/* =========================================================
  MoleLab Interaktif - assets/css/layout.css
  ---------------------------------------------------------
  Struktur besar aplikasi:
  - app shell
  - home screen
  - header navigation
  - workspace dua kolom
  - panel simulasi
  - panel kanan
  - layout tiap mode
  - modal bantuan
  - fixed stage scale support
========================================================= */

/* =========================================================
  App Shell & Screen System
========================================================= */

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

.app-shell {
  width: var(--design-width);
  min-height: var(--design-height);
  position: relative;
  isolation: isolate;
  transform: scale(var(--app-scale));
  transform-origin: top left;
}

.screen {
  width: 100%;
}

.app-screen {
  display: none;
  animation: screenFadeIn var(--duration-slow) var(--ease-out);
}

.app-screen.is-active {
  display: block;
}

@keyframes screenFadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* =========================================================
  Home / Landing Screen
========================================================= */

.home-screen {
  width: var(--design-width);
  min-height: var(--design-height);
  display: none;
  place-items: center;
  padding: clamp(var(--space-6), 5vw, var(--space-16));
  color: var(--color-white);
  background: var(--gradient-dark);
  position: relative;
  overflow: hidden;
}

.home-screen.is-active {
  display: grid;
}

.home-background {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: -1;
}

.orb {
  position: absolute;
  display: block;
  border-radius: var(--radius-full);
  filter: blur(2px);
  opacity: 0.9;
}

.orb-blue {
  width: 44rem;
  height: 44rem;
  left: -16rem;
  top: -18rem;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.42), transparent 64%);
}

.orb-yellow {
  width: 36rem;
  height: 36rem;
  right: -12rem;
  bottom: -15rem;
  background: radial-gradient(circle, rgba(250, 204, 21, 0.26), transparent 66%);
}

.orb-green {
  width: 28rem;
  height: 28rem;
  right: 18%;
  top: 4rem;
  background: radial-gradient(circle, rgba(34, 197, 94, 0.16), transparent 70%);
}

.orb-purple {
  width: 34rem;
  height: 34rem;
  left: 36%;
  bottom: -18rem;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.18), transparent 70%);
}

.home-content {
  width: 1180px;
  max-width: none;
  margin-inline: auto;
  text-align: center;
  position: relative;
  z-index: 1;
}

.home-title {
  margin-bottom: var(--space-5);
  color: var(--color-white);
  letter-spacing: -0.075em;
}

.home-subtitle {
  max-width: 840px;
  margin: 0 auto var(--space-8);
  color: rgba(255, 255, 255, 0.76);
  font-size: clamp(var(--text-base), 2vw, var(--text-xl));
  line-height: var(--leading-relaxed);
}

.home-hero-visual {
  width: min(680px, 100%);
  min-height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-5);
  margin: 0 auto var(--space-8);
  padding: var(--space-4) var(--space-6);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--radius-3xl);
  background: rgba(255, 255, 255, 0.08);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.16);
  backdrop-filter: blur(18px);
}

.hero-molecule {
  width: 260px;
  height: 90px;
  position: relative;
  flex: 0 0 auto;
}

.hero-equation-card {
  min-width: 250px;
  display: grid;
  gap: var(--space-1);
  padding: var(--space-4);
  border-radius: var(--radius-2xl);
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow-md);
  text-align: left;
}

.hero-equation-card span {
  color: var(--text-muted);
  font-size: var(--text-sm);
  font-weight: 850;
}

.hero-equation-card strong {
  color: var(--primary);
  font-size: var(--text-xl);
  line-height: var(--leading-tight);
}

.mode-card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(var(--space-4), 2vw, var(--space-6));
  align-items: stretch;
}

.mode-card-grid-large {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.mode-card-wide {
  grid-column: span 2;
}

/* =========================================================
  Header / Navigation
========================================================= */

.app-header {
  width: var(--design-width);
  min-height: var(--header-height);
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  display: grid;
  grid-template-columns: 210px minmax(0, 1fr) 142px;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-3) var(--space-5);
  background: rgba(255, 255, 255, 0.82);
  border-bottom: 1px solid var(--border-soft);
  box-shadow: 0 8px 30px rgba(15, 23, 42, 0.06);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  justify-content: flex-start;
  gap: var(--space-3);
  min-width: 0;
}

