/* ==========================================================================
   壹贰科技有限公司 OneTwo Technology Limited — 官网样式表
   设计方向：编辑部 / 作品集风格
   规则：不用渐变、不用发光、不用毛玻璃，圆角一律为 0，
        靠发丝线、超大字号和不对称栅格撑版式。
   改配色：改下面 :root 里的变量即可。
   ========================================================================== */

:root{
  /* ---- 配色 ---- */
  --paper:      #F2EFE9;   /* 纸感底色 */
  --paper-2:    #E8E4DA;   /* 次级底色（悬停用） */
  --ink:        #14140F;   /* 墨色（文字 / 深色区块） */
  --ink-soft:   #3C3C34;   /* 正文灰 */
  --muted:      #6E6C63;   /* 弱化文字 */
  --accent:     #FF4A1C;   /* 唯一强调色：朱红 */

  --rule:       rgba(20,20,15,.16);   /* 发丝线（浅底） */
  --rule-2:     rgba(20,20,15,.30);
  --on-ink:        #EDEAE3;           /* 深色区块上的文字 */
  --on-ink-soft:   rgba(237,234,227,.66);
  --rule-dark:     rgba(237,234,227,.18);

  /* ---- 字体 ---- */
  --sans: "Archivo","Noto Sans SC",-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  --mono: "IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  /* ---- 尺寸 ---- */
  --maxw: 1240px;
  --pad:  clamp(20px, 4vw, 40px);
  --head-h: 78px;
}

*,*::before,*::after{ box-sizing:border-box; }

html{
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--head-h) + 20px);
  -webkit-text-size-adjust:100%;
}

body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
h1,h2,h3{ margin:0; line-height:1.1; letter-spacing:-.025em; font-weight:800; }
p{ margin:0; }
ul,ol,dl{ margin:0; padding:0; list-style:none; }
button{ font-family:inherit; cursor:pointer; }

.wrap{ width:100%; max-width:var(--maxw); margin:0 auto; padding:0 var(--pad); }

/* 等宽小标签：序号、字段名、元信息统一用它 */
.mono{
  font-family:var(--mono);
  font-size:.72rem;
  font-weight:500;
  letter-spacing:.1em;
  text-transform:uppercase;
}

/* ============================ 顶部导航 ============================ */
.site-head{
  position:fixed; inset:0 0 auto 0; z-index:80;
  height:var(--head-h);
  display:flex; align-items:center;
  background:var(--paper);
  border-bottom:1px solid transparent;
  transition:border-color .3s;
}
.site-head.is-stuck{ border-bottom-color:var(--rule); }

.head-inner{ display:flex; align-items:center; gap:32px; }

.brand{ flex:none; display:flex; flex-direction:column; gap:2px; }
.brand-cn{ font-size:19px; font-weight:800; letter-spacing:-.01em; line-height:1.1; }
.brand-en{ font-size:9px; color:var(--muted); letter-spacing:.14em; line-height:1; }

.nav{ display:flex; align-items:center; gap:26px; margin-left:auto; }
.nav a{
  position:relative;
  font-size:14.5px; font-weight:500; color:var(--ink-soft);
  padding:4px 0;
  transition:color .2s;
}
.nav a::after{
  content:""; position:absolute; left:0; right:0; bottom:0;
  height:1px; background:var(--accent);
  transform:scaleX(0); transform-origin:left;
  transition:transform .28s cubic-bezier(.22,1,.36,1);
}
.nav a:hover{ color:var(--ink); }
.nav a:hover::after{ transform:scaleX(1); }

.head-actions{ display:flex; align-items:center; gap:12px; flex:none; }

.lang-btn{
  height:40px; padding:0 14px;
  background:transparent;
  border:1px solid var(--rule-2);
  border-radius:0;
  color:var(--ink); font-size:.72rem; letter-spacing:.12em;
  transition:.2s;
}
.lang-btn:hover{ background:var(--ink); color:var(--paper); border-color:var(--ink); }

