/* Kenshin — learner app styles. Design language carried over from the
   Cisco BJJ training guide: near-black / white, red accent, Oswald caps,
   thin rules, category stripe on cards. */
:root{
  --red:#d20a0a;
  --font-display:'Oswald','Haettenschweiler','Arial Narrow',Impact,sans-serif;
  --font-body:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
  --maxw:1180px;
  --header-h:64px;
  --radius:3px;
  --ease:cubic-bezier(.2,.7,.3,1);
}
html[data-theme="dark"]{
  --bg:#0a0a0b; --bg-alt:#0f0f11; --surface:#141416; --surface-2:#1b1b1e;
  --border:#2a2a2f; --border-strong:#3a3a41;
  --text:#f6f6f7; --text-2:#c9c9cf; --muted:#8e8e97;
  --accent:#ff2020; --red-fill:#d20a0a; --accent-ink:#fff;
  --ok:#3ccf7a; --warn:#f2b33d; --overlay:rgba(0,0,0,.78);
}
html[data-theme="light"]{
  --bg:#fff; --bg-alt:#f6f6f7; --surface:#fff; --surface-2:#f2f2f4;
  --border:#d8d8dd; --border-strong:#0a0a0b;
  --text:#0a0a0b; --text-2:#33333a; --muted:#61616b;
  --accent:#c00707; --red-fill:#c00707; --accent-ink:#fff;
  --ok:#137a3e; --warn:#8a5a00; --overlay:rgba(10,10,11,.6);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden;padding-bottom:env(safe-area-inset-bottom)}
img{max-width:100%;display:block}
button{font:inherit;color:inherit;background:none;border:none;cursor:pointer}
a{color:inherit}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.shell{max-width:var(--maxw);margin:0 auto;padding:0 20px}
@media(max-width:640px){.shell{padding:0 16px}}
.muted{color:var(--muted)} .small{font-size:13px}
.skip{position:absolute;left:-9999px;top:8px;background:var(--red-fill);color:#fff;padding:8px 12px;z-index:999}
.skip:focus{left:8px}
[hidden]{display:none!important}

/* type */
.lbl{font-family:var(--font-display);font-weight:600;text-transform:uppercase;letter-spacing:.14em;font-size:11px;line-height:1.2;color:var(--muted)}
.lbl-red{color:var(--accent)}
h1,h2,h3{font-family:var(--font-display);text-transform:uppercase;letter-spacing:.02em;line-height:1.05;margin:0}
h1{font-size:clamp(36px,7vw,64px);font-weight:700}
h2{font-size:clamp(22px,3.4vw,30px);font-weight:600}
h3{font-size:18px;font-weight:600;letter-spacing:.04em}
.kicker{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.kicker::before{content:"";width:28px;height:3px;background:var(--accent)}

/* header */
.hdr{position:sticky;top:0;z-index:120;background:var(--bg);border-bottom:1px solid var(--border)}
.hdr-in{max-width:var(--maxw);margin:0 auto;padding:0 20px;height:var(--header-h);display:flex;align-items:center;gap:18px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;min-width:0;flex:1}
.brand-logo{height:34px;width:auto;max-width:120px;object-fit:contain}
.brand-name{font-family:var(--font-display);font-weight:700;font-size:20px;letter-spacing:.06em;text-transform:uppercase;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.topnav{display:flex;gap:4px}
.topnav a{font-family:var(--font-display);font-size:13px;letter-spacing:.1em;text-transform:uppercase;text-decoration:none;color:var(--muted);padding:8px 10px;border-bottom:2px solid transparent}
.topnav a:hover{color:var(--text)}
.topnav a.on{color:var(--text);border-bottom-color:var(--accent)}
.icon-btn{width:40px;height:40px;display:grid;place-items:center;border:1px solid var(--border);border-radius:var(--radius);flex:none}
.icon-btn:hover{border-color:var(--border-strong)}
html[data-theme="dark"] .ico-moon,html[data-theme="light"] .ico-sun{display:none}
@media(max-width:860px){.topnav{display:none}}

