:root {
  --font-family: -apple-system, BlinkMacSystemFont, "Pretendard Variable", Pretendard, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-monospace: "JetBrains Mono", "Fira Code", Consolas, "Courier New", monospace;
  
  /* Obsidian Dark Theme Default */
  --bg-primary: #1e1e1e;
  --bg-secondary: #252525;
  --bg-tertiary: #2d2d2d;
  --bg-sidebar: #181818;
  --bg-hover: #333333;
  --bg-active: #3a3a3a;
  
  --text-normal: #dcddde;
  --text-muted: #888888;
  --text-faint: #555555;
  --text-accent: #7b68ee;
  --text-accent-hover: #9370db;
  
  --interactive-accent: #7b68ee;
  --interactive-accent-rgb: 123, 104, 238;
  --interactive-hover: #6a5acd;
  
  --border-color: #333333;
  --border-subtle: #282828;
  --shadow-popup: 0 8px 24px rgba(0, 0, 0, 0.4);
  
  --sidebar-width: 280px;
  --right-panel-width: 320px;
  --header-height: 52px;
}

[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f6f8fa;
  --bg-tertiary: #ebeff3;
  --bg-sidebar: #f0f2f5;
  --bg-hover: #e4e7eb;
  --bg-active: #d8dce2;
  
  --text-normal: #24292f;
  --text-muted: #57606a;
  --text-faint: #8c959f;
  --text-accent: #5e48e8;
  --text-accent-hover: #4834d4;
  
  --interactive-accent: #5e48e8;
  --interactive-accent-rgb: 94, 72, 232;
  --interactive-hover: #4834d4;
  
  --border-color: #d0d7de;
  --border-subtle: #e1e4e8;
  --shadow-popup: 0 8px 24px rgba(0, 0, 0, 0.12);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-normal);
  line-height: 1.6;
  overflow: hidden;
  height: 100vh;
  width: 100vw;
  user-select: none;
}

/* App Container */
.app-container {
  display: flex;
  flex-direction: column;
  height: 100vh;
  width: 100vw;
}

/* Header */
.app-header {
  height: var(--header-height);
  background-color: var(--bg-sidebar);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  z-index: 100;
  flex-shrink: 0;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  background: none;
  border: none;
  color: var(--text-normal);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  padding: 6px 10px;
  border-radius: 6px;
  transition: background 0.15s ease;
}

.logo-btn:hover {
  background-color: var(--bg-hover);
}

.logo-icon {
  width: 20px;
  height: 20px;
  color: var(--interactive-accent);
}

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-muted);
}

.breadcrumb-sep {
  color: var(--text-faint);
}

.breadcrumb-current {
  color: var(--text-normal);
  font-weight: 500;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  background: none;
  border: 1px solid transparent;
  border-radius: 6px;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-icon:hover {
  background-color: var(--bg-hover);
  color: var(--text-normal);
}

.btn-search {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-muted);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-search:hover {
  background-color: var(--bg-hover);
  border-color: var(--interactive-accent);
  color: var(--text-normal);
}

.btn-search kbd {
  background-color: var(--bg-tertiary);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 11px;
  font-family: var(--font-monospace);
  color: var(--text-faint);
}

/* In-App Sync Button */
.btn-sync {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background-color: rgba(var(--interactive-accent-rgb), 0.12);
  border: 1px solid rgba(var(--interactive-accent-rgb), 0.3);
  border-radius: 6px;
  color: var(--interactive-accent);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-sync:hover {
  background-color: var(--interactive-accent);
  color: #ffffff;
}

.btn-sync.syncing svg {
  animation: spin 1s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* Main Layout */
.app-body {
  display: flex;
  flex: 1;
  overflow: hidden;
  position: relative;
}

/* Left Sidebar */
.app-sidebar {
  width: var(--sidebar-width);
  background-color: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  transition: width 0.2s ease, transform 0.2s ease;
}

.sidebar-header {
  padding: 12px;
  border-bottom: 1px solid var(--border-subtle);
}

.sidebar-search-input {
  width: 100%;
  padding: 6px 10px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-normal);
  font-size: 13px;
  outline: none;
}

.sidebar-search-input:focus {
  border-color: var(--interactive-accent);
}

.sidebar-tree {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
}

/* Tree Items */
.tree-item {
  margin: 2px 0;
}

.tree-row {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 8px;
  border-radius: 6px;
  font-size: 13px;
  color: var(--text-muted);
  cursor: pointer;
  transition: background 0.1s ease, color 0.1s ease;
}

.tree-row:hover {
  background-color: var(--bg-hover);
  color: var(--text-normal);
}

.tree-row.active {
  background-color: var(--bg-active);
  color: var(--interactive-accent);
  font-weight: 500;
}

.tree-row .folder-arrow {
  width: 14px;
  height: 14px;
  transition: transform 0.15s ease;
  color: var(--text-faint);
}

.tree-row.expanded .folder-arrow {
  transform: rotate(90deg);
}

.tree-children {
  padding-left: 16px;
  border-left: 1px dashed var(--border-subtle);
  margin-left: 12px;
}

/* Center Content */
.app-content {
  flex: 1;
  overflow-y: auto;
  background-color: var(--bg-primary);
  display: flex;
  flex-direction: column;
  position: relative;
  user-select: text;
}

.content-container {
  max-width: 820px;
  width: 100%;
  margin: 0 auto;
  padding: 40px 32px 100px 32px;
}

