/* ══════════════════════════════════════════════════════
   Acelogic v3.1 — 白底 · 深海军蓝 · 青绿点睛 · 科技插画
   结构：首屏插画左 / 文案右 · 次屏竖排列表 · 强文字动效
   ══════════════════════════════════════════════════════ */

:root{
  --bg:        #FFFFFF;
  --bg-soft:   #F7FAFC;
  --navy:      #0A2846;
  --navy-2:    #1B3A5C;
  --teal:      #12B8B2;
  /* --teal 用于线条 / 节点 / 图标 / 光晕等非文字元素；
     --teal-ink 是同一色相的文字版：对白底 5.04:1、对 --bg-soft 4.81:1，
     满足 WCAG AA（PRD §3.4「不达就调深」）。 */
  --teal-ink:  #0A7C78;
  --fg:        #0A2846;
  --fg-2:      #4E6076;
  --fg-3:      #5F7286;
  --line:      #E3EBF2;
  --line-2:    #EEF4F8;

  --cn: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", "WenQuanYi Micro Hei", sans-serif;
  --geo: "SF Pro Display", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;

  --wrap: 1200px;
  --ease: cubic-bezier(.22, 1, .36, 1);
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0; background:var(--bg); color:var(--fg);
  font-family:var(--cn); font-size:16px; line-height:1.7;
  -webkit-font-smoothing:antialiased; overflow-x:hidden;
}
img{max-width:100%; height:auto; display:block}
a{color:inherit; text-decoration:none}
em{font-style:normal; color:var(--teal-ink)}
h1,h2,h3{margin:0; font-weight:800; letter-spacing:-.025em; line-height:1.2}
p{margin:0}
ul,ol{margin:0; padding:0; list-style:none}
.wrap{width:100%; max-width:var(--wrap); margin:0 auto; padding:0 40px}

/* ══ 顶栏（桌面显示，移动隐藏） ══ */
.nav{
  position:sticky; top:0; z-index:50;
  background:rgba(255,255,255,.9);
  backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid var(--line-2);
}
.nav__in{display:flex; align-items:center; justify-content:space-between; height:78px}
.nav__brand img{height:54px; width:auto}
.nav__links{display:flex; gap:40px}
.nav__links a{
  font-size:15px; color:var(--fg-2); position:relative; padding:4px 0;
  transition:color .2s;
}
.nav__links a::after{
  content:""; position:absolute; left:0; right:0; bottom:-2px; height:2px;
  background:var(--teal); transform:scaleX(0); transform-origin:left;
  transition:transform .3s var(--ease);
}
.nav__links a:hover{color:var(--navy)}
.nav__links a:hover::after{transform:scaleX(1)}

/* ══ 首屏：插画左 / 文案右 ══ */
.hero{padding:70px 0 100px; overflow:hidden}
.hero__grid{
  display:grid; grid-template-columns:minmax(0,1.06fr) minmax(0,1fr);
  gap:56px; align-items:center;
}
.hero__art{margin:0; position:relative}
.hero__art img{width:100%; height:auto}
.hero__art::before{
  content:""; position:absolute; inset:0; z-index:-1;
  background:radial-gradient(ellipse 60% 56% at 50% 50%, rgba(18,184,178,.06), transparent 70%);
}

.hero__title{
  font-size:clamp(38px, 4.5vw, 68px);
  line-height:1.15; letter-spacing:-.038em;
  color:var(--navy);
}
.hero__title span{display:block}
.hero__title .l2{margin-top:8px}
.hero__sub{
  margin-top:32px; font-size:clamp(16px,1.35vw,19px); line-height:1.8;
  color:var(--fg-2); max-width:24em;
}

/* ══ 通用区块 ══ */
.sec{padding:110px 0; border-top:1px solid var(--line-2)}
.sec--see{background:var(--bg-soft)}
.sec--how{background:var(--bg-soft)}

.kicker{
  font-size:13px; font-weight:700; letter-spacing:.24em;
  color:var(--teal-ink); margin-bottom:30px;
  display:flex; align-items:center; gap:12px;
}
.kicker::before{content:""; width:24px; height:2px; background:var(--teal); border-radius:2px}

.h2{
  font-size:clamp(26px,2.9vw,42px); color:var(--navy);
  margin-bottom:56px; letter-spacing:-.032em;
}

