/* ── Variables ─────────────────────────────────────────────── */
:root {
  --bg: #f3f6f9;
  --card: #ffffff;
  --border: #d0d7de;
  --border-light: #e8ecf0;
  --accent: #1a7f64;
  --accent-light: #e6f4ef;
  --accent-bg: #f0faf6;
  --text: #1f2328;
  --text-muted: #656d76;
  --text-faint: #8b949e;
  --danger: #cf222e;
  --warning: #bf8700;
  --shadow: 0 1px 3px rgba(0,0,0,0.08);
  --sidebar-w: 220px;
  --node-fill: #ffffff;
  --node-stroke: #d0d7de;
  --canvas-bg: #f3f6f9;
  --ip-bg: rgba(255,255,255,0.85);
  --icon-backdrop: transparent;
  --pip-icon-muted: #64748b;
  --trash-active-bg: #fff0f0;
  --input-bg: #ffffff;
}

[data-theme="dark"] {
  --bg: #0f1419;
  --card: #1e2830;
  --border: #2a3540;
  --border-light: #232e38;
  --accent: #2ec4a0;
  --accent-light: #1a3a30;
  --accent-bg: #152a24;
  --text: #d4dbe3;
  --text-muted: #8899a6;
  --text-faint: #5b6b78;
  --danger: #e05545;
  --warning: #d4a917;
  --shadow: 0 1px 3px rgba(0,0,0,0.3);
  --node-fill: #2e3d47;
  --node-stroke: #3a4a55;
  --canvas-bg: #141c22;
  --ip-bg: rgba(30,40,48,0.9);
  --icon-backdrop: transparent;
  --pip-icon-muted: white;
  --trash-active-bg: #3a1a1a;
  --input-bg: #253340;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1419;
    --card: #1e2830;
    --border: #2a3540;
    --border-light: #232e38;
    --accent: #2ec4a0;
    --accent-light: #1a3a30;
    --accent-bg: #152a24;
    --text: #d4dbe3;
    --text-muted: #8899a6;
    --text-faint: #5b6b78;
    --danger: #e05545;
    --warning: #d4a917;
    --shadow: 0 1px 3px rgba(0,0,0,0.3);
    --node-fill: #2e3d47;
    --node-stroke: #3a4a55;
    --canvas-bg: #141c22;
    --ip-bg: rgba(30,40,48,0.9);
    --icon-backdrop: transparent;
    --pip-icon-muted: white;
    --trash-active-bg: #3a1a1a;
    --input-bg: #253340;
  }
}

/* ── Reset ─────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  overflow: hidden;
  height: 100vh;
}

/* ── Layout ────────────────────────────────────────────────── */
.layout { display: flex; height: 100vh; }

/* ── Sidebar ──────────────────────────────────────────────── */
.sidebar, .legend, .toolbar {
  -webkit-user-select: none;
  user-select: none;
}
.sidebar {
  width: var(--sidebar-w);
  min-width: var(--sidebar-w);
  background: var(--card);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.sidebar-header {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
}
.brand {
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.3px;
}
.sidebar-section {
  padding: 12px 14px;
  overflow-y: auto;
}
.sidebar-section-grow { flex: 1; }
.sidebar-divider {
  height: 1px;
  background: var(--border);
}

/* ── Palette ───────────────────────────────────────────────── */
.palette-items {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.palette-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 7px 10px;
  border: 1px solid var(--border-light);
  border-radius: 6px;
  cursor: grab;
  transition: all 0.12s;
  user-select: none;
}
.palette-item:hover {
  border-color: var(--accent);
  background: var(--accent-bg);
}
.palette-item:active { cursor: grabbing; }
.palette-icon { font-size: 18px; flex-shrink: 0; width: 24px; text-align: center; }
.palette-text { display: flex; flex-direction: column; }
.palette-name { font-size: 12px; font-weight: 600; line-height: 1.2; }
.palette-desc { font-size: 10px; color: var(--text-muted); line-height: 1.2; }

/* ── Network list ──────────────────────────────────────────── */
.item-list { list-style: none; }
.item-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.1s;
  margin-bottom: 2px;
}
.item-row:hover { background: var(--bg); }
.item-dot { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }
.item-name { font-size: 12px; font-weight: 600; }
.item-sub { font-size: 10px; color: var(--text-muted); }
.stitle {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  margin: 12px 0 6px;
}
.stitle:first-child { margin-top: 0; }

