/* ============================================================
   GS MODULAR CONSTRUCTION — 正式版 v1.0 (R2) 样式
   设计语言：浅色科技风（工程蓝 + 蓝图纹理）| 中英双语 | 响应式
   说明：本版为"逐步完善"第一版，图片/视频/联系方式均为占位，
        资料到位后逐项替换（搜索 TODO 定位）。
   ============================================================ */

/* ---------- Design Tokens ---------- */
:root{
  --bg:          #f3f7fc;
  --surface:     #ffffff;
  --surface-2:   #eaf1f9;
  --ink:         #0c1a2e;
  --muted:       #54657d;
  --line:        #dde7f2;
  --line-strong: #c6d6e8;
  --primary:     #1466e0;
  --primary-dark:#0c4fb8;
  --primary-soft:rgba(20,102,224,.09);
  --navy:        #0c1a2e;
  --ok:          #0d9f6e;
  --radius:      14px;
  --shadow-sm:   0 2px 10px rgba(12,26,46,.06);
  --shadow:      0 12px 34px rgba(12,26,46,.10);
  --shadow-lg:   0 24px 60px rgba(12,26,46,.14);
  --maxw:        1160px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --mono: ui-monospace, "Cascadia Mono", "SF Mono", Consolas, monospace;
}
*{ margin:0; padding:0; box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  background:var(--bg);
  color:var(--ink);
  font-family:var(--font);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
ul{ list-style:none; }
.wrap{ max-width:var(--maxw); margin:0 auto; padding:0 24px; }
section{ padding:96px 0; }

/* 通用组件 */
.kicker{
  font-family:var(--mono); font-size:12px; letter-spacing:.2em; text-transform:uppercase;
  color:var(--primary); font-weight:600; margin-bottom:14px;
}
.h2{ font-size:clamp(26px,4vw,38px); line-height:1.25; font-weight:800; letter-spacing:.01em; color:var(--ink); }
.sub{ color:var(--muted); margin-top:14px; max-width:640px; }
.section-head{ margin-bottom:52px; }
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  padding:13px 26px; border-radius:10px; font-weight:700; font-size:15px;
  border:1px solid transparent; cursor:pointer; transition:transform .15s, box-shadow .15s, background .15s, border-color .15s;
  font-family:var(--font); white-space:nowrap;
}
.btn-primary{ background:var(--primary); color:#fff; }
.btn-primary:hover{ background:var(--primary-dark); transform:translateY(-1px); box-shadow:0 8px 24px rgba(20,102,224,.32); }
.btn-ghost{ border-color:var(--line-strong); color:var(--ink); background:var(--surface); }
.btn-ghost:hover{ border-color:var(--primary); color:var(--primary); }
.btn-sm{ padding:9px 18px; font-size:13.5px; border-radius:8px; }
/* 待填写占位样式 */
.tbd{
  display:inline-block; border-bottom:2px dashed var(--line-strong);
  color:var(--muted); font-weight:600;
}

/* ============ 顶部条 ============ */
.topbar{ background:var(--navy); color:#c7d4e6; font-size:13px; }
.topbar-inner{ display:flex; align-items:center; justify-content:space-between; gap:16px; height:40px; flex-wrap:wrap; }
.topbar-left{ display:flex; gap:22px; align-items:center; }
.topbar-left span{ display:inline-flex; align-items:center; gap:6px; }
.topbar-left .tbd{ color:#9db3cc; border-bottom-color:rgba(255,255,255,.35); }
.topbar-right{ font-family:var(--mono); font-size:12px; letter-spacing:.1em; color:#8fa5c0; }
@media (max-width:720px){ .topbar-right{ display:none; } }

