/* KESTREL SAR — dawn mountain mission space */
:root {
  --ceramic: #e9e7e1;
  --graphite: #20242a;
  --rock: #6a6f72;
  --mist: #93a3b3;
  --sand: #c9b98f;
  --orange: #e4622a;
  --ink: #f3f1ec;
  --ink-dim: rgba(243, 241, 236, 0.62);
  --panel: rgba(28, 32, 38, 0.72);
  --line: rgba(233, 231, 225, 0.14);
  --line-strong: rgba(233, 231, 225, 0.28);
  --bg-0: #161a20;
  --bg-1: #1d232b;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg-0);
  color: var(--ink);
  font-family: "Manrope", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, sans-serif;
  font-weight: 400;
  font-size: 15px;
  line-height: 1.5;
  min-height: 100vh;
  overflow-x: hidden;
}

.app {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 296px;
  grid-template-areas:
    "topbar topbar"
    "stage sidebar"
    "modules modules";
  min-height: 100vh;
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 28px 34px;
}

/* ---------- top bar ---------- */
.topbar {
  grid-area: topbar;
  display: flex;
  align-items: center;
  gap: 26px;
  padding: 16px 0 12px;
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  width: 30px; height: 30px; flex: none;
  border: 1px solid var(--orange);
  border-radius: 2px;
  background:
    linear-gradient(135deg, transparent 46%, var(--orange) 46%, var(--orange) 54%, transparent 54%),
    linear-gradient(45deg, transparent 46%, rgba(228,98,42,0.35) 46%, rgba(228,98,42,0.35) 54%, transparent 54%);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name { font-weight: 600; letter-spacing: 0.12em; font-size: 14px; }
.brand-sub { font-size: 11px; color: var(--ink-dim); letter-spacing: 0.02em; }
.coords {
  margin-left: auto;
  font-size: 11px;
  color: var(--mist);
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
}
.lang { display: flex; gap: 6px; }
.lang-btn {
  appearance: none;
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--ink-dim);
  font: inherit;
  font-size: 12px;
  padding: 5px 12px;
  border-radius: 999px;
  cursor: pointer;
  transition: color .18s, border-color .18s, background .18s;
}
.lang-btn:hover { color: var(--ink); border-color: var(--ink-dim); }
.lang-btn.is-active { background: var(--orange); border-color: var(--orange); color: #fff; }

/* ---------- stage ---------- */
.stage {
  grid-area: stage;
  position: relative;
  min-height: 560px;
  padding: 18px 0 0;
}
.hero-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px;
  padding: 6px 4px 10px 2px;
}
.title {
  margin: 0;
  font-size: clamp(26px, 3vw, 40px);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.1;
}
.subtitle { margin: 6px 0 0; color: var(--ink-dim); font-size: 14px; }
.hero-tag {
  font-size: 12px;
  color: var(--sand);
  border: 1px solid rgba(201,185,143,0.4);
  padding: 4px 12px;
  border-radius: 2px;
  white-space: nowrap;
  letter-spacing: 0.05em;
}

.canvas-host {
  position: relative;
  width: 100%;
  height: clamp(380px, 64vh, 720px);
  border: 1px solid var(--line);
  border-radius: 3px;
  overflow: hidden;
  background: linear-gradient(180deg, #242b34 0%, #1a1f26 58%, #15191f 100%);
  cursor: grab;
}
.canvas-host:active { cursor: grabbing; }
.canvas-host canvas { display: block; width: 100% !important; height: 100% !important; }

/* corner registration marks — instrument framing */
.canvas-host::before,
.canvas-host::after {
  content: "";
  position: absolute;
  width: 14px; height: 14px;
  border-color: rgba(233,231,225,0.35);
  border-style: solid;
  pointer-events: none;
  z-index: 2;
}
.canvas-host::before { top: 10px; left: 10px; border-width: 1px 0 0 1px; }
.canvas-host::after { bottom: 10px; right: 10px; border-width: 0 1px 1px 0; }

.hud {
  position: absolute;
  left: 18px; bottom: 16px;
  display: flex;
  gap: 22px;
  z-index: 3;
  pointer-events: none;
}
.hud-item { display: flex; flex-direction: column; gap: 2px; }
.hud-label { font-size: 10px; color: var(--ink-dim); letter-spacing: 0.08em; }
.hud-value { font-size: 17px; font-weight: 600; color: var(--ink); font-variant-numeric: tabular-nums; }
.hud-value small { font-size: 11px; font-weight: 400; color: var(--mist); margin-left: 3px; }
.hud-item + .hud-item { border-left: 1px solid var(--line); padding-left: 22px; }

