:root{--color-bg: #fafaf9;--color-bg-sunken: #f1f1f0;--color-surface: #ffffff;--color-text: #141517;--color-text-muted: #54575d;--color-text-faint: #6d7178;--color-border: #e0e1e3;--color-border-strong: #b9bcc1;--color-accent: #ff6b4a;--color-accent-hover: #ff8466;--color-accent-text: #c8381a;--color-streak-done: var(--color-accent-text);--color-on-accent: #1f2a44;--color-inverse-bg: #141517;--color-inverse-surface: #25272b;--color-inverse-text: #f4f4f5;--color-inverse-muted: #a3a6ad;--color-focus: #c8381a;--color-danger: #a6261b;--color-danger-solid: #a6261b;--color-on-danger: #ffffff;--color-overlay: rgb(20 21 23 / .55);--color-highlight: #ececea;--font-sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;--font-mono: "IBM Plex Mono", ui-monospace, Consolas, monospace;--radius: 4px;--shadow-raised: 0 8px 24px rgb(20 21 23 / .1);--page-width: 1180px;--gutter: clamp(16px, 4vw, 48px);--card-font-serif: "Playfair Display", Georgia, "Times New Roman", 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#9aa3c0;--color-text-faint: #8e97b6;--color-border: #2a3558;--color-border-strong: #5b6892;--color-accent-text: #ff8466;--color-streak-done: var(--color-accent);--color-inverse-bg: #171e36;--color-inverse-surface: #2a3558;--color-inverse-text: #f4f1e8;--color-inverse-muted: #9aa3c0;--color-focus: #ff8466;--color-danger: #ff8a7a;--color-danger-solid: #c93c2f;--color-overlay: rgb(5 8 18 / .72);--color-highlight: #222b4a;--shadow-raised: 0 8px 24px rgb(0 0 0 / .5);--brand-ink: #f4f1e8;color-scheme:dark}:root:lang(ja){--font-sans: "IBM Plex Sans", system-ui, "Hiragino Sans", "Yu Gothic UI", "Meiryo", "Noto Sans CJK JP", sans-serif}:root:lang(ko){--font-sans: "IBM Plex Sans", system-ui, "Apple SD Gothic Neo", "Malgun Gothic", "Noto Sans CJK KR", sans-serif;word-break:keep-all}:root:lang(zh-Hans){--font-sans: "IBM Plex Sans", system-ui, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif}:root:lang(zh-Hant){--font-sans: "IBM Plex Sans", system-ui, "PingFang TC", "Microsoft 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20px;border:1px solid var(--color-border-strong);border-radius:var(--radius);background:var(--color-surface);color:var(--color-text);font:500 14px/1 var(--font-sans);text-decoration:none;cursor:pointer;transition:background .15s,color .15s,border-color .15s}.btn:hover{background:var(--color-bg-sunken)}.btn-primary,.btn-accent{border-color:var(--color-accent);background:var(--color-accent);color:var(--color-on-accent)}.btn-primary:hover,.btn-accent:hover{border-color:var(--color-accent-hover);background:var(--color-accent-hover)}.btn-small{min-height:34px;padding:0 14px;font-size:13px}.btn:disabled{opacity:.5;cursor:not-allowed}.chip{display:inline-flex;align-items:center;gap:8px;min-height:34px;padding:0 14px;border:1px solid var(--color-border);border-radius:999px;background:var(--color-surface);color:var(--color-text);font:500 13px/1 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