:root {
  --bg: #0f1115;
  --bg-2: #161a22;
  --bg-3: #1d232e;
  --border: #2a3342;
  --text: #e6e9ef;
  --muted: #9aa4b2;
  --accent: #4f8cff;
  --accent-2: #6ea8ff;
  --danger: #ff5c5c;
  --ok: #3ecf8e;
  --warn: #ffb84d;
  --radius: 12px;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

/* light theme overrides */
body.theme-light {
  --bg: #f4f6fa;
  --bg-2: #ffffff;
  --bg-3: #eef1f6;
  --border: #d8dde6;
  --text: #1a1d24;
  --muted: #6b7280;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}
body.theme-light {
  background: radial-gradient(1200px 600px at 20% -10%, #ffffff 0%, var(--bg) 55%);
}
body.theme-light .topbar {
  background: rgba(255, 255, 255, 0.9);
  border-color: var(--border);
}
body.theme-light .qr-box {
  background: #fff;
  border: 1px solid var(--border);
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: radial-gradient(1200px 600px at 20% -10%, #1a2332 0%, var(--bg) 55%);
  color: var(--text);
  min-height: 100vh;
}

.hidden { display: none !important; }

/* ---------- buttons ---------- */
.btn {
  border: 1px solid var(--border);
  background: var(--bg-3);
  color: var(--text);
  border-radius: 8px;
  padding: 9px 16px;
  font-size: 14px;
  cursor: pointer;
  transition: filter .15s, transform .05s;
  white-space: nowrap;
}
.btn:hover { filter: brightness(1.12); }
.btn:active { transform: translateY(1px); }
.btn.primary { background: linear-gradient(135deg, var(--accent), var(--accent-2)); border: none; color: #fff; }
.btn.ghost { background: transparent; }
.btn.danger { background: rgba(255, 92, 92, .12); border-color: rgba(255, 92, 92, .4); color: var(--danger); }
.btn.small { padding: 6px 12px; font-size: 13px; }
.btn.block { width: 100%; }
.icon-btn {
  background: transparent; border: none; color: var(--muted); font-size: 16px;
  cursor: pointer; border-radius: 6px; padding: 4px 7px;
}
.icon-btn:hover { background: var(--bg-3); color: var(--text); }

/* ---------- login ---------- */
.view { padding: 24px; max-width: 1280px; margin: 0 auto; }
#view-login { display: flex; align-items: center; justify-content: center; min-height: 100vh; }
.login-card {
  width: 360px; background: var(--bg-2); border: 1px solid var(--border);
  border-radius: 16px; padding: 32px; box-shadow: var(--shadow);
}
.brand { text-align: center; margin-bottom: 20px; }
.brand-logo { font-size: 42px; }
.brand h1 { margin: 6px 0 4px; font-size: 22px; }
.sub { color: var(--muted); font-size: 13px; margin: 0; }
.login-card label { font-size: 13px; color: var(--muted); display: block; margin-bottom: 6px; }
input[type="text"], input[type="password"] {
  width: 100%; padding: 10px 12px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--bg); color: var(--text); margin-bottom: 12px; font-size: 14px;
}
input:focus { outline: none; border-color: var(--accent); }
.error-msg { color: var(--danger); font-size: 13px; min-height: 18px; margin: 0 0 8px; }
.foot-note { text-align: center; color: var(--muted); font-size: 12px; margin-top: 14px; }

/* ---------- topbar ---------- */
.topbar {
  display: flex; align-items: center; gap: 20px;
  background: rgba(22, 26, 34, .9); border: 1px solid var(--border);
  border-radius: 14px; padding: 12px 18px; backdrop-filter: blur(8px);
}
.brand-mini { display: flex; align-items: center; gap: 8px; font-weight: 600; }
.brand-logo.small { font-size: 20px; }
.tabs { display: flex; gap: 4px; margin-left: 12px; }
.tab {
  background: transparent; border: none; color: var(--muted); font-size: 14px;
  padding: 8px 16px; border-radius: 8px; cursor: pointer;
}
.tab.active { background: var(--bg-3); color: var(--text); }
.top-actions { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.badge {
  font-size: 12px; padding: 4px 10px; border-radius: 20px;
  background: rgba(62, 207, 142, .15); color: var(--ok); border: 1px solid rgba(62, 207, 142, .3);
}
.badge.warn { background: rgba(255, 184, 77, .12); color: var(--warn); border-color: rgba(255, 184, 77, .3); }

/* ---------- panels ---------- */
.tab-panel { margin-top: 18px; }
.panel-head { display: flex; align-items: baseline; gap: 12px; margin-bottom: 14px; }
.panel-head h2 { margin: 0; font-size: 18px; }
.hint { color: var(--muted); font-size: 13px; }

