:root {
  color-scheme: dark;
  --ink: #f4f1e8;
  --ink-soft: #cbd0d2;
  --muted: #92999d;
  --line: rgba(255, 255, 255, 0.12);
  --paper: #0e1114;
  --surface: #15191d;
  --surface-raised: #191e23;
  --soft: #121519;
  --charcoal: #0e1114;
  --charcoal-soft: #171b20;
  --graphite: #24282d;
  --metal: #dfe2dc;
  --gold: #c6a160;
  --gold-strong: #d8b16b;
  --teal: #83bebb;
  --teal-soft: rgba(79, 142, 143, 0.22);
  --shadow: 0 28px 70px rgba(0, 0, 0, 0.28);
  --shadow-soft: 0 14px 34px rgba(0, 0, 0, 0.18);
  --radius: 8px;
  --container: 1160px;
  --header-bg: rgba(16, 18, 21, 0.94);
  --menu-bg: #14171b;
  --section-bg: #0e1114;
  --section-alt: #101418;
  --section-border: rgba(255, 255, 255, 0.08);
  --panel-bg: rgba(255, 255, 255, 0.055);
  --panel-bg-strong: #15191d;
  --table-bg: rgba(255, 255, 255, 0.055);
  --table-label-bg: rgba(255, 255, 255, 0.05);
  --step-bg: rgba(255, 255, 255, 0.035);
  --card-bg: #15191d;
  --card-body-bg: linear-gradient(180deg, #191d22 0%, #14181c 100%);
  --card-copy: rgba(255, 255, 255, 0.74);
  --media-bg: #080a0c;
  --chip-bg: rgba(79, 142, 143, 0.2);
  --chip-fg: #bddbd8;
  --inner-hero-bg: linear-gradient(90deg, #0e1114 0%, #171b20 56%, #22272c 100%);
  --inner-hero-ink: #ffffff;
  --inner-hero-copy: rgba(255, 255, 255, 0.76);
  --contact-band-bg: linear-gradient(90deg, #0e1114 0%, #171b20 64%, #0e1114 100%);
  --contact-band-ink: #ffffff;
  --contact-band-copy: rgba(255, 255, 255, 0.76);
}

:root[data-theme="light"] {
  color-scheme: light;
  --ink: #111214;
  --ink-soft: #3c4244;
  --muted: #6f7478;
  --line: #d7dad3;
  --paper: #eef0ec;
  --surface: #f6f7f2;
  --surface-raised: #ffffff;
  --soft: #e7eae5;
  --charcoal: #101215;
  --charcoal-soft: #181b20;
  --graphite: #24282d;
  --gold-strong: #8f672e;
  --teal: #2d6768;
  --teal-soft: #e1ecea;
  --shadow: 0 24px 70px rgba(15, 17, 20, 0.1);
  --shadow-soft: 0 12px 32px rgba(15, 17, 20, 0.06);
  --section-bg: #eef0ec;
  --section-alt: #e7eae5;
  --section-border: rgba(17, 18, 20, 0.08);
  --panel-bg: rgba(255, 255, 255, 0.7);
  --panel-bg-strong: #f8f8f3;
  --table-bg: rgba(255, 255, 255, 0.7);
  --table-label-bg: rgba(17, 18, 20, 0.035);
  --step-bg: rgba(255, 255, 255, 0.36);
  --card-bg: #f8f8f3;
  --card-body-bg: #f8f8f3;
  --card-copy: #4d5356;
  --chip-bg: #dce9e7;
  --chip-fg: #2d6768;
  --inner-hero-bg: linear-gradient(90deg, #e7eae5 0%, #f1f2ed 100%);
  --inner-hero-ink: #111214;
  --inner-hero-copy: #4c5254;
  --contact-band-bg: linear-gradient(90deg, #e7eae5 0%, #eef0ec 100%);
  --contact-band-ink: #111214;
  --contact-band-copy: #4c5254;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--section-bg);
  font-family:
    "Noto Sans SC",
    "Microsoft YaHei",
    "PingFang SC",
    "Hiragino Sans GB",
    Arial,
    sans-serif;
  font-size: 16px;
  line-height: 1.72;
  letter-spacing: 0;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

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

a:hover {
  color: var(--gold-strong);
}

p,
h1,
h2,
h3 {
  margin-top: 0;
}

p {
  color: var(--ink-soft);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.container {
  width: min(var(--container), calc(100% - 40px));
  margin: 0 auto;
}

