/* Java 問題集 — 絵以外はできるだけ簡素に */
:root {
  --font: "Zen Kaku Gothic New", "Hiragino Sans", "Noto Sans JP", "Meiryo", sans-serif;
  --mono: "JetBrains Mono", "BIZ UDGothic", ui-monospace, Consolas, monospace;
  --ink: #1a1d24;
  --ink-2: #5b6170;
  --ink-3: #8a909c;
  --line: #e4e4e7;
  --line-2: #d0d0d6;
  --soft: #f6f6f7;
  --a: #c8432f; --b: #2e5fbf; --c: #1f8a68;
  --ok: #1d8a4f; --ng: #c73a2c;
  --gold: #e9b52c;
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 72px; }
body { margin: 0; font-family: var(--font); font-size: 16px; line-height: 1.8; letter-spacing: .02em; color: var(--ink); background: #fff; -webkit-font-smoothing: antialiased; }
h1, h2, h3 { margin: 0; font-weight: 700; letter-spacing: .01em; word-break: auto-phrase; }
p { margin: 0; }
a { color: inherit; }
img, svg { display: block; max-width: 100%; }
button { font: inherit; }
code { font-family: var(--mono); font-size: .9em; background: var(--soft); padding: 1px 6px; border-radius: 4px; }
textarea, pre, code, .input, .mono, .il .mono { font-variant-ligatures: none; font-feature-settings: "liga" 0, "calt" 0; }
:focus-visible { outline: 2px solid var(--ink); outline-offset: 2px; }

/* ヘッダー */
.top { position: sticky; top: 0; z-index: 10; display: flex; align-items: center; gap: 14px; height: 56px; padding: 0 20px; background: #fff; border-bottom: 1px solid var(--line); }
.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 700; }
.logo svg { width: 28px; height: 28px; }
.crumb { font-size: 14px; color: var(--ink-3); }
.crumb a { text-decoration: none; }
.crumb a:hover { color: var(--ink); }

.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px 96px; }
@media (max-width: 599px) { .wrap { padding: 0 16px 80px; } .top { padding: 0 16px; } }

/* 表紙 */
.stage { margin-top: 28px; border-radius: 12px; overflow: hidden; }
.title { margin-top: 24px; }
.title small { display: block; font-size: 14px; color: var(--ink-3); }
.title h1 { font-size: 32px; line-height: 1.35; margin-top: 2px; }
.name { display: flex; align-items: center; gap: 10px; margin-top: 18px; font-size: 14px; color: var(--ink-2); }
.name .input { max-width: 240px; }

/* 節 */
.part { margin-top: 64px; }
.part > h2 { font-size: 22px; padding-bottom: 10px; border-bottom: 2px solid var(--ink); }
.story { margin-top: 18px; color: var(--ink-2); }
.story p + p, .story blockquote + p { margin-top: 8px; }
.story blockquote { margin: 10px 0; padding: 2px 0 2px 14px; border-left: 3px solid var(--ink); color: var(--ink); font-weight: 700; }
.story blockquote.a { border-color: var(--a); }
.story blockquote.b { border-color: var(--b); }
.story blockquote.c { border-color: var(--c); }
.fig { margin: 20px 0 0; }
.fig + .fig { margin-top: 12px; }
.fig__scroll { overflow-x: auto; }
.fig__scroll > svg { min-width: 600px; }
.fig--box { padding: 14px; border: 1px solid var(--line); border-radius: 10px; }
.formula { margin-top: 12px; font-size: 14px; color: var(--ink-2); }

.il { display: block; width: 100%; height: auto; overflow: visible; }
.il text { font-family: var(--font); font-weight: 700; fill: var(--ink); letter-spacing: 0; }
.il .tn { font-weight: 500; fill: var(--ink-2); }
.il .tw { fill: #fff; }
.il .ta { fill: #9b2c1c; } .il .tb { fill: #1f458f; } .il .tc { fill: #156549; }
.il .tg { fill: #8a6200; }
.il .mono { font-family: var(--mono); }

/* 宝物の表 */
.vault { width: 100%; margin-top: 16px; border-collapse: collapse; font-variant-numeric: tabular-nums; }
.vault th, .vault td { padding: 8px 10px; border-bottom: 1px solid var(--line); text-align: left; }
.vault thead th { font-size: 13px; color: var(--ink-3); font-weight: 500; }
.vault .num { text-align: right; white-space: nowrap; font-family: var(--mono); }
.vault .num span { font-family: var(--font); font-size: 12px; color: var(--ink-3); margin-left: 2px; }
.gem { display: flex; align-items: center; gap: 10px; font-weight: 700; }
.gem svg { width: 36px; height: 36px; }

