:root {
  --bg: #0f1319;
  --bg-soft: #141a22;
  --panel: #171e27;
  --panel-raised: #1d2632;
  --border: #2a3441;
  --border-soft: #222b37;
  --text: #e6ebf2;
  --muted: #93a1b4;
  --accent: #7bd88f;
  --accent-strong: #a2e9b1;
  --accent-ink: #0d1a10;
  --danger: #ff8080;
  --radius: 14px;
  --shadow: 0 18px 40px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  background:
    radial-gradient(1100px 600px at 15% -10%, rgba(123, 216, 143, 0.12), transparent 60%),
    radial-gradient(900px 500px at 100% 0%, rgba(107, 142, 255, 0.08), transparent 55%),
    var(--bg);
  color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.45;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

h1,
h2,
p {
  margin: 0;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  width: min(980px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 18px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: linear-gradient(150deg, var(--accent), #4fae70);
  color: var(--accent-ink);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.brand__title {
  font-size: 22px;
  font-weight: 650;
  letter-spacing: 0.01em;
}

.brand__subtitle {
  color: var(--muted);
  font-size: 13px;
}

.connection {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 13px;
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(23, 30, 39, 0.7);
}

.connection::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--muted);
}

.connection[data-state="online"]::before {
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(123, 216, 143, 0.15);
}

.connection[data-state="offline"] {
  color: var(--danger);
  border-color: rgba(255, 128, 128, 0.35);
}

.connection[data-state="offline"]::before {
  background: var(--danger);
}

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
  gap: 18px;
  width: min(980px, calc(100% - 32px));
  margin: 0 auto;
  flex: 1;
  align-content: start;
}

.panel {
  background: linear-gradient(180deg, var(--panel-raised), var(--panel));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
}

.panel__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.panel__title {
  font-size: 15px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.panel__hint {
  font-size: 12px;
  color: var(--muted);
  opacity: 0.8;
}

.resources {
  display: grid;
  gap: 10px;
}

.resource {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-areas:
    "name amount"
    "rate amount";
  align-items: center;
  gap: 2px 12px;
  padding: 12px 14px;
  background: var(--bg-soft);
  border: 1px solid var(--border-soft);
  border-radius: 11px;
}

.resource__name {
  grid-area: name;
  color: var(--muted);
  font-size: 13px;
  text-transform: capitalize;
}

.resource__amount {
  grid-area: amount;
  font-size: 26px;
  font-weight: 650;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.resource__rate {
  grid-area: rate;
  color: var(--accent);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}

.buildings {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.building {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-areas:
    "info button"
    "cost button";
  align-items: center;
  gap: 4px 14px;
  padding: 13px 14px;
  background: var(--bg-soft);
  border: 1px solid var(--border-soft);
  border-radius: 11px;
}

.building__info {
  grid-area: info;
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}

.building__name {
  font-weight: 600;
  font-size: 15px;
}

.building__owned {
  color: var(--muted);
  font-size: 12px;
}

.building__production {
  color: var(--accent);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}

.building__cost {
  grid-area: cost;
  color: var(--muted);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}

.building__cost strong {
  color: var(--text);
  font-weight: 600;
}

.building__button {
  grid-area: button;
}

.button {
  appearance: none;
  border: 1px solid transparent;
  border-radius: 10px;
  padding: 9px 16px;
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  background: var(--panel-raised);
  border-color: var(--border);
  cursor: pointer;
  transition:
    background-color 120ms ease,
    border-color 120ms ease,
    transform 120ms ease;
}

.button:hover:not(:disabled) {
  border-color: var(--accent);
}

.button:active:not(:disabled) {
  transform: translateY(1px);
}

.button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.button--primary {
  background: linear-gradient(160deg, var(--accent-strong), var(--accent));
  border-color: transparent;
  color: var(--accent-ink);
  padding: 11px 24px;
}

.button--primary:hover:not(:disabled) {
  filter: brightness(1.05);
}

.footer {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  width: min(980px, calc(100% - 32px));
  margin: 18px auto 26px;
}

.footer__hint {
  color: var(--muted);
  font-size: 12px;
}

.placeholder {
  color: var(--muted);
  font-size: 14px;
  padding: 10px 2px;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translate(-50%, 8px);
  max-width: min(520px, calc(100% - 32px));
  padding: 11px 16px;
  border-radius: 10px;
  background: #2a1d1f;
  border: 1px solid rgba(255, 128, 128, 0.4);
  color: #ffd9d9;
  font-size: 13px;
  box-shadow: var(--shadow);
  opacity: 0;
  transition:
    opacity 160ms ease,
    transform 160ms ease;
}

.toast[data-visible="true"] {
  opacity: 1;
  transform: translate(-50%, 0);
}

@media (max-width: 820px) {
  .layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .topbar {
    padding-top: 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
  }
}