/* ===== 方向研究院官网 · 设计系统 v1 ===== */
:root{
  --navy:#0f2b46;
  --navy-2:#163e63;
  --blue:#2b6cb0;
  --gold:#c9a24b;
  --gold-2:#e0bd6e;
  --tint:#eef4f9;
  --tint-gold:#faf3e2;
  --ink:#1f2a37;
  --muted:#6b7a8a;
  --line:#e3e8ee;
  --bg:#f7f9fb;
  --white:#fff;
  --green:#2f9e5e;
  --red:#d9534f;
  --orange:#e8923a;
  --shadow:0 6px 24px rgba(15,43,70,.08);
  --radius:12px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Segoe UI",sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.7;font-size:16px;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:var(--blue);text-decoration:none}
a:hover{color:var(--navy)}
.container{max-width:1200px;margin:0 auto;padding:0 24px}

/* ===== 顶部导航 ===== */
.topbar{
  position:sticky;top:0;z-index:100;background:rgba(255,255,255,.96);
  backdrop-filter:blur(8px);border-bottom:1px solid var(--line);
}
.topbar .inner{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:10px;color:var(--navy);font-weight:700;font-size:18px}
.brand .logo{width:38px;height:38px;border-radius:50%;background:var(--navy);color:var(--gold);
  display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:700;flex-shrink:0}
.nav{display:flex;align-items:center;gap:4px;list-style:none}
.nav a{display:block;padding:8px 14px;color:var(--ink);font-size:15px;border-radius:6px;white-space:nowrap}
.nav a:hover,.nav a.active{background:var(--tint);color:var(--navy)}
.nav .btn{margin-left:8px}
.menu-toggle{display:none;background:none;border:none;font-size:24px;cursor:pointer;color:var(--navy)}

/* ===== 按钮 ===== */
.btn{
  display:inline-block;padding:10px 22px;border-radius:8px;font-size:15px;font-weight:600;
  cursor:pointer;border:1px solid transparent;transition:all .2s;text-align:center;
}
.btn-primary{background:var(--gold);color:#fff}
.btn-primary:hover{background:#b8913f;color:#fff}
.btn-navy{background:var(--navy);color:#fff}
.btn-navy:hover{background:var(--navy-2);color:#fff}
.btn-outline{background:transparent;border-color:var(--navy);color:var(--navy)}
.btn-outline:hover{background:var(--navy);color:#fff}
.btn-lg{padding:14px 32px;font-size:16px}

/* ===== Hero ===== */
.hero{
  background:linear-gradient(135deg,var(--navy) 0%,var(--navy-2) 60%,#1d4d74 100%);
  color:#fff;padding:90px 0 100px;position:relative;overflow:hidden;
}
.hero::before{
  content:"";position:absolute;right:-100px;top:-100px;width:500px;height:500px;
  border-radius:50%;background:radial-gradient(circle,rgba(201,162,75,.18),transparent 70%);
}
.hero .container{position:relative;z-index:1}
.hero h1{font-size:44px;line-height:1.3;margin-bottom:18px;font-weight:700}
.hero .lead{font-size:19px;color:#d7e3ee;margin-bottom:30px;max-width:680px}
.hero .actions{display:flex;gap:14px;flex-wrap:wrap}
.hero .ghost{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.3);color:#fff}
.hero .ghost:hover{background:rgba(255,255,255,.2)}
.hero-badge{display:inline-block;background:rgba(201,162,75,.18);color:var(--gold-2);
  padding:6px 16px;border-radius:20px;font-size:13px;font-weight:600;margin-bottom:20px;
  border:1px solid rgba(201,162,75,.35)}

/* ===== 活动条幅 ===== */
.live-banner{background:linear-gradient(90deg,#fff8e6,#fffdf6);border-bottom:1px solid #ecd9a6}
.live-banner .container{display:flex;align-items:center;gap:18px;padding:14px 24px;flex-wrap:wrap}
.live-banner .tag{background:var(--gold);color:#fff;padding:4px 12px;border-radius:4px;
  font-size:12px;font-weight:700;letter-spacing:1px;flex-shrink:0}
.live-banner .info{flex:1;min-width:220px}
.live-banner .title{font-weight:700;color:var(--navy);font-size:15px}
.live-banner .meta{font-size:13px;color:var(--muted)}

/* ===== 通用区块 ===== */
.section{padding:72px 0}
.section.alt{background:#fff}
.section-head{text-align:center;max-width:720px;margin:0 auto 48px}
.section-head .kicker{color:var(--gold);font-weight:700;font-size:13px;letter-spacing:2px;text-transform:uppercase}
.section-head h2{font-size:32px;color:var(--navy);margin:8px 0 12px;font-weight:700}
.section-head p{color:var(--muted);font-size:16px}

/* ===== 数据条 ===== */
.stats{display:grid;grid-template-columns:repeat(5,1fr);gap:20px}
.stat{text-align:center;padding:28px 14px;background:#fff;border-radius:var(--radius);box-shadow:var(--shadow)}
.stat .num{font-size:34px;font-weight:700;color:var(--navy);line-height:1.1}
.stat .num em{color:var(--gold);font-style:normal}
.stat .lbl{font-size:13px;color:var(--muted);margin-top:6px}
.card .stat-num{font-size:34px;font-weight:700;color:var(--gold);line-height:1.1;margin-bottom:6px}

