/* LiveDash studio — Vmake-like open layout (no card chrome) */
:root {
  --st-paper: #f6f7f9;
  --st-white: #ffffff;
  --st-ink: #0c1222;
  --st-mute: #5b6577;
  --st-line: #e6e9ef;
  --st-signal: #00a3c4;
  --st-deep: #0b6e8a;
  --st-tally: #ff5c39;
  --st-soft: #e8f7fb;
  --st-mist: #eef1f5;
  --font-display: "Sora", "Noto Sans SC", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "Sora", system-ui, sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --r-pill: 999px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
/* Lock paper canvas — ignore site dark theme */
html body.st-body,
html[data-theme="dark"] body.st-body,
html[data-theme="light"] body.st-body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--st-ink);
  background: var(--st-paper);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  color-scheme: light;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font: inherit; }

.st-skip {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--st-ink); color: #fff; padding: 8px 12px;
}
.st-skip:focus { left: 16px; top: 16px; }

.st-wrap {
  width: min(1120px, calc(100% - 48px));
  margin-inline: auto;
}

/* —— Nav —— */
.st-nav {
  position: sticky; top: 0; z-index: 40;
  backdrop-filter: blur(14px);
  background: rgba(246, 247, 249, 0.88);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease);
}
.st-nav.is-scrolled { border-bottom-color: var(--st-line); }
.st-nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; min-height: 64px;
}
.st-brand {
  display: inline-flex; align-items: center; gap: 10px; font-weight: 700;
}
.st-brand-mark {
  width: 28px; height: 22px; flex-shrink: 0;
  background: url("./logo.svg") center / contain no-repeat;
}
.st-brand em { font-style: normal; color: var(--st-mute); font-weight: 600; margin-left: 4px; }
.st-nav-links {
  display: flex; align-items: center; gap: 26px;
  font-size: 14px; font-weight: 500; color: var(--st-mute);
}
.st-nav-links > a:hover,
.st-nav-dd-btn:hover { color: var(--st-ink); }
.st-nav-dd {
  position: relative;
}
.st-nav-dd-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
  font: inherit;
  font-weight: 500;
  cursor: pointer;
}
.st-nav-dd-btn::after {
  content: "";
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid currentColor;
  opacity: 0.55;
  transition: transform 0.2s var(--ease);
}
.st-nav-dd.is-open .st-nav-dd-btn::after,
.st-nav-dd:hover .st-nav-dd-btn::after {
  transform: rotate(180deg);
}
.st-nav-dd-panel {
  display: none;
  position: absolute;
  top: calc(100% + 10px);
  left: 50%;
  transform: translateX(-50%);
  min-width: 200px;
  padding: 8px;
  border: 1px solid var(--st-line);
  border-radius: 12px;
  background: var(--st-paper);
  box-shadow: 0 12px 32px rgba(12, 18, 34, 0.1);
  z-index: 40;
}
.st-nav-dd.is-open .st-nav-dd-panel,
.st-nav-dd:hover .st-nav-dd-panel,
.st-nav-dd:focus-within .st-nav-dd-panel {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.st-nav-dd-panel a {
  display: block;
  padding: 10px 12px;
  border-radius: 8px;
  color: var(--st-ink);
  font-size: 13px;
  font-weight: 500;
  white-space: nowrap;
  text-decoration: none;
}
.st-nav-dd-panel a:hover {
  background: var(--st-soft);
  color: var(--st-ink);
}
.st-nav-actions { display: flex; align-items: center; gap: 10px; }
.st-nav-lang { display: inline-flex; align-items: center; }
.st-nav-lang .lang-switch {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--st-line);
  border-radius: 999px;
  overflow: hidden;
  background: transparent;
}
.st-nav-lang .lang-switch-btn {
  border: 0;
  background: transparent;
  color: var(--st-mute);
  font: inherit;
  font-size: 12px;
  font-weight: 600;
  padding: 5px 10px;
  cursor: pointer;
  line-height: 1.2;
}
.st-nav-lang .lang-switch-btn.is-active {
  background: var(--st-soft);
  color: var(--st-ink);
}
.st-nav-lang .lang-switch-btn:hover { color: var(--st-ink); }
.st-nav-toggle {
  display: none; width: 40px; height: 40px; border: 0; border-radius: 8px;
  background: transparent; cursor: pointer;
}
.st-nav-toggle span {
  display: block; width: 16px; height: 2px; margin: 4px auto; background: var(--st-ink);
}

