/* Final design layer: loader, form controls, action buttons, guest navigation, icons. */

/* ---------- Loader (crawlable prerender stays in the DOM but is visually hidden) ---------- */
#app > .seo-prerender {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    padding: 0;
    overflow: hidden;
    border: 0;
    clip: rect(0 0 0 0);
    clip-path: inset(50%);
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
}

.app-loading {
    position: fixed;
    inset: 0;
    z-index: 50;
}

.loading-logo-wrap {
    display: grid;
    place-items: center;
    width: 112px;
    height: 112px;
    border-radius: 34px;
    background: rgba(255, 255, 255, .78);
    box-shadow: 0 22px 50px rgba(83, 61, 164, .2), inset 0 1px 0 #fff;
    animation: nsm-loader-glow 2.6s ease-in-out infinite;
}

.loading-logo { width: 78px; height: 78px; object-fit: contain; }

@keyframes nsm-loader-glow {
    0%, 100% { box-shadow: 0 22px 50px rgba(83, 61, 164, .2), 0 0 0 0 rgba(121, 85, 239, .22); }
    50% { box-shadow: 0 26px 56px rgba(83, 61, 164, .26), 0 0 0 16px rgba(121, 85, 239, 0); }
}

:root[data-theme="dark"] .app-loading {
    background: radial-gradient(circle at 50% 35%, #342a4d 0, #221c31 52%, #17131f 100%);
    color: #f4eeff;
}

:root[data-theme="dark"] .app-loading span { color: #c1b7d6; }
:root[data-theme="dark"] .loading-logo-wrap { background: rgba(255, 255, 255, .08); box-shadow: 0 22px 50px rgba(0, 0, 0, .35), inset 0 1px 0 rgba(255, 255, 255, .12); }
:root[data-theme="dark"] .loading-progress { background: #3a3150; }

/* ---------- Checkboxes, radios, switches ---------- */
input[type="checkbox"],
input[type="radio"] {
    -webkit-appearance: none;
    appearance: none;
    display: inline-grid;
    flex: 0 0 auto;
    place-content: center;
    width: 21px;
    height: 21px;
    margin: 0;
    border: 1.5px solid #cdc3e6;
    background: #fff;
    cursor: pointer;
    transition: background-color .18s ease, border-color .18s ease, box-shadow .18s ease, transform .18s ease;
}

input[type="checkbox"] { border-radius: 7px; }
input[type="radio"] { border-radius: 50%; }

input[type="checkbox"]::before,
input[type="radio"]::before {
    content: "";
    transform: scale(0);
    transition: transform .22s cubic-bezier(.34, 1.56, .64, 1);
    background: #fff;
}

input[type="checkbox"]::before {
    width: 11px;
    height: 11px;
    clip-path: polygon(14% 44%, 0 65%, 50% 100%, 100% 16%, 80% 0, 43% 62%);
}

input[type="radio"]::before {
    width: 9px;
    height: 9px;
    border-radius: 50%;
}

input[type="checkbox"]:hover,
input[type="radio"]:hover { border-color: #8f6cf2; box-shadow: 0 0 0 4px rgba(112, 72, 232, .1); }

input[type="checkbox"]:checked,
input[type="radio"]:checked {
    border-color: transparent;
    background: linear-gradient(135deg, #8461f2, #5f3bd2);
    box-shadow: 0 5px 12px rgba(93, 60, 208, .3);
}

input[type="checkbox"]:checked::before,
input[type="radio"]:checked::before { transform: scale(1); }

input[type="checkbox"]:active,
input[type="radio"]:active { transform: scale(.9); }

input[type="checkbox"]:focus-visible,
input[type="radio"]:focus-visible { outline: none; box-shadow: 0 0 0 4px rgba(112, 72, 232, .28); }

input[type="checkbox"]:disabled,
input[type="radio"]:disabled { opacity: .5; cursor: not-allowed; }

.filter-checkbox,
.filter-radio {
    gap: 11px;
    padding: 0 10px;
    cursor: pointer;
    user-select: none;
}

.filter-checkbox span,
.filter-radio span { transition: color .16s ease; }

.filter-checkbox:has(input:checked) span,
.filter-radio:has(input:checked) span { color: #4f2fc0; font-weight: 750; }

.filter-toggle input[type="checkbox"] {
    width: 42px;
    height: 24px;
    border-radius: 999px;
    place-content: center start;
    padding: 0 3px;
}

