:root {
  /* ===== Default: DARK theme (기본 테마) ===== */
  --bg: #0b0c0f;
  --panel: #121318;
  --panel-2: #181a20;
  --panel-3: #1f232b;
  --text: #e6e8ef;
  --muted: #9aa1ae;
  --primary: #6ea8fe;
  --accent: #5eead4;
  --border: #2a2f39;
  --danger: #ff6b6b;
  --success: #7ad69f;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  --radius: 12px;
  --sidebar-w: 260px;
  --navbar-h: 56px;

  /* Markdown/editor borders (tone-down) */
  --md-border: #2d3340;
  --md-border-focus: #3b4354;
  --md-shadow-focus: 0 0 0 3px rgba(110, 168, 254, 0.15);

  /* layers */
  --z-sidebar: 1000;
  --z-dropdown: 10150;
  --z-popover: 10160;
  --z-overlay: 10170;
  --z-modal: 10180;
  --z-toast: 10190;
  --z-peek: 10200;
}

/* ===== Explicit LIGHT theme (체크박스로 강제 전환) html data-theme="light" 속성 붙으면 적용 // js : setAttribute("data-theme", "light") 테마전환 // 토큰 변환 스타일 ===== */
:root[data-theme="light"] {
  --bg: #f6f7fb;
  --panel: #ffffff;
  --panel-2: #f7f7fb;
  --panel-3: #f0f2f7;
  --text: #1c1f29;
  --muted: #4b5563;
  --primary: #2563eb;
  --accent: #06b6d4;
  --border: #e5e7eb;

  --md-border: #d1d5db;
  --md-border-focus: #bfc6d1;
  --md-shadow-focus: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", system-ui, -apple-system, Segoe UI, Roboto, Ubuntu,
    Cantarell, Noto Sans, sans-serif;
  font-size: 14px;
  line-height: 1.45;

  /*폰트랜더링 최적화*/
  -webkit-font-smoothing: antialiased; /*브라우저 글꼴 매끄럽게*/
  -moz-osx-font-smoothing: grayscale; /*크롬 사파리 등 회색조 안티앨리어싱*/
  text-rendering: optimizeLegibility; /*고급폰트*/
  transition: background-color 0.25s ease, color 0.25s ease;
}

button {
  border: none;
  background: none;
  color: inherit;
}

/* === App Grid Layout === */
.app {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  grid-template-rows: var(--navbar-h) 1fr;
  height: 100dvh; /* dvh 동적 뷰포트 높이를 안정적 전체화면 확보를 위해 반영*/
  width: 100vw;
}

/* 줄 넘버 동일하게 하기 : 누락된 라인 있는지 체크, CSS 작성 완료 후 삭제 예정*/

/* === Sidebar === */
.sidebar {
  grid-column: 1;
  grid-row: 1 / span 2;
  position: relative;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), transparent),
    var(--panel);
  border-right: 1px solid var(--border);
  overflow: visible; /*드롭다운, 팝오버 UI 대응*/
  z-index: var(--z-sidebar); /*--z-sidebar:1000*/
  transition: transform 0.25s ease; /*자연스런 슬라이딩*/
}

.sidebar.is-collapsed {
  transform: translateX(-100%); /*자연스럽게 좌측으로 사라짐*/
}

.sidebar .inner {
  position: relative;
  padding: 8px 6px 16px 6px;
  height: 100%;
  overflow: auto; /*없으면 문서 많을 때 잘림*/
}
.collapse-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  color: var(--muted);
  cursor: pointer;
  backdrop-filter: blur(4px); /*반투명, 흐림 효과*/
}
.collapse-btn:hover {
  background: var(--panel-3);
  color: var(--text);
}

.resize-handle {
  /*사이드바 오른쪽 드래그 핸들*/
  position: absolute;
  top: 0;
  right: 0;
  width: 4px;
  height: 100%;
  cursor: ew-resize; /*좌우 양방향 화살표 모양*/
  background: linear-gradient(
    /* 미묘하게 얇은 선느낌 */ 90deg,
    transparent,
    rgba(255, 255, 255, 0.06),
    transparent
  );
  opacity: 0.6;
}
.resize-handle:hover {
  opacity: 1;
}

