/* ============================================
   OS Shell Theme — Main Stylesheet
   ============================================ */

/* --- Reset & Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  /* BTTF Palette
     Midnight blue sky, electric cyan time-travel glow,
     orange/amber fire trails, DeLorean metallic gray */

  /* Desktop — neutral dark */
  --desktop-bg: #0a0a0a;
  --desktop-gradient: linear-gradient(160deg, #0a0a0a 0%, #111111 40%, #161616 100%);

  /* Menubar */
  --menubar-bg: rgba(14, 14, 14, 0.88);
  --menubar-text: #d0d0d0;
  --menubar-height: 32px;

  /* Window */
  --window-bg: #141414;
  --window-border: #2a2a2a;
  --window-titlebar: #0e0e0e;
  --window-title-text: #888888;
  --window-radius: 10px;
  --window-shadow: 0 8px 32px rgba(0, 0, 0, 0.5),
                   0 2px 8px rgba(0, 0, 0, 0.3);

  /* Sidebar */
  --sidebar-bg: #0e0e0e;
  --sidebar-width: 240px;
  --sidebar-border: #2a2a2a;
  --sidebar-text: #888888;
  --sidebar-hover: #1e1e1e;
  --sidebar-active: #2a2a2a;

  /* Content */
  --content-bg: #141414;
  --content-text: #d0ccc4;
  --content-muted: #888078;
  --content-heading: #f0ece4;
  --content-link: #e8a040;
  --content-link-hover: #f0b860;
  --content-code-bg: #0e0e0e;
  --content-border: #2a2a2a;

  /* Accent — bright amber (flux capacitor glow) */
  --accent: #e8a040;
  --accent-hover: #f0b860;
  --accent-subtle: rgba(232, 160, 64, 0.10);

  /* Secondary accent — coral (flux capacitor red knobs) */
  --accent-warm: #e06060;
  --accent-warm-hover: #e87878;
  --accent-warm-subtle: rgba(224, 96, 96, 0.10);

  /* Dock */
  --dock-bg: rgba(14, 14, 14, 0.78);
  --dock-border: rgba(42, 42, 42, 0.5);
  --dock-icon: #888888;
  --dock-active: #e8a040;

  /* Traffic lights */
  --light-red: #ff3d00;
  --light-yellow: #ffd600;
  --light-green: #00e676;

  /* Tags — coral red */
  --tag-bg: rgba(224, 96, 96, 0.10);
  --tag-text: #e06060;
  --tag-border: rgba(224, 96, 96, 0.20);

  /* Typography */
  --font-sans: 'Pretendard Variable', 'Pretendard', 'Inter', 'Noto Sans KR', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'IBM Plex Mono', 'SF Mono', 'Fira Code', monospace;

  /* Transitions */
  --transition-fast: 120ms ease;
  --transition-normal: 200ms ease;
}

html {
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  color: var(--content-text);
  background: var(--desktop-bg);
  background: var(--desktop-gradient);
  line-height: 1.6;
  min-height: 100svh;
  overflow: hidden;
  padding-top: env(safe-area-inset-top);
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
}

a {
  color: inherit;
  text-decoration: none;
}

/* Auto-hiding overlay scrollbars */
* {
  scrollbar-width: thin;
  scrollbar-color: transparent transparent;
}

*:hover {
  scrollbar-color: var(--sidebar-hover) transparent;
}

*::-webkit-scrollbar {
  width: 6px;
}

*::-webkit-scrollbar-track {
  background: transparent;
}

*::-webkit-scrollbar-thumb {
  background: transparent;
  border-radius: 3px;
}

*:hover::-webkit-scrollbar-thumb {
  background: var(--sidebar-hover);
}

/* --- OS Desktop --- */
.os-desktop {
  display: flex;
  flex-direction: column;
  height: 100svh;
  padding: var(--menubar-height) 0 0;
}