.brand-icon {
  width: 44px;
  min-width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-lg);
  color: var(--color-white);
  background: var(--gradient-primary);
  box-shadow: var(--shadow-md);
  font-size: var(--text-2xl);
  line-height: 1;
}

.brand strong {
  display: block;
  color: var(--text-main);
  font-size: var(--text-xl);
  line-height: 1.1;
  letter-spacing: -0.04em;
}

.brand small {
  display: block;
  color: var(--text-muted);
  font-size: var(--text-xs);
  font-weight: 750;
  letter-spacing: 0.02em;
}

.main-tabs {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  min-width: 0;
  padding: var(--space-1);
  border-radius: var(--radius-xl);
  background: rgba(15, 23, 42, 0.06);
  border: 1px solid rgba(15, 23, 42, 0.06);
  overflow-x: auto;
  scrollbar-width: none;
}

.main-tabs::-webkit-scrollbar {
  display: none;
}

.tab-button {
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0 var(--space-3);
  border-radius: var(--radius-lg);
  color: var(--color-slate-600);
  background: transparent;
  box-shadow: none;
  font-size: var(--text-sm);
  font-weight: 850;
  white-space: nowrap;
  transition:
    color var(--duration-fast) var(--ease-out),
    background-color var(--duration-fast) var(--ease-out),
    box-shadow var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-out);
}

.tab-button:hover {
  transform: translateY(-1px);
  color: var(--primary);
  background: rgba(255, 255, 255, 0.66);
}

.tab-button.is-active {
  color: var(--primary);
  background: var(--color-white);
  box-shadow: var(--shadow-sm);
}

.header-actions {
  display: inline-flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-2);
}

/* =========================================================
  Main Content & Workspace
========================================================= */

.app-main {
  width: var(--design-width);
  min-height: calc(var(--design-height) - var(--header-height));
  padding: var(--space-5);
  overflow: visible;
}

.workspace {
  width: calc(var(--design-width) - 40px);
  max-width: none;
  margin-inline: auto;
}

.workspace-two-columns {
  display: grid;
  grid-template-columns: minmax(0, 930px) var(--side-panel-width);
  gap: var(--space-5);
  align-items: start;
}

.lab-panel,
.info-card {
  background: var(--surface);
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(18px);
}

.lab-panel {
  min-height: 775px;
  position: relative;
  overflow: hidden;
}

.side-panel-stack {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  align-content: start;
}

.info-card {
  padding: var(--space-4);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.card-header h3 {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--text-main);
  font-size: var(--text-xl);
}

/* =========================================================
  Shared Lab Layout
========================================================= */

.mole-lab-panel,
.particle-lab-panel,
.gas-lab-panel,
.percent-lab-panel,
.concentration-lab-panel {
  background:
    radial-gradient(circle at 50% 42%, rgba(96, 165, 250, 0.14), transparent 34%),
    radial-gradient(circle at 82% 16%, rgba(250, 204, 21, 0.14), transparent 26%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(240, 249, 255, 0.88));
}

.particle-lab-panel {
  background:
    radial-gradient(circle at 40% 38%, rgba(250, 204, 21, 0.18), transparent 34%),
    radial-gradient(circle at 76% 28%, rgba(34, 211, 238, 0.16), transparent 28%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(255, 251, 235, 0.86));
}

.gas-lab-panel {
  background:
    radial-gradient(circle at 40% 42%, rgba(34, 211, 238, 0.18), transparent 36%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(236, 254, 255, 0.88));
}

.percent-lab-panel {
  background:
    radial-gradient(circle at 42% 38%, rgba(168, 85, 247, 0.16), transparent 34%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(250, 245, 255, 0.88));
}

.concentration-lab-panel {
  background:
    radial-gradient(circle at 44% 40%, rgba(59, 130, 246, 0.16), transparent 34%),
    radial-gradient(circle at 74% 22%, rgba(34, 211, 238, 0.16), transparent 28%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(239, 246, 255, 0.88));
}

.lab-toolbar {
  position: absolute;
  top: var(--space-5);
  left: var(--space-5);
  right: var(--space-5);
  z-index: 8;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
  pointer-events: none;
}

