:root {
  --sidebar-w: 272px;
  --bg: #f4f5f7;
  --panel: #16181d;
  --panel-soft: #22252c;
  --panel-line: #2e323b;
  --ink: #1b1d22;
  --ink-soft: #666c78;
  --line: #dfe2e8;
  --accent: #3b6cf6;
  --danger: #d6453d;
  --radius: 10px;
}

* { box-sizing: border-box; }

/* 클래스에 display 를 주면 브라우저 기본 [hidden] 규칙을 이겨 버린다. 못박아 둔다. */
[hidden] { display: none !important; }

html, body {
  height: 100%;
  margin: 0;
}

body {
  background: var(--bg);
  color: var(--ink);
  font: 14px/1.5 "Pretendard", "Apple SD Gothic Neo", "Malgun Gothic", system-ui, sans-serif;
  overflow: hidden;
}

button { font: inherit; cursor: pointer; }

kbd {
  background: var(--panel-soft);
  border: 1px solid var(--panel-line);
  border-radius: 4px;
  padding: 1px 5px;
  font-size: 11px;
}

.app {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  height: 100%;
}

/* ---------- 사이드바 ---------- */

.sidebar {
  display: flex;
  flex-direction: column;
  min-height: 0;
  background: var(--panel);
  color: #e6e8ec;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 18px 18px 14px;
  font-weight: 700;
  letter-spacing: -0.2px;
}

.brand-mark { color: var(--accent); }

.side-actions {
  display: flex;
  gap: 6px;
  padding: 0 14px 12px;
}

.new-btn,
.new-folder-btn {
  padding: 10px;
  border: 1px dashed var(--panel-line);
  border-radius: var(--radius);
  background: var(--panel-soft);
  color: #e6e8ec;
  font-weight: 600;
  white-space: nowrap;
  transition: border-color .15s, color .15s;
}

.new-btn { flex: 1; }

.new-btn:hover,
.new-folder-btn:hover {
  border-color: var(--accent);
  color: #fff;
}

.search { padding: 0 14px 10px; }

.search input {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--panel-line);
  border-radius: 8px;
  background: #0f1116;
  color: #e6e8ec;
  font: inherit;
}

.search input:focus {
  outline: none;
  border-color: var(--accent);
}

.post-list {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: 4px 10px 12px;
}

/* ---------- 폴더 ---------- */

.folder { margin-bottom: 4px; }

.folder-head {
  display: flex;
  align-items: center;
  border-radius: 8px;
  border: 1px solid transparent;
}

.folder-head:hover { background: #1c1f26; }

.folder-head.drag-over {
  border-color: var(--accent);
  background: rgba(59, 108, 246, .18);
}

.folder.active > .folder-head > .folder-toggle > strong { color: #fff; }

.folder-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  flex: 1;
  min-width: 0;
  padding: 7px 8px;
  border: 0;
  background: none;
  color: #aab0bb;
  text-align: left;
}

.folder-toggle .caret {
  width: 11px;
  font-size: 9px;
  line-height: 1;
  opacity: .65;
}

.folder-toggle strong {
  flex: 1;
  min-width: 0;
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .2px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.folder-count {
  padding: 1px 6px;
  border-radius: 999px;
  background: var(--panel-soft);
  font-size: 11px;
  opacity: .8;
}

.folder-more {
  padding: 6px 8px;
  border: 0;
  border-radius: 8px;
  background: none;
  color: #777d89;
  opacity: 0;
}

.folder-head:hover .folder-more { opacity: 1; }
.folder-more:hover { color: #fff; }

.folder-body { padding: 2px 0 4px 14px; }

.folder-body .list-empty {
  padding: 4px 10px 6px;
  font-size: 12px;
}

.hit-folder {
  display: inline-block;
  margin-top: 2px;
  padding: 0 6px;
  border-radius: 999px;
  background: rgba(255, 255, 255, .09);
  font-size: 10.5px;
}

.post-item {
  display: block;
  width: 100%;
  text-align: left;
  padding: 9px 10px;
  margin-bottom: 2px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: #c8ccd4;
  line-height: 1.35;
  cursor: grab;
}

.post-item:hover { background: var(--panel-soft); }

.post-item.active {
  background: var(--accent);
  color: #fff;
}

.post-item strong {
  display: block;
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.post-item span {
  font-size: 11.5px;
  opacity: .62;
}

.list-empty {
  padding: 18px 12px;
  color: #777d89;
  font-size: 13px;
}

.sidebar-foot {
  padding: 10px 16px 14px;
  border-top: 1px solid var(--panel-line);
  color: #777d89;
  font-size: 11.5px;
}

.account {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 8px;
}

.account > span {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: #aab0bb;
  font-weight: 600;
}

.link-btn {
  padding: 0;
  border: 0;
  background: none;
  color: #777d89;
  font-size: 11.5px;
  text-decoration: underline;
}

.link-btn:hover { color: #fff; }

/* ---------- 공유 화면 (읽기 전용) ---------- */

.share-body {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.share-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 20px;
  border-bottom: 1px solid var(--line);
  background: #fff;
}

.share-title { flex: 1; min-width: 0; }

.share-title h1 {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.share-title p {
  margin: 2px 0 0;
  color: var(--ink-soft);
  font-size: 12px;
}

