/* OpenSourceSDRLab 官网样式。页面由 build.py 生成。
   配色取自公司原图 logo（assets/logo.png）：红 #D80925、蓝 #156EAF、黄 #F7B52C、绿 #86BC43、深蓝 #1B1464。
   页头页脚用白底放原图 logo；主视觉用深蓝底，频谱曲线用 logo 里声波的绿和书本的黄。 */
:root {
  --brand-red: #D80925;
  --brand-blue: #156EAF;
  --brand-yellow: #F7B52C;
  --brand-green: #86BC43;
  --brand-navy: #1B1464;
  --ink: #0E1638;          /* 主视觉、内页页眉的深蓝底 */
  --ink-2: #141D45;
  --ink-3: #1B2944;
  --signal: var(--brand-green);
  --accent: var(--brand-red);
  --accent-ink: #FFFFFF;
  --bg: #F6F5F1;
  --panel: #FFFFFF;
  --tint: #EEF3F6;
  --line: #E1E4E8;
  --text: #16213A;
  --muted: #4B5871;
  --soft: #6E7A90;
  --on-dark: #EEF2F6;
  --on-dark-soft: #A9B6CB;
  --radius: 16px;
  --max: 1160px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", Roboto, Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body { margin: 0; padding: 0; }
body { background: var(--bg); color: var(--text); line-height: 1.65; font-size: 16px; -webkit-font-smoothing: antialiased; }
a { color: var(--brand-blue); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 { letter-spacing: -0.01em; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 820px; }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 12px; z-index: 50; background: #fff; padding: 6px 12px; border-radius: 8px; }

/* 图标 */
.ic { width: 22px; height: 22px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; flex: none; }
.ic-sm { width: 16px; height: 16px; }
.ic-lg { width: 30px; height: 30px; }
.ic-xl { width: 44px; height: 44px; stroke-width: 1.4; }

/* ---------- 页头 ---------- */
.nav { background: rgba(255, 255, 255, 0.96); backdrop-filter: saturate(140%) blur(8px); color: var(--text); position: sticky; top: 0; z-index: 20; border-bottom: 1px solid var(--line); }
.nav .wrap { display: flex; align-items: center; gap: 28px; min-height: 76px; }
.brand { display: inline-flex; align-items: center; flex: none; }
.brand:hover { text-decoration: none; }
.logo { display: block; height: 66px; width: auto; margin: -4px 0; }   /* 原图 800x227（透明边约 12%），按高度等比缩放 */
@media (max-width: 520px) { .logo { height: 50px; } }
.menu { display: flex; gap: 26px; flex: 1; margin: 0; padding: 0; list-style: none; }
.menu a { color: var(--muted); font-size: 15px; font-weight: 500; }
.menu a:hover, .menu a[aria-current="page"] { color: var(--brand-navy); text-decoration: none; }
.menu a[aria-current="page"] { box-shadow: inset 0 -2px 0 var(--brand-blue); padding-bottom: 4px; }
.nav-actions { display: flex; align-items: center; gap: 12px; }
.lang-switch { color: var(--muted); border: 1px solid var(--line); border-radius: 999px; padding: 4px 12px; font-size: 13px; white-space: nowrap; }
.lang-switch:hover { color: var(--brand-navy); border-color: #B9C6D6; text-decoration: none; }

.menu-toggle { display: none; }
@media (max-width: 880px) {
  .nav .wrap { flex-wrap: wrap; gap: 12px; padding-top: 10px; padding-bottom: 10px; }
  .menu-toggle { display: block; margin-left: auto; color: var(--text); }
  .menu-toggle summary { cursor: pointer; list-style: none; border: 1px solid var(--line); border-radius: 999px; padding: 4px 14px; font-size: 14px; }
  .menu-toggle summary::-webkit-details-marker { display: none; }
  .menu, .nav-actions { display: none; flex: none; flex-basis: 100%; width: 100%; }
  .menu-toggle[open] ~ .menu { display: flex; flex-direction: column; gap: 14px; padding: 10px 0; }
  .menu-toggle[open] ~ .nav-actions { display: flex; padding-bottom: 10px; }
}

