/* ============ 设计 Token（源自背景插画取色） ============ */
:root{
  --orange:#FF9D2B;
  --orange-deep:#FF7A00;
  --orange-grad:linear-gradient(135deg,#FFA53D,#FF7A00);
  --peach:#FDBA8F;          /* 插画顶部暖橙 */
  --blush:#FAE4D7;          /* 插画中部浅粉 */
  --sea:#64BCEC;            /* 插画底部海浪蓝 */
  --sea-pale:#BFE7FB;       /* 远处浪 */
  --sea-soft:#D8EEFD;       /* 近处浪 / 海面区 */
  --hero-fallback:linear-gradient(170deg,#FDBA8F 0%,#FAE4D7 42%,#FCEFE6 66%,#D8EEFD 100%);
  --blue:#57AEF7;
  --blue-deep:#2E8FEF;
  --ink:#2B4A66;
  --ink-soft:#5A7A96;
  --cream:#FFF7EF;
  --card-r:24px;
  --shadow:0 8px 24px rgba(255,158,44,.14);
  --shadow-blue:0 8px 24px rgba(46,143,239,.16);
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Source Han Sans SC",sans-serif;
  color:var(--ink);background:var(--cream);line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.wrap{width:min(1180px,100% - 40px);margin-inline:auto}
.section{padding:64px 0}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:14px 30px;border-radius:999px;font-size:16px;font-weight:700;
  transition:transform .15s ease,box-shadow .15s ease;cursor:pointer;
}
.btn:active{transform:scale(.96)}
.btn-primary{
  background:var(--orange-grad);color:#fff;box-shadow:0 8px 20px rgba(255,122,0,.32);
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 26px rgba(255,122,0,.4)}
.btn-ghost{background:#fff;color:var(--orange-deep);border:2px solid #FFD9AE}
.btn-ghost:hover{border-color:var(--orange);transform:translateY(-2px)}
.btn-sm{padding:10px 20px;font-size:14px}

/* ============ 顶部导航 ============ */
.site-header{
  position:sticky;top:0;z-index:50;background:rgba(255,250,243,.82);
  backdrop-filter:blur(12px);border-bottom:1px solid rgba(255,227,194,.6);
}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-weight:900;font-size:20px;color:var(--orange-deep)}
.brand-sun{width:40px;height:40px;border-radius:50%;object-fit:cover}
.nav-links{display:none;align-items:center;gap:28px;font-weight:600;font-size:15px}
.nav-links a:hover{color:var(--orange-deep)}
.nav-cta{background:var(--orange-grad);color:#fff !important;padding:9px 22px;border-radius:999px}
.nav-toggle{display:flex;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:6px}
.nav-toggle span{width:22px;height:3px;border-radius:2px;background:var(--ink)}
.nav-open .nav-links{
  display:flex;position:absolute;top:64px;left:0;right:0;flex-direction:column;
  background:#fff;padding:18px 24px;gap:16px;box-shadow:0 16px 30px rgba(43,74,102,.12);
}

/* ============ HERO（插画全幅背景） ============ */
.hero{
  position:relative;display:flex;flex-direction:column;overflow:hidden;
  min-height:min(880px,calc(100vh - 64px));
  background:var(--hero-fallback);
}
.hero::before{
  content:"";position:absolute;inset:0;z-index:0;
  /* 焦点固定在左上角太阳IP：任何缩放/窗口比例下都不裁它；
     底部插画波浪即使被裁也由 SVG 波浪层自然衔接 */
  background:url("../assets/bg-sky.webp?v=1") left top/cover no-repeat;
}
/* 文字底下的柔和提亮，保证可读性 */
.hero::after{
  content:"";position:absolute;inset:0;z-index:0;
  background:linear-gradient(180deg,rgba(255,251,246,.30) 0%,rgba(255,251,246,.12) 46%,rgba(255,251,246,0) 72%);
}
.hero-wrap{width:min(1180px,100% - 40px);margin:auto;position:relative;z-index:1;padding:48px 0 130px}
.hero-copy{max-width:640px}
.hero-chip{
  display:inline-block;background:rgba(255,255,255,.72);color:var(--orange-deep);
  font-weight:700;font-size:13px;padding:7px 16px;border-radius:999px;margin-bottom:14px;
  backdrop-filter:blur(6px);
}
.hero h1{
  font-size:clamp(30px,7vw,52px);line-height:1.25;color:var(--ink);font-weight:900;
}
.hero h1 small{display:block;font-size:.52em;color:var(--orange-deep);margin-top:10px;font-weight:800}
.hero-sub{margin:14px 0 22px;color:var(--ink-soft);font-size:16px;max-width:30em}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.hero-badges{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-top:26px;list-style:none;max-width:430px}
.hero-badges li{
  background:rgba(255,255,255,.78);border-radius:14px;padding:10px 6px;text-align:center;
  backdrop-filter:blur(6px);
}
.hero-badges strong{display:block;color:var(--orange-deep);font-size:clamp(16px,3.4vw,22px);font-weight:900}
.hero-badges span{font-size:11px;color:var(--ink-soft)}
.hero-note{font-size:12px;color:var(--ink-soft);margin-top:10px;opacity:.8}
.hero-wave{position:absolute;bottom:0;left:0;width:100%;height:84px;z-index:1}
.section{scroll-margin-top:76px}

