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

:root {
  --black:       #000000;
  --near-black:  #212121;
  --deep-dark:   #17171c;
  --blue:        #1863dc;
  --white:       #ffffff;
  --snow:        #fafafa;
  --gray-light:  #f2f2f2;
  --gray-mid:    #d9d9dd;
  --gray-border: #e5e7eb;
  --slate:       #93939f;
  --r22:         22px;
  --r4:          4px;
  --pill:        9999px;
  --f-display:   'Space Grotesk', 'Inter', ui-sans-serif, system-ui, sans-serif;
  --f-body:      'Inter', ui-sans-serif, system-ui, sans-serif;
  --f-mono:      'JetBrains Mono', ui-monospace, 'Courier New', monospace;
}

html { height: 100%; }

body {
  font-family: var(--f-body);
  background: var(--white);
  color: var(--near-black);
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ─── HEADER ─── */
header {
  flex-shrink: 0;
  height: 60px;
  background: var(--white);
  border-bottom: 1px solid var(--gray-border);
  padding: 0 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: 10;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.brand-mark {
  width: 30px;
  height: 30px;
  background: var(--black);
  border-radius: 7px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.brand-name {
  font-family: var(--f-display);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: -0.3px;
  color: var(--black);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.live-dot {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--f-mono);
  font-size: 10px;
  color: var(--slate);
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

.live-dot::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #22c55e;
  animation: pulse 2.4s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.5; transform: scale(0.8); }
}

.file-count-tag {
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--slate);
  background: var(--gray-light);
  border-radius: var(--pill);
  padding: 3px 10px;
  letter-spacing: 0.2px;
}

/* ─── MAIN ─── */
main {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: thin;
  scrollbar-color: var(--gray-mid) transparent;
}

main::-webkit-scrollbar       { width: 6px; }
main::-webkit-scrollbar-track { background: transparent; }
main::-webkit-scrollbar-thumb { background: var(--gray-mid); border-radius: 3px; }

.center-wrap {
  min-height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 48px 24px;
}

/* ─── TREE CARD ─── */
.tree-card {
  width: 100%;
  max-width: 860px;
  border: 1px solid var(--gray-border);
  border-radius: var(--r22);
  overflow: hidden;
  background: var(--white);
}

.tree-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  border-bottom: 1px solid var(--gray-light);
  background: var(--snow);
}

.tree-card-label {
  font-family: var(--f-mono);
  font-size: 10px;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  color: var(--slate);
}

.tree-card-title {
  font-family: var(--f-display);
  font-size: 14px;
  font-weight: 500;
  color: var(--near-black);
  letter-spacing: -0.1px;
  margin-top: 2px;
}

.tree-card-meta {
  display: flex;
  align-items: center;
  gap: 8px;
}

.badge {
  font-family: var(--f-mono);
  font-size: 10px;
  color: var(--slate);
  background: var(--gray-light);
  border-radius: var(--pill);
  padding: 2px 9px;
}

.tree-body {
  padding: 10px 0;
}

/* ─── DIRECTORY ─── */
.tree-dir { }

.dir-toggle {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 7px 24px;
  width: 100%;
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--f-body);
  font-size: 13.5px;
  color: var(--near-black);
  transition: background 0.1s;
  text-align: left;
}

.dir-toggle:hover { background: var(--snow); }

.dir-toggle:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: -2px;
}

.chevron {
  width: 10px;
  height: 10px;
  color: var(--gray-mid);
  transition: transform 0.15s ease;
  flex-shrink: 0;
}

.dir-toggle[aria-expanded="false"] .chevron {
  transform: rotate(-90deg);
}

.folder-icon {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
}

.dir-name {
  font-weight: 500;
  flex: 1;
  font-size: 13.5px;
}

.count-badge {
  font-family: var(--f-mono);
  font-size: 10px;
  color: var(--slate);
  background: var(--gray-light);
  border-radius: var(--pill);
  padding: 1px 7px;
}

.tree-children {
  padding-left: 24px;
  border-left: 1px solid var(--gray-light);
  margin-left: 30px;
  overflow: hidden;
}

.tree-children.collapsed { display: none; }

/* ─── FILE ROW ─── */
.tree-file {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 24px;
  transition: background 0.1s;
}

