/* ═══════════════════════════════════════════════════════════
   EQUITY STORY — style.css
   Dark-mode puzzle UI with isometric depth illusion
   Grid: 9 columns × 3 rows = 27 sub-cube slots
   ═══════════════════════════════════════════════════════════ */

/* ── Reset & custom properties ──────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:        #0c0c11;
  --surface:   #15151e;
  --surface2:  #1e1e2a;
  --border:    #2a2a3a;
  --border2:   #3a3a50;

  /* Accent colours */
  --accent:    #7c5cfc;   /* violet  — Foundation layer */
  --pink:      #fc5c7d;   /* pink    — Solution layer   */
  --cyan:      #22b8d6;   /* cyan    — Business layer   */
  --success:   #22d69a;
  --warn:      #fbbf24;

  /* Text */
  --text:      #e8e8f2;
  --text-dim:  #7777aa;

  /* Cube dimensions */
  --cube-size: 74px;
  --gap:       6px;
  --radius:    6px;

  /* Transitions */
  --t:         0.22s cubic-bezier(.4,0,.2,1);
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ── Header ─────────────────────────────────────────────── */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 22px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  gap: 14px;
  flex-wrap: wrap;
}
.header-brand { display: flex; align-items: center; gap: 9px; }
.header-brand h1 {
  font-size: 1.25rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent) 30%, var(--pink));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.logo { font-size: 1.3rem; }
.header-controls { display: flex; align-items: center; gap: 9px; flex-wrap: wrap; }

/* Story selector */
#story-select {
  background: var(--surface2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 6px 10px;
  font-size: 0.85rem;
  cursor: pointer;
  outline: none;
  transition: border-color var(--t);
  max-width: 160px;
}
#story-select:hover,
#story-select:focus { border-color: var(--accent); }

/* ── Buttons ────────────────────────────────────────────── */
.btn {
  padding: 7px 15px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--t);
  white-space: nowrap;
}
.btn-primary   { background: var(--accent); color: #fff; }
.btn-primary:hover   { background: #6848e8; transform: translateY(-1px); }
.btn-secondary { background: var(--surface2); color: var(--text); border-color: var(--border); }
.btn-secondary:hover { border-color: var(--accent); }
.btn-ghost     { background: transparent; color: var(--text-dim); border-color: var(--border); }
.btn-ghost:hover     { color: var(--text); border-color: var(--text-dim); }

/* ── Progress bar ───────────────────────────────────────── */
.progress-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 7px 22px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.progress-bar {
  flex: 1;
  height: 5px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--success));
  border-radius: 3px;
  transition: width 0.4s ease;
}
.progress-label {
  font-size: 0.72rem;
  color: var(--text-dim);
  min-width: 110px;
  text-align: right;
}

/* ── Main Content ───────────────────────────────────────── */
.main-content {
  max-width: 1000px;
  margin: 0 auto;
  padding: 22px 16px 80px;
}

/* Story title input */
.story-title-wrap { margin-bottom: 22px; }
.story-title-input {
  width: 100%;
  background: transparent;
  color: var(--text);
  border: none;
  border-bottom: 2px solid var(--border);
  font-size: 1.6rem;
  font-weight: 700;
  padding: 4px 0;
  outline: none;
  transition: border-color var(--t);
}
.story-title-input:focus { border-color: var(--accent); }
.story-title-input::placeholder { color: var(--border2); }

/* ── Board section ──────────────────────────────────────── */
.board-section { margin-bottom: 32px; }

/* Layer labels above grid */
.board-labels {
  display: grid;
  grid-template-columns: repeat(3, calc(3 * var(--cube-size) + 2 * var(--gap)));
  gap: calc(var(--gap) + 10px);
  margin-bottom: 7px;
  padding-left: 14px;
}
.board-labels span {
  text-align: center;
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-dim);
}

/* ── Puzzle Board: 9×3 CSS grid ─────────────────────────── */
.puzzle-board {
  display: grid;
  grid-template-columns: repeat(3, var(--cube-size)) 10px repeat(3, var(--cube-size)) 10px repeat(3, var(--cube-size));
  grid-template-rows: repeat(3, var(--cube-size));
  gap: var(--gap);
  column-gap: var(--gap);

