/* ============================================================
   By B · Project Plan-B — Toss-style theme
   ============================================================ */
:root {
  /* Palette (Toss design language) */
  --bg:            #ffffff;
  --fill:          #f2f4f6;   /* input & chip fill */
  --fill-hover:    #e8ebee;
  --ink:           #191f28;   /* near-black text */
  --ink-sub:       #4e5968;   /* secondary */
  --ink-soft:      #8b95a1;   /* tertiary / hints */
  --ink-faint:     #b0b8c1;   /* placeholder */
  --line:          #e5e8eb;
  --mint:          #00b8a2;   /* mint */
  --mint-deep:     #009c8a;   /* pressed */
  --mint-tint:     #e4f8f4;   /* selected wash */
  --danger:        #f04452;
  --radius:        16px;
  --radius-sm:     12px;
  --ease-out:      cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { background: var(--bg); }

body {
  font-family: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont, system-ui, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  padding: clamp(24px, 5vw, 48px) 20px 40px;
}

.app {
  width: 100%;
  max-width: 480px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
}

/* ---------- Global nav ---------- */
.nav {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 2px 0 22px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.nav__logo {
  font-size: 17px;
  font-weight: 800;
  color: var(--mint);
  text-decoration: none;
  margin-right: 10px;
  flex-shrink: 0;
}
.nav a.nav__link {
  flex-shrink: 0;
  padding: 7px 12px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink-sub);
  text-decoration: none;
  transition: background 0.15s var(--ease-out), color 0.15s var(--ease-out);
}
.nav a.nav__link:hover { background: var(--fill); }
.nav a.nav__link.is-active { background: var(--fill); color: var(--ink); }

/* ---------- Sub-page prose ---------- */
.page-hero { padding: 8px 4px 28px; }
.page-hero .title { font-size: clamp(23px, 6vw, 28px); }

.prose { font-size: 15.5px; color: var(--ink-sub); }
.prose h2 {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin: 36px 0 12px;
}
.prose h3 {
  font-size: 16.5px;
  font-weight: 700;
  color: var(--ink);
  margin: 26px 0 8px;
}
.prose p { margin: 10px 0; }
.prose ul, .prose ol { margin: 10px 0 10px 22px; }
.prose li { margin: 5px 0; }
.prose strong { color: var(--ink); font-weight: 700; }
.prose .callout {
  background: var(--mint-tint);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  font-size: 14px;
  color: var(--ink-sub);
  margin: 14px 0;
}
.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 14px 0;
  font-size: 14px;
}
.prose th, .prose td {
  text-align: left;
  padding: 9px 10px;
  border-bottom: 1px solid var(--line);
}
.prose th { color: var(--ink-soft); font-weight: 600; font-size: 12.5px; }
.prose td:last-child { font-weight: 600; color: var(--ink); }

/* FAQ accordion */
.faq-item {
  border-bottom: 1px solid var(--line);
  padding: 4px 0;
}
.faq-item summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 14px 2px;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--ink);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "";
  width: 8px; height: 8px;
  border-right: 2px solid var(--ink-soft);
  border-bottom: 2px solid var(--ink-soft);
  transform: rotate(45deg);
  transition: transform 0.2s var(--ease-out);
  flex-shrink: 0;
}
.faq-item[open] summary::after { transform: rotate(-135deg); }
.faq-item .faq-a {
  padding: 0 2px 16px;
  font-size: 14.5px;
  color: var(--ink-sub);
}

/* Content link cards (home) */
.more-links {
  margin-top: 44px;
  padding-top: 36px;
  border-top: 1px solid var(--line);
}
.more-links__title { font-size: 20px; font-weight: 800; letter-spacing: -0.02em; }
.more-links__list {
  list-style: none;
  margin-top: 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.more-links__list a {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  padding: 16px 18px;
  border-radius: var(--radius-sm);
  background: var(--fill);
  text-decoration: none;
  transition: background 0.15s var(--ease-out), transform 0.1s var(--ease-out);
}
.more-links__list a:hover { background: var(--fill-hover); }
.more-links__list a:active { transform: scale(0.99); }
.more-links__name { font-size: 15px; font-weight: 700; color: var(--ink); }
.more-links__desc { display: block; font-size: 13px; font-weight: 400; color: var(--ink-soft); margin-top: 2px; }
.more-links__arrow { color: var(--ink-faint); font-weight: 700; flex-shrink: 0; }

