:root {
  --ink: #15202b;
  --ink-soft: #3a4a58;
  --rose: #e85a71;
  --rose-deep: #c93d56;
  --aqua: #2fbfae;
  --aqua-soft: #a8ebe2;
  --mist: #eef6f7;
  --cloud: #ffffff;
  --blush: #ffe8ec;
  --sand: #fff7f0;
  --line: rgba(21, 32, 43, 0.08);
  --glass: rgba(255, 255, 255, 0.55);
  --shadow: 0 18px 40px rgba(21, 32, 43, 0.1);
  --radius: 22px;
  --max: 1080px;
  --nav-h: 64px;
  --font-brand: "ZCOOL KuaiLe", "PingFang SC", sans-serif;
  --font-display: "Noto Serif SC", "Songti SC", serif;
  --font-body: "Noto Sans SC", "PingFang SC", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(232, 90, 113, 0.18), transparent 55%),
    radial-gradient(900px 500px at 100% 0%, rgba(47, 191, 174, 0.2), transparent 50%),
    linear-gradient(180deg, var(--sand) 0%, var(--mist) 38%, #f7fbfd 100%);
  min-height: 100vh;
  overflow-x: hidden;
}

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

a {
  color: var(--rose-deep);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--aqua);
}

.bc-wrap {
  width: min(100% - 32px, var(--max));
  margin-inline: auto;
}

.bc-topbar {
  position: sticky;
  top: 0;
  z-index: 80;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(255, 247, 240, 0.78);
  border-bottom: 1px solid var(--line);
}

.bc-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  min-height: var(--nav-h);
  gap: 10px 16px;
  position: relative;
}

.bc-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
  font-family: var(--font-brand);
  font-size: 1.35rem;
  letter-spacing: 0.04em;
}

.bc-brand img {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  box-shadow: 0 8px 18px rgba(232, 90, 113, 0.28);
}

.bc-burger {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.72);
  cursor: pointer;
  margin-left: auto;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.bc-burger span {
  display: block;
  height: 2px;
  width: 100%;
  border-radius: 2px;
  background: var(--ink);
  transition: transform 0.25s ease, opacity 0.2s ease;
  transform-origin: center;
}

.bc-burger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.bc-burger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.bc-burger[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.bc-menu {
  display: none;
  width: 100%;
  flex-direction: column;
  gap: 4px;
  padding: 8px 0 14px;
  border-top: 1px solid var(--line);
}

.bc-menu.is-open {
  display: flex;
}

.bc-menu a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 0.98rem;
  padding: 12px 10px;
  border-radius: 12px;
  position: relative;
}

.bc-menu a:hover,
.bc-menu a.is-active {
  background: linear-gradient(90deg, rgba(232, 90, 113, 0.1), rgba(47, 191, 174, 0.1));
  color: var(--ink);
}

.bc-menu a::after {
  content: none;
}

@media (min-width: 768px) {
  .bc-burger {
    display: none;
  }

  .bc-menu {
    display: flex;
    width: auto;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 8px 14px;
    justify-content: flex-end;
    padding: 0;
    border-top: none;
  }

  .bc-menu.is-open {
    display: flex;
  }

  .bc-menu a {
    padding: 6px 0;
    border-radius: 0;
    font-size: 0.92rem;
  }

  .bc-menu a:hover,
  .bc-menu a.is-active {
    background: transparent;
  }

  .bc-menu a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 2px;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--rose), var(--aqua));
    transition: width 0.25s ease;
  }

  .bc-menu a:hover::after,
  .bc-menu a.is-active::after {
    width: 100%;
  }
}

.bc-promo-shell {
  border-bottom: 1px solid var(--line);
  background: linear-gradient(90deg, rgba(255, 232, 236, 0.85), rgba(168, 235, 226, 0.45));
}

.bc-promo-rail {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 10px;
  justify-content: center;
  padding: 12px 0;
}

.bc-promo-item {
  width: 70px;
  text-decoration: none;
  color: var(--ink-soft);
  text-align: center;
  font-size: 11px;
}

.bc-promo-item img {
  width: 56px;
  height: 56px;
  margin: 0 auto 4px;
  border-radius: 16px;
  object-fit: cover;
  box-shadow: 0 8px 16px rgba(21, 32, 43, 0.12);
  transition: transform 0.2s ease;
}

