:root {
  --bg: #0a0d14;
  --bg2: #111520;
  --border: rgba(255,255,255,0.07);
  --text: #e8e4d8;
  --text2: #9a9585;
  --text3: #6b6660;
  --gold: #c8a84b;
  --era1: #4a90c4;
  --era2: #56b87a;
  --era3: #c8832a;
  --era4: #c44b7a;
  --era5: #7a5bc4;
  --era6: #c45050;
  --wonder: #c8a84b;
  --radius: 6px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { background: var(--bg); color: var(--text); font-family: 'Inter', system-ui, sans-serif; min-height: 100vh; overflow: hidden; }

/* HEADER */
header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(10,13,20,0.96); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  height: 54px; padding: 0 20px;
  display: flex; align-items: center; gap: 16px;
}
.logo { font-family: 'Cinzel', serif; font-weight: 900; font-size: 17px; letter-spacing: 0.12em; color: var(--gold); flex: 1; }
.logo span { color: var(--text2); font-weight: 400; }
.lang-toggle { display: flex; gap: 2px; background: rgba(255,255,255,0.05); border: 1px solid var(--border); border-radius: 20px; padding: 3px; }
.lang-btn { font-family: 'Cinzel', serif; font-size: 10px; letter-spacing: 0.1em; padding: 4px 12px; border-radius: 16px; border: none; background: transparent; color: var(--text2); cursor: pointer; transition: all 0.2s; }
.lang-btn.active { background: var(--gold); color: #0a0d14; font-weight: 700; }
.zoom-ctrl { display: flex; align-items: center; gap: 2px; background: rgba(255,255,255,0.05); border: 1px solid var(--border); border-radius: 20px; padding: 3px 6px; }
.zoom-btn { font-size: 14px; width: 26px; height: 26px; border-radius: 50%; border: none; background: transparent; color: var(--text2); cursor: pointer; display: flex; align-items: center; justify-content: center; transition: all 0.15s; }
.zoom-btn:hover { background: rgba(255,255,255,0.1); color: var(--text); }
.zoom-label { font-family: 'Cinzel', serif; font-size: 10px; letter-spacing: 0.08em; color: var(--text2); min-width: 38px; text-align: center; }

/* SEARCH */
.search-wrap { position: relative; display: flex; align-items: center; }
.search-input {
  background: rgba(255,255,255,0.05); border: 1px solid var(--border);
  border-radius: 20px; color: var(--text); font-family: 'Cinzel', serif;
  font-size: 10px; letter-spacing: 0.06em; padding: 5px 28px 5px 12px;
  outline: none; width: 160px; transition: border-color 0.2s, width 0.2s;
}
.search-input:focus { border-color: rgba(255,255,255,0.25); width: 200px; }
.search-input::placeholder { color: var(--text3); }
.search-input.active { border-color: var(--gold); }
.search-clear {
  position: absolute; right: 8px; background: none; border: none;
  color: var(--text3); cursor: pointer; font-size: 14px; line-height: 1;
  padding: 0; display: none; transition: color 0.15s;
}
.search-clear:hover { color: var(--text); }
.search-clear.visible { display: block; }

/* VIEWPORT */
#viewport { position: fixed; top: 54px; left: 0; right: 0; bottom: 0; overflow: hidden; cursor: grab; user-select: none; }
#viewport.panning { cursor: grabbing; }
#world { position: absolute; top: 0; left: 0; transform-origin: 0 0; }

/* SVG */
#svg-layer { position: absolute; top: 0; left: 0; overflow: visible; pointer-events: none; z-index: 1; }

/* NODES */
.tech-node {
  position: absolute; border-radius: var(--radius); border: 1px solid;
  padding: 8px 10px; cursor: pointer; z-index: 2;
  display: flex; flex-direction: column; gap: 3px;
  transition: box-shadow 0.15s, border-color 0.15s;
  overflow: hidden;
}
.tech-node::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px; border-radius: var(--radius) var(--radius) 0 0; }
.tech-node:hover { z-index: 5; }

