/* Apple Intelligence 风格入场对话 */
.onboard-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: rgba(253, 248, 243, 0.72);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}
.onboard-overlay.hidden { display: none; }

.onboard-card {
  width: min(520px, 100%);
  border-radius: 28px;
  padding: 36px 32px 32px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 24px 80px rgba(46, 58, 44, 0.12);
  position: relative;
  overflow: hidden;
}

.onboard-card::before {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: 30px;
  padding: 2px;
  background: linear-gradient(135deg, #9BBF8F, #C5B4D9, #F4C3A2, #A3C4D9, #9BBF8F);
  background-size: 300% 300%;
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  animation: aiBorder 6s ease infinite;
  pointer-events: none;
  opacity: 0.7;
}

@keyframes aiBorder {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.onboard-step { display: none; }
.onboard-step.active { display: block; animation: fadeUp 0.4s ease; }

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

.onboard-tagline-en {
  font-size: clamp(14px, 3.2vw, 16px);
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--morning-mist);
  text-align: center;
  margin-bottom: 8px;
  line-height: 1.5;
}
.onboard-tagline-cn {
  font-size: clamp(22px, 5.5vw, 30px);
  font-weight: 300;
  letter-spacing: 0.06em;
  color: var(--text-olive);
  text-align: center;
  margin-bottom: 20px;
  line-height: 1.4;
}
.onboard-q-cn {
  font-size: clamp(26px, 6vw, 34px);
  font-weight: 400;
  letter-spacing: 0.04em;
  margin-bottom: 6px;
  line-height: 1.35;
  color: var(--text-olive);
}
.onboard-q-en {
  font-size: clamp(13px, 3vw, 15px);
  font-weight: 300;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 20px;
  text-transform: lowercase;
}
.onboard-brand {
  text-align: center;
  margin-bottom: 28px;
}
.onboard-brand .logo-big {
  font-size: clamp(36px, 8vw, 48px);
  font-weight: 200;
  letter-spacing: 0.14em;
  margin-bottom: 8px;
}
.onboard-brand .logo-big span { color: var(--morning-mist); }
.onboard-brand .tagline-en {
  font-size: 13px;
  color: var(--text-muted);
  letter-spacing: 0.12em;
  margin-bottom: 4px;
}
.onboard-brand .tagline-cn {
  font-size: 15px;
  color: var(--text-muted);
}
.onboard-start-btn {
  width: 100%;
  padding: 18px 24px;
  border-radius: 20px;
  font-size: 17px;
  margin-top: 8px;
}
.onboard-start-btn .en {
  display: block;
  font-size: 12px;
  font-weight: 300;
  letter-spacing: 0.1em;
  opacity: 0.85;
  margin-top: 4px;
}

.onboard-opt.positive { background: rgba(244, 195, 162, 0.2); }
.onboard-opt.positive.selected { background: var(--warm-sun); color: var(--text-olive); border-color: var(--warm-sun); }

.onboard-next-arrow {
  display: none;
  width: 100%;
  margin-top: 24px;
  padding: 16px;
  border-radius: 16px;
  font-size: 16px;
  animation: fadeUp 0.5s ease;
}
.onboard-next-arrow.visible { display: flex; align-items: center; justify-content: center; gap: 8px; }

.onboard-q {
  font-size: clamp(22px, 5vw, 28px);
  font-weight: 300;
  letter-spacing: 0.02em;
  margin-bottom: 8px;
  line-height: 1.4;
}
.onboard-sub {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.onboard-options {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 28px;
}
.onboard-opt {
  padding: 12px 18px;
  border-radius: 999px;
  font-size: 14px;
  background: rgba(155, 191, 143, 0.12);
  border: 2px solid transparent;
  transition: all 0.2s;
  cursor: pointer;
}
.onboard-opt:hover { background: rgba(155, 191, 143, 0.22); }
.onboard-opt.selected {
  background: var(--morning-mist);
  color: #fff;
  border-color: var(--morning-mist);
}

.ai-shimmer-wrap {
  min-height: 100px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin: 20px 0 28px;
}
.ai-orb {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: conic-gradient(from 0deg, #9BBF8F, #C5B4D9, #F4C3A2, #A3C4D9, #9BBF8F);
  animation: orbSpin 3s linear infinite;
  position: relative;
}
.ai-orb::after {
  content: '';
  position: absolute;
  inset: 6px;
  border-radius: 50%;
  background: rgba(255,255,255,0.95);
}
@keyframes orbSpin { to { transform: rotate(360deg); } }

.ai-reply {
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-olive);
  text-align: center;
  padding: 0 8px;
}
.ai-reply.typing::after {
  content: '▋';
  animation: blink 0.8s step-end infinite;
  color: var(--morning-mist);
}
@keyframes blink { 50% { opacity: 0; } }

.onboard-choices { display: grid; gap: 12px; }

.onboard-card.wide {
  width: min(920px, 100%);
  max-height: min(88vh, 720px);
  overflow-y: auto;
}

.onboard-choice-btn {
  width: 100%;
  padding: 18px 20px;
  border-radius: 20px;
  text-align: left;
  border: 2px dashed rgba(155, 191, 143, 0.45);
  background: rgba(255,255,255,0.8);
  transition: all 0.2s;
}
.onboard-choice-btn:hover {
  border-color: var(--morning-mist);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(155, 191, 143, 0.2);
}
.onboard-choice-btn strong { display: block; font-size: 16px; margin-bottom: 4px; }
.onboard-choice-btn span { font-size: 13px; color: var(--text-muted); }

.preview-overlay {
  position: fixed;
  inset: 0;
  z-index: 900;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: rgba(46, 58, 44, 0.45);
  backdrop-filter: blur(8px);
}
.preview-overlay.visible { display: flex; }

.preview-card {
  width: min(560px, 100%);
  border-radius: var(--card-radius);
  padding: 28px;
  background: #fff;
  text-align: center;
}
.preview-card img {
  width: 100%;
  max-height: 50vh;
  object-fit: contain;
  border-radius: 16px;
  margin: 16px 0 24px;
  background: #fafafa;
}
.preview-actions { display: flex; gap: 12px; flex-wrap: wrap; justify-content: center; }

.main-content { display: none; }
.main-content.visible { display: block; }

.daily-challenge-block { margin-bottom: 24px; }