/* ===== LS Dev Dojo — tokens ===== */
:root{
  --paper:#F1EEE6;
  --paper-raised:#FFFFFF;
  --paper-sunken:#E8E3D6;
  --sumi:#23201B;
  --sumi-soft:#5B564C;
  --line:#DDD6C4;
  --indigo:#2C3E63;
  --indigo-deep:#1B2740;
  --indigo-tint:#E3E7EF;
  --hanko:#B23A2E;
  --hanko-tint:#F6E3E0;
  --bamboo:#6E7F4F;
  --bamboo-tint:#E8ECDD;
  --gold:#A6772E;
  --gold-tint:#F1E5CF;
  --shadow:0 1px 2px rgba(35,32,27,.06), 0 6px 20px -8px rgba(35,32,27,.18);
  --radius:14px;
  --radius-sm:9px;
  --font-display:"Outfit", "Zen Kaku Gothic New", "Hiragino Sans", sans-serif;
  --font-body:"Zen Kaku Gothic New", "Hiragino Sans", "Yu Gothic", sans-serif;
  --font-mono:"JetBrains Mono", "SF Mono", monospace;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --paper:#17181B;
    --paper-raised:#1F2023;
    --paper-sunken:#131417;
    --sumi:#ECE7DA;
    --sumi-soft:#A9A296;
    --line:#37342E;
    --indigo:#8CA0CE;
    --indigo-deep:#B7C3E2;
    --indigo-tint:#25304A;
    --hanko:#E2685C;
    --hanko-tint:#3A2422;
    --bamboo:#A3B784;
    --bamboo-tint:#26301F;
    --gold:#D1A25C;
    --gold-tint:#332816;
    --shadow:0 1px 2px rgba(0,0,0,.4), 0 8px 24px -8px rgba(0,0,0,.5);
  }
}
:root[data-theme="dark"]{
  --paper:#17181B;
  --paper-raised:#1F2023;
  --paper-sunken:#131417;
  --sumi:#ECE7DA;
  --sumi-soft:#A9A296;
  --line:#37342E;
  --indigo:#8CA0CE;
  --indigo-deep:#B7C3E2;
  --indigo-tint:#25304A;
  --hanko:#E2685C;
  --hanko-tint:#3A2422;
  --bamboo:#A3B784;
  --bamboo-tint:#26301F;
  --gold:#D1A25C;
  --gold-tint:#332816;
  --shadow:0 1px 2px rgba(0,0,0,.4), 0 8px 24px -8px rgba(0,0,0,.5);
}

*{box-sizing:border-box;}
html,body{margin:0;padding:0;}
body{
  background:var(--paper);
  color:var(--sumi);
  font-family:var(--font-body);
  font-size:15px;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,.font-display{font-family:var(--font-display);font-weight:800;text-wrap:balance;letter-spacing:-0.01em;}
.accent{color:var(--hanko);}
.mono{font-family:var(--font-mono);}
a{color:var(--indigo);text-decoration:none;}
button{font-family:var(--font-body);}
[hidden]{display:none!important;}
img{max-width:100%;}

::selection{background:var(--gold-tint);}
:focus-visible{outline:2px solid var(--indigo);outline-offset:2px;border-radius:4px;}

/* ===== layout shells ===== */
#app{min-height:100vh;}
.view{min-height:100vh;}

.loading-screen{
  min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;
  color:var(--sumi-soft);
}
.stamp-spin{
  width:44px;height:44px;border-radius:50%;
  border:3px solid var(--line);border-top-color:var(--hanko);
  animation:spin 1s linear infinite;
}
@media (prefers-reduced-motion:reduce){ .stamp-spin{animation-duration:2.4s;} }
@keyframes spin{to{transform:rotate(360deg);}}

/* ===== login ===== */
.login-wrap{
  min-height:100vh;display:flex;align-items:center;justify-content:center;
  padding:32px 20px;background:
    radial-gradient(600px 400px at 85% -10%, var(--indigo-tint), transparent 60%),
    var(--paper);
}
.login-card{
  width:100%;max-width:400px;background:var(--paper-raised);border:1px solid var(--line);
  border-radius:var(--radius);box-shadow:var(--shadow);padding:36px 32px 30px;position:relative;overflow:hidden;
}
.login-stamp{
  position:absolute;top:-18px;right:-18px;width:96px;height:96px;border-radius:50%;
  border:3px solid var(--hanko);color:var(--hanko);display:flex;align-items:center;justify-content:center;
  font-family:var(--font-display);font-size:34px;font-weight:700;opacity:.16;transform:rotate(8deg);
}
.login-title{font-size:32px;margin:0 0 4px;color:var(--sumi);}
.login-sub{font-size:12.5px;color:var(--sumi-soft);margin:0 0 28px;letter-spacing:.02em;}
.field{margin-bottom:16px;}
.field label{display:block;font-size:12.5px;font-weight:700;color:var(--sumi-soft);margin-bottom:6px;letter-spacing:.03em;}
.field input,.field select,.field textarea{
  width:100%;border:1px solid var(--line);background:var(--paper);color:var(--sumi);
  border-radius:var(--radius-sm);padding:10px 12px;font-size:14.5px;font-family:var(--font-body);
}
.field textarea{font-family:var(--font-body);resize:vertical;min-height:84px;}
.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--indigo);}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  border:1px solid transparent;border-radius:var(--radius-sm);padding:10px 18px;
  font-size:14px;font-weight:700;cursor:pointer;letter-spacing:.02em;transition:filter .15s;
}
.btn:hover{filter:brightness(1.06);}
.btn:active{filter:brightness(.94);}
.btn-primary{background:var(--indigo);color:#fff;width:100%;}
.btn-secondary{background:var(--paper-sunken);color:var(--sumi);border-color:var(--line);}
.btn-ghost{background:transparent;color:var(--indigo);border-color:var(--line);}
.btn-danger{background:transparent;color:var(--hanko);border-color:var(--hanko-tint);}
.btn-sm{padding:6px 12px;font-size:12.5px;}
.next-mirror-btn{padding:12px 24px;font-size:25px;}
.btn:disabled{opacity:.5;cursor:not-allowed;}
.error-text{color:var(--hanko);font-size:13px;font-weight:700;margin:10px 0 0;min-height:1em;}
.hint-text{color:var(--sumi-soft);font-size:12px;margin-top:18px;line-height:1.6;}

