/* 教育遊戲: the hub (/tools/games/) and one page per game. The games themselves style their own sandboxed documents. */
.gm-hub, .gm-page { max-width: 76rem; margin: 0 auto; }
.gm-back { display: inline-flex; align-items: center; gap: .35rem; min-height: 2.75rem; margin-bottom: .4rem; }
.gm-back svg { width: 1rem; transform: rotate(180deg); }

.gm-hero { position: relative; display: flex; justify-content: space-between; align-items: flex-end; gap: 2rem; padding: 2.4rem 2.4rem 2.2rem; margin-bottom: 1.4rem; border-radius: 1.8rem; background: var(--ink); color: var(--bg); overflow: hidden; isolation: isolate; }
.gm-hero h1 { margin: .2rem 0 .6rem; font-size: clamp(2.2rem, 5vw, 3.6rem); letter-spacing: -.04em; line-height: 1.05; color: inherit; }
.gm-hero p { max-width: 38rem; margin: 0; color: color-mix(in srgb, var(--bg) 78%, transparent); line-height: 1.75; }
.gm-hero .eyebrow { color: color-mix(in srgb, var(--bg) 62%, transparent); }
.gm-hero-dots { display: flex; gap: .4rem; flex-shrink: 0; }
.gm-hero-dots i { width: .85rem; height: .85rem; border-radius: 50%; background: currentColor; opacity: calc(.18 + var(--i) * .13); animation: gm-dot 2.4s ease-in-out infinite; animation-delay: calc(var(--i) * .12s); }
@keyframes gm-dot { 0%, 100% { transform: translateY(0); } 40% { transform: translateY(-.55rem); } }

.gm-filters { display: grid; gap: .7rem; margin: 0 0 1.4rem; }
.gm-levels, .gm-subjects { display: flex; flex-wrap: wrap; gap: .45rem; }
.gm-filters button { min-height: 2.6rem; padding: .45rem 1.05rem; border: 0; border-radius: 99px; background: var(--surface); color: var(--ink); box-shadow: var(--shadow); font: inherit; font-size: .9rem; font-weight: 600; cursor: pointer; transition: background .2s, color .2s, transform .2s cubic-bezier(.2,.9,.25,1.3); touch-action: manipulation; }
.gm-filters button small { margin-left: .25rem; font-weight: 500; opacity: .6; font-variant-numeric: tabular-nums; }
.gm-filters button:hover { transform: translateY(-1px); }
.gm-filters button:active { transform: scale(.96); }
.gm-hub .gm-filters button[aria-checked="true"] { background: var(--ink); color: var(--bg); }
.gm-levels button { font-size: 1rem; padding-inline: 1.3rem; }
.gm-subjects button { font-size: .84rem; font-weight: 550; }

.gm-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 17rem), 1fr)); gap: 1.1rem; }
.gm-card { --gm: #2f6fed; display: grid; align-content: start; gap: .5rem; padding: .7rem .7rem 1.2rem; border-radius: 1.5rem; background: var(--surface); box-shadow: var(--shadow); color: inherit; text-decoration: none; animation: gm-in .55s cubic-bezier(.2,.9,.25,1.1) both; animation-delay: calc(var(--i) * 55ms); transition: transform .35s cubic-bezier(.2,.9,.25,1.2), box-shadow .35s; }
.gm-card[hidden] { display: none; }
.gm-card:hover { color: inherit; transform: translateY(-5px); box-shadow: 0 20px 44px color-mix(in srgb, var(--gm) 24%, transparent), 0 0 0 1px color-mix(in srgb, var(--gm) 32%, transparent); }
.gm-card:focus-visible { outline: 3px solid var(--ink); outline-offset: 3px; }
.gm-card h3 { margin: .15rem .5rem 0; font-size: 1.12rem; letter-spacing: -.015em; }
.gm-card p { margin: 0 .5rem; font-size: .86rem; line-height: 1.65; color: var(--muted); }
.gm-cover { position: relative; display: block; aspect-ratio: 16 / 10; border-radius: 1.05rem; overflow: hidden; background: var(--gm); }
.gm-cover img { display: block; width: 100%; height: 100%; object-fit: cover; transition: transform .7s cubic-bezier(.2,.8,.2,1); }
.gm-card:hover .gm-cover img { transform: scale(1.05); }
.gm-cover-blank { display: grid; place-items: center; width: 100%; height: 100%; color: #fff; }
.gm-cover-blank b { font-size: 4.5rem; font-weight: 700; opacity: .9; }
.gm-play { position: absolute; right: .75rem; bottom: .75rem; display: grid; place-items: center; width: 2.8rem; height: 2.8rem; border-radius: 50%; background: #fff; color: #111; box-shadow: 0 6px 18px #0003; transform: scale(.7); opacity: 0; transition: transform .35s cubic-bezier(.2,.9,.25,1.4), opacity .25s; }
.gm-play svg { width: 1.1rem; height: 1.1rem; margin-left: .15rem; }
.gm-card:hover .gm-play, .gm-card:focus-visible .gm-play { transform: scale(1); opacity: 1; }
.gm-tags { display: flex; flex-wrap: wrap; gap: .35rem; margin: .35rem .5rem 0; padding: 0; }
.gm-tags span { padding: .14rem .6rem; border-radius: 99px; font-size: .74rem; font-weight: 650; background: color-mix(in srgb, var(--gm) 13%, var(--surface)); color: color-mix(in srgb, var(--gm) 72%, var(--ink)); }
.gm-tags span:first-child { background: var(--ink); color: var(--bg); }
@keyframes gm-in { from { opacity: 0; transform: translateY(14px) scale(.98); } }
.gm-empty { padding: 3rem 1rem; text-align: center; color: var(--muted); }
.gm-privacy { display: flex; align-items: flex-start; gap: .5rem; margin-top: 2rem; }
.gm-privacy svg { width: 1rem; height: 1rem; flex-shrink: 0; margin-top: .2rem; }

