/* ===== 钉钉介绍与下载站 - 全局样式 ===== */
:root {
  --blue: #005EFF;
  --blue-hover: #0047CC;
  --blue-light: #E8F0FE;
  --blue-bg: #F0F5FF;
  --text: #1F2329;
  --text-secondary: #646A73;
  --text-light: #8F959E;
  --border: #E5E6EB;
  --bg: #F5F6F7;
  --white: #FFFFFF;
  --green: #00B96B;
  --orange: #FF7A00;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 2px 12px rgba(0,0,0,.08);
  --shadow-lg: 0 8px 32px rgba(0,94,255,.12);
  --font: -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  --max-width: 1200px;
  --header-h: 64px;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--font);font-size:16px;color:var(--text);background:var(--white);line-height:1.6;min-height:100vh}
a{color:var(--blue);text-decoration:none}
a:hover{color:var(--blue-hover)}
img{max-width:100%;height:auto;display:block}

/* ===== Header ===== */
.header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.92);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border)}
.header-inner{max-width:var(--max-width);margin:0 auto;padding:0 24px;display:flex;align-items:center;justify-content:space-between;height:var(--header-h)}
.logo{display:flex;align-items:center;gap:10px;font-size:20px;font-weight:700;color:var(--text)}
.logo img{width:36px;height:36px}
.nav{display:flex;gap:4px}
.nav a{display:inline-flex;align-items:center;padding:8px 18px;border-radius:8px;color:var(--text-secondary);font-size:15px;font-weight:500;transition:all .2s}
.nav a:hover,.nav a.active{color:var(--blue);background:var(--blue-bg)}

/* ===== Hero ===== */
.hero{padding:72px 24px 64px;text-align:center;background:linear-gradient(180deg,var(--blue-bg) 0%,var(--white) 100%)}
.hero-icon{margin:0 auto 24px;width:88px;height:88px}
.hero h1{font-size:clamp(28px,5vw,48px);font-weight:700;line-height:1.2;margin-bottom:16px;color:var(--text)}
.hero h1 span{color:var(--blue)}
.hero p{font-size:clamp(16px,2.5vw,20px);color:var(--text-secondary);max-width:640px;margin:0 auto 32px;line-height:1.7}
.hero-actions{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}

/* ===== Buttons ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:14px 36px;border-radius:var(--radius);font-size:17px;font-weight:600;cursor:pointer;border:none;transition:all .25s;text-align:center;white-space:nowrap}
.btn:active{transform:scale(.97)}
.btn-primary{background:var(--blue);color:#fff;box-shadow:0 4px 16px rgba(0,94,255,.3)}
.btn-primary:hover{background:var(--blue-hover);color:#fff;box-shadow:0 6px 24px rgba(0,94,255,.4)}
.btn-xl{padding:18px 56px;font-size:20px;border-radius:14px;letter-spacing:.5px}
.btn-xxl{padding:22px 72px;font-size:24px;border-radius:16px;letter-spacing:1px;box-shadow:0 8px 32px rgba(0,94,255,.35)}
.btn-outline{background:var(--white);color:var(--blue);border:2px solid var(--blue)}
.btn-outline:hover{background:var(--blue);color:#fff}

/* ===== Sections ===== */
.section{padding:64px 24px}
.section-gray{background:var(--bg)}
.section-inner{max-width:var(--max-width);margin:0 auto}
.section-title{text-align:center;margin-bottom:48px}
.section-title h2{font-size:clamp(24px,4vw,36px);font-weight:700;margin-bottom:12px}
.section-title p{font-size:17px;color:var(--text-secondary)}

/* ===== Feature Cards ===== */
.features{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:24px}
.feature-card{background:var(--white);border-radius:var(--radius);padding:32px 24px;border:1px solid var(--border);transition:all .25s}
.feature-card:hover{box-shadow:var(--shadow-lg);border-color:var(--blue);transform:translateY(-2px)}
.feature-icon{width:48px;height:48px;border-radius:var(--radius-sm);background:var(--blue-bg);display:flex;align-items:center;justify-content:center;font-size:24px;margin-bottom:20px;color:var(--blue)}
.feature-card h3{font-size:18px;font-weight:600;margin-bottom:8px}
.feature-card p{font-size:15px;color:var(--text-secondary);line-height:1.7}

/* ===== Stats ===== */
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:24px}
.stat-item{text-align:center;padding:24px}
.stat-number{font-size:clamp(32px,5vw,48px);font-weight:800;color:var(--blue);line-height:1}
.stat-label{font-size:15px;color:var(--text-secondary);margin-top:8px}

/* ===== Download Cards ===== */
.download-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px}
.download-card{background:var(--white);border-radius:var(--radius);padding:32px 24px;border:1px solid var(--border);text-align:center;transition:all .25s}
.download-card:hover{border-color:var(--blue);box-shadow:var(--shadow)}
.download-card h3{font-size:20px;font-weight:600;margin:16px 0 8px}
.download-card p{font-size:14px;color:var(--text-secondary);margin-bottom:20px}
.download-card .btn{width:100%}
.platform-icon{font-size:40px}