/* bottom nav (phones) */
.botnav{display:none}
@media(max-width:860px){
  .botnav{display:grid;grid-template-columns:repeat(5,1fr);position:fixed;left:0;right:0;bottom:0;z-index:130;background:var(--bg);border-top:1px solid var(--border);padding-bottom:env(safe-area-inset-bottom)}
  .botnav a{display:flex;flex-direction:column;align-items:center;gap:2px;padding:8px 0 7px;text-decoration:none;color:var(--muted);font-size:11px;font-family:var(--font-display);letter-spacing:.08em;text-transform:uppercase;min-height:56px;justify-content:center}
  .botnav svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linejoin:round;stroke-linecap:round}
  .botnav a.on{color:var(--accent)}
  body{padding-bottom:calc(64px + env(safe-area-inset-bottom))}
}

main{min-height:60vh;outline:none}
.boot{padding:60px 20px}
section.block{padding:36px 0;border-bottom:1px solid var(--border)}
section.block:last-child{border-bottom:none}

/* buttons & inputs */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:0 18px;border:1px solid var(--border-strong);border-radius:var(--radius);font-family:var(--font-display);font-weight:600;text-transform:uppercase;letter-spacing:.1em;font-size:13px;text-decoration:none;background:transparent;color:var(--text)}
.btn:hover{border-color:var(--text)}
.btn-red{background:var(--red-fill);border-color:var(--red-fill);color:var(--accent-ink)}
.btn-red:hover{filter:brightness(1.1);border-color:var(--red-fill)}
.btn-sm{min-height:36px;padding:0 12px;font-size:12px}
.btn[disabled]{opacity:.5;cursor:default}
.linkbtn{color:var(--accent);text-decoration:underline;text-underline-offset:3px;padding:0}
.field{display:block;margin:0 0 14px}
.field>span{display:block;margin-bottom:6px}
.inp,select.inp,textarea.inp{width:100%;min-height:46px;padding:10px 12px;background:var(--surface);color:var(--text);border:1px solid var(--border);border-radius:var(--radius);font:inherit}
.inp:focus{border-color:var(--accent);outline:none}
.msg{font-size:14px;margin-top:10px;min-height:1em}
.msg.err{color:var(--accent)} .msg.ok{color:var(--ok)}

/* search */
.search{position:relative}
.search input{padding-left:42px;min-height:52px;font-size:17px}
.search svg{position:absolute;left:14px;top:50%;transform:translateY(-50%);width:18px;height:18px;stroke:var(--muted);fill:none;stroke-width:2}

/* hero */
.hero{padding:44px 0 34px;border-bottom:1px solid var(--border)}
.hero-logo{height:72px;width:auto;margin-bottom:18px}
.hero .sub{font-family:var(--font-display);font-size:clamp(16px,2.6vw,22px);letter-spacing:.06em;text-transform:uppercase;color:var(--text-2);margin:8px 0 0}
.hero .meta{margin:16px 0 0;font-family:var(--font-display);letter-spacing:.12em;text-transform:uppercase;font-size:13px;color:var(--text-2)}
.hero .lead{max-width:640px;color:var(--text-2);font-size:17px;margin:18px 0 22px}

/* tiles */
.tiles{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:18px}
@media(max-width:860px){.tiles{grid-template-columns:repeat(2,1fr)}}
.tile{display:block;text-decoration:none;background:var(--surface);border:1px solid var(--border);border-left:3px solid var(--cat,var(--border-strong));border-radius:var(--radius);padding:14px 16px}
.tile:hover{border-color:var(--border-strong)}
.tile b{display:block;font-family:var(--font-display);font-size:28px;line-height:1}
.tile span{font-family:var(--font-display);text-transform:uppercase;letter-spacing:.1em;font-size:12px;color:var(--muted)}