.era-1 { background: rgba(74,144,196,0.1); border-color: rgba(74,144,196,0.3); }
.era-1::before { background: var(--era1); }
.era-1:hover { border-color: var(--era1); box-shadow: 0 4px 20px rgba(74,144,196,0.2); }

.era-2 { background: rgba(86,184,122,0.1); border-color: rgba(86,184,122,0.3); }
.era-2::before { background: var(--era2); }
.era-2:hover { border-color: var(--era2); box-shadow: 0 4px 20px rgba(86,184,122,0.2); }

.era-3 { background: rgba(200,131,42,0.1); border-color: rgba(200,131,42,0.3); }
.era-3::before { background: var(--era3); }
.era-3:hover { border-color: var(--era3); box-shadow: 0 4px 20px rgba(200,131,42,0.2); }

.era-4 { background: rgba(196,75,122,0.1); border-color: rgba(196,75,122,0.3); }
.era-4::before { background: var(--era4); }
.era-4:hover { border-color: var(--era4); box-shadow: 0 4px 20px rgba(196,75,122,0.2); }

.era-5 { background: rgba(122,91,196,0.1); border-color: rgba(122,91,196,0.3); }
.era-5::before { background: var(--era5); }
.era-5:hover { border-color: var(--era5); box-shadow: 0 4px 20px rgba(122,91,196,0.2); }

.era-6 { background: rgba(196,80,80,0.1); border-color: rgba(196,80,80,0.3); }
.era-6::before { background: var(--era6); }
.era-6:hover { border-color: var(--era6); box-shadow: 0 4px 20px rgba(196,80,80,0.2); }

.wonder-node { background: rgba(200,168,75,0.08); border-color: rgba(200,168,75,0.35); border-style: dashed; }
.wonder-node::before { background: var(--wonder); }
.wonder-node:hover { border-color: var(--wonder); box-shadow: 0 4px 20px rgba(200,168,75,0.2); }

.era-unlock { border-width: 1.5px; }
.era-1.era-unlock { border-color: var(--era1); box-shadow: 0 0 10px rgba(74,144,196,0.15); }
.era-2.era-unlock { border-color: var(--era2); box-shadow: 0 0 10px rgba(86,184,122,0.15); }
.era-3.era-unlock { border-color: var(--era3); box-shadow: 0 0 10px rgba(200,131,42,0.15); }
.era-4.era-unlock { border-color: var(--era4); box-shadow: 0 0 10px rgba(196,75,122,0.15); }
.era-5.era-unlock { border-color: var(--era5); box-shadow: 0 0 10px rgba(122,91,196,0.15); }
.era-6.era-unlock { border-color: var(--era6); box-shadow: 0 0 10px rgba(196,80,80,0.15); }

.node-era-badge { font-family: 'Cinzel', serif; font-size: 8px; letter-spacing: 0.15em; text-transform: uppercase; font-weight: 700; opacity: 0.7; }
.era-1 .node-era-badge { color: var(--era1); }
.era-2 .node-era-badge { color: var(--era2); }
.era-3 .node-era-badge { color: var(--era3); }
.era-4 .node-era-badge { color: var(--era4); }
.era-5 .node-era-badge { color: var(--era5); }
.era-6 .node-era-badge { color: var(--era6); }
.wonder-node .node-era-badge { color: var(--wonder); }
.node-name { font-family: 'Cinzel', serif; font-size: 11px; font-weight: 700; letter-spacing: 0.02em; color: var(--text); line-height: 1.3; }
.node-desc { font-family: 'Inter', sans-serif; font-size: 9.5px; font-weight: 300; color: var(--text2); line-height: 1.4; white-space: pre-line; }
.node-costs { display: flex; gap: 8px; margin-top: 2px; }
.node-cost { font-family: 'Cinzel', serif; font-size: 9px; color: var(--text3); display: flex; align-items: center; gap: 3px; }

