:root{
  --ivy:#2f7d4f;
  --ivy-dark:#1f5c39;
  --ivy-light:#e8f3ec;
  --gold:#c9952b;
  --gold-soft:#f6ecd6;
  --ink:#1f2933;
  --muted:#5b6770;
  --line:#e6ebe8;
  --bg:#ffffff;
  --bg-soft:#f6f9f7;
  --radius:16px;
  --maxw:1120px;
  --shadow:0 6px 24px rgba(31,92,57,.08);
  --shadow-h:0 12px 32px rgba(31,92,57,.16);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.7;font-size:16px;-webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}
.btn{
  display:inline-flex;align-items:center;gap:8px;padding:12px 22px;border-radius:999px;
  font-weight:600;font-size:15px;cursor:pointer;border:1.5px solid transparent;transition:.2s;
}
.btn-primary{background:var(--ivy);color:#fff}
.btn-primary:hover{background:var(--ivy-dark);box-shadow:var(--shadow-h)}
.btn-gold{background:var(--gold);color:#fff}
.btn-gold:hover{filter:brightness(1.05);box-shadow:var(--shadow-h)}
.btn-ghost{background:transparent;color:var(--ivy);border-color:var(--ivy)}
.btn-ghost:hover{background:var(--ivy-light)}
.btn-login{background:transparent;color:var(--ivy);border:1.5px solid var(--ivy);padding:9px 16px;font-size:14px}
.btn-login:hover{background:var(--ivy-light)}
.section{padding:72px 0}
.section-soft{background:var(--bg-soft)}
.section-title{font-size:30px;font-weight:700;color:var(--ink);text-align:center;margin-bottom:8px}
.section-sub{text-align:center;color:var(--muted);margin-bottom:40px;font-size:15px}

/* test banner */
.test-banner{
  background:var(--gold-soft);color:#7a5a16;font-size:13px;text-align:center;
  padding:8px 16px;border-bottom:1px solid #ecd9a8;
}
.test-banner b{color:#7a5a16}

/* nav */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:saturate(180%) blur(12px);
  border-bottom:1px solid var(--line)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:19px;color:var(--ivy-dark);white-space:nowrap}
.brand svg{width:30px;height:30px}
.nav-links{display:flex;align-items:center;gap:28px}
.nav-links a{font-size:15px;color:var(--muted);font-weight:500;transition:.2s;white-space:nowrap}
.nav-links a:hover{color:var(--ivy)}
.nav-cta{display:flex;align-items:center;gap:14px}
.nav-toggle{display:none;background:none;border:none;font-size:24px;color:var(--ivy-dark);cursor:pointer}

/* hero */
.hero{background:linear-gradient(160deg,#eaf5ee 0%,#f6f9f7 60%);padding:88px 0 76px}
.hero h1{font-size:46px;line-height:1.22;font-weight:800;color:var(--ivy-dark);max-width:760px}
.hero h1 .accent{color:var(--gold)}
.hero p{font-size:18px;color:var(--muted);margin:20px 0 32px;max-width:640px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.hero-tag{display:inline-block;background:#fff;border:1px solid var(--line);color:var(--ivy);
  font-size:13px;padding:6px 14px;border-radius:999px;margin-bottom:18px;font-weight:600}

/* grid + cards */
.grid{display:grid;gap:22px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;transition:.2s}
.card:hover{box-shadow:var(--shadow);transform:translateY(-3px)}
.card .ic{width:46px;height:46px;border-radius:12px;background:var(--ivy-light);color:var(--ivy);
  display:flex;align-items:center;justify-content:center;font-size:22px;margin-bottom:14px}
.card h3{font-size:18px;margin-bottom:8px;color:var(--ivy-dark)}
.card p{color:var(--muted);font-size:14.5px}

/* feature list */
.feature{display:flex;gap:14px;align-items:flex-start;margin-bottom:18px}
.feature .dot{flex:0 0 auto;width:26px;height:26px;border-radius:50%;background:var(--ivy);color:#fff;
  display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:700;margin-top:2px}
.feature h4{font-size:16px;color:var(--ink);margin-bottom:2px}
.feature p{color:var(--muted);font-size:14px}

/* placeholder hint */
.ph{outline:1px dashed #d9b25a;outline-offset:3px;border-radius:8px;background:repeating-linear-gradient(45deg,#fffdf6,#fffdf6 10px,#fbf3e0 10px,#fbf3e0 20px)}
.ph-tag{display:inline-block;font-size:11px;color:#9a7415;background:var(--gold-soft);
  padding:2px 8px;border-radius:6px;margin-bottom:6px;font-weight:600}