/* chips (filters) */
.filters{display:flex;flex-direction:column;gap:12px;margin:16px 0 8px}
.chips{display:flex;gap:6px;overflow-x:auto;padding-bottom:4px;scrollbar-width:thin}
.chip{flex:none;display:inline-flex;align-items:center;min-height:36px;padding:0 12px;border:1px solid var(--border);border-radius:999px;font-size:13px;font-weight:500;color:var(--text-2);white-space:nowrap}
.chip:hover{border-color:var(--border-strong)}
.chip.on{background:var(--text);border-color:var(--text);color:var(--bg)}
.chip .n{opacity:.6;margin-left:4px;font-variant-numeric:tabular-nums}
.filter-row{display:flex;align-items:center;gap:10px}
.filter-row .lbl{width:74px;flex:none}
@media(max-width:640px){.filter-row{flex-direction:column;align-items:stretch;gap:6px}.filter-row .lbl{width:auto}}
.resultbar{display:flex;justify-content:space-between;align-items:center;gap:10px;margin:14px 0 10px;font-size:14px;color:var(--muted)}

/* cards */
.sec-head{display:flex;align-items:baseline;gap:12px;margin:30px 0 6px}
.sec-head .num{font-family:var(--font-display);color:var(--accent);font-size:15px}
.sec-blurb{color:var(--text-2);max-width:720px;margin:0 0 14px;font-size:15px}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
@media(max-width:1000px){.grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:640px){.grid{grid-template-columns:1fr}}
.card{position:relative;display:flex;flex-direction:column;text-align:left;text-decoration:none;background:var(--surface);border:1px solid var(--border);border-left:3px solid var(--cat,var(--border-strong));border-radius:var(--radius);padding:16px 18px 14px;transition:border-color .14s var(--ease)}
.card:hover{border-color:var(--border-strong)}
.card .top{display:flex;justify-content:space-between;gap:8px;align-items:center}
.card h3{margin:8px 0 6px;font-size:19px}
.card p{margin:0;color:var(--text-2);font-size:14px;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.card .foot{display:flex;flex-wrap:wrap;gap:6px;margin-top:12px;align-items:center}
.badge{display:inline-flex;align-items:center;gap:4px;min-height:22px;padding:0 8px;border:1px solid var(--border-strong);border-radius:2px;font-family:var(--font-display);font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--text-2)}
.badge.red{border-color:var(--accent);color:var(--accent)}
.badge.ok{border-color:var(--ok);color:var(--ok)}
.badge.warn{border-color:var(--warn);color:var(--warn)}
.st{font-family:var(--font-display);font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.st.training{color:var(--warn)} .st.review{color:var(--accent)} .st.mastered{color:var(--ok)}
.empty{padding:40px 0;color:var(--muted)}

/* panels */
.panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:18px 20px;margin:14px 0}
.panel-red{border-left:3px solid var(--accent)}
.panel h3{margin-bottom:8px}
.panel p{margin:0 0 8px;color:var(--text-2)}
.scoring{display:grid;grid-template-columns:repeat(6,1fr);gap:8px;margin-top:10px}
@media(max-width:640px){.scoring{grid-template-columns:repeat(3,1fr)}}
.scoring div{border:1px solid var(--border);padding:10px;text-align:center}
.scoring b{display:block;font-family:var(--font-display);font-size:24px;color:var(--accent)}
.scoring span{font-family:var(--font-display);font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}