.menu-btn{
  display:none;
  width:42px; height:40px;
  background:transparent; border:1px solid var(--rule-2); border-radius:0;
  position:relative; padding:0;
}
.menu-btn i{
  position:absolute; left:12px; right:12px; height:1.5px;
  background:var(--ink); transition:.25s;
}
.menu-btn i:nth-child(1){ top:15px; }
.menu-btn i:nth-child(2){ top:23px; }
.menu-btn.is-open i:nth-child(1){ transform:translateY(4px) rotate(45deg); }
.menu-btn.is-open i:nth-child(2){ transform:translateY(-4px) rotate(-45deg); }

/* ============================ 按钮：一律直角 ============================ */
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  height:52px; padding:0 28px;
  border:1px solid transparent; border-radius:0;
  font-size:15px; font-weight:600; letter-spacing:.01em;
  transition:background .22s, color .22s, border-color .22s;
  white-space:nowrap;
}
.btn-sm{ height:40px; padding:0 18px; font-size:14px; }
.btn-block{ width:100%; }

.btn-solid{ background:var(--ink); color:var(--paper); }
.btn-solid:hover{ background:var(--accent); color:#fff; }

.btn-line{ background:transparent; color:var(--ink); border-color:var(--ink); }
.btn-line:hover{ background:var(--ink); color:var(--paper); }

.btn-ink{ background:var(--ink); color:#fff; }
.btn-ink:hover{ background:#fff; color:var(--ink); }

/* ============================ HERO ============================ */
.hero{ padding:calc(var(--head-h) + 68px) 0 0; }

.hero-top{
  display:flex; align-items:baseline; gap:24px;
  padding-bottom:14px;
  border-bottom:1px solid var(--ink);
  color:var(--muted);
}
.hero-top-mid{ margin-left:auto; color:var(--ink); }

.hero-title{
  margin-top:38px;
  font-size:clamp(54px,12vw,168px);
  font-weight:900;
  letter-spacing:-.05em;
  line-height:.86;
}
.hero-title span{ display:block; }
.hero-title-em{ color:var(--accent); }

.hero-en{
  margin-top:26px;
  font-size:.74rem; letter-spacing:.22em; color:var(--muted);
}

.hero-cols{
  display:grid;
  grid-template-columns:minmax(0,1fr) auto;
  gap:48px; align-items:end;
  margin-top:56px;
}
.hero-sub{
  max-width:56ch;
  font-size:17px; line-height:1.8; color:var(--ink-soft);
}
.hero-cta{ display:flex; gap:12px; flex-wrap:wrap; }

/* 数据表：顶线 + 竖分隔线，不使用卡片 */
.stat-table{
  display:grid; grid-template-columns:repeat(4,minmax(0,1fr));
  margin-top:88px;
  border-top:1px solid var(--ink);
}
.stat-table li{ padding:26px 0 12px; }
.stat-table li + li{ border-left:1px solid var(--rule); padding-left:32px; }

.stat-val{
  display:flex; align-items:baseline;
  font-size:clamp(30px,3.8vw,52px);
  font-weight:800; letter-spacing:-.035em; line-height:1;
}
.stat-unit{ font-style:normal; font-size:.44em; font-weight:600; margin-left:3px; }
.stat-key{ display:block; margin-top:8px; font-size:13.5px; color:var(--muted); }

/* ============================ 滚动字带 ============================ */
.ticker{
  margin-top:88px;
  background:var(--ink); color:var(--on-ink);
  padding:20px 0; overflow:hidden;
}
.ticker-track{
  display:flex; align-items:center; gap:30px;
  width:max-content;
  animation:marquee 46s linear infinite;
}
.ticker-track span{
  font-family:var(--mono); font-size:.74rem;
  letter-spacing:.16em; text-transform:uppercase;
  white-space:nowrap;
}
.ticker-track i{
  flex:none; width:7px; height:7px;
  background:var(--accent); transform:rotate(45deg);
}
@keyframes marquee{ from{ transform:translateX(0); } to{ transform:translateX(-50%); } }

