/* ───────────────────────────────────────────────────────────
   ONBOARDING · v3 design 第二节 · 3 幕电影预告片
   Overrides legacy .onboarding-* with serif headlines + animated visuals.
   Loads AFTER style.css so it wins on .onboarding-overlay.onboarding-v3 scope.
─────────────────────────────────────────────────────────── */
.onboarding-overlay.onboarding-v3 {
  background: rgba(7, 9, 15, 0.78);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  padding: 24px;
}
html.light .onboarding-overlay.onboarding-v3 {
  background: rgba(255, 255, 255, 0.65);
}

.onboarding-v3 .onboarding-card {
  width: 680px;
  max-width: 100%;
  padding: 44px 48px 24px;
  border-radius: 18px;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.01));
  border: 1px solid rgba(var(--accent-rgb), 0.18);
  position: relative;
  overflow: hidden;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.55), 0 0 0 1px rgba(255, 255, 255, 0.03) inset;
}
html.light .onboarding-v3 .onboarding-card {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.92), rgba(255, 255, 255, 0.78));
  border-color: rgba(var(--accent-rgb), 0.25);
  box-shadow: 0 20px 60px rgba(15, 23, 42, 0.18);
}

/* Ambient orb behind the card content */
.onboarding-v3 .onb-orb {
  position: absolute;
  top: -120px;
  left: -60px;
  width: 480px;
  height: 480px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(var(--accent-rgb), 0.22), transparent 60%);
  filter: blur(60px);
  pointer-events: none;
  z-index: 0;
  animation: onb-orb-drift 12s ease-in-out infinite;
}
@keyframes onb-orb-drift {
  0%,100% { transform: translate(0,0) scale(1); }
  50%     { transform: translate(40px,-30px) scale(1.05); }
}
@media (prefers-reduced-motion: reduce) {
  .onboarding-v3 .onb-orb { animation: none; }
}

/* Skip button */
.onboarding-v3 .onboarding-skip {
  position: absolute;
  top: 16px;
  right: 18px;
  z-index: 5;
  font-family: "JetBrains Mono", "SF Mono", Consolas, monospace;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 5px 11px;
  cursor: pointer;
  transition: color var(--dur-fast, 150ms), border-color var(--dur-fast, 150ms);
}
.onboarding-v3 .onboarding-skip:hover {
  color: var(--text-primary);
  border-color: var(--line-strong);
  background: transparent;
}

/* Stage wrapper */
.onboarding-v3 .onb-stage {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 4px 0 8px;
}

.onboarding-v3 .onb-eyebrow {
  font-family: "JetBrains Mono", "SF Mono", Consolas, monospace;
  font-size: 11px;
  color: var(--accent);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 14px;
  display: inline-flex;
  align-items: center;
  gap: 12px;
}
.onboarding-v3 .onb-eyebrow::before {
  content: "";
  display: inline-block;
  width: 18px;
  height: 1px;
  background: var(--accent);
}

.onboarding-v3 .onb-h {
  font-family: "Instrument Serif", "Iowan Old Style", "Songti SC", Georgia, serif;
  font-weight: 400;
  font-size: clamp(34px, 4vw + 10px, 48px);
  line-height: 1.08;
  letter-spacing: -0.018em;
  color: var(--text-primary);
  margin: 0 auto 14px;
  max-width: 620px;
}
.onboarding-v3 .onb-h em {
  font-style: italic;
  color: var(--accent);
}
.onboarding-v3 .onb-sub {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0 auto 24px;
  max-width: 480px;
}

/* Visual area */
.onboarding-v3 .onb-visual {
  margin: 8px auto 18px;
  position: relative;
  display: flex;
  justify-content: center;
  min-height: 150px;
}

