/* ═══════════════════════════════════════════════════════════════
   VAULT — styles.css
   Dark vault / terminal aesthetic. Refined and production-grade.
   All colours via CSS variables. Responsive at 768px / 480px.
═══════════════════════════════════════════════════════════════ */

/* ── Google Fonts fallback (loaded in HTML) ─────────────────── */
@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@300;400;500;600&family=Space+Grotesk:wght@300;400;500;600&display=swap');

/* ── Design tokens ──────────────────────────────────────────── */
:root {
  /* Backgrounds */
  --bg-base:    #080808;
  --bg-surface: #0d0d0d;
  --bg-raised:  #131313;
  --bg-overlay: #181818;

  /* Borders */
  --border-subtle:  rgba(255,255,255,0.055);
  --border-default: rgba(255,255,255,0.11);
  --border-strong:  rgba(255,255,255,0.2);

  /* Text */
  --text-primary:   #ececec;
  --text-secondary: #7a7a7a;
  --text-muted:     #444444;

  /* Accent */
  --accent:       #b8ff45;
  --accent-dim:   rgba(184,255,69,0.07);
  --accent-mid:   rgba(184,255,69,0.13);
  --accent-hover: rgba(184,255,69,0.2);
  --accent-glow:  rgba(184,255,69,0.12);

  /* Semantic */
  --color-danger: #ff4545;
  --color-warn:   #ffaa00;
  --color-info:   #4d8fff;

  /* Typography */
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --font-sans: 'Space Grotesk', 'Segoe UI', sans-serif;

  /* Radius */
  --radius-sm: 3px;
  --radius-md: 5px;

  /* Transitions */
  --t-fast: 0.1s ease;
  --t-base: 0.18s ease;
  --t-slow: 0.3s ease;
}

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

html, body {
  width: 100%; height: 100%;
  background: var(--bg-base);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.5;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Thin scrollbars */
* { scrollbar-width: thin; scrollbar-color: var(--border-default) transparent; }
::-webkit-scrollbar { width: 4px; height: 4px; }
::-webkit-scrollbar-thumb { background: var(--border-default); border-radius: 2px; }
::-webkit-scrollbar-track { background: transparent; }

button { font-family: inherit; cursor: pointer; border: none; }
input  { font-family: inherit; }
svg    { flex-shrink: 0; fill: none; }

/* ── Utility ────────────────────────────────────────────────── */
.hidden { display: none !important; }

/* ── Screen routing ─────────────────────────────────────────── */
.screen {
  position: absolute; inset: 0;
  display: flex;
  transition: opacity var(--t-slow), transform var(--t-slow);
}
.screen.hidden {
  opacity: 0;
  pointer-events: none;
  transform: scale(0.985);
}

/* ═══════════════════════════════════════════════════════════════
   LOGIN SCREEN
═══════════════════════════════════════════════════════════════ */
#screen-login {
  align-items: center;
  justify-content: center;
  background: var(--bg-base);
}

/* Background atmosphere */
.login-bg {
  position: absolute; inset: 0;
  overflow: hidden;
  pointer-events: none;
}
.login-bg::before {
  content: '';
  position: absolute;
  top: -20%;
  left: 50%;
  transform: translateX(-50%);
  width: 700px;
  height: 500px;
  background: radial-gradient(ellipse at center, rgba(184,255,69,0.04) 0%, transparent 65%);
}
.login-bg::after {
  content: '';
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.014) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.014) 1px, transparent 1px);
  background-size: 36px 36px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 0%, transparent 100%);
}
.grid-lines { display: none; } /* handled by ::after */

/* Login card */
.login-box {
  position: relative;
  width: 400px;
  max-width: calc(100vw - 32px);
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-top: 1px solid var(--border-strong);
  padding: 40px 36px 32px;
  border-radius: var(--radius-md);
  box-shadow:
    0 0 0 1px rgba(0,0,0,0.4),
    0 24px 64px rgba(0,0,0,0.6),
    0 0 40px rgba(184,255,69,0.03);
}

/* Logo */
.vault-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 28px;
}
.vault-icon {
  width: 28px; height: 28px;
  border: 1.5px solid var(--accent);
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--accent-dim);
}
.vault-icon svg {
  width: 13px; height: 13px;
  stroke: var(--accent);
  stroke-width: 1.6;
}
.vault-name {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--accent);
  font-weight: 500;
  text-transform: uppercase;
}

