/* ABENTERPIRESS — chessboard
   cream and green squares, ink pieces, last-move yellow */

:root {
  --sq1: #e2eef4; --sq2: #818ab7; --sq2deep: #535ea4; --ink: #1f2420; --ink2: #2b322b;
  --hi: #7de7f7; --check: #1f8a42; --mute: #586056;
}

html { scroll-behavior: auto; }
body { overflow-x: hidden; }
main > section, footer { overflow-x: clip; }

.skip-link { position: absolute; left: -999px; top: 8px; z-index: 100; background: var(--hi); color: var(--ink); padding: 8px 14px; font-weight: 700; }
.skip-link:focus { left: 8px; }

.piece { font-family: "Segoe UI Symbol", "Noto Sans Symbols 2", "Apple Symbols", "DejaVu Sans", sans-serif; font-variant-emoji: text; }

/* checker patterns */
.checker { background-color: var(--sq1); background-image: conic-gradient(var(--sq2) 25%, transparent 0 50%, var(--sq2) 0 75%, transparent 0); background-size: 64px 64px; }
.checker-sm { background-color: var(--sq1); background-image: conic-gradient(var(--sq2) 25%, transparent 0 50%, var(--sq2) 0 75%, transparent 0); background-size: 28px 28px; }
.checker-ink { background-color: var(--ink); background-image: conic-gradient(var(--ink2) 25%, transparent 0 50%, var(--ink2) 0 75%, transparent 0); background-size: 56px 56px; }
.strip { height: 28px; }

/* board */
.board { display: grid; grid-template-columns: repeat(8, 1fr); border: 8px solid var(--ink); box-shadow: 10px 10px 0 var(--ink); aspect-ratio: 1; }
.sqr { position: relative; display: grid; place-items: center; font-size: clamp(22px, 5vw, 48px); line-height: 1; }
.sqr--l { background: var(--sq1); } .sqr--d { background: var(--sq2); }
.sqr--hi { background: var(--hi) !important; }
.sqr .w { color: #ffffff; text-shadow: 0 0 0 #000000, 1px 1px 0 #1f2420, -1px -1px 0 #1f2420, 1px -1px 0 #1f2420, -1px 1px 0 #1f2420; }
.sqr .k { color: var(--ink); }
.coord { position: absolute; font-size: 10px; font-weight: 800; opacity: .7; }
.pulse-sq { animation: pulse 2.4s ease-in-out infinite; }
@keyframes pulse { 0%,100% { filter: none; } 50% { filter: brightness(1.12); } }

.eyebrow { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; font-size: 13px; letter-spacing: .16em; text-transform: uppercase; }
.eyebrow b { display: grid; place-items: center; width: 28px; height: 28px; background: var(--ink); color: var(--hi); font-weight: 800; font-size: 13px; letter-spacing: 0; }

/* ---------- buttons ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 10px; white-space: nowrap; font-weight: 800; font-size: 16px; letter-spacing: .04em; padding: 15px 28px; border: 3px solid var(--ink); cursor: pointer; transition: transform .15s, box-shadow .15s, background .15s; box-shadow: 5px 5px 0 var(--ink); }
.btn:hover { transform: translate(-2px, -2px); box-shadow: 7px 7px 0 var(--ink); }
.btn:active { transform: translate(3px, 3px); box-shadow: 1px 1px 0 var(--ink); }
.btn--green { background: var(--sq2); color: #ffffff; }
.btn--ink { background: var(--ink); color: var(--hi); box-shadow: 5px 5px 0 var(--sq2); }
.btn--ink:hover { box-shadow: 7px 7px 0 var(--sq2); }
.btn--hi { background: var(--hi); color: var(--ink); }
.btn--white { background: var(--sq1); color: var(--ink); }
.btn--sm { padding: 8px 16px; font-size: 14px; box-shadow: 3px 3px 0 var(--ink); }
.btn__arrow { width: 16px; height: 10px; position: relative; display: inline-block; transition: transform .2s; }
.btn__arrow::before { content: ""; position: absolute; left: 0; right: 1px; top: 50%; height: 3px; background: currentColor; transform: translateY(-50%); }
.btn__arrow::after { content: ""; position: absolute; right: 1px; top: 50%; width: 8px; height: 8px; border-top: 3px solid currentColor; border-right: 3px solid currentColor; transform: translateY(-50%) rotate(45deg); }
.btn:hover .btn__arrow { transform: translateX(3px); }

