:root {
  --bg: #0b0d10;
  --panel: #1a1f26;
  --panel2: #232a33;
  --border: #4a5563;
  --accent: #d9a62e;
  --accent2: #f2c94c;
  --text: #e6e9ee;
  --muted: #8d98a6;
  --danger: #d94a3a;
  --ok: #52c46b;
  --sidebar-w: 220px;
  --topbar-h: 36px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { width: 100%; height: 100%; overflow: hidden; background: var(--bg); color: var(--text);
  font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif; user-select: none; -webkit-user-select: none; }
button { font-family: inherit; }

.screen { position: absolute; inset: 0; display: none; }
.screen.active { display: block; }
.hidden { display: none !important; }

.menu-bg { position: absolute; inset: 0;
  background:
    linear-gradient(90deg, rgba(8,6,6,0.25) 0%, rgba(8,6,6,0.05) 45%, rgba(8,6,6,0) 100%),
    linear-gradient(180deg, rgba(8,6,6,0) 60%, rgba(8,6,6,0.6) 100%),
    url('../assets/art/menu_mars.jpg') center / cover no-repeat,
    linear-gradient(#2a120a, #0a0605); }
.menu-panel { position: relative; width: 420px; max-width: 94vw; margin: 8vh auto 0; padding: 32px 28px;
  background: rgba(20,24,30,0.92); border: 2px solid var(--border); box-shadow: 0 0 0 4px #0b0d10, 0 20px 60px rgba(0,0,0,0.7);
  text-align: center; }
.menu-panel.wide { width: 640px; }
.menu-panel h2 { letter-spacing: 4px; color: var(--accent2); margin-bottom: 20px; font-weight: 700; }
.title { font-size: 56px; line-height: 0.95; letter-spacing: 6px; font-weight: 900; }
.title .t1 { display: block; color: var(--text); }
.title .t2 { display: block; color: var(--accent); text-shadow: 0 0 20px rgba(217,166,46,0.5); }
.subtitle { color: var(--muted); letter-spacing: 8px; font-size: 12px; margin: 10px 0 28px; }
.menu-buttons { display: flex; flex-direction: column; gap: 10px; }
.menu-buttons.row { flex-direction: row; justify-content: center; margin-top: 18px; }

.btn { background: linear-gradient(#2b333e, #1b2129); color: var(--text); border: 1px solid var(--border);
  padding: 10px 18px; font-size: 14px; letter-spacing: 2px; cursor: pointer; font-weight: 700; transition: all .08s; }
.btn:hover { background: linear-gradient(#3a4452, #232b35); border-color: var(--accent); color: var(--accent2); }
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: 0.4; cursor: default; }
.btn.big { padding: 16px; font-size: 18px; }
.btn.small { padding: 5px 10px; font-size: 11px; letter-spacing: 1px; }
.btn.danger { border-color: var(--danger); }

.version { position: absolute; right: 12px; bottom: 10px; color: var(--muted); font-size: 12px; font-family: monospace; }
.update-banner { position: absolute; left: 12px; bottom: 10px; background: var(--panel2); border: 1px solid var(--accent);
  padding: 8px 12px; display: flex; gap: 10px; align-items: center; font-size: 13px; }

/* slots */
.slots { display: flex; flex-direction: column; gap: 10px; }
.slot { display: flex; align-items: center; gap: 14px; padding: 12px 14px; background: var(--panel2); border: 1px solid var(--border);
  cursor: pointer; text-align: left; }
.slot:hover { border-color: var(--accent); }
.slot.empty { color: var(--muted); }
.slot .num { font-size: 26px; font-weight: 900; color: var(--accent); width: 36px; }
.slot .info { flex: 1; }
.slot .info b { display: block; font-size: 15px; }
.slot .info span { font-size: 12px; color: var(--muted); }
.slot .del { background: none; border: 1px solid var(--border); color: var(--muted); padding: 4px 8px; cursor: pointer; font-size: 11px; }
.slot .del:hover { border-color: var(--danger); color: var(--danger); }