/* Login headings */
.login-title {
  font-size: 22px;
  font-weight: 500;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  margin-bottom: 5px;
}
.login-sub {
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--text-muted);
  margin-bottom: 26px;
  letter-spacing: 0.03em;
}

/* Steps */
.login-step { display: none; }
.login-step.active { display: block; }

.step-label {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.2em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 12px;
  opacity: 0.7;
}

/* Info box */
.info-box {
  background: var(--bg-raised);
  border: 1px solid var(--border-subtle);
  border-left: 2px solid rgba(184,255,69,0.4);
  padding: 11px 13px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-bottom: 18px;
}
.info-box p {
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* Security note */
.security-note {
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  margin-top: 18px;
  padding-top: 12px;
  border-top: 1px solid var(--border-subtle);
}

/* Status row */
.status-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
}
.status-dot {
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--color-warn);
  flex-shrink: 0;
  box-shadow: 0 0 6px currentColor;
}
.status-dot--ready { background: var(--accent); }
.status-dot--error { background: var(--color-danger); }
.status-text {
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--text-secondary);
}

/* Countdown */
.countdown-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-muted);
  margin-bottom: 12px;
}
.countdown-value { color: var(--accent); font-weight: 500; }
.countdown-value--expired { color: var(--color-danger); }

/* Token input */
.paste-field {
  width: 100%;
  background: var(--bg-raised);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--accent);
  letter-spacing: 0.1em;
  outline: none;
  margin-bottom: 10px;
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
  text-align: center;
}
.paste-field:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-dim);
}
.paste-field::placeholder {
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

/* Back link */
.btn-back {
  background: none;
  border: none;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 10.5px;
  padding: 0;
  margin-top: 12px;
  display: block;
  letter-spacing: 0.04em;
  transition: color var(--t-fast);
}
.btn-back:hover { color: var(--text-secondary); }

/* ═══════════════════════════════════════════════════════════════
   BUTTONS
═══════════════════════════════════════════════════════════════ */
.btn-primary {
  display: block;
  width: 100%;
  background: var(--accent);
  color: #060c00;
  border: none;
  padding: 12px 20px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  border-radius: var(--radius-sm);
  transition: opacity var(--t-fast), box-shadow var(--t-fast);
  position: relative;
  overflow: hidden;
}
.btn-primary::after {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.08) 0%, transparent 60%);
  pointer-events: none;
}
.btn-primary:hover:not(:disabled) {
  opacity: 0.9;
  box-shadow: 0 0 20px rgba(184,255,69,0.25);
}
.btn-primary:active:not(:disabled) { opacity: 0.75; }
.btn-primary:disabled { opacity: 0.25; cursor: not-allowed; }
.btn-primary--flex { display: inline-flex; width: auto; flex: 2; align-items: center; justify-content: center; }

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-default);
  padding: 10px 20px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  border-radius: var(--radius-sm);
  flex: 1;
  transition: border-color var(--t-fast), color var(--t-fast);
}
.btn-ghost:hover { border-color: var(--border-strong); color: var(--text-primary); }

/* ═══════════════════════════════════════════════════════════════
   VAULT SCREEN LAYOUT
═══════════════════════════════════════════════════════════════ */
#screen-vault { flex-direction: column; }

/* ── Topbar ─────────────────────────────────────────────────── */
.topbar {
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 10px 0 0;
  border-bottom: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  flex-shrink: 0;
  z-index: 10;
}
.topbar-left { display: flex; align-items: center; height: 100%; }

.topbar-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 14px;
  height: 100%;
  border-right: 1px solid var(--border-subtle);
  user-select: none;
  cursor: default;
}
.tl-icon {
  width: 19px; height: 19px;
  border: 1px solid rgba(184,255,69,0.5);
  display: flex; align-items: center; justify-content: center;
  border-radius: 2px;
  background: var(--accent-dim);
}
.tl-icon svg { width: 10px; height: 10px; stroke: var(--accent); stroke-width: 1.8; }
.topbar-logo > span {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  color: var(--accent);
  font-weight: 500;
  text-transform: uppercase;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 0 14px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--text-muted);
}
.crumb {
  cursor: pointer;
  transition: color var(--t-fast);
  padding: 2px 3px;
  border-radius: 2px;
}
.crumb:hover:not(.active) { color: var(--text-primary); }
.crumb.active { color: var(--text-secondary); cursor: default; }
.crumb-sep { color: var(--text-muted); opacity: 0.4; margin: 0 1px; }