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

/* ── Toolbar ───────────────────────────────────────────────── */
.sidebar-actions {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 8px 10px;
  overflow: visible;
  position: relative;
  z-index: 20;
}
.sidebar-btn-row {
  display: flex;
  gap: 4px;
  align-items: stretch;
}
.sidebar-btn-row > * {
  min-width: 0;
}
.sidebar-btn-row .dropdown {
  flex: 1.1 1 0;
}
.sidebar-btn-row #auto-layout-btn {
  flex: 1 1 0;
}
.sidebar-btn-row #fit-btn {
  flex: 0 0 40px;
}
.sidebar-btn-row .btn,
.sidebar-btn-row .btn-sm {
  padding: 4px 8px;
  font-size: 12px;
  height: 28px;
  min-width: 0;
}
.topo-name-input {
  border: 1px solid transparent;
  border-radius: 4px;
  padding: 4px 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  background: transparent;
  width: 100%;
}
.topo-name-input:hover { border-color: var(--border); }
.topo-name-input:focus {
  outline: none;
  border-color: var(--accent);
  background: var(--input-bg);
}
.toolbar-select {
  padding: 4px 8px;
  height: 28px;
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 5px;
  font-size: 12px;
  color: var(--text-muted);
  background: var(--input-bg);
  cursor: pointer;
}
.toolbar-input {
  height: 28px;
  width: 100%;
  padding: 4px 8px;
  border: 1px solid var(--border);
  border-radius: 5px;
  font-size: 12px;
  color: var(--text);
  background: var(--input-bg);
}
.toolbar-input::placeholder {
  color: var(--text-muted);
}
.toolbar-input:focus,
.toolbar-select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-light);
}
.theme-toggle {
  display: flex;
  gap: 2px;
  background: var(--bg);
  border-radius: 5px;
  padding: 1px;
}
.floating-controls {
  position: absolute;
  top: 10px;
  right: 10px;
  z-index: 40;
  display: flex;
  align-items: center;
  gap: 6px;
}
.floating-controls .theme-toggle {
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}
.floating-help-btn {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text-muted);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow);
  position: relative;
}
.floating-help-btn:hover { color: var(--text); }
.floating-link-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 46px;
  height: 24px;
  padding: 0 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 600;
  text-decoration: none;
  box-shadow: var(--shadow);
}
.floating-link-btn:hover {
  color: var(--text);
  background: var(--card);
}
.help-popover {
  display: none;
  position: absolute;
  top: 32px;
  right: 0;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.12);
  padding: 8px 12px;
  white-space: nowrap;
  z-index: 101;
}
.help-popover.open { display: block; }
.help-row {
  font-size: 12px;
  color: var(--text);
  padding: 3px 0;
  display: flex;
  align-items: center;
  gap: 8px;
}
.help-row kbd {
  display: inline-block;
  min-width: 70px;
  padding: 1px 5px;
  font-size: 10px;
  font-family: inherit;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 3px;
  color: var(--text-muted);
  text-align: center;
}
.theme-toggle button {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 22px;
  border: none;
  background: none;
  border-radius: 4px;
  cursor: pointer;
  color: var(--text-faint);
  padding: 0;
}
.theme-toggle button:hover { color: var(--text-muted); }
.theme-toggle button.active {
  background: var(--card);
  color: var(--accent);
  box-shadow: var(--shadow);
}
.theme-toggle svg { width: 14px; height: 14px; }

/* ── Buttons ───────────────────────────────────────────────── */
.btn {
  padding: 5px 12px;
  border: 1px solid var(--border);
  border-radius: 5px;
  font-size: 12px;
  cursor: pointer;
  background: var(--input-bg);
  color: var(--text-muted);
  transition: all 0.12s;
  white-space: nowrap;
}
.btn:hover { background: var(--border); color: var(--text); border-color: var(--border); }
.btn:active { background: var(--border-light); transform: scale(0.97); }
.btn-sm { padding: 3px 8px; font-size: 11px; }
.btn-danger { color: var(--danger); }
.btn-danger:hover { background: var(--trash-active-bg); border-color: var(--danger); }
.btn-group { display: flex; gap: 6px; margin-top: 12px; }

