/* 查克编程官网 — 青玉融合风（与家长小程序同一套设计语言）
   1) 立体感靠「厚底边 + 下沉按压」，不用阴影模拟点击
   2) 中式素雅色板 + 中圆角 + 650/700 字重
   3) 状态色固定含义：绿=已掌握 蓝=进行中 金=待巩固 灰=未开始 */
:root{
  --primary:#4d8b62;        /* 青玉绿 */
  --primary-dark:#39714d;   /* 厚底边 / 深压色 */
  --primary-light:#e8f4ec;
  --primary-soft:#dcefe3;
  --accent:#4a7fa5;         /* 黛蓝 = 进行中 */
  --accent-deep:#22609a;
  --accent-soft:#e7f0fa;
  --gold:#c39a4a;           /* 赭金 = 待巩固 */
  --gold-deep:#795713;
  --gold-soft:#fff1cd;
  --bg:#ffffff;
  --bg-soft:#f6f8f5;        /* 雾绿米白，小程序 page 背景 */
  --bg-muted:#eef1ef;
  --text:#28332c;           /* 黛黑 */
  --text-secondary:#4c5a52;
  --text-muted:#71807a;
  --border:#e5eae6;
  --border-strong:#d3dbd6;
  --edge:4px;               /* 厚底边厚度 */
  --radius-sm:8px;
  --radius:10px;
  --radius-lg:14px;
  --radius-xl:18px;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;max-width:100%;overflow-x:hidden}
body{
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",-apple-system,BlinkMacSystemFont,system-ui,sans-serif;
  color:var(--text);
  background:var(--bg);
  max-width:100%;overflow-x:hidden;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block}

.container{width:100%;max-width:1200px;margin:0 auto;padding:0 24px}
section{padding:100px 0}
@media(max-width:768px){section{padding:64px 0}}

/* ========== 通用标题 ========== */
.section-head{text-align:center;margin-bottom:64px}
.section-head h2{
  font-size:40px;font-weight:800;line-height:1.3;letter-spacing:-.01em;
  margin-bottom:16px;
}
.section-sub{font-size:17px;color:var(--text-secondary);max-width:640px;margin:0 auto}
@media(max-width:768px){
  .section-head h2{font-size:28px}
  .section-sub{font-size:15px}
  .section-head{margin-bottom:48px}
}

/* ========== 按钮 ========== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:13px 28px;border-radius:var(--radius);font-size:15px;font-weight:700;
  letter-spacing:1px;cursor:pointer;white-space:nowrap;
  border:1px solid transparent;border-bottom-width:var(--edge);
  transition:transform .12s ease,border-bottom-width .12s ease,background .2s ease;
}
.btn-primary{background:var(--primary);color:#fff;border-color:var(--primary-dark)}
.btn-primary:hover{background:#457d59}
.btn-secondary{background:#fff;color:var(--accent);border-color:var(--border);border-bottom-color:var(--border-strong)}
.btn-secondary:hover{border-color:var(--primary);border-bottom-color:var(--primary);color:var(--primary)}
/* 按下时下沉：底边收窄 + 整体下移，和小程序 .button-pressed 一致 */
.btn:active{transform:translateY(2px);border-bottom-width:2px}
.btn-large{padding:17px 36px;font-size:16px;border-radius:var(--radius-lg)}
.cta-row{display:flex;gap:16px;flex-wrap:wrap}
.cta-row-center{justify-content:center}