.filter-toggle input[type="checkbox"]::before {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: #fff;
    clip-path: none;
    transform: translateX(0) scale(1);
    box-shadow: 0 2px 5px rgba(37, 24, 87, .26);
    transition: transform .24s cubic-bezier(.34, 1.4, .64, 1), background-color .18s ease;
}

.filter-toggle input[type="checkbox"]:not(:checked)::before { background: #b9afd0; }
.filter-toggle input[type="checkbox"]:checked::before { transform: translateX(18px) scale(1); }

:root[data-theme="dark"] input[type="checkbox"],
:root[data-theme="dark"] input[type="radio"] { border-color: #5d5178; background: #2a2438; }

:root[data-theme="dark"] input[type="checkbox"]:checked,
:root[data-theme="dark"] input[type="radio"]:checked {
    border-color: transparent;
    background: linear-gradient(135deg, #9a82f7, #7552e6);
    box-shadow: 0 5px 14px rgba(0, 0, 0, .35);
}

:root[data-theme="dark"] input[type="checkbox"]:hover,
:root[data-theme="dark"] input[type="radio"]:hover { border-color: #a58cff; box-shadow: 0 0 0 4px rgba(165, 140, 255, .14); }

:root[data-theme="dark"] .filter-checkbox:has(input:checked) span,
:root[data-theme="dark"] .filter-radio:has(input:checked) span { color: #e2d8ff; }

:root[data-theme="dark"] .filter-toggle input[type="checkbox"]:not(:checked)::before { background: #81769a; }

:root[data-theme="dark"] .filter-checkbox:hover,
:root[data-theme="dark"] .filter-radio:hover { background: rgba(165, 140, 255, .1); }

/* ---------- Select ---------- */
select {
    -webkit-appearance: none;
    appearance: none;
    padding-right: 40px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%235a3fc4' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    background-size: 15px;
    cursor: pointer;
}

:root[data-theme="dark"] select {
    background-color: #2a2438;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23cdbfff' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
    border-color: #4a405e;
    color: #f0e9ff;
}

:root[data-theme="dark"] select option { background: #2a2438; color: #f0e9ff; }

/* ---------- Action buttons ---------- */
.card-action,
.subject-exercise-card .card-action {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    min-height: 42px;
    margin-top: 6px;
    padding: 0 18px;
    border: 1px solid rgba(112, 72, 232, .2);
    border-radius: 13px;
    background: linear-gradient(180deg, #f7f3ff, #efe9ff);
    color: #5431c7;
    font-size: 13px;
    font-weight: 800;
    letter-spacing: .01em;
    text-decoration: none;
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease, color .2s ease, border-color .2s ease;
}

.card-action > span { display: inline-block; transition: transform .22s cubic-bezier(.34, 1.56, .64, 1); }

.card-action:hover,
.card-action:focus-visible {
    border-color: transparent;
    background: linear-gradient(135deg, #7d59f0, #5c38d0);
    color: #fff;
    box-shadow: 0 12px 24px rgba(93, 60, 208, .3);
    transform: translateY(-1px);
}

.card-action:hover > span,
.card-action:focus-visible > span { transform: translateX(4px); }
.card-action:active { transform: translateY(0) scale(.98); }

:root[data-theme="dark"] .card-action,
:root[data-theme="dark"] .subject-exercise-card .card-action {
    border-color: #5b4b7b;
    background: linear-gradient(180deg, #3a3053, #322a48);
    color: #e0d4ff;
}

:root[data-theme="dark"] .card-action:hover,
:root[data-theme="dark"] .card-action:focus-visible {
    border-color: transparent;
    background: linear-gradient(135deg, #9077f5, #7452e4);
    color: #fff;
    box-shadow: 0 12px 26px rgba(0, 0, 0, .4);
}

/* Hover must never swallow the label colour. */
.button { transition: transform .18s ease, box-shadow .2s ease, background .2s ease, color .2s ease, border-color .2s ease; }
.button:active:not(:disabled) { transform: scale(.98); }
.button-primary,
.button-primary:hover,
.button-primary:focus-visible,
.button-primary:active { color: #fff; }

.button-secondary:hover:not(:disabled),
.button-ghost:hover:not(:disabled) { background: #e8e0ff; color: #4526ad; border-color: #cfc0f8; }

