:root {
  --green-100: #ecf7ef;
  --green-300: #b8e1c2;
  --green-500: #3b3;
  --green-600: #22aa22;
  --green-700: #0a8d35;
  --line: #d5e3d8;
  --surface: #ffffff;
  --surface-soft: #f6faf7;
  --text-main: #203025;
  --text-sub: #607167;
  --shadow: 0 10px 30px rgba(18, 44, 22, 0.08);
  --section-gap: 80px;
}

body {
  /* Block the drag */
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;

  font-family: "Gowun Dodum", sans-serif;
  color: var(--text-main);
  margin: 0;
  padding: 28px 20px 80px;
  background:
    radial-gradient(
      circle at top center,
      rgba(255, 255, 255, 0.08) 0%,
      transparent 35%
    ),
    linear-gradient(0deg, rgba(255, 255, 255, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.08) 1px, transparent 1px),
    radial-gradient(circle at top center, #1ed07a 0%, #1c6644 45%, #78e2b1 100%);
  background-size:
    100% 100%,
    40px 40px,
    40px 40px;
}

input,
button,
select {
  font-family: "Gowun Dodum", sans-serif;
}

.page-block {
  width: min(1080px, calc(100% - 24px));
  margin-left: auto;
  margin-right: auto;
}

.app-section {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 22px 24px;
  box-sizing: border-box;
}

form {
  margin: 0 auto;
}

.section-gap {
  margin-top: var(--section-gap);
}

/* Utility */
.can-drag {
  -webkit-user-select: text;
  -moz-user-select: text;
  -ms-user-select: text;
  user-select: text;
}

.center-text {
  width: 100%;
  text-align: center;
  margin: auto;
}

.white {
  color: #fff;
}

.gray {
  color: var(--text-sub);
}

.black {
  color: #000;
}

empty1 {
  display: block;
  width: 100%;
  height: 30px;
}

empty2 {
  display: block;
  width: 100%;
  height: 24px;
}

empty3 {
  display: block;
  width: 100%;
  height: 50px;
}

/* Page layout */
h1 {
  width: min(1080px, calc(100% - 24px));
  margin: 0 auto 20px;
  padding: 22px 0;
  text-align: center;
  color: var(--green-700);
  font-size: clamp(32px, 4vw, 42px);
  letter-spacing: 0.02em;
}

h2 {
  color: var(--green-700);
  margin: 0;
  font-size: clamp(24px, 3vw, 30px);
}

.intro {
  font-size: 17px;
  line-height: 1.8;
  max-width: min(1080px, calc(100% - 24px));
  margin: 0 auto;
}

.section-desc {
  font-size: 17px;
  line-height: 1.8;
  color: var(--text-sub);
  text-align: center;
}

.intro h2 {
  margin-bottom: 10px;
}

.material-symbols-outlined.black {
  color: var(--green-700);
}

/* Control container */
.member-section {
  padding-bottom: 20px;
}

.control-container {
  margin: 14px auto 18px;
  display: flex;
  justify-content: center;
  gap: 18px;
}

.control-button {
  margin: 0;
  width: 84px;
  border: 1px solid var(--green-600);
  background: linear-gradient(145deg, var(--green-500), var(--green-700));
  border-radius: 16px;
  align-items: center;
  display: flex;
  cursor: pointer;
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease,
    filter 0.2s ease;
  box-shadow: 0 8px 16px rgba(13, 118, 42, 0.18);
}

.control-button:after {
  content: "";
  display: block;
  padding-bottom: 100%;
}

.control-button span {
  width: 100%;
  font-size: 36px;
  color: #fff;
  text-align: center;
}

.control-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 18px rgba(13, 118, 42, 0.2);
  filter: brightness(1.04);
}

.control-button:disabled {
  border-color: #8da196;
  background: linear-gradient(145deg, #a8b8ad, #83988a);
  box-shadow: none;
}

.member-container {
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  background-color: var(--surface-soft);
  background-image:
    linear-gradient(0deg, rgba(196, 220, 204, 0.35) 1px, transparent 1px),
    linear-gradient(90deg, rgba(196, 220, 204, 0.25) 1px, transparent 1px);
  background-size: 34px 34px;
}

.member-field {
  display: grid;
  grid-template-columns: 130px 1fr;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-bottom: 1px solid #dbe8de;
  background: rgba(255, 255, 255, 0.88);
  max-height: 90px;
  opacity: 1;
  overflow: hidden;
  transition:
    max-height 0.22s ease,
    opacity 0.22s ease,
    padding 0.22s ease,
    border-color 0.22s ease;
}

.member-field:last-child {
  border-bottom: none;
}

.member-field.is-collapsed {
  max-height: 0;
  opacity: 0;
  padding-top: 0;
  padding-bottom: 0;
  border-color: transparent;
}

