/* ============================================
   LU LAOSHI WRITING · 呂老師升學作文
   品牌系統：參照 lu-laoshi-brand Skill
   ============================================ */

:root{
  --bg:#F5F2EC;
  --bg-alt:#EDEAE3;
  --ink:#0F0F0F;
  --ink-soft:#5A5A58;
  --ink-dim:#9B978F;
  --red:#E63329;
  --line:#D4D0C6;
  --dark:#111111;
  --ivory:#F5F2EC;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:'Noto Sans TC','Space Grotesk',sans-serif;
  font-weight:400;
  color:var(--ink);
  background:var(--bg);
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
  letter-spacing:.01em;
  overflow-x:hidden;
}
.en{font-family:'Space Grotesk',sans-serif;letter-spacing:.08em}
.hand{font-family:'Caveat',cursive;letter-spacing:0}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}

.container{max-width:1440px;margin:0 auto;padding:0 48px}
section{padding:160px 0}

/* ========== 頂部 NAV ========== */
nav{
  position:sticky;top:0;z-index:50;
  padding:18px 48px;display:flex;justify-content:space-between;align-items:center;
  background:var(--bg-alt);border-bottom:1px solid var(--line);
  font-size:13px;letter-spacing:.1em;
}
nav .logo{font-weight:700;font-family:'Space Grotesk',sans-serif}
nav .logo::before{content:"●";color:var(--ink);margin-right:8px;font-size:10px}
nav ul{display:flex;gap:32px;list-style:none}
nav a:hover{color:var(--red)}
nav a.yt-link{color:var(--red)}
nav a.soon-link::after{content:" · soon";color:var(--red);font-size:9px;letter-spacing:.2em;font-family:'Space Grotesk',sans-serif}

/* ========== 區塊標籤 ========== */
.block-label{
  font-family:'Space Grotesk',sans-serif;
  font-size:13px;font-weight:500;letter-spacing:.2em;
  color:var(--red);margin-bottom:40px;display:flex;align-items:center;gap:12px;
}
.block-label::before{content:"//";font-weight:400}

/* ========== HERO ========== */
.hero{padding:96px 0 64px;background:var(--bg)}
.hero-top{display:grid;grid-template-columns:1.5fr .7fr;gap:56px;align-items:flex-end;margin-bottom:32px}
.hero-kicker{font-size:12px;letter-spacing:.3em;color:var(--red);margin-bottom:20px;font-weight:500}
.hero h1{font-weight:900;font-size:clamp(28px,4.8vw,62px);line-height:1.18;letter-spacing:-.015em}
.hero h1 .red{color:var(--red)}
.hero-note{font-size:13px;line-height:1.9;color:var(--ink-soft);padding-bottom:4px;border-left:1px solid var(--line);padding-left:20px;max-width:320px}
.hero-note-label{display:block;color:var(--red);font-size:11px;letter-spacing:.25em;margin-bottom:8px;font-weight:500}

.hero-svg-wrap{width:100%;max-width:1200px;margin:0 auto}
.hero-svg{width:100%;height:auto;display:block;max-height:440px}

.hero-ctas{
  margin-top:40px;padding-top:28px;border-top:1px solid var(--line);
  display:flex;justify-content:space-between;align-items:center;gap:24px;flex-wrap:wrap;
}
.hero-ctas-left{display:flex;gap:14px;flex-wrap:wrap;align-items:center}
.hero-cta-prefix{font-size:13px;color:var(--ink-soft);letter-spacing:.05em;margin-right:4px;font-style:italic}
.hero-replay{padding:10px 18px;background:transparent;border:1px solid var(--line);font-size:11px;letter-spacing:.2em;color:var(--ink-soft);cursor:pointer;transition:all .3s}
.hero-replay:hover{border-color:var(--red);color:var(--red)}