/* ---------- 按钮 ---------- */
.btn { display: inline-flex; align-items: center; gap: 8px; border-radius: 999px; padding: 9px 20px; font-weight: 600; font-size: 15px; white-space: nowrap; border: 1.5px solid transparent; transition: transform .15s ease, filter .15s ease, background .15s ease; }
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-lg { padding: 12px 26px; font-size: 16px; }
.btn-accent { background: var(--accent); color: var(--accent-ink); }
.btn-accent:hover { filter: brightness(1.06); }
.btn-primary { background: var(--brand-blue); color: #FFFFFF; }
.btn-outline { border-color: var(--brand-blue); color: var(--brand-blue); background: transparent; }
.btn-ghost { border-color: rgba(238,242,246,0.4); color: var(--on-dark); }
.btn-ghost:hover { border-color: var(--on-dark); }
.actions { display: flex; gap: 12px; flex-wrap: wrap; }

/* ---------- 首页主视觉 ---------- */
.hero { position: relative; overflow: hidden; background: radial-gradient(1200px 520px at 85% -10%, #1F3F86 0%, transparent 60%), var(--ink); color: var(--on-dark); }
.hero-bg { position: absolute; inset: auto 0 0 0; height: 78%; pointer-events: none;
  -webkit-mask-image: linear-gradient(90deg, transparent 0%, rgba(0,0,0,.25) 30%, #000 62%); mask-image: linear-gradient(90deg, transparent 0%, rgba(0,0,0,.25) 30%, #000 62%); }
@media (max-width: 700px) { .hero-bg { height: 45%; -webkit-mask-image: none; mask-image: none; opacity: .5; } }
.hero-bg svg { width: 100%; height: 100%; display: block; }
.spec { animation: drift 9s ease-in-out infinite alternate; transform-origin: center bottom; }
.spec-2 { animation-duration: 13s; }
@keyframes drift { from { transform: scaleY(0.92); } to { transform: scaleY(1.06); } }
@media (prefers-reduced-motion: reduce) { .spec { animation: none; } }
.hero-inner { position: relative; padding: 104px 24px 132px; }
.eyebrow { display: inline-block; margin: 0 0 18px; font-size: 13px; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; color: var(--brand-yellow); }
.hero h1 { font-size: clamp(34px, 5.4vw, 60px); line-height: 1.12; margin: 0 0 20px; max-width: 900px; }
.hero .lead { font-size: clamp(16px, 1.6vw, 19px); color: var(--on-dark-soft); max-width: 680px; margin: 0 0 34px; }

/* 信任条 */
.trust { background: var(--ink-2); color: var(--on-dark); border-top: 1px solid rgba(255,255,255,.06); }
.trust-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px 28px; padding-top: 26px; padding-bottom: 26px; }
.trust-item { display: flex; gap: 12px; align-items: flex-start; }
.trust-item .ic { color: var(--signal); margin-top: 3px; }
.trust-item strong { display: block; font-size: 15px; }
.trust-item span { font-size: 13.5px; color: var(--on-dark-soft); }
@media (max-width: 900px) { .trust-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .trust-grid { grid-template-columns: 1fr; } }

/* ---------- 区块 ---------- */
.section { padding: 80px 0; }
.section-alt { background: var(--tint); }
.section h2 { font-size: clamp(24px, 3vw, 34px); line-height: 1.25; margin: 0 0 12px; color: var(--ink); }
.kicker { margin: 0 0 8px; font-size: 13px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--brand-blue); }
.sub { color: var(--muted); margin: 0 0 26px; max-width: 620px; }
.head-row { display: flex; align-items: flex-end; justify-content: space-between; gap: 20px; margin-bottom: 30px; }
.link-more { display: inline-flex; align-items: center; gap: 6px; font-weight: 600; white-space: nowrap; }