/* links from the tools pages */
.gm-feature { margin-bottom: 2rem; }
.gm-feature .ti-section-head { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; }
.gm-banner { display: flex; align-items: center; justify-content: space-between; gap: 1.5rem; margin: 0 0 1.6rem; padding: 1.5rem 1.7rem; border-radius: 1.5rem; background: var(--ink); color: var(--bg); text-decoration: none; transition: transform .3s cubic-bezier(.2,.9,.25,1.2); }
.gm-banner:hover { color: var(--bg); transform: translateY(-3px); }
.gm-banner > span { display: grid; gap: .25rem; }
.gm-banner small { opacity: .65; font-weight: 600; }
.gm-banner b { font-size: 1.5rem; letter-spacing: -.02em; }
.gm-banner span span { opacity: .8; font-size: .92rem; line-height: 1.6; }
.gm-banner em { display: inline-flex; align-items: center; gap: .4rem; flex-shrink: 0; padding: .6rem 1.1rem; border-radius: 99px; background: var(--bg); color: var(--ink); font-style: normal; font-weight: 700; font-size: .9rem; }
.gm-banner em svg { width: 1rem; height: 1rem; }
@media (max-width: 640px) { .gm-banner { flex-direction: column; align-items: flex-start; } }

/* one game */
.gm-head { margin-bottom: 1.1rem; }
.gm-head .gm-tags { margin: 0 0 .5rem; }
.gm-head h1 { margin: 0 0 .35rem; font-size: clamp(1.9rem, 4vw, 2.8rem); letter-spacing: -.035em; }
.gm-head p { margin: 0; max-width: 44rem; color: var(--muted); }
.gm-stage { margin: 0 0 1.6rem; }
.gm-frame { position: relative; height: min(82vh, 52rem); min-height: 34rem; border-radius: 1.5rem; overflow: hidden; background: #0b0e14; box-shadow: 0 24px 60px #0b0e1433; }
.gm-frame iframe { display: block; width: 100%; height: 100%; border: 0; background: #0b0e14; }
.gm-loading { position: absolute; inset: 0; display: grid; place-items: center; color: #fff; background: #0b0e14; transition: opacity .5s; pointer-events: none; }
.gm-loading.is-done { opacity: 0; }
.gm-stage:fullscreen { display: flex; flex-direction: column; background: #0b0e14; padding: 0; }
.gm-stage:fullscreen .gm-frame { flex: 1; height: auto; border-radius: 0; box-shadow: none; }
.gm-stage:fullscreen .gm-bar { padding: .5rem .8rem; background: #0b0e14; }
.gm-stage:fullscreen .gm-pill { background: #1b2130; color: #fff; }
.gm-bar { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: .8rem; }
.gm-page .gm-pill { display: inline-flex; align-items: center; gap: .45rem; min-height: 2.7rem; padding: .45rem 1.1rem; border: 0; border-radius: 99px; background: var(--ink); color: var(--bg); font: inherit; font-size: .88rem; font-weight: 600; cursor: pointer; transition: transform .2s; touch-action: manipulation; }
.gm-pill svg { width: 1rem; height: 1rem; }
.gm-page .gm-pill.is-quiet { background: var(--surface); color: var(--ink); box-shadow: var(--shadow); }
.gm-pill:active { transform: scale(.96); }
.gm-info { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 20rem), 1fr)); gap: 1.1rem; margin-bottom: 2rem; }
.gm-info section { padding: 1.4rem 1.5rem; border-radius: 1.3rem; background: var(--surface); box-shadow: var(--shadow); }
.gm-info h2, .gm-more h2 { margin: 0 0 .8rem; font-size: 1.1rem; }
.gm-topics { display: flex; flex-wrap: wrap; gap: .4rem; margin: 0; padding: 0; list-style: none; }
.gm-topics li { padding: .25rem .75rem; border-radius: 99px; font-size: .84rem; background: var(--bg); }
.gm-howto { margin: 0; padding-left: 1.1rem; line-height: 1.8; font-size: .92rem; }

@media (max-width: 640px) {
  .gm-hero { padding: 1.6rem 1.3rem; flex-direction: column; align-items: flex-start; gap: 1.2rem; border-radius: 1.4rem; }
  .gm-subjects { flex-wrap: nowrap; overflow-x: auto; margin-inline: -16px; padding: .2rem 16px .5rem; scrollbar-width: none; }
  .gm-subjects button { flex-shrink: 0; }
  .gm-frame { height: calc(100svh - 7rem); min-height: 28rem; border-radius: 1.1rem; margin-inline: -6px; }
}
@media (prefers-reduced-motion: reduce) { .gm-card, .gm-hero-dots i { animation: none; } }