  /* Isometric perspective tilt for depth illusion */
  transform: perspective(1000px) rotateX(7deg);
  transform-origin: center top;

  /* Board card */
  width: fit-content;
  margin: 0 auto;
  padding: 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow:
    0 4px 40px rgba(124, 92, 252, 0.12),
    0 1px 0 rgba(255,255,255,0.03) inset;
}

/* Layer divider columns (the 10px gaps at grid position 4 and 8) */
.layer-divider {
  width: 10px;
  align-self: stretch;
  background: linear-gradient(to bottom, transparent, var(--border), transparent);
  border-radius: 2px;
  pointer-events: none;
}

/* ── Board Slot ─────────────────────────────────────────── */
.slot {
  width: var(--cube-size);
  height: var(--cube-size);
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  transition: border-color var(--t), background var(--t), box-shadow var(--t);
  /* Subtle layer tint via data attribute */
}
.slot[data-layer="0"] { background: rgba(124,92,252, 0.05); }
.slot[data-layer="1"] { background: rgba(252, 92,125, 0.05); }
.slot[data-layer="2"] { background: rgba( 34,184,214, 0.05); }

/* Slot number hint (tiny, bottom-right) */
.slot::after {
  content: attr(data-num);
  position: absolute;
  font-size: 0.55rem;
  color: var(--border2);
  bottom: 3px;
  right: 5px;
  pointer-events: none;
}

/* Drop-valid highlight */
.slot.drag-over {
  border-color: var(--success);
  background: rgba(34, 214, 154, 0.13) !important;
  box-shadow: 0 0 18px rgba(34, 214, 154, 0.35);
}
/* Drop-invalid highlight */
.slot.drag-over-reject {
  border-color: var(--pink);
  background: rgba(252, 92, 125, 0.1) !important;
}

/* ── Sub-cube (draggable piece) ─────────────────────────── */
.subcube {
  width: var(--cube-size);
  height: var(--cube-size);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 6px 4px;

  font-size: 0.64rem;
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: 0.01em;
  color: #fff;

  cursor: grab;
  user-select: none;
  -webkit-user-select: none;

  position: relative;
  transition:
    transform var(--t),
    box-shadow var(--t),
    opacity var(--t);

  /* 3D depth effect via box-shadow layers */
  box-shadow:
    0 2px 0 rgba(0,0,0,0.5),
    0 4px 14px rgba(0,0,0,0.35),
    inset 0 1px 0 rgba(255,255,255,0.18);
}

/* Layer colour palettes */
.subcube[data-layer="0"] {
  background: linear-gradient(145deg, #8b6ffd 0%, #5b3fcf 100%);
  border: 1px solid #9a80fe;
}
.subcube[data-layer="1"] {
  background: linear-gradient(145deg, #fd6e8d 0%, #c43060 100%);
  border: 1px solid #fe85a0;
}
.subcube[data-layer="2"] {
  background: linear-gradient(145deg, #29c8e8 0%, #1a86a0 100%);
  border: 1px solid #3ddaf4;
}

/* Hover lift */
.subcube:hover {
  transform: translateY(-4px) scale(1.04);
  box-shadow:
    0 7px 0 rgba(0,0,0,0.4),
    0 12px 28px rgba(0,0,0,0.45),
    inset 0 1px 0 rgba(255,255,255,0.22);
  z-index: 20;
}
.subcube:active { cursor: grabbing; transform: scale(0.97); }

/* While being dragged (HTML5 drag) */
.subcube.is-dragging { opacity: 0.35; cursor: grabbing; }

/* Placed inside a board slot */
.subcube.placed {
  cursor: grab;
  /* No random tray rotation when placed */
  transform: none !important;
}
.subcube.placed:hover {
  transform: translateY(-2px) scale(1.02) !important;
}

/* ── Tray ───────────────────────────────────────────────── */
.tray-section { margin-top: 8px; }
.tray-title {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  margin-bottom: 12px;
}
.tray-count { font-weight: 400; }