/* 产品卡片 */
.pgrid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
@media (max-width: 960px) { .pgrid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 620px) { .pgrid { grid-template-columns: 1fr; } .head-row { flex-direction: column; align-items: flex-start; } }
.pcard { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; display: flex; flex-direction: column; gap: 10px; color: var(--text); transition: border-color .15s ease, box-shadow .15s ease, transform .15s ease; }
.pcard:hover { text-decoration: none; border-color: #B9C6D6; box-shadow: 0 10px 30px rgba(11,19,36,.08); transform: translateY(-2px); }
.pcard-top { display: flex; justify-content: space-between; align-items: center; gap: 10px; color: var(--brand-blue); }
.ptag { font-size: 12.5px; color: var(--soft); text-align: right; }
.pcard h3 { margin: 6px 0 0; font-size: 20px; color: var(--ink); }
.pcard p { margin: 0; color: var(--muted); font-size: 15px; }
.pcard .more { margin-top: auto; padding-top: 6px; display: inline-flex; align-items: center; gap: 6px; font-weight: 600; color: var(--brand-blue); }
.chips { list-style: none; margin: 4px 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.chips li { font-size: 12.5px; padding: 3px 10px; border-radius: 999px; background: var(--tint); color: var(--ink-3); border: 1px solid #DCE4EC; white-space: nowrap; }

/* 资料区 */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
@media (max-width: 860px) { .split { grid-template-columns: 1fr; gap: 32px; } }
.latest { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px 24px; }
.latest h3 { margin: 0 0 8px; font-size: 16px; color: var(--soft); font-weight: 600; }
.latest ul { list-style: none; margin: 0; padding: 0; }
.latest li + li { border-top: 1px solid var(--line); }
.latest a { display: flex; align-items: center; gap: 14px; padding: 13px 0; color: var(--text); }
.latest a:hover { text-decoration: none; color: var(--brand-blue); }
.latest .date { font-size: 13px; color: var(--soft); font-variant-numeric: tabular-nums; white-space: nowrap; }
.latest .ttl { flex: 1; font-weight: 500; }

/* 社区 */
.cgrid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 26px; }
@media (max-width: 900px) { .cgrid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .cgrid { grid-template-columns: 1fr; } }
.ccard { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; display: flex; flex-direction: column; gap: 6px; color: var(--text); }
.ccard:hover { text-decoration: none; border-color: #B9C6D6; }
.ccard .ic { color: var(--brand-blue); width: 26px; height: 26px; }
.ccard strong { font-size: 17px; color: var(--ink); }
.ccard span { color: var(--muted); font-size: 14.5px; }

/* 行动区 */
.cta { background: linear-gradient(120deg, var(--ink) 0%, var(--brand-navy) 100%); color: var(--on-dark); }
.cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding-top: 56px; padding-bottom: 56px; }
.cta h2 { margin: 0 0 6px; font-size: clamp(22px, 2.6vw, 30px); }
.cta p { margin: 0; color: var(--on-dark-soft); }
@media (max-width: 760px) { .cta-inner { flex-direction: column; align-items: flex-start; } }

/* ---------- 内页 ---------- */
.page-hero { background: radial-gradient(900px 380px at 90% -20%, #1F3F86 0%, transparent 60%), var(--ink); color: var(--on-dark); padding: 72px 0 56px; }
.page-hero h1 { font-size: clamp(30px, 4.4vw, 46px); line-height: 1.15; margin: 0 0 16px; }
.page-hero .lead { color: var(--on-dark-soft); font-size: 17px; max-width: 760px; margin: 0; }
.toc { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 30px; }
.toc a { display: inline-flex; align-items: center; gap: 8px; color: var(--on-dark); border: 1px solid #33456A; border-radius: 999px; padding: 6px 14px; font-size: 14px; }
.toc a:hover { border-color: var(--signal); text-decoration: none; }
.toc .ic { color: var(--signal); }