/* ============ 区块标题 ============ */
.sec-head{display:flex;align-items:flex-end;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:22px}
.sec-head.center{flex-direction:column;align-items:center;text-align:center}
.sec-title{font-size:clamp(24px,4.5vw,34px);font-weight:900;display:flex;align-items:center;gap:10px}
.sec-sun{width:34px;height:auto}
.sec-sub{color:var(--ink-soft);font-size:14px;margin-top:6px}
.btn-more{
  background:var(--orange-grad);color:#fff;font-size:14px;font-weight:700;
  padding:10px 22px;border-radius:999px;box-shadow:var(--shadow);
}

/* ============ 分类 Tabs ============ */
.tabs{
  display:flex;gap:10px;background:#fff;border-radius:999px;padding:8px;margin-bottom:26px;
  box-shadow:var(--shadow);overflow-x:auto;scrollbar-width:none;
}
.tabs::-webkit-scrollbar{display:none}
.tab{
  flex:0 0 auto;padding:10px 22px;border:0;border-radius:999px;background:transparent;
  font-size:15px;font-weight:700;color:var(--orange-deep);cursor:pointer;transition:.15s;
}
.tab.active{background:var(--blue);color:#fff;box-shadow:var(--shadow-blue)}

/* ============ 视频卡片 ============ */
.videos{background:linear-gradient(180deg,var(--sea-soft) 0%,#F0F9FF 52%,#FFFFFF 100%)}
.video-grid{display:grid;grid-template-columns:1fr;gap:20px}
.video-card{
  position:relative;background:#fff;border-radius:var(--card-r);overflow:hidden;
  box-shadow:var(--shadow);cursor:pointer;transition:transform .18s ease,box-shadow .18s ease;
  border:0;text-align:left;font:inherit;padding:0;display:block;width:100%;
}
.video-card:hover{transform:translateY(-5px);box-shadow:0 14px 30px rgba(255,158,44,.22)}
.vc-cover{position:relative;aspect-ratio:16/9;overflow:hidden;background:#FFE9CE}
.vc-cover img,.vc-cover svg{width:100%;height:100%;object-fit:cover}
.vc-grade{
  position:absolute;top:10px;left:10px;background:rgba(77,166,240,.94);color:#fff;
  font-size:12px;font-weight:700;padding:5px 12px;border-radius:999px;backdrop-filter:blur(4px);
}
.vc-hot{
  position:absolute;top:10px;right:10px;background:rgba(255,122,0,.95);color:#fff;
  font-size:12px;font-weight:800;padding:5px 12px;border-radius:999px;
}
.vc-play{
  position:absolute;right:12px;bottom:12px;width:42px;height:42px;border-radius:50%;
  background:var(--blue);display:flex;align-items:center;justify-content:center;
  box-shadow:var(--shadow-blue);transition:.15s;
}
.video-card:hover .vc-play{transform:scale(1.1)}
.vc-play::after{content:"";border-left:14px solid #fff;border-top:9px solid transparent;border-bottom:9px solid transparent;margin-left:3px}
.vc-body{padding:16px 18px 18px}
.vc-title{
  font-size:16px;font-weight:800;line-height:1.45;color:var(--ink);
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.vc-meta{margin-top:8px;font-size:13px;color:var(--ink-soft)}
.vc-emoji-cover{display:flex;align-items:center;justify-content:center}
.vc-emoji-cover .big{font-size:64px}