/* technique page */
.crumbs{display:flex;gap:8px;align-items:center;padding:16px 0 0;font-size:14px;flex-wrap:wrap}
.crumbs a{color:var(--muted);text-decoration:none}
.crumbs a:hover{color:var(--text)}
.tech-hd{padding:14px 0 18px;border-bottom:1px solid var(--border)}
.tech-hd h1{font-size:clamp(30px,6vw,52px);margin:10px 0 12px}
.tech-badges{display:flex;flex-wrap:wrap;gap:6px}
.draft{margin-top:12px;font-size:13px;color:var(--warn)}
.tech-body{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:34px;padding:24px 0 40px}
@media(max-width:960px){.tech-body{grid-template-columns:1fr;gap:20px}}
.dsec{padding:16px 0;border-bottom:1px solid var(--border)}
.dsec:last-child{border-bottom:none}
.dsec h2{font-size:14px;letter-spacing:.14em;color:var(--accent);margin-bottom:8px}
.dsec p{margin:0;color:var(--text-2);font-size:16px}
.dsec.lead p{font-size:18px;color:var(--text)}
.dsec.danger{border-left:3px solid var(--accent);padding-left:14px}
.video{position:relative;aspect-ratio:16/9;background:var(--surface-2);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}
.video iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.video-ph{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;text-align:center;padding:16px;color:var(--muted)}
.video-ph svg{width:40px;height:40px;stroke:var(--muted);fill:none;stroke-width:1.5}
.side .panel{margin-top:0;margin-bottom:12px}
.status-btns{display:grid;grid-template-columns:repeat(2,1fr);gap:6px;margin-top:10px}
.status-btns button{min-height:44px;border:1px solid var(--border);border-radius:var(--radius);font-family:var(--font-display);font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--text-2)}
.status-btns button.on{border-color:var(--text);background:var(--text);color:var(--bg)}
.confirmed{display:flex;gap:8px;align-items:center;margin-top:12px;font-size:14px;color:var(--ok)}
.related a{display:flex;justify-content:space-between;gap:10px;padding:10px 0;border-bottom:1px solid var(--border);text-decoration:none;font-size:15px}
.related a:last-child{border-bottom:none}
.related a:hover{color:var(--accent)}
.pager{display:flex;justify-content:space-between;gap:10px;padding:18px 0;border-top:1px solid var(--border)}

/* progress */
.bar{display:flex;height:10px;background:var(--surface-2);border-radius:2px;overflow:hidden;margin:6px 0 2px}
.bar i{display:block;height:100%}
.bar .m{background:var(--ok)} .bar .r{background:var(--accent)} .bar .t{background:var(--warn)}
.prog-row{padding:12px 0;border-bottom:1px solid var(--border)}
.prog-row .top{display:flex;justify-content:space-between;gap:10px;font-size:14px}
.legend{display:flex;flex-wrap:wrap;gap:14px;font-size:13px;color:var(--muted);margin:8px 0}
.legend i{display:inline-block;width:10px;height:10px;margin-right:6px;vertical-align:-1px}

/* auth */
.auth{max-width:440px;margin:40px auto;padding:0 4px}
.auth .panel{padding:24px}
.tabs{display:flex;border-bottom:1px solid var(--border);margin-bottom:18px}
.tabs button{flex:1;min-height:44px;font-family:var(--font-display);letter-spacing:.1em;text-transform:uppercase;font-size:13px;color:var(--muted);border-bottom:2px solid transparent}
.tabs button.on{color:var(--text);border-bottom-color:var(--accent)}
.radio-cards{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-bottom:14px}
.radio-cards label{border:1px solid var(--border);border-radius:var(--radius);padding:12px;cursor:pointer;font-size:14px}
.radio-cards input{margin-right:6px}
.radio-cards label:has(input:checked){border-color:var(--accent)}

/* learner switch */
.learner{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin:14px 0 0;font-size:14px}
.learner select{min-height:38px;width:auto}

.ftr{border-top:1px solid var(--border);padding:24px 0 30px;margin-top:40px}
.ftr p{margin:4px 0}
.toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%) translateY(20px);opacity:0;pointer-events:none;background:var(--text);color:var(--bg);padding:10px 16px;border-radius:var(--radius);font-size:14px;z-index:300;transition:all .2s var(--ease)}
.toast.on{opacity:1;transform:translateX(-50%) translateY(0)}
@media(max-width:860px){.toast{bottom:84px}}

.filters-wrap{margin:12px 0 0}
.filters-wrap>summary{list-style:none;width:max-content}
.filters-wrap>summary::-webkit-details-marker{display:none}
@media(min-width:861px){.filters-wrap>summary{display:none}}