/* Mindcraft — original blocky "inventory GUI" look. Single dark world on purpose. */
:root {
  --night: #1E2126;
  --night-2: #262A31;
  --gui: #C6C6C6;
  --gui-hi: #FFFFFF;
  --gui-lo: #555555;
  --gui-edge: #1B1B1B;
  --slot: #8B8B8B;
  --ink: #2B2B2B;
  --ink-soft: #4E4E4E;
  --stone-btn: #7A7A7A;
  --grass: #5B9A2E;
  --dirt: #7B5230;
  --xp: #7FE030;
  --diamond: #45D8E0;
  --gold: #F2C230;
  --heart: #E0373D;
  --good: #3F8F2A;
  --bad: #B8322F;
  --px: "Press Start 2P", ui-monospace, Menlo, "Noto Sans TC", "PingFang TC", monospace;
  --zh: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  color-scheme: dark;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background-color: var(--night);
  background-image:
    linear-gradient(45deg, rgba(255,255,255,.018) 25%, transparent 25%, transparent 75%, rgba(255,255,255,.018) 75%),
    linear-gradient(45deg, rgba(255,255,255,.018) 25%, transparent 25%, transparent 75%, rgba(255,255,255,.018) 75%);
  background-size: 32px 32px;
  background-position: 0 0, 16px 16px;
  color: #EDEDED;
  font-family: var(--zh);
  font-size: 17px;
  line-height: 1.6;
}
.app { max-width: 640px; margin: 0 auto; padding: 18px 14px 56px; }
[hidden] { display: none !important; }
.px { font-family: var(--px); font-size: 11px; letter-spacing: .04em; }
svg.pix { image-rendering: pixelated; shape-rendering: crispEdges; }

/* logo */
.logo-wrap { text-align: center; padding: 18px 0 14px; }
.logo { margin: 0; font-family: var(--px); font-weight: 400; font-size: clamp(30px, 9vw, 52px); line-height: 1.15; letter-spacing: .02em;
        color: #D9D9D9; text-shadow: 0 4px 0 #6B6B6B, 0 8px 0 #3A3A3A, 0 10px 14px rgba(0,0,0,.5); }
.logo .who { display: block; font-size: .42em; letter-spacing: .24em; margin: 0 0 .45em .24em; color: var(--gold); text-shadow: 0 3px 0 #8A6A12, 0 6px 10px rgba(0,0,0,.5); }
.logo span:last-child { color: var(--grass); text-shadow: 0 4px 0 #3D6B1E, 0 8px 0 var(--dirt), 0 10px 14px rgba(0,0,0,.5); }
.tagline { margin: 16px 0 0; color: #BFBFBF; font-size: 15px; }

/* language toggle (English | 中文) */
.lang-toggle { display: inline-flex; margin: 22px auto 0; border: 3px solid var(--gui-edge); border-radius: 2px; box-shadow: 0 4px 0 rgba(0,0,0,.35); }
.lang-toggle button { font: 700 15px/1 var(--zh); color: #FFF; text-shadow: 2px 2px 0 #3F3F3F; background: var(--stone-btn); cursor: pointer;
                      border: 0; box-shadow: inset 3px 3px 0 #A9A9A9, inset -3px -3px 0 #4F4F4F; padding: 10px 16px; min-width: 96px; }
.lang-toggle button + button { border-left: 3px solid var(--gui-edge); }
.lang-toggle button.en { font-family: var(--px); font-size: 10px; font-weight: 400; }
.lang-toggle button:hover { background: #8A8F9C; }
.lang-toggle button[aria-pressed="true"] { background: var(--grass); box-shadow: inset 3px 3px 0 #86C555, inset -3px -3px 0 #3A6A1B; cursor: default; }
.lang-toggle button:focus-visible { outline: 3px solid var(--gold); outline-offset: 2px; position: relative; }

/* inventory-style panel */
.gui { background: var(--gui); color: var(--ink); border: 3px solid var(--gui-edge); border-radius: 4px; padding: 14px;
       box-shadow: inset 3px 3px 0 var(--gui-hi), inset -3px -3px 0 var(--gui-lo); margin-bottom: 14px; }

