/*
Theme Name: BITPRO
Description: BITPRO 批头产品展示主题（B2B 纯展示，无价格）。
Version: 2.8
*/
:root {
  --ink: #101828;
  --muted: #667085;
  --line: #e6e8ec;
  --bg: #f6f7f9;
  --card: #ffffff;
  --navy: #0b2545;
  --blue: #145cb8;
  --blue-dark: #0f4a94;
  --blue-soft: #eef4fd;
  --radius: 16px;
  --shadow: 0 1px 3px rgba(16, 24, 40, 0.07), 0 12px 32px rgba(16, 24, 40, 0.08);
  --shadow-hover: 0 2px 6px rgba(16, 24, 40, 0.09), 0 20px 40px rgba(16, 24, 40, 0.14);
}
* { box-sizing: border-box; }
body { margin: 0; font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Arial, sans-serif; color: var(--ink); background: var(--bg); line-height: 1.65; -webkit-font-smoothing: antialiased; }
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: none; }
.wrap { max-width: 1180px; margin: 0 auto; padding: 0 24px; }
.site-header { background: rgba(255, 255, 255, 0.96); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 50; }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; height: 76px; gap: 24px; }
.logo { display: flex; align-items: center; gap: 12px; font-size: 24px; font-weight: 800; color: var(--navy); letter-spacing: 1.5px; }
.logo img { height: 52px; width: auto; display: block; }
.main-nav ul { list-style: none; margin: 0; padding: 0; display: flex; gap: 32px; }
.main-nav a { color: var(--ink); font-size: 16px; font-weight: 500; padding: 6px 2px; border-bottom: 2px solid transparent; }
.main-nav a:hover { color: var(--blue); border-bottom-color: var(--blue); }
.lang-switch { font-size: 14px; white-space: nowrap; background: #f2f4f7; border: 1px solid var(--line); border-radius: 999px; padding: 4px; }
.lang-switch a { color: var(--muted); padding: 4px 12px; border-radius: 999px; font-weight: 500; }
.lang-switch a.on { color: var(--navy); background: #fff; box-shadow: 0 1px 3px rgba(16, 24, 40, 0.12); font-weight: 700; }
.lang-switch a:hover { color: var(--navy); }
.lang-switch span { display: none; }
.hero { background: linear-gradient(90deg, rgba(11, 37, 69, 0.97) 0%, rgba(11, 37, 69, 0.90) 38%, rgba(11, 37, 69, 0.45) 62%, rgba(11, 37, 69, 0.20) 100%), url('images/hero.webp') center right / cover no-repeat; color: #fff; padding: 84px 0 76px; min-height: 520px; display: flex; align-items: center; }
.hero .wrap { width: 100%; }
.hero-eyebrow { font-size: 13px; letter-spacing: 3px; text-transform: uppercase; color: #9fc3f0; margin: 0 0 16px; font-weight: 700; }
.hero h1 { font-size: 56px; margin: 0 0 14px; letter-spacing: 3px; line-height: 1.1; }
.hero p { color: #d0d9e6; font-size: 19px; margin: 0 0 32px; max-width: 720px; }
.btn { display: inline-block; background: linear-gradient(180deg, #1a6fd6, var(--blue)); color: #fff; padding: 13px 30px; border-radius: 999px; font-size: 16px; font-weight: 600; transition: transform 0.15s ease, background 0.15s ease, box-shadow 0.15s ease; box-shadow: 0 6px 18px rgba(20, 92, 184, 0.38); }
.btn:hover { background: linear-gradient(180deg, var(--blue), var(--blue-dark)); color: #fff; transform: translateY(-1px); }
.btn-ghost { background: transparent; border: 1px solid rgba(255, 255, 255, 0.5); margin-left: 12px; box-shadow: none; }
.btn-ghost:hover { background: #fff; color: var(--navy); border-color: #fff; }
.section { padding: 56px 0; }
.bit-chart-section { padding-bottom: 48px; }
.bit-chart-link { display: block; width: 100%; }
.bit-chart-img { display: block; width: 100%; height: auto; border: 1px solid #e5e9f0; border-radius: 16px; box-shadow: 0 8px 24px rgba(11, 37, 69, 0.08); background: #fff; }
.section h2 { font-size: 28px; margin: 0 0 24px; letter-spacing: -0.5px; line-height: 1.3; color: var(--navy); }
