/* Blindfold Training (/resources/blindfold/) */
.bf-eyebrow { letter-spacing: .14em; font-size: .75rem; font-weight: 700; text-transform: uppercase; color: #4f46e5; }
.bf-why { background: #fff; border-radius: .9rem; box-shadow: 0 1px 3px rgba(0,0,0,.08); padding: 1.4rem; }
.bf-why i { font-size: 1.5rem; color: #6366f1; margin-bottom: .6rem; }
.bf-why h2 { font-weight: 700; font-size: 1.1rem; color: #111827; margin-bottom: .35rem; }
.bf-why p { font-size: .9rem; color: #4b5563; line-height: 1.55; }

/* drill picker */
.bf-picker { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: .9rem; }
.bf-pick { position: relative; text-align: left; background: #fff; border: 2px solid transparent; border-radius: .9rem; padding: 1.1rem 1rem 1rem; box-shadow: 0 1px 3px rgba(0,0,0,.08); transition: transform .15s, border-color .15s, box-shadow .15s; display: flex; flex-direction: column; gap: .2rem; }
.bf-pick:hover { transform: translateY(-2px); box-shadow: 0 8px 18px rgba(79,70,229,.12); }
.bf-pick[aria-selected="true"] { border-color: #4f46e5; box-shadow: 0 8px 22px rgba(79,70,229,.18); }
.bf-pick i { font-size: 1.4rem; color: #4f46e5; margin-bottom: .35rem; }
.bf-pick b { color: #111827; font-size: .98rem; }
.bf-pick span:not(.bf-num) { color: #6b7280; font-size: .82rem; line-height: 1.4; }
.bf-num { position: absolute; top: .7rem; right: .8rem; width: 1.5rem; height: 1.5rem; border-radius: 50%; background: #eef2ff; color: #4338ca; font-size: .75rem; font-weight: 700; display: grid; place-items: center; }
@media (max-width: 1023px) { .bf-picker { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
@media (max-width: 639px) {
  .bf-picker { grid-template-columns: 1fr 1fr; gap: .6rem; }
  .bf-pick { padding: .8rem .75rem; }
  .bf-pick span:not(.bf-num) { display: none; }
  .bf-pick:last-child { grid-column: span 2; }
}

/* panel */
.bf-panel { background: #fff; border-radius: 1rem; box-shadow: 0 10px 30px -12px rgba(30,27,75,.25); padding: 1.5rem; scroll-margin-top: calc(var(--cd-header-h, 76px) + 12px); }
.bf-toolbar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: .8rem; padding-bottom: 1rem; border-bottom: 1px solid #eef0f4; margin-bottom: 1.2rem; }
.bf-levels { display: flex; align-items: center; gap: .4rem; font-size: .9rem; color: #4b5563; font-weight: 600; }
.bf-levels button { border: 1px solid #c7d2fe; color: #4338ca; border-radius: 999px; padding: .35rem .95rem; font-weight: 600; background: #fff; }
.bf-levels button[aria-pressed="true"] { background: #4f46e5; color: #fff; border-color: #4f46e5; }
.bf-voice { display: inline-flex; align-items: center; gap: .45rem; font-size: .9rem; color: #374151; cursor: pointer; font-weight: 500; }
.bf-voice input { accent-color: #4f46e5; width: 1rem; height: 1rem; }
.bf-head h3 { font-size: 1.5rem; font-weight: 800; color: #111827; margin-bottom: .3rem; }
.bf-head p { color: #4b5563; max-width: 52rem; line-height: 1.6; }
.bf-head { margin-bottom: 1.3rem; }
kbd { font-family: inherit; font-size: .8em; font-weight: 700; border: 1px solid #d1d5db; border-bottom-width: 2px; border-radius: .3rem; padding: 0 .35rem; background: #f9fafb; }

.bf-stage.bf-center { max-width: 34rem; margin: 0 auto; text-align: center; }
.bf-split { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: 2rem; align-items: start; }
@media (max-width: 860px) { .bf-split { grid-template-columns: minmax(0, 1fr); gap: 1.2rem; } }
@media (max-width: 639px) { .bf-panel { padding: 1rem; border-radius: .8rem; } .bf-score-row > div { min-width: 0; flex: 1; padding: .45rem .5rem; } .bf-big { font-size: 1.35rem; } }
.bf-board-col { position: relative; max-width: 520px; width: 100%; margin: 0 auto; }
.bf-board { display: block; width: 100%; --light-color: #eef0fb; --dark-color: #8b93d6; cursor: pointer; }
.bf-board::part(square), .bf-board::part(piece), .bf-board::part(notation) { cursor: pointer; }
.bf-timer { height: 6px; background: #eef2ff; border-radius: 999px; overflow: hidden; margin-bottom: .5rem; }
.bf-timer span { display: block; height: 100%; width: 0; background: linear-gradient(90deg, #f59e0b, #4f46e5); border-radius: 999px; }
.bf-hidden-board { position: absolute; inset: 14px 0 0 0; aspect-ratio: 1 / 1; z-index: 3; border-radius: .4rem; background: repeating-linear-gradient(45deg, #312e81, #312e81 14px, #3730a3 14px, #3730a3 28px); color: #e0e7ff; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: .6rem; font-weight: 700; text-align: center; }
.bf-hidden-board i { font-size: 2.6rem; color: #fbbf24; }

