*,*::before,*::after{box-sizing:border-box}

:root{
  --bg:#2a3140;
  --panel:#1b212e;
  --muted:#97a1b3;
  --text:#e6eaf2;
  --stroke:rgba(255,255,255,.12);
  --radius:14px;
  --shadow:0 10px 32px rgba(0,0,0,.35);
  --gap:16px;

  --accent:#2563eb;
  --accent-2:#0ea5e9;

  --yellow:#facc15;
  --orange:#fb923c;
  --green:#10b981;
  --blue:#3b82f6;
  --bluebrown:#a16207;

  /* Desktop-only trim for study panel/card height. Adjust this to control how much shorter the card becomes on desktop. */
  --card-trim: 0px; /* mobile & default */

  background:
    radial-gradient(900px 600px at 20% -10%, rgba(45,56,138,.25), transparent 60%),
    radial-gradient(800px 500px at 110% 0%, rgba(0,174,239,.18), transparent 50%), var(--bg);
  color:var(--text);
  font-family:system-ui,-apple-system,Segoe UI,Roboto,Inter,Arial,sans-serif;
  line-height:1.55;
}

html{min-height:100%;scroll-behavior:smooth}
body{min-height:100%;margin:0}
button,input{font:inherit}
[hidden]{display:none!important}

/* Apply the 20px reduction to desktop only. Change 20px here to tweak later. */
@media (min-width: 901px){
  :root{ --card-trim: 20px; }
}

a{color:inherit;text-decoration:none}
.container{max-width:1080px;margin:0 auto;padding:24px}

header{position:sticky;top:0;z-index:50;background:linear-gradient(to bottom, rgba(26,32,41,.9), rgba(26,32,41,.6) 60%, transparent);backdrop-filter:saturate(140%) blur(6px)}
.hdr{display:flex;gap:12px;align-items:center;justify-content:space-between;padding:16px 24px}
.brand{display:flex;align-items:flex-start;gap:12px}
.brand-copy{min-width:0}
.brand-title-row{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.brand h1{margin:0;font-size:20px;letter-spacing:.3px}
.brand-marker{flex:0 0 auto;margin-top:9px;background:linear-gradient(90deg,#0ea5e9,#2563eb)}
.byline{color:var(--muted);font-size:13px;margin-left:8px;font-weight:500}
.tag{color:var(--muted);font-size:13px}

.filters{display:flex;flex-wrap:wrap;gap:10px}
.filters-container{padding-top:0;padding-bottom:12px}
.chip{background:var(--panel);border:1px solid var(--stroke);padding:8px 12px;border-radius:999px;display:flex;gap:8px;align-items:center;cursor:pointer;user-select:none;box-shadow:none}
.chip input{accent-color:var(--accent)}
.actions{display:flex;gap:10px}

.btn{background:var(--panel);border:1px solid var(--stroke);color:var(--text);padding:12px 18px;border-radius:10px;box-shadow:var(--shadow);cursor:pointer}
.btn.primary{background:linear-gradient(135deg,#2d388a,#00aeef);border:0;color:#ffffff;font-weight:700;box-shadow:0 8px 24px rgba(0,174,239,.35)}
.btn.ghost{background:transparent;border:1px solid var(--stroke)}
.btn.exit{background:linear-gradient(135deg,#4c0c0c,#c13838);border:0;color:#ffffff;font-weight:700;box-shadow:0 8px 24px rgba(220,38,38,.35)}
.btn:disabled{cursor:not-allowed;opacity:.45;box-shadow:none}
.btn:focus-visible,.tech-link:focus-visible,.chip:focus-within,.support-link:focus-visible,.footer-link:focus-visible,.card:focus-visible{outline:3px solid #7dd3fc;outline-offset:3px}

.support-link{display:inline-flex;align-items:center;gap:7px;padding:8px 12px;border-radius:9px;background:#8297ff;color:#111827;font-size:13px;font-weight:800;box-shadow:0 6px 18px rgba(0,0,0,.25)}
.support-link:hover{filter:brightness(1.06)}