/* —— Buttons —— */
.st-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 22px; border-radius: var(--r-pill);
  font-family: var(--font-display); font-size: 15px; font-weight: 600;
  border: 1px solid transparent; cursor: pointer;
  transition: transform 0.25s var(--ease), background 0.25s var(--ease), opacity 0.25s var(--ease);
}
.st-btn:hover { transform: translateY(-1px); }
.st-btn:active { transform: scale(0.98); }
.st-btn:focus-visible { outline: 2px solid var(--st-signal); outline-offset: 3px; }
.st-btn-primary { background: var(--st-ink); color: #fff; }
.st-btn-primary:hover { background: #1a2438; }
.st-btn-accent { background: var(--st-tally); color: #fff; }
.st-btn-accent:hover { opacity: 0.92; }
.st-btn-ghost {
  background: transparent; color: var(--st-ink); border-color: transparent;
}
.st-btn-ghost:hover { background: rgba(12, 18, 34, 0.04); }
.st-btn-sm { padding: 8px 14px; font-size: 14px; }

/* —— Hero —— */
.st-hero {
  position: relative;
  padding: 48px 0 72px;
  overflow: hidden;
}
.st-hero::before {
  content: "";
  position: absolute; inset: -18% -8% auto;
  height: 68%;
  background:
    radial-gradient(ellipse 48% 58% at 72% 18%, rgba(0, 163, 196, 0.14), transparent 70%),
    radial-gradient(ellipse 36% 46% at 12% 42%, rgba(255, 92, 57, 0.06), transparent 65%);
  pointer-events: none;
  transition: opacity 0.6s var(--ease);
}
.st-hero[data-hero-slide="1"]::before {
  background:
    radial-gradient(ellipse 48% 58% at 72% 18%, rgba(11, 110, 138, 0.18), transparent 70%),
    radial-gradient(ellipse 36% 46% at 12% 42%, rgba(0, 163, 196, 0.1), transparent 65%);
}
.st-hero-tabs {
  position: relative;
  display: inline-flex;
  gap: 4px;
  margin: 0 0 28px;
  padding: 4px;
  border: 1px solid var(--st-line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
}
.st-hero-tab {
  border: 0;
  background: transparent;
  color: var(--st-mute);
  font: inherit;
  font-size: 13px;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: 999px;
  cursor: pointer;
  line-height: 1.2;
  transition: background 0.25s var(--ease), color 0.25s var(--ease);
}
.st-hero-tab:hover { color: var(--st-ink); }
.st-hero-tab.is-active {
  background: var(--st-soft);
  color: var(--st-ink);
}
.st-hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}
.st-hero-copy.is-swap {
  animation: stHeroSwap 0.55s var(--ease);
}
.st-stage.is-swap {
  animation: stHeroSwap 0.55s var(--ease);
}
@keyframes stHeroSwap {
  0% { opacity: 0.35; transform: translateY(10px); }
  100% { opacity: 1; transform: none; }
}
.st-hero-dots {
  position: relative;
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: 28px;
}
.st-hero-dot {
  width: 28px;
  height: 4px;
  border: 0;
  padding: 0;
  border-radius: 99px;
  background: rgba(12, 18, 34, 0.12);
  cursor: pointer;
  transition: background 0.25s var(--ease), width 0.25s var(--ease);
}
.st-hero-dot.is-active {
  width: 40px;
  background: var(--st-signal);
}
.st-hero-dot:hover { background: rgba(0, 163, 196, 0.45); }
.st-eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  margin: 0 0 16px;
  font-size: 13px; font-weight: 600; color: var(--st-deep);
  letter-spacing: 0.02em;
}
.st-eyebrow i {
  width: 7px; height: 7px; border-radius: 50%; background: var(--st-tally);
  box-shadow: 0 0 0 3px rgba(255, 92, 57, 0.16);
  animation: stPulse 1.6s var(--ease) infinite;
}
@keyframes stPulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.12); opacity: 0.75; }
}
.st-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(36px, 5vw, 54px);
  line-height: 1.12;
  letter-spacing: -0.03em;
  font-weight: 700;
  text-wrap: balance;
}
.st-hero h1 span {
  background: linear-gradient(100deg, var(--st-deep), var(--st-signal));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.st-hero-lead {
  margin: 18px 0 0;
  max-width: 34em;
  color: var(--st-mute);
  font-size: 17px;
  text-wrap: pretty;
}
.st-hero-actions {
  display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px;
}
.st-trust {
  display: flex; flex-wrap: wrap; gap: 16px; align-items: center;
  margin-top: 22px; font-size: 13px; color: var(--st-mute);
}
.st-trust strong { color: var(--st-ink); font-weight: 700; }
.st-stars { color: #f5a524; letter-spacing: 1px; }

