/* ============ 设计系统 v2 · 鸿桐教育 ============
   配色：教育深蓝（品牌） + 书页白 + 金色点缀（权威 + 温度）
   原则：克制、专业、留白充足、移动优先
*/

:root{
  --brand:#1F4E79;
  --brand-2:#2C5E8F;
  --brand-dark:#163a59;
  --accent:#C8922E;        /* 金色点缀 */
  --accent-2:#E0A93F;
  --ink:#1b1f24;
  --ink-2:#46505a;
  --ink-3:#7a8693;
  --line:#e6ebf1;
  --bg:#ffffff;
  --bg-soft:#f4f7fb;
  --bg-tint:#eef3f9;
  --radius:16px;
  --radius-sm:10px;
  --shadow-sm:0 1px 3px rgba(22,58,89,.06),0 1px 2px rgba(22,58,89,.04);
  --shadow:0 10px 28px rgba(22,58,89,.10);
  --shadow-lg:0 20px 46px rgba(22,58,89,.16);
  --maxw:1120px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,-apple-system,sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.75;font-size:16px;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;display:block}
ul{list-style:none}
h1,h2,h3,h4{line-height:1.3;color:var(--ink)}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{
  outline:2px solid var(--accent);outline-offset:2px;
}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 22px}

/* ---------- 顶部导航（sticky） ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.86);
  backdrop-filter:saturate(160%) blur(10px);
  border-bottom:1px solid transparent;
  transition:box-shadow .25s var(--ease),border-color .25s var(--ease),background .25s var(--ease);
}
.site-header.scrolled{box-shadow:var(--shadow-sm);border-color:var(--line);background:rgba(255,255,255,.95)}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 0}
.brand{display:flex;flex-direction:column;line-height:1.15}
.brand-name{font-size:20px;font-weight:700;color:var(--brand);letter-spacing:.5px}
.brand-sub{font-size:12px;color:var(--ink-3);margin-top:2px}

.site-nav{display:flex;align-items:center;gap:26px}
.site-nav a{font-size:15px;color:var(--ink-2);position:relative;padding:4px 0}
.site-nav a::after{content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;background:var(--accent);transform:scaleX(0);transform-origin:left;transition:transform .22s var(--ease)}
.site-nav a:hover{color:var(--brand);text-decoration:none}
.site-nav a:hover::after,.site-nav a.is-active::after{transform:scaleX(1)}
.site-nav a.is-active{color:var(--brand);font-weight:600}
.nav-tel{font-size:15px;font-weight:700;color:var(--brand);white-space:nowrap}
.nav-tel::after{display:none}
.nav-toggle{display:none;background:none;border:1px solid var(--line);border-radius:8px;width:42px;height:38px;cursor:pointer;align-items:center;justify-content:center}
.nav-toggle span,.nav-toggle span::before,.nav-toggle span::after{display:block;width:18px;height:2px;background:var(--brand);position:relative;transition:.2s}
.nav-toggle span::before,.nav-toggle span::after{content:"";position:absolute;left:0}
.nav-toggle span::before{top:-6px}
.nav-toggle span::after{top:6px}

/* ---------- 按钮 ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 26px;border-radius:10px;font-size:15px;font-weight:600;border:1.5px solid transparent;cursor:pointer;transition:transform .15s var(--ease),box-shadow .2s var(--ease),background .2s var(--ease)}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn-gold{background:var(--accent);color:#1c1405;box-shadow:0 6px 18px rgba(200,146,46,.30)}
.btn-gold:hover{background:var(--accent-2)}
.btn-brand{background:var(--brand);color:#fff}
.btn-brand:hover{background:var(--brand-2);box-shadow:var(--shadow)}
.btn-ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.55)}
.btn-ghost:hover{background:rgba(255,255,255,.14);border-color:#fff}
.btn-ghost-dark{background:transparent;color:var(--brand);border-color:var(--brand)}
.btn-ghost-dark:hover{background:var(--bg-tint)}
.btn-sm{padding:9px 18px;font-size:14px}

