:root {
  --bg: #050816;
  --bg-deep: #02040d;
  --surface: #0b0f1f;
  --ink: #f7f8fb;
  --muted: #aab2c3;
  --line: rgba(255, 255, 255, 0.12);
  --line-strong: rgba(255, 255, 255, 0.22);
  --paper: #f2f2ee;
  --paper-ink: #090b12;
  --orange: #ff8a22;
  --pink: #ff3f91;
  --violet: #8b4dff;
  --blue: #3478ff;
  --cyan: #12d9ef;
  --gradient: linear-gradient(96deg, var(--orange), var(--pink) 30%, var(--violet) 57%, var(--blue) 78%, var(--cyan));
  --content: 1360px;
  --gutter: 18px;
  --radius: 22px;
  --header-height: 72px;
  --progress-height: 58px;
}

*,
*::before,
*::after { box-sizing: border-box; }

html {
  background: var(--bg);
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + var(--progress-height) + 12px);
}

body {
  margin: 0;
  overflow-x: hidden;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  text-rendering: optimizeLegibility;
}

img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { color: inherit; font: inherit; cursor: pointer; }
fieldset { min-width: 0; }
[hidden] { display: none !important; }
::selection { background: var(--pink); color: white; }
:focus-visible { outline: 3px solid var(--cyan); outline-offset: 4px; }

.skip-link {
  position: fixed;
  top: 10px;
  left: 12px;
  z-index: 1000;
  min-height: 44px;
  padding: 12px 16px;
  border-radius: 8px;
  background: white;
  color: #060914;
  font-weight: 800;
  transform: translateY(-160%);
  transition: transform 0.2s ease;
}

.skip-link:focus { transform: none; }

.case-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  align-items: center;
  gap: 10px;
  min-height: var(--header-height);
  padding: 8px var(--gutter);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(3, 5, 14, 0.92);
  backdrop-filter: blur(20px);
}

.case-brand { width: 132px; }
.case-brand img { width: 100%; }
.case-type,
.case-nav { display: none; }

.case-language-switcher {
  display: inline-flex;
  min-height: 36px;
  align-items: center;
  gap: 2px;
  color: #79849b;
  font-size: 0.64rem;
  font-weight: 820;
}

.case-language-switcher button {
  min-width: 29px;
  min-height: 36px;
  padding: 0 4px;
  border: 0;
  background: transparent;
  color: #79849b;
}

.case-language-switcher button.is-active { color: white; }

.header-demo-link {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 0.67rem;
  font-weight: 820;
  white-space: nowrap;
}

.experience-journey {
  position: fixed;
  top: var(--header-height);
  right: 0;
  left: 0;
  z-index: 90;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  min-height: var(--progress-height);
  padding: 0 var(--gutter);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(5, 8, 22, 0.94);
  backdrop-filter: blur(18px);
}

.experience-journey a {
  position: relative;
  display: grid;
  min-width: 0;
  align-content: center;
  gap: 2px;
  padding: 8px 6px;
  color: #7e899e;
}

.experience-journey a::after {
  position: absolute;
  right: 6px;
  bottom: 0;
  left: 6px;
  height: 2px;
  background: transparent;
  content: "";
}

.experience-journey a:not(:last-child)::before {
  position: absolute;
  top: 50%;
  right: -3px;
  color: #414b61;
  content: "→";
  font-size: 0.62rem;
  transform: translateY(-50%);
}

.experience-journey a[aria-current="step"] { color: white; }
.experience-journey a[aria-current="step"]::after { background: var(--gradient); }
.experience-journey span { font-size: 0.52rem; font-weight: 820; letter-spacing: 0.08em; }
.experience-journey strong { overflow: hidden; font-size: 0.62rem; text-overflow: ellipsis; white-space: nowrap; }

.eyebrow {
  margin: 0 0 16px;
  color: #95a8e8;
  font-size: 0.66rem;
  font-weight: 840;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.button {
  display: inline-flex;
  width: 100%;
  min-height: 52px;
  align-items: center;
  justify-content: center;
  padding: 14px 20px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 840;
  text-align: center;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.button:hover { border-color: rgba(255, 255, 255, 0.36); transform: translateY(-2px); }
.button--gradient { border-color: transparent; background: var(--gradient); box-shadow: 0 16px 42px rgba(82, 71, 255, 0.2); color: white; }
.button--quiet { background: rgba(255, 255, 255, 0.035); }
.button--dark { border-color: rgba(6, 9, 20, 0.18); background: #080b16; color: white; }

.guided-hero {
  display: grid;
  min-height: 100svh;
  align-content: center;
  gap: 42px;
  padding: calc(var(--header-height) + var(--progress-height) + 48px) var(--gutter) 46px;
  background:
    radial-gradient(circle at 92% 18%, rgba(52, 120, 255, 0.16), transparent 21rem),
    radial-gradient(circle at 8% 76%, rgba(139, 77, 255, 0.1), transparent 18rem),
    var(--bg);
}