/* ---------- Hero SVG Animation ---------- */
.cliff{fill:none;stroke:var(--ink);stroke-width:1.8;stroke-linecap:square;stroke-dasharray:900;stroke-dashoffset:900;animation:drawLine .7s ease forwards}
@keyframes drawLine{to{stroke-dashoffset:0}}
.fig{opacity:0;animation:fadeIn .4s ease forwards}
@keyframes fadeIn{to{opacity:1}}
.fig-c{fill:none;stroke:var(--ink);stroke-width:1.8}
.fig-b{stroke:var(--ink);stroke-width:1.8;stroke-linecap:round}
.chasm-ln{stroke:var(--ink);stroke-width:.8;opacity:0;animation:slashIn .4s ease forwards}
@keyframes slashIn{to{opacity:.22}}
.lbl{font-family:'Noto Sans TC',sans-serif;font-weight:700;font-size:22px;fill:var(--ink);text-anchor:middle;opacity:0;letter-spacing:.05em;animation:upIn .5s ease forwards}
.lbl-sub{font-family:'Space Grotesk',sans-serif;font-weight:400;font-size:12px;fill:var(--ink-soft);text-anchor:middle;opacity:0;letter-spacing:.2em;animation:upIn .5s ease forwards;text-transform:uppercase}
.lbl-red{fill:var(--red)}
@keyframes upIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.step-ln{stroke:var(--red);stroke-width:2.2;fill:none;stroke-linecap:round;stroke-dasharray:200;stroke-dashoffset:200;animation:drawLine .45s ease forwards}
.step-lbl{font-family:'Noto Sans TC',sans-serif;font-weight:900;font-size:16px;fill:var(--red);text-anchor:middle;opacity:0;letter-spacing:.1em;animation:upIn .4s ease forwards}
.deck{stroke:var(--red);stroke-width:2.2;fill:none;stroke-dasharray:700;stroke-dashoffset:700;animation:drawLine 1s ease 4s forwards}

/* ========== INTRO ========== */
.intro{background:var(--dark);color:var(--ivory);padding:200px 0}
.intro .block-label{color:var(--red)}
.intro-quote{font-family:'Noto Sans TC',sans-serif;font-weight:900;font-size:clamp(32px,5.4vw,78px);line-height:1.25;letter-spacing:-.01em;max-width:1100px}
.intro-quote .redline{color:var(--red)}
.intro-sub{margin-top:48px;max-width:640px;color:rgba(245,242,236,.65);font-size:16px;line-height:2;font-weight:300}
.intro-cta{margin-top:56px}

/* ========== ABOUT ========== */
.about-grid{display:grid;grid-template-columns:1.3fr .8fr;gap:80px;align-items:start}
.about-title{font-weight:900;font-size:clamp(28px,4vw,56px);line-height:1.25;letter-spacing:-.01em;margin-bottom:32px}
.about-title .hand-accent{font-family:'Caveat',cursive;color:var(--red);font-weight:600;font-size:1.1em}
.about-body{font-size:15px;line-height:2;color:var(--ink-soft);font-weight:400;max-width:520px}
.about-body p{margin-bottom:20px}
.stats{display:grid;gap:32px;padding-top:12px}
.stat-item{padding:24px 0;border-top:1px solid var(--line);display:grid;grid-template-columns:auto 1fr;gap:24px;align-items:baseline}
.stat-item:last-child{border-bottom:1px solid var(--line)}
.stat-num{font-family:'Space Grotesk',sans-serif;font-weight:500;font-size:clamp(40px,5vw,68px);line-height:1;letter-spacing:-.02em;color:var(--ink)}
.stat-num .plus{color:var(--red);font-weight:400}
.stat-desc{font-size:13px;letter-spacing:.1em;color:var(--ink-soft);line-height:1.7}
.stat-desc strong{display:block;color:var(--ink);font-weight:500;margin-bottom:4px;font-size:14px;letter-spacing:.05em}