/* 問題 */
.q { padding: 32px 0 8px; border-bottom: 1px solid var(--line); scroll-margin-top: 64px; }
.q__head { display: grid; grid-template-columns: 32px 1fr auto; gap: 12px; align-items: start; }
.q__num { display: grid; place-items: center; width: 32px; height: 32px; border-radius: 8px; background: var(--k, var(--ink)); color: #fff; font-weight: 700; font-family: var(--mono); }
.q--a { --k: var(--a); } .q--b { --k: var(--b); } .q--c { --k: var(--c); }
.q__text { font-weight: 700; font-size: 17px; line-height: 1.7; padding-top: 2px; }
.q__note { margin-top: 4px; font-size: 14px; font-weight: 400; color: var(--ink-2); }
.q__pts { font-size: 13px; color: var(--ink-3); white-space: nowrap; padding-top: 6px; font-variant-numeric: tabular-nums; }
.q__pts b { font-weight: 700; color: var(--ink); }
.q.is-full .q__pts b { color: var(--ok); }
.q.is-zero .q__pts b, .q.is-part .q__pts b { color: var(--ng); }
.q__body { padding-left: 44px; }
@media (max-width: 599px) { .q__body { padding-left: 0; } }

.field { margin-top: 18px; }
.field__label { display: block; margin-bottom: 6px; font-size: 13px; color: var(--ink-3); }
.input { display: block; width: 100%; height: 44px; padding: 0 12px; font: inherit; font-size: 16px; color: var(--ink); background: #fff; border: 1px solid var(--line-2); border-radius: 6px; }
.input:focus { outline: none; border-color: var(--ink); }
.unit { display: flex; align-items: center; gap: 8px; max-width: 360px; }
.unit .input { font-family: var(--mono); }
.unit span { color: var(--ink-2); white-space: nowrap; }
.unit--s { max-width: 200px; }
.calls { display: grid; gap: 8px; }
.call { display: grid; grid-template-columns: 130px minmax(0, 1fr); align-items: center; gap: 10px; }
.call code { background: none; padding: 0; font-size: 15px; }
.call .unit { max-width: none; }

.editor { display: grid; grid-template-columns: auto minmax(0, 1fr); border: 1px solid var(--line-2); border-radius: 6px; background: var(--soft); overflow: hidden; }
.editor:focus-within { border-color: var(--ink); }
.editor__nums { margin: 0; padding: 10px 8px 10px 12px; text-align: right; color: #b0b4bd; font-family: var(--mono); font-size: 14px; line-height: 1.7; user-select: none; white-space: pre; }
.editor textarea { display: block; width: 100%; min-height: 120px; margin: 0; padding: 10px 12px; border: 0; outline: 0; resize: none; overflow-x: auto; overflow-y: hidden; background: transparent; color: var(--ink); font-family: var(--mono); font-size: 14px; line-height: 1.7; letter-spacing: 0; white-space: pre; tab-size: 4; }
.editor textarea::placeholder { color: #b0b4bd; }

.picks { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 8px; }
.pick { display: flex; align-items: center; gap: 8px; padding: 6px 10px; border: 1px solid var(--line-2); border-radius: 8px; cursor: pointer; font-weight: 700; }
.pick input { position: absolute; opacity: 0; pointer-events: none; }
.pick svg { width: 40px; height: 40px; flex-shrink: 0; }
.pick:hover { border-color: var(--ink-3); }
.pick:has(input:checked) { border-color: var(--k); box-shadow: inset 0 0 0 1px var(--k); background: #f2f8f5; }
.pick:has(input:focus-visible) { outline: 2px solid var(--ink); outline-offset: 2px; }

/* 採点の結果 */
.res { margin-top: 16px; padding: 4px 0; font-size: 14px; }
.res li { list-style: none; display: grid; grid-template-columns: 20px 1fr auto; gap: 8px; padding: 4px 0; }
.res ul { margin: 0; padding: 0; }
.res__m { font-weight: 700; }
li.ok .res__m { color: var(--ok); }
li.ng .res__m { color: var(--ng); }
.res__n { display: block; color: var(--ng); }
.res__p { color: var(--ink-3); font-variant-numeric: tabular-nums; }
.sol { margin-top: 12px; padding: 12px 14px; border: 1px solid var(--line); border-radius: 8px; font-size: 14px; }
.sol__ans { font-weight: 700; }
.sol__text { margin-top: 4px; color: var(--ink-2); }
.sol__text p + p { margin-top: 4px; }
pre.java { margin: 10px 0 0; padding: 10px 12px; overflow-x: auto; background: var(--soft); border-radius: 6px; font-family: var(--mono); font-size: 13px; line-height: 1.7; letter-spacing: 0; tab-size: 4; }
pre.java .k { color: #b5420f; } pre.java .t { color: #1f6fb2; } pre.java .n { color: #9a6700; }
pre.java .s { color: #2f7d32; } pre.java .c { color: #9097a3; } pre.java .f { color: #7a3fb0; }