/* Product stage — only interactive surface kept as a soft panel */
.st-stage {
  position: relative;
  background: linear-gradient(165deg, #fbfdff 0%, #eef6f9 100%);
  border-radius: 16px;
  overflow: hidden;
}
.st-stage-bar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 18px 6px;
}
.st-stage-dots { display: flex; gap: 6px; }
.st-stage-dots i {
  width: 8px; height: 8px; border-radius: 50%; background: #cfd6e2;
}
.st-stage-dots i:nth-child(1) { background: #ff6b6b; }
.st-stage-dots i:nth-child(2) { background: #ffd166; }
.st-stage-dots i:nth-child(3) { background: #06d6a0; }
.st-live-pill {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12px; font-weight: 700; color: var(--st-tally);
}
.st-stage-body { padding: 8px 18px 18px; display: grid; gap: 14px; }
.st-decision {
  padding: 4px 0 10px;
  border-bottom: 1px solid rgba(12, 18, 34, 0.06);
}
.st-decision .label {
  margin: 0 0 6px; font-size: 12px; font-weight: 700;
  color: var(--st-deep); letter-spacing: 0.04em; text-transform: uppercase;
}
.st-decision p { margin: 0; font-size: 14px; color: var(--st-ink); }
.st-decision p + p { margin-top: 6px; color: var(--st-mute); }
.st-feed { position: relative; min-height: 108px; }
.st-feed-card {
  position: absolute; inset: 0;
  display: grid; gap: 10px;
  opacity: 0; transform: translateY(10px);
  transition: opacity 0.35s var(--ease), transform 0.35s var(--ease);
}
.st-feed-card.is-in { opacity: 1; transform: none; }
.st-feed-card.is-out { opacity: 0; transform: translateY(-8px); }
.st-row {
  display: grid; grid-template-columns: auto 1fr auto; gap: 10px; align-items: start;
  padding: 8px 0;
  border-bottom: 1px solid rgba(12, 18, 34, 0.05);
  font-size: 13px;
}
.st-row:last-child { border-bottom: 0; }
.st-row .k { font-weight: 700; color: var(--st-signal); }
.st-row .k.reply { color: var(--st-deep); }
.st-row .st { color: var(--st-mute); white-space: nowrap; }
.st-progress {
  height: 3px; border-radius: 99px; background: rgba(12, 18, 34, 0.08); overflow: hidden;
}
.st-progress > i {
  display: block; height: 100%; width: 0;
  background: linear-gradient(90deg, var(--st-signal), var(--st-deep));
}

/* —— Sections —— */
.st-section { padding: 96px 0; }
.st-section-head {
  max-width: 640px; margin: 0 auto 48px; text-align: center;
}
.st-section-head .kicker {
  margin: 0 0 10px; font-size: 13px; font-weight: 700;
  letter-spacing: 0.08em; text-transform: uppercase; color: var(--st-signal);
}
.st-section-head h2 {
  margin: 0; font-family: var(--font-display);
  font-size: clamp(28px, 3.4vw, 40px); line-height: 1.2;
  letter-spacing: -0.02em; text-wrap: balance;
}
.st-section-head p {
  margin: 14px 0 0; color: var(--st-mute); font-size: 17px;
}

/* Soft band — tone shift only, no boxed chrome */
.st-band {
  background: var(--st-white);
}

/* Steps — numbered circles + checklist */
.st-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px 48px;
  margin-top: 8px;
}
.st-step {
  position: relative;
  padding: 0;
  background: none;
  border: 0;
  box-shadow: none;
  text-align: center;
}
.st-step-n {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  margin: 0 auto 20px;
  border-radius: 50%;
  border: 2px solid var(--st-tally);
  color: var(--st-tally);
  background: var(--st-white);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0;
  position: relative;
  z-index: 1;
}
.st-step:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 23px;
  left: calc(50% + 32px);
  width: calc(100% - 16px);
  height: 2px;
  background: linear-gradient(90deg, var(--st-tally), rgba(255, 92, 57, 0.35));
  pointer-events: none;
}
.st-step:not(:last-child)::before {
  content: "";
  position: absolute;
  top: 19px;
  right: -10px;
  width: 10px;
  height: 10px;
  border-top: 2px solid var(--st-tally);
  border-right: 2px solid var(--st-tally);
  transform: rotate(45deg);
  z-index: 1;
  pointer-events: none;
}
.st-step h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.01em;
  text-wrap: balance;
}
.st-step > p {
  margin: 12px 0 0;
  color: var(--st-mute);
  font-size: 14px;
  line-height: 1.6;
  text-wrap: pretty;
}
.st-step ul {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
  text-align: left;
  max-width: 260px;
  margin-inline: auto;
}
.st-step li {
  position: relative;
  padding-left: 22px;
  color: var(--st-ink);
  font-size: 14px;
  line-height: 1.45;
}
.st-step li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(255, 92, 57, 0.12);
  box-shadow: inset 0 0 0 2px var(--st-tally);
}
.st-step li::after {
  content: "";
  position: absolute;
  left: 3px;
  top: 8px;
  width: 6px;
  height: 3px;
  border-left: 1.5px solid var(--st-tally);
  border-bottom: 1.5px solid var(--st-tally);
  transform: rotate(-45deg);
}

