:root {
  --bg: #ffffff;
  --bg-soft: #f5f6f8;
  --bg-featured: #eef0f5;
  --ink: #111111;
  --muted: #6b7280;
  --line: #e5e7eb;
  --purple: #6d4aff;
  --purple-deep: #5a3ae6;
  --purple-soft: #efeaff;
  --purple-text: #5b3fd4;
  --radius: 16px;
  --radius-pill: 999px;
  --serif: "Songti SC", "STSong", "Noto Serif SC", "Source Han Serif SC", Georgia, serif;
  --sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", -apple-system, BlinkMacSystemFont, sans-serif;
  --shadow: 0 8px 28px rgba(17, 17, 17, 0.08);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

button {
  font: inherit;
}

/* —— Nav —— */
.nav {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem clamp(1rem, 3vw, 2.5rem);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 1.7rem;
  height: 1.7rem;
  border-radius: 0.45rem;
  background: var(--purple);
  color: #fff;
  font-size: 0.78rem;
  font-weight: 700;
}

.brand-mark.sm {
  width: 1.35rem;
  height: 1.35rem;
  font-size: 0.65rem;
}

.brand-name {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.nav-links {
  display: none;
  gap: 1.5rem;
  color: #374151;
  font-size: 0.92rem;
  font-weight: 500;
}

.nav-links a:hover {
  color: var(--purple);
}

.nav-cta {
  padding: 0.5rem 1rem;
  border-radius: var(--radius-pill);
  background: var(--purple);
  color: #fff;
  font-size: 0.88rem;
  font-weight: 600;
  transition: background 0.2s var(--ease);
}

.nav-cta:hover {
  background: var(--purple-deep);
}

@media (min-width: 860px) {
  .nav-links {
    display: flex;
  }
}

/* —— Hero —— */
.hero {
  max-width: 920px;
  margin: 0 auto;
  padding: clamp(2.5rem, 6vw, 4.5rem) clamp(1rem, 3vw, 2rem) 1.5rem;
  text-align: center;
}

.trust-pill {
  display: inline-flex;
  align-items: center;
  margin: 0 0 1.25rem;
  padding: 0.4rem 0.95rem;
  border-radius: var(--radius-pill);
  background: var(--bg-soft);
  color: var(--muted);
  font-size: 0.82rem;
}

.hero h1 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(2rem, 5.2vw, 3.35rem);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: #0f0f10;
}

.hero-sub {
  margin: 1rem auto 0;
  max-width: 34rem;
  color: var(--muted);
  font-size: 1.02rem;
}

.pill-tabs {
  display: inline-flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.45rem;
  margin-top: 1.75rem;
  padding: 0.35rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: #fff;
}

.pill-tab {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--ink);
  padding: 0.55rem 1.05rem;
  border-radius: var(--radius-pill);
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  transition: background 0.2s, color 0.2s;
}

.pill-tab.is-active {
  background: #4b5563;
  color: #fff;
}

/* —— Services carousel —— */
.services {
  padding: 0.5rem 0 2.5rem;
}

.section-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0 clamp(1rem, 3vw, 2.5rem) 1rem;
}

.section-title {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.55rem, 3vw, 2rem);
  font-weight: 700;
}

.section-title.center {
  text-align: center;
}

.carousel-nav {
  display: flex;
  gap: 0.5rem;
}

.carousel-btn {
  width: 2.4rem;
  height: 2.4rem;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  font-size: 1.25rem;
  line-height: 1;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}

.carousel-btn:hover {
  border-color: #c4c8d0;
  background: var(--bg-soft);
}

.service-track {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(240px, 280px);
  gap: 1rem;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding: 0.25rem clamp(1rem, 3vw, 2.5rem) 1rem;
  scrollbar-width: none;
}

.service-track::-webkit-scrollbar {
  display: none;
}

.service-card {
  scroll-snap-align: start;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  overflow: hidden;
  transition: box-shadow 0.25s var(--ease), transform 0.25s var(--ease);
}

.service-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.service-card.is-hidden {
  display: none;
}

.service-media {
  aspect-ratio: 4 / 3;
  background: linear-gradient(180deg, #f3f4f6, #fff);
  overflow: hidden;
}

.service-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.service-body {
  padding: 0.95rem 1rem 1.15rem;
}

.service-body h3 {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 700;
}

.service-body p {
  margin: 0.45rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.55;
}

/* —— Featured case —— */
.featured {
  margin: 1rem clamp(1rem, 3vw, 2.5rem) 0;
  padding: clamp(2rem, 5vw, 3.25rem);
  border-radius: 24px;
  background:
    linear-gradient(90deg, rgba(109, 74, 255, 0.03) 1px, transparent 1px) 0 0 / 48px 48px,
    linear-gradient(rgba(109, 74, 255, 0.03) 1px, transparent 1px) 0 0 / 48px 48px,
    var(--bg-featured);
}

.featured-inner {
  display: grid;
  gap: 1.75rem;
  align-items: center;
  max-width: 1180px;
  margin: 0 auto;
}

@media (min-width: 900px) {
  .featured-inner {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 2.5rem;
  }
}

.featured-copy h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.55rem, 3.2vw, 2.35rem);
  font-weight: 700;
  line-height: 1.3;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 1rem 0;
}

.tag {
  padding: 0.28rem 0.7rem;
  border-radius: var(--radius-pill);
  background: var(--purple-soft);
  color: var(--purple-text);
  font-size: 0.78rem;
  font-weight: 600;
}

