/* PhysStar.ai — Proginn Style */
:root {
  --blue: #4285F4;
  --blue-dark: #3367D6;
  --orange: #FF6B2B;
  --orange-dark: #E55A1E;
  --green: #34A853;
  --bg: #FFFFFF;
  --bg-light: #F5F7FA;
  --bg-section: #F0F4FF;
  --text: #1A1A2E;
  --text-secondary: #5F6368;
  --text-muted: #9AA0A6;
  --border: #E8EAED;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.10);
  --radius: 8px;
  --radius-lg: 12px;
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
}

* { margin:0; padding:0; box-sizing:border-box; }
/* 全局隐藏页面滚动条，保留滚动功能，兼容 Chrome/Edge/Firefox/Safari */
html { scroll-behavior:smooth; scrollbar-width:none; -ms-overflow-style:none; }
html::-webkit-scrollbar { width:0; display:none; }
body { font-family:var(--font); color:var(--text); background:var(--bg); line-height:1.6; min-width:1200px; }
a { text-decoration:none; color:inherit; }

/* Header */
.header { position:fixed; top:0; left:0; right:0; background:#fff; z-index:100; border-bottom:1px solid var(--border); height:64px; }
.header .container { display:flex; align-items:center; justify-content:space-between; height:100%; }

.header-actions { display:flex; align-items:center; gap:8px; }

.container { max-width:1200px; margin:0 auto; padding:0 24px; }

.logo { display:flex; align-items:center; font-size:20px; font-weight:700; color:var(--text); }
.logo-img { height:46px; width:auto; display:block; }

.nav { display:flex; gap:35px; flex-wrap:nowrap; }
.nav a { font-size:14px; color:var(--text-secondary); font-weight:500; transition:color .2s; white-space:nowrap; }
.nav a:hover { color:var(--blue); }
.header-actions .nav-item-dropdown > a { font-size:14px; color:var(--text-secondary); font-weight:500; white-space:nowrap; }
.header-actions .nav-item-dropdown:hover > a { color:var(--blue); }
.header-actions .nav-item-dropdown:hover > a .nav-arrow { color:var(--text-secondary); }

.btn { display:inline-flex; align-items:center; justify-content:center; height:40px; padding:0 24px; border-radius:6px; font-size:14px; font-weight:600; cursor:pointer; border:none; transition:all .2s; font-family:inherit; }
.btn-primary { background:var(--blue); color:#fff; }
.btn-primary:hover { background:var(--blue-dark); transform:translateY(-1px); box-shadow:0 4px 12px rgba(66,133,244,.3); }
.btn-orange { background:var(--orange); color:#fff; }
.btn-orange:hover { background:var(--orange-dark); transform:translateY(-1px); box-shadow:0 4px 12px rgba(255,107,43,.3); }
.btn-outline { background:#fff; color:var(--blue); border:1.5px solid var(--blue); }
.btn-outline:hover { background:var(--bg-section); }
.btn-lg { height:48px; padding:0 32px; font-size:16px; border-radius:8px; }
.btn-sm { height:32px; padding:0 16px; font-size:13px; }

/* Lang Switch */
.lang-switch { font-size:13px; color:var(--text-muted); cursor:pointer; user-select:none; white-space:nowrap; margin-left:8px; }
.lang-switch .lang-active { color:var(--blue); font-weight:700; }
.lang-switch .lang-inactive { color:var(--text-muted); cursor:pointer; }
.lang-switch .lang-inactive:hover { color:var(--blue); }
/* 多语言下拉（复用 nav-item-dropdown 样式，视觉与「系统登录」一致） */
.lang-dropdown > a { display:flex; align-items:center; gap:4px; font-size:14px; color:var(--text-secondary); font-weight:500; white-space:nowrap; cursor:pointer; }
.lang-dropdown:hover > a { color:var(--blue); }
.lang-dropdown:hover > a .nav-arrow { color:var(--text-secondary); }
.lang-dropdown .nav-dropdown-menu { min-width:120px; }
.lang-dropdown .nav-dropdown-menu .lang-opt.active { color:var(--blue); font-weight:700; background:var(--bg-light); }
.lang-dropdown.open .nav-dropdown-menu { opacity:1; visibility:visible; }
.lang-dropdown.open .nav-arrow { transform:rotate(180deg); }


/* Sections */
.section { padding:80px 0; }
.section-alt { background:var(--bg-light); }

.section-header { text-align:center; margin-bottom:48px; }
.section-label { display:inline-block; background:rgba(66,133,244,.08); color:var(--blue); font-size:13px; font-weight:600; padding:4px 14px; border-radius:20px; margin-bottom:12px; }
.section-header h2 { font-size:32px; font-weight:700; margin-bottom:8px; color:var(--text); }
.section-header p { font-size:16px; color:var(--text-secondary); }

/* Hero */
.hero { padding:160px 0 110px; position:relative; overflow:hidden; }
.hero-video { position:absolute; top:0; left:0; width:100%; height:100%; object-fit:cover; z-index:0; }
.hero-overlay { position:absolute; top:0; left:0; width:100%; height:100%; background:linear-gradient(135deg, rgba(15,23,42,.75) 0%, rgba(15,23,42,.35) 100%); z-index:1; }
.hero .container { display:flex; align-items:center; gap:80px; position:relative; z-index:2; }
.hero-text { flex:1; }
.hero-badge { display:inline-flex; align-items:center; gap:6px; background:rgba(255,255,255,.15); border:1px solid rgba(255,255,255,.2); padding:6px 16px; border-radius:20px; font-size:13px; color:rgba(255,255,255,.85); margin-bottom:24px; }
.pulse { width:8px; height:8px; background:var(--green); border-radius:50%; display:inline-block; animation:pulse 2s infinite; }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:.4} }
.hero-text h1 { font-size:44px; font-weight:800; line-height:1.25; margin-bottom:16px; color:#fff; }
.hero-text h1 .gradient { background:linear-gradient(135deg, #90CAF9, #FF8A65); -webkit-background-clip:text; -webkit-text-fill-color:transparent; }
.hero-text p { font-size:16px; color:rgba(255,255,255,.8); line-height:1.8; margin-bottom:32px; max-width:520px; }
.hero-btns { display:flex; gap:12px; }

