:root {
  --bg: var(--wh-bg, #f6f8f9);
  --surface: var(--wh-surface, #ffffff);
  --surface-alt: var(--wh-primary-soft, #e3f3f0);
  --ink: var(--wh-text, #0f172a);
  --muted: var(--wh-muted, #475569);
  --accent: var(--wh-primary, #0f766e);
  --accent-strong: var(--wh-primary-deep, #115e59);
  --secondary: var(--wh-secondary, #14b8a6);
  --on-accent: var(--on-primary, #ffffff);
  --hero-panel: var(--bg);
  --hero-mist: var(--surface);
  --hero-bubble: var(--surface-alt);
  --band-a: var(--ink);
  --band-b: var(--accent-strong);
  --line: rgba(15, 23, 42, 0.08);
  --line-strong: rgba(15, 23, 42, 0.14);
  --shadow-soft: 0 24px 70px rgba(15, 23, 42, 0.1);
  --shadow-card: 0 18px 40px rgba(15, 23, 42, 0.08);
  --shell: min(1200px, calc(100vw - 48px));
  --radius-xl: 32px;
  --radius-lg: 24px;
  --radius-md: 18px;
  --radius-sm: 14px;
  --space-7: 96px;
}

@supports (background: color-mix(in srgb, white 50%, black)) {
  :root {
    --hero-panel: color-mix(in srgb, var(--bg) 80%, var(--surface) 20%);
    --hero-mist: color-mix(in srgb, var(--surface) 86%, var(--secondary) 14%);
    --hero-bubble: color-mix(in srgb, var(--surface) 72%, var(--surface-alt) 28%);
    --band-a: color-mix(in srgb, var(--ink) 88%, var(--accent) 12%);
    --band-b: color-mix(in srgb, var(--ink) 74%, var(--secondary) 26%);
    --line: color-mix(in srgb, var(--ink) 8%, transparent);
    --line-strong: color-mix(in srgb, var(--ink) 14%, transparent);
    --shadow-soft: 0 24px 70px color-mix(in srgb, var(--ink) 12%, transparent);
    --shadow-card: 0 18px 40px color-mix(in srgb, var(--ink) 9%, transparent);
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Roboto", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top right, rgba(255, 255, 255, 0.9), transparent 34%),
    linear-gradient(180deg, var(--bg), var(--surface));
  line-height: 1.6;
  min-width: 320px;
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

p {
  margin: 0;
}

.qb-shell {
  width: var(--shell);
  margin: 0 auto;
}

.qb-header {
  position: sticky;
  top: 0;
  z-index: 30;
  border-bottom: 1px solid rgba(255, 255, 255, 0.5);
  backdrop-filter: blur(18px);
  background: rgba(255, 255, 255, 0.82);
}

.qb-header-inner {
  min-height: 88px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.qb-brand {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
}

.qb-brand img {
  width: auto;
  height: 48px;
}

.qb-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.qb-nav-link,
.qb-ghost-link {
  font-size: 15px;
  font-weight: 500;
  color: var(--muted);
  padding: 10px 16px;
  border-radius: 999px;
  transition: color 180ms ease, background-color 180ms ease;
}

.qb-nav-link:hover,
.qb-nav-link.is-active,
.qb-ghost-link:hover {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.8);
}

.qb-header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.qb-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  border-radius: 999px;
  padding: 0 28px;
  border: 1px solid transparent;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.01em;
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease, background-color 180ms ease, color 180ms ease;
}

.qb-btn:hover {
  transform: translateY(-2px);
}

.qb-btn-primary {
  background: var(--accent);
  color: var(--on-accent);
  box-shadow: 0 12px 26px rgba(15, 23, 42, 0.12);
}

.qb-btn-primary:hover {
  background: var(--accent-strong);
}

.qb-btn-secondary {
  background: rgba(255, 255, 255, 0.68);
  color: var(--ink);
  border-color: var(--line);
}

.qb-btn-secondary:hover {
  border-color: var(--line-strong);
}

.qb-btn-contrast {
  background: var(--surface);
  color: var(--ink);
  box-shadow: 0 18px 36px rgba(0, 0, 0, 0.12);
}

.qb-section {
  padding: var(--space-7) 0 0;
}

.qb-section-soft {
  padding-bottom: var(--space-7);
}

.qb-section-heading {
  max-width: 760px;
  margin-bottom: 36px;
}

.qb-section-label,
.qb-card-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  font-size: 12px;
  line-height: 1;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--muted);
  text-transform: uppercase;
}

.qb-section-label::before,
.qb-card-kicker::before {
  content: "";
  width: 34px;
  height: 1px;
  background: currentColor;
  opacity: 0.6;
}