.start-bottom{position:fixed;left:0;right:0;bottom:10px;display:block;z-index:60;}
.start-bottom .inner{max-width:560px;margin:0 auto;display:flex;gap:10px;justify-content:center}
.start-bottom .btn{width:90%;height:52px;font-weight:600}
@media (max-width: 720px){header{position:static;top:auto}}

.grid{display:grid;grid-template-columns:1.1fr .9fr;gap:20px}
@media (max-width: 900px){.grid{grid-template-columns:1fr}}

@media (max-width: 900px){
  body.studying #lists{display:none;}
  body.studying .study{margin-top:0;}
  .study-ctrls{margin-bottom:10px;}

  /* Force extra scroll space below fixed buttons */
  body::after{
    content:"";
    display:block;
    height:35px; /* extra scroll room */
  }
}

section{background:var(--panel);border:1px solid var(--stroke);border-radius:var(--radius);padding:16px;box-shadow:var(--shadow)}
section + section{margin-top:16px}
.belt-title{margin:0 0 8px;font-size:18px;display:flex;align-items:center;gap:8px}
.belt-dot{width:10px;height:10px;border-radius:999px;display:inline-block}

.technique-category{margin:6px 0 6px;color:var(--muted);font-size:13px;font-weight:600}
.technique-category--spaced{margin-top:10px}
.tech-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:10px;margin:8px 0 0;padding:0;list-style:none}
.tech-link{display:flex;align-items:center;justify-content:center;text-align:center;padding:12px 10px;border-radius:10px;background:#222a37;border:1px solid var(--stroke);min-height:48px;transition:.15s transform ease,.15s border-color ease}
.tech-link:hover{transform:translateY(-2px);border-color:rgba(31,36,48,.25)}
.tech-link:focus{outline:2px solid var(--accent)}

/*
  The study panel's height previously: calc(100dvh - 96px)
  We now subtract --card-trim (desktop-only 20px by default) so the card/controls never get hidden under the header.
*/
.study{position:sticky;top:72px;height:calc(100dvh - 96px - var(--card-trim));display:flex;flex-direction:column;gap:12px}

.card{position:relative;flex:1;display:grid;place-items:center;background:var(--panel);border:1px solid var(--stroke);border-radius:18px;box-shadow:var(--shadow);padding:24px;perspective:1200px;cursor:pointer}
.card::before{content:"";position:absolute;inset:-2px;border-radius:20px;background:linear-gradient(135deg,#2d388a,#00aeef);opacity:0;transition:opacity .25s ease;z-index:0}
body.studying .card::before{opacity:1}
.card > *{position:relative;z-index:1}
.card-belt{position:absolute;top:12px;left:12px;right:12px;height:8px;border-radius:999px;background:var(--belt-color,#d1d5db)}
.card[data-belt="yellow"],dialog[data-belt="yellow"]{--belt-color:var(--yellow)}
.card[data-belt="orange"],dialog[data-belt="orange"]{--belt-color:var(--orange)}
.card[data-belt="green"],dialog[data-belt="green"]{--belt-color:var(--green)}
.card[data-belt="blue"],dialog[data-belt="blue"]{--belt-color:var(--blue)}
.card[data-belt="bluebrown"],dialog[data-belt="bluebrown"]{--belt-color:var(--bluebrown)}
.card-inner{position:relative;width:100%;height:100%;max-width:640px;border-radius:16px;display:grid;place-items:center;transform-style:preserve-3d;transition:transform .22s ease}
.card.is-flipped .card-inner{transform:rotateY(180deg)}
.face{position:absolute;inset:0;border-radius:16px;display:grid;place-items:center;padding:40px 24px 24px;background:#111827;backface-visibility:hidden;border:1px solid var(--stroke)}
.face h3{margin:6px 0 10px;font-size:28px;text-align:center}
.meta{color:var(--muted);font-size:14px}
.back{transform:rotateY(180deg)}
.back-content{text-align:center}
.face img{max-width:100%;height:auto;border-radius:12px;border:1px solid var(--stroke)}
.img-slab{width:100%;height:100%;display:flex;align-items:center;justify-content:center;background:rgba(0,0,0,.2);border-radius:12px;padding:12px}
.image-fallback{color:var(--muted);font-weight:700;text-align:center}
@media (min-width: 901px){.img-slab img{max-height:min(85vh, calc(100% - 24px)); max-width:100%; width:auto; height:auto;}}