.narrow {
  width: min(850px, calc(100% - 40px));
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  color: #fff;
  background: var(--header-bg);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  backdrop-filter: saturate(120%) blur(18px);
}

.header-inner {
  width: min(1280px, calc(100% - 32px));
  min-height: 74px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 20px;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  color: #fff;
}

.brand-mark {
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  color: #f4d28b;
  background: rgba(198, 161, 96, 0.12);
  border: 1px solid rgba(198, 161, 96, 0.72);
  border-radius: 6px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
  font-size: 1.15rem;
  font-weight: 900;
}

.brand-copy {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.brand-copy strong {
  color: #fff;
  font-size: 1rem;
  font-weight: 900;
}

.brand-copy span {
  color: rgba(255, 255, 255, 0.62);
  font-size: 0.82rem;
}

.site-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-item {
  position: relative;
}

.nav-link,
.header-phone {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  padding: 0 12px;
  border-radius: 6px;
  color: rgba(255, 255, 255, 0.78);
  font-size: 0.94rem;
  white-space: nowrap;
  transition:
    background-color 160ms ease,
    color 160ms ease,
    border-color 160ms ease,
    transform 160ms ease;
}

.nav-link.is-active,
.nav-link:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  box-shadow: inset 0 -2px 0 var(--gold);
}

.subnav {
  position: absolute;
  left: 0;
  top: calc(100% + 10px);
  min-width: 220px;
  padding: 8px;
  background: var(--menu-bg);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.34);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition:
    opacity 160ms ease,
    transform 160ms ease,
    visibility 160ms ease;
}

.nav-item:hover .subnav,
.nav-item:focus-within .subnav {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.subnav a {
  display: block;
  padding: 10px 12px;
  border-radius: 6px;
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.92rem;
}

.subnav a:hover,
.subnav a.is-active {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
}

.header-phone {
  color: #fff;
  border: 1px solid rgba(198, 161, 96, 0.72);
  background: rgba(198, 161, 96, 0.08);
  font-weight: 700;
}

.header-phone:hover {
  color: #111;
  background: var(--gold);
  border-color: var(--gold);
  transform: translateY(-1px);
}

.theme-toggle {
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0 10px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 6px;
  color: rgba(255, 255, 255, 0.76);
  background: rgba(255, 255, 255, 0.055);
  font: inherit;
  font-size: 0.86rem;
  font-weight: 800;
  cursor: pointer;
  transition:
    background-color 160ms ease,
    border-color 160ms ease,
    color 160ms ease;
}

.theme-toggle:hover {
  color: #fff;
  background: rgba(198, 161, 96, 0.12);
  border-color: rgba(198, 161, 96, 0.56);
}

.theme-toggle-track {
  position: relative;
  width: 34px;
  height: 20px;
  flex: 0 0 auto;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.18);
}

.theme-toggle-thumb {
  position: absolute;
  left: 3px;
  top: 3px;
  width: 12px;
  height: 12px;
  border-radius: 999px;
  background: var(--gold);
  transition: transform 160ms ease;
}

:root[data-theme="light"] .theme-toggle-thumb {
  transform: translateX(14px);
  background: #fff;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 6px;
  background: transparent;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
}

.nav-toggle span:not(.sr-only) {
  width: 19px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
}

.hero {
  position: relative;
  min-height: 640px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background:
    linear-gradient(90deg, rgba(7, 8, 10, 0.86) 0%, rgba(12, 14, 16, 0.68) 36%, rgba(12, 14, 16, 0.22) 66%, rgba(12, 14, 16, 0.08)),
    var(--hero-image) center / cover no-repeat;
  color: #fff;
  isolation: isolate;
}

.hero::before,
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero::before {
  z-index: 0;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.05), transparent 34%, rgba(0, 0, 0, 0.35)),
    linear-gradient(90deg, rgba(198, 161, 96, 0.15), transparent 27%);
}

.hero::after {
  z-index: 1;
  background: linear-gradient(180deg, transparent 0, transparent 58%, rgba(0, 0, 0, 0.24) 100%);
  mix-blend-mode: multiply;
}

.hero-shade {
  position: absolute;
  inset: auto 0 0;
  z-index: 1;
  height: 190px;
  background: linear-gradient(0deg, rgba(0, 0, 0, 0.5), transparent);
}