.plist { display: flex; flex-direction: column; gap: 22px; }
.pline { display: grid; grid-template-columns: 240px 1fr; gap: 32px; align-items: start; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 32px; scroll-margin-top: 90px; }
/* 产品主图（2026-11-11 从官方商城取的主图，800×800 白底）：暗色模式下也保持白底，照片才自然 */
.pline-photo { display: block; aspect-ratio: 1; background: #FFFFFF; border: 1px solid var(--line); border-radius: 14px; overflow: hidden; }
.pline-photo img { width: 100%; height: 100%; object-fit: contain; display: block; transition: transform .25s ease; }
.pline-photo:hover img { transform: scale(1.03); }
.pline h2 { font-size: 26px; margin: 0 0 10px; color: var(--ink); }
.pline p { margin: 0 0 6px; color: var(--muted); max-width: 760px; }
.pline-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 22px; }
.pline h4 { margin: 0 0 8px; font-size: 13px; letter-spacing: .06em; text-transform: uppercase; color: var(--soft); }
.pmodels ul, .pdocs ul { list-style: none; margin: 0; padding: 0; }
.pmodels li a { display: inline-flex; align-items: center; gap: 6px; padding: 4px 0; font-weight: 600; }
.pdocs li { padding: 4px 0; }
.pdocs li a { color: var(--text); border-bottom: 1px solid #C9D3DF; }
.pdocs li a:hover { color: var(--brand-blue); text-decoration: none; border-color: var(--brand-blue); }
@media (max-width: 760px) {
  .pline { grid-template-columns: 1fr; padding: 24px; gap: 16px; }
  .pline-photo { max-width: 280px; }
  .pline-cols { grid-template-columns: 1fr; }
}

.cards4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 26px; }
@media (max-width: 960px) { .cards4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .cards4 { grid-template-columns: 1fr; } }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; display: flex; flex-direction: column; gap: 8px; }
.card .ic { color: var(--brand-blue); }
.card h3 { margin: 6px 0 0; font-size: 18px; color: var(--ink); }
.card p { margin: 0; color: var(--muted); font-size: 15px; }

.partners { display: grid; gap: 14px; }
.partner { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px 24px; display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.partner strong { font-size: 19px; color: var(--ink); }
.partner span { color: var(--soft); font-size: 14px; }

.contacts { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin-top: 26px; max-width: 900px; }
@media (max-width: 520px) { .contacts { grid-template-columns: 1fr; } }
.contact { display: flex; gap: 14px; align-items: flex-start; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; color: var(--text); overflow-wrap: anywhere; }
.contact:hover { text-decoration: none; border-color: #B9C6D6; }
.contact .ic { color: var(--brand-blue); margin-top: 2px; }
.contact strong { display: block; color: var(--ink); }
.contact span { font-size: 14.5px; color: var(--muted); }

/* ---------- 页脚 ---------- */
.footer { background: #FFFFFF; color: var(--muted); font-size: 14.5px; border-top: 1px solid var(--line); }
.fgrid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 32px; padding-top: 56px; padding-bottom: 40px; }
@media (max-width: 900px) { .fgrid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .fgrid { grid-template-columns: 1fr; } }
.fcol h4 { color: var(--brand-navy); margin: 0 0 12px; font-size: 14px; }
.fcol ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.fcol a { color: var(--muted); }
.fcol a:hover { color: var(--brand-blue); }
.fbrand p { margin: 12px 0 0; max-width: 300px; }
.mail { display: inline-flex; align-items: center; gap: 8px; color: var(--brand-blue) !important; }
.social { display: flex; gap: 10px; margin-top: 16px; }
.social a { width: 36px; height: 36px; border-radius: 10px; border: 1px solid var(--line); display: inline-flex; align-items: center; justify-content: center; color: var(--muted); }
.social a:hover { color: var(--brand-blue); border-color: var(--brand-blue); }
.social .ic { width: 18px; height: 18px; }
.fbottom { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; border-top: 1px solid var(--line); padding-top: 18px; padding-bottom: 22px; font-size: 13px; }
.fbottom a { color: var(--soft); }