/* ---------- Hero ---------- */
.hero{position:relative;overflow:hidden;color:#fff;
  background:
    radial-gradient(1100px 520px at 78% -10%,rgba(44,94,143,.55),transparent 60%),
    radial-gradient(700px 420px at 10% 120%,rgba(200,146,46,.18),transparent 55%),
    linear-gradient(135deg,var(--brand-dark),var(--brand) 60%,var(--brand-2));
}
.hero::after{content:"";position:absolute;inset:0;background-image:
  linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),
  linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
  background-size:46px 46px;mask-image:radial-gradient(900px 500px at 70% 0%,#000,transparent 75%);pointer-events:none}
.hero .wrap{position:relative;z-index:1;display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:center;padding:78px 22px 84px}
.hero h1{font-size:38px;font-weight:700;letter-spacing:.5px;line-height:1.32}
.hero p{margin-top:18px;font-size:17px;color:#d8e5ef;max-width:560px}
.hero-actions{margin-top:30px;display:flex;gap:14px;flex-wrap:wrap}
.hero-card{background:rgba(255,255,255,.10);border:1px solid rgba(255,255,255,.18);border-radius:var(--radius);padding:26px;backdrop-filter:blur(6px);box-shadow:var(--shadow)}
.hero-card h3{color:#fff;font-size:16px;margin-bottom:14px;display:flex;align-items:center;gap:8px}
.hero-card .kv{display:flex;justify-content:space-between;gap:12px;padding:11px 0;border-bottom:1px dashed rgba(255,255,255,.18);font-size:14px;color:#dceaf4}
.hero-card .kv:last-child{border-bottom:none}
.hero-card .kv b{color:#fff;font-weight:600;text-align:right}
.hero-badge{display:inline-flex;align-items:center;gap:8px;font-size:13px;color:#f3d9a8;background:rgba(200,146,46,.16);border:1px solid rgba(200,146,46,.4);padding:6px 12px;border-radius:999px;margin-bottom:18px}

/* ---------- 区块 ---------- */
section{padding:74px 0}
section.soft{background:var(--bg-soft)}
.sec-head{max-width:760px;margin-bottom:40px}
.sec-head.center{margin-left:auto;margin-right:auto;text-align:center}
.eyebrow{display:inline-block;font-size:13px;font-weight:700;letter-spacing:1.5px;color:var(--accent);text-transform:uppercase;margin-bottom:10px}
.sec-title{font-size:28px;font-weight:700;color:var(--ink)}
.sec-desc{margin-top:12px;color:var(--ink-2);font-size:16px}

/* ---------- 图标卡片 ---------- */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow-sm);transition:transform .2s var(--ease),box-shadow .2s var(--ease),border-color .2s var(--ease)}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#d3e0ec}
.card .ic{width:50px;height:50px;border-radius:13px;display:flex;align-items:center;justify-content:center;background:var(--bg-tint);color:var(--brand);margin-bottom:16px}
.card .ic svg{width:26px;height:26px}
.card h3{font-size:18px;font-weight:700;margin-bottom:8px}
.card h3 a{color:var(--ink)}
.card h3 a:hover{color:var(--brand);text-decoration:none}
.card p{font-size:14.5px;color:var(--ink-2)}
.card .more{display:inline-flex;align-items:center;gap:6px;margin-top:16px;font-size:14px;font-weight:600;color:var(--brand)}
.card .more svg{width:15px;height:15px;transition:transform .2s var(--ease)}
.card:hover .more svg{transform:translateX(3px)}

/* ---------- 两栏 + 列表 ---------- */
.cols{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start}
.list li{display:flex;gap:12px;padding:13px 0;border-bottom:1px dashed var(--line);font-size:15.5px;color:var(--ink-2)}
.list li:last-child{border-bottom:none}
.list li .dot{flex:none;width:8px;height:8px;border-radius:50%;background:var(--accent);margin-top:9px}
.list li b{color:var(--ink);font-weight:600}

/* ---------- 信任区 / 为什么选 ---------- */
.trust{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.trust .item{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow-sm)}
.trust .item .ic{width:46px;height:46px;border-radius:12px;background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;display:flex;align-items:center;justify-content:center;margin-bottom:14px}
.trust .item .ic svg{width:24px;height:24px}
.trust .item h4{font-size:16px;margin-bottom:6px}
.trust .item p{font-size:14px;color:var(--ink-2)}

/* ---------- 表格 ---------- */
.tbl{width:100%;border-collapse:collapse;font-size:15px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.tbl th,.tbl td{text-align:left;padding:14px 16px;border-bottom:1px solid var(--line);vertical-align:top}
.tbl tr:last-child th,.tbl tr:last-child td{border-bottom:none}
.tbl th{width:160px;color:var(--ink-3);font-weight:600;background:var(--bg-soft);white-space:nowrap}
.tbl td{color:var(--ink-2)}
.tbl details{font-size:14px}
.tbl summary{cursor:pointer;color:var(--brand);font-weight:600}
.tbl details>div{margin-top:10px;line-height:1.95}

/* ---------- 占位 / 说明框 ---------- */
.todo{display:inline-block;color:#8a5a00;background:#fdf5e3;border-left:3px solid #e0a800;padding:2px 9px;border-radius:3px;font-size:14px}
.notice{background:var(--bg-tint);border:1px solid var(--line);border-radius:var(--radius-sm);padding:20px 22px;font-size:14.5px;color:var(--ink-2)}
.notice b{color:var(--ink)}
.empty{border:1.5px dashed var(--line);border-radius:var(--radius);padding:46px 24px;text-align:center;color:var(--ink-3);background:var(--bg-soft);font-size:15.5px}
.empty .big{font-size:17px;color:var(--ink-2);font-weight:600;margin-bottom:8px}