.study-ctrls{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;justify-content:center;max-width:300px;margin:0 auto}
.study-ctrls .btn{height:44px}
.hint{font-size:12px;color:var(--muted);text-align:center}

dialog::backdrop{background:rgba(31,36,48,.45)}
dialog{border:1px solid var(--stroke);border-radius:14px;max-width:min(92vw,980px);max-height:92vh;padding:0;background:var(--panel);color:var(--text);box-shadow:var(--shadow)}
dialog[open]{display:flex;flex-direction:column}
.modal-belt{height:6px;background:var(--belt-color,#d1d5db);border-top-left-radius:14px;border-top-right-radius:14px}
.modal-hdr{display:flex;justify-content:space-between;align-items:center;padding:12px 16px;border-bottom:1px solid var(--stroke)}
.modal-body{padding:12px 16px;overflow:auto;display:flex;align-items:center;justify-content:center}
.modal-body img{max-width:100%;width:auto;height:auto;display:block;border-radius:10px;border:1px solid var(--stroke);object-fit:contain}
.modal-image-fallback{margin:32px;color:var(--muted);font-weight:700;text-align:center}
@media (min-width: 901px){.modal-body img{max-height:85vh;max-width:88vw;width:auto;height:auto;}}

.yellow .belt-dot{background:var(--yellow)}
.orange .belt-dot{background:var(--orange)}
.green .belt-dot{background:var(--green)}
.blue .belt-dot{background:var(--blue)}
.bluebrown .belt-dot{background:var(--bluebrown)}

.jp{position:relative; display:inline-block; cursor:help; border-bottom:1px dashed rgba(18,21,27,.25)}
.jp:focus{outline:2px solid var(--accent); outline-offset:2px}
.jp::after{content:attr(data-romaji); position:absolute; left:50%; bottom:120%; transform:translateX(-50%); background:rgba(0,0,0,.85); color:#fff; font-size:12px; padding:4px 8px; border-radius:6px; white-space:nowrap; opacity:0; pointer-events:none; transition:opacity .15s ease}
.jp::before{content:""; position:absolute; left:50%; bottom:110%; transform:translateX(-50%); border:6px solid transparent; border-top-color:rgba(0,0,0,.85); opacity:0; transition:opacity .15s ease}
.jp:hover::after,.jp:focus::after,.jp:hover::before,.jp:focus::before{opacity:1}

.byline{display:inline-flex;align-items:center;gap:6px;margin-left:10px;padding:4px 15px 4px 0px;border-radius:999px;border:0px solid var(--stroke);font-size:12px;color:var(--muted);text-decoration:none;line-height:1}

.site-footer{max-width:1080px;margin:0 auto;padding:84px 24px 28px;color:var(--muted);font-size:13px;text-align:center}
.site-footer nav{display:flex;justify-content:center;gap:18px;flex-wrap:wrap;margin-bottom:8px}
.footer-link{text-decoration:underline;text-decoration-color:rgba(151,161,179,.5);text-underline-offset:3px}
.content-page{max-width:760px;margin:40px auto;padding:28px;background:var(--panel);border:1px solid var(--stroke);border-radius:var(--radius);box-shadow:var(--shadow)}
.content-page h1{margin-top:0;line-height:1.2}
.content-page h2{margin-top:28px}
.content-page p,.content-page li{color:var(--text)}
.content-page a{text-decoration:underline;text-underline-offset:3px}
.page-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}
.visually-hidden{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}

@media (max-width: 600px){
  .hdr{align-items:flex-start}
  .brand-title-row{gap:8px}
  .support-link{padding:7px 9px}
}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
}