/* ============================================================
   元一 YUANYI · 官网全站样式
   风格参考 prowlstud.io：大字版式 / 大量留白 / 细分割线 / 悬停位移
   品牌五色：青柠 #BFE26E · 浅柠 #EFFFAD · 柔柠 #E6FAAA · 墨黑 #000 · 浅灰 #E6E6E6
   ============================================================ */

:root{
  --lime:#BFE26E;
  --lime-light:#EFFFAD;
  --lime-soft:#E6FAAA;
  --black:#000000;
  --gray:#E6E6E6;
  --paper:#FFFFFF;
  --ink-60:rgba(0,0,0,.6);
  --ink-40:rgba(0,0,0,.4);
  --line:rgba(0,0,0,.12);
  --radius:16px;
  --pad:clamp(20px,5vw,72px);
  --font:"Helvetica Neue",Helvetica,Arial,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:var(--font);
  background:var(--paper);
  color:var(--black);
  font-size:16px;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
ul{list-style:none}

::selection{background:var(--lime);color:var(--black)}

/* ---------- 排版 ---------- */
.display{
  font-size:clamp(44px,8.5vw,128px);
  font-weight:800;
  line-height:1.02;
  letter-spacing:-.03em;
}
.h-xl{font-size:clamp(34px,5.4vw,76px);font-weight:800;line-height:1.08;letter-spacing:-.02em}
.h-lg{font-size:clamp(26px,3.6vw,48px);font-weight:800;line-height:1.15;letter-spacing:-.01em}
.h-md{font-size:clamp(20px,2.4vw,28px);font-weight:700;line-height:1.3}
.eyebrow{
  font-size:12px;
  font-weight:700;
  letter-spacing:.28em;
  text-transform:uppercase;
  display:flex;
  align-items:center;
  gap:12px;
}
.eyebrow::before{content:"";width:34px;height:2px;background:var(--black)}
.eyebrow.on-lime::before{background:var(--black)}
.lead{font-size:clamp(17px,1.6vw,21px);line-height:1.85;color:var(--ink-60);max-width:46em}
/* 整句不折行：一句话一行，避免单字溢出到下一行 */
.ln{display:block;white-space:nowrap}
/* 联系页 · 微信二维码 */
.qr-box{margin-top:auto;display:flex;align-items:center;gap:14px;padding-top:16px}
.qr-box img{width:96px;height:96px;border-radius:10px;background:#fff;padding:6px;flex-shrink:0}
.qr-box span{font-size:13px;font-weight:700;line-height:1.5}
.muted{color:var(--ink-60)}
.small{font-size:13px}

/* ---------- 布局 ---------- */
.wrap{padding-left:var(--pad);padding-right:var(--pad);max-width:1640px;margin:0 auto}
.section{padding-top:clamp(72px,9vw,150px);padding-bottom:clamp(72px,9vw,150px)}
.section-head{display:flex;flex-direction:column;gap:22px;margin-bottom:clamp(36px,5vw,72px)}
.rule{border:0;border-top:1px solid var(--line)}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:clamp(24px,4vw,64px)}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(18px,2.4vw,32px)}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:clamp(18px,2.4vw,32px)}
@media(max-width:980px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr 1fr}}
@media(max-width:640px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}}