.topbar-right { display: flex; align-items: center; gap: 4px; }

.session-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  background: var(--accent-dim);
  border: 1px solid rgba(184,255,69,0.12);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 8.5px;
  color: var(--accent);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  opacity: 0.85;
}
.session-dot {
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 5px var(--accent);
  animation: pulse-dot 2.5s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.4; }
}

.tb-divider { width: 1px; height: 18px; background: var(--border-subtle); margin: 0 2px; }

.tb-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  background: none;
  border: 1px solid transparent;
  color: var(--text-secondary);
  padding: 4px 9px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.06em;
  transition: border-color var(--t-fast), color var(--t-fast), background var(--t-fast);
}
.tb-btn:hover { border-color: var(--border-default); color: var(--text-primary); background: var(--bg-raised); }
.tb-btn svg { width: 12px; height: 12px; stroke: currentColor; stroke-width: 1.6; }
.tb-btn--danger:hover { border-color: rgba(255,69,69,0.3); color: var(--color-danger); background: rgba(255,69,69,0.04); }

/* ── Vault body ─────────────────────────────────────────────── */
.vault-body {
  display: flex;
  flex: 1;
  overflow: hidden;
  min-height: 0;
}

/* ── Sidebar ────────────────────────────────────────────────── */
.sidebar {
  width: 200px;
  flex-shrink: 0;
  border-right: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.sidebar-section-label {
  font-family: var(--font-mono);
  font-size: 8.5px;
  letter-spacing: 0.2em;
  color: var(--text-muted);
  text-transform: uppercase;
  padding: 11px 13px 5px;
  flex-shrink: 0;
}
.folder-tree {
  flex: 1;
  overflow-y: auto;
  padding-bottom: 6px;
}

.tree-item {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 5px 13px;
  cursor: pointer;
  font-size: 12px;
  color: var(--text-secondary);
  transition: background var(--t-fast), color var(--t-fast);
  user-select: none;
  position: relative;
  white-space: nowrap;
}
.tree-item:hover { background: var(--bg-raised); color: var(--text-primary); }
.tree-item.active {
  background: var(--accent-dim);
  color: var(--accent);
}
.tree-item.active::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 2px;
  background: var(--accent);
  border-radius: 0 1px 1px 0;
}
.tree-item svg { width: 13px; height: 13px; stroke: currentColor; stroke-width: 1.4; flex-shrink: 0; }
.tree-item--indent1 { padding-left: 26px; }
.tree-item--indent2 { padding-left: 40px; }
.tree-item .tree-count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 8.5px;
  color: var(--text-muted);
  background: var(--bg-overlay);
  padding: 1px 5px;
  border-radius: 2px;
  flex-shrink: 0;
  letter-spacing: 0.02em;
}

.sidebar-footer {
  padding: 10px 13px;
  border-top: 1px solid var(--border-subtle);
  flex-shrink: 0;
}
.storage-label {
  font-family: var(--font-mono);
  font-size: 8.5px;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  margin-bottom: 5px;
}
.storage-bar {
  width: 100%;
  height: 2px;
  background: var(--bg-overlay);
  border-radius: 1px;
}
.storage-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 1px;
  width: 0%;
  transition: width var(--t-slow);
}

/* ── Main panel ─────────────────────────────────────────────── */
.main-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}

/* Action bar */
.action-bar {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 7px 12px;
  border-bottom: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  flex-shrink: 0;
  flex-wrap: wrap;
}
.action-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  background: var(--bg-raised);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 5px 9px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  transition: border-color var(--t-fast), color var(--t-fast), background var(--t-fast);
  white-space: nowrap;
}
.action-btn:hover { border-color: var(--border-default); color: var(--text-primary); background: var(--bg-overlay); }
.action-btn svg { width: 11px; height: 11px; stroke: currentColor; stroke-width: 1.6; }
.action-btn--accent {
  background: var(--accent-dim);
  border-color: rgba(184,255,69,0.18);
  color: var(--accent);
}
.action-btn--accent:hover {
  background: var(--accent-mid);
  border-color: rgba(184,255,69,0.35);
  color: var(--accent);
}

.search-wrap {
  position: relative;
  margin-left: auto;
}
.search-wrap > svg {
  position: absolute;
  left: 8px; top: 50%;
  transform: translateY(-50%);
  width: 11px; height: 11px;
  stroke: var(--text-muted);
  stroke-width: 1.6;
  pointer-events: none;
}
.search-input {
  background: var(--bg-raised);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  padding: 5px 10px 5px 26px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 10.5px;
  outline: none;
  width: 170px;
  transition: border-color var(--t-fast), width var(--t-base), box-shadow var(--t-fast);
  -webkit-appearance: none;
}
.search-input:focus {
  border-color: rgba(184,255,69,0.3);
  width: 220px;
  box-shadow: 0 0 0 2px var(--accent-dim);
}
.search-input::placeholder { color: var(--text-muted); }

