/* ============================================================
   AI Setup Screen — Escape The Viva
   ============================================================ */

#ai-setup-screen {
  flex-direction: column;
  background: linear-gradient(160deg, #080300 0%, #1a0800 50%, #0d0500 100%);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  align-items: center;
  justify-content: flex-start;
  padding: 16px 16px 60px;
}

.ai-setup-content {
  width: 100%;
  max-width: 480px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  position: relative;
  z-index: 10;
  padding-top: 8px;
}

/* ── Back Button ── */
.ai-back-btn {
  background: none;
  border: 1px solid rgba(255,255,255,0.12);
  color: #888;
  padding: 6px 14px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 12px;
  font-weight: 700;
  align-self: flex-start;
  transition: all 0.2s;
  letter-spacing: 0.5px;
}
.ai-back-btn:hover { color: #fff; border-color: rgba(255,255,255,0.3); }

/* ── Header ── */
.ai-setup-header { text-align: center; display: flex; flex-direction: column; gap: 4px; }

.ai-setup-title {
  font-size: clamp(20px, 5vw, 28px);
  font-weight: 900;
  color: #fff;
  letter-spacing: -0.5px;
  text-shadow: 0 0 30px rgba(240,180,41,0.35);
}

.ai-setup-sub {
  font-size: 12px;
  color: #666;
  font-style: italic;
}

/* ── Steps ── */
.ai-step {
  background: rgba(0,0,0,0.45);
  border: 1.5px solid rgba(255,140,0,0.18);
  border-radius: 14px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  animation: aiStepIn 0.3s ease-out;
}

@keyframes aiStepIn {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

.ai-step-label {
  font-size: 10px;
  font-weight: 800;
  color: #f0b429;
  text-transform: uppercase;
  letter-spacing: 2px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.ai-step-label::before {
  content: '';
  display: inline-block;
  width: 3px;
  height: 12px;
  background: #f0b429;
  border-radius: 2px;
}

/* ── Upload Area ── */
.ai-upload-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 2px dashed rgba(240,180,41,0.35);
  border-radius: 12px;
  padding: 24px 16px;
  cursor: pointer;
  transition: all 0.25s ease;
  text-align: center;
  position: relative;
  overflow: hidden;
  min-height: 120px;
}

.ai-upload-area:hover,
.ai-upload-area.drag-over {
  border-color: #f0b429;
  background: rgba(240,180,41,0.06);
}

.ai-upload-area.uploading {
  border-color: rgba(255,255,255,0.2);
  cursor: default;
  pointer-events: none;
}

.ai-upload-area.success {
  border-color: rgba(46,204,113,0.5);
  border-style: solid;
  background: rgba(46,204,113,0.05);
}

.ai-upload-area.error {
  border-color: rgba(231,76,60,0.5);
  border-style: solid;
  background: rgba(231,76,60,0.05);
}

.ai-upload-icon-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

#ai-upload-icon {
  font-size: 28px;
  line-height: 1;
  transition: all 0.2s;
}

#ai-upload-label {
  font-size: 14px;
  font-weight: 800;
  color: #f0d090;
  cursor: pointer;
  transition: color 0.2s;
}

.ai-upload-area.success #ai-upload-label { color: #2ecc71; }
.ai-upload-area.error #ai-upload-label { color: #e74c3c; }

#ai-upload-hint {
  font-size: 11px;
  color: #555;
  transition: color 0.2s;
}

/* Format badges */
.ai-format-badges {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: center;
}

.ai-format-badge {
  font-size: 10px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 20px;
  border: 1px solid rgba(255,255,255,0.1);
  color: #666;
  background: rgba(255,255,255,0.03);
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

/* ── Upload Loading ── */
.ai-upload-loading {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: rgba(240,180,41,0.06);
  border: 1px solid rgba(240,180,41,0.2);
  border-radius: 10px;
}

.ai-upload-spinner {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(240,180,41,0.2);
  border-top-color: #f0b429;
  border-radius: 50%;
  animation: aiSpin 0.7s linear infinite;
  flex-shrink: 0;
}

