:root{--bg: #f5f5f3;--card: #ffffff;--border: #dedcd6;--border-strong: #c9c6be;--text: #1f2328;--text-muted: #5b616b;--text-faint: #7a808a;--accent: #2f5f9e;--accent-hover: #264f85;--accent-soft: color-mix(in srgb, var(--accent) 9%, transparent);--on-accent: #ffffff;--input: #ffffff;--note: #f1f3f6;--warn-bg: #fff6d9;--warn-text: #6b5200;--error-bg: #fdecea;--error-text: #a3261b;--ok-bg: #e8f5ec;--ok-text: #1d6b37;--focus: color-mix(in srgb, var(--accent) 45%, transparent);--radius: 12px;--font: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic UI", "Meiryo", system-ui, sans-serif;--mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;color-scheme:light}@media(prefers-color-scheme:dark){:root{--bg: #15171c;--card: #1c1f25;--border: #2d333d;--border-strong: #3c4656;--text: #d7dce3;--text-muted: #a5adba;--text-faint: #8b96a6;--accent: #7ea6dc;--accent-hover: #93b6e6;--on-accent: #0f1726;--input: #15181d;--note: #20252d;--warn-bg: #3a3220;--warn-text: #f0d68a;--error-bg: #3b2224;--error-text: #ffaba3;--ok-bg: #1d3325;--ok-text: #9fe0b2;color-scheme:dark}}*{box-sizing:border-box}html,body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font);font-size:16px;line-height:1.7;-webkit-text-size-adjust:100%}.f-page{min-height:100vh;display:flex;flex-direction:column}.f-header{border-bottom:1px solid var(--border);background:var(--card)}.f-brand{max-width:680px;margin:0 auto;padding:14px 16px;font-weight:700;letter-spacing:.02em}.f-main{flex:1;width:100%;max-width:680px;margin:0 auto;padding:24px 16px 48px}.f-footer{text-align:center;color:var(--text-faint);font-size:13px;padding:16px}.f-title{font-size:24px;line-height:1.4;margin:0 0 8px}.f-lead{color:var(--text-muted);margin:0 0 20px}.f-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;margin-bottom:16px}.f-loading{color:var(--text-muted)}.f-h2{display:block;font-size:17px;font-weight:700;margin:0 0 12px;padding:0}fieldset{border:0;margin:0;padding:0;min-width:0}.f-field{margin-bottom:16px}.f-field:last-child{margin-bottom:0}.f-label{display:block;font-weight:600;font-size:15px;margin-bottom:6px;padding:0}.f-req{display:inline-block;font-size:11px;font-weight:700;line-height:1;padding:3px 6px;border-radius:999px;background:var(--accent-soft);color:var(--accent);vertical-align:2px;margin-left:4px}.f-hint{color:var(--text-muted);font-size:14px;margin:6px 0 0}.f-static{padding:10px 12px;background:var(--note);border-radius:8px}.f-input{display:block;width:100%;font:inherit;color:var(--text);background:var(--input);border:1px solid var(--border-strong);border-radius:8px;padding:10px 12px;min-height:44px}textarea.f-input{resize:vertical;line-height:1.6}select.f-input{appearance:none;background-image:linear-gradient(45deg,transparent 50%,var(--text-muted) 50%),linear-gradient(135deg,var(--text-muted) 50%,transparent 50%);background-position:calc(100% - 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