/* settings */
.settings-list { display: flex; flex-direction: column; gap: 12px; text-align: left; }
.setting { display: flex; align-items: center; gap: 12px; padding: 10px 12px; background: var(--panel2); border: 1px solid var(--border); }
.setting label { flex: 1; font-size: 14px; }
.setting .hint { font-size: 11px; color: var(--muted); max-width: 200px; }
.toggle { width: 22px; height: 22px; accent-color: var(--accent); cursor: pointer; }
.slider { width: 200px; max-width: 45vw; accent-color: var(--accent); cursor: pointer; }

/* game */
#screen-game { background: #000; }
#game-canvas { position: absolute; left: 0; top: var(--topbar-h); width: calc(100% - var(--sidebar-w)); height: calc(100% - var(--topbar-h));
  cursor: crosshair; display: block; }
#hud { position: absolute; inset: 0; pointer-events: none; }
#topbar { position: absolute; left: 0; top: 0; right: 0; height: var(--topbar-h); background: linear-gradient(#262d37, #171c22);
  border-bottom: 2px solid var(--border); display: flex; align-items: center; gap: 18px; padding: 0 12px; pointer-events: auto; font-size: 14px; }
#topbar .spacer { flex: 1; }
.res { display: flex; align-items: center; gap: 6px; font-weight: 700; font-family: monospace; font-size: 15px; }
.ico { width: 14px; height: 14px; display: inline-block; border-radius: 3px; }
.ico.gold { background: radial-gradient(circle at 35% 35%, #ffe680, #c98a12); }
.ico.power { background: linear-gradient(#9fe0ff, #2b8fc4); clip-path: polygon(40% 0, 100% 0, 60% 45%, 90% 45%, 20% 100%, 40% 55%, 0 55%); }
.res.low { color: var(--danger); }
.res.waiting { color: #ffd34d; animation: dp-blink 1.2s ease-in-out infinite; }
@keyframes dp-blink { 50% { opacity: 0.45; } }
#sidebar { position: absolute; right: 0; top: var(--topbar-h); bottom: 0; width: var(--sidebar-w); background: var(--panel);
  border-left: 2px solid var(--border); display: flex; flex-direction: column; pointer-events: auto; }
#minimap { width: 100%; height: auto; aspect-ratio: 2 / 1; background: #07090c; border-bottom: 2px solid var(--border); cursor: pointer; }
.tabs { display: flex; }
.tab { flex: 1; background: var(--panel2); border: none; border-bottom: 2px solid var(--border); color: var(--muted); padding: 8px 0; font-size: 12px;
  letter-spacing: 1px; font-weight: 700; cursor: pointer; }
.tab.active { color: var(--accent2); background: var(--panel); border-bottom-color: var(--accent); }
#build-list { flex: 1; overflow-y: auto; padding: 6px; display: grid; grid-template-columns: 1fr 1fr; gap: 6px; align-content: start; }
.build-item { position: relative; background: var(--panel2); border: 1px solid var(--border); height: 64px; cursor: pointer; overflow: hidden;
  display: flex; flex-direction: column; justify-content: flex-end; }
.build-item:hover { border-color: var(--accent); }
.build-item.locked { opacity: 0.35; cursor: not-allowed; }
.build-item canvas { position: absolute; left: 50%; top: 3px; transform: translateX(-50%); }