/* Workflows — open columns + tone accent line */
.st-workflows {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px 48px;
}
.st-work {
  position: relative;
  padding: 8px 0 0;
  background: none;
  border: 0;
  min-height: 0;
}
.st-work::before {
  content: "";
  display: block;
  width: 40px; height: 3px; margin-bottom: 18px; border-radius: 99px;
  background: var(--st-signal);
}
.st-work[data-tone="drop"]::before { background: var(--st-tally); }
.st-work[data-tone="flow"]::before { background: #0284c7; }
.st-work h3 {
  margin: 0; font-family: var(--font-display); font-size: 22px; font-weight: 700;
}
.st-work p { margin: 12px 0 0; color: var(--st-mute); max-width: 28em; }
.st-work .cta {
  display: inline-flex; margin-top: 18px; font-size: 14px; font-weight: 700;
  color: var(--st-deep);
}
.st-work .cta:hover { text-decoration: underline; text-underline-offset: 3px; }

/* —— Shared split-section type (brain / realtime / langs) —— */
.st-split-kicker {
  margin: 0 0 12px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--st-signal);
}
.st-split-copy h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(28px, 3.4vw, 40px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--st-ink);
  text-wrap: balance;
}
.st-split-copy h2 em {
  font-style: normal;
  background: linear-gradient(100deg, var(--st-deep), var(--st-signal));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.st-split-lead {
  margin: 16px 0 0;
  max-width: 36em;
  color: var(--st-mute);
  font-size: 16px;
  line-height: 1.75;
  text-wrap: pretty;
}
.st-feature-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
}
.st-feature-pills span {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  border-radius: 10px;
  border: 1px solid var(--st-line);
  background: var(--st-white);
  font-size: 13px;
  font-weight: 600;
  color: var(--st-ink);
}