/* File area */
.file-area {
  flex: 1;
  overflow-y: auto;
  padding: 14px;
  min-height: 0;
}
.file-section { margin-bottom: 22px; }
.file-section.hidden { display: none; }

.section-header {
  font-family: var(--font-mono);
  font-size: 8.5px;
  letter-spacing: 0.2em;
  color: var(--text-muted);
  text-transform: uppercase;
  padding-bottom: 8px;
}
.file-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 7px;
}

/* File cards */
.file-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 12px 11px 10px;
  cursor: pointer;
  transition: border-color var(--t-fast), background var(--t-fast), transform var(--t-fast);
  position: relative;
  overflow: hidden;
  user-select: none;
  min-width: 0;
}
.file-card:hover {
  border-color: var(--border-default);
  background: var(--bg-raised);
  transform: translateY(-1px);
}
.file-card.selected {
  border-color: rgba(184,255,69,0.35);
  background: var(--accent-dim);
}
.file-card:active { transform: translateY(0); }

.fc-icon {
  width: 28px; height: 28px;
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 9px;
}
.fc-icon--folder { background: rgba(255,170,0,0.07); }
.fc-icon--note   { background: rgba(77,143,255,0.07); }
.fc-icon--code   { background: rgba(184,255,69,0.07); }
.fc-icon--image  { background: rgba(255,69,69,0.07); }
.fc-icon--file   { background: rgba(120,120,120,0.07); }
.fc-icon svg { width: 15px; height: 15px; stroke-width: 1.3; }
.fc-icon--folder svg { stroke: var(--color-warn); }
.fc-icon--note   svg { stroke: var(--color-info); }
.fc-icon--code   svg { stroke: var(--accent); }
.fc-icon--image  svg { stroke: var(--color-danger); }
.fc-icon--file   svg { stroke: var(--text-secondary); }

.fc-name {
  font-size: 11.5px;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 3px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.fc-meta {
  font-family: var(--font-mono);
  font-size: 8.5px;
  color: var(--text-muted);
  letter-spacing: 0.03em;
}
.fc-badge {
  position: absolute;
  top: 6px; right: 6px;
  font-family: var(--font-mono);
  font-size: 7.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 2px 4px;
  border-radius: 2px;
  background: var(--bg-overlay);
  color: var(--text-muted);
  border: 1px solid var(--border-subtle);
}

/* Empty state */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 70px 20px;
  text-align: center;
}
.empty-state svg { width: 30px; height: 30px; stroke: var(--text-muted); stroke-width: 1; }
.empty-state p { font-family: var(--font-mono); font-size: 11px; color: var(--text-muted); }
.empty-sub { font-size: 9.5px !important; opacity: 0.6; }

/* ── Detail panel ───────────────────────────────────────────── */
.detail-panel {
  width: 240px;
  flex-shrink: 0;
  border-left: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.detail-empty {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 20px;
  text-align: center;
}
.detail-empty svg { width: 28px; height: 28px; stroke: var(--text-muted); stroke-width: 1; }
.detail-empty p { font-family: var(--font-mono); font-size: 9.5px; color: var(--text-muted); }

#detail-content { display: flex; flex-direction: column; height: 100%; overflow: hidden; }
#detail-content.hidden { display: none; }

.detail-header {
  padding: 12px 13px;
  border-bottom: 1px solid var(--border-subtle);
  flex-shrink: 0;
}
.detail-name {
  font-size: 11.5px;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 3px;
  word-break: break-all;
  line-height: 1.4;
}
.detail-type {
  font-family: var(--font-mono);
  font-size: 8.5px;
  color: var(--text-muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.detail-preview {
  margin: 11px;
  background: var(--bg-raised);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  min-height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  overflow: hidden;
}
.detail-preview--code,
.detail-preview--note {
  background: none;
  border: none;
  margin: 0;
  min-height: unset;
  display: block;
  overflow: auto;
}
.detail-preview > svg { width: 32px; height: 32px; stroke: var(--text-muted); stroke-width: 1; }

