/* ============================================================
   HACP 产品官网 · 共享设计系统
   PubCIT Academic 浅色规范
   ============================================================ */
:root{
  --primary:#0B1F33;--primary-container:#1A3348;--secondary:#5A6B7A;
  --tertiary:#0E7C86;--tertiary-container:#0A5F67;--on-tertiary:#F4FBFC;
  --neutral:#F2F5F8;--surface:#FFFFFF;--on-surface:#0B1F33;--outline:#C5CED6;
  --accent-soft:#E6F4F5;--shadow:0 8px 28px rgba(11,31,51,.08);
  --serif:'Source Serif 4',Georgia,'Songti SC',serif;
  --sans:'Source Sans 3',-apple-system,'PingFang SC','Microsoft YaHei',sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--neutral);color:var(--on-surface);font-family:var(--sans);line-height:1.7;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:1120px;margin:0 auto;padding:0 24px}

/* ---------- 按钮 ---------- */
.btn{display:inline-flex;align-items:center;gap:8px;background:var(--tertiary);color:var(--on-tertiary);padding:11px 26px;border-radius:8px;font-weight:600;font-size:15px;transition:.15s;border:none;cursor:pointer}
.btn:hover{background:var(--tertiary-container)}
.btn.outline{background:transparent;border:1px solid var(--outline);color:var(--primary)}
.btn.outline:hover{background:var(--neutral);border-color:var(--secondary)}
.btn.primary-dark{background:var(--primary);color:#fff}
.btn.primary-dark:hover{background:var(--primary-container)}
.btn.lg{padding:14px 34px;font-size:16px}

/* ---------- 顶部导航 ---------- */
.nav{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.94);backdrop-filter:blur(10px);border-bottom:1px solid var(--outline)}
.nav-inner{display:flex;justify-content:space-between;align-items:center;padding:14px 0;height:64px}
.brand{display:flex;align-items:center;gap:12px}
.brand .logo{width:42px;height:42px;border-radius:10px;background:linear-gradient(135deg,var(--primary),var(--tertiary));color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:15px;letter-spacing:.5px;flex-shrink:0}
.brand .name{font-size:17px;font-weight:700;line-height:1.2}
.brand .name small{display:block;color:var(--secondary);font-size:11px;font-weight:400}
.nav-links{display:flex;align-items:center;gap:28px}
.nav-links a{font-size:15px;font-weight:500;color:var(--secondary);transition:.15s;position:relative;padding:4px 0}
.nav-links a:hover{color:var(--primary)}
.nav-links a.active{color:var(--primary);font-weight:700}
.nav-links a.active::after{content:'';position:absolute;left:0;right:0;bottom:-2px;height:2px;background:var(--tertiary);border-radius:2px}
.nav-cta{display:flex;align-items:center;gap:14px}
/* 移动端汉堡 */
.nav-toggle{display:none;background:none;border:none;font-size:24px;color:var(--primary);cursor:pointer;padding:4px}
#nav-check{display:none}

/* ---------- Hero ---------- */
.hero{position:relative;background:linear-gradient(180deg,#FFFFFF 0%,var(--neutral) 100%);padding:88px 0 72px;overflow:hidden}
.hero::before{content:'';position:absolute;top:-120px;right:-120px;width:480px;height:480px;background:radial-gradient(circle,rgba(14,124,134,.12),transparent 70%);pointer-events:none}
.hero::after{content:'';position:absolute;bottom:-160px;left:-120px;width:420px;height:420px;background:radial-gradient(circle,rgba(11,31,51,.08),transparent 70%);pointer-events:none}
.hero-inner{position:relative;text-align:center;max-width:820px;margin:0 auto}
.hero .badge{display:inline-flex;align-items:center;gap:6px;background:var(--accent-soft);color:var(--tertiary-container);font-size:13px;font-weight:700;padding:7px 16px;border-radius:999px;margin-bottom:24px}
.hero h1{font-family:var(--serif);font-size:clamp(34px,5.4vw,56px);margin:0 0 20px;font-weight:700;letter-spacing:.5px;line-height:1.15}
.hero h1 .hl{color:var(--tertiary)}
.hero .sub{color:var(--secondary);font-size:18px;margin:0 auto 36px;max-width:640px;line-height:1.8}
.hero .btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.hero .note{margin-top:20px;color:var(--secondary);font-size:13px}