/* ===== app shell ===== */
.topbar{
  position:fixed;top:0;left:0;right:0;height:58px;z-index:40;
  background:var(--paper-raised);border-bottom:1px solid var(--line);
  display:flex;align-items:center;justify-content:space-between;padding:0 18px;
}
.brand{font-family:var(--font-display);font-size:19px;font-weight:700;color:var(--sumi);
  background:none;border:none;cursor:pointer;display:flex;align-items:center;gap:8px;padding:6px 4px;}
.brand .brand-sub{font-family:var(--font-body);font-size:10.5px;font-weight:700;color:var(--hanko);
  background:var(--hanko-tint);border-radius:99px;padding:2px 8px;letter-spacing:.03em;}
.topbar-right{display:flex;align-items:center;gap:10px;}
.userchip{display:flex;align-items:center;gap:8px;background:var(--paper-sunken);border-radius:99px;padding:5px 12px 5px 5px;
  border:1px solid var(--line);cursor:pointer;font-size:13px;color:var(--sumi);position:relative;}
.userchip .avatar{width:26px;height:26px;border-radius:50%;background:var(--indigo);color:#fff;font-size:12px;font-weight:700;
  display:flex;align-items:center;justify-content:center;font-family:var(--font-mono);}
.usermenu{position:absolute;top:44px;right:0;background:var(--paper-raised);border:1px solid var(--line);
  border-radius:var(--radius-sm);box-shadow:var(--shadow);min-width:190px;padding:6px;z-index:50;}
.usermenu button{display:flex;width:100%;text-align:left;background:none;border:none;padding:9px 10px;font-size:13.5px;
  color:var(--sumi);border-radius:8px;cursor:pointer;}
.usermenu button:hover{background:var(--paper-sunken);}
.usermenu .role-tag{color:var(--sumi-soft);font-size:11px;padding:6px 10px 4px;font-family:var(--font-mono);}

.shell-body{display:flex;padding-top:58px;min-height:100vh;}
.sidebar{
  width:210px;flex:none;position:fixed;top:58px;bottom:0;left:0;background:var(--paper-raised);
  border-right:1px solid var(--line);padding:18px 12px;display:flex;flex-direction:column;gap:4px;
}
.sidebar-section-label{font-size:11px;color:var(--sumi-soft);font-weight:700;letter-spacing:.05em;padding:8px 10px 4px;}
.navlink{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:var(--radius-sm);color:var(--sumi);
  font-size:14px;font-weight:600;cursor:pointer;border:none;background:none;text-align:left;width:100%;}
.navlink:hover{background:var(--paper-sunken);}
.navlink.active{background:var(--indigo-tint);color:var(--indigo-deep);}
.navlink .navicon{width:18px;text-align:center;flex:none;font-family:var(--font-mono);}
.content{flex:1;padding:28px 32px 90px;min-width:0;margin-left:210px;max-width:1600px;}

.bottomnav{display:none;}

@media (max-width:900px){
  .sidebar{display:none;}
  .content{margin-left:0;padding:20px 16px 84px;}
  .bottomnav{
    display:flex;position:fixed;bottom:0;left:0;right:0;height:64px;background:var(--paper-raised);
    border-top:1px solid var(--line);z-index:40;
  }
  .bottomnav button{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;
    background:none;border:none;color:var(--sumi-soft);font-size:11px;font-weight:600;cursor:pointer;}
  .bottomnav button .navicon{font-family:var(--font-mono);font-size:15px;}
  .bottomnav button.active{color:var(--indigo);}
}

.pc-only{display:inline;}
.mobile-only{display:none;}
@media (max-width:900px){ .pc-only{display:none;} .mobile-only{display:inline;} }

/* ===== page header / search ===== */
.page-head{margin-bottom:22px;}
.page-title{font-size:28px;margin:0 0 6px;}
.page-lead{color:var(--sumi-soft);font-size:13.5px;margin:0;}
.searchbar{position:relative;margin:16px 0 28px;max-width:480px;}
.searchbar input{
  width:100%;padding:11px 14px 11px 38px;border-radius:99px;border:1px solid var(--line);
  background:var(--paper-raised);color:var(--sumi);font-size:14px;
}
.searchbar input:focus{border-color:var(--indigo);}
.searchbar .sicon{position:absolute;left:13px;top:50%;transform:translateY(-50%);color:var(--sumi-soft);font-size:14px;}

.dash-hero{margin-bottom:8px;}
.dash-hero h1{font-size:36px;margin:0 0 8px;}
.dash-hero p{color:var(--sumi-soft);font-size:13.5px;margin:0 0 18px;}

