/* =============================================================
   请师艺鉴 · 全站样式（纯静态 / 移动优先 / 零外链）
   色板：藏青 #1F3A5F · 朱红 #C0392B · 米白 #FAF7F2 · 深灰 #2B2B2B
   ============================================================= */

:root{
  --navy:#1F3A5F;
  --navy-700:#17304F;
  --navy-900:#122741;
  --accent:#C0392B;
  --accent-soft:#E05A4A;
  --bg:#FAF7F2;
  --text:#2B2B2B;
  --muted:#6E6E6E;
  --line:#E7DFD4;
  --card:#FFFFFF;
  --radius:14px;
  --shadow:0 2px 14px rgba(31,58,95,.08);
  --maxw:1120px;
  --font:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",sans-serif;
}

*,*::before,*::after{box-sizing:border-box}

html{
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
}

body{
  margin:0;
  font-family:var(--font);
  font-size:16px;
  line-height:1.8;
  color:var(--text);
  background:var(--bg);
  /* 兜底：杜绝任何横向溢出导致的横向滚动 */
  overflow-x:hidden;
}

h1,h2,h3,h4,p,ul,ol,figure{margin:0}
ul{padding:0;list-style:none}
img{max-width:100%;height:auto;display:block}
a{color:var(--navy);text-decoration:none}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}

/* ---------- 布局容器 ---------- */
.wrap{
  width:100%;
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 20px;
}

.section{padding:52px 0}
.section + .section{border-top:1px solid var(--line)}
.section--tint{background:#FFF}
[id]{scroll-margin-top:76px}

/* ---------- 顶栏 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:50;
  background:rgba(250,247,242,.94);
  border-bottom:1px solid var(--line);
  -webkit-backdrop-filter:saturate(160%) blur(8px);
  backdrop-filter:saturate(160%) blur(8px);
}
.header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  min-height:64px;
}
.brand{display:flex;align-items:center;flex:0 0 auto}
.brand img{height:38px;width:auto}

.nav-toggle{
  display:inline-flex;
  flex-direction:column;
  justify-content:center;
  gap:5px;
  width:44px;
  height:44px;
  padding:0;
  border:1px solid var(--line);
  border-radius:10px;
  background:#FFF;
  cursor:pointer;
  -webkit-appearance:none;
  appearance:none;
}
.nav-toggle span{
  display:block;
  width:20px;
  height:2px;
  margin:0 auto;
  background:var(--navy);
  border-radius:2px;
  transition:transform .2s ease,opacity .2s ease;
}
.nav-toggle.is-active span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.is-active span:nth-child(2){opacity:0}
.nav-toggle.is-active span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

.site-nav{
  display:none;
  position:absolute;
  left:0;
  right:0;
  top:100%;
  background:#FFF;
  border-bottom:1px solid var(--line);
  box-shadow:var(--shadow);
}
.site-nav.is-open{display:block}
.site-nav ul{padding:6px 20px 14px}
.site-nav li + li{border-top:1px solid #F3EEE7}
.site-nav a{
  display:block;
  padding:13px 2px;
  font-size:16px;
  color:var(--navy);
}
.site-nav a:hover{color:var(--accent)}
.site-nav a[aria-current="page"]{color:var(--accent);font-weight:700}

/* ---------- 首屏 Hero ---------- */
.hero{
  position:relative;
  overflow:hidden;
  padding:60px 0 68px;
  color:#F3EFE9;
  background:linear-gradient(160deg,#1F3A5F 0%,#17304F 58%,#122741 100%);
}
.hero::after{
  content:"";
  position:absolute;
  right:-90px;
  top:-70px;
  width:300px;
  height:300px;
  border-radius:50%;
  background:radial-gradient(circle at 32% 32%,rgba(192,57,43,.55),rgba(192,57,43,0) 70%);
  pointer-events:none;
}
.hero-inner{position:relative;z-index:1;max-width:780px}
.hero h1{
  font-size:28px;
  line-height:1.45;
  font-weight:700;
  letter-spacing:.5px;
}
.hero h1 .dot{color:var(--accent-soft);margin:0 2px}
.hero .sub{
  margin-top:16px;
  font-size:15.5px;
  color:#DCD6CE;
}
.hero .value{
  display:inline-block;
  margin-top:24px;
  padding:12px 16px;
  border-left:3px solid var(--accent-soft);
  border-radius:0 10px 10px 0;
  background:rgba(255,255,255,.07);
  font-size:16.5px;
  font-weight:600;
}
.hero-actions{margin-top:30px;display:flex;flex-wrap:wrap;gap:12px}
.btn{
  display:inline-block;
  padding:12px 22px;
  border-radius:999px;
  font-size:15px;
  font-weight:600;
  transition:transform .15s ease,background .15s ease;
}
.btn:active{transform:translateY(1px)}
.btn--primary{background:var(--accent);color:#FFF}
.btn--ghost{border:1px solid var(--line);color:var(--navy);background:rgba(255,255,255,.65)}
.hero .btn--ghost,
.contact .btn--ghost{border-color:rgba(243,239,233,.45);color:#F3EFE9;background:transparent}

/* ---------- 通用段落标题 ---------- */
.section-head{max-width:760px;margin-bottom:30px}
.eyebrow{
  display:inline-block;
  font-size:12.5px;
  letter-spacing:2px;
  font-weight:700;
  color:var(--accent);
}
.section-head h2{
  margin-top:8px;
  font-size:23px;
  line-height:1.45;
  color:var(--navy);
}
.section-head p{margin-top:10px;font-size:15px;color:var(--muted)}

/* ---------- 卡片栅格 ---------- */
.grid{display:grid;gap:16px}
.grid--3{grid-template-columns:1fr}
.grid--auto{grid-template-columns:repeat(auto-fit,minmax(210px,1fr))}

