/* さくっとコード ─ 共通の見た目。雪の白×空色×ももいろ。外部フォントは読まない */
:root {
  --bg: #fff9f2;
  --paper: #ffffff;
  --ink: #3b3540;
  --ink-soft: #7a7280;
  --line: #efe6dc;
  --sky: #5fb6e6;
  --sky-soft: #e4f4fd;
  --peach: #ff9b8a;
  --peach-soft: #ffece8;
  --lemon: #f2c84b;
  --lemon-soft: #fff6d9;
  --mint: #4fc4a0;
  --mint-soft: #e2f7ef;
  --ng: #e8697a;
  --ng-soft: #fdecef;
  --code-bg: #2f2b38;
  --code-ink: #f6f1ea;
  --radius: 18px;
  --shadow: 0 6px 0 rgba(59, 53, 64, .06), 0 10px 24px rgba(59, 53, 64, .06);
  --font: system-ui, "Hiragino Maru Gothic ProN", "Hiragino Sans", "BIZ UDPGothic", "Yu Gothic UI", "Meiryo", sans-serif;
  --mono: ui-monospace, "Cascadia Code", "Consolas", "BIZ UDGothic", "MS Gothic", monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #1f1c24; --paper: #2a2630; --ink: #f3eef6; --ink-soft: #b6adbd; --line: #3b3542;
    --sky-soft: #1f3442; --peach-soft: #43292a; --lemon-soft: #3f3721; --mint-soft: #1e3a31; --ng-soft: #45252c;
    --code-bg: #17151b;
  }
}
:root[data-theme="dark"] {
  --bg: #1f1c24; --paper: #2a2630; --ink: #f3eef6; --ink-soft: #b6adbd; --line: #3b3542;
  --sky-soft: #1f3442; --peach-soft: #43292a; --lemon-soft: #3f3721; --mint-soft: #1e3a31; --ng-soft: #45252c;
  --code-bg: #17151b;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
/* 等幅フォントの合字（</ が矢印のような1文字になる）を切る＝初心者が記号を1つずつ読めるように */
code, pre, textarea, .code, .gutter { font-variant-ligatures: none; font-feature-settings: "liga" 0, "calt" 0; }
html, body { margin: 0; }
body { background: var(--bg); color: var(--ink); font-family: var(--font); line-height: 1.7; -webkit-text-size-adjust: 100%; }
a { color: inherit; }
code { font-family: var(--mono); background: var(--sky-soft); padding: 0 .35em; border-radius: 6px; font-size: .92em; }
button { font: inherit; cursor: pointer; }

.topbar { display: flex; align-items: center; gap: 10px; padding: 10px 16px; background: var(--paper); border-bottom: 2px solid var(--line); position: sticky; top: 0; z-index: 5; }
.topbar .logo { display: flex; align-items: center; gap: 8px; font-weight: 800; text-decoration: none; font-size: 1.1rem; letter-spacing: .02em; }
.topbar .logo .mochi { width: 34px; height: 34px; }
.topbar .spacer { flex: 1; }
.streak { font-size: .85rem; background: var(--lemon-soft); border-radius: 999px; padding: 2px 12px; white-space: nowrap; }

.btn { display: inline-block; text-decoration: none; border: 0; border-radius: 999px; padding: 10px 22px; font-weight: 700; background: var(--sky); color: #fff; box-shadow: 0 4px 0 #3d93c4; transition: transform .08s; }
.btn:active { transform: translateY(3px); box-shadow: 0 1px 0 #3d93c4; }
.btn.peach { background: var(--peach); box-shadow: 0 4px 0 #e0745f; }
.btn.ghost { background: var(--paper); color: var(--ink); box-shadow: 0 3px 0 var(--line); border: 2px solid var(--line); }
.btn:disabled { opacity: .5; cursor: default; }

/* ── トップ ─────────────────────────── */
.hero { max-width: 980px; margin: 0 auto; padding: 32px 16px 8px; display: flex; gap: 20px; align-items: center; }
.hero h1 { margin: 0 0 6px; font-size: clamp(1.5rem, 4.5vw, 2.2rem); line-height: 1.35; }
.hero p { margin: 0; color: var(--ink-soft); }
.hero .mochi { flex: none; width: clamp(88px, 22vw, 140px); height: auto; animation: bob 3s ease-in-out infinite; }
@keyframes bob { 50% { transform: translateY(-6px); } }
@media (prefers-reduced-motion: reduce) { .hero .mochi { animation: none; } }