#ai-upload-loading-text {
  font-size: 12px;
  font-weight: 700;
  color: #f0b429;
}

/* ── Topics Grid ── */
.ai-topics-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.ai-topic-btn {
  padding: 8px 14px;
  border-radius: 20px;
  border: 1.5px solid rgba(255,140,0,0.3);
  background: rgba(255,140,0,0.06);
  color: #ffb830;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
  letter-spacing: 0.3px;
}

.ai-topic-btn:hover {
  border-color: #f0b429;
  background: rgba(240,180,41,0.15);
  color: #fff;
  transform: translateY(-1px);
}

.ai-topic-btn.active {
  border-color: #f0b429;
  background: rgba(240,180,41,0.22);
  color: #fff;
  box-shadow: 0 0 14px rgba(240,180,41,0.25);
}

/* ── Difficulty Row ── */
.ai-diff-row {
  display: flex;
  gap: 8px;
}

.ai-diff-btn {
  flex: 1;
  padding: 10px 8px;
  border-radius: 9px;
  border: 1.5px solid rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.04);
  color: #888;
  font-size: 12px;
  font-weight: 800;
  cursor: pointer;
  transition: all 0.2s;
  letter-spacing: 0.3px;
}

.ai-diff-btn:hover { border-color: rgba(255,255,255,0.25); color: #ccc; }

.ai-diff-btn.active {
  border-color: #f0b429;
  background: rgba(240,180,41,0.15);
  color: #f0b429;
  box-shadow: 0 0 10px rgba(240,180,41,0.15);
}

/* ── Generate Button ── */
.ai-generate-btn {
  width: 100%;
  padding: 14px;
  background: linear-gradient(135deg, #b87200, #f0b429);
  color: #000;
  font-size: 15px;
  font-weight: 900;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  transition: all 0.2s;
  box-shadow: 0 6px 20px rgba(240,180,41,0.35);
  position: relative;
  overflow: hidden;
}

.ai-generate-btn::after {
  content: '';
  position: absolute;
  top: -50%; left: -60%;
  width: 50%; height: 200%;
  background: rgba(255,255,255,0.2);
  transform: skewX(-20deg);
  animation: aiShine 2.5s infinite;
}

@keyframes aiShine {
  0%   { left: -60%; }
  100% { left: 130%; }
}

.ai-generate-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(240,180,41,0.55);
}

.ai-generate-btn:active { transform: translateY(0); }

.ai-generate-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

/* ── Generate Loading ── */
.ai-loading {
  display: none;
  align-items: center;
  gap: 12px;
  padding: 16px;
  background: rgba(240,180,41,0.05);
  border: 1px solid rgba(240,180,41,0.2);
  border-radius: 12px;
}

.ai-loading-spinner {
  width: 28px;
  height: 28px;
  border: 3px solid rgba(240,180,41,0.15);
  border-top-color: #f0b429;
  border-radius: 50%;
  animation: aiSpin 0.75s linear infinite;
  flex-shrink: 0;
}

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

#ai-loading-text {
  font-size: 13px;
  font-weight: 700;
  color: #f0b429;
  line-height: 1.4;
}

/* ── Error ── */
.ai-error {
  background: rgba(231,76,60,0.1);
  border: 1.5px solid rgba(231,76,60,0.35);
  border-radius: 10px;
  padding: 11px 14px;
  color: #e74c3c;
  font-size: 12px;
  font-weight: 700;
  line-height: 1.5;
  animation: aiStepIn 0.2s ease-out;
}

/* ── AI Button on Start Screen ── */
.ai-viva-btn {
  width: 100%;
  padding: 11px;
  background: rgba(240,180,41,0.07);
  border: 1.5px solid rgba(240,180,41,0.3);
  border-radius: 10px;
  color: #f0b429;
  font-size: 13px;
  font-weight: 800;
  cursor: pointer;
  letter-spacing: 0.8px;
  transition: all 0.2s;
  margin-top: 2px;
}

.ai-viva-btn:hover {
  background: rgba(240,180,41,0.14);
  border-color: #f0b429;
  box-shadow: 0 0 16px rgba(240,180,41,0.2);
}