.hero-visual { flex:1; display:flex; align-items:center; justify-content:center; position:relative; }
.hero-glow { position:absolute; width:320px; height:320px; background:radial-gradient(circle, rgba(66,133,244,.12), transparent 70%); border-radius:50%; }
.platform-preview { display:grid; grid-template-columns:1fr 1fr; gap:16px; position:relative; z-index:1; }
.stat-card { background:#fff; border-radius:var(--radius); padding:24px; text-align:center; box-shadow:var(--shadow-sm); border:1px solid var(--border); }
.stat-card .num { font-size:28px; font-weight:800; color:var(--blue); }
.stat-card .label { font-size:13px; color:var(--text-muted); margin-top:4px; }

/* Feature Cards */
.features-grid { display:grid; grid-template-columns:repeat(3, 1fr); gap:20px; }
.feature-card { background:#fff; border-radius:var(--radius); padding:28px 24px; box-shadow:var(--shadow-sm); border:1px solid var(--border); transition:transform .2s, box-shadow .2s; position:relative; overflow:hidden; backface-visibility:hidden; -webkit-backface-visibility:hidden; }
.feature-card:hover { transform:translateY(-2px); box-shadow:var(--shadow-md); }
.feature-icon { margin-bottom:16px; }
.feature-card h3 { font-size:17px; font-weight:700; margin-bottom:8px; }
.feature-card p { font-size:14px; color:var(--text-secondary); line-height:1.6; }
/* Feature Card 背景图 */
.fc-home { background-image:url(../images/home.png); }
.fc-factory { background-image:url(../images/factory.png); }
.fc-chaoshi { background-image:url(../images/chaoshi.png); }
.fc-huwai { background-image:url(../images/huwai.png); }
.fc-dmt { background-image:url(../images/dmt.png); }
.fc-zhijian { background-image:url(../images/zhijian.png); }
.fc-home, .fc-factory, .fc-chaoshi, .fc-huwai, .fc-dmt, .fc-zhijian {
  background-size:contain; background-position:center; background-repeat:no-repeat;
  color:#fff;
}
.fc-home::before, .fc-factory::before, .fc-chaoshi::before,
.fc-huwai::before, .fc-dmt::before, .fc-zhijian::before {
  content:''; position:absolute; inset:0;
  background:rgba(0,0,0,0.5);
  z-index:0;
}
.fc-home > *, .fc-factory > *, .fc-chaoshi > *,
.fc-huwai > *, .fc-dmt > *, .fc-zhijian > * {
  position:relative; z-index:1;
}
.fc-home h3, .fc-factory h3, .fc-chaoshi h3,
.fc-huwai h3, .fc-dmt h3, .fc-zhijian h3 { color:#fff; }
.fc-home p, .fc-factory p, .fc-chaoshi p,
.fc-huwai p, .fc-dmt p, .fc-zhijian p { color:rgba(255,255,255,0.85); }


/* App Showcase */
.app-showcase { display:grid; grid-template-columns:1fr 1fr; gap:32px; }
.app-card { background:#fff; border-radius:var(--radius-lg); overflow:hidden; box-shadow:var(--shadow-sm); border:1px solid var(--border); }
.app-card-img { width:100%; height:220px; object-fit:cover; display:block; }
.app-card-body { padding:24px; }
.app-card-body h3 { font-size:18px; font-weight:700; margin-bottom:8px; }
.app-card-body p { font-size:14px; color:var(--text-secondary); line-height:1.7; margin-bottom:16px; }

/* Flow */
.flow { display:flex; align-items:center; justify-content:center; gap:0; }
.flow-step { background:#fff; border-radius:var(--radius); padding:24px 20px; text-align:center; box-shadow:var(--shadow-sm); border:1px solid var(--border); width:160px; }
.step-num { width:36px; height:36px; background:var(--bg-section); color:var(--blue); border-radius:50%; display:flex; align-items:center; justify-content:center; font-weight:800; font-size:16px; margin:0 auto 12px; }
.flow-step h4 { font-size:14px; font-weight:700; margin-bottom:6px; }
.flow-step p { font-size:12px; color:var(--text-secondary); line-height:1.5; }
.flow-arrow { font-size:24px; color:var(--text-muted); padding:0 8px; }

/* CTA */
.cta { padding:80px 0; background:linear-gradient(135deg, #EBF2FF 0%, #FFF4F0 100%); text-align:center; }
.cta h2 { font-size:32px; font-weight:800; margin-bottom:12px; }
.cta p { font-size:16px; color:var(--text-secondary); margin-bottom:24px; }

/* Page Banner */
.page-banner { padding:120px 0 60px; text-align:center; background:linear-gradient(180deg, #EBF2FF 0%, #FFFFFF 100%); }
.page-banner h1 { font-size:36px; font-weight:800; margin-bottom:8px; }
.page-banner p { font-size:16px; color:var(--text-secondary); }

/* Form */
.form-section { padding:40px 0 80px; }
.form-card { max-width:720px; margin:0 auto; background:#fff; border-radius:var(--radius-lg); padding:40px; box-shadow:var(--shadow-sm); border:1px solid var(--border); }
.form-card h3 { font-size:18px; font-weight:700; margin-bottom:20px; padding-bottom:12px; border-bottom:1px solid var(--border); }
.form-row { display:grid; grid-template-columns:1fr 1fr; gap:16px; }
.form-group { margin-bottom:16px; }
.form-group label { display:block; font-size:13px; font-weight:600; color:var(--text); margin-bottom:6px; }
.form-group input, .form-group select, .form-group textarea { width:100%; height:42px; border:1px solid var(--border); border-radius:6px; padding:0 12px; font-size:14px; font-family:inherit; background:#fff; transition:border .2s; }
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { outline:none; border-color:var(--blue); box-shadow:0 0 0 3px rgba(66,133,244,.1); }
.form-group textarea { height:100px; padding:12px; resize:vertical; }
.upload-box { border:1.5px dashed var(--border); border-radius:8px; padding:28px; text-align:center; color:var(--text-muted); font-size:14px; cursor:pointer; transition:all .2s; }
.upload-box:hover { border-color:var(--blue); background-color:rgba(66,133,244,.02); }
.upload-box .icon { font-size:28px; margin-bottom:8px; }

