/* Operations L3: Backward Gate */

.backward-page {
  --backward-ink: #211b19;
  --backward-paper: #f7e7c2;
  --backward-card: #fff5d9;
  --backward-brass: #d5a347;
  --backward-rust: #9f4f3f;
  --backward-blue: #436b77;
  --backward-deep: #231d20;
  color: var(--backward-ink);
}

.backward-topbar {
  border-color: rgba(213, 163, 71, 0.32);
}

.backward-progressbar {
  background: rgba(247, 231, 194, 0.74);
  border: 1px solid rgba(33, 27, 25, 0.16);
  border-radius: 999px;
  height: 8px;
  margin: 0 auto 10px;
  max-width: 1180px;
  overflow: hidden;
}

.backward-progressbar span {
  background: linear-gradient(90deg, var(--backward-rust), var(--backward-brass), var(--backward-blue));
  display: block;
  height: 100%;
  transition: width 320ms ease;
}

.backward-progress {
  display: flex;
  gap: 7px;
  justify-content: center;
  margin: 0 auto 12px;
}

.backward-progress__dot {
  background: rgba(33, 27, 25, 0.38);
  border: 1px solid rgba(247, 231, 194, 0.68);
  border-radius: 50%;
  height: 10px;
  width: 10px;
}

.backward-progress__dot.is-current {
  background: var(--backward-paper);
  box-shadow: 0 0 0 3px rgba(213, 163, 71, 0.22);
}

.backward-progress__dot.is-filled {
  background: var(--backward-brass);
  box-shadow: 0 0 12px rgba(213, 163, 71, 0.44);
}

.backward-room {
  margin: 0 auto;
  max-width: 1180px;
}

.backward-room__scene {
  background:
    radial-gradient(circle at 50% 18%, rgba(213, 163, 71, 0.25), transparent 24%),
    radial-gradient(circle at 86% 34%, rgba(67, 107, 119, 0.2), transparent 24%),
    linear-gradient(180deg, rgba(247, 231, 194, 0.1), rgba(33, 27, 25, 0.38)),
    url("../img/arena-operations-forge.jpg") center center / cover no-repeat;
  border: 1px solid rgba(247, 231, 194, 0.28);
  border-radius: 8px;
  box-shadow: 0 24px 60px rgba(33, 27, 25, 0.36);
  height: min(730px, calc(100vh - 150px));
  min-height: 660px;
  overflow: hidden;
  position: relative;
  isolation: isolate;
}

.backward-room__scene::before {
  background:
    repeating-linear-gradient(90deg, rgba(247, 231, 194, 0.05) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(0deg, rgba(247, 231, 194, 0.035) 0 1px, transparent 1px 70px),
    linear-gradient(90deg, rgba(33, 27, 25, 0.24), transparent 18%, transparent 82%, rgba(33, 27, 25, 0.28));
  content: "";
  inset: 0;
  position: absolute;
  z-index: -2;
}

.backward-room__scene::after {
  background:
    repeating-linear-gradient(90deg, rgba(247, 231, 194, 0.055) 0 2px, transparent 2px 80px),
    linear-gradient(180deg, #695241, #241a18);
  bottom: -102px;
  content: "";
  height: 260px;
  left: -8%;
  position: absolute;
  right: -8%;
  transform: perspective(760px) rotateX(48deg);
  transform-origin: bottom;
  z-index: -1;
}

.backward-room__doors,
.backward-room__lights {
  pointer-events: none;
  position: absolute;
  z-index: 1;
}

.backward-room__doors {
  display: flex;
  gap: 28px;
  left: 7%;
  top: 150px;
}

.backward-room__doors span {
  background:
    linear-gradient(180deg, rgba(247, 231, 194, 0.14), transparent 44%),
    linear-gradient(180deg, #4b3b32, #1e1715);
  border: 5px solid rgba(33, 27, 25, 0.9);
  border-bottom-width: 12px;
  border-radius: 54px 54px 6px 6px;
  box-shadow: inset 0 0 18px rgba(213, 163, 71, 0.12), 0 18px 26px rgba(0, 0, 0, 0.22);
  height: 118px;
  width: 74px;
}

.backward-room__lights {
  display: flex;
  gap: 18px;
  right: 7%;
  top: 58px;
}

.backward-room__lights span {
  background: radial-gradient(circle, #fff4bd 0 22%, var(--backward-brass) 23% 54%, transparent 55%);
  border-radius: 50%;
  filter: blur(0.2px);
  height: 62px;
  width: 62px;
}