.cat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.cat-card { background: var(--card); padding: 26px 24px; border-radius: var(--radius); border: 1px solid var(--line); transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease; }
.cat-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); border-color: #c7d8f0; }
.cat-card h3 { margin: 0 0 8px; font-size: 20px; color: var(--ink); }
.cat-card span { color: var(--muted); font-size: 14px; }
.prod-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.prod-head { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin: 0 0 24px; }
.prod-head h2 { margin: 0; }
.view-toggle { display: none; background: #f2f4f7; border: 1px solid var(--line); border-radius: 999px; padding: 4px; white-space: nowrap; flex-shrink: 0; }
.view-toggle-btn { border: 0; background: transparent; color: var(--muted); padding: 5px 7px; border-radius: 999px; cursor: pointer; line-height: 0; }
.view-toggle-btn svg { display: block; }
.view-toggle-btn.on { color: var(--navy); background: #fff; box-shadow: 0 1px 3px rgba(16, 24, 40, 0.12); }
.prod-card { background: var(--card); border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line); display: flex; flex-direction: column; transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease; }
.prod-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); border-color: #c7d8f0; }
.prod-card .thumb { aspect-ratio: 1 / 1; overflow: hidden; background: #ffffff; padding: 18px; display: flex; align-items: center; justify-content: center; }
.prod-card .thumb img { width: 100%; height: 100%; object-fit: contain; display: block; transition: transform 0.25s ease; }
.prod-card:hover .thumb img { transform: scale(1.04); }
.prod-card .info { padding: 18px 18px 20px; flex: 1; }
.prod-card h3 { font-size: 17px; margin: 0 0 6px; line-height: 1.45; }
.prod-card h3 a { color: var(--ink); }
.prod-card h3 a:hover { color: var(--blue); }
.prod-card .meta { color: var(--muted); font-size: 13px; margin: 0; line-height: 1.5; }
.filter { margin-bottom: 26px; display: flex; flex-wrap: wrap; gap: 10px; }
.filter a { background: #fff; border: 1px solid var(--line); padding: 8px 18px; border-radius: 999px; color: var(--ink); font-size: 14px; font-weight: 500; transition: all 0.15s ease; white-space: nowrap; }
.filter a:hover, .filter a.on { background: var(--navy); color: #fff; border-color: var(--navy); }
.prod-single { display: grid; grid-template-columns: 1fr 1fr; gap: 44px; background: var(--card); padding: 36px; border-radius: var(--radius); border: 1px solid var(--line); box-shadow: var(--shadow); }
.prod-single .photo { background: #f2f4f7; border-radius: 12px; padding: 24px; display: flex; align-items: center; justify-content: center; }
.prod-single .photo img { width: 100%; height: auto; display: block; border-radius: 4px; object-fit: contain; }
.spec-table { width: 100%; border-collapse: collapse; margin: 20px 0; }
.spec-table th, .spec-table td { border-bottom: 1px solid var(--line); padding: 12px 4px; text-align: left; font-size: 15px; }
.spec-table th { color: var(--muted); font-weight: 500; width: 110px; font-size: 14px; }
.spec-table td { font-weight: 500; }
.badge { display: inline-block; background: var(--blue-soft); color: var(--blue-dark); border: 1px solid #c7d8f0; padding: 4px 12px; border-radius: 999px; font-size: 13px; font-weight: 600; margin-bottom: 14px; }
.breadcrumb { color: var(--muted); font-size: 14px; margin-bottom: 20px; }
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--blue); }