/* --- Menu Bar (macOS-style) --- */
.os-menubar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--menubar-height);
  background: var(--menubar-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 12px;
  z-index: 100;
  border-bottom: 1px solid var(--window-border);
  font-size: 13px;
  user-select: none;
}

.menubar-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.menubar-logo {
  color: var(--accent);
  display: flex;
  align-items: center;
}

.menubar-title {
  font-weight: 600;
  color: var(--menubar-text);
  font-size: 13px;
}

.menubar-item {
  color: var(--content-muted);
  font-size: 13px;
  padding: 2px 8px;
  border-radius: 4px;
  transition: all var(--transition-fast);
}

.menubar-item:hover {
  color: var(--menubar-text);
  background: rgba(255, 255, 255, 0.06);
}

.menubar-item.active {
  color: var(--menubar-text);
}

.menubar-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.menubar-clock {
  color: var(--content-muted);
  font-family: var(--font-mono);
  font-size: 12px;
}

/* --- Window --- */
.os-window {
  flex: 1;
  margin: 12px;
  background: var(--window-bg);
  border-radius: var(--window-radius);
  border: 1px solid var(--window-border);
  box-shadow: var(--window-shadow);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-height: 0;
}

.window-titlebar {
  height: 40px;
  background: var(--window-titlebar);
  border-bottom: 1px solid var(--window-border);
  display: flex;
  align-items: center;
  padding: 0 14px;
  gap: 10px;
  flex-shrink: 0;
  user-select: none;
}

.window-titlebar .explorer-toggle {
  background: none;
  border: none;
  color: var(--sidebar-text);
  cursor: pointer;
  padding: 4px;
  display: flex;
  align-items: center;
  border-radius: 4px;
  transition: background var(--transition-fast);
}

.window-titlebar .explorer-toggle:hover {
  background: var(--sidebar-hover);
  color: var(--content-text);
}

.traffic-lights {
  display: flex;
  gap: 7px;
  align-items: center;
}

.light {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  display: block;
}

.light.red { background: var(--light-red); }
.light.yellow { background: var(--light-yellow); }
.light.green { background: var(--light-green); }

.window-title {
  flex: 1;
  text-align: center;
  color: var(--window-title-text);
  font-family: var(--font-mono);
  font-size: 12px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.window-actions {
  width: 60px;
}

.window-body {
  flex: 1;
  display: flex;
  min-height: 0;
  overflow: hidden;
}

/* --- File Explorer Sidebar --- */
.file-explorer {
  width: var(--sidebar-width);
  background: var(--sidebar-bg);
  border-right: 1px solid var(--sidebar-border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  flex-shrink: 0;
  transition: width var(--transition-normal);
}

.file-explorer.collapsed {
  width: 0;
  border-right: none;
}

.explorer-header {
  height: 36px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 12px;
  border-bottom: 1px solid var(--sidebar-border);
  flex-shrink: 0;
}

.explorer-title {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--sidebar-text);
}

.explorer-tree {
  flex: 1;
  overflow-y: auto;
  padding: 8px 0;
}


.tree-section {
  margin-bottom: 4px;
}

.tree-section-header {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  font-size: 13px;
  color: var(--sidebar-text);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.tree-section-header:hover {
  background: var(--sidebar-hover);
}

.folder-icon {
  color: var(--accent-warm);
  flex-shrink: 0;
}

.tree-label {
  font-weight: 500;
  color: var(--sidebar-text);
}

.tree-children {
  padding-left: 12px;
}

.tree-file {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 3px 12px 3px 20px;
  font-size: 13px;
  color: var(--sidebar-text);
  transition: all var(--transition-fast);
  border-radius: 0;
}

.tree-file:hover {
  background: var(--sidebar-hover);
  color: var(--content-text);
}

.tree-file.active {
  background: var(--sidebar-active);
  color: var(--content-text);
}

