/* =============================================================
   Puzzle Feed Generator — Dark Slate Theme
   ============================================================= */

:root {
  --bg-void:        #0b0e14;
  --bg-base:        #10141c;
  --bg-panel:       #161b26;
  --bg-panel-alt:   #1c2230;
  --bg-tile:        #1e2432;

  --border-soft:    #262d3d;
  --border-strong:  #333c50;

  --text-primary:   #e8ebf2;
  --text-secondary: #9aa4b8;
  --text-muted:     #5f6a80;

  --accent:         #6366f1;
  --accent-hover:   #7477f5;
  --accent-soft:    rgba(99, 102, 241, 0.15);
  --accent-glow:    rgba(99, 102, 241, 0.35);

  --success:        #34d399;
  --danger:          #f87171;

  --grid-size: 3;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;

  --shadow-panel: 0 20px 50px rgba(0, 0, 0, 0.45);
  --transition-fast: 150ms ease;
  --transition-med: 260ms cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}

body {
  background:
    radial-gradient(circle at 15% 0%, rgba(99, 102, 241, 0.10), transparent 45%),
    radial-gradient(circle at 85% 100%, rgba(99, 102, 241, 0.06), transparent 45%),
    var(--bg-void);
  color: var(--text-primary);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  padding: 32px 16px 64px;
}

.app-shell {
  width: 100%;
  max-width: 620px;
  display: flex;
  flex-direction: column;
  gap: 22px;
}

/* ---------------------- Header ---------------------- */
.app-header {
  text-align: center;
  padding: 8px 0 4px;
}

.brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.brand-icon {
  color: var(--accent);
  font-size: 22px;
}

.app-header h1 {
  font-size: 26px;
  font-weight: 700;
  margin: 0;
  letter-spacing: -0.02em;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 14px;
  margin: 8px 0 0;
}

/* ---------------------- Panel ---------------------- */
.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-panel);
}

/* ---------------------- Dropzone ---------------------- */
.dropzone {
  position: relative;
  border: 2px dashed var(--border-strong);
  border-radius: var(--radius-md);
  min-height: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  overflow: hidden;
  background: var(--bg-panel-alt);
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.dropzone:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.dropzone.dragover {
  border-color: var(--accent);
  background: var(--accent-soft);
  box-shadow: 0 0 0 4px var(--accent-glow);
}

.dropzone.has-image {
  border-style: solid;
  border-color: var(--border-soft);
  cursor: pointer;
}

.dropzone-content {
  text-align: center;
  padding: 24px;
  color: var(--text-secondary);
}

.dropzone-icon {
  display: inline-block;
  font-size: 26px;
  color: var(--accent);
  margin-bottom: 8px;
}

.dropzone-title {
  color: var(--text-primary);
  font-weight: 600;
  margin: 4px 0;
}

.dropzone-sub {
  font-size: 13px;
  margin: 2px 0;
}

.dropzone-hint {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 10px;
}

.preview-img {
  width: 100%;
  max-height: 320px;
  object-fit: contain;
  display: block;
}

/* ---------------------- Controls row ---------------------- */
.controls-row {
  display: flex;
  align-items: flex-end;
  gap: 14px;
  margin-top: 20px;
}

.control-group {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.control-group label {
  font-size: 12px;
  color: var(--text-secondary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

select {
  appearance: none;
  background: var(--bg-tile) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%239aa4b8' stroke-width='1.5' fill='none' fill-rule='evenodd'/%3E%3C/svg%3E") no-repeat right 14px center;
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 11px 36px 11px 14px;
  font-size: 14px;
  cursor: pointer;
  transition: border-color var(--transition-fast);
}

select:hover, select:focus {
  border-color: var(--accent);
  outline: none;
}

/* ---------------------- Buttons ---------------------- */
.btn {
  border: none;
  border-radius: var(--radius-sm);
  padding: 12px 20px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition-fast), background var(--transition-fast), opacity var(--transition-fast), box-shadow var(--transition-fast);
  white-space: nowrap;
}

