:root{
    --bg: #f6f0e1;
    --panel: #fffaf0;
    --panel-2: #efe6d0;
    --ink: #2a241c;
    --muted: #6d6250;
    --line: #d9ccb0;
    --accent: #2e7323;
    --accent-ink: #ffffff;
    --sun: #ffd23a;
    --sun-deep: #e8a915;
    --danger: #c8372b;
    --danger-bg: #fde8e4;
    --code-bg: #2a241c;
    --code-ink: #f6f0e1;
    --bubble: #ffffff;
    --bubble-line: #2a241c;
    --shadow: 0 2px 0 rgba(42, 36, 28, 0.18);
    --radius: 14px;
    --font-head: "Fredoka", "Trebuchet MS", sans-serif;
    --font-body: "Nunito", "Segoe UI", sans-serif;
    --font-code: "JetBrains Mono", Consolas, monospace;
    color-scheme: light;
}

@media (prefers-color-scheme: dark){
    :root:not([data-theme="light"]){
        --bg: #15171c;
        --panel: #1e2128;
        --panel-2: #262a33;
        --ink: #ece6d6;
        --muted: #a69f8c;
        --line: #353a45;
        --accent: #6cc04f;
        --accent-ink: #10130d;
        --danger: #ff6b5c;
        --danger-bg: #3a1d1a;
        --code-bg: #0e0f12;
        --code-ink: #ece6d6;
        --bubble: #262a33;
        --bubble-line: #ece6d6;
        --shadow: 0 2px 0 rgba(0, 0, 0, 0.5);
        color-scheme: dark;
    }
}

:root[data-theme="dark"]{
    --bg: #15171c;
    --panel: #1e2128;
    --panel-2: #262a33;
    --ink: #ece6d6;
    --muted: #a69f8c;
    --line: #353a45;
    --accent: #6cc04f;
    --accent-ink: #10130d;
    --danger: #ff6b5c;
    --danger-bg: #3a1d1a;
    --code-bg: #0e0f12;
    --code-ink: #ece6d6;
    --bubble: #262a33;
    --bubble-line: #ece6d6;
    --shadow: 0 2px 0 rgba(0, 0, 0, 0.5);
    color-scheme: dark;
}

*{ box-sizing: border-box; }

html{ scroll-behavior: smooth; scroll-padding-top: 72px; }

body{
    margin: 0;
    background: var(--bg);
    color: var(--ink);
    font: 17px/1.6 var(--font-body);
    overflow-wrap: anywhere;
}

img.pixel{ image-rendering: pixelated; }

h1, h2, h3{ font-family: var(--font-head); line-height: 1.2; margin: 0 0 0.5em; }
h1{ font-size: clamp(2rem, 6vw, 3.4rem); }
h2{ font-size: clamp(1.5rem, 4vw, 2.1rem); }
h3{ font-size: 1.2rem; margin-top: 1.4em; }
p{ margin: 0 0 1em; }
a{ color: var(--accent); }
code{ font-family: var(--font-code); font-size: 0.9em; background: var(--panel-2); padding: 0.1em 0.35em; border-radius: 6px; }
pre{ background: var(--code-bg); color: var(--code-ink); padding: 14px 16px; border-radius: 10px; overflow-x: auto; font: 14px/1.5 var(--font-code); white-space: pre-wrap; overflow-wrap: anywhere; }
pre code{ background: none; padding: 0; color: inherit; }

.skip{ position: absolute; left: -999px; }
.skip:focus{ left: 16px; top: 16px; z-index: 10; background: var(--panel); padding: 8px 12px; border-radius: 8px; }