/* ===== continue card (home) ===== */
.continue-card{background:var(--paper-raised);border:1px solid var(--line);border-radius:var(--radius);
  padding:22px 24px;margin-bottom:24px;box-shadow:var(--shadow);max-width:460px;}
.continue-card-label{font-size:12px;font-weight:700;color:var(--indigo);letter-spacing:.03em;margin-bottom:8px;}
.continue-card-title{font-family:var(--font-display);font-weight:800;font-size:19px;color:var(--sumi);margin-bottom:14px;}
.continue-progress-track{margin-top:0;}
.continue-progress-label{font-size:12.5px;color:var(--sumi-soft);margin:8px 0 14px;font-family:var(--font-mono);}
.continue-last-label{font-size:12.5px;color:var(--sumi-soft);margin-bottom:14px;line-height:1.6;}
.continue-card--intro{max-width:420px;}
.continue-card--intro .continue-card-label{color:var(--hanko);}
.continue-intro-text{color:var(--sumi-soft);font-size:13.5px;line-height:1.7;margin:0 0 16px;}

/* ===== tiles ===== */
.tile-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:14px;}
.tile{
  background:var(--paper-raised);border:1px solid var(--line);border-radius:var(--radius);
  padding:20px 14px 16px;display:flex;flex-direction:column;align-items:center;gap:10px;text-align:center;
  cursor:pointer;box-shadow:var(--shadow);transition:transform .12s,border-color .12s;position:relative;
}
.tile:hover{transform:translateY(-2px);border-color:var(--indigo);}
.tile-name{font-size:13.5px;font-weight:700;color:var(--sumi);}
.tile-icon{width:52px;height:52px;border-radius:16px;display:flex;align-items:center;justify-content:center;
  font-family:var(--font-mono);font-weight:700;font-size:15px;color:#fff;}
.tile-icon--indigo{background:var(--indigo);}
.tile-icon--hanko{background:var(--hanko);}
.tile-icon--bamboo{background:var(--bamboo);}
.tile-icon--gold{background:var(--gold);}
.tile-icon--emoji{background:var(--paper-sunken);font-size:24px;}
.tile-icon--asset{background:var(--paper-sunken);overflow:hidden;padding:0;}
.tile-icon--asset img{width:100%;height:100%;object-fit:cover;}
.tile-icon-sm{width:34px;height:34px;border-radius:10px;font-size:11px;}
.tile.is-guide{border-color:var(--hanko);}
.tile.is-selected-major{border-color:var(--bamboo);background:var(--bamboo-tint);box-shadow:0 0 0 2px var(--bamboo);}
.tile-badge{position:absolute;top:8px;right:8px;background:var(--hanko);color:#fff;font-size:10px;font-weight:700;
  padding:2px 7px;border-radius:99px;letter-spacing:.02em;}

/* ===== material cards ===== */
.material-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px;}
.material-card{
  background:var(--paper-raised);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  box-shadow:var(--shadow);display:flex;flex-direction:column;cursor:pointer;transition:border-color .12s;
}
.material-card:hover{border-color:var(--indigo);}
.material-card--done{opacity:.55;filter:grayscale(.4);}
.material-card--done:hover{opacity:.85;}
.done-badge{display:inline-block;font-size:10px;font-weight:700;color:var(--bamboo);background:var(--bamboo-tint);
  border-radius:99px;padding:2px 8px;margin-left:6px;vertical-align:middle;}
.material-thumb{aspect-ratio:16/10;background:var(--paper-sunken);display:flex;align-items:center;justify-content:center;
  color:var(--sumi-soft);font-size:12px;overflow:hidden;}
.material-thumb img{width:100%;height:100%;object-fit:cover;}
.material-body{padding:14px 14px 12px;display:flex;flex-direction:column;gap:6px;flex:1;}
.material-title{font-weight:700;font-size:14.5px;}
.material-desc{color:var(--sumi-soft);font-size:12.5px;line-height:1.6;flex:1;}
.material-foot{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-top:6px;}
.material-src{font-size:11.5px;color:var(--indigo);}
.fav-btn{border:1px solid var(--line);background:var(--paper-raised);border-radius:99px;padding:6px 12px;
  font-size:12px;font-weight:700;cursor:pointer;color:var(--sumi-soft);white-space:nowrap;flex:none;}
.fav-btn.is-fav{background:var(--hanko-tint);border-color:var(--hanko);color:var(--hanko);}
.material-thumb--sm{aspect-ratio:auto;height:52px;font-size:24px;}
.material-desc--clamp{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.progress-track{height:6px;border-radius:99px;background:var(--paper-sunken);overflow:hidden;margin-top:8px;}
.progress-fill{height:100%;border-radius:99px;background:var(--bamboo);transition:width .2s;}
.progress-label{font-size:11px;color:var(--sumi-soft);margin-top:5px;font-family:var(--font-mono);}
.progress-mgmt-empty{color:var(--sumi-soft);font-size:13.5px;margin:0;padding:4px 0;}
.progress-mgmt-summary-name{font-family:var(--font-display);font-weight:800;font-size:16px;color:var(--sumi);margin-bottom:4px;}
.progress-mgmt-stats{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px;}
.progress-mgmt-stat{flex:1 1 110px;background:var(--paper-sunken);border-radius:var(--radius-sm);padding:10px 12px;text-align:center;}
.progress-mgmt-stat-num{display:block;font-family:var(--font-mono);font-weight:700;font-size:18px;color:var(--sumi);}
.progress-mgmt-stat-label{display:block;font-size:11px;color:var(--sumi-soft);margin-top:2px;}

.empty-state{
  border:1px dashed var(--line);border-radius:var(--radius);padding:40px 24px;text-align:center;
  color:var(--sumi-soft);font-size:13.5px;background:var(--paper-raised);
}

