*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}:root{--color-ink:#2A2017;--color-gold:#C9A96A;--font-sans:'Noto Sans JP', 'Hiragino Sans', system-ui, sans-serif;--font-serif:'Noto Serif JP', 'Hiragino Mincho Pro', Georgia, serif}body{font-family:var(--font-sans);background:var(--bg,#FFFDF8);color:var(--text,#2A2017);min-height:100dvh;display:flex;flex-direction:column}a{color:inherit;text-decoration:none}button{font-family:inherit}.container{max-width:980px;margin:0 auto;padding:0 1.25rem}.site-header{position:sticky;top:0;z-index:100;background:var(--header-bg,rgba(255,253,248,.92));backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--border,rgba(0,0,0,8%));transition:box-shadow .2s}.site-header.scrolled{box-shadow:0 2px 16px rgba(42,32,23,.1)}.header-inner{display:flex;align-items:center;justify-content:space-between;height:56px}.site-brand{font-family:var(--font-serif);font-size:1.1rem;font-weight:700;color:var(--accent-dark,var(--color-ink));letter-spacing:.02em;display:flex;align-items:center;gap:6px}.theme-toggle{display:inline-flex;border:1px solid var(--border,rgba(0,0,0,.12));border-radius:24px;overflow:hidden;background:var(--bg-surface,#fff)}.theme-btn{padding:6px 14px;font-size:.82rem;font-weight:600;border:none;background:0 0;color:var(--text-muted,#666);cursor:pointer;transition:all .18s;white-space:nowrap}.theme-btn.active{background:var(--accent,#C9A96A);color:#fff;border-radius:24px}.theme-btn:not(.active):hover{background:var(--bg-hover,#f0ece4);color:var(--text,#2A2017)}.sakura-btn{width:36px;height:36px;border-radius:50%;border:1px solid var(--border,rgba(0,0,0,.12));background:var(--bg-surface,#fff);font-size:1rem;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .18s}.sakura-btn.active,.sakura-btn:hover{background:#ffe4ec;border-color:#f9a8b8}.main-content{flex:1;padding:1.5rem 0 2.5rem}.site-footer{border-top:1px solid var(--border,rgba(0,0,0,8%));padding:1rem 0;font-size:.8rem;color:var(--text-muted,#888);text-align:center;background:var(--header-bg,#f8f4ee)}