/* ===== 设计令牌：深蓝/近黑 + 低饱和深青强调色，克制清晰 ===== */
:root {
  --accent: #0e7c7b;          /* 低饱和深青 */
  --accent-dark: #0a6463;
  --ink: #0a1128;             /* 近黑深蓝 */
  --ink-2: #33415c;
  --muted: #5b6b84;
  --line: #e4e9f0;
  --bg: #ffffff;
  --bg-alt: #f6f8fb;
  --bg-dark: #0a1128;
  --radius: 14px;
  --shadow: 0 8px 24px rgba(10, 17, 40, .07);
  --shadow-lg: 0 20px 48px rgba(10, 17, 40, .12);
  --font: "Inter", "PingFang SC", "Microsoft YaHei", -apple-system, "Segoe UI", Roboto, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
section[id] { scroll-margin-top: 5rem; }
body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }
.container { width: min(1080px, 92%); margin: 0 auto; }
.center { text-align: center; }

h1 { font-size: clamp(2rem, 4.6vw, 3.1rem); line-height: 1.2; letter-spacing: -.02em; font-weight: 800; }
h2 { font-size: clamp(1.55rem, 3.2vw, 2.2rem); letter-spacing: -.02em; font-weight: 750; }
h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: .5rem; }

.eyebrow {
  display: inline-block;
  font-size: .78rem; font-weight: 700; letter-spacing: .14em;
  text-transform: uppercase; color: var(--accent); margin-bottom: .8rem;
}
.eyebrow.center { display: block; }
.section-sub { color: var(--muted); max-width: 620px; margin: .8rem auto 0; }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: .85rem 1.7rem; border-radius: 8px;
  font-weight: 650; font-size: .95rem; transition: .22s ease;
  border: 1px solid transparent; cursor: pointer;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-dark); }
.btn-ghost { border-color: var(--line); color: var(--ink); background: #fff; }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

/* ===== 导航 ===== */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, .9);
  backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid transparent; transition: .25s ease;
}
.nav.scrolled { border-bottom-color: var(--line); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: .6rem; font-weight: 800; font-size: 1.15rem; }
.brand-mark {
  width: 32px; height: 32px; border-radius: 8px;
  background: var(--ink);
  color: #fff; display: grid; place-items: center; font-weight: 800;
}
.nav-links { display: flex; align-items: center; gap: 2rem; font-size: .93rem; color: var(--ink-2); }
.nav-links a { transition: color .2s; }
.nav-links a:hover { color: var(--accent); }
.nav-cta {
  padding: .5rem 1.1rem; border-radius: 8px;
  background: var(--ink); color: #fff !important; font-weight: 650;
}
.nav-cta:hover { background: var(--accent); }
.nav-toggle { display: none; background: none; border: 0; cursor: pointer; flex-direction: column; gap: 5px; padding: 6px; }
.nav-toggle span { width: 22px; height: 2px; background: var(--ink); border-radius: 2px; transition: .25s; }

/* ===== Hero：克制留白，无大面积渐变 ===== */
.hero {
  padding: clamp(5rem, 11vw, 8.5rem) 0 clamp(4rem, 8vw, 6.5rem);
  background: var(--bg);
}
.hero-inner { max-width: 780px; margin: 0 auto; text-align: center; }
.hero-sub { color: var(--muted); font-size: 1.06rem; max-width: 36em; margin: 1.3rem auto 2rem; }
.hero-actions { display: flex; gap: .9rem; flex-wrap: wrap; justify-content: center; }
.center-actions { justify-content: center; margin-top: 1.6rem; }

/* ===== 信任信号条 ===== */
.trustbar { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--bg-alt); }
.trustbar-grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 1rem; padding: 1.6rem 0;
}
.trust-item { text-align: center; }
.trust-item strong { display: block; font-size: .98rem; font-weight: 750; color: var(--ink); }
.trust-item span { font-size: .82rem; color: var(--muted); }

/* ===== 通用区块 ===== */
.section { padding: clamp(4.5rem, 9vw, 7rem) 0; }
.section-alt { background: var(--bg-alt); }
.grid { display: grid; gap: 1.3rem; margin-top: 2.8rem; }
.grid-2 { grid-template-columns: repeat(2, 1fr); max-width: 860px; margin-left: auto; margin-right: auto; }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.7rem; transition: border-color .25s ease, box-shadow .25s ease;
}
.card:hover { border-color: var(--accent); box-shadow: var(--shadow); }
.card p { color: var(--muted); font-size: .93rem; }
.card-feature { border-top: 2px solid var(--accent); }

.settle-note { margin-top: 1.8rem; color: var(--muted); font-size: .93rem; }
.settle-note strong { color: var(--ink); }

/* ===== 流程 ===== */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.3rem; margin-top: 2.8rem; }
.step {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.6rem;
}
.section:not(.section-alt) .step { background: var(--bg-alt); }
.step-num {
  display: inline-grid; place-items: center; width: 32px; height: 32px;
  border-radius: 50%; background: var(--ink); color: #fff;
  font-weight: 800; font-size: .9rem; margin-bottom: .9rem;
}
.step p { color: var(--muted); font-size: .9rem; }

