/* Mmedia 设计系统 —— spec §六:白底为主/黑幕对比/橙#FF4B18七处点睛/大数字 */
:root {
  --orange: #FF4B18;
  --black: #111111;
  --white: #ffffff;
  --gray-7: #555555;
  --gray-5: #8A8A8A;
  --gray-2: #EDEDED;
  --max-w: 1080px;
}
* { box-sizing: border-box; margin: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
  color: var(--black); background: var(--white); line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
img { max-width: 100%; }
.wrap { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }

/* ── Header ───────────────────────────── */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.92); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--gray-2);
}
.site-header .wrap { display: flex; align-items: center; gap: 28px; height: 64px; }
.site-header .logo { display: flex; align-items: center; margin-right: auto; }
.site-header nav { display: flex; gap: 24px; }
.site-header nav a {
  text-decoration: none; font-size: 15px; color: var(--gray-7); font-weight: 500;
}
.site-header nav a:hover, .site-header nav a[aria-current="page"] { color: var(--orange); }
.lang-switch {
  font-size: 13px; text-decoration: none; color: var(--gray-5);
  border: 1px solid var(--gray-2); border-radius: 6px; padding: 4px 10px;
}
.lang-switch:hover { color: var(--orange); border-color: var(--orange); }

/* ── 按钮 ─────────────────────────────── */
.btn-primary {
  background: var(--orange); color: #fff; padding: 14px 28px; border-radius: 8px;
  font-weight: 600; text-decoration: none; display: inline-block; font-size: 16px;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(255, 75, 24, 0.35); }
.btn-nav { padding: 9px 18px; font-size: 14px; }
.btn-secondary {
  border: 1.5px solid var(--black); color: var(--black); padding: 13px 26px;
  border-radius: 8px; font-weight: 600; text-decoration: none; display: inline-block; font-size: 16px;
}
.section--dark .btn-secondary { border-color: #fff; color: #fff; }
.btn-secondary:hover { border-color: var(--orange); color: var(--orange); }

/* ── Section ──────────────────────────── */
.section { padding: 80px 0; }
.section--dark { background: var(--black); color: #fff; }
.section--dark .muted { color: rgba(255, 255, 255, 0.65); }
.section--gray { background: #fafafa; }
.accent { color: var(--orange); }
.eyebrow {
  display: block; font-size: 13px; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--orange); font-weight: 700; margin-bottom: 14px;
}
.section h2 { font-size: clamp(28px, 4vw, 40px); line-height: 1.25; letter-spacing: -0.01em; margin-bottom: 18px; }
.section h3 { font-size: 20px; margin-bottom: 10px; }
.lead { font-size: 18px; color: var(--gray-7); max-width: 720px; }
.section--dark .lead { color: rgba(255, 255, 255, 0.75); }

/* ── 大数字 ───────────────────────────── */
.stat-number { font-size: clamp(40px, 6vw, 72px); font-weight: 800; letter-spacing: -0.02em; line-height: 1.1; }
.stat-number--accent { color: var(--orange); }

/* ── 卡片 ─────────────────────────────── */
.card { background: var(--white); border: 1px solid var(--gray-2); border-radius: 12px; padding: 28px; }
.card--accent { border-top: 3px solid var(--orange); }
.card h3 { margin-top: 6px; }
a.card, .product-card { text-decoration: none; display: block; transition: transform 0.15s ease, box-shadow 0.15s ease; }
a.card:hover, .product-card:hover { transform: translateY(-2px); box-shadow: 0 10px 30px rgba(17, 17, 17, 0.08); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 36px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; margin-top: 36px; }
.muted { color: var(--gray-7); }
.small { font-size: 14px; color: var(--gray-5); }

/* ── 流程步骤(how-it-works 等) ────────── */
.step-list { list-style: none; padding: 0; margin: 36px 0 0; }
.step-list > li { display: flex; gap: 20px; padding: 22px 0; border-left: 2px solid var(--gray-2); padding-left: 28px; position: relative; }
.step-num {
  position: absolute; left: -17px; top: 22px; width: 32px; height: 32px; border-radius: 50%;
  background: var(--orange); color: #fff; font-weight: 700; font-size: 15px;
  display: flex; align-items: center; justify-content: center;
}

/* ── Blog 文章 ────────────────────────── */
.blog-article h1 { font-size: clamp(28px, 4vw, 40px); line-height: 1.25; margin: 12px 0 20px; }
.blog-article h2 { font-size: 24px; margin: 32px 0 12px; }
.blog-article p { margin: 14px 0; color: var(--gray-7); }
.blog-article ul, .blog-article ol { color: var(--gray-7); margin: 14px 0; padding-left: 24px; display: grid; gap: 8px; }
.blog-article strong { color: var(--black); }
.blog-article blockquote { border-left: 3px solid var(--orange); padding-left: 16px; margin: 16px 0; }

/* ── Footer ───────────────────────────── */
.site-footer { padding: 56px 0 40px; }
.site-footer .wrap { display: flex; flex-direction: column; gap: 24px; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 8px 22px; }
.site-footer nav a { font-size: 14px; color: rgba(255, 255, 255, 0.7); text-decoration: none; }
.site-footer nav a:hover { color: var(--orange); }
.site-footer .legal-line { font-size: 13px; color: rgba(255, 255, 255, 0.5); }

/* ── 响应式 ───────────────────────────── */
@media (max-width: 860px) {
  .site-header nav { display: none; }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .section { padding: 56px 0; }
}