/* courses */
.course-card .meta{font-size:13px;color:var(--gold);font-weight:600;margin-bottom:6px}
.course-card h3{font-size:19px;color:var(--ivy-dark)}
.course-card ul{list-style:none;margin-top:12px}
.course-card li{padding:6px 0;border-top:1px dashed var(--line);color:var(--muted);font-size:14px}

/* teachers */
.teacher{text-align:center}
.avatar{width:88px;height:88px;border-radius:50%;margin:0 auto 14px;background:var(--ivy-light);
  display:flex;align-items:center;justify-content:center;color:var(--ivy);font-size:30px;font-weight:700}
.teacher h3{font-size:17px;color:var(--ivy-dark)}
.teacher .role{color:var(--gold);font-size:13px;font-weight:600;margin:2px 0 8px}
.teacher p{color:var(--muted);font-size:13.5px}

/* contact */
.contact-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:32px;align-items:start}
.info-row{display:flex;gap:12px;margin-bottom:18px}
.info-row .ic{width:40px;height:40px;border-radius:10px;background:var(--ivy-light);color:var(--ivy);
  display:flex;align-items:center;justify-content:center;font-size:18px;flex:0 0 auto}
.info-row b{display:block;color:var(--ink);font-size:15px}
.info-row span{color:var(--muted);font-size:14px}
.qr{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;text-align:center}
.qr .box{width:180px;height:180px;margin:0 auto 12px;border-radius:12px;background:var(--ivy-light);
  display:flex;align-items:center;justify-content:center;color:var(--ivy);font-size:14px;font-weight:600}
form .field{margin-bottom:14px}
form label{display:block;font-size:13px;color:var(--muted);margin-bottom:6px;font-weight:600}
form input,form select,form textarea{width:100%;padding:11px 14px;border:1px solid var(--line);
  border-radius:10px;font-size:14px;font-family:inherit;background:#fff;color:var(--ink)}
form input:focus,form select:focus,form textarea:focus{outline:none;border-color:var(--ivy);box-shadow:0 0 0 3px var(--ivy-light)}

/* footer */
.footer{background:var(--ivy-dark);color:#cfe6d8;padding:48px 0 28px}
.footer a{color:#cfe6d8}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:32px}
.footer h4{color:#fff;font-size:15px;margin-bottom:14px}
.footer p,.footer li{font-size:14px;line-height:1.9;color:#bcd6c9}
.footer ul{list-style:none}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:32px;padding-top:18px;
  text-align:center;font-size:13px;color:#9fc0b0}

/* responsive */
@media(max-width:900px){
  .grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}
  .contact-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .hero h1{font-size:34px}
  /* 平板起收成汉堡菜单：单行长条，链接不再换行 */
  .nav-links{display:none}
  .nav-links.open{display:flex;position:absolute;top:64px;left:0;right:0;background:#fff;
    flex-direction:column;gap:0;padding:8px 0;border-bottom:1px solid var(--line);box-shadow:var(--shadow)}
  .nav-links.open a{padding:12px 20px}
  .nav-toggle{display:block}
  .nav-cta{gap:8px}
  .nav-cta .btn-primary{display:none}
}
@media(max-width:640px){
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
  /* 移动端：英雄区居中、CTA 铺满，整体更紧凑有「完成感」 */
  .hero{text-align:center;padding:60px 0 52px}
  .hero h1{font-size:27px;line-height:1.32;max-width:100%}
  .hero p{font-size:16px;max-width:100%;margin:16px auto 26px}
  .hero-actions{flex-direction:column;gap:12px;align-items:stretch}
  .hero-actions .btn{justify-content:center;width:100%}
  .section{padding:56px 0}
  .section-title{font-size:25px}
  .section-sub{font-size:14px;margin-bottom:30px;padding:0 6px}
  .card{padding:22px}
  .tcard-body{padding:24px 20px}
  .tcard-body h3{font-size:24px}
  .tcard-quote{font-size:16px}
  .footer{text-align:center}
  .footer-grid > div{text-align:center}
  html,body{overflow-x:hidden}
}
@media(max-width:400px){
  .brand{font-size:17px}
  .hero h1{font-size:24px}
  .section{padding:48px 0}
}

