/* ===== 博欣软件官网 · 支持昼夜主题 ===== */

/* ---- 浅色主题（默认） ---- */
:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --bg: #ffffff;
    --bg-soft: #f6f8fa;
    --card: #ffffff;
    --head: #0b1220;
    --text: #374151;
    --muted: #6b7280;
    --border: #e5e7eb;
    --hero-bg: #0b1220;
    --hero-head: #ffffff;
    --hero-text: #94a3b8;
    --footer-bg: #0b1220;
    --footer-text: #94a3b8;
    --footer-border: rgba(148,163,184,0.2);
    --card-shadow: 0 8px 24px rgba(15,23,42,0.06);
}

/* ---- 深色主题 ---- */
[data-theme="dark"] {
    --bg: #0b1220;
    --bg-soft: #101a2e;
    --card: #131d33;
    --head: #f1f5f9;
    --text: #c3cdde;
    --muted: #8b98ad;
    --border: #22304a;
    --hero-bg: #080d18;
    --hero-head: #ffffff;
    --hero-text: #94a3b8;
    --footer-bg: #080d18;
    --footer-text: #8b98ad;
    --footer-border: rgba(148,163,184,0.15);
    --card-shadow: 0 8px 24px rgba(0,0,0,0.35);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    color: var(--text); background: var(--bg); line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { display: block; max-width: 100%; }
h1, h2, h3, h4 { color: var(--head); line-height: 1.35; }

/* ===== 导航 ===== */
.nav { position: sticky; top: 0; z-index: 50; background: var(--card);
    border-bottom: 1px solid var(--border); }
.nav-inner { max-width: 1200px; margin: 0 auto; padding: 0 24px;
    height: 64px; display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 700;
    font-size: 17px; color: var(--head); white-space: nowrap; }
.logo img { width: 32px; height: 32px; object-fit: contain; }
.menu { display: flex; gap: 4px; align-items: center; }
.menu a { display: block; padding: 8px 14px; font-size: 14.5px; color: var(--text);
    border-radius: 6px; }
.menu a:hover, .menu a.active { color: var(--primary); background: var(--bg-soft); }
.nav-cta { color: #fff !important; background: var(--primary) !important; }
.nav-cta:hover { background: var(--primary-dark) !important; color: #fff !important; }
.nav-right { display: flex; align-items: center; gap: 8px; }
.nav-switch { display: flex; gap: 6px; }
.sw-btn { height: 34px; min-width: 34px; padding: 0 10px; border-radius: 6px;
    border: 1px solid var(--border); background: var(--card); color: var(--text);
    font-size: 13px; cursor: pointer; }
.sw-btn:hover { border-color: var(--primary); color: var(--primary); }
.menu-toggle { display: none; font-size: 14px; color: var(--text); background: none;
    border: 1px solid var(--border); border-radius: 6px; padding: 6px 12px; cursor: pointer; }

/* ===== Hero（深色） ===== */
.hero { position: relative; background: var(--hero-bg);
    border-bottom: 1px solid var(--border); }
.hero-inner { max-width: 1200px; margin: 0 auto; padding: 96px 24px 88px;
    display: grid; grid-template-columns: 1.05fr 1fr; gap: 64px; align-items: center; }
.hero-tag { display: inline-block; padding: 4px 12px; margin-bottom: 20px;
    border: 1px solid rgba(96,140,255,0.35); border-radius: 4px;
    font-size: 13px; color: #7da2ff; }
.hero-title { font-size: 42px; font-weight: 700; letter-spacing: -0.01em;
    color: var(--hero-head); margin-bottom: 18px; }
.hero-sub { font-size: 16.5px; color: var(--hero-text); margin-bottom: 34px; max-width: 500px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 11px 26px;
    font-size: 15px; font-weight: 600; border-radius: 6px; transition: background .15s, border-color .15s; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-ghost { background: transparent; border: 1px solid rgba(255,255,255,0.25); color: #e5e7eb; }
.btn-ghost:hover { border-color: #fff; color: #fff; }