.bc-promo-item:hover img {
  transform: translateY(-3px) scale(1.04);
}

.bc-promo-item span {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.bc-sticky-dock {
  position: sticky;
  top: var(--nav-h);
  z-index: 70;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  pointer-events: none;
  transition: max-height 0.28s ease, opacity 0.28s ease;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.bc-sticky-dock.is-visible {
  max-height: 220px;
  opacity: 1;
  pointer-events: auto;
}

.bc-dock-label {
  font-size: 0.78rem;
  color: var(--ink-soft);
  padding: 8px 0 0;
}

.bc-dock-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px 8px;
  padding: 8px 0 12px;
}

.bc-dock-item {
  text-decoration: none;
  color: var(--ink-soft);
  text-align: center;
  font-size: 11px;
}

.bc-dock-item img {
  width: 48px;
  height: 48px;
  margin: 0 auto 4px;
  border-radius: 14px;
  object-fit: cover;
}

.bc-dock-item span {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.bc-hero {
  position: relative;
  padding: 42px 0 28px;
  overflow: hidden;
}

.bc-hero::before {
  content: "";
  position: absolute;
  inset: 8% -20% auto auto;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(232, 90, 113, 0.28), transparent 68%);
  animation: bc-float 7s ease-in-out infinite;
  pointer-events: none;
}

.bc-hero::after {
  content: "";
  position: absolute;
  inset: auto auto 0 -10%;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(47, 191, 174, 0.25), transparent 70%);
  animation: bc-float 9s ease-in-out infinite reverse;
  pointer-events: none;
}

@keyframes bc-float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-14px);
  }
}

.bc-hero-grid {
  display: grid;
  gap: 28px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.bc-kicker {
  display: inline-block;
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  color: var(--aqua);
  margin-bottom: 10px;
}

.bc-hero h1 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.7rem, 5.2vw, 2.6rem);
  line-height: 1.35;
  letter-spacing: 0.02em;
}

.bc-hero-lead {
  margin: 0;
  color: var(--ink-soft);
  font-size: 1.02rem;
  max-width: 34em;
}

.bc-hero-visual {
  position: relative;
  border-radius: 28px;
  overflow: hidden;
  box-shadow: var(--shadow);
  transform: rotate(-1.5deg);
  animation: bc-tilt 6s ease-in-out infinite;
}

@keyframes bc-tilt {
  0%,
  100% {
    transform: rotate(-1.5deg) translateY(0);
  }
  50% {
    transform: rotate(1deg) translateY(-8px);
  }
}

.bc-hero-visual img {
  width: 100%;
  aspect-ratio: 9 / 16;
  object-fit: cover;
  max-height: 520px;
}

.bc-hero-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 55%, rgba(21, 32, 43, 0.35));
  pointer-events: none;
}

.bc-crumb {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
  font-size: 0.88rem;
  color: var(--ink-soft);
  padding: 18px 0 6px;
}

.bc-crumb a {
  color: var(--ink-soft);
  text-decoration: none;
}

.bc-crumb a:hover {
  color: var(--rose);
}

.bc-crumb span {
  opacity: 0.45;
}

.bc-section {
  padding: 36px 0;
}

.bc-section h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 3.8vw, 1.85rem);
  line-height: 1.4;
}

.bc-section h3 {
  margin: 22px 0 10px;
  font-family: var(--font-display);
  font-size: 1.15rem;
  color: var(--ink);
}

.bc-section p {
  margin: 0 0 14px;
  color: var(--ink-soft);
}

.bc-prose p + p {
  text-indent: 0;
}

.bc-lane {
  display: grid;
  gap: 22px;
  align-items: center;
  margin: 28px 0;
}

.bc-lane-media {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  background: var(--cloud);
}

.bc-lane-media img {
  width: 100%;
  aspect-ratio: 9 / 16;
  object-fit: cover;
  max-height: 460px;
  margin-inline: auto;
}

.bc-glass-panel {
  background: var(--glass);
  border: 1px solid rgba(255, 255, 255, 0.65);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-radius: var(--radius);
  padding: 22px 20px;
  box-shadow: var(--shadow);
}

.bc-mosaic {
  display: grid;
  gap: 14px;
  margin: 22px 0;
}

.bc-tile {
  background: var(--cloud);
  border-radius: 18px;
  padding: 18px 16px;
  border: 1px solid var(--line);
  box-shadow: 0 10px 24px rgba(21, 32, 43, 0.05);
  transition: transform 0.22s ease, box-shadow 0.22s ease;
}

