/* @section: design-system */
:root {
  color-scheme: light;
  --background: #f5f6f2;
  --surface: #ffffff;
  --surface-soft: #eef2ee;
  --surface-warm: #f7f3ea;
  --text: #18201d;
  --muted: #64706b;
  --border: #d8ded9;
  --border-strong: #bdc8c1;
  --primary: #0e6655;
  --primary-strong: #084b3e;
  --primary-soft: #dfeee8;
  --accent: #c9873d;
  --danger: #a44c48;
  --danger-soft: #f6e8e6;
  --warning: #8a6226;
  --warning-soft: #f5ecdc;
  --positive: #236c53;
  --positive-soft: #e2efe8;
  --shadow: 0 18px 45px rgba(26, 45, 37, 0.08);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --font-sans: Pretendard, "Noto Sans KR", -apple-system, BlinkMacSystemFont, "Segoe UI", "Apple SD Gothic Neo", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  background: var(--background);
  color: var(--text);
  font-family: var(--font-sans);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
button, input, select { font: inherit; }
button { -webkit-tap-highlight-color: transparent; }
a { color: inherit; }
.shell { width: min(1180px, calc(100% - 40px)); margin-inline: auto; }

/* @section: app-header */
.app-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid color-mix(in srgb, var(--border) 82%, transparent);
  background: color-mix(in srgb, var(--background) 90%, transparent);
  backdrop-filter: blur(16px);
}
.header-inner { min-height: 64px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; text-decoration: none; letter-spacing: -0.025em; }
.brand-mark { width: 30px; height: 30px; border-radius: 9px; display: grid; place-items: center; background: var(--primary); }
.brand-mark::before, .brand-mark::after, .brand-mark span { content: ""; display: block; width: 14px; height: 2px; border-radius: 99px; background: white; }
.brand-mark { gap: 3px; align-content: center; }
.brand-mark::before { width: 8px; justify-self: start; margin-left: 8px; }
.brand-mark::after { width: 11px; justify-self: start; margin-left: 8px; }
.brand-mark span { width: 14px; justify-self: start; margin-left: 8px; }
.header-actions { display: flex; gap: 8px; }
.ghost-button { min-height: 38px; padding: 0 13px; border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--surface); color: var(--muted); cursor: pointer; font-size: 0.82rem; font-weight: 700; transition: border-color .18s ease, color .18s ease, background .18s ease; }
.ghost-button:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-soft); }
.ghost-button:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible { outline: 3px solid color-mix(in srgb, var(--primary) 22%, transparent); outline-offset: 2px; }

/* @section: tool-intro */
.intro { padding: 56px 0 34px; display: grid; grid-template-columns: minmax(0, 1.45fr) minmax(300px, .55fr); gap: 36px; align-items: end; }
.eyebrow, .step-label { display: block; margin: 0 0 8px; color: var(--primary); font-size: .72rem; font-weight: 850; letter-spacing: .12em; }
.intro h1 { margin: 0; font-size: clamp(2.2rem, 4.4vw, 4.25rem); line-height: 1.07; letter-spacing: -.055em; font-weight: 860; }
.intro h1 span { color: var(--primary); }
.intro-copy { max-width: 650px; margin: 18px 0 0; color: var(--muted); font-size: clamp(.98rem, 1.6vw, 1.12rem); }
.formula-note { border-left: 3px solid var(--accent); padding: 7px 0 7px 18px; display: grid; gap: 5px; }
.formula-note .formula-label { color: var(--accent); font-size: .72rem; font-weight: 800; letter-spacing: .08em; }
.formula-note strong { font-size: .9rem; }
.formula-note small { color: var(--muted); font-size: .74rem; }

/* @section: calculator-workspace */
.workspace { display: grid; grid-template-columns: minmax(0, .92fr) minmax(430px, 1.08fr); gap: 18px; align-items: start; padding-bottom: 70px; }
.input-panel, .result-panel { border: 1px solid var(--border); border-radius: var(--radius-lg); background: var(--surface); box-shadow: var(--shadow); }
.input-panel { overflow: hidden; }
.panel-heading, .result-topline { min-height: 82px; padding: 20px 22px; display: flex; align-items: center; justify-content: space-between; gap: 16px; border-bottom: 1px solid var(--border); }
.panel-heading h2, .result-topline h2 { margin: 0; font-size: 1.22rem; letter-spacing: -.025em; }
