:root {
    --blue-950: #12345b;
    --blue-700: #0874c9;
    --blue-100: #e1f5ff;
    --yellow-300: #ffd21e;
    --ink: #18304b;
}

* { box-sizing: border-box; }

body {
    min-width: 320px;
    margin: 0;
    color: var(--ink);
    font-family: "Nunito", "Segoe UI", sans-serif;
    background: linear-gradient(180deg, #e5f6ff 0%, #f8fcff 58%, #fff8d9 100%);
}

.menu-page { width: min(1200px, 100%); min-height: calc(100vh - 72px); margin: 0 auto; padding: clamp(28px, 6vw, 72px) 24px; }
.menu-header { max-width: 760px; margin: 0 auto 24px; text-align: center; padding: 12px 0; }

.menu-kicker {
    margin: 0 0 10px;
    color: var(--blue-700);
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

h1, h2, p { margin-top: 0; }
h1 { margin-bottom: 14px; color: var(--blue-950); font-size: clamp(2.1rem, 5vw, 3.7rem); line-height: 1.08; }
.menu-header > p:last-child { margin-bottom: 0; font-size: 1.1rem; line-height: 1.6; }

/* A largura fixa por card e o padding simétrico permitem centralizar as extremidades. */
.activity-carousel { --card-width: min(76vw, 410px); position: relative; scroll-margin-top: 90px; }
.carousel-track { position: relative; display: flex; gap: 24px; overflow-x: auto; padding: 30px calc((100% - var(--card-width)) / 2) 38px; scroll-snap-type: x mandatory; scrollbar-width: none; overscroll-behavior-x: contain; }
.carousel-track::-webkit-scrollbar { display: none; }
.carousel-track:focus-visible { outline: 2px solid var(--blue-700); outline-offset: 4px; border-radius: 20px; }
.carousel-track.is-dragging { scroll-snap-type: none; cursor: grabbing; }
.carousel-track.is-dragging .subject-card { cursor: grabbing; }
.carousel-controls { display: flex; align-items: center; justify-content: center; gap: 24px; }
.carousel-arrow { display: grid; place-items: center; width: 44px; height: 44px; padding: 0; border: 1px solid #c9dae7; border-radius: 50%; background: #fff; color: var(--blue-950); font: inherit; font-size: 1.4rem; cursor: pointer; }
.carousel-arrow:hover { background: #edf5fa; }
.carousel-arrow:disabled { opacity: .35; cursor: default; }
.carousel-dots { display: flex; gap: 2px; }
.carousel-dot { display: grid; place-items: center; width: 32px; height: 36px; padding: 0; border: 0; background: transparent; cursor: pointer; }
.carousel-dot::after { content: ""; width: 7px; height: 7px; border-radius: 50%; background: #b9cbd8; transition: width .2s; }
.carousel-dot[aria-pressed="true"]::after { width: 22px; border-radius: 8px; background: #17659a; }
.carousel-controls button:focus-visible { outline: 3px solid #17659a; outline-offset: 3px; }
.practice-disclosure { margin-top: 48px; scroll-margin-top: 90px; }
.practice-disclosure > summary { display: flex; justify-content: space-between; align-items: center; gap: 16px; padding: 22px 26px; border: 1px solid #dae5ed; border-radius: 18px; background: #fff; color: var(--blue-950); font-weight: 700; cursor: pointer; list-style: none; }
.practice-disclosure > summary::-webkit-details-marker { display: none; }
.practice-disclosure > summary:focus-visible { outline: 3px solid #17659a; outline-offset: 3px; }
.practice-disclosure[open] > summary > span { transform: rotate(45deg); }
.practice-disclosure .lightning-game { margin-top: 16px; }


.subject-card {
    display: flex;
    flex: 0 0 var(--card-width);
    min-width: 0;
    min-height: 360px;
    scroll-snap-align: center;
    padding: 32px;
    user-select: none;
    flex-direction: column;
    border: 1px solid #d6e3ed;
    border-radius: 24px;
    color: var(--ink);
    text-decoration: none;
    transform: scale(.92);
    transition: transform .25s ease, box-shadow .25s ease;
}

a.subject-card:hover { box-shadow: 0 8px 24px rgba(18, 52, 91, .08); }
a.subject-card:focus-visible { outline: 3px solid #17659a; outline-offset: 4px; }
.subject-card.is-active { transform: scale(1); box-shadow: 0 14px 30px rgba(18, 52, 91, .11); border-color: #a8c6dc; }
.subject-card--linear { background: #f0f7fc; }
.subject-card--quadratic { background: #fff9e8; }
.subject-card--checkers { background: #eef4fb; }
.subject-card--lightning { background: #fff8ed; }

.subject-card__number {
    display: grid;
    width: 52px;
    height: 52px;
    margin-bottom: 24px;
    border-radius: 16px;
    color: var(--blue-950);
    font-size: 1.25rem;
    font-weight: 900;
    background: var(--yellow-300);
    place-items: center;
}

.subject-card h2 { margin-bottom: 12px; color: var(--blue-950); font-size: 1.45rem; }
.subject-card p { line-height: 1.6; }
.subject-card__link { margin-top: auto; color: var(--blue-950); font-weight: 900; }