/* ===== category header ===== */
.cat-head{display:flex;align-items:center;gap:14px;margin-bottom:22px;}
.cat-head .tile-icon{width:56px;height:56px;font-size:16px;}
.cat-head h1{margin:0;font-size:24px;}
.back-link{display:inline-flex;align-items:center;gap:4px;font-size:12.5px;color:var(--sumi-soft);
  cursor:pointer;background:none;border:none;padding:0;margin-bottom:14px;}
.back-link:hover{color:var(--indigo);}

/* ===== guide page ===== */
.guide-hero{background:var(--indigo-tint);border-radius:var(--radius);padding:30px 28px;margin-bottom:26px;}
.guide-hero h1{margin:0 0 8px;font-size:30px;color:var(--indigo-deep);}
.guide-hero h1 .accent{color:var(--hanko);}
.guide-hero p{margin:0;color:var(--sumi-soft);font-size:13.5px;}
.guide-section{margin-bottom:24px;padding-bottom:22px;border-bottom:1px solid var(--line);}
.guide-section:last-child{border-bottom:none;}
.guide-section h2{font-size:17px;margin:0 0 10px;display:flex;align-items:center;gap:8px;}
.guide-section h2::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--hanko);flex:none;}
.guide-section p{margin:0;color:var(--sumi-soft);font-size:14px;line-height:1.85;white-space:pre-wrap;}

/* ===== knowledge list ===== */
#kn-groups{max-width:760px;}
.kn-summary{display:flex;align-items:baseline;gap:8px;margin-bottom:20px;background:var(--paper-raised);
  border:1px solid var(--line);border-radius:var(--radius);padding:16px 20px;width:fit-content;}
.kn-summary .num{font-family:var(--font-mono);font-size:26px;font-weight:700;color:var(--indigo);}
.kn-summary .lbl{font-size:12.5px;color:var(--sumi-soft);}
.kn-group{border:1px solid var(--line);border-radius:var(--radius);margin-bottom:12px;background:var(--paper-raised);overflow:hidden;}
.kn-group-head{display:flex;align-items:center;gap:12px;padding:14px 16px;cursor:pointer;}
.kn-group-head .tile-icon{width:38px;height:38px;font-size:12px;border-radius:11px;}
.kn-group-head .gname{font-weight:700;font-size:14.5px;flex:1;}
.kn-group-head .gcount{font-family:var(--font-mono);font-size:12px;color:var(--sumi-soft);}
.kn-group-head .chev{color:var(--sumi-soft);transition:transform .15s;}
.kn-group.open .chev{transform:rotate(90deg);}
.kn-group-body{border-top:1px solid var(--line);padding:8px 16px 4px;}
.kn-group-body[hidden]{display:none;}
.kn-item{display:flex;align-items:center;gap:12px;padding:10px 0;border-bottom:1px solid var(--line);}
.kn-item:last-child{border-bottom:none;}
.kn-item .kn-thumb{width:56px;height:38px;border-radius:6px;background:var(--paper-sunken);flex:none;overflow:hidden;}
.kn-item .kn-thumb img{width:100%;height:100%;object-fit:cover;}
.kn-item .kn-thumb--lesson{display:flex;align-items:center;justify-content:center;background:var(--indigo-tint);
  color:var(--indigo-deep);font-size:10.5px;font-weight:700;}
.kn-item .kn-title{flex:1;font-size:13.5px;font-weight:600;}
.kn-item .kn-actions{display:flex;gap:6px;}

/* ===== modal ===== */
.modal-overlay{position:fixed;inset:0;background:rgba(23,20,17,.55);z-index:100;display:flex;
  align-items:center;justify-content:center;padding:24px;}
.modal-box{background:var(--paper-raised);border-radius:var(--radius);max-width:640px;width:100%;
  max-height:88vh;overflow:auto;box-shadow:var(--shadow);border:1px solid var(--line);}
.modal-head{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid var(--line);}
.modal-head h3{margin:0;font-size:16px;}
.modal-close{background:none;border:none;font-size:20px;cursor:pointer;color:var(--sumi-soft);line-height:1;}
.modal-body{padding:20px;}
.modal-img{width:100%;border-radius:var(--radius-sm);border:1px solid var(--line);margin-bottom:14px;}
.modal-foot{display:flex;justify-content:flex-end;gap:8px;padding:14px 20px;border-top:1px solid var(--line);}
.answer-compare{display:grid;grid-template-columns:1fr 1fr;gap:16px;}
@media (max-width:640px){ .answer-compare{grid-template-columns:1fr;} }
.answer-col-label{font-weight:700;font-size:12.5px;color:var(--sumi-soft);margin-bottom:8px;letter-spacing:.02em;}
.answer-code{background:var(--paper-sunken);border:1px solid var(--line);border-radius:8px;padding:12px;
  font-family:var(--font-mono);font-size:13px;line-height:1.7;white-space:pre-wrap;word-break:break-word;color:var(--sumi);margin:0;}
.answer-empty{color:var(--sumi-soft);font-style:italic;}
.answer-code .err{color:var(--hanko);background:var(--hanko-tint);border-radius:2px;font-weight:700;}