/* Partner Page — Upload Box 背景图 */
.ub-license, .ub-idcard, .ub-other {
  position:relative; overflow:hidden;
  background-size:contain; background-position:center; background-repeat:no-repeat;
}
.ub-license { background-image:url(../images/yyzz_1.png); }
.ub-idcard  { background-image:url(../images/demo-renxiang.png); }
.ub-other   { background-image:url(../images/other.png); }
.ub-license::before, .ub-idcard::before, .ub-other::before {
  content:''; position:absolute; inset:0;
  background:rgba(0,0,0,0.5);
  z-index:0;
}
.ub-license > *, .ub-idcard > *, .ub-other > * {
  position:relative; z-index:1;
  color:#fff;
}
/* Partner Upload — 选中态与文件删除 */
.upload-box.selected { border-color:var(--blue); border-style:solid; }
.file-meta { margin-top:10px; padding:8px 10px; background:rgba(255,255,255,.95); border-radius:6px; display:flex; align-items:center; justify-content:space-between; gap:8px; color:#1f2937; font-size:13px; }
.file-name { flex:1; min-width:0; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; text-align:left; }
.file-remove { flex:0 0 auto; display:inline-flex; align-items:center; gap:4px; padding:4px 10px; border:1px solid #fca5a5; background:#fef2f2; color:#dc2626; border-radius:5px; font-size:12px; cursor:pointer; transition:all .15s; }
.file-remove:hover { background:#fee2e2; border-color:#f87171; }

/* ======== Help Center ======== */
.help-search { max-width:600px; margin:0 auto 40px; position:relative; }
.help-search input { width:100%; height:48px; border:1.5px solid var(--border); border-radius:24px; padding:0 48px 0 20px; font-size:15px; font-family:inherit; background:#fff; transition:border .2s, box-shadow .2s; }
.help-search input:focus { outline:none; border-color:var(--blue); box-shadow:0 0 0 4px rgba(66,133,244,.08); }
.help-search .search-icon { position:absolute; right:16px; top:50%; transform:translateY(-50%); width:18px; height:18px; color:var(--text-muted); cursor:pointer; }
.help-search .search-icon svg { width:100%; height:100%; display:block; }

.help-tabs { display:flex; justify-content:center; gap:8px; margin-bottom:36px; flex-wrap:wrap; }
.help-tab { padding:8px 20px; border-radius:20px; font-size:14px; font-weight:500; cursor:pointer; border:1px solid var(--border); background:#fff; color:var(--text-secondary); transition:all .2s; font-family:inherit; }
.help-tab.active, .help-tab:hover { background:var(--blue); color:#fff; border-color:var(--blue); }

.help-content { max-width:800px; margin:0 auto; }
.faq-item { background:#fff; border:1px solid var(--border); border-radius:var(--radius); margin-bottom:10px; overflow:hidden; }
.faq-q { padding:16px 20px; font-size:15px; font-weight:600; cursor:pointer; display:flex; justify-content:space-between; align-items:center; user-select:none; }
.faq-q:hover { background:var(--bg-light); }
.faq-arrow { font-size:12px; color:var(--text-muted); transition:transform .2s; }
.faq-item.open .faq-arrow { transform:rotate(180deg); color:var(--blue); }
.faq-a { padding:0 20px 16px; font-size:14px; color:var(--text-secondary); line-height:1.8; display:none; }
.faq-item.open .faq-a { display:block; }

.doc-grid { display:grid; grid-template-columns:repeat(2,1fr); gap:16px; }
.doc-card { background:#fff; border:1px solid var(--border); border-radius:var(--radius); padding:20px; display:flex; gap:14px; align-items:flex-start; cursor:pointer; transition:all .2s; }
.doc-card:hover { border-color:var(--blue); box-shadow:var(--shadow-sm); }
.doc-card .doc-icon { width:44px; height:44px; border-radius:10px; display:flex; align-items:center; justify-content:center; font-size:22px; flex-shrink:0; }
.doc-card .doc-info h4 { font-size:15px; font-weight:700; margin-bottom:4px; }
.doc-card .doc-info p { font-size:13px; color:var(--text-muted); }

/* ======== Download Page ======== */
.download-hero { display:flex; align-items:center; gap:60px; padding:40px 0; }
.download-hero .dl-left { flex:1; }
.download-hero .dl-left h2 { font-size:28px; font-weight:800; margin-bottom:12px; }
.download-hero .dl-left p { font-size:15px; color:var(--text-secondary); line-height:1.8; margin-bottom:24px; }
.dl-features { display:flex; flex-direction:column; gap:12px; margin-bottom:28px; }
.dl-feature { display:flex; align-items:center; gap:10px; font-size:14px; color:var(--text-secondary); }
.dl-feature .check { color:var(--green); font-weight:700; }