.build-item .name { position: relative; font-size: 10px; text-align: center; background: rgba(0,0,0,0.6); padding: 2px 0; letter-spacing: 0.5px; }
.build-item .cost { position: absolute; top: 2px; right: 4px; font-size: 10px; color: var(--accent2); font-family: monospace; }
.build-item .progress { position: absolute; left: 0; bottom: 0; height: 100%; width: 0%; background: rgba(217,166,46,0.35); pointer-events: none; }
.build-item .progress.multi { background: rgba(217,166,46,0.42); box-shadow: inset -2px 0 0 rgba(255,214,120,0.85); }
.build-item .ready { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; font-weight: 900; color: var(--ok);
  background: rgba(0,0,0,0.5); font-size: 13px; letter-spacing: 2px; animation: blink 1s infinite; }
.build-item .hold { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; font-weight: 900; color: var(--danger);
  background: rgba(0,0,0,0.5); font-size: 12px; letter-spacing: 2px; }
.build-item .count { position: absolute; top: 2px; left: 4px; font-size: 11px; color: #fff; font-weight: 700; }
@keyframes blink { 50% { opacity: 0.5; } }
#sel-info { border-top: 2px solid var(--border); padding: 8px; font-size: 12px; min-height: 90px; }
#sel-info b { color: var(--accent2); }
#sel-info .hp { height: 6px; background: #333; margin: 4px 0; }
#sel-info .hp div { height: 100%; background: var(--ok); }
#sel-info .actions { display: flex; gap: 4px; margin-top: 6px; flex-wrap: wrap; }
#sel-info .garrison { display: grid; grid-template-columns: 1fr 1fr; gap: 3px; margin-top: 4px; }
#sel-info .gslot { position: relative; padding: 2px 4px 4px; background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.12); font-size: 11px; white-space: nowrap; overflow: hidden; }
#sel-info .gslot.empty { opacity: 0.35; min-height: 18px; }
#sel-info .gslot i { position: absolute; left: 0; bottom: 0; height: 2px; background: var(--ok); }
#sel-info .orders { display: grid; grid-template-columns: repeat(6, 1fr); gap: 3px; margin-top: 6px; }
#sel-info .orders .lbl { grid-column: 1 / -1; font-size: 10px; letter-spacing: 1px; color: var(--muted); margin-top: 3px; }
#sel-info .orders .btn { padding: 5px 2px; font-size: 10px; letter-spacing: 0.5px; white-space: nowrap; }
#sel-info .orders .btn.on { border-color: var(--accent); color: var(--accent2); background: linear-gradient(#4a3c18, #2a2210); }
#sel-info .orders .btn.off { border-color: var(--danger); color: #f0a090; }
#sel-info .orders .btn { grid-column: span 2; }
#sel-info .orders .btn.half { grid-column: span 3; }
#sel-info .orders .btn.wide { grid-column: 1 / -1; }
#sel-info .orders .btn.span2 { grid-column: span 4; }
#message-log { position: absolute; left: 10px; bottom: 10px; width: 420px; font-size: 13px; pointer-events: none; }
#message-log div { background: rgba(0,0,0,0.55); padding: 3px 8px; margin-top: 3px; border-left: 3px solid var(--accent); }
#message-log div.alert { border-left-color: var(--danger); color: #ffb3a8; }

