/* ============================================================
   marelvo — landing page
   单产品落地页样式。与 style.css（法律页）分开，互不影响。
   ============================================================ */

:root{
  --navy:#0E2F4A;
  --navy-2:#1B4463;
  --gold:#F0B429;
  --gold-dark:#D99E14;
  --ink:#12212E;
  --body:#2B3A47;
  --muted:#5A6B7A;
  --line:#E4E9EE;
  --soft:#F6F8FA;
  --ok:#1E7A5A;
  --max:720px;
}

*{box-sizing:border-box}

html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}

body{
  margin:0;
  background:#fff;
  color:var(--ink);
  font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  font-size:17px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

a{color:var(--navy)}
img,svg{max-width:100%;display:block}

.wrap{max-width:var(--max);margin:0 auto;padding:0 22px}

/* ---------- header ---------- */

.top{
  border-bottom:1px solid var(--line);
  background:#fff;
}
.top .wrap{
  display:flex;align-items:center;gap:11px;
  padding-top:16px;padding-bottom:16px;
}
.top .logo{width:28px;height:28px;flex:none}
.top .brand{
  font-weight:700;font-size:18px;letter-spacing:-.02em;
  color:var(--navy);text-decoration:none;
}
.top .spacer{flex:1}
.top .mini{
  font-size:14px;font-weight:600;color:var(--navy);
  text-decoration:none;border-bottom:2px solid var(--gold);
  padding-bottom:1px;white-space:nowrap;
}
.top .mini:hover{color:var(--navy-2)}

/* ---------- hero ---------- */

.hero{
  padding:52px 0 44px;
  background:
    radial-gradient(1100px 380px at 50% -140px, #EDF2F6 0%, rgba(237,242,246,0) 72%),
    #fff;
}
.hero .wrap{text-align:center}
.eyebrow{
  display:inline-block;margin:0 0 18px;
  font-size:12.5px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;
  color:var(--navy);background:#EDF2F6;border-radius:999px;padding:6px 14px;
}
.hero h1{
  margin:0 0 18px;
  font-size:clamp(27px,5.6vw,40px);
  line-height:1.22;
  letter-spacing:-.025em;
  color:var(--navy);
  font-weight:800;
  text-wrap:balance;
}
.hero h1 em{
  font-style:normal;
  background-image:linear-gradient(rgba(240,180,41,.52),rgba(240,180,41,.52));
  background-size:100% .24em;
  background-position:0 91%;
  background-repeat:no-repeat;
  padding:0 2px;
}
.hero .lead{
  margin:0 auto 30px;
  max-width:560px;
  font-size:17.5px;
  color:var(--body);
}

/* ---------- CTA ---------- */

.cta{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  min-height:56px;padding:0 30px;
  background:var(--gold);
  color:#1A1200;
  font-size:17.5px;font-weight:800;letter-spacing:-.01em;
  text-decoration:none;
  border:0;border-radius:12px;
  box-shadow:0 2px 0 var(--gold-dark), 0 10px 26px -12px rgba(240,180,41,.85);
  transition:transform .13s ease, box-shadow .13s ease, background .13s ease;
}
.cta:hover{
  background:#F5C044;
  transform:translateY(-1px);
  box-shadow:0 3px 0 var(--gold-dark), 0 14px 30px -12px rgba(240,180,41,.9);
}
.cta:active{transform:translateY(1px);box-shadow:0 1px 0 var(--gold-dark)}
.cta:focus-visible{outline:3px solid var(--navy);outline-offset:3px}
.cta--block{display:flex;width:100%;max-width:420px;margin:0 auto}

.under-cta{
  margin:14px 0 0;
  font-size:13.5px;color:var(--muted);
}
.under-cta strong{color:var(--body);font-weight:600}

/* ---------- trust row ---------- */

.trust{
  list-style:none;margin:32px auto 0;padding:0;
  display:flex;flex-wrap:wrap;justify-content:center;gap:10px 24px;
  max-width:600px;
}
.trust li{
  font-size:14px;color:var(--body);
  display:flex;align-items:center;gap:7px;
}
.trust .tick{
  width:16px;height:16px;flex:none;color:var(--ok);
}

/* ---------- section shell ---------- */

section{padding:56px 0}
section.tint{background:var(--soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}

.sec-head{max-width:620px;margin:0 auto 34px;text-align:center}
.sec-head h2{
  margin:0 0 12px;
  font-size:clamp(21px,3.9vw,27px);
  line-height:1.3;letter-spacing:-.02em;
  color:var(--navy);
  text-wrap:balance;
}
.sec-head p{margin:0;color:var(--muted);font-size:16px}

/* ---------- situations ---------- */

.cards{display:grid;gap:16px}
@media(min-width:640px){.cards{grid-template-columns:repeat(3,1fr)}}

