:root {
  --sg-bg: #0f172a;
  --sg-bg-soft: #131c31;
  --sg-surface: #1a2338;
  --sg-surface-2: #212c45;
  --sg-border: rgba(148, 163, 184, 0.16);
  --sg-border-strong: rgba(148, 163, 184, 0.3);
  --sg-text: #e6ecf7;
  --sg-text-soft: #aab6cd;
  --sg-text-dim: #7c8aa5;
  --sg-primary: #22c55e;
  --sg-primary-2: #4ade80;
  --sg-accent: #38bdf8;
  --sg-accent-2: #818cf8;
  --sg-warm: #fbbf24;
  --sg-gradient: linear-gradient(135deg, #22c55e 0%, #16a34a 45%, #0ea5e9 100%);
  --sg-gradient-soft: linear-gradient(135deg, rgba(34, 197, 94, 0.16), rgba(56, 189, 248, 0.12));
  --sg-glow: 0 18px 45px -18px rgba(34, 197, 94, 0.55);
  --sg-shadow: 0 20px 45px -28px rgba(2, 6, 23, 0.9);
  --sg-radius-xs: 10px;
  --sg-radius-sm: 14px;
  --sg-radius: 20px;
  --sg-radius-lg: 28px;
  --sg-radius-pill: 999px;
  --sg-max: 1180px;
  --sg-font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --sg-ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --sg-transition: 0.35s var(--sg-ease);
}

@media (prefers-color-scheme: light) {
  :root {
    --sg-bg: #f3f6fb;
    --sg-bg-soft: #eaf0f9;
    --sg-surface: #ffffff;
    --sg-surface-2: #f7fafc;
    --sg-border: rgba(15, 23, 42, 0.08);
    --sg-border-strong: rgba(15, 23, 42, 0.16);
    --sg-text: #0f172a;
    --sg-text-soft: #46536b;
    --sg-text-dim: #6b7891;
    --sg-shadow: 0 20px 45px -30px rgba(15, 23, 42, 0.28);
    --sg-glow: 0 18px 45px -22px rgba(34, 197, 94, 0.45);
  }
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--sg-font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--sg-text);
  background-color: var(--sg-bg);
  background-image:
    radial-gradient(1100px 620px at 12% -8%, rgba(34, 197, 94, 0.2), transparent 62%),
    radial-gradient(900px 560px at 92% 4%, rgba(56, 189, 248, 0.18), transparent 60%),
    radial-gradient(760px 520px at 50% 108%, rgba(129, 140, 248, 0.16), transparent 64%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a {
  color: var(--sg-primary-2);
  text-decoration: none;
  transition: color var(--sg-transition), opacity var(--sg-transition);
}

a:hover,
a:focus-visible {
  color: var(--sg-accent);
}

a:focus-visible {
  outline: 2px solid var(--sg-accent);
  outline-offset: 3px;
  border-radius: 6px;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0 0 0.6em;
  line-height: 1.3;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--sg-text);
}

h1 {
  font-size: clamp(1.85rem, 4.2vw, 3rem);
  line-height: 1.22;
  letter-spacing: -0.01em;
  background: linear-gradient(120deg, var(--sg-text) 18%, var(--sg-primary-2) 58%, var(--sg-accent) 96%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

h2 {
  font-size: clamp(1.4rem, 2.6vw, 2rem);
  position: relative;
  padding-left: 18px;
}

h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  bottom: 0.18em;
  width: 6px;
  border-radius: var(--sg-radius-pill);
  background: var(--sg-gradient);
  box-shadow: var(--sg-glow);
}

h3 {
  font-size: clamp(1.12rem, 1.9vw, 1.35rem);
  color: var(--sg-text);
}

p {
  margin: 0 0 1em;
  color: var(--sg-text-soft);
}

ul,
ol {
  margin: 0 0 1em;
  padding-left: 1.25em;
  color: var(--sg-text-soft);
}

li {
  margin-bottom: 0.4em;
}

strong {
  color: var(--sg-text);
}

::selection {
  background: rgba(34, 197, 94, 0.32);
  color: var(--sg-text);
}

/* ---------- Header ---------- */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 14px clamp(16px, 4vw, 40px);
  background: rgba(15, 23, 42, 0.62);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--sg-border);
  box-shadow: 0 12px 40px -30px rgba(2, 6, 23, 0.95);
  animation: sg-slide-down 0.7s var(--sg-ease) both;
}