/* —— Realtime interaction band —— */
.st-realtime {
  position: relative;
  padding: 96px 0;
  color: var(--st-ink);
  background: var(--st-white);
  overflow: hidden;
}
.st-realtime-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 48px;
  align-items: center;
}
.st-realtime-orbit {
  position: relative;
  width: min(100%, 420px);
  aspect-ratio: 1;
  margin-inline: auto;
  container-type: inline-size;
  border-radius: 16px;
  background: linear-gradient(165deg, #fbfdff 0%, #eef6f9 100%);
}
.st-orbit-layer {
  position: absolute;
  inset: 0;
  will-change: transform;
}
.st-orbit-layer-outer {
  --orbit-r: 46cqw;
  --orbit-dur: 32s;
  --orbit-dir: 1;
  animation: stOrbitSpin var(--orbit-dur) linear infinite;
}
.st-orbit-layer-mid {
  --orbit-r: 34cqw;
  --orbit-dur: 24s;
  --orbit-dir: -1;
  animation: stOrbitSpinRev var(--orbit-dur) linear infinite;
}
.st-orbit-layer-inner {
  --orbit-r: 22cqw;
  --orbit-dur: 18s;
  --orbit-dir: 1;
  animation: stOrbitSpin var(--orbit-dur) linear infinite;
}
@supports not (width: 1cqw) {
  .st-orbit-layer-outer { --orbit-r: 193px; }
  .st-orbit-layer-mid { --orbit-r: 143px; }
  .st-orbit-layer-inner { --orbit-r: 92px; }
}
.st-orbit-ring {
  position: absolute;
  left: 50%; top: 50%;
  width: calc(var(--orbit-r) * 2);
  height: calc(var(--orbit-r) * 2);
  margin: calc(var(--orbit-r) * -1) 0 0 calc(var(--orbit-r) * -1);
  border-radius: 50%;
  border: 1px dashed rgba(12, 18, 34, 0.14);
  pointer-events: none;
}
.st-orbit-core {
  position: absolute;
  left: 50%; top: 50%;
  width: 76px; height: 76px;
  margin: -38px 0 0 -38px;
  display: grid; place-items: center;
  border-radius: 50%;
  z-index: 3;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(145deg, var(--st-signal), var(--st-deep));
  box-shadow: 0 0 0 8px rgba(0, 163, 196, 0.12);
  animation: stCorePulse 2.4s var(--ease) infinite;
}
.st-orbit-core span { position: relative; z-index: 1; }
.st-orbit-core::before {
  content: "";
  position: absolute;
  inset: -14px;
  border-radius: 50%;
  border: 1px solid rgba(0, 163, 196, 0.22);
  animation: stCoreRipple 2.4s var(--ease) infinite;
}
.st-orbit-node {
  position: absolute;
  left: 50%; top: 50%;
  width: 0; height: 0;
  transform: rotate(var(--a)) translateX(var(--orbit-r));
}
.st-orbit-node b {
  position: absolute;
  left: 0; top: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 64px;
  padding: 8px 12px;
  border-radius: 10px;
  background: var(--st-white);
  border: 1px solid var(--st-line);
  font-size: 12px;
  font-weight: 700;
  color: var(--st-ink);
  white-space: nowrap;
  box-shadow: 0 8px 20px rgba(12, 18, 34, 0.06);
  /* 抵消层旋转 + 节点初始角，标签始终正向 */
  transform: translate(-50%, -50%) rotate(calc(-1 * var(--a)));
  animation: stOrbitLabel var(--orbit-dur) linear infinite;
}
.st-orbit-layer-mid .st-orbit-node b {
  animation-name: stOrbitLabelRev;
}
.st-orbit-bubble {
  position: absolute;
  right: 4%;
  top: 14%;
  z-index: 4;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: 12px;
  background: var(--st-white);
  color: var(--st-ink);
  font-size: 13px;
  font-weight: 600;
  border: 1px solid var(--st-line);
  box-shadow: 0 12px 28px rgba(12, 18, 34, 0.08);
  animation: stBubblePop 4.8s var(--ease) infinite;
}
.st-orbit-bubble i {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--st-tally);
  box-shadow: 0 0 0 4px rgba(255, 92, 57, 0.2);
  flex-shrink: 0;
  animation: stPulse 1.4s var(--ease) infinite;
}
@keyframes stOrbitSpin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}
@keyframes stOrbitSpinRev {
  from { transform: rotate(0deg); }
  to { transform: rotate(-360deg); }
}
@keyframes stOrbitLabel {
  from { transform: translate(-50%, -50%) rotate(calc(-1 * var(--a))); }
  to { transform: translate(-50%, -50%) rotate(calc(-1 * var(--a) - 360deg)); }
}
@keyframes stOrbitLabelRev {
  from { transform: translate(-50%, -50%) rotate(calc(-1 * var(--a))); }
  to { transform: translate(-50%, -50%) rotate(calc(-1 * var(--a) + 360deg)); }
}
@keyframes stCorePulse {
  0%, 100% { box-shadow: 0 0 0 8px rgba(0, 163, 196, 0.12); transform: scale(1); }
  50% { box-shadow: 0 0 0 14px rgba(0, 163, 196, 0.08); transform: scale(1.03); }
}
@keyframes stCoreRipple {
  0% { transform: scale(0.92); opacity: 0.55; }
  70% { transform: scale(1.25); opacity: 0; }
  100% { transform: scale(1.25); opacity: 0; }
}
@keyframes stBubblePop {
  0%, 12% { opacity: 0; transform: translateY(10px) scale(0.96); }
  22%, 72% { opacity: 1; transform: translateY(0) scale(1); }
  88%, 100% { opacity: 0; transform: translateY(-8px) scale(0.98); }
}
@media (prefers-reduced-motion: reduce) {
  .st-orbit-layer-outer,
  .st-orbit-layer-mid,
  .st-orbit-layer-inner,
  .st-orbit-node b,
  .st-orbit-core,
  .st-orbit-core::before,
  .st-orbit-bubble,
  .st-orbit-bubble i { animation: none !important; }
  .st-orbit-bubble { opacity: 1; transform: none; }
  .st-orbit-node b { transform: translate(-50%, -50%) rotate(calc(-1 * var(--a))); }
}

