/* rules-sheet.css — the in-game "How to play" sheet (rulesSheet.js). Everything here is scoped
   to #rules-sheet / .rs-*; the palette tokens come from style.css :root, with the same values as
   fallbacks so the sheet still reads if it is ever opened before (or without) that sheet. */

#rules-sheet {
    --rs-bg-1: var(--esp-800, #22140c);
    --rs-bg-2: var(--esp-900, #170d08);
    --rs-bg-3: var(--esp-950, #0e0805);
    --rs-ink: var(--cream, #f3e9d6);
    --rs-ink-soft: rgba(243, 233, 214, 0.78);
    --rs-gold: var(--saffron, #e0a83a);
    --rs-brass: var(--brass, #b98a3a);
    --rs-line: var(--line, rgba(217, 164, 65, 0.35));
    --rs-kilim: var(--kilim, #8e2430);
    --rs-kilim-deep: var(--kilim-deep, #5a1119);
    --rs-indigo: var(--indigo, #24345e);
    --rs-gutter: 16px;

    position: fixed; inset: 0; z-index: 950;
    display: flex; flex-direction: column;
    color: var(--rs-ink);
    font: 400 16px/1.6 "Work Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
    font-kerning: normal;
    -webkit-text-size-adjust: 100%;
    opacity: 0; transform: translateY(14px);
    transition: opacity 200ms cubic-bezier(.2, .7, .2, 1), transform 220ms cubic-bezier(.2, .7, .2, 1);
}
#rules-sheet[hidden] { display: none; }
#rules-sheet.rs-open { opacity: 1; transform: none; }
#rules-sheet.rs-closing { opacity: 0; transform: translateY(8px);
    transition-duration: 180ms, 180ms; transition-timing-function: ease-in, ease-in; }
@media (prefers-reduced-motion: reduce) {
    #rules-sheet, #rules-sheet.rs-closing { transition: none; transform: none; }
}

#rules-sheet ::selection { background: var(--rs-kilim); color: var(--rs-ink); }

#rules-sheet .rs-panel {
    flex: 1; min-height: 0; display: flex; flex-direction: column;
    background:
        radial-gradient(120% 70% at 50% 0%, rgba(224, 168, 58, 0.07), transparent 60%),
        linear-gradient(180deg, var(--rs-bg-1) 0%, var(--rs-bg-2) 38%, var(--rs-bg-3) 100%);
}

/* ── header ─────────────────────────────────────────────────────────────────── */
#rules-sheet .rs-head {
    flex: none; display: flex; align-items: center; gap: 12px;
    /* the title and the close button line up with the 720px text column on wide screens */
    padding: max(6px, env(safe-area-inset-top))
             max(var(--rs-gutter), env(safe-area-inset-right), calc((100% - 720px) / 2))
             6px
             max(var(--rs-gutter), env(safe-area-inset-left), calc((100% - 720px) / 2));
    background: var(--rs-bg-3);
}
#rules-sheet .rs-title {
    flex: 1; min-width: 0; margin: 0;
    font: 700 clamp(20px, 2.4vw + 10px, 28px)/1.2 "Playfair Display", Georgia, serif;
    color: var(--rs-gold); letter-spacing: 0.01em;
    overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
#rules-sheet .rs-close {
    flex: none; width: 44px; height: 44px; margin-right: -6px;
    display: grid; place-items: center; padding: 0;
    border: 1px solid var(--rs-line); border-radius: 50%;
    background: rgba(243, 233, 214, 0.04); color: var(--rs-ink);
    cursor: pointer; -webkit-tap-highlight-color: transparent;
    transition: background-color 140ms ease-out, border-color 140ms ease-out, color 140ms ease-out;
}
#rules-sheet .rs-close:hover { background: rgba(224, 168, 58, 0.14); border-color: var(--rs-gold); color: var(--rs-gold); }
#rules-sheet .rs-close:active { background: rgba(224, 168, 58, 0.22); }
#rules-sheet :focus-visible { outline: 2px solid var(--rs-gold); outline-offset: 2px; }
#rules-sheet .rs-h:focus { outline: none; }