@media (prefers-color-scheme: light) {
  header {
    background: rgba(255, 255, 255, 0.72);
  }
}

header > div {
  max-width: var(--sg-max);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
}

header > div > a {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 1.24rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--sg-text);
  padding: 6px 4px;
  white-space: nowrap;
}

header > div > a::before {
  content: "丝";
  display: inline-grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 800;
  color: #04140a;
  background: var(--sg-gradient);
  box-shadow: var(--sg-glow);
  transition: transform var(--sg-transition);
}

header > div > a:hover::before {
  transform: rotate(-8deg) scale(1.06);
}

header > div > a:hover {
  color: var(--sg-primary-2);
}

header nav ul {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
}

header nav li {
  margin: 0;
}

header nav a {
  display: inline-block;
  padding: 8px 13px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--sg-text-soft);
  border-radius: var(--sg-radius-pill);
  border: 1px solid transparent;
  transition: color var(--sg-transition), background var(--sg-transition), border-color var(--sg-transition), transform var(--sg-transition);
}

header nav a:hover,
header nav a:focus-visible {
  color: var(--sg-text);
  background: var(--sg-gradient-soft);
  border-color: var(--sg-border-strong);
  transform: translateY(-2px);
}

/* ---------- Main ---------- */
main {
  max-width: var(--sg-max);
  margin: 0 auto;
  padding: clamp(24px, 4vw, 48px) clamp(16px, 4vw, 40px) 64px;
  display: block;
}

section {
  position: relative;
  margin-bottom: clamp(28px, 4vw, 48px);
  padding: clamp(22px, 3.4vw, 40px);
  background: linear-gradient(160deg, var(--sg-surface) 0%, var(--sg-surface-2) 100%);
  border: 1px solid var(--sg-border);
  border-radius: var(--sg-radius-lg);
  box-shadow: var(--sg-shadow);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  overflow: hidden;
  animation: sg-rise 0.8s var(--sg-ease) both;
}

section::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  background: linear-gradient(140deg, rgba(255, 255, 255, 0.06), transparent 42%);
  opacity: 0.8;
}

section > * {
  position: relative;
  z-index: 1;
}

section:hover {
  border-color: var(--sg-border-strong);
}

/* ---------- Hero ---------- */
#hero {
  padding: clamp(34px, 6vw, 72px) clamp(22px, 4vw, 52px);
  background:
    linear-gradient(135deg, rgba(34, 197, 94, 0.22) 0%, rgba(14, 165, 233, 0.18) 48%, rgba(129, 140, 248, 0.2) 100%),
    linear-gradient(160deg, var(--sg-surface) 0%, var(--sg-surface-2) 100%);
  border: 1px solid var(--sg-border-strong);
  text-align: left;
  isolation: isolate;
}

#hero::before {
  content: "";
  position: absolute;
  z-index: 0;
  width: 520px;
  height: 520px;
  right: -140px;
  top: -200px;
  border-radius: 50%;
  background: radial-gradient(circle at center, rgba(34, 197, 94, 0.38), transparent 68%);
  filter: blur(12px);
  animation: sg-float 9s ease-in-out infinite;
  pointer-events: none;
}

#hero h1 {
  margin-bottom: 0.5em;
  max-width: 22ch;
}

#hero p {
  max-width: 68ch;
  font-size: 1.02rem;
  color: var(--sg-text-soft);
}