/* HUD */
.hud-row { display: flex; align-items: center; gap: 10px; }
.lvl { font-family: var(--px); font-size: 12px; white-space: nowrap; }
.lvl b { color: #2F7A12; }
.xpbar { flex: 1; height: 14px; background: #2B2B2B; border: 2px solid var(--gui-edge); position: relative; }
.xpbar div { height: 100%; width: 0; background: repeating-linear-gradient(90deg, var(--xp) 0 18px, #5DB81E 18px 20px); transition: width .4s; }
.xp-num { font-family: var(--px); font-size: 10px; color: var(--ink-soft); white-space: nowrap; font-variant-numeric: tabular-nums; }
.hud-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-top: 12px; }
.stat { background: var(--slot); border: 2px solid; border-color: #373737 #FFF #FFF #373737; display: grid; justify-items: center; padding: 6px 2px 4px; }
.stat i { width: 26px; height: 26px; display: block; }
.stat b { font-family: var(--px); font-size: 13px; color: #FFF; text-shadow: 2px 2px 0 #3F3F3F; margin-top: 4px; }
.stat small { font-size: 11px; color: #EEE; font-weight: 700; text-align: center; line-height: 1.3; }

/* quest */
.quest-head { display: flex; justify-content: space-between; align-items: center; }
.quest-head .px { color: #6A4A12; }
#quest-state { font-size: 13px; font-weight: 700; color: var(--good); }
.quest p { margin: 4px 0 8px; font-weight: 700; }
.questbar { height: 12px; background: #2B2B2B; border: 2px solid var(--gui-edge); }
.questbar div { height: 100%; width: 0; background: var(--gold); transition: width .4s; }

.section-title { font-size: 16px; font-weight: 900; margin: 22px 0 10px; color: #EDEDED; letter-spacing: .06em; }

/* biomes */
.biomes { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.biome { display: grid; text-align: left; font: inherit; color: var(--ink); cursor: pointer; padding: 0; border: 3px solid var(--gui-edge); border-radius: 4px;
         background: var(--gui); box-shadow: inset -3px -3px 0 var(--gui-lo); overflow: hidden; }
.biome:hover:not(:disabled) { transform: translateY(-2px); }
.biome:focus-visible, .btn:focus-visible, .mode:focus-visible, .option:focus-visible { outline: 3px solid var(--gold); outline-offset: 2px; }
.biome:disabled { cursor: default; filter: grayscale(.85) brightness(.8); }
.biome .land { height: 64px; display: block; }
.biome .meta { padding: 8px 10px 10px; display: grid; gap: 2px; }
.biome .meta b { font-size: 17px; font-weight: 900; }
.biome .meta span { font-size: 13px; color: var(--ink-soft); font-weight: 500; }
.biome .mobs { color: var(--bad); font-weight: 700; }
.land-mine { background:
  radial-gradient(circle at 20% 55%, var(--diamond) 0 4px, transparent 5px),
  radial-gradient(circle at 70% 35%, var(--gold) 0 4px, transparent 5px),
  radial-gradient(circle at 45% 75%, #D8AF93 0 4px, transparent 5px),
  repeating-linear-gradient(0deg, #6E6E6E 0 16px, #7E7E7E 16px 32px); }
.land-forest { background: linear-gradient(#78B4E8 0 30%, transparent 30%),
  repeating-linear-gradient(90deg, #2E6B1F 0 14px, #3D8526 14px 22px) 0 30% / 100% 36% no-repeat,
  linear-gradient(transparent 66%, var(--grass) 66% 78%, var(--dirt) 78%); }
.land-village { background: linear-gradient(#8FC7F0 0 45%, transparent 45%),
  repeating-linear-gradient(90deg, #A0773F 0 22px, #8A6433 22px 26px, transparent 26px 40px) 0 45% / 100% 33% no-repeat,
  linear-gradient(transparent 78%, var(--grass) 78% 88%, var(--dirt) 88%); }
.land-jungle { background: repeating-linear-gradient(90deg, #1F5E1A 0 10px, #2F7F24 10px 20px, #3E9A2C 20px 26px),
  linear-gradient(transparent 80%, var(--dirt) 80%); background-blend-mode: normal; }
.land-desert { background: linear-gradient(#F4C06A 0 42%, transparent 42%),
  linear-gradient(transparent 42%, #E3D18E 42% 70%, #CDB878 70%); }