/* ========== METHOD ========== */
.method{background:var(--bg-alt)}
.method-head{display:flex;justify-content:space-between;align-items:flex-end;flex-wrap:wrap;gap:32px;margin-bottom:100px}
.method-head h2{font-weight:900;font-size:clamp(32px,5vw,64px);line-height:1.2;letter-spacing:-.01em;max-width:760px}
.method-head .note{font-size:14px;color:var(--ink-soft);max-width:320px;line-height:2}
.method-list{border-top:1px solid var(--line)}
.method-row{display:grid;grid-template-columns:180px 260px 1fr auto;gap:40px;padding:48px 0;border-bottom:1px solid var(--line);align-items:center}
.method-row .num{font-family:'Space Grotesk',sans-serif;font-weight:300;font-size:clamp(56px,7vw,110px);line-height:.9;letter-spacing:-.03em;-webkit-text-stroke:1px var(--ink);color:transparent}
.method-row h3{font-weight:900;font-size:clamp(24px,3vw,36px);line-height:1.2}
.method-row .desc{font-size:15px;color:var(--ink-soft);line-height:2;max-width:480px}
.method-row .arrow{width:48px;height:48px;border:1px solid var(--ink);border-radius:50%;display:flex;align-items:center;justify-content:center;transition:all .3s;font-family:'Space Grotesk',sans-serif}
.method-row:hover .num{color:var(--red);-webkit-text-stroke-color:var(--red)}
.method-row:hover .arrow{background:var(--red);border-color:var(--red);color:#fff}

/* ========== LADDER ========== */
.ladder{background:var(--bg)}
.ladder-head{margin-bottom:80px;max-width:880px}
.ladder-head h2{font-weight:900;font-size:clamp(32px,5vw,60px);line-height:1.25;letter-spacing:-.01em;margin-bottom:24px}
.ladder-head h2 .red{color:var(--red)}
.ladder-head .note{font-size:15px;color:var(--ink-soft);line-height:2;max-width:680px}
.ladder-list{display:grid;grid-template-columns:1fr;gap:0;border-top:1px solid var(--line)}
.ladder-row{display:grid;grid-template-columns:120px 180px 1fr;gap:32px;padding:36px 0;border-bottom:1px solid var(--line);align-items:center}
.ladder-row .score{font-family:'Space Grotesk',sans-serif;font-weight:500;font-size:clamp(36px,4.5vw,56px);line-height:1;letter-spacing:-.02em}
.ladder-row .leap{font-family:'Space Grotesk',sans-serif;font-size:12px;letter-spacing:.2em;color:var(--red);text-transform:uppercase}
.ladder-row .desc{font-size:15px;color:var(--ink-soft);line-height:2;max-width:520px}
.ladder-row.highlight{background:rgba(230,51,41,.04)}
.ladder-row.highlight .score{color:var(--red)}
.ladder-row.highlight .desc{color:var(--ink);font-weight:500}

/* ========== EXPLORE（首頁 4 入口卡，v7 新增） ========== */
.explore{background:var(--bg-alt);padding:160px 0}
.explore-head{margin-bottom:72px;max-width:880px}
.explore-head h2{font-weight:900;font-size:clamp(32px,5vw,56px);line-height:1.25;letter-spacing:-.01em}
.explore-head h2 .red{color:var(--red)}
.explore-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:0;border-top:1px solid var(--line)}
.explore-card{
  display:grid;grid-template-columns:60px 1fr auto;gap:24px;align-items:start;
  padding:44px 0;border-bottom:1px solid var(--line);
  color:inherit;transition:background .3s,transform .3s;
}
.explore-card:nth-child(odd){border-right:1px solid var(--line);padding-right:48px}
.explore-card:nth-child(even){padding-left:48px}
.explore-card:hover{background:rgba(230,51,41,.03)}
.explore-card .card-num{font-family:'Space Grotesk',sans-serif;font-weight:300;font-size:42px;color:var(--red);line-height:1}
.explore-card h3{font-weight:900;font-size:clamp(22px,2.6vw,28px);line-height:1.3;margin-bottom:12px}
.explore-card p{font-size:14px;color:var(--ink-soft);line-height:1.9;max-width:360px}
.explore-card .card-arrow{font-family:'Space Grotesk',sans-serif;font-size:24px;color:var(--ink);transition:color .3s,transform .3s;padding-top:6px}
.explore-card:hover .card-arrow{color:var(--red);transform:translateX(6px)}