.lightning-game {
    display: grid;
    grid-template-columns: minmax(190px, .7fr) minmax(0, 1.3fr);
    gap: clamp(24px, 5vw, 56px);
    align-items: center;
    margin-top: clamp(42px, 7vw, 72px);
    padding: clamp(26px, 5vw, 48px);
    border: 2px solid rgba(18, 52, 91, 0.1);
    border-radius: 28px;
    background: #fff;
    box-shadow: 0 6px 24px rgba(18, 52, 91, .05);
}

.game-kicker { margin-bottom: 8px; color: var(--blue-700); font-weight: 900; }
.lightning-game h2 { margin-bottom: 10px; color: var(--blue-950); font-size: clamp(1.8rem, 4vw, 2.5rem); }
.lightning-game__intro > p:last-child { margin-bottom: 0; line-height: 1.6; }

.game-board { padding: clamp(20px, 4vw, 32px); border-radius: 22px; background: var(--blue-100); }
.game-question { margin-bottom: 22px; color: var(--blue-950); font-size: clamp(2rem, 6vw, 3rem); font-weight: 900; text-align: center; }
.game-form { display: grid; grid-template-columns: minmax(0, 1fr) auto auto; gap: 10px; }
.game-form input {
    min-width: 0;
    padding: 13px 14px;
    border: 2px solid #a9d8f2;
    border-radius: 12px;
    color: var(--ink);
    font: inherit;
    font-weight: 700;
    background: #fff;
}

.game-form input:focus { border-color: var(--blue-700); outline: 3px solid rgba(8, 116, 201, 0.2); }
.game-button { padding: 12px 16px; border: 2px solid transparent; border-radius: 12px; font: inherit; font-weight: 900; cursor: pointer; }
.game-button--confirm { color: var(--blue-950); background: var(--yellow-300); }
.game-button--new { border-color: var(--blue-700); color: var(--blue-950); background: #fff; }
.game-button:hover { transform: translateY(-1px); }
.game-button:focus-visible { outline: 3px solid var(--blue-950); outline-offset: 2px; }

.game-feedback { min-height: 1.6em; margin: 16px 0; color: var(--blue-950); font-weight: 800; text-align: center; }
.game-feedback--correct { color: #187143; }
.game-feedback--wrong { color: #a84218; }
.game-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin: 0; }
.game-stats div { padding: 10px 6px; border-radius: 12px; text-align: center; background: #fff; }
.game-stats dt { color: var(--blue-700); font-size: 0.72rem; font-weight: 800; }
.game-stats dd { margin: 4px 0 0; color: var(--blue-950); font-size: 1.25rem; font-weight: 900; }

.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

@media (max-width: 580px) {
    .menu-page { padding-inline: 18px; }
    .carousel-track { gap: 12px; }
    .subject-card { min-height: 320px; padding: 24px; }
    .carousel-controls { gap: 16px; }
    .carousel-arrow { width: 38px; height: 38px; }
    .lightning-game { grid-template-columns: 1fr; padding: 24px 18px; }
    .game-form { grid-template-columns: 1fr 1fr; }
    .game-form input { grid-column: 1 / -1; }
    .game-stats { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 581px) and (max-width: 1000px) { .lightning-game { grid-template-columns: 1fr; } }

.lightning-game > * { min-width: 0; }
@media (max-width: 380px) {
    .game-form { grid-template-columns: minmax(0, 1fr); }
    .game-form input { grid-column: auto; }
}

.game-form { grid-template-columns: minmax(0, 1fr) auto; margin-top: 18px; }
.game-form input { grid-column: auto; }
.game-button:disabled { opacity: .55; cursor: default; transform: none; }
.game-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
#game-start { display: block; margin: 0 auto; }
@media (max-width: 380px) { .game-form { grid-template-columns: minmax(0, 1fr); } }

/* Componente isolado das antigas grades de atividades. */
.activity-carousel { max-width: 960px; margin-inline: auto; --card-width: min(76vw, 410px); }
.activity-carousel .carousel-track { display: flex; flex-wrap: nowrap; }
.carousel-controls { padding-bottom: 12px; }
.carousel-arrow { position: absolute; top: 45%; z-index: 2; box-shadow: 0 4px 15px #12345b18; }
#carousel-prev { left: 4px; }
#carousel-next { right: 4px; }
.subject-card { opacity: .7; }
.subject-card.is-active { opacity: 1; }
@media (max-width: 580px) {
    .activity-carousel { --card-width: min(85vw, calc(100vw - 56px)); }
    .carousel-arrow { width: 32px; height: 36px; }
}

.subject-card--queda { background: #edf4ff; }

.subject-card--chess { background: #f6f0e7; }

.subject-card--data { background: #edf7f6; }

/* Aplicações de estudo ficam separadas do carrossel de jogos. */
.activities-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 24px; scroll-margin-top: 92px; }
.activities-grid .subject-card { transform: none; opacity: 1; user-select: auto; min-height: 0; }
.activity-example { padding: 18px; border-radius: 14px; background: #ffffffb3; }
@media(max-width:767px) { .activities-grid { grid-template-columns: 1fr; gap: 18px; } }