/* PDgo website · brand: single orange accent on warm neutrals */
:root{
  --o:#FF6A2C; --o-deep:#E8551B; --o-soft:#FFE6D6;
  --cream:#FFF6EE; --paper:#FBF4EC; --ink:#241A12; --ink2:#6E6057; --ink3:#9C8A7C;
  --line:#EFE3D7; --card:#FFFFFF; --radius:16px;
}
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
     color:var(--ink);background:var(--cream);line-height:1.65;-webkit-font-smoothing:antialiased;}
img{max-width:100%;display:block;}
a{color:var(--o-deep);text-decoration:none;}
a:hover{text-decoration:underline;}

.wrap{max-width:1080px;margin:0 auto;padding:0 24px;}

/* nav */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,246,238,.92);backdrop-filter:blur(12px);
     border-bottom:1px solid var(--line);}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;height:64px;}
.logo{font-size:20px;font-weight:800;color:var(--ink);text-decoration:none;}
.logo b{color:var(--o-deep);}
.nav-links{display:flex;gap:26px;align-items:center;font-size:15px;font-weight:600;}
.nav-links a{color:var(--ink2);}
.btn{display:inline-block;background:linear-gradient(180deg,#FF7C3C,#F0581C);color:#fff !important;
     font-weight:700;padding:12px 26px;border-radius:999px;text-decoration:none !important;
     box-shadow:0 6px 18px rgba(240,88,28,.28);transition:transform .15s ease;}
.btn:hover{transform:translateY(-1px);}
.btn:active{transform:scale(.98);}
.btn.big{font-size:18px;padding:16px 36px;}

/* hero */
.hero{padding:48px 0 0;}
.hero .wrap{display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:center;}
.hero h1{font-size:clamp(34px,5vw,56px);font-weight:900;line-height:1.12;letter-spacing:-.01em;}
.hero h1 em{font-style:normal;color:var(--o-deep);}
.hero .sub{margin-top:18px;font-size:19px;color:var(--ink2);max-width:32em;}
.hero .cta-row{margin-top:30px;display:flex;gap:16px;align-items:center;flex-wrap:wrap;}
.hero .note{margin-top:14px;font-size:13.5px;color:var(--ink3);}
/* 完整 iPhone,整机放进首屏,不裁切 */
.phone-col{display:block;padding:8px 0 28px;}
.phone-col:hover .phone-shot{transform:translateY(-4px);}
.phone-shot{width:min(268px,70%);height:auto;display:block;margin:0 auto;
            border-radius:40px;border:10px solid #101010;
            box-shadow:0 30px 70px rgba(40,18,4,.25);transition:transform .25s ease;}

/* App Store 官方样式黑徽章 */
.asbadge{display:inline-flex;align-items:center;gap:12px;background:#0b0b0b;
         color:#fff !important;border-radius:14px;padding:11px 22px;
         text-decoration:none !important;transition:transform .15s ease;}
.asbadge:hover{transform:translateY(-1px);}
.asbadge:active{transform:scale(.98);}
.asbadge svg{width:28px;height:28px;fill:#fff;flex:none;}
.asbadge small{display:block;font-size:11.5px;opacity:.85;line-height:1.2;letter-spacing:.01em;}
.asbadge b{display:block;font-size:21px;font-weight:700;line-height:1.15;}

/* sections */
section{padding:72px 0;}
section.alt{background:var(--paper);}
.sec-h{font-size:clamp(26px,3.4vw,38px);font-weight:850;line-height:1.2;margin-bottom:14px;}
.sec-p{color:var(--ink2);max-width:46em;margin-bottom:34px;}

/* steps */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.step{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px;}
.step .n{width:40px;height:40px;border-radius:50%;background:linear-gradient(180deg,#FF7C3C,#F0581C);
        color:#fff;font-weight:800;display:flex;align-items:center;justify-content:center;margin-bottom:14px;}
.step h3{font-size:17px;margin-bottom:6px;}
.step p{font-size:14.5px;color:var(--ink2);}

