:root {
  --bg: #07080c;
  --surface: rgba(255, 255, 255, 0.045);
  --surface-hi: rgba(255, 255, 255, 0.08);
  --panel-bg: rgba(20, 22, 30, 0.85);
  --text: #eef0f6;
  --text-dim: #9096a6;
  --text-faint: #656b7c;
  --border: rgba(255, 255, 255, 0.09);
  --border-hi: rgba(255, 255, 255, 0.16);
  --accent: #6d8bff;
  --accent-soft: rgba(109, 139, 255, 0.15);
  --danger: #f2555a;
  /* tier colors */
  --prod: #34d399;
  --prod-glow: rgba(52, 211, 153, 0.35);
  --prod-bg: rgba(52, 211, 153, 0.12);
  --sub: #7c8398;
  --line: #ff5b6a;
  --line-glow: rgba(255, 91, 106, 0.5);
  --radius: 14px;
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.45);
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* Animated aurora background layer (drifting brand-colored blobs) */
body::before {
  content: "";
  position: fixed;
  inset: -20%;
  z-index: -2;
  background-image:
    radial-gradient(closest-side at 22% 30%, rgba(109, 139, 255, 0.30), transparent 70%),
    radial-gradient(closest-side at 78% 22%, rgba(52, 211, 153, 0.22), transparent 70%),
    radial-gradient(closest-side at 62% 78%, rgba(255, 91, 106, 0.20), transparent 70%),
    radial-gradient(closest-side at 30% 82%, rgba(167, 139, 250, 0.18), transparent 70%);
  filter: blur(30px);
  animation: aurora 26s ease-in-out infinite alternate;
}
/* subtle static grain/vignette above the aurora, below content */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background: radial-gradient(120% 120% at 50% 0%, transparent 55%, rgba(0, 0, 0, 0.55) 100%);
  pointer-events: none;
}
@keyframes aurora {
  0%   { transform: translate3d(0, 0, 0) scale(1); }
  50%  { transform: translate3d(3%, -2%, 0) scale(1.08); }
  100% { transform: translate3d(-3%, 2%, 0) scale(1.04); }
}
@media (prefers-reduced-motion: reduce) {
  body::before { animation: none; }
}

/* ---------- Topbar ---------- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 150; /* above the side panel (100) so buttons stay clickable */
  background: rgba(7, 8, 12, 0.72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}
.title {
  font-size: 19px;
  font-weight: 700;
  margin: 0;
  letter-spacing: 0.3px;
  display: flex;
  align-items: center;
  gap: 9px;
}
.title::before {
  content: "";
  width: 10px; height: 10px;
  border-radius: 3px;
  background: linear-gradient(135deg, var(--prod), var(--accent));
  box-shadow: 0 0 12px var(--prod-glow);
}
.topbar-right { display: flex; align-items: center; gap: 10px; }
.save-status {
  font-size: 12.5px;
  color: var(--text-dim);
  min-width: 46px;
  text-align: right;
  transition: color 0.2s;
}

.btn {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 16px;
  font-size: 13.5px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.16s, border-color 0.16s, transform 0.08s;
}
.btn:hover { background: var(--surface-hi); border-color: var(--border-hi); }
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: linear-gradient(135deg, var(--accent), #566fe0);
  border-color: transparent;
  color: #fff;
  box-shadow: 0 4px 16px rgba(109, 139, 255, 0.35);
}
.btn-primary:hover { filter: brightness(1.08); background: linear-gradient(135deg, var(--accent), #566fe0); }
.btn-danger { background: rgba(242, 85, 90, 0.14); border-color: rgba(242, 85, 90, 0.4); color: #ff8b8f; }
.btn-danger:hover { background: rgba(242, 85, 90, 0.22); }

/* ---------- Board ---------- */
main { padding: 28px 24px 40px; }
.board {
  position: relative;
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
}
.board-inner {
  position: relative;
  width: 100%;
  height: 72vh;
  min-height: 480px;
  border: 1px solid var(--border);
  border-radius: 20px;
  overflow: hidden;
  background:
    linear-gradient(180deg, rgba(52, 211, 153, 0.07) 0%, rgba(52, 211, 153, 0.02) 35%, rgba(255, 91, 106, 0.02) 70%, rgba(255, 91, 106, 0.06) 100%),
    linear-gradient(180deg, #12141d 0%, #0c0d14 100%);
  box-shadow: var(--shadow), inset 0 1px 0 rgba(255, 255, 255, 0.04);
}
/* faint horizontal reference gridlines */
.board-inner::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    to bottom,
    transparent 0,
    transparent calc(10% - 1px),
    rgba(255, 255, 255, 0.035) calc(10% - 1px),
    rgba(255, 255, 255, 0.035) 10%
  );
  pointer-events: none;
}