.nl { font-weight: 700; font-size: 15px; padding: 6px 2px; position: relative; color: var(--sq1); }
.nl::after { content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 4px; background: var(--hi); transform: scaleX(0); transform-origin: left; transition: transform .2s; }
.nl:hover::after { transform: scaleX(1); }

/* ---------- cards ---------- */
.card { background: #ffffff; border: 3px solid var(--ink); box-shadow: 8px 8px 0 var(--ink); position: relative; transition: transform .25s, box-shadow .25s; }
.card:hover { transform: translate(-3px, -3px); box-shadow: 11px 11px 0 var(--sq2); }
.card--dark { background: var(--ink); color: var(--sq1); box-shadow: 8px 8px 0 var(--sq2); }
.tag { display: inline-block; font-weight: 700; font-size: 13px; padding: 3px 10px; border: 2px solid currentColor; }
.glyph { display: grid; place-items: center; width: 84px; height: 84px; font-size: 56px; line-height: 1; color: var(--ink); }
.glyph--l { background: var(--sq1); } .glyph--d { background: var(--sq2); }

/* ---------- FAQ ---------- */
.faq-item { border: 3px solid var(--ink); background: var(--sq1); }
.faq-item + .faq-item { margin-top: -3px; }
.faq-trigger { width: 100%; display: flex; align-items: center; gap: 16px; text-align: left; padding: 18px 22px; cursor: pointer; }
.faq-x { margin-left: auto; position: relative; width: 34px; height: 34px; flex: none; border: 3px solid var(--ink); background: var(--sq2); transition: background .2s; }
.faq-x::before, .faq-x::after { content: ""; position: absolute; left: 50%; top: 50%; background: var(--ink); transform: translate(-50%, -50%); }
.faq-x::before { width: 14px; height: 3px; } .faq-x::after { width: 3px; height: 14px; transition: transform .25s; }
.faq-item[data-state="open"] { background: #ffffff; }
.faq-item[data-state="open"] .faq-x { background: var(--hi); }
.faq-item[data-state="open"] .faq-x::after { transform: translate(-50%, -50%) rotate(90deg); }
.faq-body { display: grid; grid-template-rows: 0fr; transition: grid-template-rows .35s ease; }
.faq-body > * { overflow: hidden; min-height: 0; }
.faq-item[data-state="open"] .faq-body { grid-template-rows: 1fr; }

/* ---------- form ---------- */
.fieldbox { display: block; border: 3px solid var(--ink); background: #ffffff; padding: 8px 14px 5px; transition: box-shadow .15s, background .15s; }
.fieldbox:focus-within { background: #f1fcff; box-shadow: 4px 4px 0 var(--ink); }
.lbl { display: block; font-weight: 800; font-size: 11.5px; letter-spacing: .14em; text-transform: uppercase; color: var(--sq2deep); }
.field { width: 100%; background: transparent; border: 0; outline: 0; font-size: 16.5px; font-weight: 500; padding: 4px 0; color: var(--ink); font-family: Plus Jakarta Sans, sans-serif; }
select.field { appearance: none; -webkit-appearance: none; cursor: pointer; }
.fieldbox--sel { position: relative; }
.fieldbox--sel::after { content: ""; position: absolute; right: 16px; bottom: 19px; width: 8px; height: 8px; border-right: 3px solid var(--ink); border-bottom: 3px solid var(--ink); transform: rotate(45deg); pointer-events: none; }

/* ---------- reveal ---------- */
[data-reveal] { opacity: 0; transform: translateY(22px); transition: opacity .55s ease, transform .55s cubic-bezier(.2,.8,.2,1); transition-delay: var(--reveal-delay, 0ms); }
[data-reveal].is-visible { opacity: 1; transform: none; }
.card[data-reveal].is-visible { transition: opacity .55s ease var(--reveal-delay, 0ms), transform .25s, box-shadow .25s; }

/* ---------- toast ---------- */
.toast { position: fixed; left: 50%; bottom: 28px; z-index: 90; transform: translate(-50%, 30px); opacity: 0; pointer-events: none; background: var(--ink); color: var(--sq1); border: 3px solid var(--hi); padding: 13px 22px; font-weight: 700; font-size: 15px; max-width: calc(100vw - 32px); transition: opacity .3s, transform .3s; }
.toast.is-shown { opacity: 1; transform: translate(-50%, 0); }
.toast__msg::before { content: "♞ "; color: var(--hi); }

@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; transition: none; }
  .pulse-sq { animation: none; }
}