.tray {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  min-height: 110px;
  padding: 16px;
  background: var(--surface);
  border: 2px dashed var(--border);
  border-radius: 12px;
  transition: border-color var(--t), background var(--t);
  align-items: flex-start;
  align-content: flex-start;
}
.tray.drag-over {
  border-color: var(--accent);
  background: rgba(124, 92, 252, 0.06);
}
.tray-empty-hint {
  color: var(--border2);
  font-size: 0.8rem;
  font-style: italic;
  align-self: center;
  margin: auto;
}

/* ── Win Overlay ────────────────────────────────────────── */
.win-overlay {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  background: rgba(0,0,0,0.72);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.win-overlay.hidden { display: none; }

.confetti-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}
.win-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border2);
  border-radius: 22px;
  padding: 50px 44px;
  text-align: center;
  max-width: 430px;
  width: 90%;
  box-shadow:
    0 24px 80px rgba(124,92,252,0.35),
    0 0 0 1px rgba(255,255,255,0.04) inset;
  z-index: 1;
}
.win-icon { font-size: 3.5rem; margin-bottom: 16px; }
.win-card h2 { font-size: 1.75rem; font-weight: 800; margin-bottom: 8px; }
.win-subtitle { color: var(--accent); font-weight: 700; font-size: 1rem; margin-bottom: 10px; }
.win-body { color: var(--text-dim); margin-bottom: 28px; }
.win-actions { display: flex; gap: 12px; justify-content: center; }

/* ── Modal ──────────────────────────────────────────────── */
.modal {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 900;
}
.modal.hidden { display: none; }
.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}
.modal-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border2);
  border-radius: 18px;
  padding: 36px 32px;
  width: min(460px, 92vw);
  z-index: 1;
  box-shadow: 0 16px 60px rgba(0,0,0,0.5);
}
.modal-card h2 { font-size: 1.3rem; font-weight: 700; margin-bottom: 22px; }
.modal-card label {
  display: block;
  font-size: 0.75rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.09em;
  margin-bottom: 7px;
}
.modal-input {
  width: 100%;
  background: var(--surface2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 14px;
  font-size: 1rem;
  outline: none;
  margin-bottom: 26px;
  transition: border-color var(--t);
}
.modal-input:focus { border-color: var(--accent); }
.modal-actions { display: flex; gap: 10px; justify-content: flex-end; }

/* ── Toast ──────────────────────────────────────────────── */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 2000;
}
.toast {
  background: var(--surface2);
  border: 1px solid var(--border2);
  border-radius: var(--radius);
  padding: 10px 16px;
  font-size: 0.85rem;
  max-width: 290px;
  animation: toastIn 0.28s ease;
}
.toast.success { border-color: var(--success); }
.toast.error   { border-color: var(--pink); }
@keyframes toastIn  { from { transform: translateX(110%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }
@keyframes toastOut { from { transform: translateX(0);    opacity: 1; } to { transform: translateX(110%); opacity: 0; } }

/* ── Touch/mouse drag ghost ─────────────────────────────── */
#drag-ghost {
  position: fixed;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.88;
  transform: rotate(-4deg) scale(1.08);
}

/* ── Responsive ─────────────────────────────────────────── */
@media (max-width: 780px) {
  :root { --cube-size: 56px; --gap: 4px; }
  .puzzle-board {
    transform: none;
    grid-template-columns: repeat(3, var(--cube-size)) 6px repeat(3, var(--cube-size)) 6px repeat(3, var(--cube-size));
  }
  .board-labels {
    grid-template-columns: repeat(3, calc(3 * var(--cube-size) + 2 * var(--gap)));
    gap: calc(var(--gap) + 6px);
  }
  .app-header { padding: 9px 14px; }
  .main-content { padding: 16px 10px 60px; }
}
@media (max-width: 520px) {
  :root { --cube-size: 42px; --gap: 3px; }
  .subcube { font-size: 0.48rem; padding: 3px 2px; }
  .header-brand h1 { font-size: 1rem; }
  .btn { padding: 6px 10px; font-size: 0.78rem; }
  .board-labels { display: none; }
}

/* ── Utility ────────────────────────────────────────────── */
.hidden { display: none !important; }