:root{
  --bg:#FFFDF8;
  --ink:#17324D;
  --ink-soft:#4C5F70;
  --red:#C22A2E;
  --red-dark:#98191D;
  --gold:#EFA93A;
  --green:#2f6e4f;
  --line:#E7E1D3;
  --card:#FFFFFF;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{margin:0;background:var(--bg);color:var(--ink);font-family:'Inter',sans-serif;font-size:17px;line-height:1.65;-webkit-font-smoothing:antialiased;}
h1,h2,h3{font-family:'Fraunces',serif;font-weight:600;line-height:1.1;margin:0;color:var(--ink);}
a{color:inherit;}
.wrap{max-width:820px;margin:0 auto;padding:0 28px;}

/* Nav */
nav{border-bottom:1px solid var(--line);}
.nav-inner{max-width:820px;margin:0 auto;padding:20px 28px;display:flex;align-items:center;justify-content:space-between;}
.wordmark{font-family:'Fraunces';font-weight:700;font-size:20px;}
.wordmark .dot{color:var(--red);}
.nav-links{display:flex;gap:24px;font-size:15px;font-weight:500;color:var(--ink-soft);}
.nav-links a:hover{color:var(--ink);}

/* Progress rail */
.progress-rail{position:sticky;top:0;z-index:50;background:var(--ink);color:#fff;border-bottom:3px solid var(--red);}
.progress-inner{max-width:820px;margin:0 auto;padding:12px 28px;display:flex;align-items:center;gap:18px;}
.brand{font-family:'Fraunces';font-weight:700;font-size:15px;white-space:nowrap;}
.brand span{color:var(--gold);}
.steps{display:flex;gap:5px;flex:1;}
.step-dot{flex:1;height:6px;border-radius:3px;background:rgba(255,255,255,.18);position:relative;overflow:hidden;}
.step-dot.done{background:var(--gold);}
.step-dot.active{background:rgba(255,255,255,.35);}
.step-dot.active::after{content:"";position:absolute;inset:0;background:var(--red);animation:fillstep 1.6s ease forwards;}
@keyframes fillstep{from{width:0;}to{width:100%;}}
.step-label{font-size:12px;opacity:.85;white-space:nowrap;}

/* Hero */
.hero{padding:52px 0 40px;border-bottom:1px solid var(--line);}
.nav-units{display:flex;justify-content:space-between;font-size:14px;margin-bottom:20px;color:var(--ink-soft);}
.nav-units a{color:var(--red-dark);font-weight:700;text-decoration:none;}
.kicker{display:inline-flex;align-items:center;gap:8px;font-size:13.5px;font-weight:700;color:var(--red-dark);background:#FCEAE9;padding:5px 12px;border-radius:100px;margin-bottom:18px;}
.level-tag{display:inline-block;font-size:12.5px;font-weight:700;color:var(--ink-soft);border:1px solid var(--line);padding:4px 10px;border-radius:100px;margin-left:8px;}
.hero h1{font-size:clamp(30px,5vw,44px);}
.hero .en-title{font-family:'Fraunces';font-style:italic;font-weight:400;font-size:18px;color:var(--ink-soft);margin-top:6px;}
.hero .sub{color:var(--ink-soft);font-size:17px;margin-top:8px;}
.hero p.lead{color:var(--ink-soft);font-size:17.5px;max-width:56ch;margin-top:16px;}
.cta-row{display:flex;gap:14px;margin-top:26px;flex-wrap:wrap;align-items:center;}
.hint{font-size:14px;color:var(--ink-soft);}

/* Buttons */
.btn{font-family:'Inter';font-weight:600;font-size:15.5px;background:var(--red);color:#fff;border:none;padding:14px 28px;border-radius:8px;cursor:pointer;text-decoration:none;display:inline-block;}
.btn:hover{background:var(--red-dark);}
.btn.secondary{background:transparent;color:var(--ink);border:1.5px solid var(--ink);}
.btn.secondary:hover{background:var(--ink);color:#fff;}
.btn.small{padding:9px 18px;font-size:13.5px;}

/* Steps */
section.step{padding:48px 0;border-bottom:1px solid var(--line);}
section.step.last{border-bottom:none;}
.step-head{display:flex;align-items:baseline;gap:14px;margin-bottom:8px;}
.step-num{font-family:'Fraunces';color:var(--red);font-size:14px;font-weight:700;}
.step-head h2{font-size:clamp(24px,3.6vw,30px);}
.step .wrap > p{color:var(--ink-soft);max-width:58ch;margin:10px 0 26px;font-size:16px;}

/* Diary / read text / gloss */
.diary{background:var(--card);border:1px solid var(--line);border-left:5px solid var(--red);border-radius:4px 12px 12px 4px;box-shadow:0 10px 24px -16px rgba(23,50,77,.3);padding:30px 32px;}
.diary + .diary{margin-top:18px;}
.diary-label{font-family:'Fraunces';font-style:italic;font-size:14.5px;color:var(--red-dark);margin-bottom:14px;}
.diary p{font-size:16.5px;max-width:64ch;margin:0 0 15px;}
.gap{display:block;height:15px;}
.gloss{border-bottom:2px dotted var(--red);cursor:pointer;position:relative;}
.gloss:hover{background:#FCEAE9;}
.gloss-tooltip{position:absolute;bottom:calc(100% + 8px);left:50%;transform:translateX(-50%);background:var(--ink);color:#fff;padding:7px 12px;border-radius:6px;font-size:13.5px;font-family:'Inter';font-weight:600;white-space:nowrap;z-index:20;box-shadow:0 6px 16px -6px rgba(0,0,0,.4);}
.gloss-tooltip::after{content:"";position:absolute;top:100%;left:50%;transform:translateX(-50%);border:6px solid transparent;border-top-color:var(--ink);}
.gloss-hint{font-size:13.5px;color:var(--ink-soft);margin-bottom:16px;display:flex;align-items:center;gap:8px;}
.gloss-hint .dot-sample{border-bottom:2px dotted var(--red);padding-bottom:1px;}