.axis-label {
  position: absolute;
  left: 14px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 2px;
  color: var(--text-faint);
  pointer-events: none;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 6px;
}
.axis-top { top: 12px; }
.axis-top::before { content: "▲"; font-size: 8px; color: var(--prod); }
.axis-bottom { bottom: 12px; }
.axis-bottom::before { content: "▼"; font-size: 8px; color: var(--line); }

/* Production line */
.prod-line {
  position: absolute;
  left: 0;
  right: 0;
  height: 0;
  border-top: 2px dashed var(--line);
  z-index: 5;
  box-shadow: 0 0 16px var(--line-glow);
  transition: top 0.05s linear;
}
.prod-line-label {
  position: absolute;
  right: 14px;
  top: -12px;
  background: linear-gradient(135deg, #ff6b78, var(--line));
  color: #fff;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.3px;
  padding: 3px 11px;
  border-radius: 20px;
  white-space: nowrap;
  box-shadow: 0 3px 12px var(--line-glow);
}
body.editing .prod-line { cursor: ns-resize; border-top-style: solid; }
body.editing .prod-line:hover { box-shadow: 0 0 22px var(--line-glow); }
body.editing .prod-line::after {
  content: "";
  position: absolute;
  left: 0; right: 0;
  top: -9px; height: 18px; /* fat hit area for dragging */
}

/* Model block */
.block {
  position: absolute;
  transform: translate(-50%, -50%);
  background: linear-gradient(180deg, var(--surface-hi), var(--surface));
  border: 1px solid var(--border-hi);
  border-radius: 12px;
  padding: 9px 14px;
  min-width: 76px;
  text-align: center;
  cursor: pointer;
  user-select: none;
  z-index: 10;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.4);
  transition: transform 0.12s ease, box-shadow 0.16s, border-color 0.16s;
}
.block:hover {
  transform: translate(-50%, -50%) translateY(-3px);
  border-color: var(--text-dim);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.5);
}
body.editing .block { cursor: grab; }
body.editing .block.dragging {
  cursor: grabbing;
  z-index: 30;
  transform: translate(-50%, -50%) scale(1.06);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.6);
}
.block-head {
  display: flex;
  align-items: center;
  gap: 8px;
  justify-content: center;
}
.block-icon {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  object-fit: contain;
  flex-shrink: 0;
  background: rgba(255, 255, 255, 0.9);
  padding: 2px;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}
.block-name {
  font-weight: 650;
  font-size: 14px;
  letter-spacing: 0.2px;
  white-space: nowrap;
}

/* Tier coloring driven by JS (above / below production line) */
.block.tier-prod {
  border-color: rgba(52, 211, 153, 0.55);
  background: linear-gradient(180deg, var(--prod-bg), rgba(52, 211, 153, 0.04));
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(52, 211, 153, 0.12), 0 0 22px var(--prod-glow);
}
.block.tier-prod .block-name { color: #d6fff0; }
.block.tier-prod::after {
  content: "";
  position: absolute;
  top: -4px; right: -4px;
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--prod);
  box-shadow: 0 0 10px var(--prod-glow);
}
.block.tier-sub { opacity: 0.92; }
.block.tier-sub .block-name { color: #c3c8d6; }

/* mini tags on the block */
.block-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  justify-content: center;
  margin-top: 6px;
}
.block-tag {
  font-size: 10px;
  line-height: 1;
  padding: 3px 7px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid var(--border);
  color: var(--text-dim);
  white-space: nowrap;
}
.tier-prod .block-tag { background: rgba(52, 211, 153, 0.14); border-color: rgba(52, 211, 153, 0.25); color: #a7f3d6; }

