/* 心陪伴-伴学 落地页样式：移动优先、无外部依赖、首屏轻量
   配色：品牌靛蓝→紫渐变 #5B6EF5→#764BA2 + 橙色 CTA #FF9A52→#F2711C + 深靛墨 + 暖白底 */
:root{
  --ink:#1f2436; --ink-2:#5a6478; --line:#e8e6f2; --bg:#fbfaf8; --soft:#f4f3fa;
  --brand:#5b6ef5; --brand-d:#4656e0; --brand-2:#764ba2; --orange:#f2711c; --orange-2:#ff9a52;
  --hero-1:#0b1226; --hero-2:#1b2a52; --hero-3:#2a2e6e;
  --radius:14px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.75;-webkit-text-size-adjust:100%}
img{max-width:100%;height:auto;display:block}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:1080px;margin:0 auto;padding:0 18px}
h1{font-size:30px;line-height:1.3;margin:.2em 0 .5em}
h2{font-size:22px;line-height:1.4;margin:0 0 .6em}
h3{font-size:16px;margin:0 0 .35em}
p{margin:0 0 1em}
.muted{color:var(--ink-2)}
.mini{font-size:13px;color:var(--ink-2)}
.more{font-weight:600}
/* 顶栏：白底 + 品牌渐变 logo 圆角 */
.site-head{display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:12px 18px;border-bottom:1px solid var(--line);position:sticky;top:0;background:rgba(251,250,248,.96);
  backdrop-filter:blur(8px);z-index:9}
.brand{display:flex;align-items:center;gap:9px;font-weight:700;color:var(--ink);font-size:16px}
.brand img{width:34px;height:34px;object-fit:cover;border-radius:8px}
.nav{display:flex;gap:14px;overflow-x:auto;scrollbar-width:none}
.nav::-webkit-scrollbar{display:none}
.nav a{color:var(--ink-2);font-size:14px;white-space:nowrap;font-weight:500}
.nav a:hover{color:var(--brand)}
/* Hero：深靛渐变 + 白字（保持第一版定稿的深色 Hero 语言） */
.hero{background:linear-gradient(135deg,var(--hero-1) 0%,var(--hero-2) 55%,var(--hero-3) 100%);
  color:#fff;padding:40px 0 34px;position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;right:-120px;top:-120px;width:340px;height:340px;border-radius:50%;
  background:radial-gradient(circle,rgba(91,110,245,.35),transparent 70%);pointer-events:none}
.hero.small{padding:30px 0}
.hero-grid{display:grid;gap:24px;align-items:center;position:relative;z-index:1}
.hero .lead{font-size:17px;color:rgba(255,255,255,.82);max-width:46em}
.hero .mini{color:rgba(255,255,255,.55)}
.hero-img{margin:0;border-radius:var(--radius);overflow:hidden;box-shadow:0 14px 40px rgba(4,8,24,.5);
  border:1px solid rgba(255,255,255,.14)}
.hero-img img{width:100%}
.cta-row{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:18px 0 12px}
.btn{display:inline-block;padding:11px 20px;border-radius:12px;font-weight:700;font-size:15px;border:1px solid transparent}
.btn.primary{background:linear-gradient(135deg,var(--orange-2),var(--orange));color:#fff;
  box-shadow:0 6px 16px rgba(242,113,28,.35)}
.btn.primary:hover{filter:brightness(1.06);text-decoration:none}
.btn.ghost{border-color:rgba(255,255,255,.65);color:#fff;background:rgba(255,255,255,.06)}
.btn.ghost:hover{background:rgba(255,255,255,.14);text-decoration:none}
.btn.link{color:rgba(255,255,255,.75);padding-left:4px}
/* 正文区块：暖白底 + 实色渐变卡片语言 */
.section{padding:40px 0}
.section.alt{background:var(--soft)}
.section h2{margin-bottom:18px}
.grid{display:grid;gap:14px}
.fact,.safe,.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:18px 16px 14px;
  box-shadow:0 3px 12px rgba(31,36,54,.05)}
.fact,.safe{border-top:3px solid transparent}
.fact{border-image:linear-gradient(135deg,var(--brand),var(--brand-2)) 1}
.safe-grid .safe{background:#fdf6f2;border-color:#f5dfcf;border-image:linear-gradient(135deg,var(--orange-2),var(--orange)) 1}
.card{display:block;color:var(--ink)}