/* ============ 教学心法 ============ */
.notes{background:#fff;position:relative;overflow:hidden}
.deco-sym{position:absolute;width:86px;height:auto;opacity:.45;pointer-events:none}
.deco-sym.ds1{width:86px;right:4%;top:52px;transform:rotate(10deg)}
.deco-sym.ds2{width:72px;left:5%;bottom:44px;transform:rotate(-12deg)}
.note-cards{display:grid;grid-template-columns:1fr;gap:20px}
.note-card{
  background:var(--cream);border-radius:var(--card-r);padding:28px 26px;
  border:2px dashed #FFD9AE;position:relative;
}
.note-card::before{
  content:"❝";position:absolute;top:-16px;left:22px;font-size:40px;color:var(--orange);
  background:#fff;border-radius:50%;width:44px;height:44px;display:flex;align-items:center;justify-content:center;
  box-shadow:var(--shadow);
}
.note-card p{font-size:16px;font-weight:600;line-height:1.8}
.note-card cite{display:block;margin-top:14px;font-style:normal;font-size:13px;color:var(--ink-soft)}

/* ============ 关于顺顺 ============ */
.about-wrap{display:grid;grid-template-columns:1fr;gap:30px;align-items:center}
.about-art{position:relative;max-width:320px;margin-inline:auto;padding:6%}
.about-art::before{
  content:"";position:absolute;inset:0;border-radius:50%;
  background:radial-gradient(circle,#FFF1DC 0%,#FFF1DC 62%,rgba(255,241,220,0) 72%);
}
.about-art img{position:relative;display:block;width:100%;height:auto;filter:drop-shadow(0 14px 26px rgba(255,158,44,.2))}
.about-copy p{margin-bottom:14px;color:var(--ink-soft)}
.about-copy strong{color:var(--orange-deep)}
.promise{
  list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:18px;
  font-weight:700;font-size:14px;
}
.promise li{background:#fff;border-radius:12px;padding:10px 12px;box-shadow:var(--shadow)}

/* ============ 免费资料 ============ */
.resources{background:linear-gradient(160deg,#EAF5FF,#F7FBFF)}
.res-wrap{display:grid;grid-template-columns:1fr;gap:26px;align-items:center}
.res-copy p{color:var(--ink-soft);margin-bottom:16px}
.res-list{list-style:none;display:grid;grid-template-columns:1fr;gap:10px;font-weight:700;font-size:15px}
.res-list li{background:#fff;border-radius:12px;padding:12px 16px;box-shadow:var(--shadow-blue)}
.res-qr{text-align:center}
.res-plane{
  position:absolute;top:-34px;right:2%;width:104px;height:auto;
  transform:rotate(-9deg);pointer-events:none;
}
.res-copy{position:relative}
.qr-box{
  width:190px;margin:0 auto;background:#fff;border-radius:20px;padding:18px;
  box-shadow:var(--shadow-blue);border:2px solid #CFE8FF;
}
.qr-tip{display:block;font-size:12px;color:var(--ink-soft);margin-top:8px}
.qr-cap{margin-top:10px;font-weight:700;font-size:14px}

/* ============ 商务合作 ============ */
.business{background:#fff}
.biz-cards{display:grid;grid-template-columns:1fr;gap:20px;margin-bottom:30px}
.biz-card{
  background:var(--cream);border-radius:var(--card-r);padding:30px 26px;text-align:center;
  border:2px solid transparent;transition:.18s;
}
.biz-card:hover{border-color:#FFD9AE;transform:translateY(-4px)}
.biz-ico{display:block;height:110px;margin-bottom:14px;display:flex;align-items:flex-end;justify-content:center}
.biz-ico img{max-height:110px;width:auto;max-width:70%}
.biz-card h3{font-size:18px;font-weight:900;margin-bottom:8px}
.biz-card p{font-size:14px;color:var(--ink-soft)}
.biz-cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}

/* ============ 页脚 ============ */
.site-footer{background:var(--ink);color:#CFE0EE;margin-top:20px}
.footer-wrap{display:grid;gap:26px;padding:44px 0 30px}
.footer-brand{display:flex;align-items:center;gap:12px;color:#fff}
/* 深色页脚上给水彩太阳垫个奶油圆贴纸底，同时遮住抠图边缘 */
.footer-brand .brand-sun{background:var(--cream);border-radius:50%;padding:5px;width:44px}
.footer-brand strong{font-size:18px}
.footer-brand p{font-size:13px;color:#9DBBD4}
.footer-links{display:flex;gap:22px;flex-wrap:wrap;font-size:14px;font-weight:600}
.footer-links a:hover{color:#fff}
.footer-legal{font-size:12px;color:#9DBBD4;line-height:1.9}
.footer-legal a{text-decoration:underline}