.guided-hero__content { max-width: 1040px; }

.guided-hero h1 {
  max-width: 1040px;
  margin: 0;
  font-size: clamp(3rem, 12.8vw, 7rem);
  font-weight: 900;
  letter-spacing: -0.07em;
  line-height: 0.91;
}

.guided-hero h1 span {
  background: var(--gradient);
  background-clip: text;
  color: transparent;
}

html[data-language="zh"] .guided-hero h1 { font-size: clamp(2.6rem, 11vw, 6.8rem); line-height: 0.98; }

.hero-summary {
  max-width: 710px;
  margin: 26px 0 0;
  color: #bac2d0;
  font-size: 1rem;
  line-height: 1.65;
}

.hero-actions { display: grid; gap: 10px; margin-top: 30px; }

.demo-disclaimer {
  display: grid;
  gap: 5px;
  max-width: 710px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  color: #919bae;
  font-size: 0.72rem;
  line-height: 1.45;
}

.demo-disclaimer strong { color: white; font-size: 0.62rem; letter-spacing: 0.11em; text-transform: uppercase; }

.change-section,
.system-section,
.diagnostic-section,
.analysis-cta { padding: 78px var(--gutter); }

.change-section,
.analysis-cta { background: var(--paper); color: var(--paper-ink); }
.system-section { background: #050713; }
.diagnostic-section { background: #090d1b; }

.section-intro { max-width: 900px; margin-bottom: 36px; }
.section-intro h2,
.analysis-cta h2 {
  margin: 0;
  font-size: clamp(2.65rem, 11vw, 6rem);
  font-weight: 900;
  letter-spacing: -0.065em;
  line-height: 0.94;
}

.section-intro h2 span,
.analysis-cta h2 span {
  background: var(--gradient);
  background-clip: text;
  color: transparent;
}

.change-section .eyebrow,
.analysis-cta .eyebrow { color: #59637b; }

.section-intro > p:last-child {
  max-width: 690px;
  margin: 22px 0 0;
  color: #596173;
  font-size: 0.92rem;
  line-height: 1.65;
}

.section-intro--dark > p:last-child,
.diagnostic-section .section-intro > p:last-child { color: var(--muted); }

.state-switcher {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  padding: 5px;
  border: 1px solid rgba(7, 10, 20, 0.14);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.6);
}

.state-switcher button {
  min-height: 44px;
  padding: 10px 12px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: #5d6575;
  font-size: 0.75rem;
  font-weight: 840;
}

.state-switcher button[aria-pressed="true"] { background: #080b16; color: white; }
.state-switcher > span { color: #626a79; font-size: 0.55rem; font-weight: 900; letter-spacing: 0.12em; }

.before-after { display: grid; gap: 14px; }
.business-state { overflow: hidden; border: 1px solid rgba(7, 10, 20, 0.14); border-radius: var(--radius); background: white; }
.business-state header { padding: 24px 20px; border-bottom: 1px solid rgba(7, 10, 20, 0.1); }
.business-state header > span { color: #687188; font-size: 0.62rem; font-weight: 850; letter-spacing: 0.14em; }
.business-state h3 { margin: 14px 0 0; font-size: 1.65rem; letter-spacing: -0.045em; line-height: 1.05; }
.business-state dl { margin: 0; }
.business-state dl div { display: grid; grid-template-columns: 78px 1fr; gap: 14px; padding: 18px 20px; border-bottom: 1px solid rgba(7, 10, 20, 0.09); }
.business-state dl div:last-child { border-bottom: 0; }
.business-state dt { font-size: 0.75rem; font-weight: 850; }
.business-state dd { margin: 0; color: #596173; font-size: 0.78rem; line-height: 1.55; }
.business-state--after { border-color: rgba(52, 120, 255, 0.28); box-shadow: 0 18px 60px rgba(69, 68, 180, 0.1); }

.reshift-bridge {
  display: grid;
  justify-items: center;
  gap: 4px;
  padding: 10px 0;
  color: #111522;
  text-align: center;
}

.reshift-bridge img { width: 52px; mix-blend-mode: multiply; }
.reshift-bridge strong { font-size: 0.73rem; letter-spacing: 0.12em; }
.reshift-bridge span { color: #5f6777; font-size: 0.65rem; }

.business-layers {
  position: relative;
  display: grid;
  gap: 10px;
  max-width: 920px;
  margin: 0 auto;
  padding: 0;
  list-style: none;
}

.business-layers::before {
  position: absolute;
  top: 36px;
  bottom: 36px;
  left: 31px;
  width: 1px;
  background: linear-gradient(var(--orange), var(--violet), var(--cyan));
  content: "";
}

