/* ================================================================
   common.css — 公共样式（所有页面共享）
   ================================================================ */

/* ============ 设计变量 ============ */
:root{
  --c-ink:#0f1a28;        /* 最深底色 */
  --c-navy:#1b2a3e;       /* 主色 深藏青 */
  --c-navy-2:#243655;     /* 次深 */
  --c-gold:#c4965b;       /* 点缀金 */
  --c-gold-d:#a87a3f;     /* 金hover */
  --c-line:#e2e5ea;       /* 分隔线 */
  --c-bg:#f6f7f9;         /* 浅底 */
  --c-bg-2:#eef0f3;
  --c-text:#1f2733;       /* 正文深 */
  --c-mute:#6b7480;       /* 次要文字 */
  --c-white:#ffffff;
  --maxw:1440px;          /* 页面最大宽度 */
  --t:.28s;
}

/* ============ 重置 ============ */
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--c-text);
  background:var(--c-white);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
ul{list-style:none}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 32px}
.sharp{border-radius:0}

/* ============ 顶部信息条 ============ */
.topbar{
  background:var(--c-ink);
  color:#9aa6b5;
  font-size:12.5px;
  letter-spacing:.02em;
}
.topbar .wrap{display:flex;justify-content:space-between;align-items:center;height:38px}
.topbar .tb-left{display:flex;gap:26px}
.topbar .tb-left span b{color:var(--c-gold);font-weight:600;margin-right:6px}
.lang-switch{display:flex;align-items:center;gap:0}
.lang-switch .lbl{color:#7f8c9e;margin-right:10px}
.lang-switch button{
  background:transparent;border:1px solid #2c3a4f;color:#9aa6b5;
  padding:4px 9px;font-size:11.5px;letter-spacing:.06em;cursor:pointer;
  border-right:none;font-family:inherit;font-weight:600;transition:var(--t);
}
.lang-switch button:last-child{border-right:1px solid #2c3a4f}
.lang-switch button:hover{background:var(--c-gold);color:#0f1a28;border-color:var(--c-gold)}
.lang-switch button.active{background:var(--c-gold);color:#0f1a28;border-color:var(--c-gold)}

/* ============ 主导航 ============ */
.header{
  background:rgba(255,255,255,.98);
  border-bottom:1px solid var(--c-line);
  position:sticky;top:0;z-index:100;
  box-shadow:0 1px 0 rgba(0,0,0,.02);
}
.header .wrap{display:flex;align-items:center;justify-content:space-between;height:74px}
.logo{display:flex;align-items:center;gap:12px;font-weight:800;letter-spacing:.04em}
.logo .mark{
  width:38px;height:38px;background:var(--c-navy);position:relative;
  display:flex;align-items:center;justify-content:center;
}
.logo .mark::after{
  content:"";position:absolute;top:0;right:0;
  width:0;height:0;border-style:solid;border-width:0 11px 11px 0;
  border-color:transparent var(--c-gold) transparent transparent;
}
.logo .mark span{color:var(--c-gold);font-size:18px;font-weight:900}
.logo .name{font-size:20px;color:var(--c-navy)}
.logo .name em{color:var(--c-gold);font-style:normal}
.nav{display:flex;align-items:center;gap:4px}
.nav a{
  padding:10px 16px;font-size:14.5px;font-weight:600;color:var(--c-text);
  letter-spacing:.02em;position:relative;transition:var(--t);
}
.nav a::after{
  content:"";position:absolute;left:16px;right:16px;bottom:4px;height:2px;
  background:var(--c-gold);transform:scaleX(0);transform-origin:left;transition:var(--t);
}
.nav a:hover{color:var(--c-navy)}
.nav a:hover::after{transform:scaleX(1)}
.nav a.active{color:var(--c-navy)}
.nav a.active::after{transform:scaleX(1)}
/* Products 下拉菜单（棱角分明，无圆角） */
.nav .has-drop{position:relative}
.nav .has-drop>a::after{transform-origin:left}
.nav .drop{
  position:absolute;top:100%;left:0;min-width:230px;
  background:#fff;border:1.5px solid var(--c-line);border-top:2px solid var(--c-gold);
  box-shadow:0 12px 30px rgba(15,26,40,.14);
  padding:6px 0;
  opacity:0;visibility:hidden;transform:translateY(8px);
  transition:var(--t);z-index:50;
}
.nav .has-drop:hover .drop{opacity:1;visibility:visible;transform:translateY(0)}
.nav .drop a{
  display:block;padding:11px 20px;font-size:13.5px;font-weight:600;
  color:var(--c-text);letter-spacing:0;
  border-bottom:1px solid var(--c-bg);
}
.nav .drop a:last-child{border-bottom:none}
.nav .drop a::after{display:none}
.nav .drop a:hover,.nav .drop a.active{background:var(--c-bg);color:var(--c-gold-d)}
/* 移动端隐藏下拉（移动端导航整体隐藏） */
@media(max-width:768px){ .nav .drop{display:none} }
.btn-quote{
  background:var(--c-gold);color:#0f1a28;border:none;cursor:pointer;
  padding:12px 26px;font-size:14px;font-weight:700;letter-spacing:.04em;
  font-family:inherit;transition:var(--t);clip-path:polygon(0 0,100% 0,100% 100%,8% 100%);
}
.btn-quote:hover{background:var(--c-gold-d);color:#fff}