/* ===== admin ===== */
.admin-table{width:100%;border-collapse:collapse;font-size:13.5px;}
.admin-table th{text-align:left;font-size:11.5px;color:var(--sumi-soft);font-weight:700;letter-spacing:.03em;
  padding:8px 10px;border-bottom:1px solid var(--line);}
.admin-table td{padding:10px 10px;border-bottom:1px solid var(--line);vertical-align:middle;}
.admin-table tr:last-child td{border-bottom:none;}
.chip{display:inline-flex;align-items:center;font-size:11px;font-weight:700;padding:3px 9px;border-radius:99px;}
.chip-admin{background:var(--hanko-tint);color:var(--hanko);}
.chip-user{background:var(--bamboo-tint);color:var(--bamboo);}
.chip-lang{background:var(--indigo-tint);color:var(--indigo-deep);}
.chip-guide{background:var(--gold-tint);color:var(--gold);}
.lm-major-select{border:1px solid var(--line);background:var(--paper-raised);border-radius:99px;padding:9px 18px;
  font-size:19px;font-weight:600;color:var(--sumi);cursor:pointer;}
.chip-muted{background:var(--paper-sunken);color:var(--sumi-soft);}
.row-actions{display:flex;gap:6px;}
.icon-btn{background:none;border:1px solid var(--line);border-radius:7px;padding:5px 8px;cursor:pointer;
  font-size:12px;color:var(--sumi-soft);}
.icon-btn:hover{color:var(--sumi);border-color:var(--sumi-soft);}
.icon-btn:disabled{opacity:.4;cursor:not-allowed;}
.icon-btn:disabled:hover{color:var(--sumi-soft);border-color:var(--line);}
.admin-panel{background:var(--paper-raised);border:1px solid var(--line);border-radius:var(--radius);
  padding:22px 24px;margin-bottom:20px;box-shadow:var(--shadow);}
.admin-panel-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px;gap:12px;flex-wrap:wrap;}
.admin-panel-head h2{margin:0;font-size:16px;}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;}
.form-grid .field.span2{grid-column:1/-1;}
@media (max-width:640px){ .form-grid{grid-template-columns:1fr;} }
.tile--add{background:transparent;border:1px dashed var(--line);box-shadow:none;}
.tile--add:hover{background:var(--indigo-tint);border-color:var(--indigo);}
.tile-icon--add{background:transparent;border:1px dashed var(--sumi-soft);color:var(--sumi-soft);font-size:22px;}
.tile--add:hover .tile-icon--add{border-color:var(--indigo);color:var(--indigo);}
.tile--add .tile-name{color:var(--sumi-soft);}
.tile--add:hover .tile-name{color:var(--indigo);}
.admin-cat-tile{display:flex;flex-direction:column;gap:8px;border-radius:var(--radius);transition:box-shadow .12s;}
.admin-cat-tile .tile{width:100%;}
.admin-cat-tile[draggable="true"]{cursor:grab;}
.admin-cat-tile[draggable="true"]:active{cursor:grabbing;}
.admin-cat-tile.drag-over{box-shadow:0 0 0 2px var(--indigo);}
.admin-cat-tile.drag-over .tile{border-color:var(--indigo);background:var(--indigo-tint);}
.admin-cat-tile-meta{display:flex;align-items:center;justify-content:space-between;font-size:11.5px;
  color:var(--sumi-soft);padding:0 4px;}
.admin-cat-tile-actions{display:flex;gap:6px;flex-wrap:wrap;padding:0 4px;}
.major-drop-target{border-radius:var(--radius);transition:box-shadow .12s;}
.major-drop-target.drag-over{box-shadow:0 0 0 2px var(--bamboo);}
.major-drop-target.drag-over .tile{border-color:var(--bamboo);background:var(--bamboo-tint);}
.mj-lesson-row{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:10px 14px;
  border:1px solid var(--line);border-radius:var(--radius-sm);margin-bottom:8px;background:var(--paper-raised);font-size:13.5px;}
.mj-lesson-info{display:flex;align-items:center;gap:10px;min-width:0;}
.mj-lesson-title{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:600;}
.mj-lesson-actions{display:flex;align-items:center;gap:8px;flex:none;}
.mj-order-select{border:1px solid var(--line);background:var(--paper-sunken);border-radius:7px;padding:5px 8px;
  font-family:var(--font-mono);font-size:12px;font-weight:700;color:var(--sumi);cursor:pointer;}
[data-drag-lesson]{cursor:grab;}
[data-drag-lesson]:active{cursor:grabbing;}
.material-admin-card{border:1px solid var(--line);border-radius:var(--radius-sm);padding:12px;display:flex;gap:12px;
  margin-bottom:10px;background:var(--paper);}
.material-admin-card .thumb{width:96px;height:64px;border-radius:6px;background:var(--paper-sunken);flex:none;overflow:hidden;}
.material-admin-card .thumb img{width:100%;height:100%;object-fit:cover;}
.material-admin-card .info{flex:1;min-width:0;}
.material-admin-card .info .t{font-weight:700;font-size:13.5px;}
.material-admin-card .info .d{color:var(--sumi-soft);font-size:12px;margin-top:2px;}
.admin-note{background:var(--gold-tint);color:var(--gold);border-radius:var(--radius-sm);padding:10px 14px;
  font-size:12.5px;margin-bottom:16px;line-height:1.6;}
.cat-select{max-width:280px;margin-bottom:18px;}