/* ===== CTA ===== */
.section-cta { background: var(--ink); color: #fff; }
.section-cta h2 { color: #fff; }
.section-cta .section-sub { color: #8fa0b8; }
.section-cta .btn-primary { background: var(--accent); color: #fff; }
.section-cta .btn-primary:hover { background: var(--accent-dark); }
.cta-note { margin-top: 1.2rem; font-size: .88rem; color: #8fa0b8; }
.cta-note a { color: #fff; font-weight: 650; }
.cta-note a:hover { color: var(--accent); }

/* ===== 页脚 ===== */
.footer { padding: 3rem 0 2rem; background: var(--bg-dark); color: #8fa0b8; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; gap: 2rem; flex-wrap: wrap; padding-bottom: 1.6rem; border-bottom: 1px solid rgba(255,255,255,.08); }
.footer-brand { display: flex; align-items: center; gap: .8rem; color: #fff; }
.footer-brand .brand-mark { background: rgba(255,255,255,.12); }
.footer-brand p { font-size: .85rem; color: #8fa0b8; }
.footer-links { display: flex; gap: 1.6rem; font-size: .88rem; flex-wrap: wrap; }
.footer-links a:hover { color: #fff; }
.footer-legal { padding-top: 1.4rem; font-size: .8rem; line-height: 1.7; }

/* ===== 入场动画 ===== */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .6s ease, transform .6s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ===== 转化层新增元素 ===== */
.hero-audience {
  margin-top: 2rem; font-size: .9rem; color: var(--muted);
}
.card-evidence {
  margin-top: 1rem; padding-top: .8rem;
  border-top: 1px solid var(--line);
  font-size: .8rem; color: var(--muted);
}
.flow-note {
  margin-top: 1.6rem; text-align: center;
  font-size: .8rem; color: var(--muted);
}
.flow-cta { margin-top: 1.2rem; text-align: center; }
.flow-cta a { color: var(--accent); font-weight: 650; font-size: .95rem; }
.flow-cta a:hover { text-decoration: underline; }
.footer-contact { display: inline-flex; flex-direction: column; gap: .15rem; }
.footer-contact small { font-size: .78rem; color: #6b7c96; }

/* ===== 响应式 ===== */
@media (max-width: 960px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .nav-toggle { display: flex; }
  .nav-links {
    position: absolute; top: 64px; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: #fff; border-bottom: 1px solid var(--line);
    padding: .5rem 4%; display: none; box-shadow: var(--shadow-lg);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: .85rem .4rem; border-top: 1px solid var(--line); }
  .nav-links a:first-child { border-top: 0; }
  .nav-cta { text-align: center; margin: .6rem 0; }
  .grid-4, .grid-2, .steps { grid-template-columns: 1fr; }
  .trustbar-grid { grid-template-columns: repeat(2, 1fr); gap: 1.2rem 1rem; }
  .hero-actions .btn { width: 100%; }
}

/* ===== 适用场景矩阵 ===== */
.scenes-grid {
  margin-top: 2.5rem;
}
.scene-card {
  background: #ffffff;
  border: 1px solid rgba(10, 17, 40, 0.08);
  border-radius: 1rem;
  padding: 1.75rem 1.5rem;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.scene-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(10, 17, 40, 0.08);
}
.scene-card h3 {
  font-size: 1.05rem;
  margin: 0 0 0.6rem;
  color: #0a1128;
}
.scene-card p {
  font-size: 0.9rem;
  line-height: 1.65;
  color: rgba(10, 17, 40, 0.68);
  margin: 0;
}
@media (max-width: 960px) {
  .scenes-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .scenes-grid { grid-template-columns: 1fr; }
  .scene-card { padding: 1.4rem 1.2rem; }
}

/* ===== 资金流示意 ===== */
.flow-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin: 2.5rem 0 1.5rem;
  flex-wrap: wrap;
}
.flow-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  background: #ffffff;
  border: 1px solid rgba(10, 17, 40, 0.08);
  border-radius: 0.75rem;
  padding: 0.9rem 1.1rem;
  min-width: 96px;
}
.flow-node span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  background: #0e7c7b;
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 600;
}
.flow-node strong {
  font-size: 0.82rem;
  color: #0a1128;
  white-space: nowrap;
}
.flow-node-end {
  border-color: #0e7c7b;
  background: rgba(14, 124, 123, 0.06);
}
.flow-arrow {
  color: rgba(10, 17, 40, 0.3);
  font-size: 1rem;
  user-select: none;
}
@media (max-width: 640px) {
  .flow-visual { flex-direction: column; gap: 0.4rem; }
  .flow-arrow { transform: rotate(90deg); }
}

/* ===== 底部 CTA 零门槛话术 ===== */
.cta-zero-risk {
  font-size: 0.88rem;
  color: rgba(10, 17, 40, 0.55);
  margin: 1rem 0 0.5rem;
}
/* 该话术位于深色 CTA 区块内，深色文字不可读，故追加浅色覆盖（仅新增，不改既有规则） */
.section-cta .cta-zero-risk {
  color: rgba(255, 255, 255, 0.72);
}

/* ===== 品牌 LOGO（SVG 图片） ===== */
img.brand-mark {
  display: inline-block;
  object-fit: contain;
  vertical-align: middle;
  /* 原 span.brand-mark 带深色底与大写字母色，图片替换后需去掉底色避免深方块 */
  background: transparent;
  border-radius: 0;
  flex-shrink: 0;
}
.footer-brand img.brand-mark {
  background: transparent;
}