/* 爱思助手 方案一(重做)· BIG MAGAZINE SPREAD / 极致版面
   配色: 米白纸张 + 墨黑 + 越南红 + 浅金
   字体: 超大衬线 + 全大写 sans 标签
   关键词布局: Spread / Feature-1 / Quote / Spread-2 / Marquee / Voices
*/

:root{
  --bg:#f6f1e6;
  --bg-2:#ede5d2;
  --paper:#fbf7ee;
  --ink:#0e0a06;
  --ink-soft:#5a4f3a;
  --red:#c8423c;
  --gold:#c9a861;
  --line:rgba(14,10,6,.16);
  --line-strong:rgba(14,10,6,.5);
  --max:1440px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  background:var(--bg);
  color:var(--ink);
  font-family:"Times New Roman","Source Han Serif SC",Georgia,serif;
  font-size:18px;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
em{font-family:"Cormorant Garamond","Source Han Serif SC",Georgia,serif;font-style:italic;font-weight:500}

/* ===== Topbar ===== */
.be-top{
  position:sticky;
  top:0;
  z-index:30;
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:22px 40px;
  background:rgba(246,241,230,.92);
  backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}
.be-brand{display:flex;align-items:center;gap:12px;letter-spacing:.14em}
.be-brand img{width:38px;height:38px;border-radius:8px}
.be-brand span{
  font-size:22px;
  font-weight:700;
  letter-spacing:.18em;
  text-transform:uppercase;
}
.be-top nav{display:flex;align-items:center;gap:32px;font-size:13px;letter-spacing:.18em;text-transform:uppercase;font-weight:700;font-family:"Helvetica Neue",Arial,sans-serif}
.be-top nav a{color:var(--ink);transition:.2s}
.be-top nav a:hover{color:var(--red)}
.be-cta{
  background:var(--ink);
  color:#fff !important;
  padding:12px 24px;
  letter-spacing:.22em;
}
.be-cta:hover{background:var(--red)}

/* ===== Hero · 大版面 ===== */
.be-hero{
  position:relative;
  max-width:var(--max);
  margin:0 auto;
  padding:60px 40px 80px;
  display:grid;
  grid-template-columns:1.15fr 1fr;
  gap:60px;
  align-items:center;
}
.be-kicker{
  font-family:"Helvetica Neue",Arial,sans-serif;
  font-size:12px;
  letter-spacing:.42em;
  color:var(--red);
  text-transform:uppercase;
  margin-bottom:36px;
}
.be-hero-text h1{
  font-size:clamp(40px,5.4vw,84px);
  font-weight:400;
  line-height:1;
  letter-spacing:-.03em;
  margin-bottom:28px;
}
.be-hero-text h1 em{color:var(--red);font-size:1.05em}
.be-deck{
  font-family:"Cormorant Garamond",Georgia,serif;
  font-style:italic;
  font-size:24px;
  color:var(--ink-soft);
  line-height:1.5;
  max-width:560px;
  margin-bottom:36px;
}
.be-meta{
  display:flex;
  gap:14px;
  font-family:"Helvetica Neue",Arial,sans-serif;
  font-size:12px;
  letter-spacing:.28em;
  color:var(--ink-soft);
  padding:18px 0;
  border-top:1px solid var(--line-strong);
  border-bottom:1px solid var(--line-strong);
  margin-bottom:36px;
  text-transform:uppercase;
}
.be-cta-row{display:flex;gap:18px;align-items:center;flex-wrap:wrap}
.be-cta-pri{
  background:var(--ink);
  color:#fff;
  padding:18px 32px;
  font-family:"Helvetica Neue",Arial,sans-serif;
  font-size:13px;
  font-weight:700;
  letter-spacing:.22em;
  text-transform:uppercase;
  transition:.25s;
}
.be-cta-pri:hover{background:var(--red);transform:translateY(-2px)}
.be-cta-pri.big{padding:24px 48px;font-size:15px}
.be-cta-sec{
  color:var(--ink);
  font-family:"Helvetica Neue",Arial,sans-serif;
  font-size:13px;
  letter-spacing:.22em;
  font-weight:700;
  text-transform:uppercase;
}
.be-cta-sec:hover{color:var(--red)}

