/* ================== 变量 & Reset ================== */
:root{
  --primary:#2563eb;
  --primary-dark:#1d4ed8;
  --text-main:#111827;
  --text-sub:#6b7280;
  --bg:#f8fafc;
  --border:rgba(229,231,235,.65);
  --glass:rgba(255,255,255,.6);
  --shadow:0 20px 50px rgba(15,23,42,.12);
  --radius:18px;
  --max-width:1120px;
}

*{box-sizing:border-box;margin:0;padding:0}
body{
  font-family:system-ui,-apple-system,"Segoe UI",sans-serif;
  background:var(--bg);
  color:var(--text-main);
  line-height:1.65;
}
a{text-decoration:none;color:inherit}
ul{list-style:none}

/* ================== 通用容器 ================== */
.container{
  max-width:var(--max-width);
  margin:0 auto;
  padding:0 16px;
}

/* ================== Header ================== */
.site-header{
  position:sticky;
  top:0;
  z-index:50;
  background:rgba(248,250,252,.82);
  backdrop-filter:blur(14px);
  border-bottom:1px solid var(--border);
}
.nav{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:12px 0;
}
.nav-left{display:flex;align-items:center;gap:10px}
.nav-logo{
  width:34px;height:34px;border-radius:50%;
  background:radial-gradient(circle at 30% 20%,#bfdbfe,#2563eb,#1d4ed8);
}
.nav-title{font-weight:800;font-size:15px}
.nav-subtitle{font-size:11px;color:var(--text-sub)}
.nav-menu{display:flex;gap:16px;font-size:14px}
.nav-link a{
  padding:6px 10px;border-radius:999px;
  color:#4b5563;
}
.nav-link a:hover{
  background:rgba(37,99,235,.12);
  color:var(--primary-dark);
}

/* ================== Hero ================== */
.section-hero{
  padding:56px 0 36px;
}
.hero-inner{
  display:grid;
  grid-template-columns:1.2fr .8fr;
  gap:24px;
  align-items:center;
}
.hero-pill{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:6px 12px;
  font-size:12px;
  border-radius:999px;
  background:rgba(37,99,235,.1);
  color:var(--primary-dark);
  margin-bottom:12px;
}
.hero-pill .dot{
  width:6px;height:6px;border-radius:50%;
  background:#22c55e;
}
.title{
  font-size:36px;
  font-weight:900;
  margin-bottom:12px;
}
.subtitle{
  font-size:15px;
  color:var(--text-sub);
}
.hero-hints{
  margin-top:12px;
  display:flex;
  gap:10px;
  font-size:12px;
  color:#6b7280;
}

/* ===== 判断引擎卡片 ===== */
.hero-card{
  padding:18px;
  border-radius:22px;
  background:var(--glass);
  backdrop-filter:blur(18px);
  border:1px solid var(--border);
  box-shadow:var(--shadow);
}
.hero-card-top{
  display:flex;
  justify-content:space-between;
  margin-bottom:12px;
}
.hero-card-title{font-weight:900}
.hero-card-tag{font-size:12px;color:#6b7280}
.hero-card-main{
  margin-bottom:14px;
}
.hero-card-k{font-weight:800}
.hero-card-v{font-size:13px;color:#4b5563}
.hero-card-foot{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:10px;
}
.mini-kpi{
  background:rgba(255,255,255,.7);
  border-radius:14px;
  padding:8px;
  border:1px solid var(--border);
}
.mini-kpi .k{font-size:11px;color:#6b7280}
.mini-kpi .v{font-size:12px;font-weight:800}

/* ================== Cards ================== */
.section-cards{padding:32px 0 72px}
.cards-head{text-align:center;margin-bottom:24px}
.cards-title{font-size:22px;font-weight:900}
.cards-desc{font-size:13px;color:var(--text-sub)}

.cards-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:18px;
}

/* ===== 方案卡片 ===== */
.solution-card{
  position:relative;
  padding:18px;
  border-radius:20px;
  background:var(--glass);
  backdrop-filter:blur(16px);
  border:1px solid var(--border);
  box-shadow:var(--shadow);
  transition:transform .25s ease,box-shadow .25s ease;
}
.solution-card:hover{
  transform:translateY(-6px) scale(1.01);
  box-shadow:0 30px 70px rgba(15,23,42,.18);
}

.card-top{
  display:flex;
  justify-content:space-between;
  margin-bottom:8px;
}
.card-badge{
  font-size:11px;
  padding:4px 8px;
  border-radius:999px;
  background:rgba(37,99,235,.12);
  color:var(--primary-dark);
}
.card-icon{font-size:20px}
.card-title{font-weight:900;margin-bottom:6px}
.card-text{font-size:13px;color:#4b5563}
.card-foot{margin-top:12px}
.card-cta{
  font-size:13px;
  color:var(--primary);
  font-weight:700;
}