/* ========== 占位符 ========== */
.placeholder{
  background:linear-gradient(135deg,#f8fafc 0%,#eff6ff 100%);
  border:2px dashed #c7d2fe;
  border-radius:var(--radius-lg);
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  color:var(--text-muted);text-align:center;padding:32px;
  position:relative;overflow:hidden;
}
.placeholder::before{
  content:"";position:absolute;inset:0;
  background-image:
    linear-gradient(rgba(77,139,98,.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(77,139,98,.05) 1px,transparent 1px);
  background-size:24px 24px;
  pointer-events:none;
}
.placeholder-icon{
  font-size:48px;color:var(--primary);opacity:.4;margin-bottom:12px;
  position:relative;z-index:1;
}
.placeholder-label{
  font-size:14px;font-weight:700;color:var(--primary-dark);
  background:rgba(255,255,255,.9);padding:6px 14px;border-radius:999px;
  margin-bottom:8px;position:relative;z-index:1;
}
.placeholder-desc{font-size:14px;color:var(--text-muted);position:relative;z-index:1}
.placeholder-hero{aspect-ratio:4/3;width:100%}
.placeholder-step{aspect-ratio:4/3;width:100%;margin-top:16px}
.placeholder-large{aspect-ratio:16/9;width:100%;max-width:980px;margin:0 auto}

/* ========== 导航 ========== */
.nav{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.94);backdrop-filter:blur(12px);
  border-bottom:1px solid var(--border);
}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:68px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:20px;color:var(--text)}
.logo-mark{
  width:34px;height:34px;border-radius:var(--radius-sm);
  display:block;flex:0 0 34px;
}
.nav-actions{display:flex;align-items:center;gap:18px}
.nav-link{font-size:14px;font-weight:650;color:var(--accent)}
.nav-link:hover{color:var(--accent-deep)}
.nav-cta{
  padding:9px 22px;background:var(--primary);color:#fff;
  border-radius:var(--radius);font-size:14px;font-weight:700;letter-spacing:1px;
  border:1px solid var(--primary-dark);border-bottom-width:var(--edge);
  transition:transform .12s ease,border-bottom-width .12s ease,background .2s ease;
}
.nav-cta:hover{background:#457d59}
.nav-cta:active{transform:translateY(2px);border-bottom-width:2px}
@media(max-width:520px){
  .nav-link{display:none}
}

/* ========== Hero ========== */
.hero{
  padding:90px 0 110px;
  background:linear-gradient(180deg,var(--bg-soft) 0%,#fff 100%);
  position:relative;overflow:hidden;
}
/* 青玉风不用光晕堆深度，改用一条细分隔线收住 hero */
.hero{border-bottom:1px solid var(--border)}
.hero-grid{
  display:grid;grid-template-columns:1.05fr 1fr;
  gap:64px;align-items:center;position:relative;z-index:1;
}
.hero-grid > *{min-width:0}
.tag{
  display:inline-flex;align-items:center;gap:8px;
  padding:7px 16px;background:var(--primary-light);color:#287044;
  border-radius:999px;font-size:13px;font-weight:700;letter-spacing:1px;margin-bottom:24px;
}
.tag::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--primary)}
h1{
  font-size:54px;font-weight:700;line-height:1.2;
  letter-spacing:-.01em;margin-bottom:24px;
}
/* 不用渐变文字（小程序无此语言），改实色青玉绿 */
h1 .accent{color:var(--primary)}
.hero-sub{font-size:20px;color:var(--text-secondary);margin-bottom:20px;font-weight:500}
.hero-text{font-size:16px;color:var(--text-muted);margin-bottom:40px;max-width:560px;line-height:1.8}
.hero-meta{
  display:flex;align-items:center;gap:24px;
  margin-top:48px;padding-top:32px;border-top:1px solid var(--border);
}
.meta-item{display:flex;flex-direction:column;gap:4px}
.meta-num{font-size:24px;font-weight:800;color:var(--primary)}
.meta-label{font-size:13px;color:var(--text-muted)}
.meta-divider{width:1px;height:32px;background:var(--border)}
.hero-visual{position:relative}

@media(max-width:1024px){
  .hero-grid{grid-template-columns:1fr;gap:48px}
  h1{font-size:40px}
}
@media(max-width:768px){
  .hero{padding:60px 0 80px}
  h1{font-size:32px}
  .hero-sub{font-size:17px;overflow-wrap:anywhere}
  .hero-text{overflow-wrap:anywhere}
  .hero-meta{flex-wrap:wrap;gap:16px}
  .meta-num{font-size:20px}
}