#hero p:last-child {
  display: inline-block;
  margin-top: 8px;
  margin-bottom: 0;
  padding: 8px 18px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--sg-primary-2);
  background: rgba(34, 197, 94, 0.12);
  border: 1px solid rgba(34, 197, 94, 0.32);
  border-radius: var(--sg-radius-pill);
  letter-spacing: 0.02em;
}

/* ---------- Breadcrumb ---------- */
nav[aria-label="面包屑导航"] {
  margin-bottom: clamp(20px, 3vw, 32px);
}

nav[aria-label="面包屑导航"] ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 10px 18px;
  list-style: none;
  font-size: 0.86rem;
  color: var(--sg-text-dim);
  background: rgba(148, 163, 184, 0.08);
  border: 1px solid var(--sg-border);
  border-radius: var(--sg-radius-pill);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

nav[aria-label="面包屑导航"] li {
  margin: 0;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

nav[aria-label="面包屑导航"] li + li::before {
  content: "/";
  color: var(--sg-text-dim);
  opacity: 0.7;
}

nav[aria-label="面包屑导航"] a {
  color: var(--sg-text-soft);
}

nav[aria-label="面包屑导航"] a:hover {
  color: var(--sg-primary-2);
}

/* ---------- Cards & grids ---------- */
#products,
#solutions,
#cases,
#news,
#articles,
#faq,
#howto,
#contact,
#sitemap,
#links,
#legal {
  scroll-margin-top: 96px;
}

#products h3,
#solutions h3,
#cases h3 {
  display: inline-block;
  margin-top: 1.2em;
  padding: 6px 16px;
  font-size: 1.02rem;
  color: var(--sg-text);
  background: var(--sg-gradient-soft);
  border: 1px solid var(--sg-border-strong);
  border-radius: var(--sg-radius-pill);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

#products p,
#solutions p,
#cases p {
  max-width: 82ch;
}

#cases p {
  padding: 14px 18px;
  margin-bottom: 12px;
  background: rgba(148, 163, 184, 0.06);
  border-left: 3px solid var(--sg-primary);
  border-radius: var(--sg-radius-sm);
  transition: transform var(--sg-transition), background var(--sg-transition), border-color var(--sg-transition);
}

#cases p:hover {
  transform: translateX(6px);
  background: rgba(34, 197, 94, 0.09);
  border-left-color: var(--sg-accent);
}

/* ---------- News ---------- */
#news h3 {
  margin-top: 1.4em;
  margin-bottom: 0.3em;
  padding-bottom: 0.4em;
  border-bottom: 1px dashed var(--sg-border-strong);
  transition: color var(--sg-transition), border-color var(--sg-transition);
}

#news h3:hover {
  color: var(--sg-primary-2);
  border-bottom-color: var(--sg-primary);
}

#news h3 + p {
  font-size: 0.82rem;
  color: var(--sg-text-dim);
  letter-spacing: 0.03em;
}

/* ---------- Articles ---------- */
#articles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: clamp(16px, 2.4vw, 26px);
  align-items: stretch;
}

#articles > h2 {
  grid-column: 1 / -1;
}

#articles article {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 24px 22px;
  background: linear-gradient(155deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.015));
  border: 1px solid var(--sg-border);
  border-radius: var(--sg-radius);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  transition: transform var(--sg-transition), border-color var(--sg-transition), box-shadow var(--sg-transition), background var(--sg-transition);
  overflow: hidden;
}

#articles article::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--sg-gradient);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--sg-transition);
}

#articles article:hover {
  transform: translateY(-8px);
  border-color: var(--sg-border-strong);
  box-shadow: 0 26px 50px -30px rgba(34, 197, 94, 0.55);
  background: linear-gradient(155deg, rgba(34, 197, 94, 0.1), rgba(56, 189, 248, 0.06));
}

#articles article:hover::before {
  transform: scaleX(1);
}

#articles article h3 {
  margin-bottom: 0.45em;
  font-size: 1.08rem;
  line-height: 1.45;
}