.dl-right { flex:0 0 340px; display:flex; flex-direction:column; align-items:center; gap:20px; }
.qr-box { background:#fff; border:1px solid var(--border); border-radius:var(--radius-lg); padding:24px; text-align:center; box-shadow:var(--shadow-sm); }
.qr-placeholder { width:160px; height:160px; background:var(--bg-light); border:1px dashed var(--border); border-radius:8px; margin:0 auto 12px; display:flex; align-items:center; justify-content:center; font-size:80px; }
.qr-box p { font-size:13px; color:var(--text-muted); }
.dl-btns { display:flex; gap:12px; width:100%; }
.dl-btn { flex:1; display:inline-flex; align-items:center; justify-content:center; gap:8px; height:48px; border-radius:8px; font-size:15px; font-weight:700; cursor:pointer; border:none; transition:all .25s ease; font-family:inherit; white-space:nowrap; }
.dl-btn.android { background:#34A853; color:#fff; }
.dl-btn.android:hover { background:#2D8E47; transform:translateY(-1px); box-shadow:0 4px 12px rgba(52,168,83,.3); }
.dl-btn.ios { background:#1A1A2E; color:#fff; }
.dl-btn.ios:hover { background:#333; transform:translateY(-1px); box-shadow:0 4px 12px rgba(26,26,46,.3); }
.dl-btn.apk { background:linear-gradient(135deg, #2563EB, #1D4ED8); color:#fff; width:100%; height:56px; border-radius:10px; font-size:16px; box-shadow:0 4px 14px rgba(37,99,235,.25); margin-top:0; }
.dl-btn.apk:hover { background:linear-gradient(135deg, #1D4ED8, #1E40AF); transform:translateY(-2px); box-shadow:0 8px 25px rgba(37,99,235,.35); }
.dl-apk-wrap { width:100%; text-align:center; }
.dl-apk-meta { font-size:12px; color:var(--text-muted); margin-top:8px; }

.app-features-grid { display:grid; grid-template-columns:repeat(4,1fr); gap:20px; }
.app-feat-card { text-align:center; padding:28px 16px; }
.app-feat-card .afc-icon { font-size:36px; margin-bottom:12px; }
.app-feat-card .afc-icon img { width:46px; height:46px; object-fit:contain; display:block; margin:0 auto; }
.app-feat-card h4 { font-size:16px; font-weight:700; margin-bottom:6px; }
.app-feat-card p { font-size:13px; color:var(--text-muted); }

/* Footer */
.footer { background:#1A1A2E; color:#B0B8C1; padding:48px 0 24px; }
.footer-grid { display:grid; grid-template-columns:repeat(5, 1fr); gap:32px; margin-bottom:32px; }
.footer-col h4 { color:#fff; font-size:15px; margin-bottom:16px; }
.footer-col a { display:block; font-size:13px; color:#B0B8C1; padding:4px 0; transition:color .2s; }
.footer-col a:hover { color:#fff; }
.footer-bottom { border-top:1px solid rgba(255,255,255,.08); padding-top:20px; font-size:13px; text-align:center; }

/* ======== About Page ======== */
.about-vision-grid { display:grid; grid-template-columns:repeat(2, 1fr); gap:24px; }
.about-vision-card { background:#fff; border-radius:var(--radius-lg); padding:64px 40px; min-height:330px; box-shadow:var(--shadow-sm); border:1px solid var(--border); text-align:center; position:relative; overflow:hidden; backface-visibility:hidden; -webkit-backface-visibility:hidden; }
.about-vision-icon { width:52px; height:52px; background:rgba(66,133,244,.08); border-radius:12px; display:flex; align-items:center; justify-content:center; margin:0 auto 16px; }
.about-vision-card h3 { font-size:20px; font-weight:700; margin-bottom:12px; color:var(--text); }
.about-vision-card p { font-size:15px; color:var(--text-secondary); line-height:1.8; }

/* About Page — 愿景使命 背景图 */
.av-vision  { background-image:url(../images/yuanjing.jpg); }
.av-mission { background-image:url(../images/shiming.jpg); }
.av-vision, .av-mission {
  background-size:cover; background-position:center;
}
.av-vision::before, .av-mission::before {
  content:''; position:absolute; inset:0;
  background:rgba(0,0,0,0.5);
  z-index:0;
}
.av-vision > *, .av-mission > * {
  position:relative; z-index:1;
}
.av-vision h3, .av-mission h3 { color:#fff; margin-top:0; padding-top:20px; }
.av-vision p, .av-mission p { color:rgba(255,255,255,0.85); }
.av-vision .about-vision-icon, .av-mission .about-vision-icon {
  background:rgba(255,255,255,0.15);
}

.about-team-grid { display:grid; grid-template-columns:repeat(4, 1fr); gap:24px; }
.about-team-card { background:#fff; border-radius:var(--radius-lg); padding:32px 24px; box-shadow:var(--shadow-sm); border:1px solid var(--border); text-align:center; transition:transform .2s, box-shadow .2s; }
.about-team-card:hover { transform:translateY(-2px); box-shadow:var(--shadow-md); }
.about-team-avatar { width:80px; height:80px; border-radius:50%; object-fit:cover; display:block; margin:0 auto 16px; }
.about-team-card h3 { font-size:17px; font-weight:700; margin-bottom:4px; }
.about-team-role { font-size:13px; color:var(--blue); font-weight:600; margin-bottom:12px; }
.about-team-bio { font-size:13px; color:var(--text-secondary); line-height:1.7; }

.about-timeline { max-width:720px; margin:0 auto; position:relative; padding-left:40px; }
.about-timeline::before { content:''; position:absolute; left:15px; top:0; bottom:0; width:2px; background:var(--border); }
.about-timeline-item { position:relative; margin-bottom:32px; }
.about-timeline-item:last-child { margin-bottom:0; }
.about-timeline-dot { position:absolute; left:-40px; top:6px; width:12px; height:12px; border-radius:50%; background:var(--blue); border:3px solid #fff; box-shadow:0 0 0 3px var(--blue); }
.about-timeline-content { background:#fff; border-radius:var(--radius); padding:24px; box-shadow:var(--shadow-sm); border:1px solid var(--border); }
.about-timeline-time { display:inline-block; font-size:12px; font-weight:700; color:var(--blue); background:rgba(66,133,244,.08); padding:2px 10px; border-radius:12px; margin-bottom:10px; }
.about-timeline-content h4 { font-size:16px; font-weight:700; margin-bottom:6px; }
.about-timeline-content p { font-size:14px; color:var(--text-secondary); line-height:1.7; }

