:root {
  --pri: #2563eb;
  --ok: #16a34a;
  --err: #dc2626;
  --muted: #e5e7eb;
  --chip: #111827;
  --bg: #f8fafc;
}
* {
  box-sizing: border-box;
}
body::-webkit-scrollbar {
  display: none;
}

/* === NAVBAR FIXED AT TOP === */
.custom-navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: rgba(6, 5, 5, 0.35);
  opacity: 0.9;
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(47, 32, 72, 0.1);
  padding: 12px 25px;
  transition: background 0.3s ease;
  z-index: 1001;
}

.custom-navbar.scrolled {
  background: rgba(0, 0, 0, 0.75);
}

.navbar-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 15px;
}

.logo img {
  height: 50px;
  filter: drop-shadow(0 0 4px rgba(0, 0, 0, 0.5));
}

/* Chatbot icon */
.chatbot img {
  width: 35px;
  height: 35px;
  cursor: pointer;
}

/* Hamburger */
.hamburger {
  cursor: pointer;
  width: 30px;
  height: 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  margin-top: 1px;
  margin-bottom: 3px;
}

.hamburger span {
  height: 3px;
  background: white;
  border-radius: 3px;
  transition: all 0.3s ease;
}

.hamburger.open span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.hamburger.open span:nth-child(2) {
  opacity: 0;
}
.hamburger.open span:nth-child(3) {
  transform: rotate(-45deg) translate(6px, -6px);
}

/* side menu */
.side-menu {
  position: fixed;
  top: 0;
  right: -300px;
  height: 100vh;
  width: 300px;
  background: linear-gradient(
    180deg,
    rgba(18, 18, 30, 0.98) 0%,
    rgba(10, 10, 18, 0.95) 100%
  );
  backdrop-filter: blur(8px);
  padding: 80px 25px;
  display: flex;
  flex-direction: column;
  gap: 25px;
  transition: right 0.4s cubic-bezier(0.77, 0, 0.175, 1), opacity 0.3s ease;
  opacity: 0;
  z-index: 1000;
  box-shadow: -5px 0 20px rgba(0, 0, 0, 0.6);
  font-family: "Baloo 2", sans-serif;
}

.side-menu.active {
  right: 0;
  opacity: 1;
}

/* Link Style */
.side-menu a {
  position: relative;
  color: #ddd;
  text-decoration: none;
  letter-spacing: 0.5px;
  padding: 8px 0;
  transition: color 0.3s ease;
  font-size: 1.2rem;
  font-weight: 600;
}

.side-menu .menu-icon,
.side-menu .menu-icon2,
.side-menu .menu-icon3 {
  margin-right: 0.8rem;
  margin-bottom: -2px;
}

.side-menu .menu-icon {
  width: 1.5rem;
}
.side-menu .menu-icon2 {
  width: 1.3rem;
}
.side-menu .menu-icon3 {
  width: 1.4rem;
}

/* Hover animasi */
.side-menu a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  height: 2px;
  width: 0%;
  background: linear-gradient(90deg, #a78bfa, #8b5cf6, #4c1d95);
  box-shadow: 0 0 6px #8b5cf6;
  transition: width 0.3s ease;
}

.side-menu a:hover {
  color: #c4b5fd;
}

.side-menu a:hover::after {
  width: 100%;
}

/* Entrance animation */
.side-menu.active a {
  animation: slideFadeIn 0.4s ease forwards;
}
.side-menu.active a:nth-child(1) {
  animation-delay: 0.1s;
}
.side-menu.active a:nth-child(2) {
  animation-delay: 0.2s;
}
.side-menu.active a:nth-child(3) {
  animation-delay: 0.3s;
}
.side-menu.active a:nth-child(4) {
  animation-delay: 0.4s;
}

@keyframes slideFadeIn {
  from {
    transform: translateX(20px);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

body {
  margin: 0;
  background: linear-gradient(
    to bottom,
    rgb(7, 0, 11) 0%,
    rgba(29, 3, 49, 1) 100%
  );
  font-family: "Baloo 2", sans-serif;
  min-height: 100vh;
}

#starsCanvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
}
.page-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 80px);
  padding-top: 80px;
}

.shell {
  backdrop-filter: blur(10px);
  width: min(960px, 95vw);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 16px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
  padding: 20px;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 18px;
  min-height: 80vh;
  margin-top: 1rem;
}

header {
  grid-column: 1/-1;
}
h1 {
  margin: 0 0 6px;
  font-size: 1.6rem;
  color: white;
}
.sub {
  color: #ffffff;
  font-size: 0.95rem;
}

/* progress */
.progress {
  height: 12px;
  width: 100%;
  background: rgb(83, 80, 80);
  border-radius: 999px;
  overflow: hidden;
  margin-top: 12px;
  margin-bottom: 1rem;
}
.bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--pri), #22c55e);
  transition: width 0.3s;
}

/* left: game board */
.card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(6px);
  border-radius: 14px;
  display: flex;
  flex-direction: column;
  padding: 16px;
  gap: 14px;
}
.prompt {
  background: #fff;
  border: 1px dashed #cbd5e1;
  border-radius: 12px;
  padding: 14px;
  font-family: "Baloo 2", sans-serif;
  line-height: 1.8;
  overflow-x: auto;
}
.slots {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}
.slot {
  min-width: 90px;
  min-height: 36px;
  background: #fff;
  border: 2px dashed #94a3b8;
  border-radius: 10px;
  padding: 6px 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #64748b;
  font-family: "Baloo 2", sans-serif;
  user-select: none;
}
.slot.filled {
  border-style: solid;
  border-color: #94a3b8;
  color: #0f172a;
}
.slot.correct {
  border-color: var(--ok);
  background: #dcfce7;
}
.slot.wrong {
  border-color: var(--err);
  background: #fee2e2;
}