.card:hover{border-color:var(--brand);text-decoration:none;box-shadow:0 8px 22px rgba(91,110,245,.16)}
.card .more{color:var(--brand)}
.two{grid-template-columns:1fr}
.steps{list-style:none;margin:0;padding:0;display:grid;gap:12px}
.steps li{display:flex;gap:12px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:14px 16px;
  box-shadow:0 3px 12px rgba(31,36,54,.05)}
.steps .num{flex:0 0 28px;height:28px;border-radius:50%;background:linear-gradient(135deg,var(--brand),var(--brand-2));
  color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:14px}
.steps h3{margin-bottom:.2em}
.steps p{margin:0;color:var(--ink-2);font-size:15px}
.bullets{margin:0;padding-left:20px;color:var(--ink-2)}
.bullets li{margin-bottom:8px}
.qa-list{display:grid;gap:10px}
.qa{background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px 16px;box-shadow:0 3px 12px rgba(31,36,54,.05)}
.qa summary{cursor:pointer;font-weight:600;list-style:none}
.qa summary::-webkit-details-marker{display:none}
.qa summary::after{content:"＋";float:right;color:var(--brand)}
.qa[open] summary::after{content:"－"}
.qa p{margin:.6em 0 .2em;color:var(--ink-2)}
/* 尾部 CTA 面板：品牌渐变底 + 白字 */
.cta-panel{background:linear-gradient(135deg,var(--brand) 0%,var(--brand-2) 100%);color:#fff;
  border-radius:var(--radius);padding:26px 22px;box-shadow:0 12px 32px rgba(91,110,245,.3)}
.cta-panel .muted{color:rgba(255,255,255,.8)}
.qr-placeholder{display:inline-flex;flex-direction:column;align-items:center;justify-content:center;
  width:132px;height:132px;border:1px dashed rgba(255,255,255,.6);border-radius:12px;background:rgba(255,255,255,.12);
  color:#fff;font-size:13px;text-align:center;padding:8px}
.qr-placeholder small{font-size:11px;color:rgba(255,255,255,.65)}
/* 真实小程序码：白底卡片保证扫码对比度 */
.qr{margin:0;background:#fff;border-radius:14px;padding:14px;display:inline-flex;flex-direction:column;
  align-items:center;gap:8px;box-shadow:0 10px 24px rgba(4,8,24,.28)}
.qr img{width:180px;height:180px;border-radius:8px;display:block}
.qr figcaption{font-size:13px;color:var(--ink-2);text-align:center;line-height:1.5;font-weight:600}
.cases-empty{max-width:720px}
/* Footer：深靛底 + 品牌渐变顶线 */
.site-foot{border-top:none;padding:28px 0 34px;background:#141a33;color:#c8cde8;position:relative}
.site-foot::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;
  background:linear-gradient(90deg,var(--brand),var(--brand-2),var(--orange))}
.site-foot p{margin:0 0 6px;font-size:14px}
.site-foot .muted{color:#9aa3cc}
.site-foot strong{color:#fff}
@media (min-width:760px){
  h1{font-size:40px}
  h2{font-size:26px}
  .grid.facts{grid-template-columns:repeat(2,1fr)}
  .grid.safe-grid{grid-template-columns:repeat(4,1fr)}
  .two{grid-template-columns:repeat(2,1fr)}
  .hero-grid{grid-template-columns:1.15fr .85fr}
  .steps{grid-template-columns:repeat(2,1fr)}
  .qa-list{grid-template-columns:repeat(2,1fr)}
}
@media (prefers-color-scheme:dark){
  :root{--ink:#e8eaf5;--ink-2:#a9b0cc;--line:#2a2f4a;--bg:#12152a;--soft:#171b33}
  .site-head{background:rgba(18,21,42,.96)}
  .fact,.safe,.card,.qa,.steps li{background:#171b33;box-shadow:0 3px 12px rgba(0,0,0,.3)}
  .card{color:var(--ink)}
  .safe-grid .safe{background:#1e1a2c;border-color:#3a2f4a}
  .hero{background:linear-gradient(135deg,#080d1c 0%,#14213f 55%,#232660 100%)}
  .btn.ghost:hover{background:rgba(255,255,255,.14)}
  .cta-panel{box-shadow:0 12px 32px rgba(0,0,0,.4)}
  .site-foot{background:#0c0f22}
}