.backward-room__prompt {
  left: 50%;
  max-width: min(720px, 68%);
  position: absolute;
  text-align: center;
  text-shadow: 0 3px 10px rgba(20, 18, 16, 0.58);
  top: 3%;
  transform: translateX(-50%);
  z-index: 5;
}

.backward-room__prompt span,
.backward-shelf__title span,
.backward-machine__header span,
.backward-trace__header span,
.backward-tray > span,
.backward-why span,
.backward-reward__copy span {
  color: rgba(255, 248, 228, 0.84);
  display: block;
  font-size: 0.68rem;
  font-weight: 900;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.backward-room__prompt h1 {
  color: #fff7df;
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 2.2vw, 1.88rem);
  line-height: 1.05;
  margin: 3px 0 0;
}

.backward-shelf {
  background: linear-gradient(180deg, rgba(33, 27, 25, 0.91), rgba(53, 48, 54, 0.9));
  border: 2px solid rgba(247, 231, 194, 0.28);
  border-radius: 8px;
  box-shadow: 0 14px 28px rgba(24, 20, 18, 0.28);
  left: 4%;
  padding: 9px 12px;
  position: absolute;
  right: 4%;
  top: 13%;
  z-index: 4;
}

.backward-shelf__title {
  align-items: center;
  display: flex;
  justify-content: space-between;
  margin-bottom: 7px;
}

.backward-shelf__title strong {
  color: #fff2c8;
  font-size: 0.82rem;
}

.backward-shelf__slots {
  display: grid;
  gap: 8px;
  grid-template-columns: repeat(6, minmax(0, 1fr));
}

.backward-shelf__slot {
  background: rgba(247, 231, 194, 0.08);
  border: 1px dashed rgba(247, 231, 194, 0.28);
  border-radius: 6px;
  min-height: 74px;
  padding: 6px;
}

.backward-shelf__slot.is-current {
  border-color: rgba(213, 163, 71, 0.62);
}

.backward-shelf__slot.is-filled {
  background: rgba(213, 163, 71, 0.12);
  border-style: solid;
}

.backward-key {
  background: linear-gradient(180deg, #b8aa91, #645340);
  border: 2px solid rgba(255, 248, 228, 0.18);
  border-radius: 7px;
  color: #fff7df;
  display: grid;
  gap: 3px;
  min-height: 60px;
  padding: 6px;
  place-items: center;
  text-align: center;
}

.backward-key.is-filled {
  background: linear-gradient(180deg, #e8c96f, #7b5a2c);
  box-shadow: 0 0 18px rgba(213, 163, 71, 0.28);
}

.backward-key span {
  background: currentColor;
  display: block;
  height: 14px;
  opacity: 0.88;
  transform: rotate(45deg);
  width: 14px;
}

.backward-key strong {
  font-family: var(--font-display);
  font-size: clamp(0.9rem, 1vw, 1.1rem);
  line-height: 1;
}

.backward-key em {
  font-size: 0.58rem;
  font-style: normal;
  font-weight: 900;
  line-height: 1.05;
}

.backward-steps {
  display: flex;
  gap: 8px;
  justify-content: center;
  left: 50%;
  max-width: 780px;
  position: absolute;
  top: 27%;
  transform: translateX(-50%);
  width: 74%;
  z-index: 5;
}

.backward-steps span {
  background: rgba(247, 231, 194, 0.86);
  border: 1px solid rgba(33, 27, 25, 0.1);
  border-radius: 999px;
  color: rgba(33, 27, 25, 0.66);
  flex: 1;
  font-size: 0.66rem;
  font-weight: 900;
  min-height: 28px;
  padding: 7px 10px;
  text-align: center;
}

.backward-steps span.is-active {
  background: #fff7df;
  color: var(--backward-rust);
  box-shadow: 0 0 0 3px rgba(213, 163, 71, 0.2);
}

.backward-steps span.is-complete {
  background: linear-gradient(135deg, var(--backward-brass), #efd88a);
  color: #342519;
}

.backward-workbench {
  align-items: stretch;
  display: grid;
  gap: 16px;
  grid-template-columns: minmax(0, 1.25fr) minmax(300px, 0.82fr) minmax(180px, 0.5fr);
  inset: 32% 4% 5%;
  position: absolute;
  z-index: 6;
}

.backward-workbench__main {
  display: grid;
  gap: 12px;
  grid-template-rows: 1fr 0.86fr;
  min-width: 0;
}

.backward-machine,
.backward-trace,
.backward-tray,
.backward-guide {
  background: rgba(255, 245, 217, 0.95);
  border: 2px solid rgba(255, 248, 228, 0.62);
  border-radius: 8px;
  box-shadow: 0 18px 34px rgba(33, 27, 25, 0.24);
}

