/* ============ 热地科技官网 — 深色科技风 ============ */

:root {
  --bg: #060913;
  --bg-alt: #0a1020;
  --bg-card: rgba(255, 255, 255, 0.03);
  --border: rgba(255, 255, 255, 0.08);
  --border-hl: rgba(230, 47, 71, 0.45);
  --text: #e8ecf4;
  --text-muted: #8b93a8;
  --accent: #f43f5e;
  --accent2: #ff8fa3;
  --grad: linear-gradient(90deg, #fb7185, #ff8fa3);
  --radius: 14px;
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; overflow-x: hidden; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

::selection { background: rgba(230, 47, 71, 0.4); }

/* ---------- 导航 ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  transition: background 0.3s, border-color 0.3s, backdrop-filter 0.3s;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(6, 9, 19, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom-color: var(--border);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }

.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); }
.logo-img { height: 30px; width: auto; display: block; }
.logo-text { font-weight: 700; font-size: 16px; letter-spacing: 0.5px; }
.logo-text em { font-style: normal; font-weight: 400; font-size: 11px; color: var(--text-muted); margin-left: 6px; letter-spacing: 2px; }

.nav-links { display: flex; align-items: center; gap: 26px; }
.nav-links a {
  color: var(--text-muted); text-decoration: none; font-size: 14px;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--text); }
.nav-cta {
  padding: 7px 16px; border: 1px solid var(--border-hl); border-radius: 999px;
  color: var(--text) !important;
  transition: background 0.2s, box-shadow 0.2s;
}
.nav-cta:hover { background: rgba(230, 47, 71, 0.15); box-shadow: 0 0 18px rgba(230, 47, 71, 0.25); }

.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--text); margin: 5px 0; transition: 0.3s; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex; align-items: center;
  padding: 140px 0 100px;
  overflow: hidden;
}
.hero-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, #000 30%, transparent 75%);
}
.hero-glow { position: absolute; border-radius: 50%; filter: blur(120px); opacity: 0.35; pointer-events: none; }
.hero-glow-1 { width: 560px; height: 560px; background: #d91f3f; top: -180px; left: -120px; }
.hero-glow-2 { width: 480px; height: 480px; background: #8f1d33; bottom: -160px; right: -100px; }

.hero-inner { position: relative; text-align: center; }

.hero-badge {
  display: inline-block;
  font-size: 13px; letter-spacing: 2px; color: var(--accent2);
  border: 1px solid rgba(255, 143, 163, 0.3);
  background: rgba(255, 143, 163, 0.06);
  padding: 6px 18px; border-radius: 999px;
  margin-bottom: 28px;
}
.hero-title {
  font-size: clamp(32px, 5.4vw, 58px);
  font-weight: 800; line-height: 1.3; letter-spacing: 1px;
  margin-bottom: 24px;
}
.grad {
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-sub {
  max-width: 720px; margin: 0 auto 36px;
  color: var(--text-muted); font-size: 17px;
}
.hero-path {
  display: flex; justify-content: center; align-items: center; flex-wrap: wrap;
  gap: 12px; margin-bottom: 40px; font-size: 15px;
}
.hero-path span {
  padding: 8px 18px; border-radius: 999px;
  border: 1px solid var(--border); background: var(--bg-card);
}
.hero-path span.hl { border-color: var(--border-hl); background: rgba(230, 47, 71, 0.14); }
.hero-path i { color: var(--text-muted); font-style: normal; }

.hero-actions { display: flex; justify-content: center; gap: 16px; margin-bottom: 56px; flex-wrap: wrap; }

.btn {
  display: inline-block; padding: 13px 34px; border-radius: 999px;
  font-size: 15px; font-weight: 600; text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
}
.btn-primary {
  color: #fff; background: linear-gradient(90deg, #f43f5e, #d91f3f);
  box-shadow: 0 4px 24px rgba(230, 47, 71, 0.4);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 32px rgba(230, 47, 71, 0.55); }
.btn-ghost { color: var(--text); border: 1px solid var(--border); background: var(--bg-card); }
.btn-ghost:hover { border-color: var(--border-hl); background: rgba(230, 47, 71, 0.08); }