/* ===== 卡片网格 ===== */
.grid{display:grid;gap:24px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.card{
  background:#fff;border-radius:var(--radius);padding:28px;box-shadow:var(--shadow);
  border:1px solid var(--line);transition:transform .2s,box-shadow .2s;
}
.card:hover{transform:translateY(-3px);box-shadow:0 12px 32px rgba(15,43,70,.12)}
.card h3{font-size:19px;color:var(--navy);margin-bottom:10px}
.card p{color:var(--muted);font-size:14.5px}
.card .icon{width:48px;height:48px;border-radius:10px;background:var(--tint);
  display:flex;align-items:center;justify-content:center;font-size:22px;margin-bottom:14px}

/* ===== 页面内页头 ===== */
.page-hero{background:linear-gradient(135deg,var(--navy),var(--navy-2));color:#fff;padding:60px 0}
.page-hero h1{font-size:36px;margin-bottom:8px}
.page-hero p{color:#cdd9e5;font-size:17px}
.breadcrumb{font-size:13px;color:#9db2c6;margin-bottom:14px}
.breadcrumb a{color:#9db2c6}

/* ===== 表格 ===== */
.table-wrap{overflow-x:auto;border-radius:var(--radius);box-shadow:var(--shadow);background:#fff}
table.data{width:100%;border-collapse:collapse;font-size:14.5px;background:#fff;min-width:600px}
table.data th{background:var(--navy);color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px}
table.data td{padding:13px 16px;border-bottom:1px solid var(--line);vertical-align:top}
table.data tr:last-child td{border-bottom:none}
table.data tr:nth-child(even) td{background:#fafbfc}

/* ===== 页脚 ===== */
.footer{background:var(--navy);color:#b8c6d4;padding:60px 0 0;margin-top:0}
.footer .cols{display:grid;grid-template-columns:2fr 1fr 1fr 1.3fr;gap:36px;padding-bottom:40px}
.footer h4{color:#fff;font-size:15px;margin-bottom:16px}
.footer ul{list-style:none}
.footer li{margin-bottom:9px;font-size:14px}
.footer a{color:#b8c6d4}
.footer a:hover{color:var(--gold-2)}
.footer .desc{font-size:14px;line-height:1.8;margin-top:12px}
.footer .contact-line{font-size:14px;margin-bottom:8px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding:20px 0;text-align:center;font-size:13px;color:#8296a8}

/* ===== CTA区块 ===== */
.cta-band{background:linear-gradient(135deg,var(--navy),var(--navy-2));color:#fff;
  text-align:center;padding:60px 24px;border-radius:var(--radius)}
.cta-band h2{font-size:28px;margin-bottom:10px}
.cta-band p{color:#cdd9e5;margin-bottom:24px}

/* ===== 表单 ===== */
.form-card{background:#fff;border-radius:var(--radius);padding:36px;box-shadow:var(--shadow)}
.form-group{margin-bottom:18px}
.form-group label{display:block;font-size:14px;font-weight:600;color:var(--navy);margin-bottom:6px}
.form-group label .req{color:var(--red)}
.form-control{
  width:100%;padding:11px 14px;border:1px solid var(--line);border-radius:8px;font-size:15px;
  font-family:inherit;background:#fff;transition:border-color .2s;
}
.form-control:focus{outline:none;border-color:var(--gold)}
textarea.form-control{resize:vertical;min-height:100px}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.form-note{font-size:13px;color:var(--muted);margin-top:6px}
.form-success{display:none;background:#e8f6ee;border:1px solid #b7e0c8;color:#236b42;
  padding:16px;border-radius:8px;margin-bottom:20px;font-size:15px}

/* ===== 对比表 ===== */
.cmp-table th{text-align:center}
.cmp-table .old{background:#fdf6ee!important;color:#7a6442}
.cmp-table .new{background:#eef6f1!important;color:#1f5238}
.cmp-table .scene-name{font-weight:600;color:var(--navy)}
.cmp-table .agri{font-size:12.5px;color:var(--muted);display:block;margin-top:2px}

/* ===== 标签 ===== */
.pill{display:inline-block;padding:3px 11px;border-radius:12px;font-size:12px;font-weight:600}
.pill-gold{background:var(--tint-gold);color:#96731f}
.pill-blue{background:var(--tint);color:var(--blue)}
.pill-green{background:#e8f6ee;color:var(--green)}
.pill-red{background:#fdecec;color:var(--red)}
.pill-orange{background:#fdf2e3;color:var(--orange)}