.live-pill { display: inline-flex; align-items: center; gap: 7px; padding: 6px 9px; border-radius: 999px; background: var(--positive-soft); color: var(--positive); font-size: .72rem; font-weight: 750; }
.live-pill > span:first-child { flex: 0 0 6px; width: 6px; height: 6px; border-radius: 50%; background: var(--positive); box-shadow: 0 0 0 4px color-mix(in srgb, var(--positive) 14%, transparent); }
.live-pill > span:last-child { min-width: 0; }
.field-section { padding: 20px 22px; border-bottom: 1px solid var(--border); }
.field-section:last-child { border-bottom: 0; }
.section-title-row { display: flex; align-items: center; justify-content: space-between; margin-bottom: 13px; }
.section-title-row h3 { margin: 0; font-size: .86rem; letter-spacing: -.01em; }
.section-title-row > span, .section-title-row > strong { color: var(--muted); font-size: .72rem; font-weight: 750; }
.field-grid { display: grid; gap: 12px; }
.two-columns { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.full-span { grid-column: 1 / -1; }
.field { display: grid; gap: 6px; color: var(--muted); font-size: .76rem; font-weight: 700; }
.field small { font-weight: 500; color: var(--muted); line-height: 1.4; }
.input-wrap { position: relative; }
.input-wrap input, select { width: 100%; min-height: 45px; border: 1px solid var(--border); border-radius: 9px; background: #fcfdfb; color: var(--text); transition: border-color .18s ease, box-shadow .18s ease, background .18s ease; }
.input-wrap input { padding: 10px 42px 10px 12px; text-align: right; font-weight: 750; }
.input-wrap span { position: absolute; right: 13px; top: 50%; transform: translateY(-50%); color: var(--muted); font-size: .74rem; font-weight: 700; pointer-events: none; }
select { padding: 10px 12px; appearance: auto; font-weight: 650; }
.input-wrap input:hover, select:hover { border-color: var(--border-strong); background: var(--surface); }
.input-wrap input:focus, select:focus { border-color: var(--primary); box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 10%, transparent); outline: none; background: var(--surface); }
input[type="number"]::-webkit-inner-spin-button { opacity: .45; }
.control-section { background: linear-gradient(180deg, rgba(223, 238, 232, 0.45), rgba(255, 255, 255, 0)); }
.global-grid .full-span { grid-column: 1 / -1; }
.currency-unit { min-width: 1.3em; text-align: right; }
.kpi-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.kpi-grid article { padding: 12px; border: 1px solid var(--border); border-radius: 10px; background: #fbfcfa; }
.kpi-grid span { display: block; color: var(--muted); font-size: .68rem; }
.kpi-grid strong { display: block; margin-top: 3px; font-size: 1rem; letter-spacing: -.025em; }
.export-actions { grid-template-columns: repeat(3, 1fr); }
.range-field { margin-top: 16px; }
.range-label { display: flex; justify-content: space-between; align-items: center; }
.range-label strong, #targetMarginOutput { color: var(--primary); font-size: .86rem; }
input[type="range"] { width: 100%; height: 5px; margin: 5px 0 0; accent-color: var(--primary); cursor: pointer; }
.range-scale { display: flex; justify-content: space-between; color: #95a09b; font-size: .64rem; font-weight: 500; }
.effective-price-row { margin-top: 11px; display: flex; align-items: center; justify-content: space-between; padding: 9px 11px; border-radius: 8px; background: var(--surface-soft); color: var(--muted); font-size: .76rem; }
.effective-price-row strong { color: var(--text); font-size: .84rem; }
.target-section { background: var(--surface-warm); }

/* @section: result-dashboard */
.result-panel { position: sticky; top: 82px; padding-bottom: 18px; overflow: hidden; }
.status-badge { display: inline-flex; align-items: center; min-height: 29px; padding: 0 10px; border-radius: 999px; background: var(--surface-soft); color: var(--muted); font-size: .72rem; font-weight: 800; }
.status-badge.positive { background: var(--positive-soft); color: var(--positive); }
.status-badge.warning { background: var(--warning-soft); color: var(--warning); }
.status-badge.negative { background: var(--danger-soft); color: var(--danger); }
.hero-result { padding: 24px 24px 19px; background: var(--primary-strong); color: white; }
.hero-result > span { display: block; color: rgba(255,255,255,.68); font-size: .78rem; font-weight: 650; }
