/* 炫火科技 Landing — implemented from Claude Design "炫火科技 Landing.dc.html" */

* { box-sizing: border-box; }

:root {
  --bg: #f7f6f3;
  --bg-alt: #efece6;
  --ink: #14110f;
  --muted: #6b655e;
  --faint: #a49c92;
  --line: #ded9d1;
  --accent: #e8541e;
  --accent-dark: #c9430f;
  --accent-warm: #ffb347;
  --pad-x: 72px;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: 'Noto Sans SC', sans-serif;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-dark); }

@keyframes sunDrift {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-18px); }
}

/* reveal-on-scroll */
[data-reveal] {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity .7s cubic-bezier(.2,.7,.3,1), transform .7s cubic-bezier(.2,.7,.3,1);
}
[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; transition: none; }
  .hero-sun { animation: none; }
}

/* nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px var(--pad-x);
  background: rgba(247,246,243,.82);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(222,217,209,.7);
}
.nav-brand { display: flex; align-items: center; gap: 12px; }
.nav-name { font-weight: 700; font-size: 19px; }
.nav-tag {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 11px;
  color: var(--faint);
  letter-spacing: 2px;
  margin-left: 2px;
}
.nav-links { display: flex; gap: 40px; align-items: center; font-size: 15px; }
.nav-links a { color: var(--muted); }
.nav-links a:hover { color: var(--ink); }
.nav-cta,
.nav-links a.nav-cta {
  background: var(--ink);
  color: #fff;
  padding: 10px 22px;
  border-radius: 8px;
}
.nav-links a.nav-cta:hover { color: #fff; background: #2b2620; }

/* hero */
.hero {
  padding: 140px var(--pad-x) 120px;
  position: relative;
  overflow: hidden;
}
.hero-kicker {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 13px;
  letter-spacing: 4px;
  color: var(--accent);
  margin-bottom: 34px;
}
.hero-title {
  font-family: 'Noto Serif SC', serif;
  font-size: 82px;
  line-height: 1.12;
  font-weight: 900;
  margin: 0 0 34px;
  letter-spacing: -1px;
  max-width: 920px;
}
.hero-sub {
  font-size: 20px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 580px;
  margin: 0 0 46px;
  font-weight: 400;
}
.hero-actions { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; }
.btn-primary {
  font-weight: 600;
  font-size: 16px;
  color: #fff;
  background: var(--accent);
  padding: 16px 34px;
  border-radius: 10px;
  transition: background .25s;
}
.btn-primary:hover { background: var(--accent-dark); color: #fff; }
.link-underline {
  font-weight: 500;
  font-size: 16px;
  color: var(--ink);
  padding: 16px 4px;
  border-bottom: 2px solid var(--ink);
}
.link-underline:hover { color: var(--accent); border-color: var(--accent); }
.hero-sun {
  position: absolute;
  top: 130px;
  right: 80px;
  width: 190px;
  height: 190px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, var(--accent-warm), var(--accent) 70%);
  box-shadow: 0 30px 90px rgba(232,84,30,.28);
  animation: sunDrift 7s ease-in-out infinite;
}

/* services */
.services-head { padding: 20px var(--pad-x) 40px; }
.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  border-top: 1px solid var(--line);
  padding-top: 40px;
}
.section-head h2,
.why-head h2 {
  font-family: 'Noto Serif SC', serif;
  font-size: 40px;
  font-weight: 700;
  margin: 0;
}
.section-label {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 13px;
  letter-spacing: 2px;
  color: var(--faint);
}
.services { padding: 0 var(--pad-x) 110px; }
.service-row {
  display: flex;
  gap: 48px;
  align-items: flex-start;
  padding: 42px 0;
  border-top: 1px solid var(--line);
}
.service-row-last { border-bottom: 1px solid var(--line); }
.service-num {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 15px;
  font-weight: 600;
  color: var(--accent);
  width: 56px;
  flex: none;
}
.service-row h3 {
  font-size: 25px;
  font-weight: 700;
  margin: 0;
  width: 280px;
  flex: none;
}
.service-row p {
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
  margin: 0;
  flex: 1;
}

/* why */
.why { padding: 96px var(--pad-x); background: var(--bg-alt); }
.why-head { margin-bottom: 56px; }
.why-head h2 { margin-top: 12px; }
.why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.why-stat {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 44px;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
}
.why-desc {
  margin-top: 14px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--muted);
}

/* contact */
.contact {
  background: var(--ink);
  color: var(--bg);
  padding: 104px var(--pad-x) 60px;
}
.contact h2 {
  font-family: 'Noto Serif SC', serif;
  font-size: 48px;
  font-weight: 900;
  margin: 0 0 20px;
  max-width: 680px;
  letter-spacing: -.5px;
}
.contact-sub {
  font-size: 17px;
  color: var(--faint);
  margin: 0 0 40px;
  max-width: 540px;
}
.btn-invert {
  font-weight: 600;
  font-size: 16px;
  color: var(--ink);
  background: var(--bg);
  padding: 16px 40px;
  border-radius: 10px;
  display: inline-block;
  transition: background .25s;
}
.btn-invert:hover { color: var(--ink); background: #fff; }
.contact-meta {
  margin-top: 72px;
  padding-top: 38px;
  border-top: 1px solid rgba(255,255,255,.12);
  display: flex;
  gap: 72px;
  flex-wrap: wrap;
}
.meta-label {
  font-size: 12px;
  color: #7a736a;
  letter-spacing: 1px;
  margin-bottom: 8px;
}
.meta-value { font-size: 15px; color: #d6d2ca; }
.meta-mono { font-family: 'Space Grotesk', sans-serif; font-size: 18px; color: var(--bg); }
.footer-legal {
  margin-top: 52px;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px 18px;
  flex-wrap: wrap;
  text-align: center;
  font-size: 13px;
}
.copyright { color: #6a635b; }
.icp-link { color: #8f877d; }
.icp-link:hover { color: var(--bg); }

/* responsive */
@media (max-width: 960px) {
  :root { --pad-x: 40px; }
  .hero-title { font-size: 60px; }
  .hero-sun { width: 140px; height: 140px; right: 40px; top: 110px; }
  .service-row { flex-wrap: wrap; }
  .service-row h3 { width: auto; }
  .service-row p { flex-basis: 100%; }
  .why-grid { grid-template-columns: 1fr; gap: 40px; }
}
@media (max-width: 640px) {
  :root { --pad-x: 24px; }
  .nav { padding-top: 16px; padding-bottom: 16px; }
  .nav-links { gap: 20px; font-size: 14px; }
  .nav-links a:not(.nav-cta) { display: none; }
  .nav-tag { display: none; }
  .hero { padding-top: 88px; padding-bottom: 80px; }
  .hero-title { font-size: 42px; }
  .hero-sub { font-size: 17px; }
  .hero-sun { width: 96px; height: 96px; right: 24px; top: 72px; opacity: .9; }
  .section-head h2, .why-head h2 { font-size: 30px; }
  .contact h2 { font-size: 32px; }
  .contact-meta { gap: 32px; }
}