/* Hero image with floating tags */
.be-hero-img{position:relative;align-self:stretch;display:flex;align-items:center}
.be-hero-img img{
  width:100%;
  border:1px solid var(--line-strong);
  aspect-ratio:4/5;
  object-fit:cover;
}
.be-tag{
  position:absolute;
  background:var(--paper);
  border:1px solid var(--line-strong);
  padding:8px 14px;
  font-family:"Helvetica Neue",Arial,sans-serif;
  font-size:11px;
  letter-spacing:.22em;
  font-weight:700;
  text-transform:uppercase;
  z-index:3;
}
.be-tag-1{top:30px;left:-24px;background:var(--red);color:#fff;border-color:var(--red)}
.be-tag-2{bottom:30px;right:-24px;background:var(--ink);color:var(--paper);border-color:var(--ink)}
.be-tag-3{top:50%;right:-12px;background:var(--paper);color:var(--ink);transform:rotate(90deg);transform-origin:right center;padding:6px 18px}

.be-running{
  position:absolute;
  bottom:24px;
  left:0;
  right:0;
  font-family:"Helvetica Neue",Arial,sans-serif;
  font-size:11px;
  letter-spacing:.32em;
  color:var(--ink-soft);
  text-align:center;
  text-transform:uppercase;
  padding-top:18px;
  border-top:1px solid var(--line);
}

/* ===== Spread · 双页跨页 ===== */
.be-spread{
  max-width:var(--max);
  margin:0 auto;
  padding:100px 40px;
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:80px;
  align-items:center;
  border-top:4px double var(--line-strong);
}
.be-spread.flip .be-spread-left{order:2}
.be-eyebrow{
  font-family:"Helvetica Neue",Arial,sans-serif;
  font-size:12px;
  letter-spacing:.32em;
  color:var(--red);
  text-transform:uppercase;
  margin-bottom:28px;
}
.be-eyebrow.center{text-align:center}
.be-spread h2{
  font-size:clamp(48px,6.4vw,108px);
  font-weight:400;
  line-height:1;
  letter-spacing:-.04em;
  margin-bottom:32px;
}
.be-spread h2 em{color:var(--red)}
.be-lede{
  font-family:"Cormorant Garamond",Georgia,serif;
  font-style:italic;
  font-size:22px;
  color:var(--ink-soft);
  line-height:1.55;
  margin-bottom:30px;
  max-width:540px;
}
.be-bullets{list-style:none;border-top:1px solid var(--line-strong)}
.be-bullets li{
  padding:14px 0;
  border-bottom:1px solid var(--line);
  display:flex;
  gap:18px;
  align-items:baseline;
  font-size:16px;
}
.be-bullets li span{
  font-family:"Times New Roman",serif;
  font-size:24px;
  color:var(--red);
  font-style:italic;
  flex-shrink:0;
  width:34px;
}
.be-stats{
  display:flex;
  gap:36px;
  margin-top:36px;
  padding-top:36px;
  border-top:1px solid var(--line-strong);
}
.be-stats div{display:flex;flex-direction:column}
.be-stats b{
  font-size:clamp(36px,4vw,60px);
  color:var(--red);
  font-weight:400;
  line-height:1;
  letter-spacing:-.02em;
}
.be-stats span{font-size:13px;color:var(--ink-soft);margin-top:6px;font-family:"Helvetica Neue",sans-serif;letter-spacing:.12em}

.be-rank{list-style:none;border-top:1px solid var(--line-strong)}
.be-rank li{
  display:grid;
  grid-template-columns:60px 1fr auto;
  align-items:center;
  padding:18px 0;
  border-bottom:1px solid var(--line);
}
.be-rank b{
  font-family:"Times New Roman",serif;
  font-size:36px;
  color:var(--red);
  font-weight:400;
  line-height:1;
}
.be-rank span{font-size:18px;font-weight:700;letter-spacing:.02em}
.be-rank i{
  font-family:"Cormorant Garamond",Georgia,serif;
  font-style:italic;
  color:var(--gold);
  font-size:18px;
}

.be-spread-img img{width:100%;border:1px solid var(--line-strong);aspect-ratio:4/5;object-fit:cover}
.be-spread-img{position:relative}

/* ===== Quote · 大引文 ===== */
.be-quote{
  background:var(--ink);
  color:var(--paper);
  padding:120px 40px;
  text-align:center;
}
.be-quote p{
  font-family:"Cormorant Garamond",Georgia,serif;
  font-style:italic;
  font-size:clamp(36px,4.6vw,72px);
  line-height:1.2;
  font-weight:500;
  max-width:980px;
  margin:0 auto;
}
.be-quote em{color:var(--gold)}
.be-quote cite{
  display:block;
  margin-top:30px;
  font-style:normal;
  font-family:"Helvetica Neue",Arial,sans-serif;
  font-size:12px;
  letter-spacing:.32em;
  color:var(--gold);
  text-transform:uppercase;
}