/* ---------- files layout ---------- */
.files-layout { display: grid; grid-template-columns: 300px 1fr; gap: 18px; }
.sidebar {
  background: var(--bg-2); border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; max-height: calc(100vh - 160px); display: flex; flex-direction: column;
}
.sidebar-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 14px; border-bottom: 1px solid var(--border); font-weight: 600;
}
.tree { padding: 8px; overflow: auto; flex: 1; }
.content {
  background: var(--bg-2); border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; display: flex; flex-direction: column; min-height: 400px;
}
.crumb-bar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 16px; border-bottom: 1px solid var(--border); gap: 10px; flex-wrap: wrap;
}
.breadcrumb { font-size: 14px; display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.breadcrumb .crumb { cursor: pointer; color: var(--accent-2); }
.breadcrumb .crumb.sep { color: var(--muted); cursor: default; padding: 0; }
.breadcrumb .crumb.current { color: var(--text); cursor: default; font-weight: 600; }
.content-actions { display: flex; gap: 8px; }

/* ---------- file table ---------- */
.file-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.file-table th, .file-table td { text-align: left; padding: 10px 16px; border-bottom: 1px solid var(--border); }
.file-table th { color: var(--muted); font-weight: 500; font-size: 12px; text-transform: uppercase; letter-spacing: .5px; }
.file-table tbody tr:hover { background: var(--bg-3); }
.file-table td.right { text-align: right; }
.file-table th.right { text-align: right; }
.row-actions { display: flex; gap: 6px; justify-content: flex-end; }
.row-actions .link { color: var(--accent-2); cursor: pointer; background: none; border: none; font-size: 13px; }
.row-actions .link.danger { color: var(--danger); }
.name-cell { display: flex; align-items: center; gap: 8px; cursor: pointer; }
.name-cell .icon { font-size: 18px; }
.empty-hint { text-align: center; color: var(--muted); padding: 40px 0; }
.muted { color: var(--muted); font-size: 13px; }

/* ---------- cards ---------- */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); gap: 18px; }
.card {
  background: var(--bg-2); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px; 
}
.card h3 { margin: 0 0 6px; font-size: 16px; }
.card hr { border: none; border-top: 1px solid var(--border); margin: 20px 0; }
.vform label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 6px; }
.vform input { margin-bottom: 10px; }
.msg-line { min-height: 18px; font-size: 13px; margin: 4px 0 10px; color: var(--muted); }
.msg-line.ok { color: var(--ok); }
.msg-line.err { color: var(--danger); }
.compliance { font-size: 13px; line-height: 1.7; background: var(--bg); border: 1px solid var(--border); border-radius: 8px; padding: 12px; margin-bottom: 12px; white-space: pre-wrap; font-family: ui-monospace, monospace; }

/* ---------- tree ---------- */
.tree-item { display: flex; align-items: center; gap: 6px; padding: 5px 8px; border-radius: 6px; cursor: pointer; font-size: 13px; color: var(--muted); }
.tree-item:hover { background: var(--bg-3); color: var(--text); }
.tree-item.active { background: rgba(79, 140, 255, .15); color: var(--text); }
.tree-item .twist { width: 14px; display: inline-block; color: var(--muted); }
.tree-item .ti { font-size: 15px; }
.tree-item .tname { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.tree-children { margin-left: 14px; border-left: 1px solid var(--border); padding-left: 4px; }

/* ---------- modal ---------- */
.modal {
  position: fixed; inset: 0; background: rgba(0, 0, 0, .55);
  display: flex; align-items: center; justify-content: center; z-index: 50; padding: 20px;
}
.modal-card {
  background: var(--bg-2); border: 1px solid var(--border); border-radius: 14px;
  padding: 22px; width: 420px; max-width: 100%; box-shadow: var(--shadow);
}
.modal-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; }
.modal-head h3 { margin: 0; }
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 18px; }
.qr-box { display: flex; justify-content: center; margin: 14px 0; background: #fff; border-radius: 10px; padding: 10px; }
.qr-box img { width: 220px; height: 220px; image-rendering: pixelated; }
.row { margin-top: 10px; }
.qr-actions { margin-top: 8px; display: flex; justify-content: center; }
#share-url { width: 100%; margin-bottom: 4px; }

/* ---------- toast ---------- */
.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  background: var(--bg-3); border: 1px solid var(--border); color: var(--text);
  padding: 11px 22px; border-radius: 10px; font-size: 14px; box-shadow: var(--shadow); z-index: 99;
}
.toast.danger { border-color: rgba(255, 92, 92, .5); color: var(--danger); }

/* ---------- theme toggle ---------- */
.theme-btn {
  font-family: ui-monospace, monospace;
  font-size: 12px;
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--bg-3);
  color: var(--text);
  cursor: pointer;
  transition: filter .15s;
}
.theme-btn:hover { filter: brightness(1.15); }

@media (max-width: 860px) {
  .files-layout { grid-template-columns: 1fr; }
  .sidebar { max-height: 260px; }
}