/* =========================================================
  ChemEquilibrium Lab - assets/css/concept.css
  ---------------------------------------------------------
  Style khusus Mode Konsep:
  - kartu konsep interaktif
  - panggung animasi kesetimbangan dinamis
  - visual laju maju dan balik
  - visual Q vs K
  - visual asas Le Chatelier
  - visual katalis
  - responsive polish
========================================================= */

/* =========================================================
  Concept Panel Decorative Layers
========================================================= */

.concept-panel {
  position: relative;
  overflow: hidden;
}

.concept-panel::before,
.concept-panel::after {
  content: "";
  position: absolute;
  pointer-events: none;
  border-radius: var(--radius-full);
  z-index: 0;
}

.concept-panel::before {
  width: 520px;
  height: 520px;
  left: -180px;
  top: -120px;
  background: radial-gradient(circle, rgba(147, 51, 234, 0.16), transparent 70%);
}

.concept-panel::after {
  width: 420px;
  height: 420px;
  right: -130px;
  bottom: -160px;
  background: radial-gradient(circle, rgba(34, 211, 238, 0.16), transparent 70%);
}

.concept-panel > * {
  position: relative;
  z-index: 1;
}

/* =========================================================
  Concept Cards Enhancement
========================================================= */

.concept-card-grid {
  position: relative;
  z-index: 1;
}

.concept-card {
  isolation: isolate;
}

.concept-card::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  opacity: 0;
  background:
    radial-gradient(circle at 22% 18%, rgba(255, 255, 255, 0.78), transparent 30%),
    linear-gradient(135deg, rgba(239, 246, 255, 0.78), rgba(250, 245, 255, 0.82));
  transition: opacity var(--duration-slow) var(--ease-out);
}

.concept-card:hover::before,
.concept-card.is-active::before {
  opacity: 1;
}

.concept-card.is-active .concept-icon {
  animation: conceptIconPulse 1.8s ease-in-out infinite;
}

@keyframes conceptIconPulse {
  0%,
  100% {
    transform: scale(1);
    box-shadow: var(--shadow-sm);
  }

  50% {
    transform: scale(1.06);
    box-shadow: var(--shadow-md), var(--shadow-glow-purple);
  }
}

.concept-card[data-concept="dynamic"] .concept-icon {
  background: var(--gradient-secondary);
}

.concept-card[data-concept="qk"] .concept-icon {
  background: var(--gradient-primary);
}

.concept-card[data-concept="lechatelier"] .concept-icon {
  color: var(--slate-900);
  background: var(--gradient-warning);
}

.concept-card[data-concept="catalyst"] .concept-icon {
  background: var(--gradient-success);
}

.concept-card h3 {
  font-size: clamp(var(--text-lg), 2vw, var(--text-2xl));
}

.concept-card p {
  color: var(--text-muted);
  font-size: var(--text-base);
}

/* =========================================================
  Concept Animation Stage
========================================================= */

.concept-animation-stage {
  position: relative;
  overflow: hidden;
  isolation: isolate;
}

.concept-animation-stage::before {
  content: "";
  position: absolute;
  inset: var(--space-4);
  z-index: -1;
  border-radius: var(--radius-3xl);
  border: 1px dashed rgba(147, 51, 234, 0.18);
  pointer-events: none;
}

.concept-animation-stage::after {
  content: "Kesetimbangan Dinamis";
  position: absolute;
  right: var(--space-5);
  bottom: var(--space-5);
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-full);
  color: var(--secondary);
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid var(--border-soft);
  box-shadow: var(--shadow-xs);
  font-size: var(--text-xs);
  font-weight: 950;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.rate-balance {
  position: relative;
}

.rate-balance::before {
  content: "";
  position: absolute;
  left: 14%;
  right: 14%;
  top: 50%;
  height: 4px;
  border-radius: var(--radius-full);
  background: linear-gradient(90deg, var(--reactant), var(--equilibrium), var(--product));
  opacity: 0.22;
  transform: translateY(-50%);
}

.rate-column,
.balance-center {
  position: relative;
  z-index: 1;
}

.rate-column {
  min-height: 260px;
  padding: var(--space-5);
  border-radius: var(--radius-2xl);
  background: rgba(255, 255, 255, 0.68);
  border: 1px solid var(--border-soft);
  box-shadow: var(--shadow-sm);
}

.forward-rate {
  background:
    radial-gradient(circle at 20% 18%, rgba(37, 99, 235, 0.12), transparent 35%),
    rgba(255, 255, 255, 0.7);
}

