/* ============ Krace 官网 · 杂志风视觉系统 ============ */
:root{
  --black:#111111;
  --ink:#1A1A1A;
  --gold:#C9A96E;
  --white:#FFFFFF;
  --light:#F5F5F5;
  --line:#E8E8E8;
  --grey:#999999;
  --darkgrey:#666666;
  --teal:#7FD1C9;
  --rose:#C98A8A;
  --maxw:1120px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:'PingFang SC','Hiragino Sans GB','Microsoft YaHei',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  color:var(--black);
  background:var(--white);
  -webkit-font-smoothing:antialiased;
  line-height:1.8;
}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block}

/* 通用排版 */
.eyebrow{
  font-size:12px;letter-spacing:.35em;color:var(--grey);
  text-transform:uppercase;margin-bottom:18px;
}
.eyebrow.gold{color:var(--gold)}
h1,h2{font-weight:300;letter-spacing:.06em;line-height:1.5}
h1{font-size:clamp(28px,4.6vw,50px)}
h2{font-size:clamp(22px,3.2vw,34px)}
.rule{width:56px;height:1px;background:var(--gold);margin:26px 0}
.rule.gold{background:var(--gold)}
.lead{font-size:16px;font-weight:300;color:var(--darkgrey);line-height:2.1}
.dim{color:#9a9a9a}

/* 按钮 */
.btn{
  display:inline-block;padding:16px 38px;font-size:13px;
  letter-spacing:.28em;transition:.35s ease;cursor:pointer;
}
.btn-solid{background:var(--black);color:var(--white);border:1px solid var(--black)}
.btn-solid:hover{background:var(--gold);border-color:var(--gold);color:var(--black)}
.btn-ghost{border:1px solid var(--line);color:var(--black)}
.btn-ghost:hover{border-color:var(--gold);color:var(--gold)}
.btn-lg{padding:20px 56px;font-size:14px}

/* ============ 导航 ============ */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:50;
  background:rgba(255,255,255,.86);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid transparent;transition:.35s;
}
.nav.scrolled{border-bottom-color:var(--line)}
.nav-inner{
  max-width:var(--maxw);margin:0 auto;padding:20px 28px;
  display:flex;align-items:center;justify-content:space-between;
}
.brand{font-size:15px;letter-spacing:.5em;font-weight:300}
.nav-links{display:flex;gap:38px}
.nav-links a{font-size:13px;letter-spacing:.16em;color:var(--darkgrey);transition:.3s}
.nav-links a:hover{color:var(--gold)}

/* ============ 首屏 ============ */
.hero{max-width:var(--maxw);margin:0 auto;padding:170px 28px 110px}
.hero-inner{display:grid;grid-template-columns:1.1fr .9fr;gap:70px;align-items:center}
.hero-copy .lead{margin-top:26px}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap;margin-top:38px}
.hero-note{margin-top:22px;font-size:12px;letter-spacing:.2em;color:var(--grey)}

/* 手机模型 */
.hero-phone{display:flex;justify-content:center}
.phone{
  width:272px;height:544px;border-radius:38px;background:var(--black);
  padding:12px;box-shadow:0 40px 80px -30px rgba(0,0,0,.35);
}
.phone-screen{
  height:100%;background:var(--white);border-radius:28px;overflow:hidden;
  display:flex;flex-direction:column;
}
.app-bar{
  padding:26px 22px 14px;font-size:12px;letter-spacing:.5em;color:var(--black);
  border-bottom:1px solid var(--light);
}
.app-body{padding:26px 22px;flex:1}
.app-welcome{font-size:11px;letter-spacing:.3em;color:var(--gold)}
.app-rule{width:44px;height:1px;background:var(--gold);margin:16px 0 20px}
.app-date{font-size:44px;font-weight:200;line-height:1;letter-spacing:-.02em}
.app-date span{display:block;font-size:10px;letter-spacing:.28em;color:var(--grey);margin-top:12px;font-weight:400}
.app-card{margin-top:26px}
.app-thumb{
  height:120px;border-radius:12px;
  background:url('app-thumb.jpg') center/cover no-repeat;
}
.app-title{font-size:15px;letter-spacing:.06em;margin-top:14px}
.app-text{font-size:12px;font-weight:300;color:var(--darkgrey);line-height:1.9;margin-top:8px}
.app-meta{margin-top:26px;font-size:10px;letter-spacing:.24em;color:var(--grey)}

/* ============ 通用区块 ============ */
.section{max-width:var(--maxw);margin:0 auto;padding:110px 28px}
.section-head{margin-bottom:60px}

/* 功能网格 */
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
.card{background:var(--white);padding:44px 34px;transition:.4s ease}
.card:hover{background:#FCFAF6}
.card .num{font-size:11px;letter-spacing:.3em;color:var(--gold)}
.card h3{font-size:17px;font-weight:400;letter-spacing:.1em;margin:20px 0 14px}
.card p{font-size:13.5px;font-weight:300;color:var(--darkgrey);line-height:2}

/* ============ 痕迹墙 ============ */
.trace{
  background:var(--white);
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
}
.trace-inner{
  max-width:var(--maxw);margin:0 auto;padding:110px 28px;
  display:grid;grid-template-columns:1fr 1fr;gap:70px;align-items:center;
}
.trace .lead{color:var(--darkgrey)}
.trace h2{color:var(--black)}
.dot{display:inline-block;width:9px;height:9px;border-radius:50%;margin-right:10px}
.dot-black{background:#111111}
.dot-red{background:#C0392B}
.dot-yellow{background:#D9A400}
.trace-canvas{position:relative}
.scratches{width:100%;height:auto;display:block}
.trace-caption{margin-top:24px;font-size:12px;letter-spacing:.24em;color:var(--grey);text-align:center}

/* ============ 下载 ============ */
.download{text-align:center;padding-bottom:130px}
.download-inner{max-width:640px;margin:0 auto}
.download .rule{margin:26px auto}
.download .lead{margin-bottom:40px}

/* ============ 页脚 ============ */
.footer{background:var(--light);padding:80px 28px;text-align:center}
.brand-foot{font-size:16px;letter-spacing:.6em;font-weight:300}
.footer .rule{margin:24px auto}
.foot-text{font-size:13px;letter-spacing:.24em;color:var(--darkgrey)}
.foot-copy{margin-top:30px;font-size:11px;letter-spacing:.16em;color:var(--grey)}

/* ============ 滚动显现 ============ */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .9s ease,transform .9s cubic-bezier(.22,.61,.36,1)}
.reveal.visible{opacity:1;transform:none}

/* ============ 响应式 ============ */
@media (max-width:900px){
  .hero-inner,.trace-inner{grid-template-columns:1fr;gap:56px}
  .hero{padding:140px 24px 80px}
  .section,.trace-inner{padding:80px 24px}
  .grid{grid-template-columns:1fr}
  .nav-links{gap:22px}
  .phone{width:236px;height:476px}
}
@media (max-width:520px){
  .nav-links a{font-size:12px;letter-spacing:.1em}
  .brand{font-size:13px;letter-spacing:.36em}
  .hero-actions{flex-direction:column;align-items:stretch;text-align:center}
  .btn{text-align:center}
}