.card{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:22px 20px;
  box-shadow:var(--shadow);
}
.card h3{
  font-size:18px;
  color:var(--navy);
  display:flex;
  align-items:center;
  gap:10px;
}
.card p{margin-top:10px;font-size:15px;color:var(--muted)}

.card--pos{border-top:3px solid var(--navy)}
.card--pos .idx{
  flex:0 0 auto;
  width:26px;
  height:26px;
  border-radius:50%;
  background:var(--navy);
  color:#FFF;
  font-size:13px;
  font-weight:700;
  display:inline-flex;
  align-items:center;
  justify-content:center;
}

.cat{border-top:3px solid var(--navy)}
.cat .ico{font-size:22px;line-height:1}
.cat h3{font-size:17px}
.cat p{font-size:14.5px;margin-top:8px}

/* ---------- 专家机制 · 三节点飞轮 ---------- */
.flow{display:flex;flex-direction:column}
.node{
  flex:1;
  background:#FFF;
  border:1px solid var(--line);
  border-left:4px solid var(--accent);
  border-radius:var(--radius);
  padding:20px;
  box-shadow:var(--shadow);
}
.node .tag{
  display:inline-block;
  margin-bottom:8px;
  padding:2px 10px;
  border-radius:999px;
  background:rgba(192,57,43,.1);
  color:var(--accent);
  font-size:12.5px;
  font-weight:700;
}
.node h3{font-size:17px;color:var(--navy)}
.node p{margin-top:8px;font-size:14.5px;color:var(--muted)}
.flow-arrow{
  text-align:center;
  color:var(--accent);
  font-size:22px;
  line-height:1;
  padding:10px 0;
}
.flow-arrow::before{content:"\2193"}

/* ---------- 联系我们 ---------- */
.contact{
  background:linear-gradient(160deg,#1F3A5F 0%,#17304F 100%);
  color:#EDE8E1;
}
.contact .section-head h2{color:#FFF}
.contact .section-head p{color:#B9C4D3}
.contact .eyebrow{color:var(--accent-soft)}
.contact-box{
  border:1px solid rgba(255,255,255,.16);
  border-radius:var(--radius);
  background:rgba(255,255,255,.06);
  padding:22px 20px;
}
.info-list{display:grid;gap:12px}
.info-item{
  display:flex;
  flex-wrap:wrap;
  gap:4px 12px;
  font-size:15px;
  line-height:1.7;
}
.info-item .k{color:#A8B6C6;min-width:78px;flex:0 0 auto}
.info-item .v{color:#F3EFE9;word-break:break-word}
.contact .ph{color:#F0A79C;font-weight:600}
.note{margin-top:16px;font-size:13px;color:#A8B6C6}

/* ---------- 关于页 ---------- */
.prose{max-width:820px}
.prose p + p{margin-top:16px}
.prose p{font-size:15.5px;color:#3A3A3A}
.mission{
  margin-top:26px;
  padding:18px 20px;
  border-left:4px solid var(--accent);
  border-radius:0 12px 12px 0;
  background:#FFF;
  box-shadow:var(--shadow);
  font-size:17px;
  font-weight:600;
  color:var(--navy);
}
.facts{display:grid;gap:14px;margin-top:26px;grid-template-columns:repeat(auto-fit,minmax(160px,1fr))}
.fact{
  background:#FFF;
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:18px 16px;
  text-align:center;
}
.fact .num{font-size:26px;font-weight:700;color:var(--accent);line-height:1.3}
.fact .lbl{margin-top:4px;font-size:13.5px;color:var(--muted)}

/* ---------- 页脚 ---------- */
.site-footer{
  background:var(--navy-900);
  color:#93A0AF;
  padding:26px 0;
  font-size:13px;
}
.site-footer .wrap{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:6px;
  text-align:center;
}
.site-footer a{color:#93A0AF;border-bottom:1px dashed rgba(147,160,175,.45)}
.site-footer a:hover{color:#CBD5E0}

/* ---------- 小屏微调（≤360px） ---------- */
@media (max-width:359px){
  .hero h1{font-size:24px}
  .brand img{height:32px}
}

/* ---------- 平板 / 桌面 ---------- */
@media (min-width:700px){
  .grid--3{grid-template-columns:repeat(3,1fr)}
  .section{padding:64px 0}
}

@media (min-width:768px){
  .nav-toggle{display:none}
  .site-nav{
    display:block;
    position:static;
    background:none;
    border:0;
    box-shadow:none;
  }
  .site-nav ul{display:flex;align-items:center;gap:28px;padding:0}
  .site-nav li + li{border-top:0}
  .site-nav a{
    position:relative;
    padding:8px 0;
    font-size:15px;
  }
  .site-nav a::after{
    content:"";
    position:absolute;
    left:0;
    right:0;
    bottom:2px;
    height:2px;
    background:var(--accent);
    transform:scaleX(0);
    transition:transform .2s ease;
  }
  .site-nav a:hover::after,
  .site-nav a[aria-current="page"]::after{transform:scaleX(1)}
}

@media (min-width:900px){
  .hero{padding:84px 0 92px}
  .hero h1{font-size:38px}
  .hero .sub{font-size:17px}
  .hero .value{font-size:18px}
  .section-head h2{font-size:28px}

  .flow{flex-direction:row;align-items:stretch}
  .flow-arrow{align-self:center;padding:0 12px;font-size:24px}
  .flow-arrow::before{content:"\2192"}
}

/* ---------- 打印友好 ---------- */
@media print{
  .site-header,.nav-toggle{position:static}
  .hero{background:#FFF;color:#000}
}