.member-label {
  color: var(--text-sub);
  font-size: 18px;
}

.member-name {
  min-height: 42px;
  width: 100%;
  max-width: 100%;
  min-width: 0;
  padding: 8px 12px;
  border: 1px solid #c8d8cd;
  border-radius: 8px;
  font-size: 18px;
  outline: none;
  box-sizing: border-box;
  background: #fff;
}

.result-text-wrapper {
  position: relative;
  margin-top: 18px;
  padding: 18px 18px 18px 20px;
  border: 1px solid #c8d8cd;
  border-radius: 18px;
  background: #fbfbf9;
  min-height: 72px;
}

.result-text {
  white-space: pre-wrap;
  word-break: keep-all;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-main);
}

.copy-result-button {
  position: absolute;
  top: 16px;
  right: 16px;
  border: 1px solid var(--green-500);
  background: var(--green-500);
  color: #fff;
  padding: 8px 14px;
  border-radius: 12px;
  cursor: pointer;
  font-size: 14px;
  transition:
    filter 0.2s ease,
    transform 0.2s ease;
}

.copy-result-button:hover {
  filter: brightness(1.08);
  transform: translateY(-1px);
}

.copy-result-button:active {
  transform: translateY(0);
}

.member-name:focus {
  border-color: var(--green-500);
  box-shadow: 0 0 0 3px rgba(51, 187, 51, 0.12);
}

/* Activity section */
.activity-block {
  padding: 0 0 4px;
  max-height: 560px;
  opacity: 1;
  overflow: hidden;
  transition:
    max-height 0.24s ease,
    opacity 0.24s ease,
    margin 0.24s ease,
    padding 0.24s ease,
    border-color 0.24s ease;
}

.activity-block + .activity-block {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.activity-block.is-collapsed {
  max-height: 0;
  opacity: 0;
  margin-top: 0;
  padding-top: 0;
  padding-bottom: 0;
  border-top-color: transparent;
}

.activity-title-row {
  position: relative;
}

.activity-title-row .activity-title {
  width: 100%;
}

.activity-remove-btn {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 34px;
  height: 34px;
  border: 1px solid #d6d6d6;
  border-radius: 8px;
  background: #fff;
  color: #88928d;
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
}

.activity-remove-btn:hover {
  color: #fff;
  background: #b05050;
  border-color: #b05050;
}

.activity-header {
  margin-top: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface-soft);
}

.activity-header-label,
.activity-header-suffix {
  color: var(--text-sub);
  font-size: 20px;
}

.activity-input {
  min-height: 50px;
  padding: 10px 12px;
  border: 1px solid #c8d8cd;
  border-radius: 10px;
  outline: none;
  font-size: 20px;
  background: #fff;
  text-align: center;
  box-sizing: border-box;
  -webkit-appearance: none;
  appearance: none;
}

#activity-spender {
  width: min(260px, 100%);
}

#activity-money {
  width: min(220px, 100%);
}

.activity-input:focus {
  border-color: var(--green-500);
  box-shadow: 0 0 0 4px rgba(51, 187, 51, 0.14);
}

.activity-member-title {
  margin-top: 16px;
  color: var(--text-sub);
  font-size: 18px;
  text-align: center;
}

.activity-members {
  margin-top: 10px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}

.activity-add-btn {
  display: block;
  margin: 14px auto 0;
  border: 1px solid var(--green-600);
  border-radius: 10px;
  background: #fff;
  color: var(--green-700);
  font-size: 20px;
  padding: 8px 20px;
  cursor: pointer;
  transition:
    background-color 0.2s ease,
    color 0.2s ease;
}

.activity-add-btn:hover {
  background-color: var(--green-100);
}

.activity-member-input {
  display: none;
}

.activity-member-label {
  display: inline-block;
  min-width: 96px;
  padding: 10px 14px;
  text-align: center;
  font-size: 18px;
  color: var(--green-700);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  cursor: pointer;
  transition:
    background-color 0.15s ease,
    color 0.15s ease,
    border-color 0.15s ease;
}

.activity-member-input:checked + .activity-member-label {
  color: #fff;
  background: linear-gradient(145deg, var(--green-500), var(--green-700));
  border-color: var(--green-600);
}

/* Input container */
.input-container {
  margin: 16px 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(220px, 1fr));
  gap: 14px;
  justify-items: stretch;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background-color: var(--surface-soft);
  background-image:
    linear-gradient(0deg, rgba(196, 220, 204, 0.45) 1px, transparent 1px),
    linear-gradient(90deg, rgba(196, 220, 204, 0.35) 1px, transparent 1px);
  background-size: 38px 38px;
}

