:root{--color-bg: #FAF8F5;--color-surface: #FFFFFF;--color-text: #1A1A1A;--color-text-muted: #5C5650;--color-text-soft: #8A847C;--color-text-hint: #A8A095;--color-accent: #C8553D;--color-accent-soft: #FCEEEA;--color-border: #E5E0D8;--color-border-strong: #D0CCC5;--color-zone-again: #A03525;--color-zone-hard: #B8862D;--color-zone-good: #5C7A5C;--color-zone-easy: #466B85;--color-zone-neutral: #BFB7AB;--zone-again-bg: #F2D5CC;--zone-hard-bg: #F5E9D7;--zone-good-bg: #DCE9DC;--zone-easy-bg: #C8E0E5;--font-en-serif: "Georgia", "Iowan Old Style", "Noto Serif", serif;--font-jp-sans: "Hiragino Sans", "Noto Sans JP", system-ui, -apple-system, sans-serif;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .04);--shadow-md: 0 2px 8px rgba(0, 0, 0, .04);--shadow-lg: 0 4px 16px rgba(0, 0, 0, .06);--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-5: 24px;--space-6: 32px;--space-7: 48px}*{box-sizing:border-box}html,body,#root{margin:0;padding:0;height:100%;background:var(--color-bg);color:var(--color-text);font-family:var(--font-jp-sans);-webkit-font-smoothing:antialiased;overscroll-behavior:none}body{touch-action:manipulation}button{font-family:inherit;cursor:pointer}a{color:var(--color-accent);text-decoration:none}a:hover{text-decoration:underline}.app-shell{max-width:720px;margin:0 auto;padding:var(--space-5) var(--space-4) calc(var(--space-7) + 60px);min-height:100%}.page-title{font-size:22px;font-weight:600;margin:0 0 var(--space-4);letter-spacing:-.01em}.muted{color:var(--color-text-muted)}.soft{color:var(--color-text-soft)}.hint{color:var(--color-text-hint)}.section-label{font-size:11px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--color-text-soft)}.card-tile{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:18px;box-shadow:var(--shadow-md);display:block;width:100%;text-align:left;color:inherit;margin-bottom:var(--space-3)}.card-tile h3{margin:0 0 var(--space-1);font-size:17px;font-weight:600}.card-tile p{margin:0;font-size:13px;color:var(--color-text-muted)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);border:none;background:var(--color-accent);color:#fff;padding:14px 18px;border-radius:var(--radius-md);font-size:15px;font-weight:600;box-shadow:var(--shadow-sm)}.btn[disabled]{opacity:.5}.btn-secondary{background:var(--color-surface);color:var(--color-text);border:1px solid var(--color-border);box-shadow:none}.btn-ghost{background:transparent;color:var(--color-accent);border:none;box-shadow:none;padding:8px 12px}.btn-danger{background:#b33a2a}.form-row{display:flex;flex-direction:column;gap:var(--space-2);margin-bottom:var(--space-4)}.form-row label{font-size:13px;color:var(--color-text-muted)}.form-row input,.form-row textarea{font-family:inherit;font-size:15px;padding:12px 14px;border:1px solid var(--color-border);border-radius:var(--radius-sm);background:var(--color-surface);color:var(--color-text);outline:none;transition:border-color .12s ease}.form-row input:focus,.form-row textarea:focus{border-color:var(--color-accent)}.form-row textarea{min-height:140px;resize:vertical}.tab-bar{position:fixed;bottom:0;left:0;right:0;background:var(--color-surface);border-top:1px solid var(--color-border);display:flex;justify-content:space-around;align-items:stretch;padding:6px 0 calc(6px + env(safe-area-inset-bottom));z-index:50}.tab-bar a{flex:1;text-align:center;font-size:12px;padding:8px 4px;color:var(--color-text-soft);text-decoration:none;font-weight:500}.tab-bar a.active{color:var(--color-accent);font-weight:600}