.file-icon {
  color: var(--content-muted);
  flex-shrink: 0;
}

.tree-file.active .file-icon {
  color: var(--accent);
}

/* --- Content Viewer --- */
.content-viewer {
  flex: 1;
  overflow: hidden;
  padding: 0;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

/* --- Home View --- */
.home-view {
  padding: 48px 40px;
  max-width: 900px;
  margin: 0 auto;
  height: 100%;
  overflow-y: auto;
}

.home-header {
  text-align: center;
  margin-bottom: 48px;
}

.home-logo {
  display: block;
  max-width: min(360px, 80%);
  height: auto;
  margin: 0 auto 16px;
}

.home-desc {
  color: var(--content-muted);
  font-size: 15px;
}

/* --- Bio Section --- */
.home-bio {
  max-width: 560px;
  margin: 0 auto 48px;
  padding: 24px;
  background: var(--content-code-bg);
  border: 1px solid var(--content-border);
  border-radius: 10px;
}

.bio-intro h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--content-heading);
  margin-bottom: 2px;
}

.bio-location {
  font-size: 13px;
  color: var(--content-muted);
  font-family: var(--font-mono);
  margin-bottom: 8px;
}

.bio-role {
  font-size: 14px;
  color: var(--content-text);
  margin-bottom: 6px;
}

.bio-desc {
  font-size: 14px;
  color: var(--content-muted);
  line-height: 1.6;
  margin-bottom: 16px;
}

.bio-interests {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
}

.bio-tag {
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--tag-text);
  background: var(--tag-bg);
  border: 1px solid var(--tag-border);
  padding: 2px 8px;
  border-radius: 10px;
}

.bio-links {
  display: flex;
  gap: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--content-border);
}

.bio-link {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--content-link);
  transition: color var(--transition-fast);
}

.bio-link:hover {
  color: var(--content-link-hover);
}

.section-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--content-muted);
  margin-bottom: 16px;
}

.file-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 12px;
}

.file-card {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px;
  background: var(--content-code-bg);
  border: 1px solid var(--content-border);
  border-radius: 8px;
  transition: all var(--transition-normal);
}

.file-card:hover {
  border-color: var(--accent);
  background: var(--accent-subtle);
  box-shadow: 0 0 16px rgba(0, 212, 255, 0.08);
  transform: translateY(-1px);
}

.file-card-icon {
  color: var(--accent-warm);
  flex-shrink: 0;
  padding-top: 2px;
}

.file-card-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.file-card-name {
  font-weight: 500;
  font-size: 14px;
  color: var(--content-text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-card-meta {
  font-size: 12px;
  color: var(--content-muted);
  font-family: var(--font-mono);
}

/* --- List View --- */
.list-view {
  padding: 24px;
  height: 100%;
  overflow-y: auto;
}

.list-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--content-border);
  margin-bottom: 0;
}

.list-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 600;
  color: var(--content-heading);
}

.list-title .folder-icon {
  color: var(--accent-warm);
}

.list-count {
  font-size: 12px;
  color: var(--content-muted);
  font-family: var(--font-mono);
}

.list-toolbar {
  display: grid;
  grid-template-columns: 1fr 160px 100px;
  gap: 12px;
  padding: 8px 12px;
  border-bottom: 1px solid var(--content-border);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--content-muted);
}

.list-items {
  display: flex;
  flex-direction: column;
}

.list-item {
  display: grid;
  grid-template-columns: 1fr 160px 100px;
  gap: 12px;
  padding: 10px 12px;
  align-items: center;
  border-bottom: 1px solid rgba(49, 50, 68, 0.3);
  transition: background var(--transition-fast);
}

.list-item:hover {
  background: var(--accent-subtle);
}

.list-item-name {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--content-text);
  min-width: 0;
}

.list-item-name span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.list-item-name .file-icon {
  color: var(--accent-warm);
  flex-shrink: 0;
}