.detail-meta { padding: 0 13px; overflow-y: auto; flex: 1; }
.meta-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: 6px 0;
  border-bottom: 1px solid var(--border-subtle);
}
.meta-row:last-child { border-bottom: none; }
.meta-key {
  font-family: var(--font-mono);
  font-size: 9.5px;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  flex-shrink: 0;
}
.meta-val {
  font-family: var(--font-mono);
  font-size: 9.5px;
  color: var(--text-secondary);
  text-align: right;
  max-width: 60%;
  word-break: break-all;
  line-height: 1.4;
}

.detail-actions {
  padding: 9px 13px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex-shrink: 0;
}
.detail-action-btn {
  width: 100%;
  background: var(--bg-raised);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 6px 9px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: border-color var(--t-fast), color var(--t-fast), background var(--t-fast);
}
.detail-action-btn:hover { border-color: var(--border-default); color: var(--text-primary); }
.detail-action-btn--danger:hover {
  border-color: rgba(255,69,69,0.3);
  color: var(--color-danger);
  background: rgba(255,69,69,0.04);
}
.detail-action-btn svg { width: 10px; height: 10px; stroke: currentColor; stroke-width: 1.6; }

/* Code / note viewers */
.code-viewer {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--accent);
  line-height: 1.75;
  white-space: pre;
  overflow: auto;
  padding: 11px 13px;
  max-height: 200px;
}
.note-viewer {
  font-size: 11.5px;
  color: var(--text-secondary);
  line-height: 1.8;
  padding: 11px 13px;
  overflow-y: auto;
  max-height: 200px;
  white-space: pre-wrap;
  word-break: break-word;
}

/* ═══════════════════════════════════════════════════════════════
   CONTEXT MENU
═══════════════════════════════════════════════════════════════ */
.context-menu {
  position: fixed;
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: 4px 0;
  min-width: 158px;
  z-index: 500;
  box-shadow:
    0 0 0 1px rgba(0,0,0,0.3),
    0 8px 28px rgba(0,0,0,0.6);
}
.ctx-item {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 6px 11px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--text-secondary);
  background: none;
  border: none;
  cursor: pointer;
  transition: background var(--t-fast), color var(--t-fast);
  text-align: left;
  letter-spacing: 0.02em;
}
.ctx-item:hover { background: var(--bg-raised); color: var(--text-primary); }
.ctx-item--danger:hover { color: var(--color-danger); background: rgba(255,69,69,0.04); }
.ctx-item svg { width: 11px; height: 11px; stroke: currentColor; stroke-width: 1.5; }
.ctx-separator { height: 1px; background: var(--border-subtle); margin: 3px 0; }

/* ═══════════════════════════════════════════════════════════════
   MODAL
═══════════════════════════════════════════════════════════════ */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.72);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 400;
  transition: opacity var(--t-base);
  backdrop-filter: blur(2px);
}
.modal-overlay[aria-hidden="true"]  { opacity: 0; pointer-events: none; }
.modal-overlay[aria-hidden="false"] { opacity: 1; pointer-events: all; }

.modal {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-top: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  padding: 24px 24px 20px;
  width: 330px;
  max-width: calc(100vw - 32px);
  box-shadow: 0 24px 60px rgba(0,0,0,0.7);
}
.modal-title {
  font-size: 14.5px;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 4px;
  letter-spacing: -0.01em;
}
.modal-sub {
  font-family: var(--font-mono);
  font-size: 9.5px;
  color: var(--text-muted);
  margin-bottom: 16px;
  letter-spacing: 0.03em;
}
.modal-input {
  width: 100%;
  background: var(--bg-raised);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  padding: 9px 11px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--text-primary);
  outline: none;
  margin-bottom: 14px;
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}
.modal-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-dim);
}
.modal-actions { display: flex; gap: 7px; }

/* ═══════════════════════════════════════════════════════════════
   TOAST
═══════════════════════════════════════════════════════════════ */
.toast {
  position: fixed;
  bottom: 16px; right: 16px;
  background: var(--bg-raised);
  border: 1px solid var(--border-default);
  border-left: 2px solid var(--accent);
  padding: 8px 13px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--text-secondary);
  z-index: 600;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity var(--t-base), transform var(--t-base);
  pointer-events: none;
  max-width: 300px;
  letter-spacing: 0.02em;
}
.toast.toast--visible { opacity: 1; transform: translateY(0); }
.toast.toast--error { border-left-color: var(--color-danger); }