.hero-result > strong { display: block; margin-top: 2px; font-size: clamp(2.2rem, 5vw, 3.5rem); line-height: 1.12; letter-spacing: -.045em; }
.hero-result.loss > strong { color: #f6c5bd; }
.margin-readout { display: flex; justify-content: space-between; align-items: baseline; margin-top: 20px; color: rgba(255,255,255,.72); font-size: .78rem; }
.margin-readout b { color: white; font-size: 1.03rem; }
.profit-meter { position: relative; height: 8px; margin-top: 7px; border-radius: 999px; background: rgba(255,255,255,.16); overflow: visible; }
.profit-meter span { display: block; height: 100%; width: 0; border-radius: inherit; background: #e8c188; transition: width .32s ease, background .2s ease; }
.profit-meter i { position: absolute; top: -4px; width: 2px; height: 16px; background: white; border-radius: 2px; transition: left .25s ease; }
.meter-labels { display: flex; justify-content: space-between; margin-top: 6px; color: rgba(255,255,255,.55); font-size: .62rem; }
.meter-labels b { color: rgba(255,255,255,.8); }
.price-cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 9px; padding: 14px 16px 0; }
.price-card { min-height: 92px; padding: 13px; border: 1px solid var(--border); border-radius: var(--radius-md); background: #fbfcfa; display: grid; align-content: center; gap: 3px; }
.price-card.emphasized { border-color: color-mix(in srgb, var(--primary) 38%, var(--border)); background: var(--primary-soft); }
.price-card.full-width { min-height: 85px; grid-column: 1 / -1; grid-template-columns: 1fr auto; align-items: center; }
.price-card.full-width small { grid-column: 1 / -1; }
.price-card span { color: var(--muted); font-size: .72rem; font-weight: 700; }
.price-card strong { color: var(--text); font-size: 1.35rem; letter-spacing: -.025em; }
.price-card.emphasized strong, .price-card.full-width strong { color: var(--primary-strong); }
.price-card small { color: var(--muted); font-size: .68rem; }
.result-section { margin: 16px 16px 0; padding: 15px; border: 1px solid var(--border); border-radius: var(--radius-md); }
.result-section-heading { display: flex; justify-content: space-between; align-items: center; margin-bottom: 11px; }
.result-section-heading h3 { margin: 0; font-size: .8rem; }
.result-section-heading strong { font-size: .8rem; color: var(--muted); }
.cost-bars { display: grid; gap: 8px; }
.cost-row { display: grid; grid-template-columns: 78px 1fr 76px; gap: 9px; align-items: center; font-size: .7rem; }
.cost-row > span:first-child { color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.cost-track { height: 6px; border-radius: 999px; background: var(--surface-soft); overflow: hidden; }
.cost-track i { display: block; height: 100%; border-radius: inherit; background: var(--primary); opacity: .72; transition: width .3s ease; }
.cost-row strong { text-align: right; font-size: .72rem; }
.compact-summary { display: grid; grid-template-columns: repeat(3, 1fr); padding: 0; overflow: hidden; }
.compact-summary div { padding: 12px 13px; border-right: 1px solid var(--border); }
.compact-summary div:last-child { border-right: 0; }
.compact-summary span { display: block; color: var(--muted); font-size: .68rem; }
.compact-summary strong { display: block; margin-top: 2px; font-size: .85rem; }
.result-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; padding: 14px 16px 0; }
.primary-button, .secondary-button { min-height: 43px; border-radius: 9px; cursor: pointer; font-size: .78rem; font-weight: 800; transition: transform .16s ease, background .18s ease, border-color .18s ease; }
.primary-button { border: 1px solid var(--primary); background: var(--primary); color: white; }
.primary-button:hover { background: var(--primary-strong); transform: translateY(-1px); }
.secondary-button { border: 1px solid var(--border); background: var(--surface); color: var(--text); }
.secondary-button:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-soft); }
.calculation-details { margin: 14px 16px 0; padding: 14px; border-radius: 10px; background: var(--surface-soft); }
.calculation-details h3 { margin: 0 0 8px; font-size: .8rem; }
.calculation-details dl { margin: 0; display: grid; gap: 4px; }