.overlay { position: absolute; inset: 0; background: rgba(0,0,0,0.6); pointer-events: auto; z-index: 20; }
.overlay .menu-panel { margin-top: 20vh; }
.overlay p { color: var(--muted); margin-bottom: 20px; }

#toast { position: fixed; left: 50%; top: 14px; transform: translateX(-50%); background: var(--panel2); border: 1px solid var(--accent);
  padding: 8px 16px; z-index: 100; font-size: 13px; }

@media (max-width: 700px) {
  .title { font-size: 40px; }
  :root { --sidebar-w: 160px; }
}

.credits { max-height: 40vh; overflow: auto; white-space: pre-wrap; font-size: 11px; line-height: 1.45; color: var(--muted); background: var(--panel2); border: 1px solid var(--border); padding: 10px 12px; margin: 0; text-align: left; }
.credits.hidden { display: none; }
.menu-panel.wide { max-height: 94vh; overflow-y: auto; }

/* ---------- tech tree ---------- */
.tech-btn.glow { border-color: var(--accent); color: var(--accent); box-shadow: 0 0 10px rgba(242, 182, 50, 0.55); animation: techpulse 1.6s ease-in-out infinite; }
@keyframes techpulse { 50% { box-shadow: 0 0 2px rgba(242, 182, 50, 0.2); } }
.tech-panel { width: min(1240px, 96vw); max-width: 96vw; max-height: 94vh; display: flex; flex-direction: column; }
.tech-sub { color: var(--muted); font-size: 13px; margin: -6px 0 12px; }
.tech-sub b { color: var(--accent); }
.tech-scroll { overflow: auto; flex: 1; min-height: 0; padding-bottom: 8px; }
.tech-tabs { display: flex; flex-wrap: wrap; gap: 4px; justify-content: center; margin-bottom: 14px; }
.tech-tab { background: var(--panel2); color: var(--muted); border: 1px solid var(--border); padding: 7px 12px; font: inherit; font-size: 12px; letter-spacing: 1.5px; cursor: pointer; }
.tech-tab:hover { color: var(--text); border-color: var(--accent); }
.tech-tab.active { color: var(--accent2); border-color: var(--accent); background: linear-gradient(#3a3018, var(--panel2)); }
.tech-tab.buy { box-shadow: inset 0 -2px 0 var(--accent); }
.tech-area { position: relative; margin: 0 auto; }
.tech-area.tight .tech-node { height: var(--node-h, 112px); padding: 4px 8px; }
.tech-area.tight .tech-node .tech-icon { height: 26px !important; }
.tech-area.tight .tech-desc { font-size: 10px; line-height: 1.22; }
#tech-tree { position: relative; margin: 0 auto; }
.tech-lines { position: absolute; left: 0; top: 0; pointer-events: none; }
.tech-lines path { fill: none; stroke: #4a4f57; stroke-width: 3; }
.tech-lines path.on { stroke: #6fbf4a; }
.tech-branch { position: absolute; top: 0; text-align: center; font-size: 12px; letter-spacing: 3px; color: var(--muted); border-bottom: 1px solid var(--border); padding-bottom: 6px; }
.tech-node { position: absolute; box-sizing: border-box; height: 112px; padding: 6px 8px; background: var(--panel2); border: 1px solid var(--border); text-align: center; cursor: pointer; transition: transform .1s, border-color .1s; overflow: hidden; }
.tech-node:hover { transform: translateY(-2px); }
.tech-node .tech-icon { display: block; margin: 0 auto 1px; height: 32px !important; width: auto !important; }
.tech-node .tech-icon.upgrade { font-size: 20px; line-height: 32px; height: 32px; color: #8fd16a; }
.tech-name { font-weight: 700; font-size: 12px; letter-spacing: 0.5px; color: var(--text); }
.tech-desc { font-size: 10.5px; line-height: 1.3; color: var(--muted); margin-top: 2px; }
.tech-cost { position: absolute; right: 7px; top: 5px; font-size: 11px; font-weight: 700; color: var(--accent); letter-spacing: 1px; }
.tech-node.owned { border-color: #6fbf4a; background: linear-gradient(#24351f, var(--panel2)); cursor: default; }
.tech-node.owned .tech-cost { color: #8fd16a; }
.tech-node.available { border-color: var(--accent); box-shadow: 0 0 12px rgba(242, 182, 50, 0.35); }
.tech-node.pricey { opacity: 0.85; }
.tech-node.pricey .tech-cost { color: #c76b5a; }
.tech-node.locked { opacity: 0.45; cursor: not-allowed; }
.build-item.techlock canvas { filter: grayscale(1) brightness(0.6); }
.build-item .aatag { position: absolute; left: 3px; bottom: 19px; font-size: 9px; font-weight: 800; letter-spacing: 0.5px; color: #fff; background: #2d78b8; border: 1px solid #8fd0ff; padding: 0 3px; line-height: 12px; pointer-events: none; }
.build-item .aatag.only { background: #1d5f9a; color: #cdeaff; }
#sel-info .targets { color: #b8ab98; }
#sel-info .targets.aa { color: #8fd0ff; font-weight: 700; }
.build-item .techtag { position: absolute; top: 3px; left: 3px; font-size: 9px; font-weight: 700; letter-spacing: 1px; color: var(--accent); background: rgba(0,0,0,0.65); padding: 1px 4px; }
/* air strike button */
.power-btn { position: relative; display: block; width: calc(100% - 12px); margin: 6px 6px 0; height: 30px; border: 1px solid var(--border); background: var(--panel2); color: var(--muted); font-weight: 700; letter-spacing: 2px; font-size: 12px; overflow: hidden; }
.power-btn .fill { position: absolute; left: 0; top: 0; bottom: 0; width: 0; background: rgba(217, 72, 59, 0.35); }
.power-btn .label { position: relative; }
.power-btn.ready { color: #fff; border-color: #e0483b; box-shadow: 0 0 10px rgba(224, 72, 59, 0.6); }
.power-btn.ready .fill { background: rgba(217, 72, 59, 0.6); }
.power-btn.aiming { animation: techpulse 0.8s ease-in-out infinite; }
.overlay .menu-panel.tech-panel { margin: 3vh auto 0; padding: 20px 22px; max-height: 94vh; box-sizing: border-box; }
.tech-panel h2 { margin-bottom: 10px; }