.qb-section-heading h2,
.qb-page-hero h1,
.qb-hero h1,
.qb-news-body h2,
.qb-news-body h3,
.qb-feature-copy h3,
.qb-download-card h3,
.qb-flow-card h3,
.qb-reason-item h3,
.qb-sticky-card h2 {
  margin: 0;
  font-family: "Josefin Sans", "Trebuchet MS", "Segoe UI", sans-serif;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.qb-section-heading h2 {
  font-size: clamp(2rem, 3.2vw, 3rem);
  line-height: 1.08;
}

.qb-section-heading > p:last-child {
  margin-top: 14px;
  font-size: 17px;
  color: var(--muted);
}

.qb-hero {
  padding-top: 18px;
}

.qb-hero-inner {
  min-height: 580px;
  display: grid;
  grid-template-columns: minmax(320px, 1fr) minmax(360px, 1.15fr);
  align-items: stretch;
  gap: clamp(24px, 4vw, 56px);
  padding: clamp(38px, 5vw, 64px);
  border-radius: 28px 28px 0 0;
  overflow: hidden;
  background:
    radial-gradient(circle at 8% 78%, rgba(255, 255, 255, 0.95), transparent 28%),
    linear-gradient(135deg, var(--hero-panel), var(--hero-mist));
  box-shadow: var(--shadow-soft);
  position: relative;
}

.qb-hero-copy {
  align-self: center;
  max-width: 520px;
  position: relative;
  z-index: 2;
}

.qb-hero h1 {
  max-width: 460px;
  font-size: clamp(3rem, 5vw, 4.6rem);
  line-height: 0.98;
}

.qb-hero-line {
  max-width: 460px;
  margin-top: 18px;
  font-size: clamp(1.06rem, 1.8vw, 1.45rem);
  color: var(--ink);
}

.qb-hero-line-muted {
  margin-top: 8px;
  color: var(--muted);
}

.qb-hero-cta {
  margin-top: 42px;
}

.qb-hero-media {
  position: relative;
  min-height: 420px;
  display: flex;
  align-items: flex-end;
  justify-content: center;
}

.qb-hero-main {
  width: min(100%, 640px);
  max-height: 505px;
  object-fit: contain;
  position: relative;
  z-index: 2;
}

.qb-hero-orb {
  position: absolute;
  left: -4%;
  bottom: 18%;
  width: clamp(140px, 18vw, 240px);
  height: clamp(140px, 18vw, 240px);
  border-radius: 50%;
  background:
    radial-gradient(circle at 35% 35%, rgba(255, 255, 255, 0.9), transparent 40%),
    var(--hero-bubble);
  filter: blur(8px);
}

.qb-hero-chip {
  position: absolute;
  z-index: 3;
  border-radius: 24px;
  box-shadow: 0 20px 36px rgba(15, 23, 42, 0.08);
}

.qb-hero-chip-chat {
  width: clamp(84px, 10vw, 126px);
  left: -4%;
  top: 18%;
}

.qb-hero-chip-file {
  width: clamp(94px, 12vw, 140px);
  right: 3%;
  top: 14%;
}

.qb-hero-chip-like {
  width: clamp(86px, 10vw, 128px);
  right: 11%;
  bottom: 12%;
}

.qb-feature-stack {
  display: grid;
  gap: 24px;
}

.qb-feature-card,
.qb-content-panel,
.qb-download-card,
.qb-flow-card,
.qb-sticky-card,
.qb-news-card {
  border: 1px solid var(--line);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.88);
  box-shadow: var(--shadow-card);
}

.qb-feature-card {
  display: grid;
  grid-template-columns: minmax(280px, 440px) minmax(280px, 1fr);
  align-items: center;
  gap: clamp(18px, 4vw, 44px);
  padding: clamp(20px, 3vw, 40px);
}

.qb-feature-card-reverse {
  grid-template-columns: minmax(280px, 1fr) minmax(280px, 440px);
}

.qb-feature-card-reverse .qb-feature-media {
  order: 2;
}

.qb-feature-card-reverse .qb-feature-copy {
  order: 1;
}

.qb-feature-media {
  border-radius: 18px;
  overflow: hidden;
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.85), transparent 44%),
    linear-gradient(160deg, var(--hero-mist), var(--surface));
  padding: clamp(12px, 1.8vw, 18px);
}

.qb-feature-media img {
  width: 100%;
  border-radius: 12px;
}

.qb-feature-copy > p:not(.qb-card-kicker) {
  margin-top: 12px;
  color: var(--muted);
}

.qb-chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.qb-chip-list li {
  padding: 10px 14px;
  border-radius: 999px;
  background: var(--hero-bubble);
  border: 1px solid rgba(255, 255, 255, 0.7);
  font-size: 14px;
  font-weight: 600;
}

.qb-inline-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 24px;
  font-weight: 700;
  color: var(--accent);
}