/* ========== 痛点 ========== */
.pain{background:#fff}
.pain-grid{
  display:grid;grid-template-columns:repeat(3,1fr);
  gap:24px;margin-bottom:56px;
}
.pain-card{
  background:#fff;border:1px solid var(--border);border-bottom-width:3px;
  border-radius:var(--radius-lg);
  padding:36px 32px;transition:border-color .2s ease;position:relative;
}
.pain-card:hover{border-color:#ead7a8;border-bottom-color:#c39a4a}
/* 痛点 = 待巩固语义 → 用赭金，不另造红色 */
.pain-icon{
  width:48px;height:48px;border-radius:var(--radius);
  background:var(--gold-soft);color:var(--gold-deep);
  display:flex;align-items:center;justify-content:center;
  font-size:22px;font-weight:700;margin-bottom:20px;
}
.pain-card h3{font-size:19px;font-weight:700;margin-bottom:12px;line-height:1.4}
.pain-card p{font-size:15px;color:var(--text-secondary);line-height:1.75}
.transition{
  text-align:center;padding:32px;
  background:var(--primary-light);border:1px solid #cfe3d6;border-bottom-width:var(--edge);
  border-radius:var(--radius-xl);
}
.transition p{font-size:20px;color:var(--text);font-weight:500}
.transition strong{color:#287044;font-weight:700}

@media(max-width:900px){.pain-grid{grid-template-columns:1fr}}
@media(max-width:768px){.transition p{font-size:16px}}

/* ========== 流程 ========== */
.flow{background:var(--bg-soft)}
.flow-grid{
  display:grid;
  grid-template-columns:1fr auto 1fr auto 1fr auto 1fr;
  gap:20px;align-items:start;
}
.flow-step{
  background:#fff;border:1px solid var(--border);border-bottom-width:3px;
  border-radius:var(--radius-lg);
  padding:28px 24px;text-align:center;transition:border-color .2s ease;
  display:flex;flex-direction:column;height:100%;
}
.flow-step:hover{border-color:var(--primary);border-bottom-color:var(--primary-dark)}
.step-num{
  width:44px;height:44px;border-radius:var(--radius);
  background:var(--accent-soft);color:var(--accent-deep);
  display:flex;align-items:center;justify-content:center;
  font-size:15px;font-weight:700;margin:0 auto 16px;
}
.flow-step h3{font-size:17px;font-weight:700;margin-bottom:8px;line-height:1.4}
.flow-arrow{
  display:flex;align-items:center;justify-content:center;
  font-size:28px;color:var(--primary);font-weight:300;
  padding-top:80px;opacity:.5;
}
@media(max-width:1024px){
  .flow-grid{grid-template-columns:1fr 1fr;gap:24px}
  .flow-arrow{display:none}
}
@media(max-width:600px){
  .flow-grid{grid-template-columns:1fr}
}

/* ========== 核心价值 ========== */
.value{background:#fff}
.value-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:28px;
}
.value-card{
  background:#fff;
  border:1px solid var(--border);border-bottom-width:var(--edge);
  border-radius:var(--radius-xl);
  padding:40px 32px;transition:border-color .2s ease;position:relative;
}
.value-card:hover{border-color:var(--primary);border-bottom-color:var(--primary-dark)}
.value-tag{
  display:inline-block;padding:5px 12px;
  background:var(--primary-light);color:#287044;
  border-radius:999px;font-size:12px;font-weight:700;letter-spacing:1px;margin-bottom:20px;
}
.value-card h3{font-size:24px;font-weight:700;margin-bottom:14px}
.value-card p{font-size:15px;color:var(--text-secondary);line-height:1.8;margin-bottom:24px}
.value-stat{
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 18px;background:var(--primary-soft);
  color:#155a32;border-radius:var(--radius);
  font-size:14px;font-weight:700;
}
@media(max-width:900px){.value-grid{grid-template-columns:1fr}}

