--ink) !important; }
.group-result { border-top: 2px solid var(--navy-2); margin-top: 1rem; padding-top: 1rem; }
.group-result h3 { margin: 0 0 0.7rem; color: var(--navy); }
.metric-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0.55rem; margin: 0; }
.metric-list div { padding: 0.7rem; background: var(--soft); border-radius: var(--radius); }
.metric-list dt { color: var(--muted); font-size: 0.82rem; font-weight: 700; }
.metric-list dd { margin: 0.25rem 0 0; color: var(--navy); font-weight: 900; }
.phase-results { margin: 0.8rem 0; }
.phase-result-row { display: grid; grid-template-columns: 2.5rem minmax(90px, 1fr) minmax(7rem, auto); align-items: center; gap: 0.55rem; margin: 0.42rem 0; font-size: 0.86rem; }
.phase-bar { height: 12px; overflow: hidden; border-radius: 999px; background: #dce2ea; }
.phase-bar-fill { display: block; height: 100%; border-radius: inherit; background: var(--orange); }
.table-scroll { width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; }
.table-scroll table { width: 100%; min-width: 420px; border-collapse: collapse; }
.table-scroll th, .table-scroll td { padding: 0.55rem; border: 1px solid var(--line); text-align: left; }
.table-scroll th { color: var(--navy); background: var(--soft); }

.record-section, .source-section { margin-top: 1.25rem; }
.record-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.85rem; }
.record-field label { display: block; font-weight: 800; margin-bottom: 0.38rem; }
.record-field input, .record-field textarea { width: 100%; border: 1px solid #aeb8c6; border-radius: var(--radius); padding: 0.68rem; background: var(--white); }
.record-field textarea { min-height: 96px; resize: vertical; }
.source-list { margin: 0; padding-left: 1.15rem; }
.source-list li { margin: 0.55rem 0; line-height: 1.65; }
.contact-box { margin-top: 1rem; padding: 1rem; background: var(--navy); color: var(--white); border-radius: var(--radius); }
.contact-box a { color: var(--white); font-weight: 800; }

.site-footer { padding: 1.5rem 1rem; color: var(--muted); text-align: center; border-top: 1px solid var(--line); background: var(--white); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

@media (max-width: 800px) {
  .tool-hero, .calculator-layout { grid-template-columns: minmax(0, 1fr); }
  .result-panel { position: static; }
  .notice-grid { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 560px) {
  .header-inner { width: min(100% - 1rem, 1180px); align-items: flex-start; flex-direction: column; padding: 0.8rem 0; }
  .header-nav { justify-content: flex-start; }
  .tool-shell { width: min(100% - 1rem, 1180px); padding-top: 0.75rem; }
  .tool-hero, .panel { padding: 1rem; }
  .field-grid, .settings-row, .record-grid, .measurement-grid, .metric-list { grid-template-columns: minmax(0, 1fr); }
  .option-row { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .option-card span { width: 100%; }
  .action-row .button { width: 100%; }
  .phase-result-row { grid-template-columns: 2rem minmax(70px, 1fr) minmax(6.5rem, auto); }
}

@media print {
  :root { background: #fff; }
  body { background: #fff; font-size: 9.75pt; line-height: 1.45; }
  .site-header, .skip-link, .action-row, .contact-box, .formula-figure { display: none !important; }
  .tool-shell { width: 100%; max-width: none; padding: 0; }
  .tool-hero, .panel, .notice { box-shadow: none; }
  .tool-hero { padding: 0.85rem 1rem; }
  .lead { margin: 0.55rem 0; line-height: 1.5; }
  .meta-list { margin-top: 0.55rem; }
  .notice-grid, .calculator-layout { gap: 0.65rem; margin-top: 0.65rem; }
  .notice, .panel { padding: 0.78rem; }
  .panel, .tool-hero, .calculator-layout, .record-grid, .source-section { break-inside: auto; }
  .calculator-layout { display: block; }
  .calculator-panel { margin-bottom: 0.65rem; }
  .field-card, .input-with-unit, .settings-row, .notice, .result-head, .result-number, .formula-line, .record-field, .metric-list, .phase-results, .table-scroll { break-inside: avoid; page-break-inside: avoid; }
  .panel > h2, fieldset > legend, .result-section > h3 { break-after: avoid; page-break-after: avoid; }
  .result-panel { position: static; }
  .result-panel[hidden] { display: block !important; }
  .result-panel[hidden]::before { content: "계산 결과가 생성되지 않았습니다. 입력값과 결과를 포함하려면 계산 후 인쇄하십시오."; display: block; padding: 0.8rem; border: 1px solid #000; break-inside: avoid; }
  input, select, textarea { border-color: #777 !important; color: #000 !important; background: #fff !important; }
  a { color: #000; text-decoration: none; }
  .record-section, .source-section { margin-top: 0.72rem; }
  .record-grid { gap: 0.55rem; }
  .source-list li { margin: 0.22rem 0; font-size: 8.5pt; line-height: 1.4; }
  .source-section > p { margin: 0.45rem 0; font-size: 8.5pt; line-height: 1.4; }
  a[href^="http"]::after { content: " (" attr(href) ")"; font-size: 7.5pt; overflow-wrap: anywhere; }
  .site-footer { padding: 0.65rem 0; border-top: 1px solid #000; }
}