:root{color-scheme:light;--paper:#faf7ef;--ink:#314b40;--muted:#636c61;--green:#365e4c;--line:#dfdfd1;--orange:#af582e;--rounded:'M PLUS Rounded 1c','Hiragino Maru Gothic ProN',sans-serif}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:32px}
body{margin:0;background:var(--paper);color:var(--ink);font-family:'Hiragino Kaku Gothic ProN','Yu Gothic',Meiryo,sans-serif;font-size:16px;line-height:1.95;letter-spacing:.025em;overflow-wrap:anywhere}
a{color:inherit;text-underline-offset:5px}img{max-width:100%;height:auto;display:block}svg{display:block;fill:none;stroke:currentColor;stroke-width:1.65;stroke-linecap:round;stroke-linejoin:round}
:focus-visible{outline:3px solid #b85a28;outline-offset:5px;border-radius:3px}
.wrap{width:min(1080px,calc(100% - 80px));margin-inline:auto}
.page-header{display:flex;align-items:center;justify-content:space-between;gap:20px;padding-block:27px;border-bottom:1px solid var(--line)}
.brand{display:flex;gap:12px;align-items:center;text-decoration:none;font-family:var(--rounded);font-weight:700;letter-spacing:.04em}.brand img{width:42px;height:42px;object-fit:contain;border-radius:12px}
.back-link{font-size:13px;text-decoration:none;white-space:nowrap;display:flex;gap:14px;align-items:center;padding:8px 0}.back-link span{font-size:22px}
.hero{display:grid;grid-template-columns:1.1fr 1fr;align-items:center;gap:55px;padding-block:68px 72px}
.eyebrow{font-family:var(--rounded);font-weight:700;font-size:13px;letter-spacing:.12em;color:var(--orange);margin:0 0 20px}.eyebrow span{margin-right:5px;font-size:20px;vertical-align:middle}
h1,h2,h3{font-family:var(--rounded);font-weight:700;letter-spacing:.025em;text-wrap:pretty}h1{font-size:clamp(36px,4.5vw,54px);line-height:1.55;margin:0 0 25px;letter-spacing:.055em}h2{font-size:28px;line-height:1.8;margin:0 0 22px}h3{font-size:17px;line-height:1.7;margin:0 0 7px}
.sunny-word{background:linear-gradient(transparent 72%,#efd797 72%,#efd797 94%,transparent 94%)}.hero-lead{font-size:18px;line-height:1.9;margin:0 0 14px}.hero-note{font-size:14px;color:var(--muted);margin:0 0 24px}.text-link{font-size:14px;font-weight:700;display:inline-flex;gap:16px;align-items:center;min-height:44px}
.hero-art{position:relative;padding:30px 8px 100px}.adventure-picture{background:#fffdf6;border:1px solid #e6ddc6;padding:14px 14px 0;box-shadow:0 12px 30px #4c523912;transform:rotate(3deg);border-radius:5px}.adventure-picture img{width:100%;aspect-ratio:3/2;object-fit:contain;object-position:50% 50%;border-radius:2px}.picture-caption{display:block;text-align:center;font-family:var(--rounded);font-weight:700;font-size:13px;padding:15px 0 19px;letter-spacing:.045em}
.art-sun{position:absolute;right:4px;top:-30px;color:#c18a37;font-size:75px;line-height:1}.art-spark{position:absolute;left:-25px;top:35px;color:#799b7b;font-size:45px}.little-note{position:absolute;bottom:3px;left:-27px;transform:rotate(-5deg);padding:16px 24px;background:#f4e4b8;box-shadow:0 7px 12px #4c523912;display:flex;align-items:center;gap:15px;font-family:var(--rounded);font-size:15px;font-weight:700;line-height:1.85}.note-flower{color:#b7633b;font-size:35px}
.promises{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:26px 0;gap:20px}.promises>div{display:flex;align-items:center;gap:15px;padding-inline:8px}.promises>div+div{border-left:1px solid var(--line);padding-left:24px}.promises svg{width:35px;height:35px;flex-shrink:0;color:#47705a}.promises p{margin:0;line-height:1.7}.promises strong{display:block;font-family:var(--rounded);font-weight:700;font-size:16px}.promises p span{display:block;font-size:12px;margin-top:4px;color:var(--muted)}