.note-header {
  margin-bottom: 28px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-subtle);
}

.note-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--text-normal);
  margin-bottom: 8px;
  line-height: 1.25;
}

.note-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 12px;
  color: var(--text-muted);
}

/* Markdown Rendering */
.markdown-body {
  font-size: 15px;
  color: var(--text-normal);
  line-height: 1.75;
}

.markdown-body h1, .markdown-body h2, .markdown-body h3, .markdown-body h4 {
  color: var(--text-normal);
  font-weight: 600;
  margin-top: 24px;
  margin-bottom: 12px;
  line-height: 1.3;
}

.markdown-body h1 { font-size: 26px; border-bottom: 1px solid var(--border-subtle); padding-bottom: 8px; }
.markdown-body h2 { font-size: 21px; }
.markdown-body h3 { font-size: 17px; }
.markdown-body h4 { font-size: 15px; }

.markdown-body p { margin-bottom: 14px; }
.markdown-body ul, .markdown-body ol { padding-left: 24px; margin-bottom: 14px; }
.markdown-body li { margin-bottom: 4px; }

/* Obsidian Wikilinks */
.wikilink {
  color: var(--text-accent);
  text-decoration: none;
  border-bottom: 1px dashed var(--interactive-accent);
  padding: 0 2px;
  border-radius: 3px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.wikilink:hover {
  color: var(--text-accent-hover);
  background-color: rgba(var(--interactive-accent-rgb), 0.1);
  border-bottom-style: solid;
}

/* Obsidian Callouts */
.callout {
  border-left: 4px solid var(--interactive-accent);
  background-color: var(--bg-secondary);
  border-radius: 6px;
  padding: 12px 16px;
  margin: 16px 0;
}

.callout-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 14px;
  margin-bottom: 6px;
}

.callout.note { border-left-color: #086ddd; background-color: rgba(8, 109, 221, 0.08); }
.callout.note .callout-title { color: #086ddd; }

.callout.tip { border-left-color: #00bf8c; background-color: rgba(0, 191, 140, 0.08); }
.callout.tip .callout-title { color: #00bf8c; }

.callout.warning { border-left-color: #ec7500; background-color: rgba(236, 117, 0, 0.08); }
.callout.warning .callout-title { color: #ec7500; }

.callout.danger, .callout.caution { border-left-color: #e93147; background-color: rgba(233, 49, 71, 0.08); }
.callout.danger .callout-title { color: #e93147; }

.callout.quote { border-left-color: #a8a8a8; background-color: var(--bg-secondary); }

/* Task List Checkboxes */
.task-list-item {
  list-style-type: none;
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin-left: -18px;
}

.task-checkbox {
  margin-top: 4px;
  cursor: pointer;
  accent-color: var(--interactive-accent);
}

/* Code Blocks */
.markdown-body pre {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 14px 18px;
  overflow-x: auto;
  margin: 16px 0;
  font-family: var(--font-monospace);
  font-size: 13px;
}

.markdown-body code {
  background-color: var(--bg-secondary);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: var(--font-monospace);
  font-size: 13px;
  color: var(--interactive-accent);
}

.markdown-body hr {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 24px 0;
}

/* Right Panel */
.app-right-panel {
  width: var(--right-panel-width);
  background-color: var(--bg-sidebar);
  border-left: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  transition: width 0.2s ease;
}

.right-panel-tabs {
  display: flex;
  border-bottom: 1px solid var(--border-subtle);
  background-color: var(--bg-sidebar);
}

.panel-tab {
  flex: 1;
  padding: 10px 0;
  text-align: center;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: all 0.15s ease;
}

.panel-tab:hover {
  color: var(--text-normal);
  background-color: var(--bg-hover);
}

.panel-tab.active {
  color: var(--interactive-accent);
  border-bottom-color: var(--interactive-accent);
}

.right-panel-content {
  flex: 1;
  overflow-y: auto;
  padding: 12px;
}

/* Graph Canvas */
#graph-canvas {
  width: 100%;
  height: 240px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
}

/* Search Modal */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  display: flex;
  justify-content: center;
  padding-top: 80px;
  z-index: 1000;
}

.search-modal {
  width: 580px;
  max-width: 90vw;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  box-shadow: var(--shadow-popup);
  display: flex;
  flex-direction: column;
  max-height: 70vh;
  overflow: hidden;
}

.search-modal-header {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 10px;
}

.search-modal-input {
  flex: 1;
  background: none;
  border: none;
  color: var(--text-normal);
  font-size: 16px;
  outline: none;
}

.search-modal-results {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
}

.search-result-item {
  padding: 10px 12px;
  border-radius: 6px;
  cursor: pointer;
  margin-bottom: 4px;
  transition: background 0.1s ease;
}

.search-result-item:hover, .search-result-item.selected {
  background-color: var(--bg-hover);
}

.search-result-title {
  font-weight: 600;
  font-size: 14px;
  color: var(--text-normal);
  margin-bottom: 2px;
}

.search-result-snippet {
  font-size: 12px;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Toast Notification */
.toast-msg {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--interactive-accent);
  color: var(--text-normal);
  padding: 10px 18px;
  border-radius: 8px;
  font-size: 13px;
  box-shadow: var(--shadow-popup);
  z-index: 2000;
  animation: slideUp 0.2s ease;
}

@keyframes slideUp {
  from { transform: translateY(20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

/* Scrollbars */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-faint);
}