/* Upgrade system: the space popup, the nudge dock and the sidebar fuel gauge.
   Strict palette: black, #217cff, white. */

/* ---------- Popup ---------- */
.upg-backdrop {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: grid;
  place-items: center;
  padding: 16px;
  overflow: auto;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(6px);
  animation: upg-fade 0.25s ease both;
}

.upg {
  position: relative;
  width: min(540px, 100%);
  max-height: calc(100vh - 32px);
  overflow: auto;
  display: grid;
  gap: 18px;
  padding: 0 22px 20px;
  background: var(--black);
  border-color: var(--blue-35);
  box-shadow: var(--glow-lg), 0 0 0 1px var(--blue-10) inset;
  animation: upg-rise 0.45s cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

.upg:focus {
  outline: none;
}

.upg-wide {
  width: min(800px, 100%);
}

.upg-close {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 3;
  background: rgba(0, 0, 0, 0.5);
}

.upg-head {
  display: grid;
  gap: 8px;
  text-align: center;
  justify-items: center;
}

.upg-head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4vw, 2.1rem);
  line-height: 1.1;
  margin: 0;
}

.upg-head > p.muted {
  max-width: 52ch;
  margin: 0;
}

/* Scene: drifting stars and a ringed planet */
.upg-scene {
  position: relative;
  height: 190px;
  margin: 0 -22px;
  overflow: hidden;
  background:
    radial-gradient(60% 90% at 50% 100%, var(--blue-20), transparent 70%),
    radial-gradient(40% 60% at 50% 60%, var(--blue-10), transparent 70%),
    var(--black);
  border-bottom: 1px solid var(--line);
  mask-image: linear-gradient(to bottom, #000 70%, transparent);
}

.upg-stars {
  position: absolute;
  inset: -50% 0 0;
  background-repeat: repeat;
  animation: upg-drift linear infinite;
}

.upg-stars.l1 {
  background-image:
    radial-gradient(1px 1px at 12px 18px, rgba(255, 255, 255, 0.7), transparent),
    radial-gradient(1px 1px at 70px 90px, rgba(255, 255, 255, 0.5), transparent),
    radial-gradient(1px 1px at 130px 40px, rgba(255, 255, 255, 0.6), transparent);
  background-size: 160px 120px;
  animation-duration: 40s;
}

.upg-stars.l2 {
  background-image:
    radial-gradient(1.5px 1.5px at 40px 60px, rgba(255, 255, 255, 0.85), transparent),
    radial-gradient(1.5px 1.5px at 190px 20px, rgba(33, 124, 255, 0.9), transparent);
  background-size: 240px 150px;
  animation-duration: 24s;
}

.upg-stars.l3 {
  background-image:
    radial-gradient(2px 2px at 80px 30px, #fff, transparent),
    radial-gradient(2px 2px at 260px 110px, rgba(33, 124, 255, 1), transparent);
  background-size: 340px 180px;
  animation-duration: 14s;
}

.upg-planet-wrap {
  position: absolute;
  left: 50%;
  top: 54%;
  width: 170px;
  height: 170px;
  transform: translate(-50%, -50%);
}

.upg-planet {
  width: 100%;
  height: 100%;
  filter: drop-shadow(0 0 24px var(--blue-35));
  animation: upg-bob 6s ease-in-out infinite;
}

.upg-ring {
  fill: none;
  stroke: rgba(255, 255, 255, 0.55);
  stroke-width: 1.5;
}

.upg-ring.back {
  stroke: rgba(255, 255, 255, 0.2);
}

.upg-crater {
  fill: rgba(0, 0, 0, 0.35);
  stroke: rgba(255, 255, 255, 0.15);
}

/* Explore: warp streaks racing past */
.upg-warp span {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 90px;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.8));
  transform-origin: 0 50%;
  opacity: 0;
  animation: upg-warp 2.6s ease-in infinite;
}

.upg-warp span:nth-child(odd) {
  background: linear-gradient(90deg, transparent, var(--blue));
}