.page-box { background: var(--card); padding: 36px; border-radius: var(--radius); border: 1px solid var(--line); box-shadow: var(--shadow); }
.page-box p { color: var(--muted); }
.custom-page h3 { font-size: 22px; margin: 36px 0 20px; }
.custom-intro { font-size: 18px; color: var(--muted); max-width: 760px; line-height: 1.8; margin: 0 0 8px; }
.custom-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.custom-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); }
.custom-card h4 { margin: 0 0 8px; font-size: 18px; }
.custom-card p { margin: 0; color: var(--muted); line-height: 1.7; }
.custom-steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.custom-step { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.custom-step-num { font-size: 32px; font-weight: 700; color: var(--blue); margin-bottom: 8px; }
.custom-step h4 { margin: 0 0 8px; font-size: 18px; }
.custom-step p { margin: 0; color: var(--muted); line-height: 1.7; }
.custom-cta { margin-top: 36px; background: var(--navy); border-radius: var(--radius); padding: 32px; }
.custom-cta p { color: #d0d9e6; line-height: 1.8; margin: 0 0 20px; max-width: 760px; }
.contact-page h3 { font-size: 22px; margin: 36px 0 20px; }
.contact-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.contact-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); }
.contact-card h4 { margin: 0 0 8px; font-size: 18px; }
.contact-card p { margin: 0; }
.contact-card a { font-weight: 600; word-break: break-all; }
.contact-include { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.contact-include .custom-card h4 { margin: 0; }
.contact-note { color: var(--muted); line-height: 1.8; margin: 28px 0 0; max-width: 760px; }
.site-footer { background: linear-gradient(180deg, #0b2545, #081c36); color: #a8b6c8; padding: 40px 0; margin-top: 32px; font-size: 14px; }
.site-footer p { margin: 4px 0; }
.site-footer strong { color: #fff; }
.footer-contact { display: grid; grid-template-columns: 1fr 1.2fr; gap: 48px; padding-top: 16px; padding-bottom: 32px; border-bottom: 1px solid rgba(255, 255, 255, 0.15); }
.footer-info h3, .footer-form h3 { color: #fff; font-size: 22px; margin: 0 0 16px; }
.footer-info p { color: #a8b6c8; margin: 10px 0; line-height: 1.7; }
.footer-info a { color: #fff; font-weight: 600; }
.footer-info a:hover { color: #9fc3f0; }
.contact-line { display: flex; align-items: center; justify-content: space-between; gap: 12px; background: rgba(255, 255, 255, 0.07); border: 1px solid rgba(255, 255, 255, 0.14); border-radius: 12px; padding: 12px 14px; margin: 12px 0; }
.contact-line span { color: #8fa0b3; font-size: 13px; letter-spacing: 0.5px; flex-shrink: 0; }
.contact-line a { word-break: break-all; text-align: right; }
.footer-form { background: rgba(255, 255, 255, 0.04); border: 1px solid rgba(255, 255, 255, 0.12); border-radius: 16px; padding: 24px; }
.footer-form label { display: block; color: #d0d9e6; font-size: 14px; margin-bottom: 14px; }
.footer-form input, .footer-form textarea { display: block; width: 100%; margin-top: 6px; padding: 12px 14px; border-radius: 10px; border: 1px solid rgba(255, 255, 255, 0.25); background: rgba(255, 255, 255, 0.08); color: #fff; font: inherit; font-size: 15px; }
.footer-form input:focus, .footer-form textarea:focus { outline: none; border-color: #9fc3f0; background: rgba(255, 255, 255, 0.14); }
.footer-form input::placeholder, .footer-form textarea::placeholder { color: #8fa0b3; }
.hp-field { display: none !important; }
.form-msg { padding: 12px 16px; border-radius: 10px; margin-bottom: 16px; font-size: 14px; }