.reverse-rate {
  background:
    radial-gradient(circle at 82% 18%, rgba(249, 115, 22, 0.12), transparent 35%),
    rgba(255, 255, 255, 0.7);
}

.rate-column strong {
  color: var(--text-main);
  font-size: var(--text-xl);
}

.rate-column .rate-arrow {
  transition:
    transform var(--duration-slow) var(--ease-out),
    box-shadow var(--duration-slow) var(--ease-out),
    filter var(--duration-slow) var(--ease-out);
}

.forward-rate:hover .rate-arrow,
.forward-rate.is-dominant .rate-arrow {
  transform: translateX(8px) scale(1.04);
  filter: saturate(1.08);
}

.reverse-rate:hover .rate-arrow,
.reverse-rate.is-dominant .rate-arrow {
  transform: translateX(-8px) scale(1.04);
  filter: saturate(1.08);
}

.rate-meter {
  position: relative;
  box-shadow: inset 0 1px 2px rgba(15, 23, 42, 0.14);
}

.rate-meter span {
  position: relative;
  overflow: hidden;
  transition: width var(--duration-long) var(--ease-out);
}

.rate-meter span::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.44), transparent);
  transform: translateX(-100%);
  animation: conceptMeterShimmer 2.2s ease-in-out infinite;
}

@keyframes conceptMeterShimmer {
  0% {
    transform: translateX(-100%);
  }

  72%,
  100% {
    transform: translateX(100%);
  }
}

.balance-center {
  min-height: 300px;
  padding: var(--space-6);
  border-radius: var(--radius-3xl);
  background:
    radial-gradient(circle at 50% 16%, rgba(147, 51, 234, 0.16), transparent 34%),
    rgba(255, 255, 255, 0.76);
  border: 1px solid rgba(147, 51, 234, 0.18);
  box-shadow: var(--shadow-md);
}

.balance-scale {
  display: inline-grid;
  place-items: center;
  width: 116px;
  height: 116px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.86);
  box-shadow: var(--shadow-md), var(--shadow-glow-purple);
  line-height: 1;
}

#conceptMessage {
  max-width: 32ch;
  color: var(--text-muted);
  font-size: var(--text-lg);
  line-height: var(--leading-relaxed);
}

/* =========================================================
  Dynamic Molecule Stream
========================================================= */

.concept-particle-stream {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
}

.concept-stream-particle {
  position: absolute;
  width: 18px;
  height: 18px;
  border-radius: var(--radius-full);
  box-shadow:
    inset -4px -4px 7px rgba(0, 0, 0, 0.18),
    inset 4px 4px 7px rgba(255, 255, 255, 0.74),
    0 4px 10px rgba(15, 23, 42, 0.14);
  opacity: 0.74;
}

.concept-stream-particle.is-reactant {
  background: var(--reactant);
  animation: conceptStreamForward 4s linear infinite;
}

.concept-stream-particle.is-product {
  background: var(--product);
  animation: conceptStreamBackward 4.4s linear infinite;
}

@keyframes conceptStreamForward {
  from {
    transform: translate(-20px, 0) scale(0.86);
  }

  45% {
    transform: translate(48vw, -14px) scale(1.08);
  }

  to {
    transform: translate(100vw, 8px) scale(0.92);
  }
}

@keyframes conceptStreamBackward {
  from {
    transform: translate(100vw, 0) scale(0.92);
  }

  45% {
    transform: translate(48vw, 14px) scale(1.08);
  }

  to {
    transform: translate(-20px, -8px) scale(0.86);
  }
}

/* =========================================================
  Concept Detail Panels
========================================================= */

.concept-detail-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
  margin: var(--space-5);
}

.concept-detail-card {
  display: grid;
  gap: var(--space-3);
  padding: var(--space-5);
  border-radius: var(--radius-2xl);
  background: rgba(255, 255, 255, 0.76);
  border: 1px solid var(--border-soft);
  box-shadow: var(--shadow-sm);
}

.concept-detail-card h4 {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--text-main);
}

.concept-detail-card h4::before {
  content: "";
  width: 10px;
  height: 10px;
  border-radius: var(--radius-full);
  background: var(--gradient-equilibrium);
  box-shadow: 0 0 0 5px rgba(147, 51, 234, 0.12);
}

.concept-detail-card p {
  color: var(--text-muted);
  line-height: var(--leading-relaxed);
}