.input-container span {
  font-size: 44px;
  color: var(--green-600);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  display: grid;
  place-items: center;
  min-height: 64px;
}

.input-container input,
.input-container select {
  padding: 12px 14px;
  width: 100%;
  min-height: 64px;
  background-color: #fff;
  border: 1px solid #c8d8cd;
  border-radius: 10px;
  outline: none;
  text-align: center;
  transition:
    border-color 0.2s ease,
    box-shadow 0.2s ease;
  font-size: 22px;
  box-sizing: border-box;
  -webkit-appearance: none;
  appearance: none;
}

.input-container input:focus,
.input-container select:focus {
  border-color: var(--green-500);
  box-shadow: 0 0 0 4px rgba(51, 187, 51, 0.14);
}

/* Additional payments */
#additional {
  display: block;
  margin: 14px auto 0;
  border: 1px solid var(--green-600);
  border-radius: 10px;
  background: #fff;
  color: var(--green-700);
  font-size: 20px;
  padding: 8px 20px;
  cursor: pointer;
  transition:
    background-color 0.2s ease,
    color 0.2s ease;
}

#additional:hover {
  background-color: var(--green-100);
}

.additional-container {
  margin-top: 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
}

.additional-field {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr auto auto;
  gap: 10px;
  align-items: center;
  padding: 12px;
  background: #fff;
  border-bottom: 1px solid #e3ece6;
  max-height: 260px;
  opacity: 1;
  overflow: hidden;
  transition:
    max-height 0.22s ease,
    opacity 0.22s ease,
    padding 0.22s ease,
    border-color 0.22s ease,
    gap 0.22s ease;
}

.additional-field:last-child {
  border-bottom: none;
}

.additional-field.is-collapsed {
  max-height: 0;
  opacity: 0;
  padding-top: 0;
  padding-bottom: 0;
  border-color: transparent;
  gap: 0;
}

.additional-select,
.additional-field input {
  min-height: 42px;
  width: 100%;
  max-width: 100%;
  min-width: 0;
  border: 1px solid #c8d8cd;
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 18px;
  outline: none;
}

.additional-field input[type="number"] {
  width: 140px;
  max-width: 140px;
  min-width: 0;
}

.additional-select:focus,
.additional-field input:focus {
  border-color: var(--green-500);
  box-shadow: 0 0 0 3px rgba(51, 187, 51, 0.12);
}

.additional-field span {
  color: var(--text-sub);
  font-size: 18px;
}

.additional-remove-btn {
  width: 34px;
  height: 34px;
  border: 1px solid #d6d6d6;
  border-radius: 8px;
  background: #fff;
  color: #88928d;
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
}

.additional-remove-btn:hover {
  color: #fff;
  background: #b05050;
  border-color: #b05050;
}

/* Cut(절삭) container */
.cut-container {
  margin: auto;
  height: 100%;
  display: inline-flex;
  overflow: hidden;
  border-radius: 12px;
  box-shadow: inset 0 0 0 1px var(--line);
}

.cut-input {
  display: none;
}

.cut-label {
  padding: 10px 18px;
  font-size: 20px;
  color: var(--green-700);
  background: #fff;
  cursor: pointer;
  transition:
    background-color 0.15s ease,
    color 0.15s ease;
}

.cut-label:not(:last-of-type) {
  border-right: 1px solid var(--line);
}

.cut-label:hover {
  background: var(--green-100);
}

.cut-input:checked + .cut-label {
  color: #fff;
  background: linear-gradient(145deg, var(--green-500), var(--green-700));
}

/* Extra options */
#money-italic {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  color: var(--text-sub);
  font-size: 18px;
  margin-top: 16px;
}

#money-italic input[type="checkbox"] {
  width: 20px;
  height: 20px;
  accent-color: var(--green-600);
}

/* Result container */
.btn-container {
  margin-top: 16px;
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 28px;
}

.result-btn {
  all: unset;
  text-align: center;
  width: 220px;
  height: 78px;
  background: linear-gradient(140deg, var(--green-500), var(--green-700));
  border-radius: 14px;
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease,
    filter 0.2s ease;
  box-shadow: 0 10px 18px rgba(15, 122, 49, 0.22);
  cursor: pointer;
}

.canvas-actions {
  display: flex;
  justify-content: center;
  gap: 14px;
  margin: 16px auto 0;
  flex-wrap: wrap;
}

.canvas-action-button {
  all: unset;
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-width: 160px;
  height: 52px;
  padding: 0 18px;
  background: linear-gradient(145deg, var(--green-500), var(--green-700));
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  border-radius: 14px;
  cursor: pointer;
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease,
    filter 0.2s ease;
  box-shadow: 0 8px 16px rgba(15, 122, 49, 0.18);
}