.qb-inline-link::after {
  content: "→";
  transition: transform 180ms ease;
}

.qb-inline-link:hover::after {
  transform: translateX(3px);
}

.qb-reason-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  padding: clamp(24px, 4vw, 40px);
  border-radius: 40px;
  background:
    radial-gradient(circle at top right, rgba(255, 255, 255, 0.94), transparent 30%),
    linear-gradient(160deg, var(--hero-mist), var(--surface));
  border: 1px solid var(--line);
}

.qb-reason-item {
  min-height: 240px;
  padding: clamp(18px, 2.6vw, 28px);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.74);
  border: 1px solid rgba(255, 255, 255, 0.78);
}

.qb-reason-index,
.qb-flow-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 68px;
  height: 32px;
  padding: 0 12px;
  border-radius: 999px;
  background: var(--hero-bubble);
  color: var(--accent);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.14em;
}

.qb-reason-item h3,
.qb-flow-card h3,
.qb-download-card h3 {
  margin-top: 18px;
  font-size: 1.5rem;
  line-height: 1.08;
}

.qb-reason-item p,
.qb-flow-card p,
.qb-download-card p,
.qb-sticky-card p,
.qb-list-summary p,
.qb-page-hero-copy {
  margin-top: 12px;
  color: var(--muted);
}

.qb-news-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.qb-news-grid-full {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.qb-news-card {
  overflow: hidden;
}

.qb-news-cover {
  display: block;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.75), transparent 40%),
    linear-gradient(160deg, var(--hero-mist), var(--surface));
}

.qb-news-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 220ms ease;
}

.qb-news-card:hover .qb-news-cover img {
  transform: scale(1.03);
}

.qb-news-body {
  padding: 22px;
}

.qb-news-body h2,
.qb-news-body h3 {
  font-size: clamp(1.25rem, 2vw, 1.8rem);
  line-height: 1.12;
}

.qb-news-body p:not(.qb-card-kicker) {
  margin-top: 12px;
  color: var(--muted);
}

.qb-news-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 12px;
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
}

.qb-center-link {
  margin-top: 30px;
  display: flex;
  justify-content: center;
}

.qb-page-hero {
  padding-top: 18px;
}

.qb-page-hero-inner {
  display: grid;
  grid-template-columns: minmax(320px, 1.1fr) minmax(280px, 0.9fr);
  gap: clamp(20px, 4vw, 44px);
  align-items: center;
  padding: clamp(34px, 4vw, 54px);
  border-radius: 28px;
  background:
    radial-gradient(circle at 92% 16%, rgba(255, 255, 255, 0.9), transparent 22%),
    linear-gradient(135deg, var(--hero-panel), var(--hero-mist));
  box-shadow: var(--shadow-soft);
}

.qb-page-hero h1 {
  font-size: clamp(2.4rem, 4vw, 4rem);
  line-height: 1.02;
}

.qb-page-hero-compact h1 {
  font-size: clamp(2.2rem, 3.6vw, 3.4rem);
}

.qb-list-summary,
.qb-page-hero-card {
  border-radius: 24px;
  border: 1px solid rgba(255, 255, 255, 0.78);
  background: rgba(255, 255, 255, 0.76);
}

.qb-list-summary {
  padding: 24px;
}

.qb-list-summary span {
  font-size: 2.2rem;
  line-height: 1;
  font-weight: 800;
  font-family: "Josefin Sans", "Trebuchet MS", "Segoe UI", sans-serif;
}

.qb-page-hero-card {
  padding: clamp(14px, 2vw, 18px);
}

.qb-page-hero-card img {
  width: 100%;
  border-radius: 16px;
}

.qb-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

.qb-flow-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.qb-flow-card,
.qb-download-card {
  padding: 26px;
}

.qb-download-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.qb-download-card .qb-btn {
  margin-top: 24px;
}

.qb-article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) minmax(260px, 0.8fr);
  gap: 28px;
  align-items: start;
}

.qb-content-panel {
  padding: clamp(22px, 3vw, 38px);
}

.qb-side-panel {
  display: grid;
  gap: 18px;
}

.qb-sticky-card {
  padding: 24px;
  position: sticky;
  top: 110px;
}

.qb-sticky-card + .qb-sticky-card {
  top: 332px;
}

.qb-side-links {
  display: grid;
  gap: 12px;
  margin-top: 14px;
}

.qb-side-links a {
  font-weight: 600;
}

.qb-article-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
  font-size: 13px;
  font-weight: 700;
  color: var(--muted);
}

.qb-prose {
  font-size: 17px;
  line-height: 1.78;
}

.qb-prose > :first-child {
  margin-top: 0;
}

.qb-prose h2,
.qb-prose h3,
.qb-prose h4 {
  margin: 2.2em 0 0.75em;
  line-height: 1.18;
  font-family: "Josefin Sans", "Trebuchet MS", "Segoe UI", sans-serif;
}