/* ===== database reference panel ===== */
.db-ref-panel{background:var(--paper-raised);border:1px solid var(--line);border-radius:var(--radius);
  padding:18px 20px;margin-bottom:18px;}
.db-ref-head{font-family:var(--font-display);font-weight:800;font-size:15px;margin-bottom:12px;color:var(--sumi);}
.db-ref-tabs{display:flex;gap:6px;margin-bottom:12px;flex-wrap:wrap;}
.db-ref-tab{border:1px solid var(--line);background:var(--paper-sunken);color:var(--sumi-soft);border-radius:99px;
  padding:5px 14px;font-family:var(--font-mono);font-size:12px;font-weight:700;cursor:pointer;}
.db-ref-tab.active{background:var(--indigo);color:#fff;border-color:var(--indigo);}
.db-ref-table{margin-bottom:14px;}
.db-ref-table:last-child{margin-bottom:0;}
.db-ref-table-name{font-family:var(--font-mono);font-weight:700;font-size:13px;color:var(--indigo);margin-bottom:8px;}
.db-ref-table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:8px;}
.db-ref-table-grid{border-collapse:collapse;width:100%;font-family:var(--font-mono);font-size:12px;white-space:nowrap;}
.db-ref-table-grid th{background:var(--paper-sunken);text-align:left;padding:6px 10px;font-weight:700;color:var(--sumi-soft);
  border-bottom:1px solid var(--line);}
.db-ref-table-grid td{padding:6px 10px;border-bottom:1px solid var(--line);color:var(--sumi);}
.db-ref-table-grid tr:last-child td{border-bottom:none;}

/* ===== practice screen ===== */
.practice-head{display:flex;align-items:center;gap:10px;margin-bottom:14px;flex-wrap:wrap;}
.practice-head h1{margin:0;font-size:24px;}
.learning-goal{display:flex;gap:12px;align-items:flex-start;background:var(--gold-tint);border:1px solid var(--line);
  border-radius:var(--radius-sm);padding:14px 16px;margin-bottom:18px;}
.learning-goal .goal-mark{font-size:20px;line-height:1;flex:none;}
.learning-goal .goal-label{font-size:11px;font-weight:700;letter-spacing:.04em;color:var(--gold);margin-bottom:3px;}
.learning-goal p{margin:0;font-size:13.5px;color:var(--sumi);line-height:1.7;}
.term-goal{display:flex;align-items:flex-start;gap:8px;padding:9px 16px;font-size:12px;line-height:1.6;
  color:#c9d1d9;background:#111318;border-bottom:1px solid #000;flex:none;}
.practice-grid{display:grid;grid-template-columns:minmax(300px,640px) 1fr;gap:20px;align-items:start;}
@media (max-width:900px){ .practice-grid{grid-template-columns:1fr;} }
.practice-grid--single{grid-template-columns:1fr;}
.practice-grid--single .practice-left{max-width:none;}
.practice-grid--single .practice-right-next{grid-column:1;}
.practice-grid--single .mirror-input--h2,
.practice-grid--single .body-textarea,
.practice-grid--single .lecture-heading,
.practice-grid--single .lecture-body{max-width:720px;}

.practice-left{background:var(--paper-raised);border:1px solid var(--line);border-radius:var(--radius);
  padding:22px 24px;box-shadow:var(--shadow);}
.lecture-badge{display:inline-block;font-family:var(--font-mono);font-size:11px;font-weight:700;letter-spacing:.05em;
  color:var(--indigo);background:var(--indigo-tint);padding:3px 10px;border-radius:99px;margin-bottom:10px;}
.lecture-heading{font-size:18px;margin:0 0 12px;}
.lecture-body p{margin:0 0 12px;color:var(--sumi);font-size:14px;line-height:1.85;white-space:pre-wrap;}
.lecture-body p:last-child{margin-bottom:0;}
.sample-block{margin-top:16px;}
.hint-toggle-btn{display:inline-flex;align-items:center;gap:6px;background:none;border:1px dashed var(--gold);
  color:var(--gold);border-radius:99px;padding:7px 14px;font-size:12.5px;font-weight:700;cursor:pointer;font-family:var(--font-body);}
.hint-toggle-btn:hover{background:var(--gold-tint);}
.sample-label{font-size:11.5px;color:var(--sumi-soft);margin:12px 0 6px;font-weight:700;}
.sample-code{background:var(--paper-sunken);border:1px solid var(--line);border-radius:var(--radius-sm);
  padding:12px 14px;font-family:var(--font-mono);font-size:12.5px;line-height:1.6;white-space:pre-wrap;
  margin:0;color:var(--sumi);overflow-x:auto;}
.practice-status{margin-top:18px;font-size:12.5px;color:var(--gold);background:var(--gold-tint);
  border-radius:var(--radius-sm);padding:9px 12px;line-height:1.6;}
.practice-controls{margin-top:20px;display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;}
.practice-controls-secondary{display:flex;gap:8px;flex-wrap:wrap;}
.btn-ghost.is-fav{color:var(--hanko);border-color:var(--hanko-tint);background:var(--hanko-tint);}