/* ---------- 顶栏 ---------- */
.site-header{
  position:fixed;inset:0 0 auto 0;z-index:90;
  display:flex;align-items:center;justify-content:space-between;
  padding:14px var(--pad);
  border-bottom:1px solid var(--line);
}
/* 毛玻璃放在伪元素上，避免 backdrop-filter 使子级 fixed 失效 */
.site-header::before{
  content:"";position:absolute;inset:0;z-index:-1;
  background:rgba(255,255,255,.82);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
}
.brand{display:flex;align-items:center;gap:12px;font-weight:800;letter-spacing:.06em}
.brand img{width:40px;height:40px;object-fit:contain}
.brand .en{font-size:11px;letter-spacing:.3em;color:var(--ink-60);display:block;line-height:1}
.brand .cn{font-size:17px;line-height:1.2;display:block}
.main-nav{display:flex;align-items:center;gap:clamp(14px,2.4vw,34px)}
.main-nav a{font-size:14px;font-weight:600;position:relative;padding:4px 0}
.main-nav a::after{
  content:"";position:absolute;left:0;bottom:-2px;height:2px;width:0;
  background:var(--black);transition:width .28s ease;
}
.main-nav a:hover::after,.main-nav a.active::after{width:100%}
.nav-cta{
  background:var(--black);color:#fff !important;
  padding:10px 22px;border-radius:999px;font-size:14px;font-weight:700;
  transition:background .25s ease,color .25s ease,transform .25s ease;
}
.nav-cta:hover{background:var(--lime);color:var(--black) !important;transform:translateY(-2px)}
.nav-cta::after{display:none}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;width:40px;height:40px;position:relative;z-index:99}
.nav-toggle span{display:block;width:24px;height:2px;background:var(--black);margin:5px auto;transition:.3s}
@media(max-width:900px){
  .nav-toggle{display:block}
  .main-nav{
    position:fixed;inset:0;background:var(--lime-light);
    flex-direction:column;justify-content:center;gap:28px;
    transform:translateY(-100%);transition:transform .4s cubic-bezier(.7,0,.3,1);
  }
  .main-nav.open{transform:translateY(0)}
  .main-nav a{font-size:26px;font-weight:800}
  body.nav-locked{overflow:hidden}
  .nav-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .nav-toggle.open span:nth-child(2){opacity:0}
  .nav-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:16px 34px;border-radius:999px;
  font-weight:700;font-size:15px;
  border:1.5px solid var(--black);
  transition:transform .25s ease,background .25s ease,color .25s ease;
  cursor:pointer;
}
.btn:hover{transform:translateY(-3px)}
.btn-solid{background:var(--black);color:#fff}
.btn-solid:hover{background:var(--lime);color:var(--black);border-color:var(--lime)}
.btn-lime{background:var(--lime);border-color:var(--lime)}
.btn-lime:hover{background:var(--black);color:#fff;border-color:var(--black)}
.btn-ghost:hover{background:var(--black);color:#fff}
.btn .arr{transition:transform .25s ease}
.btn:hover .arr{transform:translateX(5px)}

/* ---------- Hero ---------- */
.hero{
  min-height:100svh;
  display:flex;flex-direction:column;justify-content:flex-end;
  padding-top:120px;
  position:relative;
}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:26px}
.tag{
  font-size:12px;font-weight:700;letter-spacing:.14em;
  border:1px solid var(--black);border-radius:999px;padding:6px 16px;
}
.tag.fill{background:var(--lime);border-color:var(--lime)}
.hero-bottom{
  display:flex;align-items:flex-end;justify-content:space-between;
  gap:32px;margin-top:38px;padding-bottom:46px;
}
.hero-note{max-width:380px;font-size:14px;color:var(--ink-60);line-height:1.8}
@media(max-width:780px){.hero-bottom{flex-direction:column;align-items:flex-start}}
.hero-media{
  margin-top:10px;
  border-radius:var(--radius) var(--radius) 0 0;
  overflow:hidden;
}
.hero-media img,.hero-media video{width:100%;height:clamp(320px,58vh,640px);object-fit:cover;transform:scale(1.02);display:block;background:#0d0f0e}

/* ---------- 跑马灯 ---------- */
.marquee{
  background:var(--lime);
  border-top:1px solid var(--black);
  border-bottom:1px solid var(--black);
  overflow:hidden;white-space:nowrap;
  padding:14px 0;
}
.marquee-track{display:inline-flex;gap:54px;animation:scroll 30s linear infinite;will-change:transform}
.marquee span{font-size:15px;font-weight:800;letter-spacing:.12em}
@keyframes scroll{from{transform:translateX(0)}to{transform:translateX(-50%)}}