.about-contact { max-width:720px; margin:0 auto; display:flex; flex-direction:column; gap:20px; }
.about-contact-item { display:flex; align-items:flex-start; gap:20px; background:#fff; border-radius:var(--radius); padding:24px; box-shadow:var(--shadow-sm); border:1px solid var(--border); }
.about-contact-icon { width:48px; height:48px; border-radius:10px; display:flex; align-items:center; justify-content:center; font-size:22px; background:rgba(66,133,244,.08); flex-shrink:0; }
.about-contact-info h4 { font-size:15px; font-weight:700; margin-bottom:4px; }
.about-contact-info p { font-size:14px; color:var(--text-secondary); }
.about-contact-join { flex-direction:column; align-items:center; text-align:center; gap:16px; padding:32px; background:var(--bg-section); border:none; }
.about-contact-join p { font-size:15px; color:var(--text-secondary); }

/* ======== Navigation Dropdown ======== */
.nav-item-dropdown { position:relative; }
.nav-item-dropdown > a { display:flex; align-items:center; gap:4px; cursor:pointer; }
.nav-arrow { font-size:10px; transition:transform .2s; }
.nav-item-dropdown:hover .nav-arrow { transform:rotate(180deg); }
.nav-dropdown-menu { position:absolute; top:100%; left:50%; transform:translateX(-50%); background:#fff; border:1px solid var(--border); border-radius:var(--radius); box-shadow:var(--shadow-md); padding:8px 0; min-width:160px; opacity:0; visibility:hidden; transition:all .2s; z-index:200; margin-top:4px; }
.nav-item-dropdown:hover .nav-dropdown-menu { opacity:1; visibility:visible; }
.nav-dropdown-menu a { display:block; padding:10px 20px; font-size:14px; color:var(--text-secondary); white-space:nowrap; transition:all .15s; }
.nav-dropdown-menu a:hover { background:var(--bg-light); color:var(--blue); }

.nav-item-dropdown.open .nav-dropdown-menu { opacity:1; visibility:visible; }
.nav-item-dropdown.open .nav-arrow { transform:rotate(180deg); }
.nav-item-dropdown.dropdown-right .nav-dropdown-menu { left:auto; right:0; transform:none; }

/* ======== Tasks Page ======== */
.tasks-features-grid { display:grid; grid-template-columns:repeat(2, 1fr); gap:20px; }
.tasks-feature-card { background:#fff; border-radius:var(--radius); padding:32px 28px; box-shadow:var(--shadow-sm); border:1px solid var(--border); transition:transform .2s, box-shadow .2s; position:relative; overflow:hidden; backface-visibility:hidden; -webkit-backface-visibility:hidden; }
.tasks-feature-card:hover { transform:translateY(-2px); box-shadow:var(--shadow-md); }
.tasks-feature-icon { width:52px; height:52px; background:rgba(66,133,244,.08); border-radius:12px; display:flex; align-items:center; justify-content:center; font-size:26px; margin-bottom:18px; }
.tasks-feature-card h3 { font-size:18px; font-weight:700; margin-bottom:10px; }
.tasks-feature-card p { font-size:14px; color:var(--text-secondary); line-height:1.7; }

/* Tasks Feature Card — 背景图 */
.tfc-tasks    { background-image:url(../images/renwu.png); }
.tfc-strategy { background-image:url(../images/celv.png); }
.tfc-kanban   { background-image:url(../images/kanban.png); }
.tfc-pipeline { background-image:url(../images/guanxian.png); }
.tfc-tasks, .tfc-strategy, .tfc-kanban, .tfc-pipeline {
  background-size:cover; background-position:center; background-repeat:no-repeat;
  color:#fff;
}
.tfc-tasks::before, .tfc-strategy::before, .tfc-kanban::before, .tfc-pipeline::before {
  content:''; position:absolute; inset:0;
  background:rgba(0,0,0,0.5);
  z-index:0;
}
.tfc-tasks > *, .tfc-strategy > *, .tfc-kanban > *, .tfc-pipeline > * {
  position:relative; z-index:1;
}
.tfc-tasks h3, .tfc-strategy h3, .tfc-kanban h3, .tfc-pipeline h3 { color:#fff; }
.tfc-tasks p, .tfc-strategy p, .tfc-kanban p, .tfc-pipeline p { color:rgba(255,255,255,0.85); }
.tfc-tasks .tasks-feature-icon, .tfc-strategy .tasks-feature-icon,
.tfc-kanban .tasks-feature-icon, .tfc-pipeline .tasks-feature-icon {
  background:rgba(255,255,255,0.15);
}

.tasks-screenshots { display:grid; grid-template-columns:repeat(2, 1fr); gap:24px; }
.tasks-screenshot-card { background:#fff; border-radius:var(--radius-lg); overflow:hidden; box-shadow:var(--shadow-sm); border:1px solid var(--border); }
.tasks-screenshot-card img { width:100%; height:240px; object-fit:cover; display:block; }
.tasks-screenshot-card p { padding:16px 20px; font-size:14px; color:var(--text-secondary); text-align:center; }

.tasks-flow { display:flex; align-items:center; justify-content:center; gap:0; }
.tasks-flow-step { background:#fff; border-radius:var(--radius); padding:24px 20px; text-align:center; box-shadow:var(--shadow-sm); border:1px solid var(--border); width:180px; }
.tasks-flow-num { width:36px; height:36px; background:var(--bg-section); color:var(--blue); border-radius:50%; display:flex; align-items:center; justify-content:center; font-weight:800; font-size:16px; margin:0 auto 12px; }
.tasks-flow-step h4 { font-size:15px; font-weight:700; margin-bottom:6px; }
.tasks-flow-step p { font-size:13px; color:var(--text-secondary); line-height:1.5; }
.tasks-flow-arrow { font-size:20px; color:var(--text-muted); padding:0 6px; }