.tree-file:hover {
  background: var(--snow);
}

.tree-file:hover .copy-btn {
  opacity: 1;
}

.ext-badge {
  font-family: var(--f-mono);
  font-size: 9px;
  letter-spacing: 0.2px;
  text-transform: uppercase;
  color: var(--slate);
  background: var(--gray-light);
  border-radius: var(--r4);
  padding: 2px 5px;
  min-width: 38px;
  text-align: center;
  flex-shrink: 0;
}

.file-link {
  font-size: 13.5px;
  color: var(--near-black);
  text-decoration: none;
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: color 0.1s;
}

.file-link:hover { color: var(--blue); }

.file-link:focus-visible {
  outline: 2px solid var(--blue);
  border-radius: 2px;
}

.file-size {
  font-family: var(--f-mono);
  font-size: 10.5px;
  color: var(--slate);
  flex-shrink: 0;
  min-width: 52px;
  text-align: right;
}

/* ─── COPY BUTTON ─── */
.copy-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: none;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  color: var(--slate);
  opacity: 0;
  transition: opacity 0.12s, color 0.12s, background 0.12s;
  flex-shrink: 0;
  position: relative;
}

.copy-btn:hover {
  color: var(--near-black);
  background: var(--gray-light);
}

.copy-btn:focus-visible {
  outline: 2px solid var(--blue);
  opacity: 1;
}

.icon {
  width: 14px;
  height: 14px;
  position: absolute;
  transition: opacity 0.15s;
}

.icon-check { opacity: 0; }

.copy-btn.copied .icon-copy  { opacity: 0; }
.copy-btn.copied .icon-check { opacity: 1; }

/* ─── EMPTY STATE ─── */
.empty-state {
  padding: 48px 24px;
  text-align: center;
}

.empty-state p {
  font-size: 14px;
  color: var(--slate);
}

.empty-state code {
  font-family: var(--f-mono);
  font-size: 13px;
  background: var(--gray-light);
  padding: 1px 5px;
  border-radius: 3px;
}

/* ─── 404 ERROR ─── */
.error-card {
  text-align: center;
  max-width: 420px;
  padding: 0 24px;
}

.error-code {
  font-family: var(--f-display);
  font-size: 96px;
  font-weight: 500;
  letter-spacing: -4px;
  color: var(--gray-border);
  line-height: 1;
}

.error-title {
  font-family: var(--f-display);
  font-size: 20px;
  font-weight: 500;
  color: var(--near-black);
  margin-top: 16px;
}

.error-desc {
  font-size: 14px;
  color: var(--slate);
  margin-top: 8px;
  line-height: 1.6;
}

.error-link {
  display: inline-block;
  margin-top: 24px;
  font-family: var(--f-mono);
  font-size: 12px;
  color: var(--blue);
  text-decoration: none;
  padding: 8px 20px;
  border: 1px solid var(--gray-border);
  border-radius: 9999px;
  transition: background 0.15s, border-color 0.15s;
}

.error-link:hover {
  background: var(--snow);
  border-color: var(--blue);
}

/* ─── FOOTER ─── */
footer {
  flex-shrink: 0;
  background: linear-gradient(175deg, #12121e 0%, #0e0e1a 60%, #080810 100%);
  border-top: 1px solid rgba(255,255,255,0.05);
  padding: 18px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-copy {
  font-size: 12px;
  color: rgba(255,255,255,0.38);
  letter-spacing: 0.1px;
}

.footer-copy strong {
  color: rgba(255,255,255,0.6);
  font-weight: 400;
}

.footer-copy a {
  color: rgba(255,255,255,0.6);
  text-decoration: none;
  transition: color 0.15s, border-color 0.15s;
}

.footer-copy a:hover {
  color: rgba(255,255,255,0.9);
  border-color: rgba(255,255,255,0.5);
}

.footer-built {
  font-family: var(--f-mono);
  font-size: 9.5px;
  color: rgba(255,255,255,0.2);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ─── RESPONSIVE ─── */
@media (max-width: 640px) {
  header { padding: 0 16px; }
  .live-dot span { display: none; }

  .center-wrap { padding: 24px 12px; }
  .tree-card-header { padding: 16px 16px; }
  .tree-body { padding: 6px 0; }

  .dir-toggle { padding: 7px 16px; }
  .tree-file  { padding: 6px 16px; }

  .tree-children { margin-left: 20px; padding-left: 16px; }

  .file-size { display: none; }

  .error-code { font-size: 72px; }

  footer { padding: 16px; flex-direction: column; gap: 6px; text-align: center; }
}