.map { max-width: 980px; margin: 0 auto; padding: 8px 16px 48px; display: grid; gap: 18px; grid-template-columns: repeat(auto-fit, minmax(min(100%, 440px), 1fr)); }
.course { background: var(--paper); border-radius: var(--radius); box-shadow: var(--shadow); padding: 18px 18px 8px; border-top: 8px solid var(--c); }
.course header { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.course h2 { margin: 0; font-size: 1.3rem; }
.course .tag { color: var(--ink-soft); font-size: .9rem; }
.course .count { margin-left: auto; font-size: .85rem; color: var(--ink-soft); }
.bar { height: 8px; background: var(--line); border-radius: 99px; margin: 8px 0 6px; overflow: hidden; }
.bar > i { display: block; height: 100%; background: var(--c); border-radius: 99px; }
.path { list-style: none; margin: 0; padding: 4px 0; }
.path li { position: relative; padding-left: 40px; }
.path li::before { content: ""; position: absolute; left: 15px; top: 0; bottom: 0; border-left: 3px dotted var(--line); }
.path li:first-child::before { top: 50%; } .path li:last-child::before { bottom: 50%; }
.step { display: flex; align-items: center; gap: 8px; padding: 9px 10px; border-radius: 12px; text-decoration: none; }
a.step:hover { background: var(--cs); }
.step .dot { position: absolute; left: 6px; width: 22px; height: 22px; border-radius: 50%; background: var(--paper); border: 3px solid var(--c); display: grid; place-items: center; font-size: 12px; color: #fff; z-index: 1; }
.step.done .dot { background: var(--c); }
.step.soon { color: var(--ink-soft); }
.step.soon .dot { border-color: var(--line); }
.step .min { margin-left: auto; font-size: .8rem; color: var(--ink-soft); white-space: nowrap; }
.step .badge { font-size: .72rem; background: var(--line); border-radius: 99px; padding: 0 8px; white-space: nowrap; }
.c-sky { --c: var(--sky); --cs: var(--sky-soft); } .c-peach { --c: var(--peach); --cs: var(--peach-soft); }
.c-lemon { --c: var(--lemon); --cs: var(--lemon-soft); } .c-mint { --c: var(--mint); --cs: var(--mint-soft); }
footer.site { text-align: center; color: var(--ink-soft); font-size: .8rem; padding: 16px; }

/* ── レッスン：説明スライド ───────────── */
.slides { max-width: 1120px; margin: 0 auto; padding: 20px 16px 40px; }
.crumb { font-size: .85rem; color: var(--ink-soft); margin-bottom: 8px; }
.card { background: var(--paper); border-radius: var(--radius); box-shadow: var(--shadow); padding: 22px; min-height: 340px; }
.card h2 { margin: 0 0 10px; font-size: 1.35rem; }
.card pre, .code { background: var(--code-bg); color: var(--code-ink); font-family: var(--mono); border-radius: 12px; padding: 14px 16px; overflow-x: auto; white-space: pre; font-size: .95rem; line-height: 1.6; }
.say { display: flex; gap: 10px; align-items: flex-start; margin-top: 14px; }
.say .mochi { flex: none; width: 54px; height: 54px; }
.bubble { position: relative; background: var(--sky-soft); border-radius: 14px; padding: 8px 12px; font-size: .95rem; }
.bubble::before { content: ""; position: absolute; left: -8px; top: 16px; border: 8px solid transparent; border-right-color: var(--sky-soft); border-left: 0; }
.bubble.ng { background: var(--ng-soft); } .bubble.ng::before { border-right-color: var(--ng-soft); }
.bubble.ok { background: var(--mint-soft); } .bubble.ok::before { border-right-color: var(--mint-soft); }
.nav { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-top: 16px; }
.dots { display: flex; gap: 6px; } .dots i { width: 9px; height: 9px; border-radius: 50%; background: var(--line); } .dots i.on { background: var(--sky); }