/* ============ 导航 ============ */
nav{
  position:sticky; top:0; z-index:50;
  background:rgba(255,255,255,.88);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
}
.nav-inner{ display:flex; align-items:center; gap:28px; height:70px; }
.brand{ display:flex; align-items:center; gap:12px; font-weight:800; letter-spacing:.02em; color:var(--ink); }
.brand-mark{
  width:38px; height:38px; border-radius:10px;
  background:linear-gradient(135deg, var(--primary), #2f86ff);
  display:grid; place-items:center; font-weight:900; font-size:15px; color:#fff;
  box-shadow:0 4px 14px rgba(20,102,224,.35);
  letter-spacing:.02em;
}
.brand-sub{ display:block; font-size:10px; font-weight:500; letter-spacing:.28em; color:var(--muted); }
.nav-links{ display:flex; gap:26px; margin-left:auto; font-size:14.5px; color:var(--muted); align-items:center; }
.nav-links a{ transition:color .18s; font-weight:500; }
.nav-links a:hover{ color:var(--primary); }
.nav-cta{ margin-left:6px; }
.lang-toggle{
  border:1px solid var(--line-strong); background:var(--surface); color:var(--ink);
  border-radius:999px; padding:6px 14px; font-size:13px; cursor:pointer;
  font-family:var(--font); transition:border-color .18s, color .18s;
}
.lang-toggle:hover{ border-color:var(--primary); color:var(--primary); }
.burger{ display:none; background:none; border:1px solid var(--line-strong); border-radius:8px;
  width:40px; height:40px; cursor:pointer; color:var(--ink); font-size:18px; }
@media (max-width:900px){
  .nav-links{
    display:none; position:absolute; top:70px; left:0; right:0;
    flex-direction:column; gap:0; background:var(--surface);
    border-bottom:1px solid var(--line); padding:10px 0; box-shadow:var(--shadow);
  }
  .nav-links.open{ display:flex; }
  .nav-links a{ padding:14px 24px; }
  .nav-cta{ margin:10px 24px; }
  .burger{ display:block; margin-left:auto; }
}

/* ============ Hero（浅色 + 蓝图网格） ============ */
.hero{
  position:relative; overflow:hidden;
  padding:104px 0 116px;
  background:
    linear-gradient(180deg, #e4eefb 0%, var(--bg) 88%);
}
.hero::before{ /* 蓝图网格纹理 */
  content:""; position:absolute; inset:0;
  background-image:
    linear-gradient(rgba(20,102,224,.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(20,102,224,.055) 1px, transparent 1px);
  background-size:44px 44px;
  mask-image:radial-gradient(ellipse 85% 80% at 72% 30%, #000 25%, transparent 78%);
  -webkit-mask-image:radial-gradient(ellipse 85% 80% at 72% 30%, #000 25%, transparent 78%);
  pointer-events:none;
}
.hero::after{ /* 右上角装饰圆 */
  content:""; position:absolute; right:-160px; top:-160px; width:420px; height:420px;
  border-radius:50%;
  background:radial-gradient(circle, rgba(20,102,224,.10), transparent 62%);
  pointer-events:none;
}
.hero-inner{ position:relative; display:grid; grid-template-columns:1.05fr .95fr; gap:56px; align-items:center; }
.hero h1{
  font-size:clamp(34px,5.2vw,56px); line-height:1.12; font-weight:900; letter-spacing:.01em; color:var(--ink);
}
.hero h1 .accent{ color:var(--primary); }
.hero-lead{ color:var(--muted); font-size:17px; margin-top:22px; max-width:520px; }
.hero-cta{ display:flex; gap:14px; margin-top:36px; flex-wrap:wrap; }
.hero-facts{ display:flex; gap:26px; margin-top:40px; flex-wrap:wrap; }
.hero-fact{ display:flex; align-items:center; gap:9px; font-size:13.5px; color:var(--muted); font-weight:600; }
.hero-fact::before{
  content:"✓"; width:20px; height:20px; border-radius:50%;
  background:var(--primary-soft); color:var(--primary);
  display:grid; place-items:center; font-size:11px; font-weight:900;
}

/* Hero 右侧蓝图式模块堆叠示意图 */
.hero-art{ position:relative; }
.stack-art{
  background:var(--surface); border:1px solid var(--line-strong); border-radius:var(--radius);
  padding:30px; box-shadow:var(--shadow-lg); position:relative;
}
.stack-art::before, .stack-art::after{ /* 工程角标 */
  content:""; position:absolute; width:22px; height:22px; border:2px solid var(--primary); opacity:.55;
}
.stack-art::before{ top:12px; left:12px; border-right:0; border-bottom:0; }
.stack-art::after{ bottom:12px; right:12px; border-left:0; border-top:0; }
.stack-art svg{ width:100%; height:auto; }
.art-caption{ text-align:center; margin-top:16px; font-size:12px; color:var(--muted); font-family:var(--mono); letter-spacing:.12em; }
@media (max-width:900px){
  .hero-inner{ grid-template-columns:1fr; gap:44px; }
  .hero{ padding:72px 0 84px; }
}