.layout{ display: block; max-width: 1180px; margin: 0 auto; padding: 0 16px; }

.toc{
    position: sticky; top: 0; z-index: 5;
    margin: 0 -16px; padding: 10px 16px;
    background: color-mix(in srgb, var(--bg) 92%, transparent);
    backdrop-filter: blur(6px);
    border-bottom: 1px solid var(--line);
}
.toc ol{ list-style: none; margin: 0; padding: 0; display: flex; gap: 8px; overflow-x: auto; scrollbar-width: thin; }
.toc a{ display: block; white-space: nowrap; text-decoration: none; color: var(--ink); background: var(--panel); border: 1px solid var(--line); padding: 6px 12px; border-radius: 999px; font-weight: 700; font-size: 0.9rem; }
.toc a:hover, .toc a[aria-current="true"]{ background: var(--sun); color: #2a241c; border-color: var(--sun-deep); }
.toc .num{ color: var(--muted); margin-right: 4px; }
.toc a[aria-current="true"] .num{ color: #6d4b00; }

main{ min-width: 0; }

.hero{ display: grid; gap: 20px; align-items: center; padding: 36px 0 20px; }
.hero .tag{ display: inline-block; font-weight: 800; color: var(--accent); text-transform: uppercase; letter-spacing: 0.06em; font-size: 0.8rem; }
.hero p.lead{ font-size: 1.15rem; color: var(--muted); max-width: 40ch; }
.hero .mascot{ width: min(220px, 50vw); justify-self: center; animation: hop 2.4s ease-in-out infinite; }

.chapter{ padding: 36px 0 12px; border-top: 2px dashed var(--line); }
.chapter .kicker{ font: 700 0.85rem var(--font-head); color: var(--muted); text-transform: uppercase; letter-spacing: 0.08em; }

.scene{ display: grid; gap: 14px; background: var(--panel); border: 2px solid var(--line); border-radius: var(--radius); padding: 16px; margin: 18px 0 24px; box-shadow: var(--shadow); position: relative; }
.scene[data-mood="serious"]{ border-color: var(--danger); background: var(--danger-bg); }
.stage{ display: grid; grid-template-columns: 96px 1fr; gap: 12px; align-items: start; }
.wb{ width: 96px; height: auto; image-rendering: pixelated; transform-origin: 50% 100%; }
.scene.talking .wb{ animation: bounce 0.36s ease-in-out infinite; }
.scene.done .wb{ animation: hop 0.6s ease-out 1; }
.bubble{ position: relative; background: var(--bubble); border: 3px solid var(--bubble-line); border-radius: 16px; padding: 12px 14px; font: 600 1.02rem/1.45 var(--font-head); }
.bubble::before{ content: ""; position: absolute; left: -14px; top: 22px; border: 8px solid transparent; border-right: 12px solid var(--bubble-line); border-left: 0; }
.bubble::after{ content: ""; position: absolute; left: -9px; top: 25px; border: 5px solid transparent; border-right: 8px solid var(--bubble); border-left: 0; }
.bubble .line{ margin: 0 0 0.45em; position: relative; }
.bubble .line:last-child{ margin-bottom: 0; }
.scene.js .line .ghost{ color: transparent; }
.scene.js .line .typed{ position: absolute; inset: 0; }
.scene[data-mood="serious"] .bubble{ border-color: var(--danger); }
.scene[data-mood="serious"] .bubble::before{ border-right-color: var(--danger); }
.replay{ justify-self: end; font: 700 0.85rem var(--font-head); background: none; color: var(--muted); border: 1px solid var(--line); border-radius: 999px; padding: 4px 12px; cursor: pointer; }
.replay:hover{ color: var(--ink); border-color: var(--ink); }
.scene:not(.js) .replay{ display: none; }

.diagram{ background: var(--panel-2); border-radius: 12px; padding: 14px; min-height: 120px; overflow: hidden; }
.diagram svg{ display: block; width: 100%; height: auto; max-height: 260px; }

.card{ background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; margin: 12px 0; }
.grid-2{ display: grid; gap: 12px; }
.need{ display: grid; grid-template-columns: 44px 1fr; gap: 12px; align-items: start; }
.need .ico{ font-size: 1.6rem; line-height: 44px; text-align: center; background: var(--panel-2); border-radius: 10px; }
.need h3{ margin: 0 0 0.2em; }

.compare{ display: grid; gap: 12px; }
.compare .bad, .compare .good{ border-radius: 12px; padding: 12px 14px; border: 2px solid; }
.compare .bad{ border-color: var(--danger); background: var(--danger-bg); }
.compare .good{ border-color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, var(--panel)); }
.compare .label{ font: 700 0.8rem var(--font-head); text-transform: uppercase; letter-spacing: 0.08em; }
.compare blockquote{ margin: 6px 0 0; font-style: italic; }

