:root {
  --bg: #05060d;
  --bg-panel: rgba(14, 17, 30, 0.82);
  --bg-panel-2: rgba(20, 23, 40, 0.9);
  --border: rgba(0, 229, 255, 0.35);
  --neon-blue: #00e5ff;
  --neon-blue-soft: #4bf0ff;
  --neon-red: #ff1053;
  --neon-red-soft: #ff5c86;
  --text: #eef6ff;
  --text-dim: #93a3c2;
  --radius: 18px;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-left: env(safe-area-inset-left, 0px);
  --safe-right: env(safe-area-inset-right, 0px);
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  overscroll-behavior: none;
  touch-action: manipulation;
}

body {
  background:
    radial-gradient(circle at 15% 10%, rgba(0, 229, 255, 0.16), transparent 40%),
    radial-gradient(circle at 85% 0%, rgba(255, 16, 83, 0.16), transparent 45%),
    radial-gradient(circle at 50% 100%, rgba(0, 229, 255, 0.08), transparent 50%),
    var(--bg);
  padding: calc(24px + var(--safe-top)) calc(24px + var(--safe-right)) calc(24px + var(--safe-bottom)) calc(24px + var(--safe-left));
  min-height: 100vh;
}

a { color: inherit; text-decoration: none; }

::selection { background: var(--neon-blue); color: #001018; }

h1, h2, h3 { margin: 0 0 6px; letter-spacing: 0.02em; }

.brand {
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: linear-gradient(90deg, var(--neon-blue), var(--neon-red));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 0 12px rgba(0, 229, 255, 0.45));
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.username {
  color: var(--text-dim);
  font-size: 14px;
}

/* ---------- Buttons ---------- */

.btn {
  appearance: none;
  border: none;
  cursor: pointer;
  font-weight: 700;
  font-size: 16px;
  letter-spacing: 0.02em;
  padding: 14px 22px;
  border-radius: 999px;
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: transform 0.12s ease, box-shadow 0.2s ease, opacity 0.2s ease;
  color: var(--text);
}

.btn:active { transform: scale(0.96); }

.btn-primary {
  background: linear-gradient(135deg, var(--neon-blue), #0088ff);
  color: #001018;
  box-shadow: 0 0 18px rgba(0, 229, 255, 0.55), 0 4px 18px rgba(0, 229, 255, 0.25);
}

.btn-danger {
  background: linear-gradient(135deg, var(--neon-red), #b0003a);
  color: #fff0f3;
  box-shadow: 0 0 18px rgba(255, 16, 83, 0.5), 0 4px 18px rgba(255, 16, 83, 0.2);
}

.btn-ghost {
  background: var(--bg-panel-2);
  border: 1px solid var(--border);
  color: var(--text);
}

.btn-ghost:hover { border-color: var(--neon-blue); }

.btn[disabled] { opacity: 0.5; pointer-events: none; }

.btn-block { width: 100%; }
.btn-sm { padding: 10px 16px; font-size: 14px; min-height: 40px; }

/* ---------- Panels / Cards ---------- */

.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  backdrop-filter: blur(10px);
}

.card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  transition: box-shadow 0.2s ease, border-color 0.2s ease, transform 0.15s ease;
}

.card:active { transform: scale(0.99); }

.quiz-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
  margin-top: 24px;
}

.quiz-card { position: relative; overflow: hidden; }
.quiz-card::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: var(--radius);
  padding: 1px;
  background: linear-gradient(135deg, var(--neon-blue), transparent 40%, var(--neon-red));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0.6;
  pointer-events: none;
}

.quiz-card h3 { font-size: 20px; }
.quiz-card .meta { color: var(--text-dim); font-size: 13px; margin-bottom: 16px; }
.quiz-card .actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 16px; }

.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-dim);
}

/* ---------- Forms ---------- */

.field { margin-bottom: 18px; }
.field label {
  display: block;
  margin-bottom: 8px;
  font-size: 13px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.field input[type="text"],
.field input[type="password"] {
  width: 100%;
  background: rgba(6, 8, 16, 0.8);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 16px;
  color: var(--text);
  font-size: 16px;
  min-height: 48px;
}

.field input:focus {
  outline: none;
  border-color: var(--neon-blue);
  box-shadow: 0 0 0 3px rgba(0, 229, 255, 0.2);
}

.error-msg {
  color: var(--neon-red-soft);
  background: rgba(255, 16, 83, 0.1);
  border: 1px solid rgba(255, 16, 83, 0.4);
  padding: 10px 14px;
  border-radius: 10px;
  margin-bottom: 16px;
  font-size: 14px;
}

/* ---------- Login ---------- */

.login-wrap {
  min-height: calc(100vh - 48px);
  display: flex;
  align-items: center;
  justify-content: center;
}

.login-box {
  width: min(420px, 100%);
  text-align: center;
}

.login-box .brand { display: block; margin-bottom: 6px; }
.login-box p.subtitle { color: var(--text-dim); margin-bottom: 28px; }
.login-box form { text-align: left; }

/* ---------- Photo grid (management view) ---------- */

.photo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 14px;
  margin-top: 20px;
}

.photo-tile {
  position: relative;
  border-radius: 14px;
  overflow: hidden;
  aspect-ratio: 1 / 1;
  border: 1px solid var(--border);
  background: #0a0c16;
}

.photo-tile img { width: 100%; height: 100%; object-fit: cover; display: block; }

.photo-tile .remove-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: rgba(5, 6, 13, 0.75);
  border: 1px solid var(--neon-red);
  color: var(--neon-red-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  cursor: pointer;
}