/* ── レッスン：手を動かす ─────────────── */
.work { display: grid; grid-template-columns: minmax(240px, 300px) minmax(0, 1fr) minmax(0, 1fr); gap: 12px; padding: 12px 16px 24px; height: calc(100dvh - 58px); min-height: 520px; }
.panel { background: var(--paper); border-radius: var(--radius); box-shadow: var(--shadow); display: flex; flex-direction: column; min-height: 0; overflow: hidden; }
.panel > h3 { margin: 0; padding: 10px 14px; font-size: .9rem; border-bottom: 2px solid var(--line); display: flex; align-items: center; gap: 8px; }
.panel .body { padding: 12px 14px; overflow: auto; flex: 1; min-height: 0; }
.task ol { padding-left: 1.3em; margin: .3em 0; }
.checks { list-style: none; padding: 0; margin: 10px 0 0; font-size: .9rem; }
.checks li { display: flex; gap: 8px; align-items: flex-start; padding: 5px 0; }
.checks .mark { flex: none; width: 20px; height: 20px; border-radius: 50%; border: 2px solid var(--line); display: grid; place-items: center; font-size: 12px; font-weight: 800; margin-top: 2px; }
.checks li[data-ok="true"] .mark { background: var(--mint); border-color: var(--mint); color: #fff; }
.checks li[data-ok="false"] .mark { background: var(--ng); border-color: var(--ng); color: #fff; }
.editor { display: flex; flex: 1; min-height: 0; background: var(--code-bg); }
.editor .gutter { padding: 12px 6px 12px 10px; color: #8d8598; text-align: right; font-family: var(--mono); font-size: .95rem; line-height: 1.6; user-select: none; white-space: pre; overflow: hidden; }
.editor textarea { flex: 1; min-width: 0; border: 0; outline: none; resize: none; padding: 12px; background: transparent; color: var(--code-ink); font-family: var(--mono); font-size: .95rem; line-height: 1.6; tab-size: 2; white-space: pre; overflow: auto; }
.toolbar { display: flex; gap: 8px; padding: 10px; border-top: 2px solid var(--line); flex-wrap: wrap; align-items: center; }
.toolbar .kbd { font-size: .75rem; color: var(--ink-soft); margin-left: auto; }
iframe.preview { flex: 1; width: 100%; border: 0; background: #fff; min-height: 0; }
.answer { margin-top: 10px; }




.btn.mint { background: var(--mint); box-shadow: 0 4px 0 #36a07f; }
.btn.small { padding: 6px 16px; font-size: .9rem; }
.btn.big { padding: 12px 26px; font-size: 1.05rem; }
.btn.pulse { animation: pulse 1.4s ease-in-out 3; }
@keyframes pulse { 50% { transform: scale(1.07); } }
kbd { font-family: var(--mono); font-size: .85em; border: 1px solid var(--line); border-bottom-width: 3px; border-radius: 6px; padding: 0 .4em; background: var(--paper); }
.tip { font-size: .85rem; color: var(--ink-soft); background: var(--lemon-soft); border-radius: 10px; padding: 6px 10px; }

/* ── 説明スライド：左＝説明とコード／右＝本物のブラウザ ── */
.card.slide.two { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); gap: 22px; align-items: start; }
.code-label { font-size: .75rem; color: var(--ink-soft); margin: 12px 0 -4px; font-family: var(--mono); }
.stage { min-height: 300px; }
.stage .browser { height: 340px; }
.stage .terminal { height: 260px; }

/* ── ブラウザの窓（絵ではなく、中は本当に描画している） ── */
.browser { display: flex; flex-direction: column; border-radius: 12px; overflow: hidden; border: 1px solid #d6d1cc; background: #fff; box-shadow: 0 8px 24px rgba(59, 53, 64, .12); height: 100%; min-height: 0; }
.b-top { display: flex; align-items: flex-end; gap: 10px; background: #e8e4e1; padding: 8px 10px 0; }
.b-lights { display: inline-flex; gap: 6px; padding-bottom: 9px; }
.b-lights i { width: 11px; height: 11px; border-radius: 50%; background: #ff6159; } .b-lights i:nth-child(2) { background: #ffbd2e; } .b-lights i:nth-child(3) { background: #28c941; }
.b-tab { display: inline-flex; align-items: center; gap: 7px; background: #fff; border-radius: 9px 9px 0 0; padding: 6px 12px; font-size: .78rem; color: #333; max-width: 60%; min-width: 0; }
.b-title { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.b-favicon { flex: none; width: 13px; height: 13px; border-radius: 3px; background: linear-gradient(135deg, #9fd3f2, #5fb6e6); }
.b-x { color: #999; margin-left: 4px; }
.b-addr { display: flex; align-items: center; gap: 10px; padding: 6px 10px; border-bottom: 1px solid #eee; background: #fff; font-size: .78rem; color: #555; }
.b-nav { color: #aaa; letter-spacing: .3em; white-space: nowrap; }
.b-url { flex: 1; min-width: 0; background: #f1efed; border-radius: 99px; padding: 3px 12px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.b-chip { color: #777; border-right: 1px solid #ccc; padding-right: 8px; margin-right: 8px; }
.b-peek { display: flex; gap: 4px; padding: 6px 10px; background: #faf8f6; border-bottom: 1px solid #eee; }
.b-peek button { border: 1px solid #ddd; background: #fff; border-radius: 99px; padding: 2px 12px; font-size: .8rem; color: #555; }
.b-peek button.on { background: var(--sky); border-color: var(--sky); color: #fff; }
.b-body { flex: 1; min-height: 0; display: flex; }
.b-body iframe.preview { flex: 1; width: 100%; border: 0; background: #fff; }
.b-src { flex: 1; margin: 0; overflow: auto; background: #fff; color: #1d1d1f; font-family: var(--mono); font-size: .85rem; line-height: 1.6; padding: 12px; white-space: pre-wrap; }
.b-console { border-top: 1px solid #ddd; background: #fbfbfb; height: 38%; min-height: 90px; display: flex; flex-direction: column; }
.b-console-head { font-size: .72rem; color: #666; padding: 3px 10px; border-bottom: 1px solid #eee; background: #f3f3f3; }
.b-logs { overflow: auto; flex: 1; font-family: var(--mono); font-size: .85rem; }
.b-log { padding: 2px 10px; border-bottom: 1px solid #f0f0f0; color: #222; white-space: pre-wrap; }
.b-log.err { color: #c62f3f; background: #fff0f1; } .b-log.dim { color: #999; }