/* ===== 理论页 ===== */
.theory-block{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center;margin-bottom:70px}
.theory-block.reverse .theory-media{order:2}
.theory-text .idx-tag{color:var(--gold);font-weight:700;font-size:14px;letter-spacing:1px}
.theory-text h3{font-size:26px;color:var(--navy);margin:6px 0 14px}
.theory-text p{color:#46556a;margin-bottom:12px;font-size:15.5px}
.theory-media{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);border:1px solid var(--line);background:#fff;padding:10px}
.theory-media img{border-radius:6px;width:100%}
.theory-media .cap{font-size:12.5px;color:var(--muted);text-align:center;padding:8px 4px 2px}

/* ===== 文章卡 ===== */
.article-card{display:flex;flex-direction:column;background:#fff;border-radius:var(--radius);
  overflow:hidden;box-shadow:var(--shadow);border:1px solid var(--line)}
.article-card .body{padding:22px}
.article-card h3{font-size:17px;color:var(--navy);margin:8px 0 8px;line-height:1.5}
.article-card p{font-size:14px;color:var(--muted)}
.article-card .meta{font-size:12.5px;color:#9aa7b4}
.article-tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:30px;justify-content:center}
.article-tabs button{padding:8px 20px;border:1px solid var(--line);background:#fff;border-radius:20px;
  cursor:pointer;font-size:14px;color:var(--muted)}
.article-tabs button.active{background:var(--navy);color:#fff;border-color:var(--navy)}

/* ===== 时间轴/流程 ===== */
.flow-steps{display:grid;grid-template-columns:repeat(5,1fr);gap:0;counter-reset:step}
.flow-step{position:relative;padding:24px 18px;text-align:center}
.flow-step .n{width:44px;height:44px;border-radius:50%;background:var(--navy);color:var(--gold);
  display:inline-flex;align-items:center;justify-content:center;font-size:18px;font-weight:700;margin-bottom:12px}
.flow-step h4{font-size:15px;color:var(--navy);margin-bottom:6px}
.flow-step p{font-size:13px;color:var(--muted)}
.flow-step:not(:last-child)::after{content:"→";position:absolute;right:-8px;top:34px;
  color:var(--gold);font-size:22px;font-weight:700;z-index:1}

/* ===== FAQ ===== */
.faq-item{border:1px solid var(--line);border-radius:10px;margin-bottom:12px;background:#fff;overflow:hidden}
.faq-q{padding:18px 22px;font-weight:600;color:var(--navy);cursor:pointer;display:flex;
  justify-content:space-between;align-items:center;list-style:none}
.faq-q::-webkit-details-marker{display:none}
.faq-q .arrow{transition:transform .2s;color:var(--gold)}
.faq-item[open] .arrow{transform:rotate(180deg)}
.faq-a{padding:0 22px 18px;color:#46556a;font-size:14.5px}

/* ===== Logo墙 ===== */
.logo-wall{display:grid;grid-template-columns:repeat(5,1fr);gap:16px;align-items:center}
.logo-wall .item{background:#fff;border:1px solid var(--line);border-radius:8px;padding:22px 10px;
  text-align:center;font-size:14px;color:var(--muted);font-weight:600}

/* ===== 产品阶梯 ===== */
.tier{display:grid;grid-template-columns:90px 1fr auto;gap:18px;align-items:center;
  background:#fff;border:1px solid var(--line);border-radius:10px;padding:18px 24px;margin-bottom:12px}
.tier .level{width:54px;height:54px;border-radius:50%;background:var(--tint);color:var(--navy);
  display:flex;align-items:center;justify-content:center;font-weight:700;font-size:13px;text-align:center}
.tier h4{font-size:16px;color:var(--navy)}
.tier .desc{font-size:13.5px;color:var(--muted)}
.tier .price{font-size:20px;font-weight:700;color:var(--gold);white-space:nowrap}
.tier.highlight{border-color:var(--gold);background:#fffdf6}

/* ===== 响应式 ===== */
@media(max-width:980px){
  .nav{position:fixed;top:68px;left:0;right:0;background:#fff;flex-direction:column;
    align-items:stretch;padding:16px;border-bottom:1px solid var(--line);gap:2px;
    display:none;box-shadow:var(--shadow)}
  .nav.open{display:flex}
  .nav a{padding:12px 16px}
  .nav .btn{margin:8px 0 0}
  .menu-toggle{display:block}
  .hero h1{font-size:32px}
  .hero .lead{font-size:16px}
  .stats{grid-template-columns:repeat(2,1fr)}
  .grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}
  .footer .cols{grid-template-columns:1fr 1fr}
  .theory-block{grid-template-columns:1fr}
  .theory-block.reverse .theory-media{order:0}
  .flow-steps{grid-template-columns:repeat(2,1fr)}
  .flow-step:not(:last-child)::after{display:none}
  .logo-wall{grid-template-columns:repeat(3,1fr)}
  .section{padding:50px 0}
  .section-head h2{font-size:26px}
}
@media(max-width:600px){
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
  .form-row{grid-template-columns:1fr}
  .stats{grid-template-columns:1fr 1fr}
  .footer .cols{grid-template-columns:1fr}
  .tier{grid-template-columns:60px 1fr;gap:12px}
  .tier .price{grid-column:1/-1;padding-left:0}
  .hero{padding:60px 0 70px}
  .hero h1{font-size:27px}
}