/* ========== CLASSES ========== */
.classes-head{display:flex;justify-content:space-between;align-items:flex-end;margin-bottom:64px;flex-wrap:wrap;gap:24px}
.classes-head h2{font-weight:900;font-size:clamp(32px,5vw,64px);line-height:1.2}
.class-list{border-top:1px solid var(--line)}
.class-row{display:grid;grid-template-columns:60px 2fr 1fr auto;gap:32px;padding:36px 0;border-bottom:1px solid var(--line);align-items:center;transition:background .3s}
.class-row:hover{background:rgba(230,51,41,.03)}
.class-row .idx{font-family:'Space Grotesk',sans-serif;font-weight:400;font-size:14px;letter-spacing:.15em;color:var(--ink-dim)}
.class-row h3{font-weight:700;font-size:clamp(20px,2.5vw,28px);line-height:1.3;margin-bottom:4px}
.class-row .age{font-family:'Space Grotesk',sans-serif;font-size:12px;letter-spacing:.2em;color:var(--ink-soft);text-transform:uppercase}
.class-row .desc{font-size:14px;color:var(--ink-soft);line-height:1.9;max-width:380px}
.class-row .arrow{width:44px;height:44px;border:1px solid var(--ink);border-radius:50%;display:flex;align-items:center;justify-content:center;transition:all .3s}
.class-row:hover .arrow{background:var(--red);border-color:var(--red);color:#fff}

/* ========== AI 線上批改 COMING SOON ========== */
.ai-soon{background:var(--bg-alt);padding:180px 0}
.ai-soon-grid{display:grid;grid-template-columns:1.4fr .8fr;gap:80px;align-items:start}
.soon-tag{font-family:'Space Grotesk',sans-serif;font-size:11px;letter-spacing:.25em;color:var(--red);text-transform:uppercase;margin-bottom:24px;padding:6px 14px;background:rgba(230,51,41,.08);display:inline-block}
.ai-soon h2{font-weight:900;font-size:clamp(32px,5vw,60px);line-height:1.2;letter-spacing:-.01em;margin-bottom:32px}
.ai-soon h2 .red{color:var(--red)}
.ai-soon-desc{font-size:16px;line-height:2;color:var(--ink-soft);max-width:560px;margin-bottom:48px}
.ai-soon-flow{display:flex;flex-direction:column;border-top:1px solid var(--line);margin-bottom:32px}
.flow-step{display:grid;grid-template-columns:60px 1fr;gap:24px;align-items:start;padding:24px 0;border-bottom:1px solid var(--line)}
.flow-step .step-num{font-family:'Space Grotesk',sans-serif;font-weight:300;font-size:36px;color:var(--red);line-height:1}
.flow-step .step-body strong{display:block;font-weight:700;font-size:17px;margin-bottom:6px}
.flow-step .step-body span{font-size:13px;color:var(--ink-soft)}
.ai-soon-side{display:flex;flex-direction:column;gap:32px}
.price-card{background:var(--dark);color:var(--ivory);padding:40px}
.price-label{font-family:'Space Grotesk',sans-serif;font-size:11px;letter-spacing:.25em;color:var(--red);margin-bottom:16px;text-transform:uppercase}
.price-num{font-family:'Space Grotesk',sans-serif;font-weight:500;font-size:52px;line-height:1;letter-spacing:-.02em;margin-bottom:8px}
.price-num .plus{color:var(--red);font-size:.55em;font-weight:400;margin-left:4px}
.price-desc{font-size:13px;color:rgba(245,242,236,.6);letter-spacing:.15em;text-transform:uppercase;font-family:'Space Grotesk',sans-serif;margin-bottom:24px}
.price-meta{font-size:13px;line-height:2;color:rgba(245,242,236,.7);padding-top:20px;border-top:1px solid rgba(245,242,236,.2)}
.soon-fit{padding:32px;border:1px solid var(--line);background:var(--bg)}
.soon-fit h4{font-family:'Space Grotesk',sans-serif;font-size:11px;letter-spacing:.25em;color:var(--red);margin-bottom:16px;text-transform:uppercase;font-weight:500}
.soon-fit ul{list-style:none;display:flex;flex-direction:column;gap:12px}
.soon-fit li{font-size:14px;line-height:1.7;color:var(--ink-soft);padding-left:18px;position:relative}
.soon-fit li::before{content:"—";position:absolute;left:0;color:var(--red)}