.controls {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  padding: 14px 2px 0;
}
.btn {
  appearance: none;
  font: inherit;
  font-size: 13px;
  font-weight: 600;
  padding: 10px 20px;
  border-radius: 2px;
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  transition: background .2s, border-color .2s, color .2s;
}
.btn:hover { border-color: var(--ink-dim); background: rgba(255,255,255,0.05); }
.btn-primary { background: var(--orange); border-color: var(--orange); color: #fff; }
.btn-primary:hover { background: #cf5623; border-color: #cf5623; }
.btn-primary[aria-pressed="true"] { background: transparent; color: var(--orange); border-color: var(--orange); }
.btn-icon {
  width: 12px; height: 12px; flex: none;
  background:
    linear-gradient(var(--orange-current, #fff), var(--orange-current, #fff)) center/2px 100% no-repeat,
    linear-gradient(var(--orange-current, #fff), var(--orange-current, #fff)) center/100% 2px no-repeat;
  --orange-current: #fff;
}
.btn-primary[aria-pressed="true"] .btn-icon { --orange-current: var(--orange); }
.state-chip {
  font-size: 12px;
  color: var(--ink-dim);
  border: 1px dashed var(--line-strong);
  padding: 7px 14px;
  border-radius: 999px;
  letter-spacing: 0.04em;
}
.state-chip.is-exploded { color: var(--sand); border-color: rgba(201,185,143,0.5); border-style: solid; }

/* ---------- sidebar ---------- */
.sidebar {
  grid-area: sidebar;
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 18px 0 0 26px;
}
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 16px 18px;
}
.panel-title {
  margin: 0 0 12px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--sand);
}
.spec { margin: 0; display: flex; flex-direction: column; gap: 10px; }
.spec div { display: grid; grid-template-columns: 76px 1fr; gap: 10px; }
.spec dt { font-size: 12px; color: var(--ink-dim); }
.spec dd { margin: 0; font-size: 13px; }
.ops { margin: 0; padding: 0; list-style: none; display: flex; flex-direction: column; gap: 9px; }
.ops li {
  font-size: 13px;
  color: var(--ink-dim);
  padding-left: 14px;
  position: relative;
}
.ops li::before {
  content: "";
  position: absolute; left: 0; top: 8px;
  width: 6px; height: 1px; background: var(--orange);
}
.panel-note p { margin: 0; font-size: 12px; color: var(--ink-dim); }

/* ---------- bottom module strip ---------- */
.modules {
  grid-area: modules;
  margin-top: 26px;
  border-top: 1px solid var(--line);
  padding: 18px 2px 0;
}
.modules-title {
  margin: 0 0 14px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--mist);
}
.module-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.module-list li {
  background: var(--bg-1);
  padding: 14px 14px 16px;
  display: flex;
  gap: 10px;
  align-items: flex-start;
}
.module-list .mod-no {
  font-size: 10px;
  font-weight: 600;
  color: var(--orange);
  letter-spacing: 0.08em;
  font-variant-numeric: tabular-nums;
}
.module-list h3 { margin: 0 0 4px; font-size: 13px; font-weight: 600; }
.module-list p { margin: 0; font-size: 11px; color: var(--ink-dim); line-height: 1.45; }

/* ---------- part legend (visible while exploded) ---------- */
.legend, .legend-items {
  grid-column: 1 / -1;
}
.legend {
  margin: 22px 0 -8px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--sand);
}
.legend-items {
  display: none;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 8px;
  margin-top: 10px;
}
.legend-items.is-visible { display: grid; }
.legend-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  color: var(--ink-dim);
  border: 1px solid var(--line);
  border-radius: 2px;
  padding: 8px 12px;
  background: rgba(29,35,43,0.6);
}
.legend-item b { font-weight: 600; color: var(--ink); font-size: 12px; }
.legend-dot { width: 9px; height: 9px; flex: none; border-radius: 50%; }

/* ---------- responsive ---------- */
@media (max-width: 1080px) {
  .app {
    grid-template-columns: 1fr;
    grid-template-areas:
      "topbar"
      "stage"
      "sidebar"
      "modules";
    padding: 0 16px 26px;
  }
  .sidebar { flex-direction: row; flex-wrap: wrap; padding: 16px 0 0; }
  .panel { flex: 1 1 240px; }
  .module-list { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .canvas-host { height: 52vh; min-height: 340px; }
  .coords { display: none; }
}
@media (max-width: 640px) {
  .app { padding: 0 12px 22px; }
  .hero-head { flex-direction: column; align-items: flex-start; gap: 8px; }
  .title { font-size: 24px; }
  .canvas-host { height: 46vh; min-height: 300px; }
  .hud { gap: 14px; left: 12px; bottom: 10px; }
  .hud-item + .hud-item { padding-left: 14px; }
  .hud-value { font-size: 14px; }
  .controls { padding-top: 10px; }
  .btn { padding: 9px 14px; font-size: 12px; }
  .module-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .sidebar { flex-direction: column; }
  .brand-sub { display: none; }
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  * { transition-duration: 0.01ms !important; }
}