/* other worlds (merged games) */
.worlds { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.world { display: grid; text-decoration: none; color: var(--ink); border: 3px solid var(--gui-edge); border-radius: 4px;
         background: var(--gui); box-shadow: inset -3px -3px 0 var(--gui-lo); overflow: hidden; }
.world:hover { transform: translateY(-2px); }
.world:focus-visible { outline: 3px solid var(--gold); outline-offset: 2px; }
.world .land { height: 64px; display: block; }
.world .meta { padding: 8px 10px 10px; display: grid; gap: 2px; }
.world .meta b { font-size: 17px; font-weight: 900; }
.world .meta span { font-size: 13px; color: var(--ink-soft); font-weight: 500; }
.land-torii { background:
  linear-gradient(90deg, transparent 22%, #C8322B 22% 30%, transparent 30% 70%, #C8322B 70% 78%, transparent 78%) 0 38% / 100% 62% no-repeat,
  linear-gradient(#C8322B, #C8322B) 12% 22% / 76% 12% no-repeat,
  linear-gradient(#F6D6DC 0 70%, #E9A7B5 70%); }
.land-lab { background:
  radial-gradient(circle at 30% 60%, #6EE06A 0 9px, transparent 10px),
  radial-gradient(circle at 70% 55%, #E86BD2 0 9px, transparent 10px),
  repeating-linear-gradient(90deg, #3B3F57 0 16px, #34384E 16px 32px); }
@media (max-width: 420px) { .worlds { grid-template-columns: 1fr; } }

/* achievements */
.achievements { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 8px; }
.ach { display: flex; align-items: center; gap: 8px; background: var(--night-2); border: 2px solid #3A3F47; padding: 8px; border-radius: 3px; font-size: 13px; }
.ach i { width: 24px; height: 24px; flex: none; }
.ach.locked { opacity: .45; }
.ach.locked i { filter: grayscale(1); }
.ach b { display: block; font-size: 13px; }
.ach small { color: #AFAFAF; font-size: 11.5px; }
.foot { color: #8E8E8E; font-size: 12.5px; text-align: center; margin-top: 26px; }

/* buttons */
.btn { font: inherit; font-weight: 700; color: #FFF; text-shadow: 2px 2px 0 #3F3F3F; background: var(--stone-btn); cursor: pointer; width: 100%;
       border: 3px solid var(--gui-edge); box-shadow: inset 3px 3px 0 #A9A9A9, inset -3px -3px 0 #4F4F4F; padding: 10px 14px; border-radius: 2px; }
.btn:hover { background: #8A8F9C; }
.btn.primary { background: var(--grass); box-shadow: inset 3px 3px 0 #86C555, inset -3px -3px 0 #3A6A1B; }
.btn.small { width: auto; padding: 6px 12px; font-size: 14px; margin-bottom: 10px; }
.actions { display: grid; gap: 10px; }

/* biome screen */
.biome-banner { border: 3px solid var(--gui-edge); border-radius: 4px; height: 96px; margin-bottom: 12px; position: relative; display: flex; align-items: flex-end; }
.biome-banner h2 { margin: 0; padding: 8px 12px; font-size: 22px; font-weight: 900; color: #FFF; text-shadow: 2px 2px 0 #000; }
.field { display: block; border: 0; padding: 0; margin: 0 0 12px; }
.field > span, .field legend { display: block; font-weight: 900; margin-bottom: 6px; }
select { width: 100%; font: inherit; color: var(--ink); background: #E6E6E6; border: 2px solid; border-color: #373737 #FFF #FFF #373737; padding: 8px 10px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chips input { position: absolute; opacity: 0; }
.chips span { display: inline-block; padding: 6px 12px; background: #DADADA; border: 2px solid; border-color: #FFF #373737 #373737 #FFF; font-size: 14px; font-weight: 700; cursor: pointer; }
.chips input:checked + span { background: var(--grass); color: #FFF; border-color: #3A6A1B #86C555 #86C555 #3A6A1B; }
.chips input:focus-visible + span { outline: 3px solid var(--gold); }
.ore-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin: 0 0 12px; }
.info { color: var(--ink-soft); font-size: 14px; margin: 0 0 12px; }
.modes { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.mode { font: inherit; text-align: left; cursor: pointer; background: #DADADA; color: var(--ink); border: 3px solid var(--gui-edge);
        box-shadow: inset 3px 3px 0 #FFF, inset -3px -3px 0 #8A8A8A; padding: 10px; display: grid; gap: 2px; }
.mode:hover:not(:disabled) { background: #E9E9E9; }
.mode:disabled { opacity: .5; cursor: not-allowed; }
.mode i { width: 28px; height: 28px; }
.mode b { font-size: 17px; font-weight: 900; }
.mode small { font-size: 12.5px; color: var(--ink-soft); }