.hero-content {
  position: relative;
  z-index: 2;
  width: min(980px, calc(100% - 56px));
  margin-left: max(28px, calc((100vw - var(--container)) / 2));
  padding: 48px 0 86px;
}

.hero-content::before {
  content: "";
  display: block;
  width: 76px;
  height: 2px;
  margin-bottom: 22px;
  background: var(--gold);
}

.eyebrow {
  margin-bottom: 12px;
  color: var(--gold);
  font-weight: 800;
  font-size: 0.86rem;
}

.hero h1 {
  margin-bottom: 20px;
  color: #fff;
  font-size: 4.2rem;
  line-height: 1.05;
  font-weight: 900;
}

.hero-subtitle {
  max-width: 720px;
  color: rgba(255, 255, 255, 0.9);
  font-size: 1.08rem;
  line-height: 1.92;
}

.hero-actions,
.center-actions,
.contact-actions,
.contact-band-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.hero-actions {
  margin-top: 28px;
}

.btn {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 0 20px;
  border-radius: 6px;
  border: 1px solid transparent;
  font-weight: 800;
  line-height: 1.2;
  transition:
    background-color 160ms ease,
    border-color 160ms ease,
    color 160ms ease,
    transform 160ms ease,
    box-shadow 160ms ease;
}

.btn-primary {
  background: var(--gold);
  color: #111;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.22);
}

.btn-primary:hover {
  background: #f1cf8c;
  color: #111;
  transform: translateY(-1px);
}

.btn-light {
  background: rgba(255, 255, 255, 0.07);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.32);
}

.btn-light:hover {
  background: #fff;
  color: #111;
  transform: translateY(-1px);
}

.contact-column .btn-light,
.center-actions .btn-light,
.inline-cta .btn-light,
.contact-band .btn-light {
  color: var(--ink);
  background: transparent;
  border-color: var(--line);
}

.contact-column .btn-light:hover,
.center-actions .btn-light:hover,
.inline-cta .btn-light:hover,
.contact-band .btn-light:hover {
  color: #fff;
  background: var(--charcoal);
  border-color: var(--charcoal);
}

.text-link {
  display: inline-flex;
  color: var(--teal);
  font-weight: 800;
  border-bottom: 2px solid currentColor;
}

.text-link:hover {
  color: var(--gold-strong);
}

.signal-strip {
  width: min(1120px, calc(100% - 40px));
  margin: -44px auto -22px;
  position: relative;
  z-index: 3;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  color: #fff;
  background: rgba(18, 21, 24, 0.96);
  border: 1px solid rgba(255, 255, 255, 0.11);
  border-radius: var(--radius);
  box-shadow: 0 28px 80px rgba(0, 0, 0, 0.22);
  backdrop-filter: blur(12px);
}

.signal-strip div {
  padding: 26px 28px;
  border-right: 1px solid rgba(255, 255, 255, 0.1);
}

.signal-strip div:last-child {
  border-right: 0;
}

.signal-strip strong {
  display: block;
  font-size: 1.25rem;
  color: #f7f4ea;
}

.signal-strip span {
  color: rgba(255, 255, 255, 0.62);
}

.section {
  padding: 96px 0;
  background: var(--section-bg);
}

.signal-strip + .section {
  padding-top: 78px;
}

.section-muted {
  color: var(--ink);
  background: var(--section-alt);
  border-top: 1px solid var(--section-border);
  border-bottom: 1px solid var(--section-border);
}

.section-muted p {
  color: var(--ink-soft);
}

.section-muted .section-header h2,
.section-muted .section-header p:last-child {
  color: var(--ink);
}

.section-muted .text-link {
  color: var(--teal);
}

.section-dark {
  background: var(--section-bg);
  color: var(--ink);
  border-top: 1px solid var(--section-border);
  border-bottom: 1px solid var(--section-border);
}

.section-dark p {
  color: var(--ink-soft);
}

.service-showcase {
  padding-top: 72px;
  padding-bottom: 84px;
  color: var(--ink);
  background: var(--section-bg);
  border-top: 1px solid var(--section-border);
  border-bottom: 1px solid var(--section-border);
}

.service-showcase .section-header h2,
.service-showcase .section-header p:last-child {
  color: var(--ink);
}

