:root {
  --bg: #f4efe6;
  --surface: rgba(255, 255, 255, 0.72);
  --surface-strong: rgba(12, 23, 43, 0.9);
  --line: rgba(17, 36, 63, 0.12);
  --ink: #162236;
  --muted: #5e6b7d;
  --accent: #b36b2c;
  --accent-deep: #8a4a11;
  --accent-soft: rgba(179, 107, 44, 0.12);
  --shadow: 0 24px 60px rgba(23, 34, 49, 0.1);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --container: min(1140px, calc(100vw - 32px));
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at top right, rgba(179, 107, 44, 0.18), transparent 28%),
    radial-gradient(circle at 12% 18%, rgba(34, 63, 104, 0.16), transparent 24%),
    linear-gradient(180deg, #f7f3ec 0%, #f1ebdf 100%);
  font-family:
    "PingFang SC", "Noto Sans CJK SC", "Microsoft YaHei", "Helvetica Neue",
    sans-serif;
}

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

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

button {
  font: inherit;
}

.site-shell {
  min-height: 100vh;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  padding: 16px 0 0;
}

.header-inner {
  width: var(--container);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(248, 245, 238, 0.82);
  backdrop-filter: blur(18px);
  box-shadow: 0 12px 30px rgba(22, 34, 54, 0.06);
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.brand-mark {
  width: 44px;
  height: 44px;
  display: inline-grid;
  place-items: center;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-deep));
  color: #fff;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.brand-copy {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.brand-copy strong,
.hero h1,
.section-heading h2,
.case-headline h3 {
  font-family:
    "Songti SC", "STSong", "Noto Serif CJK SC", "Source Han Serif SC", serif;
}

.brand-copy strong {
  font-size: 0.95rem;
  line-height: 1.2;
}

.brand-copy small {
  color: var(--muted);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

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

.site-nav a,
.nav-toggle {
  border: 0;
  background: transparent;
  border-radius: 999px;
  padding: 10px 14px;
  color: var(--muted);
  transition:
    background-color 180ms ease,
    color 180ms ease,
    transform 180ms ease;
}

.site-nav a:hover,
.site-nav a:focus-visible,
.nav-toggle:hover,
.nav-toggle:focus-visible,
.button:hover,
.button:focus-visible {
  outline: none;
  color: var(--ink);
  background: rgba(22, 34, 54, 0.08);
  transform: translateY(-1px);
}

.nav-toggle {
  display: none;
  cursor: pointer;
}

main {
  width: var(--container);
  margin: 0 auto;
}

.section {
  scroll-margin-top: 108px;
}

.section {
  padding: 96px 0 0;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(320px, 0.8fr);
  gap: 28px;
  align-items: stretch;
  min-height: calc(100vh - 120px);
  padding-top: 42px;
}

.hero-copy,
.hero-panel,
.service-card,
.case-card,
.strength-card,
.domain-panel,
.media-slot,
.signal-card {
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.hero-copy,
.hero-panel,
.case-card {
  border-radius: var(--radius-xl);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.9), rgba(255, 255, 255, 0.78));
}

.hero-copy {
  padding: clamp(28px, 4vw, 56px);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.eyebrow {
  margin: 0 0 16px;
  color: var(--accent-deep);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2.3rem, 5vw, 4.8rem);
  line-height: 1.02;
  letter-spacing: -0.03em;
}

.hero-summary,
.section-heading p,
.about-copy p,
.signal-card p,
.service-card li,
.strength-card p,
.domain-panel li,
.case-details dd,
.media-fallback span,
.media-fallback code {
  color: var(--muted);
}

.hero-summary {
  max-width: 34rem;
  margin: 22px 0 0;
  font-size: 1.02rem;
  line-height: 1.9;
}

.hero-actions {
  display: flex;
  gap: 14px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 600;
}

.button-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-deep));
  box-shadow: 0 16px 34px rgba(179, 107, 44, 0.24);
}

.hero-panel {
  padding: 22px;
  display: grid;
  gap: 14px;
  background:
    linear-gradient(145deg, rgba(15, 29, 53, 0.96), rgba(22, 42, 76, 0.92)),
    linear-gradient(180deg, #0f2038, #162746);
}

.signal-card {
  padding: 18px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.06);
}

