@import "https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@300;400;500;700&display=swap";.app{flex-direction:column;min-height:100vh;display:flex}.app-main{flex-direction:column;flex:1;display:flex}.app-header{z-index:100;border-bottom:1px solid var(--border);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);box-shadow:var(--shadow-sm);background:#fffffff2;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;padding:12px 24px;display:flex;position:sticky;top:0}.header-left{align-items:center;display:flex}.logo{align-items:center;gap:10px;text-decoration:none;display:flex}.logo:hover{text-decoration:none}.logo-badge{font-family:var(--font-sans);background:var(--primary);color:#fff;letter-spacing:.3px;border-radius:5px;padding:5px 9px;font-size:12px;font-weight:700}.logo-text{flex-direction:column;display:flex}.logo-title{font-family:var(--font-sans);color:var(--primary);letter-spacing:.3px;font-size:14px;font-weight:700}.logo-sub{font-family:var(--font-sans);color:var(--text-muted);letter-spacing:.5px;font-size:9px}.header-nav{gap:8px;display:flex}.nav-link{color:var(--text-secondary);border-radius:6px;padding:6px 12px;font-size:13px;transition:all .2s}.nav-link:hover{color:var(--primary);background:#2563ab0f;text-decoration:none}.header-right{align-items:center;gap:10px;display:flex}.user-menu{align-items:center;gap:12px;display:flex}.user-email{color:var(--text-muted);font-size:12px;font-family:var(--font-mono)}.auth-buttons{align-items:center;gap:8px;display:flex}.btn-primary{cursor:pointer;font-family:var(--font-sans);letter-spacing:.4px;background:var(--primary);color:#fff;border:none;border-radius:7px;padding:10px 22px;font-size:12px;font-weight:700;transition:all .18s}.btn-primary:hover:not(:disabled){opacity:.88}.btn-primary:disabled{opacity:.3;cursor:not-allowed}.btn-primary.full-width{width:100%}.btn-primary-sm{cursor:pointer;background:var(--primary);color:#fff;border:none;border-radius:6px;padding:6px 14px;font-size:12px;font-weight:600;transition:all .18s}.btn-primary-sm:hover{opacity:.88}.btn-ghost{border:1px solid var(--border);color:var(--text-muted);cursor:pointer;background:0 0;border-radius:6px;padding:6px 14px;font-size:12px;transition:all .18s}.btn-ghost:hover{border-color:var(--primary);color:var(--primary);text-decoration:none}.page-content{width:100%;max-width:880px;margin:0 auto;padding:24px 16px}.page-center{color:var(--text-muted);font-family:var(--font-sans);flex-direction:column;justify-content:center;align-items:center;gap:14px;padding:60px 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var(--border);box-shadow:var(--shadow-sm);cursor:pointer;text-align:left;width:100%;font-family:var(--font-sans);color:var(--text-primary);border-radius:12px;flex-direction:column;gap:12px;padding:24px;transition:all .2s;display:flex;position:relative;overflow:hidden}.exam-card:before{content:"";background:var(--primary);border-radius:12px 12px 0 0;height:3px;position:absolute;top:0;left:0;right:0}.exam-card:hover{border-color:var(--border-hover);background:var(--bg-card-hover);box-shadow:var(--shadow-md);transform:translateY(-1px)}.exam-card-top{justify-content:space-between;align-items:center;display:flex}.cert-badge{font-family:var(--font-sans);letter-spacing:.3px;border-radius:4px;padding:3px 10px;font-size:11px;font-weight:600}.exam-id{font-family:var(--font-mono);color:var(--text-muted);font-size:11px}.exam-name{color:var(--text-primary);font-size:18px;font-weight:600;line-height:1.4}.exam-domains{flex-direction:column;gap:4px;display:flex}.exam-domain-item{color:var(--text-secondary);justify-content:space-between;padding:2px 0;font-size:12px;display:flex}.exam-domain-weight{font-family:var(--font-mono);color:var(--accent);font-size:11px}.exam-domain-count{font-family:var(--font-mono);color:var(--text-muted);margin-top:4px;font-size:11px}.domain-selector{flex-wrap:wrap;gap:7px;margin-bottom:16px;display:flex}.domain-chip{border:1px solid var(--border);color:var(--text-muted);cursor:pointer;font-size:12px;font-family:var(--font-sans);background:0 0;border-radius:20px;align-items:center;gap:6px;padding:6px 14px;transition:all .2s;display:flex}.domain-chip:hover{color:#bb8000;border-color:#e67e2261}.domain-chip.active{color:var(--accent);background:#e67e2217;border-color:#e67e226b}.domain-weight{font-family:var(--font-mono);opacity:.7;font-size:10px}.study-page{max-width:860px}.study-header{margin-bottom:16px}.study-title{color:var(--text-primary);margin-bottom:12px;font-size:22px;font-weight:700}.study-topbar{border:1px solid var(--border);font-family:var(--font-sans);background:#ffffff05;border-radius:8px;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px;margin-bottom:14px;padding:8px 14px;font-size:12px;display:flex}.topbar-left{color:var(--text-muted)}.topbar-left strong{color:var(--accent)}.topbar-rate{color:var(--text-secondary)}.topbar-right{align-items:center;gap:9px;display:flex}.type-badge{font-family:var(--font-mono);letter-spacing:.3px;border-radius:4px;padding:3px 10px;font-size:10px}.type-badge.single{color:var(--primary);background:#2563ab12;border:1px solid #2563ab2e}.type-badge.multi{color:var(--accent);background:#e67e2212;border:1px solid #e67e222e}.btn-quit{color:var(--text-muted);cursor:pointer;background:0 0;border:1px solid #dc262633;border-radius:5px;padding:4px 12px;font-size:11px;transition:all .15s}.btn-quit:hover{color:var(--danger);background:#dc26260f;border-color:#dc262680}.question-card{background:var(--bg-card);border:1px solid var(--border);box-shadow:var(--shadow-sm);border-radius:13px;margin-bottom:16px;padding:24px;position:relative;overflow:hidden}.question-card:before{content:"";background:var(--primary);border-radius:12px 12px 0 0;height:3px;position:absolute;top:0;left:0;right:0}.question-meta{flex-wrap:wrap;align-items:center;gap:7px;margin-bottom:12px;display:flex}.badge{font-family:var(--font-mono);letter-spacing:.3px;border-radius:4px;padding:2px 9px;font-size:10px}.badge-domain{color:var(--accent);background:#e67e2214;border:1px solid #e67e2229}.badge-hard{color:var(--danger);background:#dc262614;border:1px solid #dc262629}.badge-medium{color:#fa3;background:#e67e2214;border:1px solid #e67e2229}.badge-easy{color:var(--success);background:#16a34a14;border:1px solid #16a34a29}.question-num{font-family:var(--font-mono);color:var(--text-muted);margin-left:auto;font-size:11px}.multi-hint{font-family:var(--font-sans);color:var(--accent);background:#e67e220d;border:1px solid #e67e2224;border-radius:6px;margin-bottom:12px;padding:7px 12px;font-size:12px}.question-text{color:var(--text-primary);white-space:pre-wrap;font-size:14.5px;line-height:1.94}.options-list{flex-direction:column;gap:7px;margin-bottom:18px;display:flex}.option{border:1px solid var(--border);cursor:pointer;text-align:left;width:100%;font-family:var(--font-sans);color:var(--text-primary);background:#ffffff04;border-radius:8px;align-items:flex-start;gap:11px;padding:12px 14px;font-size:13.5px;transition:all 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