.card{
  background:#fff;border:1px solid var(--line);border-radius:14px;
  padding:22px 20px;
}
.card .num{
  display:flex;align-items:center;justify-content:center;
  width:30px;height:30px;margin-bottom:13px;
  background:var(--navy);color:#fff;
  border-radius:9px;font-size:14px;font-weight:700;
}
.card h3{
  margin:0 0 8px;
  font-size:16.5px;line-height:1.35;
  color:var(--navy);letter-spacing:-.01em;
}
.card p{margin:0;font-size:15px;color:var(--body)}

/* ---------- inside / deliverables ---------- */

.items{display:grid;gap:0;border-top:1px solid var(--line)}
.item{
  display:grid;
  grid-template-columns:26px 1fr;
  gap:14px;
  padding:17px 2px;
  border-bottom:1px solid var(--line);
}
.item .ico{color:var(--navy);width:22px;height:22px;margin-top:2px}
.item h3{
  margin:0 0 3px;
  font-size:16px;color:var(--navy);letter-spacing:-.01em;
}
.item p{margin:0;font-size:14.5px;color:var(--body)}
.item .pages{
  display:inline-block;margin-left:7px;
  font-size:12px;font-weight:600;color:var(--muted);
  background:#EDF2F6;border-radius:5px;padding:1px 6px;
  vertical-align:1px;
}

/* ---------- preview (台词) ---------- */

.preview{
  background:var(--navy);
  color:#fff;
  border:0;
}
.preview .sec-head h2{color:#fff}
.preview .sec-head p{color:#B7C7D4}

.say{display:grid;gap:18px;max-width:620px;margin:0 auto}

.say-card{
  background:rgba(255,255,255,.06);
  border:1px solid rgba(255,255,255,.14);
  border-radius:14px;
  padding:20px 22px;
}
.say-card .q{
  margin:0 0 12px;
  font-size:15px;font-weight:700;color:var(--gold);
  letter-spacing:.01em;
}
.say-card .a{
  margin:0 0 12px;
  font-size:15.5px;color:#DCE6EE;
}
.say-card .line{
  margin:0;
  padding:13px 16px;
  background:#fff;
  color:var(--navy);
  border-radius:9px;
  font-size:16px;font-weight:600;
  line-height:1.5;
}
.say-card .note{
  margin:12px 0 0;
  font-size:13.5px;color:#AEC2D1;
}

.source-note{
  max-width:620px;margin:24px auto 0;
  font-size:13px;color:#9DB4C4;text-align:center;
}

/* ---------- letter sample (文档预览) ---------- */

.letter-wrap{max-width:560px;margin:0 auto}
.letter{
  background:#fff;
  border:1px solid #DCE3EA;
  border-radius:4px;
  padding:30px 30px 26px;
  box-shadow:0 18px 40px -20px rgba(14,47,74,.35), 0 2px 6px rgba(14,47,74,.06);
  font-family:Georgia,"Times New Roman",serif;
  color:#1E2B36;
  font-size:14.5px;
  line-height:1.75;
  transform:rotate(-.35deg);
}
.letter .to{color:#5A6B7A;font-size:13.5px}
.letter .subject{
  margin:16px 0 14px;
  font-weight:700;
  color:var(--navy);
}
.letter p{margin:0 0 12px}
.letter .sig{
  margin-top:20px;padding-top:12px;
  border-top:1px solid #E4E9EE;
  font-size:13px;color:#5A6B7A;
}
.letter .hl{
  background:linear-gradient(transparent 60%, rgba(240,180,41,.5) 60%);
}
.letter-cap{
  max-width:560px;margin:16px auto 0;
  font-size:13px;color:var(--muted);text-align:center;
}

/* ---------- price ---------- */

.price-box{
  max-width:480px;margin:0 auto;
  background:#fff;
  border:1px solid var(--line);
  border-radius:16px;
  padding:34px 26px 30px;
  text-align:center;
  box-shadow:0 14px 40px -26px rgba(14,47,74,.4);
}
.price-box .amount{
  display:flex;align-items:baseline;justify-content:center;gap:5px;
  margin:0 0 4px;
  color:var(--navy);
}
.price-box .cur{font-size:20px;font-weight:700;align-self:flex-start;margin-top:9px}
.price-box .num{font-size:54px;font-weight:800;letter-spacing:-.04em;line-height:1}
.price-box .once{font-size:14.5px;color:var(--muted);margin:0 0 24px}
.price-box ul{
  list-style:none;margin:24px 0 0;padding:20px 0 0;
  border-top:1px solid var(--line);
  text-align:left;
  display:grid;gap:10px;
}
.price-box li{
  display:grid;grid-template-columns:18px 1fr;gap:9px;
  font-size:14.5px;color:var(--body);
}
.price-box .tick{width:16px;height:16px;color:var(--ok);margin-top:3px}