/* ── Dropdown ──────────────────────────────────────────────── */
.dropdown { position: relative; }
.dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  margin-top: 4px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.12);
  min-width: 200px;
  max-width: min(260px, calc(100vw - 24px));
  z-index: 100;
  padding: 4px 0;
}
.dropdown-menu.open { display: block; }
.dropdown-item {
  display: block;
  width: 100%;
  padding: 6px 14px;
  border: none;
  background: none;
  font-size: 13px;
  text-align: left;
  cursor: pointer;
  color: var(--text);
}
.dropdown-item:hover { background: var(--bg); }
.dropdown-divider { height: 1px; background: var(--border-light); margin: 4px 0; }

.sidebar-storage {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 2px 0 0;
}
.sidebar-storage-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
}
.sidebar-storage-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.4px;
  text-transform: uppercase;
  color: var(--text-muted);
}
.sidebar-storage-meta {
  font-size: 10px;
  color: var(--text-faint);
}
.sidebar-save-row {
  display: flex;
  gap: 4px;
}
.sidebar-save-name {
  flex: 1 1 auto;
  min-width: 0;
  font-size: 11px;
}
.sidebar-save-btn {
  flex: 0 0 auto;
  min-width: 50px;
}

/* ── Canvas ────────────────────────────────────────────────── */
.canvas-wrap {
  flex: 1;
  position: relative;
  overflow: hidden;
  background: var(--canvas-bg);
  min-height: 0;
}
svg#canvas {
  width: 100%;
  height: 100%;
  display: block;
  position: relative;
  -webkit-user-select: none;
  user-select: none;
}
.node-group:hover .node-box-bg {
  filter: drop-shadow(0 2px 6px rgba(0,0,0,0.15));
}
.node-group:hover { cursor: grab; }

/* ── Legend ─────────────────────────────────────────────────── */
.legend {
  position: absolute;
  bottom: 12px;
  left: 12px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  z-index: 40;
  min-width: 170px;
  font-size: 11px;
  overflow: hidden;
  user-select: none;
}
.legend-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 12px;
  cursor: pointer;
  font-weight: 600;
  font-size: 11px;
  color: var(--text-muted);
}
.legend-header:hover { background: var(--bg); }
.legend-chevron {
  font-size: 9px;
  transition: transform 0.15s;
}
.legend.collapsed .legend-chevron { transform: rotate(-90deg); }
.legend-body {
  padding: 4px 12px 10px;
}
.legend.collapsed .legend-body { display: none; }
.legend-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 3px 0;
}
.legend-row label {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  font-size: 11px;
  color: var(--text);
}
.legend-row label input { cursor: pointer; }
.legend-swatch {
  display: inline-block;
  width: 14px;
  height: 14px;
  border-radius: 4px;
  flex-shrink: 0;
}
.legend-swatch-line {
  display: inline-block;
  width: 14px;
  height: 3px;
  border-radius: 2px;
  flex-shrink: 0;
}
.legend-swatch-circle {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
  border: 1.5px solid white;
  box-shadow: 0 0 0 1px var(--border);
}
.legend-swatch-dash {
  display: inline-block;
  width: 14px;
  height: 0;
  border-top: 2px dashed #7c3aed;
  flex-shrink: 0;
}
.legend-divider {
  height: 1px;
  background: var(--border-light);
  margin: 4px 0;
}

/* ── Firewall rules panel ──────────────────────────────────── */
.fw-panel {
  position: absolute;
  bottom: 12px;
  right: 12px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  z-index: 40;
  min-width: 200px;
  max-width: 520px;
  font-size: 11px;
  overflow: hidden;
  user-select: none;
}
.fw-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 12px;
  cursor: pointer;
  font-weight: 600;
  font-size: 11px;
  color: var(--text-muted);
}
.fw-panel-header:hover { background: var(--bg); }
.fw-panel-chevron {
  font-size: 9px;
  transition: transform 0.15s;
}
.fw-panel.collapsed .fw-panel-chevron { transform: rotate(-90deg); }
.fw-panel-body {
  max-height: 220px;
  overflow-y: auto;
  padding: 0 12px 8px;
}
.fw-panel.collapsed .fw-panel-body { display: none; }
.fw-panel table {
  border-collapse: collapse;
  width: 100%;
  font-size: 10px;
}
.fw-panel th {
  text-align: left;
  font-weight: 600;
  color: var(--text-muted);
  padding: 3px 8px 3px 0;
  border-bottom: 1px solid var(--border);
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.3px;
  white-space: nowrap;
}
.fw-panel td {
  padding: 3px 8px 3px 0;
  border-bottom: 1px solid var(--border-light);
  white-space: nowrap;
}
.fw-panel td.fw-arrow {
  color: var(--text-faint);
  padding: 3px 4px;
}
.fw-panel .fw-empty {
  color: var(--text-faint);
  text-align: center;
  padding: 12px 0;
  font-size: 10px;
}