.letter{display:grid;grid-template-columns:.8fr 1.5fr;gap:64px;padding:85px 55px 75px;position:relative}.letter-heading h2{font-size:32px;margin-bottom:15px}.teacher-label{font-size:12px;padding:5px 13px;border:1px solid #cdd5c4;border-radius:4px;color:#596950}.letter-mark{margin-top:56px;width:140px;height:140px;border:1px solid #b8c9ad;border-radius:50%;display:grid;place-content:center;text-align:center;transform:rotate(-10deg);font-family:var(--rounded);font-weight:700;font-size:17px;color:#6a805e;line-height:1.85;background:#edf0e4}.letter-body p{margin:0 0 22px;font-size:15px;line-height:2.15}.letter-body strong{font-weight:700;color:#314d3d}.letter-body .signature{text-align:right;font-family:var(--rounded);font-size:26px;font-weight:700;letter-spacing:.15em;margin:28px 0 0}.signature span{font-family:'Hiragino Kaku Gothic ProN',Meiryo,sans-serif;display:block;font-weight:400;font-size:11px;letter-spacing:.04em;color:var(--muted);margin-bottom:2px}
.play-together{background:#eaf0e4;border-radius:12px;padding:45px 50px;display:grid;grid-template-columns:1fr 1.05fr;gap:50px}.section-intro .eyebrow{color:#55724b;margin-bottom:14px}.section-intro h2{font-size:25px}.section-intro>p:last-child{font-size:14px;margin:0;color:#596651}.play-tips{margin:0;padding:0;list-style:none}.play-tips li{display:flex;gap:15px;padding:20px 0;border-bottom:1px solid #cfdbc7}.play-tips li:first-child{padding-top:0}.play-tips li:last-child{border:0;padding-bottom:0}.tip-number{font-family:var(--rounded);font-weight:700;color:#6a805e;font-size:23px;line-height:1.3}.play-tips p{font-size:13px;line-height:1.9;color:#52614b;margin:0}.play-tips h3{font-size:15px}
.questions{max-width:800px;padding-block:76px 65px}.questions .eyebrow{margin-bottom:10px}.questions h2{margin-bottom:28px}.questions details{border-top:1px solid var(--line)}.questions details:last-child{border-bottom:1px solid var(--line)}.questions summary{font-family:var(--rounded);font-weight:700;font-size:15px;display:flex;justify-content:space-between;gap:20px;align-items:center;cursor:pointer;padding:24px 4px;list-style:none;line-height:1.8}.questions summary::-webkit-details-marker{display:none}.questions summary::after{content:'＋';font-family:system-ui;font-size:21px;color:#6b7d60;flex-shrink:0}.questions details[open] summary::after{content:'−'}.questions details>div{font-size:14px;line-height:2;padding:0 30px 22px 4px;color:#566052}.questions details p{margin:0 0 12px}.questions details p:last-child{margin-bottom:0}
.closing{text-align:center;padding:30px 0 72px}.closing-flower{display:block;color:#b96d45;font-size:39px;margin-bottom:10px}.closing h2{font-size:27px;line-height:1.85}.closing p{font-size:14px;color:var(--muted)}.primary-link{margin-top:16px;background:var(--green);color:#fffdf4;display:inline-flex;align-items:center;gap:30px;padding:15px 30px;border-radius:40px;text-decoration:none;font-family:var(--rounded);font-size:15px;font-weight:700;box-shadow:0 4px 0 #d1dac9;transition:background .2s,transform .2s}.primary-link:hover{background:#284b3b;transform:translateY(-2px)}.closing .closing-note{font-size:12px;margin-top:20px}