.lab-toolbar > * {
  pointer-events: auto;
}

.simulation-stage {
  position: absolute;
  inset: 92px var(--space-5) 170px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: var(--radius-3xl);
  background:
    radial-gradient(circle at 50% 45%, rgba(255, 255, 255, 0.72), transparent 58%),
    rgba(255, 255, 255, 0.4);
  overflow: hidden;
}

.simulation-stage::before {
  content: "";
  position: absolute;
  inset: var(--space-4);
  border: 1px dashed rgba(37, 99, 235, 0.18);
  border-radius: var(--radius-2xl);
  pointer-events: none;
}

.experiment-control-panel {
  position: absolute;
  left: var(--space-5);
  right: var(--space-5);
  bottom: var(--space-5);
  z-index: 9;
  display: flex;
  align-items: end;
  gap: var(--space-3);
  padding: var(--space-4);
  border-radius: var(--radius-2xl);
  background: rgba(255, 255, 255, 0.86);
  border: 1px solid rgba(255, 255, 255, 0.76);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(14px);
}

.grid-controls {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr)) auto;
  align-items: end;
}

.formula-input-group {
  min-width: 240px;
}

.quick-compound-row {
  flex: 1;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* =========================================================
  Mode-specific Stage Layout
========================================================= */

.molecule-stage {
  padding: var(--space-8);
}

.molecule-display {
  width: 100%;
  height: 100%;
  position: relative;
  display: grid;
  place-items: center;
}

.empty-visual-state {
  display: grid;
  justify-items: center;
  gap: var(--space-3);
  color: var(--text-muted);
  text-align: center;
}

.empty-icon {
  width: 120px;
  height: 120px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-3xl);
  color: var(--primary);
  background: rgba(255, 255, 255, 0.86);
  box-shadow: var(--shadow-md);
  font-size: var(--text-4xl);
  font-weight: 950;
}

.scale-stage,
.particle-stage,
.gas-stage,
.percent-stage,
.beaker-stage {
  grid-template-columns: 1fr;
}

.conversion-flow {
  position: absolute;
  left: var(--space-8);
  right: var(--space-8);
  bottom: var(--space-8);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
}

.flow-card {
  min-width: 150px;
  display: grid;
  gap: var(--space-1);
  padding: var(--space-4);
  border-radius: var(--radius-2xl);
  background: rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow-md);
  text-align: center;
}

.flow-card span {
  color: var(--text-muted);
  font-size: var(--text-sm);
  font-weight: 850;
}

.flow-card strong {
  color: var(--text-main);
  font-size: var(--text-2xl);
}

.flow-card-active strong {
  color: var(--success);
}

.flow-arrow {
  color: var(--primary);
  font-size: var(--text-lg);
  font-weight: 950;
}

.avogadro-package-area,
.particle-cloud,
.mass-percent-chart,
.percent-molecule-preview {
  position: relative;
  z-index: 1;
}

.volume-meter,
.concentration-meter {
  position: absolute;
  right: var(--space-8);
  bottom: var(--space-8);
  min-width: 210px;
  display: grid;
  gap: var(--space-1);
  padding: var(--space-4);
  border-radius: var(--radius-2xl);
  background: rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow-md);
  text-align: center;
}

.volume-meter span,
.concentration-meter span {
  color: var(--text-muted);
  font-size: var(--text-sm);
  font-weight: 850;
}

.volume-meter strong,
.concentration-meter strong {
  color: var(--primary);
  font-size: var(--text-3xl);
  line-height: 1;
}

.concentration-tabs {
  position: absolute;
  top: 88px;
  left: 50%;
  z-index: 9;
  display: inline-flex;
  gap: var(--space-2);
  padding: var(--space-2);
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(255, 255, 255, 0.76);
  box-shadow: var(--shadow-sm);
  transform: translateX(-50%);
}

.concentration-lab-panel .simulation-stage {
  inset: 142px var(--space-5) 190px;
}

.concentration-controls {
  grid-template-columns: repeat(5, minmax(0, 1fr)) auto;
}

/* =========================================================
  Game Layout
========================================================= */

.game-menu {
  display: none;
  min-height: calc(var(--design-height) - var(--header-height) - var(--space-8));
  place-items: center;
  padding: var(--space-10) var(--space-5);
}