:root[data-theme="dark"] .button-secondary:hover:not(:disabled),
:root[data-theme="dark"] .button-ghost:hover:not(:disabled) { background: #3b3152; color: #f6f0ff; border-color: #6a5a92; }

/* ---------- Game icons ---------- */
.game-icon .glyph-icon { width: 56%; height: 56%; }
.subject-card-icon .glyph-icon { width: 54%; height: 54%; }
.practice-target .game-icon .glyph-icon,
.recent-row .game-icon .glyph-icon { width: 54%; height: 54%; }
.glyph-icon { display: block; flex: none; }
.lessons-banner-link .glyph-icon { width: 20px; height: 20px; }

/* ---------- Guest navigation ---------- */
.main-nav.is-guest { justify-content: flex-start; }

.nav-guest {
    display: grid;
    gap: 10px;
    padding: 8px 4px;
}

.nav-guest p {
    margin: 0 0 6px;
    color: #6f6882;
    font-size: 13px;
    line-height: 1.6;
}

.nav-guest .button { width: 100%; justify-content: center; min-height: 44px; }
.main-nav .nav-guest .button-primary { color: #fff; }
.main-nav .nav-guest .button-secondary { color: #5431c7; }
.main-nav .nav-guest .button-secondary:hover { color: #4526ad; background: #e8e0ff; }
:root[data-theme="dark"] .main-nav .nav-guest .button-secondary { color: #e4dcf2; }
:root[data-theme="dark"] .main-nav .nav-guest .button-secondary:hover { color: #f6f0ff; background: #3b3152; }

:root[data-theme="dark"] .nav-guest p { color: #beb4d0; }

/* Dark theme: gameplay surfaces */
:root[data-theme="dark"] .game-header,
:root[data-theme="dark"] .game-panel,
:root[data-theme="dark"] .game-progress,
:root[data-theme="dark"] .accent-word-wrap {
  background: linear-gradient(180deg, rgba(34, 28, 58, .94), rgba(22, 18, 40, .94)) !important;
  border: 1px solid rgba(160, 140, 255, .22) !important;
  color: #f3f0ff !important;
  box-shadow: 0 18px 44px rgba(0, 0, 0, .38) !important;
}
:root[data-theme="dark"] .game-header h1,
:root[data-theme="dark"] .game-title h1,
:root[data-theme="dark"] .game-title .eyebrow { color: #f6f3ff !important; -webkit-text-fill-color: currentColor !important; }
:root[data-theme="dark"] .game-title .eyebrow { color: #b8a6ff !important; }
:root[data-theme="dark"] .math-problem,
:root[data-theme="dark"] .prompt-word,
:root[data-theme="dark"] .word-card,
:root[data-theme="dark"] .pattern-sequence,
:root[data-theme="dark"] .geometry-stage {
  background: linear-gradient(135deg, rgba(124, 92, 255, .28), rgba(70, 50, 150, .22)) !important;
  border: 1px solid rgba(160, 140, 255, .28);
  color: #ffffff !important;
  -webkit-text-fill-color: #ffffff !important;
}
:root[data-theme="dark"] .back-button {
  background: rgba(255, 255, 255, .08) !important;
  color: #f3f0ff !important;
  border: 1px solid rgba(255, 255, 255, .14);
}
:root[data-theme="dark"] .answer-area input {
  background: rgba(10, 8, 24, .6) !important;
  color: #fff !important;
  border-color: rgba(160, 140, 255, .35) !important;
}
:root[data-theme="dark"] .answer-area input::placeholder { color: #a79ccf; }
:root[data-theme="dark"] .hint-inline-button,
:root[data-theme="dark"] .speak-button {
  background: rgba(255, 255, 255, .08) !important;
  border: 1px solid rgba(255, 255, 255, .14) !important;
}
:root[data-theme="dark"] kbd { background: rgba(255, 255, 255, .1); color: #f3f0ff; border-color: rgba(255, 255, 255, .2); }
:root[data-theme="dark"] .prompt-hint,
:root[data-theme="dark"] .keyboard-hint { color: #b9b0dc; }
:root[data-theme="dark"] .tip-card { background: rgba(255, 190, 90, .1); border-color: rgba(255, 190, 90, .25); color: #ffd9a0; }
:root[data-theme="dark"] .tip-card p { color: #e7c496; }