#rules-sheet .rs-band {
    flex: none; height: 11px;
    background: var(--rs-kilim-deep) url("art/kilim-band.svg") repeat-x center / auto 100%;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.45);
    position: relative; z-index: 1;
}

/* ── scrolling body ─────────────────────────────────────────────────────────── */
#rules-sheet .rs-scroll {
    flex: 1; min-height: 0; overflow-y: auto; overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin; scrollbar-color: var(--rs-brass) transparent;
    padding: 0 max(var(--rs-gutter), env(safe-area-inset-right))
             max(28px, calc(env(safe-area-inset-bottom) + 20px))
             max(var(--rs-gutter), env(safe-area-inset-left));
}
#rules-sheet .rs-scroll::-webkit-scrollbar { width: 8px; }
#rules-sheet .rs-scroll::-webkit-scrollbar-track { background: transparent; }
#rules-sheet .rs-scroll::-webkit-scrollbar-thumb { background: rgba(185, 138, 58, 0.55); border-radius: 4px; }
#rules-sheet .rs-scroll::-webkit-scrollbar-thumb:hover { background: var(--rs-brass); }

#rules-sheet .rs-col { max-width: 720px; margin: 0 auto; }

/* chapter chips — wrap on wide screens, a single swipeable row on short ones */
#rules-sheet .rs-nav {
    display: flex; flex-wrap: wrap; gap: 8px;
    padding: 18px 0 6px;
}
#rules-sheet .rs-chip {
    min-height: 36px; padding: 6px 14px;
    border: 1px solid var(--rs-line); border-radius: 999px;
    background: rgba(243, 233, 214, 0.04); color: var(--rs-ink-soft);
    font: 500 14px/1.2 "Work Sans", system-ui, sans-serif; white-space: nowrap;
    cursor: pointer; -webkit-tap-highlight-color: transparent;
    transition: background-color 140ms ease-out, border-color 140ms ease-out, color 140ms ease-out;
}
#rules-sheet .rs-chip:hover { border-color: var(--rs-gold); color: var(--rs-ink); background: rgba(224, 168, 58, 0.1); }
#rules-sheet .rs-chip:active { background: rgba(224, 168, 58, 0.2); }

/* ── chapters ───────────────────────────────────────────────────────────────── */
#rules-sheet .rs-chapter { scroll-margin-top: 12px; padding-top: 6px; }
#rules-sheet .rs-h {
    margin: 26px 0 10px; padding-bottom: 8px;
    font: 700 clamp(20px, 1.2vw + 15px, 24px)/1.25 "Playfair Display", Georgia, serif;
    color: var(--rs-gold);
    border-bottom: 1px solid var(--rs-line);
}
#rules-sheet p { margin: 0 0 12px; max-width: 68ch; }
#rules-sheet strong { color: #ffe3a6; font-weight: 600; }
#rules-sheet .rs-note { color: var(--rs-ink-soft); font-size: 15px; }

/* tables — brass hairlines, tabular figures */
#rules-sheet .rs-table {
    width: 100%; max-width: 480px; margin: 4px 0 14px;
    border-collapse: collapse; font-size: 15px;
    font-variant-numeric: tabular-nums lining-nums;
}
#rules-sheet .rs-table th {
    text-align: left; padding: 6px 12px 8px 0;
    font: 600 13px/1.3 "Work Sans", system-ui, sans-serif; letter-spacing: 0.04em;
    color: var(--rs-brass); border-bottom: 1px solid var(--rs-brass);
}
#rules-sheet .rs-table td {
    padding: 8px 12px 8px 0; vertical-align: top;
    border-bottom: 1px solid rgba(185, 138, 58, 0.22);
}
#rules-sheet .rs-table th:last-child,
#rules-sheet .rs-table td:last-child { padding-right: 0; }
#rules-sheet .rs-table td:first-child { color: var(--rs-ink); }
#rules-sheet .rs-table td:last-child { color: #ffe3a6; }