#articles article p {
  font-size: 0.92rem;
  margin-bottom: 0.8em;
}

#articles article p:first-of-type {
  font-size: 0.78rem;
  color: var(--sg-text-dim);
  letter-spacing: 0.04em;
}

#articles article p:last-of-type {
  margin-top: auto;
  margin-bottom: 0;
}

#articles article a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--sg-primary-2);
  background: rgba(34, 197, 94, 0.12);
  border: 1px solid rgba(34, 197, 94, 0.3);
  border-radius: var(--sg-radius-pill);
  transition: background var(--sg-transition), color var(--sg-transition), transform var(--sg-transition), box-shadow var(--sg-transition);
}

#articles article a::after {
  content: "→";
  transition: transform var(--sg-transition);
}

#articles article a:hover {
  color: #04140a;
  background: var(--sg-gradient);
  transform: translateY(-2px);
  box-shadow: var(--sg-glow);
}

#articles article a:hover::after {
  transform: translateX(4px);
}

/* ---------- FAQ ---------- */
#faq h3 {
  position: relative;
  margin-top: 1.5em;
  padding: 14px 18px 14px 46px;
  font-size: 1.02rem;
  background: rgba(148, 163, 184, 0.07);
  border: 1px solid var(--sg-border);
  border-radius: var(--sg-radius-sm);
  transition: background var(--sg-transition), border-color var(--sg-transition), transform var(--sg-transition);
}

#faq h3::before {
  content: "Q";
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  font-size: 0.72rem;
  font-weight: 800;
  color: #04140a;
  background: var(--sg-gradient);
  border-radius: 8px;
}

#faq h3:hover {
  background: rgba(34, 197, 94, 0.1);
  border-color: rgba(34, 197, 94, 0.35);
  transform: translateX(4px);
}

#faq h3 + p {
  margin-top: -0.2em;
  padding: 0 4px 0 18px;
  font-size: 0.94rem;
  border-left: 2px solid var(--sg-border-strong);
}

/* ---------- HowTo ---------- */
#howto h3 {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 1.3em;
  font-size: 1.02rem;
  color: var(--sg-accent);
}

#howto h3::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--sg-gradient);
  box-shadow: 0 0 0 4px rgba(34, 197, 94, 0.16);
}

#howto p:last-of-type {
  margin-bottom: 0;
  padding: 16px 20px;
  font-size: 0.95rem;
  color: var(--sg-text);
  background: var(--sg-gradient-soft);
  border: 1px solid var(--sg-border-strong);
  border-radius: var(--sg-radius-sm);
}

/* ---------- Contact ---------- */
#contact p {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 12px;
  margin-bottom: 10px;
  padding: 12px 18px;
  font-size: 0.94rem;
  background: rgba(148, 163, 184, 0.06);
  border: 1px solid var(--sg-border);
  border-radius: var(--sg-radius-sm);
  transition: background var(--sg-transition), transform var(--sg-transition), border-color var(--sg-transition);
}

#contact p:hover {
  background: rgba(34, 197, 94, 0.08);
  border-color: rgba(34, 197, 94, 0.3);
  transform: translateX(5px);
}

#contact p:last-child {
  margin-bottom: 0;
}

/* ---------- Sitemap & Links ---------- */
#sitemap ul,
#links ul {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

#sitemap li,
#links li {
  margin: 0;
}

#sitemap a,
#links a {
  display: inline-block;
  padding: 9px 18px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--sg-text-soft);
  background: rgba(148, 163, 184, 0.08);
  border: 1px solid var(--sg-border);
  border-radius: var(--sg-radius-pill);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  transition: color var(--sg-transition), background var(--sg-transition), border-color var(--sg-transition), transform var(--sg-transition), box-shadow var(--sg-transition);
}

#sitemap a:hover,
#links a:hover {
  color: #04140a;
  background: var(--sg-gradient);
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: var(--sg-glow);
}