/* SELECTION STATES */
.node-faded { opacity: 0.1 !important; transition: opacity 0.25s; }
.node-path { opacity: 1 !important; transition: opacity 0.25s; }
.node-selected { opacity: 1 !important; box-shadow: 0 0 0 2px white, 0 0 24px rgba(255,255,255,0.2) !important; z-index: 10 !important; transform: scale(1.02); transition: opacity 0.25s, box-shadow 0.25s; }
.edge-path { opacity: 0.42; transition: opacity 0.2s, stroke-width 0.2s; }
.edge-faded { opacity: 0.04 !important; }
.edge-active { opacity: 1 !important; stroke-width: 2.5px !important; }

/* DETAIL PANEL */
#detail-panel {
  position: fixed; right: 0; top: 54px; bottom: 0; width: 300px;
  background: var(--bg2); border-left: 1px solid var(--border);
  transform: translateX(100%); transition: transform 0.3s cubic-bezier(0.4,0,0.2,1);
  z-index: 50; display: flex; flex-direction: column; overflow: hidden;
}
#detail-panel.open { transform: translateX(0); }
.panel-header { padding: 18px 18px 14px; border-bottom: 1px solid var(--border); position: relative; }
.panel-stripe { position: absolute; top: 0; left: 0; right: 0; height: 3px; }
.panel-era-label { font-family: 'Cinzel', serif; font-size: 9px; letter-spacing: 0.2em; text-transform: uppercase; margin-bottom: 6px; opacity: 0.8; }
.panel-title { font-family: 'Cinzel', serif; font-size: 17px; font-weight: 700; color: var(--text); line-height: 1.2; margin-bottom: 12px; }
.panel-costs { display: flex; gap: 16px; }
.panel-cost-item { display: flex; flex-direction: column; gap: 2px; }
.panel-cost-label { font-family: 'Cinzel', serif; font-size: 8px; letter-spacing: 0.15em; text-transform: uppercase; color: var(--text3); }
.panel-cost-value { font-family: 'Cinzel', serif; font-size: 14px; font-weight: 700; color: var(--gold); }
.panel-body { flex: 1; overflow-y: auto; padding: 14px 18px; }
.panel-body::-webkit-scrollbar { width: 4px; }
.panel-body::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }
.panel-section { margin-bottom: 18px; }
.panel-section-title { font-family: 'Cinzel', serif; font-size: 9px; letter-spacing: 0.2em; text-transform: uppercase; color: var(--text3); margin-bottom: 8px; padding-bottom: 4px; border-bottom: 1px solid var(--border); }
.panel-desc { font-family: 'Inter', sans-serif; font-size: 13px; font-weight: 300; color: var(--text2); line-height: 1.6; white-space: pre-line; }
.req-list { display: flex; flex-direction: column; gap: 4px; }
.req-item { display: flex; align-items: center; gap: 6px; padding: 6px 10px; border-radius: 4px; background: rgba(255,255,255,0.03); border: 1px solid var(--border); font-family: 'Cinzel', serif; font-size: 9px; letter-spacing: 0.05em; color: var(--text2); cursor: pointer; transition: background 0.15s; }
.req-item:hover { background: rgba(255,255,255,0.06); }
.req-dot { width: 6px; height: 6px; border-radius: 50%; flex-shrink: 0; }
.req-type { font-size: 8px; color: var(--text3); margin-left: auto; }

/* CHAIN COST */
.chain-cost-block {
  margin-top: 14px; padding: 10px 12px; border-radius: var(--radius);
  background: rgba(255,255,255,0.03); border: 1px solid var(--border);
}
.chain-cost-title {
  font-family: 'Cinzel', serif; font-size: 8px; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--text3); margin-bottom: 8px;
  padding-bottom: 5px; border-bottom: 1px solid var(--border);
}
.chain-cost-row { display: flex; align-items: center; gap: 8px; margin-top: 5px; }
.chain-cost-value { font-family: 'Cinzel', serif; font-size: 13px; font-weight: 700; color: var(--gold); }
.chain-cost-sub { font-family: 'Inter', sans-serif; font-size: 9px; color: var(--text3); margin-left: auto; }
#close-panel { position: absolute; top: 12px; right: 12px; width: 28px; height: 28px; border-radius: 50%; border: 1px solid var(--border); background: transparent; color: var(--text2); font-size: 16px; cursor: pointer; display: flex; align-items: center; justify-content: center; transition: all 0.15s; }
#close-panel:hover { background: rgba(255,255,255,0.08); color: var(--text); }

