:root{
  --bg:#f6f4ef;--surface:#ffffff;--surface2:#efede7;--text:#161916;--muted:#69706b;
  --line:#dcd9d1;--accent:#1f4d3d;--accent2:#dce8e2;--danger:#8b2e2e;--warn:#8a6422;
  --shadow:0 10px 30px rgba(20,24,21,.07);--radius:20px;--radius-sm:14px;
  font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--text);background:var(--bg);
}
*{box-sizing:border-box}body{margin:0;background:var(--bg);min-height:100vh}button,input,select{font:inherit}
button{cursor:pointer}.app-shell{max-width:860px;margin:0 auto;min-height:100vh;padding:env(safe-area-inset-top) 16px calc(92px + env(safe-area-inset-bottom));}
.topbar{display:flex;align-items:center;justify-content:space-between;padding:18px 2px 12px;position:sticky;top:0;background:linear-gradient(var(--bg) 78%,transparent);z-index:5}
.brand{font-family:Georgia,"Times New Roman",serif;font-size:20px;font-weight:700}.badge{font-size:12px;color:var(--accent);background:var(--accent2);padding:6px 9px;border-radius:999px;font-weight:700}
.hero{padding:22px 4px 8px}.eyebrow{font-size:12px;text-transform:uppercase;letter-spacing:.12em;color:var(--muted);font-weight:800}.hero h1{font-family:Georgia,"Times New Roman",serif;font-size:34px;line-height:1.08;margin:8px 0}.hero p{margin:0;color:var(--muted);line-height:1.5}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px;margin:12px 0}.card.flat{box-shadow:none}.card h2,.card h3{margin:0 0 8px}.card p{color:var(--muted);line-height:1.45}
.primary-card{background:var(--accent);color:white;border:none}.primary-card p,.primary-card .muted{color:rgba(255,255,255,.78)}
.row{display:flex;gap:10px;align-items:center}.between{justify-content:space-between}.grow{flex:1}.stack{display:grid;gap:10px}.grid2{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.btn{border:1px solid var(--line);background:var(--surface);color:var(--text);border-radius:14px;padding:13px 15px;font-weight:750;min-height:48px}.btn:hover{filter:brightness(.985)}.btn.primary{background:var(--accent);color:white;border-color:var(--accent)}.btn.soft{background:var(--accent2);border-color:transparent;color:var(--accent)}.btn.ghost{background:transparent}.btn.danger{color:var(--danger)}
.metric{font-size:28px;font-weight:800;letter-spacing:-.03em}.muted{color:var(--muted)}.tiny{font-size:12px}.section-title{font-size:13px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);font-weight:800;margin:24px 3px 8px}
.list-item{width:100%;text-align:left;border:1px solid var(--line);background:var(--surface);border-radius:15px;padding:14px 15px;display:flex;justify-content:space-between;align-items:center;gap:12px}.list-item strong{display:block}.list-item .meta{font-size:12px;color:var(--muted);margin-top:3px}.chev{font-size:20px;color:var(--muted)}
.progressbar{height:8px;border-radius:999px;background:var(--surface2);overflow:hidden}.progressbar>i{display:block;height:100%;background:var(--accent);border-radius:inherit}.primary-card .progressbar{background:rgba(255,255,255,.2)}.primary-card .progressbar>i{background:#fff}
.bottom-nav{position:fixed;left:50%;transform:translateX(-50%);bottom:0;width:min(860px,100%);padding:8px 12px calc(8px + env(safe-area-inset-bottom));background:rgba(246,244,239,.94);backdrop-filter:blur(16px);border-top:1px solid var(--line);display:grid;grid-template-columns:repeat(4,1fr);z-index:20}.navbtn{border:0;background:transparent;color:var(--muted);padding:8px 2px;border-radius:12px;font-size:12px;font-weight:700}.navbtn.active{color:var(--accent);background:var(--accent2)}
.form-grid{display:grid;gap:12px}.field label{display:block;font-size:12px;font-weight:800;color:var(--muted);margin:0 0 6px}.field select,.field input{width:100%;border:1px solid var(--line);border-radius:12px;padding:12px;background:var(--surface);color:var(--text)}
.chips{display:flex;flex-wrap:wrap;gap:8px}.chip{border:1px solid var(--line);background:var(--surface);padding:9px 11px;border-radius:999px;font-size:13px;font-weight:700}.chip.active{background:var(--accent2);border-color:var(--accent2);color:var(--accent)}
.session-shell{max-width:720px;margin:0 auto}.session-head{display:flex;align-items:center;gap:12px;padding:12px 0}.session-head .progressbar{flex:1}.question-card{min-height:380px;display:flex;flex-direction:column;justify-content:space-between}.prompt-label{font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);font-weight:800}.prompt{font-family:Georgia,"Times New Roman",serif;font-size:26px;line-height:1.28;margin:18px 0;white-space:pre-wrap}.answer{border-top:1px solid var(--line);padding-top:18px;white-space:pre-wrap;font-family:Georgia,"Times New Roman",serif;font-size:19px;line-height:1.5}.answer.hidden{display:none}.choices{display:grid;gap:9px;margin-top:18px}.choice{border:1px solid var(--line);border-radius:14px;background:var(--surface);padding:13px;text-align:left;line-height:1.35}.choice.selected{border-color:var(--accent);background:var(--accent2)}.choice.wrong{border-color:var(--danger);background:#f8e9e9}.choice.correct{border-color:var(--accent);background:var(--accent2)}