/* ========== WORK / 學生範文 ========== */
.work{background:var(--dark);color:var(--ivory);padding:200px 0}
.work .block-label{color:var(--red)}
.work h2{font-weight:900;font-size:clamp(32px,5vw,68px);line-height:1.2;margin-bottom:96px;max-width:1000px}
.work h2 .red{color:var(--red)}
.work-row{display:grid;grid-template-columns:80px 1fr 1.2fr;gap:48px;padding:64px 0;border-top:1px solid rgba(245,242,236,.15);align-items:start}
.work-row:last-child{border-bottom:1px solid rgba(245,242,236,.15)}
.work-row .idx{font-family:'Space Grotesk',sans-serif;font-weight:300;font-size:42px;color:var(--red);line-height:1;letter-spacing:-.02em}
.work-row .tag{font-family:'Space Grotesk',sans-serif;font-size:12px;letter-spacing:.2em;color:rgba(245,242,236,.5);margin-bottom:16px;text-transform:uppercase}
.work-row h3{font-weight:900;font-size:clamp(26px,3.4vw,42px);line-height:1.2;margin-bottom:24px}
.work-row .note{font-size:14px;color:rgba(245,242,236,.55);line-height:2;max-width:380px;border-left:2px solid var(--red);padding-left:16px;margin-bottom:20px}
.work-row .note strong{color:var(--red);font-weight:500;display:block;margin-bottom:8px;font-size:12px;letter-spacing:.2em;text-transform:uppercase}
.work-row .quote{font-family:'Noto Sans TC',sans-serif;font-weight:300;font-size:16px;line-height:2.1;color:rgba(245,242,236,.88)}
.work-row .yt-link{display:inline-flex;align-items:center;gap:8px;font-size:12px;letter-spacing:.2em;color:var(--red);font-family:'Space Grotesk',sans-serif;text-transform:uppercase;margin-top:16px;border-bottom:1px solid var(--red);padding-bottom:4px;transition:opacity .3s}
.work-row .yt-link:hover{opacity:.7}

/* ========== TEACHER WORK / 老師範文 ========== */
.teacher-work{background:var(--bg-alt);padding:180px 0}
.teacher-work-head{margin-bottom:80px;max-width:880px}
.teacher-work-head h2{font-weight:900;font-size:clamp(32px,5vw,60px);line-height:1.25;letter-spacing:-.01em;margin-bottom:24px}
.teacher-work-head h2 .red{color:var(--red)}
.teacher-work-head .note{font-size:15px;color:var(--ink-soft);line-height:2;max-width:680px}
.teacher-work-list{display:grid;grid-template-columns:1fr 1fr;gap:48px}
.teacher-work-card{background:var(--bg);padding:48px;border:1px solid var(--line);display:flex;flex-direction:column;gap:24px;transition:all .3s}
.teacher-work-card:hover{border-color:var(--red)}
.teacher-work-card .tag{font-family:'Space Grotesk',sans-serif;font-size:11px;letter-spacing:.25em;color:var(--red);text-transform:uppercase}
.teacher-work-card h3{font-weight:900;font-size:clamp(24px,2.8vw,32px);line-height:1.3}
.teacher-work-card .excerpt{font-family:'Noto Sans TC',sans-serif;font-weight:300;font-size:15px;line-height:2;color:var(--ink-soft);border-left:2px solid var(--red);padding-left:18px}
.teacher-work-card .ellipsis{color:var(--ink-dim);font-style:italic;display:block;margin:12px 0}
.teacher-work-card .meta{display:flex;justify-content:space-between;align-items:center;margin-top:auto;padding-top:16px;border-top:1px solid var(--line)}
.teacher-work-card .meta .author{font-size:13px;color:var(--ink);font-weight:500}
.teacher-work-card .meta .yt-link{display:inline-flex;align-items:center;gap:8px;font-size:11px;letter-spacing:.2em;color:var(--red);font-family:'Space Grotesk',sans-serif;text-transform:uppercase}