.qb-prose p,
.qb-prose ul,
.qb-prose ol,
.qb-prose blockquote {
  margin: 1em 0 0;
}

.qb-prose ul,
.qb-prose ol {
  padding-left: 1.25em;
}

.qb-prose li + li {
  margin-top: 0.4em;
}

.qb-prose img {
  border-radius: 16px;
  margin: 1.4em 0;
}

.qb-prose a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
}

.qb-prose blockquote {
  padding: 18px 20px;
  border-left: 4px solid var(--accent);
  border-radius: 0 14px 14px 0;
  background: var(--hero-bubble);
}

.qb-footer {
  padding-top: var(--space-7);
}

.qb-footer-band {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(circle at 90% 90%, rgba(255, 255, 255, 0.08), transparent 18%),
    radial-gradient(circle at 18% 12%, rgba(255, 255, 255, 0.06), transparent 26%),
    linear-gradient(135deg, var(--band-a), var(--band-b));
}

.qb-footer-band-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  padding: clamp(34px, 4vw, 56px) 0;
}

.qb-footer-band h2 {
  margin: 0;
  color: var(--on-accent);
  font-size: clamp(2rem, 3.1vw, 3rem);
  line-height: 1.08;
  font-family: "Josefin Sans", "Trebuchet MS", "Segoe UI", sans-serif;
}

.qb-footer-band .qb-section-label,
.qb-footer-band p {
  color: rgba(255, 255, 255, 0.8);
}

.qb-footer-meta {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) auto auto;
  gap: 28px;
  align-items: center;
  padding: 34px 0 54px;
}

.qb-footer-brand {
  display: flex;
  align-items: center;
  gap: 18px;
}

.qb-footer-brand img {
  height: 42px;
  width: auto;
}

.qb-footer-brand p,
.qb-footer-copy {
  color: var(--muted);
  font-size: 14px;
}

.qb-footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-weight: 600;
}

@media (max-width: 1120px) {
  .qb-header-inner,
  .qb-footer-band-inner,
  .qb-footer-meta,
  .qb-hero-inner,
  .qb-page-hero-inner,
  .qb-feature-card,
  .qb-feature-card-reverse,
  .qb-article-layout {
    grid-template-columns: 1fr;
    flex-direction: column;
    align-items: stretch;
  }

  .qb-header-inner {
    min-height: auto;
    padding: 16px 0;
  }

  .qb-nav,
  .qb-header-actions {
    width: 100%;
    justify-content: center;
    flex-wrap: wrap;
  }

  .qb-footer-meta {
    grid-template-columns: 1fr;
  }

  .qb-news-grid,
  .qb-news-grid-full,
  .qb-flow-grid,
  .qb-download-grid,
  .qb-reason-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .qb-sticky-card,
  .qb-sticky-card + .qb-sticky-card {
    position: static;
  }

  .qb-feature-card-reverse .qb-feature-media,
  .qb-feature-card-reverse .qb-feature-copy {
    order: initial;
  }
}

@media (max-width: 780px) {
  :root {
    --shell: min(100vw - 28px, 100%);
    --space-7: 72px;
  }

  .qb-header {
    position: static;
    backdrop-filter: none;
  }

  .qb-brand img {
    height: 40px;
  }

  .qb-nav {
    gap: 6px;
  }

  .qb-nav-link,
  .qb-ghost-link {
    padding: 8px 12px;
    font-size: 14px;
  }

  .qb-btn {
    width: 100%;
  }

  .qb-hero-inner {
    min-height: auto;
    padding: 28px 22px 24px;
    border-radius: 24px;
  }

  .qb-hero h1,
  .qb-page-hero h1 {
    font-size: clamp(2.2rem, 9vw, 3.3rem);
  }

  .qb-hero-copy,
  .qb-page-hero-copy {
    max-width: none;
  }

  .qb-hero-cta {
    margin-top: 28px;
  }

  .qb-hero-media {
    min-height: 0;
    padding-top: 12px;
  }

  .qb-hero-main {
    width: 100%;
    max-height: none;
  }

  .qb-hero-chip-chat {
    left: 0;
    top: 6%;
  }

  .qb-hero-chip-file {
    right: 2%;
    top: 4%;
  }

  .qb-hero-chip-like {
    right: 6%;
    bottom: 2%;
  }

  .qb-news-grid,
  .qb-news-grid-full,
  .qb-flow-grid,
  .qb-download-grid,
  .qb-reason-grid {
    grid-template-columns: 1fr;
  }

  .qb-reason-grid,
  .qb-page-hero-inner,
  .qb-flow-card,
  .qb-download-card,
  .qb-news-body,
  .qb-content-panel,
  .qb-sticky-card {
    padding-left: 20px;
    padding-right: 20px;
  }

  .qb-footer-brand {
    align-items: flex-start;
    flex-direction: column;
  }
}