/* —— AI ops brain band —— */
.st-brain {
  position: relative;
  padding: 96px 0;
  color: var(--st-ink);
  background: var(--st-paper);
  overflow: hidden;
}
.st-brain-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 48px;
  align-items: center;
}
.st-brain-viz {
  position: relative;
  width: min(100%, 420px);
  aspect-ratio: 1;
  margin-inline: auto;
  border-radius: 16px;
  background: linear-gradient(165deg, #fbfdff 0%, #eef6f9 100%);
}
.st-brain-rings {
  position: absolute;
  inset: 8%;
}
.st-brain-rings i {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 1px solid rgba(0, 163, 196, 0.22);
  animation: stBrainSpin 28s linear infinite;
}
.st-brain-rings .r2 { inset: 14%; animation-duration: 22s; animation-direction: reverse; border-color: rgba(0, 163, 196, 0.16); }
.st-brain-rings .r3 { inset: 28%; animation-duration: 16s; border-color: rgba(12, 18, 34, 0.08); }
.st-brain-rings .dot {
  position: absolute;
  left: 50%; top: 50%;
  width: 7px; height: 7px;
  margin: -3.5px 0 0 -3.5px;
  border-radius: 50%;
  background: var(--st-signal);
  box-shadow: 0 0 0 3px rgba(0, 163, 196, 0.16);
  transform: rotate(var(--a)) translateX(var(--r));
  animation: stPulse 2s var(--ease) infinite;
}
.st-brain-core {
  position: absolute;
  left: 50%; top: 50%;
  width: 120px;
  transform: translate(-50%, -50%);
  display: grid;
  justify-items: center;
  gap: 8px;
  z-index: 2;
  text-align: center;
}
.st-brain-core svg {
  width: 56px;
  height: 56px;
  color: var(--st-deep);
}
.st-brain-core strong {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--st-ink);
}
.st-brain-badge {
  position: absolute;
  top: 10%;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 10px;
  background: var(--st-white);
  border: 1px solid var(--st-line);
  font-size: 12px;
  font-weight: 700;
  color: var(--st-deep);
  white-space: nowrap;
}
.st-brain-badge i {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--st-signal);
  box-shadow: 0 0 0 3px rgba(0, 163, 196, 0.16);
  animation: stPulse 1.4s var(--ease) infinite;
}
.st-brain-stats {
  position: absolute;
  left: 12px;
  bottom: 12%;
  z-index: 3;
  display: grid;
  gap: 10px;
  min-width: 132px;
  padding: 14px 16px;
  border-radius: 12px;
  background: var(--st-white);
  border: 1px solid var(--st-line);
  box-shadow: 0 10px 24px rgba(12, 18, 34, 0.06);
}
.st-brain-stats span {
  display: block;
  font-size: 11px;
  color: var(--st-mute);
}
.st-brain-stats b {
  display: block;
  margin-top: 2px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--st-ink);
}
.st-brain-stats em {
  font-style: normal;
  color: var(--st-deep);
  font-size: 13px;
  margin-left: 2px;
}
.st-brain-tip {
  position: absolute;
  right: 12px;
  bottom: 18%;
  z-index: 3;
  max-width: 180px;
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 12px 14px;
  border-radius: 12px;
  background: var(--st-white);
  border: 1px solid rgba(0, 163, 196, 0.28);
  box-shadow: 0 10px 24px rgba(12, 18, 34, 0.06);
  font-size: 12px;
  font-weight: 600;
  line-height: 1.45;
  color: var(--st-ink);
  animation: stBubblePop 5.2s var(--ease) infinite;
}
.st-brain-tip i {
  width: 8px; height: 8px; border-radius: 50%;
  margin-top: 4px;
  flex-shrink: 0;
  background: var(--st-signal);
  box-shadow: 0 0 0 3px rgba(0, 163, 196, 0.16);
}
@keyframes stBrainSpin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}
@media (prefers-reduced-motion: reduce) {
  .st-brain-rings i,
  .st-brain-rings .dot,
  .st-brain-badge i,
  .st-brain-tip { animation: none !important; }
  .st-brain-tip { opacity: 1; transform: none; }
}

/* —— Multilingual band —— */
.st-langs {
  position: relative;
  padding: 96px 0;
  color: var(--st-ink);
  background: var(--st-paper);
  overflow: hidden;
}
.st-langs-grid {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: 56px;
  align-items: center;
}
.st-langs-rail {
  position: relative;
  height: 360px;
  padding: 8px;
  border-radius: 16px;
  background: linear-gradient(165deg, #fbfdff 0%, #eef6f9 100%);
  mask-image: linear-gradient(to bottom, transparent, #000 10%, #000 90%, transparent);
  -webkit-mask-image: linear-gradient(to bottom, transparent, #000 10%, #000 90%, transparent);
}
.st-langs-track {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  height: 100%;
}
.st-langs-col {
  display: flex;
  flex-direction: column;
  gap: 12px;
  animation: stLangScroll 28s linear infinite;
}
.st-langs-col-delay { animation-duration: 34s; animation-direction: reverse; }
@keyframes stLangScroll {
  0% { transform: translateY(0); }
  100% { transform: translateY(-50%); }
}
.st-lang-chip {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border-radius: 10px;
  background: var(--st-white);
  border: 1px solid var(--st-line);
  font-size: 14px;
  font-weight: 600;
  color: var(--st-ink);
  white-space: nowrap;
}
.st-lang-chip i {
  font-style: normal;
  font-size: 16px;
  line-height: 1;
  opacity: 0.9;
}
.st-langs-lead {
  margin: 14px 0 0;
  color: var(--st-mute);
  font-size: 16px;
  line-height: 1.6;
}
.st-langs-lead em {
  font-style: normal;
  font-weight: 700;
  color: var(--st-deep);
}
.st-langs-regions {
  margin-top: 20px;
  display: grid;
  gap: 8px;
  color: var(--st-mute);
  font-size: 15px;
  line-height: 1.5;
  text-wrap: pretty;
}
.st-langs-regions strong {
  color: var(--st-ink);
  font-weight: 600;
}
.st-langs-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
}
.st-langs-pills span {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  border-radius: 10px;
  border: 1px solid var(--st-line);
  background: var(--st-white);
  font-size: 13px;
  font-weight: 600;
  color: var(--st-ink);
}
@media (prefers-reduced-motion: reduce) {
  .st-langs-col, .st-langs-col-delay { animation: none; }
}