.ratings{display:grid;grid-template-columns:repeat(4,1fr);gap:7px}.rate{border:1px solid var(--line);border-radius:13px;background:var(--surface);padding:11px 5px;font-size:12px;font-weight:800}.rate small{display:block;font-weight:500;color:var(--muted);margin-top:3px}.rate.r0{color:var(--danger)}.rate.r1{color:var(--warn)}.rate.r3{color:var(--accent)}
.stat-row{display:grid;grid-template-columns:1fr auto;gap:10px;align-items:center;padding:12px 0;border-bottom:1px solid var(--line)}.stat-row:last-child{border-bottom:0}.status-pill{font-size:11px;border-radius:999px;padding:5px 8px;background:var(--surface2);color:var(--muted);font-weight:800}.notice{border-left:4px solid var(--warn);padding:12px 14px;background:#f8f1df;border-radius:10px;color:#624a19;font-size:13px;line-height:1.45}
.empty{text-align:center;padding:36px 14px;color:var(--muted)}
@media(max-width:560px){.grid2{grid-template-columns:1fr}.hero h1{font-size:30px}.prompt{font-size:23px}.ratings{grid-template-columns:1fr 1fr}.question-card{min-height:430px}.card{padding:16px}}

/* Funcional 1.0 · biblioteca y formatos escritos */
.bottom-nav{grid-template-columns:repeat(5,1fr)}
.library-home-card{background:linear-gradient(135deg,#ffffff,#f2f6f3)}
.library-home-card h2{font-family:Georgia,"Times New Roman",serif;font-size:24px;margin:5px 0 4px}
.library-home-card p{margin:0;max-width:560px}.library-home-row{align-items:flex-end}
.library-controls{position:relative}.library-filter-grid{grid-template-columns:1.2fr 1fr 1fr}
.library-search{display:flex;gap:8px;margin-top:12px}.library-search input{flex:1;min-width:0;border:1px solid var(--line);border-radius:12px;padding:12px;background:var(--surface);color:var(--text)}
.library-summary{padding:6px 3px 12px;color:var(--muted);font-size:13px}.library-summary strong{color:var(--text)}
.library-group-title{font-family:Georgia,"Times New Roman",serif;font-size:21px;font-weight:700;margin:26px 2px 9px}
.library-list{display:grid;gap:8px}.library-item{background:var(--surface);border:1px solid var(--line);border-radius:15px;overflow:hidden;box-shadow:0 5px 18px rgba(20,24,21,.035)}
.library-item summary{list-style:none;cursor:pointer;padding:14px 15px;display:flex;align-items:center;justify-content:space-between;gap:12px}.library-item summary::-webkit-details-marker{display:none}.library-item[open] summary{border-bottom:1px solid var(--line)}
.library-summary-main{display:flex;align-items:center;gap:9px;min-width:0}.library-summary-main strong{line-height:1.3}.type-pill{font-size:10px;text-transform:uppercase;letter-spacing:.07em;font-weight:800;color:var(--accent);background:var(--accent2);padding:5px 7px;border-radius:999px;flex:none}
.library-body{padding:16px}.library-text{white-space:pre-wrap;font-family:Georgia,"Times New Roman",serif;font-size:17px;line-height:1.6;color:#252925}
.written-area{display:grid;gap:10px;margin-top:18px}.written-area textarea,.written-area input{width:100%;border:1px solid var(--line);border-radius:14px;background:#fff;color:var(--text);padding:14px;outline:none;line-height:1.45}.written-area textarea{resize:vertical;min-height:150px}.written-area textarea:focus,.written-area input:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(31,77,61,.08)}
.comparison-block{border:1px solid var(--line);border-radius:14px;padding:14px;margin-top:14px;background:var(--surface2)}.comparison-block.official{background:#fff}.comparison-title{font-size:11px;text-transform:uppercase;letter-spacing:.08em;font-weight:800;color:var(--muted);margin-bottom:8px}.user-answer{white-space:pre-wrap;line-height:1.5}.comparison-block .answer{border-top:0;padding-top:0;margin:0}
.text-match{font-size:12px;font-weight:700;padding:9px 11px;border-radius:10px;margin-top:10px}.text-match.match-ok{background:var(--accent2);color:var(--accent)}.text-match.match-diff{background:#f8f1df;color:#6c501c}
.choice-feedback{padding:10px 12px;border-radius:10px;margin-bottom:9px;font-size:13px;font-weight:750}.choice-feedback.ok{background:var(--accent2);color:var(--accent)}.choice-feedback.bad{background:#f8e9e9;color:var(--danger)}
.session-formats{margin-top:18px;padding-top:16px;border-top:1px solid var(--line)}.session-formats>strong{display:block;margin-bottom:9px}
@media(max-width:700px){.library-filter-grid{grid-template-columns:1fr}.library-home-row{display:grid;align-items:start}.library-home-row .btn{width:100%;margin-top:8px}}
@media(max-width:560px){.bottom-nav{padding-left:5px;padding-right:5px}.navbtn{font-size:10.5px}.library-search{display:grid;grid-template-columns:1fr auto}.library-search input{grid-column:1/-1}.library-text{font-size:16px}.library-summary-main{align-items:flex-start;flex-direction:column;gap:6px}}