/* ============================ 区块骨架 ============================ */
.section{ padding:118px 0; }
.section-rule{ border-top:1px solid var(--rule); }
.section-ink{ background:var(--ink); color:var(--on-ink); }

.sec-head{ display:flex; align-items:baseline; gap:16px; margin-bottom:34px; }
.sec-num{ font-size:.75rem; color:var(--accent); }
.sec-label{ font-size:.75rem; color:var(--muted); }
.sec-head-dark .sec-label{ color:var(--on-ink-soft); }

.sec-title{
  font-size:clamp(34px,4.6vw,64px);
  font-weight:800; letter-spacing:-.04em;
  max-width:22ch; margin-bottom:52px;
}
.sec-note{
  margin:-32px 0 52px;
  max-width:62ch;
  font-size:14.5px; color:var(--muted);
}
.section-ink .sec-note{ color:var(--on-ink-soft); }

/* 左右分栏（关于我们 / 联系我们） */
.split{
  display:grid;
  grid-template-columns:minmax(0,.92fr) minmax(0,1.08fr);
  gap:clamp(40px,6vw,84px);
  align-items:start;
}
.split-lead h2{
  font-size:clamp(30px,4vw,54px);
  letter-spacing:-.04em; line-height:1.08;
  position:sticky; top:calc(var(--head-h) + 24px);
}
.split-body p{
  max-width:60ch;
  font-size:16.5px; line-height:1.85; color:var(--ink-soft);
  margin-bottom:22px;
}

/* 编号列表 */
.num-list{ margin-top:44px; border-top:1px solid var(--rule); }
.num-list li{
  display:grid; grid-template-columns:58px minmax(0,1fr); gap:18px;
  padding:22px 0; border-bottom:1px solid var(--rule);
}
.num-list .mono{ color:var(--accent); padding-top:3px; }
.num-list strong{ display:block; font-size:16.5px; font-weight:700; margin-bottom:5px; }
.num-list div > span{ font-size:15px; line-height:1.75; color:var(--ink-soft); }

/* ============================ 服务清单 ============================ */
.svc-list{ border-top:1px solid var(--rule); }
.svc-list li{
  display:grid;
  grid-template-columns:74px minmax(0,.86fr) minmax(0,1.14fr);
  gap:clamp(20px,3vw,44px);
  align-items:baseline;
  padding:30px 22px;
  margin:0 -22px;
  border-bottom:1px solid var(--rule);
  transition:background .24s, color .24s;
}
.svc-num{ color:var(--accent); }
.svc-list h3{ font-size:clamp(19px,2.1vw,27px); font-weight:700; letter-spacing:-.025em; }
.svc-list p{ font-size:15.5px; line-height:1.75; color:var(--ink-soft); transition:color .24s; }

.svc-list li:hover{ background:var(--accent); }
.svc-list li:hover h3,
.svc-list li:hover p,
.svc-list li:hover .svc-num{ color:#fff; }

/* ============================ 产品展示（深色区块） ============================ */
.showcase{ border-top:1px solid var(--rule-dark); padding-top:44px; }

.show-head{
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto;
  gap:clamp(24px,3vw,44px);
  align-items:center;
}
.show-icon{ width:112px; height:112px; flex:none; }
.show-name h3{ font-size:clamp(28px,4vw,52px); font-weight:800; letter-spacing:-.03em; }
.show-name em{
  display:block; margin-top:8px; font-style:normal;
  font-size:.72rem; color:var(--on-ink-soft); letter-spacing:.14em;
}
.show-name p{
  margin-top:14px; max-width:52ch;
  font-size:15.5px; line-height:1.75; color:var(--on-ink-soft);
}

/* 产品元信息条：五格数据，发丝线分隔 */
.show-meta{
  display:grid; grid-template-columns:repeat(5,minmax(0,1fr));
  margin-top:44px;
  border-top:1px solid var(--rule-dark); border-bottom:1px solid var(--rule-dark);
}
.show-meta li{ padding:20px 18px 20px 0; }
.show-meta li + li{ border-left:1px solid var(--rule-dark); padding-left:22px; }
.show-meta span{
  display:block; margin-bottom:8px;
  font-size:.64rem; color:var(--on-ink-soft); letter-spacing:.1em;
}
.show-meta strong{ font-size:.78rem; font-weight:700; letter-spacing:.06em; }