.service-showcase .service-grid {
  margin-top: 4px;
}

.section-header {
  max-width: 820px;
  margin-bottom: 40px;
}

.section-header h2,
.inner-hero h1,
.content-block h2,
.rich-text h2,
.contact-band h2 {
  margin-bottom: 14px;
  font-size: 2.15rem;
  line-height: 1.2;
}

.section-header p:last-child,
.inner-hero p {
  max-width: 760px;
  color: var(--muted);
}

.section-dark .section-header p:last-child,
.section-dark .section-header h2 {
  color: var(--ink);
}

.service-grid,
.case-grid,
.article-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.service-card,
.case-card,
.article-card {
  overflow: hidden;
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: none;
  transition:
    border-color 180ms ease,
    box-shadow 180ms ease,
    transform 180ms ease;
}

.service-card:hover,
.case-card:hover,
.article-card:hover {
  border-color: rgba(198, 161, 96, 0.52);
  box-shadow: var(--shadow-soft);
  transform: translateY(-2px);
}

.service-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.service-card {
  display: grid;
  grid-template-columns: 1fr;
  min-height: 0;
}

.card-image-link {
  position: relative;
  display: block;
  min-height: 0;
  overflow: hidden;
  background: var(--media-bg);
  border-bottom: 1px solid var(--line);
}

.card-image-link::after {
  display: none;
}

.service-card img,
.case-card img,
.article-card img {
  width: 100%;
  height: auto;
  aspect-ratio: 34 / 25;
  object-fit: contain;
  background: var(--media-bg);
}

.service-card img {
  aspect-ratio: 34 / 25;
}

.case-card img,
.article-card img {
  aspect-ratio: 34 / 25;
}

.card-body {
  padding: 28px;
}

.service-card .card-body,
.case-card .card-body,
.article-card .card-body {
  color: var(--ink);
  background: var(--card-body-bg);
}

.card-kicker,
.link-row span,
.article-row span {
  margin-bottom: 10px;
  color: var(--gold);
  font-size: 0.86rem;
  font-weight: 900;
}

.card-body h3,
.link-row h3,
.article-row h3,
.proof-grid h3,
.step-row h3,
.side-feature h2,
.contact-column h2 {
  margin-bottom: 10px;
  font-size: 1.15rem;
  line-height: 1.35;
}

.service-card .card-body h3 {
  font-size: 1.38rem;
}

.card-body p {
  margin-bottom: 0;
  font-size: 0.96rem;
}

.service-card .card-body p,
.case-card .card-body p,
.article-card .card-body p {
  color: var(--card-copy);
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.chip-row span {
  display: inline-flex;
  min-height: 30px;
  align-items: center;
  padding: 0 10px;
  border-radius: 4px;
  background: var(--chip-bg);
  color: var(--chip-fg);
  border: 1px solid rgba(189, 219, 216, 0.16);
  font-size: 0.82rem;
  font-weight: 800;
}

.two-column {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: 48px;
  align-items: center;
}

.align-start {
  align-items: start;
}

.proof-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.proof-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.proof-list div {
  display: grid;
  grid-template-columns: minmax(150px, 0.45fr) minmax(0, 1fr);
  gap: 24px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.proof-list strong,
.inspection-list strong,
.feature-list li::marker {
  color: var(--gold-strong);
}

.proof-list span {
  color: var(--ink-soft);
}

.section-muted .proof-list span {
  color: var(--ink-soft);
}

.inline-cta {
  margin-top: 42px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.section-muted .inline-cta {
  color: var(--ink);
  border-color: var(--line);
}

.section-muted .inline-cta p {
  color: var(--ink-soft);
}

.link-row {
  padding: 2px 0 18px;
  border-bottom: 1px solid var(--line);
}

.link-row p,
.article-row p {
  margin: 0;
  color: var(--ink-soft);
}

.link-row h3,
.article-row h3 {
  margin-bottom: 6px;
}

.link-row:hover h3,
.article-row:hover h3 {
  color: var(--gold-strong);
}

.feature-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0 34px;
  margin: 0;
  padding: 0;
  list-style-position: inside;
  border-top: 1px solid var(--line);
}

.feature-list li {
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  font-weight: 800;
}

.inspection-list {
  display: grid;
  grid-template-columns: 1fr;
  border-top: 1px solid var(--line);
}