/* bank */
.bank {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.chip {
  background: var(--chip);
  color: #fff;
  padding: 8px 12px;
  border-radius: 999px;
  font-family: "Baloo 2", sans-serif;
  cursor: grab;
  user-select: none;
}
.chip:active {
  cursor: grabbing;
  transform: scale(0.98);
}

.reset-btn {
  background-color: var(--pri);
  color: white;
}

/* actions + feedback */
.actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
button {
  border: 0;
  border-radius: 10px;
  padding: 10px 14px;
  font-weight: 600;
  cursor: pointer;
}
.primary {
  background: var(--pri);
  color: #fff;
}
.ghost {
  background: #e2e8f0;
  color: #0f172a;
}
.success {
  background: var(--ok);
  color: #fff;
}
.danger {
  background: var(--err);
  color: #fff;
}
.msg {
  font-weight: 700;
}
.msg.ok {
  color: var(--ok);
}
.msg.err {
  color: var(--err);
}
.hidden {
  display: none;
}

/* right: sidebar */
.side {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.stat {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 5px 5px rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(6px);
  border-radius: 14px;
  padding: 14px;
}
.stat h3 {
  margin: 0.2rem 0 0.6rem;
  font-size: 1.05rem;
  color: white;
}

.stat li {
  color: white;
}
.list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}
.pill {
  border-radius: 999px;
  padding: 8px;
  text-align: center;
  font-weight: 700;
  background: #e5e7eb;
}
.pill.done {
  background: #dcfce7;
  color: #166534;
}
.badge {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(6px);
  border-radius: 12px;
  padding: 12px;
  color: white;
}
.badge .icon {
  font-size: 24px;
}

.popup-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
}

.popup-card {
  background: #fff;
  border-radius: 1rem;
  padding: 2rem;
  text-align: center;
  width: 90%;
  max-width: 400px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.25);
  animation: pop 0.3s ease;
}

.popup-card h2 {
  margin-bottom: 1rem;
  color: #0f172a;
}

.popup-card button {
  margin-top: 1rem;
  padding: 0.7rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  background: #2563eb;
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

.popup-card button:hover {
  background: #1e40af;
}

@keyframes pop {
  from {
    transform: scale(0.8);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

/* responsive */
@media (max-width: 767px) {
  /* Navbar */
  .custom-navbar {
    padding: 10px 15px;
  }
  .logo img {
    height: 40px;
  }
  .chatbot img {
    width: 28px;
    height: 28px;
  }

  .shell {
    grid-template-columns: 1fr;
    min-height: 95vh;
  }

  .reset-btn {
    margin-top: 10px;
    padding: 10px 14px;
    border: none;
    background: var(--pri);
    color: #fff;
    border-radius: 8px;
    cursor: pointer;
    font-weight: bold;
  }
  .reset-btn:hover {
    background: #c0392b;
  }
}

/* === FINAL FIX iPhone SE (≤375px) === */
@media (max-width: 375px) {
  .shell {
    display: flex !important;
    flex-direction: column !important;
    width: 100% !important;
    max-width: 100% !important;
    padding: 10px !important;
    gap: 12px !important;
  }

  h1 {
    font-size: 1rem !important;
    margin-bottom: 4px;
  }
  .sub {
    font-size: 0.75rem !important;
    margin-bottom: 8px;
  }

  .prompt {
    font-size: 0.8rem !important;
    padding: 8px !important;
    line-height: 1.4;
  }

  #pillWrap {
    display: flex !important;
    flex-wrap: nowrap !important;
    overflow-x: auto !important;
    gap: 5px !important;
    padding: 4px 2px !important;
    max-width: 100% !important;
  }
  #pillWrap .pill {
    flex: 0 0 auto !important;
    width: 30px !important;
    height: 30px !important;
    font-size: 0.7rem !important;
  }

  .slot {
    width: 100% !important;
    min-height: 36px !important;
    font-size: 0.75rem !important;
    padding: 6px !important;
    margin-bottom: 6px !important;
  }

  .chip {
    flex: 1 1 48% !important;
    font-size: 0.75rem !important;
    padding: 6px !important;
    margin: 3px !important;
    text-align: center !important;
  }

  .reset-btn {
    width: 100% !important;
    font-size: 0.8rem !important;
    padding: 8px !important;
    margin-top: 8px !important;
  }
}

@media (max-width: 380px) {
  .shell {
    display: flex !important;
    flex-direction: column !important;
    padding: 12px !important;
    gap: 12px !important;
    min-height: auto !important;
  }

  h1 {
    font-size: 1.2rem !important;
    text-align: center !important;
  }

  .sub {
    font-size: 0.8rem !important;
    text-align: center !important;
  }

  .progress {
    height: 8px !important;
  }

  .bank {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    justify-content: center;
  }

  .chip {
    font-size: 0.8rem !important;
    padding: 6px 10px !important;
  }

  .slot {
    min-width: 70px !important;
    min-height: 30px !important;
    font-size: 0.8rem !important;
  }

  aside.side {
    width: 100% !important;
    padding: 10px !important;
  }

  #pillWrap {
    max-width: 100% !important;
    overflow-x: auto !important;
    flex-wrap: nowrap !important;
    justify-content: flex-start !important;
  }

  .pill {
    min-width: 32px !important;
    font-size: 0.7rem !important;
    margin: 2px !important;
    padding: 4px 6px !important;
  }

  .actions button,
  .reset-btn,
  #btnPrev {
    width: 100% !important;
    font-size: 0.8rem !important;
    margin: 4px 0 !important;
  }
}