.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 32px 20px;
  text-align: center;
  color: var(--text-dim);
  margin-top: 20px;
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.upload-zone.drag-over,
.upload-zone:active {
  border-color: var(--neon-blue);
  background: rgba(0, 229, 255, 0.06);
}

.upload-zone input[type="file"] { display: none; }

.ttl-note {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--neon-red-soft);
  background: rgba(255, 16, 83, 0.08);
  border: 1px solid rgba(255, 16, 83, 0.3);
  padding: 8px 14px;
  border-radius: 999px;
  margin-top: 16px;
}

/* ---------- Play / Scratch view ---------- */

.play-header { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }

.scratch-grid.hidden { display: none; }

.scratch-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(150px, 100%), 1fr));
  gap: 18px;
  margin-top: 28px;
}

.scratch-card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 4 / 3;
  border: 1px solid var(--border);
  background: #0a0c16;
  box-shadow: 0 0 0 rgba(0,0,0,0);
}

.scratch-card img.reveal-photo {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.scratch-card canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  touch-action: none;
  cursor: pointer;
}

.scratch-card.revealed canvas { opacity: 0; pointer-events: none; transition: opacity 0.6s ease; }
.scratch-card.revealed { box-shadow: 0 0 26px rgba(0, 229, 255, 0.45); }

.scratch-card .revealed-badge {
  position: absolute;
  bottom: 10px;
  right: 10px;
  background: rgba(5, 6, 13, 0.75);
  border: 1px solid var(--neon-blue);
  color: var(--neon-blue-soft);
  font-size: 12px;
  padding: 6px 12px;
  border-radius: 999px;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 0.4s ease, transform 0.4s ease;
  pointer-events: none;
}

.scratch-card.revealed .revealed-badge { opacity: 1; transform: translateY(0); }

.hint-banner {
  margin-top: 20px;
  color: var(--text-dim);
  font-size: 14px;
  text-align: center;
}

.progress-pill {
  font-size: 13px;
  color: var(--neon-blue-soft);
  background: rgba(0, 229, 255, 0.08);
  border: 1px solid rgba(0, 229, 255, 0.35);
  padding: 8px 16px;
  border-radius: 999px;
}

/* ---------- Modal ---------- */

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(2, 3, 8, 0.7);
  backdrop-filter: blur(4px);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 50;
}

.modal-backdrop.open { display: flex; }

.modal {
  width: min(420px, 100%);
  background: var(--bg-panel-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: 0 0 40px rgba(0, 229, 255, 0.15);
}

.modal .actions { display: flex; gap: 10px; margin-top: 20px; justify-content: flex-end; }

/* ---------- Categories ---------- */

:root {
  --cat-0: #00e5ff;
  --cat-1: #ff1053;
  --cat-2: #b26bff;
  --cat-3: #39ff8f;
  --cat-4: #ffe066;
  --cat-5: #ff6bd6;
}

.category-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.cat-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  border: 1px solid var(--chip-color, var(--neon-blue));
  color: var(--chip-color, var(--neon-blue));
  background: color-mix(in srgb, var(--chip-color, var(--neon-blue)) 12%, transparent);
  cursor: pointer;
  user-select: none;
  min-height: 40px;
}

.cat-chip .dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--chip-color, var(--neon-blue));
  flex-shrink: 0;
}

.cat-chip.removable { padding-right: 10px; }
.cat-chip .remove-x {
  margin-left: 2px;
  opacity: 0.7;
  font-size: 15px;
  line-height: 1;
}
.cat-chip .remove-x:hover { opacity: 1; }

.cat-chip.selectable { opacity: 0.4; transition: opacity 0.15s ease, transform 0.1s ease; }
.cat-chip.selectable.active { opacity: 1; }
.cat-chip.selectable:active { transform: scale(0.96); }

.cat-badge {
  position: absolute;
  top: 10px;
  left: 10px;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  color: #05060d;
  background: var(--chip-color, var(--neon-blue));
  box-shadow: 0 0 12px color-mix(in srgb, var(--chip-color, var(--neon-blue)) 60%, transparent);
  pointer-events: none;
}

.cat-0 { --chip-color: var(--cat-0); }
.cat-1 { --chip-color: var(--cat-1); }
.cat-2 { --chip-color: var(--cat-2); }
.cat-3 { --chip-color: var(--cat-3); }
.cat-4 { --chip-color: var(--cat-4); }
.cat-5 { --chip-color: var(--cat-5); }

.category-form {
  display: flex;
  gap: 10px;
  margin-top: 18px;
  flex-wrap: wrap;
}

.category-form input[type="text"] {
  flex: 1;
  min-width: 180px;
  background: rgba(6, 8, 16, 0.8);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 16px;
  color: var(--text);
  font-size: 15px;
  min-height: 44px;
}

.category-select {
  background: rgba(6, 8, 16, 0.85);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  padding: 8px 12px;
  font-size: 13px;
  min-height: 36px;
}

.photo-tile .cat-select-wrap {
  position: absolute;
  bottom: 8px;
  left: 8px;
  right: 8px;
}

.photo-tile .cat-select-wrap select { width: 100%; }

/* ---------- Play setup screen ---------- */

.setup-panel { margin-top: 24px; text-align: center; }
.setup-panel h3 { font-size: 18px; margin-bottom: 4px; }
.setup-panel p { color: var(--text-dim); margin: 0 0 18px; }
.setup-panel .category-bar { justify-content: center; }
.setup-panel .actions { margin-top: 26px; display: flex; justify-content: center; gap: 12px; }

@media (max-width: 640px) {
  body { padding: 16px; }
  .topbar { flex-direction: column; align-items: flex-start; }
}