/* ===== 名师风采（真实师资卡片 + 完整介绍灯箱） ===== */
.tgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px;max-width:1320px;margin:0 auto}
.tcard{
  display:grid;grid-template-columns:1fr;background:#fff;
  border:1px solid var(--line);border-radius:20px;overflow:hidden;
  box-shadow:var(--shadow);transition:.25s;
}
.tcard:hover{box-shadow:var(--shadow-h);transform:translateY(-4px)}
.tcard-photo{
  position:relative;display:block;width:100%;padding:0;border:none;
  cursor:zoom-in;background:#10233a;overflow:hidden;
}
/* 卡图双版本：桌面三列用横版封面（-card.jpg），中屏横版卡切竖版肖像（-portrait.jpg），
   均为 PIL 预裁，不依赖 aspect-ratio，旧内核也能原样显示 */
.tcard-photo img{width:100%;height:auto;display:block;transition:transform .4s ease}
.tcard-photo img.tcard-portrait{display:none}
.tcard-photo:hover img{transform:scale(1.04)}
.tcard-photo::after{
  content:'🔍 点击查看完整介绍';position:absolute;left:50%;bottom:14px;transform:translateX(-50%);
  background:rgba(16,35,58,.82);color:#f6ecd6;font-size:12.5px;font-weight:600;
  padding:7px 14px;border-radius:999px;white-space:nowrap;backdrop-filter:blur(4px);
  opacity:0;transition:.25s;pointer-events:none;
}
.tcard-photo:hover::after{opacity:1}
.tcard-body{padding:26px 26px 30px;display:flex;flex-direction:column}
.tcard-tags{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:14px}
.ttag{font-size:12.5px;font-weight:700;color:#33566f;background:#eef3f7;
  padding:5px 13px;border-radius:999px;letter-spacing:.5px}
.ttag-gold{color:#8a6510;background:var(--gold-soft)}
.tcard-body h3{font-size:24px;font-weight:800;color:#1b2c3d;letter-spacing:2px}
.tcard-quote{margin:14px 0 12px;font-size:17px;font-weight:700;color:#1b2c3d;line-height:1.6}
.tcard-quote em{font-style:normal;color:var(--gold);border-bottom:2px solid var(--gold-soft)}
.tcard-desc{color:var(--muted);font-size:14.5px;line-height:1.9}
.tcard-stages{
  margin:16px 0 20px;font-size:13px;font-weight:600;color:#33566f;
  background:#f2f6f9;border-left:3px solid var(--gold);padding:9px 14px;border-radius:0 10px 10px 0;
}
.tcard-more{align-self:flex-start;margin-top:auto;padding-top:6px}
.tmore-note{text-align:center;color:var(--muted);font-size:14px;margin-top:34px;letter-spacing:1px}

/* 灯箱：全屏查看完整海报 */
.lightbox{
  position:fixed;inset:0;z-index:200;display:none;align-items:center;justify-content:center;
  background:rgba(8,14,22,.92);backdrop-filter:blur(6px);padding:24px;
}
.lightbox.open{display:flex}
.lightbox-scroll{
  max-height:88vh;overflow-y:auto;border-radius:14px;position:relative;
  scrollbar-width:thin;scrollbar-color:rgba(255,255,255,.35) transparent;
}
.lightbox-scroll img{width:min(92vw,720px);height:auto;border-radius:14px;box-shadow:0 20px 60px rgba(0,0,0,.5)}
.lightbox-tip{color:rgba(255,255,255,.65);font-size:12.5px;text-align:center;padding:12px 0 4px;letter-spacing:1px}
.lightbox-close{
  position:fixed;top:18px;right:22px;z-index:210;width:44px;height:44px;border-radius:50%;
  border:none;background:rgba(255,255,255,.14);color:#fff;font-size:26px;line-height:1;
  cursor:pointer;transition:.2s;backdrop-filter:blur(4px);
}
.lightbox-close:hover{background:rgba(255,255,255,.3)}

@media(max-width:1000px){
  .tgrid{grid-template-columns:1fr;max-width:980px}
  .tcard{grid-template-columns:280px 1fr}
  /* 横版卡：切竖版肖像填满整卡高度（封面横图在窄列会被裁残） */
  .tcard-photo{height:100%}
  .tcard-photo img.tcard-cover{display:none}
  .tcard-photo img.tcard-portrait{display:block;height:100%;object-fit:cover;object-position:top}
  .tcard-body{padding:26px 26px}
  .tcard-body h3{font-size:24px}
}
@media(max-width:640px){
  .tcard{grid-template-columns:1fr}
  /* 手机竖版卡：恢复横版封面图（全宽显示效果最好），肖像图仅用于 641-1000 横版卡 */
  .tcard-photo{height:auto}
  .tcard-photo img.tcard-cover{display:block}
  .tcard-photo img.tcard-portrait{display:none}
  .tcard-body{padding:22px 20px}
  .tcard-body h3{font-size:22px}
  .tcard-quote{font-size:15.5px}
}