.list-item-date {
  font-size: 12px;
  color: var(--content-muted);
  font-family: var(--font-mono);
}

.list-item-size {
  font-size: 12px;
  color: var(--content-muted);
  font-family: var(--font-mono);
}

/* --- Document Viewer (Single Post) --- */
.document-viewer {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
}

.doc-tabs {
  display: flex;
  background: var(--sidebar-bg);
  border-bottom: 1px solid var(--content-border);
  flex-shrink: 0;
  overflow-x: auto;
}

.doc-tab {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  font-size: 12px;
  color: var(--content-muted);
  border-right: 1px solid var(--content-border);
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.doc-tab.active {
  background: var(--content-bg);
  color: var(--content-text);
  border-bottom: 2px solid var(--accent-warm);
  margin-bottom: -1px;
}

.doc-tab .file-icon {
  color: var(--accent);
}

.tab-close {
  background: none;
  border: none;
  color: var(--content-muted);
  font-size: 14px;
  cursor: pointer;
  padding: 0 2px;
  line-height: 1;
  border-radius: 3px;
  transition: all var(--transition-fast);
}

.tab-close:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--content-text);
}

.doc-breadcrumb {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 8px 24px;
  font-size: 12px;
  color: var(--content-muted);
  font-family: var(--font-mono);
  border-bottom: 1px solid rgba(49, 50, 68, 0.3);
}

.doc-breadcrumb a {
  color: var(--content-link);
  transition: color var(--transition-fast);
}

.doc-breadcrumb a:hover {
  color: var(--content-link-hover);
}

.breadcrumb-sep {
  color: var(--content-muted);
  opacity: 0.5;
}

.doc-content {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 32px 40px 48px;
  max-width: 800px;
}


.doc-header {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--content-border);
}

.doc-header h1 {
  font-size: 28px;
  font-weight: 700;
  color: var(--content-heading);
  line-height: 1.3;
  margin-bottom: 12px;
}

.doc-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 13px;
  color: var(--content-muted);
  font-family: var(--font-mono);
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 4px;
}

.doc-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 12px;
}

.doc-tag {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--tag-text);
  background: var(--tag-bg);
  border: 1px solid var(--tag-border);
  border-radius: 12px;
  transition: all var(--transition-fast);
}

.doc-tag:hover {
  background: rgba(137, 180, 250, 0.2);
}

/* --- Prose (Article Body) --- */
.prose {
  font-size: 15px;
  line-height: 1.8;
  color: var(--content-text);
}

.prose h2 {
  font-size: 22px;
  font-weight: 600;
  color: var(--content-heading);
  margin: 32px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--content-border);
}

.prose h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--content-heading);
  margin: 24px 0 12px;
}

.prose h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--content-heading);
  margin: 20px 0 8px;
}

.prose p {
  margin-bottom: 16px;
}

.prose a {
  color: var(--content-link);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--transition-fast);
}

.prose a:hover {
  color: var(--content-link-hover);
}

.prose strong {
  font-weight: 600;
  color: var(--content-heading);
}

.prose ul, .prose ol {
  margin-bottom: 16px;
  padding-left: 24px;
}

.prose li {
  margin-bottom: 4px;
}

.prose blockquote {
  border-left: 3px solid var(--accent-warm);
  padding: 12px 20px;
  margin: 16px 0;
  background: var(--accent-warm-subtle);
  border-radius: 0 6px 6px 0;
  color: var(--content-muted);
}

.prose blockquote p:last-child {
  margin-bottom: 0;
}

.prose code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--content-code-bg);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--content-border);
}

.prose pre {
  margin: 16px 0;
  padding: 16px;
  background: var(--content-code-bg);
  border: 1px solid var(--content-border);
  border-radius: 8px;
  overflow-x: auto;
  font-size: 13px;
  line-height: 1.6;
  max-width: 100%;
}

.prose pre code {
  background: none;
  padding: 0;
  border: none;
  font-size: inherit;
}