.inspection-list div {
  display: grid;
  grid-template-columns: minmax(180px, 0.28fr) minmax(0, 1fr);
  gap: 28px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.inspection-list p {
  margin: 0;
  color: var(--ink-soft);
}

.article-list {
  display: grid;
  border-top: 1px solid var(--line);
}

.article-row {
  display: grid;
  grid-template-columns: 130px minmax(220px, 0.45fr) minmax(0, 1fr);
  gap: 24px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
  align-items: start;
}

.step-row {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
  background: var(--step-bg);
}

.step-row article {
  min-height: 210px;
  padding: 28px 26px;
  background: transparent;
  border: 0;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  box-shadow: none;
}

.step-row article span {
  display: inline-block;
  margin-bottom: 12px;
  color: var(--gold-strong);
  font-size: 0.9rem;
  font-weight: 900;
}

.step-row p {
  margin-bottom: 0;
  font-size: 0.92rem;
}

.split-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.split-list > div {
  display: grid;
  gap: 14px;
}

.inner-hero {
  padding: 98px 0 76px;
  background: var(--inner-hero-bg);
  color: var(--inner-hero-ink);
  border-bottom: 1px solid var(--section-border);
}

.inner-hero h1 {
  max-width: 900px;
  color: var(--inner-hero-ink);
}

.inner-hero p {
  color: var(--inner-hero-copy);
}

.rich-text {
  font-size: 1.02rem;
}

.rich-text h2,
.content-block h2 {
  font-size: 1.55rem;
}

.content-block {
  margin-bottom: 34px;
}

.lead {
  font-size: 1.12rem;
  color: var(--ink);
}

.check-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  position: relative;
  padding: 10px 0 10px 28px;
  border-bottom: 1px solid var(--line);
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  width: 8px;
  height: 8px;
  border: 2px solid var(--gold);
  border-radius: 4px;
}

.info-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--table-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: none;
}

.info-table th,
.info-table td {
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.info-table th {
  width: 210px;
  background: var(--table-label-bg);
  color: var(--ink);
}

.section-muted .info-table {
  background: var(--table-bg);
  border-color: var(--line);
}

.section-muted .info-table th,
.section-muted .info-table td {
  border-bottom-color: var(--line);
}

.section-muted .info-table th {
  color: var(--ink);
  background: var(--table-label-bg);
}

.section-muted .info-table td {
  color: var(--ink);
}

.info-table tr:last-child th,
.info-table tr:last-child td {
  border-bottom: 0;
}

.side-image,
.side-feature img {
  width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  object-fit: contain;
  background: var(--media-bg);
  box-shadow: var(--shadow-soft);
}

.side-feature {
  position: sticky;
  top: 100px;
  padding-left: 10px;
}

.side-feature img {
  margin-bottom: 20px;
  aspect-ratio: 34 / 25;
  box-shadow: none;
}

.side-feature p {
  color: var(--ink-soft);
}

.side-link {
  display: block;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
  font-weight: 800;
}

.faq-list {
  display: grid;
  gap: 12px;
}

details {
  background: var(--panel-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
  transition:
    border-color 160ms ease,
    box-shadow 160ms ease;
}

details[open] {
  border-color: rgba(198, 161, 96, 0.55);
  box-shadow: var(--shadow-soft);
}

.section-muted details {
  color: var(--ink);
  background: var(--panel-bg);
  border-color: var(--line);
  box-shadow: none;
}

.section-muted details p {
  color: var(--ink-soft);
}

summary {
  cursor: pointer;
  padding: 18px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  font-weight: 900;
  list-style: none;
}

summary::after {
  content: "+";
  flex: 0 0 auto;
  color: var(--gold-strong);
  font-size: 1.2rem;
  line-height: 1;
}

details[open] summary::after {
  content: "-";
}

summary::-webkit-details-marker {
  display: none;
}

details p {
  margin: 0;
  padding: 0 22px 22px;
}

.contact-band {
  padding: 54px 0;
  background: var(--contact-band-bg);
  color: var(--contact-band-ink);
  border-top: 1px solid var(--section-border);
}

.contact-band p {
  color: var(--contact-band-copy);
}

.contact-band-inner,
.contact-layout {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 36px;
  align-items: center;
}