/* ---------- 表单 ---------- */
.form{max-width:600px}
.field{margin-bottom:18px}
.field label{display:block;font-size:14px;color:var(--ink-2);margin-bottom:7px;font-weight:600}
.field input,.field select,.field textarea{
  width:100%;padding:11px 13px;border:1.5px solid var(--line);border-radius:10px;
  font-size:15px;font-family:inherit;background:#fff;color:var(--ink);transition:border-color .2s,box-shadow .2s;
}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(31,78,121,.12)}
.field textarea{min-height:104px;resize:vertical}
.btn-primary{background:var(--brand);color:#fff;border:none;padding:13px 30px;border-radius:10px;font-size:15px;font-weight:600;cursor:pointer;font-family:inherit;transition:background .2s,transform .15s,box-shadow .2s}
.btn-primary:hover{background:var(--brand-2);box-shadow:var(--shadow);transform:translateY(-1px)}
.privacy{margin-top:14px;font-size:13px;color:var(--ink-3);line-height:1.7}

/* ---------- 联系条 ---------- */
.contact-bar{background:var(--bg-tint);padding:40px 0}
.contact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;font-size:15px}
.contact-grid .k{font-size:13px;color:var(--ink-3);margin-bottom:6px;font-weight:600;letter-spacing:.5px}
.contact-grid .v{color:var(--ink);font-weight:600;font-size:16px}
.qr{width:180px;height:auto;border-radius:10px;border:1px solid var(--line);background:#fff;padding:6px;margin-top:8px}

/* ---------- 筛选 ---------- */
.filters{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:24px}
.filters select{padding:10px 14px;border:1.5px solid var(--line);border-radius:10px;font-size:14.5px;background:#fff;font-family:inherit;color:var(--ink-2)}

/* ---------- CTA 横幅 ---------- */
.cta-band{background:linear-gradient(135deg,var(--brand-dark),var(--brand));color:#fff;border-radius:var(--radius);padding:40px 44px;display:flex;align-items:center;justify-content:space-between;gap:28px;box-shadow:var(--shadow);flex-wrap:wrap}
.cta-band h2{color:#fff;font-size:23px}
.cta-band p{color:#d8e5ef;margin-top:8px;font-size:15px;max-width:560px}
.cta-band .btn-gold{white-space:nowrap}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--brand-dark);color:#c9d8e4;padding:46px 0 26px;font-size:14px}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:30px}
.site-footer h4{color:#fff;font-size:15px;font-weight:700;margin-bottom:12px}
.site-footer p,.site-footer li{color:#c9d8e4;font-size:14px}
.site-footer ul{list-style:none}
.site-footer a{color:#c9d8e4}
.site-footer a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.14);margin-top:30px;padding-top:18px;font-size:13px;color:#9fb6c8;display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap}

/* ---------- 滚动入场动画 ---------- */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s var(--ease),transform .6s var(--ease)}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  html{scroll-behavior:auto}
}

/* ---------- 404 ---------- */
.err404{text-align:center;padding:90px 0}
.err404 .code{font-size:88px;font-weight:800;color:var(--brand);line-height:1}
.err404 .sec-desc{margin:14px auto 26px}

/* ---------- 响应式 ---------- */
@media (max-width:920px){
  .hero .wrap{grid-template-columns:1fr;gap:32px;padding:56px 22px 60px}
  .hero h1{font-size:30px}
  .cards{grid-template-columns:1fr 1fr}
  .trust{grid-template-columns:1fr 1fr}
  .cols{grid-template-columns:1fr;gap:28px}
}
@media (max-width:760px){
  .nav-toggle{display:inline-flex}
  .site-nav{position:absolute;top:100%;left:0;right:0;background:#fff;flex-direction:column;align-items:stretch;gap:0;padding:8px 22px 16px;border-bottom:1px solid var(--line);box-shadow:var(--shadow-sm);
    max-height:0;overflow:hidden;transition:max-height .28s var(--ease);}
  .site-nav.open{max-height:420px}
  .site-nav a{padding:12px 0;border-bottom:1px solid var(--line)}
  .site-nav a::after{display:none}
  .site-nav .nav-tel{border-bottom:none;padding-top:14px}
  .header-inner{position:relative}
  section{padding:54px 0}
  .sec-title{font-size:24px}
  .cards,.trust{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .cta-band{padding:30px 26px;flex-direction:column;align-items:flex-start}
  .tbl th{width:120px}
  .footer-bottom{flex-direction:column}
}