.prose img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  border: 1px solid var(--content-border);
  margin: 16px 0;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 14px;
  display: block;
  overflow-x: auto;
}

.prose th {
  text-align: left;
  font-weight: 600;
  padding: 8px 12px;
  border-bottom: 2px solid var(--content-border);
  color: var(--content-heading);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.prose td {
  padding: 8px 12px;
  border-bottom: 1px solid rgba(49, 50, 68, 0.3);
}

.prose hr {
  border: none;
  border-top: 1px solid var(--content-border);
  margin: 32px 0;
}

/* --- Document Footer Nav --- */
.doc-footer {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--content-border);
}

.doc-nav {
  display: flex;
  justify-content: space-between;
  gap: 16px;
}

.doc-nav-link {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 16px;
  border: 1px solid var(--content-border);
  border-radius: 8px;
  transition: all var(--transition-normal);
  max-width: 45%;
}

.doc-nav-link:hover {
  border-color: var(--accent);
  background: var(--accent-subtle);
}

.doc-nav-link.next {
  text-align: right;
  margin-left: auto;
}

.nav-label {
  font-size: 12px;
  color: var(--content-muted);
  font-family: var(--font-mono);
}

.nav-title {
  font-size: 14px;
  font-weight: 500;
  color: var(--content-text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* --- Tag Cloud --- */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 16px 0;
}

.tag-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--content-code-bg);
  border: 1px solid var(--content-border);
  border-radius: 8px;
  transition: all var(--transition-normal);
}

.tag-item:hover {
  border-color: var(--accent);
  background: var(--accent-subtle);
}

.tag-name {
  font-size: 14px;
  font-weight: 500;
  color: var(--content-text);
}

.tag-count {
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--accent);
  background: var(--accent-subtle);
  padding: 1px 6px;
  border-radius: 10px;
}

/* --- Dock (Bottom Bar) --- */
.os-dock {
  display: flex;
  justify-content: center;
  padding: 6px 0 calc(10px + env(safe-area-inset-bottom));
  flex-shrink: 0;
}

.dock-items {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 6px 12px;
  background: var(--dock-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--dock-border);
  border-radius: 14px;
}

.dock-item {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  color: var(--dock-icon);
  transition: all var(--transition-normal);
}

.dock-item:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--content-text);
  transform: translateY(-2px) scale(1.1);
}

.dock-item.active {
  color: var(--dock-active);
}

.dock-item.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  width: 4px;
  height: 4px;
  background: var(--dock-active);
  border-radius: 50%;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .os-window {
    margin: 6px;
    border-radius: 8px;
  }

  .file-explorer {
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    z-index: 10;
    width: var(--sidebar-width);
    box-shadow: 4px 0 16px rgba(0, 0, 0, 0.3);
  }

  .file-explorer.collapsed {
    transform: translateX(-100%);
    width: var(--sidebar-width);
  }

  .window-body {
    position: relative;
  }

  .list-toolbar {
    grid-template-columns: 1fr;
  }

  .list-toolbar .toolbar-label:not(:first-child) {
    display: none;
  }

  .list-item {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .list-item-date,
  .list-item-size {
    padding-left: 24px;
  }

  .doc-content {
    padding: 20px 16px 32px;
  }

  .doc-header h1 {
    font-size: 22px;
  }

  .doc-meta {
    flex-wrap: wrap;
    gap: 8px;
  }

  .file-grid {
    grid-template-columns: 1fr;
  }

  .home-view {
    padding: 32px 16px;
  }

  .doc-nav {
    flex-direction: column;
  }

  .doc-nav-link {
    max-width: 100%;
  }

  .doc-nav-link.next {
    text-align: left;
  }
}

@media (max-width: 480px) {
  .menubar-item {
    display: none;
  }

  .dock-item {
    width: 36px;
    height: 36px;
  }
}