:root {
  --ink: #12241f;
  --ink-soft: #2a4038;
  --paper: #f3f7f1;
  --panel: rgba(255, 255, 255, 0.78);
  --line: rgba(18, 36, 31, 0.12);
  --accent: #c8f560;
  --accent-ink: #143016;
  --warn: #e85d4c;
  --shadow: 0 18px 40px rgba(12, 28, 22, 0.12);
  --radius: 18px;
  --font-brand: "Black Han Sans", sans-serif;
  --font-body: "Noto Sans KR", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.5;
}

.bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse 80% 50% at 10% -10%, rgba(200, 245, 96, 0.35), transparent 55%),
    radial-gradient(ellipse 60% 45% at 100% 0%, rgba(62, 140, 110, 0.28), transparent 50%),
    radial-gradient(ellipse 50% 40% at 50% 100%, rgba(18, 36, 31, 0.08), transparent 60%),
    linear-gradient(165deg, #e8f0e4 0%, #f3f7f1 45%, #dce8df 100%);
}

.bg::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.35;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.45'/%3E%3C/svg%3E");
  pointer-events: none;
  mix-blend-mode: multiply;
}

.top {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2.25rem 1.25rem 1rem;
  animation: rise 0.7s ease both;
}

.brand {
  margin: 0;
  font-family: var(--font-brand);
  font-size: clamp(2.6rem, 8vw, 4.2rem);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.05;
  color: var(--ink);
}

.tagline {
  margin: 0.55rem 0 0;
  max-width: 28rem;
  font-size: 1.05rem;
  color: var(--ink-soft);
  font-weight: 500;
}

.layout {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.25rem 2rem;
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
}

@media (min-width: 900px) {
  .layout {
    grid-template-columns: 0.9fr 1.35fr 0.95fr;
    align-items: start;
  }
}

.panel {
  background: var(--panel);
  backdrop-filter: blur(10px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem 1rem 1.1rem;
  box-shadow: var(--shadow);
  animation: rise 0.7s ease both;
}

.people-panel { animation-delay: 0.08s; }
.items-panel { animation-delay: 0.16s; }
.result-panel { animation-delay: 0.24s; }

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.85rem;
}

.panel-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.4rem;
}

.panel-head h2 {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.btn {
  appearance: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: 999px;
  padding: 0.45rem 0.9rem;
  transition: transform 0.15s ease, background 0.15s ease, opacity 0.15s ease;
}

.btn:active {
  transform: scale(0.97);
}

.btn.ghost {
  background: rgba(18, 36, 31, 0.06);
  color: var(--ink);
}

.btn.ghost:hover {
  background: rgba(18, 36, 31, 0.1);
}

.btn.primary {
  background: var(--accent);
  color: var(--accent-ink);
}

.btn.primary:hover {
  filter: brightness(1.03);
}

.btn.icon {
  width: 2rem;
  height: 2rem;
  padding: 0;
  border-radius: 10px;
  background: transparent;
  color: var(--ink-soft);
  font-size: 1.1rem;
  line-height: 1;
}

.btn.icon:hover {
  background: rgba(232, 93, 76, 0.12);
  color: var(--warn);
}

.people-list,
.result-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.person-row,
.item-card {
  display: flex;
  gap: 0.45rem;
  align-items: center;
  animation: pop 0.35s ease both;
}

.person-row input,
.item-card input[type="text"],
.item-card input[type="number"],
.fee-row input {
  width: 100%;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 12px;
  padding: 0.65rem 0.75rem;
  font: inherit;
  font-size: 0.95rem;
  color: var(--ink);
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.person-row input:focus,
.item-card input:focus,
.fee-row input:focus {
  border-color: rgba(62, 140, 110, 0.55);
  box-shadow: 0 0 0 3px rgba(200, 245, 96, 0.35);
}

.items-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.item-card {
  flex-direction: column;
  align-items: stretch;
  padding: 0.85rem;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--line);
}

.item-main {
  display: grid;
  grid-template-columns: 1fr 7.5rem auto;
  gap: 0.45rem;
  align-items: center;
}

@media (max-width: 520px) {
  .item-main {
    grid-template-columns: 1fr 1fr auto;
  }
}

