*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: #080c14;
  color: #fff;
  -webkit-font-smoothing: antialiased;
}

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

.icon { width: 1em; height: 1em; display: inline-block; fill: currentColor; }
.icon--lg { width: 28px; height: 28px; color: #fff; }
img { max-width: 100%; display: block; }

.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 clamp(24px, 5vw, 64px); height: 72px;
}
.nav--scrolled { background: rgba(8,12,20,0.9); backdrop-filter: blur(12px); border-bottom: 1px solid rgba(255,255,255,0.06); }
.nav__logo { display: flex; align-items: center; gap: 10px; font-weight: 600; letter-spacing: 0.2em; font-size: 0.8rem; }
.nav__logo-mark { width: 28px; height: 28px; border: 1.5px solid #ff6b4a; border-radius: 50%; display: grid; place-items: center; font-size: 0.6rem; color: #ff6b4a; }
.nav__links { display: flex; gap: clamp(16px, 3vw, 40px); list-style: none; }
.nav__links a { font-size: 0.68rem; letter-spacing: 0.14em; opacity: 0.8; transition: opacity 0.3s; }
.nav__links a:hover { opacity: 1; }
.nav__toggle { display: none; background: none; border: none; color: #fff; cursor: pointer; }
.nav__toggle span { display: block; width: 22px; height: 1px; background: #fff; margin: 5px 0; }

.hero {
  position: relative; min-height: 100vh;
  display: flex; align-items: center; justify-content: center; text-align: center;
  overflow: hidden;
}
.hero__bg { position: absolute; inset: 0; }
.hero__bg img { width: 100%; height: 100%; object-fit: cover; }
.hero__overlay {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(8,12,20,0.2) 0%, rgba(180,60,30,0.15) 40%, rgba(8,12,20,0.75) 100%);
}
.hero__grid {
  position: absolute; inset: 0; opacity: 0.06;
  background-image: linear-gradient(rgba(255,255,255,0.5) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,0.5) 1px, transparent 1px);
  background-size: 80px 80px;
}
.hero__content { position: relative; z-index: 10; padding: 100px 24px 80px; max-width: 900px; }
.hero__badge { width: 64px; height: 64px; border-radius: 50%; background: rgba(160,40,30,0.85); border: 1px dashed rgba(255,255,255,0.3); display: grid; place-items: center; margin: 0 auto 28px; color: #fff; }
.hero__title-wrap { display: flex; align-items: center; gap: 24px; margin-bottom: 20px; }
.hero__line { flex: 1; height: 1px; background: rgba(255,255,255,0.4); }
.hero__title { font-size: clamp(1.4rem, 4vw, 2.6rem); font-weight: 700; letter-spacing: 0.15em; white-space: nowrap; }
.hero__subtitle { font-size: 1rem; font-weight: 300; color: rgba(255,255,255,0.75); line-height: 1.8; max-width: 520px; margin: 0 auto 48px; }
.hero__stats { display: flex; justify-content: center; gap: clamp(32px, 6vw, 64px); padding-top: 32px; border-top: 1px solid rgba(255,255,255,0.15); flex-wrap: wrap; }
.hero__stat-num { font-size: clamp(1.5rem, 3vw, 2.2rem); font-weight: 700; color: #ff6b4a; }
.hero__stat-label { font-size: 0.62rem; letter-spacing: 0.15em; color: rgba(255,255,255,0.4); margin-top: 4px; }
.corner { position: absolute; width: 40px; height: 40px; z-index: 5; pointer-events: none; }
.corner--tl { top: 88px; left: 24px; border-top: 1px solid rgba(255,255,255,0.25); border-left: 1px solid rgba(255,255,255,0.25); }
.corner--br { bottom: 40px; right: 24px; border-bottom: 1px solid rgba(255,255,255,0.25); border-right: 1px solid rgba(255,255,255,0.25); }

