:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}#root{min-height:100vh}:root{--color-bg:#f5f7fb;--color-surface:#fff;--color-text:#1d2433;--color-text-muted:#6b7280;--color-border:#e3e8f0;--color-primary:#c8102e;--color-primary-dark:#9e0c24;--color-primary-soft:#fdeaed;--color-grammar:#8b5cf6;--color-grammar-soft:#f0eafe;--color-business:#0ea5a4;--color-business-soft:#e2f5f4;--color-success:#16a34a;--color-warning:#d97706;--color-danger:#dc2626;--heat-0:#ebedf0;--heat-1:#c6e7d4;--heat-2:#7bd0a0;--heat-3:#3aae73;--heat-4:#1b7a47;--space-1:4px;--space-2:8px;--space-3:12px;--space-4:16px;--space-5:24px;--space-6:32px;--radius-sm:6px;--radius-md:10px;--radius-lg:16px;--shadow-sm:0 1px 2px #1018280f;--shadow-md:0 4px 12px #10182814;--font-sans:-apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", "Segoe UI", Roboto, sans-serif}*{box-sizing:border-box}body{font-family:var(--font-sans);background:var(--color-bg);color:var(--color-text);-webkit-font-smoothing:antialiased;margin:0}button{cursor:pointer;font-family:inherit}.btn{border:1px solid var(--color-border);background:var(--color-surface);color:var(--color-text);padding:var(--space-3) var(--space-4);border-radius:var(--radius-md);font-size:15px;transition:background .15s,border-color .15s}.btn:hover{background:var(--color-bg)}.btn-primary{background:var(--color-primary);border-color:var(--color-primary);color:#fff}.btn-primary:hover{background:var(--color-primary-dark)}.btn-primary:disabled{opacity:.5;cursor:not-allowed}.card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);padding:var(--space-5)}.badge{border-radius:999px;padding:2px 8px;font-size:12px;font-weight:600;display:inline-block}.badge-grammar{background:var(--color-grammar-soft);color:var(--color-grammar)}.badge-business{background:var(--color-business-soft);color:var(--color-business)}.app-shell{max-width:760px;padding:var(--space-5) var(--space-4) var(--space-6);margin:0 auto}.exam-passage-layout{gap:var(--space-3);flex-direction:column;display:flex}.exam-passage-body{top:var(--space-2);z-index:1;max-height:45vh;box-shadow:var(--shadow-sm,0 2px 8px #00000014);margin-bottom:0;position:sticky;overflow-y:auto}.muted{color:var(--color-text-muted)}