.shot-strip{
  display:grid; grid-template-columns:repeat(4,minmax(0,1fr));
  gap:clamp(14px,2vw,24px);
  margin-top:44px;
}
.shot-strip img{ width:100%; height:auto; border:1px solid var(--rule-dark); }

/* ============================ 合作流程 ============================ */
.step-list{ border-top:1px solid var(--rule); }
.step-list li{
  display:grid; grid-template-columns:150px minmax(0,1fr);
  gap:clamp(24px,4vw,64px);
  padding:44px 0;
  border-bottom:1px solid var(--rule);
  align-items:start;
}
.step-num{ color:var(--accent); font-size:.8rem; padding-top:9px; }
.step-body h3{ font-size:clamp(24px,3vw,40px); font-weight:800; letter-spacing:-.03em; }
.step-body p{
  margin-top:14px; max-width:68ch;
  font-size:15.5px; line-height:1.8; color:var(--ink-soft);
}

/* ============================ 提测清单 / FAQ ============================ */
.check-list{ border-top:1px solid var(--rule); }
.check-list li{
  display:grid; grid-template-columns:74px minmax(0,1fr);
  gap:clamp(18px,3vw,40px);
  padding:26px 0;
  border-bottom:1px solid var(--rule);
}
.check-list .mono{ color:var(--accent); padding-top:4px; }
.check-list strong{ display:block; margin-bottom:6px; font-size:18px; font-weight:700; }
.check-list span{ font-size:15px; line-height:1.7; color:var(--ink-soft); }

.faq-list{ border-top:1px solid var(--rule); }
.faq-list li{ padding:30px 0; border-bottom:1px solid var(--rule); }
.faq-list h3{ font-size:clamp(18px,2vw,24px); font-weight:700; letter-spacing:-.02em; }
.faq-list p{
  margin-top:12px; max-width:70ch;
  font-size:15.5px; line-height:1.8; color:var(--ink-soft);
}

/* ============================ CTA 色带 ============================ */
.cta-band{ background:var(--accent); color:#fff; padding:84px 0; }
.cta-inner{
  display:grid;
  grid-template-columns:minmax(0,1.3fr) minmax(0,.7fr);
  gap:clamp(32px,5vw,72px);
  align-items:end;
}
.cta-inner h2{
  font-size:clamp(34px,5.2vw,74px);
  font-weight:900; letter-spacing:-.045em; line-height:.98;
  color:#fff;
}
.cta-side p{ margin-bottom:26px; font-size:16px; line-height:1.7; color:rgba(255,255,255,.88); }

/* ============================ 页头（合作页） ============================ */
.page-hero{ padding:calc(var(--head-h) + 68px) 0 0; }
.page-title{
  margin-top:38px;
  font-size:clamp(44px,8.5vw,118px);
  font-weight:900; letter-spacing:-.05em; line-height:.9;
}
.page-title span{ display:block; }
.page-sub{
  margin-top:34px; max-width:62ch;
  font-size:17px; line-height:1.8; color:var(--ink-soft);
}

.contact-cta{ margin-top:34px; }
.foot-note{ margin-top:2px; font-size:.62rem; color:var(--on-ink-soft); letter-spacing:.12em; }

/* ============================ 联系 ============================ */
.contact-dl{ margin-top:44px; border-top:1px solid var(--rule); }
.contact-dl > div{
  display:grid; grid-template-columns:146px minmax(0,1fr); gap:24px;
  padding:17px 0; border-bottom:1px solid var(--rule);
}
.contact-dl dt{ font-size:.68rem; color:var(--muted); padding-top:5px; }
.contact-dl dd{ margin:0; font-size:15.5px; line-height:1.6; }
.contact-dl a{ border-bottom:1px solid var(--rule-2); transition:color .2s, border-color .2s; }
.contact-dl a:hover{ color:var(--accent); border-color:var(--accent); }