.callout{ border-left: 6px solid var(--sun-deep); background: color-mix(in srgb, var(--sun) 18%, var(--panel)); padding: 12px 16px; border-radius: 8px; margin: 16px 0; }
.callout.big{ font-size: 1.15rem; font-weight: 700; }
.warning{ border-left-color: var(--danger); background: var(--danger-bg); }

.chapter.must{ position: relative; margin: 24px -16px 0; padding: 40px 16px 24px; border: 4px solid var(--danger); border-radius: 18px; background: color-mix(in srgb, var(--danger) 7%, var(--bg)); }
.chapter.must + .chapter{ border-top: 0; }
.chapter.must .kicker{ color: var(--danger); }
.chapter.must h2{ font-size: clamp(2rem, 7vw, 3.2rem); color: var(--danger); text-transform: uppercase; letter-spacing: 0.02em; }
.chapter.must .stamp{ font-size: clamp(1.8rem, 7vw, 3.2rem); border-width: 6px; }
.toc li.must a{ border: 2px solid var(--danger); color: var(--danger); background: var(--danger-bg); }
.toc li.must .num{ color: var(--danger); }
.must-link{ font-weight: 800; color: var(--danger); }
.must-link a{ color: var(--danger); }
.shots{ display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); align-items: start; margin: 16px 0; }
.shots figure{ margin: 0; padding: 10px; }
.shots img{ display: block; width: 100%; height: auto; border-radius: 8px; image-rendering: auto; }
.shots figcaption{ font-size: 0.9rem; color: var(--muted); margin-top: 8px; }
.stamp{ display: inline-block; font: 700 clamp(1.4rem, 5vw, 2.4rem) var(--font-head); color: var(--danger); border: 5px solid var(--danger); border-radius: 12px; padding: 6px 16px; transform: rotate(-4deg); letter-spacing: 0.04em; }
.scene.playing .stamp{ animation: thump 0.9s ease-out 0.6s both; }

.tree{ font: 14px/1.7 var(--font-code); background: var(--code-bg); color: var(--code-ink); border-radius: 10px; padding: 12px 16px; }
.tree .dir{ color: var(--sun); font-weight: 700; }
.tree .note{ color: #9fd87a; }

.quiz{ display: grid; gap: 14px; }
.qcard{ background: var(--panel); border: 2px solid var(--line); border-radius: var(--radius); padding: 14px 16px; }
.qcard .q{ font: 600 1.05rem var(--font-head); margin: 0 0 10px; }
.qcard .choices{ display: flex; gap: 10px; flex-wrap: wrap; }
.qcard button{ font: 700 1rem var(--font-head); padding: 8px 18px; border-radius: 999px; border: 2px solid var(--ink); background: var(--panel); color: var(--ink); cursor: pointer; }
.qcard button[data-choice="good"]:hover{ background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.qcard button[data-choice="slop"]:hover{ background: var(--danger); color: #fff; border-color: var(--danger); }
.qcard button:disabled{ cursor: default; opacity: 0.55; }
.qcard button.picked{ opacity: 1; outline: 3px solid var(--sun-deep); outline-offset: 2px; }
.qcard .verdict{ display: grid; grid-template-columns: 56px 1fr; gap: 10px; align-items: center; margin-top: 12px; }
.qcard .verdict img{ width: 56px; image-rendering: pixelated; }
.qcard.right{ border-color: var(--accent); }
.qcard.wrong{ border-color: var(--danger); }
.qcard .answer-key{ color: var(--muted); font-size: 0.95rem; }
.qcard.js .answer-key{ display: none; }
.score{ font: 700 1.1rem var(--font-head); }

footer{ padding: 40px 0 60px; color: var(--muted); text-align: center; border-top: 2px dashed var(--line); margin-top: 24px; }