/* ============ 产品 ============ */
.prod-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:22px; }
.prod-card{
  background:var(--surface); border:1px solid var(--line); border-radius:var(--radius);
  padding:30px; display:flex; flex-direction:column; gap:15px; position:relative;
  transition:border-color .2s, transform .2s, box-shadow .2s;
}
.prod-card:hover{ border-color:var(--primary); transform:translateY(-4px); box-shadow:var(--shadow); }
.prod-icon{
  width:54px; height:54px; border-radius:12px; background:var(--primary-soft);
  display:grid; place-items:center; color:var(--primary);
}
.prod-card h3{ font-size:19px; font-weight:800; }
.prod-card p{ color:var(--muted); font-size:14.5px; flex:1; }
.prod-tag{ font-family:var(--mono); font-size:11.5px; color:var(--primary); letter-spacing:.1em; font-weight:600; }
@media (max-width:900px){ .prod-grid{ grid-template-columns:1fr; } }

/* ============ 优势 ============ */
#advantages{ background:var(--surface); border-top:1px solid var(--line); border-bottom:1px solid var(--line); }
.adv-grid{ display:grid; grid-template-columns:repeat(2,1fr); gap:20px; }
.adv-item{
  display:flex; gap:18px; padding:26px; background:var(--bg);
  border:1px solid var(--line); border-radius:var(--radius);
  transition:border-color .2s, box-shadow .2s;
}
.adv-item:hover{ border-color:var(--line-strong); box-shadow:var(--shadow-sm); }
.adv-num{
  font-family:var(--mono); font-size:13px; color:var(--primary); font-weight:700;
  padding-top:4px; letter-spacing:.05em;
}
.adv-item h3{ font-size:17px; font-weight:800; margin-bottom:8px; }
.adv-item p{ color:var(--muted); font-size:14.5px; }
@media (max-width:900px){ .adv-grid{ grid-template-columns:1fr; } }

/* ============ 场景 ============ */
.scene-grid{ display:grid; grid-template-columns:repeat(4,1fr); gap:18px; }
.scene-tile{
  border:1px solid var(--line); border-radius:var(--radius); padding:26px 22px;
  background:var(--surface); transition:border-color .2s, transform .2s, box-shadow .2s;
}
.scene-tile:hover{ border-color:var(--primary); transform:translateY(-3px); box-shadow:var(--shadow); }
.scene-tile .ic{ color:var(--primary); margin-bottom:14px; display:block; }
.scene-tile h3{ font-size:15.5px; font-weight:800; margin-bottom:6px; }
.scene-tile p{ font-size:13px; color:var(--muted); }
@media (max-width:900px){ .scene-grid{ grid-template-columns:repeat(2,1fr); } }
@media (max-width:540px){ .scene-grid{ grid-template-columns:1fr; } }

/* ============ 案例 ============ */
#cases{ background:var(--surface); border-top:1px solid var(--line); border-bottom:1px solid var(--line); }
.case-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:22px; }
.case-card{
  border:1px solid var(--line); border-radius:var(--radius); overflow:hidden;
  background:var(--surface); transition:border-color .2s, transform .2s, box-shadow .2s;
}
.case-card:hover{ border-color:var(--primary); transform:translateY(-4px); box-shadow:var(--shadow); }
.case-photo{
  aspect-ratio:16/10; display:grid; place-items:center;
  background:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px),
    var(--bg);
  background-size:26px 26px;
  color:var(--muted); font-size:13px; letter-spacing:.12em; text-align:center; padding:20px;
}
.case-photo .ph-icon{ display:block; margin:0 auto 10px; color:var(--line-strong); }
.case-body{ padding:22px; }
.case-body h3{ font-size:16px; font-weight:800; margin-bottom:6px; }
.case-body p{ font-size:13.5px; color:var(--muted); }
@media (max-width:900px){ .case-grid{ grid-template-columns:1fr; } }

/* ============ 视频区 ============ */
.video-box{
  aspect-ratio:16/9; border-radius:var(--radius); position:relative; overflow:hidden;
  border:1px solid var(--line-strong);
  background:
    linear-gradient(rgba(20,102,224,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(20,102,224,.05) 1px, transparent 1px),
    linear-gradient(180deg, #e6effb, var(--bg));
  background-size:40px 40px, 40px 40px, 100% 100%;
  display:grid; place-items:center;
}
.play-btn{
  width:76px; height:76px; border-radius:50%;
  background:linear-gradient(135deg, var(--primary), #2f86ff);
  display:grid; place-items:center; cursor:pointer;
  box-shadow:0 10px 30px rgba(20,102,224,.4);
  transition:transform .15s, box-shadow .15s;
}
.play-btn:hover{ transform:scale(1.06); box-shadow:0 14px 40px rgba(20,102,224,.5); }
.play-btn svg{ margin-left:4px; }
.video-caption{ text-align:center; margin-top:16px; color:var(--muted); font-size:13.5px; }
.video-caption .tbd{ font-family:var(--mono); }

