:root {
  font-family: system-ui, "맑은 고딕", sans-serif;
  color: #30382f;
  background: #f7f6f2;
  line-height: 1.7;
  font-size: 16px;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
}
header {
  padding: 24px max(24px, calc((100vw - 1200px) / 2));
  background: white;
  border-bottom: 1px solid #ddd;
}
header b {
  font-size: 22px;
}
.badge {
  display: inline-block;
  margin-left: 16px;
  padding: 4px 12px;
  border-radius: 20px;
  background: #e6f4f0;
  color: #0f766e;
  font-size: 13px;
}
main {
  max-width: 1250px;
  margin: auto;
  padding: 24px;
}
section {
  background: white;
  border: 1px solid #e1e4ee;
  border-radius: 16px;
  padding: 28px;
  margin-bottom: 24px;
}
h1 {
  font-size: 38px;
  line-height: 1.35;
  margin: 0 0 18px;
}
h2 {
  font-size: 23px;
  margin-top: 0;
}
h3 {
  font-size: 17px;
}
label {
  display: block;
  margin: 10px 0 4px;
}
input:not([type="checkbox"]),
select {
  font: inherit;
  max-width: 100%;
  width: 100%;
  padding: 10px;
  border: 1px solid #aeb6c8;
  border-radius: 8px;
  min-height: 44px;
}
input[type="checkbox"] {
  width: 20px;
  height: 20px;
  vertical-align: middle;
}
button {
  font: inherit;
  background: #344b3c;
  color: white;
  border: 0;
  border-radius: 8px;
  min-height: 44px;
  padding: 10px 18px;
  cursor: pointer;
  margin: 8px 8px 8px 0;
}
button.secondary {
  background: #edf1e6;
  color: #344b3c;
}
button:disabled {
  opacity: 0.45;
  cursor: default;
}
:focus-visible {
  outline: 3px solid #0f766e;
  outline-offset: 3px;
}
.row {
  display: flex;
  gap: 12px;
  align-items: end;
  flex-wrap: wrap;
}
.row > input {
  flex: 1;
  min-width: 250px;
}
.row > label {
  flex: 1;
  min-width: 160px;
}
.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.workspace {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 24px;
  margin-top: 20px;
}
pre {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  font: inherit;
  background: #f3f4ed;
  padding: 16px;
  border-radius: 8px;
  max-height: 500px;
  overflow: auto;
}
#posts {
  max-height: 570px;
  overflow: auto;
}
.post {
  border: 1px solid #e1e4ee;
  border-radius: 10px;
  padding: 12px;
  margin-bottom: 10px;
}
.post button {
  background: transparent;
  color: #344b3c;
  text-align: left;
  margin: 0;
}
.muted,
footer {
  color: #626e83;
  font-size: 14px;
}
.attachment {
  padding: 12px;
  border-top: 1px solid #ddd;
}
summary {
  cursor: pointer;
  padding: 12px;
}
a {
  color: #344b3c;
}
#mapping {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}
details {
  border: 1px solid #e1e4ee;
  padding: 8px;
  border-radius: 8px;
}
footer {
  padding: 12px;
}
@media (max-width: 760px) {
  main {
    padding: 12px;
  }
  section {
    padding: 18px;
  }
  .grid,
  .workspace {
    grid-template-columns: 1fr;
  }
  #mapping {
    grid-template-columns: 1fr 1fr;
  }
  h1 {
    font-size: 28px;
  }
  header {
    padding: 18px;
  }
  .badge {
    margin-left: 0;
  }
  button {
    width: 100%;
  }
}

/* Archive study: local system fonts, CSS-only decorative papers. */
:root { --border: #e3e4d9; --surface: #fffefa; --accent: #344b3c; }
html { scroll-padding-top: 24px; }
a, button, input, select, summary { -webkit-tap-highlight-color: transparent; }
button { border: 1px solid transparent; transition: background .15s; }
button:hover:not(:disabled) { background: #253b2c; }
button.secondary { border-color: #d5ddcc; }
button.secondary:hover:not(:disabled) { background: #dfe6d9; }
:focus-visible { outline-color: #91652e; }
[hidden] { display: none !important; }
.skip-link { position: fixed; left: 16px; top: -100px; z-index: 10; background: var(--surface); padding: 12px; }
.skip-link:focus { top: 12px; }