/* Hero 右侧：轮播展示（白底卡片，完整显示不裁切） */
.hero-banner { background: #fff; border-radius: 10px; overflow: hidden;
    box-shadow: 0 24px 64px rgba(0,0,0,0.35); }
.hb-media { position: relative; aspect-ratio: 16 / 9; background: #f8fafc; }
.hb-img { position: absolute; inset: 0; width: 100%; height: 100%;
    object-fit: contain; padding: 12px; opacity: 0; transition: opacity .6s ease; }
.hb-img.active { opacity: 1; }
.hb-empty { position: absolute; inset: 0; display: flex; align-items: center;
    justify-content: center; color: var(--muted); font-size: 14px; }
.hero-dots { position: absolute; bottom: 12px; right: 14px; display: flex; gap: 7px; z-index: 2; }
.hero-dot { width: 8px; height: 8px; border-radius: 50%; border: none; padding: 0;
    background: rgba(15,23,42,0.22); cursor: pointer; transition: background .2s; }
.hero-dot.active { background: var(--primary); }
.hb-info { display: flex; align-items: center; justify-content: space-between;
    gap: 12px; padding: 13px 18px; border-top: 1px solid #e5e7eb; }
.hb-info b { font-size: 15px; color: #0b1220; }
.hb-info span { font-size: 13px; color: #6b7280; text-align: right; }

/* ===== 数据条 ===== */
.stats-bar { border-bottom: 1px solid var(--border); background: var(--bg); }
.stats-grid { max-width: 1200px; margin: 0 auto; padding: 40px 24px;
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.stat-item { text-align: center; padding: 0 12px; }
.stat-item .v { font-size: 30px; font-weight: 700; color: var(--head); }
.stat-item .l { font-size: 13.5px; color: var(--muted); margin-top: 4px; }

/* ===== 区块通用 ===== */
.section { padding: 88px 24px; border-bottom: 1px solid var(--border); }
.section-alt { background: var(--bg-soft); }
.section-inner { max-width: 1200px; margin: 0 auto; }
.section-head { margin-bottom: 48px; }
.section-head h2 { font-size: 30px; font-weight: 700; margin-bottom: 10px; }
.section-head p { color: var(--muted); font-size: 15.5px; max-width: 640px; }
.section-head.center { text-align: center; }
.section-head.center p { margin: 0 auto; }

/* ===== 产品 ===== */
.product-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.product-card { display: flex; gap: 18px; align-items: flex-start;
    background: var(--card); border: 1px solid var(--border); border-radius: 10px;
    padding: 24px; transition: border-color .15s, box-shadow .15s; }
.product-card:hover { border-color: var(--primary); box-shadow: var(--card-shadow); }
.p-badge { flex: none; width: 48px; height: 48px; border-radius: 10px;
    background: #eff4ff; color: var(--primary); font-size: 20px; font-weight: 700;
    display: flex; align-items: center; justify-content: center; }
[data-theme="dark"] .p-badge { background: rgba(37,99,235,0.18); }
.p-body { flex: 1; min-width: 0; }
.p-name { display: flex; align-items: center; justify-content: space-between;
    font-size: 17px; font-weight: 700; color: var(--head); margin-bottom: 2px; }
.p-name .go { color: var(--primary); font-size: 13.5px; font-weight: 600; white-space: nowrap; }
.p-host { font-size: 12.5px; color: var(--muted); margin-bottom: 10px; }
.p-body p { font-size: 14px; color: var(--text); }

/* ===== 服务 ===== */
.service-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.svc-card { background: var(--card); border: 1px solid var(--border); border-radius: 10px;
    padding: 26px 22px; transition: border-color .15s; }
.svc-card:hover { border-color: var(--primary); }
.svc-card .no { font-size: 13px; font-weight: 700; color: var(--primary); margin-bottom: 16px; }
.svc-card h3 { font-size: 16.5px; font-weight: 700; margin-bottom: 6px; }
.svc-card .sub { font-size: 13px; color: var(--muted); margin-bottom: 10px; }
.svc-card p { font-size: 13.5px; color: var(--text); }