/* ===== FAQ ===== */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{border:1px solid var(--border);border-radius:var(--radius);margin-bottom:12px;overflow:hidden}
.faq-q{display:flex;align-items:center;justify-content:space-between;padding:18px 24px;font-size:17px;font-weight:600;cursor:pointer;background:var(--white);border:none;width:100%;text-align:left;color:var(--text);transition:all .2s}
.faq-q:hover{color:var(--blue)}
.faq-q::after{content:"+";font-size:22px;color:var(--text-light);transition:transform .3s}
.faq-a{font-size:15px;color:var(--text-secondary);line-height:1.8;padding:0 24px 20px;display:none}
.faq-item.open .faq-q{color:var(--blue)}
.faq-item.open .faq-q::after{content:"−";color:var(--blue)}
.faq-item.open .faq-a{display:block}

/* ===== Breadcrumb ===== */
.breadcrumb{padding:16px 24px;font-size:14px;color:var(--text-light)}
.breadcrumb-inner{max-width:var(--max-width);margin:0 auto}
.breadcrumb a{color:var(--text-light)}
.breadcrumb a:hover{color:var(--blue)}
.breadcrumb span{color:var(--text)}

/* ===== Page Hero ===== */
.page-hero{padding:48px 24px;text-align:center;background:var(--blue-bg)}
.page-hero h1{font-size:clamp(26px,4vw,40px);font-weight:700;margin-bottom:12px}
.page-hero p{font-size:17px;color:var(--text-secondary);max-width:600px;margin:0 auto}

/* ===== Details ===== */
.detail-block{margin-bottom:48px}
.detail-block h2{font-size:26px;font-weight:700;margin-bottom:12px;padding-bottom:12px;border-bottom:2px solid var(--blue)}
.detail-block h3{font-size:20px;font-weight:600;margin:24px 0 10px;color:var(--text)}
.detail-block p{font-size:16px;color:var(--text-secondary);line-height:1.8;margin-bottom:12px}
.detail-block ul,.detail-block ol{padding-left:24px;margin-bottom:16px}
.detail-block li{font-size:15px;color:var(--text-secondary);line-height:2}
.highlight-box{background:var(--blue-bg);border-radius:var(--radius);padding:24px 28px;margin:20px 0;border-left:4px solid var(--blue)}
.highlight-box p{color:var(--text);margin:0}

/* ===== Steps ===== */
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:24px;margin:32px 0}
.step-item{text-align:center;padding:24px;position:relative}
.step-num{width:44px;height:44px;border-radius:50%;background:var(--blue);color:#fff;font-size:20px;font-weight:700;display:flex;align-items:center;justify-content:center;margin:0 auto 16px}
.step-item h4{font-size:17px;font-weight:600;margin-bottom:6px}
.step-item p{font-size:14px;color:var(--text-secondary)}

/* ===== Table ===== */
.table-wrapper{overflow-x:auto;margin:24px 0}
table{width:100%;border-collapse:collapse;font-size:15px}
thead{background:var(--blue-bg)}
th{padding:14px 16px;text-align:left;font-weight:600;color:var(--blue);white-space:nowrap}
td{padding:14px 16px;border-bottom:1px solid var(--border);color:var(--text-secondary)}
tbody tr:hover{background:var(--bg)}
.tag{display:inline-block;padding:2px 10px;border-radius:20px;font-size:12px;font-weight:600}
.tag-new{background:#E8F8EF;color:var(--green)}
.tag-hot{background:#FFF1E6;color:var(--orange)}

/* ===== CTA Banner ===== */
.cta-banner{background:linear-gradient(135deg,var(--blue),#003DBF);padding:64px 24px;text-align:center;color:#fff;border-radius:var(--radius);margin-top:48px}
.cta-banner h2{font-size:clamp(22px,3.5vw,32px);font-weight:700;margin-bottom:12px;color:#fff}
.cta-banner p{font-size:17px;opacity:.9;margin-bottom:28px}
.cta-banner .btn-primary{background:#fff;color:var(--blue);box-shadow:0 4px 16px rgba(0,0,0,.2)}
.cta-banner .btn-primary:hover{background:#f0f0f0;color:var(--blue)}

/* ===== Footer ===== */
.footer{background:var(--text);color:rgba(255,255,255,.6);padding:40px 24px 24px;font-size:14px}
.footer-inner{max-width:var(--max-width);margin:0 auto}
.footer-links{display:flex;gap:24px;flex-wrap:wrap;margin-bottom:20px}
.footer-links a{color:rgba(255,255,255,.7)}
.footer-links a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding-top:20px;line-height:1.8}

/* ===== Responsive ===== */
@media(max-width:768px){
  .header-inner{padding:0 16px}
  .nav a{padding:6px 12px;font-size:14px}
  .logo{font-size:17px}
  .logo img{width:30px;height:30px}
  .hero{padding:48px 16px 40px}
  .hero-icon{width:64px;height:64px}
  .btn-xl,.btn-xxl{padding:16px 40px;font-size:18px}
  .section{padding:40px 16px}
  .feature-card{padding:24px 18px}
  .cta-banner{padding:40px 20px}
  .download-grid{grid-template-columns:1fr}
  .features{grid-template-columns:1fr}
  .stats{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:1fr}
  .breadcrumb{padding:12px 16px}
}
@media(max-width:480px){
  .nav{gap:2px}
  .nav a{padding:6px 10px;font-size:13px}
  .hero h1{font-size:24px}
  .btn-xxl{padding:18px 40px;font-size:20px}
}