/* ========== 家长报告 ========== */
.report{background:var(--bg-soft);position:relative}
.report-showcase{margin-bottom:40px;position:relative;z-index:1}
.report-tags{display:flex;flex-wrap:wrap;justify-content:center;gap:12px;position:relative;z-index:1}
.report-tag{
  padding:9px 22px;background:#fff;border:1px solid var(--border);border-bottom-width:3px;
  border-radius:999px;font-size:14px;color:var(--text-secondary);font-weight:650;
  transition:border-color .2s ease,color .2s ease;
}
.report-tag:hover{
  border-color:var(--primary);border-bottom-color:var(--primary-dark);
  color:#287044;background:var(--primary-light);
}

/* ========== 教师后台 ========== */
.dashboard{background:#fff}
.dashboard-showcase{position:relative}

/* ========== 为什么选择 ========== */
.why{background:var(--bg-soft)}
.why-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:20px;
  max-width:960px;margin:0 auto;
}
.why-item{
  display:flex;align-items:center;gap:14px;
  background:#fff;border:1px solid var(--border);border-bottom-width:3px;
  border-radius:var(--radius);
  padding:20px 24px;transition:border-color .2s ease;
  font-size:16px;font-weight:650;color:var(--text);
}
.why-item:hover{border-color:var(--primary);border-bottom-color:var(--primary-dark)}
/* ✓ = 已掌握语义 → 绿底深绿字 */
.check{
  width:28px;height:28px;border-radius:50%;
  background:var(--primary-light);color:#287044;
  display:flex;align-items:center;justify-content:center;
  font-size:14px;font-weight:700;flex-shrink:0;
}
@media(max-width:900px){.why-grid{grid-template-columns:1fr 1fr}}
@media(max-width:600px){.why-grid{grid-template-columns:1fr}}

/* ========== CTA Section ========== */
.cta-section{padding:80px 0}
/* 与小程序首页 .cta-card 一致：实色青玉 + 深色厚底边，不用渐变/光晕 */
.cta-card{
  background:var(--primary);
  border:1px solid var(--primary-dark);border-bottom-width:8px;
  border-radius:var(--radius-xl);
  padding:76px 48px;text-align:center;color:#fff;
  position:relative;
}
.cta-card h2{
  font-size:42px;font-weight:700;line-height:1.3;
  margin-bottom:18px;position:relative;z-index:1;
}
.cta-card p{
  font-size:18px;color:var(--primary-soft);
  margin-bottom:40px;position:relative;z-index:1;
}
.cta-card .btn-primary{
  background:#fff;color:#287044;border-color:rgba(0,0,0,.18);
}
.cta-card .btn-primary:hover{background:var(--primary-soft);color:#155a32}
.cta-card .btn-secondary{
  background:transparent;color:#fff;border-color:rgba(255,255,255,.4);
}
.cta-card .btn-secondary:hover{
  background:rgba(255,255,255,.1);border-color:#fff;color:#fff;
}
.qr-block{
  display:inline-flex;align-items:center;gap:24px;
  margin-top:48px;padding:24px 32px;
  background:rgba(255,255,255,.12);
  border:1px solid rgba(255,255,255,.24);border-bottom-width:var(--edge);
  border-radius:var(--radius-lg);
  position:relative;z-index:1;
}
.qr-placeholder{
  width:120px;height:120px;background:#fff;border-radius:12px;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  color:var(--text-muted);
}
.qr-icon{font-size:36px;color:var(--primary);opacity:.5;margin-bottom:6px}
.qr-label{font-size:12px;font-weight:600;color:var(--primary-dark)}
.qr-text{text-align:left}
.qr-title{font-size:18px;font-weight:700;margin-bottom:6px}
.qr-desc{font-size:14px;color:rgba(255,255,255,.85)}

@media(max-width:768px){
  .cta-card{padding:56px 28px}
  .cta-card h2{font-size:28px}
  .cta-card p{font-size:16px}
  .qr-block{flex-direction:column;gap:16px;padding:24px}
  .qr-text{text-align:center}
}