/* Footer nav */
.footer-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 4px 16px;
  margin-bottom: 10px;
}
.footer-links a {
  font-size: 12.5px;
  color: var(--ink-soft);
  text-decoration: none;
}
.footer-links a:hover { color: var(--ink-sub); text-decoration: underline; }

/* ---------- Header ---------- */
.app__header { padding: 8px 4px 32px; }
.brand-chip {
  display: inline-block;
  padding: 5px 12px;
  border-radius: 999px;
  background: var(--mint-tint);
  color: var(--mint);
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 16px;
}
.title {
  font-size: clamp(25px, 6.5vw, 30px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.32;
}
.subtitle {
  margin-top: 10px;
  font-size: 15px;
  font-weight: 400;
  color: var(--ink-soft);
}

/* ---------- Form fields ---------- */
.field { border: none; margin-bottom: 28px; }
.field__label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink-sub);
  margin-bottom: 10px;
}
.field__hint {
  font-size: 13px;
  color: var(--ink-soft);
  margin-top: 8px;
}
.field__hint.is-error { color: var(--danger); }

/* Segmented category */
.segment {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.segment__item { position: relative; cursor: pointer; }
.segment__item input { position: absolute; opacity: 0; inset: 0; cursor: pointer; }
.segment__body {
  display: block;
  padding: 16px;
  border-radius: var(--radius-sm);
  background: var(--fill);
  border: 1.5px solid transparent;
  transition: background 0.15s var(--ease-out), border-color 0.15s var(--ease-out), transform 0.1s var(--ease-out);
}
.segment__item:active .segment__body { transform: scale(0.98); }
.segment__title { display: block; font-size: 16px; font-weight: 700; }
.segment__desc { display: block; font-size: 12.5px; color: var(--ink-soft); margin-top: 2px; }
.segment__item input:checked + .segment__body {
  background: var(--mint-tint);
  border-color: var(--mint);
}
.segment__item input:checked + .segment__body .segment__title { color: var(--mint); }
.segment__item input:focus-visible + .segment__body {
  outline: 2px solid var(--mint);
  outline-offset: 2px;
}

/* Money input — borderless gray fill */
.input-money {
  display: flex;
  align-items: baseline;
  gap: 6px;
  background: var(--fill);
  border-radius: var(--radius-sm);
  padding: 4px 18px;
  transition: box-shadow 0.15s var(--ease-out);
}
.input-money:focus-within { box-shadow: inset 0 0 0 1.5px var(--mint); }
.input-money.is-error { box-shadow: inset 0 0 0 1.5px var(--danger); }
.input-money input {
  flex: 1;
  min-width: 0;
  border: none;
  outline: none;
  background: transparent;
  font-family: inherit;
  font-size: 22px;
  font-weight: 700;
  color: var(--ink);
  padding: 12px 0;
  letter-spacing: -0.01em;
}
.input-money input::placeholder { color: var(--ink-faint); }
.input-money__unit { font-size: 16px; font-weight: 500; color: var(--ink-sub); }

/* Select — gray fill */
.select-wrap { position: relative; }
.select-wrap::after {
  content: "";
  position: absolute;
  right: 18px; top: 50%;
  width: 8px; height: 8px;
  border-right: 2px solid var(--ink-soft);
  border-bottom: 2px solid var(--ink-soft);
  border-radius: 1px;
  transform: translateY(-65%) rotate(45deg);
  pointer-events: none;
}
.select-wrap select {
  width: 100%;
  appearance: none;
  -webkit-appearance: none;
  border: none;
  border-radius: var(--radius-sm);
  padding: 16px 44px 16px 18px;
  font-family: inherit;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  background: var(--fill);
  cursor: pointer;
  transition: box-shadow 0.15s var(--ease-out);
}
.select-wrap select:focus { outline: none; box-shadow: inset 0 0 0 1.5px var(--mint); }