/* 表单：下划线式输入框 */
.form{ border-top:1px solid var(--ink); padding-top:34px; }
.form label{ display:block; margin-bottom:28px; }
.form label > span{
  display:block; margin-bottom:10px;
  font-size:.68rem; color:var(--muted); letter-spacing:.12em;
}
.form input,.form select,.form textarea{
  width:100%;
  padding:11px 0;
  background:transparent;
  border:0; border-bottom:1px solid var(--rule-2); border-radius:0;
  color:var(--ink); font-family:inherit; font-size:16px;
  transition:border-color .2s;
}
.form textarea{ resize:vertical; min-height:112px; line-height:1.7; }
.form input::placeholder,.form textarea::placeholder{ color:rgba(110,108,99,.7); }
.form input:focus,.form select:focus,.form textarea:focus{
  outline:none; border-bottom-color:var(--accent);
}
.form input.is-error{ border-bottom-color:#C0392B; }
.f-row{ display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:34px; }
.form .btn{ margin-top:12px; }
.form-hint{ margin-top:18px; font-size:.66rem; line-height:1.7; color:var(--muted); }

/* ============================ 页脚 ============================ */
.site-foot{ background:var(--ink); color:var(--on-ink); padding:76px 0 34px; }

/* 巨型字标：用 space-between 让字母铺满整行，不依赖字体度量 */
.foot-word{
  display:flex; justify-content:space-between;
  font-weight:900; font-size:clamp(46px,14.5vw,180px);
  line-height:.78; letter-spacing:-.03em;
  user-select:none;
  margin-bottom:76px;
}

.foot-grid{
  display:grid; grid-template-columns:repeat(4,minmax(0,1fr));
  gap:40px;
  padding-top:40px; border-top:1px solid var(--rule-dark);
}
.foot-h{ display:block; margin-bottom:20px; font-size:.66rem; color:rgba(237,234,227,.5); }
.foot-col p,.foot-col a{
  display:block; margin-bottom:9px;
  font-size:14.5px; line-height:1.6; color:rgba(237,234,227,.82);
  transition:color .2s;
}
.foot-col a:hover{ color:var(--accent); }

.foot-bottom{
  display:flex; justify-content:space-between; gap:20px; flex-wrap:wrap;
  margin-top:60px; padding-top:24px;
  border-top:1px solid var(--rule-dark);
  font-size:.64rem; color:rgba(237,234,227,.45);
}

/* ============================ 回到顶部 / 提示 ============================ */
.to-top{
  position:fixed; right:24px; bottom:24px; z-index:70;
  height:42px; padding:0 16px;
  background:var(--paper); border:1px solid var(--rule-2); border-radius:0;
  color:var(--ink); font-size:.64rem; letter-spacing:.14em;
  opacity:0; visibility:hidden; transform:translateY(8px);
  transition:.26s;
}
.to-top.is-on{ opacity:1; visibility:visible; transform:none; }
.to-top:hover{ background:var(--ink); color:var(--paper); border-color:var(--ink); }

.toast{
  position:fixed; left:50%; bottom:34px; z-index:90;
  transform:translate(-50%,12px);
  max-width:calc(100% - 40px);
  padding:14px 24px;
  background:var(--ink); color:var(--paper);
  border-radius:0;
  font-size:14.2px; text-align:center;
  opacity:0; visibility:hidden; transition:.26s;
}
.toast.is-on{ opacity:1; visibility:visible; transform:translate(-50%,0); }

/* ============================ 首屏入场 ============================ */
/* 只给首屏一次轻微上浮，不做滚动触发动效——少一点装饰，页面也更稳 */
@keyframes rise{ from{ opacity:0; transform:translateY(18px); } to{ opacity:1; transform:none; } }

.hero-top,.hero-title,.hero-en,.hero-cols,.stat-table{
  animation:rise .8s cubic-bezier(.22,1,.36,1) both;
}
.hero-top{ animation-delay:.05s; }
.hero-title{ animation-delay:.14s; }
.hero-en{ animation-delay:.24s; }
.hero-cols{ animation-delay:.32s; }
.stat-table{ animation-delay:.42s; }