/* ========== Footer ========== */
.footer{
  background:#28332c;color:#cdd6cf;   /* 黛黑，取自小程序文字色 */
  padding:64px 0 40px;
}
.footer-link{
  display:inline-block;margin-top:14px;font-size:13px;font-weight:650;
  color:#a8c4b2;border-bottom:1px solid rgba(168,196,178,.35);padding-bottom:2px;
}
.footer-link:hover{color:#dcefe3;border-bottom-color:#dcefe3}
.footer-inner{
  display:flex;align-items:center;justify-content:space-between;
  flex-wrap:wrap;gap:32px;
}
.footer-brand .logo{color:#fff;margin-bottom:16px}
.footer-tag{
  font-size:16px;font-weight:600;color:#fff;margin-bottom:6px;
}
.footer-desc{font-size:14px;color:#9aa89f;line-height:1.7}
.footer-copy{font-size:13px;color:#7c8a81;text-align:right}
.footer-icp{
  margin-top:10px;font-size:12px;color:#7c8a81;
  display:flex;align-items:center;gap:8px;flex-wrap:wrap;justify-content:flex-end;
}
.footer-icp a{
  color:#9aa89f;display:inline-flex;align-items:center;gap:6px;
  transition:color .2s;
}
.footer-icp a:hover{color:#cdd6cf}
.icp-divider{color:#5d6b62}
.icp-badge{width:14px;height:14px;display:inline-block}

@media(max-width:768px){
  .footer-inner{flex-direction:column;text-align:center;align-items:center}
  .footer-brand .logo{justify-content:center}
  .footer-copy{text-align:center}
  .footer-icp{justify-content:center}
}

/* ========== 滚动动效 ========== */
@keyframes fadeUp{
  from{opacity:0;transform:translateY(20px)}
  to{opacity:1;transform:translateY(0)}
}
.hero-text-wrap > *{animation:fadeUp .8s ease both}
.hero-text-wrap > *:nth-child(1){animation-delay:.05s}
.hero-text-wrap > *:nth-child(2){animation-delay:.15s}
.hero-text-wrap > *:nth-child(3){animation-delay:.25s}
.hero-text-wrap > *:nth-child(4){animation-delay:.35s}
.hero-text-wrap > *:nth-child(5){animation-delay:.45s}
.hero-text-wrap > *:nth-child(6){animation-delay:.55s}
.hero-visual{animation:fadeUp 1s ease .3s both}

/* ========== 截图样式 ========== */
.shot{
  width:100%;display:block;border-radius:var(--radius-lg);
  background:#fff;
}
.shot-hero{
  width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:var(--radius-lg);
  border:1px solid var(--border);border-bottom-width:var(--edge);
}
.shot-step{
  margin-top:16px;border-radius:var(--radius);
  border:1px solid var(--border);border-bottom-width:3px;
  aspect-ratio:4/3;object-fit:cover;
}
.shot-large{
  width:100%;max-width:980px;margin:0 auto;
  border-radius:var(--radius-lg);
  border:1px solid var(--border);border-bottom-width:var(--edge);
}
.report-showcase-dual{
  display:flex;flex-direction:column;gap:24px;align-items:center;
  margin-bottom:40px;position:relative;z-index:1;
}
.report-showcase-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:20px;
  max-width:1100px;margin:0 auto 40px;position:relative;z-index:1;
}
.report-showcase-grid .shot-tile:nth-child(1),
.report-showcase-grid .shot-tile:nth-child(2){
  grid-column:span 1;
}
.shot-tile{
  width:100%;border-radius:var(--radius);
  border:1px solid var(--border);border-bottom-width:3px;
  background:#fff;aspect-ratio:4/3;object-fit:cover;
  object-position:center;
}
@media(max-width:900px){
  .report-showcase-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:600px){
  .report-showcase-grid{grid-template-columns:1fr}
}

/* ========== 二维码与手机号 ========== */
.qr-image{
  width:120px;height:120px;border-radius:var(--radius);
  background:#fff;padding:6px;object-fit:contain;
  border-bottom:var(--edge) solid rgba(0,0,0,.2);
}
.qr-phone{
  margin-top:10px;font-size:15px;font-weight:600;
  color:#fff;letter-spacing:.5px;
}
@media(max-width:768px){
  .qr-image{width:140px;height:140px}
}