.bc-tile:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.bc-tile h3 {
  margin-top: 0;
}

.bc-tile-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  margin-bottom: 10px;
  background: linear-gradient(135deg, var(--blush), var(--aqua-soft));
  font-size: 1.2rem;
}

.bc-split-shot {
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr 1fr;
}

.bc-split-shot img {
  border-radius: 16px;
  width: 100%;
  aspect-ratio: 9 / 16;
  object-fit: cover;
  max-height: 340px;
  box-shadow: var(--shadow);
}

.bc-ribbon {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 18px 0;
}

.bc-chip {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(47, 191, 174, 0.12);
  color: #1f7a70;
  font-size: 0.88rem;
}

.bc-chip.is-rose {
  background: rgba(232, 90, 113, 0.12);
  color: var(--rose-deep);
}

.bc-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}

.bc-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 20px;
  border-radius: 14px;
  border: none;
  text-decoration: none;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

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

.bc-btn-primary {
  background: linear-gradient(135deg, var(--rose), #ff8a6b);
  color: #fff;
  box-shadow: 0 12px 24px rgba(232, 90, 113, 0.28);
}

.bc-btn-primary:hover {
  color: #fff;
}

.bc-btn-ghost {
  background: rgba(255, 255, 255, 0.7);
  color: var(--ink);
  border: 1px solid var(--line);
}

.bc-quote {
  margin: 24px 0;
  padding: 20px 18px;
  border-left: 4px solid var(--aqua);
  background: linear-gradient(90deg, rgba(47, 191, 174, 0.1), transparent);
  border-radius: 0 16px 16px 0;
  color: var(--ink);
  font-family: var(--font-display);
}

.bc-timeline {
  position: relative;
  margin: 24px 0;
  padding-left: 22px;
}

.bc-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background: linear-gradient(180deg, var(--rose), var(--aqua));
}

.bc-timeline article {
  position: relative;
  margin-bottom: 18px;
  padding: 14px 16px;
  background: rgba(255, 255, 255, 0.72);
  border-radius: 14px;
  border: 1px solid var(--line);
}

.bc-timeline article::before {
  content: "";
  position: absolute;
  left: -20px;
  top: 18px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--rose);
  box-shadow: 0 0 0 4px rgba(232, 90, 113, 0.18);
}

.bc-legal {
  padding-bottom: 60px;
}

.bc-legal h1 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  margin: 10px 0 16px;
}

.bc-legal h2 {
  margin-top: 28px;
}

.bc-error {
  min-height: 62vh;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 40px 0;
}

.bc-error-code {
  font-family: var(--font-brand);
  font-size: clamp(4rem, 18vw, 7rem);
  line-height: 1;
  background: linear-gradient(135deg, var(--rose), var(--aqua));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: bc-pulse 2.8s ease-in-out infinite;
}

@keyframes bc-pulse {
  0%,
  100% {
    filter: hue-rotate(0deg);
  }
  50% {
    filter: hue-rotate(18deg);
  }
}

.bc-footer {
  margin-top: 40px;
  padding: 34px 0 50px;
  border-top: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.45);
}

.bc-footer-grid {
  display: grid;
  gap: 22px;
}

.bc-footer h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 1.05rem;
}

.bc-footer a {
  display: inline-block;
  margin: 4px 10px 4px 0;
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 0.92rem;
}

.bc-footer a:hover {
  color: var(--rose);
}

.bc-copy {
  margin-top: 18px;
  font-size: 0.84rem;
  color: #7a8894;
}

.bc-fade-up {
  animation: bc-rise 0.7s ease both;
}

@keyframes bc-rise {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (min-width: 768px) {
  .bc-hero-grid {
    grid-template-columns: 1.15fr 0.85fr;
  }

  .bc-lane.is-flip,
  .bc-lane {
    grid-template-columns: 1fr 1.1fr;
  }

  .bc-lane.is-flip {
    direction: rtl;
  }

  .bc-lane.is-flip > * {
    direction: ltr;
  }

  .bc-mosaic {
    grid-template-columns: repeat(3, 1fr);
  }

  .bc-dock-grid {
    grid-template-columns: repeat(8, minmax(0, 1fr));
  }

  .bc-footer-grid {
    grid-template-columns: 1.4fr 1fr 1fr;
  }

  .bc-split-shot {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 980px) {
  .bc-hero-visual img,
  .bc-lane-media img {
    max-height: 560px;
  }
}