/* feature rows */
.split{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:center;}
.check{list-style:none;}
.check li{padding:9px 0 9px 32px;position:relative;color:var(--ink2);}
.check li::before{content:"";position:absolute;left:0;top:14px;width:18px;height:18px;border-radius:50%;
  background:var(--o-soft);}
.check li::after{content:"";position:absolute;left:5px;top:19px;width:8px;height:5px;
  border-left:2.5px solid var(--o-deep);border-bottom:2.5px solid var(--o-deep);transform:rotate(-45deg);}
.check li b{color:var(--ink);}

/* faq */
.faq{max-width:760px;}
.faq details{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
             padding:18px 22px;margin-bottom:12px;}
.faq summary{font-weight:700;cursor:pointer;font-size:16px;}
.faq p{margin-top:10px;color:var(--ink2);font-size:15px;}

/* article */
.article{max-width:720px;margin:0 auto;padding:56px 24px 80px;}
.article h1{font-size:clamp(30px,4vw,42px);font-weight:900;line-height:1.18;margin-bottom:10px;}
.article .meta{color:var(--ink3);font-size:14px;margin-bottom:32px;}
.article h2{font-size:24px;font-weight:800;margin:38px 0 12px;}
.article p, .article li{color:#3d332b;font-size:16.5px;margin-bottom:14px;}
.article ul, .article ol{padding-left:24px;margin-bottom:16px;}
.article table{width:100%;border-collapse:collapse;margin:18px 0 24px;font-size:15px;}
.article th,.article td{border:1px solid var(--line);padding:10px 14px;text-align:left;}
.article th{background:var(--paper);}
.callout{background:var(--o-soft);border-radius:var(--radius);padding:22px 24px;margin:28px 0;}
.callout b{color:var(--o-deep);}

/* cta band */
.cta-band{background:linear-gradient(150deg,#FF8A45,#E0500F);color:#fff;text-align:center;padding:72px 24px;}
.cta-band h2{font-size:clamp(28px,4vw,40px);font-weight:900;margin-bottom:12px;}
.cta-band p{opacity:.94;margin-bottom:28px;}
.cta-band .btn{background:#fff;color:var(--o-deep) !important;box-shadow:0 10px 26px rgba(80,25,0,.25);}

/* footer */
footer{padding:44px 0 60px;border-top:1px solid var(--line);font-size:14px;color:var(--ink3);}
footer .wrap{display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap;}
footer a{color:var(--ink2);margin-right:18px;}

/* ruler tool */
.tool{max-width:760px;margin:0 auto;padding:56px 24px 80px;}
.tool h1{font-size:clamp(30px,4vw,40px);font-weight:900;margin-bottom:10px;}
.tool .lead{color:var(--ink2);margin-bottom:30px;}
.panel{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px;margin-bottom:22px;}
.panel h2{font-size:19px;margin-bottom:12px;}
.cardbox{height:110px;background:var(--o-soft);border:2px dashed var(--o);border-radius:12px;
         display:flex;align-items:center;justify-content:center;color:var(--o-deep);font-weight:700;}
input[type=range]{width:100%;accent-color:var(--o-deep);margin:16px 0 6px;}
.ruler{position:relative;height:96px;background:#fff;border:1px solid var(--line);border-radius:8px;
       overflow:hidden;margin-top:14px;}
.ruler .t{position:absolute;top:0;width:1px;background:#8a7a6c;}
.ruler .t.mm{height:16px;}
.ruler .t.mm5{height:26px;}
.ruler .t.cm{height:38px;background:var(--ink);width:1.5px;}
.ruler .lab{position:absolute;top:44px;font-size:11px;color:var(--ink2);transform:translateX(-50%);}

.phone-sm{width:min(240px,64%);height:auto;display:block;margin:0 auto;
          border-radius:34px;border:9px solid #101010;
          box-shadow:0 24px 56px rgba(40,18,4,.22);}

@media (max-width:820px){
  .hero .wrap,.split{grid-template-columns:1fr;}
  .steps{grid-template-columns:1fr;}
  .hero{padding-top:44px;}
  .nav-links a:not(.btn){display:none;}   /* 手机上只留下载按钮 */
  .nav-links .btn{padding:10px 20px;}
  section{padding:52px 0;}
}