/* ============ 按钮基础 ============ */
.btn{
  display:inline-flex;align-items:center;gap:10px;font-weight:700;letter-spacing:.04em;
  font-size:14.5px;padding:15px 30px;cursor:pointer;border:none;font-family:inherit;transition:var(--t);
}
.btn-primary{background:var(--c-gold);color:#0f1a28;clip-path:polygon(0 0,100% 0,100% 100%,8% 100%)}
.btn-primary:hover{background:#fff}
.btn-ghost{background:transparent;color:#fff;border:1.5px solid rgba(255,255,255,.4)}
.btn-ghost:hover{border-color:var(--c-gold);color:var(--c-gold)}

/* ============ 区块标题（公共） ============ */
.section{padding:84px 0}
.section.bg-soft{background:var(--c-bg)}
.sec-head{margin-bottom:50px;max-width:680px}
.sec-head .kicker{
  color:var(--c-gold);font-size:12.5px;font-weight:700;letter-spacing:.18em;
  text-transform:uppercase;display:flex;align-items:center;gap:12px;margin-bottom:14px;
}
.sec-head .kicker::before{content:"";width:30px;height:2px;background:var(--c-gold)}
.sec-head h2{font-size:34px;font-weight:800;color:var(--c-navy);letter-spacing:-.01em;line-height:1.2}
.sec-head p{color:var(--c-mute);font-size:15.5px;margin-top:14px}

/* ============ 页脚 ============ */
.footer{background:var(--c-ink);color:#9aa6b5;padding:64px 0 0}
.footer .grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:40px;padding-bottom:48px;border-bottom:1px solid #1d2b3d}
.footer .f-about .logo .name{color:#fff}
.footer .f-about p{font-size:13.5px;margin:18px 0;line-height:1.7;max-width:300px}
.footer .f-about .socials{display:flex;gap:10px}
.footer .f-about .socials a{
  width:38px;height:38px;border:1px solid #2c3a4f;display:flex;align-items:center;justify-content:center;
  font-size:13px;font-weight:700;transition:var(--t);
}
.footer .f-about .socials a:hover{background:var(--c-gold);border-color:var(--c-gold);color:#0f1a28}
.footer h5{color:#fff;font-size:14px;font-weight:700;letter-spacing:.06em;margin-bottom:20px;text-transform:uppercase}
.footer h5::before{content:"";display:block;width:24px;height:2px;background:var(--c-gold);margin-bottom:14px}
.footer ul li{margin-bottom:11px}
.footer ul li a{font-size:13.5px;transition:var(--t)}
.footer ul li a:hover{color:var(--c-gold);padding-left:5px}
.footer .f-contact .row{display:flex;gap:10px;margin-bottom:14px;font-size:13.5px;align-items:flex-start}
.footer .f-contact .row .ic{color:var(--c-gold);font-weight:700;flex-shrink:0}
.footer .bottom{padding:22px 0;display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap}
.footer .bottom p{font-size:12.5px;color:#6b7785}