/* ── Step 1 visual: pulsing drag target + tilted paper preview ── */
.onboarding-v3 .ob-drag-target {
  width: 260px;
  height: 130px;
  border: 2px dashed rgba(var(--accent-rgb), 0.4);
  border-radius: 14px;
  display: grid;
  place-items: center;
  position: relative;
  background: rgba(var(--accent-rgb), 0.04);
  animation: ob-magnet 2.4s cubic-bezier(.32, .72, 0, 1) infinite;
}
@keyframes ob-magnet {
  0%, 100% { transform: translateY(0); box-shadow: 0 0 0 rgba(var(--accent-rgb), 0); }
  50%      { transform: translateY(-3px); box-shadow: 0 12px 28px rgba(var(--accent-rgb), 0.18); }
}
@media (prefers-reduced-motion: reduce) {
  .onboarding-v3 .ob-drag-target { animation: none; }
}
.onboarding-v3 .ob-drag-center { text-align: center; }
.onboarding-v3 .ob-drag-icon {
  font-family: "Instrument Serif", "Iowan Old Style", "Songti SC", Georgia, serif;
  font-size: 38px;
  color: var(--accent);
  line-height: 1;
}
.onboarding-v3 .ob-drag-l {
  font-family: "JetBrains Mono", "SF Mono", Consolas, monospace;
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 6px;
}
.onboarding-v3 .ob-drop-paper {
  position: absolute;
  width: 72px;
  height: 96px;
  background: #fff;
  border-radius: 6px;
  top: -24px;
  right: -24px;
  transform: rotate(8deg);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.4);
  background-image: linear-gradient(180deg, #2563eb 0%, #2563eb 18%, #fff 18%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 6px 7px;
  font-family: "Inter", "PingFang SC", sans-serif;
  font-size: 6px;
  color: #555;
  line-height: 1.4;
  animation: ob-paper-drift 3s ease-in-out infinite;
}
@keyframes ob-paper-drift {
  0%, 100% { transform: rotate(8deg)  translate(0, 0); }
  50%      { transform: rotate(3deg)  translate(-6px, -3px); }
}
@media (prefers-reduced-motion: reduce) {
  .onboarding-v3 .ob-drop-paper { animation: none; }
}

/* ── Step 2 visual: stagger-fade extract preview ── */
.onboarding-v3 .ob-extract {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  overflow: hidden;
  min-width: 340px;
  max-width: 480px;
}
.onboarding-v3 .ob-extract-row {
  background: var(--bg-surface);
  padding: 8px 16px;
  font-size: 12.5px;
  display: contents;
}
.onboarding-v3 .ob-extract-row > div {
  background: var(--bg-surface);
  padding: 8px 16px;
}
.onboarding-v3 .ob-extract-row.head > div {
  background: var(--bg-elevated);
  font-family: "JetBrains Mono", "SF Mono", Consolas, monospace;
  font-size: 10px;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 7px 16px;
}
.onboarding-v3 .ob-extract-l { color: var(--text-secondary); text-align: left; }
.onboarding-v3 .ob-extract-v {
  font-family: "JetBrains Mono", "SF Mono", Consolas, monospace;
  text-align: right;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}
.onboarding-v3 .ob-extract-v.ob-extract-gain { color: var(--gain); }

/* Stagger-fade — only when step 2 is the active step */
#onb-step-2 .ob-extract-row > div {
  animation: ob-fade-in 0.5s cubic-bezier(.22, .61, .36, 1) backwards;
}
#onb-step-2 .ob-extract-row:nth-child(1) > div { animation-delay: 0.05s; }
#onb-step-2 .ob-extract-row:nth-child(2) > div { animation-delay: 0.15s; }
#onb-step-2 .ob-extract-row:nth-child(3) > div { animation-delay: 0.25s; }
#onb-step-2 .ob-extract-row:nth-child(4) > div { animation-delay: 0.35s; }
#onb-step-2 .ob-extract-row:nth-child(5) > div { animation-delay: 0.45s; }
#onb-step-2 .ob-extract-row:nth-child(6) > div { animation-delay: 0.55s; }
#onb-step-2 .ob-extract-row:nth-child(7) > div { animation-delay: 0.65s; }
@keyframes ob-fade-in {
  from { opacity: 0; transform: translateX(-6px); }
  to   { opacity: 1; transform: translateX(0); }
}
@media (prefers-reduced-motion: reduce) {
  #onb-step-2 .ob-extract-row > div { animation: none !important; }
}