/* Vocab flip cards */
.vocab-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:16px;}
.flip-card{perspective:1000px;height:140px;cursor:pointer;}
.flip-inner{position:relative;width:100%;height:100%;transition:transform .5s cubic-bezier(.2,.7,.3,1);transform-style:preserve-3d;}
.flip-card.flipped .flip-inner{transform:rotateY(180deg);}
.flip-face{position:absolute;inset:0;backface-visibility:hidden;border-radius:10px;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:14px;text-align:center;}
.flip-front{background:var(--ink);color:#fff;}
.flip-front .es{font-family:'Fraunces';font-size:16px;}
.flip-front .tap{font-size:11px;opacity:.6;margin-top:8px;}
.flip-back{background:var(--gold);color:var(--ink);transform:rotateY(180deg);}
.flip-back .de{font-weight:700;font-size:13.5px;}
.flip-back .ex{font-size:12px;margin-top:6px;opacity:.85;font-style:italic;}

/* Grammar */
.grammar-box{white-space:pre-line;font-size:15.5px;color:var(--ink);}
.grammar-box b{color:var(--red-dark);}
.gram-note{margin-bottom:16px;}
.gram-note h3{font-size:17px;margin-bottom:8px;}
.gram-note p{color:var(--ink-soft);font-size:15px;margin:0 0 8px;}
.gram-example{font-style:italic;font-size:15px;color:var(--ink);}
.gram-arrow{color:var(--red-dark);font-weight:600;}

/* Exercises */
.ex-item{margin-bottom:26px;padding-bottom:22px;border-bottom:1px dashed var(--line);}
.ex-item:last-child{border-bottom:none;margin-bottom:0;}
.ex-item h3{font-size:16.5px;margin-bottom:8px;color:var(--red-dark);}
.ex-item .exbody{white-space:pre-line;color:var(--ink);font-size:15.5px;margin-bottom:12px;}
.ex-item .exq{font-weight:700;font-size:16.5px;margin-bottom:10px;}
.ex-item input[type=text]{border:2px solid var(--line);border-radius:6px;padding:9px 12px;font-size:16px;font-family:'Inter';width:100%;max-width:320px;}
.ex-item textarea{border:2px solid var(--line);border-radius:8px;padding:12px;font-size:15.5px;font-family:'Inter';width:100%;min-height:70px;resize:vertical;}
.ex-item input.ok{border-color:var(--green);background:#EAF5EE;}
.ex-item input.bad{border-color:var(--red);background:#FCEBEA;}
.ex-feedback{margin-top:8px;font-size:14.5px;font-weight:600;}
.tf-btns{display:flex;gap:10px;margin-top:6px;}
.tf-btn{padding:9px 18px;border-radius:6px;border:2px solid var(--line);background:#fff;cursor:pointer;font-weight:700;font-family:'Inter';font-size:14px;}
.tf-btn.right{border-color:var(--green);background:#EAF5EE;}
.tf-btn.wrong{border-color:var(--red);background:#FCEBEA;}
.justify-box{margin-top:12px;padding:12px 16px;background:#FBF7EE;border-radius:8px;font-size:14.5px;color:var(--ink-soft);display:none;}
.reveal-link{font-size:14px;color:var(--red-dark);font-weight:600;cursor:pointer;text-decoration:underline;background:none;border:none;padding:0;font-family:'Inter';}
.model-answer{margin-top:10px;padding:12px 16px;background:#FBF7EE;border-radius:8px;font-size:14.5px;color:var(--ink-soft);display:none;font-style:italic;}

/* Culture / tips */
.culture-box{background:#FBF2DD;border-radius:12px;padding:26px 30px;border:1px solid #F0DFAF;}
.culture-box .diary-label{color:var(--red-dark);}
.tips-box{background:#FBF2DD;border-radius:12px;padding:26px 30px;border:1px solid #F0DFAF;}
.tips-box ul{margin:0;padding-left:20px;}
.tips-box li{margin-bottom:6px;color:var(--ink-soft);}

/* Audio / dialog */
.player{padding:8px 0 26px;}
.player audio{width:100%;}
.dlg-line{margin-bottom:10px;}
.dlg-speaker{font-weight:700;color:var(--red-dark);}

/* Completion */
.completion{text-align:center;padding:64px 0 84px;}
.completion h2{font-size:clamp(28px,4.6vw,38px);}
.completion p{color:var(--ink-soft);max-width:46ch;margin:14px auto 28px;}

/* Footer */
footer{text-align:center;padding:30px 24px 50px;color:var(--ink-soft);font-size:13px;}