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

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    touch-action: manipulation;
    scrollbar-color: var(--border-strong) transparent;
}

body {
    margin: 0;
    min-height: 100dvh;
    font-family: var(--font);
    font-size: var(--text-md);
    line-height: var(--leading);
    font-feature-settings: 'ss01', 'kern';
    color: var(--text);
    background: var(--page-glow), var(--bg);
    direction: rtl;
    text-align: right;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

body.is-loading-theme * { transition: none !important; }

h1, h2, h3, h4, p, ul, ol, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }

h1, .h1 { font-size: var(--text-lg); font-weight: 800; line-height: var(--leading-tight); letter-spacing: -.015em; }
h2, .h2 { font-size: var(--text-md); font-weight: 700; line-height: var(--leading-tight); }
h3, .h3 { font-size: var(--text-sm); font-weight: 600; line-height: var(--leading-tight); color: var(--text-2); }

small, .text-sm { font-size: var(--text-sm); }
.text-md { font-size: var(--text-md); }
.text-lg { font-size: var(--text-lg); }

strong, b { font-weight: 700; }
.fw-500 { font-weight: 500; }
.fw-600 { font-weight: 600; }
.fw-700 { font-weight: 700; }

.muted   { color: var(--text-2); }
.muted-2 { color: var(--text-3); }
.num     { font-variant-numeric: tabular-nums; }
.ltr     { direction: ltr; unicode-bidi: isolate; }
.ellipsis { overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.nowrap  { white-space: nowrap; }
.text-center { text-align: center; }

a { color: var(--accent); text-decoration: none; transition: color var(--dur-1); }
a:hover { color: color-mix(in srgb, var(--accent) 80%, var(--text)); }
a:not([class]):hover { text-decoration: underline; text-underline-offset: 3px; }

img, svg, video { display: block; max-width: 100%; }
svg { flex-shrink: 0; }
.icon { width: 1.2em; height: 1.2em; }

button, input, select, textarea {
    font: inherit;
    color: inherit;
    letter-spacing: inherit;
}

button { cursor: pointer; background: none; border: 0; padding: 0; }
button:disabled { cursor: not-allowed; }

::selection { background: var(--accent-soft); color: var(--text); }

:focus { outline: none; }
:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    border-radius: var(--r-sm);
}

[hidden] { display: none !important; }
.sr-only {
    position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0;
    overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb { background: var(--border-strong); border: 3px solid transparent; border-radius: 8px; background-clip: padding-box; }
::-webkit-scrollbar-thumb:hover { background: var(--text-3); background-clip: padding-box; border: 3px solid transparent; }
::-webkit-scrollbar-track { background: transparent; }

.row   { display: flex; align-items: center; gap: var(--s-3); }
.row-between { display: flex; align-items: center; justify-content: space-between; gap: var(--s-3); }
.stack { display: flex; flex-direction: column; gap: var(--s-3); }
.wrap  { flex-wrap: wrap; }
.grow  { flex: 1 1 auto; min-width: 0; }
.gap-1 { gap: var(--s-1); } .gap-2 { gap: var(--s-2); } .gap-4 { gap: var(--s-4); } .gap-6 { gap: var(--s-6); }
.mt-2 { margin-top: var(--s-2); } .mt-4 { margin-top: var(--s-4); } .mt-6 { margin-top: var(--s-6); } .mt-8 { margin-top: var(--s-8); }
.mb-2 { margin-bottom: var(--s-2); } .mb-4 { margin-bottom: var(--s-4); } .mb-6 { margin-bottom: var(--s-6); }

.grid { display: grid; gap: var(--s-4); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid .span-2 { grid-column: span 2; }

@media (max-width: 900px) {
    .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 560px) {
    .grid { gap: var(--s-3); }
    .grid-2, .grid-3, .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .grid .span-2, .grid .span-2-sm, .grid-3 > :last-child:nth-child(odd) { grid-column: 1 / -1; }

    .modal .grid-2:not(.keep-pair) { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 640px) {
    .btn-pair, .page-actions, .modal-footer, .section-foot, .card-header > .row {
        display: grid !important; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--s-2);
    }
    .btn-pair > .btn, .page-actions > .btn, .modal-footer > .btn, .section-foot > .btn, .card-header > .row > .btn { width: 100%; justify-content: center; margin: 0; }
    .modal-footer > .btn:only-child, .page-actions > .btn:only-child, .btn-pair > .btn:only-child { grid-column: 1 / -1; }
}

.divider { height: 1px; background: var(--border); border: 0; margin: var(--s-4) 0; }

@keyframes fade-in   { from { opacity: 0; } to { opacity: 1; } }
@keyframes rise-in   { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
@keyframes pop-in    { from { opacity: 0; transform: scale(.96); } to { opacity: 1; transform: none; } }
@keyframes spin      { to { transform: rotate(360deg); } }
@keyframes shimmer   { from { background-position: 200% 0; } to { background-position: -200% 0; } }

.fade-in { animation: fade-in var(--dur-2) var(--ease) both; }
.rise-in { animation: rise-in var(--dur-3) var(--ease) both; }

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { animation-duration: 1ms !important; transition-duration: 1ms !important; }
}

.ltr, [dir="ltr"], .latin, .code-input, .access-code-value, .exercise-en, .kbd { font-feature-settings: 'kern'; }