/* ================== Hover Modal ================== */
.sol-modal{
  position:fixed;
  inset:0;
  display:none;
  z-index:100;
}
.sol-modal.show{display:block}
.sol-modal-backdrop{
  position:absolute;
  inset:0;
  background:rgba(15,23,42,.45);
  backdrop-filter:blur(6px);
}
.sol-modal-panel{
  position:absolute;
  left:50%;top:50%;
  transform:translate(-50%,-50%) scale(.96);
  width:min(520px,92%);
  padding:20px;
  border-radius:22px;
  background:rgba(255,255,255,.85);
  backdrop-filter:blur(20px);
  border:1px solid var(--border);
  box-shadow:0 40px 80px rgba(0,0,0,.25);
  animation:modalIn .25s ease forwards;
}
@keyframes modalIn{
  to{transform:translate(-50%,-50%) scale(1)}
}
.sol-modal-close{
  position:absolute;
  right:12px;top:12px;
  border:none;
  background:none;
  font-size:20px;
  cursor:pointer;
}
.sol-modal-head{
  display:flex;
  gap:12px;
  align-items:center;
  margin-bottom:12px;
}
.sol-modal-icon{font-size:28px}
.sol-modal-title{font-size:18px;font-weight:900}
.sol-modal-sub{font-size:12px;color:#6b7280}
.sol-modal-body{font-size:13px;color:#374151}
.sol-modal-foot{
  margin-top:16px;
  text-align:right;
}
.sol-modal-btn{
  font-size:13px;
  color:var(--primary);
  font-weight:800;
}

/* ================== Footer ================== */
.site-footer{
  border-top:1px solid var(--border);
  padding:20px 0;
  font-size:12px;
  color:#6b7280;
}
.footer-inner{
  display:flex;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:10px;
}
.footer-links{display:flex;gap:14px}

/* ================== Responsive ================== */
@media(max-width:1000px){
  .hero-inner{grid-template-columns:1fr}
  .cards-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:640px){
  .cards-grid{grid-template-columns:1fr}
  .nav-menu{display:none}
}
/* ===== Mobile Nav (Solutions) ===== */
.nav-toggle{
  display: none;
  width: 34px;
  height: 34px;
  border-radius: 999px;
  border: 1px solid rgba(229,231,235,0.75);
  background: rgba(255,255,255,0.6);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 10px 26px rgba(15,23,42,0.10);
  font-size: 18px;
  cursor: pointer;
  flex: 0 0 auto;
}

/* 你之前在 900px 时隐藏 nav-menu，这里保留隐藏，但换成 toggle */
@media (max-width: 900px){
  .nav-menu{ display: none; }
  .nav-toggle{ display: inline-flex; align-items:center; justify-content:center; }
}

/* ===== Mobile Menu Drawer ===== */
.mobile-menu{
  position: fixed;
  inset: 0;
  z-index: 999;
  display: none;
}

.mobile-menu.is-open{ display: block; }

.mobile-menu-backdrop{
  position: absolute;
  inset: 0;
  background: rgba(15,23,42,0.38);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.mobile-menu-panel{
  position: absolute;
  top: 12px;
  right: 12px;
  width: min(320px, calc(100% - 24px));
  padding: 12px;
  border-radius: 18px;
  border: 1px solid rgba(229,231,235,0.65);
  background: rgba(255,255,255,0.66);
  box-shadow: 0 24px 60px rgba(15,23,42,0.20);
  transform: translateY(-6px);
  opacity: 0;
  transition: transform .18s ease, opacity .18s ease;
}

.mobile-menu.is-open .mobile-menu-panel{
  transform: translateY(0);
  opacity: 1;
}

.mobile-menu-head{
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 4px 10px;
  border-bottom: 1px solid rgba(229,231,235,0.7);
  margin-bottom: 10px;
}

.mobile-menu-title{
  font-size: 13px;
  font-weight: 900;
  color: #111827;
}

.mobile-menu-close{
  width: 32px;
  height: 32px;
  border-radius: 999px;
  border: 1px solid rgba(229,231,235,0.75);
  background: rgba(255,255,255,0.55);
  cursor: pointer;
  font-size: 18px;
  line-height: 1;
}

.mobile-menu-link{
  display: block;
  padding: 10px 10px;
  border-radius: 14px;
  font-size: 14px;
  color: #111827;
  border: 1px solid transparent;
  transition: background .16s ease, border-color .16s ease, transform .12s ease;
}

.mobile-menu-link:hover{
  background: rgba(37,99,235,0.10);
  border-color: rgba(37,99,235,0.18);
  transform: translateY(-1px);
}

.mobile-menu-link.active{
  background: rgba(37,99,235,0.14);
  border-color: rgba(37,99,235,0.24);
  color: #1d4ed8;
  font-weight: 800;
}