.eaters-hint {
  margin: 0.7rem 0 0.4rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: rgba(18, 36, 31, 0.45);
}

.eaters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.eater {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.42rem 0.55rem 0.42rem 0.75rem;
  border-radius: 999px;
  background: #fff;
  border: 1.5px solid rgba(18, 36, 31, 0.22);
  box-shadow: 0 1px 0 rgba(18, 36, 31, 0.06);
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--ink-soft);
  cursor: pointer;
  user-select: none;
  transition:
    background 0.15s ease,
    border-color 0.15s ease,
    color 0.15s ease,
    box-shadow 0.15s ease,
    transform 0.12s ease;
}

.eater:hover {
  border-color: rgba(18, 36, 31, 0.4);
  box-shadow: 0 2px 8px rgba(18, 36, 31, 0.1);
  transform: translateY(-1px);
}

.eater:active {
  transform: translateY(0) scale(0.97);
}

.eater input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.eater-mark {
  display: grid;
  place-items: center;
  width: 1.15rem;
  height: 1.15rem;
  border-radius: 50%;
  background: rgba(18, 36, 31, 0.08);
  color: var(--ink-soft);
  font-size: 0.78rem;
  font-weight: 700;
  line-height: 1;
}

.eater-mark::before {
  content: "+";
}

.eater:has(input:checked) {
  background: var(--accent);
  border-color: rgba(62, 140, 110, 0.55);
  color: var(--accent-ink);
  box-shadow: 0 2px 0 rgba(62, 140, 110, 0.2);
}

.eater:has(input:checked) .eater-mark {
  background: rgba(20, 48, 22, 0.14);
  color: var(--accent-ink);
}

.eater:has(input:checked) .eater-mark::before {
  content: "×";
  font-size: 0.95rem;
}

.eater-empty {
  font-size: 0.82rem;
  color: var(--ink-soft);
  margin-top: 0.55rem;
}

.fee-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 0.9rem;
  padding-top: 0.9rem;
  border-top: 1px dashed var(--line);
}

.fee-row label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--ink-soft);
}

.fee-row input {
  width: 5.5rem;
  text-align: right;
}

.total-line {
  margin: 0 0 0.85rem;
  font-size: 0.95rem;
  color: var(--ink-soft);
}

.total-line strong {
  font-size: 1.35rem;
  color: var(--ink);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.result-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.7rem 0.8rem;
  border-radius: 12px;
  background: rgba(18, 36, 31, 0.04);
  animation: pop 0.4s ease both;
}

.result-row .name {
  font-weight: 600;
}

.result-row .amount {
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  font-size: 1.05rem;
}

.result-empty {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.hint {
  margin: 0.75rem 0 0;
  font-size: 0.85rem;
  color: var(--accent-ink);
  font-weight: 600;
}

.ad-slot {
  max-width: 1100px;
  margin: 0 auto 1.5rem;
  padding: 0 1.25rem;
}

.ad-label {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: rgba(18, 36, 31, 0.4);
}

.adfit-wrap {
  display: flex;
  justify-content: center;
  overflow: hidden;
}

.adfit-pc {
  display: flex;
}

.adfit-mobile {
  display: none;
}

@media (max-width: 767px) {
  .adfit-pc {
    display: none;
  }

  .adfit-mobile {
    display: flex;
  }
}

.foot {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.25rem 2.5rem;
}

.foot p {
  margin: 0;
  font-size: 0.8rem;
  color: rgba(18, 36, 31, 0.45);
}

.seo {
  max-width: 1100px;
  margin: 0 auto 1.75rem;
  padding: 0 1.25rem;
}

.seo h2 {
  margin: 0 0 0.55rem;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.seo p {
  margin: 0 0 0.75rem;
  max-width: 40rem;
  font-size: 0.92rem;
  color: var(--ink-soft);
  line-height: 1.65;
}

.seo ul {
  margin: 0;
  padding-left: 1.15rem;
  max-width: 40rem;
  color: var(--ink-soft);
  font-size: 0.9rem;
  line-height: 1.7;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pop {
  from {
    opacity: 0;
    transform: translateY(6px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}