/* ── Step 3 visual: AI memo typing ── */
.onboarding-v3 .ob-memo {
  width: 520px;
  max-width: 100%;
  background: var(--bg-surface);
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  padding: 20px 22px;
  text-align: left;
}
.onboarding-v3 .ob-memo-h {
  font-family: "JetBrains Mono", "SF Mono", Consolas, monospace;
  font-size: 10px;
  color: var(--accent);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.onboarding-v3 .ob-memo-h::before {
  content: "⚡";
  font-family: "Inter", sans-serif;
}
.onboarding-v3 .ob-memo-body {
  font-family: "Instrument Serif", "Iowan Old Style", "Songti SC", Georgia, serif;
  font-style: italic;
  font-size: 17px;
  line-height: 1.55;
  color: var(--text-primary);
  min-height: 84px;
}
.onboarding-v3 .ob-memo-char {
  opacity: 0;
  animation: ob-char-in 0.12s cubic-bezier(.22, .61, .36, 1) forwards;
  animation-delay: calc(var(--i) * 22ms + 200ms);
}
@keyframes ob-char-in { to { opacity: 1; } }
.onboarding-v3 .ob-memo-cursor {
  display: inline-block;
  width: 2px;
  height: 1em;
  background: var(--accent);
  vertical-align: -3px;
  margin-left: 1px;
  animation: ob-cursor-blink 1s step-end infinite;
}
@keyframes ob-cursor-blink {
  50% { opacity: 0; }
}
@media (prefers-reduced-motion: reduce) {
  .onboarding-v3 .ob-memo-char  { opacity: 1; animation: none; }
  .onboarding-v3 .ob-memo-cursor { animation: none; }
}

/* Controls (dots + back/next) */
.onboarding-v3 .onb-controls-v3 {
  border-top: 1px solid var(--line);
  padding-top: 14px;
  margin-top: 12px;
  position: relative;
  z-index: 1;
}
.onboarding-v3 .onboarding-dots .onboarding-dot {
  width: 6px;
  height: 6px;
  background: var(--line-strong);
  border-radius: 999px;
  cursor: pointer;
  transition: width var(--dur-normal, 240ms), background var(--dur-normal, 240ms);
}
.onboarding-v3 .onboarding-dots .onboarding-dot.active {
  background: var(--accent);
  width: 22px;
  border-radius: 3px;
  box-shadow: 0 0 12px rgba(var(--accent-rgb), 0.5);
  transform: none;
}
.onboarding-v3 .onb-btn-back {
  padding: 8px 14px;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--text-muted);
  border-radius: 8px;
  font-family: inherit;
  font-size: 12px;
  cursor: pointer;
  transition: color var(--dur-fast, 150ms), border-color var(--dur-fast, 150ms);
}
.onboarding-v3 .onb-btn-back:hover {
  color: var(--text-primary);
  border-color: var(--line-strong);
}
.onboarding-v3 .onb-btn-next {
  padding: 9px 22px;
  background: linear-gradient(180deg, var(--accent), var(--accent-dark, var(--accent)));
  color: var(--on-accent);
  border: 0;
  border-radius: 9px;
  font-family: inherit;
  font-weight: 600;
  font-size: 13px;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(var(--accent-rgb), 0.28);
  transition: filter var(--dur-fast, 150ms), transform var(--dur-fast, 150ms);
}
.onboarding-v3 .onb-btn-next:hover {
  filter: brightness(1.08);
  transform: translateY(-1px);
}

@media (max-width: 640px) {
  .onboarding-v3 .onboarding-card { padding: 32px 24px 18px; }
  .onboarding-v3 .onb-h { font-size: 28px; }
  .onboarding-v3 .ob-extract { min-width: 0; width: 100%; }
  .onboarding-v3 .ob-memo { padding: 16px; font-size: 15px; }
}