/* ======== Quality Page ======== */
.quality-features-grid { display:grid; grid-template-columns:repeat(2, 1fr); gap:20px; }
.quality-feature-card { background:#fff; border-radius:var(--radius); padding:32px 28px; box-shadow:var(--shadow-sm); border:1px solid var(--border); transition:transform .2s, box-shadow .2s; }
.quality-feature-card:hover { transform:translateY(-2px); box-shadow:var(--shadow-md); }
.quality-feature-icon { width:52px; height:52px; background:rgba(66,133,244,.08); border-radius:12px; display:flex; align-items:center; justify-content:center; font-size:26px; margin-bottom:18px; }
.quality-feature-card h3 { font-size:18px; font-weight:700; margin-bottom:10px; }
.quality-feature-card p { font-size:14px; color:var(--text-secondary); line-height:1.7; }

.quality-pipeline { display:flex; align-items:center; justify-content:center; gap:0; flex-wrap:wrap; }
.quality-pipeline-step { background:#fff; border-radius:var(--radius); padding:24px; text-align:center; box-shadow:var(--shadow-sm); border:1px solid var(--border); width:140px; min-height:150px; display:flex; flex-direction:column; align-items:center; justify-content:center; }
.quality-pipeline-icon { width:28px; height:28px; margin-bottom:10px; color:var(--text); }
.quality-pipeline-icon svg { width:100%; height:100%; display:block; }
.quality-pipeline-icon.green { color:var(--green); }
.quality-pipeline-icon.orange { color:var(--orange); }
.quality-pipeline-label { font-size:15px; font-weight:700; margin-bottom:6px; }
.quality-pipeline-desc { font-size:12px; color:var(--text-muted); line-height:1.4; }
.quality-pipeline-connector { display:flex; align-items:center; padding:0 4px; }
.quality-pipeline-line { width:28px; height:2px; background:var(--border); }
.quality-pipeline-arrow-head { width:0; height:0; border-left:6px solid var(--border); border-top:5px solid transparent; border-bottom:5px solid transparent; }
.quality-pipeline-split { display:flex; flex-direction:column; gap:12px; }
.quality-step-pass { border-color:rgba(52,168,83,.3); background:rgba(52,168,83,.03); }
.quality-step-fail { border-color:rgba(255,107,43,.3); background:rgba(255,107,43,.03); }

.quality-stats { display:grid; grid-template-columns:repeat(4, 1fr); gap:20px; }
.quality-stat-card { background:#fff; border-radius:var(--radius); padding:28px 20px; text-align:center; box-shadow:var(--shadow-sm); border:1px solid var(--border); }
.quality-stat-num { font-size:28px; font-weight:800; color:var(--blue); margin-bottom:6px; }
.quality-stat-label { font-size:13px; color:var(--text-muted); }

/* ======== Settlement Page ======== */
.settlement-features-grid { display:grid; grid-template-columns:repeat(2, 1fr); gap:20px; }
.settlement-feature-card { background:#fff; border-radius:var(--radius); padding:32px 28px; box-shadow:var(--shadow-sm); border:1px solid var(--border); transition:transform .2s, box-shadow .2s; }
.settlement-feature-card:hover { transform:translateY(-2px); box-shadow:var(--shadow-md); }
.settlement-feature-icon { width:52px; height:52px; background:rgba(66,133,244,.08); border-radius:12px; display:flex; align-items:center; justify-content:center; font-size:26px; margin-bottom:18px; }
.settlement-feature-card h3 { font-size:18px; font-weight:700; margin-bottom:10px; }
.settlement-feature-card p { font-size:14px; color:var(--text-secondary); line-height:1.7; }

.settlement-flow { max-width:1100px; margin:0 auto; display:flex; flex-direction:row; align-items:flex-start; justify-content:center; gap:0; }
.settlement-flow-step { display:flex; flex-direction:column; align-items:center; text-align:center; padding:16px 10px; position:relative; flex:1; max-width:200px; }
.settlement-flow-step:not(:last-child)::after { content:'→'; position:absolute; right:-18px; top:14px; font-size:22px; color:var(--text-muted); line-height:52px; z-index:1; }
.settlement-flow-icon { width:52px; height:52px; background:var(--bg-section); color:var(--blue); border-radius:50%; display:flex; align-items:center; justify-content:center; font-size:22px; font-weight:700; flex-shrink:0; margin-bottom:12px; }
.settlement-flow-body h4 { font-size:16px; font-weight:700; margin-bottom:6px; }
.settlement-flow-body p { font-size:13px; color:var(--text-secondary); line-height:1.5; }

.settlement-stats { display:grid; grid-template-columns:repeat(4, 1fr); gap:20px; }
.settlement-stat-card { background:#fff; border-radius:var(--radius); padding:28px 20px; text-align:center; box-shadow:var(--shadow-sm); border:1px solid var(--border); }
.settlement-stat-num { font-size:24px; font-weight:800; color:var(--blue); margin-bottom:6px; }
.settlement-stat-label { font-size:13px; color:var(--text-muted); }

/* ======== News Page ======== */
.news-grid { display:grid; grid-template-columns:repeat(3, 1fr); gap:20px; }
.news-card { background:#fff; border-radius:var(--radius); padding:28px 24px; box-shadow:var(--shadow-sm); border:1px solid var(--border); transition:transform .2s, box-shadow .2s; display:flex; flex-direction:column; cursor:pointer; }
.news-card:hover { transform:translateY(-2px); box-shadow:var(--shadow-md); }
.news-card h3 { font-size:17px; font-weight:700; margin-bottom:12px; line-height:1.5; color:var(--text); }
.news-card-date { font-size:13px; color:var(--text-muted); margin-bottom:10px; }
.news-card-summary { font-size:14px; color:var(--text-secondary); line-height:1.7; flex:1; }