.canvas-action-button:hover {
  transform: translateY(-1px);
  filter: brightness(1.04);
  box-shadow: 0 10px 18px rgba(15, 122, 49, 0.22);
}

.canvas-action-button:active {
  transform: translateY(0);
}

.result-btn:hover {
  box-shadow: 0 14px 22px rgba(15, 122, 49, 0.24);
  transform: translateY(-2px);
  filter: brightness(1.03);
}

.result-btn:active {
  transform: translateY(0);
}

.chart-container {
  width: min(1080px, calc(100% - 24px));
  margin: 0 auto;
}

#result-canvas {
  display: block;
  width: 100%;
  max-width: 100%;
  text-align: center;
  margin: 16px auto 0;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 12px;
  box-sizing: border-box;
}

.result-container {
  display: grid;
  gap: 8px;
  font-size: 20px;
}

#result {
  display: grid;
  gap: 6px;
}

#result > div {
  padding: 8px 10px;
  border: 1px solid #d8e7dd;
  border-radius: 8px;
  background: #fafdfb;
}

.setting-subtitle {
  margin-top: 16px;
  color: var(--text-sub);
  font-size: 18px;
}

.cut-wrap {
  text-align: center;
  margin-top: 12px;
}

/* Scroll button container */
.scroll-container {
  position: fixed;
  right: 18px;
  bottom: 18px;
  left: auto;
  z-index: 50;
}

#scroll-up,
#scroll-down {
  font-size: 38px;
  color: var(--green-700);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid #cde2d4;
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease;
}

#scroll-up:hover,
#scroll-down:hover {
  box-shadow: 0 8px 16px rgba(18, 44, 22, 0.2);
  transform: translateY(-2px);
}

@media (max-width: 800px) {
  :root {
    --section-gap: 120px;
  }
  body {
    padding: 18px 0 70px;
    background:
      radial-gradient(
        circle at top center,
        rgba(255, 255, 255, 0.08) 0%,
        transparent 35%
      ),
      linear-gradient(0deg, rgba(255, 255, 255, 0.08) 1px, transparent 1px),
      linear-gradient(90deg, rgba(255, 255, 255, 0.08) 1px, transparent 1px),
      radial-gradient(
        circle at top center,
        #1ed07a 0%,
        #1c6644 45%,
        #78e2b1 100%
      );
    background-size:
      100% 100%,
      40px 40px,
      40px 40px;
  }

  .page-block {
    width: 100%;
  }

  form {
    width: 100%;
  }

  .input-container {
    grid-template-columns: 1fr;
    padding: 14px;
  }

  .member-section {
    padding: 18px 12px;
  }

  .app-section {
    padding: 18px 12px;
    border-radius: 0px;
  }

  h1 {
    font-size: 36px;
    padding: 16px 0;
    margin-bottom: 14px;
  }

  h2 {
    font-size: 28px;
  }

  .intro {
    font-size: 19px;
    line-height: 1.75;
    border-radius: 20px;
  }

  .member-field {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .member-label,
  .activity-header-label,
  .activity-header-suffix,
  .activity-member-title,
  .setting-subtitle,
  #money-italic {
    font-size: 20px;
  }

  .activity-header {
    display: grid;
    grid-template-columns: 1fr;
    justify-items: center;
    gap: 8px;
    padding: 12px;
  }

  .activity-title-row {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
  }

  .activity-remove-btn {
    position: static;
    transform: none;
  }

  #activity-spender,
  #activity-money {
    width: 100%;
  }

  .member-name,
  .activity-input,
  .additional-select,
  .additional-field input {
    min-height: 50px;
    font-size: 20px;
  }

  .activity-member-label,
  .cut-label {
    min-height: 48px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 19px;
  }

  .additional-field {
    grid-template-columns: 1fr;
    gap: 6px;
    max-height: none;
  }

  .additional-field input[type="number"] {
    width: 100%;
    max-width: 100%;
  }

  .additional-field span {
    justify-self: center;
  }

  .additional-remove-btn {
    justify-self: end;
    grid-column: 1;
  }

  .cut-container {
    display: grid;
    grid-template-columns: repeat(2, minmax(100px, 1fr));
    width: min(360px, 100%);
  }

  .cut-label:not(:last-of-type) {
    border-right: none;
  }

  .cut-label {
    border: 1px solid var(--line);
    text-align: center;
  }

  #additional,
  .activity-add-btn {
    width: 100%;
    min-height: 52px;
    font-size: 21px;
  }

  .result-btn {
    width: min(320px, 100%);
    height: 86px;
    font-size: 22px;
  }

  .btn-container {
    margin-top: 18px;
  }

  .result-container {
    font-size: 22px;
  }
}