.bf-score-row { display: flex; gap: .8rem; justify-content: center; margin-bottom: 1rem; }
.bf-split .bf-score-row { justify-content: flex-start; }
.bf-score-row > div { background: #eef2ff; border-radius: .6rem; padding: .5rem .9rem; min-width: 5.5rem; text-align: center; }
.bf-label { font-size: .7rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: #6366f1; }
.bf-big { font-size: 1.6rem; font-weight: 800; color: #1e1b4b; line-height: 1.2; font-variant-numeric: tabular-nums; }
.bf-best { color: #b45309; }
.bf-square { font-size: 5rem; font-weight: 800; color: #1e1b4b; line-height: 1.1; margin: .6rem 0 1.2rem; letter-spacing: .02em; }
@media (max-width: 639px) { .bf-square { font-size: 4rem; } }
.bf-flash-ok { animation: bfOk .35s; } .bf-flash-no { animation: bfNo .35s; }
@keyframes bfOk { 0% { color: #16a34a; transform: scale(1.06); } 100% { color: #1e1b4b; transform: none; } }
@keyframes bfNo { 0%, 100% { transform: none; } 25% { transform: translateX(-8px); color: #dc2626; } 75% { transform: translateX(8px); color: #dc2626; } }
.bf-question { font-size: 1.12rem; color: #111827; line-height: 1.55; margin: .4rem 0 1rem; min-height: 1.6em; }
.bf-qn { display: block; font-size: .72rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: #6366f1; margin-bottom: .2rem; }
.bf-answers { display: flex; flex-wrap: wrap; gap: .6rem; justify-content: center; }
.bf-answers.bf-col { justify-content: flex-start; }
.bf-ans { border: 2px solid #c7d2fe; background: #fff; color: #312e81; font-weight: 700; border-radius: .6rem; padding: .65rem 1.2rem; min-width: 5rem; transition: background .15s, border-color .15s; }
.bf-ans:hover:not(:disabled) { border-color: #4f46e5; background: #eef2ff; }
.bf-ans:disabled { cursor: default; opacity: .85; }
.bf-ans.is-right { background: #dcfce7; border-color: #16a34a; color: #14532d; opacity: 1; }
.bf-ans.is-wrong { background: #fee2e2; border-color: #dc2626; color: #7f1d1d; opacity: 1; }
.bf-lr .bf-ans { flex: 1; font-size: 1.3rem; padding: 1.1rem; }
.bf-light { background: #f5f0e6 !important; border-color: #d6c7a8 !important; color: #3f3420 !important; }
.bf-dark { background: #5b4a3a !important; border-color: #3f3226 !important; color: #fff !important; }
.bf-lr .bf-ans:disabled { opacity: .45; }
.bf-numans { min-width: 3.4rem; font-size: 1.15rem; }
.bf-next { flex-basis: 100%; margin-top: .4rem; background: #4f46e5; color: #fff; font-weight: 700; border-radius: .6rem; padding: .65rem 1rem; }
.bf-next:hover { background: #4338ca; }
.bf-col .bf-next { flex-basis: auto; }
.bf-hint { color: #4338ca; font-weight: 600; background: #eef2ff; border-radius: .5rem; padding: .55rem .9rem; }
.bf-msg { min-height: 1.5em; margin: .9rem 0; color: #374151; line-height: 1.5; }
.bf-msg a { color: #4338ca; font-weight: 600; text-decoration: underline; }
.bf-ok { color: #15803d; } .bf-no { color: #b91c1c; }
.bf-start { display: inline-flex; align-items: center; gap: .5rem; background: #f97316; color: #fff; font-weight: 700; border-radius: .6rem; padding: .75rem 1.5rem; box-shadow: 0 6px 14px -6px rgba(249,115,22,.7); }
.bf-start:hover { background: #ea580c; }
.bf-ghost { display: inline-flex; align-items: center; gap: .45rem; border: 1px solid #d1d5db; color: #374151; background: #fff; font-weight: 600; border-radius: .6rem; padding: .65rem 1rem; }
.bf-ghost:hover:not(:disabled) { border-color: #6366f1; color: #4338ca; }
.bf-ghost:disabled { opacity: .5; }
.bf-row { display: flex; flex-wrap: wrap; gap: .6rem; align-items: center; }
.bf-auto { display: inline-flex; align-items: center; gap: .4rem; font-size: .9rem; color: #4b5563; cursor: pointer; }
.bf-auto input { accent-color: #4f46e5; }
.bf-movelist { font-size: 1.05rem; line-height: 1.8; color: #374151; min-height: 1.8em; font-variant-numeric: tabular-nums; }
.bf-movelist b { color: #6b7280; font-weight: 600; }
.bf-last { background: #fef3c7; color: #78350f; font-weight: 800; border-radius: .3rem; padding: .05rem .35rem; }
.bf-type { display: flex; gap: .5rem; margin: .4rem 0; max-width: 22rem; }
.bf-type input { flex: 1; min-width: 0; border: 2px solid #c7d2fe; border-radius: .6rem; padding: .6rem .8rem; font-size: 1rem; font-weight: 600; }
.bf-type input:focus { outline: none; border-color: #4f46e5; }
.bf-type button { background: #4f46e5; color: #fff; font-weight: 700; border-radius: .6rem; padding: .6rem 1.1rem; }
.bf-credit { font-size: .78rem; color: #9ca3af; margin-top: 1.2rem; }
.bf-credit a { text-decoration: underline; }
.bf-tips { display: grid; gap: .8rem; }
.bf-tips li { background: #f9fafb; border-left: 4px solid #6366f1; border-radius: .5rem; padding: .8rem 1rem; color: #374151; line-height: 1.55; }