/* ── Trash zone ───────────────────────────────────────────── */
.trash-zone {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  background: var(--card);
  border: 2px dashed var(--border);
  border-radius: 12px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  opacity: 0;
  pointer-events: none;
  transition: all 0.2s;
  z-index: 50;
}
.trash-zone.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}
.trash-zone.active {
  border-color: var(--danger);
  background: var(--trash-active-bg, #fff0f0);
  color: var(--danger);
  box-shadow: 0 0 12px rgba(207, 34, 46, 0.3);
}
.trash-icon { font-size: 20px; }

/* ── Modal ─────────────────────────────────────────────────── */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.3);
  z-index: 300;
  justify-content: center;
  align-items: flex-start;
  padding-top: 10vh;
}
.modal-overlay.open {
  display: flex;
}
.modal {
  background: var(--card);
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.18);
  width: 380px;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  animation: modal-in 0.15s ease-out;
}
@keyframes modal-in {
  from { transform: translateY(-10px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}
.modal-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
}
.modal-icon { font-size: 22px; }
.modal-title { font-size: 15px; font-weight: 600; flex: 1; }
.modal-close {
  background: none;
  border: none;
  font-size: 20px;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 4px;
  line-height: 1;
}
.modal-close:hover { background: var(--bg); color: var(--text); }
.modal-body {
  padding: 16px 18px;
  overflow-y: auto;
  flex: 1;
}

/* ── Form (shared between modal and sidebar) ──────────────── */
.field { margin-bottom: 10px; }
.field label {
  display: block;
  font-size: 11px;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 3px;
}
.field input[type="text"],
.field input[type="color"],
.field select,
.field-select {
  width: 100%;
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 13px;
  color: var(--text);
  background: var(--input-bg);
}
.field input[type="color"] {
  padding: 2px;
  height: 34px;
  cursor: pointer;
}
.field input:focus, .field select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-light);
}
.help { font-size: 10px; color: var(--text-faint); margin-top: 2px; }
.iface-card {
  background: var(--input-bg);
  border: 1px solid var(--border-light);
  border-radius: 6px;
  padding: 8px 10px;
  margin-bottom: 6px;
}
.iface-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 4px;
}
.iface-header span { font-size: 11px; font-weight: 600; }
.add-iface {
  display: flex;
  gap: 6px;
  align-items: center;
  margin-top: 6px;
}
.add-iface select, .add-iface input { flex: 1; }
.iface-card input, .iface-card select { background: var(--input-bg); color: var(--text); }
.text-muted { color: var(--text-muted); font-size: 12px; }
.iface-dot {
  display: inline-block;
  width: 8px; height: 8px;
  border-radius: 50%;
  margin-right: 4px;
  vertical-align: middle;
}

/* ── Warnings ──────────────────────────────────────────────── */
.warnings-badge {
  font-size: 11px;
  font-weight: 600;
  color: var(--warning);
  cursor: pointer;
  padding: 2px 8px;
  border-radius: 10px;
  user-select: none;
  min-width: 20px;
  text-align: center;
}
.warnings-badge.has-warnings {
  background: #fff8e1;
  border: 1px solid #ffe082;
}
.warnings-panel {
  display: none;
  background: var(--card);
  border-top: 1px solid var(--border);
  padding: 8px 16px;
  font-size: 11px;
  max-height: 140px;
  overflow-y: auto;
}
.warnings-panel.open { display: block; }
.warnings-panel ul { list-style: none; padding: 0; }
.warnings-panel li {
  padding: 3px 0;
  border-bottom: 1px solid var(--border-light);
  color: var(--warning);
}
.warnings-panel li strong { color: var(--text); }

/* ── Flash ─────────────────────────────────────────────────── */
.flash {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(60px);
  background: #1f2328;
  color: white;
  padding: 8px 20px;
  border-radius: 8px;
  font-size: 12px;
  font-weight: 500;
  opacity: 0;
  transition: all 0.2s;
  pointer-events: none;
  z-index: 200;
}
.flash.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}