.calculation-details dl div { display: flex; justify-content: space-between; gap: 14px; font-size: .7rem; }
.calculation-details dt { color: var(--muted); }
.calculation-details dd { margin: 0; font-weight: 750; }
.calculation-details p { margin: 9px 0 0; color: var(--muted); font-size: .64rem; }
.error-message { margin: 14px 16px 0; padding: 10px 12px; border-radius: 8px; background: var(--danger-soft); color: var(--danger); font-size: .74rem; font-weight: 650; }

/* @section: premium-preview */
.premium-preview { margin-bottom: 70px; padding: 30px 34px; border: 1px solid #d8ccb9; border-radius: var(--radius-lg); background: var(--surface-warm); display: grid; grid-template-columns: 1.2fr .8fr; gap: 40px; align-items: center; }
.premium-preview h2 { margin: 0; max-width: 620px; font-size: clamp(1.3rem, 2.5vw, 2rem); letter-spacing: -.035em; }
.premium-preview p { margin: 10px 0 0; color: var(--muted); font-size: .9rem; }
.premium-preview ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 7px; }
.premium-preview li { display: grid; grid-template-columns: 72px 1fr; gap: 12px; padding: 9px 11px; border-bottom: 1px solid #ddd3c3; font-size: .78rem; }
.premium-preview li strong { color: var(--accent); }
.premium-preview li span { color: var(--muted); }

/* @section: site-footer */
.site-footer { border-top: 1px solid var(--border); background: #edf0eb; }
.site-footer .shell { min-height: 86px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.site-footer span { font-weight: 800; font-size: .82rem; }
.site-footer p { margin: 0; color: var(--muted); font-size: .7rem; text-align: right; }
.toast { position: fixed; left: 50%; bottom: 24px; z-index: 50; transform: translate(-50%, 16px); padding: 10px 14px; border-radius: 9px; background: var(--text); color: white; box-shadow: var(--shadow); font-size: .76rem; font-weight: 700; opacity: 0; pointer-events: none; transition: opacity .2s ease, transform .2s ease; }
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* @section: responsive */
@media (max-width: 900px) {
  .intro { grid-template-columns: 1fr; padding-top: 38px; gap: 22px; }
  .formula-note { max-width: 520px; }
  .workspace { grid-template-columns: 1fr; }
  .result-panel { position: static; }
  .premium-preview { grid-template-columns: 1fr; gap: 22px; }
}
@media (max-width: 600px) {
  .shell { width: min(100% - 24px, 1180px); }
  .header-inner { min-height: 58px; }
  .brand { font-size: .86rem; }
  .brand-mark { width: 28px; height: 28px; }
  .header-actions .ghost-button:first-child { display: none; }
  .intro { padding: 30px 0 24px; }
  .intro h1 { font-size: clamp(2rem, 10vw, 3rem); }
  .intro-copy { margin-top: 13px; }
  .workspace { gap: 12px; padding-bottom: 46px; }
  .input-panel, .result-panel { border-radius: 14px; }
  .panel-heading, .result-topline { min-height: 72px; padding: 17px; }
  .field-section { padding: 18px 17px; }
  .two-columns { grid-template-columns: 1fr 1fr; gap: 10px; }
  .price-cards { grid-template-columns: 1fr; }
  .price-card.full-width { grid-column: auto; grid-template-columns: 1fr; }
  .price-card.full-width small { grid-column: auto; }
  .compact-summary { grid-template-columns: 1fr 1fr 1fr; }
  .compact-summary div { padding: 10px 8px; text-align: center; }
  .compact-summary strong { font-size: .78rem; }
  .cost-row { grid-template-columns: 68px 1fr 68px; gap: 6px; }
  .result-actions { grid-template-columns: 1fr; }
  .export-actions { grid-template-columns: 1fr; }
  .kpi-grid { grid-template-columns: 1fr 1fr; }
  .premium-preview { margin-bottom: 45px; padding: 24px 20px; }
  .site-footer .shell { padding: 18px 0; flex-direction: column; align-items: flex-start; gap: 5px; }
  .site-footer p { text-align: left; }
}
@media (max-width: 390px) {
  .two-columns { grid-template-columns: 1fr; }
  .full-span { grid-column: auto; }
  .hero-result { padding-inline: 19px; }
  .hero-result > strong { font-size: 2.2rem; }
  .compact-summary { grid-template-columns: 1fr; }
  .compact-summary div { border-right: 0; border-bottom: 1px solid var(--border); text-align: left; }
  .compact-summary div:last-child { border-bottom: 0; }
  .kpi-grid { grid-template-columns: 1fr; }
  .global-grid { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; }
}