/* ── 01 四条：竖排列表（去掉卡片与网格）── */
.facts{max-width:900px}
.facts__row{
  display:grid; grid-template-columns:64px 1fr; gap:28px;
  align-items:baseline; padding:30px 0;
  border-bottom:1px solid var(--line);
}
.facts__row:first-child{border-top:1px solid var(--line)}
.facts__n{
  font-family:var(--geo); font-size:14px; font-weight:700;
  color:var(--teal-ink); letter-spacing:.08em;
}
.facts__t{
  font-size:clamp(22px,2.4vw,34px); font-weight:800;
  letter-spacing:-.028em; line-height:1.35; color:var(--navy);
}
.facts__t b{font-weight:800}
.facts__row--key .facts__t{
  color:var(--navy);
}
.facts__row--key .facts__t em{
  border-bottom:3px solid rgba(18,184,178,.35); padding-bottom:2px;
}

/* ── 02 三条业务：带线条图标 ── */
.biz{display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:1px;
  background:var(--line); border-top:1px solid var(--line); border-bottom:1px solid var(--line)}
.biz__item{background:#fff; padding:48px 40px 54px; position:relative}
.biz__ic{
  display:flex; align-items:center; justify-content:center;
  width:46px; height:46px; border-radius:12px;
  background:rgba(18,184,178,.08); color:var(--teal);
  margin-bottom:26px;
}
.biz__ic svg{width:24px; height:24px}
.biz__item h3{font-size:clamp(19px,1.85vw,24px); margin-bottom:12px; color:var(--navy)}
.biz__item p{font-size:15.5px; line-height:1.85; color:var(--fg-2)}
/* 顶部一条随进场展开的线 */
.biz__item::before{
  content:""; position:absolute; left:0; top:0; height:3px; width:0;
  background:var(--teal); transition:width .8s var(--ease);
}
.biz__item.is-in::before{width:100%}

/* ── 03 三步：横向步骤条（与 02 三栏拉开差异）── */
.steps{
  display:grid; grid-template-columns:repeat(3,minmax(0,1fr));
  gap:0; position:relative;
}
/* 贯穿的连接线 */
.steps::before{
  content:""; position:absolute; left:0; right:0; top:23px; height:2px;
  background:linear-gradient(to right, rgba(18,184,178,.35), rgba(18,184,178,.12));
}
.step{position:relative; padding:64px 34px 0 0}
/* 节点圆 */
.step::before{
  content:""; position:absolute; left:0; top:14px;
  width:20px; height:20px; border-radius:50%;
  background:#fff; border:2px solid var(--teal);
  box-shadow:0 0 0 5px rgba(18,184,178,.10);
}
.step__n{
  display:block; font-family:var(--geo); font-size:13px; font-weight:700;
  color:var(--teal-ink); letter-spacing:.16em; margin-bottom:14px;
}
.step__body h3{font-size:clamp(19px,1.8vw,24px); margin-bottom:12px; color:var(--navy)}
.step__body p{font-size:15.5px; line-height:1.85; color:var(--fg-2); max-width:22em}

/* ── 04 表单 ── */
.form{max-width:740px}
.q{border:0; padding:0; margin:0 0 48px}
.q__label{
  display:flex; align-items:baseline; gap:14px;
  font-size:17px; font-weight:800; color:var(--navy);
  margin-bottom:20px; padding:0;
}
.q__n{
  font-family:var(--geo); font-size:13px; color:var(--teal-ink);
  letter-spacing:.1em; font-weight:700;
}
.opts{display:flex; flex-wrap:wrap; gap:12px}
.opt{position:relative}
.opt input{position:absolute; opacity:0; width:0; height:0}
.opt span{
  display:block; padding:13px 28px; border:1.5px solid var(--line);
  border-radius:999px; font-size:15.5px; color:var(--fg-2);
  cursor:pointer; background:#fff;
  transition:border-color .18s, color .18s, background .18s, transform .18s var(--ease);
}
.opt:hover span{border-color:var(--navy-2); color:var(--navy); transform:translateY(-2px)}
.opt input:checked + span{background:var(--navy); border-color:var(--navy); color:#fff}
.opt input:focus-visible + span{outline:2px solid var(--teal-ink); outline-offset:3px}

.q__hint{font-size:13.5px; color:var(--fg-3); margin-top:16px}
.field{margin-top:20px}
.field__label{display:block; font-size:14px; color:var(--fg-2); margin-bottom:10px}
.field input{
  width:100%; max-width:340px; padding:14px 18px;
  border:1.5px solid var(--line); border-radius:10px;
  font-size:15.5px; font-family:inherit; color:var(--navy);
  background:#fff; transition:border-color .2s;
}
.field input:focus{outline:none; border-color:var(--teal-ink)}
/* 占位符是用户看得到的提示文本，同样按 4.5:1 约束 */
.field input::placeholder{color:var(--fg-3); opacity:1}