/* Floating peek button 사이드바 접혔을때 peek 햄버거 버튼 */
.peek-btn {
  /*스크롤해도 항상 같은 자리*/
  position: fixed;
  left: 8px;
  top: calc(var(--navbar-h) + 10px);
  width: 36px;
  height: 36px;
  display: none; /*원래는 안보였다가*/
  place-items: center;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  box-shadow: var(--shadow);
  z-index: var(--z-peek);
  cursor: pointer;
}
.sidebar.is-collapsed ~ .peek-btn {
  /* 사이드바 닫혔을때만 나오게*/
  display: grid;
}

/* Navbar (contrast improved)  */
.navbar {
  /*스크롤 상관 없이 항상 화면 우측 상단*/
  grid-column: 2;
  grid-row: 1;
  position: sticky;
  top: 0;
  height: var(--navbar-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: var(--panel-2);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 6px 14px rgba(0, 0, 0, 0.22);
  color: var(--text);
}

.breadcrumbs {
  color: var(--text);
  font-weight: 700;
  letter-spacing: 0.2px;
  padding-left: 6px;
}



.menu-btn {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  color: var(--muted); /*muted 기본은 옅게 표시*/
  cursor: pointer;
}
.menu-btn:hover {
  background: var(--panel-3);
  color: var(--text);
}

/* ======== Main Content ========*/
main {
  grid-column: 2;
  grid-row: 2;
  overflow:auto; 
}
.dov-canvas{
  max-width: 940px; /* 대형 문서 편집기 공통:최대폭 900~1000제한 */
  margin: 0 auto 120px;
  padding: 18px 20px 80px;
}

/* ======== Utilities ======== */
.muted{
  color: var(--muted);
}
.row{
  display: flex;
  align-items:center;
  gap: 8px;
}
.row-end { /*모달확인버튼*/
  display: flex;
  align-items: center;
  gap: 8px; 
  justify-content: flex-end;
}
.kbd{  /* 키보드 단축키 표시 */
 border : 1px solid var(--border);
 background: var(--panel-2);
 padding: 2px 6px;
 border-radius: 8px; 
 font-family: ui-monospace, monospace;
font-size: 11px;
color: var(--muted);
}

/* ======= Buttons ======== */
.btn {
  padding: 8px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), transparent),
    var(--panel);
  color: var(--text);
  cursor: pointer;
  transition: transform 0.05s ease;
}
.btn.small {
  padding: 6px 8px;
  font-size: 12px;
}
.btn.primary {
  background: var(--primary);
  border-color: color-mix(in oklab, var(--primary) 70%, #000 30%);
  color: white;
}
.btn.danger {
  background: var(--danger);
  color: white;
}
.btn:active {
  transform: translateY(1px);
}


/* ===== User box ===== */
.user-box {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px;
  border-radius: 16px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), transparent),
    var(--panel-2);
  margin: 8px;
}
.avatar { /*포인트 그라데이션*/
  width: 28px;
  height: 28px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  box-shadow: var(--shadow);
}
.user-meta {
  display: flex;
  flex-direction: column;
}
.user-meta small {
  color: var(--muted);
}

/* ===== Action items ===== */
.nav-items {
  padding: 6px;
}
.item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  color: var(--muted);
  padding: 10px 10px;
  border-radius: 12px;
  cursor: pointer;
  font-size: 14px;
}
.item:hover {
  background: var(--panel-3);
  color: var(--text);
}
.item.active {
  background: color-mix(in oklab, var(--primary) 14%, transparent);
  color: var(--text);
}
.item .right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 6px;
}

/* ===== Group titles ===== */
.group-title {
  padding: 8px 10px;
  font-weight: 800;
  color: var(--muted);
  opacity: 0.95;    /*살짝 낮춰 부드러운 느낌*/
  letter-spacing: 0.3px;
  text-transform: uppercase; /*모두 대문자*/
  font-size: 12px;
}