/* About Lingshi */
.st-about-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 36px 40px;
  margin-top: 8px;
}
.st-about-card {
  padding: 8px 0 0;
  border-top: 3px solid var(--st-signal);
}
.st-about-card h3 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
}
.st-about-card p {
  margin: 10px 0 0;
  color: var(--st-mute);
  font-size: 14px;
  line-height: 1.55;
}

/* Features — plain text grid */
.st-features {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 36px 40px;
}
.st-feat {
  padding: 0;
  background: none;
  border: 0;
}
.st-feat h3 {
  margin: 0; font-family: var(--font-display); font-size: 17px; font-weight: 700;
}
.st-feat p { margin: 10px 0 0; color: var(--st-mute); font-size: 14px; }

/* Scenes — open columns with accent rule (match plans / features) */
.st-scenes {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px 40px;
  margin-top: 8px;
}
.st-scene {
  padding: 8px 0 0;
  background: none;
  border: 0;
  border-top: 3px solid var(--st-signal);
  border-radius: 0;
  display: grid;
  gap: 0;
  transition: border-color 0.3s var(--ease);
}
.st-scene:hover {
  border-top-color: var(--st-deep);
}
.st-scene-featured {
  border-top-color: var(--st-tally);
}
.st-scene-featured:hover {
  border-top-color: #e04a2a;
}
.st-scene-icon {
  width: 36px;
  height: 36px;
  margin: 16px 0 14px;
  color: var(--st-deep);
}
.st-scene-icon svg { width: 100%; height: 100%; display: block; }
.st-scene-featured .st-scene-icon { color: var(--st-tally); }
.st-scene h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
  text-wrap: balance;
}
.st-scene-tag {
  margin: 8px 0 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--st-deep);
  text-wrap: pretty;
}
.st-scene-featured .st-scene-tag { color: var(--st-tally); }
.st-scene-desc {
  margin: 12px 0 0;
  font-size: 14px;
  color: var(--st-mute);
  line-height: 1.6;
  text-wrap: pretty;
}
.st-scene ul {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}
.st-scene li {
  position: relative;
  padding-left: 16px;
  color: var(--st-mute);
  font-size: 14px;
  line-height: 1.45;
}
.st-scene li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--st-signal);
}
.st-scene-featured li::before {
  background: var(--st-tally);
}

/* FAQ — hairline only */
.st-faq {
  display: grid; grid-template-columns: 1fr 1fr; gap: 0 48px;
  max-width: 920px; margin: 0 auto;
}
.st-faq details {
  border-bottom: 1px solid var(--st-line); padding: 18px 0;
}
.st-faq summary {
  cursor: pointer; list-style: none; display: flex; justify-content: space-between;
  gap: 16px; font-weight: 700; font-family: var(--font-display); font-size: 16px;
}
.st-faq summary::-webkit-details-marker { display: none; }
.st-faq summary::after { content: "+"; color: var(--st-signal); font-weight: 700; }
.st-faq details[open] summary::after { content: "−"; }
.st-faq p { margin: 10px 0 0; color: var(--st-mute); font-size: 14px; }

/* Close — full-bleed band, not a boxed card */
.st-close {
  padding: 0 0 0;
}
.st-close-card {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 28px;
  width: 100%;
  max-width: none;
  margin: 0;
  padding: 72px max(24px, calc((100% - 1120px) / 2));
  border-radius: 0;
  color: #fff;
  background:
    radial-gradient(ellipse 50% 80% at 90% 20%, rgba(0, 163, 196, 0.28), transparent 55%),
    linear-gradient(120deg, #0c1222 0%, #0b3a4a 55%, #0b6e8a 100%);
  box-shadow: none;
}
.st-close-card h2 {
  margin: 0; font-family: var(--font-display);
  font-size: clamp(26px, 3vw, 36px); letter-spacing: -0.02em;
}
.st-close-card p { margin: 10px 0 0; color: rgba(255,255,255,0.78); max-width: 36em; }
.st-close-card .st-btn-accent { background: #fff; color: var(--st-ink); }

/* Footer */
.st-foot {
  padding: 28px 0 40px; border-top: 1px solid var(--st-line);
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px;
  font-size: 13px; color: var(--st-mute);
}
.st-foot nav { display: flex; gap: 16px; }
.st-foot a:hover { color: var(--st-ink); }