.sidebar { position: fixed; inset: 0 auto 0 0; width: 232px; padding: 36px 22px; background: #efeee6; border-right: 1px solid var(--border); overflow-y: auto; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.brand strong { font-size: 18px; line-height: 1.45; letter-spacing: -.7px; }
.brand small { display: block; font-size: 12px; color: #626d5d; margin-top: 8px; }
.brand-mark { display: grid; place-items: center; width: 42px; height: 48px; flex-shrink: 0; color: white; background: var(--accent); border-radius: 12px 12px 4px 12px; font-size: 26px; }
.nav-caption { margin: 48px 12px 12px; font-size: 12px; color: #626d5d; }
.nav-item { display: flex; justify-content: space-between; align-items: center; padding: 14px 12px; margin: 6px 0; border-radius: 8px; color: #56614f; text-decoration: none; }
.nav-item small { font-family: Georgia, serif; font-size: 13px; }
.nav-item:hover, .nav-item.active { background: #dfe6d9; color: #344b3c; }
.nav-item.active { font-weight: 600; }
.sidebar-note { margin: 68px 8px 0; border-top: 1px solid #d6dacb; padding-top: 24px; font-size: 14px; }
.sidebar-note p { color: #626d5d; font-size: 13px; }
.sidebar-note span { font-size: 10px; letter-spacing: 1.5px; color: #626d5d; }
.utility { margin-left: 232px; padding: 24px 44px 0; border: 0; background: transparent; }
.utility > div { display: flex; align-items: center; flex-wrap: wrap; gap: 12px; }
.utility b { font-size: 14px; font-weight: 500; color: #626d5d; }
.utility p { font-size: 13px; color: #626d5d; margin: 8px 0 0; }
.badge { margin: 0; background: #e4ebdc; color: #405936; font-size: 12px; }
main { margin-left: 232px; max-width: 1450px; padding: 0 44px 36px; }
.hero { display: flex; justify-content: space-between; align-items: center; gap: 20px; padding: 42px 0 38px; }
.eyebrow { font-size: 11px; letter-spacing: 2px; color: #65735b; }
h1 { font-family: Georgia, '바탕', serif; font-weight: 500; font-size: clamp(34px, 3.3vw, 50px); letter-spacing: -2px; margin: 18px 0; line-height: 1.4; }
.hero p { color: #626d5d; max-width: 570px; margin-bottom: 0; }
.hero-art { position: relative; width: 230px; height: 235px; flex-shrink: 0; margin-right: 28px; }
.art-orbit { position: absolute; inset: 16px 0 0; border-radius: 50%; background: #e9ecdf; }
.paper { position: absolute; width: 145px; height: 180px; top: 22px; left: 40px; border: 1px solid #d5dbc9; border-radius: 3px; box-shadow: 0 14px 28px #344b3c0c; }
.paper-back { background: #d3dec6; transform: rotate(-13deg); }
.paper-front { background: #fffefa; transform: rotate(8deg); padding: 17px; }
.paper small { font-size: 8px; letter-spacing: 1px; color: #647259; }
.paper b { display: block; font-family: '바탕', serif; font-size: 23px; font-weight: 400; line-height: 1.35; margin: 12px 0; }
.paper i { display: block; height: 2px; margin: 9px 0; background: #e1e4d7; }
.paper i:last-of-type { width: 65%; }
.paper span { font-size: 9px; color: #647259; }
.route-links { display: flex; gap: 24px; padding: 0 4px 14px; flex-wrap: wrap; }
.route-links a { text-decoration: none; border-bottom: 2px solid #809472; padding: 8px 0; }
.route-links span { margin-left: 10px; font-size: 12px; color: #626d5d; }
section { background: var(--surface); border-color: var(--border); border-radius: 14px; padding: 28px; box-shadow: 0 6px 24px #344b3c03; scroll-margin-top: 24px; }
h2 { font-size: 22px; letter-spacing: -.6px; font-weight: 600; margin-bottom: 12px; }
section > p { color: #626d5d; font-size: 14px; }
input:not([type='checkbox']), select { border-color: #bcc6b3; color: #30382f; background: #fafbf6; min-width: 0; }
input[type='checkbox'] { accent-color: var(--accent); }