/* repair / sell */
.mode-btns { display: flex; gap: 6px; margin: 6px 6px 0; }
.mode-btn { flex: 1; display: flex; align-items: center; justify-content: center; gap: 4px; height: 28px; border: 1px solid var(--border); background: var(--panel2); color: var(--muted); font-weight: 700; letter-spacing: 1.5px; font-size: 11px; }
.mode-btn .mode-ico { width: 20px; height: 20px; }
.mode-btn:hover { color: var(--text); }
.mode-btn.active { color: #fff; border-color: var(--accent); box-shadow: 0 0 8px rgba(242, 182, 50, 0.5); }

.select { background: var(--panel2); color: var(--text); border: 1px solid var(--border); padding: 6px 8px; font: inherit; font-size: 13px; max-width: 60%; }
#perf-hud { position: fixed; left: 8px; top: calc(var(--topbar-h) + 8px); z-index: 30; pointer-events: none; background: rgba(8,10,14,0.78);
  border: 1px solid var(--border); color: #cfe7c0; font: 12px/1.45 Consolas, "Courier New", monospace; padding: 6px 9px; white-space: pre; }
#perf-hud.bad { color: #ffb0a0; }
/* Mars key art fills the right side of the main menu on wide screens */
@media (min-width: 1100px) { #screen-menu .menu-panel { margin-left: 6vw; margin-top: 12vh; } }
.menu-panel { backdrop-filter: none; }

/* tech tree: your tech / alien hive switch */
.tech-side { display: flex; justify-content: center; gap: 0; margin: -2px 0 10px; }
.tech-side-btn { background: var(--panel2); color: var(--muted); border: 1px solid var(--border); padding: 7px 18px; font: inherit; font-size: 12px; font-weight: 700; letter-spacing: 2px; cursor: pointer; }
.tech-side-btn + .tech-side-btn { border-left: 0; }
.tech-side-btn.active { color: var(--accent2); border-color: var(--accent); background: linear-gradient(#3a3018, var(--panel2)); }
.tech-side-btn[data-side="alien"].active { color: #b6ff6a; border-color: #6fbf4a; background: linear-gradient(#1f3318, var(--panel2)); }
.tech-area.alien .tech-node { cursor: default; }
.tech-area.alien .tech-node:hover { transform: none; }
.tech-area.alien .tech-node.owned { border-color: #c8402f; background: linear-gradient(#3a1d18, var(--panel2)); }
.tech-area.alien .tech-node.owned .tech-cost { color: #ff8a70; }
.tech-area.alien .tech-node.pricey { opacity: 0.75; }
.tech-area.alien .tech-lines path.on { stroke: #c8402f; }
.tech-tab.alien.active { color: #ff9a80; border-color: #c8402f; background: linear-gradient(#3a1d18, var(--panel2)); }