/* ===== 案例 ===== */
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.case-card { display: block; background: var(--card); border: 1px solid var(--border);
    border-radius: 10px; overflow: hidden; transition: border-color .15s, box-shadow .15s; }
.case-card:hover { border-color: var(--primary); box-shadow: var(--card-shadow); }
.case-cover { aspect-ratio: 16 / 10; background: var(--bg-soft) center / contain no-repeat;
    position: relative; }
.case-cover .tag { position: absolute; top: 10px; left: 10px; padding: 2px 10px;
    background: rgba(11,18,32,0.78); color: #fff; font-size: 12px; border-radius: 4px; }
.case-body { padding: 18px 20px 20px; border-top: 1px solid var(--border); }
.case-body h3 { font-size: 16px; font-weight: 700; margin-bottom: 6px; }
.case-body p { font-size: 13.5px; color: var(--muted); display: -webkit-box;
    -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.case-meta { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 12px; }
.case-meta span { padding: 2px 10px; background: var(--bg-soft); color: var(--muted);
    font-size: 12px; border-radius: 4px; }
.cases-more { text-align: center; margin-top: 36px; }

/* ===== 关于 ===== */
.about-grid { display: grid; grid-template-columns: 1fr 1.6fr; gap: 56px; align-items: start; }
.about-grid h2 { font-size: 30px; font-weight: 700; margin-bottom: 16px; }
.about-loc { color: var(--muted); font-size: 15px; }
.about-loc b { display: block; color: var(--head); margin-bottom: 4px; }
.about-text p { font-size: 15.5px; color: var(--text); margin-bottom: 16px; }
.about-facts { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 28px; }
.about-facts .f { border: 1px solid var(--border); border-radius: 10px; padding: 16px 18px;
    background: var(--card); }
.about-facts .f b { display: block; color: var(--head); font-size: 15px; }
.about-facts .f span { font-size: 13px; color: var(--muted); }

/* ===== 联系 ===== */
.contact-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 56px; align-items: start; }
.contact-grid h2 { font-size: 30px; font-weight: 700; margin-bottom: 12px; }
.contact-list { margin-top: 28px; display: grid; gap: 18px; }
.contact-list .lbl { font-size: 12.5px; color: var(--muted); }
.contact-list .val { font-size: 15.5px; color: var(--head); font-weight: 600; }
.contact-list .val a:hover { color: var(--primary); }
.contact-form { background: var(--card); border: 1px solid var(--border); border-radius: 10px;
    padding: 26px; display: grid; gap: 14px; }
.contact-form .row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.contact-form input, .contact-form textarea {
    width: 100%; padding: 11px 14px; border: 1px solid var(--border);
    border-radius: 6px; font-size: 14px; font-family: inherit; color: var(--text);
    background: var(--bg); outline: none; resize: vertical; }
.contact-form input:focus, .contact-form textarea:focus { border-color: var(--primary); }
.contact-form button { padding: 12px; background: var(--primary); color: #fff;
    border: none; border-radius: 6px; font-size: 15px; font-weight: 600; cursor: pointer; }
.contact-form button:hover { background: var(--primary-dark); }

/* ===== Footer ===== */
.footer { background: var(--footer-bg); color: var(--footer-text); padding: 56px 24px 0; }
.footer-inner { max-width: 1200px; margin: 0 auto;
    display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; padding-bottom: 44px; }
.footer h4 { color: #fff; font-size: 14.5px; margin-bottom: 16px; font-weight: 600; }
.footer a { display: block; font-size: 13.5px; color: var(--footer-text); padding: 4px 0; }
.footer a:hover { color: #fff; }
.footer .logo { color: #fff; }
.footer .desc { font-size: 13.5px; line-height: 1.8; max-width: 320px; margin-top: 12px; }
.footer-bottom { max-width: 1200px; margin: 0 auto; padding: 18px 0;
    border-top: 1px solid var(--footer-border);
    display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px;
    font-size: 13px; }
.footer-bottom a { display: inline; color: var(--footer-text); }
.footer-bottom a:hover { color: #fff; }