.news-card-tag { display:inline-block; font-size:12px; font-weight:600; padding:3px 10px; border-radius:12px; margin-bottom:14px; width:fit-content; }
.tag-company { background:rgba(66,133,244,.08); color:var(--blue); }
.tag-product { background:rgba(52,168,83,.08); color:var(--green); }
.tag-partner { background:rgba(255,107,43,.08); color:var(--orange); }
.tag-award { background:rgba(155,89,182,.08); color:#9C27B0; }
.tag-insight { background:rgba(0,150,136,.08); color:#009688; }
.tag-conference { background:rgba(233,30,99,.08); color:#E91E63; }
.tag-other { background:rgba(158,158,158,.08); color:#757575; }

/* News Detail */
.news-detail-content { max-width:800px; margin:0 auto 40px; }
.news-detail-content p { font-size:15px; color:var(--text); line-height:2; margin-bottom:20px; text-indent:2em; }
.news-detail-tag { display:inline-block; font-size:13px; font-weight:600; padding:3px 12px; border-radius:12px; margin-right:12px; }
.news-detail-date { font-size:14px; color:var(--text-muted); }
.news-detail-back { max-width:800px; margin:0 auto; text-align:center; }
.news-detail-back .btn { min-width:160px; }

.news-not-found { text-align:center; padding:60px 20px; }
.news-not-found p { font-size:16px; color:var(--text-secondary); margin-bottom:12px; }

/* News Loading */
.news-loading { text-align:center; padding:32px 0; font-size:14px; color:var(--text-muted); display:none; }

/* News Pagination */
.news-pagination { margin-top:32px; }
.news-pagination-inner { display:flex; align-items:center; justify-content:center; gap:8px; flex-wrap:wrap; }
.news-page-btn { display:inline-flex; align-items:center; justify-content:center; min-width:40px; height:38px; padding:0 14px; border-radius:6px; font-size:14px; font-weight:500; cursor:pointer; border:1px solid var(--border); background:#fff; color:var(--text-secondary); transition:all .2s; font-family:inherit; }
.news-page-btn:hover:not(:disabled):not(.active) { border-color:var(--blue); color:var(--blue); background:rgba(66,133,244,.04); }
.news-page-btn.active { background:var(--blue); color:#fff; border-color:var(--blue); cursor:default; }
.news-page-btn:disabled { opacity:.4; cursor:not-allowed; }

/* ======== Join Us Page ======== */
.joinus-intro { text-align:center; max-width:720px; margin:0 auto 2rem; }
.joinus-intro blockquote { font-size:18px; line-height:1.8; color:var(--text); font-style:italic; border-left:4px solid var(--blue); padding-left:1.5rem; margin-bottom:1rem; text-align:left; }
.joinus-intro-author { color:var(--text-secondary); font-size:15px; text-align:right; }

.joinus-jobs { display:grid; grid-template-columns:repeat(2, 1fr); gap:1.25rem; }
.joinus-job-card { background:var(--bg); border:1px solid var(--border); border-radius:var(--radius-lg); padding:1.5rem; transition:box-shadow .2s, transform .2s; }
.joinus-job-card:hover { box-shadow:var(--shadow-md); transform:translateY(-2px); }
.joinus-job-header { display:flex; align-items:center; justify-content:space-between; margin-bottom:1rem; padding-bottom:.75rem; border-bottom:1px solid var(--border); }
.joinus-job-header h3 { font-size:16px; color:var(--text); margin:0; }
.joinus-job-tag { display:inline-block; background:var(--bg-light); color:var(--text-muted); font-size:12px; padding:2px 10px; border-radius:12px; flex-shrink:0; }
.joinus-job-body {  }
.joinus-job-section { margin-bottom:.75rem; }
.joinus-job-section:last-child { margin-bottom:0; }
.joinus-job-section h4 { font-size:14px; color:var(--text); margin-bottom:.4rem; font-weight:600; }
.joinus-job-section ul { margin:0; padding-left:1.25rem; }
.joinus-job-section li { font-size:13px; color:var(--text-secondary); line-height:1.7; margin-bottom:.15rem; }

.joinus-apply { text-align:center; max-width:600px; margin:0 auto; }
.joinus-apply h2 { font-size:24px; margin-bottom:1rem; }
.joinus-apply p { font-size:15px; color:var(--text-secondary); margin-bottom:.75rem; }
.joinus-apply-email { font-size:18px; margin:1.25rem 0; }
.joinus-apply-email a { color:var(--blue); font-weight:600; }
.joinus-apply-note { font-size:13px; color:var(--text-muted); margin-top:1rem; }

/* ======== Mobile Responsive: max-width 768px ======== */
@media (max-width: 768px) {

  /* Global */
  body { min-width:0; }
  .container { max-width:100%; padding:0 16px; }

  /* Header */
  .header { height:auto; padding:12px 0; }
  .header .container { flex-direction:column; gap:10px; }
  .nav { flex-wrap:wrap; justify-content:center; gap:12px 16px; }
  .nav a { font-size:13px; }
  .header-actions .nav-item-dropdown > a { font-size:13px; }
  .header .btn.btn-orange { font-size:12px; height:34px; padding:0 16px; }

  /* Lang Switch */
  .lang-switch { margin-left:0; }

  .logo-img { height:38px; }

  /* Buttons — touch-friendly */
  .btn { min-height:44px; }
  .btn-lg { min-height:48px; }
  .btn-sm { min-height:36px; }

  /* Sections */
  .section { padding:48px 0; }
  .section-header { margin-bottom:32px; }
  .section-header h2 { font-size:24px; }
  .section-header p { font-size:14px; }

  /* Hero */
  .hero { padding:130px 0 65px; }
  .hero .container { flex-direction:column; gap:32px; }
  .hero-text { text-align:center; }
  .hero-text h1 { font-size:28px; }
  .hero-text p { font-size:14px; max-width:100%; }
  .hero-btns { justify-content:center; flex-wrap:wrap; }
  .hero-visual { width:100%; }
  .hero-glow { width:200px; height:200px; }
  .platform-preview { grid-template-columns:1fr 1fr; gap:10px; }
  .stat-card { padding:16px 12px; }
  .stat-card .num { font-size:22px; }