/* ---------- faq ---------- */

.faq-list{max-width:640px;margin:0 auto;border-top:1px solid var(--line)}
details{
  border-bottom:1px solid var(--line);
}
summary{
  cursor:pointer;
  padding:19px 34px 19px 0;
  position:relative;
  font-size:16px;font-weight:600;color:var(--navy);
  list-style:none;
  line-height:1.5;
}
summary::-webkit-details-marker{display:none}
summary::after{
  content:"";
  position:absolute;right:6px;top:50%;
  width:9px;height:9px;margin-top:-6px;
  border-right:2px solid var(--muted);
  border-bottom:2px solid var(--muted);
  transform:rotate(45deg);
  transition:transform .18s ease;
}
details[open] summary::after{transform:rotate(-135deg);margin-top:-3px}
summary:focus-visible{outline:2px solid var(--navy);outline-offset:2px;border-radius:4px}
details .ans{
  padding:0 30px 20px 0;
  font-size:15px;color:var(--body);
}
details .ans p{margin:0 0 10px}
details .ans p:last-child{margin-bottom:0}

/* ---------- disclaimer ---------- */

.disclaimer{
  max-width:640px;margin:0 auto;
  border-left:3px solid var(--gold);
  padding:4px 0 4px 18px;
  font-size:14.5px;color:var(--body);
}
.disclaimer strong{color:var(--ink)}
/* 免责之后紧接最终 CTA，收一点底距，避免中间出现大片空白 */
.sec-note{padding-bottom:22px}

/* ---------- final cta ---------- */

.final{
  text-align:center;
  background:
    radial-gradient(900px 320px at 50% 120%, #E9EFF4 0%, rgba(233,239,244,0) 70%),
    #fff;
}
.final h2{
  margin:0 0 12px;
  font-size:clamp(21px,3.9vw,26px);
  letter-spacing:-.02em;color:var(--navy);
  line-height:1.3;
}
.final p{margin:0 0 26px;color:var(--muted);font-size:16px}

/* ---------- leituras（首页 → 内容页内链） ---------- */

.leituras{max-width:640px;margin:34px auto 0}
.leituras h3{
  margin:0 0 13px;
  font-size:13px;letter-spacing:.07em;text-transform:uppercase;
  color:var(--muted);font-weight:700;
}
.leituras h3:not(:first-child){margin-top:28px}
.leituras ul{list-style:none;margin:0;padding:0;display:grid;gap:10px}
.leituras li{margin:0}
.leituras a{
  display:block;
  padding:14px 16px;
  background:#fff;
  border:1px solid var(--line);
  border-radius:11px;
  font-size:15.5px;font-weight:600;line-height:1.4;color:var(--navy);
  text-decoration:none;
  transition:border-color .13s ease;
}
.leituras a:hover{border-color:#C9D5DF}
.leituras a span{
  display:block;margin-top:3px;
  font-size:13.5px;font-weight:400;color:var(--muted);
}

/* 指向 /guia/ 目录页的收口链接 */
.leituras .vertodas{
  margin:20px 0 0;
  text-align:center;
  font-size:14.5px;
}
.leituras .vertodas a{
  display:inline;
  padding:0;
  background:none;
  border:0;
  border-bottom:2px solid var(--gold);
  border-radius:0;
  font-size:14.5px;
  font-weight:700;
  color:var(--navy);
  padding-bottom:1px;
}
.leituras .vertodas a:hover{border-color:var(--navy)}

/* ---------- footer ---------- */

.site-foot{
  border-top:1px solid var(--line);
  padding:26px 0 34px;
  font-size:12.8px;
  color:var(--muted);
}
.site-foot .wrap{display:grid;gap:8px}
.site-foot .row{
  display:flex;flex-wrap:wrap;gap:7px 20px;align-items:center;
}
.site-foot a{color:var(--muted);text-decoration:none;border-bottom:1px solid transparent}
.site-foot a:hover{color:var(--navy);border-bottom-color:var(--gold)}
/* 分隔点在小屏换行时会出现「行首孤立 ·」，用间距代替符号 */
.site-foot .sep{display:none}

/* ---------- motion ---------- */

@media(prefers-reduced-motion:reduce){
  *{transition:none!important;animation:none!important}
  html{scroll-behavior:auto}
  .letter{transform:none}
}

@media(max-width:520px){
  .hero{padding:40px 0 36px}
  section{padding:44px 0}
  .letter{padding:24px 22px;font-size:13.5px}
  .price-box .num{font-size:46px}
  .cta{width:100%;max-width:420px}
}