.diagram svg .anim{ transform-box: fill-box; transform-origin: center; }
.d-panel{ fill: var(--panel); stroke: var(--line); stroke-width: 2; }
.d-panel2{ fill: var(--panel-2); }
.d-ink{ fill: var(--ink); }
.d-muted{ fill: var(--muted); }
.d-line{ stroke: var(--ink); stroke-width: 3; fill: none; stroke-linecap: round; stroke-linejoin: round; }
.d-dash{ stroke: var(--muted); stroke-width: 2; fill: none; stroke-dasharray: 6 6; }
.d-accent{ fill: var(--accent); }
.d-sun{ fill: var(--sun); }
.d-danger{ fill: var(--danger); }
.d-dangerline{ stroke: var(--danger); stroke-width: 6; stroke-linecap: round; fill: none; }
.d-white{ fill: #ffffff; }
.d-game{ fill: #2f6fb3; }
.d-land{ fill: #5aa43a; }
.d-sand{ fill: #e8d27a; }
.d-code{ fill: var(--code-bg); }
.d-text{ font: 700 15px var(--font-head); fill: var(--ink); }
.d-text.on-sun{ fill: #2a241c; }
.d-small{ font: 600 12px var(--font-body); fill: var(--muted); }
.d-label{ font: 700 13px var(--font-head); fill: #ffffff; }
.d-mono{ font: 600 12px var(--font-code); fill: var(--code-ink); }
.d-btn{ fill: var(--accent); }
.d-btn-text{ font: 700 13px var(--font-head); fill: var(--accent-ink); }
.d-tip{ fill: #1d1f24; stroke: #ffd23a; stroke-width: 2; }
.d-tip-text{ font: 700 16px var(--font-head); fill: #ffd23a; }
.scene.playing .anim.fly{ animation: pop 0.3s ease-out both, fly 1.1s ease-in-out both; animation-delay: var(--d, 0s), calc(var(--d, 0s) + 0.3s); }
.scene.done .anim.fly{ transform: translateX(var(--fly, 160px)); }
.scene.playing .bar-fill{ animation: fill 1.6s ease-out both; animation-delay: var(--d, 0s); }

@keyframes bounce{ 0%, 100%{ transform: translateY(0) scale(1, 1); } 50%{ transform: translateY(-6px) scale(1.02, 0.98); } }
@keyframes hop{ 0%, 100%{ transform: translateY(0); } 40%{ transform: translateY(-10px); } }
@keyframes thump{ 0%{ transform: rotate(-4deg) scale(2.2); opacity: 0; } 60%{ transform: rotate(-4deg) scale(0.92); opacity: 1; } 100%{ transform: rotate(-4deg) scale(1); } }
@keyframes pop{ 0%{ transform: scale(0.6); opacity: 0; } 100%{ transform: scale(1); opacity: 1; } }
@keyframes fly{ 0%{ transform: translateX(0); opacity: 1; } 100%{ transform: translateX(var(--fly, 160px)); opacity: 1; } }
@keyframes fill{ from{ width: 0; } to{ width: 100%; } }

.scene .anim{ opacity: 0; }
.scene:not(.js) .anim, .scene.done .anim{ opacity: 1; animation: none; }
.scene.playing .anim{ animation: pop 0.45s ease-out both; animation-delay: var(--d, 0s); }

@media (min-width: 720px){
    .stage{ grid-template-columns: 128px 1fr; }
    .wb{ width: 128px; }
    .scene{ grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); align-items: center; }
    .scene .replay{ grid-column: 1 / -1; }
    .grid-2, .compare{ grid-template-columns: 1fr 1fr; }
    .hero{ grid-template-columns: 1.4fr 1fr; }
}

@media (min-width: 1000px){
    .layout{ display: grid; grid-template-columns: 240px minmax(0, 1fr); gap: 36px; }
    .toc{ position: sticky; top: 16px; align-self: start; margin: 24px 0 0; padding: 12px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); }
    .toc ol{ flex-direction: column; overflow: visible; }
    .toc a{ white-space: normal; border-radius: 10px; background: transparent; border-color: transparent; }
}

@media (prefers-reduced-motion: reduce){
    *, *::before, *::after{ animation: none !important; transition: none !important; }
    .scene .anim{ opacity: 1; }
    html{ scroll-behavior: auto; }
}