/* ===== Document tree ===== */
.doc-list {
  padding: 6px;
}
.tree-row {   /* 문서하나를 나타내는 줄 */
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border-radius: 12px;
  cursor: pointer;
  color: var(--muted);
}
.tree-row:hover {
  background: var(--panel-3);
  color: var(--text);
}
.tree-row.active {  /* 한층 더 강조 */
  background: color-mix(in oklab, var(--primary) 14%, transparent);
  color: var(--text);
}

.tree-row.dragover-top {
  box-shadow: inset 0 2px 0 0 var(--primary);
}
.tree-row.dragover-bottom {
  box-shadow: inset 0 -2px 0 0 var(--primary);
}
.tree-row.dragover-inside {  /* 전체 점선 사용자 안정감 위함 */
  outline: 2px dashed color-mix(in oklab, var(--primary) 70%, transparent);
}
.caret {
  width: 18px;
  text-align: center;
  opacity: 0.6;
  border-radius: 8px;
}
.caret:hover {
  background: var(--panel-3);
  opacity: 1; /* 클릭 확신감 %*/
}

/* Icon presence styles */
.doc-icon {
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  font-size: 16px;
  line-height: 1;
}
.doc-icon.has-icon {
  background: var(--panel-3);
  color: var(--text);
}
.doc-icon.no-icon {
  border: 1px dashed var(--border);
  color: var(--muted);
  font-size: 12px;
}
.label {
  font-size: 14px;
}
.label.has-icon {
  font-weight: 700;
}
.label.no-icon {
  font-weight: 500;
  opacity: 0.9;
}

.tree-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 6px;
}
.ghost {
  opacity: 0;
  transition: opacity 0.15s ease;
}
.tree-row:hover .ghost {
  opacity: 1;
}
.label-edit { /* 수정 중 : 제목 더블 클릭시 수정 모드 느낌 */
  border: 1px dashed var(--border);
  background: var(--panel-2);
  color: var(--text);
  border-radius: 8px;
  padding: 2px 6px;
}

.children {
  margin-left: 14px;  /* 트리구조 핵심 컨테이너 : 직관적 시각적 계층 트리 */
}

/* ===== Dropdown menu (portal) 보조 인터페이스 ===== */
.dropdown-btn {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  color: var(--muted);
  cursor: pointer;
}
.dropdown-btn:hover {
  background: var(--panel-3);
  color: var(--text);
}
.dropdown-menu { /*body에 직접 붙어 더 있는 메뉴 박스 (포털)*/
  position: fixed;
  min-width: 240px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 6px;
  display: none;
  z-index: var(--z-dropdown);
}
.dropdown-menu.open {   /*open*/
  display: block;
}

.menu-item { /*드롭다운 메뉴*/
  padding: 10px;
  border-radius: 10px;
  color: var(--muted);
  cursor: pointer;
}
.menu-item:hover {
  background: var(--panel-3);
  color: var(--text);
}
.menu-sep {
  height: 1px;
  background: var(--border);
  margin: 6px 0;
}

/* ===== Popover (Trash / Emoji) via portal ===== */
.popover {
  position: fixed;
  width: 320px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 8px;
  display: none;
  z-index: var(--z-popover);
}
.popover.open {
  display: block;
}
.popover .search {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 4px 8px;
}
.popover input {
  all: unset;  /*브라우저 기본 스타일 제거*/
  flex: 1;
  padding: 4px;
}

.trash-list {
  margin-top: 8px;
  max-height: 320px;
  overflow: auto;
}
.trash-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 8px 10px;
  border-radius: 10px;
  cursor: pointer;
}
.trash-row:hover {
  background: var(--panel-3);
}
.trash-actions {
  display: flex;
  gap: 6px;
}