/* Condition chips */
.chips {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}
.chip { position: relative; cursor: pointer; }
.chip input { position: absolute; opacity: 0; inset: 0; cursor: pointer; }
.chip__body {
  display: block;
  text-align: center;
  padding: 13px 8px;
  border-radius: var(--radius-sm);
  background: var(--fill);
  border: 1.5px solid transparent;
  transition: background 0.15s var(--ease-out), border-color 0.15s var(--ease-out), transform 0.1s var(--ease-out);
}
.chip:active .chip__body { transform: scale(0.98); }
.chip__grade { display: block; font-size: 15px; font-weight: 700; }
.chip__desc { display: block; font-size: 12px; color: var(--ink-soft); margin-top: 1px; }
.chip input:checked + .chip__body {
  background: var(--mint-tint);
  border-color: var(--mint);
}
.chip input:checked + .chip__body .chip__grade { color: var(--mint); }
.chip input:focus-visible + .chip__body {
  outline: 2px solid var(--mint);
  outline-offset: 2px;
}

/* Primary CTA */
.btn-primary {
  width: 100%;
  margin-top: 6px;
  height: 56px;
  border: none;
  border-radius: var(--radius-sm);
  background: var(--mint);
  color: #fff;
  font-family: inherit;
  font-size: 17px;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s var(--ease-out), transform 0.1s var(--ease-out);
}
.btn-primary:hover { background: var(--mint-deep); }
.btn-primary:active { transform: scale(0.98); }
.btn-primary:focus-visible { outline: 2px solid var(--mint-deep); outline-offset: 2px; }

/* ---------- Result ---------- */
.result {
  margin-top: 40px;
  padding-top: 36px;
  border-top: 1px solid var(--line);
}
.result.is-hidden { display: none; }
.result.is-visible { animation: fadeInUp 0.45s var(--ease-out) both; }

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}

.result__eyebrow {
  font-size: 14px;
  font-weight: 600;
  color: var(--mint);
  margin-bottom: 6px;
}
.result__headline { display: flex; align-items: baseline; gap: 3px; }
.result__price {
  font-size: clamp(38px, 10vw, 46px);
  font-weight: 800;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}
.result__won { font-size: 24px; font-weight: 700; color: var(--ink); }
.result__note {
  font-size: 14px;
  color: var(--ink-soft);
  margin-top: 8px;
}

/* Range bar */
.range { margin-top: 28px; }
.range__track {
  position: relative;
  height: 10px;
  border-radius: 999px;
  background: var(--fill);
}
.range__fill {
  position: absolute;
  inset: 0;
  border-radius: 999px;
  background: var(--mint-tint);
}
.range__fill::before {
  content: "";
  position: absolute;
  left: 20%; right: 20%;
  top: 0; bottom: 0;
  border-radius: 999px;
  background: var(--mint);
  opacity: 0.35;
}
.range__marker {
  position: absolute;
  top: 50%; left: 50%;
  width: 20px; height: 20px;
  border-radius: 50%;
  background: #fff;
  border: 3.5px solid var(--mint);
  box-shadow: 0 2px 8px rgba(25, 31, 40, 0.14);
  transform: translate(-50%, -50%);
}
.range__labels {
  display: flex;
  justify-content: space-between;
  margin-top: 12px;
}
.range__end { text-align: left; }
.range__end--right { text-align: right; }
.range__cap { display: block; font-size: 12px; color: var(--ink-soft); }
.range__val {
  display: block;
  font-size: 16px;
  font-weight: 700;
  margin-top: 2px;
  font-variant-numeric: tabular-nums;
}

/* Depreciation chart */
.chart-wrap { margin-top: 32px; }
.chart-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}
.chart-desc {
  font-size: 13px;
  color: var(--ink-soft);
  margin-top: 3px;
}
.chart-canvas {
  position: relative;
  height: 220px;
  margin-top: 14px;
}

/* Breakdown */
.breakdown-wrap {
  margin-top: 28px;
  background: var(--fill);
  border-radius: var(--radius);
  padding: 20px;
}
.breakdown-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-soft);
  margin-bottom: 10px;
}
.breakdown { list-style: none; }
.breakdown li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 7px 0;
  font-size: 14.5px;
}
.breakdown li span:first-child { color: var(--ink-sub); }
.breakdown li span:last-child { font-weight: 600; font-variant-numeric: tabular-nums; }

/* ---------- Footer ---------- */
.app__footer {
  margin-top: 40px;
  font-size: 12.5px;
  color: var(--ink-faint);
  text-align: center;
}

/* ---------- Responsive ---------- */
@media (max-width: 360px) {
  .segment { grid-template-columns: 1fr; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}