/* ========== YOUTUBE BANNER ========== */
.yt-banner{background:var(--dark);color:var(--ivory);padding:120px 0;text-align:center}
.yt-banner h2{font-weight:900;font-size:clamp(28px,4.5vw,52px);line-height:1.25;letter-spacing:-.01em;margin-bottom:24px}
.yt-banner h2 .red{color:var(--red)}
.yt-banner p{font-size:15px;color:rgba(245,242,236,.65);line-height:2;max-width:560px;margin:0 auto 40px}
.yt-banner .btn-yt{display:inline-flex;align-items:center;gap:14px;padding:20px 36px;background:var(--red);color:#fff;font-size:14px;letter-spacing:.15em;font-weight:500;font-family:'Noto Sans TC',sans-serif;transition:all .3s}
.yt-banner .btn-yt:hover{background:#fff;color:var(--red)}
.yt-banner .btn-yt::before{content:"▶";font-size:12px}

/* ========== BOARD / 留言板 ========== */
.board{background:var(--bg);padding:180px 0}
.board-head{margin-bottom:64px;max-width:880px}
.board-head h2{font-weight:900;font-size:clamp(32px,5vw,60px);line-height:1.2;letter-spacing:-.01em;margin-bottom:24px}
.board-head h2 .red{color:var(--red)}
.board-note{font-size:15px;color:var(--ink-soft);line-height:2}
.board-form{max-width:680px;display:grid;gap:28px}
.form-row{display:flex;flex-direction:column;gap:10px}
.form-row label{font-size:13px;color:var(--ink);font-weight:500;letter-spacing:.05em}
.form-row select,.form-row textarea,.form-row input[type=text]{
  width:100%;padding:14px 16px;border:1px solid var(--line);
  background:var(--bg);font-family:inherit;font-size:14px;color:var(--ink);
  outline:none;transition:border-color .3s;border-radius:0;
}
.form-row select:focus,.form-row textarea:focus,.form-row input[type=text]:focus{border-color:var(--red)}
.form-row textarea{resize:vertical;line-height:1.7;min-height:100px}
.board-form button{align-self:flex-start;margin-top:8px}
.form-note{font-size:13px;color:var(--ink-soft);line-height:1.8}
.form-note a{color:var(--red);border-bottom:1px solid var(--red)}

/* ========== TAOLU / 14 套路 ========== */
.taolu{background:var(--bg);padding:180px 0}
.taolu-head{margin-bottom:64px;max-width:880px}
.taolu-head h2{font-weight:900;font-size:clamp(32px,5vw,60px);line-height:1.2;letter-spacing:-.01em;margin-bottom:24px}
.taolu-head h2 .red{color:var(--red)}
.taolu-head .desc{font-size:15px;color:var(--ink-soft);line-height:2;max-width:680px}
.taolu-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:0 32px;border-top:1px solid var(--line)}
.taolu-item{padding:20px 0;border-bottom:1px solid var(--line);display:grid;grid-template-columns:48px 1fr;gap:16px;align-items:center;font-size:15px}
.taolu-item .num{font-family:'Space Grotesk',sans-serif;color:var(--red);font-weight:300;font-size:24px;text-align:center}
.taolu-note{margin-top:48px;padding:32px;background:var(--bg-alt);border-left:3px solid var(--red);max-width:780px;font-size:14px;color:var(--ink-soft);line-height:2}

/* ========== CTA ========== */
.cta{padding:200px 0;text-align:left}
.cta h2{font-weight:900;font-size:clamp(40px,8vw,140px);line-height:.95;letter-spacing:-.03em}
.cta h2 .hand-accent{font-family:'Caveat',cursive;color:var(--red);font-weight:600;letter-spacing:0}
.cta-row{margin-top:64px;display:flex;justify-content:space-between;align-items:flex-end;gap:48px;flex-wrap:wrap;padding-top:40px;border-top:1px solid var(--line)}
.cta-desc{max-width:520px;font-size:15px;line-height:2;color:var(--ink-soft)}
.cta-box{display:flex;align-items:center;gap:32px;flex-wrap:wrap}