/* ============ 工厂 ============ */
.factory-inner{ display:grid; grid-template-columns:.9fr 1.1fr; gap:56px; align-items:center; }
.factory-visual{
  aspect-ratio:4/3; border-radius:var(--radius); border:1px solid var(--line-strong);
  display:grid; place-items:center; position:relative; overflow:hidden;
  background:
    radial-gradient(circle at 30% 20%, rgba(20,102,224,.08), transparent 45%),
    var(--surface);
}
.factory-visual .placeholder{
  text-align:center; color:var(--muted); font-size:13px; letter-spacing:.12em; padding:24px;
}
.factory-visual .corner{ position:absolute; width:26px; height:26px; border:2px solid var(--primary); opacity:.5; }
.factory-visual .corner.tl{ top:14px; left:14px; border-right:0; border-bottom:0; }
.factory-visual .corner.br{ bottom:14px; right:14px; border-left:0; border-top:0; }
.factory-list{ margin-top:24px; display:flex; flex-direction:column; gap:13px; }
.factory-list li{ display:flex; gap:12px; color:var(--muted); font-size:15px; }
.factory-list li::before{ content:"▸"; color:var(--primary); font-weight:700; }
@media (max-width:900px){ .factory-inner{ grid-template-columns:1fr; gap:36px; } }

/* ============ 联系 ============ */
#contact{ background:var(--surface); border-top:1px solid var(--line); }
.contact-grid{ display:grid; grid-template-columns:repeat(4,1fr); gap:18px; margin-bottom:44px; }
.contact-card{
  border:1px solid var(--line); border-radius:var(--radius); padding:24px; background:var(--surface);
  transition:border-color .2s, box-shadow .2s;
}
.contact-card:hover{ border-color:var(--line-strong); box-shadow:var(--shadow-sm); }
.contact-card .label{ font-size:12px; letter-spacing:.14em; color:var(--muted); margin-bottom:10px; font-family:var(--mono); }
.contact-card .value{ font-size:15px; font-weight:700; word-break:break-all; }
.contact-card .value .tbd{ font-size:14px; }
.form-card{
  border:1px solid var(--line); border-radius:var(--radius); padding:34px;
  background:var(--bg);
}
.form-card h3{ font-size:20px; font-weight:800; margin-bottom:6px; }
.form-card .form-sub{ color:var(--muted); font-size:14px; margin-bottom:26px; }
.form-grid{ display:grid; grid-template-columns:1fr 1fr; gap:18px; }
.form-field{ display:flex; flex-direction:column; gap:7px; }
.form-field.full{ grid-column:1 / -1; }
.form-field label{ font-size:13.5px; font-weight:700; color:var(--ink); }
.form-field input, .form-field textarea{
  border:1px solid var(--line-strong); border-radius:9px; padding:12px 14px;
  font-size:14.5px; font-family:var(--font); background:var(--surface); color:var(--ink);
  transition:border-color .18s, box-shadow .18s;
}
.form-field input:focus, .form-field textarea:focus{
  outline:none; border-color:var(--primary); box-shadow:0 0 0 3px rgba(20,102,224,.12);
}
.form-field textarea{ min-height:110px; resize:vertical; }
.form-submit-row{ display:flex; align-items:center; gap:16px; margin-top:22px; flex-wrap:wrap; }
.form-alt{ color:var(--muted); font-size:13.5px; }
.form-alt a{ color:var(--primary); font-weight:600; }
.form-note{ margin-top:14px; font-size:12.5px; color:var(--muted); }
@media (max-width:900px){
  .contact-grid{ grid-template-columns:repeat(2,1fr); }
  .form-grid{ grid-template-columns:1fr; }
}
@media (max-width:540px){ .contact-grid{ grid-template-columns:1fr; } }

/* ============ Footer ============ */
footer{ border-top:1px solid var(--line); padding:44px 0 40px; background:var(--bg); }
.foot-inner{ display:flex; justify-content:space-between; gap:20px; flex-wrap:wrap; align-items:center; }
.foot-copy{ font-size:13px; color:var(--muted); }
.foot-icp{ font-size:12px; color:var(--muted); font-family:var(--mono); }

/* ============ 滚动显现 ============ */
.reveal{ opacity:0; transform:translateY(18px); transition:opacity .6s ease, transform .6s ease; }
.reveal.in{ opacity:1; transform:none; }
@media (prefers-reduced-motion:reduce){
  html{ scroll-behavior:auto; }
  .reveal{ opacity:1; transform:none; transition:none; }
  .btn, .prod-card, .case-card, .scene-tile{ transition:none; }
}