.business-layers li {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 34px 1fr;
  align-items: center;
  gap: 16px;
  min-height: 110px;
  padding: 20px 20px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #0a0e1d;
}

.business-layers li > span {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: #070a15;
  color: #9ca8c1;
  font-size: 0.58rem;
  font-weight: 850;
}

.business-layers strong { font-size: 1.35rem; letter-spacing: -0.035em; }
.business-layers p { margin: 7px 0 0; color: #939db1; font-size: 0.76rem; line-height: 1.45; }

.full-transformation {
  max-width: 920px;
  margin: 16px auto 0;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.025);
}

.full-transformation summary {
  display: flex;
  min-height: 64px;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 16px 20px;
  font-size: 0.8rem;
  font-weight: 840;
  cursor: pointer;
  list-style: none;
}

.full-transformation summary::-webkit-details-marker { display: none; }
.full-transformation summary strong { font-size: 1.25rem; font-weight: 400; transition: transform 0.2s ease; }
.full-transformation[open] summary strong { transform: rotate(45deg); }
.transformation-details { padding: 4px 20px 24px; border-top: 1px solid var(--line); }
.details-intro { max-width: 720px; margin: 22px 0; color: #a8b0c0; font-size: 0.8rem; line-height: 1.65; }
.detail-grid { display: grid; gap: 8px; }
.detail-grid article { padding: 18px; border: 1px solid var(--line); border-radius: 14px; background: rgba(255, 255, 255, 0.025); }
.detail-grid article > span { color: #8290b5; font-size: 0.6rem; font-weight: 850; }
.detail-grid h3 { margin: 14px 0 8px; font-size: 0.94rem; }
.detail-grid p { margin: 0; color: #9fa8ba; font-size: 0.76rem; line-height: 1.6; }
.text-link { display: inline-flex; min-height: 46px; align-items: center; margin-top: 18px; color: #d9deea; font-size: 0.77rem; font-weight: 820; text-decoration: underline; text-underline-offset: 5px; }

.guided-diagnostic { display: grid; gap: 14px; }
.gap-areas { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin: 0; padding: 0; border: 0; }
.gap-areas legend { grid-column: 1 / -1; width: 100%; margin-bottom: 10px; color: #d7dce6; font-size: 0.75rem; font-weight: 820; }
.gap-areas button {
  display: grid;
  min-height: 132px;
  align-content: space-between;
  justify-items: start;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #0d1223;
  text-align: left;
}

.gap-areas button:hover,
.gap-areas button.is-active { border-color: rgba(18, 217, 239, 0.62); background: rgba(18, 217, 239, 0.07); }
.gap-areas button > span { color: #7481a6; font-size: 0.58rem; font-weight: 850; }
.gap-areas button strong { margin-top: 24px; font-size: 0.96rem; }
.gap-areas button small { margin-top: 6px; color: #8d98ad; font-size: 0.63rem; line-height: 1.35; }

.question-stage {
  min-height: 300px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #060916;
}

.diagnostic-placeholder { display: grid; min-height: 250px; place-content: center; text-align: center; }
.diagnostic-placeholder span { color: #8492b8; font-size: 0.62rem; font-weight: 850; letter-spacing: 0.12em; text-transform: uppercase; }
.diagnostic-placeholder p { margin: 12px 0 0; color: #8f99ad; font-size: 0.78rem; }
.diagnostic-questions > header { display: flex; align-items: end; justify-content: space-between; gap: 16px; padding-bottom: 18px; border-bottom: 1px solid var(--line); }
.diagnostic-questions > header h3 { margin: 0; font-size: 1.25rem; }
.diagnostic-questions > header span { color: #8793ab; font-size: 0.62rem; font-weight: 820; }
.diagnostic-question { padding: 20px 0; border-bottom: 1px solid var(--line); }
.diagnostic-question p { margin: 0 0 14px; color: #e4e7ed; font-size: 0.85rem; line-height: 1.5; }
.answer-options { display: grid; grid-template-columns: repeat(3, 1fr); gap: 7px; }
.answer-options button {
  min-height: 46px;
  padding: 10px 7px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.025);
  color: #aeb7c7;
  font-size: 0.7rem;
  font-weight: 780;
}

.answer-options button:hover,
.answer-options button.is-selected { border-color: rgba(18, 217, 239, 0.62); background: rgba(18, 217, 239, 0.1); color: white; }
.diagnostic-result { margin-top: 20px; padding: 22px 20px; border: 1px solid rgba(139, 77, 255, 0.42); border-radius: 18px; background: rgba(139, 77, 255, 0.1); }
.diagnostic-result > span { color: #a3afe0; font-size: 0.6rem; font-weight: 850; letter-spacing: 0.12em; text-transform: uppercase; }
.diagnostic-result h3 { margin: 14px 0 8px; font-size: 1.45rem; letter-spacing: -0.035em; }
.diagnostic-result p { margin: 0 0 20px; color: #b0b8c7; font-size: 0.8rem; line-height: 1.6; }