/* square picker */
.overlay .menu-panel.sector-panel { margin: 4vh auto 0; width: min(1220px, 96vw); max-width: 96vw; padding: 20px 22px; box-sizing: border-box; }
.sector-body { display: flex; gap: 16px; align-items: stretch; }
#sector-map { flex: 0 1 840px; width: 100%; max-width: 840px; height: auto; aspect-ratio: 840 / 500; background: #0b0908; border: 1px solid var(--border); }
.sector-side { flex: 1; min-width: 220px; display: flex; flex-direction: column; justify-content: space-between; gap: 12px; text-align: left; }
#sector-info h3 { margin: 0 0 8px; color: var(--accent2); font-size: 16px; letter-spacing: 1px; }
#sector-info p { margin: 0 0 10px; font-size: 13px; line-height: 1.4; }
#sector-info .sector-warn { color: #ff9a80; }
.sector-list { margin: 0 0 12px; padding-left: 18px; font-size: 13px; line-height: 1.55; color: var(--text); }
#btn-sector-go:disabled { opacity: 0.5; cursor: default; }
@media (max-width: 760px) { .sector-body { flex-direction: column; } }

/* repair bay: auto repair setting */
#sel-info .orders.autorep { grid-template-columns: 32px 1fr 32px; }
#sel-info .orders.autorep .lbl, #sel-info .orders.autorep .btn.wide { grid-column: 1 / -1; }
#sel-info .orders.autorep .btn.step { grid-column: auto; padding: 0; font-size: 16px; }
#sel-info .autorep-pct { align-self: center; text-align: center; font-weight: 700; letter-spacing: 1px; font-size: 12px; color: var(--accent2); }

/* ---------- co-op ---------- */
.coop-info { color: var(--muted, #9aa4b0); font-size: 13px; line-height: 1.5; margin: 0 0 16px; }
.coop-cols { display: flex; gap: 14px; flex-wrap: wrap; }
.coop-box { flex: 1 1 240px; padding: 14px 16px; background: var(--panel2); border: 1px solid var(--border); border-radius: 6px; }
.coop-box h3 { margin: 0 0 6px; letter-spacing: 3px; font-size: 14px; color: var(--accent2); }
.coop-box p { margin: 0 0 12px; font-size: 12px; color: var(--muted, #9aa4b0); }
.coop-join { display: flex; gap: 8px; }
.coop-join input { flex: 1; min-width: 0; padding: 8px 10px; font: 700 18px/1 monospace; letter-spacing: 4px; text-transform: uppercase; color: var(--text); background: #0c0f13; border: 1px solid var(--border); border-radius: 4px; user-select: text; -webkit-user-select: text; }
.coop-status { min-height: 18px; margin: 14px 0 0; font-size: 13px; color: var(--accent2); }
.coop-status.err { color: #ff7a6a; }
.coop-code { margin: 8px 0 18px; text-align: center; font: 700 52px/1.1 monospace; letter-spacing: 12px; color: #2fd6c8; user-select: all; }
.slot .tag { margin-left: 8px; padding: 1px 6px; font-size: 10px; letter-spacing: 1px; border-radius: 3px; background: #1f5f5a; color: #bff7f1; vertical-align: middle; }
/* formation buttons (v1.20.0): dot pictures of the shape, forward = up */
#sel-info .orders .forms { grid-column: 1 / -1; display: grid; grid-template-columns: repeat(5, 1fr); gap: 3px; }
#sel-info .orders .forms .btn.form { grid-column: auto; padding: 3px 0 2px; display: flex; flex-direction: column; align-items: center; gap: 1px; font-size: 8px; letter-spacing: 0; }
#sel-info .orders .forms .btn.form svg { width: 22px; height: 16px; fill: currentColor; }