/* ============ 移动端吸底条 ============ */
.sticky-cta{
  position:fixed;left:0;right:0;bottom:0;z-index:60;display:flex;align-items:center;gap:12px;
  background:rgba(255,255,255,.96);backdrop-filter:blur(10px);
  padding:10px 16px calc(10px + env(safe-area-inset-bottom));
  box-shadow:0 -6px 20px rgba(43,74,102,.12);transform:translateY(110%);transition:.25s;
}
.sticky-cta.show{transform:translateY(0)}
.sticky-sun{width:46px;height:auto;flex:0 0 auto}
.sticky-cta p{flex:1;line-height:1.3}
.sticky-cta strong{display:block;font-size:15px}
.sticky-cta span{font-size:12px;color:var(--ink-soft)}

/* ============ 弹窗 ============ */
.modal{position:fixed;inset:0;z-index:100;display:flex;align-items:center;justify-content:center;padding:20px}
.modal[hidden]{display:none}
.modal-mask{position:absolute;inset:0;background:rgba(20,40,60,.66);backdrop-filter:blur(3px)}
.modal-body{
  position:relative;width:min(880px,100%);background:#fff;border-radius:20px;overflow:hidden;
  box-shadow:0 30px 60px rgba(0,0,0,.35);animation:pop .22s ease;
}
@keyframes pop{from{transform:scale(.92);opacity:0}to{transform:scale(1);opacity:1}}
.modal-close{
  position:absolute;top:10px;right:10px;z-index:2;width:38px;height:38px;border-radius:50%;
  border:0;background:rgba(255,255,255,.92);color:var(--ink);font-size:22px;cursor:pointer;
  box-shadow:0 4px 12px rgba(0,0,0,.2);
}
.modal-player{aspect-ratio:16/9;background:#000}
.modal-player iframe{width:100%;height:100%;border:0}
.modal-player .mp-link{
  height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;
  color:#fff;text-align:center;padding:20px;
}
.modal-info{padding:18px 22px 22px}
.modal-info h3{font-size:17px;font-weight:800}
.modal-info p{margin-top:6px;font-size:13px;color:var(--ink-soft)}

/* =========================================================
   平板断点
========================================================= */
@media (min-width:768px){
  .section{padding:80px 0}
  .hero-wave{height:110px}
  .video-grid{grid-template-columns:repeat(2,1fr)}
  .note-cards{grid-template-columns:repeat(3,1fr)}
  .res-list{grid-template-columns:1fr 1fr}
  .biz-cards{grid-template-columns:repeat(3,1fr)}
  .footer-wrap{grid-template-columns:1fr auto;align-items:start}
  .footer-legal{grid-column:1/-1}
}

/* =========================================================
   桌面断点
========================================================= */
@media (min-width:1024px){
  .nav-links{display:flex}
  .nav-toggle{display:none}
  .hero{min-height:min(820px,calc(100vh - 64px))}
  .hero-wrap{padding:64px 0 150px}
  /* 文字栏整体居中，但左边界不小于24%，确保不遮挡左上角太阳IP */
  .hero-copy{max-width:600px;margin-left:max(24%,calc(50% - 300px));margin-right:auto}
  .video-grid{grid-template-columns:repeat(3,1fr)}
  .hero-badges{gap:12px}
  .about-wrap{grid-template-columns:.8fr 1.2fr}
  .about-art{max-width:360px}
  .res-wrap{grid-template-columns:1.3fr .7fr}
  .sticky-cta{display:none !important}
}

/* 大屏：居中基础上略微左偏（4vw），构图更均衡 */
@media (min-width:1200px){
  .hero-copy{transform:translateX(-4vw)}
}

/* 平板与手机（≤1023）：竖构图背景，太阳小、中部天空干净，文字不遮挡 */
@media (max-width:1023px){
  .hero{min-height:0}
  .hero::before{
    background-image:url("../assets/bg-sky-mobile.webp?v=2");
    background-position:center top;
  }
  .hero::after{
    background:linear-gradient(180deg,rgba(255,251,246,.42) 0%,rgba(255,251,246,.18) 52%,rgba(255,251,246,0) 78%);
  }
  .hero-wave{height:64px}
  .deco-sym,.res-plane{display:none}
}

/* 手机上给吸底条留出空间 */
@media (max-width:1023px){
  body{padding-bottom:0}
  .site-footer{padding-bottom:70px}
}