/* RESEARCH TIME */
.panel-research-time {
  margin-top: 10px; padding: 8px 12px; border-radius: var(--radius);
  background: rgba(200,168,75,0.07); border: 1px solid rgba(200,168,75,0.18);
  display: flex; align-items: center; gap: 8px;
}
.panel-time-icon { font-size: 13px; }
.panel-time-value { font-family: 'Cinzel', serif; font-size: 13px; font-weight: 700; color: var(--gold); }
.panel-time-label { font-family: 'Inter', sans-serif; font-size: 9px; color: var(--text3); margin-left: auto; }

/* QUEUE BUTTON */
.queue-btn {
  margin-top: 12px; width: 100%; padding: 8px 0;
  font-family: 'Cinzel', serif; font-size: 10px; letter-spacing: 0.12em; text-transform: uppercase;
  border: 1px solid rgba(200,168,75,0.4); border-radius: var(--radius);
  background: rgba(200,168,75,0.08); color: var(--gold); cursor: pointer; transition: all 0.15s;
}
.queue-btn:hover { background: rgba(200,168,75,0.18); border-color: var(--gold); }
.queue-btn.in-queue { background: rgba(200,168,75,0.2); border-color: var(--gold); color: var(--gold); }

/* LEGEND */
#legend { position: fixed; bottom: 14px; left: 14px; background: rgba(10,13,20,0.9); border: 1px solid var(--border); border-radius: var(--radius); padding: 8px 12px; z-index: 40; display: flex; gap: 12px; flex-wrap: wrap; backdrop-filter: blur(8px); }
.legend-item { display: flex; align-items: center; gap: 6px; font-family: 'Cinzel', serif; font-size: 8px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text3); }
.legend-line { width: 18px; height: 2px; border-radius: 1px; opacity: 0.6; }

/* HINT */
#hint { position: fixed; bottom: 14px; right: 14px; font-family: 'Cinzel', serif; font-size: 9px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--text3); animation: fadeOut 5s 2s forwards; }
@keyframes fadeOut { to { opacity: 0; } }

/* VIEW MODE TOGGLE */
.view-toggle { display: flex; gap: 2px; background: rgba(255,255,255,0.05); border: 1px solid var(--border); border-radius: 20px; padding: 3px; }
.view-btn { font-family: 'Cinzel', serif; font-size: 9px; letter-spacing: 0.08em; padding: 4px 11px; border-radius: 16px; border: none; background: transparent; color: var(--text2); cursor: pointer; transition: all 0.2s; white-space: nowrap; }
.view-btn.active { background: rgba(255,255,255,0.12); color: var(--text); }

/* CHECKBOX on node */
.node-check {
  position: absolute; top: 7px; right: 7px;
  width: 16px; height: 16px; border-radius: 4px;
  border: 1.5px solid rgba(255,255,255,0.18); background: transparent;
  cursor: pointer; display: flex; align-items: center; justify-content: center;
  z-index: 10; transition: border-color 0.15s, background 0.15s; flex-shrink: 0;
}
.node-check:hover { border-color: rgba(255,255,255,0.5); }
.node-check.checked { background: #c0392b; border-color: #e74c3c; }
.node-check.checked::after { content: '✓'; color: #fff; font-size: 10px; font-weight: 700; line-height: 1; }

.tech-node.node-checked {
  border-color: rgba(192,57,43,0.7) !important;
  background-image: linear-gradient(rgba(192,57,43,0.12), rgba(192,57,43,0.12)) !important;
  box-shadow: 0 0 12px rgba(192,57,43,0.25) !important;
}
.tech-node.node-checked::before { background: #c0392b !important; }

