:root{--cream:#fff8f3;--cream-strong:#f4e8f7;--cream-soft:#fffdfb;--teal:#7043b4;--teal-deep:#4b276e;--teal-soft:#946db8;--orange:#d84f8d;--orange-soft:#ed78aa;--ink:#2d2233;--ink-soft:#55485c;--ink-mute:#786b7d;--rule:#e2d2e5;--background:var(--cream);--surface:var(--cream-soft);--surface-strong:var(--cream-strong);--foreground:var(--ink);--foreground-soft:var(--ink-soft);--foreground-mute:var(--ink-mute);--rule-color:var(--rule);--accent:var(--orange);--accent-hover:var(--orange-soft);--headline:var(--teal);--spine:var(--teal);--spine-text:var(--cream);--font-serif:var(--font-cute),var(--font-noto-serif-jp),"Noto Serif JP","Hiragino Mincho ProN","Yu Mincho",Georgia,"Times New Roman",serif;--font-sans:var(--font-noto-sans-jp),"Noto Sans JP",-apple-system,BlinkMacSystemFont,"Hiragino Kaku Gothic ProN","Yu Gothic","Helvetica Neue",Arial,sans-serif;--font-mono:var(--font-roboto-mono),"Roboto Mono","SF Mono",Menlo,Consolas,"Courier 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22px;border-radius:var(--radius-md);border:none;font-family:var(--font-sans);font-size:13px;font-weight:600;letter-spacing:.02em;cursor:pointer;box-shadow:0 12px 28px rgba(112,67,180,.16);transition:background-color .2s ease,transform .2s ease,box-shadow .2s ease}.button:hover{background-color:var(--accent-hover);transform:translateY(-2px);box-shadow:0 16px 34px rgba(112,67,180,.22)}.button-ghost{display:inline-flex;align-items:center;gap:6px;background:transparent;color:var(--headline);padding:10px 0;border:none;border-bottom:1.5px solid;font-family:var(--font-sans);font-size:13px;font-weight:600;letter-spacing:.02em;cursor:pointer;transition:color .2s ease}.button-ghost:hover,.button-text{color:var(--accent)}.button-text{font-family:var(--font-sans);font-size:13px;font-weight:600;letter-spacing:.02em;transition:color .2s ease}.button-text:hover{color:var(--accent-hover)}.panel{background:var(--surface);border:1px solid var(--rule-color);border-radius:var(--radius-lg);padding:32px;transition:transform .2s ease,border-color .2s ease}.panel:hover{border-color:var(--teal);transform:translateY(-2px);box-shadow:var(--shadow-soft)}.spine-block{position:relative;padding-left:28px}.spine-block:before{content:"";position:absolute;left:0;top:0;bottom:0;width:var(--spine-width);background:var(--spine)}.rule{height:1px;background:var(--rule-color);border:0;margin:0}.grid-3{display:grid;grid-template-columns:repeat(3,1fr);grid-gap:24px;gap:24px}@media (max-width:768px){.grid-3{grid-template-columns:1fr;gap:20px}.title-large{font-size:36px;line-height:1.18}.title-medium{font-size:26px}.title-small{font-size:20px}.text-body{font-size:16px}}.book-series-section{margin-bottom:60px}.horizontal-scroll{display:flex;overflow-x:auto;gap:24px;padding-bottom:20px;scroll-snap-type:x mandatory;-webkit-overflow-scrolling:touch}.horizontal-scroll>*{flex:0 0 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