/* ===== Marquee · 跑马灯 ===== */
.be-marquee{
  background:var(--red);
  color:#fff;
  padding:24px 0;
  overflow:hidden;
  border-top:1px solid var(--ink);
  border-bottom:1px solid var(--ink);
}
.be-marquee-track{
  display:flex;
  gap:36px;
  white-space:nowrap;
  animation:be-marquee 30s linear infinite;
  font-family:"Times New Roman",serif;
  font-size:32px;
  letter-spacing:.06em;
  font-style:italic;
}
.be-marquee-track span{flex-shrink:0}
.be-marquee-track i{color:var(--gold);font-style:normal;flex-shrink:0}
@keyframes be-marquee{
  from{transform:translateX(0)}
  to{transform:translateX(-50%)}
}

/* ===== Floating Download Button · 全局 FAB ===== */
.dl-fab{
  position:fixed;
  right:28px;
  bottom:28px;
  z-index:50;
  display:flex;
  align-items:center;
  gap:10px;
  padding:14px 22px 14px 18px;
  background:var(--ink);
  color:var(--paper);
  border:1px solid var(--ink);
  border-radius:99px;
  font-family:"Helvetica Neue",Arial,sans-serif;
  font-size:13px;
  font-weight:800;
  letter-spacing:.22em;
  text-transform:uppercase;
  box-shadow:0 18px 50px -10px rgba(14,10,6,.45);
  transition:.25s;
  text-decoration:none;
}
.dl-fab:hover{
  background:var(--red);
  border-color:var(--red);
  transform:translateY(-3px);
  box-shadow:0 24px 60px -10px rgba(200,66,60,.55);
  color:#fff;
}
.dl-fab .fab-ico{
  width:36px;height:36px;
  display:flex;align-items:center;justify-content:center;
  background:var(--red);
  color:#fff;
  border-radius:50%;
  font-size:18px;
  transition:.25s;
}
.dl-fab:hover .fab-ico{background:#fff;color:var(--red)}
.dl-fab .fab-ico svg{width:16px;height:16px;display:block}
.dl-fab .fab-tag{
  font-size:9px;
  letter-spacing:.32em;
  color:var(--gold);
  margin-top:2px;
  display:block;
  font-weight:700;
}
.dl-fab .fab-text{
  display:flex;flex-direction:column;line-height:1.1;
}
.dl-fab .fab-title{font-size:13px;letter-spacing:.18em}
.dl-fab .fab-sub{font-size:9px;letter-spacing:.32em;color:var(--gold);margin-top:3px;font-weight:700}
@media (max-width:560px){
  .dl-fab{
    right:14px;bottom:14px;
    padding:10px 14px 10px 12px;
    gap:8px;
  }
  .dl-fab .fab-ico{width:32px;height:32px;font-size:15px}
  .dl-fab .fab-title{font-size:11px}
  .dl-fab .fab-sub{font-size:8px}
  .dl-fab .fab-tag{display:none}
}

/* ===== Voices ===== */
.be-voices{
  max-width:var(--max);
  margin:0 auto;
  padding:120px 40px;
}
.be-voices-title{
  font-size:clamp(48px,6vw,108px);
  font-weight:400;
  line-height:1;
  letter-spacing:-.04em;
  margin-bottom:60px;
}
.be-voices-title em{color:var(--red)}
.be-vgrid{
  display:grid;
  grid-template-columns:1fr 1fr 1fr;
  gap:24px;
  border-top:4px double var(--line-strong);
}
.be-vcard{
  background:var(--paper);
  border:1px solid var(--line-strong);
  padding:42px;
  transition:.25s;
}
.be-vcard:hover{background:var(--bg-2)}
.be-vcard.dark{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.be-vcard.dark:hover{background:var(--red)}
.be-vcard p{
  font-family:"Cormorant Garamond",Georgia,serif;
  font-style:italic;
  font-size:22px;
  line-height:1.45;
  margin-bottom:22px;
}
.be-vcard cite{
  font-family:"Helvetica Neue",Arial,sans-serif;
  font-style:normal;
  font-size:11px;
  letter-spacing:.22em;
  color:var(--ink-soft);
  text-transform:uppercase;
}
.be-vcard.dark cite{color:var(--gold)}