.icon-btn {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  color: var(--muted);
  cursor: pointer;
}
.icon-btn:hover {
  background: var(--panel-3);
  color: var(--text);
}
.emoji-grid {
  display: grid;
  grid-template-columns: repeat(10, 1fr);
  gap: 4px;
  max-height: 260px;
  overflow: auto;
}
.emoji-grid button {
  font-size: 18px;
  padding: 6px;
  border-radius: 10px;
  cursor: pointer;
}
.emoji-grid button:hover {
  background: var(--panel-3);
}

/* ===== Overlays ( 모달 : 검색 / 설정 / 즐겨찾기 ) ===== */
.overlay {  /*화면 전체 덮개 컨테이너 */
  position: fixed;   inset: 0;   /*전체 고정 덮개 */
  display: none;   /* 열릴때 display: flex; */
  place-items: center;
  background: rgba(0, 0, 0, 0.5); /*클릭 안되고 어둡게*/
  padding: 16px;
  z-index: var(--z-overlay);
}
.search-modal,
.settings-modal,
.favorites-modal {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow); /*떠 있는 효과*/
  width: min(640px, 92vw); /*최대, 작을때*/
  padding: 16px;
}

.search-input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--panel-2);
  color: var(--text);
  margin-bottom: 8px;
}

.search-results {
  max-height: 320px;
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--panel);
}

.favorites-list {
  max-height: 360px;
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--panel);
}

.fav-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-bottom: 1px dashed var(--border);
  cursor: pointer;
}

.fav-row:hover {
  background: var(--panel-3);
}

.fav-actions {
  margin-left: auto;
  display: flex;
  gap: 6px;
}

.hint { /*검색 모달 안내 문구 */
  margin-top: 8px;
  color: var(--muted);
  font-size: 12px;
}

/* ===== Settings modal 레이아웃 개선 ===== */
.settings-modal .settings-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}
.settings-modal h3 {
  margin: 0;
  font-size: 18px;
}

.settings-modal .settings-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px 16px;
  align-items: center;
}
.settings-modal .settings-row {
  display: contents; /* 제목/컨트롤을 grid에 바로 배치 */
}

.settings-modal .label {
  font-weight: 600;
  color: var(--text);
}

.settings-modal .sublabel {
  color: var(--muted);
  font-size: 12px;
  margin-top: 2px;
}

.switch {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 6px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--panel-2);
}

.switch input {
  width: 16px;
  height: 16px;
}

/* ===== Confirm modal ===== */
.modal-overlay { /*모달 배경 반투명 검은색 : 중요한 알림 */ 
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal);
}

.modal {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 16px;
  width: min(420px, 90vw);
  box-shadow: var(--shadow);
}

.modal h3 {
  margin: 0 0 10px;
}

/* ===== Toasts 화면 아래 오른쪽, 작은 피드백을 빠르게 보여주는 : 가벼운 알림 ===== */
.toasts { 
  position: fixed;
  right: 16px;
  bottom: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: var(--z-toast);
}

.toast {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-left: 4px solid var(--primary); /*알림의포인트 blue, red, green 으로 구분해서*/
  padding: 10px 12px;
  border-radius: 12px;
  box-shadow: var(--shadow);
  min-width: 220px;
  transition: opacity 0.2s ease; /*토스트가 사라질때 자연스럽게*/
}

.toast.success {
  border-left-color: var(--success);
}

.toast.error {
  border-left-color: var(--danger);
}

/* ===== Editor ===== */
.doc-header {
  display: flex;
  gap: 12px;
  align-items: center;
  margin: 6px 0 10px;
}
.doc-icon-big {
  font-size: 42px; 
  line-height: 1;
  border-radius: 12px;
  padding: 6px 10px;
  background: var(--panel);
  border: 1px solid var(--border);
  cursor: pointer;
}

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

.title-input {
  all: unset;
  display: block;
  font-size: 28px; /* 문서 타이틀 : 크게 */
  font-weight: 800;
  padding: 4px 2px;
  border-bottom: 1px dashed transparent;
}