/* ---------- 数据统计条 ---------- */
.statsbar{background:var(--primary);color:#fff;padding:44px 0}
.statsbar .grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;text-align:center}
.stat .num{font-family:var(--serif);font-size:40px;font-weight:700;color:#fff;line-height:1.1}
.stat .num span{color:#7ED5DB}
.stat .label{font-size:13px;color:rgba(255,255,255,.75);margin-top:6px}

/* ---------- 通用 section ---------- */
.sec{padding:76px 0}
.sec.alt{background:var(--surface);border-top:1px solid var(--outline);border-bottom:1px solid var(--outline)}
.sec-head{text-align:center;margin-bottom:48px}
.sec-head .eyebrow{display:inline-block;color:var(--tertiary);font-size:13px;font-weight:700;letter-spacing:2px;text-transform:uppercase;margin-bottom:10px}
.sec-head h2{font-family:var(--serif);font-size:clamp(26px,3.6vw,38px);margin:0 0 12px;font-weight:700}
.sec-head p{color:var(--secondary);font-size:16px;margin:0 auto;max-width:600px}

/* ---------- 功能卡片网格 ---------- */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px}
.card{background:var(--surface);border:1px solid var(--outline);border-radius:16px;padding:30px 28px;transition:.18s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:var(--tertiary)}
.card .icon{width:52px;height:52px;border-radius:12px;background:var(--accent-soft);display:flex;align-items:center;justify-content:center;font-size:26px;margin-bottom:18px}
.card h3{margin:0 0 10px;font-size:18px;font-weight:700}
.card p{margin:0;color:var(--secondary);font-size:14px;line-height:1.8}
.card ul{margin:14px 0 0;padding-left:18px;color:var(--secondary);font-size:14px}
.card ul li{margin:6px 0}

/* ---------- 差异化亮点（左右图文） ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.split .text h3{font-family:var(--serif);font-size:28px;margin:0 0 16px;font-weight:700}
.split .text p{color:var(--secondary);font-size:15px;margin:0 0 14px}
.split .text .tag{display:inline-block;background:var(--accent-soft);color:var(--tertiary-container);font-size:12px;font-weight:700;padding:4px 12px;border-radius:6px;margin-bottom:14px}
.split .visual{background:var(--surface);border:1px solid var(--outline);border-radius:16px;padding:32px;box-shadow:var(--shadow)}
.split .visual .mock{font-family:var(--serif);color:var(--primary)}

/* ---------- 场景卡片 ---------- */
.scenes .card{text-align:left}
.scenes .card .icon{background:var(--neutral);border:1px solid var(--outline)}

/* ---------- CTA 区 ---------- */
.cta{background:linear-gradient(135deg,var(--primary),var(--primary-container));color:#fff;border-radius:20px;padding:56px 48px;text-align:center}
.cta h2{font-family:var(--serif);font-size:clamp(24px,3.4vw,34px);margin:0 0 14px;font-weight:700}
.cta p{color:rgba(255,255,255,.8);font-size:16px;margin:0 auto 28px;max-width:560px}
.cta .btn{background:#fff;color:var(--primary)}
.cta .btn:hover{background:var(--accent-soft)}