.upg-warp span:nth-child(1) { --a: 8deg; animation-delay: 0s; }
.upg-warp span:nth-child(2) { --a: 34deg; animation-delay: 0.3s; }
.upg-warp span:nth-child(3) { --a: 61deg; animation-delay: 1.1s; }
.upg-warp span:nth-child(4) { --a: 97deg; animation-delay: 0.7s; }
.upg-warp span:nth-child(5) { --a: 128deg; animation-delay: 1.6s; }
.upg-warp span:nth-child(6) { --a: 152deg; animation-delay: 0.2s; }
.upg-warp span:nth-child(7) { --a: 181deg; animation-delay: 1.3s; }
.upg-warp span:nth-child(8) { --a: 206deg; animation-delay: 0.5s; }
.upg-warp span:nth-child(9) { --a: 233deg; animation-delay: 1.9s; }
.upg-warp span:nth-child(10) { --a: 262deg; animation-delay: 0.9s; }
.upg-warp span:nth-child(11) { --a: 289deg; animation-delay: 2.2s; }
.upg-warp span:nth-child(12) { --a: 312deg; animation-delay: 0.4s; }
.upg-warp span:nth-child(13) { --a: 337deg; animation-delay: 1.4s; }
.upg-warp span:nth-child(14) { --a: 355deg; animation-delay: 2s; }

/* Limit: the planet dims */
.upg-limit .upg-planet {
  filter: drop-shadow(0 0 10px var(--blue-20)) saturate(0.6);
}

/* Welcome: a burst of sparkles */
.upg-burst span {
  position: absolute;
  top: 54%;
  left: 50%;
  width: 6px;
  height: 6px;
  margin: -3px;
  border-radius: 50%;
  background: var(--white);
  box-shadow: 0 0 10px var(--blue);
  animation: upg-burst 1.6s cubic-bezier(0.1, 0.7, 0.2, 1) both;
}

.upg-burst span:nth-child(3n) {
  background: var(--blue);
}

.upg-burst span:nth-child(1) { --a: 0deg; }
.upg-burst span:nth-child(2) { --a: 22deg; animation-delay: 0.05s; }
.upg-burst span:nth-child(3) { --a: 45deg; }
.upg-burst span:nth-child(4) { --a: 67deg; animation-delay: 0.1s; }
.upg-burst span:nth-child(5) { --a: 90deg; }
.upg-burst span:nth-child(6) { --a: 112deg; animation-delay: 0.05s; }
.upg-burst span:nth-child(7) { --a: 135deg; }
.upg-burst span:nth-child(8) { --a: 157deg; animation-delay: 0.1s; }
.upg-burst span:nth-child(9) { --a: 180deg; }
.upg-burst span:nth-child(10) { --a: 202deg; animation-delay: 0.05s; }
.upg-burst span:nth-child(11) { --a: 225deg; }
.upg-burst span:nth-child(12) { --a: 247deg; animation-delay: 0.1s; }
.upg-burst span:nth-child(13) { --a: 270deg; }
.upg-burst span:nth-child(14) { --a: 292deg; animation-delay: 0.05s; }
.upg-burst span:nth-child(15) { --a: 315deg; }
.upg-burst span:nth-child(16) { --a: 337deg; animation-delay: 0.1s; }

/* Fuel meter (limit mode) */
.upg-fuel {
  width: min(360px, 100%);
  display: grid;
  gap: 6px;
  margin-top: 6px;
  text-align: left;
}

.upg-fuel p {
  margin: 0;
}

.upg-empty {
  color: var(--blue);
  animation: upg-blink 1.2s steps(2, jump-none) infinite;
}

.upg-fuel-track {
  height: 8px;
  border-radius: 999px;
  background: var(--surface-2);
  overflow: hidden;
}

.upg-fuel-fill {
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--blue-60), var(--blue));
  box-shadow: var(--glow-sm);
}

/* Plans */
.upg-cycle {
  display: flex;
  justify-content: center;
}

.upg-plans {
  display: grid;
  gap: 14px;
}

@media (min-width: 640px) {
  .upg-plans {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  }
}

.upg-plan {
  position: relative;
  display: grid;
  align-content: start;
  gap: 6px;
  padding: 18px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--surface);
}

.upg-plan.pick {
  border-color: var(--blue);
  background: linear-gradient(180deg, var(--blue-10), transparent 60%);
  box-shadow: var(--glow-md);
}

.upg-plan h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.25rem;
}

.upg-plan p {
  margin: 0;
}

.upg-flag {
  position: absolute;
  top: -11px;
  right: 14px;
  background: var(--blue);
  border-color: var(--blue);
}

.upg-price {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-top: 6px !important;
}

.upg-price .tier-amount {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 600;
}

.upg-boosts {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 8px 0 12px;
  padding: 0;
  list-style: none;
}

.upg-boosts li {
  padding: 3px 9px;
  border: 1px solid var(--blue-35);
  border-radius: 999px;
  background: var(--blue-05);
  font-size: 0.72rem;
}