@media (prefers-reduced-motion:reduce){
  html{ scroll-behavior:auto; }
  .hero-top,.hero-title,.hero-en,.hero-cols,.stat-table{ animation:none; }
  .ticker-track{ animation:none; }
  *{ animation-duration:.001ms !important; transition-duration:.001ms !important; }
}

/* ============================ 响应式 ============================ */
@media (max-width:1080px){
  .split{ grid-template-columns:1fr; gap:40px; }
  .split-lead h2{ position:static; }
  .hero-cols{ grid-template-columns:1fr; align-items:start; }
  .cta-inner{ grid-template-columns:1fr; align-items:start; }
  .foot-grid{ grid-template-columns:repeat(2,minmax(0,1fr)); gap:36px; }
  .section{ padding:94px 0; }

  .svc-list li{ grid-template-columns:52px minmax(0,1fr); gap:8px 18px; }
  .svc-list p{ grid-column:2; }

  .show-head{ grid-template-columns:auto minmax(0,1fr); }
  .show-head .btn{ grid-column:2; justify-self:start; }
  .show-meta{ grid-template-columns:repeat(2,minmax(0,1fr)); }
  .show-meta li + li{ border-left:0; padding-left:0; }
  .show-meta li:nth-child(even){ border-left:1px solid var(--rule-dark); padding-left:22px; }
  .shot-strip{ grid-template-columns:repeat(2,minmax(0,1fr)); }

  .step-list li{ grid-template-columns:1fr; gap:10px; padding:32px 0; }
}

@media (max-width:860px){
  :root{ --head-h:68px; }

  .nav{
    position:fixed; left:0; right:0; top:var(--head-h);
    flex-direction:column; align-items:stretch; gap:0;
    margin:0; padding:8px var(--pad) 24px;
    background:var(--paper);
    border-bottom:1px solid var(--rule);
    transform:translateY(-10px); opacity:0; visibility:hidden;
    transition:.24s;
  }
  .nav.is-open{ transform:none; opacity:1; visibility:visible; }
  .nav a{ padding:15px 0; font-size:17px; border-bottom:1px solid var(--rule); }
  .nav a::after{ display:none; }

  .menu-btn{ display:block; }
  .head-actions .btn-sm{ display:none; }

  .hero{ padding-top:calc(var(--head-h) + 42px); }
  .hero-top-mid{ display:none; }
  .hero-title{ font-size:clamp(46px,16vw,96px); }

  .stat-table{ grid-template-columns:repeat(2,minmax(0,1fr)); margin-top:64px; }
  .stat-table li{ padding:22px 0; }
  .stat-table li + li{ border-left:0; padding-left:0; }
  .stat-table li:nth-child(even){ border-left:1px solid var(--rule); padding-left:26px; }
  .stat-table li:nth-child(n+3){ border-top:1px solid var(--rule); }

  .ticker{ margin-top:64px; }

  .page-title{ font-size:clamp(38px,11vw,72px); }

  .show-icon{ width:72px; height:72px; }
  .show-meta{ grid-template-columns:1fr; }
  .show-meta li:nth-child(even){ border-left:0; padding-left:0; }
  .shot-strip{ gap:12px; }

  .check-list li{ grid-template-columns:52px minmax(0,1fr); gap:14px; }
  .step-list li{ padding:26px 0; }

  .contact-dl > div{ grid-template-columns:1fr; gap:4px; }
  .contact-dl dt{ padding-top:0; }

  .f-row{ grid-template-columns:1fr; gap:0; }

  .svc-list li{ padding:24px 16px; margin:0 -16px; }

  .foot-word{ font-size:clamp(40px,17vw,80px); margin-bottom:56px; }
  .foot-grid{ grid-template-columns:1fr 1fr; }
  .foot-bottom{ flex-direction:column; gap:8px; }

  .section{ padding:78px 0; }
}