/* ---------- 面板（关于/隐私/联系） ---------- */
.panel{background:var(--surface);border:1px solid var(--outline);border-radius:16px;padding:40px 44px}
.panel h3{font-family:var(--serif);font-size:24px;margin:0 0 16px;font-weight:700}
.panel h4{font-size:16px;margin:24px 0 10px;font-weight:700;color:var(--primary)}
.panel p,.panel li{color:var(--secondary);font-size:15px;line-height:1.9}
.panel ul{padding-left:20px;margin:8px 0}
.panel .lead{font-size:16px;color:var(--on-surface)}
.contact-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px;margin-top:20px}
.contact-item{background:var(--neutral);border:1px solid var(--outline);border-radius:12px;padding:18px 20px}
.contact-item .k{font-size:12px;color:var(--secondary);font-weight:600;letter-spacing:1px;text-transform:uppercase;margin-bottom:6px}
.contact-item .v{font-size:15px;font-weight:600;color:var(--primary);word-break:break-all}

/* ---------- Footer ---------- */
.footer{background:var(--primary);color:rgba(255,255,255,.8);padding:56px 0 24px;margin-top:0}
.footer .cols{display:grid;grid-template-columns:2fr 1fr 1fr auto;gap:32px;padding-bottom:32px;border-bottom:1px solid rgba(255,255,255,.12)}
.footer .brand-name{font-family:var(--serif);font-size:20px;font-weight:700;color:#fff;margin-bottom:12px}
.footer .brand-desc{font-size:13px;line-height:1.8;color:rgba(255,255,255,.65);max-width:360px}
.footer h4{font-size:13px;font-weight:700;letter-spacing:1px;text-transform:uppercase;color:#fff;margin:0 0 14px}
.footer .col a{display:block;font-size:14px;color:rgba(255,255,255,.7);padding:5px 0;transition:.15s}
.footer .col a:hover{color:#7ED5DB}
/* 二维码（页脚「关于」左侧，紧凑） */
.footer .qr{display:flex;flex-direction:column;align-items:flex-start}
.footer .qr-title{font-size:13px;font-weight:700;letter-spacing:1px;color:#fff;margin:0 0 12px}
.footer .qr img{width:79px;height:79px;display:block;border-radius:6px;border:2px solid rgba(255,255,255,.92);background:#fff}
.footer .qr-note{font-size:11.5px;line-height:1.5;color:rgba(255,255,255,.6);margin:7px 0 0;white-space:nowrap}
.footer .bottom{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;padding-top:20px;font-size:12px;color:rgba(255,255,255,.55)}
.footer .bottom a{color:rgba(255,255,255,.7)}
.footer .bottom a:hover{color:#7ED5DB}

/* ---------- 页面标题（内页 hero） ---------- */
.pagehead{background:linear-gradient(180deg,#FFFFFF 0%,var(--neutral) 100%);padding:64px 0 48px;text-align:center;border-bottom:1px solid var(--outline)}
.pagehead h1{font-family:var(--serif);font-size:clamp(30px,4.4vw,44px);margin:0 0 14px;font-weight:700}
.pagehead p{color:var(--secondary);font-size:16px;max-width:640px;margin:0 auto}

/* ---------- 响应式 ---------- */
@media(max-width:900px){
  .split{grid-template-columns:1fr;gap:28px}
  .statsbar .grid{grid-template-columns:repeat(2,1fr)}
  .footer .cols{grid-template-columns:1fr;gap:28px}
  /* 窄屏：二维码与说明并排，占位更小 */
  .footer .qr{flex-direction:row;align-items:center;gap:12px}
  .footer .qr-title{margin:0 0 0 0;writing-mode:horizontal-tb}
  .footer .qr img{width:70px;height:70px}
  .footer .qr-note{margin:0;white-space:normal;max-width:140px}
}
@media(max-width:768px){
  .hero{padding:56px 0 48px}
  .sec{padding:52px 0}
  .panel{padding:28px 22px}
  .nav-links{position:fixed;top:64px;left:0;right:0;background:#fff;flex-direction:column;align-items:stretch;gap:0;padding:12px 24px;border-bottom:1px solid var(--outline);transform:translateY(-120%);transition:.25s;z-index:99}
  .nav-links a{padding:14px 0;border-bottom:1px solid var(--neutral)}
  .nav-toggle{display:block}
  #nav-check:checked ~ .nav-links{transform:translateY(0)}
  .nav-cta .btn{display:none}
  .cta{padding:40px 24px}
}