/* ---------- 로그인 ---------- */

.login-body {
  display: grid;
  place-items: center;
  background: var(--panel);
}

.login-card {
  width: min(360px, calc(100vw - 32px));
  padding: 32px 28px;
  border: 1px solid var(--panel-line);
  border-radius: 16px;
  background: #1b1e25;
  color: #e6e8ec;
}

.login-card .brand { padding: 0 0 10px; }

.login-lead {
  margin: 0 0 22px;
  color: #8e95a2;
  font-size: 12.5px;
  line-height: 1.6;
}

.login-card label {
  display: block;
  margin-bottom: 5px;
  font-size: 12px;
  font-weight: 600;
  color: #aab0bb;
}

.login-card input {
  width: 100%;
  margin-bottom: 16px;
  padding: 10px 12px;
  border: 1px solid var(--panel-line);
  border-radius: 8px;
  background: #0f1116;
  color: #e6e8ec;
  font: inherit;
}

.login-card input:focus {
  outline: none;
  border-color: var(--accent);
}

.login-card .btn {
  width: 100%;
  padding: 11px;
  font-weight: 600;
}

.login-error {
  margin: 0 0 14px;
  color: #ff8a81;
  font-size: 12.5px;
}

/* ---------- 본문 ---------- */

.stage {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
}

.toolbar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 18px;
  border-bottom: 1px solid var(--line);
  background: #fff;
}

.toolbar-title { min-width: 0; flex: 1; }

.toolbar-title h1 {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.toolbar-title p {
  margin: 2px 0 0;
  color: var(--ink-soft);
  font-size: 12px;
}

.toolbar-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.btn {
  padding: 7px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  white-space: nowrap;
}

.btn:hover { background: #f0f2f6; }

.btn.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}

.btn.primary:hover { background: #2f5ce0; }

.btn.icon { padding: 7px 10px; }

.folder-select {
  max-width: 160px;
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  font: inherit;
}

.menu { position: relative; }

.menu-pop {
  position: absolute;
  right: 0;
  top: calc(100% + 6px);
  z-index: 20;
  min-width: 164px;
  padding: 5px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: 0 10px 28px rgba(16, 20, 30, .14);
}

.menu-pop button {
  display: block;
  width: 100%;
  padding: 8px 10px;
  border: 0;
  border-radius: 7px;
  background: none;
  text-align: left;
}

.menu-pop button:hover { background: #f0f2f6; }
.menu-pop button.danger { color: var(--danger); }

.menu-pop hr {
  margin: 4px 6px;
  border: 0;
  border-top: 1px solid var(--line);
}

/* 폴더 메뉴는 사이드바 밖으로 띄워야 잘리지 않는다. 위치는 JS 가 잡는다. */
.menu-pop.floating {
  position: fixed;
  right: auto;
  top: auto;
  z-index: 70;
}

.frame-wrap {
  position: relative;
  flex: 1;
  min-height: 0;
  background: #fff;
}

#frame {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
}

.exit-hint {
  position: absolute;
  left: 50%;
  bottom: 28px;
  transform: translateX(-50%);
  padding: 8px 16px;
  border-radius: 999px;
  background: rgba(10, 12, 16, .78);
  color: #fff;
  font-size: 13px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .3s;
}

.frame-wrap:fullscreen .exit-hint.show { opacity: 1; }

/* ---------- 빈 화면 ---------- */

.empty {
  display: grid;
  place-items: center;
  flex: 1;
  min-height: 0;
  padding: 24px;
}

.empty-card {
  max-width: 420px;
  padding: 40px 32px;
  border: 2px dashed var(--line);
  border-radius: 16px;
  background: #fff;
  text-align: center;
}

.empty-icon {
  font-size: 30px;
  color: var(--accent);
}

.empty-card h2 {
  margin: 12px 0 6px;
  font-size: 17px;
}

.empty-card p {
  margin: 0 0 18px;
  color: var(--ink-soft);
}

/* ---------- 드롭 오버레이 ---------- */

.drop-overlay {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: grid;
  place-items: center;
  background: rgba(20, 26, 40, .55);
  backdrop-filter: blur(2px);
}

.drop-card {
  padding: 36px 56px;
  border: 3px dashed #fff;
  border-radius: 18px;
  color: #fff;
  font-size: 19px;
  font-weight: 700;
  text-align: center;
}

.drop-card small {
  display: block;
  margin-top: 6px;
  font-size: 14px;
  font-weight: 500;
  opacity: .85;
}

/* ---------- 토스트 ---------- */

.toasts {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 80;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  padding: 10px 16px;
  border-radius: 9px;
  background: #1b1f28;
  color: #fff;
  box-shadow: 0 8px 22px rgba(10, 14, 22, .25);
  font-size: 13px;
}

.toast.error { background: var(--danger); }

/* ---------- 좁은 화면 ---------- */

@media (max-width: 720px) {
  /* 좁은 화면에서는 목록을 위로 접어 올린다. 숨기면 글을 고를 길이 없어진다. */
  .app {
    grid-template-columns: 1fr;
    grid-template-rows: minmax(0, 38vh) minmax(0, 1fr);
  }
  .sidebar-foot { display: none; }
  .toolbar { flex-wrap: wrap; }
}