.hero-keywords { display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; }
.hero-keywords code {
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 12px; letter-spacing: 2px; color: var(--text-muted);
  border: 1px solid var(--border); border-radius: 6px; padding: 4px 10px;
}

/* ---------- 通用区块 ---------- */
.section { padding: 110px 0; position: relative; }
.section-alt { background: var(--bg-alt); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }

.section-head { max-width: 780px; margin-bottom: 56px; }
.section-no {
  font-size: 13px; letter-spacing: 3px; color: var(--accent2);
  margin-bottom: 14px; font-weight: 600;
}
.section-head h2 { font-size: clamp(26px, 3.6vw, 38px); font-weight: 800; line-height: 1.4; margin-bottom: 18px; }
.section-desc { color: var(--text-muted); font-size: 16px; }
.section-desc strong { color: var(--text); }

/* ---------- 卡片 ---------- */
.cards-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.cards-5 { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; }

.card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 26px 24px;
  transition: transform 0.25s, border-color 0.25s, box-shadow 0.25s;
}
.card:hover {
  transform: translateY(-4px); border-color: var(--border-hl);
  box-shadow: 0 12px 40px rgba(230, 47, 71, 0.12);
}
.card h3 { font-size: 18px; margin-bottom: 10px; }
.card p { font-size: 14px; color: var(--text-muted); }
.card-tag {
  display: inline-block; font-size: 12px !important; color: var(--accent2) !important;
  border: 1px solid rgba(255, 143, 163, 0.3); border-radius: 999px;
  padding: 2px 12px; margin-bottom: 14px;
}
.card .ok { color: #a7f3d0; margin-bottom: 8px; }
.card .ok::before { content: "✓ "; }
.card .miss { color: var(--text-muted); }
.card .miss::before { content: "✕ "; color: #f87171; }

.insight {
  margin-top: 32px; padding: 28px 32px;
  border: 1px solid var(--border-hl); border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(230, 47, 71, 0.1), rgba(255, 143, 163, 0.05));
  display: flex; align-items: center; gap: 24px;
}
.insight-label {
  flex-shrink: 0; font-size: 13px; font-weight: 700; letter-spacing: 2px;
  color: var(--accent2); border-right: 1px solid var(--border-hl); padding-right: 24px;
}
.insight p { font-size: 16px; }

/* ---------- 解决方案 pipeline ---------- */
.pipeline { max-width: 860px; margin: 0 auto; }
.pipe-stage {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 30px 32px;
}
.pipe-core {
  border-color: var(--border-hl);
  background: linear-gradient(135deg, rgba(230, 47, 71, 0.12), rgba(255, 143, 163, 0.05));
  box-shadow: 0 0 50px rgba(230, 47, 71, 0.12);
}
.pipe-learning { border-style: dashed; }
.pipe-no { font-size: 13px; letter-spacing: 2px; color: var(--accent2); font-weight: 700; margin-bottom: 8px; }
.pipe-stage h3 { font-size: 19px; margin-bottom: 16px; }
.pipe-map { font-size: 15px; color: var(--text); text-align: center; }
.pipe-to { text-align: center; color: var(--accent2); font-size: 18px; margin: 4px 0 10px; }
.pipe-arrow { text-align: center; color: var(--accent2); font-size: 22px; padding: 10px 0; opacity: 0.7; }

.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chips span {
  font-size: 13px; padding: 5px 14px; border-radius: 999px;
  border: 1px solid var(--border); background: rgba(255, 255, 255, 0.02);
  color: var(--text-muted);
}
.chips-core span { border-color: var(--border-hl); color: var(--text); background: rgba(230, 47, 71, 0.1); }