/* ---------- 数据带 ---------- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--line)}
.stat{padding:clamp(26px,3.4vw,52px) 0;border-bottom:1px solid var(--line)}
.stat+.stat{border-left:1px solid var(--line);padding-left:clamp(18px,2.6vw,44px)}
.stat .num{font-size:clamp(38px,5vw,72px);font-weight:800;letter-spacing:-.03em;line-height:1}
.stat .num em{font-style:normal;color:transparent;-webkit-text-stroke:1.5px var(--black)}
.stat .label{margin-top:12px;font-size:13px;font-weight:600;color:var(--ink-60);letter-spacing:.08em}
@media(max-width:780px){
  .stats{grid-template-columns:1fr 1fr}
  .stat:nth-child(odd){border-left:0;padding-left:0}
}

/* ---------- 列表式条目（prowl 风格项目行）---------- */
.index-list{border-top:1px solid var(--line)}
.index-row{
  display:grid;grid-template-columns:80px 1.2fr 2fr auto;
  align-items:center;gap:clamp(14px,3vw,40px);
  padding:clamp(22px,3vw,40px) 0;
  border-bottom:1px solid var(--line);
  transition:background .25s ease,padding-left .25s ease;
}
a.index-row:hover{background:var(--lime-light);padding-left:18px}
.index-row .no{font-size:13px;font-weight:700;color:var(--ink-40);letter-spacing:.1em}
.index-row .title{font-size:clamp(20px,2.6vw,34px);font-weight:800;letter-spacing:-.01em;line-height:1.2}
.index-row .desc{font-size:14px;color:var(--ink-60);line-height:1.7}
.index-row .go{
  width:46px;height:46px;border:1.5px solid var(--black);border-radius:50%;
  display:flex;align-items:center;justify-content:center;font-size:18px;
  transition:background .25s ease,color .25s ease,transform .25s ease;
}
a.index-row:hover .go{background:var(--black);color:#fff;transform:rotate(-45deg)}
@media(max-width:780px){
  .index-row{grid-template-columns:1fr;gap:8px}
  .index-row .go{display:none}
}

/* ---------- 卡片 ---------- */
.card{
  border:1px solid var(--line);border-radius:var(--radius);
  padding:clamp(24px,2.8vw,40px);
  background:#fff;
  transition:transform .3s ease,box-shadow .3s ease,background .3s ease;
  display:flex;flex-direction:column;gap:14px;
}
.card:hover{transform:translateY(-6px);box-shadow:0 24px 60px -30px rgba(0,0,0,.25)}
.card.lime{background:var(--lime)}
.card.lime-soft{background:var(--lime-soft);border-color:transparent}
.card.lime-light{background:var(--lime-light);border-color:transparent}
.card.dark{background:var(--black);color:#fff}
.card.gray{background:var(--gray);border-color:transparent}
.card .k{font-size:12px;font-weight:700;letter-spacing:.22em;text-transform:uppercase;color:inherit;opacity:.55}
.card h3{font-size:clamp(20px,2vw,26px);font-weight:800;line-height:1.25}
.card p{font-size:14.5px;line-height:1.8;color:inherit;opacity:.72}
.card .meta{margin-top:auto;font-size:13px;font-weight:700;letter-spacing:.06em}

/* ---------- 图片块 ---------- */
.media{border-radius:var(--radius);overflow:hidden;position:relative}
.media img{width:100%;height:100%;object-fit:cover;transition:transform .8s cubic-bezier(.2,.6,.2,1)}
.media:hover img{transform:scale(1.05)}
.media .cap{
  position:absolute;left:14px;bottom:14px;
  background:rgba(255,255,255,.92);border-radius:999px;
  font-size:12px;font-weight:700;letter-spacing:.08em;
  padding:7px 16px;
}