.practice-right{display:flex;flex-direction:column;background:#0b0d10;border-radius:var(--radius);
  overflow:hidden;box-shadow:var(--shadow);border:1px solid #000;min-height:420px;}
.practice-right-next{grid-column:2;margin-top:16px;display:flex;justify-content:flex-end;}
.practice-right-next .btn{width:auto;}
@media (max-width:900px){ .practice-right-next{grid-column:1;} }
.term-bar{display:flex;align-items:center;gap:7px;padding:9px 12px;background:#15171b;border-bottom:1px solid #000;flex:none;}
.term-dot{width:10px;height:10px;border-radius:50%;display:inline-block;}
.term-dot.d1{background:#ff5f56;} .term-dot.d2{background:#ffbd2e;} .term-dot.d3{background:#27c93f;}
.term-label{margin-left:8px;font-family:var(--font-mono);font-size:11.5px;color:#7d8590;}
.term-bar .btn{background:rgba(255,107,94,.12);color:#ff6b5e;border-color:rgba(255,107,94,.45);}
.term-bar .btn:hover{background:rgba(255,107,94,.22);}
.editor-wrap{position:relative;flex:1;min-height:260px;}
.editor-highlight,.editor-input{position:absolute;inset:0;margin:0;padding:16px;font-family:var(--font-mono);
  font-size:13.5px;line-height:1.65;white-space:pre-wrap;word-break:break-word;box-sizing:border-box;overflow:auto;}
.editor-highlight{color:#c9d1d9;pointer-events:none;}
.editor-highlight .err{color:#ff6b5e;background:rgba(255,107,94,.16);border-radius:2px;}
.editor-input{background:transparent;color:transparent;caret-color:#fff;border:none;resize:none;outline:none;}
.editor-input::placeholder{color:#525860;}
.console-panel{border-top:1px solid #000;background:#0b0d10;padding:12px 16px 16px;min-height:74px;flex:none;}
.console-label{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.06em;color:#6a7079;
  margin-bottom:6px;text-transform:uppercase;}
.console-body{font-family:var(--font-mono);font-size:12.5px;color:#7d8590;white-space:pre-wrap;line-height:1.6;}
.console-success{color:#27c93f;font-weight:700;letter-spacing:.02em;}
.console-error{color:#ff6b5e;font-weight:700;letter-spacing:.02em;}
.console-output{color:#c9d1d9;margin-top:2px;}
.console-output--error{color:#ffb4ab;}

/* ===== practice page layout + learning roadmap sidebar (fixed, like the left nav sidebar) ===== */
.practice-page-layout{display:block;}
.practice-main{margin-right:300px;}
.lesson-sidebar-toggle{display:none;}
.lesson-sidebar{
  position:fixed;top:58px;right:0;bottom:0;width:280px;flex:none;display:flex;flex-direction:column;
  background:var(--paper-raised);border-left:1px solid var(--line);padding:18px 16px;overflow:hidden;z-index:10;
}
.lesson-sidebar-card{background:var(--paper-raised);border:1px solid var(--line);border-radius:var(--radius);
  padding:18px 18px;box-shadow:var(--shadow);margin-bottom:16px;flex:none;}
.lesson-sidebar-card--roadmap{padding-bottom:10px;flex:1;display:flex;flex-direction:column;min-height:0;margin-bottom:0;}
.lesson-sidebar-eyebrow{font-size:11px;font-weight:700;color:var(--sumi-soft);letter-spacing:.05em;margin-bottom:6px;flex:none;}
.lesson-sidebar-title{font-family:var(--font-display);font-weight:800;font-size:16px;color:var(--sumi);margin-bottom:12px;}
.roadmap-list{flex:1;min-height:120px;overflow-y:auto;overflow-x:hidden;padding-right:4px;}
.roadmap-scroll-top-btn{flex:none;width:100%;margin-top:10px;}
.roadmap-item{display:flex;gap:10px;cursor:pointer;padding:6px 8px;border-radius:10px;}
.roadmap-item:hover{background:var(--paper-sunken);}
.roadmap-item.is-current,.roadmap-item.is-viewing{background:var(--indigo-tint);}
.roadmap-item.is-locked{cursor:not-allowed;opacity:.55;}
.roadmap-item.is-locked:hover{background:none;}
.roadmap-rail{display:flex;flex-direction:column;align-items:center;flex:none;width:22px;}
.roadmap-dot{width:22px;height:22px;border-radius:50%;background:var(--paper-sunken);color:var(--sumi-soft);
  display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:700;flex:none;}
.roadmap-item.is-done .roadmap-dot{background:var(--bamboo);color:#fff;}
.roadmap-item.is-current .roadmap-dot{background:var(--indigo);color:#fff;}
.roadmap-item.is-locked .roadmap-dot{background:var(--paper-sunken);color:var(--sumi-soft);font-size:10px;}
.roadmap-line{width:2px;flex:1;background:var(--line);margin-top:2px;min-height:10px;}
.roadmap-item:last-child .roadmap-line{background:transparent;}
.roadmap-content{flex:1;min-width:0;padding-bottom:14px;}
.roadmap-item:last-child .roadmap-content{padding-bottom:2px;}
.roadmap-step-label{font-family:var(--font-mono);font-size:10.5px;font-weight:700;color:var(--sumi-soft);letter-spacing:.03em;}
.roadmap-step-title{font-size:13px;font-weight:600;color:var(--sumi);margin-top:2px;line-height:1.4;}
.roadmap-current-tag{display:inline-block;font-size:10.5px;font-weight:700;color:var(--indigo-deep);margin-top:4px;}
.roadmap-current-tag--done{color:var(--bamboo);}
.roadmap-current-tag--locked{color:var(--sumi-soft);font-weight:600;}

@media (max-width:900px){
  .practice-main{margin-right:0;}
  .lesson-sidebar-toggle{display:inline-flex;width:100%;margin:14px 0;}
  .lesson-sidebar{display:none;position:static;top:auto;right:auto;bottom:auto;width:auto;
    border-left:none;padding:0;background:transparent;overflow:visible;z-index:auto;}
  .lesson-sidebar.mobile-open{display:flex;}
  .lesson-sidebar-card--roadmap{flex:none;}
  .roadmap-list{flex:none;max-height:360px;}
}