/* 採点ボタンと成績 */
.submit { display: flex; flex-wrap: wrap; align-items: center; gap: 16px; margin-top: 48px; }
.btn { display: inline-flex; align-items: center; justify-content: center; height: 48px; padding: 0 28px; border: 1px solid var(--ink); border-radius: 8px; background: var(--ink); color: #fff; font-weight: 700; cursor: pointer; text-decoration: none; }
.btn:hover { background: #2d323d; }
.btn:disabled { opacity: .5; cursor: wait; }
.link { border: 0; background: none; padding: 0; color: var(--ink-2); text-decoration: underline; text-underline-offset: 3px; cursor: pointer; font-size: 14px; }
.status { font-size: 14px; color: var(--ng); }

.board { margin-top: 24px; padding: 24px; border: 1px solid var(--line); border-radius: 10px; scroll-margin-top: 72px; }
.board__score { font-family: var(--mono); font-size: 48px; font-weight: 700; line-height: 1; }
.board__score span { font-family: var(--font); font-size: 16px; color: var(--ink-3); margin-left: 6px; }
.board__meta { margin-top: 8px; font-size: 13px; color: var(--ink-3); }
.board__rows { margin-top: 16px; border-top: 1px solid var(--line); }
.brow { display: grid; grid-template-columns: 40px 1fr 60px; gap: 8px; padding: 6px 0; border-bottom: 1px solid var(--line); font-size: 14px; text-decoration: none; }
.brow b { font-family: var(--mono); }
.brow__pts { text-align: right; font-variant-numeric: tabular-nums; }
.brow__pts.full { color: var(--ok); }
.brow__pts.miss { color: var(--ng); }
.board__foot { display: flex; gap: 20px; margin-top: 14px; }

.toast { position: fixed; left: 50%; bottom: 20px; transform: translateX(-50%); padding: 8px 16px; border-radius: 6px; background: var(--ink); color: #fff; font-size: 14px; opacity: 0; transition: opacity .2s; pointer-events: none; }
.toast.is-on { opacity: 1; }

/* トップ */
.home-head { display: grid; grid-template-columns: 1fr 300px; gap: 32px; align-items: center; padding: 40px 0 8px; }
.home-head h1 { font-size: 36px; }
@media (max-width: 699px) { .home-head { grid-template-columns: 1fr; } .home-head__art { max-width: 340px; } }
.home-grid { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 24px; margin-top: 32px; align-items: start; }
@media (max-width: 799px) { .home-grid { grid-template-columns: 1fr; } }
.home-wrap { max-width: 1000px; }
.tcard { display: grid; grid-template-columns: 300px 1fr; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; text-decoration: none; }
.tcard:hover { border-color: var(--ink-3); }
.tcard__art { height: 220px; overflow: hidden; }
@media (max-width: 599px) { .tcard { grid-template-columns: 1fr; } }
.tcard__art svg { width: 100%; height: 100% !important; }
.tcard__body { padding: 20px; align-self: center; }
.tcard__date { font-size: 13px; color: var(--ink-3); }
.tcard h3 { font-size: 20px; margin-top: 2px; }
.tcard__best { font-size: 13px; color: var(--ok); }
.cal { border: 1px solid var(--line); border-radius: 10px; padding: 12px; }
.cal__head { display: flex; align-items: center; justify-content: space-between; font-weight: 700; padding: 0 4px 8px; }
.cal__nav button { width: 28px; height: 28px; border: 1px solid var(--line); border-radius: 6px; background: #fff; cursor: pointer; }
.cal__nav button:disabled { opacity: .3; cursor: default; }
.cal__grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 2px; text-align: center; }
.cal__dow { font-size: 12px; color: var(--ink-3); }
.cal__d { display: grid; place-items: center; aspect-ratio: 1; border-radius: 6px; font-size: 14px; color: var(--ink-2); text-decoration: none; }
.cal__d.out { visibility: hidden; }
.cal__d.today { box-shadow: inset 0 0 0 1px var(--ink-3); }
a.cal__d { background: var(--ink); color: #fff; font-weight: 700; }
a.cal__d:hover { background: #2d323d; }

@media print {
  .top, .no-print, .toast { display: none !important; }
  .wrap { max-width: none; padding: 0; }
  .q { break-inside: avoid; }
}