/* ---------- 画廊 ---------- */
.gallery{display:grid;grid-template-columns:repeat(12,1fr);gap:clamp(12px,1.6vw,22px)}
.gallery .media{height:clamp(200px,26vw,420px)}
.g-7{grid-column:span 7}.g-5{grid-column:span 5}
.g-4{grid-column:span 4}.g-8{grid-column:span 8}
.g-6{grid-column:span 6}.g-12{grid-column:span 12}
@media(max-width:780px){.gallery .media{grid-column:span 12;height:240px}}

/* ---------- 作品墙 ---------- */
.works-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:clamp(12px,1.4vw,20px)}
.works-grid .media{aspect-ratio:4/3}
@media(max-width:1100px){.works-grid{grid-template-columns:repeat(3,1fr)}}
@media(max-width:760px){.works-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:480px){.works-grid{grid-template-columns:1fr}}

/* 横向作品带（首页） */
.strip{display:flex;gap:18px;overflow-x:auto;padding-bottom:18px;scroll-snap-type:x mandatory}
.strip::-webkit-scrollbar{height:6px}
.strip::-webkit-scrollbar-thumb{background:var(--lime);border-radius:99px}
.strip .media{flex:0 0 clamp(240px,30vw,420px);aspect-ratio:4/3;scroll-snap-align:start}

/* ---------- 导师 ---------- */
.mentor{border-top:2px solid var(--black);padding-top:22px;display:flex;flex-direction:column;gap:10px}
.mentor .role{font-size:12px;font-weight:700;letter-spacing:.2em;color:var(--ink-60);text-transform:uppercase}
.mentor h3{font-size:24px;font-weight:800}
.mentor p{font-size:14px;color:var(--ink-60);line-height:1.8}
.mentor .awards{font-size:12.5px;font-weight:600;color:var(--black);background:var(--lime-soft);border-radius:10px;padding:10px 14px;line-height:1.7}

/* ---------- 时间轴 / 阶段 ---------- */
.stage{display:grid;grid-template-columns:120px 1fr;gap:clamp(16px,3vw,44px);padding:clamp(26px,3.4vw,46px) 0;border-bottom:1px solid var(--line)}
.stage .badge{
  width:84px;height:84px;border-radius:50%;
  background:var(--lime);display:flex;align-items:center;justify-content:center;
  font-weight:800;font-size:15px;letter-spacing:.04em;
}
.stage h3{font-size:clamp(20px,2.4vw,30px);font-weight:800;margin-bottom:8px}
.stage .dur{font-size:13px;font-weight:700;letter-spacing:.12em;color:var(--ink-60);margin-bottom:10px;text-transform:uppercase}
.stage p{color:var(--ink-60);font-size:15px;max-width:54em}
.stage .out{margin-top:12px;font-size:13.5px;font-weight:700;display:inline-block;background:var(--gray);border-radius:999px;padding:7px 16px}
@media(max-width:640px){.stage{grid-template-columns:1fr}}

/* ---------- 价格 ---------- */
.price-card{position:relative;overflow:hidden}
.price-card .price{font-size:clamp(40px,4.6vw,64px);font-weight:800;letter-spacing:-.02em;line-height:1}
.price-card .price small{font-size:15px;font-weight:600;letter-spacing:.05em}
.price-card ul{display:flex;flex-direction:column;gap:10px;margin:10px 0 18px}
.price-card li{font-size:14.5px;line-height:1.6;padding-left:24px;position:relative}
.price-card li::before{content:"+";position:absolute;left:0;font-weight:800}
.price-card.dark li::before{color:var(--lime)}

/* ---------- 表格化清单 ---------- */
.spec{width:100%;border-collapse:collapse}
.spec th,.spec td{padding:16px 14px;text-align:left;border-bottom:1px solid var(--line);font-size:14.5px;vertical-align:top}
.spec th{font-size:12px;letter-spacing:.18em;text-transform:uppercase;color:var(--ink-60)}
.spec td:first-child{font-weight:800;white-space:nowrap}