/* ── Python の黒い画面 ── */
.terminal { display: flex; flex-direction: column; border-radius: 12px; overflow: hidden; background: #1e1b24; box-shadow: 0 8px 24px rgba(59, 53, 64, .15); height: 100%; min-height: 0; }
.t-head { display: flex; align-items: center; gap: 12px; padding: 8px 12px 0; font-size: .75rem; color: #aaa; }
.t-head .b-lights { padding-bottom: 6px; }
.t-body { flex: 1; margin: 0; padding: 10px 14px; overflow: auto; color: #f1ecf5; font-family: var(--mono); font-size: .92rem; line-height: 1.6; white-space: pre-wrap; }
.t-prompt { color: #7fd4b0; } .t-err { color: #ff8f9c; } .t-dim { color: #8d8598; }

/* ── 手を動かす：タブ・出力・クリア演出 ── */
.tabs { display: flex; gap: 2px; padding: 6px 8px 0; border-bottom: 2px solid var(--line); overflow-x: auto; }
.tab { border: 0; background: transparent; padding: 6px 12px; border-radius: 10px 10px 0 0; font-size: .82rem; font-family: var(--mono); color: var(--ink-soft); white-space: nowrap; }
.tab.on { background: var(--code-bg); color: var(--code-ink); }
.tab small { font-family: var(--font); opacity: .7; }
.editor textarea[readonly] { color: #b9b1c4; }
.panel.out { padding: 10px; background: transparent; box-shadow: none; }
.checks li.pop { animation: pop .45s cubic-bezier(.2, 1.6, .4, 1) both; animation-delay: var(--d); }
@keyframes pop { from { transform: scale(.6); opacity: 0; } }
.cleared { margin-top: 10px; border-radius: 14px; background: var(--mint-soft); padding: 8px 14px; text-align: center; }
.cleared.show { animation: pop .5s cubic-bezier(.2, 1.6, .4, 1) .2s both; }
.cleared-title { margin: 0; font-weight: 800; font-size: 1.2rem; }
.cleared-msg { margin: 0; font-size: .9rem; }
.say .bubble.ok + * , .say:has(.ok) .mochi { animation: hop .5s ease 2; }
@keyframes hop { 50% { transform: translateY(-8px); } }
canvas.confetti { position: fixed; inset: 0; width: 100%; height: 100%; pointer-events: none; z-index: 30; display: none; }
@media (prefers-reduced-motion: reduce) { .checks li.pop, .cleared.show, .btn.pulse, .say:has(.ok) .mochi { animation: none; } }

@media (max-width: 900px) {
  .card.slide.two { grid-template-columns: minmax(0, 1fr); }
  .stage .browser { height: 280px; }
  .work { grid-template-columns: 1fr; height: auto; }
  .panel.edit { height: 52vh; min-height: 300px; }
  .panel.out { height: 46vh; min-height: 260px; padding: 0; }
}
.topbar .up { font-size: .8rem; color: var(--ink-soft); text-decoration: none; border-left: 2px solid var(--line); padding-left: 10px; white-space: nowrap; }
.b-console.tall { height: 72%; }
@media (max-width: 900px) { .tip.tab-tip { display: none; } } /* スマホには Tab キーが無い */