.page-footer{border-top:1px solid var(--line);padding-block:24px 32px;display:flex;justify-content:space-between;gap:22px;color:var(--muted);font-size:11px}.page-footer nav{display:flex;gap:24px}.page-footer a{display:inline-block;padding:5px 0}.skip-link{position:absolute;left:16px;top:-100px;padding:10px 20px;background:white;z-index:2}.skip-link:focus{top:10px}
@media(max-width:900px){.wrap{width:calc(100% - 48px)}.hero{gap:30px;padding-block:48px}.hero-art{padding-inline:0}.little-note{left:-10px;font-size:13px;padding:12px 18px}.promises{gap:12px}.promises>div{gap:9px;padding-inline:0}.promises>div+div{padding-left:14px}.promises svg{width:27px;height:27px}.promises strong{font-size:13px}.promises p span{font-size:11px}.letter{padding:60px 15px;gap:35px;grid-template-columns:.8fr 1.4fr}.letter-heading h2{font-size:28px}.play-together{padding:32px;gap:30px}.section-intro h2{font-size:23px}}
@media(max-width:620px){body{font-size:15px}.wrap{width:calc(100% - 40px)}.page-header{padding-block:18px;gap:12px}.brand{gap:8px;font-size:12px;letter-spacing:0}.brand img{width:32px;height:32px}.back-link{font-size:12px;gap:5px}.back-link span{font-size:18px}.hero{grid-template-columns:1fr;gap:24px;padding-block:35px 30px}.eyebrow{font-size:12px;margin-bottom:16px}h1{font-size:39px;line-height:1.5}.hero-lead{font-size:16px}.hero-note{font-size:13px}.hero-art{width:min(350px,92%);margin-inline:auto;padding-top:20px;padding-bottom:110px}.adventure-picture img{aspect-ratio:3/2}.art-sun{font-size:56px;top:-10px;right:-8px}.art-spark{font-size:34px;left:-18px}.little-note{bottom:6px;left:-5px;font-size:12px;padding:10px 18px;gap:12px}.note-flower{font-size:29px}.picture-caption{font-size:11px;padding-block:12px 16px}.promises{grid-template-columns:1fr;padding-block:7px;gap:0}.promises>div,.promises>div+div{border-left:0;padding:15px 5px;gap:17px}.promises>div+div{border-top:1px dashed var(--line)}.promises svg{width:29px;height:29px}.promises strong{font-size:15px}.promises p span{font-size:12px}.letter{grid-template-columns:1fr;padding:46px 0 42px;gap:27px}.letter-heading{position:relative}.letter-heading h2{font-size:28px;line-height:1.6}.letter-mark{position:absolute;right:3px;bottom:4px;width:103px;height:103px;font-size:13px;margin:0}.letter-body p{font-size:14px;line-height:2.1;margin-bottom:20px}.letter-body .signature{font-size:25px}.play-together{grid-template-columns:1fr;gap:28px;padding:28px 22px}.section-intro h2{font-size:23px}.section-intro>p:last-child{font-size:13px}.play-tips h3{font-size:14px}.questions{padding-block:45px 30px}.questions h2{font-size:24px;margin-bottom:20px}.questions summary{font-size:14px;padding-block:21px;gap:12px}.questions details>div{font-size:13px;padding-right:8px}.closing{padding:20px 0 42px}.closing h2{font-size:22px}.closing p{font-size:13px}.primary-link{font-size:14px;padding:14px 24px;gap:24px}.page-footer{flex-direction:column;align-items:center;gap:8px;text-align:center}.desktop-break{display:none}}
@media(max-width:350px){.wrap{width:calc(100% - 32px)}h1{font-size:35px}.letter-mark{width:86px;height:86px;font-size:11px}.letter-heading h2{font-size:26px}.brand{font-size:11px}.brand img{width:29px;height:29px}.closing h2{font-size:20px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.primary-link{transition:none}.primary-link:hover{transform:none}}
@media print{.page-header,.page-footer,.primary-link,.hero-art{display:none}.wrap{width:100%}.hero,.letter,.play-together{display:block;padding:20px 0}.letter-mark{display:none}body{background:white}.questions details>div{display:block}.questions{padding-block:20px}.closing{padding-block:20px}}