/* =========================================================
  AtomLab Interaktif - layout.css
  ---------------------------------------------------------
  Responsive upgrade:
  - Desktop/laptop: layout 2 kolom
  - Tablet: panel samping turun menjadi grid rapi
  - HP: layout 1 kolom yang nyaman dipakai
  - Tidak memakai fixed stage / auto scale
========================================================= */

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

html {
  width: 100%;
  min-height: 100%;
  overflow-x: hidden;
}

body {
  width: 100%;
  min-height: 100vh;
  overflow-x: hidden;
}

.app-shell {
  width: 100%;
  min-height: 100vh;
  position: relative;
  isolation: isolate;
  transform: none;
}

.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: 100%;
  min-height: 100vh;
  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: 0.85;
}

.orb-blue {
  width: 44rem;
  height: 44rem;
  left: -16rem;
  top: -18rem;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.38), transparent 64%);
}

.orb-yellow {
  width: 36rem;
  height: 36rem;
  right: -12rem;
  bottom: -15rem;
  background: radial-gradient(circle, rgba(250, 204, 21, 0.24), transparent 66%);
}

.orb-green {
  width: 28rem;
  height: 28rem;
  right: 18%;
  top: 4rem;
  background: radial-gradient(circle, rgba(34, 197, 94, 0.14), transparent 70%);
}

.home-content {
  width: min(1120px, 100%);
  margin-inline: auto;
  text-align: center;
  position: relative;
  z-index: 1;
}

.home-title {
  margin-bottom: var(--space-5);
  color: var(--color-white);
  letter-spacing: -0.07em;
}

.home-subtitle {
  max-width: 760px;
  margin: 0 auto var(--space-12);
  color: rgba(255, 255, 255, 0.76);
  font-size: clamp(var(--text-base), 2vw, var(--text-xl));
  line-height: var(--leading-relaxed);
}

.mode-card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(var(--space-4), 2.5vw, var(--space-8));
  align-items: stretch;
}

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

.app-header {
  width: 100%;
  min-height: var(--header-height);
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  display: grid;
  grid-template-columns: minmax(210px, 1fr) auto minmax(180px, 1fr);
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-3) clamp(var(--space-4), 2vw, var(--space-6));
  background: rgba(255, 255, 255, 0.78);
  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);
  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);
  max-width: 100%;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.tab-button {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0 var(--space-4);
  border-radius: var(--radius-lg);
  color: var(--color-slate-600);
  background: transparent;
  box-shadow: none;
  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-3);
}

/* =========================================================
  Main Content Container
========================================================= */

.app-main {
  width: 100%;
  min-height: calc(100vh - var(--header-height));
  padding: clamp(var(--space-3), 2vw, var(--space-6));
  overflow: visible;
}

.workspace {
  width: min(var(--container-max), 100%);
  margin-inline: auto;
}

.workspace-two-columns {
  display: grid;
  grid-template-columns: minmax(620px, 1fr) var(--side-panel-width);
  gap: clamp(var(--space-4), 2vw, var(--space-6));
  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: 735px;
  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);
}

/* =========================================================
  Atom Mode Layout
========================================================= */

.atom-lab-panel {
  background:
    radial-gradient(circle at 50% 42%, rgba(96, 165, 250, 0.14), transparent 34%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(240, 249, 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;
}

.atom-stage {
  position: absolute;
  inset: 86px 0 160px;
  display: grid;
  place-items: center;
}

.particle-tray-row {
  position: absolute;
  left: 0;
  right: 0;
  bottom: var(--space-6);
  z-index: 10;
  display: flex;
  justify-content: center;
  align-items: flex-end;
  gap: clamp(var(--space-3), 2vw, var(--space-6));
  padding-inline: var(--space-5);
}

/* =========================================================
  Symbol Mode Layout
========================================================= */

.symbol-lab-panel {
  min-height: 735px;
  display: grid;
  grid-template-columns: minmax(380px, 1fr) minmax(300px, 380px);
  gap: var(--space-5);
  padding: var(--space-5);
  background:
    radial-gradient(circle at 30% 42%, rgba(96, 165, 250, 0.14), transparent 35%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(255, 251, 235, 0.82));
}

.symbol-atom-area {
  min-height: 640px;
  position: relative;
  display: grid;
  place-items: center;
  overflow: hidden;
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-2xl);
  background: rgba(255, 255, 255, 0.56);
}