/* ═══════════════════════════════════════════════════════════════
   RESPONSIVE
═══════════════════════════════════════════════════════════════ */
@media (max-width: 900px) {
  .detail-panel { display: none; }
}
@media (max-width: 640px) {
  .sidebar { width: 42px; }
  .sidebar-section-label,
  .tree-item > span:not(.tree-count),
  .storage-label { display: none; }
  .tree-item { padding: 7px; justify-content: center; }
  .tree-item .tree-count { display: none; }
  .tree-item--indent1,
  .tree-item--indent2 { padding-left: 7px; }
  .action-btn > span { display: none; }
  .action-btn { padding: 5px 7px; }
  .session-badge > span:last-child { display: none; }
  .topbar-logo > span { display: none; }
}
/* ═══════════════════════════════════════════════
   VAULT LAYOUT — three-panel + notepad
   Add these rules to the bottom of styles.css
════════════════════════════════════════════════ */

/* Action bar sits above the panels */
.action-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  flex-shrink: 0;
}

/* Vault body = flex row, fills remaining height */
.vault-body {
  display: flex;
  flex: 1;
  overflow: hidden;
  height: 0; /* forces flex children to fill */
}

/* ── Panels ────────────────────────────────── */
.list-panel {
  display: flex;
  flex-direction: column;
  width: 28%;
  min-width: 160px;
  overflow: hidden;
  border-right: none; /* divider handles separation */
  background: var(--surface);
}

.notepad-panel {
  display: flex;
  flex-direction: column;
  min-width: 160px;
  background: var(--bg);
  overflow: hidden;
}

.detail-panel {
  display: flex;
  flex-direction: column;
  min-width: 160px;
  overflow-y: auto;
  padding: 16px;
  background: var(--surface);
}

/* ── Draggable dividers ─────────────────────── */
.divider {
  width: 5px;
  background: var(--border);
  cursor: col-resize;
  flex-shrink: 0;
  transition: background 0.15s;
  display: flex;
  align-items: center;
  justify-content: center;
}
.divider:hover,
.divider:active {
  background: var(--accent);
}
/* Subtle grip dots */
.divider::after {
  content: '⋮';
  color: var(--text-muted);
  font-size: 14px;
  opacity: 0.4;
  pointer-events: none;
}

/* ── File list ──────────────────────────────── */
.file-list {
  flex: 1;
  overflow-y: auto;
  padding: 6px 0;
}

.file-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  cursor: pointer;
  border-left: 2px solid transparent;
  transition: background 0.1s, border-color 0.1s;
  user-select: none;
}
.file-row:hover   { background: var(--surface-2); }
.file-row.selected {
  background: var(--accent-dim);
  border-left-color: var(--accent);
}
.file-row.open {
  border-left-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 8%, transparent);
}
.file-row.dragging  { opacity: 0.4; }
.file-row.drag-over { background: var(--accent-dim); }

/* Thumbnail */
.fr-thumb {
  width: 36px;
  height: 36px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  background: var(--surface-2);
}
.fr-thumb svg { width: 18px; height: 18px; stroke: var(--text-muted); fill: none; stroke-width: 1.2; }
.fr-thumb--image { background: none; overflow: hidden; }
.fr-thumb--note  { background: color-mix(in srgb, #5b8df0 15%, transparent); }
.fr-thumb--note svg  { stroke: #5b8df0; }
.fr-thumb--code  { background: color-mix(in srgb, #a78bfa 15%, transparent); }
.fr-thumb--code svg  { stroke: #a78bfa; }
.fr-thumb--image svg { stroke: #f0955b; }

.fr-info  { flex: 1; overflow: hidden; }
.fr-name  { font-size: 12px; font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; color: var(--text); }
.fr-meta  { font-size: 10px; color: var(--text-muted); margin-top: 2px; }
.fr-type  { font-size: 9px; text-transform: uppercase; color: var(--text-muted); letter-spacing: 0.5px; flex-shrink: 0; }

/* Storage footer inside list panel */
.list-panel .sidebar-footer {
  padding: 10px 12px;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

/* ── Notepad ────────────────────────────────── */
.notepad-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  background: var(--surface);
}
.notepad-title {
  font-size: 12px;
  font-weight: 500;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.notepad-close {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 14px;
  padding: 2px 6px;
  border-radius: 3px;
  flex-shrink: 0;
}
.notepad-close:hover { background: var(--surface-2); color: var(--text); }

.notepad-area {
  flex: 1;
  width: 100%;
  border: none;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  padding: 16px 18px;
  resize: none;
  outline: none;
  box-sizing: border-box;
}

/* Screen layout — vault screen uses flex column */
#screen-vault {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

/* vault-body fills remaining space */
#screen-vault .vault-body {
  flex: 1;
  min-height: 0;
}