input[type='file'] { font-size: 14px; padding: 12px; border-style: dashed; background: #f5f7ee; }
input::file-selector-button { font: inherit; color: var(--accent); background: #e5ebdc; border: 0; border-radius: 4px; padding: 7px 10px; margin-right: 10px; cursor: pointer; }
label { font-size: 14px; }
details { border-color: var(--border); padding: 6px 12px; margin-top: 14px; background: #fafbf6; }
summary { color: #526548; font-size: 14px; }
details p { font-size: 14px; color: #626d5d; }
pre { border: 1px solid #e8eadd; font-size: 14px; line-height: 1.85; }
pre:empty { display: none; }
#stats { border-left: 3px solid #809472; padding: 12px 16px; background: #edf1e6; color: #344b3c; }
.workspace { grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr); gap: 18px; }
.workspace > div, .grid > div, #mapping > div { min-width: 0; }
#posts, #detail { border: 1px solid var(--border); border-radius: 10px; background: var(--surface); }
#detail { padding: 20px; overflow-wrap: anywhere; }
#detail h3 { font-family: '바탕', serif; font-size: 24px; font-weight: 500; }
#posts { min-height: 160px; }
.post { border: 0; border-bottom: 1px solid var(--border); border-radius: 0; margin: 0; padding: 18px; }
.post.active { background: #edf1e6; border-left: 3px solid #809472; padding-left: 15px; }
.post button { display: block; font-weight: 600; padding: 6px 0; width: 100%; }
.post button:hover:not(:disabled) { background: transparent; color: #203c24; text-decoration: underline; }
.post label, .post small { color: #626d5d; font-size: 13px; overflow-wrap: anywhere; }
.post p { font-size: 14px; margin: 8px 0; color: #56614f; overflow-wrap: anywhere; }
.empty-state { padding: 26px; color: #626d5d; font-size: 14px; }
#organize .grid h3 { font-size: 15px; color: #526548; margin: 24px 0 8px; }
#save { border-top: 3px solid #809472; }
.attachment { border-color: var(--border); }
footer { border-top: 1px solid var(--border); color: #626d5d; font-size: 13px; }
@media (min-width: 1680px) { main { margin-right: auto; } }
@media (max-width: 1100px) { .sidebar { width: 200px; padding: 28px 16px; } main, .utility { margin-left: 200px; } main { padding: 0 24px 28px; } .utility { padding: 24px 24px 0; } .hero-art { width: 180px; margin-right: 0; } .paper { left: 20px; } .workspace { grid-template-columns: 1fr; } }
@media (max-width: 760px) {
  html { scroll-padding-top: 12px; }
  .sidebar { position: static; width: auto; padding: 18px; border-right: 0; border-bottom: 1px solid var(--border); }
  .brand strong { font-size: 16px; } .brand strong br { display: none; } .brand small { margin-top: 3px; }
  .brand-mark { width: 36px; height: 40px; }
  .nav-caption, .sidebar-note { display: none; }
  .sidebar nav { display: flex; gap: 4px; margin-top: 16px; }
  .nav-item { padding: 10px 7px; font-size: 13px; flex: 1; justify-content: center; white-space: nowrap; margin: 0; }
  .nav-item small { display: none; }
  main { margin: 0; padding: 0 16px 24px; } .utility { margin: 0; padding: 18px 18px 0; }
  .hero { padding: 30px 4px; } .hero-art { display: none; } h1 { font-size: 36px; }
  .hero p { font-size: 14px; } .eyebrow { font-size: 10px; letter-spacing: 1.3px; }
  .route-links { gap: 16px; font-size: 14px; } .route-links span { display: none; }
  section { padding: 20px 16px; scroll-margin-top: 12px; }
  h2 { font-size: 20px; } .grid, .workspace { grid-template-columns: minmax(0, 1fr); }
  .row > input, .row > label { min-width: 0; flex-basis: 100%; }
  #mapping { grid-template-columns: minmax(0, 1fr); }
  button { width: 100%; margin-right: 0; } #detail { padding: 16px; }
}
@media (prefers-reduced-motion: reduce) { button { transition: none; } }

/* 📲 앱 설치 버튼과 안내 창 */