/* =========================================================
  Q vs K Visual Helpers
========================================================= */

.qk-visual {
  width: min(680px, 100%);
  display: grid;
  gap: var(--space-4);
  padding: var(--space-5);
  border-radius: var(--radius-3xl);
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid var(--border-soft);
  box-shadow: var(--shadow-md);
}

.qk-scale {
  position: relative;
  height: 18px;
  border-radius: var(--radius-full);
  background: linear-gradient(90deg, var(--reactant), var(--equilibrium), var(--product));
  box-shadow: inset 0 1px 2px rgba(15, 23, 42, 0.2);
}

.qk-marker {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 34px;
  height: 34px;
  border: 4px solid var(--color-white);
  border-radius: var(--radius-full);
  background: var(--equilibrium);
  box-shadow: var(--shadow-md);
  transform: translate(-50%, -50%);
  transition:
    left var(--duration-long) var(--ease-out),
    background-color var(--duration-long) var(--ease-out);
}

.qk-label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  color: var(--text-muted);
  font-size: var(--text-sm);
  font-weight: 900;
}

.qk-result {
  text-align: center;
  color: var(--text-main);
  font-size: var(--text-xl);
  font-weight: 950;
}

.qk-visual.is-left .qk-marker {
  left: 22%;
  background: var(--reactant);
}

.qk-visual.is-right .qk-marker {
  left: 78%;
  background: var(--product);
}

.qk-visual.is-balanced .qk-marker {
  left: 50%;
  background: var(--success);
}

/* =========================================================
  Le Chatelier Visual Helpers
========================================================= */

.lechatelier-visual {
  width: min(780px, 100%);
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  gap: var(--space-4);
  align-items: center;
  padding: var(--space-5);
  border-radius: var(--radius-3xl);
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid var(--border-soft);
  box-shadow: var(--shadow-md);
}

.lechatelier-side {
  display: grid;
  justify-items: center;
  gap: var(--space-3);
  padding: var(--space-4);
  border-radius: var(--radius-2xl);
  background: rgba(255, 255, 255, 0.68);
  border: 1px solid var(--border-soft);
  text-align: center;
}

.lechatelier-side strong {
  color: var(--text-main);
  font-size: var(--text-xl);
}

.lechatelier-side p {
  color: var(--text-muted);
}

.lechatelier-arrow {
  color: var(--equilibrium);
  font-size: var(--text-5xl);
  font-weight: 950;
  animation: conceptLeChatelierArrowPulse 2.4s ease-in-out infinite;
}

@keyframes conceptLeChatelierArrowPulse {
  0%,
  100% {
    transform: translateX(0);
    opacity: 1;
  }

  45% {
    transform: translateX(5px);
    opacity: 0.82;
  }

  70% {
    transform: translateX(-5px);
    opacity: 0.92;
  }
}

.disturbance-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-full);
  color: var(--color-white);
  background: var(--gradient-danger);
  box-shadow: var(--shadow-sm);
  font-size: var(--text-sm);
  font-weight: 900;
}

/* =========================================================
  Catalyst Visual Helpers
========================================================= */

.catalyst-visual {
  width: min(680px, 100%);
  display: grid;
  gap: var(--space-5);
  padding: var(--space-5);
  border-radius: var(--radius-3xl);
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid var(--border-soft);
  box-shadow: var(--shadow-md);
}

.catalyst-track {
  position: relative;
  height: 88px;
  overflow: hidden;
  border-radius: var(--radius-2xl);
  background: linear-gradient(135deg, var(--success-soft), var(--purple-50));
  border: 1px solid var(--border-soft);
}

.catalyst-track::before,
.catalyst-track::after {
  content: "";
  position: absolute;
  top: 50%;
  width: 30px;
  height: 30px;
  border-radius: var(--radius-full);
  transform: translateY(-50%);
  box-shadow: var(--shadow-sm);
}

.catalyst-track::before {
  left: 14%;
  background: var(--reactant);
  animation: conceptCatalystMoveForward 2.6s linear infinite;
}

.catalyst-track::after {
  right: 14%;
  background: var(--product);
  animation: conceptCatalystMoveBackward 2.6s linear infinite;
}

.catalyst-center {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 74px;
  height: 74px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-full);
  color: var(--color-white);
  background: var(--gradient-success);
  box-shadow: var(--shadow-md), 0 0 34px rgba(22, 163, 74, 0.26);
  transform: translate(-50%, -50%);
  font-size: var(--text-3xl);
  font-weight: 950;
}