.tech-node.node-hidden { opacity: 0.35 !important; pointer-events: none; }

/* CITY BUTTON */
.city-btn {
  font-family: 'Cinzel', serif; font-size: 10px; letter-spacing: 0.1em;
  padding: 5px 13px; border-radius: 16px; border: 1px solid var(--border);
  background: rgba(255,255,255,0.05); color: var(--text2); cursor: pointer;
  transition: all 0.2s; white-space: nowrap; display: flex; align-items: center; gap: 6px;
}
.city-btn:hover { background: rgba(255,255,255,0.1); color: var(--text); border-color: rgba(255,255,255,0.2); }
.city-btn.has-values { border-color: var(--gold); color: var(--gold); }

/* CITY MODAL */
#city-modal-overlay { position: fixed; inset: 0; z-index: 200; background: transparent; display: none; }
#city-modal-overlay.open { display: block; }
#city-modal {
  position: absolute; background: var(--bg2); border: 1px solid var(--border);
  border-radius: 10px; width: 240px; box-shadow: 0 8px 40px rgba(0,0,0,0.7); overflow: hidden;
}
.city-modal-header { padding: 14px 16px 10px; border-bottom: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; }
.city-modal-title { font-family: 'Cinzel', serif; font-size: 12px; font-weight: 700; letter-spacing: 0.1em; color: var(--text); }
.city-modal-close { width: 24px; height: 24px; border-radius: 50%; border: 1px solid var(--border); background: transparent; color: var(--text2); font-size: 14px; cursor: pointer; display: flex; align-items: center; justify-content: center; transition: all 0.15s; }
.city-modal-close:hover { background: rgba(255,255,255,0.08); color: var(--text); }
.city-modal-body { padding: 14px 16px 16px; display: flex; flex-direction: column; gap: 12px; }
.city-field { display: flex; flex-direction: column; gap: 5px; }
.city-field-label { font-family: 'Cinzel', serif; font-size: 8px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--text3); }
.city-field-row { display: flex; align-items: center; gap: 6px; }
.city-field-icon { font-size: 14px; }
.city-input {
  flex: 1; background: rgba(255,255,255,0.05); border: 1px solid var(--border);
  border-radius: 6px; color: var(--text); font-family: 'Cinzel', serif; font-size: 12px;
  padding: 6px 10px; outline: none; transition: border-color 0.15s;
  -moz-appearance: textfield;
}
.city-input::-webkit-outer-spin-button,
.city-input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.city-input:focus { border-color: var(--gold); }
.city-input::placeholder { color: var(--text3); }
.city-field-hint { font-family: 'Inter', sans-serif; font-size: 9px; color: var(--text3); line-height: 1.4; }