.suite-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-bottom: 18px; }
.suite-grid > div {
  border: 1px solid var(--border); border-radius: 10px; padding: 16px;
  background: rgba(255, 255, 255, 0.02);
}
.suite-grid h4 { font-size: 15px; margin-bottom: 6px; color: var(--accent2); }
.suite-grid p { font-size: 13px; color: var(--text-muted); line-height: 1.8; }

/* ---------- 产品主张 ---------- */
.claim { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-bottom: 64px; }
.claim-col {
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 30px; background: var(--bg-card);
}
.claim-col h3 { font-size: 20px; margin-bottom: 12px; }
.claim-col p { color: var(--text-muted); font-size: 15px; }
.claim-tag {
  display: inline-block; font-size: 12px; font-weight: 600; letter-spacing: 1px;
  color: var(--accent2); border: 1px solid rgba(255, 143, 163, 0.3);
  border-radius: 999px; padding: 3px 12px; margin-right: 10px;
  vertical-align: 3px;
}

.versus { display: grid; grid-template-columns: 1fr auto 1fr; gap: 20px; align-items: stretch; }
.vs-col { border-radius: var(--radius); padding: 30px; border: 1px solid var(--border); }
.vs-old { background: rgba(255, 255, 255, 0.02); opacity: 0.75; }
.vs-new {
  background: linear-gradient(135deg, rgba(230, 47, 71, 0.14), rgba(255, 143, 163, 0.06));
  border-color: var(--border-hl);
  box-shadow: 0 0 50px rgba(230, 47, 71, 0.12);
}
.vs-col h3 { font-size: 18px; margin-bottom: 18px; }
.vs-col ol { list-style: none; counter-reset: vs; }
.vs-col ol li {
  counter-increment: vs; position: relative;
  padding: 9px 0 9px 44px; font-size: 15px; color: var(--text-muted);
  border-bottom: 1px dashed rgba(255, 255, 255, 0.06);
}
.vs-col ol li:last-child { border-bottom: none; }
.vs-col ol li::before {
  content: "0" counter(vs);
  position: absolute; left: 0; top: 9px;
  font-size: 13px; font-weight: 700; color: var(--accent2);
  font-family: "SF Mono", Menlo, monospace;
}
.vs-new ol li { color: var(--text); }
.vs-mid { display: flex; align-items: center; }
.vs-mid span {
  writing-mode: vertical-lr; letter-spacing: 6px; font-size: 14px; font-weight: 700;
  background: var(--grad); -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.vs-note { text-align: center; color: var(--text-muted); font-size: 14px; margin-top: 28px; }

/* ---------- 对象模型 ---------- */
.obj-chain {
  display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 48px;
}
.obj-chain span {
  position: relative; font-size: 14px; padding: 9px 18px;
  border: 1px solid var(--border); border-radius: 10px; background: var(--bg-card);
}
.obj-chain span + span::before {
  content: "→"; position: absolute; left: -13px; top: 50%; transform: translateY(-50%);
  color: var(--accent2); font-size: 12px;
}
.obj-chain span.hl {
  border-color: var(--border-hl);
  background: rgba(230, 47, 71, 0.16); font-weight: 600;
}
.cards-5 .card { padding: 22px 18px; }
.cards-5 .card h3 { font-size: 16px; }
.cards-5 .card p { font-size: 13px; }

/* ---------- Learning ---------- */
.steps-8 {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-bottom: 44px;
}
.step {
  border: 1px solid var(--border); border-radius: 12px;
  background: var(--bg-card); padding: 20px 18px;
  font-size: 14px; font-weight: 600;
  transition: border-color 0.2s, transform 0.2s;
}
.step:hover { border-color: var(--border-hl); transform: translateY(-3px); }
.step i {
  display: block; font-style: normal; font-size: 13px; font-weight: 700;
  color: var(--accent2); margin-bottom: 6px;
  font-family: "SF Mono", Menlo, monospace;
}
.learn-foot { border: 1px solid var(--border); border-radius: var(--radius); padding: 28px 32px; background: var(--bg-card); }
.learn-foot > p { margin-bottom: 20px; font-size: 15px; color: var(--text-muted); }
.learn-foot strong { color: var(--text); }
.learn-cases { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.learn-cases h4 { font-size: 15px; color: var(--accent2); margin-bottom: 6px; }
.learn-cases p { font-size: 14px; color: var(--text-muted); }