@keyframes conceptCatalystMoveForward {
  from {
    transform: translate(-70px, -50%) scale(0.9);
  }

  50% {
    transform: translate(240px, -50%) scale(1.1);
  }

  to {
    transform: translate(520px, -50%) scale(0.9);
  }
}

@keyframes conceptCatalystMoveBackward {
  from {
    transform: translate(70px, -50%) scale(0.9);
  }

  50% {
    transform: translate(-240px, -50%) scale(1.1);
  }

  to {
    transform: translate(-520px, -50%) scale(0.9);
  }
}

/* =========================================================
  Concept State Classes
========================================================= */

.concept-panel.is-dynamic .balance-center {
  border-color: rgba(147, 51, 234, 0.22);
}

.concept-panel.is-qk .balance-center {
  border-color: rgba(37, 99, 235, 0.22);
}

.concept-panel.is-lechatelier .balance-center {
  border-color: rgba(249, 115, 22, 0.24);
}

.concept-panel.is-catalyst .balance-center {
  border-color: rgba(22, 163, 74, 0.22);
}

.concept-panel.is-balanced .balance-scale {
  box-shadow: var(--shadow-md), 0 0 34px rgba(22, 163, 74, 0.28);
}

.concept-panel.is-forward-dominant .forward-rate {
  border-color: rgba(37, 99, 235, 0.26);
  box-shadow: var(--shadow-md), var(--shadow-glow-blue);
}

.concept-panel.is-reverse-dominant .reverse-rate {
  border-color: rgba(249, 115, 22, 0.28);
  box-shadow: var(--shadow-md), var(--shadow-glow-orange);
}

/* =========================================================
  Responsive Concept Mode
========================================================= */

@media (max-width: 1180px) {
  .concept-card {
    min-height: 200px;
  }

  .rate-balance {
    gap: var(--space-4);
  }

  .rate-column {
    min-height: 240px;
  }

  .balance-center {
    min-height: 270px;
  }
}

@media (max-width: 980px) {
  .rate-balance::before {
    display: none;
  }

  .concept-detail-grid {
    grid-template-columns: 1fr;
  }

  .lechatelier-visual {
    grid-template-columns: 1fr;
  }

  .lechatelier-arrow {
    transform: rotate(90deg);
  }

  .balance-center {
    order: -1;
  }
}

@media (max-width: 760px) {
  .concept-panel::before,
  .concept-panel::after {
    opacity: 0.55;
  }

  .concept-animation-stage {
    margin: 0 var(--space-3);
    padding: var(--space-4);
  }

  .concept-animation-stage::before {
    inset: var(--space-2);
  }

  .concept-animation-stage::after {
    position: static;
    width: fit-content;
    margin: var(--space-4) auto 0;
    transform: none;
  }

  .rate-column {
    min-height: auto;
    padding: var(--space-4);
  }

  .balance-center {
    min-height: auto;
    padding: var(--space-5);
  }

  .balance-scale {
    width: 92px;
    height: 92px;
    font-size: 3.8rem;
  }

  .rate-arrow {
    width: 72px;
    height: 72px;
    font-size: var(--text-4xl);
  }

  #conceptMessage {
    font-size: var(--text-base);
  }

  .qk-visual,
  .lechatelier-visual,
  .catalyst-visual {
    padding: var(--space-4);
  }

  .catalyst-track {
    height: 76px;
  }

  .catalyst-center {
    width: 62px;
    height: 62px;
    font-size: var(--text-2xl);
  }
}

@media (max-width: 520px) {
  .concept-card {
    padding: var(--space-4);
  }

  .concept-icon {
    width: 52px;
    height: 52px;
    font-size: var(--text-xl);
  }

  .concept-card h3 {
    font-size: var(--text-xl);
  }

  .rate-column strong {
    font-size: var(--text-lg);
  }

  .qk-label-row {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-2);
    text-align: center;
  }

  .qk-result {
    font-size: var(--text-lg);
  }

  .lechatelier-side {
    padding: var(--space-3);
  }
}

/* =========================================================
  Reduced Motion
========================================================= */

@media (prefers-reduced-motion: reduce) {
  .concept-card.is-active .concept-icon,
  .rate-meter span::after,
  .concept-stream-particle,
  .lechatelier-arrow,
  .catalyst-track::before,
  .catalyst-track::after {
    animation: none !important;
  }
}