header > div {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
header .install-button {
  width: auto;
  margin: 0 0 0 auto;
  padding: 6px 14px;
  border: 0;
  border-radius: 999px;
  background: #0f766e;
  color: white;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
}
header .install-button:hover {
  background: #115e59;
}
header .install-button[hidden] {
  display: none;
}
header .qr-button {
  margin-left: 6px;
  background: white;
  color: #0f766e;
  border: 1px solid #b7ddd5;
}
header .qr-button:hover {
  background: #effaf7;
}
.qr-dialog {
  text-align: center;
  width: min(520px, calc(100vw - 32px));
}
.qr-image {
  display: block;
  width: min(100%, 62vh, 420px);
  height: auto;
  margin: 8px auto;
  image-rendering: pixelated;
}
.qr-url {
  margin: 0 0 4px;
  font-family: ui-monospace, Menlo, Consolas, monospace;
  word-break: break-all;
}
.install-dialog {
  width: min(440px, calc(100vw - 32px));
  max-height: calc(100vh - 32px);
  padding: 22px 20px 18px;
  border: 1px solid #e1e4ee;
  border-radius: 16px;
  color: #172033;
  word-break: keep-all;
}
.install-dialog::backdrop {
  background: rgba(23, 32, 51, 0.6);
}
.install-dialog h2 {
  font-size: 20px;
  margin: 0;
}
.install-sub {
  margin: 2px 0 12px;
  color: #626e83;
  font-size: 14px;
}
.install-dialog ol {
  padding-left: 22px;
}
.install-dialog [hidden] {
  display: none;
}
.install-note {
  padding: 10px 12px;
  border-radius: 10px;
  background: #f1f4f9;
  color: #626e83;
  font-size: 14px;
}
.install-external,
.install-close {
  display: block;
  width: 100%;
  padding: 12px;
  border-radius: 12px;
  text-align: center;
  font-weight: 700;
}
.install-external {
  margin-top: 12px;
  background: #0f766e;
  color: white;
  text-decoration: none;
}
.install-close {
  margin-top: 14px;
}
footer .copyright {
  margin: 8px 0 0;
}
@media (max-width: 760px) {
  header .install-button {
    width: auto;
    padding: 5px 12px;
    font-size: 13px;
  }
}
/* 📱 휴대폰: 맨 윗줄 = 제목 + 앱 설치·QR, 아랫줄 = 상태 표시 */
@media (max-width: 520px) {
  header > div {
    column-gap: 6px;
  }
  header > div::after {
    content: "";
    order: 1;
    flex-basis: 100%;
    height: 0;
  }
  header b {
    font-size: 17px;
    margin-right: auto;
  }
  header .install-button {
    margin: 0;
    padding: 5px 10px;
    font-size: 12.5px;
  }
  header .qr-button {
    margin-left: 0;
  }
  .badge {
    order: 2;
  }
}

/* Install/share controls follow the archive palette. */
.utility .install-button, .install-external { background: #344b3c; }
.utility .qr-button { background: #fffefa; color: #344b3c; border-color: #bcc6b3; }
.install-dialog { background: #fffefa; color: #30382f; border-color: #e3e4d9; }
.install-note { background: #edf1e6; color: #626d5d; }
@media (max-width:760px) { .utility > div { gap:6px; } .utility b { font-size:13px; } .utility .install-button { font-size:12px; padding:5px 9px; min-height:36px; } }
/* 📱 휴대폰: 앱 설치·QR을 화면 맨 윗줄(정리함 이름 오른쪽)에 둔다 */
.utility-key { display: contents; }
@media (max-width: 760px) {
  body { position: relative; }
  .sidebar { padding-right: 150px; }
  .sidebar nav { margin-right: -132px; }
  .utility .utility-key { position: absolute; top: 20px; right: 18px; display: flex; gap: 6px; }
  .utility .utility-key .install-button { margin: 0; }
  .install-wide { display: none; }
}
@media (max-width: 360px) {
  .sidebar { padding-left: 14px; padding-right: 140px; }
  .sidebar nav { margin-right: -126px; }
  .brand { gap: 8px; }
  .brand strong { font-size: 15px; }
  .utility .utility-key { right: 14px; gap: 4px; }
  .utility .utility-key .install-button { padding: 5px 8px; }
}
@media (max-width: 340px) {
  .brand-mark { display: none; }
}