.backward-machine,
.backward-trace,
.backward-tray {
  padding: 13px;
}

.backward-machine__header,
.backward-trace__header {
  align-items: baseline;
  display: flex;
  gap: 12px;
  justify-content: space-between;
  margin-bottom: 10px;
}

.backward-machine__header span,
.backward-trace__header span,
.backward-tray > span,
.backward-why span,
.backward-reward__copy span {
  color: rgba(33, 27, 25, 0.54);
}

.backward-machine__header strong,
.backward-trace__header strong {
  color: #453018;
  font-family: var(--font-display);
  font-size: clamp(1rem, 1.55vw, 1.38rem);
  line-height: 1;
}

.backward-chain {
  align-items: center;
  display: grid;
  gap: 8px;
  grid-template-columns: 0.8fr 22px 0.8fr 22px 0.8fr 22px 0.8fr;
}

.backward-chain__card,
.backward-trace__value,
.backward-trace__op {
  align-items: center;
  border-radius: 8px;
  display: flex;
  font-family: var(--font-display);
  font-weight: 900;
  justify-content: center;
  line-height: 1;
  min-height: 58px;
  text-align: center;
}

.backward-chain__card {
  background: linear-gradient(180deg, #fffdf0, #ead5aa);
  border: 1px solid rgba(33, 27, 25, 0.15);
  color: #453018;
  font-size: clamp(1.2rem, 2.5vw, 2.4rem);
}

.backward-chain__card.is-op {
  background: linear-gradient(180deg, #f6d989, #ba763f);
}

.backward-chain__card.is-end {
  background: linear-gradient(180deg, #c9e0df, #6f9ba0);
}

.backward-chain__arrow {
  color: rgba(33, 27, 25, 0.46);
  font-size: 1.2rem;
  font-weight: 900;
  text-align: center;
}

.backward-machine p,
.backward-trace p {
  color: rgba(33, 27, 25, 0.64);
  font-size: 0.78rem;
  font-weight: 850;
  line-height: 1.25;
  margin: 10px 0 0;
  text-align: center;
}

.backward-trace__row {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  min-height: 68px;
}

.backward-trace__value,
.backward-trace__op {
  border: 1px solid rgba(33, 27, 25, 0.14);
  min-width: 54px;
  padding: 10px;
}

.backward-trace__value {
  background: #fffdf0;
  color: #453018;
  font-size: clamp(1.3rem, 2.3vw, 2.1rem);
}

.backward-trace__op {
  background: rgba(67, 107, 119, 0.14);
  color: var(--backward-blue);
  font-size: 1.18rem;
}

.backward-trace__value.is-current {
  box-shadow: 0 0 0 3px rgba(213, 163, 71, 0.2);
}

.backward-trace__value.is-empty,
.backward-trace__op.is-empty {
  background: rgba(33, 27, 25, 0.08);
  color: rgba(33, 27, 25, 0.34);
}

.backward-tray {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 0;
}

.backward-tray > span {
  text-align: center;
}

.backward-tray__pins {
  display: grid;
  gap: 10px;
  margin-top: 12px;
}

.backward-pin {
  align-items: center;
  background: #fff9e8;
  border: 1px solid rgba(33, 27, 25, 0.14);
  border-radius: 8px;
  color: var(--backward-ink);
  cursor: pointer;
  display: grid;
  gap: 9px;
  grid-template-columns: 24px 1fr;
  min-height: 54px;
  padding: 9px 12px;
  text-align: left;
}

.backward-pin span {
  background: var(--backward-blue);
  display: inline-block;
  height: 16px;
  transform: rotate(45deg);
  width: 16px;
}

.backward-pin strong {
  color: #453018;
  font-family: var(--font-display);
  font-size: 1.22rem;
}

.backward-pin:hover {
  border-color: rgba(213, 163, 71, 0.56);
  box-shadow: 0 0 0 3px rgba(213, 163, 71, 0.14);
}

.backward-pin.is-used,
.backward-pin:disabled {
  cursor: default;
  opacity: 0.55;
}

.backward-pin.is-wrong {
  border-color: rgba(159, 79, 63, 0.78);
  box-shadow: 0 0 0 3px rgba(159, 79, 63, 0.14);
}

.backward-lock {
  background: linear-gradient(135deg, rgba(33, 27, 25, 0.22), rgba(33, 27, 25, 0.14));
  border: 0;
  border-radius: 8px;
  color: rgba(33, 27, 25, 0.58);
  cursor: pointer;
  font-weight: 950;
  margin-top: 14px;
  min-height: 46px;
  padding: 10px 16px;
  width: 100%;
}