.title-input:focus {
  border-bottom-color: var(--md-border-focus);
}

.meta {
  font-size: 12px;
  color: var(--muted);
  margin-top: 4px;
}

.toolbar {
  position: sticky;
  top: 8px;
  display: flex;
  gap: 6px;
  align-items: center;
  flex-wrap: wrap;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 6px;
  box-shadow: var(--shadow);
}

.tbtn {
  padding: 6px 10px;
  border-radius: 10px;
  cursor: pointer;
  color: var(--muted);
}

.tbtn:hover {
  background: var(--panel-3);
  color: var(--text);
}

.sep {
  width: 1px;
  height: 20px;
  background: var(--border);
}

.editor {
  min-height: 600px;
  margin-top: 10px;
  padding: 12px 14px;
  background: var(--panel);
  border: 1px solid var(--md-border);
  border-radius: 14px;
  box-shadow: var(--shadow);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.editor:focus-within {
  border-color: var(--md-border-focus);
  box-shadow: var(--shadow), var(--md-shadow-focus);
}

.editor:focus {
  outline: none;
}

.editor :where(h1, h2, h3) {
  margin: 12px 0 6px;
}

.editor :where(ul, ol) {
  padding-left: 24px;
}

.editor pre {
  background: #0f1220;
  color: #e1e8ff;
  padding: 10px;
  border-radius: 12px;
  border: 1px solid var(--md-border);
  overflow: auto;
}

.editor blockquote {
  border-left: 4px solid var(--md-border); /*좌측 라인으로 인용 표시*/
  margin: 8px 0;
  padding: 6px 10px;
  color: var(--muted);
  background: color-mix(in oklab, var(--panel) 92%, transparent);
  border-radius: 10px;
}

.editor code {
  background: color-mix(in oklab, var(--panel-3) 70%, transparent);
  border: 1px solid var(--md-border);
  padding: 2px 6px;
  border-radius: 8px;
}

/* ===== Responsive polish ===== */
@media (min-width: 1280px) {
  :root {
    --sidebar-w: 300px;
    --navbar-h: 60px;
  }
  .title-input {
    font-size: 32px;
  }
  .doc-canvas {
    max-width: 1040px;
  }
}

@media (max-width: 1024px) {
  .doc-canvas {
    max-width: 880px;
    padding: 16px 14px 64px;
  }
  .toolbar {
    gap: 4px;
    padding: 6px;
  }
  .title-input {
    font-size: 26px;
  }
}

@media (max-width: 768px) {
  .navbar {
    padding: 8px 10px;
  }
  .breadcrumbs {
    font-size: 13px;
  }
  .btn.small {
    padding: 5px 7px;
    font-size: 11px;
  }
  .toolbar {
    top: 6px;
  }
  .editor {
    min-height: 420px;
  }
  .peek-btn {
    left: 6px;
    top: calc(var(--navbar-h) + 8px);
    width: 34px;
    height: 34px;
  }
  .settings-modal {
    width: min(560px, 94vw);
  }
}

@media (max-width: 480px) {
  .doc-canvas {
    padding: 14px 10px 56px;
  }
  .title-input {
    font-size: 22px;
  }
  .doc-icon-big {
    font-size: 36px;
  }
  .item {
    padding: 8px;
  }
  .tree-row {
    padding: 7px 8px;
  }
  .dropdown-menu {
    min-width: 200px;
  }
  .popover {
    width: 280px;
  }
  .search-modal,
  .settings-modal,
  .favorites-modal {
    width: min(520px, 96vw);
    padding: 12px;
  }
  .search-input {
    padding: 10px 12px;
  }
}

#sidebar {
  width: var(--sidebar-w);
  transition: width 0.25s ease;
}

.navbar .menu-btn {
  display: none;
}

.sidebar.is-collapsed ~ .navbar .menu-btn {
  display: grid;
}

.sidebar.is-collapsed ~ .peek-btn {
  display: none;
}

/*to-do*/
  #editor label input:checked + span {
    text-decoration: line-through;
    opacity: 0.6;
  }