/* battle */
.battle-top { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.battle-top .btn.small { margin: 0; }
.hearts { display: flex; gap: 4px; }
.hearts i { width: 24px; height: 24px; display: block; }
.hearts i.lost { opacity: .25; filter: grayscale(1); }
.small-px { font-size: 10px; color: #CFCFCF; }
.arena { height: 190px; margin: 12px 0; border: 3px solid var(--gui-edge); border-radius: 4px; position: relative; display: grid; place-items: center;
         background: linear-gradient(#2B3A55, #4A6283 60%, var(--grass) 60% 68%, var(--dirt) 68%); overflow: hidden; }
.mob { width: 112px; height: 112px; margin-top: -10px; }
.mob svg { width: 100%; height: 100%; }
.mob.hit { animation: hit .45s steps(4) forwards; }
.mob.bounce { animation: bounce .5s steps(2); }
@keyframes hit { 0% { transform: translateX(0); } 25% { transform: translateX(-8px); filter: brightness(2) saturate(0); } 50% { transform: translateX(8px); }
                 100% { transform: scale(.2) translateY(60px); opacity: 0; } }
@keyframes bounce { 50% { transform: translateY(-10px); } }
@media (prefers-reduced-motion: reduce) { .mob.hit, .mob.bounce { animation: none; } .mob.hit { opacity: .2; } .xpbar div, .questbar div { transition: none; } }
.mob-name { position: absolute; top: 8px; left: 0; right: 0; text-align: center; margin: 0; font-size: 14px; font-weight: 900; color: #FFF; text-shadow: 2px 2px 0 #000; }
.q-body p { margin: 0; }
.q-big { font-size: clamp(22px, 6vw, 28px); font-weight: 900; line-height: 1.5; }
.q-ask { color: var(--ink-soft); font-size: 14px; margin-top: 4px !important; }
.q-body { margin-bottom: 12px; }
.blank { display: inline-block; min-width: 3em; border-bottom: 3px solid var(--ink); margin: 0 4px; vertical-align: -2px; }
.options { display: grid; gap: 8px; }
.options.grid2 { grid-template-columns: 1fr 1fr; }
.option { font: inherit; font-weight: 700; text-align: left; background: var(--slot); color: #FFF; text-shadow: 1px 1px 0 #3F3F3F; cursor: pointer;
          border: 3px solid; border-color: #373737 #FFF #FFF #373737; padding: 10px 12px; }
.options.grid2 .option { text-align: center; font-size: 20px; }
.option:hover:not(:disabled) { background: #9C9C9C; }
.option.correct { background: var(--good); }
.option.wrong { background: var(--bad); }
.option:disabled { cursor: default; }
.option .letter { opacity: .85; margin-right: 6px; }
.feedback { margin-top: 12px; padding: 10px 12px; background: #E3E3E3; border: 2px solid; border-color: #373737 #FFF #FFF #373737; font-size: 15px; }
.feedback b { display: block; }
.feedback.good b { color: var(--good); }
.feedback.bad b { color: var(--bad); }
.feedback p { margin: 4px 0 0; }
.feedback .tip { border-top: 2px dashed #9A9A9A; padding-top: 6px; margin-top: 8px; }
#btn-next { margin-top: 12px; }
.reveal-box { text-align: center; }
.reveal-box .answer { font-size: 26px; font-weight: 900; margin: 6px 0 10px; }
.selfcheck { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }

/* result */
.result { text-align: center; }
.result .px { color: #6A4A12; font-size: 13px; }
.big { font-size: 26px; font-weight: 900; margin: 6px 0 10px; }
.loot { display: flex; justify-content: center; flex-wrap: wrap; gap: 10px; margin-bottom: 12px; }
.loot span { display: flex; align-items: center; gap: 6px; background: var(--slot); color: #FFF; font-weight: 900; text-shadow: 1px 1px 0 #3F3F3F;
             border: 2px solid; border-color: #373737 #FFF #FFF #373737; padding: 4px 10px; font-size: 14px; }
.loot i { width: 22px; height: 22px; }
.loot .new { background: #6A4A12; }
#result-review { text-align: left; margin-bottom: 12px; }
#result-review h3 { font-size: 15px; margin: 4px 0; }
.review-item { border-top: 2px dashed #9A9A9A; padding: 6px 0; font-size: 14px; }
.review-item b { font-size: 15px; }

@media (max-width: 420px) {
  .modes { grid-template-columns: 1fr; }
  .hud-stats { gap: 5px; }
}