.btn:active { transform: scale(0.97); }

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 8px 20px var(--accent-glow);
}

.btn-primary:not(:disabled):hover {
  background: var(--accent-hover);
}

.btn-secondary {
  background: var(--bg-tile);
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
}

.btn-secondary:hover {
  border-color: var(--accent);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-soft);
}

.btn-ghost:hover {
  color: var(--text-primary);
  border-color: var(--border-strong);
}

/* ---------------------- Error message ---------------------- */
.error-msg {
  margin: 16px 0 0;
  padding: 12px 14px;
  background: rgba(248, 113, 113, 0.1);
  border: 1px solid rgba(248, 113, 113, 0.35);
  color: var(--danger);
  border-radius: var(--radius-sm);
  font-size: 13px;
}

/* ---------------------- Game panel ---------------------- */
.game-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 18px;
  flex-wrap: wrap;
}

.toolbar-right {
  display: flex;
  gap: 10px;
}

.board-wrapper {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-soft);
  background: var(--bg-base);
}

.puzzle-board {
  display: grid;
  grid-template-columns: repeat(var(--grid-size), 1fr);
  grid-template-rows: repeat(var(--grid-size), 1fr);
  gap: 2px;
  width: 100%;
  height: 100%;
  background: var(--border-soft);
}

.puzzle-tile {
  position: relative;
  background-size: cover;
  background-position: center;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), filter var(--transition-fast);
  user-select: none;
}

.puzzle-tile:hover {
  filter: brightness(1.08);
}

.puzzle-tile.selected {
  outline: 3px solid var(--accent);
  outline-offset: -3px;
  z-index: 2;
  box-shadow: 0 0 18px var(--accent-glow);
}

.puzzle-tile.dragging {
  opacity: 0.35;
}

.puzzle-tile.drag-over {
  outline: 3px dashed var(--accent-hover);
  outline-offset: -3px;
}

.puzzle-tile.correct::after {
  content: "";
  position: absolute;
  inset: 0;
  box-shadow: inset 0 0 0 2px var(--success);
  pointer-events: none;
}

.peek-overlay {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 5;
}

.game-hint {
  text-align: center;
  color: var(--text-muted);
  font-size: 12.5px;
  margin: 14px 0 0;
}

/* ---------------------- Modal ---------------------- */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(6, 8, 14, 0.72);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 20px;
}

.modal-card {
  background: var(--bg-panel);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 34px 30px;
  max-width: 360px;
  width: 100%;
  text-align: center;
  box-shadow: 0 30px 70px rgba(0, 0, 0, 0.55);
  animation: pop-in var(--transition-med);
}

@keyframes pop-in {
  from { opacity: 0; transform: translateY(10px) scale(0.96); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-icon {
  font-size: 42px;
  margin-bottom: 8px;
}

.modal-card h2 {
  margin: 0 0 6px;
  font-size: 21px;
}

.modal-card p {
  color: var(--text-secondary);
  font-size: 14px;
  margin: 0 0 22px;
}

.modal-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---------------------- Loading overlay ---------------------- */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(6, 8, 14, 0.75);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  z-index: 150; /* Pastikan z-index dibawah modal (modal z-index: 200 / 100) */
}

/* Tambahkan rule ini di bagian paling bawah CSS agar elemen dengan atribut hidden benar-benar hilang */
[hidden] {
  display: none !important;
}

.spinner {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 3px solid var(--border-strong);
  border-top-color: var(--accent);
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-overlay p {
  color: var(--text-secondary);
  font-size: 13px;
}

/* ---------------------- Footer ---------------------- */
.app-footer {
  text-align: center;
  color: var(--text-muted);
  font-size: 12px;
  padding: 8px 0 0;
}

/* ---------------------- Responsive ---------------------- */
@media (max-width: 480px) {
  .panel { padding: 18px; }
  .controls-row { flex-direction: column; align-items: stretch; }
  .app-header h1 { font-size: 22px; }
  .game-toolbar { justify-content: center; }
}