/* ===== CTA Band ===== */
.be-cta-band{
  background:var(--ink);
  color:var(--paper);
  text-align:center;
  padding:140px 40px;
  position:relative;
  overflow:hidden;
}
.be-cta-band::before{
  content:"“ ”";
  position:absolute;
  font-family:"Cormorant Garamond",Georgia,serif;
  font-style:italic;
  font-size:560px;
  color:rgba(201,168,97,.06);
  top:50%;
  left:50%;
  transform:translate(-50%,-50%);
  line-height:1;
}
.be-cta-band h2{
  position:relative;
  font-size:clamp(46px,6vw,104px);
  font-weight:400;
  line-height:1.05;
  margin-bottom:50px;
  letter-spacing:-.03em;
}
.be-cta-band h2 em{color:var(--red)}
.be-cta-band .be-cta-pri{
  position:relative;
  background:var(--red);
  color:#fff;
}
.be-cta-band .be-cta-pri:hover{background:var(--paper);color:var(--ink)}

/* ===== Footer ===== */
.be-foot{
  background:var(--paper);
  border-top:4px double var(--line-strong);
  padding:40px 0;
}
.be-foot-inner{
  max-width:var(--max);
  margin:0 auto;
  padding:0 40px;
  display:flex;
  justify-content:space-between;
  align-items:center;
}
.be-foot img{width:34px;height:34px;border-radius:8px;display:inline-block;vertical-align:middle}
.be-foot b{
  font-size:22px;
  font-weight:700;
  letter-spacing:.18em;
  text-transform:uppercase;
  margin-left:12px;
}
.be-foot p{
  font-family:"Helvetica Neue",Arial,sans-serif;
  font-size:11px;
  letter-spacing:.22em;
  color:var(--ink-soft);
  margin-top:6px;
  text-transform:uppercase;
}
.be-foot-right{display:flex;align-items:center;gap:22px;font-size:13px;letter-spacing:.14em;font-family:"Helvetica Neue",sans-serif}
.be-foot-right a:hover{color:var(--red)}

/* ===== 下载页 (download.html) ===== */
.be-dl-hero{
  max-width:var(--max);
  margin:0 auto;
  padding:80px 40px 60px;
  position:relative;
  text-align:center;
  border-bottom:4px double var(--line-strong);
}
.be-dl-hero .be-kicker{margin-bottom:30px}
.be-dl-hero h1{
  font-size:clamp(38px,5vw,76px);
  font-weight:400;
  line-height:1;
  letter-spacing:-.03em;
  margin-bottom:28px;
}
.be-dl-hero h1 em{color:var(--red)}
.be-dl-hero .be-deck{
  margin:0 auto 40px;
  font-size:22px;
}
.be-dl-hero .be-cta-pri{margin-bottom:60px}
.be-dl-img{
  position:relative;
  display:inline-block;
  max-width:640px;
  margin:0 auto;
  text-align:left;
}
.be-dl-img img{width:100%;border:1px solid var(--line-strong)}

.be-platforms{
  max-width:var(--max);
  margin:0 auto;
  padding:100px 40px;
}
.be-pl-title{
  font-size:clamp(48px,5.4vw,84px);
  font-weight:400;
  line-height:1;
  letter-spacing:-.03em;
  margin-bottom:50px;
  text-align:center;
}
.be-pl-title em{color:var(--red)}
.be-pl-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:0;
  border-top:1px solid var(--line-strong);
  border-left:1px solid var(--line-strong);
}
.be-pl-card{
  padding:36px 28px;
  background:var(--paper);
  border-right:1px solid var(--line-strong);
  border-bottom:1px solid var(--line-strong);
  transition:.25s;
}
.be-pl-card:hover{background:var(--bg-2)}
.be-pl-os{
  display:inline-block;
  font-family:"Helvetica Neue",Arial,sans-serif;
  font-size:10px;
  letter-spacing:.32em;
  color:var(--red);
  font-weight:700;
  margin-bottom:18px;
  text-transform:uppercase;
}
.be-pl-card h3{
  font-size:30px;
  font-weight:400;
  margin-bottom:14px;
  letter-spacing:-.01em;
}
.be-pl-card p{font-size:14px;color:var(--ink-soft);margin-bottom:24px;line-height:1.6}
.be-pl-btn{
  display:inline-block;
  background:transparent;
  color:var(--ink);
  border:1.5px solid var(--ink);
  padding:12px 22px;
  font-family:"Helvetica Neue",Arial,sans-serif;
  font-size:11px;
  letter-spacing:.22em;
  font-weight:700;
  text-transform:uppercase;
  transition:.25s;
}
.be-pl-btn:hover{background:var(--ink);color:var(--paper)}