/* ---------- 应用生成 ---------- */
.gen-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 20px; }
.gen-col {
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px; background: var(--bg-card);
}
.gen-col h3 { font-size: 19px; margin-bottom: 4px; }
.gen-sub { font-size: 13px; color: var(--accent2); margin-bottom: 18px; }
.gen-steps { list-style: none; }
.gen-steps li {
  padding: 8px 0 8px 24px; position: relative;
  font-size: 14px; color: var(--text-muted);
  border-bottom: 1px dashed rgba(255, 255, 255, 0.06);
}
.gen-steps li:last-child { border-bottom: none; }
.gen-steps li::before { content: "▸"; position: absolute; left: 4px; color: var(--accent2); }
.gen-result h4 { font-size: 14px; margin: 12px 0 6px; color: var(--text); }
.gen-result h4:first-child { margin-top: 0; }
.gen-result p { font-size: 13px; color: var(--text-muted); line-height: 1.9; }

/* ---------- CTA ---------- */
.cta { position: relative; text-align: center; overflow: hidden; }
.cta-glow {
  position: absolute; width: 700px; height: 700px; border-radius: 50%;
  background: #d91f3f; filter: blur(160px); opacity: 0.22;
  top: 50%; left: 50%; transform: translate(-50%, -50%);
  pointer-events: none;
}
.cta-inner { position: relative; }
.cta h2 { font-size: clamp(26px, 4vw, 42px); font-weight: 800; line-height: 1.4; margin-bottom: 20px; }
.cta p { max-width: 640px; margin: 0 auto 36px; color: var(--text-muted); }
.cta-actions { margin-bottom: 48px; }
.cta-contact { display: flex; justify-content: center; gap: 40px; flex-wrap: wrap; color: var(--text-muted); font-size: 14px; }
.cta-contact a { color: var(--accent2); text-decoration: none; }
.cta-contact a:hover { text-decoration: underline; }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--border); padding: 48px 0; }
.footer-inner { display: flex; flex-direction: column; align-items: center; gap: 12px; text-align: center; }
.footer-slogan { font-size: 13px; color: var(--text-muted); letter-spacing: 1px; }
.footer-copy { font-size: 12px; color: rgba(139, 147, 168, 0.6); }

/* ---------- 滚动动效 ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .cards-3, .gen-grid, .claim { grid-template-columns: 1fr; }
  .cards-5 { grid-template-columns: repeat(2, 1fr); }
  .steps-8 { grid-template-columns: repeat(2, 1fr); }
  .versus { grid-template-columns: 1fr; }
  .vs-mid { justify-content: center; }
  .vs-mid span { writing-mode: horizontal-tb; letter-spacing: 3px; }
  .learn-cases { grid-template-columns: 1fr; }
  .insight { flex-direction: column; align-items: flex-start; gap: 12px; }
  .insight-label { border-right: none; padding-right: 0; border-bottom: 1px solid var(--border-hl); padding-bottom: 10px; }
}

@media (max-width: 720px) {
  .nav-links {
    position: fixed; top: 64px; left: 0; right: 0;
    flex-direction: column; align-items: flex-start; gap: 0;
    background: rgba(6, 9, 19, 0.97); backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border);
    padding: 12px 24px 20px;
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 0; width: 100%; font-size: 15px; }
  .nav-cta { margin-top: 8px; }
  .nav-toggle { display: block; }
  .nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle.open span:nth-child(2) { opacity: 0; }
  .nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  .section { padding: 72px 0; }
  .cards-5 { grid-template-columns: 1fr; }
  .steps-8 { grid-template-columns: 1fr 1fr; }
  .hero { padding: 120px 0 80px; }
  .cta-contact { gap: 16px; flex-direction: column; }
}