/* QR 桌機 vs 按鈕手機 */
.qr-mini{width:160px;height:160px;border:1px solid var(--ink);background:#fff;display:flex;align-items:center;justify-content:center;padding:10px}
.qr-mini img{width:100%;height:auto;display:block}
.qr-caption{font-size:11px;color:var(--ink-soft);letter-spacing:.2em;margin-top:8px;text-align:center;font-family:'Space Grotesk',sans-serif;text-transform:uppercase}
.cta-line-btn{display:none}

/* ========== BUTTONS ========== */
.btn{display:inline-flex;align-items:center;gap:12px;padding:18px 32px;font-size:14px;font-weight:500;letter-spacing:.15em;cursor:pointer;transition:all .3s;border:1px solid transparent;font-family:'Noto Sans TC',sans-serif}
.btn.primary{background:var(--ink);color:var(--ivory)}
.btn.primary:hover{background:var(--red);color:#fff}
.btn.ghost{background:transparent;color:var(--ink);border-color:var(--ink)}
.btn.ghost:hover{background:var(--ink);color:var(--ivory)}
.intro .btn.primary{background:var(--red);color:#fff}
.intro .btn.primary:hover{background:var(--ivory);color:var(--ink)}
.intro .btn.ghost{color:var(--ivory);border-color:var(--ivory)}
.btn .arrow{font-family:'Space Grotesk',sans-serif;font-weight:300;font-size:18px;letter-spacing:0}

/* ========== FLOATING LINE ========== */
.floating-line{position:fixed;bottom:28px;right:28px;z-index:60;background:var(--ink);color:var(--ivory);padding:16px 26px;border-radius:0;font-size:13px;letter-spacing:.15em;box-shadow:0 6px 24px rgba(0,0,0,.18);display:flex;align-items:center;gap:10px;transition:all .3s}
.floating-line:hover{background:var(--red)}
.floating-line::before{content:"＋";color:var(--red);font-weight:700}
.floating-line:hover::before{color:#fff}

/* ========== FOOTER ========== */
footer{background:var(--dark);color:rgba(245,242,236,.5);padding:80px 0 32px}
.foot-top{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;padding-bottom:60px;border-bottom:1px solid rgba(245,242,236,.12)}
footer h4{color:var(--ivory);font-family:'Space Grotesk',sans-serif;font-size:12px;letter-spacing:.25em;margin-bottom:20px;font-weight:500}
footer h4::before{content:"// ";color:var(--red)}
footer ul{list-style:none}
footer li{padding:6px 0;font-size:14px}
footer a:hover{color:var(--red)}
footer p{font-size:14px;line-height:2}
footer .foot-bot{padding-top:32px;display:flex;justify-content:space-between;font-family:'Space Grotesk',sans-serif;font-size:12px;letter-spacing:.15em;flex-wrap:wrap;gap:16px}

/* ========== SUBPAGE HEADER ========== */
.page-hero{padding:96px 0 64px;background:var(--bg);border-bottom:1px solid var(--line)}
.page-hero .kicker{font-family:'Space Grotesk',sans-serif;font-size:12px;letter-spacing:.3em;color:var(--red);margin-bottom:20px;font-weight:500;text-transform:uppercase}
.page-hero h1{font-weight:900;font-size:clamp(32px,5.2vw,68px);line-height:1.2;letter-spacing:-.015em;max-width:1080px}
.page-hero h1 .red{color:var(--red)}
.page-hero .lead{margin-top:32px;font-size:16px;color:var(--ink-soft);line-height:2;max-width:680px}
.page-hero .back{display:inline-flex;align-items:center;gap:8px;margin-bottom:32px;font-family:'Space Grotesk',sans-serif;font-size:12px;letter-spacing:.2em;color:var(--ink-soft);text-transform:uppercase;transition:color .3s}
.page-hero .back:hover{color:var(--red)}