.backward-lock.is-ready {
  background: linear-gradient(135deg, var(--backward-blue), var(--backward-brass));
  color: #fff7df;
  box-shadow: 0 12px 24px rgba(67, 107, 119, 0.24);
}

.backward-lock:disabled {
  cursor: default;
  opacity: 0.65;
}

.backward-guide {
  align-self: stretch;
  display: flex;
  flex-direction: column;
  justify-content: end;
  min-height: 0;
  padding: 14px;
  position: relative;
  text-align: center;
}

.backward-guide__orb {
  background: radial-gradient(circle, #fff1aa, var(--backward-brass) 42%, transparent 72%);
  border-radius: 50%;
  height: 72px;
  margin: 0 auto 8px;
  width: 72px;
}

.backward-guide__head {
  background: #d9a77f;
  border-radius: 50%;
  height: 48px;
  margin: 0 auto;
  position: relative;
  width: 48px;
}

.backward-guide__head span {
  background: rgba(33, 27, 25, 0.76);
  border-radius: 999px 999px 40% 40%;
  display: block;
  height: 18px;
  left: 6px;
  position: absolute;
  top: -6px;
  width: 36px;
}

.backward-guide__body {
  background: linear-gradient(180deg, #5d4b7a, #2f2943);
  border-radius: 24px 24px 8px 8px;
  height: 92px;
  margin: -2px auto 8px;
  width: 78px;
}

.backward-guide__bubble {
  background: #fff7df;
  border: 1px solid rgba(33, 27, 25, 0.12);
  border-radius: 8px;
  color: rgba(33, 27, 25, 0.76);
  font-size: 0.78rem;
  font-weight: 900;
  line-height: 1.25;
  padding: 10px;
}

.backward-celebration {
  background: rgba(255, 247, 223, 0.97);
  border: 2px solid rgba(213, 163, 71, 0.52);
  border-radius: 8px;
  box-shadow: 0 18px 40px rgba(33, 27, 25, 0.32);
  display: grid;
  gap: 8px;
  left: 50%;
  max-width: 620px;
  padding: 14px;
  position: absolute;
  text-align: center;
  top: 50%;
  transform: translate(-50%, -50%);
  width: min(620px, 86%);
  z-index: 12;
}

.backward-celebration > strong {
  color: #453018;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 2.4vw, 2rem);
}

.backward-celebration > span {
  color: rgba(33, 27, 25, 0.68);
  font-weight: 900;
}

.backward-why {
  background: rgba(67, 107, 119, 0.1);
  border-radius: 8px;
  padding: 10px 12px;
}

.backward-why p {
  color: rgba(33, 27, 25, 0.75);
  font-size: 0.86rem;
  font-weight: 850;
  line-height: 1.35;
  margin: 4px 0 0;
}

.backward-reward {
  align-items: center;
  display: flex;
  inset: 0;
  justify-content: center;
  padding: 22px;
  position: absolute;
  z-index: 10;
}

.backward-reward__card {
  background: rgba(255, 247, 223, 0.97);
  border: 2px solid rgba(213, 163, 71, 0.55);
  border-radius: 8px;
  box-shadow: 0 22px 58px rgba(33, 27, 25, 0.38);
  display: grid;
  gap: 12px;
  max-height: 100%;
  max-width: 920px;
  overflow: auto;
  padding: 20px;
  text-align: center;
  width: min(920px, 94%);
}

.backward-reward__copy h2 {
  color: #453018;
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 4vw, 3.4rem);
  line-height: 1;
  margin: 4px 0 6px;
}

.backward-reward__copy p {
  color: rgba(33, 27, 25, 0.7);
  font-weight: 850;
  margin: 0;
}

.backward-reward__keys {
  display: grid;
  gap: 8px;
  grid-template-columns: repeat(6, minmax(0, 1fr));
}

.backward-reward__badges,
.backward-reward__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
}

.backward-reward__badges span {
  background: rgba(67, 107, 119, 0.1);
  border-radius: 999px;
  color: rgba(33, 27, 25, 0.72);
  font-size: 0.78rem;
  font-weight: 900;
  padding: 8px 12px;
}

@media (max-width: 900px) {
  .backward-room__scene {
    height: auto;
    min-height: 900px;
    overflow: hidden;
  }

  .backward-workbench {
    grid-template-columns: 1fr;
    inset: 320px 4% auto;
  }

  .backward-guide {
    display: none;
  }

  .backward-steps {
    top: 250px;
    width: 90%;
  }
}