/* ---------- Legal ---------- */
#legal h2 {
  margin-top: 1.4em;
  font-size: clamp(1.15rem, 2vw, 1.4rem);
}

#legal h2:first-of-type {
  margin-top: 0;
}

#legal p {
  font-size: 0.94rem;
  color: var(--sg-text-soft);
}

/* ---------- Footer ---------- */
footer {
  position: relative;
  margin-top: 20px;
  padding: clamp(28px, 4vw, 46px) clamp(16px, 4vw, 40px);
  text-align: center;
  background: linear-gradient(180deg, rgba(15, 23, 42, 0.4), rgba(15, 23, 42, 0.85));
  border-top: 1px solid var(--sg-border);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
}

@media (prefers-color-scheme: light) {
  footer {
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.5), rgba(243, 246, 251, 0.92));
  }
}

footer p {
  margin: 0 auto 8px;
  max-width: 720px;
  font-size: 0.86rem;
  color: var(--sg-text-dim);
  letter-spacing: 0.02em;
}

footer p:first-child {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--sg-text-soft);
}

footer p:last-child {
  margin-bottom: 0;
}

/* ---------- Scroll animations ---------- */
@keyframes sg-rise {
  from {
    opacity: 0;
    transform: translateY(28px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes sg-slide-down {
  from {
    opacity: 0;
    transform: translateY(-18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes sg-float {
  0%,
  100% {
    transform: translate3d(0, 0, 0) scale(1);
  }
  50% {
    transform: translate3d(-24px, 26px, 0) scale(1.06);
  }
}

@supports (animation-timeline: view()) {
  section {
    animation: sg-rise linear both;
    animation-timeline: view();
    animation-range: entry 0% cover 26%;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  header > div {
    justify-content: center;
    text-align: center;
  }

  header nav ul {
    justify-content: center;
  }

  header nav a {
    padding: 7px 11px;
    font-size: 0.85rem;
  }

  #articles {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  }
}

@media (max-width: 640px) {
  body {
    font-size: 15px;
    line-height: 1.72;
  }

  header {
    padding: 10px 14px;
  }

  header > div {
    flex-direction: column;
    gap: 10px;
  }

  header nav ul {
    gap: 2px;
  }

  header nav a {
    padding: 6px 10px;
    font-size: 0.8rem;
  }

  main {
    padding: 20px 14px 48px;
  }

  section {
    padding: 22px 18px;
    border-radius: var(--sg-radius);
    margin-bottom: 22px;
  }

  #hero {
    padding: 30px 20px;
  }

  #hero h1 {
    max-width: 100%;
  }

  #hero p {
    font-size: 0.96rem;
  }

  #hero::before {
    width: 340px;
    height: 340px;
    right: -120px;
    top: -140px;
  }

  h2 {
    padding-left: 14px;
  }

  h2::before {
    width: 4px;
  }

  #articles {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  #articles article {
    padding: 20px 18px;
  }

  #faq h3 {
    padding: 12px 14px 12px 42px;
    font-size: 0.98rem;
  }

  #contact p {
    padding: 10px 14px;
    font-size: 0.9rem;
  }

  #sitemap a,
  #links a {
    padding: 8px 14px;
    font-size: 0.84rem;
  }

  nav[aria-label="面包屑导航"] ol {
    padding: 9px 14px;
    font-size: 0.8rem;
  }
}

@media (max-width: 380px) {
  header nav a {
    padding: 5px 8px;
    font-size: 0.76rem;
  }

  #hero h1 {
    font-size: 1.6rem;
  }
}

/* ---------- Print ---------- */
@media print {
  header,
  footer,
  #links,
  #sitemap {
    display: none;
  }

  body {
    background: #fff;
    color: #000;
  }

  section {
    box-shadow: none;
    border: 1px solid #ccc;
    break-inside: avoid;
  }
}