/* ---------- Panel ---------- */
.panel {
  position: fixed;
  top: var(--topbar-h, 56px); right: 0;
  width: 380px;
  max-width: 92vw;
  height: calc(100vh - var(--topbar-h, 56px));
  background: var(--panel-bg);
  backdrop-filter: blur(22px);
  -webkit-backdrop-filter: blur(22px);
  border-left: 1px solid var(--border);
  padding: 24px;
  overflow-y: auto;
  z-index: 100;
  box-shadow: -12px 0 40px rgba(0, 0, 0, 0.5);
  animation: panelIn 0.22s cubic-bezier(0.22, 1, 0.36, 1);
}
@keyframes panelIn {
  from { transform: translateX(24px); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}
.panel-close {
  position: absolute;
  top: 16px; right: 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  width: 30px; height: 30px;
  color: var(--text-dim);
  font-size: 20px; line-height: 1;
  cursor: pointer;
  transition: background 0.16s, color 0.16s;
}
.panel-close:hover { background: var(--surface-hi); color: var(--text); }
.panel-head { margin: 2px 0 22px; padding-right: 36px; }
.panel-title-row { display: flex; align-items: center; gap: 12px; }
.panel-icon {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  object-fit: contain;
  background: rgba(255, 255, 255, 0.92);
  padding: 3px;
  flex-shrink: 0;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.35);
}
.panel-name { margin: 0; font-size: 22px; font-weight: 700; letter-spacing: 0.2px; }
.logo-hint { font-size: 11px; color: var(--text-faint); margin-top: 7px; line-height: 1.5; }
.panel-name-input {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  padding: 10px 12px;
  font-size: 16px;
  font-family: inherit;
  transition: border-color 0.16s;
}
.panel-name-input:focus { outline: none; border-color: var(--accent); }
.panel-section { margin-bottom: 26px; }
.panel-section h3 {
  font-size: 11px;
  color: var(--text-faint);
  margin: 0 0 10px;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  font-weight: 700;
}

/* Tags */
.tag-list { display: flex; flex-wrap: wrap; gap: 7px; }
.tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: var(--accent-soft);
  border: 1px solid rgba(109, 139, 255, 0.28);
  border-radius: 20px;
  padding: 4px 12px;
  font-size: 13px;
  color: #c5d0ff;
}
.tag-remove {
  cursor: pointer;
  color: rgba(197, 208, 255, 0.6);
  font-weight: bold;
  transition: color 0.14s;
}
.tag-remove:hover { color: #fff; }
.tag-add { margin-top: 10px; }
.tag-add input, .comment-add textarea {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  padding: 10px 12px;
  font-size: 14px;
  font-family: inherit;
  transition: border-color 0.16s;
}
.tag-add input:focus, .comment-add textarea:focus, .comment-textarea:focus { outline: none; border-color: var(--accent); }
.comment-add { margin-bottom: 14px; }
.comment-add textarea { min-height: 64px; resize: vertical; margin-bottom: 8px; }

/* Comments */
.comment-list { list-style: none; margin: 0; padding: 0; }
.comment-item {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 14px;
  margin-bottom: 10px;
  background: rgba(255, 255, 255, 0.025);
  transition: border-color 0.16s;
}
.comment-item:hover { border-color: var(--border-hi); }
.comment-item:first-child { border-color: rgba(109, 139, 255, 0.3); }
.comment-text { white-space: pre-wrap; word-break: break-word; font-size: 14px; line-height: 1.55; }
.comment-meta {
  font-size: 11px;
  color: var(--text-faint);
  margin-top: 8px;
  display: flex;
  gap: 10px;
  align-items: center;
}
.comment-edit-btn { cursor: pointer; color: var(--accent); font-weight: 600; }
.comment-edit-btn:hover { text-decoration: underline; }
.comment-textarea {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 8px;
  font-size: 14px;
  font-family: inherit;
  min-height: 54px;
}
.comment-empty { color: var(--text-faint); font-size: 13px; font-style: italic; }

/* ---------- Modal ---------- */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  animation: fadeIn 0.18s ease;
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.modal-box {
  background: var(--panel-bg);
  backdrop-filter: blur(22px);
  -webkit-backdrop-filter: blur(22px);
  border: 1px solid var(--border-hi);
  border-radius: 18px;
  padding: 28px;
  width: 340px;
  max-width: 90vw;
  box-shadow: var(--shadow);
  animation: panelIn 0.22s cubic-bezier(0.22, 1, 0.36, 1);
}
.modal-box h2 { margin: 0 0 18px; font-size: 18px; font-weight: 700; }
.modal-box input {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  padding: 11px 13px;
  font-size: 15px;
  font-family: inherit;
  transition: border-color 0.16s;
}
.modal-box input:focus { outline: none; border-color: var(--accent); }
.login-error { color: var(--danger); font-size: 13px; margin-top: 10px; }
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 20px; }

[hidden] { display: none !important; }

/* thin scrollbar for the panel */
.panel::-webkit-scrollbar { width: 8px; }
.panel::-webkit-scrollbar-thumb { background: var(--border-hi); border-radius: 8px; }
.panel::-webkit-scrollbar-track { background: transparent; }