/* dark mode */
html.dark .bf-why, html.dark .bf-pick, html.dark .bf-panel { background: #162032; box-shadow: none; }
html.dark .bf-why h2, html.dark .bf-pick b, html.dark .bf-head h3, html.dark .bf-question { color: #f1f5f9; }
html.dark .bf-why p, html.dark .bf-pick span:not(.bf-num), html.dark .bf-head p, html.dark .bf-msg, html.dark .bf-movelist, html.dark .bf-voice, html.dark .bf-levels, html.dark .bf-auto { color: #a8b3c4; }
html.dark .bf-pick[aria-selected="true"] { border-color: #818cf8; }
html.dark .bf-toolbar { border-color: #273449; }
html.dark .bf-levels button, html.dark .bf-ans, html.dark .bf-ghost { background: #0f172a; border-color: #334155; color: #c7d2fe; }
html.dark .bf-levels button[aria-pressed="true"] { background: #4f46e5; border-color: #4f46e5; color: #fff; }
html.dark .bf-score-row > div, html.dark .bf-num, html.dark .bf-hint, html.dark .bf-timer { background: #1e293b; }
html.dark .bf-big, html.dark .bf-square { color: #e0e7ff; }
html.dark .bf-best { color: #fbbf24; }
html.dark .bf-ans.is-right { background: #14532d; border-color: #22c55e; color: #dcfce7; }
html.dark .bf-ans.is-wrong { background: #7f1d1d; border-color: #ef4444; color: #fee2e2; }
html.dark .bf-type input { background: #0f172a; border-color: #334155; color: #f1f5f9; }
html.dark .bf-tips li { background: #162032; color: #cbd5e1; }
html.dark .bf-hint { color: #c7d2fe; }
html.dark kbd { background: #1e293b; border-color: #334155; }
html.dark .bf-ok { color: #4ade80; } html.dark .bf-no { color: #f87171; }
html.dark .bf-last { background: #78350f; color: #fef3c7; }
@keyframes bfOkDark { 0% { color: #4ade80; } 100% { color: #e0e7ff; } }
html.dark .bf-flash-ok { animation: bfOkDark .35s; }
/* buttons and boxes above set their own display, so make the "hidden" helper win inside the trainer */
.bf-panel .hidden { display: none !important; }
.bf-tool-right { display: flex; flex-wrap: wrap; align-items: center; gap: .4rem 1.2rem; }
.bf-acct { font-size: .85rem; color: #6b7280; }
.bf-acct i { color: #16a34a; } .bf-acct .fa-user-circle { color: #6366f1; }
.bf-acct a { color: #4338ca; font-weight: 600; text-decoration: underline; }
html.dark .bf-acct { color: #a8b3c4; } html.dark .bf-acct a { color: #a5b4fc; }