/* Reveal */
.st-reveal {
  opacity: 0; transform: translateY(20px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.st-reveal.is-in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .st-reveal, .st-feed-card, .st-eyebrow i { animation: none !important; transition: none !important; }
  .st-reveal { opacity: 1; transform: none; }
}

@media (max-width: 960px) {
  .st-hero-grid { grid-template-columns: 1fr; gap: 36px; }
  .st-hero-tabs { max-width: 100%; }
  .st-langs-grid, .st-realtime-grid, .st-brain-grid { grid-template-columns: 1fr; gap: 36px; }
  .st-langs-rail { height: 220px; order: 2; }
  .st-langs-copy { order: 1; }
  .st-realtime-orbit, .st-brain-viz { width: min(100%, 340px); }
  .st-steps { grid-template-columns: 1fr; gap: 40px; }
  .st-step:not(:last-child)::before,
  .st-step:not(:last-child)::after { display: none; }
  .st-workflows, .st-features, .st-about-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .st-scenes { gap: 16px; }
  .st-nav-links { display: none; }
  .st-nav-toggle { display: inline-block; }
  .st-nav-lang,
  .st-nav-actions #navLogin { display: none !important; }
  .st-nav-actions { gap: 8px; }
  .st-nav.is-open .st-nav-links {
    display: flex; flex-direction: column; align-items: stretch; gap: 4px;
    position: absolute;
    left: 20px; right: 20px; top: 64px; padding: 16px 18px;
    background: var(--st-paper);
    border-bottom: 1px solid var(--st-line);
    z-index: 50;
  }
  .st-nav-dd-btn {
    width: 100%;
    justify-content: space-between;
    padding: 10px 0;
  }
  .st-nav-dd-panel {
    position: static;
    transform: none;
    min-width: 0;
    margin: 0 0 8px;
    box-shadow: none;
    border-radius: 10px;
  }
  .st-nav-dd:hover .st-nav-dd-panel {
    display: none;
  }
  .st-nav-dd.is-open .st-nav-dd-panel {
    display: flex;
    flex-direction: column;
    gap: 2px;
  }
}
@media (max-width: 640px) {
  .st-hero-tabs { display: grid; grid-template-columns: 1fr 1fr; width: 100%; border-radius: 14px; }
  .st-hero-tab { text-align: center; padding: 10px 8px; border-radius: 10px; }
}
@media (max-width: 640px) {
  .st-steps, .st-workflows, .st-features, .st-about-grid, .st-faq { grid-template-columns: 1fr; }
  .st-scenes { grid-template-columns: 1fr; }
  .st-close-card { padding: 56px 24px; }
}


/* —— Plans (homepage) —— */
.st-plan-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px 36px;
  margin-top: 8px;
}
.st-plan-loading,
.st-plan-msg {
  grid-column: 1 / -1;
  margin: 0;
  color: var(--st-mute);
  font-size: 15px;
}
.st-plan-msg.err { color: #b91c1c; }
.st-plan {
  position: relative;
  padding: 8px 0 0;
  border-top: 3px solid var(--st-signal);
}
.st-plan.is-featured { border-top-color: var(--st-tally); }
.st-plan-badge {
  position: absolute;
  top: -11px;
  right: 0;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  margin: 0;
  padding: 4px 10px;
  border-radius: 8px;
  background: var(--st-tally);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  line-height: 1.2;
  box-shadow: 0 6px 14px rgba(255, 92, 57, 0.28);
  pointer-events: none;
}
.st-plan h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
}
.st-plan-price {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.03em;
}
.st-plan-desc {
  margin-top: 12px;
  color: var(--st-mute);
  font-size: 14px;
  min-height: 3em;
}
.st-plan-desc em { color: var(--st-deep); font-style: normal; font-weight: 600; }
.st-plan-gifts {
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
  color: var(--st-mute);
  font-size: 14px;
}
.st-plan-gifts li {
  position: relative;
  padding-left: 16px;
}
.st-plan-gifts li::before {
  content: "";
  position: absolute;
  left: 0; top: 8px;
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--st-signal);
}
.st-plan .st-btn { margin-top: 18px; }
.st-plan-notes {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px 40px;
  margin-top: 40px;
}
.st-plan-note {
  color: var(--st-mute);
  font-size: 14px;
}
.st-plan-note strong {
  display: block;
  margin-bottom: 8px;
  color: var(--st-ink);
  font-family: var(--font-display);
  font-size: 15px;
}
.st-plan-note em { color: var(--st-deep); font-style: normal; font-weight: 600; }

@media (max-width: 960px) {
  .st-plan-grid { grid-template-columns: 1fr 1fr; }
  .st-plan-notes { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .st-plan-grid { grid-template-columns: 1fr; }
}