.signal-card span {
  display: inline-block;
  color: rgba(255, 255, 255, 0.55);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.signal-card strong {
  display: block;
  margin-top: 8px;
  color: #fff;
  font-size: 1.1rem;
}

.signal-card p {
  margin: 10px 0 0;
  color: rgba(255, 255, 255, 0.72);
  line-height: 1.7;
}

.section-heading {
  display: grid;
  gap: 10px;
  max-width: 720px;
  margin-bottom: 28px;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(1.9rem, 3vw, 3rem);
}

.section-heading p {
  margin: 0;
  line-height: 1.8;
}

.service-grid,
.strength-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.service-card,
.strength-card,
.domain-panel {
  padding: 22px;
  border-radius: var(--radius-lg);
  background: var(--surface);
  backdrop-filter: blur(10px);
}

.service-card h3,
.strength-card h3,
.domain-panel h3 {
  margin: 0 0 14px;
  font-size: 1.1rem;
}

.service-card ul,
.domain-panel ul,
.tag-list,
.case-details ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.service-card ul,
.domain-panel ul {
  display: grid;
  gap: 10px;
}

.service-card li,
.domain-panel li {
  padding-left: 18px;
  position: relative;
  line-height: 1.7;
}

.service-card li::before,
.domain-panel li::before,
.case-details li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
}

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

.case-card {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: 22px;
  padding: 22px;
}

.case-copy {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.case-kicker {
  margin: 0 0 8px;
  color: var(--accent-deep);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.case-headline h3 {
  margin: 0;
  font-size: clamp(1.65rem, 2.5vw, 2.4rem);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag-list li {
  padding: 8px 12px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-deep);
  font-size: 0.9rem;
  font-weight: 600;
}

.case-details {
  margin: 0;
  display: grid;
  gap: 18px;
}

.case-details dt {
  margin-bottom: 8px;
  font-weight: 700;
}

.case-details dd {
  margin: 0;
  line-height: 1.8;
}

.case-details ul {
  display: grid;
  gap: 8px;
}

.case-details li {
  position: relative;
  padding-left: 18px;
}

.case-media-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.media-slot {
  position: relative;
  overflow: hidden;
  min-height: 210px;
  padding: 18px;
  border-radius: var(--radius-lg);
  background:
    linear-gradient(160deg, rgba(255, 255, 255, 0.94), rgba(241, 233, 222, 0.78));
}

.media-slot-large {
  grid-column: 1 / -1;
  min-height: 280px;
}

.media-slot img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: calc(var(--radius-lg) - 6px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 180ms ease;
}

.media-slot.has-image {
  padding: 0;
  background: #d7dfeb;
}

.media-slot.has-image img {
  opacity: 1;
  visibility: visible;
}

.media-slot.has-image .media-fallback {
  display: none;
}

.media-fallback {
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 10px;
}

.media-fallback strong {
  font-size: 1.05rem;
}

.media-fallback span,
.media-fallback code {
  line-height: 1.7;
}

.media-fallback code {
  font-size: 0.8rem;
  word-break: break-all;
}

.about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
  gap: 20px;
}

.about-copy {
  padding: 28px;
  border-radius: var(--radius-xl);
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--line);
}

.about-copy p {
  margin: 0;
  line-height: 1.95;
}

.about-copy p + p {
  margin-top: 16px;
}

@media (max-width: 980px) {
  .hero,
  .case-card,
  .about-layout,
  .service-grid,
  .strength-grid {
    grid-template-columns: 1fr;
  }

  .site-nav {
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    left: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 24px;
    background: rgba(248, 245, 238, 0.96);
    box-shadow: 0 16px 40px rgba(22, 34, 54, 0.08);
  }

  .site-nav.is-open {
    display: flex;
  }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .header-inner {
    position: relative;
    border-radius: 28px;
  }

}

@media (max-width: 720px) {
  .site-header {
    padding-top: 10px;
  }

  .header-inner,
  main {
    width: min(100vw - 20px, 1140px);
  }

  .hero {
    min-height: auto;
    padding-top: 24px;
  }

  .hero-copy,
  .hero-panel,
  .case-card,
  .about-copy {
    padding: 20px;
  }

  .case-media-grid {
    grid-template-columns: 1fr;
  }

  .media-slot-large {
    min-height: 220px;
  }
}