/* ---------- 公司墙 ---------- */
.wall{display:flex;flex-wrap:wrap;gap:10px}
.wall span{
  border:1px solid var(--line);border-radius:999px;
  padding:9px 20px;font-size:13.5px;font-weight:600;
  transition:background .2s ease,border-color .2s ease;
}
.wall span:hover{background:var(--lime-light);border-color:var(--black)}
.wall span.hot{background:var(--lime);border-color:var(--lime);font-weight:800}

/* ---------- 学员卡 ---------- */
.alum{border:1px solid var(--line);border-radius:var(--radius);padding:26px;display:flex;flex-direction:column;gap:8px;transition:transform .3s,background .3s}
.alum:hover{transform:translateY(-5px);background:var(--lime-light)}
.alum .init{
  width:52px;height:52px;border-radius:50%;background:var(--lime);
  display:flex;align-items:center;justify-content:center;font-weight:800;font-size:18px;margin-bottom:6px;
}
.alum h3{font-size:19px;font-weight:800}
.alum .from{font-size:12.5px;color:var(--ink-60)}
.alum .to{font-size:14px;font-weight:700;margin-top:4px}
.alum .proj{font-size:13px;color:var(--ink-60);line-height:1.7}
.alum .star{margin-top:auto;padding-top:10px;font-size:12px;font-weight:800;letter-spacing:.1em;color:var(--black)}

/* ---------- FAQ/折叠 ---------- */
details{border-bottom:1px solid var(--line)}
details summary{
  cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;
  padding:22px 0;font-size:clamp(16px,1.8vw,20px);font-weight:700;
}
details summary::after{content:"+";font-size:26px;font-weight:400;transition:transform .3s}
details[open] summary::after{transform:rotate(45deg)}
details .body{padding:0 0 24px;color:var(--ink-60);font-size:15px;max-width:60em}

/* ---------- 区块底色 ---------- */
.bg-lime{background:var(--lime)}
.bg-lime-light{background:var(--lime-light)}
.bg-lime-soft{background:var(--lime-soft)}
.bg-gray{background:#F4F4F2}
.bg-black{background:var(--black);color:#fff}
.bg-black .eyebrow::before{background:var(--lime)}
.bg-black .lead{color:rgba(255,255,255,.65)}
.bg-black .rule{border-color:rgba(255,255,255,.2)}

/* ---------- CTA ---------- */
.cta{
  text-align:left;
  padding:clamp(80px,11vw,170px) 0;
}
.cta .display em{font-style:normal;background:linear-gradient(transparent 62%,var(--lime) 62%)}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--black);color:#fff;padding-top:clamp(60px,7vw,110px)}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:clamp(24px,4vw,60px);padding-bottom:60px}
.site-footer h4{font-size:12px;letter-spacing:.24em;text-transform:uppercase;color:rgba(255,255,255,.45);margin-bottom:18px}
.site-footer a,.site-footer p{color:rgba(255,255,255,.78);font-size:14.5px;line-height:2.1;display:block}
.site-footer a:hover{color:var(--lime)}
.footer-brand p{max-width:30em}
.footer-word{
  font-size:clamp(70px,14vw,230px);font-weight:800;letter-spacing:-.02em;line-height:.95;
  color:var(--lime);padding-bottom:10px;white-space:nowrap;
}
.footer-base{
  display:flex;justify-content:space-between;gap:18px;flex-wrap:wrap;
  border-top:1px solid rgba(255,255,255,.15);
  padding:22px 0 30px;font-size:12.5px;color:rgba(255,255,255,.45);
}
@media(max-width:900px){.footer-grid{grid-template-columns:1fr 1fr}}