.game-menu.is-active {
  display: grid;
}

.game-menu-content {
  width: 1180px;
  max-width: none;
  text-align: center;
}

.game-menu-content .eyebrow {
  color: var(--primary);
}

.game-menu-content .section-description {
  margin: var(--space-4) auto var(--space-10);
}

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

.level-card-wide {
  grid-column: span 2;
}

.game-play {
  width: calc(var(--design-width) - 40px);
  max-width: none;
  margin-inline: auto;
}

.game-status-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-6);
  border-radius: var(--radius-2xl);
  color: var(--color-white);
  background: linear-gradient(135deg, #2f78c9, #2563eb);
  box-shadow: var(--shadow-lg);
}

.game-status-bar p {
  color: var(--color-white);
  font-size: var(--text-lg);
  font-weight: 750;
}

.game-status-bar strong {
  color: var(--warning-soft);
  font-weight: 950;
}

.game-board {
  min-height: 650px;
  display: grid;
  grid-template-columns: 460px minmax(0, 1fr);
  gap: var(--space-6);
  align-items: stretch;
  margin-top: var(--space-5);
  padding: var(--space-5);
  border-radius: var(--radius-3xl);
  background: rgba(255, 253, 220, 0.82);
  border: 1px solid rgba(255, 255, 255, 0.76);
  box-shadow: var(--shadow-lg);
}

.game-visual-panel,
.game-challenge-panel {
  position: relative;
  min-height: 560px;
  border-radius: var(--radius-2xl);
  border: 1px solid var(--border-soft);
  background: rgba(255, 255, 255, 0.62);
  overflow: hidden;
}

.game-visual-panel {
  display: grid;
  place-items: center;
}

.game-visual-area {
  width: 100%;
  height: 100%;
  display: grid;
  place-items: center;
}

.game-challenge-panel {
  display: grid;
  place-items: center;
  padding: var(--space-6);
  text-align: center;
}

/* =========================================================
  Help Modal
========================================================= */

.help-modal {
  width: min(620px, calc(100vw - 2rem));
  max-height: calc(100vh - 2rem);
  margin: auto;
  background: transparent;
  color: var(--text-main);
}

.help-modal::backdrop {
  background: rgba(2, 6, 23, 0.58);
  backdrop-filter: blur(7px);
}

.modal-card {
  width: 100%;
  overflow: hidden;
  border-radius: var(--radius-2xl);
  background: var(--color-white);
  box-shadow: var(--shadow-xl);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-5);
  border-bottom: 1px solid var(--border-soft);
}

.modal-header h2 {
  font-size: var(--text-2xl);
}

.modal-body {
  display: grid;
  gap: var(--space-3);
  padding: var(--space-5);
}

.modal-body p {
  color: var(--text-muted);
  font-size: var(--text-lg);
  line-height: var(--leading-relaxed);
}

/* =========================================================
  Stable Responsive Behavior
  ---------------------------------------------------------
  Tampilan utama sengaja tidak diubah menjadi 1 kolom.
  Ukuran dikontrol oleh --app-scale di app.js/responsive-lock.css.
========================================================= */

@media (max-width: 1280px) {
  .app-shell,
  .app-header,
  .app-main,
  .home-screen {
    width: var(--design-width);
  }

  .workspace,
  .game-play {
    width: calc(var(--design-width) - 40px);
  }

  .workspace-two-columns {
    grid-template-columns: minmax(0, 930px) var(--side-panel-width);
  }

  .level-grid,
  .mode-card-grid-large {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 900px) {
  .home-content,
  .game-menu-content {
    width: 1180px;
  }

  .mode-card-grid,
  .mode-card-grid-large {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .workspace-two-columns {
    grid-template-columns: minmax(0, 930px) var(--side-panel-width);
  }

  .symbol-lab-panel,
  .game-board {
    grid-template-columns: 460px minmax(0, 1fr);
  }
}

@media (max-width: 760px) {
  body {
    overflow: auto;
  }

  .app-header {
    grid-template-columns: 210px minmax(0, 1fr) 142px;
  }

  .brand small {
    display: block;
  }

  .grid-controls,
  .concentration-controls {
    grid-template-columns: repeat(3, minmax(0, 1fr)) auto;
  }

  .experiment-control-panel {
    flex-direction: row;
  }

  .game-status-bar {
    display: flex;
    text-align: left;
  }
}