:root{--color-bg-base: #f5f2eb;--color-bg-surface: #fffdf8;--color-bg-elevated: #ffffff;--color-ink-primary: #2a2a2a;--color-ink-secondary: #5e5c58;--color-ink-muted: #8a8780;--color-border-subtle: #e3ddd4;--color-border-strong: #c9c3b8;--color-accent-link: #4a5d6a;--color-semantic-danger: #b42318;--color-semantic-success: #1f6f54;--color-cta-bg: #2a2a2a;--color-cta-bg-hover: #1a1a1a;--color-cta-text: #ffffff;--radius-md: 12px;--shadow-soft: 0 1px 3px rgba(42, 42, 42, .08);--font-sans: "Noto Sans JP", "Hiragino Sans", "Hiragino Kaku Gothic ProN", Meiryo, system-ui, sans-serif;--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-6: 24px;--space-8: 32px}*,*:before,*:after{box-sizing:border-box}html{font-size:16px;-webkit-text-size-adjust:100%}body{margin:0;min-height:100dvh;font-family:var(--font-sans);line-height:1.6;color:var(--color-ink-primary);background:var(--color-bg-base)}a{color:var(--color-accent-link);text-decoration:none}a:hover{text-decoration:underline}img{max-width:100%;height:auto;vertical-align:middle}button,input,textarea,select{font:inherit}.app-shell{min-height:100dvh;display:flex;flex-direction:column}.app-main{flex:1;width:100%;max-width:42rem;margin:0 auto;padding:var(--space-4);padding-bottom:var(--space-8)}.app-header{position:sticky;top:0;z-index:10;display:flex;align-items:center;justify-content:space-between;gap:var(--space-3);padding:var(--space-3) var(--space-4);background:var(--color-bg-surface);border-bottom:1px solid var(--color-border-subtle);box-shadow:var(--shadow-soft)}.app-header__brand{display:flex;align-items:center;gap:var(--space-2);font-weight:600;color:var(--color-ink-primary)}.app-header__brand img{height:36px;width:auto}.app-footer{margin-top:auto;padding:var(--space-6) var(--space-4);border-top:1px solid var(--color-border-subtle);background:var(--color-bg-surface);font-size:.875rem;color:var(--color-ink-secondary)}.app-footer__links{display:flex;flex-wrap:wrap;gap:var(--space-3);justify-content:center;max-width:42rem;margin:0 auto}.card{background:var(--color-bg-surface);border:1px solid var(--color-border-subtle);border-radius:var(--radius-md);padding:var(--space-4);box-shadow:var(--shadow-soft)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);padding:var(--space-3) var(--space-4);border-radius:var(--radius-md);border:1px solid transparent;font-weight:600;cursor:pointer;transition:background .2s ease}.btn:disabled{opacity:.55;cursor:not-allowed}.btn--primary{background:var(--color-cta-bg);color:var(--color-cta-text)}.btn--primary:hover:not(:disabled){background:var(--color-cta-bg-hover)}.btn--secondary{background:var(--color-bg-elevated);color:var(--color-ink-primary);border-color:var(--color-border-strong)}.field{display:flex;flex-direction:column;gap:var(--space-1);margin-bottom:var(--space-4)}.field label{font-size:.875rem;color:var(--color-ink-secondary)}.field input[type=text],.field input[type=email],.field input[type=password],.field textarea{width:100%;padding:var(--space-3);border:1px solid var(--color-border-subtle);border-radius:var(--radius-md);background:var(--color-bg-elevated)}.field textarea{min-height:6rem;resize:vertical}.muted{color:var(--color-ink-secondary);font-size:.875rem}.error-banner{padding:var(--space-3);border-radius:var(--radius-md);background:#fde8e6;color:var(--color-semantic-danger);margin-bottom:var(--space-4);font-size:.875rem}.grid-thumbs{display:grid;grid-template-columns:repeat(auto-fill,minmax(96px,1fr));gap:var(--space-2)}.thumb{aspect-ratio:1;border-radius:var(--radius-md);overflow:hidden;border:1px solid var(--color-border-subtle);background:var(--color-bg-elevated)}.thumb img{width:100%;height:100%;object-fit:cover}.stack{display:flex;flex-direction:column;gap:var(--space-3)}.h1{font-size:1.35rem;font-weight:700;margin:0 0 var(--space-3)}.h2{font-size:1.1rem;font-weight:600;margin:var(--space-6) 0 var(--space-2)}