.contact-band-actions {
  justify-content: flex-end;
}

.contact-layout {
  align-items: stretch;
}

.contact-column {
  padding: 0;
}

.contact-column .info-table {
  margin-bottom: 22px;
}

.wechat-image {
  width: 152px;
  margin-top: 20px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

.footer-main {
  width: min(var(--container), calc(100% - 40px));
  margin: 0 auto;
  padding: 62px 0 38px;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr 1fr;
  gap: 42px;
}

.site-footer {
  color: #fff;
  background: #0f1114;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.site-footer h2 {
  margin-bottom: 14px;
  font-size: 1rem;
  color: #fff;
}

.site-footer a {
  display: block;
  margin-bottom: 8px;
  color: rgba(255, 255, 255, 0.68);
}

.site-footer a:hover {
  color: var(--gold);
}

.site-footer p {
  color: rgba(255, 255, 255, 0.66);
}

.footer-mark {
  margin-bottom: 16px;
}

.footer-bottom {
  width: min(var(--container), calc(100% - 40px));
  margin: 0 auto;
  padding: 18px 0 28px;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.92rem;
}

@media (max-width: 1100px) {
  .header-inner {
    min-height: 70px;
  }

  .theme-toggle {
    margin-left: auto;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 78px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 14px;
    background: var(--menu-bg);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--radius);
    box-shadow: 0 24px 70px rgba(0, 0, 0, 0.35);
  }

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

  .nav-link {
    width: 100%;
  }

  .subnav {
    position: static;
    display: grid;
    margin: 0 0 8px 12px;
    box-shadow: none;
    opacity: 1;
    visibility: visible;
    transform: none;
    border: 0;
    padding: 0;
  }

  .header-phone {
    display: none;
  }

  .service-grid,
  .case-grid,
  .article-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .step-row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 980px) {
  .service-grid {
    grid-template-columns: 1fr;
  }

  .service-card {
    min-height: auto;
  }

  .service-card .card-image-link {
    min-height: 0;
  }
}

@media (max-width: 780px) {
  .container,
  .narrow {
    width: min(100% - 28px, var(--container));
  }

  .brand-mark {
    width: 42px;
    height: 42px;
  }

  .brand-copy span {
    display: none;
  }

  .hero {
    min-height: 620px;
    background:
      linear-gradient(90deg, rgba(7, 8, 10, 0.88), rgba(12, 14, 16, 0.54)),
      var(--hero-image) 58% center / cover no-repeat;
  }

  .hero-content {
    width: calc(100% - 36px);
    margin: 0 auto;
    padding: 52px 0 72px;
  }

  .hero h1 {
    font-size: 3.05rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .signal-strip,
  .service-grid,
  .case-grid,
  .article-grid,
  .two-column,
  .proof-grid,
  .proof-list div,
  .inspection-list div,
  .article-row,
  .split-list,
  .contact-band-inner,
  .contact-layout,
  .footer-main {
    grid-template-columns: 1fr;
  }

  .signal-strip {
    margin-top: 0;
    border-radius: 0;
    width: 100%;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .signal-strip div {
    border-right: 1px solid rgba(255, 255, 255, 0.1);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

  .signal-strip div:nth-child(2n) {
    border-right: 0;
  }

  .section {
    padding: 62px 0;
  }

  .section-header h2,
  .inner-hero h1,
  .contact-band h2 {
    font-size: 1.8rem;
  }

  .step-row {
    grid-template-columns: 1fr;
  }

  .side-feature {
    position: static;
    padding-left: 0;
  }

  .contact-band-actions {
    justify-content: flex-start;
  }

  .info-table th,
  .info-table td {
    display: block;
    width: 100%;
  }

  .info-table th {
    padding-bottom: 6px;
  }

  .info-table td {
    padding-top: 6px;
  }

  .footer-bottom {
    flex-direction: column;
  }
}

@media (max-width: 520px) {
  .header-inner {
    width: min(100% - 24px, 1280px);
  }

  .brand-mark {
    width: 42px;
    height: 42px;
  }

  .hero {
    min-height: 600px;
  }

  .hero h1 {
    font-size: 2.55rem;
  }

  .hero-actions,
  .center-actions,
  .contact-actions,
  .contact-band-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  .signal-strip {
    grid-template-columns: 1fr;
  }

  .signal-strip div,
  .signal-strip div:nth-child(2n) {
    border-right: 0;
  }

  .service-card .card-image-link {
    min-height: 0;
  }
}