.btn{
  font-family:inherit; font-size:16px; font-weight:700; letter-spacing:.02em;
  color:#fff; background:var(--navy); border:0;
  padding:18px 64px; border-radius:999px; cursor:pointer;
  transition:background .22s, transform .22s var(--ease), box-shadow .22s;
}
.btn:hover{background:var(--teal-ink); transform:translateY(-2px);
  box-shadow:0 12px 30px rgba(18,184,178,.3)}
.btn:active{transform:translateY(0)}
.ack{margin-top:22px; font-size:16px; color:var(--teal-ink); font-weight:700}

/* ══ 页脚 ══ */
.foot{border-top:1px solid var(--line-2); padding:52px 0}
.foot__in{display:flex; align-items:center}
.foot__in img{height:54px; width:auto}

/* ══════════════════════════════════════════════════
   动效：文字逐行浮现 + 错峰交错
   ══════════════════════════════════════════════════ */
html.js .reveal{
  opacity:0; transform:translateY(26px);
  transition:opacity .75s var(--ease), transform .75s var(--ease);
}
html.js .reveal.is-in{opacity:1; transform:none}

/* 首屏标题：分两行错峰，每行从下方滑入并轻微放大 */
html.js .hero__title span{
  display:block; opacity:0; transform:translateY(30px);
  transition:opacity .9s var(--ease), transform .9s var(--ease);
}
html.js .hero__title span:nth-child(1){transition-delay:.12s}
html.js .hero__title span:nth-child(2){transition-delay:.32s}
html.js .hero.is-in .hero__title span{opacity:1; transform:none}

/* 副标题延后 */
html.js .hero__sub{
  opacity:0; transform:translateY(18px);
  transition:opacity .8s var(--ease) .5s, transform .8s var(--ease) .5s;
}
html.js .hero.is-in .hero__sub{opacity:1; transform:none}

/* 首屏插画：从左侧浮入 + 轻微缩放 */
html.js .hero__art{
  opacity:0; transform:translateX(-34px) scale(.97);
  transition:opacity 1.05s var(--ease), transform 1.05s var(--ease);
}
html.js .hero.is-in .hero__art{opacity:1; transform:none}

/* 四条：逐条错峰（全站最强节奏） */
html.js .facts__row:nth-child(1){transition-delay:0ms}
html.js .facts__row:nth-child(2){transition-delay:110ms}
html.js .facts__row:nth-child(3){transition-delay:220ms}
html.js .facts__row:nth-child(4){transition-delay:330ms}

/* 业务 / 步骤：错峰 + 顶线展开 */
html.js .biz__item:nth-child(2), html.js .step:nth-child(2){transition-delay:120ms}
html.js .biz__item:nth-child(3), html.js .step:nth-child(3){transition-delay:240ms}

/* ══ 响应式 ══ */
@media (max-width:1024px){
  .wrap{padding:0 28px}
  .hero{padding:48px 0 72px}
  .hero__grid{grid-template-columns:1fr; gap:36px}
  .hero__art{order:2}          /* 移动端插画在文案下方 */
  .sec{padding:82px 0}
  .biz{grid-template-columns:1fr; gap:0; border-bottom:0}
  .biz__item{border-bottom:1px solid var(--line); padding:40px 0}
  .steps{grid-template-columns:1fr; gap:0}
  /* 移动端：连接线改纵向 */
  .steps::before{
    left:9px; right:auto; top:0; bottom:0; width:2px; height:auto;
    background:linear-gradient(to bottom, rgba(18,184,178,.35), rgba(18,184,178,.10));
  }
  .step{padding:32px 0 32px 40px}
  .step::before{left:0; top:40px}
}

/* ══ 移动端：隐藏顶部导航 ══ */
@media (max-width:768px){
  .nav{display:none}
  .foot{padding-top:44px}
}

@media (max-width:640px){
  .wrap{padding:0 20px}
  .hero{padding:36px 0 56px}
  .hero__title{font-size:clamp(30px,8.6vw,40px)}
  .hero__sub{margin-top:22px; font-size:15.5px}
  .sec{padding:60px 0}
  .kicker{margin-bottom:24px}
  .h2{margin-bottom:36px}
  .facts__row{grid-template-columns:40px 1fr; gap:16px; padding:24px 0}
  .facts__t{font-size:20px}
  .opt span{padding:12px 22px; font-size:15px}
  .btn{width:100%; padding:17px 0}
  .foot__in{flex-direction:column; align-items:flex-start; gap:14px}
}

/* ══ 减少动效 ══ */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  html.js .reveal,
  html.js .hero__title span,
  html.js .hero__sub,
  html.js .hero__art{
    opacity:1 !important; transform:none !important; transition:none !important;
  }
  html.js .facts__row, html.js .biz__item, html.js .step{transition-delay:0ms !important}
  html.js .biz__item::before{width:100% !important; transition:none !important}
  *{transition-duration:.01ms !important; animation-duration:.01ms !important}
}