.floating-counter {
  position: absolute;
  top: var(--space-4);
  left: var(--space-4);
  z-index: 8;
}

.symbol-editor-area {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: var(--space-5);
  min-width: 0;
}

.action-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
}

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

.game-menu {
  display: none;
  min-height: calc(100vh - var(--header-height) - var(--space-12));
  place-items: center;
  padding: clamp(var(--space-6), 4vw, var(--space-12));
}

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

.game-menu-content {
  width: min(1120px, 100%);
  text-align: center;
}

.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: clamp(var(--space-4), 2vw, var(--space-6));
}

.game-play {
  width: min(var(--container-max), 100%);
  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: clamp(var(--text-base), 2vw, var(--text-2xl));
  font-weight: 750;
}

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

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

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

.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);
}

/* =========================================================
  Responsive Layout
========================================================= */

/* Laptop kecil */
@media (max-width: 1280px) {
  :root {
    --side-panel-width: 380px;
  }

  .workspace-two-columns {
    grid-template-columns: minmax(560px, 1fr) var(--side-panel-width);
  }

  .level-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .game-board {
    grid-template-columns: 420px minmax(0, 1fr);
  }
}

/* Tablet landscape / laptop sempit */
@media (max-width: 1120px) {
  .app-header {
    grid-template-columns: 1fr;
    justify-items: stretch;
  }

  .brand,
  .header-actions {
    justify-content: center;
  }

  .main-tabs {
    width: 100%;
    justify-content: flex-start;
  }

  .workspace-two-columns {
    grid-template-columns: 1fr;
  }

  .side-panel-stack {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .symbol-lab-panel {
    grid-template-columns: 1fr;
  }

  .symbol-atom-area {
    min-height: 540px;
  }

  .game-board {
    grid-template-columns: 1fr;
  }

  .game-atom-panel,
  .game-challenge-panel {
    min-height: 500px;
  }
}

/* Tablet portrait */
@media (max-width: 900px) {
  .mode-card-grid {
    grid-template-columns: 1fr;
  }

  .home-content {
    max-width: 620px;
  }

  .side-panel-stack {
    grid-template-columns: 1fr;
  }

  .game-status-bar {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .game-status-bar .btn {
    grid-column: 1 / -1;
  }

  .level-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* HP besar */
@media (max-width: 760px) {
  :root {
    --header-height: auto;
  }

  .home-screen {
    min-height: 100vh;
    padding: var(--space-6) var(--space-4);
  }

  .home-title {
    letter-spacing: -0.05em;
  }

  .home-subtitle {
    margin-bottom: var(--space-8);
  }

  .app-header {
    position: relative;
    gap: var(--space-3);
    padding: var(--space-3);
  }

  .brand {
    justify-content: flex-start;
  }

  .brand-icon {
    width: 40px;
    min-width: 40px;
    height: 40px;
  }

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

  .brand small {
    display: none;
  }

  .header-actions {
    justify-content: stretch;
  }

  .header-actions .btn {
    flex: 1;
  }

  .app-main {
    padding: var(--space-3);
  }

  .lab-panel {
    min-height: 860px;
  }

  .lab-toolbar {
    position: static;
    padding: var(--space-4);
    flex-direction: column;
  }

  .atom-stage {
    inset: 165px 0 310px;
  }

  .particle-tray-row {
    flex-direction: column;
    align-items: center;
    bottom: var(--space-4);
    gap: var(--space-5);
  }

  .symbol-lab-panel {
    min-height: auto;
    padding: var(--space-3);
  }

  .symbol-atom-area {
    min-height: 460px;
  }

  .floating-counter {
    position: static;
    width: 100%;
    margin-bottom: var(--space-3);
  }

  .game-board {
    padding: var(--space-3);
    gap: var(--space-3);
  }

  .game-atom-panel,
  .game-challenge-panel {
    min-height: 430px;
  }

  .level-grid {
    grid-template-columns: 1fr;
  }
}

/* HP kecil */
@media (max-width: 520px) {
  .main-tabs {
    gap: 0;
  }

  .tab-button {
    padding-inline: var(--space-3);
    font-size: var(--text-sm);
  }

  .game-status-bar {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .action-row {
    flex-direction: column;
    align-items: stretch;
  }

  .action-row .btn {
    width: 100%;
  }

  .home-title {
    font-size: clamp(2.7rem, 14vw, 4rem);
  }

  .home-subtitle {
    font-size: var(--text-base);
  }
}