/* ── worked example: K takes A+3 and 6+8 ────────────────────────────────────── */
#rules-sheet .rs-example {
    --card-w: clamp(46px, 3vw + 34px, 62px);
    margin: 6px 0 16px; padding: 16px 14px 12px;
    border: 1px solid var(--rs-line); border-radius: 12px;
    background:
        radial-gradient(ellipse 80% 90% at 50% 35%, rgba(255, 196, 120, 0.10), transparent 70%),
        linear-gradient(180deg, #3a1a15, #241009);   /* the same cloth the game is played on */
    box-shadow: inset 0 1px 0 rgba(243, 233, 214, 0.05);
}
#rules-sheet .rs-ex-row {
    display: flex; flex-wrap: wrap; align-items: center; justify-content: center;
    gap: 12px 14px;
}
#rules-sheet .rs-ex-played,
#rules-sheet .rs-ex-group { display: flex; flex-direction: column; align-items: center; gap: 7px; }
#rules-sheet .rs-ex-played .rs-card { box-shadow: 0 0 0 2px var(--rs-gold), 0 4px 10px rgba(0, 0, 0, 0.5); }
#rules-sheet .rs-ex-groups { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; }
#rules-sheet .rs-ex-cards {
    display: flex; gap: 5px; padding: 6px;
    border: 1px dashed rgba(224, 168, 58, 0.55); border-radius: 10px;
}
#rules-sheet .rs-card { flex: none; pointer-events: none; transition: none; }
#rules-sheet .rs-ex-label {
    font-size: 13px; line-height: 1.2; color: var(--rs-ink-soft); white-space: nowrap;
    font-variant-numeric: tabular-nums lining-nums;
}
#rules-sheet .rs-ex-arrow { color: var(--rs-gold); display: flex; padding-bottom: 20px; }
#rules-sheet .rs-ex-caption {
    margin: 12px auto 0; max-width: 52ch; text-align: center;
    font-size: 14px; line-height: 1.5; color: var(--rs-ink-soft);
}

/* ── credits ────────────────────────────────────────────────────────────────── */
#rules-sheet .rs-credits {
    margin-top: 32px; padding-top: 14px;
    border-top: 1px solid var(--rs-line);
    font-size: 14px; color: var(--rs-ink-soft);
}
#rules-sheet .rs-credits p { margin: 0 0 4px; }

/* ── short landscape phones (812x375, 640x300) ─────────────────────────────── */
@media (max-height: 460px) {
    #rules-sheet { font-size: 15px; line-height: 1.55; }
    #rules-sheet .rs-head { padding-top: max(2px, env(safe-area-inset-top)); padding-bottom: 2px; }
    #rules-sheet .rs-title { font-size: 20px; }
    #rules-sheet .rs-band { height: 10px; }
    #rules-sheet .rs-h { margin-top: 20px; }
    #rules-sheet .rs-example { --card-w: 46px; padding: 12px 10px 10px; }
}

/* the chapter chips become one swipeable row wherever wrapping would eat the screen */
@media (max-height: 460px), (max-width: 600px) {
    #rules-sheet .rs-nav {
        flex-wrap: nowrap; overflow-x: auto; scrollbar-width: none;
        padding-top: 12px; margin: 0 calc(-1 * var(--rs-gutter)); padding-left: var(--rs-gutter); padding-right: var(--rs-gutter);
        -webkit-mask-image: linear-gradient(90deg, transparent 0, #000 var(--rs-gutter), #000 calc(100% - 28px), transparent);
                mask-image: linear-gradient(90deg, transparent 0, #000 var(--rs-gutter), #000 calc(100% - 28px), transparent);
    }
    #rules-sheet .rs-nav::-webkit-scrollbar { display: none; }
}

@media (max-width: 420px) {
    #rules-sheet .rs-example { --card-w: 46px; padding: 14px 8px 10px; }
    #rules-sheet .rs-ex-row { flex-direction: column; gap: 6px; }
    #rules-sheet .rs-ex-arrow { transform: rotate(90deg); padding: 0; margin: 4px 0; }
}

/* a finger needs 44px: the chapter chips grow on touch screens */
@media (pointer: coarse) {
    #rules-sheet .rs-chip { min-height: 44px; }
}