.featured-copy p {
  margin: 0 0 1.35rem;
  color: var(--muted);
  max-width: 34rem;
}

.btn-purple {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.9rem;
  padding: 0.7rem 1.35rem;
  border-radius: var(--radius-pill);
  background: var(--purple);
  color: #fff;
  font-weight: 600;
  font-size: 0.95rem;
  transition: background 0.2s var(--ease), transform 0.2s var(--ease);
}

.btn-purple:hover {
  background: var(--purple-deep);
  transform: translateY(-1px);
}

.featured-visual {
  overflow: hidden;
  border-radius: 18px;
  background: #fff;
  box-shadow: var(--shadow);
  aspect-ratio: 4 / 3;
}

.featured-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* —— Results —— */
.results {
  padding: clamp(3rem, 7vw, 4.5rem) clamp(1rem, 3vw, 2.5rem) 1rem;
}

.results-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  max-width: 980px;
  margin: 1.75rem auto 0;
}

@media (min-width: 780px) {
  .results-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.result-card {
  padding: 1.35rem 1.25rem 1.5rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  text-align: center;
}

.result-num {
  margin: 0 0 0.55rem;
  color: var(--purple);
  font-family: var(--serif);
  font-size: 1.55rem;
  font-weight: 700;
}

.result-card h3 {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 700;
}

.result-card p:last-child {
  margin: 0.5rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

/* —— Hot features —— */
.hot {
  padding: clamp(3rem, 7vw, 5rem) clamp(1rem, 3vw, 2.5rem) 1rem;
}

.hot-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  max-width: 1180px;
  margin: 1.5rem auto 0;
}

@media (min-width: 640px) {
  .hot-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 980px) {
  .hot-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.hot-card {
  display: grid;
  grid-template-rows: auto 1fr;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: #fff;
  transition: box-shadow 0.25s var(--ease);
}

.hot-card:hover {
  box-shadow: var(--shadow);
}

.hot-card img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.hot-card > div {
  padding: 0.95rem 1rem 1.15rem;
}

.hot-card h3 {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 700;
}

.hot-card p {
  margin: 0.4rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

/* —— Cases wall —— */
.cases-wall {
  padding: clamp(2.5rem, 6vw, 4rem) clamp(1rem, 3vw, 2.5rem);
}

.section-desc {
  margin: 0.75rem auto 0;
  text-align: center;
  color: var(--muted);
  max-width: 36rem;
}

.case-filters {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.45rem;
  margin: 1.5rem 0 1.25rem;
}

.filter {
  appearance: none;
  border: 1px solid var(--line);
  background: #fff;
  color: #374151;
  padding: 0.45rem 0.95rem;
  border-radius: var(--radius-pill);
  cursor: pointer;
  font-size: 0.88rem;
  font-weight: 500;
}

.filter.is-active {
  background: var(--purple);
  border-color: var(--purple);
  color: #fff;
}

.case-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.85rem;
  max-width: 1180px;
  margin: 0 auto;
}

@media (min-width: 640px) {
  .case-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 980px) {
  .case-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.case-item {
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: #fff;
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.55s var(--ease), transform 0.55s var(--ease);
}

.case-item.is-visible {
  opacity: 1;
  transform: none;
}

.case-item.is-hidden {
  display: none;
}

.case-item img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  transition: transform 0.7s var(--ease);
}

.case-item:hover img {
  transform: scale(1.04);
}

.case-item figcaption {
  padding: 0.75rem 0.9rem 0.95rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: #1f2937;
}

/* —— CTA —— */
.cta {
  max-width: 720px;
  margin: 0 auto;
  padding: clamp(2.5rem, 6vw, 4rem) clamp(1rem, 3vw, 2rem) clamp(3rem, 7vw, 5rem);
  text-align: center;
}

.cta h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.6rem, 3.5vw, 2.3rem);
  font-weight: 700;
}

.cta p {
  margin: 0.85rem auto 1.5rem;
  color: var(--muted);
}

/* —— Footer —— */
.footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 1.35rem clamp(1rem, 3vw, 2.5rem) 2rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.88rem;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--ink);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .case-item,
  .service-card,
  .hot-card {
    transition: none;
  }

  .case-item {
    opacity: 1;
    transform: none;
  }
}

/* —— Legal / Beian footer —— */
.footer {
  display: block;
  padding: 1.75rem clamp(1rem, 3vw, 2.5rem) 2.25rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.86rem;
  background: #fafafa;
}

.footer-top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-links a:hover {
  color: var(--purple);
}

.footer-legal {
  display: grid;
  gap: 0.35rem;
  line-height: 1.7;
}

.footer-legal a {
  color: #4b5563;
}

.footer-legal a:hover {
  color: var(--purple);
}

.beian-placeholder {
  color: #9ca3af;
}

.police-link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.legal-page {
  max-width: 760px;
  margin: 0 auto;
  padding: 6.5rem clamp(1rem, 3vw, 2rem) 3rem;
}

.legal-page h1 {
  margin: 0 0 1rem;
  font-family: var(--serif);
  font-size: clamp(1.8rem, 4vw, 2.4rem);
}

.legal-page h2 {
  margin: 1.75rem 0 0.6rem;
  font-size: 1.15rem;
}

.legal-page p,
.legal-page li {
  color: #4b5563;
  line-height: 1.8;
}

.legal-meta {
  margin: 0 0 1.5rem;
  color: var(--muted);
  font-size: 0.9rem;
}