.analysis-cta { display: grid; gap: 34px; }
.analysis-cta h2 { max-width: 980px; }
.analysis-actions { display: grid; gap: 10px; }

.case-footer {
  display: grid;
  gap: 24px;
  padding: 48px var(--gutter) calc(38px + env(safe-area-inset-bottom));
  border-top: 1px solid var(--line);
  background: var(--bg-deep);
}

.case-footer > a { width: 190px; }
.case-footer p { max-width: 650px; margin: 0; color: #8f99ad; font-size: 0.75rem; line-height: 1.65; }
.case-footer > div { display: flex; flex-wrap: wrap; gap: 18px; color: #d8dce5; font-size: 0.73rem; font-weight: 760; }

@media (min-width: 760px) {
  :root { --gutter: clamp(28px, 5vw, 72px); --radius: 26px; --header-height: 80px; --progress-height: 58px; }
  html { scroll-padding-top: calc(var(--header-height) + var(--progress-height) + 12px); }
  .case-header { grid-template-columns: 190px auto 1fr auto auto; min-height: var(--header-height); }
  .case-brand { width: 184px; }
  .case-type { display: block; color: #7d879b; font-size: 0.62rem; font-weight: 800; letter-spacing: 0.11em; text-transform: uppercase; }
  .case-nav { display: flex; justify-content: center; gap: 24px; color: #d0d5df; font-size: 0.72rem; font-weight: 760; }
  .header-demo-link { padding-inline: 18px; }
  .experience-journey { padding-inline: max(var(--gutter), calc((100vw - var(--content)) / 2)); }
  .experience-journey a { grid-template-columns: auto auto; justify-content: start; gap: 8px; padding-inline: 14px; }
  .experience-journey a:first-child { padding-left: 0; }
  .guided-hero { min-height: 100vh; padding-top: calc(var(--header-height) + var(--progress-height) + 54px); padding-bottom: 64px; }
  .guided-hero h1 { font-size: clamp(5rem, 7.4vw, 7.6rem); }
  .hero-actions { grid-template-columns: max-content max-content; }
  .button { width: auto; min-width: 220px; }
  .demo-disclaimer { grid-template-columns: auto 1fr; align-items: center; gap: 18px; }
  .change-section,
  .system-section,
  .diagnostic-section,
  .analysis-cta { padding-block: 108px; }
  .section-intro { margin-bottom: 50px; }
  .state-switcher { display: none; }
  .before-after { grid-template-columns: 1fr 120px 1fr; align-items: stretch; gap: 18px; }
  .business-state[hidden] { display: block !important; }
  .reshift-bridge { align-content: center; }
  .reshift-bridge img { width: 74px; }
  .business-state header { padding: 28px; }
  .business-state dl div { grid-template-columns: 110px 1fr; padding: 20px 28px; }
  .business-layers li { grid-template-columns: 46px 1fr; min-height: 126px; padding: 24px 28px; }
  .business-layers li > span { width: 46px; height: 46px; }
  .business-layers::before { left: 50px; }
  .business-layers strong { font-size: 1.7rem; }
  .business-layers p { font-size: 0.86rem; }
  .transformation-details { padding: 10px 28px 30px; }
  .detail-grid { grid-template-columns: repeat(2, 1fr); }
  .guided-diagnostic { grid-template-columns: minmax(0, 0.82fr) minmax(430px, 1.18fr); align-items: start; gap: 24px; }
  .gap-areas { gap: 10px; }
  .gap-areas button { min-height: 160px; padding: 20px; }
  .question-stage { min-height: 520px; padding: 28px; }
  .diagnostic-placeholder { min-height: 460px; }
  .analysis-cta { grid-template-columns: 1.35fr 0.65fr; align-items: end; }
  .analysis-actions { justify-items: stretch; }
  .analysis-actions .button { width: 100%; }
  .case-footer { grid-template-columns: 210px 1fr auto; align-items: center; }
}

@media (min-width: 1120px) {
  .guided-hero { padding-left: max(var(--gutter), calc((100vw - var(--content)) / 2)); padding-right: max(var(--gutter), calc((100vw - var(--content)) / 2)); }
  .change-section,
  .system-section,
  .diagnostic-section,
  .analysis-cta,
  .case-footer { padding-left: max(var(--gutter), calc((100vw - var(--content)) / 2)); padding-right: max(var(--gutter), calc((100vw - var(--content)) / 2)); }
  .detail-grid { grid-template-columns: repeat(3, 1fr); }
  .detail-grid article:last-child { grid-column: 2; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}