.form-msg.ok { background: rgba(52, 168, 83, 0.2); color: #d7f5dd; border: 1px solid rgba(52, 168, 83, 0.4); }
.form-msg.err { background: rgba(220, 53, 53, 0.2); color: #ffd7d7; border: 1px solid rgba(220, 53, 53, 0.4); }
.form-note { color: #8fa0b3; font-size: 13px; margin-top: 12px; }
.footer-bottom { padding-top: 28px; }
@media (max-width: 900px) {
  .site-footer { padding: 32px 0; }
  .footer-contact { grid-template-columns: 1fr; gap: 28px; }
  .footer-info h3, .footer-form h3 { font-size: 20px; }
  .footer-form { padding: 20px; }
  .prod-grid { grid-template-columns: repeat(2, 1fr); }
  .cat-grid { grid-template-columns: repeat(2, 1fr); }
  .custom-grid, .custom-steps { grid-template-columns: repeat(2, 1fr); }
  .contact-include { grid-template-columns: repeat(2, 1fr); }
  .prod-single { grid-template-columns: 1fr; padding: 24px; gap: 28px; }
  .hero { padding: 56px 0 48px; min-height: 420px; }
  .hero h1 { font-size: 38px; }
  .main-nav ul { gap: 16px; }
}
@media (max-width: 560px) {
  .site-footer { padding: 28px 0 32px; }
  .site-footer .wrap { padding-left: 24px; padding-right: 24px; }
  .footer-contact { gap: 24px; padding-top: 0; padding-bottom: 24px; }
  .contact-line { flex-direction: row; align-items: center; gap: 8px; padding: 12px 14px; }
  .contact-line span { font-size: 12px; }
  .contact-line a { text-align: right; font-size: 14px; }
  .footer-form { padding: 20px 18px; }
  .footer-form label { font-size: 15px; margin-bottom: 16px; }
  .footer-form input, .footer-form textarea { font-size: 16px; padding: 14px 16px; }
  .footer-form .btn { width: 100%; padding: 15px; font-size: 16px; }
  .form-note { line-height: 1.6; }
  .footer-bottom { text-align: center; padding-top: 24px; }
  .footer-bottom p { font-size: 13px; }
  .prod-grid { grid-template-columns: 1fr; }
  .view-toggle { display: flex; }
  .filter { gap: 8px; margin-bottom: 20px; }
  .filter a { font-size: 13px; padding: 7px 14px; }
  .prod-grid.prod-grid-2col { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .prod-grid.prod-grid-2col .prod-card .info { padding: 14px 12px 16px; }
  .prod-grid.prod-grid-2col .prod-card h3 { font-size: 15px; }
  .prod-grid.prod-grid-2col .prod-card .meta { font-size: 12px; }
  .custom-grid, .custom-steps { grid-template-columns: 1fr; }
  .custom-page h3 { margin: 28px 0 16px; }
  .custom-cta { padding: 24px; }
  .contact-grid, .contact-include { grid-template-columns: 1fr; }
  .contact-page h3 { margin: 28px 0 16px; }
  .cat-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .cat-card { padding: 16px 14px; }
  .cat-card h3 { font-size: 16px; line-height: 1.35; }
  .cat-card span { font-size: 12px; }
  .site-header .wrap { height: auto; flex-wrap: wrap; padding: 14px 20px; gap: 10px; }
  .main-nav { order: 3; width: 100%; }
  .main-nav ul { gap: 18px; }
  .bit-chart-section { padding-bottom: 32px; }
  .bit-chart-img { border-radius: 12px; }
  .hero { min-height: 0; background: linear-gradient(90deg, rgba(11, 37, 69, 0.96) 0%, rgba(11, 37, 69, 0.88) 55%, rgba(11, 37, 69, 0.60) 100%), url('images/hero.webp') center right / cover no-repeat; }
  .hero h1 { font-size: 34px; }
  .btn-ghost { margin-left: 0; margin-top: 10px; }
}

.filter.filter-scroll { flex-wrap: nowrap; overflow-x: auto; padding-bottom: 4px; scrollbar-width: none; -webkit-overflow-scrolling: touch; }
.filter.filter-scroll::-webkit-scrollbar { display: none; }
.filter.filter-scroll a { flex-shrink: 0; }

.announcement-bar { background: var(--navy); color: #fff; text-align: center; padding: 8px 16px; font-size: 14px; }