.section { padding: 100px clamp(24px, 5vw, 64px); }
.section--alt { background: #0d1220; border-top: 1px solid rgba(255,255,255,0.04); }
.section__inner { max-width: 1100px; margin: 0 auto; }
.section__label { font-size: 0.62rem; letter-spacing: 0.25em; color: rgba(255,255,255,0.35); margin-bottom: 12px; }
.section__title { font-size: clamp(1.4rem, 3vw, 2rem); font-weight: 600; letter-spacing: 0.1em; margin-bottom: 40px; }
.section__intro { color: rgba(255,255,255,0.6); line-height: 1.9; font-weight: 300; max-width: 560px; margin-bottom: 48px; }

.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 24px; }
.feature { border: 1px solid rgba(255,255,255,0.08); background: rgba(255,255,255,0.02); transition: border-color 0.3s; overflow: hidden; }
.feature:hover { border-color: rgba(255,107,74,0.4); }
.feature--img { display: flex; flex-direction: column; }
.feature__img { aspect-ratio: 16/10; overflow: hidden; }
.feature__img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease; }
.feature:hover .feature__img img { transform: scale(1.05); }
.feature__body { padding: 28px 32px 32px; }
.feature__num { font-size: 0.65rem; color: #ff6b4a; letter-spacing: 0.2em; margin-bottom: 16px; }
.feature__title { font-size: 0.9rem; font-weight: 600; letter-spacing: 0.08em; margin-bottom: 10px; }
.feature__desc { font-size: 0.85rem; line-height: 1.75; color: rgba(255,255,255,0.55); font-weight: 300; }

.cases-showcase { display: flex; flex-direction: column; gap: 48px; }
.case-showcase { display: grid; grid-template-columns: 1.2fr 1fr; gap: 0; border: 1px solid rgba(255,255,255,0.08); overflow: hidden; }
.case-showcase--reverse { direction: rtl; }
.case-showcase--reverse > * { direction: ltr; }
.case-showcase__img { aspect-ratio: 16/10; overflow: hidden; min-height: 280px; }
.case-showcase__img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s ease; }
.case-showcase:hover .case-showcase__img img { transform: scale(1.04); }
.case-showcase__content { padding: clamp(32px, 5vw, 56px); display: flex; flex-direction: column; justify-content: center; background: rgba(255,255,255,0.02); }

.contact-banner { position: relative; min-height: 360px; display: flex; align-items: center; justify-content: center; overflow: hidden; }
.contact-banner__bg { position: absolute; inset: 0; }
.contact-banner__bg img { width: 100%; height: 100%; object-fit: cover; }
.contact-banner__overlay { position: absolute; inset: 0; background: linear-gradient(180deg, rgba(8,12,20,0.5) 0%, rgba(8,12,20,0.85) 100%); }
.contact-banner__content { position: relative; z-index: 2; text-align: center; padding: 64px 24px; }
.contact-banner__info { color: rgba(255,255,255,0.7); font-size: 0.95rem; margin-top: 16px; letter-spacing: 0.05em; }

.about { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.about__img { aspect-ratio: 4/3; overflow: hidden; border: 1px solid rgba(255,255,255,0.1); }
.about__img img { width: 100%; height: 100%; object-fit: cover; filter: saturate(1.1); }
.about__text { font-size: 0.9rem; line-height: 2; color: rgba(255,255,255,0.65); font-weight: 300; }

.footer { padding: 40px clamp(24px, 5vw, 64px); border-top: 1px solid rgba(255,255,255,0.06); text-align: center; }
.footer p { font-size: 0.7rem; color: rgba(255,255,255,0.35); letter-spacing: 0.1em; }

@media (max-width: 768px) {
  .nav__toggle { display: block; }
  .nav__links { display: none; position: fixed; top: 72px; left: 0; right: 0; flex-direction: column; background: rgba(8,12,20,0.95); padding: 20px; }
  .nav--open .nav__links { display: flex; }
  .hero__title-wrap { flex-direction: column; gap: 12px; }
  .hero__line { width: 60px; flex: none; }
  .hero__title { white-space: normal; font-size: 1.3rem; }
  .about { grid-template-columns: 1fr; }
  .case-showcase, .case-showcase--reverse { grid-template-columns: 1fr; direction: ltr; }
  .corner { display: none; }
}