.be-steps{
  background:var(--ink);
  color:var(--paper);
  padding:120px 40px;
}
.be-eyebrow,.be-steps-title,.be-req-title{
  text-align:center;
  max-width:var(--max);
  margin-left:auto;
  margin-right:auto;
}
.be-steps-title{
  font-size:clamp(48px,6vw,104px);
  font-weight:400;
  line-height:1;
  letter-spacing:-.03em;
  margin-bottom:80px;
}
.be-steps-title em{color:var(--gold)}
.be-step{
  max-width:var(--max);
  margin:0 auto;
  display:grid;
  grid-template-columns:200px 1fr;
  gap:60px;
  padding:48px 0;
  border-top:1px solid rgba(245,239,227,.18);
  align-items:start;
}
.be-step:last-child{border-bottom:1px solid rgba(245,239,227,.18)}
.be-step.flip{grid-template-columns:1fr 200px}
.be-step.flip > div{order:2}
.be-step.flip .be-sn{order:1;text-align:right}
.be-sn{
  font-family:"Times New Roman",serif;
  font-size:128px;
  font-weight:400;
  color:var(--red);
  line-height:.85;
  letter-spacing:-.04em;
}
.be-step h4{
  font-size:34px;
  font-weight:400;
  margin-bottom:14px;
  letter-spacing:-.01em;
}
.be-step p{font-size:17px;color:var(--paper-2,rgba(245,239,227,.78))}

.be-req{
  max-width:var(--max);
  margin:0 auto;
  padding:120px 40px;
}
.be-req-title{
  font-size:clamp(48px,5.4vw,96px);
  font-weight:400;
  line-height:1;
  letter-spacing:-.03em;
  margin-bottom:60px;
}
.be-req-title em{color:var(--red)}
.be-req-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:0;
  border-top:4px double var(--line-strong);
  border-left:1px solid var(--line-strong);
}
.be-req-card{
  padding:36px 28px;
  background:var(--paper);
  border-right:1px solid var(--line-strong);
  border-bottom:1px solid var(--line-strong);
  transition:.25s;
}
.be-req-card:hover{background:var(--bg-2)}
.be-req-os{
  display:inline-block;
  font-family:"Helvetica Neue",Arial,sans-serif;
  font-size:10px;
  letter-spacing:.32em;
  color:var(--red);
  font-weight:700;
  margin-bottom:18px;
  text-transform:uppercase;
}
.be-req-card h3{
  font-size:30px;
  font-weight:400;
  margin-bottom:14px;
  letter-spacing:-.01em;
}
.be-req-card p{font-size:14px;color:var(--ink-soft);line-height:1.6}

/* ===== 响应式 ===== */
@media (max-width:1100px){
  .be-top{padding:16px 22px;flex-wrap:wrap;gap:14px}
  .be-top nav{gap:18px;font-size:12px}
  .be-hero{grid-template-columns:1fr;gap:50px;padding:50px 22px 80px}
  .be-spread,.be-spread.flip{grid-template-columns:1fr;gap:36px;padding:60px 22px}
  .be-spread.flip .be-spread-left{order:0}
  .be-pl-grid,.be-vgrid,.be-req-grid{grid-template-columns:1fr 1fr}
  .be-step,.be-step.flip{grid-template-columns:1fr;gap:14px}
  .be-step.flip > div,.be-step.flip .be-sn{order:0;text-align:left}
  .be-foot-inner{flex-direction:column;gap:18px;align-items:flex-start}
}
@media (max-width:560px){
  body{font-size:16px}
  .be-hero-text h1,.be-dl-hero h1{font-size:38px}
  .be-spread h2,.be-pl-title,.be-steps-title,.be-req-title,.be-voices-title{font-size:36px}
  .be-pl-grid,.be-vgrid,.be-req-grid{grid-template-columns:1fr}
  .be-sn{font-size:80px}
  .be-quote{padding:60px 22px}
  .be-quote p{font-size:28px}
  .be-cta-band{padding:80px 22px}
  .be-cta-band h2{font-size:36px}
}