.field textarea.mono{font-family:var(--font-mono);font-size:12.5px;}

/* ===== admin lesson mirror editor ===== */
.lesson-tabs{display:flex;gap:6px;margin-bottom:14px;flex-wrap:wrap;}
.lesson-tab{background:var(--paper-sunken);border:1px solid var(--line);border-radius:99px;padding:6px 14px;
  font-size:12.5px;font-weight:700;color:var(--sumi-soft);cursor:pointer;font-family:var(--font-body);}
.lesson-tab.active{background:var(--indigo);color:#fff;border-color:var(--indigo);}
.lesson-tab--add{background:none;border-style:dashed;color:var(--indigo);}
.mirror-input{border:none;background:transparent;border-bottom:1px dashed var(--line);width:100%;padding:3px 0;
  font-family:var(--font-body);font-size:13.5px;color:var(--sumi);}
.mirror-input:focus{border-bottom-color:var(--indigo);outline:none;}
.mirror-input--h1{font-family:var(--font-display);font-weight:800;font-size:24px;color:var(--sumi);letter-spacing:-0.01em;}
.mirror-input--h2{font-weight:700;font-size:18px;color:var(--sumi);margin:0 0 12px;padding:3px 0;}
.body-textarea{border:1px dashed var(--line);border-radius:8px;background:transparent;width:100%;min-height:110px;
  padding:10px;font-family:var(--font-body);font-size:14px;line-height:1.85;color:var(--sumi);resize:vertical;
  box-sizing:border-box;margin-bottom:14px;}
.body-textarea:focus{border-color:var(--indigo);outline:none;}
.admin-code-input{width:100%;height:100%;box-sizing:border-box;padding:16px;border:none;outline:none;resize:none;
  background:transparent;color:#c9d1d9;font-family:var(--font-mono);font-size:13.5px;line-height:1.65;}
.admin-code-input::placeholder{color:#525860;}
.admin-output-input{width:100%;min-height:48px;background:transparent;border:none;outline:none;resize:vertical;
  color:#c9d1d9;font-family:var(--font-mono);font-size:12.5px;line-height:1.6;padding:0;box-sizing:border-box;}
.admin-output-input::placeholder{color:#525860;}
.exercise-block{border:1px solid var(--line);border-radius:var(--radius-sm);padding:14px;margin-bottom:12px;background:var(--paper);}
.exercise-block-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px;
  font-size:12.5px;font-weight:700;color:var(--sumi-soft);}

/* ===== toast ===== */
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:var(--sumi);color:var(--paper);
  padding:11px 20px;border-radius:99px;font-size:13px;z-index:200;box-shadow:var(--shadow);
  opacity:0;transition:opacity .2s;pointer-events:none;}
.toast.show{opacity:1;}
@media (max-width:900px){ .toast{bottom:78px;} }

/* ===== material import ===== */
.import-section{border-top:1px solid var(--line);padding-top:18px;margin-top:18px;}
.import-section:first-of-type{border-top:none;padding-top:0;margin-top:0;}
.import-section h3{margin:0 0 8px;font-size:15px;}
.import-dropzone{border:2px dashed var(--line);border-radius:var(--radius);padding:32px 20px;text-align:center;
  color:var(--sumi-soft);margin-top:10px;transition:border-color .15s,background .15s;}
.import-dropzone.drag-over{border-color:var(--indigo);background:var(--indigo-tint);color:var(--indigo);}
.import-dropzone-icon{font-size:28px;margin-bottom:8px;}
.import-dropzone .btn{margin-top:6px;}
.import-error-box{margin-top:16px;background:var(--hanko-tint);border:1px solid var(--hanko);border-radius:var(--radius-sm);
  padding:14px 16px;}
.import-error-title{font-weight:700;color:var(--hanko);margin-bottom:8px;font-size:13.5px;}
.import-error-box ul{margin:0;padding-left:18px;font-size:13px;color:var(--sumi);line-height:1.8;}
.import-preview-box{margin-top:16px;background:var(--paper-raised);border:1px solid var(--line);
  border-radius:var(--radius);padding:18px 20px;}
.import-preview-title{font-weight:700;margin-bottom:12px;font-size:14px;}
.import-preview-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px 20px;margin-bottom:16px;}
.import-preview-grid .k{display:block;font-size:11.5px;color:var(--sumi-soft);font-weight:700;}
.import-preview-grid .v{font-size:13.5px;}
.import-step-list{max-height:260px;overflow-y:auto;border:1px solid var(--line);border-radius:var(--radius-sm);
  margin-bottom:16px;}
.import-step-row{display:flex;align-items:center;gap:10px;padding:8px 12px;border-bottom:1px solid var(--line);font-size:13px;}
.import-step-row:last-child{border-bottom:none;}

.import-target-row{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:22px;}
@media (max-width:640px){ .import-target-row{grid-template-columns:1fr;} }
.import-target-box{background:var(--paper-sunken);border:1px solid var(--line);border-radius:var(--radius);padding:14px 16px;}
.import-target-label{font-size:12.5px;font-weight:700;color:var(--sumi-soft);margin-bottom:10px;letter-spacing:.02em;}
.req-mark{color:var(--hanko);font-size:11px;font-weight:700;margin-left:6px;letter-spacing:0;}
.import-target-picker{display:flex;align-items:center;gap:12px;width:100%;background:var(--paper-raised);
  border:1px solid var(--line);border-radius:var(--radius-sm);padding:8px 14px;cursor:pointer;text-align:left;}
.import-target-picker:hover{border-color:var(--indigo);}
.import-target-picker:disabled{cursor:not-allowed;opacity:.6;}
.import-target-picker:disabled:hover{border-color:var(--line);}
.import-target-picker .tile-icon{flex:none;}
.import-target-add-icon{width:34px;height:34px;border-radius:10px;display:flex;align-items:center;justify-content:center;
  font-size:16px;flex:none;background:transparent;border:1px dashed var(--sumi-soft);color:var(--sumi-soft);}
.import-target-name{font-size:14px;font-weight:700;color:var(--sumi);}
.import-target-placeholder{font-weight:600;color:var(--sumi-soft);}