/* ---------- 毕业作品集索引（talents · 纯文字行 + 悬停浮图）---------- */
.talent-board{background:var(--black);color:#fff}
.talent-head{
  display:grid;grid-template-columns:70px 1.4fr 1fr auto;gap:clamp(14px,2vw,30px);
  padding:16px 0;font-size:11px;font-weight:700;letter-spacing:.24em;text-transform:uppercase;
  color:rgba(255,255,255,.4);border-bottom:1px solid rgba(255,255,255,.22);
}
.t-item{border-bottom:1px solid rgba(255,255,255,.22)}
.t-row{
  display:grid;grid-template-columns:70px 1.4fr 1fr auto;gap:clamp(14px,2vw,30px);
  align-items:center;
  padding:clamp(28px,4.4vw,60px) 0;
  color:#fff;cursor:pointer;
}
.t-row:hover .t-cn,.t-item:hover .t-cn{color:var(--lime);transform:translateX(10px)}
.t-item:hover .t-cat{color:var(--lime)}
.t-item:hover .t-arr{color:var(--lime);transform:translate(4px,-4px)}
/* 行下展开横幅图：与文字行同宽，悬停向下展开，移开收回 */
.t-band{
  display:grid;grid-template-rows:0fr;
  transition:grid-template-rows .5s cubic-bezier(.2,.6,.2,1);
}
.t-band-in{overflow:hidden;min-height:0}
.t-band img{
  width:100%;
  height:clamp(150px,16vw,230px);
  object-fit:cover;display:block;
  margin-bottom:clamp(20px,3vw,40px);
}
.t-item:hover .t-band{grid-template-rows:1fr}
.t-no{font-size:12px;font-weight:600;color:rgba(255,255,255,.4);letter-spacing:.08em}
.t-cn{
  font-size:clamp(28px,4.6vw,60px);font-weight:800;letter-spacing:-.01em;line-height:1.05;
  transition:color .2s ease,transform .3s ease;min-width:0;
}
.t-row:hover .t-cn{color:var(--lime);transform:translateX(10px)}
.t-en{font-size:13.5px;font-weight:600;color:rgba(255,255,255,.45);line-height:1.7}
.t-side{display:flex;align-items:center;gap:clamp(12px,1.8vw,24px)}
.t-cat{
  font-size:11px;font-weight:700;letter-spacing:.22em;text-transform:uppercase;
  color:rgba(255,255,255,.35);transition:color .2s ease;white-space:nowrap;
}
.t-row:hover .t-cat{color:var(--lime)}
.t-arr{
  font-size:20px;color:rgba(255,255,255,.4);
  transition:color .2s ease,transform .3s ease;
}
.t-row:hover .t-arr{color:var(--lime);transform:translate(4px,-4px)}
.t-copy{
  font:inherit;font-size:12px;font-weight:700;letter-spacing:.08em;
  border:1px solid rgba(255,255,255,.35);background:transparent;color:rgba(255,255,255,.7);
  border-radius:999px;padding:8px 16px;cursor:pointer;white-space:nowrap;
  transition:background .2s ease,color .2s ease,border-color .2s ease;
}
.t-row:hover .t-copy{border-color:var(--lime);color:var(--lime)}
.t-copy:hover,.t-copy.done{background:var(--lime);color:var(--black);border-color:var(--lime)}
@media(max-width:860px),(hover:none){
  .talent-head{display:none}
  .t-row{grid-template-columns:1fr;gap:10px}
  .t-cn{white-space:normal}
  .t-en{order:3}
  .t-side{justify-content:space-between;width:100%}
  .t-row .t-cn{color:var(--lime)} /* 触屏无 hover，名字常亮 */
  .t-band{grid-template-rows:1fr} /* 触屏无 hover，横幅常开 */
}

/* ---------- 入场动画 ---------- */
.reveal{opacity:0;transform:translateY(34px);transition:opacity .8s ease,transform .8s cubic-bezier(.2,.6,.2,1)}
.reveal.in{opacity:1;transform:none}
.reveal.d1{transition-delay:.08s}.reveal.d2{transition-delay:.16s}.reveal.d3{transition-delay:.24s}
@media(prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  .marquee-track{animation:none}
}

/* ---------- 页面顶部（内页）---------- */
.page-head{padding-top:clamp(150px,18vh,220px);padding-bottom:clamp(40px,5vw,80px)}
.page-head .crumb{font-size:12px;font-weight:700;letter-spacing:.22em;text-transform:uppercase;color:var(--ink-40);margin-bottom:22px}