  /* Features Grid */
  .features-grid { grid-template-columns:1fr; gap:12px; }
  .feature-card { padding:20px 18px; }

  /* App Showcase */
  .app-showcase { grid-template-columns:1fr; gap:20px; }
  .app-card-img { height:180px; }
  .app-card-body { padding:18px; }
  .app-card-body h3 { font-size:16px; }

  /* Flow — horizontal to vertical */
  .flow { flex-direction:column; gap:8px; }
  .flow-step { width:100%; max-width:280px; }
  .flow-arrow { transform:rotate(90deg); padding:4px 0; }

  /* CTA */
  .cta { padding:48px 0; }
  .cta h2 { font-size:24px; }
  .cta p { font-size:14px; }

  /* Page Banner */
  .page-banner { padding:100px 0 40px; }
  .page-banner h1 { font-size:26px; }

  /* Form */
  .form-card { padding:24px; }
  .form-row { grid-template-columns:1fr; gap:0; }

  /* Download Hero */
  .download-hero { flex-direction:column; gap:32px; padding:24px 0; }
  .download-hero .dl-left h2 { font-size:22px; }
  .dl-right { flex:auto; width:100%; }
  .dl-btns { flex-direction:column; }
  .dl-btn { flex:none; display:flex; width:100%; height:56px; border-radius:10px; font-size:16px; white-space:normal; box-shadow:0 4px 14px rgba(0,0,0,.15); }

  /* App Features Grid */
  .app-features-grid { grid-template-columns:repeat(2,1fr); gap:12px; }
  .app-feat-card { padding:20px 12px; }

  /* Help Center */
  .help-search { max-width:100%; }
  .help-content { max-width:100%; }
  .doc-grid { grid-template-columns:1fr; }

  /* About Page */
  .about-vision-grid { grid-template-columns:1fr; }
  .about-team-grid { grid-template-columns:repeat(2, 1fr); gap:16px; }
  .about-team-card { padding:24px 16px; }
  .about-timeline { padding-left:30px; }
  .about-timeline::before { left:11px; }
  .about-timeline-dot { left:-30px; }
  .about-timeline-content { padding:16px; }
  .about-contact-item { padding:18px; }
  .about-contact-join { padding:24px; }

  /* Nav Dropdown — mobile touch */
  .nav-item-dropdown:hover .nav-dropdown-menu { opacity:0; visibility:hidden; }
  .nav-item-dropdown.open .nav-dropdown-menu { opacity:1; visibility:visible; }

  /* Tasks Page */
  .tasks-features-grid { grid-template-columns:1fr; gap:12px; }
  .tasks-feature-card { padding:24px 20px; }
  .tasks-screenshots { grid-template-columns:1fr; gap:16px; }
  .tasks-screenshot-card img { height:180px; }
  .tasks-flow { flex-direction:column; gap:8px; }
  .tasks-flow-step { width:100%; max-width:280px; }
  .tasks-flow-arrow { transform:rotate(90deg); padding:4px 0; }

  /* Quality Page */
  .quality-features-grid { grid-template-columns:1fr; gap:12px; }
  .quality-feature-card { padding:24px 20px; }
  .quality-pipeline { flex-direction:column; gap:8px; }
  .quality-pipeline-step { width:100%; min-height:auto; padding:20px; }
  .quality-pipeline-connector { transform:rotate(90deg); padding:4px 0; }
  .quality-pipeline-split { flex-direction:row; width:100%; gap:12px; }
  .quality-pipeline-split .quality-pipeline-step { flex:1; }
  .quality-stats { grid-template-columns:repeat(2, 1fr); gap:12px; }
  .quality-stat-card { padding:20px 14px; }
  .quality-stat-num { font-size:22px; }

  /* Settlement Page */
  .settlement-features-grid { grid-template-columns:1fr; gap:12px; }
  .settlement-feature-card { padding:24px 20px; }
  .settlement-flow { max-width:100%; flex-direction:column; align-items:stretch; }
  .settlement-flow-step { flex-direction:row; align-items:flex-start; text-align:left; max-width:100%; padding:16px 12px; }
  .settlement-flow-step:not(:last-child)::after { content:''; position:absolute; left:20px; top:50px; bottom:-8px; right:auto; width:2px; background:var(--border); font-size:0; line-height:normal; }
  .settlement-flow-icon { width:40px; height:40px; font-size:18px; margin-bottom:0; margin-right:14px; flex-shrink:0; }
  .settlement-flow-body { flex:1; }
  .settlement-flow-body h4 { font-size:15px; }
  .settlement-stats { grid-template-columns:repeat(2, 1fr); gap:12px; }
  .settlement-stat-card { padding:20px 14px; }
  .settlement-stat-num { font-size:20px; }

  /* News Page */
  .news-grid { grid-template-columns:1fr; gap:14px; }
  .news-card { padding:22px 18px; }
  .news-card h3 { font-size:15px; }
  .news-card-summary { font-size:13px; }

  /* News Pagination */
  .news-pagination-inner { gap:4px; }
  .news-page-btn { min-width:34px; height:34px; padding:0 10px; font-size:13px; }

  /* News Detail */
  .news-detail-content p { font-size:14px; text-indent:1.5em; }

  /* Footer */
  .footer-grid { grid-template-columns:1fr; gap:20px; }
  .footer-col { text-align:center; }

  /* Join Us Page */
  .joinus-jobs { grid-template-columns:1fr; }
  .joinus-job-card { padding:1rem; }
  .joinus-intro blockquote { font-size:15px; }
  .joinus-apply { padding:0 1rem; }
  .joinus-job-header { flex-direction:column; align-items:flex-start; gap:.5rem; }

}