/* ============ 右下浮动组件 ============ */
.fab{
  position:fixed;left:auto;right:24px;bottom:40px;z-index:999;
  display:flex;flex-direction:column;gap:10px;
  opacity:0;visibility:hidden;pointer-events:none;
  transform:translateY(20px);
  transition:opacity .4s ease, transform .4s ease, visibility .4s;
}
.fab.visible{
  opacity:1;visibility:visible;pointer-events:auto;transform:translateY(0);
}
.fab .item{
  width:48px;height:48px;background:#fff;border:1.5px solid var(--c-line);
  display:flex;align-items:center;justify-content:center;cursor:pointer;
  transition:var(--t);position:relative;font-size:18px;color:var(--c-navy);
  box-shadow:0 2px 10px rgba(15,26,40,.08);
}
.fab .item:hover{background:var(--c-navy);color:var(--c-gold);border-color:var(--c-navy)}
.fab .item .ic{font-weight:700;line-height:1}

.fab .lang-item{position:relative}
/* 语言面板向上展开，避免底部被截断 */
.fab .lang-panel{
  position:absolute;left:auto;right:58px;bottom:-2px;
  background:#fff;border:1.5px solid var(--c-line);
  min-width:220px;box-shadow:0 8px 24px rgba(15,26,40,.12);
  opacity:0;visibility:hidden;transform:translateX(8px);
  transition:var(--t);padding:6px 0;
}
.fab .lang-panel::after{
  content:"";position:absolute;right:-6px;bottom:18px;
  border:6px solid transparent;border-left-color:#fff;
}
.fab .lang-item:hover .lang-panel{opacity:1;visibility:visible;transform:translateX(0)}
.fab .lang-panel button{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:10px;
  padding:10px 16px;background:transparent;border:none;cursor:pointer;font-family:inherit;
  font-size:13.5px;color:var(--c-text);text-align:left;transition:var(--t);
  white-space:nowrap;flex-wrap:nowrap;
}
.fab .lang-panel button:hover{background:var(--c-bg);color:var(--c-gold-d)}
.fab .lang-panel button.active{color:var(--c-gold-d);font-weight:700;background:var(--c-bg)}
.fab .lang-panel button .code{font-size:11px;color:var(--c-mute);letter-spacing:.05em}
.fab .lang-panel button.active .code{color:var(--c-gold-d)}

/* ============ 公共响应式 ============ */
@media(max-width:768px){
  .wrap{padding:0 20px}
  .topbar .tb-left span:not(:first-child){display:none}
  .nav{display:none}
  .section{padding:60px 0}
  .sec-head h2{font-size:26px}
  .footer .grid{grid-template-columns:1fr 1fr;gap:32px}
  .fab{left:auto;right:14px;bottom:30px;gap:8px}
  .fab .item{width:44px;height:44px;font-size:16px}
  .fab .lang-panel{left:auto;right:56px}
}

/* ============ 字符截断提示 ============ */
/* 截断超长输入时显示的临时气泡，绝对定位到字段下方，
   sharp-edged 无圆角，金色背景醒目提示。 */
.char-warn{
  position:fixed;z-index:9999;
  background:var(--c-gold);color:var(--c-ink);
  padding:6px 12px;font-size:12px;font-weight:600;letter-spacing:.02em;
  opacity:0;transform:translateY(-4px);
  transition:opacity .25s ease,transform .25s ease;
  pointer-events:none;box-shadow:0 4px 12px rgba(15,26,40,.22);
  white-space:nowrap;
}
.char-warn.show{opacity:1;transform:translateY(0)}