/* QUEUE PANEL */
#queue-panel {
  position: fixed; left: 0; top: 54px; bottom: 0; width: 260px;
  background: var(--bg2); border-right: 1px solid var(--border);
  transform: translateX(-100%); transition: transform 0.3s cubic-bezier(0.4,0,0.2,1);
  z-index: 50; display: flex; flex-direction: column; overflow: hidden;
}
#queue-panel.open { transform: translateX(0); }
.queue-header { padding: 14px 14px 10px; border-bottom: 1px solid var(--border); display: flex; align-items: center; gap: 8px; }
.queue-title { font-family: 'Cinzel', serif; font-size: 13px; font-weight: 700; color: var(--text); flex: 1; }
.queue-clear-btn { font-family: 'Cinzel', serif; font-size: 9px; letter-spacing: 0.1em; padding: 4px 10px; border-radius: 12px; border: 1px solid var(--border); background: transparent; color: var(--text3); cursor: pointer; transition: all 0.15s; }
.queue-clear-btn:hover { border-color: #c0392b; color: #c0392b; }
#close-queue { width: 26px; height: 26px; border-radius: 50%; border: 1px solid var(--border); background: transparent; color: var(--text2); font-size: 15px; cursor: pointer; display: flex; align-items: center; justify-content: center; transition: all 0.15s; flex-shrink: 0; }
#close-queue:hover { background: rgba(255,255,255,0.08); color: var(--text); }
.queue-list { flex: 1; overflow-y: auto; padding: 8px 10px; display: flex; flex-direction: column; gap: 4px; }
.queue-list::-webkit-scrollbar { width: 4px; }
.queue-list::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }
.queue-item { display: flex; align-items: center; gap: 7px; padding: 6px 9px; border-radius: 4px; background: rgba(255,255,255,0.03); border: 1px solid var(--border); }
.queue-item-num { font-family: 'Cinzel', serif; font-size: 9px; color: var(--text3); min-width: 16px; text-align: right; }
.queue-item-dot { width: 6px; height: 6px; border-radius: 50%; flex-shrink: 0; }
.queue-item-name { font-family: 'Cinzel', serif; font-size: 9px; letter-spacing: 0.03em; color: var(--text2); flex: 1; }
.queue-item-remove { font-size: 11px; color: var(--text3); cursor: pointer; padding: 2px 4px; border-radius: 3px; transition: color 0.15s; line-height: 1; background: none; border: none; }
.queue-item-remove:hover { color: #c0392b; }
.queue-empty { font-family: 'Cinzel', serif; font-size: 10px; letter-spacing: 0.1em; color: var(--text3); text-align: center; padding: 30px 0; }
.queue-footer { padding: 10px 14px; border-top: 1px solid var(--border); }
.queue-total { font-family: 'Cinzel', serif; font-size: 9px; letter-spacing: 0.1em; color: var(--text3); display: flex; flex-direction: column; gap: 3px; }
.queue-total span { color: var(--gold); }
#queue-toggle-btn {
  font-family: 'Cinzel', serif; font-size: 10px; letter-spacing: 0.1em;
  padding: 5px 13px; border-radius: 16px; border: 1px solid var(--border);
  background: rgba(255,255,255,0.05); color: var(--text2); cursor: pointer;
  transition: all 0.2s; white-space: nowrap;
}
#queue-toggle-btn:hover { background: rgba(255,255,255,0.1); color: var(--text); border-color: rgba(255,255,255,0.2); }
#queue-toggle-btn.has-queue { border-color: var(--gold); color: var(--gold); }
.queue-error { font-family: 'Inter', sans-serif; font-size: 11px; color: #e74c3c; padding: 8px 10px; background: rgba(192,57,43,0.1); border: 1px solid rgba(192,57,43,0.3); border-radius: var(--radius); margin: 0 10px 6px; line-height: 1.4; }

/* QUEUE NODE BADGE */
.queue-badge {
  position: absolute; top: 5px; left: 5px;
  width: 17px; height: 17px; border-radius: 50%;
  background: var(--gold); color: #0a0d14;
  font-family: 'Cinzel', serif; font-size: 9px; font-weight: 900;
  display: flex; align-items: center; justify-content: center;
  z-index: 11; line-height: 1; box-shadow: 0 1px 4px rgba(0,0,0,0.5); pointer-events: none;
}
.tech-node.node-queued {
  border-color: rgba(200,168,75,0.7) !important;
  background-image: linear-gradient(rgba(200,168,75,0.08), rgba(200,168,75,0.08)) !important;
}
.tech-node.node-queued::before { background: var(--gold) !important; }

/* EXPORT BUTTONS */
.export-row { display: flex; gap: 6px; margin-top: 10px; }
.export-btn {
  flex: 1; padding: 6px 0;
  font-family: 'Cinzel', serif; font-size: 9px; letter-spacing: 0.1em;
  border: 1px solid var(--border); border-radius: var(--radius);
  background: rgba(255,255,255,0.04); color: var(--text2); cursor: pointer;
  transition: all 0.15s; text-align: center;
}
.export-btn:hover { background: rgba(255,255,255,0.1); color: var(--text); border-color: rgba(255,255,255,0.2); }