:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --success: #22c55e;
    --danger: #ef4444;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-500: #6b7280;
    --gray-700: #374151;
    --gray-900: #111827;
    --radius: 12px;
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Noto Sans JP', sans-serif; background: var(--gray-50); color: var(--gray-900); }
.container { max-width: 1400px; margin: 0 auto; padding: 24px; }
.header { margin-bottom: 24px; }
.header h1 { font-size: 28px; font-weight: 700; display: flex; align-items: center; gap: 12px; }
.header p { color: var(--gray-500); margin-top: 4px; }
.spin-badge { background: linear-gradient(135deg, #8b5cf6, #6366f1); color: white; font-size: 12px; padding: 4px 10px; border-radius: 20px; font-weight: 600; }

.tabs { display: flex; gap: 4px; background: white; padding: 6px; border-radius: var(--radius); margin-bottom: 24px; box-shadow: var(--shadow); overflow-x: auto; }
.tab { padding: 12px 20px; border: none; background: transparent; border-radius: 8px; cursor: pointer; font-size: 14px; font-weight: 500; color: var(--gray-500); transition: all 0.2s; white-space: nowrap; }
.tab:hover { background: var(--gray-100); color: var(--gray-700); }
.tab.active { background: var(--primary); color: white; }

.dashboard-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; margin-bottom: 24px; }
.stat-card { background: white; border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); }
.stat-card h3 { font-size: 13px; color: var(--gray-500); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 8px; }
.stat-card .value { font-size: 32px; font-weight: 700; color: var(--gray-900); }

.section { background: white; border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); margin-bottom: 24px; }
.section-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }
.section h2 { font-size: 18px; font-weight: 600; }

.btn { padding: 10px 20px; border: none; border-radius: 8px; font-size: 14px; font-weight: 500; cursor: pointer; transition: all 0.2s; display: inline-flex; align-items: center; gap: 8px; }
.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-secondary { background: var(--gray-100); color: var(--gray-700); }
.btn-danger { background: var(--danger); color: white; }
.btn-sm { padding: 6px 12px; font-size: 13px; }

.table-container { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 14px 16px; text-align: left; border-bottom: 1px solid var(--gray-200); }
th { font-size: 12px; font-weight: 600; color: var(--gray-500); text-transform: uppercase; background: var(--gray-50); }
tr:hover { background: var(--gray-50); }

.status { display: inline-block; padding: 4px 10px; border-radius: 20px; font-size: 12px; font-weight: 500; }
.status-new { background: #dbeafe; color: #1e40af; }
.status-contacted { background: #fef3c7; color: #92400e; }
.status-qualified { background: #d1fae5; color: #065f46; }
.status-converted { background: #c7d2fe; color: #3730a3; }
.status-lost { background: #fee2e2; color: #991b1b; }

.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 13px; font-weight: 500; color: var(--gray-700); margin-bottom: 6px; }
.form-group input, .form-group select { width: 100%; padding: 10px 14px; border: 1px solid var(--gray-300); border-radius: 8px; font-size: 14px; }
.form-group input:focus, .form-group select:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37,99,235,0.1); }

.modal { display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.5); z-index: 1000; align-items: center; justify-content: center; }
.modal.open { display: flex; }
.modal-content { background: white; border-radius: var(--radius); padding: 24px; width: 90%; max-width: 500px; max-height: 90vh; overflow-y: auto; }
.modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }
.modal-header h3 { font-size: 18px; font-weight: 600; }
.modal-close { background: none; border: none; font-size: 24px; cursor: pointer; color: var(--gray-500); }
.modal-footer { display: flex; justify-content: flex-end; gap: 12px; margin-top: 24px; }

.empty-state { text-align: center; padding: 60px 20px; color: var(--gray-500); }
.empty-state .icon { font-size: 48px; margin-bottom: 16px; }
.loading { text-align: center; padding: 40px; color: var(--gray-500); }
.spinner { width: 40px; height: 40px; border: 3px solid var(--gray-200); border-top-color: var(--primary); border-radius: 50%; animation: spin 1s linear infinite; margin: 0 auto 16px; }
@keyframes spin { to { transform: rotate(360deg); } }

@media (max-width: 768px) {
    .container { padding: 16px; }
    .tab { padding: 10px 14px; font-size: 13px; }
    .dashboard-grid { grid-template-columns: 1fr 1fr; }
}