.upg-cta {
  width: 100%;
  justify-content: center;
  margin-top: auto;
}

.upg-features {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.upg-features li {
  display: flex;
  gap: 10px;
  align-items: center;
}

.upg-features .icon {
  color: var(--blue);
  flex: none;
}

.upg-foot {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.upg-foot .row {
  gap: 16px;
}

.upg-foot a {
  color: var(--white);
}

/* ---------- Nudge dock ---------- */
.nudge {
  position: fixed;
  right: 16px;
  bottom: 16px;
  left: 16px;
  z-index: 40;
  display: flex;
  gap: 12px;
  padding: 14px 36px 14px 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: rgba(0, 0, 0, 0.92);
  backdrop-filter: blur(10px);
  box-shadow: var(--glow-lg);
  animation: nudge-in 0.5s cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

@media (min-width: 640px) {
  .nudge {
    left: auto;
    width: 360px;
    right: 24px;
    bottom: 24px;
  }
}

.nudge-limit,
.nudge-upgrade {
  border-color: var(--blue-60);
}

.nudge-icon {
  flex: none;
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--blue-35);
  background: var(--blue-10);
  color: var(--white);
}

.nudge-limit .nudge-icon {
  background: var(--blue);
  box-shadow: var(--glow-sm);
  animation: pulse-ring 2s ease-out infinite;
}

.nudge-body {
  display: grid;
  gap: 6px;
  min-width: 0;
}

.nudge-body h3 {
  margin: 0;
  font-size: 1rem;
}

.nudge-body p {
  margin: 0;
}

.nudge-body .eyebrow {
  font-size: 0.65rem;
}

.nudge-body .row {
  margin-top: 4px;
  gap: 14px;
}

.nudge-close {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 26px;
  height: 26px;
}

/* ---------- Sidebar fuel gauge ---------- */
.fuel,
.fuel-mini {
  display: none;
}

@media (min-width: 900px) {
  .fuel {
    display: grid;
    gap: 8px;
    margin-top: auto;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface);
  }

  .fuel + .sidebar-user {
    margin-top: 0;
  }

  .fuel.low {
    border-color: var(--blue-35);
    box-shadow: var(--glow-sm);
  }

  .fuel-warn {
    color: var(--blue);
  }

  .fuel-row {
    display: grid;
    gap: 4px;
    font-size: 0.7rem;
    color: var(--text-2);
  }

  .fuel-track {
    height: 4px;
    border-radius: 999px;
    background: var(--surface-2);
    overflow: hidden;
  }

  .fuel-fill {
    height: 100%;
    border-radius: inherit;
    background: var(--blue-60);
  }

  .fuel-fill.hot {
    background: var(--blue);
    box-shadow: var(--glow-sm);
  }

  .fuel-cta {
    width: 100%;
    justify-content: center;
    gap: 6px;
    margin-top: 4px;
  }

  .shell.collapsed .fuel {
    display: none;
  }

  .shell.collapsed .fuel-mini {
    display: inline-grid;
    margin-top: auto;
    color: var(--white);
    border-color: var(--blue-35);
  }

  .fuel-mini.low {
    background: var(--blue);
    box-shadow: var(--glow-sm);
  }
}

/* ---------- Motion ---------- */
@keyframes upg-fade {
  from { opacity: 0; }
}

@keyframes upg-rise {
  from { opacity: 0; transform: translateY(24px) scale(0.97); }
}

@keyframes upg-drift {
  to { transform: translateY(50%); }
}

@keyframes upg-bob {
  50% { transform: translateY(-5px); }
}

@keyframes upg-warp {
  0% { opacity: 0; transform: rotate(var(--a)) translateX(10px) scaleX(0.2); }
  30% { opacity: 1; }
  100% { opacity: 0; transform: rotate(var(--a)) translateX(360px) scaleX(1.4); }
}

@keyframes upg-burst {
  0% { opacity: 1; transform: rotate(var(--a)) translateX(0) scale(1.4); }
  100% { opacity: 0; transform: rotate(var(--a)) translateX(150px) scale(0.3); }
}

@keyframes upg-blink {
  50% { opacity: 0.3; }
}

@keyframes nudge-in {
  from { opacity: 0; transform: translateY(20px); }
}

@keyframes pulse-ring {
  0% { box-shadow: 0 0 0 0 var(--blue-60); }
  100% { box-shadow: 0 0 0 12px transparent; }
}