/* ========== RWD ========== */
@media (max-width:1024px){
  .container{padding:0 32px}
  nav{padding:16px 32px}
  nav ul{gap:20px;font-size:11px}
  section{padding:120px 0}
  .about-grid,.ai-soon-grid{grid-template-columns:1fr;gap:56px}
  .method-row{grid-template-columns:100px 1fr auto;gap:24px}
  .method-row .desc{grid-column:1 / -1;max-width:100%;margin-top:-16px}
  .ladder-row{grid-template-columns:80px 140px 1fr;gap:20px}
  .class-row{grid-template-columns:50px 1fr auto;gap:20px}
  .class-row .desc{grid-column:1 / -1;margin-top:-8px;padding-left:70px;max-width:100%}
  .work-row{grid-template-columns:60px 1fr;gap:32px}
  .work-row .quote{grid-column:1 / -1;padding-left:108px}
  .teacher-work-list{grid-template-columns:1fr}
  .foot-top{grid-template-columns:1fr 1fr}
  .hero{padding:64px 0 48px}
  .hero-top{grid-template-columns:1fr;gap:28px;align-items:flex-start}
  .hero-note{max-width:100%;padding-left:16px}
  .explore-grid{grid-template-columns:1fr}
  .explore-card:nth-child(odd){border-right:none;padding-right:0}
  .explore-card:nth-child(even){padding-left:0}
}
@media (max-width:640px){
  .container{padding:0 20px}
  nav{padding:14px 20px;font-size:11px}
  nav ul{gap:14px;flex-wrap:wrap}
  section{padding:80px 0}
  .intro,.work,.teacher-work,.yt-banner,.ai-soon,.board,.taolu,.explore{padding:120px 0}
  .hero{padding:40px 0 32px}
  .hero-top{gap:20px;margin-bottom:24px}
  .hero-svg{max-height:280px}
  .hero-ctas{flex-direction:column;align-items:stretch}
  .hero-ctas-left{flex-direction:column;align-items:flex-start}
  .hero-ctas-left .btn{width:100%;justify-content:center}
  .hero-cta-prefix{margin-bottom:8px}
  .hero-replay{align-self:flex-end}
  .block-label{font-size:11px;margin-bottom:28px}
  .method-head,.classes-head,.ladder-head,.teacher-work-head,.board-head,.explore-head{flex-direction:column;align-items:flex-start}
  .method-row{grid-template-columns:1fr;gap:16px;padding:36px 0}
  .method-row .num{font-size:80px}
  .method-row .arrow{justify-self:flex-end}
  .ladder-row{grid-template-columns:1fr;gap:8px;padding:28px 0}
  .ladder-row .score{font-size:36px}
  .class-row{grid-template-columns:1fr auto;gap:12px}
  .class-row .idx{grid-column:1 / -1;font-size:12px}
  .class-row .age{grid-column:1;margin-top:-4px}
  .class-row .desc{grid-column:1 / -1;padding-left:0;margin-top:4px;max-width:100%}
  .class-row .arrow{grid-row:1 / 3;grid-column:2;align-self:start;margin-top:6px}
  .work-row{grid-template-columns:1fr;gap:24px;padding:48px 0}
  .work-row .idx{font-size:36px}
  .work-row .quote{padding-left:0}
  .teacher-work-card{padding:32px}
  .price-card,.soon-fit{padding:28px}
  .cta-row{flex-direction:column;align-items:flex-start}
  .foot-top{grid-template-columns:1fr;gap:32px}
  .foot-bot{flex-direction:column;gap:12px}
  .floating-line{bottom:16px;right:16px;padding:12px 20px}
  .qr-mini,.qr-caption{display:none}
  .cta-line-btn{display:inline-flex}
  .taolu-grid{grid-template-columns:1fr}
  .explore-card{grid-template-columns:48px 1fr;padding:32px 0}
  .explore-card .card-arrow{grid-column:2;margin-top:-16px}
}